Ammonia removal equipment and scrubber used therein

Abstract

In a treatment device that introduces ammonia gas and absorbs it into water, the pressure loss is reduced to improve absorption capacity, enabling the recovery of large volumes of low-pressure ammonia gas. [Solution] In a scrubber 11 in which an absorption section 14 for absorbing ammonia gas into water is provided above a water storage section 12 that stores water, and ammonia gas is brought into contact with the water flowing down the absorption section 14, the absorption section 14 is made up of partition plates 31 spaced apart in the vertical direction, and an injection mechanism 33 is provided that sprays water along the upper surface of the partition plates 31. An intake gas introduction section 34 where ammonia gas is present is formed above the nozzle of the injection mechanism 33. Furthermore, the area in the partition plate 31 through which water flows from the nozzle is made porous with through holes that form a water film consisting of the water flowing on the surface.

Description

Technical Field

[0005] , ,

[0006]

[0001] The present invention relates to a device for removing ammonia gas in equipment for storing and supplying ammonia used, for example, in power generation fuel and denitrification.

Background Art

[0002] Patent Document 1 below discloses an ammonia storage and supply base for supplying ammonia gas to a boiler of a thermal power plant. Ammonia that does not generate carbon dioxide during combustion is attracting attention as a fuel that plays an important role in decarbonization, and an expansion of its use is expected.

[0003] The ammonia is stored in a tank as liquid ammonia and used. The storage may be carried out under high pressure or at low temperature. When storing under high pressure, a tank having sufficient strength is required. However, it is difficult to make the tank for storing under high pressure have a large capacity for large-scale consumption. Therefore, a low-temperature storage tank is used for the tank of Patent Document 1.

[0004] In low-temperature storage, boil-off gas always occurs from liquid ammonia. Therefore, a boil-off gas treatment facility is connected to the low-temperature storage tank of Patent Document 1 to reliquefy the boil-off gas and return it to the tank, and the pressure of the low-temperature storage tank is kept constant. The boil-off gas treatment facility is configured to boost the boil-off gas to a predetermined pressure with a compressor and liquefy it with cooling water in a condenser.

[0005] In addition to treating the boil-off gas in this way, a safety valve is provided in the tank to ensure safety when the internal pressure of the tank suddenly rises. The ammonia gas discharged through the safety valve is treated with a separate decontamination device.

[0006] Generally, ammonia gas is dissolved in water to detoxify it, and one method for doing so involves using a dilution tank. This is done by blowing ammonia gas into the bottom of a dilution tank containing water. However, if the released ammonia gas is not at high pressure, it is difficult to dissolve due to the hydrostatic pressure. In other words, the method using a dilution tank cannot be used when liquefied ammonia is not stored in a high-pressure tank but at low temperatures, because the released gas pressure will be low.

[0007] Another method involves using a packed tower. However, in this case, the pressure loss is large relative to the absorption capacity. For this reason, packed towers are also unsuitable for processing low-pressure gases. If a fan (exhaust fan) is installed in front of the packed tower to forcibly dissolve ammonia gas, there is the disadvantage that air will be mixed with the ammonia gas. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2023-105853 [Overview of the project] [Problems that the invention aims to solve]

[0009] The main objective of this invention is to reduce pressure loss and increase absorption capacity so that large volumes of low-pressure ammonia gas can be recovered. [Means for solving the problem]

[0010] This invention provides the following scrubber (exhaust gas treatment device).

[0011] In other words, a scrubber in which an absorption section for absorbing ammonia gas into water is provided above a water storage section, and an exhaust gas introduction space for introducing ammonia gas is formed between the absorption section and the water storage section, is configured such that the absorption section is made up of partition plates spaced apart vertically, and includes an injection mechanism that sprays water along the upper surface of the partition plates. An intake gas introduction section where ammonia gas is present is formed above the nozzle of the injection mechanism, and the area on the partition plate through which water flows from the nozzle is configured to be porous with through holes that form a water film made of water flowing on the surface.

[0012] Such a scrubber sends the emitted ammonia gas or ammonia water containing dissolved ammonia gas to a downstream stage, and separates the ammonia, for example, in a dissolved form.

[0013] In the above configuration, unlike the packing material in a packed tower, the absorption section forms a water film on the partition plate, including through holes, as water injected from the nozzle of the injection mechanism forcibly draws in ammonia gas present in the suction gas inlet. The ammonia gas drawn into this water film and the rising ammonia gas come into contact over a wide area with minimal pressure loss, and this contact occurs across multiple layers in the vertical direction. [Effects of the Invention]

[0014] According to this invention, the scrubber has a configuration that allows for low pressure loss and a large contact area with water, so it can adequately process both low-pressure and large-volume ammonia gas. Furthermore, the scrubber efficiently obtains either released ammonia gas or ammonia water in which ammonia gas has dissolved. [Brief explanation of the drawing]

[0015] [Figure 1] A structural diagram illustrating the overview of a scrubber. [Figure 2] Schematic diagram of an ammonia removal system. [Figure 3] Schematic diagram of an ammonia removal system. [Figure 4]Schematic structural diagram of ammonia removal device. [Figure 5] Perspective view of the absorption part of the scrubber. [Figure 6] Cross-sectional view showing the structure of the main part of the scrubber. [Figure 7] Plan view showing the water injection direction from the injection mechanism part of the partition plate. [Figure 8] Cross-sectional view showing the operating state. [Figure 9] Cross-sectional view showing the structure of the absorption part according to another example. [Figure 10] Plan view showing the water injection direction from the injection mechanism part in the partition plate according to another example.

Mode for Carrying Out the Invention

[0016] One embodiment for carrying out this invention will be described below with reference to the drawings.

[0017] The scrubber according to the invention is a water absorption type exhaust gas treatment device that absorbs and treats surplus gas in facilities handling ammonia such as thermal power generation and denitrification with water, and is incorporated into an ammonia removal device according to the application. The surplus gas (exhaust gas) to be treated includes, for example, boil-off gas discharged through a safety valve to prevent the pressure rise of an ammonia tank, and ammonia gas released during blowdown in regular inspections and the like. The state includes not only the case of only gas (gas), but also the cases of gas-liquid mixed state and liquid state.

[0018] First, the scrubber 11 as an absorption tower will be described, and then the ammonia removal device 71 will be described.

[0019] The scrubber 11 has a structure that allows for effective dissolution of ammonia gas with low pressure loss even at extremely low pressures. Specifically, as shown in Figure 1, the scrubber 11 has, from bottom to top, a water reservoir 12, an exhaust gas introduction space 13, an absorption section 14, and an upper space 15. The water reservoir 12, located at the bottom, stores water. An inlet 16 for introducing ammonia gas (GNH3) as exhaust gas is formed on the side of the exhaust gas introduction space 13, which is above the water reservoir 12. An exhaust gas introduction passage 17 for introducing exhaust gas from ammonia handling equipment is connected to the inlet 16. The absorption section 14, above the exhaust gas introduction space 13, absorbs ammonia gas by bringing it into contact with water. The upper space 15, which is above the absorption section 14, contains rising ammonia gas. In the drawing, solid dashed arrows indicate exhaust gas, and thick arrows indicate water.

[0020] The water storage section 12 and the absorption section 14 are connected externally by a circulation path 18. Specifically, a circulation path 18 is provided to circulate the water from the water storage section 12 to the absorption section 14, and the circulation path 18 is equipped with a circulation pump 18a.

[0021] In addition to these, the scrubber 11 is equipped with a water supply channel 19 for supplying water to the water storage section 12 and a cooler 21 for increasing the solubility of ammonia gas (Figures 2 to 4). In the figures, 22 is a chiller that supplies refrigerant to the cooler 21. In addition to these, an ammonia gas outlet channel 25 (Figures 2 and 3) for releasing ammonia gas from the upper space 15 or an ammonia water outlet channel 26 (Figure 4) for releasing ammonia water from the water storage section 12 is connected.

[0022] As shown in Figure 5, the absorption section 14 is composed of a group of partition plates 32, which are made up of multiple partition plates 31. Water from the circulation path 18 is supplied onto the partition plates 31 to forcibly dissolve ammonia gas by drawing it in.

[0023] The partition plates 31 are spaced apart vertically. In this example, the partition plates 31 are flat and have a surface that extends horizontally. Since Figure 5 shows an example where the absorbent section 14 is a cylindrical shape with a circular shape in plan view, the plan view shape of the partition plates 31 is circular.

[0024] To supply water onto the partition plate 31, the partition plate 31 is equipped with an injection mechanism 33 that sprays water along its upper surface. The injection mechanism 33 is integrally formed with the edge of the partition plate 31 and has a nozzle 33a that sprays water inward horizontally. Above the nozzle 33a of the injection mechanism 33, an intake gas introduction section 34 where ammonia gas is present is formed.

[0025] In the illustrated example, multiple partition plate groups 32 are arranged vertically at intervals, specifically two groups, to form the absorption section 14. Figure 6 shows the vertical cross-sectional structure of the absorption section 14.

[0026] The partition plate group 32 is configured to form the above-mentioned suction gas introduction section 34 by arranging three partition plates 31 equipped with an injection mechanism 33. In other words, in addition to the three partition plates 31, the partition plate group 32 is provided with an upper end plate 35 above the uppermost partition plate 31, and the suction gas introduction section 34 is formed between the partition plates 31 and between the partition plates 31 and the upper end plate 35.

[0027] Specifically, the injection mechanism 33 is configured to inject inward as described above, and the injection mechanism 33 of the partition plate 31 is positioned such that it protrudes inward, shifted in position from the lower partition plate 31 to the right, corresponding to the injection direction of the injection mechanism 33.

[0028] The three partition plates 31 have a central hole 36 that penetrates through them in the thickness direction, and a spray mechanism 33 is formed on the outer edge. The spray mechanism 33 is formed in the shape of a groove that forms an annular shape in plan view, and a nozzle 33a opens on the upper surface of the partition plate 31. The nozzle 33a sprays water toward the center of the central hole 36, as indicated by the arrow in Figure 7. The nozzle 33a may be present all around or only partially.

[0029] The three partition plates 31 are formed with smaller outer diameters from the bottom partition plate 31 downwards, causing the injection mechanism 33 to be offset inwards. The upper end plate 35, as seen in Figure 6, is formed with a slightly larger diameter than the uppermost partition plate 31, has a central hole 35a that penetrates through the center in the thickness direction, and has a downward-extending hanging wall 35b on its outer edge.

[0030] The injection mechanism 33 is arranged such that the lower inner corner of one injection mechanism 33 is spaced apart from the upper outer corner of the injection mechanism 33 below it, creating a gap 37. The injection mechanism 33 of the uppermost partition plate 31 is positioned slightly inward from the hanging wall 35b of the upper end plate 35, providing the same gap 37 as between the injection mechanism 33s. With this arrangement, the rising ammonia gas is guided through the gap 37 to the top of the nozzle 33a, thus forming a suction gas introduction section 34 above the nozzle 33a.

[0031] The area of ​​the partition plate 31 through which water flows from the nozzle 33a is formed in a porous manner with through holes 39 on which a water film 38 made of water flowing on the surface is formed. In other words, the partition plate 31 has multiple through holes 39 of a size that allows a water film 38 to form on the inner surface of the holes as water flows down the surface. The formation of a water film on the inner surface of the holes means that the holes are not blocked by water, but rather the opening of the through holes 39 is maintained. The size of the through holes 39 is related to the surface tension of water, and is determined by the shape of the through holes 39, the inclination during installation, the temperature, etc. The size of the through holes 39 should be as small as possible among the sizes on which a water film 38 can form on the inner surface of the holes. This is to maximize the area of ​​the water film 38. The structure of the part of the partition plate 31 having through holes 39 can be made of perforated metal with circular holes as the through holes 39, as shown in the illustrated example, or it can be made of, for example, a metal mesh. Such through holes 39 are also formed in the upper end plate 35.

[0032] As shown in Figure 6, the ammonia gas that enters the exhaust gas introduction space 13 from the inlet 16 rises and is drawn in and forcibly brought into contact with the water sprayed from the nozzle 33a of the injection mechanism 33, and also comes into contact with the water descending through the through hole 39 and the central holes 36 and 35a.

[0033] Specifically, as shown in Figure 8, when water is sprayed from the nozzle 33a, ammonia gas from the suction gas introduction section 34 is drawn in. The sprayed water flows over the surface of the partition plate 31, creating an airflow and forming a water film 38 as shown by the dashed lines. The water sprayed from the nozzle 33a, which spreads and flows down without interruption, forms a water film 38 on the upper and lower surfaces of the partition plate 31, as well as on the inner surface of the through-holes 39 that connect them. Meanwhile, the ammonia gas rises against the movement of the water through the partition plate 31 covered with the water film 38, the gaps between the partition plates 31 and each other, and the gaps 37 between the partition plate 31 and the upper end plate 35. The ammonia gas passes over the surface of the partition plate 31, as well as through the through-holes 39 and the gaps 37, repeatedly passing over the partition plate 31. In the process of rising, the ammonia gas comes into contact with water and is absorbed, and the water containing dissolved ammonia gas flows down and accumulates in the water storage section 12.

[0034] Here, we will briefly describe some other examples of the specific configuration of the absorption section 14. In this description, parts that are common with the previously described configuration, such as the through-hole 39, will be denoted by the same reference numerals as before, and their detailed explanation will be omitted.

[0035] Figure 9 shows an example in which the direction of water injection from the injection mechanism 33 is directed radially outward, unlike the partition plate 31 described above. That is, the injection mechanism 33 is integrally formed on the inner peripheral edge of the partition plate 31, which is formed in an annular shape in plan view, and the injection mechanism 33 is configured to inject water outward on the upper surface of the partition plate 31. The injection mechanism 33 of the partition plate 31 is positioned such that it protrudes outward, shifted in a direction corresponding to the injection direction of the injection mechanism 33, with the lower partition plate 31 being the one that protrudes further outward.

[0036] Figure 10 shows a device similar to the partition plate 31 in Figure 6, with an injection mechanism 33 on its outer edge. However, instead of forming nozzles 33a around the entire circumference and directing the injection direction towards the center, the nozzles 33a are partially formed and set at an inward angle. In this case as well, since the injection direction is inward, the direction of positional displacement in the arrangement of the injection mechanism 33 is the same inward direction as shown in Figure 6.

[0037] A scrubber 11 equipped with an absorption section 14 as described above constitutes an ammonia abatement device 71 as follows. The way in which the scrubber 11 is applied to the ammonia abatement device 71 can be broadly divided into two types depending on the treatment method. One is a batch type, and the other is a continuous type.

[0038] The batch type is an operating method in which ammonia gas absorption (dissolution) and release are performed in a single tower, and the treatment is performed each time exhaust gas is introduced. The exhaust gas includes boil-off gas and ammonia gas generated during blowdown. This device is suitable for use in facilities equipped with small or medium-sized ammonia tanks.

[0039] The batch-type ammonia abatement system 71, as shown in Figure 2, is equipped with a scrubber 11 with the aforementioned configuration at the uppermost position. As described above, the scrubber 11 has a water storage section 12, an exhaust gas introduction space 13, an absorption section 14, an upper space 15, an inlet 16, a circulation path 18, a circulation pump 18a, a water supply path 19, and a cooler 21. In particular, the batch type is equipped with a heater 72 in the circulation path 18. The heater 72 has the function of releasing ammonia gas from the ammonia water sent to the absorption section 14. The water after the ammonia gas has been released and separated flows down through the absorption section 14, while the released ammonia gas moves to the upper space 15.

[0040] The aforementioned ammonia gas outlet 25, which recovers the emitted ammonia gas, is connected to this upper space 15. Connected to the end of the ammonia gas outlet 25 are a compressor 73 and a liquefaction unit 74, which serve as a liquefaction device for liquefying the recovered ammonia gas, and a recovery tank 75 for recovering the liquefied ammonia liquefied by the liquefaction means. In the diagram, 76, which is the stage before the compressor 73, is a mist separator.

[0041] The ammonia removal device 71, consisting of these components, has a computer-controlled control unit (not shown), which performs the following operations.

[0042] If the ammonia gas being introduced is a boil-off gas, the ammonia handling facility should be equipped with a pre-release detection means to detect the stage immediately before the boil-off gas is released, on the ammonia tank side where the ammonia gas is stored. The pre-release detection means can consist of a pressure switch installed in the ammonia tank, which detects the set pressure of the safety valve (low-pressure safety valve) in the off-gas line that releases the boil-off gas. The off-gas line should also be equipped with a blow-off detection means to detect when the safety valve stops blowing or blows out. The blow-off detection means can consist of, for example, a flow meter installed downstream of the safety valve in the off-gas line.

[0043] The control unit starts the circulation pump 18a based on the detection signal from the pre-discharge detection means. The refrigerator 22 and liquefier 74 are kept in standby (operating) mode.

[0044] Subsequently, when the safety valve of the off-gas line opens, the exhaust gas (ammonia gas) introduced into the exhaust gas introduction space 13 comes into contact with the cooled water flowing from the water storage section 12 through the circulation path 18 to the absorption section 14. In the absorption section 14, the water is ejected along the surface of the partition plate 31, which has through holes 39. At this time, the gas in the suction gas introduction section 34 is pulled by the water and forcibly dissolved. The water flowing over the partition plate 31 forms a wide water film 38 on the surface of the partition plate 31, and the ammonia gas comes into contact with this water film 38 and dissolves. As a result, the ammonia concentration in the water of the water storage section 12 increases.

[0045] After the safety valve has finished operating, that is, after it has stopped blowing and the system is completely safe, the heater 72, compressor 73, and liquefaction unit 74 are manually started to draw in the ammonia gas discharge passage 25 and liquefy it. The liquefied ammonia is then recovered in the recovery tank 75.

[0046] In this manner, the batch-type ammonia abatement device 71 efficiently adsorbs ammonia with low pressure loss by utilizing a large-area water film 38, even when the ammonia gas is released at low or extremely low pressure through a low-pressure safety valve.

[0047] Furthermore, since the adsorption and detachment of ammonia gas to obtain liquefied ammonia are performed in a single column, namely the scrubber 11, there is no need to have another column, such as a distillation column, resulting in a simple configuration, and the entire ammonia abatement device 71 can be made compact.

[0048] Furthermore, the water in the reservoir 12 is circulated, and the ammonia gas emitted from the scrubber 11 is discharged, so the water can be used for the next recovery treatment. In other words, it can be a closed system that basically does not require new water supply.

[0049] Similarly, if the ammonia gas being introduced is the same as that used for blowdown, the circulation pump 18a is operated in advance before introducing the ammonia gas, and other necessary equipment is put into standby (operational) mode. After the introduction is complete, the compressor 73 is started.

[0050] As mentioned above, the batch-type ammonia abatement device 71 has a simple configuration and can be miniaturized, so it can be made into a mobile ammonia abatement device 71 that does not have a recovery tank 75, as shown in Figure 3.

[0051] A mobile system is one in which the batch-type ammonia abatement device 71 can be treated as a single unit and is transportable by being mounted on a vehicle such as a truck.

[0052] In the mobile ammonia abatement device 71, a movable cylinder 76 is connected instead of a recovery tank 75 to recover liquefied ammonia.

[0053] The mobile ammonia abatement device 71 is particularly suitable for recovering ammonia gas during blowdown.

[0054] The continuous system is an operating method in which ammonia gas absorption (dissolution) and release are performed in separate towers, and the treatment is carried out continuously, including during the introduction of exhaust gas. This system is suitable for use in facilities equipped with large ammonia tanks.

[0055] As shown in Figure 4, the continuous ammonia abatement system 71 is equipped with a scrubber 11 with the above configuration at the uppermost part. The scrubber 11 has a water storage section 12, an exhaust gas introduction space 13, an absorption section 14, an upper space 15, an inlet 16, a circulation path 18, a circulation pump 18a, a water supply path 19, and a cooler 21, as described above.

[0056] The ammonia water outlet 26, which discharges ammonia water that has absorbed ammonia gas, is connected to the upper part of the water storage section 12, and a distillation column 77, which separates ammonia gas and water, is connected to the end of the ammonia water outlet 26. The water separated in the distillation column 77 is water that allows for the discharge of wastewater with a low ammonia concentration.

[0057] A condenser 79 is provided at the top of the distillation column 77 in the withdrawal passage 78 to liquefy the obtained ammonia gas, thereby obtaining liquid ammonia as distillate. The liquid ammonia can be returned to the ammonia tank. In Figure 4, 81 is a booster pump 81 for transferring the fluid to a position higher than itself.

[0058] A water extraction channel 82, which extracts water (dilute ammonia water that can be drained) from the bottom of the distillation column 77, is connected to a distillation return line 83 that returns the extracted water back to the distillation column 77. A reboiler 84 for heating and boiling the water is provided in the distillation return line 83.

[0059] The distillation return line 83 can also be connected to an absorption return line 85, which allows the separated water to be sent back to the scrubber 11. The absorption return line 85 may be equipped with a cooler 86 for cooling the water passing through it.

[0060] The ammonia removal device 71, consisting of these components, has a computer-controlled control unit (not shown), which performs the following operations.

[0061] In the case of a continuous ammonia abatement system 71, the circulation pump 18a, etc., is kept running at all times. As described above, the ammonia tank side of the ammonia handling equipment that stores ammonia gas may be equipped with the same pre-release detection means as described above to detect the stage before the release of boil-off gas, and may be activated based on the detection signal from the pre-release detection means. The off-gas line is also equipped with a blow detection means to detect when the safety valve stops blowing or blows out. The blow detection means can be configured, for example, as a flow meter installed downstream of the safety valve in the off-gas line.

[0062] When the safety valve of the off-gas line opens, the exhaust gas (ammonia gas) introduced into the exhaust gas introduction space 13 comes into contact with cooled water flowing from the water storage section 12 through the circulation path 18 to the absorption section 14. In the absorption section 14, the water is ejected along the surface of the partition plate 31, which has through holes 39. At this time, the gas in the suction gas introduction section 34 is pulled by the water and forcibly dissolved. The water flowing over the partition plate 31 forms a wide water film 38 on its surface, and the ammonia gas comes into contact with this water film 38 and dissolves. As a result, the ammonia concentration in the water of the water storage section 12 increases.

[0063] After receiving the safety valve open signal, the control unit starts the booster pump 81 once the ammonia concentration in the water storage unit 12 has risen to a certain level. The booster pump 81 can be started based on the time elapsed since the detection of the rising ammonia concentration by a sensor or the blowout from the safety valve by a blowout detection means.

[0064] When the booster pump 81 is activated, it pressurizes the ammonia water and sends it to the distillation column 77. The ammonia gas distilled in the distillation column 77 and exiting through the extraction channel 78 is liquefied in the condenser 79 to become liquefied ammonia, which is then recovered. Meanwhile, the water extracted from the water extraction channel 82 is returned to the distillation column 77 through the reboiler 84, becoming water with a lower ammonia concentration, and can be discharged as wastewater. In parallel or selectively, the water extracted from the water extraction channel 82 is supplied to the scrubber 11 through the absorption return line 85 and used again to absorb ammonia gas. The control unit is configured to perform these flow path switching operations using PID control or the like based on the ammonia concentration in each section.

[0065] The ammonia abatement device 71, equipped with the scrubber 11 configured as described above, actively draws in ammonia gas using water jets on the partition plates 31 that constitute the absorption section 14 of the scrubber 11, thereby forcibly dissolving it. Furthermore, the partition plates 31 are formed in a porous manner and spaced apart. As a result, pressure loss is small, allowing even low-pressure boil-off gas to be absorbed by the water. Moreover, since a water film 38 is formed on the surface of the partition plates 31, including the through holes 39, a large area of ​​the water film 38 can be obtained, allowing for efficient contact with the ammonia gas. Furthermore, since the jetting mechanism 33 of the vertically positioned partition plates 31 is offset radially, the rising ammonia gas can be discharged with high efficiency. As a result, even large amounts of ammonia gas can be dissolved efficiently without leakage.

[0066] Furthermore, the configuration is simplified because the suction gas introduction section 34 is formed by arranging three partition plates 31 equipped with an injection mechanism section 33 and an upper end plate 35.

[0067] Furthermore, the ammonia abatement device 71 equipped with such a scrubber 11 is configured to operate the circulation pump 18a before the safety valve blows out when boil-off gas is introduced as exhaust gas, so that ammonia gas can be recovered and processed without leakage.

[0068] The batch-type ammonia abatement device 71, in particular, is configured to dissolve and remove ammonia in the scrubber 11, allowing for a compact and small-scale design that can be used for a variety of applications.

[0069] Furthermore, the continuous ammonia abatement system 71 is equipped with an absorption return line 85 that returns distilled and dischargeable water to the scrubber 11, thus enabling a closed system that eliminates or reduces the need for new water supply.

[0070] The above configuration is one embodiment for carrying out this invention, and this invention is not limited to the above configuration; other configurations can also be adopted.

[0071] For example, the partition plate 31 may be inclined with respect to the horizontal. The through-hole 39 may not be circular in shape; a hexagonal shape can be used to obtain a larger surface area water film 38.

[0072] The injection mechanism can also be configured using an injection nozzle separate from the partition plate. The suction gas introduction section can be designed according to the configuration of the injection mechanism.

[0073] The heater 72 in the circulation path 18 of the scrubber 11 of the batch-type ammonia abatement device 71 can also be provided in the water storage section 12. Furthermore, the arrangement of the heater 72 and the cooler 21 is not limited to that shown in the figure; for example, they can be reversed. Both the heater 72 and the cooler 21 can be appropriately configured with cooling water or steam, provided there is a sufficient heat source, so the installation location can be selected as appropriate.

[0074] Furthermore, in the batch-type ammonia abatement system 71, it is also possible to use the recovered ammonia in gaseous form without a liquefaction device.

[0075] In the batch-type ammonia abatement device 71, ammonia recovery may be performed automatically by a control unit rather than manually as described above. [Explanation of Symbols]

[0076] 11... Scrubber 12...Water storage section 14… Absorbent part 18...Circulation path 25…Ammonia gas outlet 26…Ammonia water outlet 31… Partition board 32...Partition Plates 33...Injection mechanism section 33a…spout 34... Suction gas introduction section 37… Gap 38…Water film 39…Through hole 71... Ammonia removal equipment 72…Warmer 73... Compressor 74...Liquifier 77…Distillation column 85... Absorption return line

Claims

1. A scrubber in which an absorption section for absorbing ammonia gas into water is provided above a water storage section, and an exhaust gas introduction space for introducing ammonia gas is formed between the absorption section and the water storage section, The absorption section is configured by arranging partition plates vertically spaced apart. The system includes a spraying mechanism that sprays water along the upper surface of the partition plate, A suction gas introduction section is formed above the nozzle of the injection mechanism, where ammonia gas is present. The region in the partition plate through which water flows from the nozzle is porous, having through holes that form a water film consisting of water flowing on the surface. Scrubber.

2. The injection mechanism is integrally formed with the edge of the partition plate. The scrubber according to claim 1.

3. A group of partition plates is provided, consisting of multiple partition plates forming a single unit. The injection mechanism provided on the partition plate in the partition plate group is configured to inject material inward or outward on the upper surface of the partition plate. The injection mechanism is arranged such that the lower part of the mechanism protrudes outward and inward in a direction corresponding to the injection direction of the injection mechanism. The scrubber according to claim 1 or claim 2.

4. An ammonia abatement device equipped with a scrubber that absorbs ammonia gas into water, The scrubber comprises the scrubber described in claim 1 or claim 2, A circulation path is provided in the scrubber for circulating the water from the reservoir to the absorption section. An ammonia gas outlet is connected to the portion of the scrubber above the absorption section to recover the emitted ammonia gas. Ammonia removal device.

5. It is mobile. The ammonia removal apparatus according to claim 4.

6. An ammonia abatement device equipped with a scrubber that absorbs ammonia gas into water, The scrubber comprises the scrubber described in claim 1 or claim 2, A circulation path is provided in the scrubber for circulating the water from the reservoir to the absorption section. The water reservoir of the scrubber is connected to an ammonia water outlet passage for draining the ammonia water from the reservoir that has absorbed ammonia. A distillation column for separating ammonia water into liquefied ammonia and water is connected to the end of the aforementioned ammonia water outlet. Ammonia removal device.

7. An absorption return line is connected to the bottom of the distillation column to return the separated water to the circulation path. The ammonia removal apparatus according to claim 6.

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