Liquid ammonia pipeline emptying recovery device and working method thereof

Abstract

This invention relates to the technical field of liquid ammonia venting, and discloses a liquid ammonia pipeline venting and recovery device and its working method. The liquid ammonia pipeline venting and recovery device includes a vent valve, a gas-liquid separator, a dissolving tower, a reflux tank, an ammonia liquid storage tank, and an ammonia water storage tank. Liquid ammonia enters the gas-liquid separator through the vent valve for separation. The first outlet of the gas-liquid separator delivers liquid ammonia to the ammonia liquid storage tank for direct storage, and the second outlet of the gas-liquid separator delivers ammonia gas to the dissolving tower. The first outlet of the dissolving tower delivers ammonia gas mixture to the reflux tank, and the reflux tank cools the ammonia gas mixture before discharging it into the dissolving tower through its first outlet. By recovering liquid ammonia, circulating and cooling and dissolving ammonia gas, and storing it separately in the ammonia liquid storage tank and the ammonia water storage tank, this invention solves the technical problems of the existing technology, such as the danger, environmental pollution, and waste of resources associated with venting liquid ammonia. It achieves the technical effect of safe liquid ammonia recovery that does not pollute the environment or waste liquid ammonia.

Description

Technical Field

[0001] This invention relates to the field of liquid ammonia venting technology, and in particular to a liquid ammonia pipeline venting and recovery device and its working method. Background Technology

[0002] Liquid ammonia, as an important chemical raw material, is colorless and has a strong, pungent odor. It is also highly volatile and easily vaporized, making it widely used in various industrial fields such as fertilizer production, refrigeration systems, chemical synthesis, and pharmaceutical intermediate manufacturing. It is an indispensable core medium in industrial production processes. During the storage, transportation, and use of liquid ammonia, factors such as rising ambient temperature, system pressure fluctuations, and changes in equipment operating load can cause liquid ammonia to vaporize to varying degrees. This leads to a continuous increase in pressure within storage containers, pipelines, and related equipment. To prevent the system pressure from exceeding the safe pressure limit and to ensure the safety of equipment and personnel, excess liquid ammonia must be released through venting valves to maintain the system pressure within the safe threshold range. This is an essential safety operating procedure for the normal operation of liquid ammonia systems.

[0003] As the core control component of a liquid ammonia venting system, the accuracy of the venting valve's set pressure directly determines the stability and safety of the venting process. In actual industrial operation, due to unreasonable venting valve set pressure settings, insufficient setting accuracy, or the influence of factors such as ambient temperature changes, valve wear, and media corrosion, the set pressure is prone to deviation, which can easily trigger a rapid flash evaporation of liquid ammonia. Liquid ammonia has extremely strong vaporization characteristics and a high latent heat of vaporization. Once rapid flash evaporation occurs, it instantly absorbs a large amount of heat and converts into ammonia gas, causing a rapid expansion in volume. This leads to a sudden surge in pressure within the venting pipeline, while simultaneously releasing a large amount of cold energy, causing a rapid drop in temperature of the venting valve, connecting pipelines, and surrounding recovery equipment, creating an extreme low-temperature environment. Such extreme low temperatures cause a sharp decline in the low-temperature toughness of metal materials in pipes, valves, and recovery equipment, leading to problems such as brittleness, seal failure, and interface leakage. Particularly, components made of ordinary carbon steel experience a significant reduction in impact toughness at low temperatures, making them prone to rupture even under slight external force or pressure fluctuations. Simultaneously, the low temperatures cause water vapor in the air to come into contact with the outer walls of pipelines, rapidly condensing into frost and accumulating, eventually forming a low-temperature blockage. This blocks the venting channels, further exacerbating system pressure increases and creating a vicious cycle of "pressure increase - intensified flash evaporation - severe blockage." Even more seriously, if the blockage causes the system pressure to continue rising and exceed the equipment's pressure limit, or if a pipe or valve ruptures causing a large leak of liquid ammonia, the leaked liquid ammonia will rapidly vaporize, generating a huge pressure shock. Furthermore, once the ammonia gas mixes with air and reaches its explosive limit, it is highly susceptible to explosion upon contact with open flames, static electricity, or other ignition sources, causing major safety accidents such as equipment damage and personal injury. Such safety hazards and accidents caused by improper liquid ammonia venting occur frequently in the chemical production field.

[0004] Secondly, the release of liquid ammonia causes serious environmental pollution, disrupts the ecological balance, and threatens human health. Liquid ammonia itself is highly irritating and toxic. During the release process, untreated liquid ammonia is directly discharged into the atmosphere, causing serious air pollution. After the ammonia gas diffuses into the surrounding environment, it irritates the respiratory tract, eyes, and other mucous membranes, causing discomfort such as coughing, sore throat, and blurred vision. Long-term exposure can also damage organs such as the liver and kidneys. At the same time, the released ammonia gas combines with moisture in the air to form ammonia water, which seeps into the soil and surface water sources after being settled by rainwater, leading to soil salinization, water pollution, damage to the growing environment of crops and the living environment of aquatic organisms, and thus affecting the stability of the ecosystem.

[0005] Finally, venting liquid ammonia results in a severe waste of valuable resources and significantly increases production costs for enterprises. The preparation of liquid ammonia requires a complex synthesis process, consuming large amounts of energy and raw materials such as coal, electricity, and water. The preparation process is energy-intensive and costly, making it a high-value chemical raw material. In current technology, vented liquid ammonia is directly discharged into the atmosphere without effective recovery and utilization devices, leading to the ineffective loss of a large amount of high-value liquid ammonia resources and causing serious resource waste. Summary of the Invention

[0006] The purpose of this invention is to provide a liquid ammonia pipeline venting and recovery device and its working method, which solves the technical problems of the existing technology that venting liquid ammonia is very dangerous, pollutes the environment, and wastes resources.

[0007] To solve the above-mentioned technical problems, the present invention provides a liquid ammonia pipeline venting and recovery device, including a venting valve, a gas-liquid separator, a dissolving tower, a reflux tank, an ammonia liquid storage tank, and an ammonia water storage tank; The inlet of the gas-liquid separator is connected to the vent valve, and liquid ammonia enters the gas-liquid separator through the vent valve; The first outlet of the gas-liquid separator is connected to the ammonia storage tank, and the first outlet of the gas-liquid separator supplies liquid ammonia to the ammonia storage tank. The second outlet of the gas-liquid separator is connected to the dissolving tower, and the second outlet of the gas-liquid separator supplies ammonia gas into the dissolving tower. The dissolving tower is equipped with cooling water for cooling the ammonia gas. The first outlet of the dissolving tower is connected to the reflux tank. The first outlet of the dissolving tower supplies ammonia gas mixture into the reflux tank. The first outlet of the reflux tank is connected to the dissolving tower. The reflux tank cools the ammonia gas mixture and then discharges it into the dissolving tower through the first outlet of the reflux tank. The second outlet of the reflux tank is connected to the ammonia storage tank, and the second outlet of the dissolving tower is connected to the ammonia storage tank.

[0008] In an optional embodiment, an ammonia condenser is provided between the first outlet of the dissolving tower and the reflux tank. The ammonia condenser is connected to both the dissolving tower and the reflux tank, and is used to condense the ammonia mixture discharged from the first outlet of the dissolving tower.

[0009] In an optional implementation, a first detection component is also included; The first detection component is disposed between the ammonia condenser and the dissolving tower. The first detection component is connected to both the dissolving tower and the ammonia condenser. The first detection component is used to detect the temperature of the ammonia mixture discharged from the first outlet of the dissolving tower.

[0010] In an optional embodiment, an ammonia condenser is provided between the second outlet of the dissolving tower and the ammonia storage tank. The ammonia condenser is connected to both the dissolving tower and the ammonia storage tank, and is used to condense the ammonia discharged from the second outlet of the dissolving tower.

[0011] In an optional implementation, a second detection component is also included; The second detection component is disposed between the dissolving tower and the ammonia water condenser. The second detection component is connected to both the dissolving tower and the ammonia water condenser. The second detection component is used to detect the temperature of the ammonia water discharged from the second outlet of the dissolving tower.

[0012] In an optional embodiment, a level gauge is provided on the gas-liquid separator, the level gauge is connected to the gas-liquid separator, and the level gauge is used to measure the liquid level height inside the gas-liquid separator.

[0013] In an optional embodiment, a second valve is provided between the first outlet of the gas-liquid separator and the ammonia storage tank. The second valve is connected to both the gas-liquid separator and the storage tank, and is also connected to the liquid level gauge via an electrical signal.

[0014] In an optional embodiment, a water supply pipe and a water supply pump are also included. The water supply pipe is connected to the water supply pump and is connected to the dissolving tower. The water supply pump supplies cooling water to the dissolving tower through the water supply pipe.

[0015] In an optional implementation, a third detection component and a first valve are also included; The third detection component and the first valve are respectively disposed between the gas-liquid separator and the dissolving tower. The third detection component and the first valve are respectively connected to the gas-liquid separator and the dissolving tower. The third detection component is used to detect the ammonia gas discharged from the second outlet of the gas-liquid separator, and the first valve is used to control the flow rate of ammonia gas entering the dissolving tower.

[0016] The present invention also provides a working method based on the liquid ammonia pipeline venting and recovery device, comprising the following steps: Open the vent valve to allow liquid ammonia to pass through the vent valve and enter the gas-liquid separator; The opening degree of the vent valve and the speed of the water supply pump are controlled based on the detection results of the third detection component. The liquid ammonia is separated by a gas-liquid separator, with the liquid ammonia at the bottom and the gas ammonia at the top. The liquid ammonia level in the gas-liquid separator is measured by a level gauge. Once the liquid ammonia level reaches the threshold, the second valve is opened to allow the liquid ammonia in the gas-liquid separator to enter the ammonia storage tank. Ammonia gas is cooled by cooling water in the dissolving tower. Part of the ammonia gas is dissolved in the cooling water and placed at the bottom of the dissolving tower, while the other part of the ammonia gas mixed with water vapor is placed at the top of the dissolving tower. The ammonia mixture is discharged from the top of the dissolving tower and then transferred to the ammonia condenser after the temperature and pressure are detected by the first detection component. The ammonia condenser cools the ammonia mixture and then discharges it into the reflux tank. Liquid ammonia mixture is stored at the bottom of the reflux tank. The ammonia mixture in the reflux tank is once again pumped back into the dissolving tower to come into contact with the cooling water. The liquid ammonia mixture at the bottom of the reflux tank is transferred to the ammonia storage tank; After the liquid ammonia mixture is discharged from the bottom of the dissolving tower, it is detected by the second detection component. The temperature and pressure detected by the second detection component are transmitted to the ammonia water condenser. The ammonia water condenser cools the liquid ammonia mixture and then transports it to the ammonia water storage tank.

[0017] This invention provides a liquid ammonia pipeline venting and recovery device, comprising a vent valve, a gas-liquid separator, a dissolving tower, a reflux tank, an ammonia liquid storage tank, and an ammonia water storage tank. The inlet of the gas-liquid separator is connected to the vent valve, and liquid ammonia enters the gas-liquid separator through the vent valve for separation. The first outlet of the gas-liquid separator is connected to the ammonia liquid storage tank, and the first outlet of the gas-liquid separator supplies liquid ammonia to the ammonia liquid storage tank for direct storage. The second outlet of the gas-liquid separator is connected to the dissolving tower, and the second outlet of the gas-liquid separator supplies ammonia gas into the dissolving tower. The dissolving tower is equipped with cooling water for cooling the ammonia gas. The first outlet of the dissolving tower is connected to the reflux tank. The system connects the dissolving tower to the reflux tank. The first outlet of the dissolving tower supplies ammonia gas mixture to the reflux tank, which in turn cools the ammonia gas mixture before discharging it back into the dissolving tower through its first outlet. The second outlet of the reflux tank is connected to the ammonia water storage tank, and the second outlet of the dissolving tower is also connected to the ammonia water storage tank. By recovering liquid ammonia, circulating and cooling ammonia gas, and storing it separately in the liquid ammonia storage tank and the ammonia water storage tank, the system solves the technical problems of the existing technology, such as the danger, environmental pollution, and waste of resources associated with venting liquid ammonia. This achieves the technical effect of safe liquid ammonia recovery that does not pollute the environment or waste liquid ammonia. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the liquid ammonia pipeline venting and recovery device mentioned in the embodiments of the present invention.

[0019] In the diagram, 1-vent valve; 2-gas-liquid separator; 3-dissolving tower; 4-reflux tank; 5-ammonia liquid storage tank; 6-ammonia water storage tank; 7-ammonia gas condenser; 8-first detection component; 9-ammonia water condenser; 10-second detection component; 11-level gauge; 12-second valve; 13-water supply pipe; 14-water supply pump; 15-third detection component; 16-first valve; 17-reflux pump; 18-third valve; 19-fourth valve; 20-fifth valve; 21-sixth valve; 22-seventh valve. Detailed Implementation

[0020] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the invention.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In related technologies, venting liquid ammonia absorbs a large amount of heat. When ammonia mixes with air and reaches its explosive limit, it is highly susceptible to explosion upon contact with open flames, static electricity, or other ignition sources, causing major safety accidents such as equipment damage and personal injury. Venting liquid ammonia is extremely dangerous. In addition, liquid ammonia itself is highly irritating and toxic. During the venting process, untreated liquid ammonia is directly released into the atmosphere, causing serious air pollution. After ammonia diffuses into the surrounding environment, it will irritate the human respiratory tract, eyes, and other mucous membranes, causing discomfort symptoms such as coughing, sore throat, and blurred vision. It will also pollute the land. Furthermore, venting liquid ammonia will result in a serious waste of valuable resources and significantly increase the production costs of enterprises.

[0023] In view of this, such as Figure 1As shown, some embodiments of the present invention provide a liquid ammonia pipeline venting and recovery device, including a vent valve 1, a gas-liquid separator 2, a dissolving tower 3, a reflux tank 4, an ammonia liquid storage tank 5, and an ammonia water storage tank 6; the inlet of the gas-liquid separator 2 is connected to the vent valve 1, and liquid ammonia enters the gas-liquid separator 2 through the vent valve 1; the first outlet of the gas-liquid separator 2 is connected to the ammonia liquid storage tank 5, and the first outlet of the gas-liquid separator 2 supplies liquid ammonia to the ammonia liquid storage tank 5; the second outlet of the gas-liquid separator 2 is connected to the dissolving tower 3, and the second outlet of the gas-liquid separator 2 supplies ammonia gas into the dissolving tower 3; the dissolving tower 3 is provided with cooling water for cooling the ammonia gas; the first outlet of the dissolving tower 3 is connected to the reflux tank 4, and the first outlet of the dissolving tower 3 supplies ammonia gas mixture into the reflux tank 4; the first outlet of the reflux tank 4 is connected to the dissolving tower 3, and the reflux tank 4 cools the ammonia gas mixture and discharges it into the dissolving tower 3 through the first outlet of the reflux tank 4; the second outlet of the reflux tank 4 is connected to the ammonia water storage tank 6, and the second outlet of the dissolving tower 3 is connected to the ammonia water storage tank 6.

[0024] In the above embodiment, the vent valve 1 can be connected to the liquid ammonia venting pipeline via a flange. The vent valve 1 is connected to the side wall of the gas-liquid separator 2. After the liquid ammonia passes through the vent valve 1, the pressure is reduced, causing part of the liquid ammonia to become gas, while the other part remains liquid. After the vent valve 1 is opened, ammonia gas and liquid ammonia can be discharged into the gas-liquid separator 2. Then, the gas-liquid separator 2 separates the ammonia gas and liquid ammonia. At this time, the liquid ammonia is located at the bottom of the gas-liquid separator 2 and is discharged into the ammonia storage tank 5 for storage through the first outlet at the bottom of the gas-liquid separator 2. The ammonia gas can be connected to the second outlet at the top of the gas-liquid separator 2. The ammonia gas is discharged through a pipeline into the dissolving tower 3 to contact with cooling water, thereby cooling and dissolving the ammonia gas. Some of the ammonia gas dissolves in the cooling water after cooling, and then is discharged through the second outlet of the dissolving tower 3 and transported through a pipeline to the ammonia water storage tank 6 for storage. Another part of the ammonia gas and water vapor mixture is located at the top of the dissolving tower 3. After being discharged through the first outlet of the dissolving tower 3, it enters the reflux tank 4 through a pipeline for cooling, forming a liquid ammonia mixture. Then, the liquid ammonia mixture is discharged through a pipeline to the ammonia water storage tank 6. The remaining unliquefied ammonia gas mixture re-enters the dissolving tower 3 for dissolution and cooling, thus circulating the ammonia gas mixture.

[0025] Some embodiments of the present invention provide a liquid ammonia pipeline venting and recovery device, including a vent valve 1, a gas-liquid separator 2, a dissolving tower 3, a reflux tank 4, an ammonia liquid storage tank 5, and an ammonia water storage tank 6; the inlet of the gas-liquid separator 2 is connected to the vent valve 1, and liquid ammonia enters the gas-liquid separator 2 through the vent valve 1 for separation; the first outlet of the gas-liquid separator 2 is connected to the ammonia liquid storage tank 5, and the first outlet of the gas-liquid separator 2 supplies liquid ammonia to the ammonia liquid storage tank 5 for direct storage of liquid ammonia; the second outlet of the gas-liquid separator 2 is connected to the dissolving tower 3, and the second outlet of the gas-liquid separator 2 supplies ammonia gas into the dissolving tower 3; the dissolving tower 3 is equipped with cooling water for cooling the ammonia gas; the second outlet of the dissolving tower 3... One outlet is connected to the reflux tank 4. The first outlet of the dissolving tower 3 delivers ammonia gas mixture into the reflux tank 4. The first outlet of the reflux tank 4 is connected to the dissolving tower 3. After cooling the ammonia gas mixture, the reflux tank 4 discharges it into the dissolving tower 3 through its first outlet. The second outlet of the reflux tank 4 is connected to the ammonia water storage tank 6. The second outlet of the dissolving tower 3 is also connected to the ammonia water storage tank 6. By recovering liquid ammonia, circulating, cooling, and dissolving ammonia gas, and storing it separately in the ammonia liquid storage tank 5 and the ammonia water storage tank 6, the technical problems of venting liquid ammonia in the prior art, which are very dangerous, pollute the environment, and waste resources, are solved. This achieves the technical effect of safe liquid ammonia recovery that does not pollute the environment or waste liquid ammonia.

[0026] In an optional embodiment, an ammonia condenser 7 is provided between the first outlet of the dissolving tower 3 and the reflux tank 4. The ammonia condenser 7 is connected to both the dissolving tower 3 and the reflux tank 4, and is used to condense the ammonia mixture discharged from the first outlet of the dissolving tower 3.

[0027] In the above embodiments, the ammonia condenser 7 can be a horizontal shell and tube condenser. The ammonia condenser 7 can be connected to the pipeline between the first outlet of the dissolving tower 3 and the reflux tank 4 through a flange. The ammonia condenser 7 can condense the ammonia mixture and discharge it into the reflux tank 4, so as to liquefy the ammonia and water vapor and improve the recovery efficiency.

[0028] In an optional embodiment, a first detection component 8 is also included; the first detection component 8 is disposed between the ammonia condenser 7 and the dissolving tower 3, and is connected to the dissolving tower 3 and the ammonia condenser 7 respectively. The first detection component 8 is used to detect the temperature of the ammonia mixture discharged from the first outlet of the dissolving tower 3.

[0029] In the above embodiments, the first detection component 8 can be configured as a temperature and pressure detection instrument. The first detection component 8 can be installed on the pipeline between the ammonia condenser 7 and the dissolving tower 3. The first detection component 8 is used to detect the ammonia mixture entering the ammonia condenser 7. By measuring the temperature, pressure and flow information, the refrigeration of the ammonia condenser 7 is guided, thereby improving the condensation efficiency of the ammonia condenser 7.

[0030] In an optional embodiment, an ammonia condenser 9 is provided between the second outlet of the dissolving tower 3 and the ammonia storage tank 6. The ammonia condenser 9 is connected to both the dissolving tower 3 and the ammonia storage tank 6, and is used to condense the ammonia discharged from the second outlet of the dissolving tower 3.

[0031] In the above embodiments, the ammonia condenser 9 can be a horizontal shell-and-tube condenser. The ammonia condenser 9 can be connected to the pipeline between the second outlet of the dissolving tower 3 and the ammonia storage tank 6 via a flange. The ammonia condenser 9 can condense the liquid ammonia mixture and discharge it into the ammonia storage tank 6, so as to further cool the ammonia gas and water vapor and prevent the ammonia gas from evaporating.

[0032] In an optional embodiment, a second detection component 10 is also included; the second detection component 10 is disposed between the dissolving tower 3 and the ammonia water condenser 9, and is connected to the dissolving tower 3 and the ammonia water condenser 9 respectively, and is used to detect the temperature of the ammonia water discharged from the second outlet of the dissolving tower 3.

[0033] In the above embodiments, the second detection component 10 can be configured as a temperature and pressure detection instrument. The second detection component 10 can be installed on the pipeline between the ammonia condenser 9 and the dissolving tower 3. The second detection component 10 is used to detect the liquid ammonia mixture entering the ammonia condenser 9. By measuring the temperature, pressure and flow information, the refrigeration of the ammonia condenser 9 is guided, thereby improving the condensation efficiency of the ammonia condenser 9 and further controlling the temperature of the liquid ammonia mixture.

[0034] In an optional embodiment, a level gauge 11 is provided on the gas-liquid separator 2. The level gauge 11 is connected to the gas-liquid separator 2 and is used to measure the liquid level height inside the gas-liquid separator 2.

[0035] In the above embodiment, the level gauge 11 is installed on the side wall of the gas-liquid separator 2. The level gauge 11 can display the height of liquid ammonia in the gas-liquid separator 2, thereby monitoring the amount of liquid ammonia in the gas-liquid separator 2 and avoiding excessive liquid ammonia causing the gas-liquid separator 2 to fail.

[0036] In an optional embodiment, a second valve 12 is provided between the first outlet of the gas-liquid separator 2 and the ammonia storage tank 5. The second valve 12 is connected to the gas-liquid separator 2 and the storage tank respectively, and the second valve 12 is electrically connected to the level gauge 11.

[0037] In the above embodiment, the second valve 12 can be an electrically controlled valve. After the second valve 12 is electrically connected to the level gauge 11, when the level gauge 11 reaches the threshold for discharging liquid ammonia, it can transmit an electrical signal to the second valve 12 to open the second valve 12 and transport the liquid ammonia in the gas-liquid separator 2 to the ammonia storage tank 5. When the level gauge 11 detects that the liquid level is at a low point and reaches the threshold for storage, the second valve 12 can be closed by controlling the electrical signal, so that the liquid ammonia can be stored.

[0038] In an optional embodiment, a water supply pipe 13 and a water supply pump 14 are also included. The water supply pipe 13 is connected to the water supply pump 14 and is connected to the dissolving tower 3. The water supply pump 14 supplies cooling water to the dissolving tower 3 through the water supply pipe 13.

[0039] In the above embodiment, the water supply pipe 13 can be connected to the water supply pump 14 via a flange, and the water supply pipe 13 can supply cooling water to the water supply pump 14. The water supply pump 14 can be connected to the dissolving tower 3 via a pipe, and the water supply pump 14 can supply cooling water into the dissolving tower 3, thereby cooling the ammonia gas. The water supply pump 14 can pump the cooling water into the dissolving tower 3, and the cooling water can be sprayed through multiple nozzles in the dissolving tower 3 to increase the contact area between the cooling water and the ammonia gas, thereby improving the cooling and dissolving efficiency of the ammonia gas.

[0040] In an optional embodiment, a third detection component 15 and a first valve 16 are also included; the third detection component 15 and the first valve 16 are respectively disposed between the gas-liquid separator 2 and the dissolving tower 3, and the third detection component 15 and the first valve 16 are respectively connected to the gas-liquid separator 2 and the dissolving tower 3. The third detection component 15 is used to detect the ammonia gas discharged from the second outlet of the gas-liquid separator 2, and the first valve 16 is used to control the flow rate of ammonia gas entering the dissolving tower 3.

[0041] In the above embodiment, the third detection component 15 can be configured as a temperature, pressure, and flow rate detection instrument. Both the third detection component 15 and the first valve 16 can be installed on the pipeline between the gas-liquid separator 2 and the dissolving tower 3, with the third detection component 15 close to the gas-liquid separator 2 and the first valve 16 close to the dissolving tower 3. The third detection component 15 is used to detect the ammonia gas entering the first valve 16. By measuring the temperature, pressure, and flow rate information, the opening degree of the first valve 16 is guided, thereby improving the condensation efficiency of the ammonia water condenser 9 and further controlling the temperature of the liquid ammonia mixture. At the same time, the amount and pressure of cooling water can be determined based on the ammonia gas flow rate, temperature, and pressure information. The temperature, pressure, or flow rate of the ammonia gas is directly proportional to the amount of cooling water used, thereby enabling better cooling and dissolution of the ammonia gas.

[0042] Some embodiments of the present invention also provide a working method based on a liquid ammonia pipeline venting and recovery device, including the following steps: opening the venting valve 1, allowing liquid ammonia to enter the gas-liquid separator 2 after passing through the venting valve 1, at which time, part of the liquid ammonia is vaporized into ammonia gas; controlling the opening degree of the venting valve 1 and the rotation speed of the water supply pump 14 according to the detection result of the third detection component 15, thereby controlling the ammonia gas generation rate and the liquid ammonia flow rate, and coordinating with the control of the cooling water supply speed; separating the liquid ammonia through the gas-liquid separator 2, placing the liquid ammonia at the bottom of the gas-liquid separator 2 and the ammonia gas at the top of the gas-liquid separator 2; measuring the height of the liquid ammonia in the gas-liquid separator 2 through the level gauge 11, and after the height of the liquid ammonia reaches the threshold, opening the second valve 12, allowing the liquid ammonia in the gas-liquid separator 2 to enter the ammonia liquid storage tank 5; cooling and dissolving the ammonia gas through the cooling water in the dissolution tower 3, partially dissolving the ammonia gas. Ammonia gas is dissolved in cooling water and placed at the bottom of dissolving tower 3, while another part of the ammonia gas and water vapor mixture is placed at the top of dissolving tower 3. The ammonia gas mixture is discharged from the top of dissolving tower 3 and its temperature and pressure are detected by the first detection component 8 and then transferred to the ammonia condenser 7. The ammonia condenser 7 cools the ammonia gas mixture and then discharges it into the reflux tank 4. The bottom of the reflux tank 4 stores liquid ammonia mixture. The ammonia gas mixture in the reflux tank 4 is then sent back into dissolving tower 3 by the reflux pump 17 to contact the cooling water for cooling and dissolution. The liquid ammonia mixture at the bottom of the reflux tank 4 is transported to the ammonia water storage tank 6. The liquid ammonia mixture is discharged from the bottom of dissolving tower 3 and detected by the second detection component 10. The temperature and pressure detected by the second detection component 10 are transferred to the ammonia water condenser 9. The ammonia water condenser 9 cools the liquid ammonia mixture and then transports it to the ammonia water storage tank 6.

[0043] This system also includes a third valve 18, a fourth valve 19, a fifth valve 20, a sixth valve 21, and a seventh valve 22. The third valve 18 is located between the ammonia condenser 9 and the ammonia storage tank 6, and is used to control the rate at which the ammonia condenser 9 discharges into the ammonia storage tank 6. The fourth valve 19 is located on the pipeline between the reflux tank 4 and the ammonia storage tank 6, and is used to control the rate at which the liquid ammonia mixture in the reflux tank 4 discharges into the ammonia storage tank 6. The fifth valve 20 is located on the pipeline between the reflux pump 17 and the gas-liquid separator 2, and is used to control the flow rate of the ammonia mixture pumped into the gas-liquid separator 2 by the reflux pump 17. The sixth valve 21 and the seventh valve 22 are respectively located on the water supply pipe 13, and are located on both sides of the water supply pump 14. Both the sixth valve 21 and the seventh valve 22 can be used to control the on / off state and flow rate of the cooling water.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A liquid ammonia pipeline venting and recovery device, characterized in that, This includes vent valves, gas-liquid separators, dissolving towers, reflux tanks, ammonia storage tanks, and ammonia water storage tanks; The inlet of the gas-liquid separator is connected to the vent valve, and liquid ammonia enters the gas-liquid separator through the vent valve; The first outlet of the gas-liquid separator is connected to the ammonia storage tank, and the first outlet of the gas-liquid separator supplies liquid ammonia to the ammonia storage tank. The second outlet of the gas-liquid separator is connected to the dissolving tower, and the second outlet of the gas-liquid separator supplies ammonia gas into the dissolving tower. The dissolving tower is equipped with cooling water for cooling the ammonia gas. The first outlet of the dissolving tower is connected to the reflux tank. The first outlet of the dissolving tower supplies ammonia gas mixture into the reflux tank. The first outlet of the reflux tank is connected to the dissolving tower. The reflux tank cools the ammonia gas mixture and then discharges it into the dissolving tower through the first outlet of the reflux tank. The second outlet of the reflux tank is connected to the ammonia storage tank, and the second outlet of the dissolving tower is connected to the ammonia storage tank.

2. The liquid ammonia pipeline venting and recovery device according to claim 1, characterized in that, An ammonia condenser is provided between the first outlet of the dissolving tower and the reflux tank. The ammonia condenser is connected to both the dissolving tower and the reflux tank and is used to condense the ammonia mixture discharged from the first outlet of the dissolving tower.

3. The liquid ammonia pipeline venting and recovery device according to claim 2, characterized in that, It also includes the first detection component; The first detection component is disposed between the ammonia condenser and the dissolving tower. The first detection component is connected to both the dissolving tower and the ammonia condenser. The first detection component is used to detect the temperature of the ammonia mixture discharged from the first outlet of the dissolving tower.

4. The liquid ammonia pipeline venting and recovery device according to claim 1, characterized in that, An ammonia condenser is provided between the second outlet of the dissolving tower and the ammonia storage tank. The ammonia condenser is connected to both the dissolving tower and the ammonia storage tank and is used to condense the ammonia discharged from the second outlet of the dissolving tower.

5. The liquid ammonia pipeline venting and recovery device according to claim 4, characterized in that, It also includes a second detection component; The second detection component is disposed between the dissolving tower and the ammonia water condenser. The second detection component is connected to both the dissolving tower and the ammonia water condenser. The second detection component is used to detect the temperature of the ammonia water discharged from the second outlet of the dissolving tower.

6. The liquid ammonia pipeline venting and recovery device according to claim 1, characterized in that, The gas-liquid separator is equipped with a level gauge, which is connected to the gas-liquid separator and is used to measure the liquid level height inside the gas-liquid separator.

7. The liquid ammonia pipeline venting and recovery device according to claim 6, characterized in that, A second valve is provided between the first outlet of the gas-liquid separator and the ammonia storage tank. The second valve is connected to both the gas-liquid separator and the storage tank, and is also connected to the liquid level gauge via an electrical signal.

8. The liquid ammonia pipeline venting and recovery device according to claim 1, characterized in that, It also includes a water supply pipe and a water supply pump, the water supply pipe being connected to the water supply pump and the water supply pipe being connected to the dissolving tower, and the water supply pump supplying cooling water to the dissolving tower through the water supply pipe.

9. The liquid ammonia pipeline venting and recovery device according to claim 1, characterized in that, It also includes a third detection component and a first valve; The third detection component and the first valve are respectively disposed between the gas-liquid separator and the dissolving tower. The third detection component and the first valve are respectively connected to the gas-liquid separator and the dissolving tower. The third detection component is used to detect the ammonia gas discharged from the second outlet of the gas-liquid separator, and the first valve is used to control the flow rate of ammonia gas entering the dissolving tower.

10. A method for operating a liquid ammonia pipeline venting and recovery device based on any one of claims 1-9, characterized in that, Includes the following steps: Open the vent valve to allow liquid ammonia to pass through the vent valve and enter the gas-liquid separator; The opening degree of the vent valve and the speed of the water supply pump are controlled based on the detection results of the third detection component. The liquid ammonia is separated by a gas-liquid separator, with the liquid ammonia at the bottom and the gas ammonia at the top. The liquid ammonia level in the gas-liquid separator is measured by a level gauge. Once the liquid ammonia level reaches the threshold, the second valve is opened to allow the liquid ammonia in the gas-liquid separator to enter the ammonia storage tank. Ammonia gas is cooled by cooling water in the dissolving tower. Part of the ammonia gas is dissolved in the cooling water and placed at the bottom of the dissolving tower, while the other part of the ammonia gas mixed with water vapor is placed at the top of the dissolving tower. The ammonia mixture is discharged from the top of the dissolving tower and then transferred to the ammonia condenser after the temperature and pressure are detected by the first detection component. The ammonia condenser cools the ammonia mixture and then discharges it into the reflux tank. Liquid ammonia mixture is stored at the bottom of the reflux tank. The ammonia mixture in the reflux tank is once again pumped back into the dissolving tower to come into contact with the cooling water. The liquid ammonia mixture at the bottom of the reflux tank is transferred to the ammonia storage tank; After the liquid ammonia mixture is discharged from the bottom of the dissolving tower, it is detected by the second detection component. The temperature and pressure detected by the second detection component are transmitted to the ammonia water condenser. The ammonia water condenser cools the liquid ammonia mixture and then transports it to the ammonia water storage tank.

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