Liquid chlorine tank car unloading and liquid chlorine packaging site configuration system

Abstract

A liquid chlorine tank car unloading and liquid chlorine packaging site configuration system comprises an unloading unit, a liquid chlorine packaging unit, a chlorine liquefying unit, an accident chlorine collecting unit and the like, and an unloading assembly unit comprises an unloading position provided with an unloading crane pipe and a liquid chlorine storage tank; the liquid chlorine packaging unit comprises a liquid chlorine packaging pump and a plurality of liquid chlorine steel cylinders; the chlorine liquefaction assembly unit comprises a first vapor-liquid separator and a chlorine condenser, and the accident chlorine collection unit comprises an accident chlorine exhaust hood and a chlorine tail gas distribution table which are arranged in each unit position. Compared with the prior art, the liquid chlorine unloading system integrating unloading, packaging, liquid chlorine condensation recovery and accident chlorine recovery treatment is built, rapid and safe liquid chlorine unloading is achieved through cooperation of all the units, the situation that the environment is seriously polluted due to leakage or improper emission is greatly reduced, and the environmental pollution is reduced. And potential safety hazards to an ecological system and human health are avoided.

Description

Technical Field

[0001] This utility model relates to the field of chlorine chemical technology, and in particular to a liquid chlorine tanker unloading and liquid chlorine packaging on-site configuration system. Background Technology

[0002] In the chemical industry, liquid chlorine is often transported to application sites by tanker trucks. Because liquid chlorine is a highly toxic chemical with strong oxidizing properties, carelessness during unloading can easily lead to leaks and serious pollution. Current technologies often present the following problems during liquid chlorine unloading:

[0003] The operation is complex and the process is cumbersome: unloading involves multiple steps, making the operation complex and prone to errors.

[0004] Reliance on manual labor: Low level of automation and manual operation increase the risk of errors and accidents;

[0005] Equipment issues: Liquid chlorine is highly corrosive to equipment, making it prone to damage and resulting in high maintenance costs;

[0006] Poor sealing: Inadequate equipment sealing may lead to leakage, increasing safety risks;

[0007] Pollution risk: Improper leakage or discharge can seriously pollute the environment, endanger ecosystems and human health. Utility Model Content

[0008] To address the aforementioned shortcomings of existing technologies, this utility model provides a liquid chlorine tanker unloading and liquid chlorine packaging on-site configuration system as follows:

[0009] The technical solution of this utility model is implemented as follows:

[0010] A liquid chlorine tanker unloading and liquid chlorine packaging on-site configuration system includes an unloading unit, a liquid chlorine packaging unit, a chlorine liquefaction unit, and an emergency chlorine gas collection unit. The unloading unit includes an unloading position with an unloading arm and a liquid chlorine storage tank. The unloading arm connects the liquid chlorine tanker and the liquid chlorine storage tank via a liquid phase pipe. A compressed air device is connected to the upper part of the liquid chlorine tanker via a compressed air pipeline. The liquid chlorine packaging unit includes a liquid chlorine packaging pump and several liquid chlorine cylinders. The inlet of the liquid chlorine packaging pump is connected to the liquid chlorine storage tank, and the outlet is detachably connected to each liquid chlorine cylinder. The chlorine liquefaction unit includes a first vapor-liquid separator and a chlorine condenser. The first vapor-liquid separator is connected to the vapor phase pipe of the unloading arm via a Nash pump and then to the liquid chlorine tanker. The outlet of the first vapor-liquid separator is connected to the chlorine condenser. The liquid chlorine condenser discharges liquid... The system is connected to a second vapor-liquid separator, the outlet of which is connected to a liquid chlorine storage tank. The system can be externally connected to a sodium hypochlorite absorption unit, which includes a sodium hypochlorite absorption tower, an alkali storage tank, a tap water storage tank, an alkali mixing tank, and a sodium hypochlorite circulation tank. The alkali storage tank and the tap water storage tank are connected to the alkali mixing tank via transfer pumps. The alkali mixing tank is connected to the sodium hypochlorite circulation tank via an alkali mixing transfer pump. The upper end of the sodium hypochlorite circulation tank is connected to the alkali outlet of the sodium hypochlorite absorption tower via a pipeline. The bottom end of the sodium hypochlorite circulation tank is connected to the alkali sprayer inside the sodium hypochlorite absorption tower via a sodium hypochlorite circulation pump. The top of the sodium hypochlorite absorption tower has a tail gas outlet, and the sodium hypochlorite absorption tower has an emergency chlorine gas inlet, which is connected to the emergency chlorine gas outlet of the emergency chlorine gas collection unit.

[0011] Preferably, the emergency chlorine gas collection unit includes an emergency chlorine gas exhaust hood and a chlorine gas tail gas distribution platform installed in each unit location. The inlet of the chlorine gas tail gas distribution platform is connected to a liquid chlorine tanker, a liquid chlorine storage tank, a liquid chlorine packaging pump, a second vapor-liquid separator, and a chlorine gas cylinder. One outlet of the chlorine gas tail gas distribution platform is connected to a chlorine condenser, and the other outlet of the chlorine gas distribution platform and the emergency chlorine gas outlet of the emergency chlorine gas exhaust hood are connected to the emergency chlorine gas inlet (external chlorine gas absorption device) of the sodium hypochlorite absorption tower.

[0012] Preferably, an exhaust gas buffer tank is provided between the liquid chlorine tanker and the Nash pump.

[0013] Preferably, the liquid chlorine packaging unit includes a liquid chlorine packaging scale for real-time weighing when the liquid chlorine cylinder is filled with liquid chlorine, and a liquid chlorine packaging re-weighing scale for checking the weight after the liquid chlorine cylinder is filled.

[0014] Preferably, the sodium hypochlorite absorption unit includes a circulating cooler, which is installed on the pipeline connecting the alkali outlet of the sodium hypochlorite circulating tank and the alkali sprayer inside the sodium hypochlorite absorption tower.

[0015] Preferably, the tail gas outlet at the top of the sodium hypochlorite absorption tower is connected to a tail gas fan.

[0016] Preferably, the compressed air device controls the internal pressure of the liquid chlorine tanker to be 0.15~0.2 MPa higher than the pressure of the liquid chlorine storage tank.

[0017] Preferably, the temperature of the liquid chlorine cylinder is not greater than 40°C.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This utility model discloses a liquid chlorine tanker unloading and liquid chlorine packaging on-site configuration system, which includes an unloading unit, a liquid chlorine packaging unit, a chlorine liquefaction unit, and an emergency chlorine collection unit. It constructs an integrated liquid chlorine unloading system that integrates unloading, packaging, and liquid chlorine condensation and recovery. Through the cooperation between the various units, it achieves fast and safe liquid chlorine unloading, solving the problems of complex operation, cumbersome process, reliance on manual labor, and low degree of automation in the existing technology; as well as the pollution risk caused by poor equipment sealing. It greatly reduces the safety hazards of leakage or improper discharge that could seriously pollute the environment, harm the ecosystem, and endanger human health. Attached Figure Description

[0020] Figure 1 This is a field schematic diagram of the unloading unit, liquid chlorine packaging unit, chlorine liquefaction unit, and emergency chlorine collection unit of this utility model;

[0021] Figure 2 This is a schematic diagram of the sodium hypochlorite absorption unit of this utility model in the field.

[0022] In the diagram: 1. Unloading arm; 2. Liquid chlorine storage tank; 3. Liquid chlorine tanker; 4. Compressed air pipeline; 5. Liquid chlorine packaging pump; 6. Liquid chlorine cylinder; 7. First vapor-liquid separator; 8. Chlorine condenser; 9. Nessler pump; 10. Second vapor-liquid separator; 11. Sodium hypochlorite absorption tower; 12. Alkali storage tank; 13. Tap water storage tank; 14. Alkali mixing tank; 15. Sodium hypochlorite circulation tank; 16. Alkali mixing transfer pump; 17. Sodium hypochlorite circulation pump; 18. Alkali sprayer; 19. Exhaust gas outlet; 20. Emergency chlorine inlet; 21. Emergency chlorine outlet; 22. Emergency chlorine exhaust hood; 23. Chlorine exhaust gas distribution platform; 24. Exhaust gas buffer tank; 25. Liquid chlorine packaging scale; 26. Liquid chlorine packaging re-weighing; 27. Circulating cooler; 28. Exhaust gas fan. Detailed Implementation

[0023] The present invention will now be described clearly and completely with reference to the accompanying drawings of the embodiments thereof.

[0024] like Figure 1 , Figure 2As shown, a liquid chlorine tanker unloading and liquid chlorine packaging on-site configuration system includes an unloading unit, a liquid chlorine packaging unit, a chlorine liquefaction unit, an emergency chlorine gas collection unit, and a sodium hypochlorite absorption unit. The unloading unit includes an unloading position with an unloading arm 1 and a liquid chlorine storage tank 2. The unloading position is used to park the liquid chlorine tanker 3. The unloading arm 1 includes a liquid phase pipe and a gas phase pipe. The unloading arm 1 connects the liquid chlorine tanker 3 and the liquid chlorine storage tank 2 through the liquid phase pipe. The upper part of the liquid chlorine tanker 3 is connected to a compressed air device through a compressed air pipe 4. The liquid chlorine packaging unit includes a liquid chlorine packaging pump 5 and several liquid chlorine cylinders 6. The inlet of the liquid chlorine packaging pump 5 is connected to the liquid chlorine storage tank 2, and the outlet is detachably connected to each liquid chlorine cylinder 6. The chlorine liquefaction unit includes a first vapor-liquid separator 7 and a chlorine condenser 8. The first vapor-liquid separator 7 is connected to the vapor phase pipe of the unloading arm 1 via a Nash pump 9, and then connected to the liquid chlorine tank truck 3. The outlet of the first vapor-liquid separator 7 is connected to the chlorine condenser 8. The chlorine condenser 8 can use chlorofluorocarbons (CFCs) as a condensing agent. The liquid outlet of the chlorine condenser 8... The outlet is connected to a second vapor-liquid separator 10, and the outlet of the second vapor-liquid separator 10 is connected to a liquid chlorine storage tank 2. The sodium hypochlorite absorption unit includes a sodium hypochlorite absorption tower 11, an alkali storage tank 12, a tap water storage tank 13, an alkali mixing tank 14, and a sodium hypochlorite circulation tank 15. The alkali storage tank 12 and the tap water storage tank 13 are respectively connected to the alkali mixing tank 14 via a transfer pump. The transfer pump pumps 50% alkali solution from the alkali storage tank 12 and pure water from the tap water storage tank 13 into the alkali mixing tank 14 in a certain proportion to prepare an alkali solution of a certain concentration. The alkali mixing tank 14... The sodium hypochlorite circulation tank 15 is connected to the sodium hypochlorite absorption tower 11 via an alkali transfer pump 16. The upper end of the sodium hypochlorite circulation tank 15 is connected to the alkali outlet of the sodium hypochlorite absorption tower 11 via a pipeline. The bottom end of the sodium hypochlorite circulation tank 15 is connected to the alkali sprayer 18 inside the sodium hypochlorite absorption tower 11 via a sodium hypochlorite circulation pump 17. The top of the sodium hypochlorite absorption tower 11 is provided with a tail gas outlet 19. The sodium hypochlorite absorption tower 11 is provided with an emergency chlorine gas inlet 20, which is connected to the emergency chlorine gas outlet 21 of the emergency chlorine gas collection unit. The emergency chlorine gas collection unit includes an emergency chlorine gas exhaust hood 22 and a chlorine gas tail gas distribution platform 23, each located in a separate unit. The inlet of the chlorine gas tail gas distribution platform 23 is connected to a liquid chlorine tanker 3, a liquid chlorine storage tank 2, a liquid chlorine packaging pump 5, a second vapor-liquid separator 10, and a chlorine cylinder 6. One outlet of the chlorine gas tail gas distribution platform 23 is connected to a chlorine condenser 8, and the other outlet of the chlorine gas distribution platform 23 and the emergency chlorine gas outlet 21 of the emergency chlorine gas exhaust hood 22 are connected to the emergency chlorine gas inlet 20 of the sodium hypochlorite absorption tower 11. A tail gas buffer tank 24 is installed between the liquid chlorine tanker 3 and the Nessler pump 9 to buffer the chlorine gas flow.The liquid chlorine packaging unit includes a liquid chlorine packaging scale 25 for real-time weighing when liquid chlorine is filled into the liquid chlorine cylinder 6, and a liquid chlorine packaging re-weighing scale 26 for verifying the weight of the liquid chlorine cylinder 6 after it is filled. The liquid chlorine packaging scale 25 and the liquid chlorine packaging re-weighing scale 26 are used to accurately determine the weight of the liquid chlorine cylinder 6. The sodium hypochlorite absorption unit includes a circulating cooler 27, which is installed on the pipeline connecting the alkaline outlet of the sodium hypochlorite circulation tank 15 and the alkaline sprayer 18 inside the sodium hypochlorite absorption tower 11. During the process of generating sodium hypochlorite through spraying, the reaction generates a large amount of heat, which is carried out through the alkaline solution to the sodium hypochlorite circulation tank 15. Then, the high-temperature alkaline solution is cooled by cooling water through the circulating cooler 27, and the alkaline solution is recirculated for spraying. The tail gas outlet 19 at the top of the sodium hypochlorite absorption tower 11 is connected to a tail gas fan 28. The compressed air device controls the internal pressure of the liquid chlorine tank truck 3 to be 0.15~0.2 MPa higher than the pressure of the liquid chlorine storage tank 2. The temperature of the liquid chlorine cylinder 6 is not greater than 40°C.

[0025] The specific procedure for unloading liquid chlorine is as follows:

[0026] 1.1 After the liquid chlorine tanker truck 3 stops at the designated unloading position, connect the unloading arm 1 (liquid phase pipe and gas phase pipe), determine the target liquid chlorine storage tank 2 and the existing pressure parameters inside the storage tank, open the compressed air pipeline connected to the liquid chlorine tanker truck 3, pressurize the liquid chlorine tanker truck 3, and adjust the internal pressure of the liquid chlorine tanker truck 3 to be 0.15~0.2MPa higher than the pressure of the target liquid chlorine storage tank 2. Unload the truck using compressed air. After unloading, purge the remaining liquid chlorine in the pipeline with compressed air. After completion, close the valves at both ends of the liquid chlorine pipeline and close the compressed air pipeline connected to the liquid chlorine tanker truck 3.

[0027] 1.2 Open the gas phase valve of the unloading arm 1, and use the Nash pump 9 to pump the remaining liquid chlorine in the liquid chlorine tanker 3 to the chlorine condenser 8 for liquefaction. It is not allowed to pump out all the remaining liquid chlorine in the liquid chlorine tanker 3. A portion of liquid chlorine must be retained to maintain the positive pressure inside the liquid chlorine tanker 3.

[0028] The liquid chlorine packaging process flow is as follows:

[0029] 2.1 After the liquid chlorine cylinder 6 has passed the inspection, use the Nessler pump 9 to evacuate the residual liquid chlorine in the liquid chlorine cylinder 6, and at the same time check whether the temperature of the liquid chlorine cylinder 6 is less than 40°C, in preparation for liquid chlorine packaging.

[0030] 2.2 Using the liquid chlorine packaging pump 5, the liquid chlorine inside the fixed liquid chlorine storage tank 2 is pressurized and transported to the liquid chlorine packaging system, i.e., filling the liquid chlorine cylinder 6. Close attention must be paid to the ambient temperature and the temperature of the liquid chlorine cylinder 6 to ensure that the filling pressure of the liquid chlorine packaging pump 5 is less than the design pressure of the liquid chlorine cylinder 6. If the filling pressure is too high, the reflux regulating valve will automatically open to adjust the filling pressure. During the filling process, if the temperature of the liquid chlorine cylinder 6 exceeds 40℃, liquid chlorine filling must be stopped immediately.

[0031] 2.3 After being weighed by the liquid chlorine packaging scale 25, the filling is stopped when the filling weight reaches the set value. At the same time, the filled liquid chlorine cylinder 6 is weighed again by the liquid chlorine packaging scale 26 for inspection. The error of the re-inspection weight is not allowed to exceed ±1% of the filling amount.

[0032] Chlorine liquefaction process flow:

[0033] 3.1 The residual liquid chlorine during the unloading and packaging of liquid chlorine is drawn and pressurized by the Nash pump 9. After passing through the tail gas buffer tank 24 and the first vapor-liquid separator 7, the pressurized chlorine gas is transported to the chlorine condenser 8 at 0.3 MPa. The chlorine condenser 8 is condensed to -20°C using Freon refrigerant, so that the pressurized chlorine gas is condensed into liquid chlorine. After passing through the second vapor-liquid separator 10, the gas and liquid phases are separated. The liquid chlorine flows into the corresponding liquid chlorine storage tank 2 by gravity. The non-condensable tail gas in the second vapor-liquid separator 10 goes to the sodium hypochlorite absorption unit after passing through the tail gas distribution station 23.

[0034] Sodium hypochlorite absorption process flow

[0035] 4.1 The liquid alkali in the 50% alkali storage tank 12 is pumped to the alkali mixing tank 14 in a certain amount using a transfer pump. At the same time, the tap water in the tap water storage tank 13 is pumped to the alkali mixing tank 14 in a quantitative amount using a transfer pump. The two are mixed to form a 15-18% dilute alkali solution. The prepared dilute alkali is then pumped to the sodium hypochlorite circulation tank 15 for later use using the alkali mixing transfer pump 16.

[0036] 4.2 The waste chlorine gas from the unloading, packaging, and liquefaction processes of liquid chlorine is distributed via the chlorine tail gas distribution station 23 and then enters the bottom of the sodium hypochlorite absorption tower 11 through the emergency chlorine inlet 20. Inside the tower, it reacts counter-currently with the alkaline solution sprayed from the top, generating sodium hypochlorite. The heat generated during the reaction is carried away by the alkaline solution to the sodium hypochlorite circulation tank 15, then carried away by cooling water after passing through the sodium hypochlorite circulation pump 17 and the circulation cooler 27. The alkaline solution is then recirculated for spraying. When the alkaline content of the sodium hypochlorite circulating tank 15 is sampled and analyzed to be <1-3%, the concentration of sodium hypochlorite in the product is deemed to meet the requirements. Sodium hypochlorite is then pumped to the finished sodium hypochlorite tank using the sodium hypochlorite circulation pump 17. Non-absorbable gases exit from the top of the sodium hypochlorite absorption tower 11 and are discharged into the atmosphere via the tail gas fan 28.

[0037] Based on the structure and process flow of this utility model, the liquid chlorine tanker unloading and liquid chlorine packaging on-site configuration system of this utility model is equipped with an unloading unit, a liquid chlorine packaging unit, a chlorine liquefaction unit, and an emergency chlorine collection unit, etc., to build an integrated liquid chlorine unloading system that integrates unloading, packaging, and liquid chlorine condensation and recovery. Through the cooperation between the various units, it achieves fast and safe liquid chlorine unloading, and solves the problems of complex operation, cumbersome process, reliance on manual labor, and low degree of automation in the prior art; as well as the pollution risk caused by poor equipment sealing. It greatly reduces the safety hazards of leakage or improper discharge that could seriously pollute the environment, harm the ecosystem and human health.

Claims

1. A liquid chlorine tank car unloading and liquid chlorine packaging site configuration system, characterized by, The package unloading unit, the liquid chlorine package unit, the chlorine gas liquefaction unit and the accident chlorine gas collection unit, the unloading unit includes the unloading position arranged with the unloading crane pipe and the liquid chlorine storage tank, the unloading crane pipe connects the liquid chlorine tank car and the liquid chlorine storage tank through the liquid phase pipe, the upper part of the liquid chlorine tank car is connected with the compressed air device through the compressed air pipe; The liquid chlorine package unit includes a liquid chlorine package pump and a plurality of liquid chlorine cylinders, the liquid chlorine package pump inlet is connected with the liquid chlorine storage tank, and the outlet is detachably connected with each liquid chlorine cylinder; The chlorine gas liquefaction unit includes a first vapor-liquid separator and a chlorine gas condenser, the first vapor-liquid separator is connected with the unloading crane pipe vapor pipe through the Nash pump and the liquid chlorine tank car, the outlet of the first vapor-liquid separator is connected with the chlorine gas condenser, the liquid outlet of the chlorine gas condenser is connected with the second vapor-liquid separator, and the liquid outlet of the second vapor-liquid separator is connected with the liquid chlorine storage tank.

2. The liquid chlorine tank car unloading and liquid chlorine packaging site configuration system of claim 1, wherein, The accident chlorine gas collection unit includes an accident chlorine gas exhaust hood arranged in each unit position and a chlorine tail gas distribution table, the chlorine tail gas distribution table is connected with the liquid chlorine tank car, the liquid chlorine storage tank, the liquid chlorine package pump, the second vapor-liquid separator and the chlorine cylinder, one outlet of the chlorine tail gas distribution table is connected with the chlorine gas condenser, the other outlet of the chlorine tail gas distribution table and the accident chlorine gas outlet of the accident chlorine gas exhaust hood are connected with the external chlorine gas absorption device.

3. The liquid chlorine tank car unloading and liquid chlorine packaging site configuration system of claim 2, wherein, The tail gas buffer tank is arranged between the liquid chlorine tank car and the Nash pump.

4. The liquid chlorine tank car unloading and liquid chlorine packaging site configuration system of claim 1, wherein, The liquid chlorine package unit includes a liquid chlorine package scale for real-time weighing when the liquid chlorine cylinder is filled with liquid chlorine, and a liquid chlorine package re-scale for checking the weight after the liquid chlorine cylinder is filled.

5. The liquid chlorine tank car unloading and liquid chlorine packaging site configuration system of claim 1 wherein, The compressed air device controls the internal pressure of the liquid chlorine tank car to be greater than the pressure of the liquid chlorine storage tank by 0.15-0.2 Mpa.

6. The liquid chlorine tank car unloading and liquid chlorine packaging site configuration system of claim 1 wherein, The temperature of the liquid chlorine cylinder is not greater than 40 DEG C.

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