Low-pollution sampling system, equipment and method for toxic propellants

Abstract

The invention discloses a low-pollution sampling system, equipment and method for toxic propellants. The low-pollution sampling system comprises a sampling bottle; a neutralization tank module; a first three-way joint; two ends of the blowback gas circuit are respectively connected with the first three-way joint and the gas cylinder; a first three-way connector, a valve V1, a valve K2, a first back-blowing branch, a second back-blowing branch and a gas cylinder are sequentially connected to the back-blowing gas circuit. Two ends of the sampling liquid path are respectively connected with the first three-way joint and the valve K7; a first three-way joint, a valve K1, a vacuum ejector ZK1, a valve K4 and a second three-way joint are sequentially connected onto the sampling liquid path; the other end of the first blowback branch is connected to the vacuum ejector ZK1; two ends of the neutralization pipeline are respectively connected with the valve K8 and the neutralization tank module; a third three-way joint, a valve K6, a vacuum ejector ZK2 and a valve K10 are sequentially connected onto the neutralization pipeline; the other end of the second blowback branch is communicated with the vacuum ejector ZK2; and the communicating pipeline is connected between the second three-way joint and the third three-way joint. And the harm of the propellant to personnel and the pollution of the propellant to the environment are greatly reduced.

Description

TECHNICAL FIELD

[0001] The application relates to a low-pollution sampling system, device and method for a toxic propellant, and belongs to the field of testing and storage of toxic and harmful liquids. BACKGROUND

[0002] Before filling, single-component and double-component propellants are subjected to propellant sampling testing. In the sampling process, in the past, workers generally wore protective clothing and extruded the propellant into a sampling bottle using the back pressure of a storage tank in an atmospheric environment. The sampling connecting pipeline cannot be completely closed into the sampling bottle, and even a small amount of steam of a propellant with a relatively high boiling point will volatilize into the atmosphere, and the volatilization of dinitrogen tetroxide is particularly serious. Secondly, in areas with relatively high humidity, the sampled propellant will absorb a small amount of water, resulting in errors in the test results of the propellant.

[0003] After searching, patent document CN210513793U discloses a full-closed sampling system for conventional liquid propellants, and relates to the field of testing and storage of toxic and harmful liquids. The system comprises a liquid storage tank, a sampling steel bottle and a waste liquid collection tank. The liquid storage tank is sealingly connected with the sampling steel bottle through a first liquid pipeline, and the sampling steel bottle is sealingly connected with the waste liquid collection tank through a second liquid pipeline. The upper end cover of the waste liquid collection tank is connected with a discharge pipe and a cleaning pipe. The cleaning pipe is connected with an inner pipe arranged in the tank cavity of the waste liquid collection tank, and the lower end of the inner pipe is located at the bottom of the tank cavity of the waste liquid collection tank. However, the patent only realizes sealing during the sampling process, and does not provide a pipeline purging and vacuumizing scheme. In actual use, a part of the propellant will still be leaked into the atmosphere around the operator, which has potential risks to the operator and pollutes the environment to a certain extent.

[0004] Patent document CN110448999B discloses an integrated device for propellant waste gas treatment, and discloses a system and method for using the integrated device for propellant waste gas treatment. The integrated device comprises a gas-liquid contact section, a static washing section and a supergravity process intensification section. The device is used for propellant waste gas treatment. The propellant waste gas enters the device through a fan for three-stage treatment. The treated gas is discharged through a gas outlet, and the liquid is circulated into a rotating packing rotor from the bottom of the device. The absorption liquid can be supplemented by a liquid supplement tank. The patent mainly focuses on the direction of propellant treatment, and the waste gas is also subjected to three absorption treatments. The device needs to be driven by electricity, and all electrical equipment needs to be executed according to the explosion-proof standard. The device is suitable for fixed equipment and is not suitable for mobile sampling.

[0005] Patent document CN103920385B discloses an oxidation absorption method for converting high-concentration dinitrogen tetroxide waste gas into potassium fertilizer. The dinitrogen tetroxide waste gas with a molar content of 20% to 70% is oxidized and absorbed by two-stage dilute nitric acid and hydrogen peroxide to form nitric acid, and then converted into potassium fertilizer by potassium hydroxide lye. The patent mainly focuses on the propellant treatment direction, and the waste gas is also treated by three absorption processes. SUMMARY

[0006] The technical problem solved by the present application is to overcome the shortcomings of the prior art and provide a low-pollution sampling system, equipment and method for toxic propellant, which takes samples in a closed system, neutralizes and absorbs volatile gas, and uses vacuum injection to take residual propellant in the connected pipeline to the neutralization tank for neutralization and absorption, thereby greatly reducing the harm of propellant to personnel and environmental pollution.

[0007] The technical scheme provided by the present application is as follows:

[0008] In a first aspect, a low-pollution sampling system for toxic propellant is provided for sampling from a propellant storage tank connected with a valve K102, comprising:

[0009] A sampling bottle is connected with a valve K7 and a valve K8.

[0010] A neutralization tank module contains a neutralization solution for neutralizing propellant.

[0011] A first tee joint has three connectors, one of which is used to connect the valve K102.

[0012] A back-blowing gas path is connected at one end to one connector of the first tee joint and at the other end to a gas cylinder. Between the first tee joint and the gas cylinder, the back-blowing gas path is sequentially connected with a valve V1, a valve K2, a first back-blowing branch and a second back-blowing branch.

[0013] A sampling liquid path is connected at one end to one connector of the first tee joint and at the other end to the valve K7. Between the first tee joint and the valve K7, the sampling liquid path is sequentially connected with a valve K1, a vacuum ejector ZK1, a valve K4 and a second tee joint. The other end of the first back-blowing branch is connected to the vacuum ejector ZK1, and the first back-blowing branch is provided with a valve K3.

[0014] A neutralization pipeline is connected at one end to the valve K8 and at the other end to the neutralization tank module. Between the valve K8 and the neutralization tank, the neutralization pipeline is sequentially connected with a third tee joint, a valve K6, a vacuum ejector ZK2 and a valve K10. The other end of the second back-blowing branch is connected to the vacuum ejector ZK2, and the second back-blowing branch is provided with a valve K9.

[0015] A communication pipeline is connected between the second three-way joint and the third three-way joint, and a valve K5 is arranged on the communication pipeline.

[0016] Further, a platform scale is arranged for placing the sampling bottle to weigh the sampling mass of the propellant.

[0017] Further, the valve V1 is arranged close to the first three-way joint, and the valve K2 is arranged close to the communication position of the first back blowing branch and the back blowing pipeline.

[0018] Further, the valve K1 is arranged close to the vacuum ejector ZK1.

[0019] Further, a pressure reducer J1 is further arranged on the back blowing pipeline, and pressure gauges are arranged on both sides of the pressure reducer J1; the pressure reducer J1 and the pressure gauges are arranged between the connection point of the second back blowing branch and the back blowing pipeline and the gas cylinder.

[0020] Further, a one-way valve D1 is further arranged on the back blowing pipeline, and the one-way valve D1 is arranged between the connection point of the second back blowing branch and the back blowing pipeline and the pressure reducer J1.

[0021] Further, the neutralization tank module is one neutralization tank, or the neutralization tank module comprises a plurality of neutralization tanks connected in series.

[0022] In the second aspect, a low-pollution sampling device for a toxic propellant is provided, which has the low-pollution sampling system for a toxic propellant described in any of the above aspects, and further comprises a shell.

[0023] The back blowing pipeline comprises a second back blowing pipeline and a first back blowing pipeline, and the sampling liquid pipeline comprises the first back blowing pipeline and a first sampling liquid pipeline.

[0024] The second back blowing pipeline is connected to one joint of the first three-way joint at one end, and is used for connecting the back blowing joint at the other end.

[0025] The second sampling liquid pipeline is connected to one joint of the first three-way joint at one end, and is used for connecting the sampling joint at the other end.

[0026] The first back blowing pipeline is connected with the back blowing joint at one end, and is connected with the gas cylinder at the other end; between the back blowing joint and the gas cylinder, the valve K2, the first back blowing branch, and the second back blowing branch are sequentially arranged on the first back blowing pipeline.

[0027] The first sampling liquid pipeline is connected with the sampling joint at one end, and is connected to the valve K7 at the other end; between the sampling joint and the valve K7, the valve K1, the vacuum ejector ZK1, the valve K4, and the second three-way joint are sequentially arranged on the first sampling liquid pipeline.

[0028] The shell, the platform scale, the neutralization tank module, the first back blowing pipeline, the first sampling liquid path, the neutralization pipeline, the first back blowing branch and the second back blowing branch are arranged in the shell;

[0029] The back blowing joint, the sampling joint, the valve V1, the valve K2, the valve K1, the valve K4, the valve K3, the valve K6, the valve K10, the valve K5 and the valve K9 are connected to the shell.

[0030] In a third aspect, a low-pollution sampling system for a toxic propellant is provided, comprising:

[0031] S1, the gas cylinder is confirmed to have gas, and the neutralization solution is configured in the neutralization tank; all valves are confirmed to be in a closed state;

[0032] S2, open the valve of the gas cylinder, open the valve K2, the valve K3, the valve V1 and the valve K1, after blowing for a set time, connect the joint valve K102 of the first three-way joint, and close the valve K1, the valve K2 and the valve V1;

[0033] S3, connect the valve K7 to the second three-way joint, and connect the valve K8 to the third three-way joint to complete the connection of the sampling bottle;

[0034] S4, open the valve K4, the valve K5, the valve K6 and the valve K10, and close the valve K3 after blowing for a set time;

[0035] S5, open the valve K1, slowly open the valve K102, and the propellant in the propellant storage tank flows into the neutralization tank module through the first three-way joint, the sampling liquid path, the communication pipeline and the neutralization pipeline under the back pressure in the tank, and then the valve K102 is closed;

[0036] S6, close the valve K5, open the valve K7, open the valve K102, then open the valve K8, and the propellant in the propellant storage tank flows into the sampling bottle through the first three-way joint and the sampling liquid path under the back pressure, and the gas in the sampling bottle flows into the neutralization tank through the valve K8 and the neutralization pipeline, realizing sampling; after sampling is completed, the valve K7, the valve K8 and the valve K102 are closed;

[0037] S7, increase the pressure of helium in the back blowing gas path, open the valve K2, the valve V1 and the valve K5, after helium is blown out from the gas cylinder, it is blown along the back blowing gas path to the first three-way joint, and then the propellant liquid in the sampling liquid path and the neutralization pipeline is blown into the neutralization tank for neutralization; the valve K2 is intermittently closed and opened during the process, and the cycle is repeated for multiple times; then the valve K2 and the valve V1 are closed;

[0038] S8. Open valve K9, and helium enters the vacuum ejector ZK2 through the first blowback branch and is blown into the neutralization tank through valve K10. The high-speed helium gas flow in the vacuum ejector ZK2 ejects the propellant from the sampling liquid line and the section between the third T-joint of the neutralization line and the vacuum ejector ZK2.

[0039] After the time is set in S9 and S8, valve K10 is closed and valve K3 is opened to start pressure charging. After pressure charging, valve K3 is closed.

[0040] After S10 and S9 are pressurized, they are left to stand for a set time, and then valve K10 is opened, and vacuum ejector ZK2 starts vacuum ejection. After the set time, valve K3 is opened, and vacuum ejectors ZK1 and ZK2 start ejection at the same time.

[0041] S11, repeat S9 and S10 multiple times;

[0042] S12. Close valves K3 and K4. With the vacuum ejector ZK2 in vacuum ejection mode, first remove the connection between the second three-way connector and valve K7, and install the valve plug of valve K7; then remove the connection between the third three-way connector and valve K8, install the valve plug of valve K8, and remove the sampling bottle;

[0043] S13, open valve K3 and valve K4, and vacuum ejectors ZK1 and ZK2 in vacuum ejection mode, remove the connection between the first three-way joint and valve K102, and then install the plug of the first three-way joint and the plug of valve K102;

[0044] S14. Close the gas cylinder valve and all valves.

[0045] In summary, this application has at least the following beneficial technical effects:

[0046] Sampling is performed within a closed system; vacuum extraction is performed using a vacuum ejector; and multiple neutralization tanks are used for multiple absorptions, improving absorption efficiency. The entire process is gas-driven, without the use of any electrical equipment, achieving vacuum and positive pressure replacement and purging.

[0047] The overall structure of the system is simple, and it is gas-driven throughout the process to achieve positive pressure purging and vacuum replacement; it eliminates the explosion-proof electrical parts, reduces weight, and its scope of use is no longer limited by power supply (explosion-proof requirements and outdoor use); it greatly reduces the possibility of propellant volatilization into the atmosphere, greatly protecting operators; and the corresponding equipment is easy to manufacture.

[0048] The system can also be used to remove propellant from product tanks containing a small amount of propellant and perform preliminary replacement and purge, such as removing the remaining propellant from recoverable satellites and performing preliminary replacement and purge, or removing propellant from aircraft emergency systems and performing preliminary replacement and purge. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A schematic diagram of a principle of a low-pollution sampling system for a toxic propellant in an embodiment of the present application;

[0050] Figure 2 A state schematic diagram of S2 in the embodiment;

[0051] Figure 3 A state schematic diagram of S3 in the embodiment;

[0052] Figure 4 A state schematic diagram of S4 in the embodiment;

[0053] Figure 5 A state schematic diagram of S5 in the embodiment;

[0054] Figure 6 A state schematic diagram of S6 in the embodiment;

[0055] Figure 7 A state schematic diagram of S7 in the embodiment;

[0056] Figure 8 A state schematic diagram of S8 in the embodiment;

[0057] Figure 9 A state schematic diagram of S9 in the embodiment;

[0058] Figure 10 A state schematic diagram of S10 in the embodiment;

[0059] Figure 11 A state schematic diagram of helium gas flow route when the sampling bottle is taken out in S12 in the embodiment;

[0060] Figure 12 A state schematic diagram after the sampling bottle is taken out in S12 in the embodiment;

[0061] Figure 13 A state schematic diagram of S13 in the embodiment;

[0062] Figure 14 A state schematic diagram of S14 in the embodiment.

[0063] BRIEF DESCRIPTION OF THE DRAWINGS: 1, propellant storage tank; 2, sampling bottle; 21, platform scale;

[0064] 31, first-stage neutralization tank; 32, second-stage neutralization tank; 33, third-stage neutralization tank;

[0065] 4, back-blowing gas path; 41, first three-way joint; valve V1; valve K2; one-way valve D1; pressure gauge P1; pressure reducer J1; pressure gauge P2; 48, gas cylinder;

[0066] 5, sampling liquid path; valve K1; pressure gauge P3; vacuum ejector ZK1; valve K4; 55, second tee joint; 56, communication pipeline; valve K5;

[0067] 6, neutralization pipeline; 61, third tee joint; valve K6; vacuum ejector ZK2; valve K10;

[0068] 7, first back blowing branch; valve K3;

[0069] 8, second back blowing branch; valve K9. DETAILED DESCRIPTION

[0070] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments disclosed by the present application will be further described in detail below with reference to the drawings.

[0071] The embodiments of the present application disclose a low-pollution sampling system for toxic propellant, which is used for sampling from a propellant storage tank 1. The propellant storage tank 1 is connected with a valve K102, as shown in the figure, and the sampling system comprises a sampling bottle 2, a platform scale 21, a neutralization tank, a back blowing gas path 4, a sampling liquid path 5, a communication pipeline 56, a neutralization pipeline 6, a first back blowing branch 7 and a second back blowing branch 8. Figure 1

[0072] The sampling bottle 2 is connected with a valve K7 and a valve K8. The sampling bottle 2 is placed on the platform scale 21, which is used for measuring the sampling mass of the propellant in the sampling bottle 2.

[0073] One end of the back blowing gas path 4 is connected to one joint of the first tee joint 41, and the other end is connected with a gas cylinder 48. Between the first tee joint 41 and the gas cylinder 48, the back blowing gas path 4 is sequentially connected with a valve V1, a valve K2, the first back blowing branch 7, the second back blowing branch 8, a check valve D1, a pressure gauge P1, a pressure reducer J1 and a pressure gauge P2. The valve V1 is next to the first tee joint 41, the valve K2 is close to the communication position of the first back blowing branch 7 and the back blowing gas path 4, the check valve D1 is used to avoid the backflow of propellant vapor to the gas cylinder 48, the pressure reducer J1 is used to reduce the pressure of the high-pressure helium gas flowing out of the gas cylinder 48, and the pressure gauge P2 is used to detect the pressure of the high-pressure helium gas flowing out of the gas cylinder 48 in the back blowing gas path 4, and the pressure gauge P1 is used to detect the pressure of the helium gas after being reduced by the pressure reducer J1 in the back blowing gas path 4.

[0074] One end of the sampling liquid path 5 is connected to one joint of the first tee joint 41, and the other end is connected to the valve K7. Between the first tee joint 41 and the valve K7, the sampling liquid path 5 is sequentially connected with a valve K1, a pressure gauge P3, a vacuum ejector ZK1, a valve K4 and a second tee joint 55. The valve K1 is next to the vacuum ejector ZK1, the other end of the first back blowing branch 7 is connected to the vacuum ejector ZK1, and the first back blowing branch 7 is provided with a valve K3.​

[0075] The third joint of the first three-way joint 41 is used for connecting the valve K102.

[0076] One end of the neutralization pipeline 6 is connected to the valve K8, and the other end is communicated to the neutralization tank. Between the valve K8 and the neutralization tank, the neutralization pipeline 6 is sequentially connected with the third three-way joint 61, the valve K6, the vacuum ejector ZK2 and the valve K10, the communication pipeline 56 is connected between the second three-way joint 55 and the third three-way joint 61, and the valve K5 is arranged on the communication pipeline 56. The other end of the second back blowing branch 8 is communicated to the vacuum ejector ZK2, and the valve K9 is arranged on the second back blowing branch 8.

[0077] The neutralization tank includes three, which are a first-stage neutralization tank 31, a second-stage neutralization tank 32 and a third-stage neutralization tank 33.

[0078] The neutralization tank contains saturated neutralization solution for neutralizing corresponding propellant, has a feeding port at the top, and has a plurality of stainless steel filter screens inside, the aperture of the stainless steel filter screens being 2-4 mm, so that the contact area is increased; and the use of three neutralization tanks can greatly absorb propellant;

[0079] The neutralization liquid is handed over to a professional toxic treatment unit for treatment after sampling is completed;

[0080] The pipeline from the valve K102 to the sampling system is a small-size pipeline with internal polishing, and the inner diameter is 4-6 mm;

[0081] The small-size spiral pipeline with internal polishing is used between the valve K4 and the valve K7 and between the valve K6 and the valve K8, so that the connection flexibility is increased and the propellant adhered to the inner surface of the pipeline is as little as possible;

[0082] The amount of propellant released in the sampling process is relatively small compared with the engine test, propellant transfer and propellant filling process. In the case that the tail gas emission meets the standard, the amount of gas source and the neutralization solution prepared at a time meet the requirement of not less than 15 sampling tasks under the conditions of gas driving and triple absorption.

[0083] Currently, the propellant of the single-unit propelling satellite is mainly anhydrous hydrazine, and the propellant of the double-unit propelling satellite is methyl hydrazine and dinitrogen tetroxide (containing 1% NO, which is green).

[0084] The low-pollution sampling equipment for toxic propellant includes a shell, a first three-way joint 41, a second back blowing pipeline and a second sampling liquid pipeline. The second back blowing pipeline and the second sampling liquid pipeline are both hoses, one end of the second back blowing pipeline is connected to one joint of the first three-way joint 41, one end of the second sampling liquid pipeline is connected to one joint of the first three-way joint 41, and the third joint of the first three-way joint 41 is used for connecting the valve K102.

[0085] The shell is provided with a platform scale 21, a neutralizing tank, a first back blowing pipe, a first sampling liquid pipe, a neutralizing pipe, a first back blowing branch 7 and a second back blowing branch 8.

[0086] The platform scale 21 is used for placing the sampling bottle 2 and weighing the sampling mass of the propellant in the sampling bottle 2.

[0087] One end of the first back blowing pipe is connected with a back blowing joint, and the other end is connected with a gas cylinder 48; between the back blowing joint and the gas cylinder 48, the first back blowing pipe is sequentially connected with a valve K2, the first back blowing branch 7, the second back blowing branch 8, a one-way valve D1, a pressure gauge P1, a pressure reducer J1 and a pressure gauge P2.

[0088] One end of the first sampling liquid pipe is connected with a sampling joint, and the other end is connected with a valve K7; between the sampling joint and the valve K7, the first sampling liquid pipe is sequentially connected with a valve K1, a pressure gauge P3, a vacuum ejector ZK1, a valve K4 and a second three-way joint 55.

[0089] The other end of the second back blowing pipe is used for connecting the back blowing joint, and the other end of the second sampling liquid pipe is used for connecting the sampling joint. After the second back blowing pipe is connected with the back blowing joint, the second back blowing pipe and the first back blowing pipe form a back blowing gas pipe 4; after the second sampling liquid pipe is connected with the sampling joint, the second sampling liquid pipe and the first sampling liquid pipe form a sampling liquid pipe 5.

[0090] One end of the neutralizing pipe 6 is connected with a valve K8, and the other end is communicated with the neutralizing tank; between the valve K8 and the neutralizing tank, the neutralizing pipe 6 is sequentially connected with a third three-way joint 61, a valve K6, a vacuum ejector ZK2 and a valve K10, a communication pipe 56 is connected between the second three-way joint 55 and the third three-way joint 61, and the communication pipe 56 is provided with a valve K5. The other end of the second back blowing branch 8 is communicated with the vacuum ejector ZK2, and the second back blowing branch 8 is provided with a valve K9.

[0091] The back blowing joint, the sampling joint, the valve V1, the valve K2, the one-way valve D1, the pressure gauge P1, the pressure reducer J1, the pressure gauge P2, the valve V1, the valve K1, the pressure gauge P3, the valve K4, the valve K3, the valve K9, the valve K5, the valve K6 and the valve K10 are integrated on the shell.

[0092] A door which can be opened and closed is arranged on the shell, so as to facilitate placing and taking away the sampling bottle 2 on the platform scale 21, and facilitate connecting the sampling bottle 2 with the first sampling liquid pipe and the neutralizing liquid pipe 6.

[0093] Through the above arrangement, the sampling device which is convenient to move and use is formed, and the sampling convenience is improved.

[0094] A low-pollution sampling method for toxic propellant, comprising the following steps:

[0095] 1) Preparation. Confirm that the gas cylinder 48 has gas, and the neutralization tank is configured with a neutralization solution for neutralizing residual propellant; initially, all valves are closed;

[0096] 2) Pipeline connection. Clean the joints of the first three-way joint 41, the back flushing joint, and the sampling joint, connect the second back flushing pipeline to the back flushing joint, connect the second sampling liquid pipeline to the sampling joint, open the valve of the gas cylinder 48, adjust the pressure reducer J1 to 0.2 MPa, open the valves K2, K3, V1, and K1; the helium gas blown out of the gas cylinder 48 is blown out of the first three-way joint 41 through the valve K2 on the back flushing gas pipeline 4, and the helium gas blown out of the gas cylinder 48 is sequentially blown out of the first three-way joint 41 through the valve K3, the vacuum ejector ZK1, the valve K1, thereby realizing the purging of the back flushing gas pipeline 4, the first back flushing branch 7, and the part of the sampling liquid pipeline 5 between the vacuum ejector ZK1 and the first three-way joint 41; after three minutes, adjust the pressure reducer J1 to 0.03 MPa-0.05 MPa, connect the joint of the first three-way joint 41 to the valve K102, and close the valves K1 and K2; this process is connected in positive pressure to prevent atmospheric impurities from entering the first three-way joint 41; the sampling liquid pipeline 5 is preferably a transparent fluorine tube; as shown in Figure 2 ;

[0097] 3) Connection of the sampling bottle 2. Connect the valve K7 to the second three-way joint 55, and connect the valve K8 to the third three-way joint 61, thereby completing the connection of the sampling bottle 2; as shown in Figure 3 .

[0098] 4) Purging of the sampling system pipeline. Adjust the pressure reducer J1 to 0.2 MPa, open the valves K4, K5, K6, and K10, helium gas is blown out of the gas cylinder 48, sequentially passes through the valve K3, the vacuum ejector ZK1, the valve K4, the valve K5, the valve K6, the vacuum ejector ZK2, and the valve K10, and finally enters the neutralization tank; thereby realizing the purging of the part of the back flushing gas pipeline 4, the first back flushing branch 7, the part of the sampling liquid pipeline 5, the first back flushing branch 7, and the neutralization pipeline 6, and closing the valve K3 after three minutes; as shown in Figure 4 .

[0099] 5) Pipeline liquid filling. Open the valve K1, slowly open the valve K102, and the propellant in the propellant storage tank 1 flows into the neutralization tank through the first three-way joint 41, the sampling liquid pipeline 5, the communication pipeline 56, and the neutralization pipeline 6 under the back pressure in the tank, and continues for about 1 minute to ensure that the propellant fills the sampling liquid pipeline 5 and the neutralization pipeline 6 and enters the neutralization tank, and then the valve K102 is closed; this process washes the sampling liquid pipeline 5 and the neutralization pipeline 6 once, and the later sampling is cleaner and the detection result is more accurate; as shown in Figure 5shown.

[0100] 6) Sampling. Close valve K5, open valve K7, then slowly open valve K102, then open valve K8; at this time, the propellant in propellant tank 1 under back pressure enters sampling bottle 2 through first tee joint 41 and sampling liquid line 5, and the gas in sampling bottle 2 enters neutralization tank through valve K8 and neutralization line 6, realizing sampling; after sampling is completed, close valve K7, valve K8 and valve K102, (the sampling weight is given by mechanical scale 21, generally 2-3 Kg, the satellite methyl hydrazine / anhydrous hydrazine tank is stored at a back pressure of 0.05±0.01 MPa, and dinitrogen tetroxide is 0.17±0.01 MPa). Figure 6 shown.

[0101] 7) Sampling line purging. Adjust the pressure reducer to 0.3 MPa, open valve K2 and valve V1, and open valve K5; after helium is blown out from gas cylinder 48, it is blown along back blowing line 4 to first tee joint 41, and then the propellant liquid in sampling liquid line 5 and neutralization line 6 is blown into the neutralization tank for neutralization. Close valve K2 after 2 minutes, then open valve K2 again after 1 minute, and repeat 5 times, then close valve K2 and valve V1. Multiple purging blows the propellant in the pressure gauge, valve, joint and other blind cavity positions in sampling line 5 and propellant vapor into the neutralization tank as much as possible. Figure 7 shown.

[0102] 8) Vacuum ejector ZK2 vacuum injection. Open valve K9, helium enters vacuum ejector ZK2 through second back blowing branch 8, and is blown into the neutralization tank through valve K10; the high-speed helium gas flow in vacuum ejector ZK2 injects the propellant in the part between sampling liquid line 5 and third tee joint 61 of neutralization line 6 to vacuum ejector ZK2; the use of vacuum ejector ZK2 for vacuum injection realizes vacuumizing the part between sampling liquid line 5 and third tee joint 61 of neutralization line 6 to vacuum ejector ZK2, and under the action of the gas flow, the propellant residual in the pipeline between valve K102 and vacuum ejector ZK2 is brought into the neutralization tank. The propellant in the pipeline between valve K9 and vacuum ejector ZK2, and vacuum ejector ZK2 and valve K10 is brought into the neutralization tank by the positive pressure gas flow; as Figure 8 shown.

[0103] 9) Pressurization. After 2 min, close valves K9 and K10, and open valve K3; since valve K10 is closed, vacuum ejectors ZK1 and ZK2 have no vacuum ejecting function at this time, and the interiors of vacuum ejectors ZK1 and ZK2 are in a communication structure, which only has a communication function at this time. Helium is pressurized from back-blowing gas path 4 through first back-blowing branch 7 into the portion of sampling liquid path 5 and third three-way joint 61 of neutralization path 6 between vacuum ejector ZK2, and after pressurization, valve K3 is closed.

[0104] This process mixes helium with the remaining small amount of propellant vapor in sampling liquid path 5 and neutralization path 6, increases the total gas amount in sampling liquid path 5 and neutralization path 6, and reduces the concentration of propellant vapor, so that in the next vacuum ejecting process of vacuum ejector ZK2, more propellant vapor can be ejected and flow into the neutralization tank; as shown in Figure 9 .

[0105] 10) Secondary vacuum ejecting. After 3 min of standing, open valves K10 and K9, and vacuum ejector ZK2 performs vacuum ejecting to vacuumize sampling liquid path 5 and the portion of neutralization path 6 connected to vacuum ejector ZK2 from third three-way joint 61, and after 2 min, open valve K3, and vacuum ejectors ZK1 and ZK2 simultaneously perform ejecting, which is 2-stage vacuumizing; as shown in Figure 10 .

[0106] 11) Repeat 9) and 10) 3-5 times;

[0107] 12) Remove sampling bottle. Close valves K3 and K4, vacuum ejector ZK2 is in vacuum ejecting mode, remove sampling bottle 2, first remove the connection of second three-way joint 55 and valve K7, then block the connection point of valve K7 with a plug, and install the valve plug of valve K7 at the same time; then remove the connection of third three-way joint 61 and valve K8, block the connection point of valve K8 with a plug, and install the valve plug of valve K8 at the same time, and remove sampling bottle 2. As shown in Figure 11 and Figure 12 .

[0108] In this process, since vacuum ejector ZK2 is in vacuum ejecting mode, when second three-way joint 55 and third three-way joint 61 are removed, atmospheric gas is ejected into first back-blowing branch 7 and neutralization path 6 from the openings of second three-way joint 55 and third three-way joint 61, which avoids the residual propellant vapor in first back-blowing branch 7 and neutralization path 6 from entering the atmosphere, and directly avoids damage to the human body.

[0109] 13) disconnect the sampling line. Open valve K3 and valve K4, vacuum ejector ZK1 and vacuum ejector ZK2 are in vacuum ejector mode, remove the first tee joint 41 and valve K102 connection, then install the valve K102 plug of the first tee joint 41 plug.

[0110] In this process, because the vacuum ejector ZK1 and vacuum ejector ZK2 are in vacuum ejector mode, after the first tee joint 41 is removed, atmospheric gas is ejected into the sampling liquid line 5 from the street where the first tee joint 41 is removed, avoiding the residual propellant vapor in the sampling liquid line 5 from entering the atmosphere, directly avoiding the damage to the human body. As shown in Figure 13

[0111] 14) close the cylinder 48 valve, system pressure relief, close all valves, sampling is completed. As shown in Figure 14

[0112] The content not described in detail in the specification of the present application is the known technology of those skilled in the art.

[0113] The present application is described in detail above in combination with specific embodiments and exemplary examples, but these descriptions cannot be understood as limiting the present application. Those skilled in the art understand that the technical solutions and their embodiments of the present application can be variously replaced, modified or improved without departing from the spirit and scope of the present application, and these all fall within the scope of the present application. The protection scope of the present application is subject to the appended claims.​​

Claims

1. A low-pollution sampling system for toxic propellants, used for sampling from a propellant storage tank (1), the propellant storage tank (1) is connected to a valve K102, characterized in that: include: A sampling bottle (2) is connected to valves K7 and K8; a neutralization tank module containing a neutralization solution for neutralizing the propellant; A first three-way connector (41) has three connectors, one of which is used to connect to the valve K102; The blowback gas circuit (4) has one end connected to a joint of the first three-way joint (41) and the other end connected to the gas cylinder (48); between the first three-way joint (41) and the gas cylinder (48), the blowback gas circuit (4) is connected in sequence to a valve V1, a valve K2, a first blowback branch (7), and a second blowback branch (8); The sampling liquid path (5) has one end connected to a joint of the first three-way joint (41) and the other end connected to a joint of the second three-way joint (55). The second three-way joint (55) is used to connect to the valve K7. Between the first three-way joint (41) and the second three-way joint (55), the sampling liquid path (5) is sequentially connected to the valve K1, the vacuum ejector ZK1, and the valve K4. The other end of the first blowback branch (7) is connected to the vacuum ejector ZK1. The first blowback branch (7) is provided with a valve K3. The neutralization pipeline (6) has one end connected to a joint of the third three-way joint (61) and the other end connected to the neutralization tank module; the third three-way joint (61) is used to connect to the valve K8, and between the third three-way joint (61) and the neutralization tank, the neutralization pipeline (6) is sequentially connected to the valve K6, the vacuum ejector ZK2 and the valve K10; the other end of the second blowback branch (8) is connected to the vacuum ejector ZK2, and the second blowback branch (8) is provided with a valve K9; The communication pipeline (56) is connected between the second three-way connector (55) and the third three-way connector (61), and a valve K5 is provided on the communication pipeline (56).

2. A low-pollution sampling system for toxic propellants according to claim 1, characterized in that: The utility model also comprises a platform scale (21), which is used for placing the sampling bottle (2) to weigh the mass of the propellant sample in the sampling bottle (2).

3. The low-pollution sampling system for toxic propellants according to claim 1, characterized in that: The valve V1 is adjacent to the first three-way connector (41), and the valve K2 is close to the connection position between the first blowback branch (7) and the blowback air path (4).

4. The low-pollution sampling system for toxic propellants according to claim 1, characterized in that: The valve K1 is located in close proximity to the vacuum ejector ZK1.

5. The low-pollution sampling system for toxic propellants according to claim 1, characterized in that: The blowback gas line (4) is also connected to a pressure reducer J1, and the blowback gas line (4) is connected to pressure gauges on both sides of the pressure reducer J1; the pressure reducer J1 and the pressure gauge are both located between the connection point between the second blowback branch (8) and the blowback gas line (4) and the gas cylinder (48).

6. The low-pollution sampling system for toxic propellants according to claim 1, characterized in that: The blowback air path (4) is also connected to a one-way valve D1, which is located between the connection point between the second blowback branch (8) and the blowback air path (4) and the pressure reducer J1.

7. The low-pollution sampling system for toxic propellants according to claim 1, characterized in that: The neutralization tank module is one neutralization tank, or the neutralization tank module includes a plurality of neutralization tanks connected in series.

8. A low-pollution sampling device for toxic propellants, characterized in that: A low-pollution sampling system for toxic propellants according to any one of claims 1 to 7, further comprising a housing; The back-blowing gas circuit (4) includes a second back-blowing pipeline and a first back-blowing pipeline, and the sampling liquid circuit (5) includes a first back-blowing pipeline and a first sampling liquid circuit; A second blowback pipeline, one end of which is connected to a joint of the first three-way joint (41), and the other end of which is used to connect to the blowback joint; A second sampling liquid path, one end of which is connected to a joint of the first three-way joint (41), and the other end of which is used to connect to a sampling joint; The first back-blowing pipeline has a back-blowing connector at one end and a gas cylinder (48) at the other end; between the back-blowing connector and the gas cylinder (48), the first back-blowing pipeline is sequentially connected with a valve K2, a first back-blowing branch (7), and a second back-blowing branch (8); A first sampling liquid path, one end of which is connected to a sampling connector and the other end is connected to a valve K7; between the sampling connector and the valve K7, the first sampling liquid path is sequentially connected to a valve K1, a vacuum ejector ZK1, a valve K4 and a second three-way connector (55); The housing, the platform scale (21), the neutralization tank module, the first back-blowing pipeline, the first sampling liquid pipeline, the neutralization pipeline, the first back-blowing branch (7) and the second back-blowing branch (8) are all arranged in the housing; The back-blowing connector, the sampling connector, the valve V1, the valve K2, the valve K1, the valve K4, the valve K3, the valve K6, the valve K10, the valve K5 and the valve K9 are all connected to the housing.

9. A low-pollution sampling system for toxic propellants according to any one of claims 1 to 7, characterized in that: include: S1. Confirm that there is gas in the gas cylinder (48) and prepare the neutralization solution in the neutralization tank; Confirm that all valves are in the closed state; S2. Open the valve of the gas cylinder (48), open valve K2, valve K3, valve V1 and valve K1, and after the set purge time, connect the joint of the first three-way joint (41) to valve K102, and close valve K1, valve K2 and valve V1; S3, connect valve K7 to the second three-way connector (55), and connect valve K8 to the third three-way connector (61), completing the connection of the sampling bottle (2); S4, open valves K4, K5, K6 and K10, and close valve K3 after the purge time is set; S5. Open valve K1 and slowly open valve K102. The propellant in the propellant storage tank (1) flows into the neutralization tank module through the first three-way connector (41), the sampling liquid line (5), the connecting line (56) and the neutralization line (6) under the back pressure in the tank. Then, close valve K102. S6, close valve K5, open valve K7, open valve K102, and then open valve K8. The propellant in the propellant storage tank (1) enters the sampling bottle (2) through the first three-way connector (41) and the sampling liquid path (5) under back pressure. At the same time, the gas in the sampling bottle (2) enters the neutralization tank through valve K8 and the neutralization pipeline (6), thereby achieving sampling. After the sampling is completed, close valves K7, K8, and K102. S7, increasing the pressure of the helium in the blowback gas line (4), opening valves K2, V1, and K5, blowing the helium out of the gas cylinder (48), and then blowing it along the blowback gas line (4) to the first three-way connector (41), and then blowing the propellant liquid in the sampling liquid line (5) and the neutralization line (6) into the neutralization tank for neutralization; During this process, valve K2 is closed and opened intermittently for several cycles; then valve K2 and valve V1 are closed; S8, open valve K9, helium enters vacuum ejector ZK2 through the first blowback branch (7), and is blown into the neutralization tank through valve K10; the high-speed helium gas flow in vacuum ejector ZK2 ejects the propellant in the portion between the sampling liquid line (5) and the third three-way connector (61) of the neutralization line (6) and vacuum ejector ZK2; After S9 and S8 set the time, close valves K9 and K10, open valve K3, and start pressure charging. After pressure charging, close valve K3. After S10 and S9 are pressurized, they are left to stand for a set time. Then valves K10 and K9 are opened, and vacuum ejector ZK2 starts vacuum ejection. After the set time, valve K3 is opened, and vacuum ejectors ZK1 and ZK2 start ejection at the same time. S11, repeat S9 and S10 multiple times; S12, close valve K3 and valve K4, and put the vacuum ejector ZK2 in vacuum ejection mode. First, remove the connection between the second three-way connector (55) and valve K7, and install the valve plug of valve K7; then remove the connection between the third three-way connector (61) and valve K8, install the valve plug of valve K8, and remove the sampling bottle (2); S13, open valve K3 and valve K4, vacuum ejector ZK1 and vacuum ejector ZK2 in vacuum ejection mode, remove the connection between the first three-way joint (41) and valve K102, and then install the plug of the first three-way joint (41) and the plug of valve K102; S14. Close the valve of the gas cylinder (48) and all valves.

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