A device for the pretreatment of a nitrogen tetroxide chlorine content assay

Abstract

The utility model belongs to liquid propellant analysis equipment technical field discloses a nitrogen tetroxide chlorine content test pretreatment device to solve the prior art problems, the device includes the test bench, is sequentially provided with nitrogen tetroxide treatment bottle, first absorption bottle, second absorption bottle on the test bench, the bottom of first absorption bottle and second absorption bottle is equipped with the delivery pipe, the nitrogen tetroxide treatment bottle, first absorption bottle and second absorption bottle all are equipped with the plug-in bottom pipe in, the plug-in bottom pipe is installed with the central gas tube, a plurality of spray pipes are installed on the plug-in bottom pipe, the bottom fixed mounting of plug-in bottom pipe is connected with the porous wave plate bubble ware of central gas tube, the utility model can be washed before pretreatment test, the central gas tube of plug-in bottom pipe is used as the gas path channel, and the bottom is provided with the porous wave plate bubble ware, and this design can make the gas dispersion into small bubbles, increase the contact area of gas and liquid in cavity, improve the reaction efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of liquid propellant analysis equipment, specifically to a pretreatment device for testing the content of dinitrogen tetroxide and chlorine. Background Technology

[0002] Nitrogen tetroxide, a conventional liquid propellant, is mainly used in space launches, such as missiles and launch vehicles. Excessive chloride content in liquid propellants can severely corrode propellant filling pipes. Therefore, determining the chloride content in nitrogen tetroxide is one of the important indicators for determining whether nitrogen tetroxide meets the requirements for high-purity liquid propellants, and chloride content determination is a mandatory test item in nitrogen tetroxide testing.

[0003] Impurities may be present in the experimental materials used for the pretreatment analysis of dinitrogen tetroxide samples. These impurities can interfere with the determination of chlorine content in dinitrogen tetroxide. Currently, manual cleaning of the experimental materials is quite difficult, and inadequate cleaning can affect the chlorine content determination results. In addition, the dinitrogen tetroxide pretreatment stage is currently performed manually, which is cumbersome, and operational errors can also affect the chlorine content determination results.

[0004] Therefore, there is an urgent need for a pretreatment device for testing the chlorine content of dinitrogen tetroxide to solve the above-mentioned problems. Utility Model Content

[0005] The purpose of this invention is to solve the problems of difficult cleaning, incomplete cleaning, and human error affecting the measurement results in the existing pretreatment analysis experimental device, and to provide a pretreatment device for the analysis of nitrogen tetroxide chlorine content.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A pretreatment device for testing the chlorine content of dinitrogen tetroxide includes a test bench. A dinitrogen tetroxide treatment bottle, a first absorption bottle, and a second absorption bottle are sequentially arranged on the test bench. Each of the first and second absorption bottles has a delivery pipe at its bottom. Each of the dinitrogen tetroxide treatment bottle, the first absorption bottle, and the second absorption bottle has a bottom insertion tube. A central gas pipe is installed inside the bottom insertion tube. Multiple spray pipes are installed on the bottom insertion tube. A porous corrugated plate bubbler connected to the central gas pipe is fixedly installed at the bottom of the bottom insertion tube. The central gas pipe located inside the dinitrogen tetroxide treatment bottle is connected to a nitrogen source. The top of the central gas pipe located inside the first absorption bottle is connected to the dinitrogen tetroxide treatment bottle. The top of the central gas pipe located inside the second absorption bottle is connected to the first absorption bottle.

[0008] Furthermore, each of the insertion tubes is connected to a chlorine-free distilled water pipeline and a compressed air pipeline.

[0009] Furthermore, the top of the central gas tube located inside the nitrogen tetroxide treatment bottle is connected to the nitrogen delivery mechanism via a connecting pipe, the top of the central gas tube located inside the first absorption bottle is connected to the upper part of the nitrogen tetroxide treatment bottle via a connecting pipe, and the top of the central gas tube located inside the second absorption bottle is connected to the upper part of the first absorption bottle via a connecting pipe.

[0010] Furthermore, a first solenoid valve is installed at the outlet end of the nitrogen source, and the first solenoid valve is connected to the connecting pipe. A second solenoid valve is installed on each chlorine-free distilled water pipeline, and a third solenoid valve is installed on each compressed air pipeline.

[0011] Furthermore, the bottom of the first absorption bottle is connected to a first delivery pipe, and the bottom of the second absorption bottle is connected to a second delivery pipe. A fourth solenoid valve is installed on both the first and second delivery pipes.

[0012] Furthermore, the first absorption bottle is equipped with a first liquid level sensor, and the second absorption bottle is equipped with a second liquid level sensor.

[0013] Furthermore, the bottom of the nitrogen tetroxide treatment bottle is connected to a discharge pipe, and a fifth solenoid valve is installed on the discharge pipe; the second absorption bottle is connected to a waste gas discharge pipe.

[0014] Furthermore, the top of the nitrogen tetroxide treatment bottle is fitted with a thick rubber stopper made of polytetrafluoroethylene.

[0015] Furthermore, the test bench is also equipped with a PLC control system, which is connected to the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve, the first liquid level sensor, and the second liquid level sensor.

[0016] Compared with the prior art, this utility model has the following advantages:

[0017] This invention allows for the cleaning of the nitrogen tetroxide treatment bottle, the first absorption bottle, and the second absorption bottle with chlorine-free distilled water via a bottom-insertion tube before pretreatment analysis. This removes impurities that may interfere with the analysis, reducing the residue of impurities and nitrogen tetroxide in the initial experiments. Subsequent air purging ensures the dryness and stability of the experimental apparatus, preventing moisture from affecting subsequent experiments.

[0018] The insertion tube of this invention adopts a two-layer design, with a central air tube serving as the air passage and a porous corrugated plate bubbler installed at the bottom. This design disperses the passing gas into tiny bubbles, increasing the contact area between the gas and the liquid in the cavity. A water spray pipe is installed on the outer layer of the insertion tube for preparing the absorbent liquid and rinsing the cavity.

[0019] This invention uses a PLC control system to control the on / off of nitrogen pipelines, chlorine-free distilled water pipelines, compressed air pipelines, as well as the first delivery pipe, second delivery pipe, and discharge pipe. It can automatically and accurately control the entire pretreatment process, including nitrogen supply, addition of chlorine-free distilled water, discharge of the absorbent liquid, and air purging, thus avoiding the influence of human error on the chlorine content determination results. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 .

[0021] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 .

[0022] Figure 3 This is a schematic diagram of the internal structure of the nitrogen tetroxide treatment bottle of this utility model.

[0023] Figure 4 This is a schematic diagram of the insertion tube structure of this utility model;

[0024] Figure 5 This is a schematic diagram of the first absorption bottle structure of this utility model.

[0025] The meanings of the reference numerals in the attached drawings are as follows: 1. Test bench; 2. Porous corrugated plate bubbler; 3. Nitrogen tetroxide treatment bottle; 4. Thick rubber stopper; 5. Nitrogen delivery mechanism; 6. First solenoid valve; 7. First absorption bottle; 8. Second absorption bottle; 9. Bottom insertion tube; 10. Fourth solenoid valve; 11. Second solenoid valve; 12. Third solenoid valve; 13. Support platform; 14. Beaker; 15. First delivery pipe; 16. Second delivery pipe; 17. Chlorine-free distilled water pipeline; 18. Compressed air pipeline; 19. Discharge pipe; 20. Fifth solenoid valve; 21. PLC control system; 22. First liquid level sensor; 23. Second liquid level sensor; 24. Waste gas discharge pipeline. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1-5 As shown, a pretreatment device for testing the chlorine content of dinitrogen tetroxide includes a test bench 1. A dinitrogen tetroxide treatment bottle 3, a first absorption bottle 7, and a second absorption bottle 8 are arranged sequentially on the test bench 1. The top of the dinitrogen tetroxide treatment bottle 3 is fitted with a thick rubber stopper 4, which is made of polytetrafluoroethylene. The bottom of the dinitrogen tetroxide treatment bottle 3 is connected to a discharge pipe 19.

[0028] Both the first absorption bottle 7 and the second absorption bottle 8 are equipped with a delivery pipe at the bottom (the bottom of the first absorption bottle 7 is connected to the first delivery pipe 15, and the bottom of the second absorption bottle 8 is connected to the second delivery pipe 16. The first delivery pipe 15 and the second delivery pipe 16 can be connected or are independent pipelines). The first absorption bottle 7 is equipped with a first liquid level sensor 22, and the second absorption bottle 8 is equipped with a second liquid level sensor 23. The nitrogen tetroxide treatment bottle 3, the first absorption bottle 7, and the second absorption bottle 8 are all equipped with a bottom insertion tube 9. A central air pipe 91 is installed inside the bottom insertion tube 9. Multiple spray pipes 92 are installed on the bottom insertion tube 9. The multiple spray pipes 92 can be tilted. A porous corrugated plate bubbler 2 connected to the central air pipe 91 is fixedly installed at the bottom of the bottom insertion tube 9. The porous corrugated plate bubbler 2 is a cubic plate with multiple small holes.

[0029] A central gas pipe 91 located inside the nitrogen tetroxide treatment bottle 3 is connected to a nitrogen source, which is a nitrogen delivery mechanism 5. The nitrogen delivery mechanism 5 includes a nitrogen generator and an air pump (this part is prior art). The nitrogen source is connected to a connecting pipe 93. The top of the central gas pipe 91 inside the nitrogen tetroxide treatment bottle 3 is connected to the nitrogen delivery mechanism 5 via a connecting pipe 93. The top of the central gas pipe 91 inside the first absorption bottle 7 is connected to the upper part of the nitrogen tetroxide treatment bottle 3 via a connecting pipe 93. The top of the central gas pipe 91 inside the second absorption bottle 8 is connected to the upper part of the first absorption bottle 7 via a connecting pipe 93. Each bottom pipe 9 is connected to a chlorine-free distilled water pipe 17 and a compressed air pipe 18. The chlorine-free distilled water pipe 17 is connected to a chlorine-free distilled water main pipe, and the compressed air pipe 18 is connected to a compressed air source main pipe.

[0030] In this embodiment, all pipelines are sealed together, and each pipeline is equipped with a valve. Flow meters, pressure sensors, etc., are installed as needed. The structural material of this invention has good chemical stability and can withstand the strong oxidizing and corrosive properties of nitrogen tetroxide.

[0031] A first solenoid valve 6 is installed at the outlet end of the nitrogen delivery mechanism 5. The first solenoid valve 6 is connected to the connecting pipe 93. A second solenoid valve 11 and a flow meter are installed on each chlorine-free distilled water pipeline 17. A third solenoid valve 12 is installed on each compressed air pipeline 18. A fourth solenoid valve 10 is installed on the first delivery pipe 15 and the second delivery pipe 16. A fifth solenoid valve 20 is installed on the discharge pipe 19.

[0032] As a further improvement, the test bench 1 is also equipped with a PLC control system 21 (Siemens series). The PLC control system 21 is connected to the first solenoid valve 6, the second solenoid valve 11, the third solenoid valve 12, the fourth solenoid valve 10, the fifth solenoid valve 20, the first liquid level sensor 22, and the second liquid level sensor 23. The PLC control system 21 is also connected to the solenoid valves and pressure valves on the chlorine-free distilled water main pipe and the compressed air main pipe. The PLC control system 21 is also connected to the electrical components of the nitrogen delivery mechanism 5, the compressed air source, and the chlorine-free distilled water source.

[0033] The work process is as follows:

[0034] Step 1: Rinse the chamber. Open the second solenoid valve 11 on the main chlorine-free distilled water pipe and each chlorine-free distilled water pipe 17. Chlorine-free distilled water is continuously sprayed into the nitrogen tetroxide treatment bottle 3, the first absorption bottle 7, and the second absorption bottle 8 through the spray pipe 92 in the bottom pipe 9, thoroughly rinsing the interior of the chamber. Open the fifth solenoid valve 20 on the discharge pipe 19, the fourth solenoid valve 10 on the first delivery pipe 15, and the second delivery pipe 16. Close the valves on other pipes.

[0035] The rinsing time is set to 2 minutes. Liquid generated during rinsing is drained and collected in a waste collection container. The rinsing procedure effectively removes residual impurities and reactants from the chamber, preparing it for the next experiment. Pressure can also be increased during the rinsing stage, depending on the actual situation.

[0036] Step 2: Purge. Afterwards, close the second solenoid valve 11 on the main chlorine-free distilled water line and each chlorine-free distilled water line 17, and open the solenoid valve on the main compressed air line and the third solenoid valve 12 on the compressed air line 18. Switch the pipeline to compressed air supply. Compressed air continuously purges the nitrogen tetroxide treatment bottle 3, the first absorption bottle 7, and the second absorption bottle 8 through the bottom insertion tube 9 for 5 minutes. The compressed air purge quickly dries any residual moisture in the chambers, preventing moisture from affecting subsequent experiments. Afterwards, close the solenoid valve on the main compressed air line and the third solenoid valve 12 on the compressed air line 18, and close the fifth solenoid valve 20 on the discharge pipe 19, and the fourth solenoid valve 10 on the first delivery pipe 15 and the second delivery pipe 16.

[0037] Step 3: Add the absorbent. Then, the second solenoid valve 11 on the chlorine-free distilled water main pipe and the chlorine-free distilled water pipeline 17 on the first absorption bottle 7 and the second absorption bottle 8 opens, while the solenoid valve on the chlorine-free distilled water pipeline 17 on the nitrogen tetroxide treatment bottle 3 closes. Start adding liquid to the first absorption bottle 7 and the second absorption bottle 8. When the first liquid level sensor 22 in the first absorption bottle 7 detects that the liquid level in the first absorption bottle 7 has reached the set level, the solenoid valve on the chlorine-free distilled water pipeline 17 on the first absorption bottle 7 closes. When the second liquid level sensor 23 in the second absorption bottle 8 detects that the liquid level in the second absorption bottle 8 has reached the set level, the solenoid valve on the chlorine-free distilled water pipeline 18 on the second absorption bottle 8 closes. Simultaneously, the solenoid valve on the chlorine-free distilled water main pipe closes.

[0038] Step 4: Add dinitrogen tetroxide. Inject the set amount of dinitrogen tetroxide (in milliliters) into the dinitrogen tetroxide treatment bottle 3 using a syringe.

[0039] Step 5: Nitrogen purging. After completing the liquid addition operation, the nitrogen source starts working. The first solenoid valve 6 at the outlet of the nitrogen source is opened, and the valve on the connecting pipe 93 is opened. The nitrogen first passes through the central gas tube 91 in the bottom tube of the nitrogen tetroxide bottle 3. After passing through the nitrogen tetroxide, it then goes to the central gas tube 91 in the first absorption bottle 7. Then the nitrogen continues to go to the central gas tube 91 in the second absorption bottle 8. The porous wave plate bubbler 2 disperses the gas into tiny bubbles, increasing the contact area between the gas and the liquid in the chamber. The entire nitrogen purging process lasts for 1 hour to ensure that the reaction is fully carried out. At the same time, the gas produced by the reaction is discharged to the waste gas treatment system through the waste gas discharge pipe 24.

[0040] Step 6: Absorbent liquid export. After nitrogen purging, the nitrogen source is turned off, the first solenoid valve 6 at the nitrogen source outlet is closed, and the fourth solenoid valves 10 on the first delivery pipe 15 and the second delivery pipe 16 are both opened. The absorbent liquid in the cavity is exported through the first delivery pipe 15 and the second delivery pipe 16 to the beaker 14 that has been placed on the support platform 13 for subsequent analysis.

[0041] Step 7, then repeat steps 1 and 2.

Claims

1. A pretreatment device for testing the chlorine content of nitrogen tetroxide, comprising a test bench (1), characterized in that: The test bench (1) is provided with a nitrogen tetroxide treatment bottle (3), a first absorption bottle (7), and a second absorption bottle (8) in sequence. The bottom of the first absorption bottle (7) and the second absorption bottle (8) are provided with a conveying pipe. The nitrogen tetroxide treatment bottle (3), the first absorption bottle (7), and the second absorption bottle (8) are provided with a bottom insertion tube (9). A central gas tube (91) is installed in the bottom insertion tube (9). Multiple spray pipes (92) are installed on the bottom insertion tube (9). A multi-hole corrugated plate bubbler (2) connected to the central gas tube (91) is fixedly installed at the bottom of the bottom insertion tube (9). The central gas tube (91) located in the nitrogen tetroxide treatment bottle (3) is connected to a nitrogen source. The top of the central gas tube (91) located in the first absorption bottle (7) is connected to the nitrogen tetroxide treatment bottle (3). The top of the central gas tube (91) located in the second absorption bottle (8) is connected to the first absorption bottle (7).

2. The pretreatment device for testing the chlorine content of nitrogen tetroxide according to claim 1, characterized in that: Each of the aforementioned insertion tubes (9) is connected to a chlorine-free distilled water line (17) and a compressed air line (18).

3. The pretreatment device for testing the chlorine content of nitrogen tetroxide according to claim 2, characterized in that: The top of the central gas tube (91) located in the nitrogen tetroxide treatment bottle (3) is connected to the nitrogen delivery mechanism (5) by a connecting pipe (93). The top of the central gas tube (91) located in the first absorption bottle (7) is connected to the upper part of the nitrogen tetroxide treatment bottle (3) by a connecting pipe (93). The top of the central gas tube (91) located in the second absorption bottle (8) is connected to the upper part of the first absorption bottle (7) by a connecting pipe (93).

4. The pretreatment device for testing the chlorine content of nitrogen tetroxide according to claim 1, characterized in that: The nitrogen source is equipped with a first solenoid valve (6) at the outlet end, which is connected to the connecting pipe (93). A second solenoid valve (11) is installed on each chlorine-free distilled water pipeline (17), and a third solenoid valve (12) is installed on each compressed air pipeline (18).

5. The pretreatment device for testing the chlorine content of nitrogen tetroxide according to claim 4, characterized in that: The bottom of the first absorption bottle (7) is connected to a first delivery pipe (15), and the bottom of the second absorption bottle (8) is connected to a second delivery pipe (16). A fourth solenoid valve (10) is installed on both the first delivery pipe (15) and the second delivery pipe (16).

6. The pretreatment device for testing the chlorine content of nitrogen tetroxide according to claim 5, characterized in that: The first absorption bottle (7) is equipped with a first liquid level sensor (22), and the second absorption bottle (8) is equipped with a second liquid level sensor (23).

7. The pretreatment device for testing the chlorine content of nitrogen tetroxide according to claim 6, characterized in that: The bottom of the nitrogen tetroxide treatment bottle (3) is connected to a discharge pipe (19), and a fifth solenoid valve (20) is provided on the discharge pipe (19); the second absorption bottle (8) is connected to a waste gas discharge pipe (24).

8. The pretreatment device for testing the chlorine content of nitrogen tetroxide according to claim 1, characterized in that: The top of the nitrogen tetroxide treatment bottle (3) is fitted with a thick rubber stopper (4), which is made of polytetrafluoroethylene.

9. The pretreatment device for testing the chlorine content of nitrogen tetroxide according to claim 7, characterized in that: The test bench (1) is also equipped with a PLC control system (21), which is connected to the first solenoid valve (6), the second solenoid valve (11), the third solenoid valve (12), the fourth solenoid valve (10), the fifth solenoid valve (20), the first liquid level sensor (22), and the second liquid level sensor (23).

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