Scrubbing tower device and gas treatment method in scrubbing tower device

Abstract

A washing tower device is provided with: a housing; a gas supply unit capable of supplying a gas containing ammonia into the housing; a liquid dispersing part capable of dispersing the absorption liquid supplied from the outside of the housing from the upper part in the housing; a gas release part capable of releasing gas from the upper part of the housing; an absorption liquid discharge part capable of discharging the absorption liquid from the lower part of the housing; and a gas circulation line capable of circulating gas from the upper part of the housing to the lower part of the housing.

Description

Technical Field

[0001] The invention relates to a washing tower device and a gas processing method in the washing tower device.

[0002] This application claims priority based on patent application No. 2022-146688 filed in Japan on September 15, 2022, and the contents are incorporated herein by reference. Background Art

[0003] There is a possibility of ammonia leakage in a room containing a device or equipment for handling ammonia. In addition, in the above-mentioned device or equipment for handling ammonia, a purge with an inert gas that does not react with ammonia is sometimes performed to discharge the remaining ammonia together with the inert gas. Ammonia may act on human mucous membranes and cause obstruction, so the gas containing ammonia generated by the above-mentioned leakage or purge should not be released directly into the atmosphere.

[0004] Patent document 1 describes a so-called scrubber device in which harmful substances are absorbed by an absorbent by spraying an absorbent into a gas containing harmful substances. More specifically, Patent document 1 discloses a ship exhaust gas purification system, which is a SOx scrubber for removing sulfur oxides (SOx) and includes a spray tower and a spray device. The spray tower includes an exhaust gas inlet and an exhaust gas outlet. The exhaust gas inlet introduces exhaust gas into the internal space of the spray tower. The exhaust gas outlet extracts purified exhaust gas from the internal space of the spray tower. The general flow of exhaust gas passes through the internal space of the spray tower from the exhaust gas inlet to the exhaust gas outlet. The spray device provides a scrubber liquid flow in the internal space of the spray tower that is opposite to the general flow of exhaust gas. The scrubber liquid flow absorbs sulfur oxides by contacting the exhaust gas in the internal space of the spray tower, thereby reducing the amount of sulfur oxides in the exhaust gas.

[0005] Previous technical literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent No. 7015794 Summary of the invention

[0008] Technical issues to be solved by the invention

[0009] However, when removing ammonia from the air by a scrubber device such as that described in Patent Document 1, for example, if the ammonia concentration unexpectedly increases or a temporary failure occurs in the spray of the scrubber device, the ammonia may not be fully removed. Furthermore, if, for example, an unexpected increase in ammonia concentration can be dealt with, the amount of absorbent supplied to the scrubber device and the amount of ammonia absorbent that has absorbed ammonia will increase. Furthermore, there is the following problem: in order to be able to deal with the temporary failure of the sprayer, measures such as increasing the capacity of the shell of the scrubber device are required.

[0010] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a scrubber apparatus and a gas treatment method in the scrubber apparatus that can suppress the release of ammonia to the outside while suppressing an increase in the flow rate of the absorbent and an increase in the capacity of the shell.

[0011] Means for solving technical problems

[0012] In order to solve the above-mentioned problems, the scrubbing tower device according to the present invention comprises a shell, a gas supply part, a liquid dispersion part, a gas release part, an absorbent discharge part and a gas circulation line. The gas supply part can supply a gas containing ammonia into the shell. The liquid dispersion part can disperse the absorbent supplied from the outside of the shell from the upper part inside the shell. The gas release part can release gas from the upper part of the shell. The absorbent discharge part can discharge the absorbent from the lower part of the shell. The gas circulation line circulates the gas from the upper part of the shell to the lower part of the shell.

[0013] The gas treatment method in the scrubber device involved in the present invention is the gas treatment method in the scrubber device as described above. The gas treatment method in the scrubber device includes: a process of circulating gas to the lower part of the shell, a process of detecting ammonia concentration, and a process of releasing gas from the upper part of the shell. In the process of circulating gas in the lower part of the shell, while supplying gas containing ammonia into the shell, water supplied from the outside of the shell is scattered from the upper part of the shell, and gas is circulated from the upper part of the shell to the lower part of the shell. In the process of detecting the ammonia concentration, the ammonia concentration of the gas released from the upper part of the shell is detected. In the process of releasing gas from the upper part of the shell, when the detected ammonia concentration is lower than a preset gas concentration reference value, the circulation of gas from the upper part of the shell to the lower part of the shell is stopped, and gas is released from the upper part of the shell.

[0014] Effects of the Invention

[0015] According to the scrubber apparatus and the gas treatment method in the scrubber apparatus of the present invention, it is possible to suppress the release of ammonia to the outside while suppressing an increase in the flow rate of the absorbent and an increase in the capacity of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a figure which shows the structure of the washing tower apparatus which concerns on the 1st Embodiment of this invention.

[0017] Figure 2 This is a flowchart showing the steps of a gas treatment method in a scrubber apparatus according to an embodiment of the present invention.

[0018] Figure 3This is a diagram showing a step of circulating gas in the lower part of a shell in the gas treatment method in the scrubber apparatus according to the embodiment of the present invention.

[0019] Figure 4 This is a diagram showing a step of releasing gas from the upper portion of a casing in the gas treatment method in the scrubber apparatus according to the embodiment of the present invention.

[0020] Figure 5 This is a diagram showing a state where the absorbent is discharged from the lower portion of the casing in the scrubbing tower device according to the embodiment of the present invention.

[0021] Figure 6 It is a figure which shows the structure of the washing tower apparatus which concerns on the 2nd Embodiment of this invention.

[0022] Figure 7 It is a diagram showing the hardware configuration of a control device for a scrubbing tower apparatus according to a second embodiment of the present invention.

[0023] Figure 8 This is a functional block diagram of a control device according to a second embodiment of the present invention. DETAILED DESCRIPTION

[0024] Below, reference Figures 1 to 8 , a scrubbing tower device and a gas treatment method in a scrubbing tower device according to an embodiment of the present invention are described.

[0025] <First embodiment>

[0026] (Overall structure of the scrubber unit)

[0027] like Figure 1 As shown, the scrubber device 10 of this embodiment performs a process of removing ammonia from a gas G containing ammonia. Such a scrubber device 10 is provided in an ammonia facility that processes ammonia. As ammonia facilities, there can be exemplified facilities having a tank for storing ammonia, facilities having a device for using ammonia as fuel, facilities having a circulation system for circulating ammonia, and the like. Furthermore, the ammonia facility can be provided on land, or can be provided on a floating body floating on the sea including various ships. In the case of a ship, the ship type is not limited to a specific ship type. As ship types of ships, there can be exemplified liquefied gas tankers, ferries, RORO (roll-on / roll-off) ships, car tankers, passenger ships, and the like. Furthermore, the floating body is not limited to ships, and can also be an FSU (Floating Storage Unit: floating storage device), an FSRU (Floating Storage and Regasification Unit: floating storage and regasification device), and the like.

[0028] The scrubber apparatus 10 removes ammonia from gas containing ammonia leaking from an ammonia facility that processes ammonia or gas containing ammonia exhausted together with an inert gas by purging with an inert gas that does not react with ammonia.

[0029] like Figure 1 As shown, the scrubbing tower device 10 includes at least a shell 11 , a gas supply unit 15 , an absorbent supply unit 25 , a liquid dispersion unit 20 , a gas release unit 40 , a gas circulation line 80 , an absorbent discharge unit 50 , and an absorbent circulation line 90 .

[0030] The housing 11 is formed in a cylindrical shape extending in the up-down direction Dv. The absorbing liquid L can be stored in the lower portion of the internal space 11s (inside the housing) of the housing 11.

[0031] The gas supply unit 15 can supply a gas G containing ammonia (hereinafter simply referred to as gas G) into the housing 11 . The gas supply unit 15 includes a gas supply line 16 and an on-off valve 17 .

[0032] One end of the gas supply line 16 is connected to a gas generating source (not shown) that generates the gas G to be processed. The other end 16b of the gas supply line 16 is connected to the housing 11. The other end 16b opens above the liquid level of the absorbent L in the internal space 11s of the housing 11.

[0033] The on-off valve 17 opens and closes the flow path in the gas supply line 16. The supply of the gas G into the shell 11 through the gas supply line 16 is intermittent by opening and closing the on-off valve 17. In the first embodiment, the gas supply line 16 supplies the gas G sent together with the inert gas to the internal space 11s of the shell 11 when the fuel supply system of the combustion device using ammonia as fuel is purged with the inert gas.

[0034] In addition, the gas supply unit 15 includes an auxiliary gas supply line 18. The auxiliary gas supply line 18 supplies a low-concentration or small amount of gas G containing ammonia gas from a system containing ammonia gas, such as an exhaust pipe of a waste water tank, into the housing 11. The auxiliary gas supply line 18 is connected to the housing 11. The auxiliary gas supply line 18 is connected to the housing 11 in a manner of opening at a position above the liquid level of the absorbent L in the internal space 11s of the housing 11. The case where a check valve 19 is provided in the auxiliary gas supply line 18 to prevent the backflow of the gas G from the housing 11 side is illustrated.

[0035] The gas G supplied from the gas supply line 16 of the gas supply unit 15 to the internal space 11 s of the housing 11 and the gas G supplied from the auxiliary gas supply line 18 to the internal space 11 s of the housing 11 rise from the lower part to the upper part in the internal space 11 s of the housing 11 .

[0036] The absorption liquid supply unit 25 supplies the absorption liquid L from the outside of the housing 11 to the liquid diffusion unit 20 . The absorption liquid supply unit 25 includes an absorption liquid supply line 26 , a fifth valve 27 , and a pump 28 .

[0037] One end of the absorption liquid supply line 26 is connected to a supply source (not shown) of the absorption liquid L. When clean water is used as the absorption liquid L, one end of the absorption liquid supply line 26 is connected to a clean water tank (not shown) as the supply source. Furthermore, when the scrubber apparatus 10 is installed on a floating body and the surrounding seawater on which the floating body floats is used as the absorption liquid, one end of the absorption liquid supply line 26 is arranged to face the sea.

[0038] The other end 26b of the absorption liquid supply line 26 is connected to the liquid dispersing nozzle 21 disposed at the upper portion of the internal space 11s in the housing 11. A pump 28 is provided in the middle of the absorption liquid supply line 26, and the absorption liquid L is supplied to the liquid dispersing nozzle 21 by the pump 28.

[0039] An absorbent cooling unit 29 capable of cooling the absorbent L diffused from the upper portion of the housing 11 by the diffuser 20 is provided in the middle of the absorbent supply line 26 illustrated in the first embodiment. The absorbent cooling unit 29 cools the absorbent L in the absorbent supply line 26 by heat exchange with an external heat medium. By cooling the absorbent L by the absorbent cooling unit 29, the absorption efficiency of ammonia by the absorbent L is improved.

[0040] The liquid spreading unit 20 is provided so as to be able to spread the absorption liquid L supplied from the absorption liquid supply unit 25 from the upper part of the housing 11. The liquid spreading unit 20 includes a liquid spreading nozzle 21. The liquid spreading nozzle 21 spreads the absorption liquid L into the internal space 11s of the housing 11 by spraying, dripping, spraying, etc. The dispersed absorption liquid L moves downward in the internal space 11s of the housing 11 by its own weight. In the process of moving in the internal space 11s of the housing 11, the absorption liquid L contacts the gas G rising from the lower part to the upper part in the internal space 11s of the housing 11, and absorbs the ammonia component contained in the gas G.

[0041] The gas release unit 40 can release the gas G in the internal space 11 s from the upper portion of the housing 11 . The gas release unit 40 includes a gas release line 41 and a first valve 45 .

[0042] One end 41a of the gas release line 41 illustrated in the first embodiment is connected to the top of the housing 11. The other end (not shown) of the gas release line 41 may be connected to a chimney, a vent column, etc. The gas release portion 40 releases gas G into the atmosphere, for example.

[0043] The first valve 45 opens and closes the flow path of the gas G from the housing 11 to the gas release portion 40. The first valve 45 opens and closes the flow path of the gas release line 41. By opening and closing the first valve 45, the release of the gas G from the housing 11 through the gas release line 41 is intermittent.

[0044] The gas circulation line 80 circulates the gas G from the upper part of the housing 11 to the lower part of the housing 11. The gas circulation line 80 of the first embodiment circulates the gas G from the upper part of the housing 11 through the outside of the housing 11 to the lower part of the housing 11. Alternatively, the gas circulation line 80 may circulate the gas G from the upper part of the housing 11 through the inside of the housing 11 to the lower part of the housing 11.

[0045] The gas circulation line 80 includes a gas circulation connection pipe 81, a second valve 85, a fan 84, and a check valve 86. One end 81a of the gas circulation connection pipe 81 of the first embodiment is connected to the gas release line 41 between one end 41a of the gas release line 41 and the first valve 45. Furthermore, the other end 81b of the gas circulation connection pipe 81 is connected to the gas supply line 16 between the other end 16b of the gas supply line 16 and the on-off valve 17.

[0046] The gas circulation line 80 illustrated in the first embodiment shares a portion thereof with the gas release line 41 and the gas supply line 16. Specifically, in the gas circulation line 80, a portion of a section 82 between one end 41a of the gas release line 41 and a portion connected to one end 81a of the gas circulation connection pipe 81 is shared with the gas release line 41. In addition, in the gas circulation line 80, a portion of a section 83 between the other end 16b of the gas supply line 16 and a portion connected to the other end 81b of the gas circulation connection pipe 81 is shared with the gas supply line 16. That is, the gas circulation line 80 includes a portion of a section 82 of the gas release line 41, the gas circulation connection pipe 81, and a portion of a section 83 of the gas supply line 16. The gas circulation line 80 allows the gas G released from the upper part of the housing 11 to circulate to the lower part of the housing 11 through the portion of the section 82, the gas circulation connection pipe 81, and the portion of the section 83.

[0047] The second valve 85 opens and closes the flow path of the gas G from the housing 11 to the gas circulation pipeline 80. In the first embodiment, the second valve 85 is provided in the middle of the gas circulation connecting pipe 81. By opening and closing the second valve 85, the flow path of the gas G in the gas circulation connecting pipe 81 is opened and closed. By opening and closing the second valve 85, the flow of the gas G from the housing 11 to the gas circulation connecting pipe 81 of the gas circulation pipeline 80 is intermittent.

[0048] The fan 84 sucks and delivers the gas G in the internal space 11s of the housing 11 from the upper part of the housing 11. The fan 84 of the first embodiment is provided in a portion of the interval 82, more specifically, between the portion where the ammonia concentration meter 100 described later is connected to the one end 81a of the gas circulation connecting pipe 81. In addition, the fan 84 may also be provided between the one end 81a of the gas circulation connecting pipe 81 and the second valve 85.

[0049] The check valve 86 is provided in the middle of the gas circulation connection pipe 81. Specifically, the check valve 86 is provided between the second valve 85 and the other end 81b of the gas circulation connection pipe 81. The check valve 86 allows the flow of the gas G from the gas circulation connection pipe 81 to the gas supply line 16, while preventing the backflow of the gas G from the part of the section 83 side to the inside of the housing 11.

[0050] The absorption liquid discharge part 50 can discharge the absorption liquid L from the lower part of the housing 11 to the outside of the housing 11. The absorption liquid discharge part 50 includes an absorption liquid discharge line 51 and a third valve 55.

[0051] One end 51a of the absorption liquid discharge conduit 51 is connected to the bottom of the housing 11. The other end (not shown) of the absorption liquid discharge conduit 51 is connected to a waste liquid tank (not shown) or the like.

[0052] The third valve 55 is provided in the middle of the absorption liquid discharge line 51. The third valve 55 opens and closes the flow path of the absorption liquid L discharged from the housing 11 to the absorption liquid discharge part 50. By opening and closing the third valve 55, the absorption liquid L from the housing 11 through the absorption liquid discharge line 51 is discharged intermittently.

[0053] The absorption liquid circulation pipeline 90 can circulate the absorption liquid L from the lower part of the shell 11 to the upper part of the shell 11 via the liquid diffusion part 20. The absorption liquid circulation pipeline 90 has an absorption liquid circulation connecting pipe 91 and a fourth valve 95. The absorption liquid circulation connecting pipe 91 forms a flow path for the absorption liquid L to flow. One end 91a of the absorption liquid circulation connecting pipe 91 is connected to the lower part of the shell 11. The one end 91a is connected to the shell 11 at a position lower than the liquid level of the absorption liquid L stored in the internal space 11s of the shell 11. The other end 91b of the absorption liquid circulation connecting pipe 91 is connected to the absorption liquid supply pipeline 26 between the fifth valve 27 and the pump 28 of the absorption liquid supply pipeline 26.

[0054] A portion of the absorption liquid circulation conduit 90 illustrated in the first embodiment is shared with the absorption liquid supply conduit 26. Specifically, in the absorption liquid circulation conduit 90, a portion of a section 92 between a position where the other end 91b of the absorption liquid circulation connection pipe 91 is connected in the absorption liquid supply conduit 26 and the other end 26b of the absorption liquid supply conduit 26 is shared with the absorption liquid supply conduit 26. That is, the absorption liquid circulation conduit 90 of the first embodiment includes the absorption liquid circulation connection pipe 91 and a portion of the section 92 of the absorption liquid supply conduit 26. The absorption liquid circulation conduit 90 supplies the absorption liquid L extracted from the lower part of the housing 11 to the liquid dispersing nozzle 21 of the liquid dispersing unit 20 through the absorption liquid circulation connection pipe 91 and the portion of the section 92.

[0055] The fourth valve 95 opens and closes the flow path of the absorbent L from the housing 11 to the absorbent circulation pipe 90. The fourth valve 95 of the first embodiment is provided in the middle of the absorbent circulation connecting pipe 91. The flow path of the absorbent L in the absorbent circulation connecting pipe 91 is opened and closed by opening and closing the fourth valve 95. The extraction of the absorbent L from the lower part of the housing 11 to the absorbent circulation connecting pipe 91 of the absorbent circulation pipe 90 is intermittent by opening and closing the fourth valve 95.

[0056] The scrubbing tower apparatus 10 illustrated in the first embodiment further includes an ammonia gas concentration meter 100 and an ammonia absorbing liquid concentration meter 200 .

[0057] The ammonia concentration meter 100 detects the ammonia concentration of the gas G released from the housing 11 to the gas release unit 40. The ammonia concentration meter 100 of the first embodiment is provided between one end 41a of the gas release line 41 and one end 81a of the gas release line 41 connected to the gas circulation connection pipe 81.

[0058] The ammonia absorbing liquid concentration meter 200 detects the ammonia concentration of the absorbing liquid L in the casing 11. In the first embodiment, the ammonia absorbing liquid concentration meter 200 detects the ammonia concentration of the absorbing liquid L stored in the lower portion of the internal space 11s of the casing 11.

[0059] The first valve 45, the second valve 85, the third valve 55, the fourth valve 95, and the fifth valve 27 are each an automatic valve such as a piston valve, and can control the opening and closing operation according to a signal received from the outside such as a control panel (not shown). The valve drive unit 45v of the first valve 45 and the valve drive unit 85v of the second valve 85 perform their respective opening and closing operations according to the detection value of the ammonia concentration detected by the ammonia concentration meter 100. The valve drive unit 55v of the third valve 55, the valve drive unit 95v of the fourth valve 95, and the valve drive unit 27v of the fifth valve 27 perform their respective opening and closing operations according to the detection value of the ammonia concentration of the absorbent L detected by the ammonia absorption liquid concentration meter 200. In the first embodiment, the opening and closing operations of the valve drive units 45v, 85v, 55v, 95v, and 27v are performed by an operator who has confirmed the detection values ​​of the ammonia concentration meter 100 and the ammonia absorption liquid concentration meter 200 through remote operation or the like.

[0060] (Steps of a gas treatment method in a scrubber apparatus)

[0061] Figure 2 This is a flowchart showing the steps of a gas treatment method in a scrubber apparatus according to an embodiment of the present invention.

[0062] like Figure 2 As shown, the gas treatment method S10 in the washing tower device 10 includes a step S11 for circulating the gas G, a step S12 for detecting the ammonia concentration of the gas G, a step S13 for determining whether the concentration is lower than a gas concentration reference value, and a step S14 for releasing the gas G from the upper part of the shell 11.

[0063] Figure 3 This is a diagram showing a process of circulating gas in the lower part of a casing in a gas treatment method in a scrubber apparatus according to an embodiment of the present invention.

[0064] In the scrubber device 10, in order to remove ammonia contained in the gas G, a step S11 of circulating the gas G is performed after startup. Figure 3As shown, in the step S11 of circulating the gas G, the on-off valve 17 is opened, the first valve 45 is closed, and the second valve 85 is opened. The on-off valve 17 is opened, and the gas G containing ammonia is introduced into the internal space 11s of the shell 11 through the gas supply line 16. In the internal space 11s of the shell 11, the introduced gas G absorbs ammonia by the absorption liquid L dispersed from the dispersion nozzle 21 of the dispersion part 20. The gas G from which ammonia is removed in the internal space 11s of the shell 11 circulates to the lower part of the shell 11 through the gas circulation line 80, and contacts the absorption liquid L dispersed from the dispersion part 20 again. As a result, the ammonia concentration of the gas G is reduced. In this step, since the first valve 45 is closed, the gas G is not discharged to the outside during the treatment. Therefore, when the scrubber apparatus 10 is mounted on a floating body, etc., it is possible to suppress the gas G from accidentally leaking due to the swing.

[0065] In the step S12 of detecting the ammonia concentration of the gas G, the ammonia concentration of the gas G released from the upper portion of the housing 11 is detected by the ammonia concentration meter 100 .

[0066] In the step S13 of determining whether the ammonia concentration is lower than the gas concentration reference value, it is determined whether the ammonia concentration of the gas G detected by the ammonia concentration meter 100 is lower than the gas concentration reference value. This determination can be performed by an operator visually, etc., but when the ammonia concentration of the gas G detected by the ammonia concentration meter 100 is lower than the gas concentration reference value, an alarm signal or the like may be output by a monitoring device of the ammonia concentration meter 100 or the like.

[0067] In step S13, when it is determined that the ammonia concentration of the gas G is not lower than the gas concentration reference value (step S13, No), the process returns to step S11. On the other hand, in step S13, when it is determined that the ammonia concentration of the gas G is lower than the gas concentration reference value (step S13, Yes), the process proceeds to step S14.

[0068] Figure 4 This is a diagram showing a step of releasing gas from the upper portion of a casing in the gas treatment method in the scrubber apparatus according to the embodiment of the present invention.

[0069] like Figure 4 As shown, in the step S14 of releasing the gas G from the upper part of the housing 11, the first valve 45 is opened and the second valve 85 is closed. In this way, the circulation of the gas G from the upper part of the housing 11 to the lower part of the housing 11 is stopped by closing the second valve 85. Then, by opening the first valve 45, the gas G from which the ammonia component is removed in the internal space 11s of the housing 11 is released from the housing 11 to the gas release part 40. In this way, only the gas G from which the ammonia component is sufficiently removed is released to the gas release part 40.

[0070] As described above, when the treatment of removing ammonia contained in the gas G is performed, in the scrubbing tower device 10, basically, the absorbent L is circulated from the lower part of the shell 11 to the upper part of the shell 11 through the absorbent circulation line 90 via the liquid diffusion part 20. Figure 3 , Figure 4 As shown, the third valve 55 and the fifth valve 27 are closed and the fourth valve 95 is opened.

[0071] In the scrubbing tower device 10, the ammonia concentration of the absorbent L detected by the ammonia absorbent concentration meter 200 is monitored, and it is determined whether the detected ammonia concentration of the absorbent L is equal to or greater than a preset absorbent concentration reference value. This determination may be performed by an operator visually or the like, but when the ammonia concentration of the absorbent L detected by the ammonia absorbent concentration meter 200 becomes equal to or greater than the absorbent concentration reference value, an alarm signal or the like may be outputted in a monitoring device or the like of the ammonia absorbent concentration meter 200.

[0072] Figure 5 This is a diagram showing a state where the absorbent is discharged from the lower portion of the casing in the scrubbing tower device according to the embodiment of the present invention.

[0073] like Figure 5 As shown, when the ammonia concentration of the absorbent L detected by the ammonia absorbent concentration meter 200 becomes equal to or higher than the absorbent concentration reference value, the fourth valve 95 is closed and the third valve 55 and the fifth valve 27 are opened. In this way, the absorbent L that has absorbed ammonia through contact with the gas G containing ammonia is discharged to the absorbent discharge section 50 by opening the third valve 55. Furthermore, by opening the fifth valve 27, new absorbent L is supplied from the outside of the shell 11 to the liquid diffusion section 20 through the absorbent supply section 25. In this way, the ammonia concentration of the absorbent L in the internal space 11s of the shell 11 can be reduced. In addition, in Figure 5 In FIG. 1 , the case where the third valve 55 and the fifth valve 27 are opened when the gas G is not circulated is exemplified, but the case where the third valve 55 and the fifth valve 27 are opened when the gas G is circulated may also be used.

[0074] (Effect)

[0075] In the first embodiment, the gas G containing ammonia is supplied to the internal space 11s of the housing 11 by the gas supply unit 15. The liquid dispersion unit 20 disperses the absorbent L supplied from the outside of the housing 11 from the upper part of the internal space 11s of the housing 11. As a result, the absorbent L contacts the gas G containing ammonia, and the ammonia contained in the gas G is absorbed by the absorbent L. The absorbent L absorbing the ammonia falls to the lower part of the housing 11 due to its own weight. The gas G from which the ammonia is removed is released from the upper part of the housing 11 by the gas release unit 40. The absorbent discharge unit 50 discharges the absorbent L absorbing the ammonia from the lower part of the housing 11 to the outside of the housing 11. The gas circulation line 80 circulates the gas G from the upper part of the housing 11 to the lower part of the housing 11. That is, the gas circulation line 80 circulates the gas G after ammonia is absorbed by the absorbent L dispersed from the liquid dispersion unit 20 from the upper part of the housing 11 to the lower part of the housing 11. The gas G circulated to the lower part of the housing 11 contacts the absorption liquid L dispersed from the dispersion unit 20 again in the internal space 11s of the housing 11. Thus, even if ammonia remains in the gas G absorbed by the absorption liquid L, the gas G circulates to the lower part of the housing 11, and the absorption of ammonia by the absorption liquid L is performed multiple times. Therefore, even if ammonia cannot be sufficiently removed by only one contact with the absorption liquid L, ammonia can be sufficiently removed from the gas G containing ammonia. And, therefore, there is no need to increase the amount of the absorption liquid L or the capacity of the housing 11. Therefore, the release of ammonia to the outside can be suppressed while suppressing an increase in the flow rate of the absorption liquid L and an increase in the capacity of the housing 11.

[0076] Furthermore, in the first embodiment, the release of the gas G from the housing 11 to the gas release portion 40 can be intermittent by opening and closing the first valve 45. Furthermore, the circulation of the gas G from the housing 11 to the gas circulation line 80 can be intermittent by opening and closing the second valve 85. The ammonia concentration meter 100 detects the ammonia concentration of the gas G flowing from the housing 11 to the gas release portion 40. Thus, the first valve 45 and the second valve 85 can be opened and closed according to the ammonia concentration of the gas G detected by the ammonia concentration meter 100. For example, when the ammonia concentration of the detected gas G is lower than a preset gas concentration reference value, the first valve 45 is opened and the second valve 85 is closed. Thus, the gas G from which ammonia is removed in the internal space 11s of the housing 11 is released from the housing 11 to the gas release portion 40. Furthermore, when the ammonia concentration of the detected gas G is higher than a preset gas concentration reference value, the first valve 45 is closed and the second valve 85 is opened. Then, the gas G from which ammonia has been removed in the internal space 11s of the housing 11 circulates to the lower part of the housing 11 through the gas circulation line 80 and is brought into contact with the absorbing liquid L diffused from the liquid diffusion unit 20 again. Thus, the ammonia concentration of the gas G is reduced.

[0077] Furthermore, in the first embodiment, the absorbent L can be circulated from the lower part of the housing 11 to the upper part of the housing 11 through the liquid diffusion part 20 through the absorbent circulation line 90. The third valve 55 can intermittently discharge the absorbent L from the housing 11 to the absorbent discharge part 50. The fourth valve 95 can intermittently circulate the absorbent L from the housing 11 through the absorbent circulation line 90. The ammonia absorbent concentration meter 200 detects the ammonia concentration of the absorbent L in the internal space 11s of the housing 11. Thus, the third valve 55 and the fourth valve 95 can be opened and closed according to the ammonia concentration of the absorbent L in the internal space 11s of the housing 11, and it is possible to switch whether to discharge the absorbent L to the absorbent discharge part 50 or to circulate the absorbent L to the upper part of the housing 11 through the absorbent circulation line 90.

[0078] Furthermore, in the first embodiment, when the ammonia concentration of the absorbent L detected by the ammonia absorbent concentration meter 200 becomes equal to or higher than the preset absorbent concentration reference value, the fifth valve 27 is opened. Then, the absorbent L is supplied from the outside of the housing 11 to the liquid diffusion unit 20 through the absorbent supply unit 25. Thus, the ammonia concentration of the absorbent L can be reduced.

[0079] Furthermore, in the first embodiment, the absorbent L dispersed from the upper portion of the internal space 11s of the housing 11 by the liquid dispersion unit 20 can be cooled by the absorbent cooling unit 29. In particular, the absorbent L circulating through the absorbent circulation line 90 increases in temperature due to the reaction heat during the absorption of ammonia. By cooling the absorbent L whose temperature has increased, the ammonia absorption efficiency of the absorbent L can be improved.

[0080] Furthermore, in the first embodiment, the fan 84 can deliver the gas G from the upper portion of the housing 11. In particular, when the gas G is circulated from the upper portion of the housing 11 to the lower portion of the housing 11 through the gas circulation line 80, the gas G can be circulated efficiently.

[0081] <Second embodiment>

[0082] Next, a scrubber apparatus and a gas treatment method in a scrubber apparatus according to a second embodiment of the present invention are described. In the second embodiment described below, only the structure of the control device 60 is different from that of the first embodiment, so the same parts as the first embodiment are marked with the same symbols for description, and repeated description is omitted.

[0083] Figure 6 It is a figure which shows the structure of the washing tower apparatus which concerns on the 2nd Embodiment of this invention.

[0084] like Figure 6As shown, the scrubbing tower apparatus 10B of this embodiment includes at least a casing 11 , a gas supply unit 15 , a liquid dispersion unit 20 , a gas release unit 40 , a gas circulation line 80 , an absorbent discharge unit 50 , an absorbent circulation line 90 , and a control device 60 .

[0085] (Hardware structure diagram)

[0086] Figure 7 It is a diagram showing the hardware configuration of a control device for a scrubbing tower apparatus according to a second embodiment of the present invention.

[0087] like Figure 7 As shown, the control device 60 is a computer including a CPU 61 (Central Processing Unit), a ROM 62 (Read Only Memory), a RAM 63 (Random Access Memory), a storage device 64 such as a HDD (Hard Disk Drive), and a signal transceiver module 65 .

[0088] (Functional Block Diagram)

[0089] Figure 8 This is a functional block diagram of a scrubber apparatus according to a second embodiment of the present invention.

[0090] like Figure 8 As shown, the CPU 61 of the control device 60 implements the functional structures of the signal receiving unit 71, the gas flow path control unit 72, the absorption liquid flow path control unit 73, and the command signal output unit 74 by executing the program pre-stored in the RAM 63 or the storage device 64.

[0091] The signal receiving unit 71 receives detection signals from the ammonia gas concentration meter 100 and the ammonia absorbing liquid concentration meter 200 via the signal transceiver module 65 which is hardware.

[0092] The gas flow path control unit 72 outputs a command signal for controlling the opening and closing of the first valve 45 and the second valve 85 according to the ammonia concentration of the gas G detected by the ammonia concentration meter 100. The command signal output unit 74 outputs the command signal to the valve drive unit 45v of the first valve 45 and the valve drive unit 85v of the second valve 85.

[0093] When the ammonia concentration of the gas G detected by the ammonia concentration meter 100 becomes equal to or higher than a preset gas concentration reference value, the gas flow path control unit 72 outputs a command signal to close the first valve 45 and open the second valve 85. Then, the gas G from which ammonia has been removed in the internal space 11s of the housing 11 circulates to the lower part of the housing 11 through the gas circulation line 80, and is brought into contact with the absorption liquid L diffused from the liquid diffusion unit 20 again. As a result, the ammonia concentration of the gas G is reduced.

[0094] When the ammonia concentration of the gas G detected by the ammonia concentration meter 100 is lower than a preset gas concentration reference value, the gas flow path control unit 72 outputs a command signal to open the first valve 45 and close the second valve 85. As a result, the gas G from which ammonia is removed in the internal space 11s of the housing 11 is released from the housing 11 to the gas release unit 40.

[0095] The absorption liquid flow path control unit 73 outputs a command signal for controlling the opening and closing of the third valve 55 and the fourth valve 95 according to the ammonia concentration of the absorption liquid L detected by the ammonia absorption liquid concentration meter 200. The output command signal is output from the command signal output unit 74 to the valve drive unit 55v of the third valve 55, the valve drive unit 95v of the fourth valve 95, and the valve drive unit 27v of the fifth valve 27.

[0096] In the absorption liquid flow path control unit 73, when the ammonia concentration of the absorption liquid L detected by the ammonia absorption liquid concentration meter 200 is lower than the preset absorption liquid concentration reference value, a command signal is output to close the third valve 55 and open the fourth valve 95. As a result, the absorption liquid L circulates to the upper part of the housing 11 through the absorption liquid circulation line 90, and is diffused from the diffusion unit 20 again to contact the gas G containing ammonia.

[0097] In the absorption liquid flow path control unit 73, when the ammonia concentration of the absorption liquid L detected by the ammonia absorption liquid concentration meter 200 becomes equal to or higher than the preset absorption liquid concentration reference value, a command signal is output to open the third valve 55 and close the fourth valve 95. When the ammonia concentration of the absorption liquid L becomes equal to or higher than the preset absorption liquid concentration reference value, the absorption liquid L is discharged from the housing 11 to the absorption liquid discharge unit 50 because the absorption efficiency of the absorption liquid L for ammonia is reduced.

[0098] Furthermore, in the absorption liquid flow path control unit 73, when the ammonia concentration of the absorption liquid L detected by the ammonia absorption liquid concentration meter 200 becomes equal to or higher than the preset absorption liquid concentration reference value, a command signal is output to open the fifth valve 27. Then, the absorption liquid L is supplied from the outside of the housing 11 to the liquid diffusion unit 20 through the absorption liquid supply unit 25. Thus, the ammonia concentration of the absorption liquid L is reduced.

[0099] (Steps of a gas treatment method in a scrubber apparatus)

[0100] Figure 2 This is a flowchart showing the steps of a gas treatment method in a scrubber apparatus according to an embodiment of the present invention.

[0101] In the scrubber apparatus 10B, the control device 60 executes the same steps as the gas treatment method in the scrubber apparatus shown in the first embodiment. Figure 2 As shown, the gas treatment method S20 in the washing tower device 10B includes a step S21 of circulating the gas G, a step S22 of detecting the ammonia concentration of the gas G, a step S23 of determining whether the concentration is lower than a gas concentration reference value, and a step S24 of releasing the gas G from the upper part of the shell 11.

[0102] After the process of removing ammonia contained in the gas G is started, in the step S21 of circulating the gas G, the control device 60 opens the on-off valve 17, closes the first valve 45, and opens the second valve 85. The gas G containing ammonia is introduced into the internal space 11s of the housing 11 through the gas supply line 16 by opening the on-off valve 17. In the internal space 11s of the housing 11, ammonia is absorbed by the absorption liquid L dispersed from the dispersion nozzle 21 of the dispersion unit 20 in the introduced gas G. The gas G from which ammonia is removed in the internal space 11s of the housing 11 circulates to the lower part of the housing 11 through the gas circulation line 80, and contacts the absorption liquid L dispersed from the dispersion unit 20 again. As a result, the ammonia concentration of the gas G is reduced.

[0103] In the step S22 of detecting the ammonia concentration of the gas G, the ammonia concentration of the gas G released from the upper portion of the housing 11 is detected by the ammonia concentration meter 100 .

[0104] In the step S23 of determining whether the ammonia concentration is lower than the gas concentration reference value, the control device 60 determines whether the ammonia concentration of the gas G detected by the ammonia concentration meter 100 is lower than the gas concentration reference value.

[0105] In step S23, when it is determined that the ammonia concentration of the gas G is not lower than the gas concentration reference value (step S23, No), the process returns to step S22. On the other hand, in step S23, when it is determined that the ammonia concentration of the gas G is lower than the gas concentration reference value (step S23, Yes), the process proceeds to step S24.

[0106] In the step S24 of releasing the gas G from the upper part of the housing 11, the control device 60 opens the first valve 45 and closes the second valve 85. Thus, by closing the second valve 85, the circulation of the gas G from the upper part of the housing 11 to the lower part of the housing 11 is stopped. By opening the first valve 45, the gas G from which the ammonia component is removed in the internal space 11s of the housing 11 is released from the housing 11 to the gas release part 40. In this way, only the gas G from which the ammonia component is sufficiently removed is released to the gas release part 40.

[0107] Furthermore, as described above, the control device 60 closes the third valve 55 and the fifth valve 27 and opens the fourth valve 95 when performing the process of removing ammonia contained in the gas G. As a result, the absorbent L circulates from the lower part of the housing 11 to the upper part of the housing 11 through the absorbent circulation line 90 and the liquid diffusion unit 20.

[0108] The control device 60 monitors the ammonia concentration of the absorbing liquid L detected by the ammonia absorbing liquid concentration meter 200, and determines whether the detected ammonia concentration of the absorbing liquid L is equal to or higher than a preset absorbing liquid concentration reference value.

[0109] When the ammonia concentration of the absorbent L detected by the ammonia absorbent concentration meter 200 becomes equal to or higher than the absorbent concentration reference value, the control device 60 closes the fourth valve 95 and opens the third valve 55 and the fifth valve 27. By opening the third valve 55, the absorbent L that has absorbed ammonia by contact with the gas G containing ammonia is discharged to the absorbent discharge unit 50. Furthermore, by opening the fifth valve 27, new absorbent L is supplied from the outside of the housing 11 to the liquid diffusion unit 20 through the absorbent supply unit 25. Thus, the ammonia concentration of the absorbent L in the internal space 11s of the housing 11 can be reduced.

[0110] (Effect)

[0111] According to the second embodiment, similarly to the first embodiment, it is possible to suppress the release of ammonia to the outside while suppressing an increase in the flow rate of the absorbing liquid L and an increase in the capacity of the housing 11 .

[0112] Furthermore, in the second embodiment, the gas flow path control unit 72 controls the opening and closing of the first valve 45 and the second valve 85 according to the ammonia concentration of the gas G detected by the ammonia concentration meter 100. Thus, it is possible to automatically determine whether to release the gas G to the gas release unit 40 or to circulate the gas G in the gas circulation line 80 according to the ammonia concentration of the gas G after the ammonia removal process by the absorbent L.

[0113] Furthermore, in the second embodiment, when the ammonia concentration of the gas G is lower than a preset gas concentration reference value, the gas G can be released from the housing 11 to the gas release portion 40 by the control of the gas flow path control portion 72. Furthermore, when the detected ammonia concentration of the gas G is higher than a preset gas concentration reference value, the gas G can be circulated in the lower portion of the housing 11 through the gas circulation line 80 and can be brought into contact with the absorption liquid L dispersed from the liquid dispersion portion 20 again.

[0114] Furthermore, in the second embodiment, the absorption liquid flow path control unit 73 controls the opening and closing of the third valve 55 and the fourth valve 95 according to the ammonia concentration of the absorption liquid L detected by the ammonia absorption liquid concentration meter 200. Thus, it is possible to automatically determine whether to discharge the absorption liquid L that has absorbed ammonia through contact with the gas G containing ammonia to the absorption liquid discharge unit 50 or to circulate the absorption liquid L to the upper part of the shell 11 through the absorption liquid circulation line 90.

[0115] Furthermore, in the second embodiment, when the ammonia concentration of the absorbent L is lower than a preset absorbent concentration reference value, the absorbent L can be circulated to the upper part of the housing 11 through the absorbent circulation line 90 by the control of the absorbent flow path control unit 73, and can be brought into contact again with the gas G containing ammonia diffused from the liquid diffuser 20. Furthermore, when the detected ammonia concentration of the absorbent L is higher than the preset absorbent concentration reference value, the ammonia absorption efficiency by the absorbent L is reduced, and therefore the absorbent L can be discharged from the housing 11 to the absorbent discharge unit 50.

[0116] Furthermore, in the above-mentioned second embodiment, in the absorption liquid flow path control unit 73, when the ammonia concentration of the absorption liquid L detected by the ammonia absorption liquid concentration meter 200 becomes equal to or higher than the preset absorption liquid concentration reference value, the fifth valve 27 is opened. Then, the absorption liquid L is supplied from the outside of the housing 11 to the liquid diffusion unit 20 through the absorption liquid supply unit 25. Thus, the ammonia concentration of the absorption liquid L can be reduced.

[0117] (Other Implementations)

[0118] Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to the embodiments and design changes within the scope not departing from the gist of the present invention are also included.

[0119] In the above-described embodiment, the steps of the gas processing method S10 and S20 in the scrubber apparatus 10 are shown, but the order and the specific contents of each step can be changed as appropriate.

[0120] Furthermore, in the above-mentioned embodiment, the structure in which the surrounding seawater of the floating body is directly sucked in and used as the absorption liquid is described as an example, but the present invention is not limited to this structure. For example, seawater stored in a seawater storage tank (not shown) provided in a ballast tank or the like in the ship may be used, or the seawater of the surrounding seawater of the floating body and the seawater of the seawater storage tank (not shown) provided in the ship may be used by switching appropriately.

[0121] Furthermore, in the above-described embodiment, when the ammonia concentration of the absorbent L detected by the ammonia absorbent concentration meter 200 becomes equal to or higher than the preset absorbent concentration reference value, a new absorbent L having a low ammonia concentration is supplied from the outside to the diffused liquid section 20. However, the present invention is not limited to the configuration of the above-described embodiment. In addition to the configuration of the above-described embodiment, for example, when the ammonia concentration of the gas G detected by the ammonia concentration meter 100 exceeds the preset upper limit of the ammonia concentration, a new absorbent L having a low ammonia concentration may be supplied from the outside to the diffused liquid section 20. Thus, even when the ammonia concentration of the circulating absorbent L rises suddenly, the ammonia concentration of the circulating absorbent L can be reduced before it exceeds the absorbent concentration reference value.

[0122] <Note>

[0123] The scrubber apparatuses 10 and 10B and the gas processing methods S10 and S20 in the scrubber apparatuses 10 and 10B described in the respective embodiments can be understood, for example, as follows.

[0124] (1) A scrubbing tower apparatus 10, 10B according to a first embodiment includes: a shell 11; a gas supply unit 15 capable of supplying a gas G containing ammonia into the shell 11; a liquid dispersion unit 20 capable of dispersing an absorbent L supplied from the outside of the shell 11 from the upper portion of the shell 11; a gas release unit 40 capable of releasing the gas G from the upper portion of the shell 11; an absorbent discharge unit 50 capable of discharging the absorbent L from the lower portion of the shell 11; and a gas circulation line 80 capable of circulating the gas G from the upper portion of the shell 11 to the lower portion of the shell 11.

[0125] Examples of the absorbing liquid L include clean water and seawater.

[0126] The scrubbing tower apparatus 10, 10B supplies gas G containing ammonia into the shell 11 through the gas supply unit 15. The liquid dispersion unit 20 disperses the absorbent L supplied from the outside of the shell 11 from the upper part of the shell 11. As a result, the absorbent L contacts the gas G containing ammonia, and the ammonia contained in the gas G is absorbed by the absorbent L. The absorbent L that has absorbed the ammonia falls to the lower part of the shell 11 due to its own weight. The gas G from which the ammonia is removed is released from the upper part of the shell 11 through the gas release unit 40. The absorbent discharge unit 50 discharges the absorbent L that has absorbed the ammonia from the lower part of the shell 11 to the outside of the shell 11. The gas circulation line 80 circulates the gas G from the upper part of the shell 11 to the lower part of the shell 11. That is, the gas circulation line 80 circulates the gas G after ammonia is absorbed by the absorbent L dispersed from the liquid dispersion unit 20 from the upper part of the shell 11 to the lower part of the shell 11. The gas G circulated to the lower part of the housing 11 contacts the absorption liquid L dispersed from the dispersion unit 20 again in the housing 11. Thus, even if ammonia remains in the gas G absorbed by the absorption liquid L, the gas G circulates to the lower part of the housing 11, and the absorption of ammonia by the absorption liquid L is performed multiple times. Therefore, even if ammonia cannot be sufficiently removed by only one contact with the absorption liquid L, ammonia can be sufficiently removed from the gas G containing ammonia. And, therefore, there is no need to increase the amount of the absorption liquid L or the capacity of the housing 11. Therefore, it is possible to suppress the release of ammonia to the outside while suppressing an increase in the flow rate of the absorption liquid L and an increase in the capacity of the housing 11.

[0127] (2) The washing tower device 10, 10B involved in the second embodiment is the washing tower device 10, 10B of (1), which further includes: a first valve 45 for opening and closing the flow path of the gas G from the shell 11 to the gas release section 40; a second valve 85 for opening and closing the flow path of the gas G from the shell 11 to the gas circulation pipeline 80; and an ammonia concentration meter 100 for detecting the ammonia concentration of the gas G flowing from the shell 11 to the gas release section 40.

[0128] Thus, the release of the gas G from the housing 11 to the gas release section 40 can be intermittent by opening and closing the first valve 45. Furthermore, the circulation of the gas G from the housing 11 to the gas circulation line 80 can be intermittent by opening and closing the second valve 85. The ammonia concentration meter 100 detects the ammonia concentration of the gas G flowing from the housing 11 to the gas release section 40. Thus, the first valve 45 and the second valve 85 can be opened and closed according to the ammonia concentration of the gas G detected by the ammonia concentration meter 100. For example, when the ammonia concentration of the detected gas G is lower than a preset gas concentration reference value, the first valve 45 is opened and the second valve 85 is closed. Thus, the gas G from which ammonia is removed in the housing 11 is released from the housing 11 to the gas release section 40. Furthermore, when the ammonia concentration of the detected gas G is higher than a preset gas concentration reference value, the first valve 45 is closed and the second valve 85 is opened. Then, the gas G from which ammonia has been removed in the housing 11 circulates to the lower part of the housing 11 through the gas circulation line 80 and contacts the absorbent L diffused from the liquid diffusion unit 20 again. Thus, the ammonia concentration of the gas G decreases.

[0129] (3) A scrubber apparatus 10B according to a third aspect is the scrubber apparatus 10B according to (2), further comprising a gas flow control unit 72 for controlling opening and closing of the first valve 45 and the second valve 85 according to the ammonia concentration of the gas G detected by the ammonia concentration meter 100 .

[0130] Therefore, the gas flow path control unit 72 controls the opening and closing of the first valve 45 and the second valve 85 according to the ammonia concentration of the gas G detected by the ammonia concentration meter 100, thereby being able to automatically determine whether to release the gas G into the gas release unit 40 or to circulate and execute the gas G in the gas circulation pipeline 80 according to the ammonia concentration of the gas G after the ammonia removal treatment based on the absorption liquid L.

[0131] (4) The washing tower device 10B involved in the fourth embodiment is the washing tower device 10B of (3), wherein, in the gas flow path control unit 72, when the ammonia concentration of the gas G detected by the ammonia concentration meter 100 is lower than a predetermined gas concentration reference value, the first valve 45 is opened and the second valve 85 is closed; when the ammonia concentration of the gas G detected by the ammonia concentration meter 100 becomes higher than a predetermined gas concentration reference value, the first valve 45 is closed and the second valve 85 is opened.

[0132] Thus, when the ammonia concentration of the gas G is lower than a preset gas concentration reference value, the gas G can be released from the housing 11 to the gas release portion 40. Furthermore, when the detected ammonia concentration of the gas G is higher than a preset gas concentration reference value, the gas G can be circulated in the lower portion of the housing 11 through the gas circulation line 80 and brought into contact with the absorption liquid L dispersed from the liquid dispersion portion 20 again.

[0133] (5) The scrubbing tower device 10, 10B according to the fifth aspect is any one of the scrubbing tower devices 10, 10B according to (1) to (4), further comprising: an absorption liquid circulation line 90 capable of circulating the absorption liquid L from the lower part of the shell 11 to the upper part of the shell 11 via the liquid diffusion section 20; a third valve 55 for opening and closing the flow path of the absorption liquid L discharged from the shell 11 to the absorption liquid discharge section 50; a fourth valve 95 for opening and closing the flow path of the absorption liquid L from the shell 11 to the absorption liquid circulation line 90; and an ammonia absorption liquid concentration meter 200 for detecting the ammonia concentration of the absorption liquid L in the shell 11.

[0134] Thus, the absorption liquid circulation line 90 can circulate the absorption liquid L from the lower part of the shell 11 to the upper part of the shell 11 via the liquid diffusion part 20. The third valve 55 can intermittently discharge the absorption liquid L from the shell 11 to the absorption liquid discharge part 50. The fourth valve 95 can intermittently circulate the absorption liquid L from the shell 11 through the absorption liquid circulation line 90. The ammonia absorption liquid concentration meter 200 detects the ammonia concentration of the absorption liquid L in the shell 11. Thus, the third valve 55 and the fourth valve 95 can be opened and closed according to the ammonia concentration of the absorption liquid L in the shell 11, and it is possible to switch whether to discharge the absorption liquid L to the absorption liquid discharge part 50 or to circulate the absorption liquid L to the upper part of the shell 11 through the absorption liquid circulation line 90.

[0135] (6) A washing tower device 10B according to a sixth aspect is the washing tower device 10B according to (5), further comprising: an absorbent flow path control unit 73 for controlling the opening and closing of the third valve 55 and the fourth valve 95 according to the ammonia concentration of the absorbent L detected by the ammonia absorbent concentration meter 200.

[0136] In this structure, the absorption liquid flow path control unit 73 controls the opening and closing of the third valve 55 and the fourth valve 95 according to the ammonia concentration of the absorption liquid L detected by the ammonia absorption liquid concentration meter 200. Thus, it is possible to automatically switch whether the absorption liquid L that has absorbed ammonia through contact with the gas G containing ammonia is discharged to the absorption liquid discharge unit 50 or the absorption liquid L is circulated to the upper part of the shell 11 through the absorption liquid circulation pipeline 90.

[0137] (7) The washing tower device 10B involved in the seventh embodiment is the washing tower device 10B of (6), wherein, in the absorption liquid flow path control unit 73, when the ammonia concentration of the absorption liquid L detected by the ammonia absorption liquid concentration meter 200 is lower than a predetermined absorption liquid concentration reference value, the third valve 55 is closed and the fourth valve 95 is opened; when the ammonia concentration of the absorption liquid L detected by the ammonia absorption liquid concentration meter 200 becomes higher than a predetermined absorption liquid concentration reference value, the third valve 55 is opened and the fourth valve 95 is closed.

[0138] Thus, when the ammonia concentration of the absorbent L is lower than the preset absorbent concentration reference value, the absorbent L can be circulated to the upper part of the housing 11 through the absorbent circulation line 90, and can be diffused again from the diffuser 20 to contact the ammonia-containing gas G. Furthermore, when the detected ammonia concentration of the absorbent L is equal to or higher than the preset absorbent concentration reference value, the ammonia absorption efficiency by the absorbent L is reduced, and therefore the absorbent L can be discharged from the housing 11 to the absorbent discharger 50.

[0139] (8) A washing tower device 10B according to an eighth aspect is the washing tower device 10B according to (7), further comprising: an absorption liquid supply unit 25 for supplying the absorption liquid L from the outside of the housing 11 to the liquid diffusion unit 20; and a fifth valve 27 for opening and closing a flow path of the absorption liquid L from the absorption liquid supply unit 25 to the liquid diffusion unit 20, wherein the absorption liquid flow path control unit 73 opens the fifth valve 27 when the ammonia concentration of the absorption liquid L detected by the ammonia absorption liquid concentration meter 200 becomes equal to or higher than a preset absorption liquid concentration reference value.

[0140] Thus, in the absorption liquid flow path control unit 73, when the ammonia concentration of the absorption liquid L detected by the ammonia absorption liquid concentration meter 200 becomes equal to or higher than the preset absorption liquid concentration reference value, the fifth valve 27 is opened. Then, the absorption liquid L is supplied from the outside of the housing 11 to the liquid diffusion unit 20 through the absorption liquid supply unit 25. Thus, the ammonia concentration of the absorption liquid L can be reduced.

[0141] (9) A washing tower apparatus 10 or 10B according to a ninth aspect is any one of the washing tower apparatuses 10 or 10B described in (1) to (8), further comprising an absorbent cooling unit 29 capable of cooling the absorbent L dispersed from the upper portion of the casing 11 by the dispersion unit 20 .

[0142] Thus, the absorbent cooling unit 29 can cool the absorbent L dispersed from the upper part of the housing 11 by the dispersion unit 20. In particular, the absorbent L circulating through the absorbent circulation line 90 increases in temperature due to the reaction heat during the absorption of ammonia. By cooling the absorbent L whose temperature has increased, the ammonia absorption efficiency of the absorbent L can be improved.

[0143] (10) A scrubbing tower apparatus 10 or 10B according to a tenth aspect is any one of the scrubbing tower apparatus 10 or 10B described in (1) to (9), further comprising a fan 84 configured to send the gas G from an upper portion of the casing 11 .

[0144] Thus, the gas G can be sent out from the upper part of the housing 11 by the fan 84. In particular, when the gas G is circulated from the upper part of the housing 11 to the lower part of the housing 11 by the gas circulation line 80, the gas G can be circulated efficiently.

[0145] (11) The gas treatment method S10, S20 in the scrubber apparatus 10, 10B according to the eleventh embodiment is the gas treatment method S10, S20 in the scrubber apparatus 10, 10B according to any one of (1) to (10), wherein the gas treatment method S10, S20 comprises: a step S11, S21 of supplying a gas G containing ammonia into the shell 11 while scattering water supplied from the outside of the shell 11 from the upper part of the shell 11 and circulating the gas G from the upper part of the shell 11 to the lower part of the shell 11; a step S12, S22 of detecting the ammonia concentration of the gas G released from the upper part of the shell 11; and a step S14, S24 of stopping the circulation of the gas G from the upper part of the shell 11 to the lower part of the shell 11 and releasing the gas G from the upper part of the shell 11 when the detected ammonia concentration is lower than a preset gas concentration reference value.

[0146] In the gas treatment methods S10 and S20 in the scrubbing tower devices 10 and 10B, when the ammonia concentration of the gas G detected by the ammonia concentration meter 100 is equal to or higher than the preset gas concentration reference value, the gas G from which ammonia has been removed in the shell 11 is circulated to the lower part of the shell 11. By circulating the gas G to the lower part of the shell 11, the absorption of ammonia by the absorbing liquid L is performed multiple times. Therefore, even when ammonia cannot be sufficiently removed in only one contact with the absorbing liquid L, ammonia can be sufficiently removed from the gas G containing ammonia. And, therefore, there is no need to increase the amount of the absorbing liquid L or increase the capacity of the shell 11. Therefore, the release of ammonia to the outside can be suppressed while suppressing the increase in the flow rate of the absorbing liquid L and the increase in the capacity of the shell 11.

[0147] Industrial Applicability

[0148] According to the scrubber apparatus and the gas treatment method in the scrubber apparatus of the present invention, it is possible to suppress the release of ammonia to the outside while suppressing an increase in the flow rate of the absorbent and an increase in the capacity of the shell.

[0149] Explanation of symbols

[0150] 10, 10B-wash tower device, 11-shell, 11s-internal space, 15-gas supply part, 16-gas supply pipeline, 16a-one end, 16b-other end, 17-on-off valve, 18-auxiliary gas supply pipeline, 19-check valve, 20-liquid dispersion part, 21-liquid dispersion nozzle, 25-absorption liquid supply part, 26-absorption liquid supply pipeline, 26b-other end, 27-fifth valve, 27v-valve drive part, 28-pump, 29-absorption Liquid cooling unit, 40-gas release unit, 41-gas release pipeline, 41a-one end, 45-first valve, 45v-valve driving unit, 50-absorption liquid discharge unit, 51-absorption liquid discharge pipeline, 51a-one end, 55-third valve, 55v-valve driving unit, 60-control device, 61-CPU, 62-ROM, 63-RAM, 64-storage device, 65-signal transceiver module, 71-signal receiving unit, 72-gas flow path control unit, 73-absorption liquid flow path control unit, 74-command signal output unit, 80-gas circulation pipeline, 81-gas circulation connecting pipe, 81a-one end, 81b-the other end, 82-a part of the interval, 83-a part of the interval, 84-fan, 85-second valve, 85v-valve drive unit, 86-check valve, 90-absorption liquid circulation pipeline, 91-absorption liquid circulation connecting pipe, 91a-one end, 91b-the other end, 92-a part of the interval, 95-fourth Valve, 95v-valve drive unit, 100-ammonia concentration meter, 200-ammonia absorption liquid concentration meter, Dv-up and down directions, G-gas, L-absorbing liquid, S10, S20-gas treatment method in washing tower device, S11, S21-process of circulating gas, S12, S22-process of detecting ammonia concentration of gas, S13, S23-process of determining whether it is lower than the gas concentration reference value, S14, S24-process of releasing gas from the upper part of the shell.

Claims

1. A washing tower device, comprising: case; a gas supply unit capable of supplying a gas containing ammonia into the shell; a liquid spreading portion capable of spreading the absorption liquid supplied from the outside of the shell from the upper portion of the shell; a gas release portion capable of releasing gas from an upper portion of the housing; an absorption liquid discharge portion capable of discharging the absorption liquid from the lower portion of the shell; and The gas circulation pipeline can circulate the gas from the upper part of the shell to the lower part of the shell.

2. The scrubber apparatus according to claim 1, further comprising: a first valve that opens and closes a flow path of the gas from the housing to the gas release portion; a second valve that opens and closes a flow path of the gas from the housing to the gas circulation pipeline; and The ammonia concentration meter detects the ammonia concentration of the gas flowing from the housing to the gas release portion.

3. The scrubber apparatus according to claim 2, further comprising: The gas flow path control unit controls opening and closing of the first valve and the second valve according to the ammonia concentration of the gas detected by the ammonia concentration meter.

4. The washing tower device according to claim 3, wherein: In the gas flow path control unit, When the ammonia concentration of the gas detected by the ammonia concentration meter is lower than a preset gas concentration reference value, the first valve is opened and the second valve is closed, When the ammonia concentration of the gas detected by the ammonia concentration meter becomes equal to or higher than a preset gas concentration reference value, the first valve is closed and the second valve is opened.

5. The scrubbing tower device according to claim 1 or 2, further comprising: An absorption liquid circulation pipeline, capable of circulating the absorption liquid from the lower part of the shell to the upper part of the shell through the liquid dispersion part; a third valve for opening and closing a flow path of the absorption liquid discharged from the housing to the absorption liquid discharge portion; a fourth valve, opening and closing a flow path of the absorption liquid from the shell to the absorption liquid circulation pipeline; and The ammonia absorbing liquid concentration meter detects the ammonia concentration of the absorbing liquid in the shell.

6. The scrubbing tower device according to claim 5, further comprising: The absorbent flow path control unit controls the opening and closing of the third valve and the fourth valve according to the ammonia concentration of the absorbent detected by the ammonia absorbent concentration meter.

7. The scrubber apparatus according to claim 6, wherein: In the absorption liquid flow path control unit, When the ammonia concentration of the absorbent detected by the ammonia absorbent concentration meter is lower than a preset absorbent concentration reference value, the third valve is closed and the fourth valve is opened, When the ammonia concentration of the absorbent detected by the ammonia absorbent concentration meter becomes equal to or higher than a preset absorbent concentration reference value, the third valve is opened and the fourth valve is closed.

8. The scrubber apparatus according to claim 7, further comprising: an absorption liquid supplying unit for supplying the absorption liquid from the outside of the housing to the liquid dispersing unit; and a fifth valve for opening and closing a flow path of the absorption liquid from the absorption liquid supply unit to the liquid diffusion unit, The absorption liquid flow path control unit opens the fifth valve when the ammonia concentration of the absorption liquid detected by the ammonia absorption liquid concentration meter becomes equal to or higher than a preset absorption liquid concentration reference value.

9. The scrubbing tower device according to claim 1 or 2, further comprising: The absorbent cooling unit can cool the absorbent diffused from the upper portion of the casing by the diffuser.

10. The scrubbing tower device according to claim 1 or 2, further comprising: A fan sends the gas out from the upper part of the housing.

11. A gas treatment method in a scrubbing tower device, which is the gas treatment method in a scrubbing tower device according to claim 1 or 2, the gas treatment method comprising: A step of supplying ammonia-containing gas into the shell while scattering water supplied from outside the shell from an upper portion of the shell and circulating the gas from the upper portion of the shell to the lower portion of the shell; a step of detecting an ammonia concentration of the gas released from an upper portion of the housing; and A process of stopping the circulation of the gas from the upper portion of the casing to the lower portion of the casing and releasing the gas from the upper portion of the casing when the detected ammonia concentration is lower than a preset gas concentration reference value.

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