Chlorine gas closed sampling device

Abstract

The utility model relates to the technical field of chlorine gas sampling, and discloses a closed chlorine gas sampling device which comprises a sampling bin, a sampling steel cylinder, a sampler and an evacuation mechanism, the sampling bin is provided with a sampling port, the sampling port is provided with a closed door for opening or closing the sampling port, the sampling steel cylinder and the sampler are positioned in the sampling bin, and the upper end of the sampling steel cylinder is connected with a gas inlet pipe; the sampling steel cylinder is communicated with the sampler through a sampling pipe, the vacuumizing mechanism is communicated with the sampling pipe through a first vacuumizing pipe, and the vacuumizing mechanism is communicated with the sampling bin through a second vacuumizing pipe. The chlorine gas sampling device has the beneficial effects that the sampling steel cylinder and the sampler are arranged in the sampling bin, so that the sampling operation can be completed in the sampling bin, and chlorine gas is prevented from leaking out of the sampling bin; by arranging the vacuumizing mechanism, the first vacuumizing pipe and the second vacuumizing pipe, when leakage occurs to a valve assembly in the sampling device, chlorine in a pipeline can be discharged in time, and chlorine leaked into a sampling bin can be pumped and recycled in time.

Description

Technical Field

[0001] The utility model relates to the technical field of chlorine sampling, in particular to a chlorine closed sampling device. Background Art

[0002] In the chlor-alkali production process, it is necessary to sample and analyze chlorine. In the traditional chlorine sampling device, there is a risk that chlorine overflows and poisons the operators, and the safety factor is relatively low. The Chinese utility model patent with the authorization announcement number of CN13209652U discloses a gaseous chlorine closed sampling device, which includes a support leg, a box body fixed on the support leg, a carbon steel pipe fixed on the inner side wall of the box body, the two ends of the carbon steel pipe extend to the outer sides of both sides of the box body, and an air inlet and an air outlet are respectively arranged at the two ends of the carbon steel pipe. A manual valve, a pressure gauge, a first three-way joint and a second three-way joint are installed on the carbon steel pipe. The first three-way joint is located between the manual valve and the pressure gauge, and the second three-way joint is located between the pressure gauge and the air outlet. The two three-way joints are respectively communicated with a sampling cylinder through a hose and a connecting pipe. After sampling in this application, there is still some chlorine remaining in the pipeline. Chlorine in the pipeline may leak during the process of disassembling the sampling cylinder; and if the chlorine in the pipeline leaks, the chlorine in the box body cannot be treated, and there is also a risk of chlorine overflow and poisoning. Content of the Utility Model

[0003] The purpose of the utility model is to effectively prevent chlorine leakage and overflow, and improve the safety performance of the chlorine closed sampler. In view of the above deficiencies of the prior art, a chlorine closed sampling device is proposed.

[0004] A chlorine closed sampling device includes a sampling bin, a sampling cylinder, a sampler and a evacuation mechanism. The sampling bin is provided with a sampling port, and the sampling port is provided with a closed door for opening or closing it. The sampling cylinder and the sampler are located in the sampling bin. The upper end of the sampling cylinder is connected with an air inlet pipe, the sampling cylinder is communicated with the sampler through a sampling pipe, a sampling valve is arranged on the sampling pipe, the evacuation mechanism is communicated with the sampling pipe through a first evacuation pipe, a first evacuation valve is arranged on the first evacuation pipe, the evacuation mechanism is communicated with the sampling bin through a second evacuation pipe, and a second evacuation valve is arranged on the second evacuation pipe.

[0005] By adopting the above technical solutions: a sampling bin is set, and both the sampling cylinder and the sampler are set in the sampling bin, so that the sampling operation can be completed in the sampling bin, avoiding chlorine leakage outside the sampling bin and ensuring the safety of the operators; by setting the first evacuation pipe and the evacuation mechanism, when there is a leakage in the internal valve assembly of the sampling device, the chlorine in the pipeline can be discharged in time; a second evacuation pipe is arranged on the sampling bin, and the chlorine leaked into the sampling bin can be evacuated and recycled to avoid the risk of chlorine overflow and poisoning.

[0006] The above technical solution is further set as follows: A plurality of sampling inlet pipes are connected in parallel to the inlet pipe, and a sampling inlet valve is provided on the sampling inlet pipe.

[0007] The above technical solution is further set as follows: The sampler includes a nitrogen trichloride sampling bottle and a conical sampling bottle that are sequentially connected to the sampling pipe.

[0008] The above technical solution is further set as follows: A vent pipe is connected to the first evacuation pipe, a vent valve is provided on the vent pipe, and the outlet end of the vent pipe is connected to an alkali absorption pool.

[0009] The above technical solution is further set as follows: The vent pipe is located on the side of the first evacuation valve close to the sampling pipe.

[0010] The above technical solution is further set as follows: A purge pipe is connected to the inlet pipe, a purge valve is provided on the purge pipe, and the inlet of the purge pipe is connected to a purge mechanism.

[0011] The above technical solution is further set as follows: The inlet pipe and the outlet pipe are connected by a bypass pipe, and a bypass valve is provided on the bypass pipe.

[0012] The above technical solution is further set as follows: A first cylinder needle valve is provided at one end of the inlet pipe close to the sampling cylinder, and a second cylinder needle valve is provided at one end of the sampling pipe close to the sampling cylinder.

[0013] The above technical solution is further set as follows: An evacuation main pipe is connected to the evacuation mechanism, an evacuation main valve is provided on the evacuation main pipe, and the first evacuation pipe and the second evacuation pipe are both connected to the evacuation main pipe.

[0014] The above technical solution is further set as follows: A gas detector is provided in the sampling chamber (1).

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

[0016] 1. A sampling chamber is provided, and the sampling cylinder and the sampler are both arranged in the sampling chamber. The sampling operation can be completed in the sampling chamber, avoiding the leakage of chlorine gas outside the sampling chamber and ensuring the safety of the operators. By providing the first evacuation pipe and the evacuation mechanism, when there is a leakage in the valve assembly inside the sampling device, the chlorine gas in the pipeline can be discharged in time. A second evacuation pipe is provided on the sampling chamber to evacuate and recover the chlorine gas leaked into the sampling chamber, avoiding the risk of chlorine gas overflow and poisoning.

[0017] 2. During sampling, the chlorine gas is first stored in the sampling cylinder. On the one hand, the amount of sampled chlorine gas can be quantified, and on the other hand, a part of the chlorine gas can be introduced to pre-displace the residual gas in the sampling cylinder and the pipeline of the sampling system in advance, ensuring the purity of the sampling. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the structure of the utility model.

[0019] In the figure, 1. sampling chamber; 2. sampling cylinder; 3. airtight door; 5. air inlet pipe; 6. sampling air inlet pipe; 7. sampling air inlet valve; 8. air inlet valve; 9. pressure gauge; 10. needle valve of the first cylinder; 11. main evacuation pipe; 12. needle valve of the second cylinder; 13. sampling tube; 14. first evacuation tube; 15. sampling valve; 16. sampler; 161. nitrogen trichloride sampling bottle; 162. conical sampling bottle; 17. first evacuation valve; 18. main evacuation valve; 19. vent pipe; 20. vent valve; 21. purge pipe; 22. purge valve; 23. second evacuation tube; 24. second evacuation valve; 25. bypass pipe; 26. bypass valve. DETAILED DESCRIPTION

[0020] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0021] Example 1

[0022] A chlorine gas sealed sampling device comprises a sampling chamber 1, a sampling port is provided on the sampling chamber 1, a sealed door 3 for opening or closing the sampling port is provided at the sampling port, a sampling steel cylinder 2 and a sampler 16 are provided in the sampling chamber 1, the sampling steel cylinder 2 is arranged in the sampling chamber 1, when sampling, the sampler 16 is first installed in the sampling chamber 1, and then the sealed door 3 is closed to keep the whole process of sampling sealed.

[0023] The upper end of the sampling steel cylinder 2 is connected to an air inlet pipe 5, and several sampling air inlet pipes 6 are connected in parallel on the air inlet pipe 5. The sampling air inlet pipe 6 is provided with a sampling air inlet valve 7. Different sampling air inlet pipes 6 are connected to different equipment and are used to collect chlorine in different equipment. The air inlet pipe 5 is provided with an air inlet valve 8, a pressure gauge 9 and a first steel cylinder needle valve 10 in sequence along the air flow direction. The lower end of the sampling steel cylinder 2 is connected to a sampling tube 13, and a second steel cylinder needle valve 12 is provided on the sampling tube 13. The gas outlet end of the sampling tube 13 is connected to a sampler 16, and a sampling valve 15 is provided on the sampling tube 13; the sampling tube 13 is connected to a first evacuation tube 14, and a first evacuation valve 17 is provided on the first evacuation tube 14. The gas outlet end of the first evacuation tube 14 is connected to an evacuation mechanism, and the evacuation mechanism is a vacuum pump. A gas detector is provided in the sampling chamber 1, and the gas detector is used to detect whether there is chlorine in the sampling chamber 1, and an alarm is issued after chlorine is detected. By providing the first evacuation pipe 14 and the evacuation mechanism, the chlorine in the pipeline can be discharged in time.

[0024] The evacuation mechanism is connected to the sampling chamber 1 through the second evacuation pipe 23, and a second evacuation valve 24 is provided on the second evacuation pipe 23. An evacuation main pipe 11 is connected to the evacuation mechanism, and an evacuation main valve 18 is provided on the evacuation main pipe 11. The first evacuation pipe 14 and the second evacuation pipe 23 are both connected to the evacuation main pipe 11.

[0025] When chlorine gas leaks into the sampling chamber 1, the evacuation mechanism and the second evacuation pipe 23 can evacuate and recover the chlorine gas in the sampling chamber 1 to avoid the risk of chlorine gas overflow and poisoning.

[0026] When there is a leak in the internal valve assembly of the sampling device, the gas detector gives an alarm. Opening the first evacuation valve 17 and the second evacuation valve 24 can evacuate the chlorine gas in the pipeline and the sampling chamber 1.

[0027] The sampler 16 includes a nitrogen trichloride sampling bottle 161 and a conical sampling bottle 162 that are sequentially connected to the sampling intake pipe 6. After the chlorine gas is first collected through the nitrogen trichloride sampling bottle 161, it is then sampled through the conical sampling bottle 162.

[0028] A vent pipe 19 is connected to the first evacuation pipe 14. The vent pipe 19 is located on the side of the first evacuation valve 17 close to the sampling pipe 13. A vent valve 20 is provided on the vent pipe 19, and the outlet end of the vent pipe 19 is connected to an alkali absorption pool.

[0029] The steps for closed sampling of chlorine gas are as follows:

[0030] (1) Protection: Sampling personnel operate while wearing gas masks.

[0031] (2) Preparation: Confirm that all valves except the first evacuation valve 17 and the second evacuation valve 24 are closed, the pressure gauge 9 is reset to zero, and the sampler 16 is installed.

[0032] (3) Before sampling, turn on the evacuation mechanism, the evacuation main valve 18, the first evacuation valve 17, and the second evacuation valve 24. Then turn on the evacuation mechanism for a period of time, and then close the first evacuation valve 17 to make the first evacuation pipe 14 in a slightly negative pressure state and the sampling chamber 1 in a negative pressure state. When the gas detector detects chlorine gas leakage in the sampling chamber, close the intake valve 8 and open the first evacuation valve 17, the second evacuation valve 24, and the evacuation main valve 18 to evacuate the negative pressure in the pipeline and the sampling chamber 1.

[0033] (4) Replacement: Open the intake valve 8, the sampling intake valve 7, the first cylinder needle valve 10, the second cylinder needle valve 12, and the vent valve 20 to replace the sample for 2 minutes.

[0034] (5) Sampling: Close the vent valve 20, open the sampling valve 15. After the pressure gauge 9 indicates stability, close the first cylinder needle valve 10, the second cylinder needle valve 12, the intake valve 8, and the sampling intake valve 7.

[0035] (6)Pressure relief: Open the vent valve 20, and after the pressure gauge 9 returns to zero, close the vent valve 20;

[0036] (7)Completion: Remove the sampler 16 to complete the sampling;

[0037] (8)After each operation is completed, the closed door 3 of the sampling chamber 1 must be closed to ensure the airtightness of the sampling process.

[0038] Embodiment 2

[0039] A purge pipe 21 is connected to the intake pipe 5. A purge valve 22 is provided on the purge pipe 21. The purge pipe 21 is located between the intake valve 8 and the first cylinder needle valve 10. The intake port of the purge pipe 21 is connected to a purge mechanism, and the purge mechanism is a blower; the intake pipe 5 and the outlet pipe 11 are connected and communicated through a bypass pipe 25, and a bypass valve 26 is provided on the bypass pipe 25.

[0040] After the end of step (5) of Embodiment 1, the purge valve 22, the bypass valve 26, and the vent valve 20 can be opened to purge the system for 5 minutes to discharge the residual chlorine in the system pipeline; when relieving pressure, close the purge valve 22, and after the pressure gauge 9 returns to zero, close the bypass valve 26 and the vent valve 20.

[0041] For the parts not covered above, the prior art applies.

[0042] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present invention. Those skilled in the technical field to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the direction of the present invention or exceed the scope defined by the appended claims. Those skilled in the art should understand that any modifications, equivalent substitutions, improvements, etc. made to the above embodiments based on the technical essence of the present invention should be included in the protection scope of the present invention.

Claims

1. A chlorine gas sealed sampling device, characterized in that: The invention comprises a sampling chamber (1), a sampling steel cylinder (2), a sampler (16) and an evacuation mechanism, wherein the sampling chamber (1) is provided with a sampling port, the sampling port is provided with a sealed door (3) for opening or closing the sampling port, the sampling steel cylinder (2) and the sampler (16) are located in the sampling chamber (1), the upper end of the sampling steel cylinder is connected with an air inlet pipe (5), the sampling steel cylinder (2) is connected to the sampler (16) through a sampling tube (13), the sampling tube (13) is provided with a sampling valve (15), the evacuation mechanism is connected to the sampling tube (13) through a first evacuation tube (14), the first evacuation tube (14) is provided with a first evacuation valve (17), the evacuation mechanism is connected to the sampling chamber (1) through a second evacuation tube (23), the second evacuation tube (23) is provided with a second evacuation valve (24).

2. A chlorine gas sealed sampling device according to claim 1, characterized in that: A plurality of sampling air intake pipes (6) are connected in parallel to the air intake pipe (5), and a sampling air intake valve (7) is provided on the sampling air intake pipe (6).

3. A chlorine gas sealed sampling device according to claim 1, characterized in that: The sampler (16) comprises a nitrogen trichloride sampling bottle (161) and a conical sampling bottle (162) which are sequentially connected to the sampling tube (13).

4. A chlorine gas sealed sampling device according to claim 1, characterized in that: The first evacuation pipe (14) is connected to a vent pipe (19), the vent pipe (19) is provided with a vent valve (20), and the gas outlet end of the vent pipe (19) is connected to an alkali absorption tank.

5. A chlorine gas sealed sampling device according to claim 4, characterized in that: The vent pipe (19) is located on a side of the first evacuation valve (17) close to the sampling pipe (13).

6. A chlorine gas sealed sampling device according to claim 1, characterized in that: The air inlet pipe (5) is connected to a purge pipe (21), a purge valve (22) is provided on the purge pipe (21), and the air inlet of the purge pipe (21) is connected to a purge mechanism.

7. A chlorine gas sealed sampling device according to claim 6, characterized in that: The air inlet pipe (5) is connected to the sampling pipe (13) via a bypass pipe (25), and a bypass valve (26) is provided on the bypass pipe (25).

8. A chlorine gas sealed sampling device according to claim 1, characterized in that: A first cylinder needle valve (10) is provided at one end of the air inlet pipe (5) close to the sampling cylinder (2), and a second cylinder needle valve (12) is provided at one end of the sampling pipe (13) close to the sampling cylinder (2).

9. A chlorine gas sealed sampling device according to claim 1, characterized in that: The evacuation mechanism is connected to a evacuation main pipe (11), the evacuation main pipe (11) is provided with a evacuation main valve (18), and the first evacuation pipe (14) and the second evacuation pipe (23) are both in communication with the evacuation main pipe (11).

10. A chlorine gas sealed sampling device according to claim 1, characterized in that: A gas detector is provided in the sampling chamber (1).

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