Exhaust gas treatment system, dust collection device, and method for controlling exhaust gas treatment system

Abstract

This exhaust gas treatment system comprises: a cooling tower for cooling exhaust gas containing carbon dioxide; an absorption tower into which an absorbing liquid capable of absorbing the carbon dioxide contained in the exhaust gas is introduced and in which the absorbing liquid is caused to absorb the carbon dioxide contained in the exhaust gas that has passed through the cooling tower; a regeneration tower in which the absorbing liquid that has absorbed the carbon dioxide is heated to separate the carbon dioxide from the absorbing liquid to thereby regenerate the absorbing liquid; a wet electric dust collector by which floating particulate substances including sulfur trioxide (SO3) contained in the exhaust gas are electrically charged and collected; detection parts; and a control device. The control device includes a charging-output regulation part for regulating the charging output of the wet electric dust collector on the basis of at least one of the following concentrations detected by the detection parts: the soot / dust concentration of the exhaust gas; the ozone concentration of the exhaust gas; the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower; and the concentration of the floating particulate substances in the exhaust gas.

Description

Exhaust gas treatment system, dust collector, and control method for exhaust gas treatment system

[0001] This application claims priority to U.S. application Ser. No. 18 / 733,969, filed Jun. 5, 2024, the contents of which are incorporated herein by reference.

[0002] It is desirable to reduce the amount of carbon dioxide emissions contained in exhaust gases from ships, power plants, and other plants. For this reason, for example, Patent Document 1 discloses an exhaust gas treatment system that recovers carbon dioxide contained in exhaust gases. In this exhaust gas treatment system, sulfur oxides are removed from the exhaust gas, and then the exhaust gas is introduced into an absorption tower and brought into contact with an absorbing solution to recover carbon dioxide. This exhaust gas treatment system also removes suspended particulate matter (mist-generating substances) contained in the exhaust gas, including sulfur trioxide (SO3), which is a source of mist that is absorbed into the absorbing solution in the absorption tower and dispersed outside the system, by charging the suspended particulate matter with a wet electrostatic precipitator.

[0003] Patent No. 6045652

[0004] However, in the exhaust gas treatment system described in Patent Document 1, if the wet electrostatic precipitator is excessively charged, the amount of suspended particulate matter increases, which may adversely affect the treatment performance of the exhaust gas.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide an exhaust gas treatment system, a dust collection device, and a control method for an exhaust gas treatment system that can suppress adverse effects on exhaust gas treatment performance.

[0006] In order to solve the above problems, an exhaust gas treatment system according to the present disclosure includes a cooling tower that cools exhaust gas containing carbon dioxide by bringing a cooling liquid into contact with the exhaust gas, an absorption tower into which an absorption liquid capable of absorbing carbon dioxide in the exhaust gas is introduced and in which the absorption liquid absorbs the carbon dioxide in the exhaust gas that has passed through the cooling tower, a regeneration tower that heats the absorption liquid that has absorbed carbon dioxide, separates the carbon dioxide from the absorption liquid, and regenerates the absorption liquid, and a cooling tower that measures the soot concentration of the exhaust gas, the ozone concentration of the exhaust gas, and the concentration of volatile organic compounds (VOCs) in the exhaust gas discharged from the absorption tower. and a control device that controls a charging output in the wet electrostatic precipitator, the control device including a charging output adjustment unit that adjusts the charging output in the wet electrostatic precipitator based on at least one of the soot concentration in the exhaust gas detected by the detection unit, the ozone concentration in the exhaust gas, the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower, and the concentration of the suspended particulate matter in the exhaust gas.

[0007] The dust collector according to the present disclosure is a dust collector provided in an exhaust gas treatment system including a cooling tower that cools exhaust gas containing carbon dioxide by bringing a cooling liquid into contact with the exhaust gas, an absorption tower into which an absorption liquid capable of absorbing carbon dioxide in the exhaust gas is introduced and which causes the absorption liquid to absorb the carbon dioxide in the exhaust gas that has passed through the cooling tower, and a regeneration tower that heats the absorption liquid that has absorbed carbon dioxide and separates the carbon dioxide from the absorption liquid to regenerate the absorption liquid, and the dust collector is provided in an exhaust gas treatment system including a wet electrostatic precipitator that collects suspended particulate matter containing sulfur trioxide by charging the suspended particulate matter, and a dust concentration of the exhaust gas. the control device includes a detection unit that detects at least one of the ozone concentration of the exhaust gas, the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower, and the concentration of suspended particulate matter in the exhaust gas, and a control device that controls the charging output of the wet electrostatic precipitator, and the control device includes a charging output adjustment unit that adjusts the charging output of the wet electrostatic precipitator based on at least one of the soot concentration of the exhaust gas, the ozone concentration of the exhaust gas, the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower, and the concentration of suspended particulate matter in the exhaust gas detected by the detection unit.

[0008] The control method for an exhaust gas treatment system according to the present disclosure is a control method for an exhaust gas treatment system as described above, and includes the steps of acquiring information including at least one of the soot concentration in the exhaust gas containing carbon dioxide, the ozone concentration in the exhaust gas, the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower, and the concentration of suspended particulate matter in the exhaust gas, and adjusting the charging output in the wet electrostatic precipitator based on at least one of the soot concentration in the exhaust gas, the ozone concentration in the exhaust gas, the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower, and the concentration of suspended particulate matter in the exhaust gas.

[0009] According to the exhaust gas treatment system, the dust collecting device, and the control method for the exhaust gas treatment system of the present disclosure, it is possible to suppress adverse effects on the treatment performance of the exhaust gas.

[0010] FIG. 1 is a diagram showing a configuration of an exhaust gas treatment system according to a first embodiment of the present disclosure. FIG. 2 is a diagram showing a hardware configuration of a control device of the exhaust gas treatment system according to an embodiment of the present disclosure. FIG. 3 is a functional block diagram of the control device of the exhaust gas treatment system according to the first embodiment of the present disclosure. FIG. 4 is a diagram showing an example of correlation information stored in the control device according to an embodiment of the present disclosure. FIG. 5 is a flowchart showing the flow of a control method for the exhaust gas treatment system according to an embodiment of the present disclosure. FIG. 6 is a diagram showing a configuration of an exhaust gas treatment system according to a second embodiment of the present disclosure. FIG. 7 is a functional block diagram of the control device of the exhaust gas treatment system according to the second and third embodiments of the present disclosure. FIG. 8 is a diagram showing a configuration of an exhaust gas treatment system according to a third embodiment of the present disclosure.

[0011] Hereinafter, with reference to the accompanying drawings, embodiments for implementing an exhaust gas treatment system, a dust collector, and a control method for an exhaust gas treatment system according to the present disclosure will be described. However, the present disclosure is not limited to these embodiments. <First Embodiment> (Configuration of Exhaust Gas Treatment System) An exhaust gas treatment system 10A shown in FIG. 1 is connected to a gas emission source (not shown) that emits exhaust gas containing carbon dioxide, and is installed in a plant such as a ship or a power plant. Specifically, in the case of a ship, the gas emission source is, for example, an internal combustion engine used as a main engine for propelling the ship, an internal combustion engine used in a power generation facility that supplies electricity to the ship, or a boiler that generates steam. In addition, in the case of a power plant, the gas emission source is a blast furnace. In such a gas emission source, exhaust gas generated by burning fuel contains carbon dioxide and sulfur components such as sulfur dioxide (SO2).

[0012] The flue gas treatment system 10A recovers carbon dioxide contained in flue gas from a gas emission source, and includes a cooling tower 11, an absorption tower 12, a regeneration tower 13, a recovery unit 15, and a dust collector 20A.

[0013] The cooling tower 11 cools the exhaust gas from the gas emission source with a cooling liquid L1. If the gas emission source is provided on a ship, the water around the ship or fresh water stored in a fresh water tank (not shown) provided on the ship can be used as the cooling liquid L1. If the gas emission source is provided on a plant such as a power plant, for example, seawater, river water, industrial water, etc. can be used as the cooling liquid L1.

[0014] One end of a gas introduction line 101 is connected to the bottom of the cooling tower 11. The gas introduction line 101 is provided at the inlet of the flue gas treatment system 10A, and flue gas is fed into the gas introduction line 101 from a gas emission source (not shown) outside the flue gas treatment system 10A. The other end of the gas introduction line 101 is connected to a desulfurization device (not shown) provided between the gas emission source and the cooling tower 11. The desulfurization device removes sulfur components such as SO2 contained in the flue gas.

[0015] The cooling tower 11 includes a tower body 11a and a nozzle 11b that sprays a cooling liquid L1 from the top of the tower body 11a. A cooling liquid supply line 102 that circulates the cooling liquid L1 is connected to the cooling tower 11. One end of the cooling liquid supply line 102 is connected to the bottom of the tower body 11a. The other end of the cooling liquid supply line 102 is connected to the nozzle 11b at the top of the tower body 11a.

[0016] A coolant supply pump 31 and a first heat exchanger 41 are provided along the coolant supply line 102. The coolant supply pump 31 sucks the coolant L1 accumulated at the bottom of the tower body 11a out of the tower body 11a and supplies it to a nozzle 11b at the top of the tower body 11a. The coolant L1 supplied to the nozzle 11b is sprayed into the tower body 11a from the nozzle 11b and comes into contact (gas-liquid contact) with the flue gas sent into the tower body 11a. This cools the flue gas, and soot and dust contained in the flue gas are captured and washed away by the coolant L1.

[0017] The first heat exchanger 41 exchanges heat between the coolant L1 flowing in the coolant supply line 102 and the cooling water flowing in the refrigerant line 107, thereby cooling the coolant L1.

[0018] One end of an exhaust gas discharge line 103 is connected to the top of the tower body 11a. The exhaust gas discharge line 103 sends the exhaust gas, which has been cooled by washing away soot and dust with a cooling liquid inside the tower body 11a, to the absorption tower 12.

[0019] The absorption tower 12 absorbs carbon dioxide contained in the flue gas into the absorption liquid L2. The absorption tower 12 includes a tower body 12a and nozzles 12b and 12c. The nozzle 12b sprays the absorption liquid L2 into the tower body 12a and brings it into gas-liquid contact with the flue gas, thereby removing carbon dioxide from the flue gas. The nozzle 12c sprays wash water into the tower body 12a and brings it into contact with the flue gas from which carbon dioxide has been removed, rising inside the tower body 12a, thereby recovering the absorption liquid L2 sprayed from the nozzle 12b and contained in the flue gas. The other end of the flue gas discharge line 103 is connected to the bottom of the tower body 12a. The flue gas that has passed through the cooling tower 11 is sent into the tower body 12a through the flue gas discharge line 103.

[0020] The nozzle 12b is provided in the lower part of the absorption tower 12. The nozzle 12c is provided in the upper part of the absorption tower 12. The absorbing liquid L2 is supplied to the nozzle 12b from the regeneration tower 13 via a circulation line 106 described later.

[0021] A wash water circulation line 105 for circulating wash water is connected to the absorption tower 12. One end of the wash water circulation line 105 is connected to the middle of the tower body 12a. The other end of the wash water circulation line 105 is connected to a nozzle 12c in the tower body 12a at the top of the tower body 12a. A wash water circulation pump 33 and a second heat exchanger 43 are provided along the wash water circulation line 105. The wash water circulation pump 33 sucks wash water from above a wash water receiver 12d provided in the middle of the tower body 12a and supplies it to the nozzle 12c at the top of the tower body 12a.

[0022] The absorption liquid L2 supplied to the nozzle 12b is sprayed into the tower body 12a and comes into contact with the flue gas sent into the tower body 12a. As a result, carbon dioxide contained in the flue gas is absorbed by the absorption liquid L2 in the tower body 12a of the absorption tower 12.

[0023] A cooling water supply pipe 82A is connected to the second heat exchanger 43. Cooling water is supplied to the second heat exchanger 43 from outside the exhaust gas treatment system 10A through this cooling water supply pipe 82A. The second heat exchanger 43 exchanges heat between the cooling water supplied from outside the exhaust gas treatment system 10A and the cleaning water flowing in the cleaning water circulation line 105. In other words, the second heat exchanger 43 cools the cleaning water circulating in the cleaning water circulation line 105 with the cooling water supplied from outside the exhaust gas treatment system 10A. The cleaning water cooled by the second heat exchanger 43 is sprayed into the tower body 12a from nozzles 12c at the top of the tower body 12a.

[0024] One end of an exhaust pipe 12e is connected to the top of the tower body 12a. The exhaust pipe 12e guides the exhaust gas that has left the absorption tower 12, in other words, the exhaust gas from which the absorbing liquid L2 has been removed by the absorption tower 12, to, for example, an exhaust funnel (not shown) or the like, and releases it into the atmosphere.

[0025] The regeneration tower 13 separates gaseous carbon dioxide from the absorption solution L2 that has absorbed carbon dioxide in the absorption tower 12. The regeneration tower 13 includes a tower body 13a, a nozzle 13b that sprays the absorption solution L2 into the tower body 13a, and a nozzle 13c that sprays the returned condensed water. The nozzle 13b is provided at the bottom of the tower body 13a. The nozzle 13c is provided at the top of the tower body 13a.

[0026] A circulation line 106 is provided between the absorption tower 12 and the regeneration tower 13. The circulation line 106 circulates the absorption liquid L2 between the absorption tower 12 and the regeneration tower 13. The circulation line 106 includes an absorption liquid supply line 106A, an absorption liquid discharge line 106B, and a heat exchanger 45.

[0027] One end of the absorbing liquid supply line 106A is connected to the bottom of the tower body 13a of the regenerator 13. The other end of the absorbing liquid supply line 106A is connected to a nozzle 12b in the tower body 12a of the absorption tower 12. A first circulation pump 32A and a third heat exchanger 46 are provided along the absorbing liquid supply line 106A. The first circulation pump 32A sucks the absorbing liquid L2 from the bottom of the tower body 13a of the regenerator 13 through the absorbing liquid supply line 106A and supplies it to the nozzle 12b of the tower body 12a of the absorption tower 12.

[0028] A cooling water supply pipe 82B is connected to the third heat exchanger 46. Cooling water is supplied to the third heat exchanger 46 from outside the flue gas treatment system 10A through the cooling water supply pipe 82B. The third heat exchanger 46 exchanges heat between the cooling water supplied from outside the flue gas treatment system 10A and the absorption liquid L2 flowing through the absorption liquid supply line 106A. In other words, the third heat exchanger 46 cools the absorption liquid L2 supplied to the absorber 12 through the absorption liquid supply line 106A using the cooling water supplied from outside the flue gas treatment system 10A. The absorption liquid L2 cooled by the third heat exchanger 46 is sprayed into the tower body 12a from the nozzles 12b of the absorber 12.

[0029] One end of the absorbent discharge line 106B is connected to the bottom of the tower body 12a of the absorption tower 12. The other end of the absorbent discharge line 106B is connected to a nozzle 13b provided in the tower body 13a of the regeneration tower 13. A second circulation pump 32B is provided midway along the absorbent discharge line 106B. The second circulation pump 32B sucks the absorbent L2 from the bottom of the tower body 12a of the absorption tower 12 through the absorbent discharge line 106B and supplies it to the nozzle 13b of the tower body 13a of the regeneration tower 13.

[0030] The heat exchanger 45 exchanges heat between the absorption liquid L2 flowing in the absorption liquid supply line 106A and the absorption liquid L2 flowing in the absorption liquid discharge line 106B. In other words, the heat of the absorption liquid L2 immediately after the carbon dioxide is separated by the regeneration tower 13 heats the absorption liquid L2 that has absorbed carbon dioxide before being introduced into the regeneration tower 13.

[0031] The regeneration tower 13 separates gaseous carbon dioxide from the absorption solution L2 that has absorbed carbon dioxide in the absorption tower 12. To this end, the regeneration tower 13 heats, by an absorption solution heating line 108, the absorption solution L2 that has been sent from the absorption tower 12 to the regeneration tower 13 via an absorption solution discharge line 106B.

[0032] The absorption solution heating line 108 is connected to the regeneration tower 13. The absorption solution heating line 108 circulates the absorption solution L2 between the regeneration tower 13 and the reboiler 48. That is, the absorption solution heating line 108 supplies the absorption solution L2 taken out from the regeneration tower 13 to the reboiler 48, and returns the absorption solution L2 from the reboiler 48 to the regeneration tower 13. In other words, the reboiler 48 is provided midway along the absorption solution heating line 108.

[0033] A steam supply pipe 81 is connected to the reboiler 48. Steam supplied from a boiler (not shown) or the like provided outside the exhaust gas treatment system 10A is sent to the reboiler 48 through the steam supply pipe 81. The reboiler 48 exchanges heat between the steam sent through the steam supply pipe 81 and the absorption liquid L2 flowing in the absorption liquid heating line 108. In other words, the reboiler 48 heats the absorption liquid L2 with the heat of the steam.

[0034] The reboiler 48 heats the absorption liquid L2 to separate gaseous carbon dioxide from the absorption liquid L2. The absorption liquid L2 and gaseous carbon dioxide separated by the reboiler 48 are returned to the tower main body 13a through an absorption liquid heating line 108. The absorption liquid L2 from which gaseous carbon dioxide has been separated and regenerated in this manner is returned to the absorption tower 12 through an absorption liquid supply line 106A and reused. Meanwhile, the separated gaseous carbon dioxide is sent to the recovery section 15 through a gaseous carbon dioxide discharge line 109.

[0035] A condenser 49 is provided in the gaseous carbon dioxide discharge line 109. A cooling water supply pipe 82C is connected to the condenser 49. Cooling water is supplied to the condenser 49 from outside the exhaust gas treatment system 10A through the cooling water supply pipe 82C. The condenser 49 condenses moisture contained in the gaseous carbon dioxide by heat exchange with the cooling water supplied from outside the exhaust gas treatment system 10A.

[0036] The recovery unit 15 recovers the gaseous carbon dioxide separated in the regeneration tower 13. The recovery unit 15 is a gas-liquid separator, and separates the gaseous carbon dioxide sent through the condenser 49 from the condensed water resulting from condensation of moisture.

[0037] The condensed water after gas-liquid separation is returned from the bottom of the recovery section 15 to the regeneration tower 13 through a return line 110. A return pump 112 for returning the condensed water to the regeneration tower 13 is provided in the middle of the return line 110. The return line 110 is connected to a nozzle 13c provided at the top of the regeneration tower 13. The condensed water returned to the regeneration tower 13 is sprayed into the tower body 13a from the nozzle 13c of the regeneration tower 13 as absorption liquid L2.

[0038] On the other hand, the gaseous carbon dioxide from which moisture has been removed in the recovery unit 15 is discharged to the outside of the exhaust gas treatment system 10A through the carbon dioxide discharge pipe 111. The gaseous carbon dioxide discharged through the carbon dioxide discharge pipe 111 is stored, for example, in a carbon dioxide recovery tank (not shown). At this time, the gaseous carbon dioxide may be liquefied by an appropriate carbon dioxide liquefaction device and stored in the carbon dioxide recovery tank.

[0039] In the flue gas treatment system 10A as described above, flue gas discharged from a gas emission source (not shown) is washed through a cooling tower 11 and then introduced into an absorption tower 12. In the absorption tower 12, carbon dioxide contained in the flue gas is absorbed by an absorption liquid L2. The flue gas from which carbon dioxide has been separated as a result of the absorption of carbon dioxide by the absorption liquid L2 is released into the atmosphere. In addition, the absorption liquid L2 that has absorbed the carbon dioxide contained in the flue gas in the absorption tower 12 is sent to a regeneration tower 13 via a circulation line 106. The absorption liquid L2 that has absorbed carbon dioxide is heated by a reboiler 48 to increase its temperature, and gaseous carbon dioxide contained in the absorption liquid L2 is separated. The separated gaseous carbon dioxide is recovered via a recovery section 15. Meanwhile, the absorption liquid L2 from which carbon dioxide has been separated in the regeneration tower 13 is circulated to the absorption tower 12 via a circulation line 106.

[0040] (Configuration of Dust Collector) The dust collector 20A collects suspended particulate matter contained in the exhaust gas sent to the absorption tower 12. The dust collector 20A includes a wet electrostatic precipitator 21, detection units 201 and 202, and a control device 60A that adjusts the charging output of the wet electrostatic precipitator 21.

[0041] In this embodiment, the wet electrostatic precipitator 21 is provided, for example, midway along the gas introduction line 101, i.e., upstream of the cooling tower 11. The wet electrostatic precipitator 21 may also be provided in the exhaust gas discharge line 103 downstream of the cooling tower 11. The wet electrostatic precipitator 21 captures suspended particulate matter, including sulfur trioxide, contained in the exhaust gas by charging the suspended particulate matter. The wet electrostatic precipitator 21 has a discharge electrode (not shown). The wet electrostatic precipitator 21 charges the suspended particulate matter in the exhaust gas by discharging from the discharge electrode, thereby capturing the suspended particulate matter by electrostatic force. Here, the suspended particulate matter includes sulfur trioxide droplets (mist) and soot (solid particles) contained in the exhaust gas. The wet electrostatic precipitator 21 recovers the captured suspended particulate matter by contacting it with water.

[0042] The detection units 201 and 202 are provided in the gas introduction line 101 downstream of the wet electrostatic precipitator 21. The detection unit 201 repeatedly detects the soot concentration of the exhaust gas that has passed through the wet electrostatic precipitator 21 at regular time intervals. The detection unit 202 repeatedly detects the ozone concentration of the exhaust gas that has passed through the wet electrostatic precipitator 21 at regular time intervals. The detection units 201 and 202 output the detected concentration detection values ​​to the control device 60A.

[0043] (Hardware Configuration Diagram) Fig. 2 is a diagram showing the hardware configuration of a control device of an exhaust gas treatment system according to an embodiment of the present disclosure. As shown in Fig. 2, the control device 60A is a computer including a processor 61 such as a CPU (Central Processing Unit), a ROM 62 (Read Only Memory), a RAM 63 (Random Access Memory), a storage 64, and a signal transmission / reception module 65. The signal transmission / reception module 65 receives signals related to the detected concentration values ​​of the soot concentration in the exhaust gas that has passed through the wet electrostatic precipitator 21 and the ozone concentration in the exhaust gas that has passed through the wet electrostatic precipitator 21 from each of the detection units 201 and 202.

[0044] (Functional Block Diagram) Figure 3 is a functional block diagram of a control device of an exhaust gas treatment system according to an embodiment of the present disclosure. As shown in Figure 3, a processor 61 of the control device 60A executes a program stored in advance in a storage device such as a ROM 62 or a storage 64, thereby realizing the respective components of a signal input unit 70, an information acquisition unit 71, a correlation information storage unit 72, a charge output adjustment unit 74A, and an output unit 75. The signal input unit 70 receives signals related to the concentration detection values ​​from each of the detection units 201 and 202 via a signal transmission / reception module 65, which is hardware.

[0045] The information acquisition unit 71 acquires the concentration detection values ​​detected by the detection units 201 and 202 based on the signals received by the signal input unit 70 .

[0046] 4 is a diagram illustrating an example of correlation information stored in the control device according to the embodiment of the present disclosure. The correlation information storage unit 72 stores, for example, correlation information relating to the correlation between the soot concentration in the exhaust gas, the ozone concentration in the exhaust gas, and the charging output of the wet electrostatic precipitator 21, as shown in FIG. 4 . This correlation information is acquired in advance by performing a test operation of the wet electrostatic precipitator 21, or the like.

[0047] The charging output adjusting unit 74A adjusts the charging output of the wet electrostatic precipitator 21 based on the soot concentration of the exhaust gas and the ozone concentration of the exhaust gas detected by the detecting units 201 and 202. The charging output adjusting unit 74A adjusts the charging output of the wet electrostatic precipitator 21 based on the soot concentration of the exhaust gas and the ozone concentration of the exhaust gas detected by the detecting units 201 and 202 and the correlation information stored in the correlation information storage unit 72. The charging output adjusting unit 74A adjusts the charging output of the wet electrostatic precipitator 21 so that the soot concentration of the exhaust gas and the ozone concentration of the exhaust gas are equal to or less than preset reference values. For example, if at least one of the soot concentration in the exhaust gas and the ozone concentration in the exhaust gas detected by the detection units 201 and 202 is outside a predetermined concentration range A1, the charge output adjustment unit 74A adjusts the charge output in the wet electrostatic precipitator 21 so that it is within a predetermined charge output range A2.

[0048] The output unit 75 outputs a control signal for changing the charging output in the wet electrostatic precipitator 21 based on the control of the charging output adjustment unit 74A.

[0049] (Procedure of Control Method of Exhaust Gas Treatment System) Figure 5 is a flowchart showing the flow of a control method of an exhaust gas treatment system according to an embodiment of the present disclosure. In this embodiment, a control method S10 of an exhaust gas treatment system described below is realized by the control device 60A sequentially executing processes based on a pre-stored program. As shown in Figure 5, the control method S10 of an exhaust gas treatment system according to this embodiment includes step S11 of acquiring information and step S12 of adjusting the charge output.

[0050] In information acquisition step S11, information including the soot concentration of the exhaust gas containing carbon dioxide and the ozone concentration of the exhaust gas is acquired. To this end, the signal input unit 70 receives, at regular time intervals, the detected value of the soot concentration of the exhaust gas that has passed through the wet electrostatic precipitator 21, detected by the detection unit 201, and the detected value of the ozone concentration of the exhaust gas that has passed through the wet electrostatic precipitator 21, detected by the detection unit 202. The information acquisition unit 71 acquires the soot concentration of the exhaust gas and the ozone concentration of the exhaust gas based on the signals received by the signal input unit 70.

[0051] In step S12 of adjusting the charging output, the charging output adjusting unit 74A adjusts the charging output of the wet electrostatic precipitator 21 based on the soot concentration of the exhaust gas and the ozone concentration of the exhaust gas acquired by the information acquiring unit 71. In this embodiment, the charging output adjusting unit 74A refers to, for example, correlation information stored in the correlation information storage unit 72, and when at least one of the soot concentration of the exhaust gas and the ozone concentration of the exhaust gas detected by the detecting units 201 and 202 is outside a predetermined concentration range A1, the charging output adjusting unit 74A reduces the charging output of the wet electrostatic precipitator 21 to adjust it so that it is within a predetermined charging output range A2.

[0052] The control device 60A repeatedly executes steps S11 and S12 described above at regular time intervals while the exhaust gas treatment system 10A is in operation.

[0053] (Effects) In the exhaust gas treatment system 10A, dust collector 20A, and control method S10 for the exhaust gas treatment system 10A configured as described above, the charging output of the wet electrostatic precipitator 21 is adjusted based on the soot concentration of the exhaust gas containing carbon dioxide and the ozone concentration of the exhaust gas. This prevents excessive charging in the wet electrostatic precipitator 21, thereby suppressing an increase in sulfur trioxide suspended particulate matter and an increase in ozone as a by-product. Because sulfur trioxide suspended particulate matter is very fine, it captures amine vapor in the absorber 12 and is difficult to capture by the packing or demister in the absorber 12. Suppressing the increase in sulfur trioxide suspended particulate matter reduces consumption of amine contained in the absorbent L2, reduces adverse environmental impacts, and suppresses oxidative degradation of the absorbent L2 due to ozone. As a result, adverse effects on the treatment performance of the exhaust gas can be suppressed.

[0054] Furthermore, the control device 60A adjusts the charging output of the wet electrostatic precipitator 21 based on the soot concentration and ozone concentration of the exhaust gas detected by the detection units 201 and 202 and the correlation information stored in the correlation information storage unit 72. This makes it possible to easily control the charging output.

[0055] Furthermore, when at least one of the soot concentration of the exhaust gas and the ozone concentration of the exhaust gas is outside a predetermined concentration range, the control device 60A adjusts the charging output so that it is within the predetermined charging output range. This makes it possible to prevent excessive charging in the wet electrostatic precipitator 21 at an appropriate time. Furthermore, when at least one of the soot concentration of the exhaust gas and the ozone concentration of the exhaust gas is outside the predetermined concentration range A1, the charging output of the wet electrostatic precipitator 21 is reduced, thereby making it possible to reduce power consumption in the wet electrostatic precipitator 21.

[0056] Second Embodiment Next, a second embodiment of the exhaust gas treatment system and the control method for the exhaust gas treatment system according to the present disclosure will be described. In the second embodiment described below, components common to the first embodiment will be denoted by the same reference numerals in the drawings, and description thereof will be omitted. In the second embodiment, the configuration of the control device 60B is different from that of the first embodiment.

[0057] 6 is a diagram showing the configuration of an exhaust gas treatment system according to a second embodiment of the present disclosure. As shown in Fig. 6, the exhaust gas treatment system 10B includes a cooling tower 11, an absorption tower 12, a regeneration tower 13, a recovery unit 15, and a dust collector 20B.

[0058] The dust collecting device 20B in this embodiment includes a wet electrostatic precipitator 21, detection units 201 and 202, and a control device 60B that adjusts the charging output of the wet electrostatic precipitator 21.

[0059] 7 is a functional block diagram of a control device of an exhaust gas treatment system according to a second embodiment of the present disclosure. As shown in FIG. 7, a processor 61 of a control device 60B in this embodiment executes a program stored in advance in a storage device such as a ROM 62 or a storage 64, thereby realizing the components of a signal input unit 70, an information acquisition unit 71, a correlation information storage unit 72, an external information acquisition unit 73, a charge output adjustment unit 74B, and an output unit 75.

[0060] The external information acquisition unit 73 acquires information regarding the amount of exhaust gas emitted from an external gas emission source that emits exhaust gas. The external information acquisition unit 73 acquires, for example, information indicating the load of the gas emission source as information regarding the amount of exhaust gas emitted from a control unit of the gas emission source (not shown). The amount of exhaust gas emitted from the gas emission source changes depending on the load of the gas emission source. Specifically, if the load of the gas emission source increases, the amount of exhaust gas emitted increases. If the load of the gas emission source decreases, the amount of exhaust gas emitted decreases. The external information acquisition unit 73 may acquire, for example, the amount of exhaust gas emitted from the gas emission source as information regarding the amount of exhaust gas emitted.

[0061] The charging output adjusting unit 74B adjusts the charging output of the wet electrostatic precipitator 21 based on the soot concentration of the exhaust gas and the ozone concentration of the exhaust gas detected by the detecting units 201 and 202. The charging output adjusting unit 74B also adjusts the charging output of the wet electrostatic precipitator 21 based on the information about the exhaust gas emission amount acquired by the external information acquiring unit 73. The charging output adjusting unit 74B reduces the charging output of the wet electrostatic precipitator 21 when the load of the gas emission source is less than a predetermined reference value based on the acquired magnitude of the load of the gas emission source. In this way, the charging output adjusting unit 74B essentially reduces the charging output of the wet electrostatic precipitator 21 based on the information about the exhaust gas emission amount when the exhaust gas emission amount is less than the predetermined emission reference value.

[0062] (Procedure of Control Method for Exhaust Gas Treatment System) As shown in FIG. 5, the control method S20 for the exhaust gas treatment system according to this embodiment includes step S21 of acquiring information and step S22 of adjusting the charging output.

[0063] In step S21 of acquiring information, information including the concentration of soot in the exhaust gas containing carbon dioxide and the ozone concentration in the exhaust gas, as well as information regarding the amount of exhaust gas emission, is acquired. To this end, the information acquisition unit 71 acquires the detected concentration values ​​of the soot concentration in the exhaust gas and the ozone concentration in the exhaust gas detected by the detection units 201 and 202. In addition, the external information acquisition unit 73 acquires information regarding the amount of exhaust gas emission from an external gas emission source that emits exhaust gas.

[0064] In step S22 of adjusting the charging output, the charging output adjusting unit 74B adjusts the charging output of the wet electrostatic precipitator 21 based on the soot concentration of the exhaust gas and the ozone concentration of the exhaust gas acquired by the information acquiring unit 71. The charging output adjusting unit 74B also adjusts the charging output of the wet electrostatic precipitator 21 based on information about the exhaust gas emission amount acquired by the external information acquiring unit 73. In this embodiment, for example, the charging output adjusting unit 74B reduces the charging output of the wet electrostatic precipitator 21 when the load of the gas emission source acquired by the external information acquiring unit 73 is less than a preset load reference value.

[0065] The control device 60B repeatedly executes steps S21 and S22 described above at regular time intervals while the exhaust gas treatment system 10B is in operation.

[0066] (Effects) As with the first embodiment, the exhaust gas treatment system 10B, the dust collector 20B, and the control method S20 for the exhaust gas treatment system 10B configured as described above prevent excessive charging in the wet electrostatic precipitator 21. This makes it possible to prevent an increase in suspended particulate matter such as sulfur trioxide and an increase in ozone as a by-product, thereby preventing adverse effects on the treatment performance of the exhaust gas.

[0067] Furthermore, the control device 60B adjusts the charging output of the wet electrostatic precipitator 21 in accordance with the amount of exhaust gas discharged from the external gas emission source, thereby preventing the charging in the wet electrostatic precipitator 21 from becoming excessive relative to the amount of exhaust gas discharged.

[0068] Furthermore, when the load on the gas emission source is low, the control device 60B reduces the charging output of the wet electrostatic precipitator 21. This makes it possible to prevent the charging in the wet electrostatic precipitator 21 from becoming excessive at an appropriate timing.

[0069] Third Embodiment Next, a third embodiment of an exhaust gas treatment system and a control method for an exhaust gas treatment system according to the present disclosure will be described. In the third embodiment described below, components common to the first and second embodiments will be denoted by the same reference numerals in the drawings, and description thereof will be omitted. In the third embodiment, the configuration of a control device 60C differs from that of the first and second embodiments.

[0070] 8 is a diagram showing the configuration of an exhaust gas treatment system according to a third embodiment of the present disclosure. As shown in Fig. 8, the exhaust gas treatment system 10C includes a cooling tower 11, an absorption tower 12, a regeneration tower 13, a recovery unit 15, and a dust collector 20C.

[0071] The dust collecting device 20C in this embodiment includes a wet electrostatic precipitator 21, detection units 201 and 202, emission concentration detection units (detection units) 203 and 204, and a control device 60C that adjusts the charging output of the wet electrostatic precipitator 21.

[0072] The emission concentration detection units 203 and 204 are provided in the exhaust pipe 12e of the absorption tower 12. The emission concentration detection unit 203 detects the concentration of volatile organic compounds (VOCs) in the exhaust gas emitted from the absorption tower 12. The emission concentration detection unit 204 detects the concentration of suspended particulate matter in the exhaust gas emitted from the absorption tower 12.

[0073] (Functional block diagram) As shown in FIG. 7 , the processor 61 of the control device 60C in this embodiment executes a program stored in advance in a storage device such as a ROM 62 or a storage 64, thereby realizing each of the components of the signal input unit 70, the information acquisition unit 71, the correlation information storage unit 72, the external information acquisition unit 73, the charge output adjustment unit 74C, and the output unit 75.

[0074] When adjusting the charging output of the wet electrostatic precipitator 21 based on the soot concentration and ozone concentration of the exhaust gas detected by the detection units 201 and 202, the charging output adjustment unit 74C adjusts the charging output of the wet electrostatic precipitator 21 based on information about the exhaust gas emission amount acquired by the external information acquisition unit 73. Furthermore, in this embodiment, the charging output adjustment unit 74C adjusts the charging output of the wet electrostatic precipitator 21 based on the concentrations of volatile organic compounds and suspended particulate matter in the exhaust gas discharged from the absorption tower 12 detected by the emission concentration detection units 203 and 204. The charging output adjustment unit 74C reduces the charging output of the wet electrostatic precipitator 21 when at least one of the concentrations of volatile organic compounds and suspended particulate matter in the exhaust gas discharged from the absorption tower 12 is higher than a predetermined reference value.

[0075] (Procedure of Control Method for Exhaust Gas Treatment System) As shown in FIG. 5, the control method S30 for the exhaust gas treatment system according to this embodiment includes step S31 of acquiring information and step S32 of adjusting the charging output.

[0076] In step S31 of acquiring information, in addition to information including the dust concentration in the exhaust gas containing carbon dioxide and the ozone concentration in the exhaust gas, and information regarding the exhaust gas emission amount, the information acquiring unit 71 acquires the concentration of volatile organic compounds and the concentration of suspended particulate matter in the exhaust gas emitted from the absorption tower 12. To do this, the information acquiring unit 71 acquires information including the concentration of volatile organic compounds and the concentration of suspended particulate matter detected by the emission concentration detecting units 203 and 204.

[0077] In step S32 of adjusting the charging output, the charging output adjusting unit 74C adjusts the charging output of the wet electrostatic precipitator 21 based on the soot concentration of the exhaust gas and the ozone concentration of the exhaust gas acquired by the information acquiring unit 71. The charging output adjusting unit 74C also adjusts the charging output of the wet electrostatic precipitator 21 based on information about the exhaust gas emission amount acquired by the external information acquiring unit 73. Furthermore, in this embodiment, the charging output adjusting unit 74C reduces the charging output of the wet electrostatic precipitator 21 when at least one of the concentration of volatile organic compounds and the concentration of suspended particulate matter is higher than a preset reference value.

[0078] The control device 60C repeatedly executes steps S31 and S32 described above at regular time intervals while the exhaust gas treatment system 10C is in operation.

[0079] (Effects) As in the first and second embodiments, the exhaust gas treatment system 10C, the dust collector 20C, and the control method S30 for the exhaust gas treatment system 10C configured as described above prevent excessive charging in the wet electrostatic precipitator 21. This makes it possible to prevent an increase in suspended particulate matter such as sulfur trioxide and an increase in ozone as a by-product, thereby preventing adverse effects on the treatment performance of the exhaust gas.

[0080] In addition, the control device 60C can prevent excessive charging in the wet electrostatic precipitator 21 by adjusting the charging output in the wet electrostatic precipitator 21 based on at least one of the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower 12 and the concentration of suspended particulate matter.

[0081] In this embodiment, the dust collecting device 20C includes the detection units 201 and 202 and the external information acquisition unit 73, but is not limited to this. The dust collecting device 20C of this embodiment may not include the detection units 201 and 202 and the external information acquisition unit 73, and may include only the emission concentration detection units 203 and 204.

[0082] Other Embodiments Although the embodiments of the present disclosure have been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment and includes design modifications and the like within the scope of the present disclosure. While the above-described embodiments include a detection unit 201 that detects the particulate matter concentration in the exhaust gas from the gas emission source and a detection unit 202 that detects the ozone concentration in the exhaust gas from the gas emission source, this is not limiting. It is sufficient to include at least one of the detection unit 201 that detects the particulate matter concentration in the exhaust gas from the gas emission source and the detection unit 202 that detects the ozone concentration in the exhaust gas from the gas emission source. Furthermore, while the above-described embodiments include an emission concentration detection unit 203 that detects the concentration of volatile organic compounds in the exhaust gas emitted from the absorption tower 12 and an emission concentration detection unit 204 that detects the concentration of suspended particulate matter in the exhaust gas emitted from the absorption tower 12, this is not limiting. It is sufficient to include at least one of the emission concentration detection unit 203 and the emission concentration detection unit 204.

[0083] Alternatively, a program for implementing all or part of the functions of the control devices 60A-60C may be recorded on a computer-readable recording medium, and the program may be loaded into a computer system and executed to perform processing by each functional unit. The term "computer system" as used herein includes hardware such as an OS and peripheral devices. Furthermore, if a WWW system is used, the term "computer system" also includes the homepage provision environment (or display environment). Furthermore, the term "computer-readable recording medium" refers to portable media such as CDs, DVDs, and USBs, as well as storage devices such as hard disks built into the computer system. Furthermore, if the program is distributed to the control devices 60A-60C via a communication line, the control devices 60A-60C that receive the program may load the program into storage 64 and execute the processing described above. Furthermore, the program may be for implementing only part of the functions described above, or may be capable of implementing the functions described above in combination with a program already stored in the computer system.

[0084] <Additional Notes> The exhaust gas treatment systems 10A to 10C, the dust collecting device 20A, and the control methods S10, S20, and S30 for the exhaust gas treatment systems 10A to 10C described in the respective embodiments can be understood, for example, as follows.

[0085] (1) Each of the exhaust gas treatment systems 10A to 10C according to a first aspect includes a cooling tower 11 that cools exhaust gas containing carbon dioxide by bringing a cooling liquid into contact with the exhaust gas, an absorption tower 12 into which an absorption liquid capable of absorbing carbon dioxide in the exhaust gas is introduced and which causes the absorption liquid to absorb the carbon dioxide in the exhaust gas that has passed through the cooling tower 11, a regeneration tower 13 that heats the absorption liquid that has absorbed the carbon dioxide, separates the carbon dioxide from the absorption liquid, and regenerates the absorption liquid, a wet electrostatic precipitator 21 that collects suspended particulate matter containing sulfur trioxide (SO3) contained in the exhaust gas by charging the suspended particulate matter, and a water-based ... The system includes detection units 201 to 204 that detect at least one of the concentrations of volatile organic compounds in the exhaust gas discharged from the absorption tower 12 and the concentration of suspended particulate matter in the exhaust gas, and a control device 60A that controls the charging output in the wet electrostatic precipitator 21, and the control device 60A includes charging output adjustment units 74A to 74C that adjust the charging output in the wet electrostatic precipitator 21 based on at least one of the soot concentration in the exhaust gas, the ozone concentration in the exhaust gas, the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower 12, and the concentration of suspended particulate matter in the exhaust gas detected by the detection units 201 to 204.

[0086] These exhaust gas treatment systems 10A to 10C adjust the charging output in the wet electrostatic precipitator 21 based on at least one of the soot concentration in the exhaust gas containing carbon dioxide, the ozone concentration in the exhaust gas, the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower 12, and the concentration of the suspended particulate matter in the exhaust gas, thereby preventing excessive charging in the wet electrostatic precipitator 21. This makes it possible to prevent an increase in suspended particulate matter such as sulfur trioxide and an increase in ozone as a by-product, and to prevent adverse effects on the treatment performance of the exhaust gas.

[0087] (2) The exhaust gas treatment systems 10A to 10C according to a second aspect are the exhaust gas treatment systems 10A to 10C of (1), and further include a correlation information storage unit 72 that stores correlation information regarding the correlation between the charge output and at least one of the soot concentration of the exhaust gas and the ozone concentration of the exhaust gas, and the detection units 201 and 202 detect at least one of the soot concentration of the exhaust gas and the ozone concentration of the exhaust gas, and the control device 60A adjusts the charge output of the wet electrostatic precipitator 21 based on at least one of the soot concentration of the exhaust gas and the ozone concentration of the exhaust gas detected by the detection units 201 and 202 and the correlation information stored in the correlation information storage unit 72, so that at least one of the soot concentration of the exhaust gas and the ozone concentration of the exhaust gas is equal to or less than a predetermined reference value.

[0088] This makes it possible to easily control the charging output by adjusting the charging output in the wet electrostatic precipitator 21 based on at least one of the soot concentration in the exhaust gas detected by the detection units 201 and 202 and the ozone concentration in the exhaust gas, and the correlation information stored in the correlation information memory unit 72.

[0089] (3) The exhaust gas treatment systems 10A to 10C according to a third aspect are the exhaust gas treatment systems 10A to 10C of (2), and when at least one of the soot concentration of the exhaust gas and the ozone concentration of the exhaust gas detected by the detection units 201 and 202 is outside a predetermined concentration range, the control device 60A adjusts the charging output of the wet electrostatic precipitator 21 so that it is within a predetermined charging output range.

[0090] As a result, when at least one of the soot concentration in the exhaust gas and the ozone concentration in the exhaust gas is outside a predetermined concentration range, the charging output is adjusted to be within the predetermined charging output range, thereby preventing excessive charging in the wet electrostatic precipitator 21 at the appropriate time.

[0091] (4) The exhaust gas treatment system 10B according to a fourth aspect is any one of the exhaust gas treatment systems 10B of (1) to (3), wherein the control device 60B further includes an external information acquisition unit 73 that acquires information about the exhaust gas emission amount from an external gas emission source that emits the exhaust gas, and the charging output adjustment unit 74B adjusts the charging output in the wet electrostatic precipitator 21 based on the information about the exhaust gas emission amount acquired by the external information acquisition unit 73.

[0092] This allows the charging output of the wet electrostatic precipitator 21 to be adjusted in accordance with information regarding the amount of exhaust gas emitted from an external gas emission source, thereby preventing the charging in the wet electrostatic precipitator 21 from becoming excessive relative to the amount of exhaust gas emitted.

[0093] (5) The fifth aspect of the exhaust gas treatment system 10B is the exhaust gas treatment system 10B of (4), in which the control device 60B reduces the charging output of the wet electrostatic precipitator 21 when the exhaust gas emission amount is less than a predetermined emission standard value based on information regarding the exhaust gas emission amount acquired by the external information acquisition unit 73.

[0094] As a result, when the amount of exhaust gas emitted from the gas emission source is less than a predetermined emission standard value, the charging output of the wet electrostatic precipitator 21 is reduced, thereby preventing excessive charging in the wet electrostatic precipitator 21 at an appropriate time.

[0095] (6) The sixth aspect of the exhaust gas treatment system 10C is any one of the exhaust gas treatment systems 10C of (1) to (5), in which the detection units 203, 204 detect at least one of the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower 12 and the concentration of suspended particulate matter in the exhaust gas, and the charge output adjustment unit 74C adjusts the charge output in the wet electrostatic precipitator 21 based on at least one of the concentration of the volatile organic compounds and the concentration of suspended particulate matter detected by the detection units 203, 204.

[0096] This allows the charging output to be adjusted based on at least one of the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower 12 and the concentration of suspended particulate matter, thereby preventing excessive charging in the wet electrostatic precipitator 21.

[0097] (7) A dust collector 20A according to a seventh aspect is a dust collector 20A provided in an exhaust gas treatment system 10A to 10C including a cooling tower 11 that cools exhaust gas containing carbon dioxide by bringing a cooling liquid into contact with the exhaust gas, an absorption tower 12 into which an absorption liquid capable of absorbing carbon dioxide in the exhaust gas is introduced and which causes the absorption liquid to absorb the carbon dioxide in the exhaust gas that has passed through the cooling tower 11, and a regeneration tower 13 that heats the absorption liquid that has absorbed the carbon dioxide, separates the carbon dioxide from the absorption liquid, and regenerates the absorption liquid. The dust collector 20A further includes a wet electrostatic precipitator 21 that collects suspended particulate matter containing sulfur trioxide contained in the exhaust gas by charging the suspended particulate matter, and a dust concentration of the exhaust gas, a dust concentration of the exhaust gas, and a regeneration tower 13 that regenerates the absorption liquid. The wet electrostatic precipitator 21 includes detection units 201 to 204 that detect at least one of the ozone concentration of the exhaust gas, the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower 12, and the concentration of suspended particulate matter in the exhaust gas, and a control unit 60A that controls the charging output in the wet electrostatic precipitator 21, and the control unit 60A includes charge output adjustment units 74A to 74C that adjust the charging output in the wet electrostatic precipitator 21 based on at least one of the soot concentration of the exhaust gas, the ozone concentration of the exhaust gas, the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower 12, and the concentration of suspended particulate matter in the exhaust gas detected by the detection units 201 to 204.

[0098] This dust collector 20A adjusts the charging output in the wet electrostatic precipitator 21 based on at least one of the soot concentration in the exhaust gas containing carbon dioxide, the ozone concentration in the exhaust gas, the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower 12, and the concentration of suspended particulate matter in the exhaust gas, thereby preventing excessive charging in the wet electrostatic precipitator 21. This makes it possible to prevent an increase in suspended particulate matter such as sulfur trioxide and an increase in ozone as a by-product, and to prevent adverse effects on the treatment performance of the exhaust gas in the exhaust gas treatment systems 10A to 10C equipped with the dust collector 20A.

[0099] (8) The control methods S10, S20, and S30 of the exhaust gas treatment systems 10A to 10C according to an eighth aspect are the control methods S10, S20, and S30 of any one of the exhaust gas treatment systems 10A to 10C of (1) to (7), and include steps S11, S21, and S31 of acquiring information including at least one of the following: a dust concentration in the exhaust gas containing carbon dioxide, an ozone concentration in the exhaust gas, a concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower 12, and a concentration of suspended particulate matter in the exhaust gas; and steps S12, S22, and S32 of adjusting the charging output of the wet electrostatic precipitator 21 based on at least one of the dust concentration in the exhaust gas, the ozone concentration in the exhaust gas, the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower 12, and the concentration of suspended particulate matter in the exhaust gas.

[0100] The control methods S10, S20, and S30 of the exhaust gas treatment systems 10A to 10C adjust the charging output in the wet electrostatic precipitator 21 based on at least one of the soot concentration in the exhaust gas, the ozone concentration in the exhaust gas, the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower 12, and the concentration of suspended particulate matter in the exhaust gas, thereby preventing excessive charging in the wet electrostatic precipitator 21. This makes it possible to prevent an increase in suspended particulate matter such as sulfur trioxide and an increase in ozone as a by-product, and to prevent adverse effects on the treatment performance of the exhaust gas.

[0101] (9) The control methods S10, S20, and S30 of the exhaust gas treatment systems 10A to 10C according to a ninth aspect are the control methods S10, S20, and S30 of the exhaust gas treatment systems 10A to 10C according to (8), and in steps S12, S22, and S32 of adjusting the charging output, the charging output of the wet electrostatic precipitator 21 is adjusted based on at least one of the detected soot concentration of the exhaust gas and the ozone concentration of the exhaust gas and pre-stored correlation information relating to the correlation between at least one of the soot concentration of the exhaust gas and the ozone concentration of the exhaust gas and the charging output, so that at least one of the soot concentration of the exhaust gas and the ozone concentration of the exhaust gas is equal to or less than a preset reference value.

[0102] This makes it possible to easily control the charging output by adjusting the charging output in the wet electrostatic precipitator 21 based on at least one of the detected soot concentration in the exhaust gas and the ozone concentration in the exhaust gas, and pre-stored correlation information.

[0103] (10) The control methods S20 and S30 of the exhaust gas treatment systems 10B and 10C according to the tenth aspect are the control methods S20 and S30 of the exhaust gas treatment systems 10B and 10C of (9), and in the steps S22 and S32 of adjusting the charging output, if at least one of the detected soot concentration of the exhaust gas and the ozone concentration of the exhaust gas is outside a predetermined concentration range, the charging output of the wet electrostatic precipitator 21 is adjusted to be within a predetermined charging output range.

[0104] As a result, when at least one of the soot concentration in the exhaust gas and the ozone concentration in the exhaust gas is outside a predetermined concentration range, the charging output is adjusted to be within the predetermined charging output range, thereby preventing excessive charging in the wet electrostatic precipitator 21 at the appropriate time.

[0105] (11) The control methods S20, S30 of the exhaust gas treatment systems 10B, 10C according to the eleventh aspect are the control methods S20, S30 of any one of the exhaust gas treatment systems 10B, 10C of (8) to (10), in which in the steps S21, S31 of acquiring the information, information relating to the exhaust gas emission amount from an external gas emission source that emits the exhaust gas is further acquired, and in the steps S22, S32 of adjusting the charging output, the charging output in the wet electrostatic precipitator 21 is adjusted based on the information relating to the exhaust gas emission amount.

[0106] This allows the charging output of the wet electrostatic precipitator 21 to be adjusted in accordance with the amount of exhaust gas emitted from an external gas emission source, thereby preventing the charging in the wet electrostatic precipitator 21 from becoming excessive relative to the amount of exhaust gas emitted.

[0107] (12) The control methods S20 and S30 of the exhaust gas treatment systems 10B and 10C according to the twelfth aspect are the control methods S20 and S30 of the exhaust gas treatment systems 10B and 10C of (11), and in the steps S22 and S32 of adjusting the charging output, based on information about the exhaust gas emission amount, if the exhaust gas emission amount is less than a predetermined emission standard value, the charging output of the wet electrostatic precipitator 21 is reduced.

[0108] As a result, when the amount of exhaust gas emitted from the gas emission source is less than a predetermined emission standard value, the charging output of the wet electrostatic precipitator 21 is reduced, thereby preventing excessive charging in the wet electrostatic precipitator 21 at an appropriate time.

[0109] (12) A control method S30 for an exhaust gas treatment system 10C according to a twelfth aspect is a control method S30 for an exhaust gas treatment system 10C according to any one of (8) to (11), in which, in the step S31 of acquiring the information, information including at least one of the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower 12 and the concentration of suspended particulate matter in the exhaust gas is acquired, and in the step S32 of adjusting the charging output, the charging output in the wet electrostatic precipitator 21 is adjusted based on at least one of the concentration of the volatile organic compounds and the concentration of suspended particulate matter.

[0110] This allows the charging output in the wet electrostatic precipitator 21 to be adjusted based on at least one of the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower 12 and the concentration of suspended particulate matter, thereby preventing excessive charging in the wet electrostatic precipitator 21.

[0111] According to each embodiment of the present disclosure, it is possible to suppress adverse effects on the exhaust gas treatment performance.

[0112] DESCRIPTION OF SYMBOLS 10A to 10C... Exhaust gas treatment system 11... Cooling tower 11a... Tower body 11b... Nozzle 12... Absorption tower 12a... Tower body 12b, 12c... Nozzle 12d... Washing water receiver 12e... Exhaust pipe 13... Regeneration tower 13a... Tower body 13b, 13c... Nozzle 15... Recovery section 20A to 20C... Dust collector 21... Wet electrostatic precipitator 31... Cooling liquid supply pump 32A... First circulation pump 32B... Second circulation pump 33... Absorbent liquid circulation pump 41... First heat exchanger 43... Second heat exchanger 45... Heat exchanger 46... Third heat exchanger 48... Reboiler 49... Condenser 60A to 60C... Control device 61... Processor 62... ROM 63... RAM 64... Storage 65... Signal transmission / reception module 70... Signal input section 71... Information acquisition unit 72... Correlation information storage unit 73... External information acquisition unit 74A to 74C... Charge output adjustment unit 75... Output unit 81... Steam supply pipe 82A to 82C... Cooling water supply pipe 101... Gas introduction line 102... Cooling liquid supply line 103... Exhaust gas discharge line 105... Cleaning water circulation line 106... Circulation line 106A... Absorbing liquid supply line 106B... Absorbing liquid discharge line 107... Refrigerant line 108... Absorbing liquid heating line 109... Gaseous carbon dioxide discharge line 110... Refrigeration line 111... Carbon dioxide discharge pipe 112... Refrigeration pump 201, 202... Detection unit 203, 204... Discharge concentration detection unit (detection unit) L1... Cooling liquid L2... Absorbing liquid

Claims

1. A system comprising: a cooling tower that cools exhaust gas containing carbon dioxide by bringing a cooling liquid into contact with the exhaust gas; an absorption tower into which an absorption liquid capable of absorbing carbon dioxide in the exhaust gas is introduced, and which causes the absorption liquid to absorb the carbon dioxide in the exhaust gas that has passed through the cooling tower; a regeneration tower that heats the absorption liquid that has absorbed carbon dioxide, separates the carbon dioxide from the absorption liquid, and regenerates the absorption liquid; a wet electrostatic precipitator that collects suspended particulate matter including sulfur trioxide (SO3) contained in the exhaust gas by charging the suspended particulate matter; a detection unit that detects at least one of the soot concentration in the exhaust gas, the ozone concentration in the exhaust gas, the concentration of volatile organic compounds (VOCs) in the exhaust gas discharged from the absorption tower, and the concentration of the suspended particulate matter in the exhaust gas; and a control device that controls the charging output of the wet electrostatic precipitator, wherein the control device an electric charge output adjusting unit that adjusts an electric charge output of the wet electrostatic precipitator based on at least one of the concentration of soot in the exhaust gas detected by the detecting unit, the concentration of ozone in the exhaust gas, the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower, and the concentration of suspended particulate matter in the exhaust gas.

2. An exhaust gas treatment system according to claim 1, further comprising a correlation information storage unit that stores correlation information regarding the correlation between at least one of the soot concentration of the exhaust gas and the ozone concentration of the exhaust gas and the charging output, wherein the detection unit detects at least one of the soot concentration of the exhaust gas and the ozone concentration of the exhaust gas, and the control device adjusts the charging output of the wet electrostatic precipitator based on at least one of the soot concentration of the exhaust gas and the ozone concentration of the exhaust gas detected by the detection unit and the correlation information stored in the correlation information storage unit, so that at least one of the soot concentration of the exhaust gas and the ozone concentration of the exhaust gas is equal to or less than a predetermined standard value.

3. The exhaust gas treatment system according to claim 2, wherein the control device adjusts the charging output of the wet electrostatic precipitator so that it is within a predetermined charging output range when at least one of the soot concentration of the exhaust gas detected by the detection unit and the ozone concentration of the exhaust gas is outside a predetermined concentration range.

4. An exhaust gas treatment system as described in claim 1 or 2, wherein the control device further comprises an external information acquisition unit that acquires information regarding the exhaust gas emission amount from an external gas emission source that emits the exhaust gas, and the charge output adjustment unit adjusts the charge output in the wet electrostatic precipitator based on the information regarding the exhaust gas emission amount acquired by the external information acquisition unit.

5. The exhaust gas treatment system according to claim 4, wherein the control device reduces the charging output of the wet electrostatic precipitator when the exhaust gas emission amount is less than a preset emission standard value based on information regarding the exhaust gas emission amount acquired by the external information acquisition unit.

6. An exhaust gas treatment system as described in claim 1 or 2, wherein the detection unit detects at least one of the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower and the concentration of suspended particulate matter in the exhaust gas, and the charge output adjustment unit adjusts the charge output in the wet electrostatic precipitator based on at least one of the concentration of the volatile organic compounds and the concentration of suspended particulate matter detected by the detection unit.

7. A dust collector provided in an exhaust gas treatment system including a cooling tower that cools exhaust gas containing carbon dioxide by bringing a cooling liquid into contact with the exhaust gas, an absorption tower into which an absorption liquid capable of absorbing carbon dioxide in the exhaust gas is introduced and which causes the absorption liquid to absorb the carbon dioxide in the exhaust gas that has passed through the cooling tower, and a regeneration tower that heats the absorption liquid that has absorbed the carbon dioxide, separates the carbon dioxide from the absorption liquid, and regenerates the absorption liquid, the dust collector comprising: a wet electrostatic precipitator that collects suspended particulate matter including sulfur trioxide contained in the exhaust gas by charging the suspended particulate matter; a detection unit that detects at least one of the soot concentration in the exhaust gas, the ozone concentration in the exhaust gas, the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower, and the concentration of the suspended particulate matter in the exhaust gas; and a control device that controls the charging output of the wet electrostatic precipitator, wherein the control device a charge output adjustment unit that adjusts a charge output in the wet electrostatic precipitator based on at least one of the soot concentration in the exhaust gas detected by the detection unit, the ozone concentration in the exhaust gas, the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower, and the concentration of suspended particulate matter in the exhaust gas.

8. A control method for an exhaust gas treatment system according to claim 1 or 2, comprising the steps of: acquiring information including at least one of the soot concentration in the exhaust gas containing carbon dioxide, the ozone concentration in the exhaust gas, the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower, and the concentration of suspended particulate matter in the exhaust gas; and adjusting the charging output in the wet electrostatic precipitator based on at least one of the soot concentration in the exhaust gas, the ozone concentration in the exhaust gas, the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower, and the concentration of suspended particulate matter in the exhaust gas.

9. A control method for an exhaust gas treatment system as described in claim 8, wherein in the step of adjusting the charging output, the charging output in the wet electrostatic precipitator is adjusted based on at least one of the detected soot concentration in the exhaust gas and the ozone concentration in the exhaust gas and pre-stored correlation information regarding the correlation between the charging output and at least one of the soot concentration in the exhaust gas and the ozone concentration in the exhaust gas, so that at least one of the soot concentration in the exhaust gas and the ozone concentration in the exhaust gas is below a preset reference value.

10. A control method for an exhaust gas treatment system as described in claim 9, wherein in the step of adjusting the charging output, if at least one of the detected soot concentration in the exhaust gas and the ozone concentration in the exhaust gas is outside a predetermined concentration range, the charging output of the wet electrostatic precipitator is adjusted so that it is within a predetermined charging output range.

11. A control method for an exhaust gas treatment system as described in claim 8, wherein the step of acquiring information further acquires information regarding the exhaust gas emission amount from an external gas emission source that emits the exhaust gas, and the step of adjusting the charging output adjusts the charging output in the wet electrostatic precipitator based on the information regarding the exhaust gas emission amount.

12. A control method for an exhaust gas treatment system as described in claim 11, wherein in the step of adjusting the charging output, if the exhaust gas emission amount is less than a predetermined emission standard value based on information about the exhaust gas emission amount, the charging output of the wet electrostatic precipitator is reduced.

13. A control method for an exhaust gas treatment system as described in claim 8 or 9, wherein in the step of acquiring information, information including at least one of the concentration of volatile organic compounds in the exhaust gas discharged from the absorption tower and the concentration of suspended particulate matter in the exhaust gas is acquired, and in the step of adjusting the charging output, the charging output in the wet electrostatic precipitator is adjusted based on at least one of the concentration of the volatile organic compounds and the concentration of suspended particulate matter.

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