Liquid chlorine steel cylinder treatment device

Abstract

The utility model relates to the technical field of liquid chlorine treatment, in particular to a liquid chlorine steel cylinder treatment device and a using method. The device comprises a liquid chlorine steel cylinder, a gravity sensing base for sensing the weight of the liquid chlorine steel cylinder, and an evacuating and replacing unit which is communicated with the liquid chlorine steel cylinder and is used for removing residual chlorine in the liquid chlorine steel cylinder, the neutralizing unit is communicated with the liquid chlorine steel cylinder and is used for neutralizing residual chlorine; the purging and drying unit and the air tightness checking unit are sequentially arranged at the downstream of the evacuating and replacing unit; the liquid chlorine steel cylinder is provided with a gas-phase cylinder valve and a gas-phase distribution pipe which are communicated with the evacuation and replacement unit, and a liquid-phase cylinder valve and a liquid-phase distribution pipe which are communicated with the neutralization unit. The liquid chlorine steel cylinder treatment device has the effect of solving the problems that existing liquid chlorine steel cylinder treatment is tedious in operation and low in efficiency, and potential safety hazards exist.

Description

Technical Field

[0001] This application relates to the technical field of liquid chlorine treatment, and in particular to a liquid chlorine cylinder treatment device. Background Technology

[0002] In long-distance chlorine transportation, chlorine is primarily liquefied into liquid chlorine, which is then transported via cylinders or tank trucks. Many downstream companies using these cylinders do not have liquid chlorine storage tanks; instead, they connect the cylinders directly to buffer tanks, vaporizers, and then to the reactor. This process carries the risk of other materials flowing back into the liquid chlorine cylinders, causing contamination. These contaminants may react with the liquid chlorine during the next refill, potentially leading to explosions or other accidents. To prevent secondary disasters caused by cylinder contamination, chlor-alkali companies check returned liquid chlorine cylinders for residual chlorine, pressure, and weight. If the residual chlorine, pressure, or weight is low, the cylinders are replaced and cleaned before refilling. Alternatively, cylinders requiring regular inspection are also replaced and cleaned.

[0003] In related technologies, the method for handling liquid chlorine cylinders that may be contaminated and need to be handed over for regular inspection is as follows: first, the liquid chlorine cylinder is evacuated through the evacuation module, then transferred to the cleaning unit for rinsing with industrial water as needed, and then purging and drying are performed.

[0004] Regarding the aforementioned technologies, the overall process suffers from the following problems: Firstly, it requires the constant movement of the cylinders and disassembly of connecting pipes using a crane, making the operation cumbersome. Secondly, the liquid chlorine cannot be completely emptied during evacuation, and subsequent rinsing with water causes the chlorine gas to react with the water to form an acid that corrodes the cylinder. Furthermore, the water cannot completely remove the chlorine gas, resulting in some chlorine escaping during drainage, causing environmental pollution and affecting the health of operators. Moreover, using ordinary air to dry the cylinder after industrial water rinsing is inefficient. Therefore, the overall process has room for improvement. Utility Model Content

[0005] In order to improve the problems of cumbersome operation, low efficiency and safety hazards in the current liquid chlorine cylinder handling, this application provides a liquid chlorine cylinder handling device and its usage method.

[0006] Firstly, the liquid chlorine cylinder processing device provided in this application adopts the following technical solution:

[0007] A liquid chlorine cylinder processing device includes a liquid chlorine cylinder, a gravity sensing base for sensing the weight of the liquid chlorine cylinder, a vacuuming and replacement unit connected to the liquid chlorine cylinder for removing residual chlorine from the cylinder, a neutralization unit connected to the liquid chlorine cylinder for neutralizing residual chlorine gas, and a purging and drying unit and an airtightness inspection unit sequentially arranged downstream of the vacuuming and replacement unit. The liquid chlorine cylinder is provided with a gas phase cylinder valve and a gas phase distribution pipe for connecting to the vacuuming and replacement unit, and a liquid phase cylinder valve and a liquid phase distribution pipe for connecting to the neutralization unit. The liquid chlorine cylinder is provided with a top steel plug and a bottom steel plug.

[0008] The evacuation and replacement unit includes a chlorine purity analyzer, a tail gas absorption module, an analysis pipeline for connecting the gas phase distribution pipe and the chlorine purity analyzer, a first evacuation pipe for connecting the chlorine purity analyzer and the tail gas absorption module, and a second evacuation pipe for connecting the tail gas absorption module and the gas phase distribution pipe.

[0009] The neutralization unit includes an alkaline water module, an industrial water module, an alkaline water pipeline for connecting the liquid phase distribution pipe and the alkaline water module, and an industrial water pipeline for connecting the liquid phase distribution pipe and the industrial water module. The liquid phase distribution pipe is also connected to a drain pipe at a lower position, and a pH meter is installed on the drain pipe.

[0010] By adopting the above technical solution, the weight of the liquid chlorine cylinder is monitored in real time using a gravity-sensing base, enabling rapid determination of the remaining liquid chlorine level. The system integrates functions such as evacuation and replacement, neutralization, purging and drying, and airtightness checks into a single device, avoiding the cumbersome operations of frequently moving the cylinder and disassembling connecting pipes. The evacuation and replacement unit monitors the chlorine concentration in the exhaust gas in real time using a chlorine purity analyzer, ensuring that residual chlorine in the liquid chlorine cylinder is completely replaced during evacuation, preventing safety accidents caused by the reaction of residual chlorine with contaminants. The neutralization unit uses an alkaline water module and an industrial water module. Alkaline water is used to neutralize residual chlorine, followed by rinsing with industrial water, effectively preventing the formation of an acidic solution that could corrode the cylinder and reducing the risk of chlorine leakage. The airtightness check unit performs an airtightness test on the cylinder after processing, ensuring that it will not leak during subsequent filling. During evacuation, the exhaust gas is treated by an exhaust gas absorption module, preventing direct emission of chlorine into the environment and reducing environmental pollution. The various units work together to achieve precise control over the liquid chlorine cylinder handling process and improve the stability of the processing quality.

[0011] Furthermore, the evacuation and replacement unit also includes a gas source module and a first gas phase branch for connecting the gas source module and the gas phase distribution pipe.

[0012] By adopting the above technical solution, the gas source module can provide clean, dry replacement gas (such as nitrogen, dry air, or other inert gases). Introducing the replacement gas into the gas phase distribution pipe through the first gas phase branch can more effectively replace residual chlorine in the liquid chlorine cylinder. Introducing the replacement gas can more thoroughly remove residual chlorine from the cylinder, ensuring that the chlorine concentration inside the cylinder is reduced to a safe level, thereby reducing the risk of accidents caused by the reaction of residual chlorine with contaminants. During the replacement process, the replacement gas can dilute and carry away residual chlorine from the cylinder, reducing the residence time of chlorine in the cylinder and lowering the risk of chlorine leakage. Especially in cases where there is a possibility of leakage in the cylinder's connecting pipes or valves, the replacement gas can play a role in dilution and isolation.

[0013] Furthermore, the purging and drying unit is located downstream of the evacuation and replacement unit, and the purging and drying unit includes a heating module and a second gas phase branch for connecting the heating module, the gas source module and the gas phase distribution pipe.

[0014] By adopting the above technical solution, the heating module can heat the replacement gas provided by the gas source module to form a hot gas flow. After the hot gas flow enters the liquid chlorine cylinder, it can evaporate the moisture and residual liquid inside the cylinder more quickly, significantly improving drying efficiency and shortening drying time. The hot gas flow has better fluidity and diffusion, and can more evenly cover the inner wall and corners of the cylinder, avoiding dead corners caused by incomplete drying by cold gas flow, and ensuring that the inside of the cylinder is completely dry.

[0015] Furthermore, the airtightness inspection unit is located downstream of the purging and drying unit. The airtightness inspection unit includes a compressor, a drying module, and a pressure pipeline for connecting the compressor, the drying module, and the gas phase distribution pipe.

[0016] By employing the above technical solution, the airtightness inspection unit injects dry gas (such as nitrogen or dry air) into the cylinder using a pneumatic compressor and monitors pressure changes within the cylinder. If a leak is found, the pressure will gradually decrease, allowing for accurate detection of cylinder sealing issues. This enables timely identification and repair of leaks, preventing liquid chlorine leaks and ensuring safety during subsequent filling and use. The gas supplied by the pneumatic compressor is processed by a drying module to ensure it is dry and free of moisture. Using dry gas for airtightness inspection avoids misjudgments caused by moisture in the gas (such as condensation near leak points leading to insignificant pressure changes), improving the accuracy and reliability of the inspection.

[0017] Furthermore, the analytical pipeline is equipped with a first pressure reducing valve and a second pressure reducing valve at the front and rear ends of the chlorine purity analyzer, respectively, and a first pressure gauge is provided between the first pressure reducing valve and the gas phase distribution pipe.

[0018] By adopting the above technical solution, the first pressure reducing valve can reduce the pressure of the gas entering the chlorine purity analyzer, ensuring that the gas pressure entering the analyzer is stable and within a suitable range. The second pressure reducing valve can control the outlet pressure of the chlorine purity analyzer, avoiding excessive negative pressure and increasing measurement stability. Chlorine purity analyzers typically have certain requirements for gas pressure; the pressure reducing valves precisely control the gas pressure, preventing damage to the analyzer due to excessively high or low pressure, and improving its measurement accuracy and reliability. The first pressure gauge is installed between the first pressure reducing valve and the gas phase distribution pipe, allowing real-time monitoring of the gas pressure before pressure reduction. Operators can observe the pressure gauge reading to promptly determine whether the gas pressure is within the normal range, ensuring the normal operation of the entire evacuation and replacement unit.

[0019] Furthermore, the second evacuation pipe is equipped with an evacuation pipe control valve and a vacuum gauge.

[0020] By adopting the above technical solution, the control valve can achieve phased operation of the evacuation process. In the initial stage of evacuation, the pressure can be quickly reduced to shorten the time. As the target vacuum level approaches, the evacuation speed is slowed down to avoid over-evacuation or pressure fluctuations, thereby improving evacuation accuracy. The vacuum gauge can measure the vacuum level in the second evacuation tube in real time, providing operators with accurate pressure data and preventing equipment damage or cylinder deformation caused by excessively low pressure inside the cylinder.

[0021] Furthermore, the first gas phase branch is equipped with a first gas phase branch control valve and a second pressure gauge, and the second gas phase branch is equipped with a second gas phase branch control valve.

[0022] By adopting the above technical solution, with control valves for both the first and second gas phase branches, operators can precisely control the flow rates of the replacement gas and the drying gas, preventing backflow between different pipelines, ensuring unidirectional gas flow, and avoiding pollution or safety accidents caused by backflow. A second pressure gauge is installed on the first gas phase branch to monitor the pressure of the replacement gas in real time. The second gas phase branch regulates the pressure of the drying gas through its control valve, ensuring that the drying gas can efficiently enter the cylinder and remove moisture, thus improving drying efficiency.

[0023] Furthermore, the pneumatic pipeline is equipped with a switch valve and a third pressure gauge.

[0024] By adopting the above technical solution, the installation of the switching valve and the third pressure gauge makes the airtightness inspection process more intuitive and controllable. If problems such as abnormal pressure drop or failure to reach the set value occur during the airtightness inspection, the third pressure gauge can provide immediate feedback, helping operators quickly locate the fault and facilitating timely repair and maintenance.

[0025] Furthermore, the alkaline water pipeline is equipped with an alkaline water pipeline control valve, the industrial water pipeline is equipped with an industrial water pipeline control valve, and the drain pipeline is equipped with a drain pipeline control valve.

[0026] By employing the above technical solutions, the inflow of alkaline water is precisely controlled, ensuring that the flow rate and on / off state of the alkaline water can be flexibly adjusted during the neutralization of residual chlorine. This facilitates accurate neutralization based on the amount and concentration of residual chlorine in the cylinder, avoiding waste or incomplete neutralization of alkaline water. The inflow of industrial water is also controlled, ensuring precise control of its flow rate and on / off state during cylinder cleaning, thus optimizing the cleaning effect. The drain line control valve controls the discharge of liquid after cleaning, ensuring the controllability of the draining process. Operators can open or close the drain line at any time as needed to prevent liquid overflow or incomplete drainage.

[0027] Secondly, the method of using the liquid chlorine cylinder handling device provided in this application is as follows:

[0028] A method of using a liquid chlorine cylinder handling device includes the following steps:

[0029] S1: Place the liquid chlorine cylinder on the gravity sensor base, connect the gas phase cylinder valve to the gas phase distribution pipe, connect the liquid phase cylinder valve to the liquid phase distribution pipe, and open the gas phase cylinder valve.

[0030] S2: Based on the detection value of the liquid chlorine cylinder on the gravity sensor base, measure the remaining liquid chlorine, open the first and second pressure reducing valves, detect the purity of the residual chlorine in the liquid chlorine cylinder, measure the residual pressure through the first pressure gauge, and close the first and second pressure reducing valves after the detection is completed.

[0031] S3: Open the evacuation pipe control valve to evacuate. When the vacuum gauge reading is between -0.05 and -0.1 MPa, close the evacuation pipe control valve and open the first gas phase branch control valve to purge and replace the gas. When the second pressure gauge reading is between 0.3 and 0.6 MPa, close the first gas phase branch control valve.

[0032] S4: Repeat step S3 2 to 4 times, then open the first pressure reducing valve and the second pressure reducing valve, and check the purity of residual chlorine in the liquid chlorine cylinder. If the purity of residual chlorine is less than 0.5%, the replacement is over. Close the gas phase cylinder valve, the first pressure reducing valve and the second pressure reducing valve, and open the liquid phase cylinder valve.

[0033] S5: Open the alkaline water pipeline control valve to fill with water. According to the detection value of the liquid chlorine cylinder on the gravity sensor base, when the water volume reaches more than 90% of the filling weight of the liquid chlorine cylinder, close the alkaline water pipeline control valve, let it stand for 4 hours, open the drain pipeline control valve to drain the liquid. During the draining process, the pH meter will detect the drained liquid. If the pH is greater than 6, an alarm will be triggered, indicating that neutralization is complete. If the pH is less than 6, repeat the step.

[0034] S6: Tilt the liquid chlorine cylinder at 50-80° using the gravity sensor base, open the top / bottom steel plug of the liquid chlorine cylinder to drain the remaining liquid, open the industrial water pipeline control valve, and flush the liquid chlorine cylinder with industrial water for 10-30 minutes. Close the industrial water pipeline control valve, inspect the liquid chlorine cylinder from the top steel plug, and after confirming that the cleaning is complete, close the liquid phase cylinder valve and open the gas phase cylinder valve.

[0035] S7: Start the heating module, open the second gas phase branch control valve, heat the air or nitrogen to 40~100℃ and then purge and dry the cylinder. After purging, analyze the purging gas coming out of the top steel plug every 1 hour. If the water content is less than 100ppm (vol), the purging and drying is over. Then turn off the heating module and the second gas phase branch control valve.

[0036] S8: Install the top steel plug into the liquid chlorine cylinder, open the switch valve, and start the air compressor to pressurize. When the third pressure gauge shows 2.0 MPa, stop pressurizing. If the pressure does not change after holding the pressure for more than 10 minutes, the pressurization is over.

[0037] By adopting the above technical solutions, from residual chlorine detection, evacuation and replacement, neutralization and cleaning to purging, drying and airtightness checks, the cylinders are ensured to reach their optimal condition before filling. Steps S3 and S4, through repeated replacement and steps S5 and S6, through multiple cleanings, ensure that residual chlorine and contaminants in the liquid chlorine cylinders are thoroughly removed. Simultaneously, the operating conditions such as pressure, temperature, and time in each step are optimized to improve processing efficiency. Steps S2 and S4 precisely detect the purity of residual chlorine to ensure a thorough replacement process and avoid safety accidents caused by residual chlorine. Step S5 uses alkaline water for neutralization, and the neutralization effect is judged based on the pH value to prevent corrosion of the cylinders or environmental pollution caused by residual chlorine or acidic liquids. Step S8, through air pressure detection, ensures the cylinder's airtightness, preventing leakage of liquid chlorine during filling and use, further improving safety. Steps S5 and S6 precisely control the amount of alkaline water and industrial water used through a gravity-sensing base and control valve, avoiding resource waste and reducing wastewater discharge. Step S7 heats air or nitrogen using a heating module for purging and drying, improving drying efficiency, reducing drying time, and further optimizing resource utilization. Steps S2 and S4 detect the purity of residual chlorine in the exhaust gas, and step S5 detects the pH value of the discharged liquid to ensure that the exhaust gas and wastewater generated during the treatment process meet environmental protection requirements and reduce environmental pollution.

[0038] In summary, this application includes at least one of the following beneficial technical effects:

[0039] 1. An integrated liquid chlorine cylinder processing unit and optimized operating methods enhance the safety of the processing. The unit's evacuation and replacement unit, equipped with a chlorine purity analyzer and a tail gas absorption module, monitors residual chlorine purity in real time and treats tail gas during the replacement process, ensuring complete replacement of residual chlorine in the cylinder and preventing safety accidents caused by the reaction of residual chlorine with pollutants. The tail gas is discharged after absorption treatment, reducing chlorine pollution to the environment. The neutralization unit uses an alkaline water module and an industrial water module. Residual chlorine is neutralized with alkaline water followed by rinsing with industrial water, preventing direct contact between chlorine and water to form an acidic solution that corrodes the cylinder and reduces chlorine escape. The airtightness inspection unit performs an airtightness test on the cylinder after processing to ensure no leakage during subsequent filling, comprehensively guaranteeing the safety of the liquid chlorine cylinder processing process.

[0040] 2. The structure and operation of the liquid chlorine cylinder processing unit have been optimized to improve processing efficiency. The unit integrates functions such as evacuation and replacement, neutralization, purging and drying, and airtightness testing, avoiding the frequent movement of cylinders and disassembly of connecting pipes required in traditional methods, thus simplifying the processing flow. The evacuation and replacement unit precisely controls gas pressure through two-stage pressure reducing valves and pressure gauges, ensuring a rapid and thorough replacement process. The purging and drying unit is equipped with a heating module, which heats the replacement gas to form a hot airflow, rapidly evaporating moisture and residual liquid inside the cylinder, significantly shortening the drying time. The airtightness testing unit uses a compressor and drying module to provide drying gas for testing, ensuring a rapid and accurate testing process. Through these optimizations, the residence time of liquid chlorine cylinders during processing is reduced, increasing equipment turnover and utilization, and improving the overall processing efficiency of liquid chlorine cylinders.

[0041] 3. A series of environmentally friendly technologies reduce the environmental impact of liquid chlorine cylinder treatment. During the evacuation and replacement process, the exhaust gas is treated through an exhaust gas absorption module to prevent direct emission of chlorine into the environment, thus reducing air pollution. The neutralization unit uses alkaline water to neutralize residual chlorine. A pH meter monitors the acidity and alkalinity of the discharged liquid in real time to ensure that the neutralized liquid meets environmental protection requirements before discharge, preventing acidic liquid from polluting water bodies. The purging and drying unit uses a heating module to heat air or nitrogen for purging and drying, reducing the risk of chlorine residue and escape due to incomplete drying by cold airflow, lowering the possibility of environmental pollution, optimizing the liquid chlorine cylinder treatment process, reducing wastewater and exhaust gas emissions, and meeting the environmental protection requirements of modern industry. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the overall structure of a liquid chlorine cylinder processing device according to an embodiment of this application.

[0043] Figure 2 This is a schematic diagram of the overall structure of the liquid chlorine cylinder and gravity sensing base in an embodiment of this application.

[0044] Figure 3 This is a schematic diagram of the overall structure of the vacuum replacement unit in an embodiment of this application.

[0045] Figure 4 This is a schematic diagram of the overall structure of the unit in the embodiments of this application.

[0046] Figure 5 This is a schematic diagram of the overall structure of the purging and drying unit in an embodiment of this application.

[0047] Figure 6 This is a schematic diagram of the overall structure of the airtightness inspection unit in an embodiment of this application.

[0048] Explanation of reference numerals in the attached diagram: 1. Liquid chlorine cylinder; 11. Gas phase cylinder valve; 12. Liquid phase cylinder valve; 13. Top steel plug; 14. Bottom steel plug; 15. Chlorine-resistant high-pressure hose; 16. Gas phase distribution pipe; 17. Liquid phase distribution pipe; 2. Gravity sensor base; 21. Base; 22. Sensor tray; 23. Fixing bracket; 24. Rotating shaft; 3. Vacuum replacement unit; 31. Chlorine purity analyzer; 311. First pressure reducing valve; 312. Second pressure reducing valve; 313. First pressure gauge; 32. Tail gas absorption module; 33. Analysis pipeline; 34. First evacuation pipe; 35. Second evacuation pipe; 351. Vacuum pipe control valve; 352. Vacuum gauge; 36. Gas source module 37. First vapor phase branch; 371. First vapor phase branch control valve; 372. Second pressure gauge; 4. Neutralization unit; 41. Alkaline water module; 42. Industrial water module; 43. Alkaline water pipeline; 431. Alkaline water pipeline control valve; 44. Industrial water pipeline; 441. Industrial water pipeline control valve; 45. Drainage pipeline; 451. pH meter; 452. Drainage pipeline control valve; 5. Purge and drying unit; 51. Heating module; 52. Second vapor phase branch; 521. Second vapor phase branch control valve; 6. Air tightness inspection unit; 61. Air compressor; 62. Drying module; 63. Air pressure pipeline; 631. Switch valve; 632. Third pressure gauge. Detailed Implementation

[0049] To make the purpose, technical solution, and advantages of this application clearer, the following description is provided in conjunction with the appendix. Figure 1-6 The present application will be further described in detail with reference to the embodiments.

[0050] This application discloses a liquid chlorine cylinder processing device and its usage method. (Refer to...) Figure 1A liquid chlorine cylinder processing device includes a liquid chlorine cylinder 1, a gravity sensing base 2, a vacuuming and replacement unit 3, a neutralization unit 4, a purging and drying unit 5, and an airtightness inspection unit 6. The gravity sensing base 2 senses the weight of the liquid chlorine cylinder 1. The vacuuming and replacement unit 3 is connected to the liquid chlorine cylinder 1 and is used to remove residual chlorine from the cylinder. The neutralization unit 4 is connected to the liquid chlorine cylinder 1 and is used to neutralize residual chlorine gas in the cylinder. The purging and drying unit 5 and the airtightness inspection unit 6 are sequentially located downstream of the vacuuming and replacement unit 3. The purging and drying unit 5 heats the gas and purges and dries the cylinder. The airtightness inspection unit 6 detects the cylinder's sealing performance.

[0051] Reference Figure 1 and Figure 2 The liquid chlorine cylinder 1 is equipped with a gas phase valve 11 and a liquid phase valve 12 on one side for communication with the evacuation and replacement unit 3 and the neutralization unit 4. A top steel plug 13 and a bottom steel plug 14 are detachably connected to the side of the liquid chlorine cylinder 1 away from the valves. A chlorine-resistant high-pressure hose 15 is threadedly connected to the end of the gas phase valve 11 and the liquid phase valve 12 away from the liquid chlorine cylinder 1. A gas phase distribution pipe 16 is connected to the end of the chlorine-resistant high-pressure hose 15 connected to the gas phase valve 11, and a liquid phase distribution pipe 17 is connected to the end of the chlorine-resistant high-pressure hose 15 connected to the liquid phase valve 12.

[0052] In this embodiment, the gas cylinder is connected to the gas phase distribution pipe 16 and the liquid phase distribution pipe 17 via a chlorine-resistant high-pressure hose 15, making the connection more convenient and not affecting the easy movement of the gas cylinder after connection. The high-pressure chlorine-resistant hose can withstand the chlorine gas and high pressure in the system, and the threaded connection can better strengthen the connection point and prevent leakage.

[0053] The gravity-sensing base 2 includes a base 21, a sensing tray 22, a fixing bracket 23, and a rotating shaft 24. The sensing tray 22 is positioned above the base 21 and is used to support and measure the weight of the gas cylinder via gravity sensing. The fixing bracket 23 is fixedly connected to the upper side of the sensing tray 22 to hold the liquid chlorine gas cylinder 1 in place. The rotating shaft 24 is rotatably connected to the base 21 and fixedly connected to the bottom side of the sensing tray 22, providing better fixation when the gas cylinder is placed on the base. In this embodiment, the rotating shaft 24 can rotate from 0 to 180°, allowing the gas cylinder to rotate as well, enabling both horizontal and angled placement. The gravity-sensing base 2 can measure the weight of the gas cylinder, recording its weight before treatment and the amount of water entering the cylinder during neutralization.

[0054] When liquid chlorine cylinder 1 is returned to the factory, it is first placed horizontally on the induction tray 22 and secured with the fixing bracket 23. The weight of the cylinder is read through the induction tray 22 to confirm the weight of the returned liquid chlorine cylinder 1. Then, the liquid chlorine cylinder 1 is connected to the gas phase system and the liquid phase system respectively through the chlorine-resistant high-pressure hose 15 to avoid mutual interference between the gas phase system and the liquid phase system during processing.

[0055] Reference Figure 3 and Figure 5 The vacuum replacement unit 3 includes a chlorine purity analyzer 31, a tail gas absorption module 32, an analysis pipeline 33 for connecting the gas phase distribution pipe 16 and the chlorine purity analyzer 31, a first vacuum pipe 34 for connecting the chlorine purity analyzer 31 and the tail gas absorption module 32, a second vacuum pipe 35 for connecting the tail gas absorption module 32 and the gas phase distribution pipe 16, a gas source module 36, and a first gas phase branch 37 for connecting the gas source module 36 and the gas phase distribution pipe 16.

[0056] The analysis line 33 is equipped with a first pressure reducing valve 311 and a second pressure reducing valve 312 at the front and rear ends of the chlorine purity analyzer 31, respectively. These pressure reducing valves can reduce the pressure of chlorine gas entering and exiting the chlorine purity analyzer 31. A first pressure gauge 313 is installed between the first pressure reducing valve 311 and the gas phase distribution pipe 16 in the analysis line 33, which can detect the residual pressure in the liquid chlorine cylinder 1 while analyzing chlorine purity. The second evacuation pipe 35 is equipped with an evacuation pipe control valve 351 and a vacuum gauge 352 to monitor the vacuum level during the evacuation process. The first gas phase branch 37 is equipped with a first gas phase branch 37 control valve and a second pressure gauge 372 to monitor the pressure during charging, which is controlled between 0.3 and 0.5 MPa.

[0057] In this embodiment, the exhaust gas absorption module 32 includes a vacuum pump capable of creating negative pressure and a chlorine absorption tower capable of absorbing chlorine gas to produce sodium hypochlorite. This allows residual chlorine in the cylinder to be extracted via the vacuum pump for sodium hypochlorite production. The vacuum pump has a capacity of 0 to -0.1 MPa and a control parameter of -0.1 to -0.05 MPa to better control the pressure during evacuation. The gas source module 36 is preferably clean, dry compressed air or nitrogen with a dew point less than -50°C to prevent excessive moisture from forming an acid with chlorine gas and corroding the liquid chlorine cylinder 1.

[0058] Reference Figure 1 and Figure 4 The neutralization unit 4 includes an alkaline water module 41, an industrial water module 42, an alkaline water pipeline 43 connecting the liquid phase distribution pipe 17 and the alkaline water module 41, and an industrial water pipeline 44 connecting the liquid phase distribution pipe 17 and the industrial water module 42. In this embodiment, the alkaline water module 41 is preferably hydrogen scrubbing water from a chlor-alkali enterprise. On the one hand, hydrogen scrubbing water can be recycled and reused; on the other hand, while removing residual chlorine in the liquid chlorine cylinder 1, it can prevent the alkalinity in the cylinder from being too high, which would affect subsequent cleaning and filling.

[0059] The liquid phase distribution pipe 17 is connected to a drain pipe 45 at a low position, and a pH meter 451 is installed on the drain pipe 45. An alkaline water pipe 43 control valve is installed on the alkaline water pipe 43, an industrial water pipe 44 control valve is installed on the industrial water pipe 44, and a drain pipe 45 control valve is installed on the drain pipe 45. Industrial water from the industrial water module 42 enters the liquid chlorine cylinder 1 for cleaning. The drain pipe 45 is connected to the liquid phase distribution pipe 17 and is at a low position. Waste liquid after neutralization is discharged through the drain pipe 45. The pH meter 451 on the drain pipe 45 is used to determine whether the neutralization process is complete. When the pH meter reading is greater than 6, an alarm will be triggered.

[0060] Reference Figure 1 and Figure 5 The purging and drying unit 5 is located downstream of the evacuation and replacement unit 3. The purging and drying unit 5 includes a heating module 51 and a second gas phase branch 52 connecting the heating module 51, the gas source module 36, and the gas phase distribution pipe 16. A control valve for the second gas phase branch 52 is provided on the second gas phase branch 52. In this embodiment, the heating module is electrically heated, which can heat the gas to 40~120℃. By heating the purging gas during the drying process of the liquid chlorine cylinder 1, the drying time is accelerated.

[0061] Reference Figure 1 and Figure 6 The airtightness inspection unit 6 is located downstream of the purging and drying unit 5. The airtightness inspection unit 6 includes a compressor 61, a drying module 62, and a pressure pipeline 63 connecting the compressor 61, the drying module 62, and the gas phase distribution pipe 16. The pressure pipeline 63 is equipped with a switch valve 631 and a third pressure gauge 632. During the airtightness inspection, the gas is pressurized by the compressor 61 and then flows through the pressure pipeline 63, the drying module 62, the switch valve 631, the gas phase distribution pipe 16, and the chlorine-resistant high-pressure hose 15 into the liquid chlorine cylinder 1. The third pressure gauge 632 on the pressure pipeline 63 is used to monitor pressure changes during the airtightness inspection.

[0062] In this embodiment, the desiccant used in the drying module 62 is preferably a molecular sieve or other desiccant. The desiccant is used to dry the gas used during the airtightness test to prevent moisture from being carried into the liquid chlorine cylinder 1 after cleaning.

[0063] In this embodiment, the valves used in each unit, including the first pressure reducing valve 311, the second pressure reducing valve 312, the evacuation pipe control valve 351, the first gas phase branch control valve 37, the second gas phase branch control valve 52, the on / off valve 631, the alkaline water pipeline control valve 43, the industrial water pipeline control valve 44, and the drain pipeline control valve 45, can all be remotely controlled or automatically controlled according to a set program. This enables automated control of the evacuation and replacement unit 3, the neutralization unit 4, and other units, increasing the convenience of operation.

[0064] A method of using a liquid chlorine cylinder handling device includes the following steps:

[0065] S1: Place the liquid chlorine cylinder 1 on the gravity sensing base 2, connect the gas phase cylinder valve 11 to the gas phase distribution pipe 16, connect the liquid phase cylinder valve 12 to the liquid phase distribution pipe 17, and open the gas phase cylinder valve 11.

[0066] S2: Based on the detection value of liquid chlorine cylinder 1 on gravity sensor base 2, measure the remaining liquid chlorine, open the first pressure reducing valve 311 and the second pressure reducing valve 312, detect the purity of residual chlorine in liquid chlorine cylinder 1, measure the residual pressure through the first pressure gauge 313, and close the first pressure reducing valve 311 and the second pressure reducing valve 312 after the detection is completed.

[0067] S3: Open the evacuation pipe control valve 351 to evacuate. When the vacuum gauge 352 shows a value of -0.05 to -0.1 MPa, close the evacuation pipe control valve 351 and open the first gas phase branch control valve 37 to purge and replace the gas. When the second pressure gauge 372 shows a value of 0.3 to 0.6 MPa, close the first gas phase branch control valve 37.

[0068] S4: Repeat step S3 2 to 4 times, then open the first pressure reducing valve 311 and the second pressure reducing valve 312 to check the purity of residual chlorine in liquid chlorine cylinder 1. If the purity of residual chlorine is less than 0.5%, the replacement is over. Close the gas phase cylinder valve 11, the first pressure reducing valve 311, the second pressure reducing valve 312, and open the liquid phase cylinder valve 12.

[0069] S5: Open the control valve of alkaline water pipeline 43 to fill with water. According to the detection value of liquid chlorine cylinder 1 on gravity sensor base 2, when the water volume reaches more than 90% of the filling weight of liquid chlorine cylinder 1, close the control valve of alkaline water pipeline 43, let it stand for 4 hours, open the control valve of drain pipeline 45 to drain the liquid. During the draining process, pH meter 451 detects the drained liquid. If the pH is greater than 6, an alarm will be triggered to indicate that neutralization is complete. If the pH is less than 6, repeat the step.

[0070] S6: Tilt the liquid chlorine cylinder 1 at 50-80° using the gravity sensor base 2, open the top steel plug 13 and bottom steel plug 14 of the liquid chlorine cylinder 1 to drain the remaining liquid, open the industrial water pipeline 44 control valve, and rinse the liquid chlorine cylinder 1 with industrial water for 10-30 minutes. Close the industrial water pipeline 44 control valve, inspect the liquid chlorine cylinder 1 from the top steel plug 13, and close the liquid phase cylinder valve 12 and open the gas phase cylinder valve 11 after confirming that the cleaning is complete.

[0071] S7: Start heating module 51, open control valve of second gas phase branch 52, heat air or nitrogen to 40~100℃ and then purge and dry the cylinder. After purging, analyze the purging gas coming out of the top steel plug 13 every 1 hour. If the water content is less than 100ppm (vol), the purging and drying is over. Close heating module 51 and control valve of second gas phase branch 52.

[0072] S8: Install the top steel plug 13 onto the liquid chlorine cylinder 1, open the switch valve 631, and start the air compressor 61 to pressurize. When the third pressure gauge 632 displays 2.0 MPa, stop pressurizing. If there is no pressure change after holding the pressure for more than 10 minutes, the pressurization is over.

[0073] The implementation principle of the liquid chlorine cylinder processing device in this application embodiment is as follows: The gravity sensing base 2 monitors the weight of the liquid chlorine cylinder 1 in real time through the sensing tray 22, and records the weight change of the cylinder before and after processing, providing data support for subsequent neutralization and cleaning operations. At the same time, the cylinder is fixed on the sensing tray 22 by the fixing bracket 23, and the cylinder can be placed flat or at an angle by the rotating shaft 24 to meet the operational needs of different processing stages.

[0074] The evacuation and replacement unit 3 replaces the gas cylinder with clean, dry gas supplied by the gas source module 36. The gas enters the cylinder after its pressure is controlled by two-stage pressure reducing valves. A chlorine purity analyzer 31 monitors the chlorine concentration in the exhaust gas in real time to ensure a thorough replacement process and reduce the residual chlorine concentration in the cylinder to a safe level. The exhaust gas absorption module 32 uses a vacuum pump and a chlorine absorption tower to convert the replaced chlorine into sodium hypochlorite, achieving harmless treatment of the exhaust gas.

[0075] Neutralization unit 4 neutralizes residual chlorine gas in the cylinder via alkaline water module 41. Alkaline water enters the cylinder through alkaline water pipeline 43. After the neutralization reaction is complete, the waste liquid is discharged through drain pipeline 45. pH meter 451 on drain pipeline 45 monitors the pH of the waste liquid in real time to ensure complete neutralization. Industrial water module 42 rinses the cylinder through industrial water pipeline 44 to further remove residues inside the cylinder.

[0076] The purging and drying unit 5 heats the gas supplied by the gas source module 36 to 40~100℃ via the heating module 51, forming a hot airflow to purge the cylinder. The hot airflow can quickly evaporate the moisture and residual liquid inside the cylinder, significantly improving drying efficiency. By periodically analyzing the moisture content of the purging gas, the complete drying of the cylinder's interior is ensured, further improving drying efficiency. High-temperature purging further removes residues from the cylinder.

[0077] The airtightness inspection unit 6 injects dry gas into the cylinder via a pneumatic compressor 61 and monitors the pressure changes inside the cylinder in real time using a third pressure gauge 632. If the cylinder is well-sealed, the pressure will remain stable; if a leak is present, the pressure will gradually decrease. This airtightness inspection ensures that the cylinder will not leak during subsequent filling processes, improving the safety of the entire process.

[0078] 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 liquid chlorine cylinder processing device, characterized in that: The system includes a liquid chlorine cylinder (1), a gravity sensing base (2) for sensing the weight of the liquid chlorine cylinder (1), a vacuuming and displacement unit (3) connected to the liquid chlorine cylinder (1) for removing residual chlorine from the cylinder, a neutralization unit (4) connected to the liquid chlorine cylinder (1) for neutralizing residual chlorine, and a purging and drying unit (5) and an airtightness inspection unit (6) sequentially located downstream of the vacuuming and displacement unit (3). The liquid chlorine cylinder (1) is provided with a gas phase cylinder valve (11) and a gas phase distribution pipe (16) for connecting to the vacuuming and displacement unit (3), and a liquid phase cylinder valve (12) and a liquid phase distribution pipe (17) for connecting to the neutralization unit (4). The liquid chlorine cylinder (1) is provided with a top steel plug (13) and a bottom steel plug (14). The vacuum replacement unit (3) includes a chlorine purity analyzer (31), a tail gas absorption module (32), an analysis pipeline (33) for connecting the gas phase distribution pipe (16) and the chlorine purity analyzer (31), a first vacuum pipe (34) for connecting the chlorine purity analyzer (31) and the tail gas absorption module (32), and a second vacuum pipe (35) for connecting the tail gas absorption module (32) and the gas phase distribution pipe (16). The neutralization unit (4) includes an alkaline water module (41), an industrial water module (42), an alkaline water pipeline (43) for connecting the liquid phase distribution pipe (17) and the alkaline water module (41), and an industrial water pipeline (44) for connecting the liquid phase distribution pipe (17) and the industrial water module (42). The liquid phase distribution pipe (17) is also connected to a drain pipe (45) at a lower position. A pH meter (451) is provided on the drain pipe (45).

2. The liquid chlorine cylinder processing device according to claim 1, characterized in that: The evacuation and replacement unit (3) further includes a gas source module (36) and a first gas phase branch (37) for connecting the gas source module (36) and the gas phase distribution pipe (16).

3. The liquid chlorine cylinder processing device according to claim 2, characterized in that: The purging and drying unit (5) is located downstream of the evacuation and replacement unit (3). The purging and drying unit (5) includes a heating module (51) and a second gas phase branch (52) for connecting the heating module (51), the gas source module (36) and the gas phase distribution pipe (16).

4. The liquid chlorine cylinder processing device according to claim 3, characterized in that: The airtightness inspection unit (6) is located downstream of the purging and drying unit (5). The airtightness inspection unit (6) includes a compressor (61), a drying module (62), and a pressure pipeline (63) for connecting the compressor (61), the drying module (62), and the gas phase distribution pipe (16).

5. The liquid chlorine cylinder processing device according to claim 1, characterized in that: The analysis pipeline (33) is provided with a first pressure reducing valve (311) and a second pressure reducing valve (312) at the front end and rear end of the chlorine purity analyzer (31), respectively. The analysis pipeline (33) is provided with a first pressure gauge (313) between the first pressure reducing valve (311) and the gas phase distribution pipe (16).

6. The liquid chlorine cylinder processing device according to claim 1, characterized in that: The second evacuation pipe (35) is equipped with an evacuation pipe control valve (351) and a vacuum gauge (352).

7. The liquid chlorine cylinder processing device according to claim 3, characterized in that: The first gas phase branch (37) is provided with a first gas phase branch (37) control valve and a second pressure gauge (372), and the second gas phase branch (52) is provided with a second gas phase branch (52) control valve.

8. The liquid chlorine cylinder processing device according to claim 4, characterized in that: The pneumatic pipeline (63) is equipped with a switch valve (631) and a third pressure gauge (632).

9. The liquid chlorine cylinder processing device according to claim 1, characterized in that: The alkaline water pipeline (43) is equipped with an alkaline water pipeline (43) control valve, the industrial water pipeline (44) is equipped with an industrial water pipeline (44) control valve, and the drain pipeline (45) is equipped with a drain pipeline (45) control valve.

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