Cold storage working medium unloading and pretreatment system and method

Abstract

The invention relates to a cold storage working medium unloading and pretreatment system and method.The system comprises an unloading subsystem and a pretreatment subsystem, and the unloading subsystem comprises an unloading compressor, an unloading gas phase pipeline, an unloading liquid phase pipeline and a secondary cold storage working medium intermediate tank; the pretreatment subsystem comprises a secondary cold storage working medium desulfurization and dehydration device, a filter and a coiled tube heat exchanger; an air outlet of a secondary cold storage working medium intermediate tank is sequentially communicated with an unloading compressor and an unloading gas phase pipeline; a working medium inlet of the secondary cold storage working medium intermediate tank is communicated with an unloading liquid phase pipeline; the second-stage cold storage working medium intermediate tank is also communicated with a second-stage cold storage working medium desulfurization and dehydration device; the secondary cold storage working medium desulfurization and dehydration device is sequentially communicated with the filter and the coiled tube heat exchanger; when the second-stage cold storage working medium tank car arrives at a designated area, an air inlet of the second-stage cold storage working medium tank car is communicated with an unloading gas phase pipeline; and a working medium outlet of the second-stage cold storage working medium tank car is communicated with an unloading liquid phase pipeline.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid air energy storage, in particular to a large-scale deep cryogenic cold storage working fluid unloading and pretreatment system and method. BACKGROUND

[0002] Liquid air energy storage technology refers to a large-scale long-time energy storage technology that realizes the storage and release of electric energy through air liquefaction storage and liquid air temperature recovery gasification. It is one of the most potential and competitive large-scale long-time energy storage technologies. Liquid air energy storage technology includes an energy storage stage and an energy release stage. In the energy storage stage, air is compressed and cooled, then enters a cold box for deep cooling and liquefaction, and the obtained liquid air is stored in a liquid air storage tank. In the energy release stage, the liquid air is subjected to temperature recovery gasification in the cold box, then enters a heat exchanger for heating, and then enters an expander set to drive a generator to generate electricity. Current liquid air energy storage technology mainly includes liquid phase cold storage based liquid air energy storage technology and solid phase cold storage based liquid air energy storage technology. The liquid phase cold storage based liquid air energy storage technology has higher maturity, and has entered the stage of large-scale engineering construction. A 60MW / 600MWh liquid air energy storage engineering demonstration project with the highest power and largest scale in the world is being constructed.

[0003] The cold storage working fluids used in the 60MW / 600MWh liquid air energy storage demonstration project are methanol and propane. The propane vapor pressure of propane is 0.73MPa at 15℃, which belongs to liquefied hydrocarbon. The fire hazard belongs to Class A, and it is a flammable and explosive gas. The upper explosive limit is 9.5%(V / V), the lower explosive limit is 2.1%(V / V), and it can form an explosive mixture with air. It is dangerous to burn and explode when encountering heat sources and open flames. Propane is gaseous at room temperature, and is generally compressed into liquid state for transportation, mainly by railway transportation and tank truck transportation. The amount of propane required by the project is about 6000 tons, which involves a large amount of propane unloading and pretreatment. At present, the commonly used unloading methods for liquid propane include compressor pressurization unloading method, pump unloading method, and heating unloading method, which do not include the pretreatment link. In the liquid air energy storage system, to avoid damage to deep cryogenic equipment caused by impurities solidification, a large amount of propane needs to be unloaded and strictly pretreated before being used as deep cryogenic cold storage working fluid.

[0004] In summary, the main defects of the prior art include that the traditional propane unloading scheme does not include the propane pretreatment link, there is a lack of deep cryogenic cold storage working fluid unloading and pretreatment integrated system and scheme for liquid air energy storage systems, and the use of traditional unloading schemes for cold storage working fluid unloading and pretreatment separately has problems such as long time consumption and high safety risk. SUMMARY

[0005] In order to solve the problems of lack of liquid air energy storage system deep low temperature cold storage medium unloading and pretreatment integrated system and scheme, long time consumption and large safety risk of traditional cold storage medium unloading and pretreatment, the application provides a large-scale deep low temperature cold storage medium unloading and pretreatment system and method.

[0006] In order to achieve the above-mentioned purpose, the application provides a cold storage medium unloading and pretreatment system, which comprises an unloading subsystem and a pretreatment subsystem, the unloading subsystem comprises an unloading compressor, an unloading gas phase pipeline, an unloading liquid phase pipeline and a secondary cold storage medium intermediate tank, the pretreatment subsystem comprises a secondary cold storage medium desulfurization and dehydration device, a filter and a coil heat exchanger, the air outlet of the secondary cold storage medium intermediate tank is sequentially communicated with the unloading compressor and the unloading gas phase pipeline, the medium inlet of the secondary cold storage medium intermediate tank is communicated with the unloading liquid phase pipeline, the secondary cold storage medium intermediate tank is further communicated with the secondary cold storage medium desulfurization and dehydration device, the secondary cold storage medium desulfurization and dehydration device is sequentially communicated with the filter and the coil heat exchanger, when the secondary cold storage medium tank truck reaches a specified area, the air inlet of the secondary cold storage medium tank truck is communicated with the unloading gas phase pipeline, and the medium outlet of the secondary cold storage medium tank truck is communicated with the unloading liquid phase pipeline.

[0007] Preferably, a first control valve and a second control valve are further arranged in series between the unloading liquid phase pipeline and the medium inlet of the secondary cold storage medium intermediate tank, a third control valve and a secondary cold storage medium pump are arranged in series on the connecting pipeline between the secondary cold storage medium intermediate tank and the secondary cold storage medium desulfurization and dehydration device, and the inlet of the third control valve is connected between the first control valve and the second control valve.

[0008] Preferably, the cold storage medium unloading and pretreatment system further comprises a first analysis testing device, and the first analysis testing device is connected between the first control valve and the second control valve through a first stop valve.

[0009] Preferably, the cold storage medium unloading and pretreatment system further comprises a second analysis testing device, and the second analysis testing device is connected between the secondary cold storage medium desulfurization and dehydration device and the filter through a second stop valve.

[0010] Preferably, the cold storage medium unloading and pretreatment system further comprises a secondary cold storage medium low-temperature tank, and the secondary cold storage medium low-temperature tank is communicated with the coil heat exchanger.

[0011] Preferably, the cold storage medium unloading and pretreatment system further comprises a first-stage cold storage medium normal-temperature tank, a first-stage cold storage medium circulating pump and a first-stage cold storage medium medium-temperature tank, the first-stage cold storage medium normal-temperature tank is connected to the upper portion of the pipe coil heat exchanger through the first-stage cold storage medium circulating pump, the first-stage cold storage medium medium-temperature tank is in communication with the pipe coil heat exchanger, the normal-temperature first-stage cold storage medium in the first-stage cold storage medium normal-temperature tank is transported to the upper portion of the pipe coil heat exchanger by the first-stage cold storage medium circulating pump to be cooled, and the cooled first-stage cold storage medium enters the first-stage cold storage medium medium-temperature tank for standby use.

[0012] Preferably, the cold storage medium unloading and pretreatment system further comprises a second-stage cold storage medium medium-temperature tank and a second-stage cold storage medium circulating pump, the second-stage cold storage medium medium-temperature tank and the second-stage cold storage medium circulating pump are in series communication and then in communication with the pipe coil heat exchanger through the cold storage circulating pipe to form a closed cold storage circulating loop.

[0013] Preferably, the cold storage medium unloading and pretreatment system further comprises a flare pipeline, the second-stage cold storage medium intermediate tank, the first analysis and testing device, the second-stage cold storage medium desulfurization and dehydration device, the second analysis and testing device, the second-stage cold storage medium low-temperature tank, the first-stage cold storage medium normal-temperature tank, the first-stage cold storage medium medium-temperature tank and the second-stage cold storage medium medium-temperature tank are in communication with the flare pipeline.

[0014] Preferably, the second-stage cold storage medium is propane, propylene or other cold storage medium in gaseous state at normal temperature.

[0015] Preferably, the unloading subsystem and the pretreatment subsystem are continuously and alternately operated.

[0016] The application further provides a method for operating the cold storage medium unloading and pretreatment system, comprising the following steps: S1, in the unloading subsystem, after the second-stage cold storage medium tank truck arrives at a designated area, the unloading compressor compresses the air in the second-stage cold storage medium intermediate tank and then transports the compressed air to the second-stage cold storage medium tank truck through the unloading gas-phase pipeline to pressurize the cold storage medium in the storage tank of the second-stage cold storage medium tank truck, the liquid-phase cold storage medium in the second-stage cold storage medium tank truck enters the second-stage cold storage medium intermediate tank through the unloading liquid-phase pipeline, the first control valve and the second control valve, and when the liquid level of the liquid-phase cold storage medium in the second-stage cold storage medium intermediate tank reaches the highest liquid level, the unloading operation is stopped; S2, in the pretreatment subsystem, the cold storage medium in the secondary cold storage medium intermediate tank is transported to the secondary cold storage medium desulfurization and dehydration device through the third control valve by the secondary cold storage medium pump, the pretreated secondary cold storage medium enters the second analysis testing device, if the pretreatment is not up to standard, it returns to the secondary cold storage medium desulfurization and dehydration device for continuous treatment, if the pretreatment reaches the standard requirement, it enters the next stage; the pretreated cold storage medium enters the filter to filter impurities, then enters the spiral pipe heat exchanger, is pre-cooled by liquid nitrogen, and the pre-cooled secondary cold storage medium enters the secondary cold storage medium low-temperature tank for standby; at the same time, the normal-temperature primary cold storage medium in the primary cold storage medium normal-temperature tank is transported to the upper part of the spiral pipe heat exchanger for cooling by the primary cold storage medium circulating pump, and after cooling, enters the primary cold storage medium medium-temperature tank for standby; with the progress of the pretreatment process, the secondary cold storage medium in the secondary cold storage medium intermediate tank gradually decreases, and when the medium in the secondary cold storage medium intermediate tank reaches the lowest liquid level, the pretreatment operation is stopped.

[0017] Preferably, the unloading operation and the pretreatment operation are continuously and alternately performed, that is, the continuous and alternate performance of starting the unloading operation, reaching the highest liquid level of the secondary cold storage medium intermediate tank, stopping the unloading operation, starting the pretreatment operation, reaching the lowest liquid level of the secondary cold storage medium intermediate tank, stopping the pretreatment operation, and starting the unloading operation.

[0018] Preferably, when the temperature of the medium in the secondary cold storage medium medium-temperature tank increases by 5 DEG C, the circulating cooling operation is performed for safety, and the specific operation mode is that the secondary cold storage medium circulating pump is opened, the secondary cold storage medium in the secondary cold storage medium medium-temperature tank is transported to the upper part of the spiral pipe heat exchanger, is cooled by liquid nitrogen, and the cooled secondary cold storage medium returns to the secondary cold storage medium medium-temperature tank.

[0019] Compared with the prior art, the application has the following beneficial effects: The cold storage medium unloading and pretreatment system combines the secondary cold storage medium unloading and pretreatment processes through the secondary cold storage medium intermediate tank. After the tank car reaches the corresponding area, the unloading operation is first performed, the unloading operation is stopped when the highest liquid level of the secondary cold storage medium intermediate tank is reached, the secondary cold storage medium enters the secondary cold storage medium pretreatment link, and the pretreatment operation is stopped when the lowest liquid level of the secondary cold storage medium intermediate tank is reached. The unloading and pretreatment are continuously and alternately performed, the work efficiency of the on-site unloading and pretreatment and the utilization efficiency of the secondary cold storage medium intermediate tank are improved. In addition, the multi-stream spiral pipe heat exchanger used in the pretreatment system not only pre-cools the primary and secondary cold storage media in the starting stage, but also can be used for the circulating cooling of the secondary cold storage medium, so as to ensure the safety of the cold storage medium storage process. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the specific embodiments of this application to explain the technical solutions of the present invention and do not constitute a limitation on the technical solutions of the present invention.

[0021] Figure 1 This is a schematic diagram of the structure of the cold storage working medium unloading and pretreatment system described in this invention.

[0022] Figure label: 1: Unloading compressor; 2: Unloading vapor phase pipeline; 3: Secondary cold storage medium tank truck; 4: Unloading liquid phase pipeline; 5: First control valve; 6: Second control valve; 7: Secondary cold storage medium intermediate tank; 8: First analytical testing device; 9: Third control valve; 10: Secondary cold storage medium pump; 11: Secondary cold storage medium desulfurization and dehydration device; 12: Second analytical testing device; 13: Filter; 14: Winded tube heat exchanger; 15: Secondary cold storage medium low temperature tank; 16: Primary cold storage medium ambient temperature tank; 17: Primary cold storage medium circulation pump; 18: Primary cold storage medium medium temperature tank; 19: Secondary cold storage medium medium temperature tank; 20: Secondary cold storage medium circulation pump; 21: Flare pipeline. Detailed Implementation

[0023] The invention is described in more detail below to aid in understanding it.

[0024] like Figure 1 As shown, the cold storage medium unloading and pretreatment system of the present invention includes an unloading subsystem and a pretreatment subsystem. The unloading subsystem includes an unloading compressor 1, an unloading gas phase pipeline 2, an unloading liquid phase pipeline 4, and a secondary cold storage medium intermediate tank 7. The pretreatment subsystem includes a secondary cold storage medium desulfurization and dehydration device 11, a filter 13, and a coiled tube heat exchanger 14. The air outlet of the secondary cold storage medium intermediate tank 7 is sequentially connected to the unloading compressor 1 and the unloading gas phase pipeline 2. The working fluid inlet is connected to the unloading liquid phase pipeline 4; the secondary cold storage working fluid intermediate tank 7 is also connected to the secondary cold storage working fluid desulfurization and dehydration device 11; the secondary cold storage working fluid desulfurization and dehydration device 11 is sequentially connected to the filter 13 and the coiled tube heat exchanger 14; when the secondary cold storage working fluid tank truck 3 arrives at the designated area, the air inlet of the secondary cold storage working fluid tank truck 3 is connected to the unloading gas phase pipeline 2; the working fluid outlet of the secondary cold storage working fluid tank truck 3 is connected to the unloading liquid phase pipeline 4.

[0025] Preferably, the unloading liquid pipeline 4 is connected in series with the working medium inlet of the secondary cold storage working medium intermediate tank 7, and the first control valve 5 and the second control valve 6 are arranged between the unloading liquid pipeline 4 and the working medium inlet of the secondary cold storage working medium intermediate tank 7; the third control valve 9 and the secondary cold storage working medium pump 10 are arranged in series on the connecting pipeline between the secondary cold storage working medium intermediate tank 7 and the secondary cold storage working medium desulfurization and dehydration device 11, and the inlet of the third control valve 9 is connected between the first control valve 5 and the second control valve 6.

[0026] Preferably, the cold storage working medium unloading and pretreatment system further comprises a first analysis testing device 8, and the first analysis testing device 8 is connected between the first control valve 5 and the second control valve 6 through a first stop valve.

[0027] Preferably, the cold storage working medium unloading and pretreatment system further comprises a second analysis testing device 12, and the second analysis testing device 12 is connected between the secondary cold storage working medium desulfurization and dehydration device 11 and the filter 13 through a second stop valve.

[0028] Preferably, the cold storage working medium unloading and pretreatment system further comprises a secondary cold storage working medium low-temperature tank 15, and the secondary cold storage working medium low-temperature tank 15 is in communication with the pipe coil heat exchanger 14.

[0029] Preferably, the cold storage working medium unloading and pretreatment system further comprises a primary cold storage working medium normal-temperature tank 16, a primary cold storage working medium circulating pump 17 and a primary cold storage working medium medium-temperature tank 18, the primary cold storage working medium normal-temperature tank 16 is connected to the upper part of the pipe coil heat exchanger 14 through the primary cold storage working medium circulating pump 17; the primary cold storage working medium medium-temperature tank 18 is in communication with the pipe coil heat exchanger 14; the normal-temperature primary cold storage working medium in the primary cold storage working medium normal-temperature tank 16 is transported to the upper part of the pipe coil heat exchanger 14 by the primary cold storage working medium circulating pump 17 to be cooled, and after being cooled, enters the primary cold storage working medium medium-temperature tank 18 for standby use.

[0030] Preferably, the cold storage working medium unloading and pretreatment system further comprises a secondary cold storage working medium medium-temperature tank 19 and a secondary cold storage working medium circulating pump 20, and after the secondary cold storage working medium medium-temperature tank 19 and the secondary cold storage working medium circulating pump 20 are connected in series and communicated, a cold preservation circulating pipeline is in communication with the pipe coil heat exchanger 14 to form a closed cold preservation circulating loop.

[0031] Preferably, the cold storage working medium unloading and pretreatment system further comprises a flare pipeline 21, and the secondary cold storage working medium intermediate tank 7, the first analysis testing device 8, the secondary cold storage working medium desulfurization and dehydration device 11, the second analysis testing device 12, the secondary cold storage working medium low-temperature tank 15, the primary cold storage working medium normal-temperature tank 16, the primary cold storage working medium medium-temperature tank 18 and the secondary cold storage working medium medium-temperature tank 19 are respectively in communication with the flare pipeline 21.

[0032] Preferably, the secondary cold storage medium is propane, propylene or other gaseous cold storage medium at room temperature.

[0033] Preferably, the unloading subsystem and the pretreatment subsystem are continuously and alternately operated.

[0034] The operation method of the cold storage medium unloading and pretreatment system comprises the following steps: S1, in the unloading subsystem, after the secondary cold storage medium tank truck 3 reaches the designated area, the unloading compressor 1 compresses the air in the secondary cold storage medium intermediate tank 7 and delivers it to the secondary cold storage medium tank truck 3 through the unloading gas phase pipeline 2, so as to pressurize the cold storage medium in the storage tank of the secondary cold storage medium tank truck, and make the liquid phase cold storage medium in the secondary cold storage medium tank truck enter the secondary cold storage medium intermediate tank 7 through the unloading liquid phase pipeline 4, the first control valve 5 and the second control valve 6; when the liquid level of the liquid phase cold storage medium in the secondary cold storage medium intermediate tank 7 reaches the highest liquid level, the unloading operation is stopped. S2, in the pretreatment subsystem, the cold storage medium in the secondary cold storage medium intermediate tank 7 is delivered to the secondary cold storage medium desulfurization and dehydration device 11 through the third control valve 9 by the secondary cold storage medium pump 10, the pretreated secondary cold storage medium enters the second analysis test device 12, if the pretreatment is not up to standard, it returns to the pretreatment device (i.e. the secondary cold storage medium desulfurization and dehydration device 11) for continuous treatment, if the pretreatment meets the standard requirements, it enters the next stage; after the pretreated cold storage medium enters the filter 13 to filter impurities, it enters the coil heat exchanger 14 and is pre-cooled by liquid nitrogen LN, the pre-cooled secondary cold storage medium enters the secondary cold storage medium low-temperature tank 15 for standby; at the same time, the normal-temperature primary cold storage medium in the primary cold storage medium normal-temperature tank 16 is delivered to the upper part of the coil heat exchanger 14 to be cooled by the primary cold storage medium circulating pump 17, and after being cooled, it enters the primary cold storage medium medium-temperature tank 18 for standby; with the progress of the pretreatment process, the secondary cold storage medium in the secondary cold storage medium intermediate tank 7 gradually decreases, and when the medium in the secondary cold storage medium intermediate tank 7 reaches the lowest liquid level, the pretreatment operation is stopped.

[0035] The large-scale deep cryogenic cold storage medium unloading and pretreatment system continuously and alternately operates the secondary cold storage medium unloading and pretreatment, i.e. continuously and alternately operates the process of starting unloading operation→ reaching the highest liquid level of the intermediate tank→ stopping the unloading operation→ starting the pretreatment operation→ reaching the lowest liquid level of the intermediate tank→ stopping the pretreatment operation→ starting the unloading operation, so as to improve the unloading and pretreatment efficiency and improve the utilization rate of the propane intermediate tank (i.e. the secondary cold storage medium intermediate tank 7).

[0036] In addition, the large-scale deep cryogenic storage medium unloading and pretreatment system can also provide circulating cooling for the secondary storage medium. When the temperature of the secondary storage medium in the medium temperature tank 19 increases by 5 DEG C, the circulating cooling operation is performed to ensure safety. The specific operation mode is as follows: the secondary storage medium circulating pump 20 is opened, the secondary storage medium in the medium temperature tank 19 is transported to the upper part of the spiral pipe heat exchanger 14, and the secondary storage medium is cooled by liquid nitrogen. The cooled secondary storage medium returns to the medium temperature tank 19. Not only the safety of the storage medium is ensured, but also the utilization rate of the spiral pipe heat exchanger is improved.

[0037] The system of the present application is provided with a safety valve and a discharge pipeline connected with a torch pipeline (21) for each tank and device to ensure the safety of the unloading and pretreatment process.

[0038] The analysis and testing device is arranged behind the secondary storage medium intermediate tank and the secondary storage medium desulfurization and dehydration device to detect various indexes of the raw material and the pretreated storage medium, so as to ensure the operation quality and efficiency of the pretreatment.

[0039] The large-scale deep cryogenic storage medium unloading and pretreatment system combines the secondary storage medium unloading and pretreatment process through the secondary storage medium intermediate tank. After the tank car reaches the corresponding area, the unloading operation is first performed, and the unloading operation is stopped when the secondary storage medium reaches the highest liquid level of the secondary storage medium intermediate tank. The secondary storage medium enters the secondary storage medium pretreatment link, and the pretreatment operation is stopped when the secondary storage medium reaches the lowest liquid level of the secondary storage medium intermediate tank. The unloading and pretreatment are continuously alternated, so that the work efficiency of the on-site unloading and pretreatment and the utilization efficiency of the secondary storage medium intermediate tank are improved. In addition, the multi-stream spiral pipe heat exchanger used in the pretreatment system not only pre-cools the primary and secondary storage medium in the starting stage, but also can be used for the circulating cooling of the secondary storage medium, so as to ensure the safety of the storage process of the storage medium.

[0040] The technical key points of the present application include: 1. The large-scale deep cryogenic storage medium unloading and pretreatment system of the present application comprises an unloading subsystem (unloading gas phase pipeline, unloading liquid phase pipeline, unloading compressor, secondary storage medium intermediate tank) and a pretreatment subsystem (coiled tube heat exchanger, desulfurization and dehydration device, filter), and also relates to a storage tank for storing the storage medium. The coupling mode is that the unloading subsystem and the pretreatment subsystem are connected through the secondary storage medium intermediate tank, after the tank car reaches the corresponding area, the unloading operation is first performed, and after the secondary storage medium reaches the highest liquid level of the secondary storage medium intermediate tank, the unloading operation is stopped; the secondary storage medium enters the secondary storage medium pretreatment link, the secondary storage medium is transported from the intermediate tank to the secondary storage medium desulfurization and dehydration device through a delivery pump, the secondary storage medium that has passed the treatment enters the filter to filter impurities, and then enters the secondary storage medium low-temperature tank after being cooled at the upper part of the coiled tube heat exchanger, and when the secondary storage medium reaches the lowest liquid level of the secondary storage medium intermediate tank, the pretreatment operation is stopped. The unloading and pretreatment are alternately performed, so as to improve the site work efficiency and the utilization efficiency of the secondary storage medium intermediate tank.

[0041] 2. The large-scale deep cryogenic storage medium unloading and pretreatment system of the present application can simultaneously cool the primary storage medium at the upper part of the coiled tube heat exchanger while cooling the secondary storage medium at the lower part of the coiled tube heat exchanger, and the cooled primary and secondary storage media are respectively stored in the primary storage medium medium-temperature tank and the secondary storage medium low-temperature tank.

[0042] 3. The large-scale deep cryogenic storage medium unloading and pretreatment system of the present application is designed with a multi-stream coiled tube heat exchanger, which can not only precool the primary and secondary storage media during the start-up stage, but also be used for circulating cooling of the secondary storage medium, when the temperature of the secondary storage medium increases by 5℃, the secondary storage medium is transported to the upper part of the coiled tube heat exchanger for cooling and then returned to the secondary storage medium medium-temperature tank for circulating cooling operation, so as to ensure the safety of the secondary storage medium during storage.

[0043] 4. The large-scale deep cryogenic storage medium unloading and pretreatment system of the present application is provided with safety valves in the storage medium storage tank, the intermediate tank and the pretreatment device, and is connected with a flare pipeline, so as to ensure the safety during operation.

[0044] 5. The secondary storage medium intermediate tank and the secondary storage medium desulfurization and dehydration device of the present application are provided with an analysis and testing device after the secondary storage medium desulfurization and dehydration device, which is used for detecting various indexes of the raw material and the pretreated storage medium, returning the secondary storage medium that has not passed the treatment to the treatment device for continuous treatment, and ensuring the quality and efficiency of the pretreatment operation.

[0045] The above describes the preferred embodiments of the present application, but the present application is not limited to the above. Those skilled in the art can make improvements and changes to the embodiments disclosed herein without departing from the scope and spirit of the present application.

Claims

1. A cold storage charge unloading and pretreatment system, characterized by, The aforementioned cold storage medium unloading and pretreatment system includes an unloading subsystem and a pretreatment subsystem. The unloading subsystem includes an unloading compressor, an unloading gas phase pipeline, an unloading liquid phase pipeline, and a secondary cold storage medium intermediate tank. The pretreatment subsystem includes a secondary cold storage medium desulfurization and dehydration device, a filter, and a coiled tube heat exchanger. The air outlet of the secondary cold storage medium intermediate tank is sequentially connected to the unloading compressor and the unloading gas phase pipeline; the working fluid inlet of the secondary cold storage medium intermediate tank is connected to the unloading liquid phase pipeline; the secondary cold storage medium intermediate tank is also connected to the secondary cold storage medium desulfurization and dehydration device; the secondary cold storage medium desulfurization and dehydration device is sequentially connected to the filter and the coiled tube heat exchanger; when the secondary cold storage medium tank truck arrives at the designated area, the air inlet of the secondary cold storage medium tank truck is connected to the unloading gas phase pipeline; the working fluid outlet of the secondary cold storage medium tank truck is connected to the unloading liquid phase pipeline.

2. The cold reservoir charge unloading and pretreatment system of claim 1, wherein, A first control valve and a second control valve are connected in series between the unloading liquid phase pipeline and the working fluid inlet of the secondary cold storage intermediate tank. A third control valve and a secondary cold storage pump are connected in series on the connecting pipeline between the secondary cold storage intermediate tank and the secondary cold storage desulfurization and dehydration device. The inlet of the third control valve is connected between the first control valve and the second control valve.

3. The cold reservoir working fluid unloading and pretreatment system of claim 2, wherein, The cold storage medium unloading and pretreatment system also includes a first analysis and testing device, which is connected between the first control valve and the second control valve via a first shut-off valve.

4. The cold accumulator charge unloading and pretreatment system of claim 1, wherein, The cold storage medium unloading and pretreatment system also includes a second analysis and testing device, which is connected between the secondary cold storage medium desulfurization and dehydration device and the filter via a second shut-off valve.

5. The cold accumulator charge unloading and pretreatment system of claim 1, wherein, The aforementioned cold storage medium unloading and pretreatment system also includes a secondary cold storage medium cryogenic tank, which is connected to the aforementioned coiled tube heat exchanger.

6. The cold accumulator charge unloading and pretreatment system of claim 1, wherein, The aforementioned cold storage medium unloading and pretreatment system also includes a primary cold storage medium ambient temperature tank, a primary cold storage medium circulation pump, and a primary cold storage medium intermediate temperature tank. The primary cold storage medium ambient temperature tank is connected to the upper part of the coiled tube heat exchanger via the primary cold storage medium circulation pump; the primary cold storage medium intermediate temperature tank is connected to the coiled tube heat exchanger; the ambient temperature primary cold storage medium in the primary cold storage medium ambient temperature tank is transported by the primary cold storage medium circulation pump to the upper part of the coiled tube heat exchanger for cooling, and after cooling, it enters the primary cold storage medium temperature tank for later use.

7. The cold accumulator charge unloading and pretreatment system of claim 1, wherein, The cold storage medium unloading and pretreatment system also includes a secondary cold storage medium temperature tank and a secondary cold storage medium circulation pump. The secondary cold storage medium temperature tank and the secondary cold storage medium circulation pump are connected in series and then connected to the coiled tube heat exchanger through a cold storage circulation pipe to form a closed cold storage circulation loop.

8. The cold accumulator charge unloading and pretreatment system of claim 1, wherein, The cold storage working medium unloading and pretreatment system further comprises a flare pipeline, and the secondary cold storage working medium intermediate tank, the first analysis testing device, the secondary cold storage working medium desulfurization and dehydration device, the second analysis testing device, the secondary cold storage working medium low-temperature tank, the primary cold storage working medium normal-temperature tank, the primary cold storage working medium medium-temperature tank and the secondary cold storage working medium medium-temperature tank are in communication with the flare pipeline.

9. The cold accumulator charge unloading and pretreatment system of claim 1, wherein, The secondary cold storage working medium is a working medium in a gaseous state at normal temperature.

10. The cold accumulator charge unloading and pretreatment system of claim 1, wherein, The unloading subsystem and the pretreatment subsystem are continuously and alternately operated.

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