Ammonia-nitrogen wastewater steam stripping recovery system

Abstract

The utility model discloses an ammonia-nitrogen wastewater steam stripping recovery system which comprises a steam stripping tower, a condenser, an ammonia water reflux pump, a condenser, an ammonia water heat exchanger, an ammonia water reaction tank and a circulating pump, wherein the steam stripping tower, the condenser and the ammonia water reflux pump are connected through a pipeline, and a pipeline connected with an outlet of the ammonia water reflux pump is connected with an ammonia water storage tank; an outlet of a heat exchange tube pass in the ammonia water heat exchanger is connected with a first circulating tube, an inlet of the heat exchange tube pass is connected with a second circulating tube, an outlet of a condensation tube pass of the condenser is connected with the second circulating tube, an inlet of the condensation tube pass is connected with the first circulating tube, and an inlet of the ammonia water reaction tank is connected with an outlet of a heat exchange shell pass. An outlet of the ammonia water reaction tank is connected with an inlet of the heat exchange shell pass through a circulating pump, and a pipeline connected with the inlet of the heat exchange shell pass is connected with the ammonia water storage tank. According to the utility model, the recovery rate of ammonia nitrogen is improved, and the emission of ammonia gas is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ammonia nitrogen recovery, in particular to an ammonia nitrogen wastewater stripping recovery system. Background Art

[0002] Ammonia is a commonly used chemical in industrial production. However, its use will produce a large amount of ammonia nitrogen wastewater, in which ammonia nitrogen exists in the form of ammonium salts and free ammonia. This wastewater can easily lead to eutrophication of water bodies, black and smelly water bodies, and toxicity to fish and certain organisms. This is mainly caused by industries such as domestic water use, industrial fertilizer production, meat processing, steel, coal chemical industry, and aquaculture. Therefore, it is very important to treat and recycle industrial ammonia nitrogen wastewater.

[0003] The current technology mainly adopts the method of stripping deamination and ammonia recovery. This method enriches the free ammonia and water in the wastewater into a gas phase through steam heating, and then enters the condensation device for condensation. The condensed ammonia water can enter the top of the tower for distillation or reuse according to the concentration. This process has the advantages of simple process, stable effect, strong applicability and low investment. However, there are some problems in the operation process. For example, the stripping deamination process is prone to overpressure, which causes the safety valve of the condensation device to open, releasing a large amount of ammonia into the atmosphere, making it impossible to effectively utilize ammonia, and causing secondary pollution to the environment. In addition, the control of the condensation temperature by a single condensation recovery device is relatively single, resulting in a low recovery rate of ammonia nitrogen in ammonia nitrogen wastewater, and easily leading to the problem of high ammonia nitrogen content in the tower bottom effluent. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide an ammonia nitrogen wastewater stripping recovery system to improve the recovery rate of ammonia nitrogen and reduce the emission of ammonia gas.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] An ammonia nitrogen wastewater stripping recovery system comprises a stripping tower, a condenser, an ammonia reflux pump and an ammonia storage tank, wherein the stripping tower, the condenser and the ammonia reflux pump are connected by a pipeline, and the pipeline connected to the outlet of the ammonia reflux pump is connected to the ammonia storage tank, and further comprises a condenser, an ammonia heat exchanger, an ammonia reaction tank and a circulation pump, wherein a heat exchange tube side and a heat exchange shell side are arranged in the ammonia heat exchanger, the outlet of the heat exchange tube side is connected to a first circulation tube, and the inlet of the heat exchange tube side is connected to a second circulation tube, the condenser is provided with a condensation tube side, the outlet of the condensation tube side is connected to the second circulation tube, the inlet of the condensation tube side is connected to the first circulation tube, the inlet of the ammonia reaction tank is connected to the outlet of the heat exchange shell side, the outlet of the ammonia reaction tank is connected to the inlet of the heat exchange shell side through a circulation pump, and the pipeline connected to the inlet of the heat exchange shell side is connected to the ammonia storage tank.

[0007] As a further improvement of the above technical solution:

[0008] An exhaust pipe is connected between the condenser and the heat exchange shell, an ejector is provided at the inlet of the ammonia reaction tank, a diffusion outlet of the ejector is connected to the inlet of the ammonia reaction tank, a nozzle of the ejector is connected to the exhaust pipe, and a suction port of the ejector is connected to the outlet of the heat exchange shell.

[0009] The drain pipe is provided with a safety valve and a manual drain valve.

[0010] The pipeline between the outlet of the circulation pump and the inlet of the heat exchange shell is connected to the inlet of the ammonia water storage tank.

[0011] An ammonia concentration meter is provided at the outlet of the circulation pump, and the ammonia concentration meter is connected to the inlet of the ammonia storage tank.

[0012] The pipeline between the stripping tower and the ammonia water reflux pump is connected to the inlet of the ammonia water storage tank.

[0013] The pipelines connected to the inlet of the ammonia water storage tank are all provided with inlet valves.

[0014] The first circulation pipe is connected with a diverter pipe, and a diverter valve is provided on the diverter pipe.

[0015] A temperature sensor is provided on the pipeline between the condenser and the ammonia reflux pump, and an ammonia concentration meter is provided on the pipeline between the stripping tower and the ammonia reflux pump.

[0016] The ammonia water reaction tank is provided with a pressure sensor and a temperature sensor.

[0017] Compared with the prior art, the advantages of the utility model are:

[0018] Through the multi-stage variable temperature condensation circuit, ammonia is condensed in sections at different temperatures, which improves the recovery rate of ammonia nitrogen, reduces ammonia emissions, and is beneficial to environmental protection; by optimizing the cooling medium flow and temperature of the condenser, energy saving and consumption reduction are achieved, while reducing the energy consumption and operating costs of the system; by better controlling the concentration and purity of ammonia water, the quality of the product is improved to meet the needs of the industry with high requirements for ammonia water quality; through the multi-stage variable temperature condensation circuit, it can adapt to the ammonia recovery needs under different working conditions, enhance the stability and reliability of the system, and realize automated operation and remote monitoring, thereby improving the operating efficiency and management level of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of the ammonia nitrogen wastewater stripping recovery system.

[0020] Legend:

[0021] 1. Stripping tower; 2. Condenser; 21. Drain pipe; 22. Safety valve; 23. Manual drain valve; 3. Ammonia reflux pump; 31. Temperature sensor; 4. Ammonia storage tank; 41. Inlet valve; 5. Ammonia heat exchanger; 51. First circulation pipe; 52. Second circulation pipe; 53. Diverter pipe; 54. Diverter valve; 6. Ammonia reaction tank; 61. Pressure sensor; 7. Circulation pump; 71. Ammonia concentration meter; 8. Ejector. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] like Figure 1 As shown, the ammonia nitrogen wastewater stripping recovery system of this embodiment includes a stripping tower 1, a condenser 2, an ammonia reflux pump 3 and an ammonia storage tank 4. The stripping tower 1, the condenser 2 and the ammonia reflux pump 3 are connected by a pipeline, and the pipeline connected to the outlet of the ammonia reflux pump 3 is connected to the ammonia storage tank 4. It also includes a condenser 2, an ammonia heat exchanger 5, an ammonia reaction tank 6 and a circulating pump 7. The ammonia heat exchanger 5 is provided with a heat exchange tube side and a heat exchange shell side. The outlet of the heat exchange tube side is connected to the first circulation pipe 51, and the inlet of the heat exchange tube side is connected to the second circulation pipe 52. The condenser 2 is provided with a condensation tube side, the outlet of the condensation tube side is connected to the second circulation pipe 52, and the inlet of the condensation tube side is connected to the first circulation pipe 51. The inlet of the ammonia reaction tank 6 is connected to the outlet of the heat exchange shell side, and the outlet of the ammonia reaction tank 6 is connected to the inlet of the heat exchange shell side through the circulating pump 7, and the pipeline connected to the inlet of the heat exchange shell side is connected to the ammonia storage tank 4.

[0024] The system includes a stripping process, a primary condensation loop, a secondary condensation loop, a reaction loop and ammonia recovery. The stripping process is as follows: ammonia nitrogen wastewater enters the stripping tower 1, the wastewater contacts the steam in the tower, ammonia is vaporized, and flows to the top of the tower with the gas phase. The primary condensation loop is as follows: the gas phase logistics enters the condenser 2, and the ammonia and water vapor are gradually condensed into liquids by the cooling circulating water inside the condenser 2, producing ammonia condensate. The secondary condensation loop is as follows: cooling circulating water flows through the first circulation pipe 51 and the second circulation pipe 52, and the ammonia condensate is further cooled through the ammonia heat exchanger 5 to reach a lower temperature, and the residual heat is discharged through the cooling circulating water. The reaction loop is as follows: the ammonia condensate after heat exchange enters the ammonia reaction tank 6, and is condensed again through the circulating pump 7, thereby further cooling the ammonia condensate and increasing the recovery rate of ammonia. The ammonia water recovery is as follows: the low-concentration ammonia water collected from the bottom of the condenser 2 is pumped back to the top of the stripping tower 1 through the ammonia water reflux pump 3 for reprocessing, while the ammonia water condensate with higher concentration is stored in the ammonia water storage tank 4 for recycling.

[0025] The present invention uses a multi-stage variable temperature condensation circuit, and ammonia is condensed in sections at different temperatures, thereby improving the recovery rate of ammonia nitrogen, reducing ammonia emissions, and being beneficial to environmental protection; by optimizing the cooling medium flow and temperature of the condenser 2, energy saving and consumption reduction are achieved, while reducing the energy consumption and operating costs of the system; by better controlling the concentration and purity of ammonia water, the quality of the product is improved, and the industry demand for high quality ammonia water is met; the multi-stage variable temperature condensation circuit is used to adapt to the ammonia recovery needs under different working conditions, enhance the stability and reliability of the system, and realize automated operation and remote monitoring, thereby improving the operating efficiency and management level of the system.

[0026] In this embodiment, an exhaust pipe 21 is connected between the condenser 2 and the heat exchange shell, an ejector 8 is provided at the inlet of the ammonia reaction tank 6, the diffusion outlet of the ejector 8 is connected to the inlet of the ammonia reaction tank 6, the nozzle of the ejector 8 is connected to the exhaust pipe 21, and the suction port of the ejector 8 is connected to the outlet of the heat exchange shell. The ejector 8 is composed of a mixing chamber, a contraction section, a throat section and a diffusion section. The diameter of the contraction section of the ejector 8 gradually decreases along the fluid direction, and the diameter of the diffusion section gradually expands along the fluid direction. Negative pressure is formed in the mixing chamber of the ejector 8, and the ammonia water discharged from the outlet of the heat exchange shell is introduced into the ejector 8. The gaseous ammonia is mixed and absorbed in the mixing chamber of the ejector 8 and then enters the ammonia reaction tank 6 through the contraction section, the throat section and the diffusion section. The ejector 8 can efficiently mix ammonia water and gaseous ammonia to form a uniform mixture. Due to the negative pressure formed in the mixing chamber, the gaseous ammonia can fully contact and be absorbed by the ammonia water, making the reaction more thorough. The ejector 8 adopts the injection principle and uses the kinetic energy generated by the high-speed airflow to introduce the gaseous ammonia into the mixing chamber. This mechanical mixing process does not require additional energy consumption, saves energy and reduces operating costs. The ejector 8 has a simple structure, is easy to operate, does not require a complex control system, and is easy to maintain and manage. The operator can easily adjust the flow rate and mixing effect of the ejector to meet the needs under different process conditions. The ejector 8 is suitable for systems of different scales and process requirements and has strong versatility. Whether it is a small or large ammonia nitrogen wastewater treatment system, the ejector can be flexibly applied and maintain stable performance under different working conditions. In the process of mixing aqueous ammonia and gaseous ammonia, the ejector 8 can efficiently absorb and dissolve gaseous ammonia into aqueous ammonia, reducing the emission of ammonia. This is conducive to reducing pollution to the environment and meeting environmental protection requirements. In short, the use of the ejector 8 can achieve efficient mixing of aqueous ammonia and gaseous ammonia, save energy and reduce operating costs, is easy to operate and has strong applicability, and has the advantages of environmental protection and energy saving.

[0027] In this embodiment, a safety valve 22 is provided on the exhaust pipe 21. The setting of the safety valve 22 provides an important safety guarantee mechanism. In the event of a cooling system failure or abnormality, such as failure of the condenser 2 or interruption of the cooling circulating water supply, the exhaust pipe 21 may accumulate too much pressure. At this time, the safety valve 22 will automatically start to release the excess pressure to prevent the stripping tower 1 from overpressure, thereby protecting the safe operation of the equipment. Overpressure may cause damage or failure of related equipment such as the stripping tower 1, or even cause serious accidents. Through the setting of the safety valve 22, the overpressure gas can be discharged from the system in time to avoid damage to the equipment, extend the service life of the equipment, and reduce the cost of maintenance and replacement. Preventing the stripping tower 1 from overpressure can not only protect the safety of the equipment, but also prevent the leakage of harmful substances from polluting the environment. The timely start-up of the safety valve 22 can effectively control the release of gas, reduce the impact on the surrounding environment, and is conducive to environmental protection and ecological balance. The automatic start-up and automatic closing functions of the safety valve 22 make it very convenient to operate. Once the system pressure exceeds the set value, the safety valve 22 will start immediately to release the overpressure gas without manual intervention. This can reduce the burden on operators and improve operational efficiency. In short, the drain pipe 21 equipped with a safety valve 22 can effectively prevent the occurrence of overpressure in the stripping tower 1 due to a failure in the cooling system, protect the safe operation of the equipment, extend the life of the equipment, reduce the impact on the environment, and improve operational convenience, which has important safety guarantees and economic benefits.

[0028] In this embodiment, a manual drain valve 23 is provided on the drain pipe 21. The manual drain valve 23 can be adjusted according to the actual conditions of the concentration temperature of the condenser 2 and the ammonia concentration of the ammonia reaction tank 6. This flexibility allows the operator to flexibly adjust the opening of the manual drain valve 23 according to the operating state and needs of the system to achieve the best treatment effect. Through the setting of the manual drain valve 23, the amount of ammonia gas phase flow entering the ejector 8 can be accurately controlled. By adjusting the opening of the manual drain valve 23, an optimal balance point can be found between the ammonia concentration temperature and the ammonia concentration to ensure the stable operation of the system and the best treatment effect. The setting of the manual drain valve 23 can ensure the operator's control and monitoring of the system, and enhance the safety of the system. The operator can adjust the opening of the manual drain valve 23 at any time according to the actual situation, deal with problems in the system in a timely manner, and avoid potential safety hazards. Through the precise adjustment of the manual drain valve 23, the resources in the system can be maximized and the waste of energy can be reduced. The opening of the manual drain valve 23 is set to one-third of the opening so that the ammonia gas phase flow gradually enters the ejector 8, which helps to optimize the treatment process and improve energy efficiency. The operation of the manual drain valve 23 is relatively simple and convenient, and the operator can adjust it at any time according to the system operation status without the need for additional complex control equipment, which helps to improve the operator's work efficiency and convenience of operation. In short, the setting of the manual drain valve 23 in the system brings the advantages of flexibility, precise control, safety, energy-saving optimization and convenient operation, which helps to improve the stability, processing efficiency and economic benefits of the system.

[0029] In this embodiment, the pipeline between the outlet of the circulating pump 7 and the inlet of the heat exchange shell is connected to the inlet of the ammonia water storage tank 4. The ammonia water can be easily and quickly recovered to the ammonia water storage tank 4, the pipeline design is simplified, the energy consumption is reduced, the leakage risk is reduced, and the convenience of operation and maintenance is improved, thereby optimizing the operating efficiency and economy of the wastewater treatment system.

[0030] In this embodiment, the outlet of the circulating pump 7 is provided with an ammonia concentration meter 71, and the ammonia concentration meter 71 is connected to the inlet of the ammonia storage tank 4. Through the ammonia concentration meter 71, the concentration of ammonia can be monitored in real time. This monitoring capability enables the operator to understand the concentration of ammonia in time, so that the operating parameters can be adjusted to optimize the system performance, and abnormal conditions can be discovered and handled in time, thereby improving the stability and reliability of the system. It is helpful to achieve accurate control of the concentration of ammonia. By monitoring the concentration of ammonia in real time and adjusting the recovery and utilization of ammonia according to actual conditions, the reuse rate of ammonia can be effectively improved, resources can be saved, and production costs can be reduced, thereby achieving the purpose of saving energy and reducing waste. It is helpful to optimize the operation of the wastewater treatment system. By monitoring the concentration of ammonia in real time and adjusting the recovery process, it can better adapt to different production needs and wastewater treatment processes, improve the adaptability and flexibility of the system, and further improve the overall operation efficiency and treatment level of the system.

[0031] In this embodiment, the pipeline between the stripping tower 1 and the ammonia reflux pump 3 is connected to the inlet of the ammonia storage tank 4. The system structure is simplified, the reflux efficiency is improved, the energy consumption and cost are reduced, the operation and maintenance are convenient, and it is beneficial to improve the stability and economy of the wastewater treatment system.

[0032] In this embodiment, an inlet valve 41 is provided on the pipeline connected to the inlet of the ammonia water storage tank 4. Flexible control and recycling of ammonia water is achieved, effective utilization of resources is achieved, the operating cost of the wastewater treatment system is reduced, the sustainability of the wastewater treatment system is improved, and multiple advantages are brought to the wastewater treatment process.

[0033] In this embodiment, the first circulation pipe 52 is connected to a shunt pipe 53, and a shunt valve 54 is provided on the shunt pipe 53. By controlling the shunt valve 54 to adjust the flow of condensed water, the temperature of the condenser 2 can be accurately controlled, which can improve the performance and energy efficiency of the system, reduce the operating cost of the system, and reduce the risk of leakage, thereby bringing multiple advantages to the wastewater treatment system.

[0034] In this embodiment, a temperature sensor 31 is provided on the pipeline between the condenser 2 and the ammonia reflux pump 3, and an ammonia concentration meter 71 is provided on the pipeline between the stripping tower 1 and the ammonia reflux pump 3. This helps to monitor the condensate temperature and ammonia concentration in real time. This monitoring capability enables the operator to understand the system operation status in a timely manner, adjust the operating parameters to optimize the system performance, and promptly discover and handle abnormal situations, thereby improving the stability and reliability of the system.

[0035] In this embodiment, a pressure sensor 61 and a temperature sensor 31 are provided on the ammonia reaction tank 6. This helps to monitor the pressure and temperature in the tank in real time. This monitoring capability enables the operator to understand the operating status in the tank in a timely manner, prevent potential safety risks, and take necessary measures to ensure the safe operation of the system. At the same time, adjustments can be made based on real-time monitoring data, thereby improving the stability and production efficiency of the system.

[0036] In this embodiment, a pressure sensor 61 and a temperature sensor 31 are installed on the top of the stripping tower 1 to strictly control the temperature and pressure at the top of the stripping tower 1. In addition, the condensate temperature and concentration in the condenser 2 must be strictly monitored and controlled to ensure that the temperature of the reflux liquid of the condenser 2 is maintained in the range of 65°C to 78°C. If the temperature of the condenser 2 is too high, the gas phase logistics will not be effectively condensed, resulting in pressure buildup at the top of the stripping tower 1, affecting the effective removal of free ammonia in the ammonia nitrogen wastewater; conversely, if the temperature of the condenser 2 is too low, most of the ammonia will not be effectively condensed and refluxed, affecting the efficient recovery of ammonia water. Therefore, the ammonia content in the reflux condensate is controlled by controlling the condensate temperature of the condenser 2 to ensure the normal operation of the system and the effect of wastewater treatment.

[0037] In this embodiment, by setting a bypass valve on the second circulation pipe 51, the water inlet of the circulating water pipeline is adjusted to achieve precise control of the temperature in the condenser 2, thereby improving the stability and efficiency of the system operation. This design can adjust the working temperature of the condenser 2 according to actual conditions, avoid the influence of too high or too low temperature on the system, ensure the effective condensation and recovery of ammonia, thereby improving the treatment efficiency of the wastewater treatment system and the recovery rate of ammonia. At the same time, by adjusting the bypass valve, it is also possible to flexibly respond to the needs of the condenser 2 under different working conditions, achieve energy conservation and reduce the system operation cost.

[0038] Working principle: When the ammonia concentration in the condenser 2 is high, the manual drain valve 23 can be partially opened to allow ammonia to enter the ejector 8 in the form of gas. At the same time, the ammonia reaction tank 6 monitors the temperature and pressure in real time through the pressure sensor 61 and the temperature sensor 31 to ensure that the temperature of the cooling circulating water in the ammonia heat exchanger 5 is maintained within the range of 10°C to 25°C, so that the temperature of the ammonia in the ammonia reaction tank 6 is maintained at a low level.

[0039] An ammonia recovery process mainly includes the following steps: Ph adjustment and preheating process, ammonia water balance adjustment, and distillation process. The process realizes an efficient ammonia recovery process and achieves the purpose of energy saving and environmental protection through the organic combination of Ph adjustment and preheating process, ammonia water balance adjustment and distillation process.

[0040] The Ph adjustment and preheating process is as follows: before the ammonia nitrogen wastewater enters the stripping tower 1, alkali solution needs to be added to adjust the Ph to above 11.4, so that the ammonium salt in the wastewater is completely converted into free ammonia to meet the requirements of stripping. The ammonia nitrogen wastewater after Ph adjustment is heat exchanged with the tower bottom water through a plate heat exchanger, reducing the amount of steam required when the wastewater enters the stripping tower 1, achieving energy saving and environmental protection.

[0041] The ammonia balance is adjusted as follows: the ammonia nitrogen wastewater preheated by the plate heat exchanger enters the stripping tower 1 from the middle and upper part of the stripping tower 1. Low-pressure steam enters the stripping tower 1 from the bottom of the tower as a heat source. In the stripping tower 1, the ammonia nitrogen wastewater contacts the steam on the inner tower plate, so that the ammonia in the ammonia nitrogen wastewater is released in gaseous form. The chemical reaction formulas involved in the process are: NH3+H2O===NH3·H2O (reversible reaction), NH3·H2O===NH4++OHˉ (reversible reaction) Ionization constant: K=1.8×10ˇ5 (25℃).

[0042] Distillation process: In the stripping tower 1, the ammonia nitrogen wastewater flows horizontally along the inner tower plate, and the steam flows vertically upward through the holes, and the gas phase substances mainly composed of ammonia are released from the ammonia nitrogen wastewater. A mixture of ammonia vapor and water vapor is obtained at the top of the tower, and the tower bottom water after deammoniation is obtained at the bottom of the tower, and its ammonia content is reduced to 15mg / L.

[0043] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. For those skilled in the art, improvements and changes obtained without departing from the technical concept of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An ammonia nitrogen wastewater stripping recovery system, comprising a stripping tower (1), a condenser (2), an ammonia reflux pump (3) and an ammonia storage tank (4), wherein the stripping tower (1), the condenser (2) and the ammonia reflux pump (3) are connected by a pipeline, and the pipeline connected to the outlet of the ammonia reflux pump (3) is connected to the ammonia storage tank (4), characterized in that: The invention also comprises a condenser (2), an ammonia water heat exchanger (5), an ammonia water reaction tank (6) and a circulation pump (7). The ammonia water heat exchanger (5) is provided with a heat exchange tube side and a heat exchange shell side. The outlet of the heat exchange tube side is connected to a first circulation tube (51), and the inlet of the heat exchange tube side is connected to a second circulation tube (52). The condenser (2) is provided with a condensation tube side. The outlet of the condensation tube side is connected to the second circulation tube (52), and the inlet of the condensation tube side is connected to the first circulation tube (51). The inlet of the ammonia water reaction tank (6) is connected to the outlet of the heat exchange shell side. The outlet of the ammonia water reaction tank (6) is connected to the inlet of the heat exchange shell side through the circulation pump (7), and the pipeline connected to the inlet of the heat exchange shell side is connected to the ammonia water storage tank (4).

2. The ammonia nitrogen wastewater stripping recovery system according to claim 1, characterized in that: An exhaust pipe (21) is connected between the condenser (2) and the heat exchange shell side, an ejector (8) is provided at the inlet of the ammonia reaction tank (6), a diffusion outlet of the ejector (8) is connected to the inlet of the ammonia reaction tank (6), a nozzle of the ejector (8) is connected to the exhaust pipe (21), and a suction port of the ejector (8) is connected to the outlet of the heat exchange shell side.

3. The ammonia nitrogen wastewater stripping recovery system according to claim 2 is characterized in that: The drain pipe (21) is provided with a safety valve (22) and a manual drain valve (23).

4. The ammonia nitrogen wastewater stripping recovery system according to claim 3 is characterized in that: The pipeline between the outlet of the circulation pump (7) and the inlet of the heat exchange shell is connected to the inlet of the ammonia water storage tank (4).

5. The ammonia nitrogen wastewater stripping recovery system according to claim 4, characterized in that: An ammonia concentration meter (71) is provided at the outlet of the circulation pump (7), and the ammonia concentration meter (71) is connected to the inlet of the ammonia storage tank (4).

6. The ammonia nitrogen wastewater stripping recovery system according to claim 5, characterized in that: The pipeline between the stripping tower (1) and the ammonia water reflux pump (3) is connected to the inlet of the ammonia water storage tank (4).

7. The ammonia nitrogen wastewater stripping recovery system according to claim 6, characterized in that: The pipelines connected to the inlet of the ammonia water storage tank (4) are all provided with inlet valves (41).

8. The ammonia nitrogen wastewater stripping recovery system according to claim 7, characterized in that: The first circulation pipe (51) is connected to a diverter pipe (53), and a diverter valve (54) is provided on the diverter pipe (53).

9. The ammonia nitrogen wastewater stripping recovery system according to claim 8, characterized in that: A temperature sensor (31) is provided on the pipeline between the condenser (2) and the ammonia reflux pump (3), and an ammonia concentration meter (71) is provided on the pipeline between the stripping tower (1) and the ammonia reflux pump (3).

10. The ammonia nitrogen wastewater stripping recovery system according to claim 9, characterized in that: The ammonia water reaction tank (6) is provided with a pressure sensor (61) and a temperature sensor (31).

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