Nitrogen trichloride sampling device with closed box body

Abstract

The utility model discloses a nitrogen trichloride sampling device with a closed box body. The device comprises a liquid chlorine gasifier, a closed box body and an alkali liquor pool, the lower part of the liquid chlorine gasifier is connected with a sample outlet pipeline, and the pipeline is connected to an alkali liquor pool; a 90-degree turning structure is arranged on the sample outlet pipeline, a vertical pipeline is connected to the lower part of the turning structure, and the vertical pipeline is connected to the sample inlet of the closed box body; a purging gas inlet and a residual gas outlet are formed in the side surface of the closed box body; a sampling bottle is arranged in the closed box body. The sampling device can effectively avoid leakage of nitrogen trichloride, is high in safety coefficient, and can avoid the situation that sampling is difficult or sampling cannot be achieved in the sampling process in the prior art.

Description

Technical Field

[0001] The utility model belongs to the field of safe production, and in particular relates to a nitrogen trichloride sampling device with a sealed box. Background Art

[0002] Nitrogen trichloride, also known as trichloramine, is an inorganic compound with the chemical formula NCl3 and a molecular weight of 120.37. It is a yellow, oily, volatile toxic liquid with a pungent odor, a boiling point of 71°C, and is extremely unstable. Nitrogen trichloride is toxic and an explosive substance. It will decompose violently and explode when it comes into contact with many organic substances or is hit or rubbed.

[0003] Since nitrogen trichloride is an extremely unstable compound, it is very easy to decompose and release a lot of heat. If it accumulates to a certain concentration, it will explode violently when exposed to light, heat, vibration and other conditions. Therefore, a mechanism needs to be established during the production process to regularly discharge and analyze its content. If the operator fails to discharge the waste in a timely manner according to regulations and operates improperly, nitrogen trichloride explosions, large amounts of chlorine gas leaks and other hazards are likely to occur.

[0004] The Chlorine Safety Regulations (GB 11984-2008), the Guidelines for Safety Risk Investigation of Liquid Chlorine (Chlorine) Production Enterprises (Trial Implementation), and the Industrial Liquid Chlorine (GB / T 5138-2021) all have corresponding provisions for nitrogen trichloride sampling. Therefore, enterprises should pay attention to the discharge and sampling of nitrogen trichloride, establish relevant rules and regulations and operating procedures, and conduct regular training for operators to ensure that nitrogen trichloride is not enriched in the gasifier to avoid explosions caused by nitrogen trichloride. At present, the industry does not pay enough attention to the sampling of nitrogen trichloride. Due to the improvement of process technology, the content of nitrogen trichloride in the system is low, but it does not mean that there is no nitrogen trichloride, and the risk of nitrogen trichloride enrichment cannot be completely denied. In addition to daily regular discharge, attention should also be paid to the setting of nitrogen trichloride sampling points.

[0005] The prior art adopts Figure 5 In the case of structural sampling, if the structure is to obtain nitrogen trichloride, there must be enough residual liquid chlorine in the inner pipe to obtain the sample. However, in the actual situation, there is very little residual liquid chlorine in the production process. If this structure is used for sampling, due to the pressure in the system, the sample obtained is chlorine gas, not nitrogen trichloride. Nitrogen trichloride has been accumulating in the system, and it is easy to mistakenly believe that there is no nitrogen trichloride in the gasifier. The setting of the sampling point is unreasonable.

[0006] In order to obtain samples smoothly, in some cases, a pit is dug and the sampler is placed in it, so that the sample can be obtained smoothly. Although this improvement can obtain samples smoothly, it involves a certain amount of engineering work and is extremely inconvenient for sampling. Since the production site needs to be constructed, there are many problems. Utility Model Content

[0007] The utility model overcomes the defects of the prior art and provides a nitrogen trichloride sampling device with a sealed box. The sampling device can effectively prevent nitrogen trichloride leakage, has a high safety factor, and can avoid the situation in the prior art where it is difficult to sample or no sample can be obtained during the sampling process.

[0008] The technical solution of the utility model is as follows.

[0009] A nitrogen trichloride sampling device with a sealed box comprises a liquid chlorine gasifier, a sealed box and an alkaline liquid pool; a sampling pipeline is connected to the bottom of the liquid chlorine gasifier, and the pipeline is connected to the alkaline liquid pool; a 90° turning structure is arranged on the sampling pipeline, a vertical pipeline is connected to the bottom of the turning structure, and the vertical pipeline is connected to the sampling port of the sealed box; a purge gas inlet and a residual gas outlet are provided on the side of the sealed box; a sampling bottle is arranged inside the sealed box.

[0010] Furthermore, a sampling inlet valve is provided on the vertical pipeline.

[0011] Furthermore, an exhaust port, a recovery port and an injection port are also provided on the side of the closed box body where the purge gas inlet is provided; the exhaust port and the recovery port are both connected to the alkali liquid pool through pipes; and the residual gas outlet is connected to the chlorine absorption system through a pipe.

[0012] Furthermore, the recovery port in the closed box is connected to the top of the sampling bottle through a pipe; the pipe between the recovery port and the top of the sampling bottle and the pipe between the injection port and the bottom of the sampling bottle are also connected through a pipe, and an adjusting valve is provided on the pipe; the emptying port is connected to the top of the sampling bottle through a pipe.

[0013] Furthermore, the top and bottom pipes of the sampling bottle are connected to pipes, and the pipes are provided with threads; one end of the inlet pipe and the recovery pipe is fixedly connected to a spiral joint, and a hole with a threaded wall is provided inside the spiral joint, and the hole is connected to the pipe, and the threaded pipes connected to the top and bottom of the sampling bottle are connected to the spiral joint.

[0014] Furthermore, a pressure gauge is provided on the pipeline between the recovery port and the top of the sampling bottle.

[0015] Furthermore, a first sampling bottle valve and a second sampling bottle valve are respectively provided on the pipelines connected to the top and the bottom of the sampling bottle.

[0016] Furthermore, an inlet valve is provided on the inlet pipeline in the closed box.

[0017] Furthermore, a recovery port valve is provided on the recovery port pipe in the closed box; and an exhaust port valve is provided on the exhaust port pipe in the closed box.

[0018] Furthermore, the sealed box is provided with a sealed door.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] (1) In the device of the utility model, a 90° turning structure is provided on the sample outlet pipe, and a vertical pipe is connected below the turning structure, so that nitrogen trichloride is easily accumulated on the vertical pipe, thereby overcoming the defects of the prior art that it is difficult to take samples or it is impossible to take samples.

[0021] (2) In the present invention, the arrangement of the sampling closed box 2 improves the safety performance and effectively prevents the residual toxic gas inside the closed box from causing harm to the environment and the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the nitrogen trichloride sampling device with a closed box in the utility model;

[0023] Figure 2 It is a structural schematic diagram of a closed box;

[0024] Figure 3 It is a schematic diagram of the external structure of the closed box;

[0025] Figure 4 The diagram is a structural diagram of a spiral joint (the left picture is a physical picture, and the right picture is a cross-sectional view);

[0026] Figure 5 It is a schematic diagram of the sampling structure in the prior art.

[0027] The components in the figure are as follows: liquid chlorine vaporizer 1, closed box 2, closed door 2.1, residual gas outlet 2.2, alkali liquid pool 3, sampling inlet valve 4, sampling bottle 5, emptying port valve 6, recovery port valve 7, regulating valve 8, injection port valve 9, first sampling bottle valve 10, second sampling bottle valve 11, pressure gauge 12, screw joint 13. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] like Figure 1~Figure 3 As shown, a nitrogen trichloride sampling device with a closed box includes a liquid chlorine gasifier 1, a closed box 2 and an alkali liquid pool 3; in this embodiment, a nitrogen trichloride sewage outlet below the liquid chlorine gasifier 1 is connected to a sampling pipeline, and the pipeline is connected to the alkali liquid pool 3; a 90° turning structure is provided on the sampling pipeline, and a vertical pipeline is connected below the turning structure, and the vertical pipeline is connected to the sampling port of the closed box 2, and a sampling inlet valve 4 is provided on the vertical pipeline. The vertical pipeline is a key creative point of the utility model. Since nitrogen trichloride is liquid, it will gather at the turning point after leaving the liquid chlorine gasifier 1, that is, it will gather at the turning point. Figure 1 The vertical pipe on the sampling inlet valve 4 reaches the turning point.

[0031] In this embodiment, the alkali solution pool contains sodium hydroxide solution.

[0032] like Figure 2 and Figure 3 As shown, the closed box 2 in the utility model is described below; in the present embodiment, two opposite sides of the closed box 2 are provided with a purge gas inlet and a residual gas outlet 2.2, and the residual gas outlet 2.2 is connected to the external chlorine absorption system through a pipeline (the chlorine absorption system in the utility model refers to the chlorine absorption system in the prior art, and can be specifically referred to as a structure recorded in a chlorine absorption system in CN202211725759.7), and the purge gas inlet is passed through nitrogen to purge the nitrogen trichloride remaining in the closed box 2 during the sampling process, and after the purge, the nitrogen brings the nitrogen trichloride into the chlorine absorption system through the residual gas outlet 2.2. An emptying port, a recovery port and an injection port are also provided on the side of the closed box 2 where the purge gas inlet is provided, and the emptying port and the recovery port are both connected to the alkali liquid pool 3 through a pipeline, and the injection port is connected to the above-mentioned vertical pipeline.

[0033] like Figure 2 As shown, the injection port in the sealed box 2 is connected to the vertical pipe, and the recovery port is connected to the top of the sampling bottle 5 through a pipe. The specific connection relationship is: one end of the injection port pipe and the recovery port pipe are fixedly connected with a spiral joint 13. Figure 4 As shown, the spiral joint 13 has a threaded hole (such as Figure 4 As shown in the middle right figure, the dotted part is a hole with threads on the wall, and the threads are not drawn in the figure). The hole is connected to the pipeline, and the top and bottom of the sampling bottle 5 are connected to a threaded pipeline, which can be connected to the spiral joint 13, and the pipelines connected to the top and bottom of the sampling bottle 5 are respectively provided with a first sampling bottle valve 10 and a second sampling bottle valve 11. The pipeline between the recovery port and the spiral joint 13 connected to the top of the sampling bottle 5 and the pipeline between the injection port and the spiral joint 13 connected to the bottom of the sampling bottle 5 are also connected through a pipeline (the pipeline is also provided with a regulating valve 8); the emptying port is connected to the pipeline between the top of the sampling bottle 5 and the recovery port through a pipeline (the pipeline at the entrance of the emptying port is provided with an emptying port valve 6).

[0034] In this embodiment, a pressure gauge 12 for monitoring the system pressure is provided on the pipeline between the recovery port and the top of the sampling bottle 5 .

[0035] In this embodiment, an injection port valve 9 is provided on the injection port pipeline in the sealed box 2 .

[0036] In this embodiment, a recovery port valve 7 is provided on the recovery port pipeline in the closed box 2 .

[0037] like Figure 3 As mentioned above, in this embodiment, the sealed box body 2 is provided with a sealed door 2.1.

[0038] For the sampling inlet valve 4, the drain port valve 6, the recovery port valve 7, the regulating valve 8, the injection port valve 9, the first sampling bottle valve 10 and the second sampling bottle valve 11, the valves are kept closed when sampling is not performed.

[0039] When sampling is required, first introduce nitrogen to purge the inside of the sealed box 2 for 1 to 5 minutes to ensure that no toxic gas remains inside the sealed box 2, and then turn off the nitrogen. Open the sealed door 2.1, connect the pipes at the top and bottom of the sampling bottle 5 to the two spiral joints 13, then open the sampling inlet valve 4, the injection port valve 9, the first sampling bottle valve 10, the second sampling bottle valve 11, the emptying port valve 6 and the recovery port valve 7, and keep the regulating valve 8 closed. When the sampling bottle 5 is full of samples, open the regulating valve 8, close the first sampling bottle valve 10 and the second sampling bottle valve 11, and close the inlet valve 4, the emptying port valve 6, the recovery port valve 7, the regulating valve 8 and the injection port valve 9 after 1-5 minutes, and then take out the sampling bottle 5. Close the sealed door 2.1 again, introduce nitrogen to purge the inside of the sealed box 2 for 1 to 5 minutes to ensure that no toxic gas remains inside the sealed box 2, and then turn off the nitrogen to complete the sampling.

Claims

1. A nitrogen trichloride sampling device with a closed box, characterized in that: The invention comprises a liquid chlorine gasifier (1), a sealed box (2) and an alkali liquid pool (3); a sample outlet pipe is connected to the bottom of the liquid chlorine gasifier (1), and the pipe is connected to the alkali liquid pool (3); a 90° turning structure is arranged on the sample outlet pipe, a vertical pipe is connected to the bottom of the turning structure, and the vertical pipe is connected to the sample inlet of the sealed box (2); a purge gas inlet and a residual gas outlet (2.2) are provided on the side of the sealed box (2); and a sampling bottle (5) is arranged inside the sealed box (2).

2. A nitrogen trichloride sampling device with a closed box according to claim 1, characterized in that: The vertical pipeline is provided with a sampling inlet valve (4).

3. A nitrogen trichloride sampling device with a closed box according to claim 1, characterized in that: The side of the sealed box (2) on which the purge gas inlet is provided is also provided with an exhaust port, a recovery port and an injection port; the exhaust port and the recovery port are both connected to the alkali liquid pool (3) through pipelines; and the residual gas outlet (2.2) is connected to the chlorine absorption system through pipelines.

4. A nitrogen trichloride sampling device with a closed box according to claim 3, characterized in that: The recovery port in the sealed box (2) is connected to the top of the sampling bottle (5) through a pipeline; the pipeline between the recovery port and the top of the sampling bottle (5) and the pipeline between the injection port and the bottom of the sampling bottle (5) are also connected through a pipeline, and a regulating valve (8) is provided on the pipeline; the emptying port is connected to the top of the sampling bottle (5) through a pipeline.

5. A nitrogen trichloride sampling device with a closed box according to claim 4, characterized in that: The top and bottom pipes of the sampling bottle (5) are both connected to pipes, and the pipes are provided with threads; one end of the injection pipe and the recovery pipe is fixedly connected to a spiral joint (13), and a hole with a threaded wall is provided inside the spiral joint (13), and the hole is connected to the pipe, and the threaded pipes connected to the top and bottom of the sampling bottle (5) are connected to the spiral joint (13).

6. A nitrogen trichloride sampling device with a sealed box according to claim 3, characterized in that: A pressure gauge (12) is provided on the pipeline between the recovery port and the top of the sampling bottle (5).

7. A nitrogen trichloride sampling device with a sealed box according to claim 4, characterized in that: A first sampling bottle valve (10) and a second sampling bottle valve (11) are respectively arranged on the pipelines connecting the top and the bottom of the sampling bottle (5).

8. A nitrogen trichloride sampling device with a sealed box according to claim 4, characterized in that: An injection port valve (9) is provided on the injection port pipeline in the sealed box (2).

9. A nitrogen trichloride sampling device with a sealed box according to claim 4, characterized in that: A recovery port valve (7) is provided on the recovery port pipeline in the sealed box (2); and an exhaust port valve (6) is provided on the exhaust port pipeline in the sealed box (2).

10. The nitrogen trichloride sampling device with a sealed box according to claim 1, characterized in that: The sealed box (2) is provided with a sealed door (2.1).

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