Full-automatic liquid chlorine unloading system

Abstract

The invention relates to the technical field of liquid chlorine unloading, in particular to a liquid chlorine full-automatic unloading system which comprises a liquid chlorine tank car, a crane pipe and a control system. A liquid chlorine pressure gauge for detecting the internal pressure is arranged on the liquid chlorine tank car, and a gas phase opening communicated with the gas phase end of the loading arm and a liquid phase opening communicated with the liquid phase end of the loading arm are formed in the liquid chlorine tank car; a middle storage tank for storing liquid chlorine is arranged below the liquid chlorine tank car, and a middle pressure gauge electrically connected with the control system is arranged on the middle storage tank in a communicating manner; a liquid chlorine feeding stop valve is arranged between the liquid phase end of the loading arm and the middle storage tank in a communicating manner, and a feeding flow meter is arranged between the liquid chlorine feeding stop valve and the middle storage tank in a communicating manner; the intermediate storage tank is communicated with a gas phase equilibrium line stop valve, the gas phase end and the liquid phase end of the crane pipe are jointly communicated with a gas phase stop valve, and a gas phase pipeline is communicated between the gas phase equilibrium line stop valve and the gas phase stop valve. The liquid chlorine discharging device has the effect of efficiently discharging liquid chlorine.

Description

Technical Field

[0001] This application relates to the field of liquid chlorine unloading technology, and in particular to a fully automated liquid chlorine unloading system. Background Technology

[0002] Liquid chlorine unloading technology, as a key link in the liquid chlorine supply chain, is widely used in various industries such as chlor-alkali chemicals, water treatment, paper and textiles, pesticides and pharmaceuticals, plastics and synthetic materials, and metal smelting. In the chlor-alkali chemical industry, it is used for finished liquid chlorine products leaving the factory and receiving raw materials; in the water treatment industry, it is used for disinfection of tap water and sewage; in the paper and textile industry, it is used in bleaching processes; in the pesticide and pharmaceutical industry, it is used as a synthetic raw material; in the plastics industry, it is used in PVC production; and in the metal smelting industry, it is used for the preparation of metal chlorides.

[0003] The development of liquid chlorine unloading technology has a rich historical background and technological evolution. Early liquid chlorine transportation mainly relied on steel cylinders, which suffered from cumbersome operations, low efficiency, and significant safety hazards. With the expansion of industrial production and increasing safety requirements, liquid chlorine tank trucks gradually replaced steel cylinders as the primary mode of transportation, driving innovation in unloading technology. As a highly toxic chemical, liquid chlorine leaks can cause serious casualties and environmental pollution accidents, prompting the industry to continuously improve the safety and reliability of unloading technologies.

[0004] Currently, there are two main unloading processes for liquid chlorine tank trucks in China: 1. Vaporization unloading process: This process involves heating and vaporizing liquid chlorine into chlorine gas through a vaporizer, which is then pressed from the tank truck into a storage tank. The entire unloading process consumes a lot of energy and is not economical. Nitrogen trichloride is prone to accumulate in the vaporizer, posing a risk of explosion and overpressure leakage, resulting in safety hazards and large exhaust emissions. 2. Pneumatic unloading process: This process is simple and safe, but it has extremely high requirements for the quality of compressed air (or nitrogen). The water content in the compressed air (or nitrogen) must be strictly controlled. Otherwise, chlorine will easily react with the moisture in the air (or nitrogen) to produce hypochlorous acid and hydrochloric acid, which can cause strong corrosion to equipment and pipelines, affect the purity of the final liquid chlorine, and easily generate a large amount of waste gas, causing environmental pollution.

[0005] Therefore, there is an urgent need to design a fully automated liquid chlorine unloading system to avoid leakage of high-purity liquid chlorine during the unloading process and to ensure the purity of the high-purity liquid chlorine after unloading. Summary of the Invention

[0006] To address the issues of complex supporting systems and low unloading efficiency in traditional liquid chlorine unloading processes, this application provides a fully automated liquid chlorine unloading system.

[0007] The fully automated liquid chlorine unloading system provided in this application adopts the following technical solution: An automated liquid chlorine unloading system includes a liquid chlorine tanker for storing liquid chlorine, an loading arm for connecting the liquid chlorine tanker, and a control system for controlling the loading arm. The liquid chlorine tanker is equipped with a liquid chlorine pressure gauge for detecting internal pressure. The tanker has a gas phase port connected to the gas phase end of the loading arm and a liquid phase port connected to the liquid phase end of the loading arm. An intermediate storage tank for storing liquid chlorine is located below the tanker, and an intermediate pressure gauge electrically connected to the control system is installed on the intermediate storage tank. A liquid chlorine feed shut-off valve is connected between the liquid phase end of the loading arm and the intermediate storage tank, and a feed flow meter is connected between the liquid chlorine feed shut-off valve and the intermediate storage tank. A gas phase balance line shut-off valve is connected to the intermediate storage tank, and a gas phase shut-off valve is connected to both the gas phase end and the liquid phase end of the loading arm, with a gas phase pipeline connecting the gas phase balance line shut-off valve and the gas phase shut-off valve.

[0008] By adopting the above technical solution, when the value displayed by the intermediate pressure gauge exceeds the pressure value inside the liquid chlorine tanker by 0.1 MPa, the liquid chlorine tanker and the intermediate storage tank can quickly transfer liquid chlorine by utilizing the height difference and pressure difference.

[0009] Preferably, the liquid chlorine tanker is provided with at least two sets of liquid chlorine storage tanks on one side, and a tank pressure gauge and a gas phase balance shut-off valve are provided on each set of liquid chlorine storage tanks; and both of the gas phase balance shut-off valves are connected to the gas phase pipeline.

[0010] By adopting the above technical solution, when the value displayed by the intermediate pressure gauge does not exceed the pressure value inside the liquid chlorine tanker by 0.1 MPa, the liquid chlorine storage tank is used to equalize the pressure inside the liquid chlorine tanker so that the liquid chlorine tanker can be unloaded after equalization.

[0011] Preferably, each of the liquid chlorine storage tanks is a vacuum jacket, and each of the liquid chlorine storage tanks is equipped with a vacuum pressure gauge for detecting the vacuum level inside the vacuum jacket.

[0012] By adopting the above technical solution, the vacuum pressure gauge on the liquid chlorine storage tank is used to detect the vacuum level inside the jacket. When the vacuum level is lower than the specified value, it is necessary to perform vacuuming again.

[0013] Preferably, the intermediate storage tank is equipped with a venting regulating valve, and the end of the venting regulating valve away from the intermediate storage tank is connected to a tail gas treatment device.

[0014] By adopting the above technical solution, when the pressure difference between all liquid chlorine storage tanks and the underground intermediate storage tank is also less than 0.1 MPa, the venting regulating valve and the tail gas treatment device work together to treat the chlorine gas inside the intermediate storage tank in order to regulate the pressure inside the intermediate storage tank.

[0015] Preferably, the intermediate storage tank is connected to a feed regulating valve, which is interconnected with each group of liquid chlorine storage tanks, and each liquid chlorine storage tank is connected to the feed regulating valve with a discharge shut-off valve; all liquid chlorine storage tanks are connected to a common level control valve, which is connected to a vaporizer; the intermediate storage tank is equipped with an intermediate level gauge, each liquid chlorine storage tank is equipped with a tank level gauge, and each liquid chlorine storage tank is connected to the level control valve with a tank feed shut-off valve; the intermediate storage tank is connected to a liquid chlorine transfer pump connected to the vaporizer, and an outlet pressure gauge is installed between the liquid chlorine transfer pump and the vaporizer.

[0016] By adopting the above technical solution, after liquid chlorine enters the underground intermediate storage tank, the system will automatically and gradually close the feed regulating valve, and finally close it. The liquid level control valve will be opened, and the liquid level control valve and the underground intermediate liquid level gauge will be set to automatic control to keep the liquid level display value at 50%. The system will detect the storage tank with a low liquid level gauge display value and open the corresponding feed shut-off valve. Because of the unloading of liquid chlorine, the load on the liquid chlorine transfer pump will increase. This transfer pump uses frequency conversion control. When the liquid level control valve is opened, the value of the liquid chlorine transfer pump outlet pressure gauge will decrease. At this time, the system will automatically increase the frequency conversion load to always maintain the value of the liquid chlorine transfer pump outlet pressure gauge, ensuring that the supply of liquid chlorine into the vaporizer through the pipeline is not affected. When the feed flow meter reading is 0, it indicates that the liquid chlorine has been unloaded. The system automatically closes the liquid level control valve and opens the feed regulating valve. At this time, the feed regulating valve and the underground intermediate liquid level gauge will be set to automatic control to maintain the liquid level display value at 50%. The system automatically shuts off the temperature regulating valve, circulating water shut-off valve, gas phase shut-off valve, liquid chlorine feed shut-off valve, and gas phase balance line shut-off valve. The intelligent loading arm shuts off the valves on the gas phase port and liquid phase port, and automatically disconnects from the liquid chlorine tanker. The discharge shut-off valve at the bottom of the liquid chlorine storage tank is used to switch the liquid chlorine supply. When the liquid level in the liquid chlorine storage tank reaches the low liquid level set value, the control system automatically switches.

[0017] Preferably, a vacuum device for evacuation is connected to the end of the gas phase shut-off valve away from the loading arm, and a vacuum shut-off valve is provided between the vacuum device and the gas phase shut-off valve.

[0018] By adopting the above technical solution, the vacuum shut-off valve on the vacuum device pipeline is opened to extract the chlorine gas from the air intake and liquid outlet pipelines of the loading arm. The liquid outlet pipeline needs to be designed and laid out to avoid liquid accumulation points. In this way, the liquid chlorine in the pipeline will flow into the liquid chlorine tanker and the underground intermediate storage tank. Since only the air intake and liquid outlet pipelines of the loading arm need to be extracted, the amount of vacuum pumped into the exhaust gas system is very small.

[0019] Preferably, a gas pressure gauge is provided at the gas phase end of the loading arm, and a liquid pressure gauge is provided at the liquid phase end of the loading arm.

[0020] By adopting the above technical solution, after the vacuum is completed, the vacuum shut-off valve is closed. Then, by observing the changes in the values ​​of the gas phase pressure gauge on the inlet pipeline and the liquid phase pressure gauge on the outlet pipeline, it can be determined whether there is any chlorine leakage from the liquid chlorine system to the loading arm.

[0021] Preferably, a cryogenic condenser is provided between the liquid chlorine tanker and the intermediate storage tank, and the cryogenic condenser is located between the liquid chlorine feed shut-off valve and the feed flow meter.

[0022] By adopting the above technical solution, during the process of liquid chlorine entering the underground intermediate storage tank from the liquid chlorine tanker, it passes through a low-temperature condenser. The function of this condenser is to control the temperature of the unloaded liquid chlorine to be slightly lower than the temperature of the liquid chlorine in the liquid chlorine storage tank, thereby reducing the amount of vaporization of the high-temperature liquid chlorine after entering the unloading system. This is especially important in southern regions during the summer when the temperature of the liquid chlorine in the liquid chlorine tanker is high and the amount of exhaust gas emitted during the unloading process is large.

[0023] Preferably, the low-temperature condenser uses 10°C water for temperature control and cooling. One end of the low-temperature condenser is connected to a water inlet pipe, and a temperature regulating valve electrically connected to the control system is connected to the water inlet pipe. The other end of the low-temperature condenser is connected to a water return pipe, and a circulating water shut-off valve is connected to the water return pipe.

[0024] By adopting the above technical solution, the low-temperature condenser uses 10-degree water for temperature control and cooling. The 10-degree water supply enters from the inlet pipe, passes through the temperature regulating valve, and enters the condenser. The return water passes through the circulating water shut-off valve and returns through the return water pipe.

[0025] Preferably, each of the liquid chlorine storage tanks is equipped with a remote temperature gauge electrically connected to the control system, and the lowest temperature value of all the remote temperature gauges is selected as the target setting value of the temperature regulating valve. An outlet temperature gauge is installed between the cryogenic condenser and the feed flow meter.

[0026] By adopting the above technical solution, the temperature regulating valve control method is to automatically read the reading of the remote temperature gauge on the liquid chlorine storage tank, select the lower temperature as the target set value, and use the low-temperature condenser outlet temperature gauge as the actual output value. By controlling the circulating water volume, the temperature of the liquid chlorine entering the system is reduced.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. This invention adopts a fully automatic control system, which reduces the complexity of operation and technical requirements; it employs a low-temperature condenser, vacuuming of the unloading pipeline, system pressure detection technology, and vacuum jacket insulation technology for liquid chlorine storage tanks, which effectively reduces the amount of chlorine emitted into the tail gas treatment device and the risk of chlorine leakage, thus alleviating environmental pressure. 2. The pressure balancing process is adopted, and the internal volume of the 5m³ underground intermediate storage tank is small. Even if there is exhaust gas that needs to be emitted, the amount of exhaust gas is very small. The required equipment is simple, there are few interfering factors, and the purity of the liquid chlorine after unloading is high, which greatly reduces maintenance costs. The pressure equalization gravity flow unloading method of the underground intermediate storage tank is adopted, and the unloading and conveying pumps share the liquid chlorine vaporization pump, which effectively reduces equipment costs and energy consumption costs. 3. The unloading arm uses a remote pressure gauge system to detect leaks in the pipeline even with frequent use, allowing for timely handling and preventing environmental pollution and personal injury. 4. A low-temperature condenser is used to appropriately reduce the temperature of liquid chlorine in the system, effectively reducing the emission of chlorine into the exhaust gas; the pressure of the liquid chlorine storage tank can be controlled at around 0.65 MPa and the temperature at around 20 degrees Celsius. Under saturated vapor pressure, the liquid chlorine has a good insulation effect due to the vacuum jacket, and the heat transfer is limited. Therefore, there is no need to release chlorine into the exhaust gas system due to high pressure. Pressure equalization is sufficient during unloading or use. The low operating pressure makes the entire system safer. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a fully automated liquid chlorine unloading system according to an embodiment of this application.

[0029] Explanation of reference numerals in the attached figures: 1. Liquid chlorine tanker; 2. Vapor inlet; 3. Liquid inlet; 4. Loading arm; 5. Vapor pressure gauge; 6. Liquid pressure gauge; 7. Vapor shut-off valve; 8. Liquid chlorine feed shut-off valve; 9. Vacuum shut-off valve; 10. Vacuum device; 11. Cryogenic condenser; 12. Return water pipe; 13. Inlet water pipe; 14. Intermediate level gauge; 15. Intermediate storage tank; 16. Intermediate pressure gauge; 17. Vapor balance line shut-off valve; 18. Liquid chlorine transfer pump; 19. Outlet pressure gauge; 2 0. Venting regulating valve; 21. Tail gas treatment device; 22. Vaporizer; 23. Liquid level control valve; 24. Gas phase balance shut-off valve; 25. Vacuum pressure gauge; 26. Storage tank feed shut-off valve; 27. Storage tank pressure gauge; 28. Remote temperature gauge; 29. ​​Storage tank level gauge; 30. Liquid chlorine storage tank; 31. Discharge shut-off valve; 32. Temperature regulating valve; 33. Circulating water shut-off valve; 34. Feed flow meter; 35. Outlet thermometer; 36. Feed regulating valve. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0031] This application discloses a fully automated liquid chlorine unloading system for efficient unloading of liquid chlorine.

[0032] Reference Figure 1An automated liquid chlorine unloading system includes a liquid chlorine tanker 1 for storing liquid chlorine, an arm-loading arm 4 for connecting the liquid chlorine tanker 1, and a control system for controlling the arm-loading arm 4; in this embodiment, the control system is a DCS. A liquid chlorine pressure gauge is installed on the liquid chlorine tanker 1 to detect the internal pressure and transmits the tanker pressure data to the control system. The liquid chlorine tanker 1 has a gas phase port 2 and a liquid phase port 3, with the gas phase port 2 of the liquid chlorine tanker 1 connected to the gas phase end of the arm-loading arm 4 via a valve, and the liquid phase port 3 of the liquid chlorine tanker 1 connected to the liquid phase end of the arm-loading arm 4 via a valve.

[0033] Reference Figure 1 An intermediate storage tank 15 for storing liquid chlorine is installed underground beneath the liquid chlorine tanker 1. An intermediate pressure gauge 16, electrically connected to the control system, is installed on the intermediate storage tank 15. Specifically, the intermediate pressure gauge 16 is a remote pressure gauge used to detect the intermediate pressure data inside the intermediate storage tank 15. A liquid chlorine feed shut-off valve 8 is installed between the liquid phase end of the loading arm 4 and the intermediate storage tank 15 via a pipeline. A feed flow meter 34 is also installed between the liquid chlorine feed shut-off valve 8 and the intermediate storage tank 15 via a pipeline to detect the flow rate of liquid chlorine flowing into the intermediate storage tank 15.

[0034] Reference Figure 1 The intermediate storage tank 15 is connected to a gas phase balance line shut-off valve 17. The gas phase end and liquid phase end of the loading arm 4 are connected by a pipeline and a gas phase shut-off valve 7 is installed. A gas phase pipeline is connected between the gas phase balance line shut-off valve 17 and the gas phase shut-off valve 7 to facilitate the gas pressure balance between the intermediate storage tank 15 and the liquid chlorine tank truck 1.

[0035] Reference Figure 1 At least two sets of liquid chlorine storage tanks 30 are installed on one side of the liquid chlorine tank truck 1, and a tank pressure gauge 27 and a gas phase balance shut-off valve 24 are installed on each set of liquid chlorine storage tanks 30; and both sets of gas phase balance shut-off valves 24 are connected to the gas phase pipeline through pipelines. In this embodiment, the liquid chlorine storage tanks 30 are used to equalize the pressure of the liquid chlorine tank truck 1, and the tank pressure gauges 27 are remote pressure gauges. Each set of liquid chlorine storage tanks 30 is a vacuum jacket with extremely low thermal conductivity, and each set of liquid chlorine storage tanks 30 is equipped with a vacuum pressure gauge 25 for detecting the vacuum degree inside the vacuum jacket.

[0036] Reference Figure 1 An venting regulating valve 20 is installed on the intermediate storage tank 15 via a pipeline, and the end of the venting regulating valve 20 away from the intermediate storage tank 15 is connected to a tail gas treatment device 21 via a pipeline to facilitate the adjustment of the internal pressure of the intermediate storage tank 15.

[0037] Reference Figure 1An intermediate storage tank 15 is equipped with a feed regulating valve 36 connected to it via a pipeline. The feed regulating valve 36 is interconnected with each group of liquid chlorine storage tanks 30 via pipelines, and each group of liquid chlorine storage tanks 30 is connected to the feed regulating valve 36 via a pipeline with a discharge shut-off valve 31. All liquid chlorine storage tanks 30 are connected to a common level control valve 23 via pipelines, and the level control valve 23 is connected to a vaporizer 22 via a pipeline to regulate the liquid level inside the liquid chlorine storage tanks 30. Each group of liquid chlorine storage tanks 30 is connected to the level control valve 23 via a tank feed shut-off valve 26 via a pipeline.

[0038] Reference Figure 1 An intermediate level gauge 14 is installed on the intermediate storage tank 15, and a tank level gauge 29 is installed on each group of liquid chlorine storage tanks 30. A liquid chlorine transfer pump 18, which is connected to the vaporizer 22, is installed on the intermediate storage tank 15 through a pipeline to transfer the liquid chlorine inside the intermediate storage tank 15 to the vaporizer 22, and an outlet pressure gauge 19 is installed between the liquid chlorine transfer pump 18 and the vaporizer 22.

[0039] Reference Figure 1 The end of the gas phase shut-off valve 7 furthest from the loading arm 4 is connected to a vacuum device 10 for evacuation via a pipeline, and a vacuum shut-off valve 9 is installed between the vacuum device and the gas phase shut-off valve 7. A gas phase pressure gauge 5 is installed at the gas phase end of the loading arm 4, and a liquid phase pressure gauge 6 is installed at the liquid phase end of the loading arm 4 to facilitate the detection of the airtightness of the loading arm 4.

[0040] Reference Figure 1 A cryogenic condenser 11 is installed between the liquid chlorine tanker 1 and the intermediate storage tank 15, and the cryogenic condenser 11 is located between the liquid chlorine feed shut-off valve 8 and the feed flow meter 34. In this embodiment, the cryogenic condenser 11 uses 10°C water for temperature control. One end of the cryogenic condenser 11 is connected to a water inlet pipe 13, and a temperature regulating valve 32 electrically connected to the control system is installed on the water inlet pipe 13 to regulate the temperature inside the water inlet pipe 13. The other end of the cryogenic condenser 11 is connected to a return water pipe 12, and a circulating water shut-off valve 33 is installed on the return water pipe 12.

[0041] Reference Figure 1 Each group of liquid chlorine storage tanks 30 is equipped with a remote temperature gauge 28 that is electrically connected to the control system, and the lowest temperature value of all remote temperature gauges 28 is selected as the target setting value of the temperature regulating valve 32. An outlet temperature gauge 35 is installed between the low-temperature condenser 11 and the feed flow meter 34.

[0042] The implementation principle of a fully automated liquid chlorine unloading system according to an embodiment of this application is as follows: After the liquid chlorine tanker truck 1 enters the unloading area, the operator checks the vehicle for any abnormalities and monitors the pressure inside the tanker truck using the liquid chlorine pressure gauge. The operator then informs the DCS control system in the central control room. Once it is confirmed that there are no problems and the conditions for unloading are met, the operator inputs the pressure data from the liquid chlorine tanker truck 1 into the system and clicks "unloading operation." The control system then automatically connects the loading arm 4 to the valves at the gas phase port 2 and liquid phase port 3 on the liquid chlorine tanker truck 1. After receiving the connection confirmation, the control system automatically compares the reading on the intermediate pressure gauge 16 of the underground intermediate storage tank 15 with the pressure value inside the liquid chlorine tanker truck 1.

[0043] When the value displayed by the intermediate pressure gauge 16 exceeds the pressure value inside the liquid chlorine tanker 1 by 0.1 MPa, the control system first opens the liquid chlorine feed shut-off valve 8. After the feed flow meter 34 shows a reading, it opens the gas phase balance line shut-off valve 17 and the gas phase shut-off valve 7, so that the pressure inside the liquid chlorine tanker 1 is equalized with the pressure inside the underground intermediate storage tank 15. Because the liquid chlorine tanker 1 is located at a high position, all the liquid chlorine inside the liquid chlorine tanker 1 will flow into the underground intermediate storage tank 15.

[0044] When the value displayed by the intermediate pressure gauge 16 does not exceed the tank truck pressure by 0.1 MPa, the control system will detect the chlorine storage pressure gauge readings on all liquid chlorine storage tanks 30 and select the higher pressure value in the liquid chlorine storage tank 30 to compare with the value displayed by the intermediate pressure gauge 16 of the underground intermediate storage tank 15. When the pressure exceeds 0.1 MPa, the control system automatically opens the gas phase balance shut-off valve 24 on the corresponding liquid chlorine storage tank 30, and then opens the gas phase shut-off valve 7. The pressure inside the liquid chlorine tank truck 1 is equalized by the pressure inside the corresponding liquid chlorine storage tank 30. After the feed flow meter 34 shows a reading, the corresponding gas phase balance shut-off valve 24 is closed, and then the gas phase balance line shut-off valve 17 is opened.

[0045] When the pressure difference between all liquid chlorine storage tanks 30 and the underground intermediate storage tank 15 is also less than 0.1 MPa, the control system will automatically open the venting regulating valve 20, allowing the chlorine gas in the intermediate storage tank 15 to enter the tail gas treatment device 21 through the pipeline for discharge.

[0046] Then, when the pressure difference between the intermediate storage tank 15 and the liquid chlorine tank truck 1 reaches 0.1 MPa, the venting regulating valve 20 is closed, and the unloading operation can continue.

[0047] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fully automated liquid chlorine unloading system, characterized by: The application relates to a liquid chlorine tank truck (1) for storing liquid chlorine, a lance (4) for connecting the liquid chlorine tank truck (1) and a control system for controlling the lance (4); the liquid chlorine tank truck (1) is provided with a liquid chlorine pressure gauge for detecting internal pressure, the liquid chlorine tank truck (1) is provided with a gas phase port (2) connected with a gas phase end of the lance (4) and a liquid phase port (3) connected with a liquid phase end of the lance (4); an intermediate storage tank (15) for storing liquid chlorine is arranged below the liquid chlorine tank truck (1), the intermediate storage tank (15) is provided with an intermediate pressure gauge (16) electrically connected with the control system; a liquid chlorine feeding cut-off valve (8) is arranged between the liquid phase end of the lance (4) and the intermediate storage tank (15), and a feeding flowmeter (34) is arranged between the liquid chlorine feeding cut-off valve (8) and the intermediate storage tank (15); a gas phase balance line cut-off valve (17) is arranged on the intermediate storage tank (15), a gas phase cut-off valve (7) is arranged on the gas phase end and the liquid phase end of the lance (4), and a gas phase pipeline is arranged between the gas phase balance line cut-off valve (17) and the gas phase cut-off valve (7).

2. The full automatic liquid chlorine unloading system according to claim 1, characterized in that: At least two groups of liquid chlorine storage tanks (30) are arranged on one side of the liquid chlorine tank truck (1), and a storage tank pressure gauge (27) and a gas phase balance cut-off valve (24) are arranged on each group of liquid chlorine storage tanks (30); and the two gas phase balance cut-off valves (24) are connected with the gas phase pipeline.

3. The fully automatic liquid chlorine unloading system according to claim 2, characterized in that: Each liquid chlorine storage tank (30) is a vacuum jacket, and a vacuum pressure gauge (25) for detecting the vacuum degree of the vacuum jacket is arranged on each liquid chlorine storage tank (30).

4. The fully automatic liquid chlorine unloading system of claim 2, wherein: A venting adjusting valve (20) is arranged on the intermediate storage tank (15), and a tail gas treatment device (21) is arranged on the end of the venting adjusting valve (20) away from the intermediate storage tank (15).

5. The fully automatic liquid chlorine unloading system according to claim 4, wherein: A feeding adjusting valve (36) is arranged on the intermediate storage tank (15), the feeding adjusting valve (36) is connected with each group of liquid chlorine storage tanks (30), a discharge cut-off valve (31) is arranged between each liquid chlorine storage tank (30) and the feeding adjusting valve (36), a liquid level control valve (23) is arranged on all the liquid chlorine storage tanks (30), the liquid level control valve (23) is connected with a vaporizer (22), an intermediate liquid level meter (14) is arranged on the intermediate storage tank (15), a storage tank liquid level meter (29) is arranged on each liquid chlorine storage tank (30), and a storage tank feeding cut-off valve (26) is arranged between each liquid chlorine storage tank (30) and the liquid level control valve (23); a liquid chlorine conveying pump (18) connected with the vaporizer (22) is arranged on the intermediate storage tank (15), and an outlet pressure gauge (19) is arranged between the liquid chlorine conveying pump (18) and the vaporizer (22).

6. The fully automatic liquid chlorine unloading system according to claim 5, characterized in that: A vacuum device (10) for vacuumizing is arranged on the end of the gas phase cut-off valve (7) away from the lance (4), and a vacuum cut-off valve (9) is arranged between the vacuum device and the gas phase cut-off valve (7).

7. The fully automatic liquid chlorine unloading system according to claim 6, characterized in that: The gas phase end of the hose (4) is provided with a gas phase pressure gauge (5), and the liquid phase end of the hose (4) is provided with a liquid phase pressure gauge (6).

8. The fully automatic liquid chlorine unloading system of claim 1, wherein: A low-temperature condenser (11) is arranged between the liquid chlorine tank truck (1) and an intermediate storage tank (15), and the low-temperature condenser (11) is located between a liquid chlorine feeding cut-off valve (8) and a feeding flowmeter (34).

9. The fully automatic liquid chlorine unloading system of claim 8, wherein: The low-temperature condenser (11) is controlled to reduce temperature by 10 DEG C water, one end of the low-temperature condenser (11) is communicated with a water inlet pipe (13), and a temperature regulating valve (32) electrically connected with a control system is arranged on the water inlet pipe (13); the other end of the low-temperature condenser (11) is provided with a water return pipe (12), and a circulating water cut-off valve (33) is arranged on the water return pipe (12).

10. The fully automatic liquid chlorine unloading system of claim 9, wherein: Each of the liquid chlorine storage tanks (30) is provided with a remote temperature gauge (28) electrically connected with a control system, and the lowest temperature value of all the remote temperature gauges (28) is selected as a target set value of the temperature regulating valve (32), and an outlet thermometer (35) is arranged between the low-temperature condenser (11) and the feeding flowmeter (34).

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