Deodorization system, deodorization tower monitoring unit, and activated carbon consumption monitoring method

Abstract

To provide a deodorization system capable of contributing to reduce running cost relating to activated carbon that is an absorbent of an odorous component.SOLUTION: A deodorization system comprises: a deodorization tower that deodorizes a gas containing a plurality of odorous components; a gas detector; and a monitoring device. The deodorization tower has an adsorption layer, the adsorption layer is equipped with activated carbon that adsorbs the odorous components of the gas, and the gas detector outputs a concentration measurement value of a first odor component in the gas flowing into the deodorization tower. The monitoring device inputs the concentration measurement value at a predetermined time interval, calculates a first activated carbon consumption amount due to the first odor component, calculates a semi-activated carbon consumption amount due to odor components not detected by the gas detector using the first activated carbon consumption amount and the odor component content ratio of the gas, and monitors the amount of change in activated carbon consumption from the first activated carbon consumption amount and the semi-activated carbon consumption amount.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a deodorization system for deodorizing an odorous gas containing a plurality of odorous components, a monitoring unit for a deodorization tower, and a method for monitoring the amount of activated carbon consumed in a deodorization tower. [Background technology]

[0002] Gases discharged from sewage treatment plants, human waste treatment plants, garbage disposal plants, etc. contain odorous components such as hydrogen sulfide. As methods for deodorizing such exhaust gases, dry deodorization methods and wet deodorization methods are known. A widely used dry deodorization method is to place an activated carbon layer inside a deodorization tower and adsorb odorous substances onto the activated carbon (activated carbon adsorption method). The wet deodorization method is a method in which a chemical solution is circulated in a deodorization tower and the chemical solution reacts with the odorous components to chemically remove the odorous components. Even in the wet deodorization method, the efficiency of removing odorous components can be further increased by providing a deodorization tower equipped with an activated carbon layer in the downstream stage and combining it with the dry deodorization method.

[0003] The activated carbon adsorption method works by capturing odorous components on the surface and in the pores of the activated carbon, so once the activated carbon layer breaks through (i.e. exceeds the allowable permeation concentration and no more odorous components are captured), the deodorizing effect can no longer be achieved, and so the activated carbon must be replaced periodically. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 55-142523 A (Figure 5) [Patent Document 2] Japanese Patent Application Publication No. 52-88584 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the concentration (amount) of odorous components discharged from the equipment to be deodorized may fluctuate. If the concentration of odorous components becomes greater than expected at the design stage of the activated carbon amount, the time until the activated carbon layer breaks through becomes shorter, and the risk of odorous components being discharged from the deodorizing device increases. If such a situation is assumed and the replacement cycle of the activated carbon is set to be short enough to allow for a sufficient margin of time before the breakthrough is reached, the risk of emitting odorous components will be reduced, but the amount of unadsorbed activated carbon will increase. As a result, usable activated carbon will be replaced unnecessarily, leading to an increase in the running costs of the deodorizing device.

[0006] An object of the present invention is to provide a deodorization system that can contribute to reducing the running costs of a deodorizing device, particularly the activated carbon that is an adsorbent for odorous components. [Means for solving the problem]

[0007] The deodorizing system according to the present invention comprises: The present invention is provided with a deodorization tower for deodorizing a gas containing a plurality of odorous components, a gas detector, and a monitoring device, The deodorization tower has an adsorption layer, The adsorption layer is equipped with activated carbon that adsorbs odorous components of the gas, The gas detector outputs a concentration measurement value of a first odor component in the gas flowing into the deodorization tower; The monitoring device, at a predetermined time interval, The concentration measurement value is input, and a first activated carbon consumption amount due to the first odor component is calculated, Calculating the consumption of semi-activated carbon due to odor components not detected by the gas detector using the consumption of the first activated carbon and the odor component content ratio of the gas; The method is characterized in that a change in the consumption of activated carbon in the adsorption bed is monitored based on the consumption of the first activated carbon and the consumption of the semi-activated carbon.

[0008] Further, the deodorizing system according to the present invention has the above-mentioned configuration, The monitoring device may calculate, from the amount of change in activated carbon consumption, an amount of change in length of a saturated region of the activated carbon loaded in the adsorption bed during the specified time interval.

[0009] By using this deodorization system, the consumption of activated carbon installed in the adsorption layer of the deodorization tower that deodorizes gas containing multiple odorous components can be monitored at a predetermined time interval to monitor the change in consumption due to gas. As a result, the consumption status of activated carbon and the transition of the saturation region can be grasped at any time, which contributes to reducing the running cost of the adsorption layer.

[0010] Further, the deodorizing system according to the present invention has the above-mentioned configuration, The monitoring device is characterized in that it integrates the amount of change in the length of the saturated region, calculates the total length of the saturated region in the activated carbon in the adsorption layer, and issues an alarm when the total length of the saturated region becomes equal to or greater than a threshold value.

[0011] With such a deodorizing system, the operator can be notified by a warning when it is time to replace the activated carbon.

[0012] The monitoring unit according to the present invention comprises: This is a monitoring unit for a deodorization tower that uses activated carbon to deodorize gas containing multiple odorous components. The monitoring unit includes a gas detector and a monitoring device. The monitoring device stores a content ratio of odor components contained in the gas, The gas detector outputs a concentration measurement value of a first odor component in the gas; The monitoring device inputs the concentration measurement value at a predetermined time interval, calculates a first activated carbon consumption amount of the activated carbon consumed by the first odor component, and Calculating the amount of semi-activated carbon consumed by the odor components detected by the gas detector using the first activated carbon consumption amount and the content ratio of the odor components contained in the gas; The method is characterized in that an amount of change in activated carbon consumption of the activated carbon is calculated from the amount of first activated carbon consumption and the amount of semi-activated carbon consumption.

[0013] By configuring the monitoring unit in this way, it is possible to apply the monitoring unit to an existing deodorization tower and grasp the amount of activated carbon consumed by odorous components.

[0014] The method for monitoring activated carbon consumption according to the present invention comprises the steps of: A method for monitoring consumption of activated carbon mounted in an adsorption layer of a deodorization tower for deodorizing a gas containing a plurality of odorous components, At a given time interval, A step 1 of acquiring a concentration measurement value of a first odor component contained in the gas measured by a gas detector; A step 2 of calculating an adsorption mass of the first odor component adsorbed on the activated carbon from the concentration measurement value; A step 3 of calculating a first activated carbon consumption amount due to the first odor component from the adsorption mass of the first odor component and the equilibrium adsorption amount of the first odor component; A step 4 of calculating the semi-activated carbon consumption of each of the undetectable odor components that are not detectable by the gas detector from the first activated carbon consumption and the content ratio and equilibrium adsorption amount of each of the odor components contained in the gas; A step 5 of calculating an amount of change in activated carbon consumption by summing up the first amount of activated carbon consumption and the amount of semi-activated carbon consumption of each of the undetectable odor components; A step 6 of calculating a change in a saturated region from the change in the consumption of the activated carbon, the cross-sectional area of ​​the adsorption bed, and the packing density of the activated carbon; A step 7 of integrating the calculated amount of change in the saturated region to calculate the length of the saturated region; The above-mentioned process is repeated.

[0015] According to this method for monitoring the consumption of activated carbon, it is possible to monitor the consumption of activated carbon due to odor components detected by the gas detector and the consumption of activated carbon due to odor components not detected by the gas detector, which can contribute to reducing the running costs of the adsorption bed. Effect of the Invention

[0016] According to the present invention, it is possible to grasp the time to replace activated carbon, which can contribute to reducing the running costs of the deodorization system. [Brief description of the drawings]

[0017] [Figure 1] Fig. 1(A) is a schematic diagram showing the main configuration of a deodorization system 100 including a first deodorization tower 1 and a second deodorization tower 2. Fig. 1(B) is a block diagram showing the main configuration of a monitoring device 18. [Diagram 2] FIG. 2 shows an example of the distribution of odor component concentrations in gas G that were actually measured. [Diagram 3] Fig. 3 is a schematic diagram showing the adsorption state of the activated carbon in the adsorption layer 14 over time. Fig. 3(A), Fig. 3(B), and Fig. 3(C) show the adsorption state of the activated carbon at the start of use, at an intermediate stage, and at the time of breakthrough, respectively.

[0018] (Embodiment 1) Fig. 1 shows the configuration of a deodorizing device in one embodiment of the present invention. Hereinafter, the configuration of the deodorizing device of this embodiment will be described with reference to Fig. 1. In the following, a configuration in which a wet deodorization tower (first deodorization tower 1) and a dry deodorization tower (second deodorization tower 2) are combined will be described, but the present invention is also applicable to a configuration in which only a dry deodorization tower (second deodorization tower 2) is used.

[0019] <Device configuration> Fig. 1(A) is a schematic diagram showing the main components of a deodorization system 100 equipped with a first deodorization tower 1 (wet deodorization tower) that performs a wet deodorization method and a second deodorization tower 2 (dry deodorization tower) that performs a dry deodorization method. Fig. 1(B) is a block diagram showing the main components of a monitoring device 18. In Fig. 1(A), the white arrow indicates the flow direction of gas G.

[0020] Odorous gas G, which contains hydrogen sulfide as an odorous component and is the target of deodorization, is discharged from facility R (not shown) (an odorous gas source such as a sewage treatment facility), and is controlled to a predetermined air volume by a blower B or the like, and is introduced into the first deodorization tower 1 via the gas inlet piping 3 connected to the gas inlet 13.

[0021] A packed bed 4 is provided above the gas inlet pipe 3, and a chemical solution discharge section 5 is further provided above the packed bed 4. The packed bed 4 is filled with a known packing material for gas-liquid contact. From the chemical solution discharger 5, a chemical solution L containing, for example, hypochlorous acid is discharged toward the packed bed 4. The gas G flows from the gas inlet pipe 3 toward the packed bed 4 above, and comes into contact with the chemical solution L in the packed bed 4. The odorous components of the gas G chemically react with the chemical solution L, and the concentration of the odorous components in the gas G decreases.

[0022] The chemical liquid L comes into contact with the gas G in the packed bed 4 and is then stored in a circulating chemical liquid tank 6 provided below the packed bed 4. The stored chemical liquid L is sent by a pump 8 through a pipe 7 to the chemical liquid discharging section 5 , and is circulated between the circulating chemical liquid tank 6 and the liquid spraying section 5 .

[0023] An exhaust port 9 for exhausting gas G is provided above the chemical solution discharge section 5 in the first deodorization tower 1. One end of a connecting pipe 10 for guiding gas G to the second deodorization tower 2 is connected to the exhaust port 9. The other end of the connecting pipe 10 is connected to an inlet 12 of the second deodorization tower 2. In order to separate the gas G and the chemical solution L, a gas-liquid separator 11 (demister) may be provided between the chemical solution discharge part 5 and the exhaust port 9 of the first deodorization tower 1.

[0024] The gas G treated by the chemical liquid L is introduced into the second deodorization tower 2 from the exhaust port 9 of the first deodorization tower 1 via a connecting pipe 10. The second deodorization tower 2 removes the remaining odor components from the gas G. Inside the second deodorization tower 2, an adsorption layer 14 is provided above the inlet 12. The adsorption layer 14 is filled with activated carbon. Gas G introduced into the second deodorization tower 2 through the inlet 12 flows into the adsorption layer 14 and comes into contact with the activated carbon. The odorous components remaining in the gas G are adsorbed by the activated carbon. As a result, the concentration of the odorous components in the gas G is further reduced, and the gas G is deodorized.

[0025] The gas G deodorized as described above is discharged to the outside of the second deodorization tower 2 (to the atmosphere) via an exhaust pipe 16 connected to an exhaust port 15 of the second deodorization tower 2.

[0026] The chemical liquid L can be appropriately selected according to the characteristics of the gas G exhausted from the facility R. Also, the chemical liquid L may be water, configured to remove water-soluble components and foreign matter from the gas G, and the remaining odor components may be adsorbed and removed by the adsorption layer 14 in the second deodorization tower 2.

[0027] A first gas detector 17 is provided at the inlet 12 (or near the inlet 12) of the connecting pipe 10, and the first gas detector 17 can measure the concentration of odorous components in the gas G flowing into the second deodorization tower 2. A second gas detector 19 and a third gas detector 20 are provided in the exhaust pipe 16 and the gas inflow pipe 3. The second gas detector 19 detects the odor component concentration of the gas G exhausted from the second deodorization tower 2, and the third gas detector 20 detects the odor component concentration of the gas G flowing into the first deodorization tower 1. The first gas detector 17, the second gas detector 19, and the third gas detector 20 enable the concentration of odorous components of the gas G to be constantly monitored.

[0028] As shown in FIG. 1(B), the monitoring device 18 includes a storage device 181, an arithmetic processing unit 182 (a microcomputer, a PC, or the like), and an IO unit 183 (an input / output unit). The concentration measurement values ​​output from the first gas detector 17, the second gas detector 19, and the third gas detector 20 are input to the calculation processing unit 182 via the IO unit 183 provided in the monitoring device 18, and are stored in the storage device 181. The stored concentration of gas G can also be used as history data. The monitoring device 18 may also include a display unit 184 (display screen, warning light, etc.). For example, it is possible to cause the display unit 184 to display the output values ​​of the first gas detector 17, the second gas detector 19, and the third gas detector 20, so that an operator can monitor the concentration of the gas G.

[0029] In addition, when the first deodorization tower 1 is not provided (or is not used) and the gas G is deodorized only by the second deodorization tower 2, the exhaust gas from the blower B may be introduced into the second deodorization tower 2 via a direct connecting pipe 10. The odorous components of the gas G are adsorbed and removed by the activated carbon in the adsorption layer 14.

[0030] An anemometer (not shown) may be provided at the inlet 12 of the connecting pipe 10. The wind speed of the gas G flowing into the second deodorization tower 2 can be measured by the anemometer. The output of the anemometer is input to the monitoring device 18, and the monitoring device 18 calculates the air volume of the gas G flowing into the second deodorization tower 2 from the cross-sectional area of ​​the inlet 12 of the connecting pipe 10 and the measurement value by the anemometer, and can constantly monitor the air volume of the gas G.

[0031] Since the first deodorization tower 1 and the second deodorization tower 2 are airtightly connected by the connecting pipe 10, the air volume of the gas G flowing into the first deodorization tower 1 may be equal to the air volume of the gas G flowing into the second deodorization tower 2. In this case, an anemometer is provided in the gas inflow pipe 3 connected to the gas inlet 13, and the air volume of the gas G can be calculated by the product of the measured air velocity value and the cross-sectional area of ​​the gas inflow pipe 3. In addition, since the air volume value of the gas G flowing into the first deodorization tower 1 can be maintained at a constant value by the blower B, the air volume of the gas flowing into the second deodorization tower 2 may be stored in the memory device 181 of the monitoring device 18 as being equal to the air volume of the blower B.

[0032] The monitoring device 18 may be configured to acquire the fan speed and power consumption of the blower B and monitor the operating state of the blower B. For example, by acquiring correlation data between the fan speed or power consumption of the blower B and the air volume in advance and storing it in the storage device 181 of the monitoring device 18, the monitoring device 18 can also detect changes in the air volume. The air volume of the blower B may be set appropriately depending on the amount of odorous components generated from the facility R.

[0033] <Calculating the amount of odor components> As described above, the monitoring device 18 can constantly monitor the air volume of the gas G flowing into the second deodorization tower 2 and the odor component concentration of the gas G. Therefore, the monitoring device 18 can calculate the amount (mass) of the odor components of the gas G flowing into the second deodorization tower 2 per unit time from the odor component concentration and air volume of the gas G detected by the first gas detector 17.

[0034] Gas G discharged from facility R contains multiple odor components. However, using detectors for each odor component to detect the concentration of all odor components would increase the cost of the equipment and the maintenance workload. In addition, some odor components are difficult to detect, and expensive detectors are required to detect such substances, and it is very difficult to constantly monitor the concentrations of such substances.

[0035] Therefore, the first gas detector 17 measures the concentration of a representative (first) odor component (hereinafter, sometimes referred to as the representative odor component) and uses that concentration to calculate the concentrations of other odor components, thereby making it possible to avoid increases in device costs as described above. The first gas detector 17 may be a detector that detects, for example, hydrogen sulfide as a representative odor component.

[0036] Each odor component in gas G has a characteristic concentration distribution that depends on the facility R that emits the odorous gas. Figure 2 shows an example of the measured concentrations of odor components contained in gas G. Figure 2 shows an example in which hydrogen sulfide (H2S), methyl mercaptan (CH3SH), methyl sulfide ((CH3)2S), and methyl disulfide (CH3SSCH3) were detected. Each odor component in gas G can be quantitatively identified using, for example, gas chromatography. In addition, in order to target odor components of the gas G to be treated in the adsorption layer 14, the gas G sampled at the inlet 12 of the second deodorization tower 2 is analyzed.

[0037] A representative odor component can be selected from a plurality of odor components actually measured, and the concentration of each odor component can be expressed as a ratio to the concentration of the representative odor component (referred to as odor component content ratio or simply content ratio). For example, hydrogen sulfide, which has the highest concentration and for which detectors are easily available, can be selected as the representative odor component. From the actual measured values ​​shown in Figure 2, when the concentration of selected hydrogen sulfide is normalized as the standard (content ratio RD = 1), the content ratios (RD) of methyl mercaptan, methyl sulfide, and methyl disulfide are 0.1, 0.5, and 0.45, respectively. The content ratios of each odor component are values ​​determined by facility R.

[0038] The results of determining the content ratio of the representative odor component (hydrogen sulfide) of the gas G to the other odor components can be stored in the storage device 181 for each odor component in association with the facility R. The monitoring device 18 inputs the measured concentration value of the representative odor component (hydrogen sulfide) from the first gas detector 17, and can calculate the concentrations of other odor components from the content ratio of each odor component stored in the memory device 181 and the concentration of the acquired representative odor component. In other words, it is not necessary to provide a detector that corresponds to all odorous components, and in the case of odorous gas G that contains hydrogen sulfide, a readily available commercially available hydrogen sulfide detector can be used.

[0039] Although it is not excluded to provide a gas detector corresponding to each odor component, providing a gas detector capable of detecting representative odor components as described above can contribute to reducing the cost of the device. For example, electrically neutral methyl sulfide and methyl disulfide are difficult to detect, and in reality, detectors capable of constantly monitoring these odor components are not available. However, by using representative odor components and their content ratios, it becomes possible to constantly monitor the concentrations of odor components that are difficult to detect.

[0040] It should be noted that a plurality of gas detectors may be provided so as to be able to detect a plurality of types of odor components. For example, the first gas detector 17 may be configured with two gas detectors, one for detecting hydrogen sulfide and the other for detecting methyl mercaptan. As described above, it is preferable to configure the detector with one detector from the viewpoint of the cost of the device, but the first gas detector 17 may be configured with a plurality of detectors if there is an odor component (e.g., a second odor component, etc.) that needs to be detected in addition to the representative odor component, depending on the characteristics of the facility R (or the customer's request). In this case, for example, the content ratio of the second odor component may be calculated using the actual odor component concentration by the first gas detector 17, as RD = [actual measurement value of the second odor component concentration] / [actual measurement value of the representative odor component concentration], and the second odor component may be treated, monitored, and managed in the same way as other odor components.

[0041] More preferably, when it is expected that the distribution of each odor component will change depending on the season or time of day, the distribution of each odor component may be measured for each season or the like in which the change is expected, and the content ratio of each odor component to the representative odor component may be stored in the storage device 181 of the monitoring device 18. The calculation processing unit 182 of the monitoring device 18 can use a calendar function (timekeeping function) to calculate the content ratio between the seasons in which the distribution of each odor component was measured by interpolation, and it is also possible to flexibly respond to seasonal changes in the calculation of the odor component concentration, as necessary.

[0042] <Changes over time in activated carbon in the adsorption layer> FIG. 3 is a schematic diagram showing the adsorption status of activated carbon in adsorption layer 14 over time. FIG. 3(A) shows the adsorption status of activated carbon at the start of use, FIG. 3(B) shows the adsorption status of activated carbon at an intermediate stage, and FIG. 3(C) shows the adsorption status of activated carbon at the time of breakthrough. In FIG. 3, the vertical axis (Y axis) shows the amount of adsorption of activated carbon, and the horizontal axis (X axis) shows the longitudinal position of adsorption layer 14. In the example shown in FIG. 3, the longitudinal length of adsorption layer 14 (more precisely, the longitudinal length of all activated carbon loaded in adsorption layer 14) is equal to Z. In Fig. 3, the dotted line indicates the position dependence of the adsorption amount of activated carbon. q0 on the Y axis indicates the adsorption amount when the activated carbon reaches adsorption equilibrium. Gas G flows into the adsorption layer 14 from the X=0 side and is discharged from the opposite X=Z side. Hereinafter, the X=0 side may be referred to as the upstream side, and the X=Z side as the downstream side.

[0043] As shown in FIG. 3(A), at the start of use, i.e., when introduction of gas G into the adsorption layer 14 is started and the (unused) activated carbon starts to adsorb the odorous components of gas G, the adsorption amount of the activated carbon gradually decreases in the longitudinal direction from q0 at X=0, and becomes 0 at the position of distance Z1 (X=Z1). In the region from X=Z1 to X=Z1+Z0 (=Z), the amount of odor components adsorbed by the activated carbon is 0. The concentration of odor components in the gas G discharged from the adsorption layer 14 is 0. Hereinafter, the region where the amount of adhesion decreases from q0 to 0 is referred to as the adhesion region, and the region where the amount of adhesion is 0 is referred to as the non-adsorption region. Z1 is the length of the adhesion region, and Z0 is the length of the non-adsorption region. The activated carbon in the adsorption region has adsorbed odorous components, but is still capable of adsorbing further odorous components and has not yet reached saturation. The activated carbon in the non-adsorption region has not adsorbed any odorous components.

[0044] As shown in FIG. 3(B), when the odor component adsorption process by the activated carbon progresses further, the amount of activated carbon that has reached a saturated state of adsorption increases, and the adsorption amount of the activated carbon in the region from X=0 to X=Z2 becomes q0. Hereinafter, the region where the adsorption amount is saturated (or equal to the adsorption amount in equilibrium) as described above is referred to as the saturated region. The activated carbon in the saturated region is in a state where the amount of adsorption of odor components has reached saturation and cannot adsorb any more odor components. The activated carbon in the region from X=0 to X=Z2 has been consumed by the odor components of gas G. On the other hand, the activated carbon in the adsorption region from X=Z2 to X=Z2+Z1 has not yet reached saturation in the amount of adsorption of odor components, and can therefore adsorb more odor components. In addition, the term "activated carbon is consumed" means that the activated carbon has adsorbed odorous components, the adsorption of the odorous components has reached saturation, and further adsorption is no longer possible. Hereinafter, the term "activated carbon consumption" means the amount of activated carbon that has adsorbed odorous components and reached saturation.

[0045] In Fig. 3, Z2 is the length of the saturated region, and Z2 reflects the amount of activated carbon consumed. As shown in Fig. 3(B), the adsorption region (X=Z2 to X=Z2+Z1) continues downstream of the saturated region (X=0 to X=Z2), and the non-adsorption region (X=Z2+Z1 to X=Z2+Z1+Z0) continues downstream of the adsorption region. In Fig. 3, the concentration of odorous components in gas G discharged from adsorption layer 14 is 0.

[0046] As shown in Fig. 3(C), when the process of adsorption of odor components by the activated carbon continues, the saturated region increases, the unadsorbed region disappears, the downstream end of the adsorption region coincides with the downstream end of the adsorption layer 14, and the activated carbon in the adsorption layer 14 enters a breakthrough state. In this state, the saturated region is the region from X=0 to X=Z2 at the upstream end in the length direction, and the adsorption region is the region from X=Z2 to X=Z2+Z1 (=Z) in the length direction. In this state, the concentration of odor components in the gas G discharged from the adsorption layer 14 is 0, but if gas G is further introduced into the adsorption layer 14 in this state, the concentration of odor components in the gas G discharged from the adsorption layer 14 will gradually increase. Therefore, the activated carbon in the adsorption layer 14 that has reached the breakthrough state must be replaced with unadsorbed activated carbon. The adsorption layer 14 may be configured as a unit (cartridge) in which activated carbon is housed in a housing, and the adsorption layer 14 itself may be replaced.

[0047] Note that Fig. 3 is a schematic diagram for simply explaining the adsorption process of activated carbon, and describes an ideal situation. Therefore, for example, "the concentration of odorous components in the discharged gas G is 0" means that the concentration is substantially 0 or a value close to 0 (e.g., below the regulated value), and the schematic diagram in Fig. 3 should not be interpreted in a restrictive manner.

[0048] <Activated carbon consumption in the adsorption layer> The activated carbon in the adsorption layer 14 adsorbs odorous components contained in the gas G, thereby deodorizing the gas G. The activated carbon in the adsorption layer 14 that has reached the breakthrough state must be promptly replaced. In order to prevent the emission of odorous components, reduce the amount of unadsorbed activated carbon that needs to be replaced wastefully, and effectively utilize the activated carbon, it is important to grasp the amount of activated carbon consumed in the adsorption layer 14.

[0049] As described below, the monitoring device 18 can calculate the amount of activated carbon consumed in the adsorption layer 14 using the concentration of odorous components detected by the first gas detector 17, and can constantly monitor the amount of activated carbon consumed (or monitor it at a predetermined sampling interval). From the amount of activated carbon consumed thus calculated, it is possible to grasp the lengths of the saturated region, the adsorbed region, and the unadsorbed region in the adsorption layer 14 as shown in Fig. 3, and to judge whether the adsorption layer 14 is in a breakthrough state or is close to a breakthrough state. A method for calculating the amount of activated carbon consumed from the concentration of odor components in the gas G will be described below.

[0050] The mass of activated carbon required to adsorb odor components (amount of activated carbon consumed) depends on the amount (mass) of odor components that flow into the adsorption layer 14. The volume of gas G flowing into the second deodorization tower 2 in a unit time interval (or a predetermined sampling time interval) Δt [min] is the air volume FV [m 3 / min] and the time interval Δt (FV*Δt). The amount (mass) M [kg] of odorous components in gas G is proportional to the product (C) of the odorous component concentration in gas G and the volume of the flowing gas G (C*FV*Δt), and can be calculated easily. For example, the mass M of an odorous component with a molecular weight mw at an air temperature T [℃] can be calculated as follows: M=C*mw*FV / {0.0224*(273+T) / (270)}*Δt (Equation 1)

[0051] The predetermined time interval Δt can be appropriately set as a non-limiting example, such as 1 minute, 5 minutes, 10 minutes, etc. Furthermore, the monitoring device 18 may obtain (sample) the detection data from the first gas detector 17 at an even shorter interval, for example, at 5 second intervals, average the detection data obtained within the time interval Δt, and calculate the amount (mass) M of the odor component from the average concentration obtained. The sampling frequency is not limited to 5 seconds, but can be set arbitrarily.

[0052] The amount of odor components adsorbed by the activated carbon can be obtained in advance by experiment. The amount Y [kg / kg] of odor components adsorbed by the activated carbon (per unit amount) is a function fn(C) (hereinafter referred to as the adsorption function) of the concentration C of the odor components contained in the gas G flowing into the adsorption layer 14. Y=fn(C) (Formula 2) As the function fn(C), for example, Freundlich's adsorption isotherm is adopted as shown below, and the first parameter a and the second parameter b are determined by a preliminary experiment, so that an adsorption function that determines the amount of odor components adsorbed by activated carbon can be determined. Y=fn(C)=a*C 1 / b (Formula 2') The adsorption function fn(C) can be stored in the storage device 181 of the monitoring device 18. For example, the storage device 181 can store parameters (first parameter a, second parameter b) that determine the function type of fn(C), and the calculation processing unit 182 can calculate the amount Y of odor components adsorbed by the activated carbon by an algorithm that executes the calculation formula of Equation 2'.

[0053] The monitoring device 18 can use the acquired activated carbon adsorption amount Y to calculate the activated carbon consumption amount W [kg] as follows. W=M / Y (Equation 3) The amount of activated carbon consumed during a given time interval Δt, W, and the packing density BD [kg / m 3 ] and the cross-sectional area S [m 2 ], the increase in the length of the saturated region ΔZ2 (=W / (BD*S)) can be obtained. That is, the increase (change) in the saturated region ΔZ2 [m] is obtained from the concentration of the odor component detected by the first gas detector 17, and the length of the saturated region Z2 is calculated by integrating ΔZ2, and the transition of Z2 over time can be monitored.

[0054] Obtaining the adsorption amount Y of each odor component by experimentation for each odor component would greatly increase the manufacturing cost of the device. The odor component concentration can be measured by the first gas detector 17, but if the first gas detector 17 is configured to detect only the concentration of a representative odor component (e.g., hydrogen sulfide), the concentrations of the other odor components contained in the gas G can be calculated from the content ratios stored in the storage device 181. When gas G contains multiple odor components, it is possible to approximately calculate the amount of activated carbon consumed by the multiple odor components by calculating the amount of activated carbon consumed for the representative odor component and multiplying the amount of activated carbon consumed by the representative odor component by the sum of all the content ratios (1+0.1+0.5+0.45=2.05 in the example shown in Figure 2). However, the above-described simple calculation method does not reflect the adsorption characteristics of each odor component by activated carbon, and therefore the calculated amount of activated carbon consumption has a large error.

[0055] The present invention provides a method for calculating the amount of activated carbon consumption by utilizing the equilibrium adsorption amount of each odor component in order to improve the accuracy of the calculated amount of activated carbon consumption. The equilibrium adsorption amount of each odor component is an amount determined by the type (molecule) of the odor component and its concentration, and can be obtained by a preliminary experiment or the like, but a known equilibrium adsorption amount can also be used.

[0056] A method for calculating the amount of activated carbon consumed will be described in detail below. It is assumed that a gas G containing n types of odor components Di (i=1 to n) to be deodorized is generated from a facility R. Between time t and time t+Δt (or, in actual operation, discretely, time t=t k From time t k+1 =t k +Δt), the mass of odor components Di (i=1 to n) flowing into the adsorption layer 14 is M Di (t) [kg], the equilibrium adsorption amount of the odor component Di on the activated carbon is Q Di [kg / kg]. As mentioned above, the equilibrium adsorption amount Q of the activated carbon for the odor component Di is Di can be stored in advance in the storage device 181 of the monitoring device 18 in correspondence with the type (molecule) of the odor component.

[0057] Hereinafter, the representative odor component detected by the first gas detector 17 is designated as odor component D1 (i=1), the concentration of odor component D1 is designated as C1(t), and the mass flowing into the adsorption layer 14 is designated as M D1 The amount Y (=Y1) of the odor component D1 adsorbed on the (first) activated carbon can be obtained by the formula 2 (or formula 2') based on the preliminary experiment as described above.

[0058] When the first gas detector 17 is configured to detect only the concentration of a representative odor component (e.g., hydrogen sulfide), the monitoring device 18 can calculate the concentration of other odor components (undetectable odor components) not detected by the first gas detector 17 as follows.

[0059] 2, the content ratios RDi (i=1 to n) of the odor components Di (i=1 to n) in the gas G are calculated. The content ratios RDi (i=1 to n) are stored in the storage device 181 of the monitoring device 18. For ease of calculation, the content ratio RD1 of the representative odor component D1 (hydrogen sulfide) may be normalized to RD1=1, and the content ratios RDi (i=2 to n) of the other odor components may be expressed as relative content ratios. For example, the concentration distribution shown in Figure 2 can be obtained, and the concentration of each odor component can be divided by the concentration of the representative odor component. (Hereinafter, RD1 is normalized to 1.) If the concentration of the representative odor component D1 (representative component concentration) detected by the first gas detector 17 is C1(t), the concentrations Ci(t) of the other odor components are as follows: Ci(t)=RDi*C1(t) (Eq. 4) (where i = 1 to n)

[0060] The monitor 18 can calculate the mass of each odor component flowing into the adsorption layer 14 as follows. The mass of the representative odor component D1 flowing into the adsorption layer 14 between time t and time t+Δt is M D1 (t), the mass M of each odor component Di Di (t) is as follows: M Di (t)=(mwi / mw1)*RDi*M D1 (t) (Equation 5) (where i = 1 to n) Here, mwi is the molecular weight of each odor component Di.

[0061] The equilibrium adsorption amount for each odor component Di is Q Di The mass M of each odor component Di that flows into the adsorption layer 14 between time t and time t+Δt is Di (t) and the above equilibrium adsorption amount Q Di The ratio Vi(t) [kg] to Vi(t) = M Di (t) / Q Di (Formula 7) (where i = 1 to n)

[0062] In the equilibrium state, the amount of activated carbon consumed by an odor component of mass M is given by M / Q, where Q is the equilibrium adsorption amount. Therefore, Vi(t) for each odor component Di corresponds to the amount of activated carbon consumed by each odor component Di. In order to distinguish between the activated carbon consumption W (W(t) etc.) calculated using the actually measured odor component concentrations using Equations 1 to 3 and Vi(t), the activated carbon consumption W may be referred to as the representative activated carbon consumption or the actual activated carbon consumption, and Vi(t) may be referred to as the semi-activated carbon consumption or the calculated activated carbon consumption. The semi-activated carbon consumption V1(t) of the representative odor component D1 is equal to the representative activated carbon consumption (actual activated carbon consumption) W1(t) of the representative odor component D1.

[0063] Vi(t) is the mass of the representative odor component D1, M D1 When transformed using, it becomes as follows: Vi(t)=(mwi / mw1)*RDi*M D1 (t) / Q Di (Formula 8) (where i = 1 to n)

[0064] The ratio (relative consumption ratio) RVi between the semi-activated carbon consumption Vi(t) of each odor component Di and the semi-activated carbon consumption V1(t) of the representative odor component D1 is defined as follows: RVi=Vi(t) / V1(t) (Equation 9) (where i = 1 to n)

[0065] From equations 8 and 9, RVi is expressed as equation 9 below. RVi = (mwi / mw1) * (RDi / RD1) * (Q D1 / Q Di ) =(mwi / mw1)*RDi*(Q D1 / Q Di ) (Equation 10) (where i = 1 to n)

[0066] Equilibrium adsorption amount Q Di is determined by the odor component Di, and RVi is determined by the content RDi of each odor component Di in gas G. In other words, the relative ratio of activated carbon consumption for each odor component Di (RVi) is determined by the characteristics of gas G discharged from facility R. Therefore, the activated carbon consumption relative ratio (RVi) can be calculated in advance and stored in the storage device 181 of the monitoring device 18.

[0067] The semi-activated carbon consumption amount Vi(t) for each odor component Di can be calculated using Equation 9 as follows. Vi(t)=RVi*V1(t) (Equation 11) (where i = 1 to n)

[0068] As V1(t), the actual activated carbon consumption W1(t) (=W) obtained from the actual measured concentration of the representative odor component D1 from time t to t+Δt using Equation 1, Equation 2 (Equation 2'), and Equation 3 is used, and the semi-activated carbon consumption Vi of each of the other odor components is calculated as follows. Vi(t)=RVi*W1(t) (Equation 12) (where i = 1 to n) Here, for i=1, V1(t)=W1(t). By applying Equation 10 to Equation 12, Vi(t) is given as follows. Vi(t) = (mwi / mw1) * RDi * (Q D1 / Q Di )*W1(t) (Equation 12') (where i = 1 to n)

[0069] The amount of activated carbon consumed for components other than the major odor components can be approximated by Equation 12 (or Equation 12′) using the semi-activated carbon consumption Vi(t) calculated using Equation 11.

[0070] The change in activated carbon consumption (total change in consumption) TS(t) [kg] due to multiple (n types) odor components contained in gas G during a given time interval Δt is calculated as the sum of Vi(t) for all odor components. TS(t)=ΣVi(t) (Eq. 13) Here, Σ means the sum from i=1 to n.

[0071] By substituting Equation 12' into Equation 13, the activated carbon consumption change amount Wts(t) is obtained as follows. TS(t)=Σ{(mwi / mw1)*RDi / Q Di}*Q D1 *W1(t) (Equation 14)

[0072] Therefore, the calculation processing unit 182 of the monitoring device 18 executes a hybrid calculation method of calculating the actual activated carbon consumption (W1(t)) based on a preliminary experiment for the representative odor component and calculating the semi-activated carbon consumption (Vi(t)) based on a theoretical formula for the other odor components, and can obtain the activated carbon consumption change TS(t) due to the gas G having a plurality of odor components.

[0073] In addition, when the first gas detector 17 is composed of two or more gas detectors and is capable of detecting the concentration of an odor component Dk other than the representative odor component (odor component D1), for the odor component Dk whose concentration has been actually measured, the actual activated carbon consumption Wk(t) may be calculated using Equation 1, Equation 2 (Equation 2') and Equation 3, and the activated carbon consumption change TS(t) may be calculated using Equation 13 assuming that Vk(t) is equal to Wk(t).

[0074] The change in the length of the saturated region ΔZ2(t) [m] from time t to a predetermined time interval Δt (from time t to time t + Δt) is calculated by the activated carbon consumption change TS(t), the packing density BD of the activated carbon in the adsorption layer 14 [kg / m 3 ] and the cross-sectional area S [m 2 ] is used to calculate as follows: ΔZ2(t)=TS(t) / (BD*S) (Eq. 15)

[0075] The activated carbon consumption change rate TS(t) and ΔZ2(t) are the changes in a given time interval Δt. Therefore, the total amount (accumulated amount) of activated carbon consumed from the start of the adsorption layer 14 (time t=0) to time t+Δt can be obtained by integrating the activated carbon consumption change rate TS(t). Similarly, the length Z2 of the saturated region of the activated carbon in the adsorption layer 14 is obtained by integrating ΔZ2(t).

[0076] Therefore, the monitoring device 18 repeatedly executes the following steps (1) to (7) at a predetermined time interval Δt. (1) The monitoring device 18 acquires (inputs) a concentration measurement value C1 of the representative odor component (first odor component) detected by the first gas detector 17. (2) Using the parameters of the adsorption function (parameters that determine the function), the air volume FV, the molecular weight mw1 of the representative odor component, and the concentration C1 of the representative odor component (first odor component) stored in the storage device 181, the mass of the representative odor component adsorbed on the activated carbon (representative odor component adsorption mass) M D1 Calculate (t). (3) Calculate the (first) activated carbon consumption (representative activated carbon consumption) (W1(t)) due to the representative odor component from the equilibrium adsorption amount of the representative odor component (first odor component) D1 stored in the storage device 181 and the calculated representative odor component adsorption amount. (4) The content ratio RDi of each odor component Di and the equilibrium adsorption amount Q Di The amount of activated carbon consumed (semi-activated carbon consumed) Vi(t) by each odor component (undetectable odor component) Di not detected by the first gas detector 17 is calculated from the molecular weight mwi and the amount of activated carbon consumed (W1(t)) by the calculated representative odor component D1. (5) The amount of activated carbon consumption change (TS(t)) is calculated by summing the amount of activated carbon consumption (W1(t)) due to the calculated representative odor component and the amount of activated carbon consumption (Vi(t)) of each odor component Di not detected by the first gas detector 17. (6) The activated carbon packing density BD [kg / m 3 ] and the cross-sectional area S [m 2 ] and the calculated change in activated carbon consumption (TS(t)), the change in length of the saturated region, ΔZ2(t), is calculated. (7) The calculated change in the length of the saturated region, ΔZ2(t), is integrated from the start of use of the adsorption layer 14 (t=0) to calculate the length Z2 [m] of the saturated region at time t+Δt. In addition, the length Z2 of the saturated region may be calculated according to (5) after integrating the amount of change in activated carbon consumption (TS(t)). Integrating ΔZ2(t) is substantially equivalent to integrating the amount of change in activated carbon consumption (TS(t)). As a result, the monitoring device 18 can calculate the time progression of the saturated region.

[0077] In addition, when multiple odor components Dk can be detected by the first gas detector 17, the activated carbon consumption Wk(t) of the odor components whose concentrations are detected in the above (1), (2), and (3) may be calculated, and Wk(t) may be added to TS(t) in (5). Alternatively, in the above (1), (2), and (3), the activated carbon consumption amount Wk(t) of the odor component whose concentration has been detected may be calculated, and in (4), Vk(t)=Wk(t) may be set, and in (5), the activated carbon consumption change amount TS may be calculated.

[0078] The length Z1 of the adsorption region existing between the saturated region and the non-adsorbed region can be obtained by a preliminary experiment. Z1 depends on the superficial velocity [m / min] (=air volume (FV) / cross-sectional area (S)), and does not depend on the length Z2 of the saturated region. When the air volume of the gas G is kept at a constant value by the blower B, Z1 becomes constant. The length Z1 of the adsorption region is stored in the memory device 181 of the monitoring device 18. For example, if the characteristics (particle size, packing rate) of the activated carbon mounted in the adsorption layer 14 are the same and the low concentration end of the non-adsorption region is set as the regulated concentration, Z1 is a function proportional to the power of the superficial velocity (Z1=k*[superficial velocity] α ) can be calculated as follows: When the flow rate (superficial velocity) of the gas G changes, the length Z1 of the adsorption region may be calculated (monitored) by the monitoring device 18 using the superficial velocity and stored in the storage device 181 of the monitoring device 18.

[0079] <Adsorption layer monitoring> When the deodorization system 100 is put into operation and starts deodorizing the gas G, the monitoring device 18 inputs the concentration of the representative odor component from the first gas detector 17 and starts calculating the length Z2 of the saturated region at a predetermined time interval Δt. At the time when the deodorization system 100 starts the deodorization process of the gas G, the activated carbon of the adsorption layer 14 is in an unadsorbed state, and the length Z2 of the saturated region is zero.

[0080] The monitoring device 18 calculates the sum (Z1+Z2) of the length Z1 of the adsorption region and the length (total length) Z2 of the saturation region stored in the memory device 181 at a predetermined time interval Δt, and compares this sum (Z1+Z2) with the longitudinal length Z of the activated carbon loaded on the adsorption layer 14 (total activated carbon loaded).

[0081] When Z1+Z2 equals Z, monitor 18 can determine that adsorption bed 14 has reached the breakthrough state and issue a warning to an operator. In addition, monitoring device 18 may display the ratio of Z1+Z2 to Z (=(Z1+Z2) / Z) as the usage ratio, and may display the ratio of Z-(Z1+Z2) to Z (=1-(Z1+Z2) / Z) as the remaining ratio. In addition, in the case where the adsorption layer 14 is equipped with an amount of activated carbon equivalent to one year's consumption (design life), the monitoring device 18 may multiply the design life by the usage ratio or the remaining ratio and display the result as the number of days of use or the number of days remaining. The monitoring device 18 can display warnings, usage rates, and the like on the display unit 184, and can also output them to the outside via the IO unit 183.

[0082] The monitoring device 18 may also issue a warning before the adsorption layer 14 reaches a breakthrough state. For example, the monitoring device 18 may check at a predetermined time interval Δt whether Z1+Z2 has reached a predetermined percentage of Z (judgment value Rth), for example 90%, and issue a warning when Z1+Z2 is equal to or greater than the predetermined percentage of Z (Z1+Z2≧Rth*Z).

[0083] Alternatively, the monitoring device 18 may compare the difference (Z-Z1) between the longitudinal lengths Z and Z1 of the activated carbon loaded in the adsorption layer 14 (total loaded activated carbon) with the length Z2 of the saturated region, and issue an alarm when the length Z2 of the saturated region is equal to the difference between Z and Z1 or when the difference between Z and Z1 becomes equal to or exceeds a predetermined percentage.

[0084] In either case, the monitoring device 18 can issue a warning when the length Z2 of the saturated region becomes equal to or greater than a predetermined threshold. The threshold can be set in advance and stored in the storage device 181 of the monitoring device 18.

[0085] Conventionally, the usable period (or the lifespan of the activated carbon) of the activated carbon mounted on the adsorption layer 14 is set based on past experience, but in reality, it can be difficult to predict the usable period. Since the monitoring device 18 calculates the saturation region Z2 while detecting the actual concentration of odor components, the usable period of the activated carbon can be recalculated (or corrected) by using this saturation region calculation function, as described below. The monitoring device 18 calculates the daily fluctuation rate of Z2 (hereinafter referred to as the average fluctuation amount) from the change (increase) in Z2 over a predetermined period, for example, the most recent month, and can calculate the total number of days from the start of use to breakthrough by dividing (Z-Z1) by the average fluctuation amount ((Z-Z1) / average fluctuation amount), and can calculate the remaining number of usable days by dividing the length of the unadsorbed area by the average fluctuation amount ((Z-Z1-Z2) / average fluctuation amount). The monitoring device 18 can display these calculated numbers of days on the display unit 184. The average fluctuation amount can be adjusted at any time, and the remaining number of usable days can also be adjusted at any time.

[0086] The warning may be issued by displaying on the display unit 184 provided on the monitoring device 18 that the breakthrough has been reached, or by emitting an alarm sound. In addition, an output signal may be sent from the IO unit 183 of the monitoring device 18 to an external monitor or computer.

[0087] The operator can follow the warning issued by the monitoring device 18 and replace the adsorption bed 14 or the activated carbon mounted in the adsorption bed 14 . After replacing the adsorption layer 14 (or the activated carbon in the adsorption layer 14), the operator resets the value of Z2 calculated by the monitoring device 18 to 0. The monitoring device 18 can calculate and monitor the integrated consumption amount (adsorption amount) of the activated carbon in the new adsorption layer 14.

[0088] The monitoring device 18 may be configured to monitor the output of the second gas detector 19 and issue an alarm if the gas G discharged from the second deodorization tower 2 has an odor component concentration equal to or higher than a predetermined level.

[0089] The monitor 18 can monitor the amount of activated carbon consumed in the adsorption layer 14 by using the output value of the concentration detected by the first gas detector 17. Therefore, the first gas detector 17 and the monitor 18 constitute an activated carbon consumption monitoring unit. The first gas detector 17 is required to be attached to the inlet 12 of a deodorization tower (second deodorization tower 2) having an adsorption layer 14 loaded with activated carbon, and is required to be able to measure the concentration of the representative odor. Also, the first gas detector 17 and the monitoring device 18 are required to be able to communicate with each other via a signal line or wirelessly. Therefore, the activated carbon consumption monitoring unit can be easily applied to existing deodorization towers. [Industrial Applicability]

[0090] The deodorizing system 100 according to the present invention can monitor the consumption of activated carbon in the adsorption layer, which is the deodorizing layer, and can predict breakthrough of the activated carbon, thereby encouraging replacement of the activated carbon at the appropriate time. In addition, it is possible to reduce waste of activated carbon, which can contribute to reducing the running costs of the deodorizing system 100, and thus the present invention has great industrial applicability. [Explanation of symbols]

[0091] 100 Deodorizing System 1. First deodorizing tower (wet deodorizing tower) 2. Second deodorization tower (dry deodorization tower) 3 Gas inlet piping 4 Filled bed 5. Chemical solution discharge section 6 Circulating chemical tank 7 Piping 9 Outlet 8. Pump 10 Connecting piping 11 Gas-liquid separator (demister) 12 Inlet 13 Gas inlet 14 Adsorption layer 15 Outlet 16 Exhaust piping 17 First Gas Detector 18 Monitoring equipment 181 Storage device 182 Processing Unit 183 IO section (input / output section) 184 Display section 19 Secondary Gas Detector 20 Third Gas Detector B Blower G. Odorous gas L Chemical Solution R Facility (Odorous gas source)

Claims

1. The present invention is provided with a deodorization tower for deodorizing a gas containing a plurality of odorous components, a gas detector, and a monitoring device, The deodorization tower has an adsorption layer, The adsorption layer is equipped with activated carbon that adsorbs odorous components of the gas, The gas detector outputs a concentration measurement value of a first odor component in the gas flowing into the deodorization tower, The monitoring device, at a predetermined time interval, The concentration measurement value is input, and a first activated carbon consumption amount due to the first odor component is calculated; calculating a consumption amount of semi-activated carbon due to odor components not detected by the gas detector using the first consumption amount of activated carbon and the odor component content ratio of the gas; A deodorization system comprising: a deodorizing unit for monitoring a change in the consumption of activated carbon in the adsorption bed based on the consumption of the first activated carbon and the consumption of the semi-activated carbon.

2. 2. The deodorizing system according to claim 1, wherein the monitoring device calculates the amount of change in the length of the saturated region of the activated carbon loaded in the adsorption bed during the specified time interval from the amount of change in activated carbon consumption.

3. The deodorizing system according to claim 2, characterized in that the monitoring device integrates the amount of change in the length of the saturated region, calculates the total length of the saturated region in the activated carbon in the adsorption layer, and issues an alarm when the total length of the saturated region becomes equal to or greater than a threshold value.

4. This is a monitoring unit for a deodorization tower that uses activated carbon to deodorize gas containing multiple odorous components. The monitoring unit includes a gas detector and a monitoring device. The monitoring device stores a content ratio of odor components contained in the gas, The gas detector outputs a concentration measurement value of a first odor component in the gas; The monitoring device inputs the concentration measurement value at a predetermined time interval, calculates a first activated carbon consumption amount of the activated carbon consumed by the first odor component, and calculating a consumption amount of semi-activated carbon of the activated carbon due to the odor components not detected by the gas detector using the consumption amount of the first activated carbon and the content ratio of the odor components contained in the gas; A monitoring unit that calculates an amount of change in activated carbon consumption of the activated carbon from the first amount of activated carbon consumption and the semi-activated carbon consumption.

5. A method for monitoring consumption of activated carbon mounted in an adsorption layer of a deodorization tower for deodorizing a gas containing a plurality of odorous components, At a given time interval, obtaining a concentration measurement value of a first odor component contained in the gas measured by a gas detector; calculating an adsorption mass of the first odor component adsorbed on the activated carbon from the concentration measurement value; calculating a first activated carbon consumption amount due to the first odor component from the adsorption mass of the first odor component and the equilibrium adsorption amount of the first odor component; calculating a semi-activated carbon consumption amount of each of the undetectable odor components that are not detectable by the gas detector from the first activated carbon consumption amount and the content ratio and equilibrium adsorption amount of each of the odor components contained in the gas; calculating an amount of change in activated carbon consumption by summing up the first amount of activated carbon consumption and the amount of semi-activated carbon consumption of each of the undetectable odor components; calculating a change in a saturated region from the change in the amount of activated carbon consumption, the cross-sectional area of ​​the adsorption bed, and the activated carbon packing density; integrating the calculated amount of change in the saturated region to calculate the length of the saturated region; The method for monitoring activated carbon consumption is characterized by repeating the above steps.

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