A urea blowdown drum off-gas treatment system

Abstract

The present application belongs to the technical field of urea tail gas treatment, and discloses a urea venting cylinder tail gas treatment system, which comprises a secondary absorption tower, a water supply pipe connected to the secondary absorption tower, a compensation device arranged on the water supply pipe, the compensation device comprising a water supply tank, a first branch water pipe and a second branch water pipe, the water supply tank being in communication with the water supply pipe, the two ends of the first branch water pipe and the second branch water pipe being respectively in communication with the water supply tank and the water supply pipe, an electromagnetic extrusion block being slidably arranged in the water supply tank, springs being arranged at the upper and lower ends of the electromagnetic extrusion block, the other ends of the two springs being respectively connected to the upper and lower ends of the water supply tank, an electromagnet being arranged on the water supply tank and being arranged in cooperation with the electromagnetic extrusion block; the present application solves the problem that the prior art cannot supply water when starting and stopping or when the system fails, and is suitable for tail gas treatment in the carbon dioxide gas body method urea production process.

Description

Technical Field

[0001] This solution belongs to the field of urea tail gas treatment technology, specifically involving a urea venting cylinder tail gas treatment system. Background Technology

[0002] Domestic urea production mainly uses ammonia as raw material, which reacts with carbon dioxide to form urea. In the carbon dioxide gas urea production process, the ammonia content in the vent pipe mainly comes from the ammonia in the inert gas emitted from the atmospheric pressure tower in the unit, as well as the ammonia contained in the volatile gas of the urea ammonia tank and urine tank. The ammonia content was tested to be approximately 0.1%.

[0003] An ammonia absorption tower with the publication number "CN217988877U" includes an absorption tower body, a filling layer in the absorption tower body, a support ring fixed on the inner wall of the absorption tower body to support the filling layer, a door panel on the side wall of the absorption tower body, one side of the door panel being hinged to the side wall of the absorption tower body, and a fixing component on the other side of the door panel, the door panel being fixed to the side wall of the absorption tower body by the fixing component.

[0004] When existing absorption towers are started up, stopped, or when the system malfunctions, the water pump may be delayed or stop working, preventing water from outside the tower from being quickly delivered into the tower. As ammonia gas that has not reacted with water inside the tower escapes from the outlet, it causes environmental pollution. Summary of the Invention

[0005] The purpose of this solution is to provide a urea venting gas treatment system to address the problem that existing absorption towers cannot supply water during start-up, shutdown, or system failure.

[0006] To achieve the above objectives, this solution provides a urea venting gas treatment system, including a two-stage absorption tower connected to a water supply pipe. The water supply pipe is equipped with a compensation device, which includes a water supply tank, a first branch pipe, and a second branch pipe. The water supply tank is connected to the water supply pipe. The two ends of the first and second branch pipes are respectively connected to the water supply tank and the water supply pipe. An electromagnetic compression block slides inside the water supply tank. Springs are connected to both ends of the electromagnetic compression block, and the other ends of the two springs are respectively connected to the upper and lower ends of the water supply tank. An electromagnet is provided on the water supply tank, and the electromagnet cooperates with the electromagnetic compression block.

[0007] The principle of this scheme is as follows: (1) In the initial state, the magnet is fixed in the middle of the water supply tank by the springs connected on the upper and lower sides. (2) When the system is started, the electromagnet coil is energized to generate an electromagnetic field, which attracts the electromagnetic squeezing block in the water supply tank, causing it to move upward, compressing the upper spring of the squeezing block and stretching the lower spring. The upward movement of the squeezing block will squeeze the water on its upper side. After being squeezed, the water will flow from the first water pipe into the water supply pipe and then into the secondary absorption tower. (3) When the system stops running or fails to power off, the electromagnet will immediately demagnetize. After losing the attraction of the electromagnet, the squeezing block releases energy by its own weight and the springs connected on the upper and lower sides. The squeezing block moves downward to squeeze the water on its lower side. The water squeezed on its lower side flows into the water supply pipe through the second water pipe and then into the secondary absorption tower.

[0008] The technical effects of this solution are as follows: (1) Compensation water supply: Through the compensation device, water can still be supplied to the absorption tower even when the system is started or stopped or when there is a power failure, preventing unreacted ammonia from escaping during this stage and thus avoiding environmental pollution. (2) Timely response: The electromagnet will be magnetized or demagnetized instantly when it is switched on and off. It works in conjunction with the electromagnetic extrusion block to quickly supply water to the pipeline by extruding water on both sides of the electromagnetic extrusion block, reducing the delay in pump start-up and thus improving the sensitivity of the system. (3) Environmental benefits: The system has water supply in all stages, effectively preventing the escape of unreacted ammonia and helping to reduce the risk of environmental pollution.

[0009] Furthermore, the inlet end of the secondary absorption tower is equipped with an ammonia emission device and a primary absorption tower. The ammonia emission device includes a urea ammonia water tank, a urea urine tank, a tail gas buffer tank, and a tail gas blower. The outlet ends of the urea ammonia water tank and the urea urine tank are both connected to the inlet end of the tail gas buffer tank. The outlet end of the tail gas buffer tank is connected to the inlet end of the tail gas blower. The outlet end of the tail gas blower is connected to the inlet end of the secondary absorption tower. The outlet end of the primary absorption tower is connected to the inlet end of the secondary absorption tower. The inlet end of the primary absorption tower is connected to an atmospheric pressure absorption tower.

[0010] The technical effects of this scheme are as follows: (1) Ammonia gas discharged from the urea ammonia water tank and urea urine tank is sent into the secondary absorption tower through the tail gas buffer tank and tail gas blower. (2) The tail gas buffer tank, as an intermediate link, can alleviate the emission of ammonia gas, so that the ammonia gas is buffered and stabilized to a certain extent before emission. (3) The tail gas blower increases the flow velocity of ammonia gas in the pipeline by providing airflow, which helps to guide the ammonia gas smoothly into the secondary absorption tower. (4) The ammonia gas discharged from the atmospheric pressure absorption tower is absorbed by the primary absorption tower and the secondary absorption tower, which improves the ammonia gas removal efficiency.

[0011] Furthermore, both the primary and secondary absorption towers are equipped with circulation devices at their outlet ends. These circulation devices include a primary absorption circulation pump, a primary absorption cooler, a secondary absorption circulation pump, and a secondary absorption cooler. The inlet of the primary absorption circulation pump is connected to the outlet of the primary absorption tower, and the outlet of the primary absorption circulation pump is connected to the inlet of the primary absorption cooler. The outlet of the primary absorption cooler is connected to the primary absorption tower. The outlet of the primary absorption circulation pump is also connected to an ammonia water tank. The inlet of the secondary absorption circulation pump is connected to the outlet of the secondary absorption tower, and the outlet of the secondary absorption circulation pump is connected to the inlet of the secondary absorption cooler. The outlet of the secondary absorption cooler is connected to the secondary absorption tower, and the outlet of the secondary absorption cooler is also connected to the inlet of the primary absorption tower.

[0012] The technical effects of this solution are as follows: (1) The primary absorption circulation pump is connected to the primary absorption tower and the primary absorption cooler, and the secondary absorption circulation pump is connected to the secondary absorption tower and the secondary absorption cooler. The circulation of the liquid is achieved by using the primary and secondary absorption circulation pumps for circulation absorption, which helps to recycle the treated liquid within the system. (2) The outlet of the secondary absorption circulation pump is also connected to the primary absorption tower; the absorbent of the primary absorption tower comes from the circulating liquid of the secondary absorption tower, realizing the feedback of the circulating liquid of the secondary absorption tower to the primary absorption tower, reducing the waste of the circulating liquid. (3) The outlet of the primary absorption circulation pump is also connected to an ammonia water tank; the absorbent of the primary absorption tower is discharged to the ammonia water tank, which helps to collect ammonia water in a centralized manner.

[0013] Furthermore, the water supply tank is connected to a water storage pipe, and the water storage pipe is connected to the water storage tank.

[0014] The technical advantage of this solution is that the water storage tank supplies water to the water supply tank by transporting water from the storage pipe to the water supply tank.

[0015] Furthermore, the liquid in the water supply pipe, water supply tank, and water storage tank is all demineralized water.

[0016] The technical advantages of this solution are: (1) The demineralized water contains almost no salt, which can reduce corrosion of pipes and equipment. (2) The demineralized water does not contain a large amount of dissolved substances, and the use of demineralized water can react more effectively with ammonia water, which is beneficial to improving the absorption effect of ammonia in the absorption tower.

[0017] Furthermore, the first and second water pipes are arranged alternately.

[0018] The technical benefits of this solution are: it helps optimize water flow within the pipe and reduces the impact of water flow.

[0019] Furthermore, one-way valves are provided at the connection points of the water storage pipe and the water supply tank, the connection points of the first and second branch water pipes and the water supply pipe, and the connection points of the water supply pipe and the water supply tank.

[0020] The technical effect of this solution is that the one-way valve prevents liquid backflow and ensures that the water flow in each pipe always moves in the preset direction.

[0021] Furthermore, the water supply tank is equipped with a buffer device, which includes a buffer chamber, a rubber stopper, a movable rod, and a buffer spring. The buffer chamber is connected to the water supply tank, the rubber stopper slides inside the buffer chamber, the movable rod is fixedly connected to the rubber stopper, a portion of the movable rod is located outside the buffer chamber, and the buffer spring passes through the movable rod, with both ends abutting against the rubber stopper and the inner wall of the buffer chamber, respectively.

[0022] The technical effect of this solution is that when the electromagnet is de-energized, the electromagnetic squeezing block will squeeze the water on the lower end face. Some of the water will squeeze the rubber stopper to compress the buffer spring and flow into the buffer chamber, so as to reduce the impact of the squeezing block on the water on the lower side and reduce the water flow rate.

[0023] Furthermore, a cleaning device is provided on one side of the buffer device. The cleaning device includes a gas tank and a valve. The valve is connected to the gas outlet of the gas tank. The valve is connected to a gas pipe, which is connected to the gas inlet of the secondary absorption tower. The valve's switch handle has a limit groove. The movable rod is threaded with a bolt, which is slidably connected to the limit groove.

[0024] The technical effects of this solution are as follows: (1) When the rubber stopper moves, it drives the movable rod to move in the same direction. The movable rod drives the bolt to slide in the limiting groove, thereby turning the valve switch handle, opening the valve, connecting the gas tank and the gas pipe, releasing the gas in the tank, and the gas flows through the gas pipe to the inlet end of the secondary absorption tower to clean the ammonia in the inlet pipe of the secondary absorption tower. (2) When the electromagnet is energized, the electromagnetic compression block resets. After the rubber stopper loses the external force, the compressed buffer spring resets and drives the rubber stopper and the movable rod to reset. The movable rod drives the bolt to slide in the limiting groove in the opposite direction, thereby turning the valve in the opposite direction to reset it and cutting off the passage between the gas tank and the gas pipe.

[0025] Furthermore, a check valve is provided at the connection between the gas pipe and the gas inlet of the secondary absorption tower, and the gas in the gas tank is nitrogen.

[0026] The technical effects of this solution are: (1) The check valve is used to prevent ammonia from entering the gas pipe. (2) By reacting nitrogen with ammonia, ammonia can be diluted and its concentration reduced. Attached Figure Description

[0027] Figure 1This is a schematic diagram of the process of a urea venting cylinder tail gas treatment system according to the present invention;

[0028] Figure 2 This is a schematic diagram of the tail gas treatment system for a urea venting cylinder according to the present invention;

[0029] Figure 3 This is a schematic diagram of the compensation device and the secondary absorption tower of the present invention;

[0030] Figure 4 This is a cross-sectional view of the compensation device, buffer device, and cleaning device of the present invention.

[0031] In the diagram: 1. Secondary absorption tower; 2. Water supply pipe; 31. Water supply tank; 32. First branch water pipe; 33. Second branch water pipe; 34. Electromagnetic extrusion block; 35. Spring; 36. Electromagnet; 37. Water storage pipe; 38. Water storage tank; 39. One-way valve; 41. Urea ammonia water tank; 42. Urea urine tank; 43. Tail gas buffer tank; 44. Tail gas blower; 5. Primary absorption tower; 6. Atmospheric pressure absorption tower; 71. Primary absorption circulation pump; 72. Primary absorption cooler; 73. Secondary absorption circulation pump; 74. Secondary absorption cooler; 8. Ammonia water tank; 91. Buffer chamber; 92. Rubber stopper; 93. Movable rod; 931. Bolt; 94. Buffer spring; 101. Gas tank; 102. Valve; 1021. Limiting groove; 103. Gas pipe; 104. Check valve. Detailed Implementation

[0032] The following detailed explanation illustrates the specific implementation methods:

[0033] Example:

[0034] like Figure 2 As shown, a urea venting system for treating exhaust gas includes a secondary absorption tower 1. The inlet of the secondary absorption tower 1 is equipped with an ammonia emission device 4 and a primary absorption tower 5. The ammonia emission device 4 includes a urea ammonia water tank 41, a urea urine liquid tank 42, an exhaust gas buffer tank 43, and an exhaust gas blower 44. The outlets of the urea ammonia water tank 41 and the urea urine liquid tank 42 are both connected to the inlet of the exhaust gas buffer tank 43. The outlet of the exhaust gas buffer tank 43 is connected to the inlet of the exhaust gas blower 44. The outlet of the blower 44 is connected to the inlet of the secondary absorption tower 1, and the outlet of the primary absorption tower 5 is connected to the inlet of the secondary absorption tower 1. The inlet of the primary absorption tower 5 is connected to the atmospheric pressure absorption tower 6. With the above configuration, the ammonia gas discharged from the urea ammonia water tank 41 and the urea urine tank 42 enters the secondary absorption tower through the tail gas buffer tank 43 and the tail gas blower 44. The ammonia gas discharged from the atmospheric pressure absorption tower 6 is absorbed by the primary absorption tower 5 and the secondary absorption tower 1 in two stages to increase the ammonia removal effect.

[0035] Both the primary absorption tower 5 and the secondary absorption tower 1 are equipped with circulation devices 7 at their outlet ends. Circulation devices 7 include a primary absorption circulation pump 71, a primary absorption cooler 72, a secondary absorption circulation pump 73, and a secondary absorption cooler 74. The inlet end of the primary absorption circulation pump 71 is connected to the outlet end of the primary absorption tower 5, and the outlet end of the primary absorption circulation pump 71 is connected to the inlet end of the primary absorption cooler 72. The outlet end of the primary absorption cooler 72 is connected to the primary absorption tower 5. The outlet end of the primary absorption circulation pump 71 is also connected to an ammonia water tank 8. The inlet end of the secondary absorption circulation pump 73 is connected to the outlet end of the secondary absorption tower 1. The outlet of the primary absorption circulation pump 73 is connected to the inlet of the secondary absorption cooler 74, the outlet of the secondary absorption cooler 74 is connected to the secondary absorption tower 1, and the outlet of the secondary absorption cooler 74 is also connected to the inlet of the primary absorption tower 5. Through the above arrangement, the liquid is circulated by the primary absorption circulation pump 71 and the secondary absorption circulation pump 73. The outlet of the secondary absorption circulation pump 73 is also connected to the primary absorption tower 5. The absorbent in the primary absorption tower 5 comes from the circulating liquid in the secondary absorption tower 1, so the circulating liquid in the secondary absorption tower 1 is fed back to the primary absorption tower, reducing the waste of circulating liquid.

[0036] like Figures 3-4 As shown, the secondary absorption tower 1 is connected to a water supply pipe 2. The water supply pipe 2 is equipped with a compensation device 3 for power outages or starting / stopping the water supply. The compensation device 3 includes a water supply tank 31, a first branch pipe 32, and a second branch pipe 33 arranged in an alternating pattern. The water supply tank 31 is connected to the water supply pipe 2. The two ends of the first branch pipe 32 and the second branch pipe 33 are respectively connected to the water supply tank 31 and the water supply pipe 2. The water supply tank 31 is connected to a storage pipe 37, which is connected to a storage tank 38. The liquids in the water supply pipe 2, the water supply tank 31, and the storage tank 38 are all demineralized water. One-way valves 39 are installed at the connections of the storage pipe 37 and the water supply tank 31, the first branch pipe 32 and the second branch pipe 33 and the water supply pipe 2, and the water supply pipe 2 and the water supply tank 31. The water supply tank 31... A piston 34 slides internally, and a magnet is installed inside the piston 34. Springs 35 are connected to both the upper and lower ends of the piston 34. The other ends of the two springs 35 are connected to the upper and lower ends of the water supply tank 31, respectively. An electromagnet 36 is installed on the water supply tank 31, and the electromagnet 36 is configured to cooperate with the piston 34. Through the above configuration, when the system starts or stops, or when there is a power failure, the electromagnet 36 attracts or resets the piston 34 by generating or demagnetizing it, so that it compresses the water on both sides of the piston 34, thereby supplying water to the secondary absorption tower 1 and preventing unreacted ammonia gas in the tower from escaping at this stage. When the electromagnet 36 is energized or demagnetized momentarily by switching the power on and off, it cooperates with the piston 34 to quickly supply water to the secondary absorption tower 1 by squeezing the water on both sides of the piston 34, avoiding delays in pump start-up.

[0037] The water supply tank 31 is equipped with a buffer device 9, which includes a buffer chamber 91, a rubber stopper 92, a movable rod 93, and a buffer spring 94. The buffer chamber 91 is connected to the water supply tank 31. The rubber stopper 92 slides inside the buffer chamber 91. The movable rod 93 is fixedly connected to the rubber stopper 92. A part of the movable rod 93 is located outside the buffer chamber 91. The movable rod 93 located outside the buffer chamber 91 is connected to a bolt 931 by a thread. The buffer spring 94 passes through the movable rod 93, and its two ends abut against the rubber stopper 92 and the inner wall of the buffer chamber 91, respectively. With the above arrangement, when the electromagnet 36 is de-energized, the piston 34 will squeeze the water on the lower end face. A part of the water will squeeze the rubber stopper 92 and compress the buffer spring 94, and flow into the buffer chamber 91 to reduce the impact of the piston 34 on the water below and reduce the water flow rate.

[0038] A cleaning device 10 is provided on one side of the buffer device 9. The cleaning device 10 includes a gas tank 101 and a valve 102. The valve 102 is connected to the gas outlet of the gas tank 101. The gas in the gas tank 101 is nitrogen. The valve 102 is connected to a gas pipe 103, which is connected to the gas inlet of the secondary absorption tower 1. A check valve 104 is provided at the connection between the gas pipe 103 and the gas inlet of the secondary absorption tower 1. The switch handle of the valve 102 has a limit groove 1021, and the bolt 931 is slidably connected to the limit groove 1021. With the above setup, when the electromagnet 36 is de-energized and demagnetized, the piston 34 squeezes the water on the lower side. A portion of the water pushes the rubber stopper 92 to move. The rubber stopper 92 drives the movable rod 93 to move in the same direction. The movable rod 93 drives the bolt 931 to slide in the limiting groove 1021, thereby turning the switch handle of the valve 102, opening the valve 102, connecting the gas pipe 103 and the gas tank 101, and introducing the nitrogen gas in the gas tank 101 into the inlet end of the secondary absorption tower 1 through the gas pipe 103 to clean the ammonia gas in the inlet pipe of the secondary absorption tower 1.

[0039] The specific implementation method is as follows:

[0040] (1) In the initial state, the system is not powered on, and the piston 34 is fixed in the middle of the water supply tank 31 by the springs connected on the upper and lower sides. At this time, the water supply pipe 2 is empty. The water in the water supply tank 31 comes from the supply of the water supply tank 38. (2) When the system is powered on, the electromagnet 36 generates a magnetic field after the coil is powered on, which attracts the piston 34 in the water supply tank 31, causing it to move upward, compressing the spring 35 on the upper side of the compression block, and stretching the spring 36 on the lower side. The upward movement of the piston 34 will squeeze the water on the upper side. After being squeezed, the water flows from the first water pipe 32 into the water supply pipe 2, and then into the secondary absorption tower 1. This achieves the effect of delayed water pump start-up when the system is started, timely response to supply water to the absorption tower, and prevention of ammonia escape during this stage. (3) When the system stops running or the power is cut off, the electromagnet 36 will be demagnetized immediately. After the piston 34 loses the attraction of the electromagnet 36, it releases energy by its own weight and the springs 35 connected on the upper and lower sides, causing the piston 34 to move downward and squeeze the water on the lower side of the piston 34. Part of the squeezed water will flow into the water supply pipe 2 through the second water pipe 33 and then into the secondary absorption tower 1. The other part of the water will push the rubber stopper 92 to the right. The rubber stopper 92 moving to the right will drive the movable rod 93 to move in the same direction and compress the buffer spring 94. The movable rod 93 will drive the bolt 931 to move in the same direction in the limit groove 1021, causing the switch handle of the valve 102 to turn to the right and open the valve 102. The nitrogen in the gas pipe 101 will enter the gas inlet of the secondary absorption tower 1 through the gas pipe 103. (4) When the electromagnet 36 is energized, the piston 34 is reset, the compressed buffer spring 94 is reset, and the rubber plug 92 and the movable rod 93 move in the opposite direction to reset. The movable rod 93 drives the bolt to slide in the opposite direction in the limit groove 1021, and the switch handle of the valve 102 rotates in the opposite direction to close the valve 102 and cut off the passage between the air pipe 103 and the air tank 101.

[0041] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A urea venting stack tail gas treatment system, comprising a secondary absorption tower (1), wherein the secondary absorption tower (1) is connected to a water supply pipe (2), characterized in that: The water supply pipe (2) is provided with a compensation device (3). The compensation device (3) includes a water supply tank (31), a first branch water pipe (32) and a second branch water pipe (33). The water supply tank (31) is connected to the water supply pipe (2). The two ends of the first branch water pipe (32) and the second branch water pipe (33) are respectively connected to the water supply tank (31) and the water supply pipe (2). An electromagnetic extrusion block (34) slides inside the water supply tank (31). The upper and lower ends of the electromagnetic extrusion block (34) are connected to springs (35). The other ends of the two springs (35) are respectively connected to the upper and lower ends of the water supply tank (31). An electromagnet (36) is provided on the water supply tank (31). The electromagnet (36) is configured in cooperation with the electromagnetic extrusion block (34).

2. The urea venting stack exhaust gas treatment system according to claim 1, characterized in that: The inlet of the secondary absorption tower (1) is equipped with an ammonia emission device (4) and a primary absorption tower (5). The ammonia emission device (4) includes a urea ammonia water tank (41), a urea urine tank (42), a tail gas buffer tank (43), and a tail gas blower (44). The outlets of the urea ammonia water tank (41) and the urea urine tank (42) are connected to the inlet of the tail gas buffer tank (43). The outlet of the tail gas buffer tank (43) is connected to the inlet of the tail gas blower (44). The outlet of the tail gas blower (44) is connected to the inlet of the secondary absorption tower (1). The outlet of the primary absorption tower (5) is connected to the inlet of the secondary absorption tower (1). The inlet of the primary absorption tower (5) is connected to an atmospheric pressure absorption tower (6).

3. The urea venting stack exhaust gas treatment system according to claim 2, characterized in that: Both the primary absorption tower (5) and the secondary absorption tower (1) are equipped with circulation devices (7) at their liquid outlets. The circulation devices (7) include a primary absorption circulation pump (71), a primary absorption cooler (72), a secondary absorption circulation pump (73), and a secondary absorption cooler (74). The liquid inlet of the primary absorption circulation pump (71) is connected to the liquid outlet of the primary absorption tower (5), and the liquid outlet of the primary absorption circulation pump (71) is connected to the liquid inlet of the primary absorption cooler (72). The liquid outlet of the first-stage absorption circulation pump (71) is connected to the first-stage absorption tower (5). The liquid outlet of the first-stage absorption circulation pump (71) is also connected to the ammonia water tank (8). The liquid inlet of the second-stage absorption circulation pump (73) is connected to the liquid outlet of the second-stage absorption tower (1). The liquid outlet of the second-stage absorption circulation pump (73) is connected to the liquid inlet of the second-stage absorption cooler (74). The liquid outlet of the second-stage absorption cooler (74) is connected to the second-stage absorption tower (1). The liquid outlet of the second-stage absorption cooler (74) is also connected to the liquid inlet of the first-stage absorption tower (5).

4. The urea venting stack exhaust gas treatment system according to claim 1, characterized in that: The water supply tank (31) is connected to a water storage pipe (37), and the water storage pipe (37) is connected to a water storage tank (38).

5. The urea venting stack exhaust gas treatment system according to claim 4, characterized in that: The liquids in the water supply pipe (2), water supply tank (31) and water storage tank (38) are all desalinated water.

6. The urea venting stack exhaust gas treatment system according to claim 1, characterized in that: The first branch water pipe (32) and the second branch water pipe (33) are arranged alternately.

7. The urea venting stack exhaust gas treatment system according to claim 4, characterized in that: One-way valves (39) are provided at the connection between the water storage pipe (37) and the water supply tank (31), the connection between the first branch pipe (32) and the second branch pipe (33) and the water supply pipe (2), and the connection between the water supply pipe (2) and the water supply tank (31).

8. The urea venting stack exhaust gas treatment system according to claim 1, characterized in that: The water supply tank (31) is equipped with a buffer device (9), which includes a buffer chamber (91), a rubber stopper (92), a movable rod (93), and a buffer spring (94). The buffer chamber (91) is connected to the water supply tank (31). The rubber stopper (92) slides in the buffer chamber (91). The movable rod (93) is fixedly connected to the rubber stopper (92). A part of the movable rod (93) is located outside the buffer chamber (91). The buffer spring (94) passes through the movable rod (93) and its two ends abut against the inner wall of the rubber stopper (92) and the buffer chamber (91), respectively.

9. The urea venting stack exhaust gas treatment system according to claim 8, characterized in that: A cleaning device (10) is provided on one side of the buffer device (9). The cleaning device (10) includes a gas tank (101) and a valve (102). The valve (102) is connected to the gas outlet of the gas tank (101). The valve (102) is connected to a gas pipe (103). The gas pipe (103) is connected to the gas inlet of the secondary absorption tower (1). The switch handle of the valve (102) has a limit groove (1021). The movable rod (93) is threaded with a bolt (931). The bolt (931) is slidably connected to the limit groove (1021).

10. A urea venting stack exhaust gas treatment system according to claim 9, characterized in that: A check valve (104) is provided at the connection between the gas pipe (103) and the gas inlet of the secondary absorption tower (1), and the gas in the gas tank (101) is nitrogen.

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