A closed-loop chlorine sampling device for a vaporization buffer tank

Abstract

This utility model relates to a closed-loop chlorine sampling device using a vaporization buffer tank in the field of closed sampler technology. The system sampling tube is perforated and connected to a closed sampling cabinet, and sequentially connected in series through an inlet control valve, a sampling cylinder, and a system vent pipe to an outlet control valve, finally exiting the closed sampling cabinet through a vent pipe. An upper control valve and a lower control valve are correspondingly installed at the upper and lower ends of the sampling cylinder. A nitrogen purge tube is perforated and connected to the closed sampling cabinet, and a purge control valve is installed on the nitrogen purge tube. A purge connecting pipe connects the nitrogen purge tube to the system sampling tube. A bypass pressure relief pipe and a circulation control valve, connected in parallel with the sampling cylinder, are connected between the system sampling tube and the system vent pipe. A system pressure gauge is installed on the system vent pipe. This closed-loop sampling device increases the isolation and protection of the chlorine sampling system, improves the purity of chlorine samples, enhances the accuracy of chlorine sampling and detection, and improves the convenience and efficiency of chlorine sampling operations.

Description

Technical Field

[0001] This utility model belongs to the technical field of closed samplers, specifically relating to a closed chlorine sampling device for a vaporization buffer tank. Background Technology

[0002] Chlorinated paraffin is typically produced by reacting liquid paraffin and chlorine gas in a reactor. Chlorine, the main reactant, is usually obtained by vaporizing liquid chlorine in a vaporizer. The vaporized chlorine is then sent to a buffer tank for temporary storage before being fed into the reactor. The quality of the chlorine gas used in the reaction directly affects the quality of the chlorinated paraffin product. Therefore, sampling and testing of the chlorine gas in the chlorine pipeline is necessary in the chlorinated paraffin production system. Current chlorine sampling methods involve connecting a sampling tube and valve directly to the chlorine pipeline after the buffer tank. During sampling, a sampling cylinder is connected to the sampling tube, and the sampling valve is opened to collect the chlorine gas. However, some residual impurities inevitably remain in the sampling tube, affecting the accuracy of the sampling results. Furthermore, small leaks of chlorine gas may occur during sampling, and since chlorine is a highly toxic gas, it poses a safety hazard to sampling personnel. Therefore, there is an urgent need to design a more accurate and safer chlorine sampling device. Utility Model Content

[0003] In view of the above situation, this utility model provides a closed chlorine sampling device for a vaporization buffer tank, which can effectively improve the safety of chlorine sampling operation and improve the accuracy of chlorine sampling and detection.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A closed-loop chlorine sampling device for a vaporization buffer tank includes a closed sampling cabinet and a chlorine sampling system installed inside the cabinet. The chlorine sampling system includes a sampling cylinder, a system sampling tube, an inlet control valve, a nitrogen purge pipe, a system vent pipe, and an outlet control valve. The system sampling tube is perforated and connected to the closed sampling cabinet, and then sequentially connected in series through the inlet control valve, the sampling cylinder, and the system vent pipe to the outlet control valve. Finally, it exits the closed sampling cabinet through a vent pipe. The inlet end of the system sampling tube is connected to the chlorine pipeline network at the rear end of the vaporization buffer tank. The sampling cylinder is a cylindrical cavity structure. The system comprises an upper control valve and a lower control valve at its upper and lower ends, respectively. A nitrogen purge pipe is perforated and connected to a sealed sampling cabinet. A purge control valve is installed on the nitrogen purge pipe. A purge connecting pipe connects the nitrogen purge pipe at the rear end of the purge control valve to the system sampling pipe at the rear end of the inlet control valve. A bypass pressure relief pipe, connected in parallel with the sampling cylinder, is connected between the system sampling pipe and the system vent pipe. A circulation control valve is installed on the bypass pressure relief pipe. A system pressure gauge is installed at the connection between the bypass pressure relief pipe and the system vent pipe to monitor the gas pressure in the entire chlorine sampling system pipeline in real time.

[0006] Furthermore, the sealed sampling cabinet is a rectangular cavity cabinet with a side-opening cabinet door on the front side. The left side of the cabinet door is hinged to the left side wall of the sealed sampling cabinet, and the right side of the cabinet door is locked to the right side wall of the sealed sampling cabinet. Sealing strips are provided on the inner sides of the four edges of the cabinet door to improve the airtightness of the sealed sampling cabinet.

[0007] Furthermore, the front end of the system sampling tube outside the sealed sampling cabinet is also equipped with a sampling inlet valve, which serves as the main inlet valve of the chlorine sampling system to control the on / off of the chlorine source. The front end of the system sampling tube is connected to the chlorine pipeline network at the rear end of the gasification buffer tank in the existing chlorinated paraffin production system.

[0008] Furthermore, a purge inlet valve is also provided at the front end of the nitrogen purge pipe outside the sealed sampling cabinet. This valve serves as the main gas source valve for nitrogen purge, controlling the on / off of the nitrogen source in the entire chlorine sampling system. It also acts as an isolation valve between the chlorine sampling system and the nitrogen pipeline network.

[0009] Furthermore, a venting valve is provided at the front end of the system venting pipe outside the sealed sampling cabinet to control the connection and isolation between the chlorine sampling system and the external exhaust gas treatment system.

[0010] Furthermore, the system sampling tube, nitrogen purging tube, system venting tube, and bypass pressure relief tube are each fixedly connected to the inner wall of the back panel of the sealed sampling cabinet via pipe clamps.

[0011] Furthermore, the upper and lower ends of the sampling cylinder are each detachably connected to the inner wall of the back panel of the sealed sampling cabinet via elastic tube clamps. A grip handle is also provided on the outer wall of the sampling cylinder to facilitate gripping and inserting / removing the sampling cylinder.

[0012] Furthermore, the upper control valve and lower control valve of the sampling cylinder are respectively connected to the system vent pipe and the system sampling pipe via upper quick-connect fittings and lower quick-connect fittings, and the lower quick-connect fitting is connected to the system sampling pipe via a braided flexible hose.

[0013] Furthermore, a chlorine detector is installed inside the sealed sampling cabinet, and an exhaust fan is installed on the side wall of the cabinet. The exhaust fan is connected to the exhaust gas treatment system via a corrugated duct. If a chlorine leak occurs in the chlorine sampling system, the chlorine detector will sound an alarm and automatically activate the exhaust fan to draw the leaked chlorine into the exhaust gas treatment system. Sampling personnel can immediately close the cabinet door to prevent the leaked chlorine from spreading and simultaneously notify maintenance personnel to promptly repair the chlorine sampling system.

[0014] This utility model also includes other components that enable its normal use, all of which are conventional means in the field. In addition, devices or components not limited in this utility model, such as vaporizers, vaporization buffer tanks, chlorine pipelines, nitrogen pipelines, chlorine cylinders, quick-connect couplings, chlorine detectors, exhaust fans, and exhaust gas treatment systems, all adopt existing technologies in the field.

[0015] The beneficial effects of this utility model are as follows:

[0016] The vaporization buffer tank chlorine gas sealed sampling cabinet provided by this utility model improves the leak-proof safety of the chlorine gas sampling system by adding a sealed sampling cabinet to isolate and protect the chlorine gas sampling system from the external environment, and by adding nitrogen purging facilities and chlorine gas circulation pipelines. This ensures the purity of the sampled chlorine gas and improves the accuracy of chlorine gas sampling and detection. At the same time, the sampling cylinder adopts a quick-connect plug-in connection method, which helps to further improve the convenience and efficiency of chlorine gas sampling operations. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the external structure of the vaporization buffer tank and the chlorine gas sealed sampling cabinet in this utility model.

[0018] Figure 2 for Figure 1 Schematic diagram of the internal structure of the chlorine gas sealed sampling cabinet in the gasification buffer tank;

[0019] Figure 3 for Figure 2 A schematic diagram of the overall structure of the chlorine sampling system. Detailed Implementation

[0020] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0021] It should be noted that the terms "up," "down," "front," "back," "left," "right," "inner," and "outer," which indicate directions or positional relationships, are based on the attached drawings and are used only for ease of description.

[0022] Example 1

[0023] like Figure 1-3 As shown, a closed sampling device for chlorine gas in a vaporization buffer tank includes a closed sampling cabinet 1 and a chlorine gas sampling system installed inside the closed sampling cabinet. The chlorine gas sampling system includes a sampling cylinder 2, a system sampling pipe 3, an inlet control valve 4, a nitrogen purging pipe 5, a system venting pipe 6, and an outlet control valve 7.

[0024] The system sampling tube is inserted into the sealed sampling cabinet through a perforation at the lower left of the sealed sampling cabinet, and is connected in series through the inlet control valve, the sampling cylinder and the system vent pipe to the outlet control valve. Finally, it exits from the upper left of the sealed sampling cabinet through the vent pipe 8 and is connected to the exhaust gas treatment system (not shown in the figure). The inlet end of the system sampling tube is connected to the chlorine gas pipeline network (not shown in the figure) at the rear end of the gasification buffer tank (not shown in the figure).

[0025] The sampling cylinder has a cylindrical cavity structure, with an upper control valve 9 and a lower control valve 10 at its upper and lower ends respectively. When both upper and lower control valves are closed, the sampling cylinder is a sealed tank. When both upper and lower control valves are open, the sampling cylinder is equivalent to a connected pipe.

[0026] The nitrogen purge pipe is inserted into the sealed sampling cabinet through a parallel perforation above the system sampling pipe. A purge control valve 11 is installed on the nitrogen purge pipe. A purge connecting pipe 12 connects the nitrogen purge pipe at the rear end of the purge control valve to the system sampling pipe at the rear end of the inlet control valve. A bypass pressure relief pipe 13, which is connected in parallel with the sampling cylinder, is connected between the system sampling pipe and the system vent pipe. A circulation control valve 14 is installed on the bypass pressure relief pipe. A system pressure gauge 15 is installed at the connection between the bypass pressure relief pipe and the system vent pipe to monitor the gas pressure in the entire chlorine sampling system pipeline in real time.

[0027] The sealed sampling cabinet is a rectangular cavity cabinet. The front of the sealed sampling cabinet is provided with a side-opening cabinet door 16. The left side of the cabinet door is rotatably hinged to the left side wall of the sealed sampling cabinet via a hinge 17. The right side of the cabinet door is opened and closed by a cabinet door lock 18. Sealing strips 19 are provided on the inner side of the four edges of the cabinet door to improve the airtightness of the sealed sampling cabinet.

[0028] Example 2

[0029] Based on Example 1, a sampling inlet valve 20 is also provided at the front end of the system sampling tube outside the sealed sampling cabinet. This valve serves as the main inlet valve of the chlorine sampling system and is used to control the flow of chlorine. The front end of the system sampling tube is connected to the chlorine pipeline network at the rear end of the vaporization buffer tank in the existing chlorinated paraffin production system.

[0030] The nitrogen purging pipe outside the sealed sampling cabinet is also equipped with a purging inlet valve 21, which serves as the main gas source valve for nitrogen purging. It controls the on / off of the nitrogen source in the entire chlorine sampling system and also acts as an isolation valve between the chlorine sampling system and the nitrogen pipeline network.

[0031] The system vent pipe outside the sealed sampling cabinet is also equipped with a vent valve 22, which is used to control the connection and isolation between the chlorine sampling system and the external exhaust gas treatment system.

[0032] The inlet control valve, outlet control valve, purge control valve, circulation control valve, and the upper and lower inlet control valves of the sampling cylinder are all manual needle valves; the sampling inlet valve, purge inlet valve, and venting valve are all manual ball valves. Both the manual needle valves and manual ball valves are existing technologies in this field and will not be described in detail here.

[0033] The system sampling tube, nitrogen purging tube, system venting tube, and bypass pressure relief tube are each fixedly connected to the inner wall of the back panel of the sealed sampling cabinet via pipe clamps 23.

[0034] The upper and lower ends of the sampling cylinder are each pluggably and snap-fitted onto the inner wall of the back panel of the sealed sampling cabinet via elastic tube clamps 24, facilitating quick insertion and removal of the sampling cylinder. A handle 25 is also provided on the outer wall of the sampling cylinder for easy gripping and insertion / removal of the sampling cylinder.

[0035] The upper and lower control valves of the sampling cylinder are respectively connected to the system vent pipe and the system sampling pipe via upper quick-connect connector 26 and lower quick-connect connector 27. The upper and lower control valves of the sampling cylinder are also connected to right-angle elbows at their outer ends for easy connection with the upper and lower quick-connect connectors. The lower quick-connect connector is connected to the system sampling pipe via a stainless steel braided flexible hose 28.

[0036] The sealed sampling cabinet is also equipped with a chlorine detector 29. An exhaust fan 30 is installed on the side wall of the cabinet, and its control switch is located in an external control box (not shown in the figure). The exhaust fan is connected to the exhaust gas treatment system via a corrugated duct 31. During sampling, if a chlorine leak occurs in the chlorine sampling system, the chlorine detector will sound an alarm and automatically activate the exhaust fan to draw the leaked chlorine into the exhaust gas treatment system. Sampling personnel can immediately close the cabinet door to prevent the leaked chlorine from spreading and simultaneously notify maintenance personnel to repair the chlorine sampling system promptly. The exhaust gas treatment system is existing technology in chlorinated paraffin production systems, and its specific configuration will not be detailed here.

[0037] The working principle of this utility model is as follows:

[0038] Before chlorine sampling, ensure all valves in the chlorine sampling system (hereinafter referred to as the system) are closed. First, install the sampling cylinder, then open the purge inlet valve, purge control valve, circulation control valve, outlet control valve, and vent valve to purge the residual impurity gas in the system pipeline. Open the upper and lower control valves of the sampling cylinder, close the circulation control valve, and purge the residual impurity gas in the sampling cylinder. Then close the purge control valve, open the sampling inlet valve, inlet control valve, and circulation control valve, and circulate the chlorine sample for 15 seconds to displace the residual nitrogen in the system. Finally, close the circulation control valve and circulate the chlorine sample... Circulate for 15 seconds to ensure the purity of the chlorine sample; at this time, the chlorine sample flows through the sampling cylinder to begin chlorine sampling; once the pressure gauge indicates that the cylinder is full of chlorine sample, close the upper and lower control valves of the sampling cylinder and the system inlet control valve; then open the circulation control valve and purge control valve to purge the system pipeline with nitrogen to displace any residual chlorine sample in the system, then close the purge control valve and purge inlet valve. Once the pressure gauge indicates that the pressure has dropped to atmospheric pressure, close all system valves, press to disconnect the upper quick-connect fitting, remove the sampling cylinder, and then disconnect the lower quick-connect fitting of the braided hose to complete the chlorine sampling.

[0039] The technical solution of this utility model is not limited to the specific embodiments described above. Without departing from the scope and spirit of the described embodiments, many modifications and changes will be obvious to those skilled in the art. Any technical modifications made within the spirit and principles of this utility model shall fall within the protection scope of this utility model.

Claims

1. A chlorine-tight sampling device for a gasification surge tank, comprising a tight sampling cabinet, and a chlorine sampling system arranged in the tight sampling cabinet, characterized in that: The chlorine sampling system includes a sampling cylinder, a system sampling tube, an inlet control valve, a nitrogen purge tube, a system venting tube, and an outlet control valve. The system sampling tube is perforated and connected to a sealed sampling cabinet, and is connected in series through the inlet control valve, the sampling cylinder, and the system venting tube to the outlet control valve, and finally exits from the sealed sampling cabinet through a venting pipe. An upper control valve and a lower control valve are respectively installed at the upper and lower ends of the sampling cylinder. The nitrogen purge tube is perforated and connected to the sealed sampling cabinet. A purge control valve is installed on the nitrogen purge tube. A purge connecting pipe connects the nitrogen purge tube at the rear end of the purge control valve to the system sampling tube at the rear end of the inlet control valve. A bypass pressure relief pipe connected in parallel with the sampling cylinder is connected between the system sampling tube and the system venting tube. A circulation control valve is installed on the bypass pressure relief pipe, and a system pressure gauge is installed at the connection between the bypass pressure relief pipe and the system venting tube.

2. A chlorine-tight sampling device for a gasification surge tank according to claim 1, characterized in that The sealed sampling cabinet is a rectangular cavity cabinet. The front of the sealed sampling cabinet is equipped with a side-opening cabinet door. The left side of the cabinet door is hinged to the left side wall of the sealed sampling cabinet, and the right side of the cabinet door is locked to the right side wall of the sealed sampling cabinet. Sealing strips are provided on the inner side of the four edges of the cabinet door.

3. The chlorine gas sealed sampling device for a vaporization buffer tank according to claim 1, characterized in that: The front end of the system sampling tube outside the sealed sampling cabinet is also equipped with a sampling air inlet valve.

4. The chlorine gas sealed sampling device for a vaporization buffer tank according to claim 1, characterized in that: The nitrogen purge pipe on the outside of the sealed sampling cabinet is also equipped with a purge inlet valve.

5. The chlorine gas sealed sampling device for a vaporization buffer tank according to claim 1, characterized in that: The system vent pipe outside the sealed sampling cabinet is also equipped with a vent valve.

6. The chlorine gas closed-loop sampling device for a vaporization buffer tank according to claim 1, characterized in that: The system sampling tube, nitrogen purging tube, system venting tube, and bypass pressure relief tube are each fixedly connected to the inner wall of the back panel of the sealed sampling cabinet via pipe clamps.

7. The chlorine gas sealed sampling device for a vaporization buffer tank according to claim 1, characterized in that: The upper and lower ends of the sampling cylinder are each detachably connected to the inner wall of the back panel of the sealed sampling cabinet via elastic tube clamps, and a handle is also provided on the outer wall of the sampling cylinder.

8. The chlorine gas closed-loop sampling device for a vaporization buffer tank according to claim 1, characterized in that: The upper and lower control valves of the sampling cylinder are respectively connected to the system vent pipe and the system sampling pipe via upper and lower quick-connect fittings, and the lower quick-connect fitting is connected to the system sampling pipe via a flexible hose.

9. A closed-loop chlorine sampling device for a vaporization buffer tank according to claim 1, characterized in that: The sealed sampling cabinet is also equipped with a chlorine detector, and an exhaust fan is installed on the side wall of the sealed sampling cabinet. The exhaust fan is connected to the exhaust gas treatment system through a duct.

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