Liquid propellant collecting and processing method and device

Abstract

The invention discloses a liquid propellant collecting and processing method and device, and the collecting device mainly comprises a manual stop valve, a hose, a cavity container, a hand valve and a vacuum pressure gauge, and further comprises a sodium bicarbonate or sodium persulfate filter and an integrated pipeline. Rocket liquid propellants generally have high volatility and high toxicity, and after propellants of liquid attitude control systems of rockets or missiles and the like are filled, part of propellant residues in filling liquid pipelines and service valves cannot be removed through gas blowing. The collecting device is suitable for collecting the propellant remaining in the liquid propellant filling pipeline or the service valve, later treatment is facilitated, the collecting and treating method is simple, reliable and practical, the problem that the propellant pollutes the environment when the filling pipeline or the service valve is dismantled can be effectively solved, and meanwhile the body health of an operator can be effectively protected.

Description

Technical Field

[0001] The present invention relates to a method and device for collecting and treating liquid propellant, which are mainly used for collecting and treating volatile and highly toxic residual liquid propellant in the fields of aerospace, environmental protection, etc. Background Art

[0002] Rocket liquid propellants are generally highly volatile and toxic. After the propellant of the liquid attitude control system of a rocket or missile is filled, liquid propellant remains in the pipeline, which is generally blown out by nitrogen and blown into a neutralizing liquid tank. However, due to the structural influence of some filling pipelines and service valves, the propellant residue cannot be removed by gas blowing. When removing this part of the filling pipeline and service valve, it is generally sealed by installing a plug and transported to a special cleaning site for cleaning; however, during removal and sealing, the liquid propellant will evaporate or overflow quickly, causing environmental pollution. If inhaled into the operator's body, it will affect the health of the operator and pose a major safety hazard. Summary of the invention

[0003] The present invention aims to provide a method and device for collecting and processing liquid propellant, so as to solve the problem that some liquid propellant filling pipelines and service valves are affected by the structure and the residual propellant cannot be blown away / removed by gas. The method and device are used to collect the residual liquid propellant in these filling pipelines and service valves to facilitate subsequent processing. The collection and processing method and the collection device must meet the requirements of simplicity, reliability and practicality, and can effectively solve the problem of propellant polluting the environment during the dismantling of the liquid propellant filling pipelines and service valves, while effectively protecting the health of the operator.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A liquid propellant collecting device, comprising:

[0006] A manual stop valve, the inlet end of which is connected to the adapter;

[0007] A hose, an inlet end of the hose is connected to an outlet end of the manual stop valve;

[0008] A hollow container, wherein the inlet end of the hollow container is connected to the outlet end of the hose, and the inner cavity of the hollow container forms a liquid collection and temporary storage space;

[0009] A hand valve, the inlet end of the hand valve is connected to the outlet end of the cavity container;

[0010] A vacuum pressure gauge is connected to the outlet end of the hand valve.

[0011] Furthermore, the materials of the manual stop valve, the hose, the cavity container and the hand valve meet primary compatibility with the liquid propellant.

[0012] Furthermore, the manual stop valve, the hose, the cavity container and the hand valve are made of stainless steel.

[0013] Furthermore, the cavity container is a complete cavity sphere formed by welding two hemispherical shells.

[0014] Furthermore, the volume of the cavity container is more than times the volume of the liquid propellant filling pipeline cavity or the service valve cavity.

[0015] Furthermore, the liquid propellant collection device also includes an integrated pipeline and a stop valve. The integrated pipeline is provided with a plurality of interconnected connecting nozzles, each connecting nozzle corresponds to the inlet end of a cavity container, the inlet end of the integrated pipeline is connected to the outlet end of the stop valve, and the inlet end of the stop valve is connected to a joint.

[0016] Furthermore, the liquid propellant collecting device also includes a sodium bicarbonate or sodium persulfate filter, which is arranged between the connecting nozzle and the inlet end of the cavity container, or between the outlet of the stop valve and the inlet of the integrated pipeline, or simultaneously arranged between the connecting nozzle and the inlet end of the cavity container and between the outlet of the stop valve and the inlet of the integrated pipeline.

[0017] A method for collecting and processing liquid propellant, using the aforementioned collecting device without integrated pipelines and stop valves, and comprising the following steps:

[0018] Step 1: Connect the collecting device to the vacuum pump through the adapter, open the manual stop valve and the hand valve, turn on the vacuum pump, and observe the vacuum pressure gauge. When the reading of the vacuum pressure gauge reaches the preset pressure value, close the manual stop valve and the hand valve, remove the connection with the vacuum pump at the adapter, connect the collecting device to the filling pipeline or service valve through the adapter, open the manual stop valve and the hand valve, and collect the liquid propellant remaining in the filling pipeline or service valve into the cavity container through the negative pressure in the cavity container. When the reading of the vacuum pressure gauge becomes normal pressure, close the manual stop valve and the hand valve, remove the collecting device from the filling pipeline or service valve, and seal the adapter with a plug.

[0019] Step 2: At the collection site, place the filling pipe or service valve into the neutralizing liquid for soaking and cleaning, then transfer the collection device to a dedicated cleaning site, remove the vacuum pressure gauge, and then neutralize and clean the collection device.

[0020] Furthermore, the step 2 also includes cleaning the inlet end of the disassembled vacuum pressure gauge, rinsing the neutralized and cleaned collecting device with anhydrous ethanol and drying it, and sealing the inlet end and outlet end of the transfer joint, manual stop valve, hose, cavity container and hand valve in the collecting device.

[0021] A method for collecting and processing liquid propellant, using the aforementioned collecting device with integrated pipeline and stop valve, and comprising the following steps:

[0022] Step 1: Connect each cavity container to the vacuum pump through an adapter, open the manual stop valve and hand valve, turn on the vacuum pump, and observe the vacuum pressure gauge. When the reading of the vacuum pressure gauge reaches the preset pressure value, close the manual stop valve and hand valve, and remove the connection with the vacuum pump at the adapter;

[0023] Step 2: Connect multiple cavity containers to the connecting nozzles of the integrated pipeline one by one through manual stop valves, hoses and adapters, and then connect the stop valves to the filling pipeline or service valve. First, open the stop valve, then open the manual stop valve and hand valve corresponding to one of the cavity containers, and collect the liquid propellant remaining in the filling pipeline or service valve into the cavity container through the negative pressure in the cavity container. When the reading of the vacuum pressure gauge becomes normal pressure, close the manual stop valve and hand valve, and then open the manual stop valve and hand valve corresponding to another cavity container. Repeat the above process until the liquid propellant remaining in the filling pipeline or service valve is collected. Close the stop valve, separate the collecting device from the filling pipeline or service valve at the stop valve, and seal the stop valve inlet with a plug.

[0024] Step three: At the collection site, place the filling pipeline or service valve into the neutralizing liquid for soaking and cleaning, then transfer the collection device to a dedicated cleaning site, remove the vacuum pressure gauge, and then neutralize and clean the collection device.

[0025] A method for collecting and treating liquid propellant, using the aforementioned collecting device with integrated pipeline, stop valve and sodium bicarbonate or sodium persulfate filter, and comprising the following steps:

[0026] Step 1: Connect each cavity container to the vacuum pump through an adapter, open the manual stop valve and hand valve, turn on the vacuum pump, and observe the vacuum pressure gauge. When the reading of the vacuum pressure gauge reaches the preset pressure value, close the manual stop valve and hand valve, and remove the connection with the vacuum pump at the adapter;

[0027] Step 2: Connect multiple cavity containers to the connecting nozzles of the integrated pipeline one by one through manual stop valves, hoses, adapters and sodium bicarbonate or sodium persulfate filters, then install sodium bicarbonate or sodium persulfate filters between the integrated pipeline and the stop valve, and then connect the stop valve to the filling pipeline or service valve, first open the stop valve, then open the manual stop valve and hand valve corresponding to one of the cavity containers, collect the liquid propellant remaining in the filling pipeline or service valve into the sodium bicarbonate or sodium persulfate filter through the negative pressure in the cavity container, when the reading of the vacuum pressure gauge becomes normal pressure, close the manual stop valve and hand valve, then open the manual stop valve and hand valve corresponding to another cavity container, repeat the above process until the liquid propellant remaining in the filling pipeline or service valve is collected, close the stop valve, and separate the collection device from the filling pipeline or service valve at the stop valve;

[0028] Step 3: At the collection site, soak the filling pipe or service valve in neutralizing liquid for cleaning, remove and replace the new sodium bicarbonate or sodium persulfate filter for next use. Clean the cavity container, manual shut-off valve, hose and adapter as needed.

[0029] Compared with the prior art, the present invention is particularly suitable for the collection and treatment of volatile liquids, especially the collection and treatment of highly volatile and highly toxic liquid propellants. The collection device of the present invention is simple, reliable, and practical, and can effectively solve the problem of propellant pollution when the liquid propellant filling pipeline and service valve are removed, and can effectively protect the health of the operator.

[0030] Compared with the prior art, the present invention adopts different processing methods according to the collection amount of volatile liquid. When the volatile liquid is small, a single cavity container can be used. When the volatile liquid is large, a combination of multiple cavity containers is used to expand the collection volume.

[0031] Compared with the prior art, the present invention improves the safety of on-site collection of volatile liquids, and uses a filter with a neutralizing effect to neutralize the volatile liquids in real time during on-site collection, thereby avoiding accidental leakage during the transfer of volatile liquids, which may cause personal injury and environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of a collection device using a hose in the present invention;

[0033] Figure 2 It is a schematic diagram of the integrated pipeline and the stop valve in the present invention;

[0034] Figure 3 It is a schematic diagram of a collection device with an integrated pipeline, a stop valve and a sodium bicarbonate or sodium persulfate filter in the present invention;

[0035] In the figure, 1-adapter; 2-manual stop valve; 3-hose; 4-spherical container; 5-hand valve; 6-vacuum pressure gauge; 7-connecting nozzle; 8-stop valve; 9-sodium bicarbonate or sodium persulfate filter. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0037] The liquid propellant collection and processing method of the present invention is based on the following three ideas:

[0038] Idea 1: Connect the container with negative internal pressure to the filling pipe or service valve with residual propellant. When the internal pressure of the container becomes normal pressure, disconnect the filling pipe or service valve and seal the inlet of the container. Soak the disconnected filling pipe or service valve in neutralizing liquid on site and then transfer the container to a special cleaning site for neutralization cleaning.

[0039] Idea 2: Based on Idea 1, multiple containers are connected in parallel. By adding an integrated pipeline and a stop valve, the problem that a single container cannot collect a large amount of residual propellant can be solved.

[0040] Idea 3: Based on Idea 2, add a filter to neutralize the propellant. Select a suitable filter based on whether the propellant is an oxidizer or a fuel. Then use the negative pressure in the container to suck the propellant into the filter to complete the neutralization process. Instead of carrying the propellant to a dedicated site for cleaning, the propellant is neutralized on site to avoid accidental leakage during transfer.

[0041] When designing the liquid propellant collection device, the volume of the spherical container 4 is designed according to the amount of residual propellant to be collected and the size of the pipeline or service valve cavity. The volume of the spherical container 4 is generally more than 3 times the volume of the liquid propellant filling pipeline or service valve cavity. When the liquid propellant filling pipeline or service valve cavity is small, a spherical container 4 can be directly used in combination with a hose 3. When the liquid propellant filling pipeline or service valve cavity is large, the volume of the large cavity is split, and each small volume after the split corresponds to a spherical container 4 with a smaller volume, forming multiple sets of collection devices with a connecting pipeline and a stop valve 8 for use.

[0042] It should be noted that the inlet end and the outlet end in the present invention refer to the inlet end and the outlet end corresponding to the inflow direction of the propellant when the collecting device collects and processes the liquid propellant.

[0043] Example 1

[0044] like Figure 1 As shown, the liquid propellant collecting device includes an adapter 1, a manual stop valve 2, a hose 3, a spherical container 4, a hand valve 5 and a vacuum pressure gauge 6 which are connected from left to right. These components can be purchased on the market, and the selected materials are required to have good compatibility with the corresponding liquid propellant, generally requiring first-level compatibility. The material selected in this embodiment is stainless steel.

[0045] The stainless steel spherical container 4 includes two stainless steel stamped hemispheres. The surface of the stainless steel spherical container 4 is provided with a welding nozzle connected to the pipeline, a welding joint for installing a pressure gauge and a handle. The two stainless steel stamped hemispheres, the welding nozzle connected to the pipeline, and the welding joint for installing the pressure gauge are pickled, alkali washed, rinsed, dried, and welded into the stainless steel spherical container 4, and are used after passing the 2MP hydraulic test and the vacuum test with a vacuum degree of no more than 20Pa.

[0046] Clean the stainless steel adapter 1, the stainless steel manual stop valve 2, the stainless steel hose 3, the stainless steel spherical container 4, the stainless steel hand valve 5 and the inlet of the vacuum pressure gauge 6 with anhydrous ethanol and dry them.

[0047] according to Figure 1 Assemble and tighten the stainless steel adapter 1, stainless steel manual stop valve 2, stainless steel hose 3, stainless steel spherical container 4, stainless steel hand valve 5 and vacuum pressure gauge 6 in sequence.

[0048] Connect the adapter 1 of the liquid propellant collection device to the inlet of the vacuum equipment (such as a vacuum pump) and tighten it, open the stainless steel manual stop valve 2 and the stainless steel hand valve 5 in sequence, start the vacuum equipment, vacuum the stainless steel spherical container 4 to below 50Pa, close the stainless steel manual stop valve 2, turn off the vacuum equipment, release the vacuum pressure to atmospheric pressure, and remove the adapter 1.

[0049] Connect the liquid propellant collecting device to the liquid propellant filling service valve or one end of the pipeline through the adapter 1, open the stainless steel manual stop valve 2, and quickly close the stainless steel manual stop valve 2 when the reading of the vacuum pressure gauge 6 is normal pressure, close the stainless steel hand valve 5, remove the adapter 1 of the liquid propellant collecting device from the service valve (or pipeline), assemble the plug on the adapter 1 and tighten it, and immediately put the service valve (or pipeline) into the neutralizing liquid cleaning container and soak it for cleaning.

[0050] The liquid propellant collection device is transported to a special cleaning site for neutralization cleaning (the vacuum pressure gauge 6 is removed before cleaning, and the inlet of the vacuum pressure gauge 6 is cleaned separately and then stored). Clean for 5 minutes. After cleaning, rinse with anhydrous ethanol (rinsing time 3 minutes) and dry. Seal the outlet and inlet of each component in the collection device and place it in the specified storage area.

[0051] Example 2

[0052] When the liquid propellant filling pipeline or service valve has a large volume, the volume of the large volume is divided into a plurality of small volume spherical containers 4, according to Figure 1Six spherical containers 4 with smaller volumes are designed, and the six spherical containers 4 are evacuated (connected to the vacuum equipment through the adapter 1, and multiple spherical containers 4 are evacuated to a vacuum degree below 50Pa), and then the six stainless steel spherical containers 4 are fixed on the same trolley, and each spherical container 4 is connected to the adapter 1. Figure 2 6 connecting nozzles 7 of the integrated pipeline. Then connect the stop valve 8 to the filling pipeline or service valve, open the stop valve 8, open one of the manual stop valves 2 and the hand valve 5, and when the reading of the vacuum pressure gauge 6 corresponding to the hand valve 5 reaches normal pressure, close the manual stop valve 2 and the hand valve 5, open the next manual stop valve 2 and the hand valve 5, repeat the above process, wait until the readings of the 6 vacuum pressure gauges 6 reach normal pressure, close the stop valve 8 on the integrated pipeline, and install a plug at the entrance of the stop valve 8. Transfer the liquid propellant collection device to a dedicated site and process the collected liquid propellant.

[0053] Example 3

[0054] The difference from Example 2 is that the collection device is equipped with a sodium bicarbonate or sodium persulfate filter 9, such as Figure 3 On the one hand, a sodium bicarbonate or sodium persulfate filter 9 is installed between the connecting nozzle 7 and the manual stop valve 2, and on the other hand, a sodium bicarbonate or sodium persulfate filter 9 is installed between the stop valve 8 and the integrated pipeline.

[0055] Oxidizer liquid propellant collection device: Sodium bicarbonate filter (sodium bicarbonate is filled in the stainless steel shell), integrated pipeline (stainless steel material), stainless steel stop valve 8 are assembled together and the joints are tightened. Four sodium bicarbonate filters are assembled on the four connecting nozzles 7 of the integrated pipeline in turn, tightened, and pressed. Figure 3 Connect the spherical container 4 to the sodium bicarbonate filter outlet and tighten it.

[0056] Fuel liquid propellant collection device: sodium persulfate filter (sodium persulfate filled in the stainless steel shell), integrated pipeline (stainless steel material), stainless steel stop valve 8 are assembled together and the joints are tightened. Four sodium persulfate filters are assembled on the four connecting nozzles 7 of the integrated pipeline in turn and tightened. Figure 3 Connect the spherical container 4 to the sodium persulfate filter outlet and tighten it.

[0057] When used, collect as follows:

[0058] Treatment of residual liquid propellant in oxidizer service valve or pipeline: Connect the oxidizer liquid propellant collection device to one end of the service valve or pipeline, open the stainless steel stop valve 8 at the front end of the sodium bicarbonate filter, and then open the stainless steel manual stop valve 2 and hand valve 5 corresponding to one of the spherical containers 4, and absorb the residual liquid propellant into the sodium bicarbonate filter for neutralization treatment. After treatment, close the manual stop valve 2 and hand valve 5, and then open the stainless steel manual stop valve 2 and hand valve 5 corresponding to the next spherical container 4. Repeat the above process until the residual propellant is collected, and remove the oxidizer liquid propellant collection device from the oxidizer service valve or pipeline. As another solution, the stainless steel manual stop valves 2 and hand valves 5 corresponding to the four spherical containers 4 can also be opened at the same time.

[0059] Treatment of residual liquid propellant in fuel service valve or pipeline: Connect the fuel liquid propellant collection device to one end of the service valve or pipeline, open the stainless steel stop valve 8 at the front end of the sodium persulfate filter, and then open the stainless steel manual stop valve 2 and hand valve 5 corresponding to one of the spherical containers 4, and suck the residual liquid propellant into the sodium persulfate filter for neutralization treatment. After treatment, close the manual stop valve 2 and hand valve 5, and then open the stainless steel manual stop valve 2 and hand valve 5 corresponding to the next spherical container 4. Repeat the above process until the residual propellant is collected, and remove the oxidizer liquid propellant collection device from the fuel service valve or pipeline. As another solution, the stainless steel manual stop valves 2 and hand valves 5 corresponding to the four spherical containers 4 can also be opened at the same time.

[0060] It should be noted that a new sodium bicarbonate or sodium persulfate filter 9 needs to be replaced each time it is used, and the collecting device needs to be cleaned regularly.

[0061] The above is the basic structure of the present invention. All liquid propellant collection devices manufactured according to the present invention and liquid propellant collection and processing methods implemented therein fall within the protection scope of the present invention.

Claims

1. A liquid propellant collection device, Features: include: A manual stop valve (2), the inlet end of the manual stop valve (2) being connected to the adapter (1); A hose (3), wherein an inlet end of the hose (3) is connected to an outlet end of a manual stop valve (2); A hollow container, the inlet end of which is connected to the outlet end of the hose (3), and the internal cavity of the hollow container forms a liquid collection and temporary storage space; A hand valve (5), the inlet end of the hand valve (5) being connected to the outlet end of the cavity container; A vacuum pressure gauge (6) is connected to the outlet end of the hand valve (5).

2. A liquid propellant collecting device according to claim 1, Features: The materials of the manual stop valve (2), the hose (3), the cavity container and the hand valve (5) meet primary compatibility with the liquid propellant.

3. A liquid propellant collecting device according to claim 1, Features: The manual stop valve (2), the hose (3), the cavity container and the hand valve (5) are made of stainless steel.

4. A liquid propellant collecting device according to claim 1, Features: The cavity container is a complete cavity sphere formed by welding two hemispherical shells.

5. A liquid propellant collecting device according to claim 1, Features: The volume of the cavity container is more than 3 times the volume of the liquid propellant filling pipeline cavity or the service valve cavity.

6. A liquid propellant collection device according to claim 1, Features: It also includes an integrated pipeline and a stop valve (8), wherein the integrated pipeline is provided with a plurality of interconnected connecting nozzles (7), each connecting nozzle (7) corresponds to an inlet end of a cavity container, the inlet end of the integrated pipeline is connected to the outlet end of the stop valve (8), and the inlet end of the stop valve (8) is connected to a joint.

7. A liquid propellant collecting device according to claim 6, Features: The invention also comprises a sodium bicarbonate or sodium persulfate filter (9), wherein the sodium bicarbonate or sodium persulfate filter (9) is arranged between the connecting nozzle (7) and the inlet end of the cavity container, or between the outlet of the stop valve (8) and the inlet of the integrated pipeline, or simultaneously arranged between the connecting nozzle (7) and the inlet end of the cavity container and between the outlet of the stop valve (8) and the inlet of the integrated pipeline.

8. A method for collecting and processing liquid propellant, Features: The collecting device according to claim 1 is used, and comprises the following steps: Step 1: connect the collecting device to the vacuum pump via the adapter (1), open the manual stop valve (2) and the hand valve (5), turn on the vacuum pump, observe the vacuum pressure gauge (6), when the reading of the vacuum pressure gauge (6) reaches the preset pressure value, close the manual stop valve (2) and the hand valve (5), remove the connection with the vacuum pump at the adapter (1), connect the collecting device to the filling pipeline or service valve via the adapter (1), open the manual stop valve (2) and the hand valve (5), collect the liquid propellant remaining in the filling pipeline or service valve into the cavity container through the negative pressure in the cavity container, when the reading of the vacuum pressure gauge (6) becomes normal pressure, close the manual stop valve (2) and the hand valve (5), remove the collecting device from the filling pipeline or service valve, and seal the adapter (1) with a plug; Step 2: At the collection site, the filling pipeline or service valve is placed in a neutralizing liquid for soaking and cleaning, and then the collection device is transferred to a special cleaning site, and the vacuum pressure gauge (6) is disassembled and then the collection device is neutralized and cleaned.

9. A method for collecting and processing liquid propellant, Features: The collecting device according to claim 6 is used, and comprises the following steps: Step 1: Connect each cavity container to the vacuum pump via the adapter (1), open the manual stop valve (2) and the hand valve (5), turn on the vacuum pump, and observe the vacuum pressure gauge (6). When the reading of the vacuum pressure gauge (6) reaches a preset pressure value, close the manual stop valve (2) and the hand valve (5), and remove the connection with the vacuum pump at the adapter (1); Step 2: Connect multiple cavity containers to the connecting nozzles (7) of the integrated pipeline one by one through the manual stop valves (2), the hoses (3) and the adapter (1), and then connect the stop valves (8) to the filling pipeline or the service valve. First, open the stop valve (8), then open the manual stop valve (2) and the hand valve (5) corresponding to one of the cavity containers, and collect the liquid propellant remaining in the filling pipeline or the service valve into the cavity container through the negative pressure in the cavity container. When the reading of the vacuum pressure gauge (6) becomes normal pressure, close the manual stop valve (2) and the hand valve (5), and then open the manual stop valve (2) and the hand valve (5) corresponding to another cavity container. Repeat the above process until the liquid propellant remaining in the filling pipeline or the service valve is collected, close the stop valve (8), separate the collection device from the filling pipeline or the service valve at the stop valve (8), and seal the inlet of the stop valve (8) with a plug. Step three, at the collection site, place the filling pipeline or service valve into the neutralizing liquid for soaking and cleaning, then transfer the collection device to a special cleaning site, remove the vacuum pressure gauge (6), and then neutralize and clean the collection device.

10. A method for collecting and processing liquid propellant, Features: The collecting device according to claim 7 is used, and comprises the following steps: Step 1: Connect each cavity container to the vacuum pump via the adapter (1), open the manual stop valve (2) and the hand valve (5), turn on the vacuum pump, and observe the vacuum pressure gauge (6). When the reading of the vacuum pressure gauge (6) reaches a preset pressure value, close the manual stop valve (2) and the hand valve (5), and remove the connection with the vacuum pump at the adapter (1); Step 2: Connect multiple cavity containers to the connecting nozzles (7) of the integrated pipeline one by one through the manual stop valve (2), the hose (3), the adapter (1) and the sodium bicarbonate or sodium persulfate filter (9), then install the sodium bicarbonate or sodium persulfate filter (9) between the integrated pipeline and the stop valve (8), and then connect the stop valve (8) to the filling pipeline or service valve, first open the stop valve (8), then open the manual stop valve (2) and the hand valve (5) corresponding to one of the cavity containers, and then open the cavity container. The negative pressure inside collects the liquid propellant remaining in the filling pipeline or service valve into the sodium bicarbonate or sodium persulfate filter (9); when the reading of the vacuum pressure gauge (6) becomes normal pressure, the manual stop valve (2) and the hand valve (5) are closed, and then the manual stop valve (2) and the hand valve (5) corresponding to another cavity container are opened, and the above process is repeated until the liquid propellant remaining in the filling pipeline or service valve is collected, and the stop valve (8) is closed, and the collection device is separated from the filling pipeline or service valve at the stop valve (8); Step 3: At the collection site, the filling pipeline or service valve is placed in a neutralizing solution for soaking and cleaning, and a new sodium bicarbonate or sodium persulfate filter (9) is disassembled and replaced for next use.

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