An acid ammonia removal stripper column for coal gas water treatment process

Abstract

This invention discloses an acid and ammonia removal stripping tower for coal gas-water treatment processes, relating to the field of acid and ammonia removal stripping technology. The stripping tower includes a base, a tower body fixedly mounted on the top of the base, a tower top fixedly mounted on the upper surface of the tower body, and an exhaust pipe fixedly mounted on the upper surface of the tower top. Water inlet pipes and alkali addition pipes are respectively arranged on the left and right sides of the top of the tower body. Water vapor is discharged into the interior of the tower body through four first gas distribution pipes and several second gas distribution pipes, uniformly mixing with the coal gas and water. This causes NH3 and gases such as CO2, H2, CO, and H2S in the coal gas and water to be converted into gaseous phases, thereby removing NH3-N and gases such as CO2, H2, CO, and H2S from the water. This effectively prolongs the flow time of the coal gas and water inside the tower body and ensures sufficient contact between water vapor and the coal gas and water, improving the acid and ammonia removal capacity and practicality of the device.

Description

Technical Field

[0001] This invention relates to the field of acid and ammonia removal stripping technology, and particularly to an acid and ammonia removal stripping tower for use in coal gas-water treatment processes. Background Technology

[0002] Ammonia is oxidized in the atmosphere to produce NOx, forming acid rain, and further oxidized to nitrates, which enter the water cycle and pollute groundwater. Furthermore, ammonia poses a health hazard, causing severe lung infections and respiratory failure leading to death. Sulfur dioxide oxidizes in the atmosphere to form sulfuric acid mist or sulfate aerosols, a significant precursor to environmental acidification. When atmospheric sulfur dioxide concentration is 0.21 ppm and particulate matter concentration is greater than 0.3 mg / L, the incidence of respiratory diseases increases, and the condition of patients with chronic diseases deteriorates rapidly—all due to the synergistic effect of these factors.

[0003] In recent years, with the rapid development of the coal chemical industry, a large amount of ammonia-containing water is generated in the coal gasification process using coal as raw material. The ammonia-containing water often contains dissolved gases such as CO2, H2, CO, and H2S. Existing stripping towers for removing acid and ammonia from coal gas water mostly adopt fixed multi-stage trays. Coal gas water enters from the top of the stripping tower and flows through each stage of trays in sequence. Then, steam carries away the ammonia in the coal gas water. However, the existing fixed trays cannot effectively extend the flow time of coal gas water, and the existing steam is discharged from the bottom to the top, which cannot be uniformly mixed with the coal gas water, thus reducing the acid and ammonia removal capacity of the unit. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide an acid and ammonia removal stripping tower for coal gas and water treatment processes. This tower can solve the problems that existing fixed tower plates cannot effectively extend the flow time of coal gas and water, and that existing steam is discharged from the bottom to the top and cannot be evenly mixed with coal gas and water, thus reducing the acid and ammonia removal capacity of the device.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: an acid and ammonia removal stripping tower for a coal gas water treatment process, comprising a stripping tower base, a tower body fixedly installed at the top of the stripping tower base, a tower top fixedly installed on the upper surface of the tower body, and an exhaust pipe inserted and fixedly installed on the upper surface of the tower top.

[0008] The tower body has a water inlet pipe and an alkali addition pipe installed on the left and right sides of the top interior.

[0009] The tower body has several guide plates evenly fixed on the left and right sides inside, and the guide plates on the left and right sides are arranged in an inclined and staggered manner.

[0010] A collection trough is fixedly installed at the bottom of the tower body;

[0011] Among them, rectangular slots are opened on the left and right sides of the upper surface of the tower body at the middle position of the longitudinal direction, and air intake devices are installed inside the two rectangular slots.

[0012] A filtration device is installed at the top rear side of the outer surface of the tower.

[0013] Preferably, the water inlet pipe and the alkali addition pipe are respectively inserted and fixedly installed on the left and right sides of the top of the tower body, and the opposite ends of the water inlet pipe and the alkali addition pipe are respectively located above the left and right sides of the guide plate, and a diversion plate is fixedly installed on the opposite ends of the water inlet pipe and the alkali addition pipe.

[0014] Preferably, a flow collecting plate is fixedly installed on the upper surface of one end of each of the several guide plates away from the inner wall of the tower body, and several flow guiding holes are evenly opened on the upper side of the left and right surfaces of the several flow collecting plates.

[0015] Among them, V-shaped grooves are opened on the upper surface of several guide plates corresponding to the positions of several guide holes.

[0016] Preferably, a discharge pipe is fixedly installed at the center of the bottom of the collection tank, the end of the discharge pipe away from the collection tank penetrates through the outer surface of the tower body, and a discharge valve is provided on the outer surface of the end of the discharge pipe away from the collection tank.

[0017] Preferably, the air intake device includes two air intake pipes, which are respectively fixedly installed inside two rectangular slots at positions corresponding to several guide trays. A second air distribution pipe is inserted and fixedly installed at the position between two adjacent guide trays on the opposite sides of the two air intake pipes. The ends of the several second air distribution pipes away from the air intake pipes all penetrate into the interior of the tower body.

[0018] Two first air distribution pipes are fixedly installed on the opposite surfaces of the two air inlets, corresponding to the position below the bottom guide plate.

[0019] Preferably, a drain plate is fixedly installed at the bottom of the tower body, corresponding to the position below the first gas distribution pipe, and the upper surface of the drain plate is evenly provided with drain holes.

[0020] Preferably, a first connecting pipe is inserted and fixedly installed at the bottom of the outer surface of the tower body corresponding to the bottom of the two air inlet pipes. The front ends of the two first connecting pipes are fixedly connected to the bottom outer surface of the two air inlet pipes respectively, and the rear ends of the two first connecting pipes are fixedly connected to a second connecting pipe. A third connecting pipe is fixedly installed at the middle of the outer surface of the second connecting pipe.

[0021] Preferably, the filtration device includes a base plate, which is fixedly installed on the rear top position of the outer surface of the tower body, and a filter canister is fixedly installed on the upper surface of the base plate. Exhaust holes are evenly opened on the upper surface of the filter canister away from the center.

[0022] Preferably, the end of the exhaust pipe away from the top of the tower is inserted and fixedly installed on the upper surface of the filter tank, and the end of the exhaust pipe away from the top of the tower extends to the bottom inside the filter tank. A feed pipe is inserted and fixedly installed on the top right side of the outer surface of the filter tank.

[0023] A drain pipe is fixedly installed on the bottom left side of the outer surface of the air filter tank, and a drain valve is installed on the outer surface of the end of the drain pipe away from the air filter tank.

[0024] (III) Beneficial Effects

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] (1) In the process of using the gas-water treatment process, the gas-water to be treated is discharged into the interior of the tower body through the water inlet pipe. The gas-water flows evenly on the upper surface of the guide plate through the diversion plate on the water inlet pipe. The alkaline solution is discharged into the interior of the tower body through the diversion plate on the alkali addition pipe and flows evenly on the upper surface of the guide plate. The gas-water and the alkaline solution are neutralized, so that the NH3-N in the gas-water mainly exists in the state of free ammonia (NH3). The diversion effect of the two diversion plates makes the gas-water and the alkaline solution evenly mixed, thereby improving the stripping efficiency of the device.

[0027] (2) Gas and water accumulate on the inside of the collector plate through several V-shaped grooves. When the gas and water accumulate to the inside of several guide holes, the gas and water flow down through several guide holes onto the upper surface of the next guide plate, which effectively prolongs the flow time of gas and water inside the tower body, making the reaction time of gas and water with steam more sufficient and improving the stripping effect of the device.

[0028] (3) At this time, water vapor is introduced into the second connecting pipe through the third connecting pipe. The water vapor is introduced into the two inlet pipes through the two first connecting pipes. Then, the water vapor is discharged into the interior of the tower body through the four first gas distribution pipes and several second gas distribution pipes, and is evenly mixed with the coal gas water. This causes the NH3 and CO2, H2, CO, H2S and other gases in the coal gas water to be converted into gas phase, thereby removing NH3-N and CO2, H2, CO, H2S and other gases from the water. By setting multiple gas distribution pipes, the water vapor and coal gas water are fully contacted, which improves the acid and ammonia removal capacity and practicality of the device.

[0029] (4) The ammonia stripping tower used in the gas and water treatment process discharges the ammonia gas stripped by steam into the filter tank through the exhaust pipe. The filter tank is filled with acidic solution through the feed pipe. The ammonia gas reacts with the acidic solution and is absorbed by the acid, thus avoiding the ammonia gas from entering the atmosphere with the steam and causing secondary pollution, thereby improving the environmental protection of the device. Attached Figure Description

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0031] Figure 1 This is a schematic diagram of the structure of an acid and ammonia removal stripping tower for a coal gas-water treatment process according to the present invention.

[0032] Figure 2 This is a schematic diagram of the internal structure of the tower body of the present invention;

[0033] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0034] Figure 4 This is a side sectional view of the present invention;

[0035] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0036] Figure 6 This is a schematic diagram of the internal structure of the filtration device of the present invention.

[0037] Reference numerals in the attached drawings: 1. Stripping tower base; 2. Tower body; 3. Tower top; 4. Exhaust pipe; 5. Water inlet pipe; 6. Feed guide tray; 7. Collection trough; 8. Rectangular trough; 9. Alkali addition pipe; 10. Diverter plate; 11. Collector plate; 12. Guide hole; 13. V-groove; 14. Discharge pipe; 15. Discharge valve; 16. Air inlet pipe; 17. Second air distribution pipe; 18. First connecting pipe; 19. Second connecting pipe; 20. Third connecting pipe; 21. First air distribution pipe; 22. Base plate; 23. Air filter tank; 24. Feed pipe; 25. Drain pipe; 26. Drain valve; 27. Exhaust hole; 28. Drain plate; 29. ​​Drain hole. Detailed Implementation

[0038] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0039] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0040] In the description of this invention, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0041] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0042] Please see Figure 1-6 The present invention provides a technical solution: an acid and ammonia removal stripping tower for coal gas water treatment process, including a stripping tower base 1, a tower body 2 fixedly installed at the top of the stripping tower base 1, a tower top 3 fixedly installed on the upper surface of the tower body 2, and an exhaust pipe 4 inserted and fixedly installed on the upper surface of the tower top 3.

[0043] Among them, water inlet pipe 5 and alkali addition pipe 9 are respectively installed on the left and right sides of the top of the tower body 2;

[0044] Among them, several guide plates 6 are evenly fixedly installed on the left and right sides of the interior of the tower body 2. The number of guide plates 6 is determined according to the actual situation, and the several guide plates 6 on the left and right sides are arranged in an inclined and staggered manner.

[0045] Among them, a collection trough 7 is fixedly installed at the bottom of the interior of the tower body 2;

[0046] Among them, rectangular slots 8 are provided on the upper surface of the tower body 2 at the longitudinal middle position on both the left and right sides, and air intake devices are installed inside the two rectangular slots 8.

[0047] A filter device is installed at the top rear side of the outer surface of tower body 2.

[0048] Furthermore, the water inlet pipe 5 and the alkali addition pipe 9 are respectively inserted and fixedly installed on the left and right sides of the top of the tower body 2, and the opposite ends of the water inlet pipe 5 and the alkali addition pipe 9 are respectively located on the upper left and upper right sides of the guide plate 6. Diverter plates 10 are fixedly installed on the opposite ends of the water inlet pipe 5 and the alkali addition pipe 9.

[0049] Furthermore, several guide plates 6 are fixedly installed on the upper surface of one end away from the inner wall of the tower body 2, and several guide holes 12 are evenly opened on the upper side of the left and right surfaces of the several guide plates 11.

[0050] Among them, V-shaped grooves 13 are opened on the upper surface of several guide plates 6 corresponding to the positions of several guide holes 12.

[0051] Furthermore, a discharge pipe 14 is fixedly installed at the center of the bottom end of the collection tank 7. The end of the discharge pipe 14 away from the collection tank 7 passes through the outer surface of the tower body 2, and a discharge valve 15 is provided on the outer surface of the end of the discharge pipe 14 away from the collection tank 7.

[0052] Furthermore, the air intake device includes two air intake pipes 16, which are respectively fixedly installed inside the two rectangular slots 8 at positions corresponding to several guide plates 6. The two air intake pipes 16 are also fixedly installed at positions between two adjacent guide plates 6 on opposite sides. The ends of several second air intake pipes 17 that are away from the air intake pipes 16 all penetrate into the interior of the tower body 2.

[0053] Among them, two first air distribution pipes 21 are inserted and fixedly installed on the opposite surfaces of the two air inlet pipes 16, corresponding to the position below the bottom guide plate 6.

[0054] Furthermore, a drain plate 28 is fixedly installed at the bottom of the tower body 2, corresponding to the position below the first gas distribution pipe 21. Drain holes 29 are evenly opened on the upper surface of the drain plate 28.

[0055] Furthermore, a first connecting pipe 18 is inserted and fixedly installed at the bottom end of the outer surface of the tower body 2, corresponding to the bottom end position of the two air inlet pipes 16. The front ends of the two first connecting pipes 18 are fixedly connected to the bottom end outer surface of the two air inlet pipes 16, and the rear ends of the two first connecting pipes 18 are fixedly connected to a second connecting pipe 19. A third connecting pipe 20 is fixedly installed at the middle position of the outer surface of the second connecting pipe 19. When using this device, the coal gas water to be treated is discharged into the interior of the tower body 2 through the water inlet pipe 5. The coal gas water flows evenly on the upper surface of the guide plate 6 through the diversion plate 10 on the water inlet pipe 5. The alkaline solution is discharged into the interior of the tower body 2 through the diversion plate 10 on the alkali addition pipe 9 and flows evenly on the upper surface of the guide plate 6. The coal gas water is neutralized by the alkaline solution, so that the NH3-N in the coal gas water mainly exists in the state of free ammonia (NH3). The coal gas water passes through Several V-shaped grooves 13 accumulate inside the collector plate 11. When the gas-water accumulates inside several guide holes 12, it flows downward through the guide holes 12 onto the upper surface of the next guide plate 6. At this time, water vapor is introduced into the second connecting pipe 19 through the third connecting pipe 20. The water vapor is introduced into the two air inlet pipes 16 through the two first connecting pipes 18. Subsequently, the water vapor is discharged into the interior of the tower body 2 through the four first gas distribution pipes 21 and several second gas distribution pipes 17, where it is uniformly mixed with the gas-water. This causes the NH3 and CO2, H2, CO, H2S and other gases in the gas-water to be converted into gas phase, thereby removing NH3-N and CO2, H2, CO, H2S and other gases from the water. This effectively prolongs the flow time of the gas-water inside the tower body 2 and allows the water vapor to fully contact the gas-water, improving the acid and ammonia removal capacity and practicality of the device.

[0056] Furthermore, the filtration device includes a base plate 22, which is fixedly installed on the rear top position of the outer surface of the tower body 2, and a filter canister 23 is fixedly installed on the upper surface of the base plate 22. Exhaust holes 27 are evenly opened on the upper surface of the filter canister 23 away from the center.

[0057] Furthermore, the end of the exhaust pipe 4 furthest from the top of the tower 3 is inserted and fixedly installed on the upper surface of the filter tank 23, and the end of the exhaust pipe 4 furthest from the top of the tower 3 extends to the bottom inside the filter tank 23. The top right side of the outer surface of the filter tank 23 is inserted and fixedly installed with a feed pipe 24, and the bottom left side of the outer surface of the filter tank 23 is inserted and fixedly installed with a drain pipe 25. A drain valve 26 is provided on the outer surface of the end of the drain pipe 25 furthest from the filter tank 23. The ammonia gas blown out by the steam is discharged into the filter tank 23 through the exhaust pipe 4. An acidic solution is discharged into the filter tank 23 through the feed pipe 24. The ammonia gas reacts with the acidic solution and is absorbed by the acid, thus preventing the ammonia gas from entering the atmosphere with the steam and causing secondary pollution, thereby improving the environmental friendliness of the device.

[0058] Working Principle: When using this device, the coal gas-water mixture to be treated is discharged into the interior of the tower body 2 through the water inlet pipe 5. The coal gas-water mixture flows evenly onto the upper surface of the guide plate 6 through the diversion plate 10 on the water inlet pipe 5. The alkaline solution is discharged into the interior of the tower body 2 through the diversion plate 10 on the alkali addition pipe 9 and flows evenly onto the upper surface of the guide plate 6. The coal gas-water mixture is neutralized by the alkaline solution, so that the NH3-N in the coal gas-water mixture mainly exists in the state of free ammonia (NH3). The coal gas-water mixture accumulates on the inner side of the collecting plate 11 through several V-shaped grooves 13. When the coal gas-water mixture accumulates into several guide holes 12, it flows downward through several guide holes 12 onto the upper surface of the next guide plate 6. At this time, water vapor is introduced into the interior of the second connecting pipe 19 through the third connecting pipe 20. The water vapor flows through the two first connecting pipes 18 to the two gas inlet pipes. Steam is introduced into the tower body 2 through four first gas distribution pipes 21 and several second gas distribution pipes 17, where it is uniformly mixed with the gas and water. This causes the NH3, CO2, H2, CO, H2S and other gases in the gas and water to be converted into gas phase, thereby removing NH3-N and CO2, H2, CO, H2S and other gases from the water. This effectively prolongs the flow time of the gas and water inside the tower body 2 and allows the steam to fully contact the gas and water, improving the acid and ammonia removal capacity and practicality of the device. The ammonia gas stripped by steam is discharged into the filter tank 23 through the exhaust pipe 4. The filter tank 23 is then filled with an acidic solution through the feed pipe 24. The ammonia gas reacts with the acidic solution and is absorbed by the acid, preventing the ammonia gas from entering the atmosphere with the steam and causing secondary pollution, thus improving the environmental friendliness of the device.

[0059] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An acid and ammonia removal stripping tower for a coal gas-water treatment process, comprising a stripping tower base (1), characterized in that: The top of the stripping tower base (1) is fixedly installed with a tower body (2), the upper surface of the tower body (2) is fixedly installed with a tower top (3), and the upper surface of the tower top (3) is fixedly installed with an exhaust pipe (4). The tower body (2) has a water inlet pipe (5) and an alkali addition pipe (9) installed on the left and right sides of its interior, respectively. Among them, several guide plates (6) are evenly fixedly installed on the left and right sides of the tower body (2), and the several guide plates (6) on the left and right sides are arranged in an inclined and staggered manner. Among them, a collection trough (7) is fixedly installed at the bottom of the interior of the tower body (2); Among them, rectangular slots (8) are provided on the upper surface of the tower body (2) at the middle position of the longitudinal direction on both the left and right sides, and air intake devices are provided inside the two rectangular slots (8). Among them, a filter device is provided at the top rear side of the outer surface of the tower body (2); The water inlet pipe (5) and the alkali addition pipe (9) are respectively inserted and fixedly installed on the left and right sides of the top of the tower body (2), and the opposite ends of the water inlet pipe (5) and the alkali addition pipe (9) are respectively located on the upper left and upper right sides of the guide plate (6). A diversion plate (10) is fixedly installed on the opposite ends of the water inlet pipe (5) and the alkali addition pipe (9). Several of the aforementioned feed trays (6) have a flow collecting plate (11) fixedly installed on the upper surface of one end of the inner wall away from the tower body (2), and several flow guiding holes (12) are evenly opened on the upper side of the left and right surfaces of the several flow collecting plates (11). Among them, V-shaped grooves (13) are opened on the upper surface of several guide plates (6) corresponding to the positions of several guide holes (12); A discharge pipe (14) is fixedly installed at the center of the bottom end of the collection tank (7). The end of the discharge pipe (14) away from the collection tank (7) passes through the outer surface of the tower body (2), and a discharge valve (15) is provided on the outer surface of the end of the discharge pipe (14) away from the collection tank (7). The air intake device includes two air intake pipes (16). The two air intake pipes (16) are fixedly installed inside the two rectangular slots (8) at positions corresponding to several guide plates (6). The two air intake pipes (16) are also fixedly installed at positions between two adjacent guide plates (6). The ends of several second air intake pipes (17) away from the air intake pipes (16) all penetrate into the interior of the tower body (2). Among them, two first air distribution pipes (21) are inserted and fixedly installed on the opposite surfaces of the two air inlet pipes (16) at the position below the bottom guide plate (6); A drain plate (28) is fixedly installed at the bottom of the tower body (2) below the first gas distribution pipe (21), and drain holes (29) are evenly opened on the upper surface of the drain plate (28). The bottom of the outer surface of the tower body (2) is fixedly connected to the bottom of the two air inlet pipes (16). The front ends of the two first connecting pipes (18) are fixedly connected to the bottom outer surface of the two air inlet pipes (16), and the rear ends of the two first connecting pipes (18) are fixedly connected to the second connecting pipe (19). The third connecting pipe (20) is fixedly installed in the middle of the outer surface of the second connecting pipe (19).

2. The acid and ammonia removal stripping tower for coal gas-water treatment process according to claim 1, characterized in that: The filtration device includes a base plate (22), which is fixedly installed on the rear top of the outer surface of the tower body (2), and a filter canister (23) is fixedly installed on the upper surface of the base plate (22). Exhaust holes (27) are evenly opened on the upper surface of the filter canister (23) away from the center.

3. The acid and ammonia removal stripping tower for coal gas-water treatment process according to claim 2, characterized in that: The exhaust pipe (4) is inserted and fixedly installed on the upper surface of the filter tank (23) at one end away from the top of the tower (3), and the exhaust pipe (4) extends to the bottom inside of the filter tank (23) at one end away from the top of the tower (3). The feed pipe (24) is inserted and fixedly installed on the top right side of the outer surface of the filter tank (23). Among them, a drain pipe (25) is inserted and fixedly installed on the bottom left side of the outer surface of the air filter tank (23), and a drain valve (26) is provided on the outer surface of the end of the drain pipe (25) away from the air filter tank (23).

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