Method for determining operating conditions for deodorizing equipment

Abstract

To provide a measurement unit which can be attached to a deodorization device that effectively deodorizes odorous gas including an odorous component.SOLUTION: A measurement unit 50 can be attached to a deodorization device 100 which measures concentration of an odorous component and records a temporal change thereof and includes a housing 51 which has a power connector 52 and detector connectors 53a, 53b. Inside the housing, DC power supplies DC1, DC2, detector control circuits CTL1, CTL2, and a data logger DL are provided. The DC power supplies convert AC power supplied via the power connector into DC power and supply it to the detector control circuits. The detector control circuits supply power to detectors connected via the detector connectors, receive signals from the detectors, and output the signals to the data logger. The data logger records the signals input from the detector control circuits as data.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a deodorizing device for treating gas containing odorous components generated in, for example, a human waste treatment plant, a sewage treatment plant, etc. How to determine operating conditions Regarding. [Background technology]

[0002] Gases generated in sewage treatment plants, sewage treatment plants, etc. generally contain sulfur-based odorous components such as ammonia, hydrogen sulfide, methyl mercaptan, methyl sulfide, methyl disulfide, etc. One type of deodorizing equipment that treats gases containing odorous components (hereinafter sometimes referred to as odorous gases) is a wet deodorizing equipment that removes the odorous components by reacting a chemical liquid circulating in a deodorizing tower with the odorous components in the gas.

[0003] In conventional wet deodorizing devices, the reaction products of the odorous components in the gas and the chemical solution can accumulate as "salts" and deposits inside the device over long periods of operation. This requires periodic replacement of at least a portion of the chemical solution. Meanwhile, the concentration of odorous components in the gas is generally not constant over time, but rather varies, for example, depending on the season or time of day. Therefore, deodorizing devices are operated under fixed deodorizing conditions, particularly the conditions for circulating the chemical solution, that allow deodorization of gas containing the maximum anticipated concentration of odorous components. In order to determine the frequency of periodic replacement and the specifications of replacement parts, it is common to measure the change in the concentration of odorous components over time, record the measured values ​​in a recording device (data logger), and analyze the trends in the fluctuations in the concentration of odorous components over the seasons and time periods.In this case, the data recorded in the data logger is collected and analyzed after a relatively long period of operation, for example, one month, depending on the amount of data.

[0004] Meanwhile, there is known a technology for controlling the circulation amount of chemical solution in response to fluctuations in the concentration of odorous components in the gas. For example, Patent Document 1 discloses a deodorizing device that monitors (measures) the concentration of odorous components contained in the gas to be treated at intervals of 15 to 60 minutes, and adjusts the "supply amount of nano-mist" generated by the atomization unit 15 according to the odor intensity (concentration). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-168726 [Patent Document 2] Japanese Patent Application Laid-Open No. 2008-36513 [Patent Document 3] Japanese Patent Application Publication No. 2019-72691 Summary of the Invention [Problem to be solved by the invention]

[0006] However, while it is possible to reduce the amount of excess chemical used during normal operation by monitoring the concentration of the chemical at regular intervals and controlling the "supply amount," it is not possible to prevent a decrease in deodorizing efficiency that occurs when the deodorizing effect (removal effect) deteriorates over time as odorous components are removed. Also, increasing the frequency of maintenance in order to restore the deodorizing effect is economically inefficient.

[0007] The present invention provides Provides a method for determining the appropriate operating conditions for existing deodorization equipment The main purpose is to and do. [Means for solving the problem]

[0008] The deodorizing device according to the present invention comprises: a deodorization tower for mixing the odorous gas with a chemical solution; A chemical solution discharge unit installed inside the deodorization tower; a detector for measuring the concentration of odorous components contained in the odorous gas flowing into the deodorization tower; a chemical solution supplying device that supplies the chemical solution to the chemical solution discharging portion; a chemical solution discharge device that discharges the chemical solution to the outside; a control device for controlling the chemical solution supply device and the chemical solution discharge device, The control device The amount of chemical solution discharged is controlled based on the concentration of odorous components output by the detector.

[0009] As described above, by measuring the "odor component concentration" in real time and controlling the "odor component concentration" in relation to the "chemical discharge amount," the discharge amount of the chemical is reduced when the odor component concentration is low, and conversely, when the odor component concentration is high, the chemical discharge amount is adjusted to the concentration. Therefore, the chemical circulating within the device is replaced in response to changes in odor component concentration while the deodorizer is in operation, and the accumulation of reaction products is reduced throughout the device, even when the device is operated for extended periods. Furthermore, for daily operation, setting the cycle for measuring the chemical concentration (sampling cycle) to a short cycle improves responsiveness to sudden increases in odor component concentration, minimizes chemical loss, and reduces the running costs of the chemical. Note that "discharged to the outside" means discharged outside the deodorizer system.

[0010] The deodorizing device may be configured such that the concentration of the odor component is an integrated value of the concentration over a predetermined period of time.

[0011] This is because the influence of odorous components on the deodorizing device is not the current concentration indicated by the measuring device, but appears as an integrated value that is the sum of past concentrations. This tendency is thought to be particularly pronounced when there is an accumulation of reaction products, etc.

[0012] With this type of deodorizing device, the chemical solution is partially discharged based on the integrated value of the concentration of odorous components, which reduces the concentration of ``salt'' that may be generated by the reaction between the odorous gas and the chemical solution, making it possible to maintain the effect of reducing the decline in the deodorizing efficiency of the chemical solution for a long period of time.

[0013] Further, the deodorizing device according to the present invention comprises: The flow rate of the chemical solution to the chemical solution discharge portion is controlled based on the concentration of the odor component output by the detector.

[0014] In this way, by controlling the flow rate of the chemical solution to the chemical solution release section in accordance with changes in the concentration of odorous components, it is possible to provide a deodorizing device that can deodorize more efficiently. For example, there is an advantage in that the flow rate circulating within the deodorizing device can be temporarily increased or decreased depending on the concentration of odorous components.

[0015] In the above configuration, the deodorizing device The reaction module further includes a filling section provided with a filler, and the filling section and the chemical solution discharge section constitute a reaction module. A plurality of the reaction modules are provided inside the deodorization tower, The control device is characterized in that it controls the flow rate of the chemical liquid to each of the chemical liquid release portions based on the concentration of the odor component output by the detector.

[0016] With this configuration, it is no longer necessary to constantly keep the concentration of chemical components (which varies depending on the odor component, but for example, sodium hypochlorite for sulfur-based odor components) in the circulating chemical solution high in consideration of deterioration of the chemical solution, thereby reducing the running costs of the chemicals.

[0017] With this configuration, the supply flow rate of the chemical solution flowing into each chemical solution discharge section in the reaction modules arranged in multiple stages within the deodorization tower can be adjusted according to the concentration of odorous components, thereby improving responsiveness to sudden increases in the concentration of odorous components, and enabling efficient use of the chemical solution, thereby reducing the running costs of the chemical solution.

[0018] Further, the deodorizing device according to the present invention comprises: The detector measures the concentration of odor components at a predetermined sampling period, The control device is characterized in that it integrates the concentration of the odor component output by the detector at a time interval longer than the sampling period.

[0019] With this configuration, it is possible to provide a deodorizing device that can respond immediately to changes in the concentration of odorous components, prevent excessive loss of chemical solution, and efficiently deodorize odorous gases.

[0020] Further, the deodorizing device according to the present invention comprises: a chemical component supply device for supplying chemical components to the chemical solution; the control device controls the drug component supply device; The amount of the chemical component to be supplied to the chemical solution is controlled based on the concentration of the odor component output from the detector.

[0021] Further, the deodorizing device according to the present invention comprises: The chemical component is sodium hypochlorite, and the chemical component supply device includes an electrolytic cell.

[0022] With this configuration, the amount of chemical component supplied to the chemical solution can be changed in response to changes in the concentration of odor components, making it possible to supply a chemical solution with an appropriate deodorizing effect. Furthermore, when sodium hypochlorite is used as the chemical component, it is also possible to generate sodium hypochlorite using an electrolytic cell, and in such a configuration, the controllability of the amount of sodium hypochlorite supplied can be improved.

[0023] The deodorizing method according to the present invention comprises: This is a deodorization method in which odorous gas containing odorous components is deodorized by reacting it with a chemical solution in a deodorization tower. a step of measuring the concentration of odorous components contained in the odorous gas flowing into the deodorization tower with a detector; The amount of chemical solution discharged from the deodorization tower is controlled based on the concentration of the odorous components.

[0024] Further, the deodorizing method according to the present invention comprises: The method further comprises a step of controlling the flow rate of the chemical solution discharged into the deodorization tower based on the concentration of the odorous components measured by the detector.

[0025] Further, the deodorizing method according to the present invention comprises: The method further includes a step of controlling the amount of sodium hypochlorite to be supplied to the chemical solution based on the concentration of the odorous component measured by the detector.

[0026] This deodorizing method allows deodorizing treatment to be performed under appropriate conditions according to the concentration of odorous components, and also reduces the deterioration of the deodorizing effect of the chemical solution. It also reduces the cost of deodorizing odorous gases and the workload of operators.

[0027] Further, the deodorizing method according to the present invention comprises: The reaction module further includes a filling section provided with a filler, and the filling section and the chemical solution discharge section constitute a reaction module. A plurality of the reaction modules are provided inside the deodorization tower, The method is characterized by including a step of supplying the chemical solution to the chemical solution discharge portion of the reaction module selected based on the concentration of the odor component measured by the detector.

[0028] Further, the deodorizing method according to the present invention comprises: A deodorizing method comprising the step of controlling the flow rate of the chemical solution discharged from the chemical solution discharge portion within a geometrically optimum flow rate range.

[0029] By adopting such a deodorizing method, the efficiency of use of the chemical solution used to deodorize the odorous gas can be improved, thereby improving the deodorizing efficiency.

[0030] The measurement unit according to the present invention is a measurement unit that can be attached to a deodorizing device for measuring the concentration of odor components and recording the change over time, a housing having a power connector and a detector connector; The housing contains a DC power supply, a detector control circuit, and a data logger, the DC power supply converts AC power supplied via the power supply connector into DC power and supplies the DC power to the detector control circuit; the detector control circuit supplies power to the detector connected via the detector connector, receives a signal from the detector, and outputs the signal to the data logger; The data logger is characterized in that it records the signal input from the detector control circuit as data.

[0031] The measuring unit according to the present invention also includes: the housing has a window; the measuring unit has a display device; The display device is capable of displaying the data, and is characterized in that the display device is visible through the window.

[0032] The measuring unit according to the present invention also includes: the housing has a main body and a lid supported on the main body so as to be openable and closable; the window is provided in the lid portion, The main body is characterized in that the power supply connector and the detector connector are provided on the main body.

[0033] By connecting such a measurement unit to the detector of a deodorizing device, it becomes possible to easily measure the change over time in the concentration of odor components in gas G. This makes it possible to use the measurement unit for the maintenance, status diagnosis, performance comparison, optimization of deodorizing conditions, and detector calibration of various deodorizing devices, as well as to estimate in advance the effect of installing the control function of the present invention in a deodorizing device that does not have the control function of the present invention. Furthermore, by applying the concepts of the deodorizing device, deodorizing method, and measurement unit described above, it is possible to provide a method for determining optimal operating conditions for an existing deodorizing device. That is, the method for determining operating conditions for a deodorizing device according to the present invention measures the inlet concentration of odorous components flowing into the deodorizing device, records the change over time, and determines the operating conditions for the deodorizing device based on a preset threshold value for the change over time in the concentration of chemical components used for deodorization in the deodorizing device. . In the above configuration, the measurement and the recording may both be performed by a portable measurement unit. The inlet concentration may be any one of a real-time concentration, an integrated value, and an average value over a predetermined period. Furthermore, the operating condition may be a flow rate of the chemical solution component. [Effects of the Invention]

[0034] The deodorizing device and deodorizing method using the same of the present invention make it possible to reduce the decline in deodorizing efficiency over a long period of time, and also to efficiently deodorize odorous gases whose concentrations of odor components change. Furthermore, according to the method for determining the operating conditions of a deodorizing device of the present invention, it is possible to provide optimal operating conditions for an existing deodorizing device, and once the operating conditions are determined, it is also possible to propose the control devices, etc. required for those conditions. [Brief explanation of the drawings]

[0035] [Figure 1] 1 is a schematic diagram showing the main configuration of a deodorizing device. [Figure 2] FIG. 2 is a schematic diagram showing an example of the configuration of a sodium hypochlorite supply device of a deodorizing device. [Figure 3] Graph showing the change over time (daily change) in the concentration of odorous components contained in gas G. [Figure 4] 6 is a graph showing changes in the flow rate of the chemical solution circulating inside the deodorization tower and the amount of the chemical solution discharged to the outside of the deodorization tower. [Figure 5] 6 is a graph showing changes in the chemical component concentration of chemical solution 5 circulating inside the deodorization tower, the odor component concentration of gas G, and the discharge amount (flow rate) of chemical solution discharged outside the deodorization tower. [Figure 6] 4 is a graph showing an example of fluctuation in the concentration of odorous components contained in gas G. [Figure 7] FIG. 10 is a conceptual diagram showing the main configuration of a deodorizing device 100 according to a second embodiment. [Figure 8] Figure 8(a) is a graph showing the distribution of drug component concentrations in one filling section 6, and Figure 8(b) is a graph showing the distribution of drug component concentrations in two filling sections consisting of a first filling section 6a and a second filling section 6b. [Figure 9] 9(a), (b), and (c) show the dependency of the release angle of the liquid medicine 5 released from the liquid medicine release portion 4 on the flow rate of the liquid medicine 5, with the release amount of the liquid medicine 5 increasing in the order of FIGS. 9(a), (b), and (c). [Figure 10] 10(a) and 10(b) are a perspective view and a cross-sectional view, respectively, that schematically show the release distribution of the drug solution 5 from the drug solution releasing portion 4 and the geometric relationship with the cylindrical filling portion 6. FIG. [Figure 11] 1 is a schematic diagram showing a configuration for a performance comparison experiment between a deodorizing device 100 and a conventional deodorizing device 99. FIG. [Figure 12] 6 is a graph illustrating the change over time in the hypochlorous acid concentration, the average inlet hydrogen sulfide concentration, and the amount of chemical solution discharged in the deodorizing device 100. [Figure 13] FIG. 2 is a diagram showing an example of the configuration of a device for verifying the deodorizing effect of the deodorizing device 100. [Figure 14]14(a) shows the configuration of the measurement unit 50, FIG. 14(b) shows a plan view of the exterior of the measurement unit 50, and FIG. 14(c) shows a perspective view of the exterior of the measurement unit 50.

[0036] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the following embodiments are not intended to limit the scope of the present invention. Furthermore, the same or similar components will be designated by the same reference numerals, and their description may be omitted.

[0037] (Embodiment 1) <Device configuration> Fig. 1 shows the configuration of a deodorizing apparatus 100 according to one embodiment of the present invention. As shown in Fig. 1, the deodorizing apparatus 100 is a wet deodorizing apparatus that includes a deodorizing tower 1 and mixes a chemical solution with an odorous gas and causes the mixture to react with the gas to deodorize it. The gas G to be treated containing odorous components to be treated (for example, odorous gas containing sulfur-based odorous components such as ammonia and hydrogen sulfide) is taken in from a gas inlet 2 of the deodorization tower 1 and guided into the deodorization tower 1 through a first pipe 3. Hereinafter, the gas G to be treated, which is an odorous gas, will be referred to as gas G. The gas G introduced into the deodorization tower 1 is released from the open end 3 a of the first pipe 3 and advances upward in the deodorization tower 1 . A fan may be further provided in the first pipe 3 to guide the gas G.

[0038] An odor component detector S (gas detector) is installed in the first pipe 3, which is the inlet side of the gas G in the deodorization tower 1. The detector S is a gas concentration measuring device that can constantly measure and monitor the concentration of odor components contained in the gas G. In the following, an example will be described in which a hydrogen sulfide sensor is used as the detector S and hypochlorite is used as the chemical, but the present invention is not limited to this example. An ammonia sensor, an aldehyde sensor, or the like can also be used as the detector S. For example, a similar device configuration and control are possible for an acid washing tower using an ammonia sensor. The same is true for an aldehyde washing tower using an aldehyde sensor. The chemical used in the chemical solution 5 can be any known chemical appropriate for the odor components contained in the gas G to be treated.

[0039] A chemical solution 5 (containing, for example, sodium hypochlorite) that reacts with the gas G is released (sprayed) from a chemical solution release (spray) unit 4 (for example, a spray nozzle). The area between the chemical solution release unit 4 and a circulating chemical solution tank 9 (described later) constitutes a reaction unit where odor components contained in the gas G are mixed with the chemical solution 5 and undergo a chemical reaction. The released chemical solution 5 is supplied to the filling section 6 located below the chemical solution releasing section 4. The filling section 6 is made of porous ceramic, plastic, or the like, and is equipped with a filler, which is a catalyst that promotes the reaction between the chemical solution 5 and the gas G. As an oxidation catalyst with particularly high oxidation ability, a known porous wet ceramic oxidation catalyst can be suitably used. The combination of the chemical solution releasing section 4 and the filling section 6 located immediately below it constitutes a reaction module for reacting the gas G with the chemical solution 5. For the sake of visibility, the chemical solution 5 is omitted from the drawing.

[0040] The released chemical solution 5 comes into contact with the gas G on the surface of the filler and, as will be described later, chemically reacts with the odorous components contained in the gas G. The odorous components that have reacted with the chemical solution 5 move downward (fall) together with the chemical solution 5.

[0041] The gas G deodorized by the chemical solution 5 flows out of the deodorizing tower 1 from an outlet 8 via a demister 7 installed above. The demister 7 is made of, for example, mesh wire, and is a gas-liquid separator that removes mist (of the chemical solution 5) contained in the gas G. The chemical solution 5 separated by the demister 7 moves (falls) downward.

[0042] The chemical solution 5 that has reacted with the gas G is stored in a circulating chemical solution tank (chemical solution storage section) 9 located below the filling section 6. A second pipe 11 is connected to a first outlet 10 (circulation outlet) provided in the circulating chemical tank 9, and the second pipe 11 is connected to an inlet of a first pump 12 provided outside the deodorizing tower 1. A third pipe 13 is connected to an outlet (discharge portion of the chemical 5) of the first pump 12. The first pump 12 is a chemical circulation pump that circulates the chemical and supplies it to the reaction section, and functions as a chemical supply device.

[0043] The third pipe 13 may be branched into a fourth pipe 15 and a fifth pipe 16 at a branching portion 14. The fourth pipe 15 is connected to the chemical solution releasing portion 4 via an inlet 17 of the deodorizing tower 1. Furthermore, at the branching section 14, a valve (not shown) may be provided in each of the fourth pipe 15 and the fifth pipe 16, and the distribution ratio of the chemical solution 5 flowing into the fourth pipe 15 and the fifth pipe 16 may be adjusted by adjusting the opening degree of each valve. The second pipe 11, the third pipe 13, and the fourth pipe 15 constitute a circulation pipe for circulating the chemical solution 5 for reaction with the gas G.

[0044] A flow meter 18 is provided on the fourth pipe 15. The flow rate of the chemical solution 5 flowing through the fourth pipe 15 can be measured and monitored by the flow meter 18. In addition, a pH meter 19 is provided in the third pipe 13, and the pH of the circulating chemical solution 5 can be measured and monitored.

[0045] A hypochlorous acid concentration meter 20 is provided in the fifth pipe 16, which makes it possible to measure and monitor the concentration of hypochlorous acid in the chemical solution 5 flowing through the fifth pipe 16. The fifth pipe 16 extends to an upper portion of the circulating chemical solution tank 9 in the deodorizing tower 1 via an inlet 21, and introduces the chemical solution 5 into the circulating chemical solution tank 9. Therefore, the fifth pipe 16 samples a part of the circulating chemical liquid 5.

[0046] The chemical solution 5 is circulated by a first pump 12 through a first flow path (deodorizing circulation flow path) consisting of a circulating chemical solution tank (chemical solution storage section) 9, a second pipe 11, a third pipe 13, a fourth pipe 15, and a chemical solution release section 4, and a second flow path consisting of a circulating chemical solution tank (chemical solution storage section) 9, the second pipe 11, the third pipe 13, and a fifth pipe 16. The first flow path is a main flow path, and the second flow path is a sub-flow path for sampling a portion of the chemical solution 5. The flow rate of the circulating chemical solution 5 (or the flow rate at which the chemical solution 5 is supplied to the chemical solution discharging portion 4) can be controlled by the first pump 12.

[0047] Furthermore, a second outlet 22 (external outlet) is provided in the circulating chemical liquid tank 9. The second outlet 22 is connected to an inlet of a second pump 24 by a sixth pipe 23, and the outlet of the second pump 24 is connected to a drain pipe (drain) 25. The chemical solution 5 stored in the circulating chemical solution tank 9 is discharged to the outside of the deodorizing device 100 by the second pump 24. The second pump 24 functions as a chemical liquid discharge device that controls the discharge amount of the chemical liquid 5 by controlling the flow rate of the chemical liquid 5 flowing through the sixth pipe 23 and thereby discharges the chemical liquid 5. Although the first outlet 10 may be branched and connected to the sixth pipe 23, it is preferable to provide the second outlet 22 independently from the viewpoint of flow rate control of the chemical solution 5.

[0048] The sixth pipe 23 may be provided with a valve and a flow meter for controlling the flow rate of the chemical solution 5. The chemical solution may also be discharged using the siphon principle without using the second pump 24. In this case, the sixth pipe 23 constituting a siphon equipped with a valve and a flow meter functions as a chemical solution discharge device.

[0049] As an example, the deodorization apparatus 100 includes a chemical (sodium hypochlorite) supply device 26. The sodium hypochlorite supply device 26 is connected to a seventh pipe 27, which extends into the deodorization tower 1 via an inlet 28 of the deodorization tower 1. The sodium hypochlorite supply device 26 supplies sodium hypochlorite to the circulating chemical tank 9 in the deodorization tower 1 via the seventh pipe 27. Sodium hypochlorite can be supplied by a pump from a tank (not shown), but as will be described later, it may also be supplied by electrolyzing an aqueous sodium chloride solution in an electrolytic cell. The sodium hypochlorite supply device 26 is controlled by a control device 33 described later, and can control the concentration of sodium hypochlorite in the chemical solution 5 to be within a predetermined range, for example, 400 to 500 ppm, based on the output of the hypochlorous acid concentration meter 20.

[0050] The pH value of the chemical solution 5 can also be controlled by the concentration of sodium hypochlorite supplied by the sodium hypochlorite supply device 26, but if it is difficult to quickly increase the pH value using only the sodium hypochlorite supply device 26, the pH value may be controlled by injecting an alkaline solution such as caustic soda. For this reason, the deodorizing apparatus 100 may include a tank 29 that stores an alkaline solution, and an eighth pipe 30 may be connected to the tank 29. The eighth pipe 30 extends into the deodorizing tower 1 via an inlet 31 of the deodorizing tower 1. A third pump 32 is installed in the eighth pipe 30. The third pump 32 can inject the alkaline solution, such as caustic soda, in the tank 29 into the circulating chemical tank 9 of the deodorizing tower 1. In this way, the tank 29 and the third pump 32 constitute an alkaline solution supply device and also function as a pH value adjusting device. The third pump 32 is controlled by a control device 33 (described later) and can control the pH value of the chemical solution 5 based on the output of the pH meter 19. Therefore, the deodorizing apparatus 100 can maintain the pH value of the chemical solution 5 within a predetermined range, for example, 7.0 to 7.8, by using the alkaline solution supplying device consisting of the sodium hypochlorite supplying device 26 and / or the tank 29 in combination with the third pump 32.

[0051] The deodorizing device 100 is equipped with a control device 33, which receives signals from the detectors, controls the pumps and other devices, and controls the operation of the deodorizing device 100.

[0052] A detector S (e.g., a hydrogen sulfide sensor) installed on the inlet side of the deodorization tower 1 is connected to the control device 33 by a first signal line 34 (sensor signal line). The output of the detector S is input to the control device 33 via the first signal line 34, and the control device 33 can monitor the concentration of odorous components contained in the gas G and record the result in a recording device of the control device 33. Similarly, the flow meter 18, pH meter 19, and hypochlorous acid concentration meter 20 are connected to the control device 33 by a second signal line 35 (flow meter signal line), a third signal line 36 (pH meter signal line), and a fourth signal line 37 (concentration meter signal line), respectively. The outputs of the flow meter 18, pH meter 19, and hypochlorous acid concentration meter 20 are input to the control device 33 via the second signal line 35, the third signal line 36, and the fourth signal line 37, respectively. The control device 33 monitors the flow rate, pH value, and hypochlorous acid concentration of the chemical solution 5, and can record them in a recording device of the control device 33.

[0053] The control device 33 determines the operating conditions based on the concentration of odorous components contained in the input gas G, the flow rate of the chemical solution 5, the pH value, and the concentration of hypochlorous acid. The control device 33 is connected to the first pump 12, the second pump 24, the sodium hypochlorite supply device 26, and the third pump 32 via a fifth signal line 38, a sixth signal line 39, a seventh signal line 40, and an eighth signal line 41, respectively. As will be described later, the control device 33 generates control signals based on the determined operating conditions and outputs them to the first pump 12, the second pump 24, the sodium hypochlorite supply device 26, and the third pump 32 via a fifth signal line 38, a sixth signal line 39, a seventh signal line 40, and an eighth signal line 41, respectively, to control these devices. As a result, the control device 33 controls the operation of the deodorizing device 100 while monitoring the concentration of odorous components contained in the gas G, the flow rate of the chemical solution 5, the pH value, and the concentration of hypochlorous acid. The control device 33 may be a microcomputer or a personal computer equipped with a calculation device, an input / output device, and a recording device.

[0054] 2 is a partially enlarged view showing an example of the configuration of sodium hypochlorite supply device 26 that supplies sodium hypochlorite. As shown in FIG. 2, sodium hypochlorite supply device 26 may be configured with an electrolytic cell 261 and a pump 262, and an aqueous sodium chloride solution may be generated by electrolysis and supplied to chemical solution 5.

[0055] As shown in Fig. 2, the circulating chemical tank 9 is provided with a third outlet 263. One end of a pipe 264 (corresponding to the seventh pipe 27 in Fig. 1) is connected to the third outlet 263, and the other end is disposed above the circulating chemical tank 9 via an inlet 28. An electrolytic cell 261 and a pump 262 are installed in the piping 264. The pump 262 introduces the chemical solution 5 from the circulating chemical solution tank 9 into the piping 264 from a third outlet 263, and returns it to the circulating chemical solution tank 9 via the electrolytic cell 261. The chemical solution 5 that has flowed into the electrolytic cell 261 is electrolyzed to produce sodium hypochlorite. The amount of sodium hypochlorite produced can be controlled by the power input to the electrolysis electrodes of the electrolytic cell 261 , but can also be controlled by the flow rate of the chemical solution 5 flowing through the electrolytic cell 261 . The flow rate of the chemical solution 5 flowing through the electrolytic bath 261 can be controlled by a pump 262 .

[0056] It is also possible to branch off the pipe 264 between the third outlet 263 and the pump 262 and connect it to a tank (not shown) via the pipe, and replenish the sodium chloride aqueous solution and / or water from the tank or the like.

[0057] <Operation control> The concentration of odorous components contained in the gas G is generally not constant, but varies depending on the season, time of day, environmental temperature, and the like. FIG. 3 is a graph showing the change over time (daily change) in the concentration of odorous components contained in gas G. The vertical axis represents the concentration of odorous components, and the horizontal axis represents time. The solid line in FIG. 3 represents the concentration of odorous components. Conventional deodorizing devices set the sodium hypochlorite concentration of the circulating chemical solution and the amount (flow rate) released from the chemical solution release section so that they can deodorize gas G at its maximum concentration. For example, the amount (and hypochlorous acid concentration) of chemical solution 5 released that can deodorize gas G at an odorous component concentration (dotted line in FIG. 3) that takes into account a margin (room) relative to the maximum odorous component concentration (solid line) is determined, and that amount is used as a set value (fixed value). As such, the power consumption to operate the chemical solution and deodorizing device is determined by the maximum concentration of odorous components contained in gas G, making the conventional deodorizing method of supplying a fixed amount of chemical solution uneconomical. Therefore, by changing the operating conditions of the deodorizing device in accordance with the actual concentration of odorous components in the gas G, the gas G can be deodorized efficiently.

[0058] Since the concentration of odor components in gas G is not constant over time, the detector S measures the concentration of odor components at a predetermined sampling interval, for example, at one-minute intervals. The concentration value of the odor component measured by the detector S is input to the control device 33 via a first signal line . The recording device of the control device 33 stores the dependence of the deodorization efficiency (odor component removal efficiency) on the concentration values ​​of odor components and the flow rate of the chemical solution 5, which have been obtained in advance through experiments, etc. Therefore, the control device 33 can determine the release flow rate of the chemical solution 5 from the chemical solution release unit 4 (or the circulating chemical solution flow rate of the chemical solution 5 circulating through the first flow path) based on the obtained odor component concentration values ​​(and the air volume of the gas G). In order to increase the release flow rate of the chemical solution 5 from the chemical solution release unit 4 as the concentration of the odor components increases, for example, the release flow rate of the chemical solution 5 from the chemical solution release unit 4 (circulating chemical solution flow rate) is determined in proportion to the concentration of the odor components. For example, if the concentration of the odor components in the gas G at time t is g(t) and the release flow rate of the chemical solution 5 from the chemical solution release unit 4 is F(t), F(t) is given as follows: F(t)=Ag(t) Here, A is a constant. However, if experiments show that the deodorizing efficiency of the chemical solution 5 depends on the concentration of odorous components contained in the gas G, A may be a function representing the concentration of the odorous components (A=A(g(t))).

[0059] The control device 33 transmits a control value corresponding to the discharge flow rate of the chemical solution 5 from the chemical solution discharge part 4 to the first pump 12. The first pump 12 controls, for example, the rotation speed in accordance with the received control value, thereby controlling the flow rate of the chemical solution 5 flowing through the third pipe 13. The control value may be, for example, a flow rate value or a value of power supplied to the first pump 12.

[0060] Instead of controlling the rotation speed of the first pump 12, the flow rate of the chemical solution 5 may be controlled by providing a valve such as a proportional electromagnetic valve on the discharge side of the first pump 12 and controlling the valve opening. Controlling the flow rate of liquid such as the chemical solution 5 by changing the valve opening degree can be similarly applied to other pumps. Furthermore, the above does not limit the flow rate control method for the chemical liquid 5, and does not exclude other flow rate control methods.

[0061] Furthermore, when the air volume of gas G changes, the air volume value of gas G may be input to the control device 33, and the flow rate of chemical solution 5 may be determined based on the air volume value of gas G and the concentration of odorous components. In this case, the dependence of deodorizing efficiency on the concentration of odorous components, the air volume of gas G, and the flow rate of chemical solution 5 may be obtained in advance by experiment or the like, and stored in a recording device of the control device 33. For example, the flow rate of the liquid chemical 5 released from the liquid chemical release part 4 may be determined by the product of the flow rate of the gas G and the concentration of the odor component. In this case, the flow rate of the gas G may be defined as J(t), and F(t) may be set as follows: F(t)=Ag(t)J(t) The above formula corresponds to the amount of odor components flowing into the deodorizing device 100 per unit time. Therefore, in cases where the air volume of the gas G fluctuates, the amount of odor components per unit time can be used instead of the concentration of the odor components. That is, in each embodiment, the amount of odor components per unit time can be used as the concentration of the odor components.

[0062] The control device 33 may input the flow rate value of the chemical liquid 5 measured by the flow meter 18 at a predetermined sampling period (for example, every minute) and feed back the flow rate value measured by the flow meter 18 to control the first pump 12 (or a valve installed in the first pump 12).

[0063] The sodium hypochlorite concentration of the chemical solution 5 is measured by the hypochlorous acid concentration meter 20 at a predetermined sampling period (for example, every 1 minute), and the measured value of the sodium hypochlorite concentration is input to the control device 33 via the fourth signal line 37. Based on the input sodium hypochlorite concentration, the control device 33 transmits a control value to the sodium hypochlorite supply device 26 so that the sodium hypochlorite concentration becomes a predetermined value, for example. For example, when the sodium hypochlorite supply device 26 supplies sodium hypochlorite from the electrolytic cell 261 as shown in FIG. 2, the amount of sodium hypochlorite supplied can be controlled by controlling the voltage applied to the electrodes of the electrolytic cell 261, or when sodium hypochlorite is supplied from a tank by a pump, by controlling the pump. As a result, the concentration of sodium hypochlorite in the chemical solution 5 can be set to a predetermined value.

[0064] Furthermore, the value of the sodium hypochlorite concentration may be set according to the concentration of odorous components measured by the detector S. For example, the set value of the sodium hypochlorite concentration can be increased as the concentration of odorous components increases. The dependence of the deodorizing efficiency on the concentration of odorous components and the concentration of sodium hypochlorite may be obtained in advance and stored in the recording device of the control device 33. The control device 33 sets the sodium hypochlorite concentration according to the concentration of the odorous components, and controls the sodium hypochlorite supply device 26 so that the measurement value of the hypochlorous acid concentration meter 20 matches the set value of the sodium hypochlorite concentration.

[0065] The pH of the chemical solution 5 is measured by the pH meter 19 at a predetermined sampling period (for example, at one-minute intervals), and the measured pH value is input to the control device 33 via a third signal line . The control device 33 transmits a control value to a third pump 32 (alkaline solution supply pump) connected to the tank 29 based on the input measured pH value. For example, when the measured pH value is lower than a predetermined value (target pH value), the control device 33 drives the third pump 32 to inject an alkaline solution such as caustic soda stored in the tank 29 into the third pump 32 in order to raise the pH value. For example, the control device 33 may control the third pump 32 to increase the flow rate of the alkaline solution to the circulating chemical liquid tank 9 as the difference between the measured pH value and the predetermined value increases, and may control the flow rate of the alkaline solution by, for example, PID control (Proportional-Integral-Differential Controller). The control device 33 stores the optimum pH value of the chemical solution 5 (for example, 7.0 to 7.8) in a recording device.

[0066] As described above, the deodorizing device 100 adjusts the sodium hypochlorite concentration and the flow rate of the chemical solution 5 according to the concentration of odorous components contained in the gas G to be treated, so that the sodium hypochlorite concentration and the flow rate of the chemical solution 5 are not set excessively, thereby reducing the consumption of the chemical (chemical solution 5) and the power consumption of the deodorizing device 100 and enabling efficient deodorization. In addition, the response to the concentration of odorous components is superior to the control of the flow rate of the chemical solution 5 compared to the control of the sodium hypochlorite concentration (chemical component concentration), and therefore, for example, only the flow rate control of the chemical solution 5 may be adopted.

[0067] The above method is based on the assumption that the odor component removal efficiency (deodorization efficiency) of the chemical solution 5 is constant. However, when the deodorization process of the gas G is performed by the deodorizing device 100, the deodorization efficiency of the chemical solution 5 actually tends to change (decrease) over time. Wet deodorizing devices deodorize odorous gases by the reaction between the circulating chemical solution and the odorous components contained in the odorous gas. The deterioration of the deodorizing efficiency is thought to be due to the deterioration of the chemical solution used. It is necessary to operate the deodorizing device under operating conditions with a sufficient margin so that odorous components can be removed even when the deodorizing efficiency is reduced, which results in wasteful consumption of chemicals and electricity to operate the deodorizing device. To restore the deodorizing efficiency, the chemicals must be replaced during regular maintenance. However, increasing the frequency of chemical replacement to ensure the deodorizing efficiency increases chemical waste. As a result, economic efficiency decreases and the burden on the operator increases. A more efficient deodorizing method will be described below.

[0068] The causes of the deterioration of the deodorizing efficiency of the chemical solution used to remove the deodorizing components will be considered below. The main reactions between the gas G to be treated and the chemical solution 5 are exemplified by the following reaction formulas 1 to 7. (Formula 1) H2S+4NaOCl+2NaOH→Na2SO4+4NaCl+2H2O (Formula 2) H2S+NaOCl→S+NaCl+2H2O (Formula 3) CH3SH+3NaOCl+NaOH→CH3SO3Na+3NaCl+H2O (Formula 4)(CH3)2S+2NaOCl→(CH3)2SO2+2NaCl (Formula 5) (CH3)2S2+5NaOCl+2NaOH→2CH3SO3Na+5NaCl+H2O (Formula 6)2NH3+3NaOCl→N2+3NaCl+3H2O (Formula 7)CO2+2NaOH→Na2CO3+H2O In the above formula, the products Na2SO4, NaCl, S, CH3SO3Na, (CH3)2SO2, and Na2CO3 dissolve or accumulate in the circulating chemical solution 5 as "salts." As a result of investigating actual deodorization processes, as the deodorization process of gas G progresses, "salt" accumulates in chemical solution 5, and the "salt" concentration in chemical solution 5 can become higher than the concentration of sodium hypochlorite or caustic soda, for example, even several orders of magnitude higher.

[0069] From the above reaction formula, it is believed that the main reason for the deterioration of the deodorizing efficiency of the chemical solution 5 is that the concentration of "salt" in the chemical solution 5 increases when the deodorizing treatment of the gas G is performed, suppressing the progress of the reaction between the chemical solution and the odor components (the reaction to the right in the above formula). Furthermore, if a high concentration of "salt" is present in the chemical solution 5, it may precipitate in the piping and the chemical solution discharge part 4. The inventors have found that reducing the amount of "salt" that is generated and accumulated by the above-mentioned chemical reactions and the like is effective in reducing deterioration over time in the deodorizing efficiency of the chemical solution 5.

[0070] The deodorizing device 100 includes a second pump 24 that discharges the chemical solution 5 from the circulating chemical solution tank (chemical solution storage section) 9. The second pump 24 functions as a drainage pump. The detector S measures the concentration of odor components contained in the gas G at a predetermined sampling period and outputs the measurement values ​​to the control device 33. The control device 33 can record the received odor component concentration measurement values ​​in a recording device. Furthermore, the control device 33 uses the recorded odor component concentration measurement values ​​to integrate the odor component concentrations for a predetermined period (integration period) using an arithmetic processing device. Therefore, the integration period (integration cycle) is longer than the sampling cycle of the detector S, and can be set to a natural number multiple of the sampling cycle of 2 or more, for example, 5 times (5 minutes). In this way, by using the integrated value for the past 5 minutes as the odor component concentration, real-time performance is hardly lost and rapid fluctuations in concentration can be followed. It is also possible to control the flow rate at which the chemical solution 5 is discharged in accordance with an average value for a predetermined period of time, instead of the integrated value of the detected odor component concentration. Furthermore, the flow rate at which the chemical solution 5 is discharged may be controlled according to the odor component concentration without integrating the detected odor component concentration. In this case, the operating time of the second pump 24 increases, and power consumption increases, but it is possible to reduce the amount of "salt" produced by the reaction.

[0071] In the deodorizing device 100, the odor components contained in the gas G react with the chemical solution 5 and are removed, so the integrated value of the concentration of the odor components over a specified period of time can be used as an indicator reflecting the amount of "salt" produced by the reaction.

[0072] The control device 33 determines the discharge amount of the chemical solution 5 based on the integrated value of the odor component concentration for each integration period. As described above, the integrated value is used as an index that reflects the amount of "salt" produced by the chemical reaction, so the control device 33 calculates the integrated value (integral value) of the odor component concentration by adding together (time-integrating) multiple measurement values ​​that are continuously output by the gas detector S within the most recent predetermined time range.

[0073] For example, if the concentration of odor components contained in gas G at time t is g(t), the integration time interval is T, and the discharge amount of chemical solution 5 is V(t), then V(t) is as follows: V(t)=∫Bg(τ)dτ However, the time integration range is from tT to t. where B is a constant. If the amount of "salt" produced (or the reaction rate for producing "salt") depends on the concentration of odorous components contained in gas G, B may be a function of the concentration of the odorous components (B = B(g(t))), but B is usually a constant.

[0074] Detector S measures the concentration of odor components contained in gas G at a specified sampling period (interval), so V(t) is discretely integrated. If B is a constant and the sampling period (sampling interval) is D, V(t) at time t = ti can be calculated using the following formula: V(t)=BΣDg(tk) Here, g(tk) is the measured value of the concentration of odor components contained in gas G at the kth measurement time tk, and Σg(tk) means the sum of the concentrations of odor components in the most recent consecutive specified range (from k=in to i, i.e., from time ti-n to ti), which means the sum of the measured concentrations of (n+1) odor components. If the sampling period D is constant (does not depend on the time tk), the following occurs: V(t)=BDΣg(tk) The sampling period of the detector S may be changed depending on the behavior (absolute value and rate of change) of the concentration of odor components contained in the actual gas G, for example, depending on the time of day or season. When the sampling period D changes depending on the time ti, it is as follows: V(t)=BΣD(tk)g(tk)

[0075] If the flow rate of gas G changes, V(t) may be calculated using the product g(t)J(t) of the gas flow rate J(t) and the odor component concentration g(t) using the following formula: V(t)=∫Bg(τ)J(τ)dτ or V(t)=BΣDg(tk)J(tk)

[0076] The control device 33 transmits a control value to the second pump 24 via a sixth signal line 39 in accordance with the discharge amount of the chemical solution 5. The discharge amount of the chemical solution 5 is determined by the time integral of the flow rate (discharge rate) of the second pump 24, so for example, the flow rate of the chemical solution 5 and a discharge time are specified for the second pump 24. The chemical solution 5 discharged from the second pump 24 is discharged via a drain 25. In this way, the chemical solution 5 is partially discharged by the second pump 24 for each integration period, by an amount determined based on the integrated value of the odor component concentration during the integration period. For example, 0.01 to 10% of the chemical solution 5 is discharged relative to the circulation flow rate of the chemical solution 5. The partial discharge cycle of the chemical solution 5 can also be set to coincide with, for example, the integration cycle of the odor component concentration.

[0077] For the purpose of managing the chemical liquid 5, the control device 33 may calculate the total discharge amount of the chemical liquid 5 from the command value of the second pump 24 and store the calculated amount in a recording device.

[0078] 4 is a graph illustrating the deodorization time dependency of the circulation flow rate and discharge rate of the chemical solution 5. The circulation flow rate of the chemical solution 5 immediately reflects the concentration of the odorous components contained in the gas G measured by the gas detector S, and the discharge rate of the chemical solution 5 reflects the integrated value of the concentration of the odorous components. As shown in Figure 4, the fluctuations in the discharge amount of chemical solution 5 are gradual compared to the fluctuations in the circulation flow rate of chemical solution 5. Because the discharge of chemical solution 5 is partial and is performed to reduce the accumulation of "salt," the discharge amount of chemical solution 5 can be determined based on the integrated value of the concentration of the odorous components, rather than the discharge of chemical solution 5 being determined in immediate response to fluctuations in the concentration of the odorous components contained in gas G. The integration period (integration time) can be set independently of the sampling period of the gas detector S, so that an integration time interval can be set that prevents the accumulation of "salt" while reducing the loss of the chemical solution 5.

[0079] The time period for integrating the odor component concentrations is not limited to a fixed cycle. The time for integrating the odor component concentration may be changed as appropriate. For example, if the odor component concentration depends on the time of day or the season, the integration time may be set relatively long during times of the day or seasons when the odor component concentration is expected to be low. For example, the odor concentration integration time may be changed depending on the time of day, such as by setting the odor concentration integration time to five times the sampling cycle of the gas detector S between 6:00 AM and 10:00 AM and between 2:00 PM and 6:00 PM, and ten times the sampling cycle of the gas detector S during other times of the day. The operating time of the second pump 24 may be reduced and power consumption may be reduced by setting a longer time period for integrating the odor component concentration during times when the odor component concentration is expected to be low.

[0080] Furthermore, instead of discharging a portion of the chemical solution 5 at each integration period (or predetermined integration time) of the odor component concentration, a configuration may be adopted in which a portion of the chemical solution 5 is discharged when the integrated value of the odor component concentration exceeds a preset threshold value (determination value). Even in this case, the operating time of the second pump 24 is managed based on the integrated odor component concentration, thereby making it possible to reduce power consumption. The integrated value of the concentration of odor components can be calculated using ∫g(τ)dτ or ΣDg(tk).

[0081] In this way, the deodorizing device 100 can reduce the accumulation of "salt" by discharging a portion of the chemical solution 5 used in the deodorizing treatment based on the integrated value of the concentration of odorous components contained in the gas G at predetermined intervals. Since the amount of chemical solution 5 discharged is adjusted based on the output of the gas detector S, loss of chemical solution 5 due to periodic maintenance replacement of the chemical solution 5 (or periodic replacement of a fixed amount of chemical solution) can be reduced, and the burden on the operator can be reduced. Furthermore, the frequency of maintenance for chemical solution replacement can be reduced.

[0082] The timing for discharging the chemical liquid 5 can be set independently of the sampling period of the gas detector S, and the discharge amount of the chemical liquid 5 can also be set independently of the amount of the chemical liquid 5 discharged from the chemical liquid discharge section 4. Therefore, it is possible to set the amount of the chemical liquid 5 to minimize loss in accordance with the operating status of the deodorizing device 100 and changes in the concentration of odorous components contained in the gas G.

[0083] Furthermore, in addition to the integrated value of the odor component concentration for each integration period, the control device 33 may calculate the total integrated value of the odor component concentration from the start of use of the chemical solution 5 (immediately after replacing the chemical solution 5) and store it in the recording device. Although the accumulation of "salt" can be reduced by periodically (or intermittently) partially discharging the chemical solution 5, in order to deal with the cumulative increase in the accumulation of "salt" that cannot be completely discharged, the discharge amount of the chemical solution 5, which is determined by the integrated value of the concentration of odorous components for each accumulation period, may be corrected by the total integrated value of the concentration of odorous components. If the corrected discharge amount of the chemical solution 5 is V'(t) and the total integrated value (time integral) of the odor component concentration is S(t), the discharge amount of the chemical solution 5 may be corrected, for example, as follows. V'(t)=V(t)(1+CS(t)) where C is a constant. The above formula corrects the discharge amount of chemical solution 5 by multiplying the original discharge amount of chemical solution 5 V(t) by a correction coefficient (1 + CS(t)), which gradually increases the discharge amount of chemical solution 5 as the total integrated value of the odor component concentration increases.

[0084] The total integrated value (time integral) S(t) of the concentration of odorous components is calculated by the following formula, assuming that the time when the chemical solution 5 starts to be used is t=0. S(t)=∫g(τ)dτ However, the time integration range is from 0 to t. In reality, the detector S measures the concentration of odor components contained in the gas G at a predetermined sampling period (interval), so the sampling period (sampling interval) is defined as D(ti), as follows: S(t)=Σg(ti)D(ti) and if D(ti) is constant, it becomes as follows: S(t)=DΣg(ti) However, the integration period is from time 0 to t.

[0085] The control device 33 drives the pump to replenish the chemical liquid 5, and can therefore integrate the amount of the replenished chemical liquid 5 and store the change in the amount of increase or decrease of the chemical liquid 5 in a recording device. Therefore, the control device 33 can record the total amount of the chemical solution 5 discharged and the total amount of the chemical solution 5 replenished, and can manage the volume of the chemical solution 5 used in the deodorizing device 100 . The chemical solution 5 that is reduced by being discharged can be replenished from the sodium hypochlorite supply device 26, but additional piping and a pump may be provided to replenish the chemical solution 5.

[0086] Furthermore, a separate water level gauge (or liquid level gauge) may be provided in the circulating chemical tank (chemical storage section) 9 to output the volume of the chemical 5 to the control device 33, and the volume of the chemical 5 may be managed by the control device 33. The refill cycle of the chemical solution 5 may be the same as the drain cycle of the chemical solution 5 (the cumulative period of the concentration of odorous components) or a natural number multiple thereof, but is not limited thereto. The chemical solution 5 may be refilled as needed depending on the volume (or water level) of the chemical solution 5 stored in the circulating chemical solution tank (chemical solution storage section) 9.

[0087] As described above, the deodorizing device 100 measures the concentration of odorous components contained in the inflowing gas G at a predetermined sampling period using the gas detector S, and changes the flow rate of the circulating chemical solution 5 in real time based on the concentration of the odorous components, thereby enabling instant adjustment of the odorous component removal capacity. Furthermore, the deodorizing device 100 calculates the integrated value of the concentration of odorous components at a predetermined integration period, and discharges a portion of the chemical solution 5 based on the integrated value of the concentration of the odorous components, thereby reducing the accumulation of the ``salt'' that is generated and reducing deterioration of the chemical solution 5. For example, if gas G with a high concentration of odorous components flows in, the flow rate of chemical solution 5 released from chemical solution release unit 4 can be increased to quickly respond and remove the odorous components, and if the concentration of odorous components contained in gas G decreases, the flow rate of chemical solution 5 can be reduced, reducing the consumption of chemical solution 5 and electricity. On the other hand, the discharge amount for reducing the accumulation of "salt" is determined based on the concentration of odorous components, so excessive chemical solution 5 is not discharged, and it is possible to remove odorous components with the optimal chemical solution 5 while preventing loss of chemical solution 5. As a result, the deodorizing device 100 can perform the deodorizing process of the gas G efficiently in terms of both economical and energy consumption, and can also reduce the burden on the operator.

[0088] The method of discharging a portion of the chemical solution 5 based on the integrated value of the odor concentration to reduce the accumulation of "salt" can be applied not only to other embodiments but also to conventional deodorizing devices that release a constant supply flow rate of the chemical solution 5 from the chemical solution release section 4.

[0089] Instead of discharging the chemical solution 5 based on the integrated value of the odor component concentration by the second pump 24, the fourth pipe 15 may be branched, a drain pipe may be connected, and the chemical solution 5 may be partially discharged from the drain pipe (drain) 25 via a proportional electromagnetic flow control valve. In this case, the control device 33 may control the proportional electromagnetic flow control valve instead of controlling the second pump 24, and may partially discharge the chemical solution 5 based on the integrated value of the odor component concentration. By controlling both the first pump 12 and the proportional electromagnetic flow control valve, the flow rate discharged from the drain pipe 25 and the flow rate released from the chemical solution releasing portion 4 can be controlled. Although advanced control technology for the first pump 12 and the proportional electromagnetic flow control valve is required, the second pump 24 can be eliminated, allowing the device to be made smaller.

[0090] As described above, FIG. 4 shows an example in which the supply flow rate of the chemical liquid 5 to the filling section 6 and the discharge amount of the chemical liquid 5 are combined based on the detected odor component concentration. However, as will be described below, the control of the chemical component concentration of the chemical liquid 5 and the discharge amount of the chemical liquid 5 may also be combined.

[0091] FIG. 5 shows an example in which a hydrogen sulfide sensor is used as the detector S, the flow rate of the chemical solution 5 supplied (released) to the filling section 6 is kept constant, and the discharge amount of the chemical solution 5 is controlled based on the detected concentration of the odorous component (hydrogen sulfide), and the concentration of the chemical component (hypochlorous acid concentration), which is a chemical component, is also controlled. The horizontal axis represents time, the left vertical axis represents concentration, and the right vertical axis represents flow rate, with the solid line (A) representing the hypochlorous acid concentration, the dotted line (B) representing the hydrogen sulfide concentration of gas G, and the dashed line (C) representing the discharge flow rate of chemical solution 5. Note that the odor component concentration and chemical component concentration are appropriately scaled so as to be displayed on the same axis. The measurements were conducted on August 21-23, 2020, during a spring tide, which caused the tide to rise. As a result, seawater flowed into the sewer pipes, resulting in a phenomenon in which the concentration of odorous components near the entrance to the deodorizing equipment was higher than usual.

[0092] In Figure 5, during periods when the odor component concentration is high, the hypochlorous acid concentration is highly responsive to the odor component concentration, and the hypochlorous acid concentration also increases or decreases in response to increases or decreases in the inlet concentration. On the other hand, during periods when the odor component concentration is low, the hypochlorous acid concentration does not decrease below a certain concentration. When the odor component concentration is high, the odor component reacts quickly with the chemical component in chemical solution 5, resulting in the consumption of the chemical component. Furthermore, by controlling the amount of drainage of chemical solution 5 in accordance with the odor component concentration of gas G, inhibition of the chemical reaction due to the generation of "salt" in chemical solution 5 is prevented. Therefore, a good balance is maintained between the supply of chemical component (sodium hypochlorite) from chemical supply device 26 and the consumption of chemical component (sodium hypochlorite) due to reaction with odor components, which is thought to improve the responsiveness between the odor component concentration of gas G and the chemical component concentration.

[0093] For example, if the odor component concentration of gas G is higher than a predetermined concentration, the supply of chemical components from chemical supply device 26 is controlled in accordance with the odor component concentration while keeping the amount of chemical 5 released from chemical solution release (spray) unit 4 constant, and if the odor component concentration of gas G is lower than the predetermined concentration, hybrid control is possible in which the amount of chemical 5 released from chemical solution release (spray) unit 4 is controlled in accordance with the odor component concentration while keeping the chemical component concentration of chemical solution 5 constant. When the concentration of odorous components in the gas G is high, limiting the amount of chemical 5 released from the chemical release (spray) section 4 reduces the pressure on the first pump 12 (chemical circulation pump) and the piping connected thereto, thereby reducing the mechanical burden on the deodorizing device 100, thereby improving durability or reducing the frequency of maintenance. The predetermined odor component concentration for changing the operating conditions may be determined based on the responsiveness of the chemical component concentration to the odor component concentration, for example, and may be set to the median value of the chemical component concentration on the vertical axis in FIG.

[0094] Note that the first embodiment can also be applied in combination with an example of a deodorizing device 100 having a plurality of filling sections, as will be explained in the second and third embodiments described later.

[0095] (Embodiment 2) Under normal conditions, the concentration of odorous components contained in gas G changes as shown in Fig. 3, but in some cases, the concentration may suddenly exceed a normally expected value. Therefore, the deodorizing device 100 may have to deal with deodorizing treatment of gas G in which the concentration of odorous components suddenly increases. Figure 6 is a graph showing an example of fluctuations in the concentration of odor components contained in gas G, illustrating an example in which there are time periods in which the concentration of odor components suddenly increases and decreases. In the figure, the vertical axis represents the concentration of odor components, the horizontal axis represents time, and the solid line represents the concentration of odor components contained in gas G. Under normal conditions, the concentration of odor components fluctuates within the range below the dotted line in the figure. However, in time region A, which is hatched in the figure, the concentration of odor components suddenly increases beyond the value indicated by the dotted line. For example, if the concentration of hypochlorous acid is set high in accordance with the concentration of the maximum odor component in time region A, which has a low occurrence frequency, the running cost of chemical solution 5 will increase.

[0096] According to the second embodiment, even in response to fluctuations in the concentration of odorous components contained in the gas G, particularly a sudden increase in the concentration of the odorous components, the concentration of the chemical 5 that reacts with the odorous components contained in the gas G in the filling section 6 is substantially increased without increasing the concentration of the chemical 5 in the circulating chemical tank 9, thereby making it possible to provide a deodorizing device 100 that can promote the reaction between the odorous components and the chemical 5.

[0097] Fig. 7 is a conceptual diagram showing the main configuration of the deodorizing device 100 of embodiment 2. The differences from the deodorizing device 100 of embodiment 1 shown in Fig. 1 are mainly shown, and components that overlap with those of the deodorizing device 100 of embodiment 1 may be omitted.

[0098] As shown in Fig. 7, the deodorizing apparatus 100 includes a first packed section 6a and a second packed section 6b above a circulating chemical tank 9 inside a deodorizing tower 1. The first packed section 6a is disposed above the second packed section 6b, and they are aligned vertically. The first packed section 6a and the second packed section 6b contain a packing material that is a reaction catalyst between the gas G and the chemical 5. The first filling section 6a is installed directly below the first chemical solution discharging section 4a that supplies the chemical solution 5 to the first filling section 6a, and the first reaction module is composed of the combination of the first chemical solution discharging section 4a and the first filling section 6a. Note that the fact that the first filling section 6a is installed directly below the first chemical solution discharging section 4a means that no other filling section (specifically, the second filling section 6b) is installed between the first chemical solution discharging section 4a and the first filling section 6a.

[0099] The second loading section 6b is installed directly below the second chemical solution discharging section 4b that supplies the chemical solution 5 to the second loading section 6b, and the second chemical solution discharging section 4b and the second loading section 6b form a second reaction module. Furthermore, the second chemical solution discharging section 4b is installed below the first loading section 6a. Therefore, the first chemical solution discharge section 4a supplies the chemical solution 5 to both the first filling section 6a and the second filling section 6b located below, and the second chemical solution discharge section 4b supplies the chemical solution 5 to the second filling section 6b located below but does not supply the chemical solution 5 to the first filling section 6a located above. The gas G can react with the chemical solution 5 in the first filling section 6a and the second filling section 6b.

[0100] A first circulation outlet 10a and a second circulation outlet 10b provided in the circulating chemical tank 9 are connected to a first chemical circulation pump 12a and a second chemical circulation pump 12b via pipes 11a and 11b, respectively. The discharge ports of the first chemical liquid circulation pump 12a and the second chemical liquid circulation pump 12b are connected to pipes 13a and 13b, respectively, and are further connected to the first chemical liquid discharge section 4a and the second chemical liquid discharge section 4b via the first inlet 17a and the second inlet 17b of the deodorization tower 1.

[0101] Therefore, the deodorizing device 100 includes a first deodorizing circulation flow path consisting of a circulating chemical liquid tank 9, a first circulation outlet 10a, piping 11a, a first chemical liquid circulation pump 12a, piping 13a, and a first chemical liquid release section 4a, and a second deodorizing circulation flow path consisting of a circulating chemical liquid tank 9, a second circulation outlet 10b, piping 11b, a second chemical liquid circulation pump 12b, piping 13b, and a second chemical liquid release section 4b.

[0102] A first flow meter 18a and a second flow meter 18b are provided on the pipe 13a and the pipe 13b, respectively. The first flow meter 18a and the second flow meter 18b are connected to the control device 33 by a first flow meter signal line 35a and a second flow meter signal line 35b, respectively. The outputs of the first flow meter 18a and the second flow meter 18b are input to the control device 33 via the first flow meter signal line 35a and the second flow meter signal line 35b, respectively. The control device 33 feeds back the flow rate values ​​measured by the first flow meter 18a and the second flow meter 18b to control the first chemical liquid circulation pump 12a and the second chemical liquid circulation pump 12b, thereby circulating the chemical liquid 5 at a predetermined flow rate.

[0103] The principle by which odorous components can be efficiently deodorized by configuring the stuffing section 6 in two stages, the first stuffing section 6a and the second stuffing section 6b, will be described below. 8 is a graph showing a schematic distribution of the concentration of the chemical component (hypochlorous acid) in the chemical solution 5 in the filling section. The vertical axis represents the chemical component concentration, and the horizontal axis represents the distance within the filling section, which is the distance from the upper end surface of the filling section. Figure 8(a) shows the distribution of drug component concentrations in one filling section 6 shown in Figure 1, and Figure 8(b) shows the distribution of drug component concentrations in two filling sections consisting of a first filling section 6a and a second filling section 6b shown in Figure 7. In addition, in FIGS. 8(a) and 8(b), the function indicating the concentration of the chemical component is shown as an example of a linear function for the sake of understanding, but is not limited to a linear function.

[0104] In Figure 8, the height (Ha) of the first filling section 6a and the height (Hb) of the second filling section 6b corresponding to the graph in Figure 8(b) are shown as half the height (H) of one filling section 6 corresponding to the graph in Figure 8(a) (Ha = Hb = H / 2). Therefore, the combined height of the first filling section 6a and the second filling section 6b in Figure 8(b) is equal to the height of the filling section 6 in Figure 8(a). The same catalyst is packed as packing material at the same density in the packing section 6 in Fig. 8(a) and the first packing section 6a and the second packing section 6b in Fig. 8(b). Therefore, the amount of packing material used in the packing section 6 in Fig. 8(a) is equal to the sum of the amounts of packing material used in the first packing section 6a and the second packing section 6b in Fig. 8(b). For ease of understanding, the deodorizing principle will be explained using the configuration shown in Figure 8, but the relationship between the heights of the first filling section 6a and the second filling section 6b, the relationship between the densities of the catalysts contained in the filling sections, etc. are not limited to the above.

[0105] In Figure 8(b), the area indicated by arrow A shows the distribution of the drug component concentration in the first filling section 6a, and the area indicated by arrow B shows the distribution of the drug component concentration in the second filling section 6b. Figure 8(b) conveniently shows the distribution of the drug component concentration in the first filling section 6a and the second filling section 6b connected together, and the horizontal axis represents the integrated value of the distance within the first filling section 6a and the second filling section 6b, with the upper end surface of the first filling section 6a located at the top as the reference.

[0106] The concentration of the chemical component in the chemical solution 5 at the top end surface of the filling section 6 is equal to the concentration of the chemical component in the chemical solution 5 supplied from the chemical solution discharging section 4. However, as shown in Figure 8(a), the chemical component in the chemical solution 5 reacts with the odor component contained in the gas G inside the filling section 6, and therefore decreases with the distance from the top end surface of the filling section 6.

[0107] As shown in FIG. 8(b), the concentration of the chemical component in the chemical solution 5 at the upper end surface of the filling section 6a is equal to the concentration of the chemical component in the chemical solution 5 supplied from the first chemical solution discharging section 4a, but decreases with the distance from the upper end surface of the filling section 6a. The concentration of the chemical component in the chemical solution 5 at the upper end surface of the filling section 6a is equal to the concentration of the chemical component in the chemical solution 5 at the upper end surface of the filling section 6 shown in FIG. 8(a). On the other hand, since the height Ha of the first filling section 6a is smaller than the height H of the filling section 6 in Figure 8(a), the drug component concentration at the lower end surface (bottom surface) of the first filling section 6a is higher than the drug component concentration at the lower end surface of the filling section 6.

[0108] The second filling section 6b is supplied with new medicinal solution 5 from the second medicinal solution discharging section 4b. The dotted line La in Figure 8(b) indicates the concentration of the drug component of the drug solution 5 in the second filling section 6b when the drug solution 5 is not supplied from the second drug solution releasing section 4b but is supplied from the first drug solution releasing section 4a via the first filling section 6a, and the dotted line Lb in Figure 8(b) indicates the concentration of the drug component of the drug solution 5 in the second filling section 6b when the drug solution 5 is not supplied from the first drug solution releasing section 4a but is supplied from the second drug solution releasing section 4b. The solid line in region B of Figure 8(b) indicates the concentration of the chemical component of the chemical solution 5 in the second filling section 6b when the chemical solution 5 is supplied from the first chemical solution discharging section 4a and the second chemical solution discharging section 4b. In this case, the chemical solution 5 in the second filling section 6b is a mixture of the chemical solutions 5 indicated by the dotted line Lba and the dotted line Lb.

[0109] 8(a), suppose that a chemical solution 5 with a chemical component concentration of 400 [ppm] is supplied from the chemical solution releasing section 4 to the filling section 6, and the chemical component concentration at the top end surface (horizontal axis = 0) of the filling section 6 is 400 [ppm]. In the filling section 6, the chemical components of the chemical solution 5 react evenly with the odor components contained in the gas G, and the chemical component concentration at the midpoint of the filling section 6 (horizontal axis = H / 2 = Ha) is 250 [ppm], and the chemical component concentration at the bottom end surface (horizontal axis = H) of the filling section 6 is 100 [ppm].

[0110] 8(b), the chemical solution 5 having a chemical component concentration of 400 [ppm] is supplied from the first chemical solution discharging section 4a to the first filling section 6a, and the chemical component concentration at the upper end surface (horizontal axis = 0) of the first filling section 6a is 400 [ppm]. In the first filling section 6a, the chemical components of the chemical solution 5 react evenly with the odor components contained in the gas G, and the chemical component concentration at the lower end surface (horizontal axis = Ha), which is the bottom surface of the first filling section 6a, is 250 [ppm].

[0111] Furthermore, when the chemical solution 5 having a chemical component concentration of 400 [ppm] is supplied from the second chemical solution discharging section 4b to the second filling section 6b, it is mixed with the chemical solution 5 supplied from the first chemical solution discharging section 4a via the first filling section 6a to the second filling section 6b, and the chemical component concentration at the upper end surface (horizontal axis = Ha) of the second filling section 6b becomes 325 [ppm].In the second filling section 6b, the chemical components of the chemical solution 5 react evenly with the odor components contained in the gas G, and the chemical component concentration at the lower end surface (horizontal axis = Ha + Hb = H), which is the bottom surface of the second filling section 6b, becomes 175 [ppm].

[0112] Thus, compared to the deodorizing device 100 having one filling section 6 as shown in FIG. 1, the deodorizing device 100 having two filling sections (first filling section 6a and second filling section 6b) as shown in FIG. 7 is able to react the chemical solution 5 having a higher concentration of chemical components with the gas G. Generally, the rate of a chemical reaction depends on the concentration of the reactants, so the deodorizing efficiency of the gas G can be improved by increasing the actual concentration of the chemical components in the chemical solution 5 supplied into the two filling sections (first filling section 6a and second filling section 6b) which are the chemical reaction areas. Furthermore, the deodorizing device 100 having two filling sections (first filling section 6a and second filling section 6b) has a longer region in the filling section where the chemical component concentration of the chemical solution 5 is high along the flow direction of the gas G.

[0113] 7, it is possible to employ an operating method in which the chemical solution 5 is constantly supplied from both the first chemical solution discharger 4a and the second chemical solution discharger 4b to the first filling section 6a and the second filling section 6b during the deodorizing treatment, thereby performing the deodorizing treatment of the gas G. The flow rate of the chemical solution 5 supplied from the first chemical solution discharger 4a and the second chemical solution discharger 4b can be changed by the control device 33 in accordance with the concentration of odor components contained in the gas G measured by the detector S, as described in the first embodiment.

[0114] However, instead of constantly discharging the chemical solution 5 from both the first chemical solution discharger 4a and the second chemical solution discharger 4b, the deodorizing apparatus 100 may be operated in a manner that changes the control method for the first chemical solution discharger 4a and the second chemical solution discharger 4b according to the concentration of odor components contained in the gas G, as described below. As a result, the power cost of the deodorizing apparatus 100 can be reduced.

[0115] As shown in FIG. 3, under normal conditions where there is no sudden increase in the concentration of odorous components contained in gas G (when the concentration of odorous components is equal to or less than a preset threshold value (for example, the value set by the dotted line in FIG. 6)), chemical solution 5 is released only from first chemical solution release section 4a in the first reaction module, and chemical solution 5 is supplied to first filling section 6a and second filling section 6b, and the flow rate of chemical solution 5 is controlled according to the concentration of odorous components contained in gas G. In this case, the first filling section 6a and the second filling section 6b can be used as one filling section 6 shown in Fig. 1. That is, the same operational control as that of the deodorizing apparatus 100 of the first embodiment can be adopted. In this case, the chemical solution 5 is not discharged from the second chemical solution discharge section 4b in the second reaction module (the flow rate of the discharged chemical solution 5 is zero). That is, only the first chemical solution circulation pump 12a is operated, and the second chemical solution circulation pump 12b is not operated.

[0116] Then, when the concentration of odor components contained in the gas G suddenly increases (when the concentration of odor components exceeds a preset threshold as shown in region A in FIG. 6), the chemical solution 5 may be additionally supplied from the second chemical solution discharger 4b in the second reaction module, and the flow rate of the chemical solution 5 may be controlled according to the concentration of odor components contained in the gas G. That is, the first chemical solution circulation pump 12a and the second chemical solution circulation pump 12b are operated. In a normal state, the deodorizing device 100 is operated by operating only the first chemical liquid circulation pump 12a, so that an increase in power consumption can be prevented.

[0117] The control device 33 compares the concentration of the odorous components with a preset threshold value (for example, the value shown by the dotted line in Figure 6) and can control the supply flow rate of the chemical solution 5 to the first chemical solution releaser 4a and the second chemical solution releaser 4b as described above. Specifically, when the concentration of odorous components contained in the gas G is equal to or lower than a preset threshold, the chemical liquid 5 is not supplied to the second chemical liquid discharger 4b (the flow rate of the chemical liquid supplied to the second chemical liquid discharger 4b is set to zero), and the flow rate (supply flow rate) of the chemical liquid 5 discharged from the first chemical liquid discharger 4a is changed depending on the concentration of the odorous components detected by the detector S. When the concentration of the odorous component exceeds a predetermined threshold, the flow rate of the chemical solution 5 released from the first chemical solution releaser 4a can be set to a predetermined maximum value, and the flow rate of the chemical solution 5 released from the second chemical solution releaser 4b can be changed depending on the concentration of the odorous component detected by the detector S.

[0118] Alternatively, for simplicity, the flow rate of the chemical solution 5 supplied from at least one of the first chemical solution discharging portion 4a and the second chemical solution discharging portion 4b may be set to a constant flow rate.

[0119] The control device 33 can also control the supply of chemical liquid 5 to the second chemical liquid releaser 4b without supplying chemical liquid 5 to the first chemical liquid releaser 4a when the concentration of odor components contained in the gas G is equal to or lower than a predetermined threshold. However, in this case, the chemical liquid released from the second chemical liquid releaser 4b is supplied only to the second filling section 6b, not to the first filling section 6a, and the catalyst filled in the first filling section 6a is not effectively utilized. Therefore, it is preferable to control the release of chemical liquid from the first chemical liquid releaser 4a provided in the upper stage when the concentration of odor components is equal to or lower than a predetermined threshold. This also applies to other embodiments. The deodorizing device 100 may also include two or more reaction modules.

[0120] In either operating method, the concentration of chemical components in the chemical solution 5 on the surface of the filler (catalyst) is substantially increased in accordance with the concentration of odorous components without increasing the concentration of the chemical components in the chemical solution 5 in the circulating chemical solution tank 9 (or the circulating chemical solution 5), making it possible to immediately respond to a sudden increase in the concentration of odorous components, improving the utilization efficiency of the chemical solution used to deodorize odorous gases, and reducing increases in the running costs of the chemical solution 5. An increase in the actual chemical component concentration in the filling section (first filling section 6a and second filling section 6b) means that the chemical component concentration of the chemical solution 5 (or the circulating chemical solution 5) in the circulating chemical solution tank 9 can be reduced, and in this sense, the increase in the running costs of the chemical solution 5 can be reduced.

[0121] (Embodiment 3) In the third embodiment, by configuring the filling section 6 from multiple filling sections as shown in FIG. 7, it is possible to control the supply flow rate of the chemical solution 5 optimal for deodorization treatment over a wider range than in conventional deodorizing devices.

[0122] 9 shows the dependency of the angle (discharge angle or spray angle) at which the chemical solution 5 is discharged from the chemical solution discharge portion 4 on the flow rate of the chemical solution 5, and the hatched areas in FIG. 9 schematically show the main areas to which the chemical solution 5 is supplied. In FIG. 9, the flow rate (discharge amount) at which the chemical solution 5 is discharged increases in the order of FIG. 9(a), (b), and (c). For ease of understanding, the hatched areas in FIG. 9 are depicted in a simplified manner and do not limit the area to which the chemical solution 5 is supplied.

[0123] 9(a), when the discharge amount of the chemical liquid 5 is small and the discharge pressure is low, the discharge angle of the chemical liquid 5 indicated by 2θa in the figure is small, and there are parts of the filling section 6 where the chemical liquid 5 is not supplied or the supply flow rate is relatively low (areas indicated by arrows R in the figure). In other words, part of the catalyst filled in the filling section 6 is not supplied with the chemical liquid 5 substantially and is not effectively utilized. The deodorizing effect of the gas G passing through the area of ​​the filling section 6 where the chemical liquid 5 is not sufficiently supplied is reduced, and as a result, the deodorizing efficiency of the deodorizing device 100 is reduced.

[0124] Furthermore, as the amount of chemical solution 5 released increases and the release pressure increases, the release angle of the chemical solution 5 increases, and the area of ​​the chemical solution 5 sprayed on the upper end surface of the filling section 6 increases, so that, as shown in Figure 9(b), the area of ​​the chemical solution 5 sprayed on the upper end surface of the filling section 6 matches the area of ​​the upper end surface of the filling section 6. When the chemical solution 5 released from the chemical solution release section 4 has a release angle (2θb) shown in Figure 9(b), the chemical solution 5 is supplied (sprayed) on the upper end surface of the filling section 6 just enough, so that the catalyst filled in the filling section 6 can be used effectively in the deodorizing reaction. The geometric relationship between the release angle of the chemical solution 5 from the chemical solution release section 4, the radius (or area) of the upper end face of the filling section 6, and the distance between the chemical solution release section 4 and the upper end face of the filling section 6 can determine the chemical solution circulation flow rate conditions that efficiently promote the reaction between the chemical solution 5 sprayed on the catalyst surface contained in the filling section 6 and the odor components contained in the gas G.

[0125] Furthermore, when the amount of chemical solution 5 released increases and the release pressure increases, the release angle (2θc) of the chemical solution 5 increases as shown in FIG. 9(c), and the chemical solution 5 is sprayed over the entire upper end surface of the packed section 6, with an excessive amount of the chemical solution 5 being sprayed onto the wall surface Sw of the deodorization tower 1. The chemical solution 5 adhering to the wall surface Sw flows down along the wall surface Sw and may not be supplied to the surface of the catalyst packed in the packed section 6. As a result, the portion of the chemical solution 5 sprayed onto the wall surface Sw is not sufficiently supplied to the catalyst in the packed section 6, resulting in a decrease in deodorization efficiency.

[0126] In this manner, in the state shown in Figure 9(a), not only is the deodorizing efficiency reduced compared to the state shown in Figure 9(b) due to the reduced flow rate of the chemical solution 5, but the area over which the chemical solution is sprayed onto the filling section 6 is reduced, which further reduces the deodorizing efficiency. On the other hand, in the state shown in Figure 9(c), although the deodorizing efficiency increases compared to the state shown in Figure 9(b) due to the effect of increasing the flow rate of the chemical liquid 5, some of the chemical liquid 5 does not (sufficiently) benefit from the catalytic action of the filling section 6, and the increase in deodorizing efficiency due to the increase in the flow rate of the chemical liquid is slowed (limited). Therefore, it is possible to efficiently control the deodorizing ability near the flow rate of the chemical solution 5 (referred to as the "optimized flow rate") that can achieve the geometrical spray state of the chemical solution 5 shown in Figure 9(b). For example, the range of the flow rate of the chemical solution 5 is a flow rate control range (referred to as the "geometrically optimized flow rate range") that includes the geometrically optimized flow rate, and is preferably in the range of 0.8 to 1.2 times the geometrically optimized flow rate.

[0127] 10(a) and 10(b) are a perspective view and a cross-sectional view, respectively, which schematically show the release distribution of the drug solution 5 from the drug solution releasing portion 4 and the geometric relationship with the cylindrical filling portion 6. FIG.

[0128] 10(a) shows a situation in which the area of ​​the region where the medicinal liquid 5 is sprayed changes depending on the distance between the medicinal liquid releasing part 4 and the filling part 6. The figure shows a situation in which the area where the medicinal liquid 5 is sprayed expands with the distance from the medicinal liquid releasing part 4. At position Pb, the spray area (cross-sectional area) of chemical solution 5 on a plane parallel to upper end surface St of filling section 6 is equal to the area (area) of upper end surface St, which corresponds to the state shown in FIG. 9(b).

[0129] On the other hand, at position Pa, which is closer to the drug solution release section 4 than position Pb, the spray area (cross-sectional area) of the drug solution 5 on a surface parallel to the upper end surface St of the filling section 6 is smaller than the area (cross-sectional area) of the upper end surface St, which corresponds to the state shown in Figure 9(a). Furthermore, at position Pc, which is farther from the drug solution release section 4 than position Pb, the spray area (cross-sectional area) of the drug solution 5 on a surface parallel to the upper end surface St of the filling section 6 becomes larger than the area (area) of the upper end surface St, which corresponds to the state shown in Figure 9(c).

[0130] Fig. 10(b) shows the relationship between the discharge angle (2θ) of the liquid medicine 5 discharged from the liquid medicine discharging portion 4, the distance d from the liquid medicine discharging portion 4 to the upper end surface St of the filling portion 6, and the diameter (2r) of the upper end surface St of the filling portion 6, under the condition that the liquid medicine 5 from the liquid medicine discharging portion 4 is at a geometrically optimized flow rate. From Fig. 10(b), under the geometrically optimized flow rate condition, the relationship between θ and d and r is tan θ=r / d. Since the angle θ depends on the release amount, which is the supply flow rate of the chemical solution 5, the release amount of the chemical solution 5 can be determined from the above relational expression.

[0131] The above relational equation applies when the chemical solution 5 is released radially from one point on the chemical solution release section 4, but depending on the area of ​​the region where the chemical solution 5 is sprayed, the geometrically optimized flow rate can be determined as follows: That is, the geometrically optimized flow rate of the chemical solution 5 supplied from the chemical solution releasing portion 4 is a flow rate at which the area (cross-sectional area) of the region where the chemical solution 5 is sprayed on a plane parallel to the upper end surface St of the filling portion 6 is equal to the area of ​​the upper end surface St of the filling portion 6. Therefore, the geometrically optimized flow rate is not limited to the case where the chemical solution 5 is released radially from one point on the chemical solution releasing portion 4, and can be obtained for various releasing (spraying) methods, such as releasing the chemical solution 5 from multiple chemical solution releasing portions 4.

[0132] The relationship between the amount of chemical solution 5 released from chemical solution release section 4 and the deodorizing effect can also be measured from the relationship between the odor component concentration of gas G flowing into deodorization tower 1 and the odor component concentration of gas G discharged from deodorization tower 1. For example, an additional detector S (gas sensor) is installed at outlet 8, gas G with a known, constant odor component concentration is experimentally introduced, the amount of chemical solution 5 released from chemical solution release section 4 is changed, and the odor component concentration of gas G at the outlet of deodorization tower 1 is measured. It is also possible to measure the dependency of the odor component concentration at the outlet side on the amount of chemical solution 5 released, and then actually measure the optimized flow rate from the dependency of the rate of decrease in odor component concentration on the amount of chemical solution 5 released. The above-described method for measuring the deodorizing effect can also be applied to other embodiments.

[0133] 7, by configuring the filling section 6 in two stages, the first filling section 6a and the second filling section 6b, there are a first geometrically optimized flow rate determined by the relationship between the first chemical solution discharging section 4a and the first filling section 6a and a second geometrically optimized flow rate determined by the relationship between the second chemical solution discharging section 4b and the second filling section 6b, respectively. As a result, the flow rate range of the chemical solution 5 that efficiently deodorizes the odorous components contained in the gas G can be expanded.

[0134] The recording device (or an external recording device) of the control device 33 of the deodorizing device 100 records the above-mentioned first geometrically optimized flow rate and a first geometrically optimal flow rate range including it, as well as the above-mentioned second geometrically optimized flow rate and a second geometrically optimal flow rate range including it. The control device 33 controls the first chemical liquid circulation pump 12a and the second chemical liquid circulation pump 12b to control the flow rate of the chemical liquid 5 supplied from the first chemical liquid discharge section 4a and the second chemical liquid discharge section 4b within the first geometric optimum flow rate range and the second geometric optimum flow rate range according to the concentration of odorous components contained in the gas G detected by the detector S.

[0135] For example, the control device 33 can cause the chemical solution 5 to be supplied to the first filling section 6a and the second filling section 6b simultaneously from both the first chemical solution discharging section 4a and the second chemical solution discharging section 4b. As described in the first embodiment, the control device 33 can change the flow rates of the chemical liquid 5 supplied from the first chemical liquid discharger 4a and the second chemical liquid discharger 4b within the first geometrically optimal flow rate range and the second geometrically optimal flow rate range depending on the concentration of the odor component input from the detector S. Therefore, the deodorizing device 100 can improve the utilization efficiency of the chemical liquid used for deodorizing the odorous gas, and can perform the deodorizing treatment of the gas G more efficiently.

[0136] Furthermore, as will be described below, the control device 33 may control the supply of the chemical solution 5 from one or both of the first chemical solution releasing part 4a and the second chemical solution releasing part 4b according to the concentration value of the odor component contained in the gas G. As a result, the power cost of the deodorizing device 100 can be reduced.

[0137] The control device 33 compares the concentration of the odorous components input from the detector S with a preset threshold value, and if the concentration of the odorous components is equal to or lower than the preset threshold value, operates and controls only the first chemical liquid circulation pump 12a, thereby supplying the chemical liquid 5 from only the first chemical liquid discharge section 4a to the first filling section 6a. Specifically, the control device 33 controls the first chemical liquid circulation pump 12a to control the flow rate of the chemical liquid 5 supplied from the first chemical liquid release section 4a to the first filling section 6a within a flow rate range including the geometrically optimized flow rate for the first filling section 6a (first geometrically optimized flow rate range, for example, a range of 0.8 to 1.2 times the first geometrically optimized flow rate) according to the concentration of the detected odor component. The chemical solution 5 is not supplied from the second chemical solution discharger 4b.

[0138] Here, the preset threshold value of the concentration of odorous components can be, for example, a value equal to or less than the concentration of odorous components that the deodorizing treatment device 100 can deodorize when the chemical solution 5 is supplied from the first chemical solution discharge section 4a at the maximum value of the first geometrically optimal flow rate range (for example, 1.2 times the first geometrically optimal flow rate), but is not limited to this.

[0139] The control device 33 compares the concentration of the odor component input from the detector S with a preset threshold value, and if the concentration of the odor component input from the detector S is greater than the preset threshold value, it controls the first chemical liquid circulation pump 12a and the second chemical liquid circulation pump 12b to supply the chemical liquid 5 from the first chemical liquid release section 4a and the second chemical liquid release section 4b to the first filling section 6a and the second filling section 6b. Specifically, the control device 33 controls the first chemical liquid circulation pump 12a to supply the chemical liquid 5 at the maximum flow rate within a first geometrically optimal flow rate range from the first chemical liquid discharge section 4a to the first filling section 6a, and controls the second chemical liquid circulation pump 12b to control the flow rate of the chemical liquid 5 supplied from the second chemical liquid discharge section 4b to the second filling section 6b within a second geometrically optimal flow rate range in accordance with the concentration of the detected odorous components. For example, the flow rate of the chemical liquid 5 flowing in from the first chemical liquid discharger 4a is set to 1.2 times the first geometrically optimized flow rate, and the flow rate of the chemical liquid 5 flowing in from the second chemical liquid discharger 4b is controlled within a second geometrically optimized flow rate range (for example, 0.8 to 1.2 times the second geometrically optimized flow rate) according to the concentration of the detected odor component (or the value obtained by subtracting a preset threshold from the concentration of the detected odor component).

[0140] Alternatively, for simplicity, the flow rate of the chemical solution 5 supplied from at least one of the first chemical solution discharging portion 4a and the second chemical solution discharging portion 4b may be set to a constant flow rate. For example, the liquid medicine 5 may be discharged at a constant flow rate from both the first liquid medicine discharging portion 4a and the second liquid medicine discharging portion 4b. If the concentration of the odor component input from the detector S is equal to or lower than a preset threshold, the chemical solution 5 is supplied to the first filling section 6a at a constant flow rate within the range of the geometrically optimal flow rate for the first filling section 6a only from the first chemical solution discharge section 4a, and if the concentration of the odor component input from the detector S exceeds the preset threshold, the chemical solution 5 is further supplied to the second filling section 6b from the second chemical solution discharge section 4b at a constant flow rate within the range of the geometrically optimal flow rate for the second filling section 6b, and the chemical solution 5 may be supplied to the first filling section 6a and the second filling section 6b from the first chemical solution discharge section 4a and the second chemical solution discharge section 4b.

[0141] By configuring the filling section 6 with a plurality of filling sections (the first filling section 6a and the second filling section 6b) in this way, the chemical solution 5 can be supplied to the plurality of filling sections (the first filling section 6a and the second filling section 6b) over a wide range of geometrically optimal flow rates, thereby improving the deodorizing efficiency of the deodorizing device 100. Since the chemical solution 5 can be used efficiently, the running cost of the chemical solution 5 can be reduced. The control of the supply flow rate of the chemical liquid within the geometrically optimum flow rate range is also applicable to the first embodiment.

[0142] In the above-mentioned second and third embodiments, an example of a deodorizing apparatus 100 including two filling sections, the first filling section 6a and the second filling section 6b, has been described, but the filling section may be composed of three or more filling sections, and a chemical solution discharge section may be provided directly above each filling section. That is, a combination of one filling section and one chemical solution discharge section located directly above it inside the deodorizing tower 1 may be used as one reaction module, and two or more reaction modules may be stacked in multiple stages and provided above the circulating chemical solution tank 9. The control device 33 controls the supply flow rate of the chemical solution 5 for the multiple reaction modules stacked in multiple stages, in order from the top module to the bottom module, using a preset threshold value that is one less than the number of reaction modules.

[0143] For example, a first, second, and third reaction module may be configured, each including a first filling unit 6a, a second filling unit 6b, and a third filling unit 6c arranged in order from top to bottom, and a first liquid chemical discharging unit 4a, a second liquid chemical discharging unit 4b, and a third liquid chemical discharging unit 4c corresponding thereto. Then, the concentration of odor components input from the detector S is sequentially compared with two preset thresholds, a first threshold and a second threshold (>first threshold).

[0144] When the concentration of the odor component is equal to or less than the first threshold value, the first reaction module is selected as the reaction module that supplies the chemical solution, and the chemical solution 5 is supplied only from the first chemical solution discharger 4a in the first reaction module.

[0145] When the concentration of the odor component is greater than the first threshold and less than the second threshold, the first reaction module and the second reaction module are selected as the reaction modules to supply the chemical solution, and the chemical solution 5 is supplied only from the first chemical solution discharger 4a in the first reaction module and the second chemical solution discharger 4b in the second reaction module.

[0146] When the concentration of the odor component is greater than the second threshold value, the first reaction module, the second reaction module, and the third reaction module are selected as the reaction modules to supply the chemical solution, and the chemical solution 5 is supplied from the first chemical solution discharger 4a in the first reaction module, the second chemical solution discharger 4b in the second reaction module, and the third chemical solution discharger 4c in the third reaction module.

[0147] That is, a reaction module that releases the chemical solution 5 from the chemical solution releasing section is selected from among a plurality of reaction modules according to the concentration of the odor component, and the number of reaction modules to which the chemical solution is supplied is increased sequentially as the concentration of the odor component increases. In this case, in order to effectively utilize the catalyst filled in the filling section, the reaction modules provided in the upper row are selected in order as the concentration of the odor component increases, and the chemical solution is supplied to the selected reaction modules in sequence. Conversely, if the concentration of odorous components contained in gas G decreases, the reaction modules installed in the lower tier are selected in order as the concentration of odorous components decreases, and the supply of chemical solution to the selected reaction module is stopped. Therefore, when performing deodorization treatment, chemical solution is always supplied to the reaction module installed in the uppermost tier. The control device 33 controls the first chemical liquid circulation pump 12a, the second chemical liquid circulation pump 12b, and the third chemical liquid circulation pump 12c corresponding to the first chemical liquid discharge section 4a, the second chemical liquid discharge section 4b, and the third chemical liquid discharge section 4c, thereby controlling the operation of each (first, second, and third) reaction module.

[0148] (Verification of deodorizing effect) An experiment was conducted to compare the operating costs of the conventional deodorizing device 99 and the deodorizing device 100 according to the present invention. As shown in Fig. 11, the introduced gas G containing odorous components is branched into two, the air volume of which is adjusted by valves V1 and V2, and the gas is introduced into a conventional deodorizing device 99 and a deodorizing device 100 according to the present invention. The deodorized gas G is released into the atmosphere by a fan F. The deodorizing device 99 used chemical solutions of hypochlorous acid (NaOCl) and NaOH, and the deodorizing device 100 used an electrolytic cell to control hypochlorous acid and chemical solutions of NaCl and NaOH.

[0149] As described above, gas detectors Si and So are installed on the inlet and outlet sides of each of the deodorizing devices 99 and 100, respectively, to measure the odor component concentrations of the gas G after deodorization. The optimal operating conditions for the deodorizing devices 99 and 100 are determined using the measurements of the gas detectors Si and So. 11, the odor component concentration of gas G is measured by a gas detector Si on the inlet side. The odor component concentration of gas G deodorized by a deodorizing device 99 is measured by a gas detector So1 on the outlet side of the deodorizing device 99, and the odor component concentration of gas G deodorized by a deodorizing device 100 is measured by a gas detector So2 on the outlet side of the deodorizing device 100.

[0150] Gas detectors Si1 and Si2 may be provided on the inlet sides of the deodorizing device 99 and the deodorizing device 100, respectively, to measure the odor component concentrations of the gas G after deodorization by the deodorizing device 99 and the deodorizing device 100. The operation of the deodorizing device 100 is controlled using the measured values ​​of the odor component concentrations of the gas detector Si2 (or gas detector Si).

[0151] For the purpose of the comparative test, the flow rate of gas G in deodorizing device 99 and deodorizing device 100 was set to the same (1.05 [m / s]), and the ratio of the amount of sprayed chemical solution to the air volume of gas G ([amount of sprayed chemical solution] / [air volume of gas G]) was also set to the same, and deodorization processing of gas G was performed under the optimal conditions of deodorizing device 99 and deodorizing device 100.

[0152] As shown below as examples of measurement results (measurements taken on two different days), the deodorizing devices 99 and 100 were operated under conditions that allowed the odor components of the gas G to be sufficiently removed.

[0153] (Measurement example 1) Measurement date: September 17, 2020 Measurements using the inlet detector Si confirmed that the concentrations of the odorous components of gas G, methyl mercaptan, hydrogen sulfide, methyl sulfide, and methyl disulfide, were 0.28, 6.4, 0.032, and 0.02 ppm, respectively. Measurements using detector So1 on the outlet side of deodorization device 99 revealed that the concentrations of methyl mercaptan, hydrogen sulfide, methyl sulfide, and methyl disulfide in gas G after deodorization treatment were less than 0.005 ppm, 0.001 ppm, less than 0.001 ppm, and less than 0.001 ppm, respectively. Measurements using detector So2 on the outlet side of deodorizing device 100 revealed that the concentrations of methyl mercaptan, hydrogen sulfide, methyl sulfide, and methyl disulfide in gas G after deodorization were less than 0.005 ppm, less than 0.001 ppm, less than 0.001 ppm, and less than 0.001 ppm, respectively.

[0154] (Measurement example 2) Measurement date: October 21, 2020 Measurements using the inlet detector Si confirmed that the concentrations of the odorous components of gas G, methyl mercaptan, hydrogen sulfide, methyl sulfide, and methyl disulfide, were 0.14, 5.2, 0.023, and 0.017 ppm, respectively. Measurements using detector So1 on the outlet side of deodorization device 99 revealed that the concentrations of methyl mercaptan, hydrogen sulfide, methyl sulfide, and methyl disulfide in gas G after deodorization were less than 0.005 ppm, 0.003 ppm, 0.001 ppm, and 0.001 ppm, respectively. Measurements using detector So2 on the outlet side of deodorizing device 100 revealed that the concentrations of methyl mercaptan, hydrogen sulfide, methyl sulfide, and methyl disulfide in gas G after deodorization were less than 0.005 ppm, less than 0.001 ppm, less than 0.001 ppm, and less than 0.001 ppm, respectively.

[0155] 12 is a graph illustrating the changes over time in the hypochlorous acid concentration (A in the figure), the average inlet hydrogen sulfide concentration (B in the figure), and the chemical solution discharge amount (C in the figure) of the deodorizing device 100 from midnight on September 18, 2020 to midnight on September 26, 2020. The horizontal axis represents the date and time, the left vertical axis represents the chemical solution discharge amount [cc / min] or the hydrogen sulfide concentration [ppm], and the right vertical axis represents the hypochlorous acid concentration [ppm]. Note that Figure 12 is essentially a graph showing the same changes over time as Figure 5, but the scale of the axes in the graph in Figure 5 has been adjusted for visibility, so the scale of the vertical axis in particular is different from that of the graph in Figure 12.

[0156] In order to confirm the running cost reduction effect of the deodorizing device 100, the deodorizing process of gas G was carried out for 15 days in the deodorizing device 99 and the deodorizing device 100, and the operating costs (costs of each chemical solution and electricity) per 1 m3 of deodorizing air volume were calculated and compared. As a result, it was confirmed that the processing cost of the deodorizing device 100 of the present invention was 0.39 times (a 61% reduction) the processing cost of the conventional deodorizing device 99, and that the deodorizing device 100 can achieve significant cost reductions.

[0157] (Odor component concentration measurement unit) In order to confirm the deodorizing effect of the deodorizing device, a measurement unit 50 will be described which can easily measure the concentration of odor components in the gas G. As will be described below, the measurement unit 50 can operate a detector and collect measurement data from the detector.

[0158] By providing gas detectors Si and So on the inlet and outlet sides of the deodorizing apparatus 100, the effectiveness of the deodorizing treatment can be confirmed. Specifically, as shown in FIG. 13, the inlet gas detector Si is installed at the inlet 2 of the first pipe 3 for gas G, and the outlet gas detector So is installed at the outlet 8 of the deodorizing tower 1 for gas G. The inlet gas detector Si (hereinafter sometimes referred to as the first gas detector S1) and the outlet gas detector So (hereinafter sometimes referred to as the second gas detector S2) are electrically connected to the measurement unit 50 by signal lines 34a and 34b, and output signals from the inlet gas detector Si and the outlet gas detector So are input to the measurement unit 50. Furthermore, power is supplied to the inlet gas detector Si and the outlet gas detector So from the measurement unit 50 via the signal lines 34a and 34b. An exhaust duct may be further provided at the outlet 8, and an outlet-side gas detector So may be installed in the exhaust duct.

[0159] The inlet side gas detector Si and the outlet side gas detector So may be provided with detector ports in the pipe for introducing gas G into the deodorizing device 100 and the pipe for discharging the treated gas G, and may be installed so that each detector Si and So can be detachably attached with screws or the like so that they can be replaced. Furthermore, when the detectors Si and So are removed, it is possible to attach a stopper plug to the detector port with a screw or the like.

[0160] 14A and 14B are diagrams specifically illustrating an example of the configuration of the measurement unit 50. Fig. 14A shows a circuit configuration diagram of the measurement unit 50, Fig. 14B is an external plan view of the measurement unit 50, and Fig. 14C is an external perspective view of the measurement unit 50.

[0161] As shown in Figure 14(a), a housing 51 equipped with a power supply connector 52 and detector connectors 53a and 53b has inside it a leakage breaker ELB, DC power supplies DC1 and DC2, a data logger DL, changeover switches SW1 and SW2, and detector control circuits CTL1 and CTL2.

[0162] The earth leakage breaker (ELB) is a safety device that detects electrical leakage and cuts off the power supply.

[0163] The data logger DL and the DC power supplies DC1 and DC2 are supplied with power from an external AC power supply PW via a power supply connector 52 and an earth leakage breaker ELB. The DC power supplies DC1 and DC2 convert AC power supplied via a power supply connector 52 into DC power, and supply the DC power to the control circuits CTL1 and CTL2.

[0164] The control circuits CTL1 and CTL2 are connected to the first and second detectors S1 and S2 installed in the deodorizing device 100 via detector connectors 53a and 53b, supply power to the first and second detectors S1 and S2, receive output signals (detection signals) from the first and second detectors S1 and S2 via input signal lines SLI1 and SLI2, and output output signals as odor component concentration data to the data logger DL via output signal lines SLO1 and SLO2 and changeover switches SW1 and SW2.

[0165] The data logger DL has a plurality of input channels for inputting signals, and the analyzable range can be set appropriately for each input channel. The changeover switches SW1 and SW2 can select the input channel to the data logger DL according to the output signal levels of the first and second detectors S1 and S2. Therefore, the changeover switches SW1 and SW2 can select the input channel to the data logger DL according to the concentration level (low or high) of odor components contained in the gas G, making it possible to measure the odor component concentration appropriately and accurately.

[0166] The data logger DL is equipped with a processing unit, a recording device, and a display screen (display device), and can store signals (detection signals) related to the odor component concentrations of each detector S1, S2 input via signal lines as data in the recording device and can also display them as graphs on the display screen. For example, the data logger DL can display the change in odor component concentration over time on the display screen in real time. A commercially available data logger equipped with a display device can be used as the data logger DL. Note that the data logger DL storing the detection signal as data in a recording device means, for example, digitizing the detection signal (analog signal) input via a signal line and recording (saving) it in the recording device. However, if the detection signal input by the data logger DL is a digital signal, it can also be recorded in the recording device without digitization processing.

[0167] The number of detectors S connected to the measurement unit 50 is not limited to two. By preparing a combination of DC power supplies DC1 (DC2), selector switches SW1 (SW2), and control circuits CTL1 (CTL2) according to the number of detectors S, any number of detectors S (one or more) can be connected to the measurement unit 50 and measurement data of the detectors S can be collected.

[0168] 14(b), the housing 51 has a power supply connector 52 and detector connectors 53a and 53b on its side, and a window 54 on its top. A transparent plate is fixed to the opening of the window 54. The display screen of the data logger DL can be seen (checked) through the window 54. 14(c), the housing 51 is shaped like an attaché case (a box-shaped bag) and is composed of a main body 55 (storage section) and a lid 56. The earth leakage breaker ELB, DC power supplies DC1 and DC2, data logger DL, changeover switches SW1 and SW2, and control circuits CTL1 and CTL2 are stored in the main body 55. The power supply connector 52 and detector connectors 53a and 53b are provided in the main body, and a window 54 is provided in the lid 56. With the cover 56 open relative to the main body 55, the changeover switches SW1, SW2, etc. can be operated.

[0169] The front surface of the main body 55 is provided with a handle 57 and a fastener 58 (locking mechanism), and the main body 55 and the lid 56 can be releasably fixed together by the fastener 58. The back surfaces of the main body 55 and the lid 56, which face the front surfaces thereof, are provided with hinges (not shown), and the main body 55 and the lid 56 are supported by the hinges so as to be rotatable (openable and closable). With the main body 55 and the lid 56 fixed together by the fastener 58, the worker can grasp the handle 57 and carry the device.

[0170] A power line can be connected to the power connector 52, and detectors S1 and S2 can be connected to the detector connectors 53a and 53b. Therefore, with the lid 56 closed, the odor component concentrations can be measured using the detectors S1 and S2, and the measured values ​​can be converted into data by the data logger DL, recorded and stored as a log. Furthermore, the odor component concentration measurement data can be visualized and confirmed on the display device of the data logger DL through the window 54. The display device may be provided independently of the data logger DL and housed in the housing 51. Power for the separately provided display device can be supplied via the earth leakage breaker ELB. The lid 56 has the effect of covering and protecting the various components housed therein (earth leakage breaker ELB, data logger DL, etc.), thereby preventing the components housed therein from being damaged in an accident when measuring the concentration of odorous components in gas G.

[0171] The measuring unit 50 is not limited to the above-described embodiment, but the measuring unit 50 of the above-described embodiment has components integrated into an attaché case-like housing 51, making it compact and portable. Therefore, the odor component concentration of the gas G can be easily measured by connecting the measurement unit 50 to the detector S (S1, S2) of the deodorizing device 100 as needed. The measurement unit 50 can also be used in conventional deodorizing devices, and can be easily applied to existing deodorizing devices.

[0172] As described above, by configuring the measurement unit 50 as an independent, portable unit rather than being built into the deodorizing device, one (same) measurement unit 50 can be used for multiple deodorizing devices or deodorizing devices installed in different locations, and can also be used for deodorizing device maintenance, status diagnosis, performance comparison, optimization of deodorizing conditions, detector calibration, etc. Therefore, it can be used not only by deodorizing treatment companies, but also by deodorizing device manufacturers, maintenance service companies, and environmental investigation companies. The above-mentioned portable measurement unit 50 can be used for a variety of purposes and applications.

[0173] (Deodorizing device) The deodorizing device according to the present invention comprises: a deodorization tower for mixing the odorous gas with a chemical solution; A chemical solution discharge unit installed inside the deodorization tower; a detector for measuring the concentration of odorous components contained in the odorous gas flowing into the deodorization tower; a chemical solution supplying device that supplies the chemical solution to the chemical solution discharging portion; a chemical solution discharge device that discharges the chemical solution to the outside; a control device for controlling the chemical solution supply device and the chemical solution discharge device, The control device The amount of chemical solution discharged is controlled based on the concentration of odorous components output by the detector. In the above configuration 1, the concentration of the odor component may be an integrated value of the concentration over a predetermined period of time. In any of the above configurations 1. and 2., the flow rate of the chemical liquid to the chemical liquid release section may be controlled based on the concentration of the odor component output by the detector. Furthermore, in any of the above configurations, a filling section provided with a filler is further provided, and the filling section and the chemical solution discharge section constitute a reaction module, A plurality of the reaction modules are provided inside the deodorization tower, The control device may be configured to control the flow rate of the chemical liquid to each of the chemical liquid release portions based on the concentration of the odor component output by the detector. In any of the above configurations, the detector measures the concentration of odor components at a predetermined sampling period, The control device may be configured to integrate the concentration of the odor component output by the detector at a time interval longer than the sampling period. In any one of the above configurations, a chemical component supply device is provided that supplies a chemical component to the chemical solution, the control device controls the drug component supply device; The amount of the chemical component to be supplied to the chemical solution may be controlled based on the concentration of the odor component output by the detector. In any of the above configurations, the chemical component may be sodium hypochlorite, and the chemical component supply device may be configured to include an electrolytic cell. (Deodorization method) The deodorizing method according to the present invention is a deodorizing method in which an odorous gas containing odorous components is deodorized by reacting it with a chemical solution in a deodorizing tower, a step of measuring the concentration of odorous components contained in the odorous gas flowing into the deodorization tower with a detector; The amount of chemical solution discharged from the deodorization tower is controlled based on the concentration of the odorous components. The above-mentioned configuration may further include a step of controlling the flow rate of the chemical solution released into the deodorization tower based on the concentration of the odorous component measured by the detector. In any of the above configurations, the method may further include a step of controlling the amount of sodium hypochlorite to be supplied to the chemical solution based on the concentration of the odor component measured by the detector. In the above configuration, a filling section provided with a filler is further provided, and the filling section and the chemical solution discharge section constitute a reaction module, A plurality of the reaction modules are provided inside the deodorization tower, The method may be configured to include a step of supplying the chemical solution to the chemical solution discharge portion of the reaction module selected based on the concentration of the odor component measured by the detector. Furthermore, the above-mentioned configuration 11 may be configured to include a step of controlling the flow rate of the chemical solution discharged from the chemical solution discharging portion within a geometrically optimum flow rate range. [Industrial Applicability]

[0174] As described above, the measurement unit that can be attached to the deodorizing device of the present invention can be used not only by deodorizing treatment companies, but also by deodorizing device manufacturers, maintenance service companies, and environmental survey companies, and has great industrial applicability. [Explanation of symbols]

[0175] 100 Deodorizing device 1 Deodorizing tower 2 Gas inlet 3. First Pipe 3a Open end 4. Chemical solution discharge section 4a First chemical solution discharge section 4b Second chemical solution discharge section 5. Chemical Solution 6 Filling section 6a First filling section 6b Second filling section 7 Demister 8 Outlet 9 Circulating chemical tank (chemical storage section) 10 First outlet (circulation outlet) 10a First circulation outlet 10b Second circulation outlet 11 Second piping 11a, 11b piping 12 First pump (chemical liquid supply device) 12a First chemical liquid circulation pump 12b Second chemical circulation pump 13 Third Pipe 13a, 13b piping 14 Branch 15 Fourth Pipe 16 Fifth Pipe 17 Introduction 17a First entrance 17b Second entrance 18 Flow meter 18a First flow meter 18b Second flow meter 19 pH meter 20 Hypochlorous Acid Concentration Meter 21 Introduction 22 Second outlet (external outlet) 23 Sixth Pipe 24 Second pump (chemical discharge device) 25 Drain 26 Chemical (sodium hypochlorite) supply device 27 Seventh Pipe 28 Introduction 29 Tank 30 8th Pipe 31 Introduction 32 Third pump (alkaline solution supply pump) 33 Control device 34, 34a, 34b: First signal line (sensor signal line) 35 Second signal line (flow meter signal line) 35a First flow meter signal line 35b Second flow meter signal line 36 Third signal wire (pH meter signal wire) 37 Fourth signal line (concentration meter signal line) 38 Fifth Signal Line 39 6th signal line 40 Seventh Signal Line 41 8th signal line 50 measurement units 51 Case 52 Power connector 53a, 53b Detector connector 54 Window (Opening) 55 Main body 56 Lid 57 Toride 58 Fastener (locking mechanism) 261 Electrolytic cell 262 Pump 263 Third Outlet 264 Piping G Gas (gas to be treated) S, S1, S2 detectors Si, Si1, Si2 inlet gas detector So, So1, So2 outlet gas detector DC1, DC2 DC power supply CTL1, CTL2 control circuit DL Data Logger ELB earth leakage breaker SW1, SW2 selector switch

Claims

1. The inlet concentration of the odorous components of the odorous gas flowing into the deodorization tower of the deodorization device is measured by a detector installed on the inlet side of the deodorization tower, and the time change of the inlet concentration is recorded. A method for determining the operating conditions of a deodorizing device, which determines the concentration of a chemical component to be mixed with the odorous gas for deodorization in the deodorizing tower of the deodorizing device and the amount of a chemical solution containing the chemical component to be released into the deodorizing tower based on a threshold value previously set for the inlet concentration.

2. When the inlet concentration is higher than the threshold, the release amount of the chemical solution is kept constant and the concentration of the chemical component is changed according to the inlet concentration, or when the inlet concentration is lower than the threshold, the release amount of the chemical solution is changed according to the inlet concentration. The method for determining operating conditions according to claim 1.

3. 3. The method according to claim 1, wherein the measuring and the recording are both performed by a portable measuring unit.

4. 3. The method according to claim 1, wherein the inlet concentration is any one of a real-time concentration, an integrated value, and an average value over a predetermined period.

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