Blow-by water neutralizing device

Abstract

To provide a blow water neutralizing device capable of grasping abnormality at an early stage.SOLUTION: The blowdown water neutralization device is a device for neutralizing blowdown water using boiler exhaust gas, and includes a tank for storing blowdown water, an exhaust gas supply device for supplying boiler exhaust gas to the blowdown water, an acid consumption sensor for detecting the acid consumption of the blowdown water in the tank or the blowdown water in a circulation flow path connecting the tank and the exhaust gas supply device, and an expected neutralization time calculation unit for calculating an expected neutralization time required for the exhaust gas supply device to neutralize the blowdown water based on the measurement result of the acid consumption sensor.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a blow water neutralizer, and more particularly to a blow water neutralizer that neutralizes blow water using exhaust gas from a boiler. [Background technology]

[0002] The boiler water inside a boiler, which heats water to generate steam, becomes strongly alkaline due to impurities contained in the water it is fed into. Before this boiler water can be discharged outside the factory, it must be neutralized to meet specified wastewater standards. A conventional neutralization process is known in which exhaust gas is mixed with boiler water (hereinafter referred to as "blow water") discharged from a boiler to neutralize the exhaust gas. The blow water neutralization device for performing the neutralization process includes a tank for storing the blow water and an exhaust gas mixing device (including, for example, a circulation flow path, a pump, and an ejector) for circulating the blow water and mixing the exhaust gas into the blow water (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-187738 Summary of the Invention [Problem to be solved by the invention]

[0004] In the blow water neutralization device, blow water is stored in a tank and when the water level reaches a predetermined height, the neutralization circulation operation begins. During the neutralization circulation, the pH of the blow water is measured. If the measured pH value is equal to or higher than the target value, the neutralization circulation operation continues. If the measured value falls below the target value, the neutralization circulation operation ends. Generally, if there is some abnormality in the blow-water neutralization device, the neutralization time will be longer. Therefore, if the neutralization time is longer than the standard time, it is highly likely that there is an abnormality in the device.

[0005] In conventional blow-water neutralization equipment, if neutralization is not completed within 15 minutes from the start of the neutralization circulation operation, a warning of insufficient neutralization is issued. However, if neutralization takes more than 15 minutes, there is a high possibility that the equipment malfunction has progressed significantly and is in a serious state.

[0006] An object of the present invention is to provide a blow-underwater neutralization device that can detect abnormalities early. [Means for solving the problem]

[0007] (1) A blow water neutralization device is a device for neutralizing blow water using boiler exhaust gas, and includes a tank for storing the blow water, an exhaust gas supply device for supplying the boiler exhaust gas to the blow water, an acid consumption sensor for detecting the acid consumption of the blow water in the tank or the blow water in a circulation flow path connecting the tank and the exhaust gas supply device, and a planned neutralization time calculation unit for calculating the planned neutralization time required for the exhaust gas supply device to neutralize the blow water based on the measurement results of the acid consumption sensor.

[0008] (1) The blow-underwater neutralization device provides a planned neutralization time, which can be used to detect malfunctions in the blow-underwater neutralization device early on.

[0009] (2) The blow water neutralization device further includes a neutralization time measurement unit that measures the measured neutralization time that the exhaust gas supply device actually takes to neutralize the blow water, and a comparison unit that compares the planned neutralization time with the measured neutralization time.

[0010] (2) In the blow-underwater neutralization device, malfunctions in the blow-underwater neutralization device can be detected early by comparing the planned neutralization time with the measured neutralization time.

[0011] (3) The blow-down neutralization device further includes an alarm means for issuing an alarm if the comparison result of the comparison unit indicates that the measured neutralization time is longer than the planned neutralization time or a comparison time created based on the planned neutralization time.

[0012] (3) In the case of the blow-underwater neutralization device, if the measured neutralization time is longer than the scheduled neutralization time, an alarm will sound, allowing early detection of a malfunction in the blow-underwater neutralization device.

[0013] (4) The blow water neutralization device further includes a CO2 absorption amount calculation unit that calculates the CO2 absorption amount in the blow water based on the acid consumption amount in the blow water and the neutralization operation time of the exhaust gas supply device.

[0014] (4) The blow-water neutralization device can obtain the amount of CO2 absorbed, so the amount of CO2 absorbed can be displayed and data can be accumulated.

[0015] (5) The blow water neutralization device further includes an alarm means for issuing an alarm if the acid consumption amount of the blow water is equal to or greater than a threshold value at the time of measuring the acid consumption amount of the blow water.

[0016] (5) In the blow-water neutralization device, an alarm is issued when the acid consumption rate exceeds the capacity of the device, allowing early detection of poor neutralization.

[0017] (6) The blow water neutralization device further includes a circulation flow path connected to the tank, a circulation pump that circulates the blow water through the circulation flow path, an inverter that controls the circulation pump, and an inverter control unit that sets the drive frequency of the inverter high if the acid consumption amount of the blow water is equal to or greater than a threshold value.

[0018] In the blow water neutralization device (6), if the acid consumption exceeds the capacity of the device, the inverter operating frequency is increased to increase the pressure and flow rate using the pump. As a result, it can also handle blow water with a high acid consumption. [Effects of the Invention]

[0019] According to the present invention, a blow-underwater neutralization device capable of detecting abnormalities at an early stage can be obtained. [Brief explanation of the drawings]

[0020] [Figure 1]1 is a schematic diagram of a blow underwater neutralization device according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a block diagram showing the control configuration of the blow underwater neutralization device. [Figure 3] 10 is a flowchart showing a control operation for calculating a planned neutralization time in a blow neutralization device. [Figure 4] 10 is a flowchart showing a control operation for calculating the amount of CO2 absorption in the blow-water neutralization device. [Figure 5] 10 is a flowchart showing a control operation (part 1) for determining whether or not the amount of acid consumed in the blow-water neutralization device is equal to or greater than a threshold value. [Figure 6] 10 is a flowchart showing a control operation (part 2) for determining whether or not the amount of acid consumed in the blown water neutralization device is equal to or greater than a threshold value. DETAILED DESCRIPTION OF THE INVENTION

[0021] 1. First embodiment (1) Outline of the blow-underwater neutralization device The blow-type submersion device 1 according to the first embodiment will be described with reference to Figure 1. In each figure, the white triangular portion of each valve indicates the valve body in the open state, and the black triangular portion of each valve indicates the valve body in the closed state.

[0022] The blow water neutralization device 1 neutralizes alkaline blow water 14 from a steam boiler (not shown) with carbon dioxide gas contained in the boiler exhaust gas 15, cools it, and discharges it as treated water that complies with wastewater standards.

[0023] The blow-type submersion device 1 mainly includes a tank 3, an exhaust gas supply device 5, a circulation flow path 6, a circulation pump 7, a water temperature sensor 8, an inverter 9, and a control unit 51 (FIG. 2).

[0024] The blow-water neutralization device 1 further includes a pH sensor 11 and a water level sensor 17 . The blow-water neutralization device 1 further includes an acid consumption sensor 31 .

[0025] (2) Detailed configuration of the blow-underwater neutralization device (2-1) Tank Blow water 14 is stored in the tank 3. Specifically, the blow water 14 is supplied from a steam boiler to the tank 3 through a water supply passage 33. The water supply passage 33 is provided with a water supply valve 34.

[0026] One end of a circulation channel 6 is connected to the bottom of the tank 3. A discharge valve 37 is provided in the circulation channel 6 near the tank 3.

[0027] (2-2) Exhaust gas supply device The exhaust gas supply device 5 is a device that supplies boiler exhaust gas 15 to blow water 14 in the tank 3. The exhaust gas supply device 5 has a boiler exhaust gas supply passage 12 and an ejector 13. The ejector 13 has a blow water supply port 27, a boiler exhaust gas suction port 28 to which the boiler exhaust gas supply passage 12 is connected, and a discharge port 29 connected to the tank 3. The ejector 13 takes in blow water 14 through the blow water supply port 27, and sucks boiler exhaust gas 15 through the boiler exhaust gas suction port 28 and mixes it with the blow water 14. The blow water 14 mixed with the boiler exhaust gas 15 is discharged from the discharge port 29 of the ejector 13 and supplied to the tank 3. The boiler exhaust gas 15 is supplied to the ejector 13 or stopped by opening and closing a boiler exhaust gas supply valve 19 and an air valve 20 provided in the boiler exhaust gas supply passage 12.

[0028] (2-3) Circulation flow path Both ends of the circulation flow path 6 are connected to the tank 3. The circulation flow path 6 is a flow path through which the blown water 14 in the tank 3 is circulated and neutralized and cooled in the neutralization and cooling step.

[0029] (2-4) Circulation pump The circulation pump 7 is provided in the circulation flow path 6. The circulation pump 7 circulates the blown water 14 in the tank 3 in the neutralization and cooling step.

[0030] (2-5) Inverter The inverter 9 adjusts the operating frequency of the circulation pump 7. Specifically, the inverter 9 controls the rotation speed of a motor (not shown) of the circulation pump 7 by adjusting the frequency of the power supplied to the motor. This changes the flow rate of the blown water 14.

[0031] (2-6) Water temperature sensor The water temperature sensor 8 is provided on the suction side (primary side) of the circulation pump 7 in the circulation flow path 6. The water temperature sensor 8 detects the temperature of the blown water 14 flowing through the circulation flow path 6. The water temperature sensor 8 is specifically a thermocouple.

[0032] (2-7) Cooling device The cooling device 16 is provided in the circulation flow path 6. Specifically, the cooling device 16 is disposed downstream of the circulation pump 7. The cooling device 16 is a heat exchanger.

[0033] The cooling device 16 has a cooling water inlet 21 into which cooling water 38 flows, and a cooling water outlet 22 from which the heat-exchanged cooling water 38 is discharged. A cooling water supply passage 23 is connected to the cooling water inlet 21, and a cooling water supply valve 24 is provided in the cooling water supply passage 23. A cooling water discharge passage 25 is connected to the cooling water outlet 22, and a cooling water discharge valve 26 is provided in the cooling water discharge passage 25.

[0034] (2-8) pH sensor The pH sensor 11 is provided in the circulation flow path 6. Specifically, the pH sensor 11 is disposed upstream of the circulation pump 7. The pH sensor 11 detects the pH of the blow water 14 flowing through the circulation flow path 6.

[0035] (2-9) Water level sensor The water level sensor 17 detects the water level of the blow water 14 in the tank 3. The water level sensor 17 has a plurality of electrodes.

[0036] (2-10) Discharge flow path and discharge valve The blow water neutralization device 1 further has a discharge flow path 42 and a three-way valve 43. The discharge flow path 42 is a flow path for discharging the blow water 14 from the circulation flow path 6. The discharge flow path 42 is connected downstream of the circulation pump 7. The three-way valve 43 is disposed at the connection between the circulation flow paths 6 and 42. The three-way valve 43 is an automatic valve that can switch the supply destination of the blow water 14 flowing through the circulation flow path 6 between the cooling device 16 side and the discharge flow path 42 side. The three-way valve 43 allows the blow water 14 from the circulation pump 7 to flow selectively to either the cooling device 16 side or the discharge flow path 42 side.

[0037] (2-11) Acid consumption sensor The acid consumption sensor 31 is a sensor that detects the amount of acid consumed in the blowdown water 14. The acid consumption is called the pH 8.3 consumption or P alkalinity (mgCaCO3 / L) and is the amount of acid required to neutralize water to a pH of 8.3. The acid consumption is measured, for example, by titration (color change, colorimetry) using a phenolphthalein solution.

[0038] Specifically, the acid consumption sensor 31 detects the amount of acid consumed by the blow water 14 in the circulation flow path 6 that connects the tank 3 and the exhaust gas supply device 5.

[0039] (2-12) Alarm device The alarm device 55 issues an alarm. The type of alarm is, for example, the output of character data, audio data, or image data. The alarm device 55 and the control unit 51, which will be described later, constitute an alarm means.

[0040] (3) Control configuration The control configuration of the blow underwater neutralization device 1 will be described with reference to Fig. 2. Fig. 2 is a block diagram showing the control configuration of the blow underwater neutralization device 1. The blow underwater neutralization device 1 has a control unit 51.

[0041] The control unit 51 is a computer system having a processor (e.g., a CPU), a storage device (e.g., a ROM, a RAM, a HDD, an SSD, etc.), and various interfaces (e.g., an A / D converter, a D / A converter, a communication interface, etc.) The control unit 51 performs various control operations by executing programs stored in the storage unit (corresponding to part or all of the storage area of ​​the storage device).

[0042] As shown in FIG. 2, the control unit 51 includes a planned neutralization time calculation unit 52, a neutralization time measurement unit 53, a comparison unit 54, a CO2 absorption amount calculation unit 56, an inverter control unit 57, an acid consumption amount determination unit 58, and an output unit 59.

[0043] The planned neutralization time calculation unit 52 calculates the planned neutralization time required for the exhaust gas supply device 5 to neutralize the blowdown water 14 based on the detection result of the acid consumption sensor 31 before or during the neutralization process.

[0044] The neutralization time measurement unit 53 measures the neutralization time actually taken for the exhaust gas supply device 5 to neutralize the blow water 14. The neutralization time measurement unit 53 can measure the pH of the blow water 14 based on the output signal from the pH sensor 11.

[0045] The comparison unit 54 compares the planned neutralization time with the measured neutralization time. Therefore, by comparing the planned neutralization time with the measured neutralization time, any malfunction of the blow-type submersion neutralization device 1 can be discovered early.

[0046] The CO2 absorption amount calculation unit 56 calculates the CO2 absorption amount in the blow water 14 based on the acid consumption amount in the blow water 14 and the neutralization operation time of the exhaust gas supply device 5. In this case, since the CO2 absorption amount is obtained, it is possible to display the CO2 absorption amount and store the data.

[0047] The inverter control unit 57 calculates a drive frequency for driving the circulation pump 7, and outputs to the inverter 9 a current value signal corresponding to the calculated value of the drive frequency.

[0048] The acid consumption determining unit 58 determines whether the acid consumption amount is equal to or greater than a threshold value corresponding to the neutralization capacity of the blow water neutralization device 1 during the neutralization process.

[0049] The output unit 59 is a device that outputs the CO2 absorption amount (described later) to, for example, an external device or an internal storage unit (not shown).

[0050] The control unit 51 can also send control signals to the boiler exhaust gas supply valve 19, the air valve 20, the water supply valve 34, the three-way valve 43, and other devices.

[0051] As shown in FIG. 2, the control unit 51 is capable of receiving detection signals from the acid consumption amount sensor 31 and the pH sensor 11.

[0052] (4) Basic process of blow-underwater neutralization equipment The basic process of the blow-type underwater neutralization device 1 will be explained using FIG.

[0053] (4-1) Storage process The storage process will be explained using FIG.

[0054] Blow water 14 from the steam boiler is stored in the tank 3 through the water supply passage 33 by opening the water supply valve 34. When the stored blow water 14 reaches a predetermined water level, it is transferred to the neutralization and cooling process.

[0055] (4-2) Neutralization / cooling process The neutralization and cooling process will be explained using FIG.

[0056] (4-2-1) Overview of the neutralization and cooling process When the discharge valve 37 is opened, the blow water 14 in the tank 3 circulates through the circulation flow path 6. Then, the blow water 14 is cooled by the cooling device 16 and neutralized by the ejector 13.

[0057] In the blow water neutralization device 1, the cooling by the cooling device 16 is controlled by the control unit 51 based on the water temperature of the blow water 14 detected by the water temperature sensor 8. In addition, the neutralization by the ejector 13 is controlled by the control unit 51 based on the pH of the blow water 14 detected by the pH sensor 11.

[0058] As described above, while the blow water 14 in the tank 3 circulates through the circulation flow path 6, cooling control and neutralization control are performed separately until the water temperature and pH meet the wastewater standards.

[0059] (4-2-2) Details of the cooling process The cooling of the blow water 14 will now be described in detail. When the temperature of the blow water 14 detected by the water temperature sensor 8 exceeds a predetermined value set forth in the drainage standard, the control unit 51 opens the cooling water supply valve 24. As a result, cooling water 38 is supplied from the cooling water inlet 21 to the outside of the internal flow path via the cooling water supply flow path 23. The blow water 14 is introduced into the internal flow path of the cooling device 16. In this state, the cooling water 38 removes heat from the blow water 14 and is discharged from the cooling water outlet 22. The cooled blow water 14 is discharged from the cooling device 16 to the circulation flow path 6.

[0060] On the other hand, when the temperature of the blow-off water 14 detected by the water temperature sensor 8 falls below a predetermined value defined by the drainage standard, the control unit 51 closes the cooling water supply valve 24. As a result, the supply of cooling water to the cooling device 16 is cut off, and the cooling of the blow-off water 14 is stopped.

[0061] (4-2-3) Details of the neutralization process The neutralization of the blow water 14 will now be described in detail. When the pH of the blow water 14 detected by the pH sensor 11 exceeds a predetermined value specified by the wastewater standards, the blow water 14 is neutralized by the action of the ejector 13 with the boiler flue gas 15 supplied from the boiler flue gas supply passage 12. Specifically, the control unit 51 opens the boiler flue gas supply valve 19 and closes the air valve 20. As a result, the ejector 13 takes in the blow water 14 from the blow water supply port 27 and sucks the boiler flue gas 15 supplied from the boiler flue gas supply passage 12 through the boiler flue gas suction port 28, mixing the blow water 14 with the boiler flue gas 15. This allows the blow water 14 and the boiler flue gas 15 to come into efficient contact with each other, and further agitates the blow water 14 due to the turbulence effect generated in the ejector 13, thereby dissolving the boiler flue gas 15 in the blow water 14 and neutralizing it. Then, the blown water 14 is discharged from the discharge port 29 and returned to the tank 3.

[0062] On the other hand, when the pH of the blow water 14 detected by the pH sensor 11 falls below a predetermined value set forth in the wastewater standards, the control unit 51 closes the boiler exhaust gas supply valve 19 and opens the air valve 20. As a result, outside air is drawn into the ejector 13, and the neutralization of the blow water 14 is stopped. In this way, drawing in outside air when the boiler exhaust gas 15 is not being supplied suppresses vibrations caused by pressure fluctuations that occur inside the ejector 13.

[0063] (4-2-4) Drainage process The drainage process will be explained using Figure 1.

[0064] When the values ​​detected by the water temperature sensor 8 and the pH sensor 11 reach the water temperature and pH levels that comply with the wastewater standards, respectively, the three-way valve 43 is opened. As a result, the blown water 14 is discharged outside the system via the discharge flow path 42.

[0065] (5) Comparison of planned neutralization time and measured neutralization time (after the neutralization process) Using FIG. 3, the control operation for comparing the planned neutralization time with the measured neutralization time after the neutralization step will be described.

[0066] The control flowcharts described below are merely examples, and steps can be omitted or replaced as necessary. Furthermore, multiple steps can be executed simultaneously, or some or all of the steps can be executed in an overlapping manner.

[0067] Furthermore, each block in the control flowchart is not limited to a single control operation, but can be replaced with a plurality of control operations represented by a plurality of blocks.

[0068] In step S1, the amount of acid consumed in the blow water 14 is detected before or during the neutralization process. Specifically, the acid consumption sensor 31 detects the amount of acid consumed in the blow water 14 in the tank 3, and the control unit 51 determines the amount of acid consumed.

[0069] In step S2, the expected neutralization time is calculated. Specifically, the expected neutralization time calculation unit 52 of the control unit 51 executes the above operation based on the acid consumption amount of the blowdown water 14. The expected neutralization time can be determined from the acid consumption amount because the boiler exhaust gas 15 is sucked in by the ejector 13 at a fixed amount.

[0070] In step S3, the neutralization process is performed or continued. When the neutralization process is completed, the process proceeds to step S4. During the neutralization process, the neutralization time is measured. Specifically, the neutralization time measurement unit 53 of the control unit 51 measures the neutralization time based on the detection result of the pH sensor 11. Hereinafter, the measured actual neutralization time will be referred to as the "measured neutralization time."

[0071] In step S4, the planned neutralization time is compared with the measured neutralization time, and it is determined whether the measured neutralization time is longer than the planned neutralization time or a comparison time (e.g., acid consumption amount x safety factor (variable setting)) prepared based on the planned neutralization time. Specifically, the comparison unit 54 compares the two.

[0072] If the measured neutralization time is longer than the scheduled neutralization time or the comparison time, the process proceeds to step S5. If the measured neutralization time is equal to or shorter than the scheduled neutralization time or the comparison time, the process skips step S5 and ends.

[0073] In step S5, an alarm is issued. Specifically, the comparison unit 54 drives the alarm device 55 to issue an alarm. In other words, the comparison unit 54 and the alarm device 55 constitute an alarm means.

[0074] Generally, if the measured neutralization time is longer than the scheduled neutralization time or the comparison time, there is a possibility that the blow water neutralization device 1 is abnormal (a decrease in the blow water circulation flow rate due to pump deterioration, ejector deterioration, heat exchanger clogging, etc., or a decrease in the pH sensor reaction rate), which is likely to result in poor neutralization. In this embodiment, an alarm can be issued to detect an abnormality before the degree of inability to neutralize becomes extremely severe. For example, if the scheduled neutralization time is 4 minutes and the measured neutralization time exceeds 4 minutes x 1.2 (safety factor) = 4.8 minutes, an alarm can be issued.

[0075] In order to avoid erroneous determination, an alarm may be issued when abnormal comparison results are detected a predetermined number of times.

[0076] (6) Calculation of CO2 absorption amount (after neutralization process) Using FIG. 4, the control operation for calculating the amount of CO2 absorption after the neutralization step will be described.

[0077] In step S1, the amount of acid consumed in the blow water 14 is detected before or during the neutralization process. Specifically, the acid consumption sensor 31 detects the amount of acid consumed in the blow water 14 in the tank 3, and the control unit 51 determines the amount of acid consumed.

[0078] In step S7, the neutralization step is carried out or continued. Once the neutralization step is completed, the process proceeds to step S8.

[0079] In step S8, the CO2 absorption amount (the amount of CO2 absorbed by the blow water 14 in the neutralization process, i.e., the amount of exhaust gas used in the neutralization process) is calculated. Specifically, the CO2 absorption amount calculation unit 56 calculates the CO2 absorption amount based on the acid consumption amount. The principle of CO2 absorption amount calculation is that if the acid consumption amount is known and neutralization is completed normally, it means that a predetermined amount of CO2 has been consumed (a predetermined amount of exhaust gas has been sucked in).

[0080] In step S9, the CO2 absorption amount is output. Specifically, the output unit 59 outputs the CO2 absorption amount to an external device or an internal storage unit.

[0081] Furthermore, by installing a watt-hour meter at the base of the electrical control unit (not shown) of the blow-water neutralization device 1, the amount of CO2 emissions can be determined by multiplying the amount of power consumed by the CO2 emission coefficient for electricity. Based on this, the CO2 balance in the blow-water neutralization device 1 can be calculated based on the amount of CO2 absorbed and emitted. Furthermore, it is possible to display the amount of CO2 absorbed, emitted, and balance, and to manage trends in the balance by accumulating data.

[0082] (7) Detection of Neutralization Failure Using Acid Consumption During the Neutralization Process (Part 1) The control operation for detecting poor neutralization during the neutralization process and issuing an alarm will be described with reference to FIG.

[0083] In step S10, measurement of the acid consumption amount of the blow water 14 is started. Specifically, the acid consumption amount sensor 31 starts the operation of detecting the acid consumption amount of the blow water 14 in the tank 3.

[0084] In step S11, the neutralization step is started.

[0085] In step S12, the amount of acid consumed by the blow water 14 during the neutralization process is detected. Specifically, the acid consumption sensor 31 detects the amount of acid consumed by the blow water 14 in the tank 3.

[0086] In step S13, it is determined whether the amount of acid consumed is equal to or greater than a threshold value corresponding to the neutralization capacity of the blown water neutralization apparatus 1. Specifically, the acid consumption determination unit 58 makes this determination based on the amount of acid consumed. If the amount of acid consumed is less than the threshold value, the process proceeds to step S14. If the amount of acid consumed is equal to or greater than the threshold value, the process proceeds to step S15.

[0087] In step S14, it is determined whether neutralization is complete. Specifically, the neutralization time measurement unit 53 determines whether the pH of the blow water 14 has reached a predetermined value based on the output signal from the pH sensor 11. If neutralization is complete, the process ends. If neutralization is not complete, the process proceeds to step S16.

[0088] In step S15, an alarm is issued. Specifically, for example, the acid consumption determination unit 58 drives the alarm device 55 to issue the alarm. In other words, the acid consumption determination unit 58 and the alarm device 55 constitute an alarm means. In this case, an alarm is issued when the acid consumption exceeds the capacity of the blow-water neutralization device 1, allowing early detection of poor neutralization. Next, the process proceeds to step S14.

[0089] In step S16, an alarm is issued. Specifically, for example, the neutralization time measurement unit 53 activates the alarm device 55 to issue an alarm if the neutralization is not completed. The process then returns to step S14.

[0090] (8) Detection of Neutralization Failure Using Acid Consumption During the Neutralization Process (Part 2) Using FIG. 6, a control operation for detecting a neutralization failure during the neutralization step and increasing the pressure and flow rate of the circulating pump 7 will be described.

[0091] In step S10, an operation is started to measure the amount of acid consumed by the blow water 14. Specifically, the acid consumption sensor 31 starts an operation to detect the amount of acid consumed by the blow water 14 in the tank 3.

[0092] In step S11, the neutralization step is started.

[0093] In step S12, the amount of acid consumed by the blow water 14 during the neutralization process is detected. Specifically, the acid consumption sensor 31 detects the amount of acid consumed by the blow water 14 in the tank 3.

[0094] In step S13, it is determined whether the amount of acid consumed is equal to or greater than a threshold value corresponding to the neutralization capacity of the blown water neutralization apparatus 1. Specifically, the acid consumption determination unit 58 makes this determination based on the amount of acid consumed. If the amount of acid consumed is less than the threshold value, the process proceeds to step S14. If the amount of acid consumed is equal to or greater than the threshold value, the process proceeds to step S17.

[0095] In step S14, it is determined whether the neutralization is complete. If the neutralization is complete, the process ends. If the neutralization is not complete, the process proceeds to step S16.

[0096] In step S17, the inverter frequency is changed. Specifically, the inverter control unit 57 sets the drive frequency of the inverter 9 to a high value based on the determination result of the acid consumption determination unit 58. In this case, if the acid consumption exceeds the capacity of the blow water neutralization device 1, the operating frequency of the inverter 9 is increased (for example, from 50 Hz to 60 Hz), thereby increasing the pressure and flow rate by the circulation pump 7. As a result, it is possible to handle blow water 14 with a large acid consumption. Next, the process proceeds to step S14.

[0097] In step S16, an alarm is issued. Specifically, for example, the neutralization time measurement unit 53 activates the alarm device 55 to issue an alarm if the neutralization is not completed. The process then returns to step S14.

[0098] 2. Other Embodiments Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible within the scope of the gist of the invention. In particular, the multiple embodiments and modifications described in this specification can be arbitrarily combined as necessary.

[0099] The acid consumption sensor 31 may detect the amount of acid consumed by the blow water 14 in the circulation flow path 6 that connects the tank 3 and the exhaust gas supply device 5.

[0100] The above (5) to (8) may be executed independently, or any of (2) to (4) may be executed in appropriate combination.

[0101] 3. Contribution to the United Nations-led Sustainable Development Goals (SDGs) This disclosure includes matters that contribute to achieving Goal 6 of the Sustainable Development Goals (SDGs), "Clean water and sanitation," and Goal 13, "Climate action." [Explanation of symbols]

[0102] 1: Blow underwater neutralization device 3: Tank 5: Exhaust gas supply device 6: Circulation channel 7: Circulation pump 13: Ejector 14: Blow water 15: Boiler exhaust gas 31: Acid consumption sensor 51: Control unit 52: Planned neutralization time calculation unit 53: Neutralization time measurement unit 54: Comparison section 55:Alarm device 56: CO2 absorption calculation section 57: Inverter control unit

Claims

1. 1. An apparatus for neutralizing blow water using boiler exhaust gas, comprising: a tank for storing the blow water; an exhaust gas supply device for supplying the boiler exhaust gas to the blow water; an acid consumption sensor that detects an acid consumption amount of the blow water in the tank or the blow water in a circulation flow path that connects the tank and the exhaust gas supply device; a planned neutralization time calculation unit that calculates a planned neutralization time required for the exhaust gas supply device to neutralize the blow water based on the measurement result of the acid consumption sensor; and A blow-underwater neutralization device.

2. a neutralization time measurement unit that measures a neutralization time that is actually required for the exhaust gas supply device to neutralize the blow water; The blow-under neutralization device according to claim 1 , further comprising a comparison unit that compares the planned neutralization time with the measured neutralization time.

3. A blow-underwater neutralization device as described in claim 2, further comprising an alarm means for issuing an alarm if the comparison result of the comparison unit shows that the measured neutralization time is longer than the planned neutralization time or a comparison time created based on the planned neutralization time.

4. Based on the acid consumption amount of the blow water and the neutralization operation time of the exhaust gas supply device, ２ Calculate the absorption amount of CO ２ The blow-water neutralization device according to claim 1 or 2, further comprising an absorption amount calculation unit.

5. 3. The blow water neutralization device according to claim 1, further comprising an alarm means for issuing an alarm if the acid consumption amount of the blow water is equal to or greater than a threshold value at the time when the acid consumption amount of the blow water is measured.

6. a circulation flow path connected to the tank; a circulation pump that circulates the blow water through the circulation flow path; an inverter that controls the circulation pump; 3. The blow water neutralization device according to claim 1, further comprising an inverter control unit that sets a driving frequency of the inverter to a high value when an acid consumption amount of the blow water is equal to or greater than a threshold value.

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