Liquid ammonia tank car unloading and supply system

Abstract

The application provides a liquid ammonia tank car ammonia unloading and supplying system, which comprises a tank car storage tank, an evaporation tank, a booster pump, an ammonia gas supplying pipeline, a condensing device and a condensing recovery tank; the liquid ammonia outlet of the tank car storage tank is communicated with the inlet of the evaporation tank; the ammonia gas outlet of the evaporation tank is communicated with the ammonia gas supplying pipeline, the inlet of the condensing device and the inlet of the booster pump respectively; the outlet of the booster pump is communicated with the ammonia gas inlet of the tank car storage tank; the outlet of the condensing device is communicated with the inlet of the condensing recovery tank; and the outlet of the condensing recovery tank is communicated with the inlet of the evaporation tank. The liquid ammonia tank car ammonia unloading and supplying system can more stably and efficiently unload ammonia.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid ammonia tank car unloading ammonia, in particular to a liquid ammonia tank car unloading ammonia supply system. BACKGROUND

[0002] Ultra-pure ammonia is the main preparation material of microelectronic silicon nitride and gallium nitride mask film, and is an important raw material in the fields of optoelectronics, semiconductors, and light-emitting diode industries. It is widely used in liquid crystal panels, photovoltaic optical fibers, LEDs, integrated circuits, and other fields. The purity of ultra-pure ammonia has a direct impact on the service life of device products, the electrical and optical properties of materials, and therefore the production process, filling process, and transportation process of ultra-pure ammonia need to be strictly controlled for impurity pollution, air tightness, and other factors to ensure the purity of ultra-pure ammonia.

[0003] In the prior art, the unloading of liquid ammonia from the liquid ammonia tank car (i.e., the unloading of liquid ammonia in the liquid ammonia tank car into the liquid ammonia storage tank) is mainly achieved by extracting ammonia gas from the liquid ammonia storage tank through the unloading compressor, and then the ammonia gas is compressed by the unloading compressor and discharged into the liquid ammonia tank car, thereby forming a certain pressure difference between the liquid ammonia storage tank and the liquid ammonia tank car (when the unloading compressor pressurizes and transports the ammonia gas in the liquid ammonia storage tank into the liquid ammonia tank car, the pressure in the liquid ammonia storage tank decreases, and the pressure in the liquid ammonia tank car increases), and then the liquid ammonia in the liquid ammonia tank car is squeezed into the liquid ammonia storage tank, achieving the unloading of the liquid ammonia tank car.

[0004] However, during the unloading of the liquid ammonia tank car, as the amount of liquid ammonia in the liquid ammonia tank car decreases and the amount of liquid ammonia in the liquid ammonia storage tank increases, the pressure in the liquid ammonia storage tank increases, and the amount of ammonia gas in the liquid ammonia storage tank also decreases, making it difficult for the unloading compressor to extract enough ammonia gas, thereby causing difficulty in unloading ammonia (especially in winter when the temperature is low, the amount of ammonia gas produced in the liquid ammonia storage tank decreases). SUMMARY

[0005] The purpose of the present application is to provide a liquid ammonia tank car unloading ammonia supply system that can more stably and efficiently unload ammonia.

[0006] The present application provides a liquid ammonia tank car unloading ammonia supply system, comprising a tank car storage tank, an evaporation tank, a booster pump, an ammonia gas supply pipeline, a condensing device, and a condensing recovery tank; the liquid ammonia outlet of the tank car storage tank is in communication with the inlet of the evaporation tank, the ammonia gas outlet of the evaporation tank is in communication with the ammonia gas supply pipeline, the inlet of the condensing device, and the inlet of the booster pump, respectively, and the outlet of the booster pump is in communication with the ammonia gas inlet of the tank car storage tank; the outlet of the condensing device is in communication with the inlet of the condensing recovery tank, and the outlet of the condensing recovery tank is in communication with the inlet of the evaporation tank.

[0007] Further, the ammonia gas supply pipeline is provided with an adsorption device for adsorbing and purifying ammonia gas.

[0008] Further, the liquid ammonia tank car unloading ammonia supply system further comprises an ammonia gas analysis system connected with the evaporation tank, and the ammonia gas analysis system is used for purity analysis of ammonia gas.

[0009] Further, the liquid ammonia tank car unloading ammonia supply system further comprises a first self-pressurizing pipeline, one end of the first self-pressurizing pipeline is in communication with the outlet of the booster pump, and the other end of the first self-pressurizing pipeline is in communication with the pipeline between the liquid ammonia outlet of the tank car storage tank and the inlet of the evaporation tank.

[0010] Further, the liquid ammonia tank car unloading ammonia supply system further comprises a second self-pressurizing pipeline, one end of the second self-pressurizing pipeline is in communication with the pipeline between the outlet of the booster pump and the ammonia gas inlet of the tank car storage tank, and the other end of the second self-pressurizing pipeline is in communication with the pipeline between the liquid ammonia outlet of the tank car storage tank and the inlet of the evaporation tank.

[0011] Further, the liquid ammonia tank car unloading ammonia supply system further comprises a waste gas and waste liquid treatment device, which is in communication with the pipeline between the ammonia gas outlet of the evaporation tank and the inlet of the booster pump, the pipeline between the outlet of the booster pump and the ammonia gas inlet of the tank car storage tank, the pipeline between the liquid ammonia outlet of the tank car storage tank and the inlet of the evaporation tank, and the outlet of the evaporation tank.

[0012] Further, the liquid ammonia tank car unloading ammonia supply system further comprises a waste liquid recovery tank, the liquid ammonia outlet of the evaporation tank is in communication with the inlet of the waste liquid recovery tank through a liquid discharge pipeline, and the outlet of the waste liquid recovery tank is in communication with the inlet of the condensing device.

[0013] Further, the number of the evaporation tanks is at least two, and the at least two evaporation tanks are arranged in parallel, and the liquid ammonia outlets of the at least two evaporation tanks are in communication with the liquid discharge pipeline; a buffer tank and a liquid discharge pump are sequentially arranged on the liquid discharge pipeline, and the liquid discharge pump is located between the buffer tank and the waste liquid recovery tank.

[0014] Further, the liquid ammonia tank car unloading ammonia supply system further comprises a bypass pipeline, one end of the bypass pipeline is in communication with the liquid discharge pipeline, and the other end of the bypass pipeline is in communication with the pipeline between the outlet of the waste liquid recovery tank and the inlet of the condensing device.

[0015] Further, the liquid ammonia tank car unloading ammonia supply system further comprises a condensing pipeline, one end of the condensing pipeline is in communication with the pipeline between the ammonia gas outlet of the evaporation tank and the inlet of the booster pump, and the other end of the condensing pipeline is in communication with the inlet of the condensing device.

[0016] Further, the liquid ammonia tank truck ammonia unloading and supply system further comprises a nitrogen purging system and a purging exhaust pipeline, an outlet of the nitrogen purging system is communicated with a pipeline between an outlet of the booster pump and an ammonia gas inlet of the tank truck storage tank, and the purging exhaust pipeline is communicated with the evaporation tank.

[0017] The liquid ammonia tank truck ammonia unloading and supply system provided by the present application can realize stable and efficient unloading of ammonia in the tank truck storage tank under the action of pressure difference, and is not affected by external environmental factors. Meanwhile, the ammonia gas generated by heating and evaporation of the evaporation tank can directly enter the ammonia gas supply pipeline to supply ammonia gas to process machines or gas using equipment, without the need for temporary storage in the liquid ammonia storage tank, thereby saving the equipment cost of the liquid ammonia storage tank and the energy consumption required for heating and evaporation of the liquid ammonia in the liquid ammonia storage tank (at present, the liquid ammonia in the liquid ammonia tank truck is generally unloaded into the liquid ammonia storage tank, and then the liquid ammonia in the liquid ammonia storage tank is heated to generate ammonia gas), and then supplied to process machines or gas using equipment, thereby saving cost.

[0018] Moreover, the evaporation tank can preliminarily purify the liquid ammonia (i.e. according to different vaporization temperatures, ammonia gas can be smoothly evaporated, while part of impurities cannot be evaporated) during the process of heating and evaporation of the liquid ammonia to generate ammonia gas, so as to improve the purity of the ammonia gas. Meanwhile, by arranging a condensing device and a condensing recovery tank, the condensing device can condense and recover the excess ammonia gas in the evaporation tank, thereby reducing the pressure in the evaporation tank and avoiding overpressure of the evaporation tank; the liquid ammonia generated by condensation of the condensing device can enter the condensing recovery tank, and then reenter the evaporation tank for repeated use, so as to avoid waste of ammonia and improve the economy of the system. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 1 is a structural schematic diagram of a liquid ammonia tank truck ammonia unloading and supply system in an embodiment of the present application.

[0020] Figure 2 FIG. 2 is a structural schematic diagram of a liquid ammonia tank truck ammonia unloading and supply system in another embodiment of the present application.

[0021] Figure 3 FIG. 3 is a structural schematic diagram of an evaporation tank in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The specific embodiments of the present application will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0023] The terms "first", "second", "third", "fourth" and the like in the description and claims of the application are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.

[0024] As shown in Figure 1 and Figure 3 The liquid ammonia tank car unloading ammonia supply system provided by the embodiment of the application includes a tank car storage tank 11 (i.e. a storage tank on a liquid ammonia tank car), an evaporation tank 12, a booster pump 13, an ammonia gas supply pipeline 14, a condensing device 15 and a condensing recovery tank 16. The tank car storage tank 11 is used for storing liquid ammonia. The liquid ammonia outlet of the tank car storage tank 11 is in communication with the inlet of the evaporation tank 12. The ammonia gas outlet of the evaporation tank 12 is in communication with the inlet of the condensing device 15, the inlet of the booster pump 13 and the ammonia gas supply pipeline 14, respectively. The outlet of the booster pump 13 is in communication with the ammonia gas inlet of the tank car storage tank 11. The ammonia gas supply pipeline 14 is used for connecting with a process machine or a gas using device (not shown in the figure) to supply ammonia gas thereto. The outlet of the condensing device 15 is in communication with the inlet of the condensing recovery tank 16. The outlet of the condensing recovery tank 16 is in communication with the inlet of the evaporation tank 12.

[0025] Specifically, when the liquid ammonia tank car is unloading ammonia, the evaporation tank 12 heats the liquid ammonia in the evaporation tank 12 to make the liquid ammonia evaporate to generate ammonia gas. The ammonia gas enters the tank car storage tank 11 after being pressurized by the booster pump 13, so as to pressurize the tank car storage tank 11. The liquid ammonia in the tank car storage tank 11 is squeezed into the evaporation tank 12, so as to realize stable and efficient unloading of the tank car storage tank 11. The liquid ammonia entering the evaporation tank 12 can be heated and evaporated by the evaporation tank 12. When ammonia gas is supplied, the ammonia gas in the evaporation tank 12 enters the ammonia gas supply pipeline 14 and reaches the process machine or the gas using device to supply ammonia gas. Meanwhile, when the unloading / supplying is finished or the ammonia gas in the evaporation tank 12 is excessive, the ammonia gas can enter the condensing device 15 to be condensed, and the pressure in the evaporation tank 12 is reduced. The liquid ammonia generated by condensation is recovered into the condensing recovery tank 16. The liquid ammonia in the condensing recovery tank 16 can enter the evaporation tank 12 again to be reused.

[0026] The liquid ammonia tank car unloading ammonia supply system provided by the embodiment can realize stable and efficient unloading of the ammonia in the tank car storage tank 11, and is not affected by external environmental factors. At the same time, the ammonia gas generated by the evaporation tank 12 can directly enter the ammonia gas supply pipeline 14 to supply ammonia gas to the process machine or gas equipment, without the need for temporary storage in the liquid ammonia storage tank, saving the equipment cost of the liquid ammonia storage tank and the energy consumption required for heating and evaporating the liquid ammonia in the liquid ammonia storage tank again (at present, the liquid ammonia in the liquid ammonia tank car is generally unloaded into the liquid ammonia storage tank, and then the liquid ammonia in the liquid ammonia storage tank is heated to generate ammonia gas, which is then supplied to the process machine or gas equipment), thereby saving costs.

[0027] Moreover, in the process of heating and evaporating the liquid ammonia to generate ammonia gas, the evaporation tank 12 can preliminarily purify the liquid ammonia (i.e., according to the different evaporation temperatures, the ammonia gas can be evaporated smoothly, while part of the impurities cannot be evaporated), so as to improve the purity of the ammonia gas. At the same time, by arranging the condensing device 15 and the condensing recovery tank 16, the condensing device 15 can condense and recover the excess ammonia gas in the evaporation tank 12, thereby reducing the pressure in the evaporation tank 12 and avoiding overpressure of the evaporation tank 12; the liquid ammonia generated by the condensing device 15 can enter the condensing recovery tank 16 and then be reused in the evaporation tank 12, so as to avoid waste of ammonia and improve the economy of the system.

[0028] As shown in Figure 1 As an embodiment, the liquid ammonia tank car unloading ammonia supply system further comprises a condensing pipeline 25, one end of the condensing pipeline 25 is in communication with the pipeline between the ammonia gas outlet of the evaporation tank 12 and the inlet of the booster pump 13, and the other end of the condensing pipeline 25 is in communication with the inlet of the condensing device 15. The ammonia gas in the pipeline between the ammonia gas outlet of the evaporation tank 12 and the inlet of the booster pump 13 can enter the condensing device 15 for condensing and recovery, and reduce the pressure in the pipeline.

[0029] As shown in Figure 1 As an embodiment, the ammonia gas supply pipeline 14 is provided with an adsorption device 141 for adsorbing and purifying the ammonia gas.

[0030] Specifically, after the ammonia gas is preliminarily purified by the evaporation tank 12, the adsorption device 141 can adsorb and purify the ammonia gas again to improve the purity of the ammonia gas. The adsorption device 141 can be a molecular sieve adsorption device, which not only has high purification accuracy and good adsorption effect, but also has small size. However, the existing liquid ammonia tank car unloading ammonia supply system does not purify the unloaded liquid ammonia.

[0031] As shown in Figure 1 one embodiment, the liquid ammonia tank truck unloading ammonia supply system further comprises an ammonia gas analysis system 17 connected to the evaporation tank 12.

[0032] Specifically, the ammonia gas analysis system 17 is used for purity analysis of ammonia gas, to determine the concentration of ammonia and the type of impurities, so as to determine whether it meets the use standard; the ammonia gas in the evaporation tank 12 can enter the ammonia gas analysis system 17 for purity analysis (it should be noted that the ammonia gas analysis system 17 can only analyze the purity of gaseous ammonia, and cannot analyze the purity of liquid ammonia). The ammonia gas in the evaporation tank 12 is analyzed by the ammonia gas analysis system 17 to determine whether it is usable; when the ammonia gas analysis system 17 determines that the purity of ammonia in the evaporation tank 12 is qualified, the ammonia gas in the evaporation tank 12 is discharged to the ammonia gas supply pipeline 14; when the ammonia gas analysis system 17 determines that the purity of ammonia in the evaporation tank 12 is unqualified, the ammonia in the evaporation tank 12 is recovered or discharged. The existing liquid ammonia tank truck unloading ammonia supply system does not detect the purity of the unloaded liquid ammonia.

[0033] As shown in Figure 1 one embodiment, the liquid ammonia tank truck unloading ammonia supply system further comprises a first self-pressurizing pipeline 21, one end of the first self-pressurizing pipeline 21 is in communication with the outlet of the booster pump 13, and the other end of the first self-pressurizing pipeline 21 is in communication with the pipeline between the liquid ammonia outlet of the tank truck storage tank 11 and the inlet of the evaporation tank 12. The first self-pressurizing pipeline 21 is used for self-pressurizing the evaporation tank 12.

[0034] As shown in Figure 1 one embodiment, the liquid ammonia tank truck unloading ammonia supply system further comprises a second self-pressurizing pipeline 22, one end of the second self-pressurizing pipeline 22 is in communication with the pipeline between the outlet of the booster pump 13 and the ammonia gas inlet of the tank truck storage tank 11, and the other end of the second self-pressurizing pipeline 22 is in communication with the pipeline between the liquid ammonia outlet of the tank truck storage tank 11 and the inlet of the evaporation tank 12. The second self-pressurizing pipeline 22 is used for self-pressurizing the tank truck storage tank 11.

[0035] Specifically, in the embodiment, a first control valve 61 is arranged on the pipeline between the ammonia gas outlet of the evaporation tank 12 and the inlet of the booster pump 13; a second control valve 62 is arranged on the pipeline between the outlet of the booster pump 13 and the ammonia gas inlet of the tank car storage tank 11; a third control valve 63 and a fourth control valve 64 are arranged in sequence on the pipeline between the liquid ammonia outlet of the tank car storage tank 11 and the inlet of the evaporation tank 12, and the first self-boosting pipeline 21 is communicated with the pipeline between the third control valve 63 and the fourth control valve 64; the fifth control valve 65 is arranged on the first self-boosting pipeline 21; and the sixth control valve 66 is arranged on the second self-boosting pipeline 22. When the pressure in the evaporation tank 12 is insufficient, the first control valve 61, the fourth control valve 64 and the fifth control valve 65 can be opened, and the second control valve 62 and the third control valve 63 can be closed, so that the ammonia gas generated in the evaporation tank 12 is circulated back into the evaporation tank 12 through the first self-boosting pipeline 21 after being pressurized by the booster pump 13, thereby accelerating the pressure rise of the evaporation tank 12, and thus realizing the automatic boosting of the evaporation tank 12; when the pressure in the tank car storage tank 11 is insufficient, the sixth control valve 66 can be opened, and the second control valve 62 and the third control valve 63 can be closed, so that the ammonia gas is circulated in the tank car storage tank 11 and the second self-boosting pipeline 22, thereby realizing the automatic boosting of the tank car storage tank 11. Through the pressure rise of the evaporation tank 12 and the tank car storage tank 11, the liquid ammonia in the tank car storage tank 11 can be smoothly squeezed into the evaporation tank 12.

[0036] As shown in Figure 1 As an embodiment, the liquid ammonia tank car ammonia unloading and supply system further comprises a waste gas and liquid treatment device 18, which is communicated with the pipeline between the ammonia gas outlet of the evaporation tank 12 and the inlet of the booster pump 13, the pipeline between the outlet of the booster pump 13 and the ammonia gas inlet of the tank car storage tank 11, the pipeline between the liquid ammonia outlet of the tank car storage tank 11 and the inlet of the evaporation tank 12, and the outlet of the evaporation tank 12, respectively, and is used for treating the ammonia gas or liquid ammonia discharged from each pipeline and device.

[0037] Specifically, in the embodiment, the waste gas and liquid treatment device 18 is communicated with the pipeline between the ammonia gas outlet of the evaporation tank 12 and the inlet of the booster pump 13, the pipeline between the outlet of the booster pump 13 and the ammonia gas inlet of the tank car storage tank 11, the pipeline between the liquid ammonia outlet of the tank car storage tank 11 and the inlet of the evaporation tank 12, and the outlet of the evaporation tank 12 through two branch pipelines (not numbered in the figure), respectively, one of the branch pipelines is provided with a safety relief valve 31, and the other branch pipeline is provided with a control valve (not numbered in the figure). When the pipeline or device is over-pressured, the ammonia gas or liquid ammonia can be passively discharged to the waste gas and liquid treatment device 18 through the safety relief valve 31, or actively discharged to the waste gas and liquid treatment device 18 through the control valve.

[0038] As shown in Figure 1As shown, in one embodiment, the liquid ammonia tanker unloading and supply system also includes an exhaust device 20, which is connected to the ammonia outlet of the evaporator 12. This exhaust device 20 is used to urgently discharge ammonia to the atmosphere when the evaporator 12 is overpressurized, preventing the pressure from increasing indefinitely and ensuring safety. A safety pressure relief valve 31 is also provided on the pipeline between the exhaust device 20 and the evaporator 12. In other embodiments, the exhaust device 20 is also connected to the pipeline between the ammonia outlet of the evaporator 12 and the inlet of the booster pump 13, and the pipeline between the outlet of the booster pump 13 and the ammonia inlet of the tanker 11, respectively, to provide emergency pressure relief when the pipeline is overpressurized.

[0039] like Figure 1 As shown, in one embodiment, the liquid ammonia tanker unloading and supply system also includes a waste liquid recovery tank 19. The liquid ammonia outlet of the evaporator 12 is connected to the inlet of the waste liquid recovery tank 19 via a drain pipe 23, and the outlet of the waste liquid recovery tank 19 is connected to the inlet of the condenser 15. The waste liquid recovery tank 19 is used to recover the liquid ammonia in the evaporator 12. When the evaporator 12 stops working (or when the ammonia purity in the evaporator 12 is too low, etc.), the excess liquid ammonia in the evaporator 12 can be discharged into the waste liquid recovery tank 19 for temporary storage. The liquid ammonia in the waste liquid recovery tank 19 can either be reused by passing through the condenser 15 and the condensation recovery tank 16 and then re-entering the evaporator 12, or the waste liquid recovery tank 19 can be treated separately (e.g., transported to other applications).

[0040] like Figure 1 As shown, in one embodiment, the liquid ammonia tanker unloading and supply system also includes a bypass pipeline 24. One end of the bypass pipeline 24 is connected to the drain pipeline 23, and the other end of the bypass pipeline 24 is connected to the pipeline between the outlet of the waste liquid recovery tank 19 and the inlet of the condensation device 15. Specifically, when the waste liquid recovery tank 19 is transported away (for example, transported to another application site), the control valve on the bypass pipeline 24 can be opened to allow the liquid ammonia in the evaporator 12 to flow directly to the condensation device 15 through the bypass pipeline 24 and be temporarily stored in the condensation recovery tank 16 for reuse.

[0041] like Figure 1 As shown, in one embodiment, the number of evaporators 12 is one.

[0042] like Figure 2As another embodiment, as shown in the figure, the number of evaporation tanks 12 is at least two (two are shown in the figure), the at least two evaporation tanks 12 are connected in parallel, and the liquid ammonia outlets of the at least two evaporation tanks 12 are connected to the liquid discharge pipeline 23 (at this time, the ammonia gas generated by one of the evaporation tanks 12 can be selected to flow back to the tank truck storage tank 11 for ammonia unloading). The liquid discharge pipeline 23 is sequentially provided with a buffer tank 41 and a liquid discharge pump 42, and the liquid discharge pump 42 is located between the buffer tank 41 and the waste liquid recovery tank 19. When multiple evaporation tanks 12 simultaneously discharge liquid to the waste liquid recovery tank 19, the liquid ammonia in the multiple evaporation tanks 12 can be first discharged to the buffer tank 41 to play a buffering role, and then accelerated by the liquid discharge pump 42 to the waste liquid recovery tank 19. In this way, it can prevent damage to the pipeline caused by the pressure difference of each evaporation tank 12 when multiple evaporation tanks 12 simultaneously discharge liquid.

[0043] As shown in the figure, Figure 1 As an embodiment, the liquid ammonia tank truck ammonia unloading and supply system further comprises a nitrogen purging system 51 and a purging exhaust pipeline 52. The outlet of the nitrogen purging system 51 is connected to the pipeline between the outlet of the booster pump 13 and the ammonia gas inlet of the tank truck storage tank 11, and the purging exhaust pipeline 52 is connected to the evaporation tank 12. The nitrogen purging system 51 is used for purging the entire system (including the tank truck storage tank 11, the evaporation tank 12, and related pipelines and valves, etc.) with nitrogen (i.e., the nitrogen purging system 51 is used to output nitrogen, and the system is purged with nitrogen), and can also be used for pressure maintenance testing of the system (i.e., nitrogen is filled into the system, then the related valves are closed, and the pressure of the system is detected to determine the air tightness of the system); the purging or pressure maintenance nitrogen is discharged through the purging exhaust pipeline 52.

[0044] As shown in the figure, Figure 3 As an embodiment, the liquid ammonia tank truck ammonia unloading and supply system further comprises a heat source device 122, and the evaporation tank 12 is provided with a heat exchange coil 121. The heat source device 122 is connected to the heat exchange coil 121 to heat the heat exchange coil 121, thereby heating the liquid ammonia in the evaporation tank 12. The heat source device 122 can be a hot water supply device, thereby supplying hot water to the heat exchange coil 121 to heat the liquid ammonia in the evaporation tank 12 by water bath heating.

[0045] As shown in the figure, Figure 3 As an embodiment, the evaporation tank 12 is provided with a pressure sensor 71 and a liquid level sensor 72 to monitor the pressure and liquid level in the evaporation tank 12.

[0046] As shown in the figure, Figure 1 As an embodiment, control valves, pressure sensors, etc. are provided on each pipeline and device, which are not described here.

[0047] As shown in the figure, Figure 1 As an embodiment, the working process of the liquid ammonia tank truck ammonia unloading and supply system is as follows:

[0048] 1. During the unloading of liquid ammonia from the tank truck, the evaporator 12 heats the liquid ammonia within it to evaporate and produce ammonia gas. The ammonia gas is then pressurized by the booster pump 13 and enters the tank truck storage tank 11, thereby pressurizing the tank truck storage tank 11 and forcing the liquid ammonia within it into the evaporator 12. This ensures stable and efficient unloading of ammonia from the tank truck storage tank 11. The liquid ammonia is then heated and evaporated within the evaporator 12. Simultaneously, the ammonia gas in the evaporator 12 enters the ammonia supply pipeline 14, where it is further purified by the adsorption device 141 before reaching the process equipment or gas-using equipment for ammonia supply. During the gas supply process, the ammonia analysis system 17 analyzes the purity of the ammonia gas to ensure that the purity meets usable standards.

[0049] 2. When the ammonia unloading / gas supply is completed or when there is too much ammonia in the evaporator 12 / pipeline, the ammonia can enter the condensation device 15 for condensation and reduce the pressure in the evaporator 12. The liquid ammonia produced by condensation is recovered to the condensation recovery tank 16. The liquid ammonia in the condensation recovery tank 16 can re-enter the evaporator 12 for reuse.

[0050] 3. When the evaporator 12 stops working (or when the ammonia purity in the evaporator 12 is too low, etc.), the excess liquid ammonia in the evaporator 12 can be discharged into the waste liquid recovery tank 19 for temporary storage. The liquid ammonia in the waste liquid recovery tank 19 can either be reused by passing through the condenser 15 and the condensation recovery tank 16 and then re-entering the evaporator 12, or the waste liquid recovery tank 19 can be treated separately (for example, transporting the waste liquid recovery tank 19 to other applications).

[0051] 4. Before and / or after the ammonia unloading / gas supply begins, the entire system or individual device is purged with nitrogen using the nitrogen purging system 51, or a pressure holding test is performed; the purging or pressure holding nitrogen is discharged through the purging exhaust pipe 52.

[0052] The liquid ammonia tank car unloading ammonia supply system provided by the embodiment of the application, by setting the evaporation tank 12 and the booster pump 13, the evaporation tank 12 can heat and evaporate the liquid ammonia to generate ammonia gas, the ammonia gas generated by the evaporation tank 12 is pressurized by the booster pump 13 and then delivered to the tank car storage tank 11, so that the pressure in the tank car storage tank 11 increases, and then the liquid ammonia in the tank car storage tank 11 is squeezed into the evaporation tank 12 under the action of the pressure difference, realizing stable and efficient unloading of the tank car storage tank 11, and not affected by external environmental factors. At the same time, the ammonia gas generated by the evaporation tank 12 can directly enter the ammonia gas supply pipeline 14 to supply ammonia gas to the process machine or gas equipment, without temporary storage in the liquid ammonia storage tank, saving the equipment cost of the liquid ammonia storage tank and the energy consumption required for heating and evaporating the liquid ammonia in the liquid ammonia storage tank again (at present, the liquid ammonia in the liquid ammonia tank car is generally unloaded into the liquid ammonia storage tank, and then the liquid ammonia in the liquid ammonia storage tank is heated to generate ammonia gas, which is then supplied to the process machine or gas equipment), saving cost.

[0053] Moreover, in the process of heating and evaporating the liquid ammonia to generate ammonia gas, the evaporation tank 12 can preliminarily purify the liquid ammonia (i.e. according to the different evaporation temperatures, the ammonia gas can be evaporated smoothly, and part of the impurities cannot be evaporated), so as to improve the purity of the ammonia gas. At the same time, by setting the condensing device 15 and the condensing recovery tank 16, the condensing device 15 can condense and recover the excess ammonia gas in the evaporation tank 12, thereby reducing the pressure in the evaporation tank 12 and avoiding overpressure of the evaporation tank 12; the liquid ammonia generated by the condensing device 15 can enter the condensing recovery tank 16 and then enter the evaporation tank 12 again for repeated use, so as to avoid waste of ammonia and improve the economy of the system.

[0054] The above is only a specific embodiment of the application, but the protection scope of the application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the application, which should be covered within the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A liquid ammonia tanker unloading and supply system, characterized in that, The system includes a tank truck storage tank (11), an evaporator (12), a booster pump (13), an ammonia supply pipeline (14), a condenser (15), and a condensate recovery tank (16). The liquid ammonia outlet of the tank truck storage tank (11) is connected to the inlet of the evaporator (12). The ammonia outlet of the evaporator (12) is connected to the inlet of the ammonia supply pipeline (14), the inlet of the condenser (15), and the inlet of the booster pump (13). The outlet of the booster pump (13) is connected to the outlet of the tank truck storage tank (11). The ammonia inlet is connected; the outlet of the condensing device (15) is connected to the inlet of the condensation recovery tank (16), and the outlet of the condensation recovery tank (16) is connected to the inlet of the evaporator (12); the liquid ammonia tanker unloading ammonia supply system also includes a condensing pipeline (25), one end of which is connected to the pipeline between the ammonia outlet of the evaporator (12) and the inlet of the booster pump (13), and the other end of which is connected to the inlet of the condensing device (15).

2. The liquid ammonia tanker unloading and supply system as described in claim 1, characterized in that, The ammonia supply pipeline (14) is equipped with an adsorption device (141) for adsorbing and purifying ammonia.

3. The liquid ammonia tanker unloading and supply system as described in claim 1, characterized in that, The liquid ammonia tanker unloading ammonia supply system also includes an ammonia analysis system (17), which is connected to the evaporator (12) and is used to analyze the purity of ammonia.

4. The liquid ammonia tanker unloading and supply system as described in claim 1, characterized in that, The liquid ammonia tanker unloading ammonia supply system also includes a first self-pressurizing pipeline (21), one end of which is connected to the outlet of the booster pump (13), and the other end of which is connected to the pipeline between the liquid ammonia outlet of the tanker storage tank (11) and the inlet of the evaporator (12).

5. The liquid ammonia tanker unloading and supply system as described in claim 1, characterized in that, The liquid ammonia tanker unloading ammonia supply system also includes a second self-pressurizing pipeline (22), one end of which is connected to the pipeline between the outlet of the booster pump (13) and the ammonia inlet of the tanker (11), and the other end of which is connected to the pipeline between the liquid ammonia outlet of the tanker (11) and the inlet of the evaporator (12).

6. The liquid ammonia tanker unloading and supply system as described in claim 1, characterized in that, The liquid ammonia tanker unloading ammonia supply system also includes a waste gas and waste liquid treatment device (18), which is connected to the pipeline between the ammonia outlet of the evaporator (12) and the inlet of the booster pump (13), the pipeline between the outlet of the booster pump (13) and the ammonia inlet of the tanker storage tank (11), the pipeline between the liquid ammonia outlet of the tanker storage tank (11) and the inlet of the evaporator (12), and the outlet of the evaporator (12).

7. The liquid ammonia tanker unloading and supply system as described in claim 1, characterized in that, The liquid ammonia tanker unloading and supply system also includes a waste liquid recovery tank (19). The liquid ammonia outlet of the evaporator (12) is connected to the inlet of the waste liquid recovery tank (19) through a drain pipe (23). The outlet of the waste liquid recovery tank (19) is connected to the inlet of the condensation device (15).

8. The liquid ammonia tanker unloading and supply system as described in claim 7, characterized in that, The liquid ammonia tanker unloading ammonia supply system also includes a bypass pipeline (24), one end of which is connected to the drain pipeline (23), and the other end of which is connected to the pipeline between the outlet of the waste liquid recovery tank (19) and the inlet of the condensation device (15).

9. The liquid ammonia tanker unloading and supply system as described in any one of claims 1-8, characterized in that, The liquid ammonia tanker unloading ammonia supply system also includes a nitrogen purging system (51) and a purging exhaust pipe (52). The outlet of the nitrogen purging system (51) is connected to the pipeline between the outlet of the booster pump (13) and the ammonia inlet of the tanker storage tank (11). The purging exhaust pipe (52) is connected to the evaporator (12).

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