Ammonia recovery device capable of achieving ventilation

Abstract

An ammonia recovery device capable of achieving ventilation comprises a water container and a ventilation mechanism; the water container is provided with a level gauge, a drain valve, a density meter, an exhaust outlet and a water supply valve; the ventilation mechanism is provided with two sets of check systems, the purpose of the first check system is to allow the ammonia exhaust gas to enter the water container normally and ensure that the solution in the container is not sucked back into the reactor, and the second check system is to allow air to enter the reactor and ensure that the ammonia exhaust gas is not discharged. When the ammonia exhaust gas generated by the reactor enters the water container, the ammonia gas is absorbed by water and becomes ammonia water, and the saturated ammonia water is discharged to the ammonia water storage tank through the drain valve at the bottom of the container for recycling. When the reactor is discharged, negative pressure begins to be generated in the reactor, and air enters the reactor through the second set of check systems to ensure that the reactor is at normal pressure and discharged normally. Therefore, the present invention solves the problem of ammonia water back-sucking in the reactor while solving the recycling of ammonia gas.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery precursor material processing equipment, and in particular to an ammonia recovery device capable of achieving ventilation. Background Art

[0002] With the continuous development of the digital product industry, people's demand for batteries is increasing. Nickel, cobalt and manganese are an important lithium battery precursor material, and their production and use are becoming more and more extensive. The market demand is large. A large amount of ammonia-containing tail gas is generated during the production reaction stage of the reactor. Conventional ammonia recovery can achieve the purpose of ammonia absorption. In the process of realizing the present invention, the inventor found that in the prior art, during the conventional ammonia recovery process, the negative pressure generated when the reactor is discharged will cause ammonia backflow. If the internal pressure compensation of the reactor is not performed in time, the material in the reactor will not be able to be discharged smoothly from the discharge port.

[0003] In view of this, how to solve the above technical deficiencies, to achieve ammonia absorption and solve the ammonia backflow, and to perform pressure compensation at any time, has become the subject to be studied and solved by the present invention. Summary of the invention

[0004] The present invention provides an ammonia recovery device capable of achieving ventilation, the purpose of which is to solve the problem of recycling ammonia in ammonia tail gas of a reactor and to solve the problem of air intake ventilation for pressure compensation when discharging materials from the reactor.

[0005] To achieve the above-mentioned purpose, the present invention proposes an ammonia recovery device capable of achieving ventilation, which is set for a reactor. The innovation point is that the ammonia recovery device comprises a water container and a ventilation mechanism; wherein:

[0006] The water container is a container for ammonia water, and is provided with an exhaust gas outlet, a water supply valve, a density meter, a liquid level meter and a drain valve;

[0007] The tail gas outlet and the water replenishment valve are both arranged at the top of the water container, the density meter is arranged at a position below the liquid level of the water container, the liquid level meter matches the high and low liquid levels of the water container, the drain valve is arranged at the bottom of the water container, and the outlet of the drain valve is connected to the ammonia storage tank;

[0008] The ventilation mechanism is a mechanism with a ventilation pipe for ventilation between the reactor, the water container and the external atmosphere. The ventilation pipe has a first connection port connected to the reactor, a second connection port selectively connected to the water container and a third connection port selectively connected to the external atmosphere. The ventilation pipe is provided with a first check system and a second check system; wherein,

[0009] The first non-return system is arranged near the third connection port, and comprises a leather ring, a connecting rod, and an air filter. The leather ring is arranged for the ventilation duct, and the leather ring has an outer contact surface, and the outer contact surface of the leather ring matches the inner wall of the ventilation duct. The leather ring is connected by the connecting rod and fixed in the ventilation duct, and the air filter is fixed to the ventilation duct and communicates with the external atmosphere.

[0010] The second check system is arranged near the second connection port, and the second check system includes a positioning ring, a base, a valve ball and a limit ring. The positioning ring is positioned and installed in the ventilation duct, and the base is fixed to the ventilation duct by the positioning ring. The base is provided with an abutment surface matching the spherical surface of the valve ball. The limit ring is arranged at a position of the ventilation duct near the second connection port for the valve ball, and the limit ring is located above the base and is positioned by the base.

[0011] The relevant contents of the present invention are explained as follows:

[0012] 1. In the above scheme, the water replenishing valve replenishes water according to the actual liquid level of the water container, and the liquid level is measured by the liquid level meter. The water replenishing valve is interlocked with the liquid level meter and automatically replenishes to the set liquid level according to the liquid level data; the density meter monitors the density of the solution in the water container and determines whether the solution is saturated by the density. The density meter is interlocked with the drain valve. When the density meter detects that the solution is saturated, the drain valve automatically opens to discharge the saturated ammonia water into the ammonia water tank; the ammonia tail gas in the reactor enters the ventilation mechanism through the connecting pipe, and the ammonia tail gas pushes the valve ball upward and enters the water container. The ammonia in the ammonia tail gas is absorbed by water, and other tail gases that are insoluble in water are discharged into the atmosphere through the tail gas outlet; the leather ring is tightly matched with the inner wall of the ventilation mechanism cylinder, and the ammonia tail gas enters After the ventilation mechanism, under the action of the positive pressure of the ammonia tail gas, the leather ring is pressed to expand outward and fits tightly with the wall of the ventilation mechanism, so as to prevent the ammonia tail gas from passing through; when the reactor is discharged, negative pressure is generated in the reactor, the connecting pipe and the ventilation mechanism, and the surface of the valve ball is in close contact with the abutment surface under the action of its own weight and negative pressure, so as to prevent the solution in the water container from being sucked back; the negative pressure generated by the discharge of the reactor causes the leather ring to shrink, and a gap is generated between the leather ring and the wall of the ventilation mechanism, and air enters the reactor through the connecting pipe for pressure compensation, so as to achieve the purpose of smoothly discharging the reactor; before the external air enters the reactor, it is first filtered through the air filter, so as to achieve the purpose of evolving air and preventing solid particles and foreign matter from entering the reactor.

[0013] 2. In the above scheme, the abutting surface of the base is an arc surface in contact with the valve ball surface or an annular surface in linear contact with the valve ball, which can be tightly matched with the valve ball surface to form a closed state. The present invention does not limit the shape of the abutting surface.

[0014] 3. In the above scheme, the inner wall of the ventilation duct has a contact surface with the leather ring, and the roughness of the contact surface is required to be Ra1.6 or above, so as to ensure that under the positive pressure of the ammonia tail gas, the leather ring is pressed to expand outward and fit tightly with the wall of the ventilation mechanism cylinder, so as to achieve a better sealing effect.

[0015] 4. In the above scheme, the valve ball is made of Teflon material, and the surface finish of the valve ball is Ra1.6 or above; the base is made of Teflon material, and the abutting surface of the base has the same roundness as the valve ball, and the abutting surface finish of the base is Ra1.6 or above; Teflon material is used to prevent the valve ball, base and other components from being corroded by ammonia, thereby improving the service life and reliability of the second check system and ensuring that the sealing effect can be maintained for a long time.

[0016] 5. In the above solution, the leather ring is preferably made of natural rubber with good resilience and wear resistance, so that the leather ring can withstand frequent deformation when the ammonia tail gas is at positive or negative pressure, which can also increase its service life and reliability.

[0017] 6. In the above solution, the connection method between the leather ring and the connecting rod is bolt connection or fixed connection, which can make the leather ring completely fixed and prevent air leakage at the connection to form a closed state. The present invention does not limit the connection method.

[0018] 7. In the above solution, the liquid level gauge is a flap level gauge, a radar level gauge or a static pressure level gauge, which only monitors the liquid level of the water container. The present invention does not limit the type of the liquid level gauge.

[0019] 8. In the above solution, the water supply valve is preferably equipped with a pneumatic ball valve with feedback signal, and the water supply valve is connected to the liquid level meter electrical signal to achieve the purpose of automatically replenishing water to the set liquid level.

[0020] 9. In the above scheme, the drain valve is preferably equipped with a pneumatic ball valve with feedback signal, and the drain valve is connected with the density meter to achieve the purpose of automatically discharging saturated ammonia water.

[0021] 10. In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] 11. In the present invention, the orientation or position relationship indicated by the terms "center", "upper", "lower", "axial", "bottom", "inner", "outer", etc. is based on the orientation or position assembly relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0023] 12. In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0024] The working principle and advantages of the present invention are as follows:

[0025] The present invention arranges a first check system and a second check system on the ventilation pipe. The first check system and the second check system adopt a valve ball and a leather ring combination. When the ammonia tail gas in the reactor continuously accumulates and reaches a certain pressure, the valve ball is pushed upward, and the ammonia tail gas enters the water container. At the same time, under the action of the positive pressure of the ammonia tail gas, the leather ring is more closely in contact with the inner wall of the ventilation pipe to prevent the ammonia tail gas from overflowing. After the ammonia tail gas enters the water container, the ammonia gas is absorbed by the water, and other tail gases that are insoluble in water are discharged into the atmosphere through the tail gas discharge port. When the reactor is discharged, the volume of the gas phase in the reactor increases, resulting in negative pressure inside the reactor. Under the action of its own weight and negative pressure, the surface of the valve ball is in close contact with the abutment surface of the base, preventing the ammonia water in the water container from being sucked back into the reactor. However, the leather ring will shrink under the action of negative pressure, and a gap will be generated between the leather ring and the inner wall of the ventilation duct. Air enters the reactor through the air filter, compensating for the negative pressure, and allowing the material in the reactor to be discharged smoothly from the discharge port. The air filter intercepts solid particles and foreign matter entering the air. Thus designed, the present invention solves the problem of recycling ammonia in ammonia tail gas, and also solves the problem of air compensation required for negative pressure of the reactor at any time, and also solves the problem of ammonia back-inhalation during negative pressure ventilation and air intake of the reactor. This device can automatically realize ammonia absorption and negative pressure ventilation and air intake in the reactor tail gas according to the working conditions, without manual operation, which greatly reduces the labor intensity of workers, improves production efficiency, and further enhances the advanced nature; and the structures adopted by the first check system and the second check system in the ventilation mechanism are both purely mechanical structures, which cleverly utilize gravity, air pressure and the physical properties between materials to achieve complete functions, and do not need to use electronic equipment, thereby improving reliability and reducing costs, which is also conducive to the promotion and application of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Attached Figure 1 This is a schematic diagram of the actual application of an ammonia recovery device capable of achieving ventilation according to an embodiment of the present invention;

[0027] Attached Figure 2 This is a schematic structural diagram of an ammonia recovery device capable of achieving ventilation according to an embodiment of the present invention;

[0028] Attached Figure 3 It is a schematic diagram of a second check system in an ammonia recovery device capable of achieving ventilation according to an embodiment of the present invention;

[0029] Attached Figure 4 This is a schematic diagram of a base in an ammonia recovery device capable of achieving ventilation according to an embodiment of the present invention;

[0030] Attached Figure 5 This is a schematic diagram of a first check system in an ammonia recovery device capable of achieving ventilation according to an embodiment of the present invention.

[0031] The various parts of the above drawings are shown as follows:

[0032] 1. Water container; 11. Exhaust outlet; 12. Water supply valve; 13. Density meter; 14. Liquid level meter; 15. Drain valve;

[0033] 2. Ventilation mechanism;

[0034] 21. ventilation duct; 211. first connection port; 212. second connection port; 213. third connection port;

[0035] 22. First non-return system; 221. Leather ring; 222. Connecting rod; 223. Air filter;

[0036] 23. Second check system; 231. Positioning ring; 232. Base; 2321. Abutment surface; 233. Valve ball; 234. Limiting ring;

[0037] 3. Reactor; 31. Discharge port;

[0038] 4. Ammonia storage tank

[0039] 5. Connecting pipe. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0041] As attached Figure 1 and attached Figure 2 As shown, an ammonia recovery device capable of achieving ventilation is provided, the device is arranged for a reactor 3, a discharge port 31 is arranged at the bottom of the reactor 3, and the ammonia recovery device comprises a water container 1 and a ventilation mechanism 2; wherein:

[0042] The water container 1 is a container for ammonia water, and is provided with an exhaust gas outlet 11, a water supply valve 12, a density meter 13, a liquid level meter 14 and a drain valve 15;

[0043] The tail gas outlet 11 and the water supply valve 12 are both arranged at the top of the water container 1, the density meter 13 is arranged at a position below the liquid level of the water container 1, the liquid level meter 14 matches the high and low liquid levels of the water container 1, and the drain valve 15 is arranged at the bottom of the water container 1, and the outlet of the drain valve 15 is connected to the ammonia storage tank 4;

[0044] The ventilation mechanism 2 is a mechanism having a ventilation pipe 21 for ventilation between the reaction kettle 3, the water container 1 and the external atmosphere. The ventilation pipe 21 has a first connection port 211 connected to the reaction kettle 3, a second connection port 212 selectively connected to the water container 1 and a third connection port 213 selectively connected to the external atmosphere. The ventilation pipe 21 is provided with a first check system 22 and a second check system 23.

[0045] The first non-return system 22 is arranged near the third connection port 213, and comprises a leather ring 221, a connecting rod 222, and an air filter 223. The leather ring 221 is arranged for the ventilation duct 21, and the leather ring 221 has an outer contact surface, and the outer contact surface of the leather ring 221 matches the inner wall of the ventilation duct 21. The leather ring 221 is connected and fixed in the ventilation duct 21 by the connecting rod 222, and the air filter 223 is fixed to the ventilation duct 21 and communicates with the external atmosphere.

[0046] The second check system 23 is arranged near the second connection port 212, and the second check system 23 includes a positioning ring 231, a base 232, a valve ball 233 and a limiting ring 234. The positioning ring 231 is positioned and installed in the ventilation duct 21, and the base 232 is fixed to the ventilation duct 21 by the positioning ring 231. The base 232 is provided with an abutment surface 2321 matching the spherical surface of the valve ball 233. The limiting ring 234 is arranged at a position of the ventilation duct 21 near the second connection port 212 for the valve ball 233. The limiting ring 234 is located above the base 232 and is positioned by the base 232.

[0047] In the above embodiment, the water container 1 is provided with a water replenishment valve 12, an exhaust gas outlet 11, a liquid level meter 14, a density meter 13 and a drain valve 15. The liquid level meter 14 monitors the liquid level in the water container 1, and water is added through the water replenishment valve 12 to make the liquid level of the water container 1 at a suitable position; the density meter 13 monitors the density of the solution and determines whether the ammonia water in the solution is saturated, and the saturated ammonia water is transported to the ammonia water tank through the drain valve 15 for reuse.

[0048] In the ventilation mechanism 2 of the above embodiment, when the ammonia tail gas needs to enter the water container 1, under the action of positive pressure, the valve ball 233 moves upward, and the ammonia tail gas enters the water container 1. The limit ring 234 limits the highest position of the valve ball 233. At the same time, under the action of positive pressure, the leather ring 221 is in close contact with the cylinder wall of the ventilation mechanism 2 to prevent the ammonia tail gas from passing through. The ammonia tail gas all enters the water container 1, the ammonia gas is absorbed by water, and the water-insoluble tail gas is discharged to the atmosphere through the tail gas outlet 11. When negative pressure is generated during discharge of the reactor 3, the surface of the valve ball 233 is in close contact with the abutting surface 2321 of the base 232 under the action of its own weight and negative pressure, thereby preventing the ammonia water in the water container 1 from being sucked back into the reactor 3. At the same time, the leather ring 221 shrinks under the action of negative pressure, thereby generating a gap between the rubber ring 221 and the cylinder wall of the ventilation mechanism 2. Air enters the reactor 3 through the air filter 223, thereby compensating for the negative pressure in the reactor 3 and achieving the purpose of smoothly discharging the reactor 3.

[0049] The functions and principles of each component in the present invention are described in detail below:

[0050] The liquid level meter 14 monitors the liquid level in the water container 1, and adds water through the water replenishment valve 12 to make the liquid level of the water container 1 at a suitable position; the densitometer 13 monitors the density of the solution and determines whether the ammonia water in the solution is saturated, and determines whether the solution is saturated by the density. When the solution is close to saturation, it is discharged to the ammonia water storage tank 4 required for production through the drain valve 15 for recycling;

[0051] The ammonia tail gas in the reactor 3 enters the ventilation mechanism 2 through the connecting pipe 5, and the ammonia tail gas pushes the valve ball 233 upward to enter the water container 1. The ammonia in the ammonia tail gas is absorbed by the water, and other tail gas insoluble in water is discharged into the atmosphere through the tail gas outlet 11.

[0052] The leather ring 221 is closely matched with the inner wall of the ventilation mechanism 2. After the ammonia tail gas enters the ventilation mechanism 2, the leather ring 221 is pressed and expanded outwards under the positive pressure of the ammonia tail gas, and is closely fitted with the wall of the ventilation pipe 21, so as to prevent the ammonia tail gas from passing through.

[0053] When the reactor 3 is discharged, negative pressure is generated in the reactor 3, the connecting pipe 5 and the ventilation mechanism 2. Under the action of the deadweight and negative pressure, the surface of the valve ball 233 is in close contact with the abutment surface 2321, thereby preventing the solution in the water container 1 from being sucked back.

[0054] The negative pressure generated by the discharge of the reactor 3 causes the leather ring 221 to contract, and a gap is generated between the leather ring 221 and the wall of the ventilation pipe 21. Air enters the reactor 3 through the connecting pipe 5 to perform pressure compensation, thereby achieving the purpose of smoothly discharging the reactor 3.

[0055] Before the external air enters the reactor 3 , it is first filtered through the air filter 223 to achieve the purpose of purifying the air and preventing solid particles and foreign matter from entering the reactor 3 .

[0056] In an embodiment of the present invention, the abutting surface 2321 of the base 232 is an arc surface in surface contact with the valve ball 233 or an annular surface in line contact with the valve ball 233, and it only needs to fit tightly with the surface of the valve ball 233 to form a closed state. The present invention does not limit the shape of the abutting surface 2321.

[0057] In the embodiment of the present invention, the inner wall of the ventilation pipe 21 has a contact surface in contact with the leather ring 221, and the roughness of the contact surface is required to be Ra1.6 or above, so as to ensure that under the positive pressure of the ammonia tail gas, the leather ring 221 is pressed and expanded outward, and fits tightly with the cylinder wall of the ventilation mechanism 2, so as to achieve a better sealing effect. The valve ball 233 is made of Teflon material, and the surface finish of the valve ball 233 is Ra1.6 or above; the base 232 is made of Teflon material, and the abutting surface 2321 of the base 232 has the same roundness as the valve ball 233, and the abutting surface 2321 of the base 232 has a surface finish of Ra1.6 or above; the use of Teflon material is to prevent the valve ball 233, the base 232 and other components from being corroded by ammonia, so as to improve the service life and reliability of the second check system 23, and ensure that the sealing effect can be maintained for a long time. The leather ring 221 is preferably made of natural rubber with good resilience and wear resistance, so that the leather ring 221 can withstand frequent deformation when the ammonia tail gas is at positive pressure or negative pressure, which can also increase its service life and reliability.

[0058] In an embodiment of the present invention, the water supply valve 12 is preferably configured with a pneumatic ball valve with a feedback signal, and the water supply valve 12 is electrically connected to the liquid level meter 14 to achieve the purpose of automatically replenishing water to the set liquid level; the drain valve 15 is preferably configured with a pneumatic ball valve with a feedback signal, and the drain valve 15 is connected to the density meter 13 to achieve the purpose of automatically discharging saturated ammonia water.

[0059] In the embodiment of the present invention, the ventilation duct 21 at the first connection port 211 is fixedly connected to the connecting pipe 5 leading out from the reactor 3 via a flange; the ventilation duct 21 at the second connection port 212 is fixedly connected to the pipe extending into the water container 1 via a flange; at the third connection port 213, the air filter 223 is fixedly connected to the ventilation duct 21 via a flange, and the connecting rod 222 is fixed to the flange here, or the connecting rod 222 is fixed to the ventilation duct 21 of this section.

[0060] With respect to the above-mentioned embodiment, possible changes of the present invention are described as follows:

[0061] 1. In the above embodiments, the connection method between the leather ring 221 and the connecting rod 222 can be bolt connection, fixed connection, etc., which can make the leather ring 221 completely fixed and prevent air leakage at the connection to form a closed state. The present invention does not limit the connection method.

[0062] 2. In the above embodiments, the abutting surface 2321 of the base 232 may be an arc surface or a line-contact annular surface, which can be tightly matched with the surface of the valve ball 233 to form a closed state. The present invention does not limit the shape of the abutting surface 2321.

[0063] 3. In the above embodiments, the liquid level meter 14 may be a flap liquid level meter 14 or a radar liquid level meter 14 or a static pressure liquid level meter 14 , which only monitors the liquid level of the water container 1 . The present invention does not limit the type of the liquid level meter 14 .

[0064] 4. The device can also be used in other places where ammonia absorption is required and ventilation and pressure compensation are required.

[0065] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An ammonia recovery device capable of achieving ventilation, arranged for a reaction kettle (3), characterized in that: The ammonia recovery device comprises a water container (1) and a ventilation mechanism (2); wherein: The water container (1) is a container for storing ammonia water, and is provided with an exhaust gas outlet (11), a water supply valve (12), a density meter (13), a liquid level meter (14) and a liquid discharge valve (15); The tail gas outlet (11) and the water supply valve (12) are both arranged at the top of the water container (1); the density meter (13) is arranged at a position below the liquid level of the water container (1); the liquid level meter (14) matches the high and low liquid levels of the water container (1); the drain valve (15) is arranged at the bottom of the water container (1); and the outlet of the drain valve (15) is connected to the ammonia storage tank (4); The ventilation mechanism (2) is a mechanism having a ventilation pipe (21) for ventilation between the reaction kettle (3), the water container (1) and the external atmosphere. The ventilation pipe (21) has a first connection port (211) connected to the reaction kettle (3), a second connection port (212) selectively connected to the water container (1) and a third connection port (213) selectively connected to the external atmosphere. The ventilation pipe (21) is provided with a first check system (22) and a second check system (23); The first non-return system (22) is arranged near the third connection port (213), and comprises a leather ring (221), a connecting rod (222), and an air filter (223). The leather ring (221) is arranged for the ventilation duct (21), and the leather ring (221) has an outer contact surface, and the outer contact surface of the leather ring (221) matches the inner wall of the ventilation duct (21). The leather ring (221) is connected to and fixed in the ventilation duct (21) by the connecting rod (222). The filter (223) is fixed to the ventilation pipe (21) and is connected to the external atmosphere; after the ammonia tail gas enters the ventilation mechanism (2), the positive pressure of the ammonia tail gas causes the leather ring (221) to expand outward under pressure, and to fit tightly with the inner wall of the ventilation mechanism (2), thereby preventing the ammonia tail gas from passing through; the negative pressure generated by the discharge of the reaction kettle (3) causes the leather ring (221) to contract, and a gap is generated between the leather ring (221) and the inner wall of the ventilation mechanism (2), so that air enters the reaction kettle (3) through the ventilation pipe (21) to perform pressure compensation; The second check system (23) is arranged near the second connection port (212), and comprises a positioning ring (231), a base (232), a valve ball (233) and a limiting ring (234); the positioning ring (231) is installed in the ventilation pipe (21) for positioning; the base (232) is fixed to the ventilation pipe (21) by the positioning ring (231); the base (232) is provided with an abutment surface (2321) matching the spherical surface of the valve ball (233); the limiting ring (234) is arranged at a position of the ventilation pipe (21) near the second connection port (212) for the valve ball (233); The limiting ring (234) is located above the base (232) and is positioned by the base (232); the ammonia tail gas in the reactor (3) enters the ventilation mechanism (2) through the ventilation pipe (21) to generate positive pressure, and the ammonia tail gas pushes the valve ball (233) upward to enter the water container (1); when the reactor (3) is discharged, negative pressure is generated in the reactor (3), the ventilation pipe (21) and the ventilation mechanism (2), and the valve ball (233) is in close contact with the abutment surface (2321) under the action of its own weight and negative pressure, thereby preventing the solution in the water container (1) from being sucked back; The abutting surface (2321) of the base (232) is an arc surface in surface contact with the valve ball (233) or an annular surface in line contact with the valve ball (233); the inner wall of the ventilation duct (21) has a contact surface in contact with the leather ring (221), and the roughness of the contact surface is required to be Ra1.6 or above.

2. The ammonia recovery device capable of achieving ventilation according to claim 1, characterized in that: The valve ball (233) is made of Teflon material, and the surface finish of the valve ball (233) is Ra1.6 or above; the base (232) is made of Teflon material, and the abutting surface (2321) of the base (232) has the same roundness as the valve ball (233), and the surface finish of the abutting surface (2321) of the base (232) is Ra1.6 or above.

3. The ammonia recovery device capable of achieving ventilation according to claim 1, characterized in that: The leather ring (221) is made of natural rubber.

4. The ammonia recovery device capable of achieving ventilation according to claim 1, characterized in that: The leather ring (221) and the connecting rod (222) are connected by bolts.

5. The ammonia recovery device capable of achieving ventilation according to claim 1, characterized in that: The liquid level meter (14) is a flap liquid level meter (14), a radar liquid level meter (14) or a static pressure liquid level meter (14).

6. The ammonia recovery device capable of achieving ventilation according to claim 1, characterized in that: The water supply valve (12) is a pneumatic ball valve configured with a feedback signal, and the water supply valve (12) is connected to the liquid level meter (14) via an electrical signal.

7. The ammonia recovery device capable of achieving ventilation according to claim 1, characterized in that: The liquid discharge valve (15) is a pneumatic ball valve configured with a feedback signal, and the liquid discharge valve (15) is connected to the density meter (13) via an electrical signal.

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