Filling method and filling system for high-concentration hydrogen peroxide

Abstract

The invention discloses a high-concentration hydrogen peroxide filling method and system. The invention belongs to a filling system, and aims to solve the problem that safe and scientific hydrogen peroxide adding methods and equipment are urgently needed due to the fact that high-concentration hydrogen peroxide serving as an oxidizing agent in the field of spaceflight is extremely unstable in chemical performance, strict in compatibility with other materials and high in requirement for operation safety of a user. The invention provides a high-concentration hydrogen peroxide filling method and a high-concentration hydrogen peroxide filling system. Comprising a blowdown pipeline assembly and a filling and cleaning pipeline assembly, the whole system design can be correspondingly matched with a full-closed-loop filling process of cleaning, purging, transfer filling, filling, cleaning and purging, and a cleaning liquid source, a transfer filling port and a drain outlet are integrally connected through a second pipeline and a third pipeline in the filling and cleaning pipeline assembly; and the purging pipeline assembly is in butt joint with the third pipeline, so that front pretreatment and rear ending of the cleaning and purging functions in the whole filling process are achieved, impurities and hydrogen peroxide residues in the pipelines can be thoroughly removed, and the chemical stability of hydrogen peroxide in the filling process is effectively guaranteed.

Description

TECHNICAL FIELD

[0001] The application belongs to a filling system, and particularly relates to a high-concentration hydrogen peroxide filling method and filling system. BACKGROUND

[0002] With the development of the aerospace industry, green propellants are replacing combination fuels such as dinitrogen tetroxide / hydrazine which cause serious harm to human health and the environment. Hydrogen peroxide is widely used due to its non-toxic, non-polluting and high-density characteristics. Although high-concentration hydrogen peroxide is non-toxic and can be stored at room temperature, hydrogen peroxide is extremely unstable in chemical properties. If the heat generated during decomposition cannot be dissipated in time, the temperature and pressure will rise sharply, which may cause the explosion of the storage tank. Furthermore, the material compatibility of hydrogen peroxide is strict, and ordinary materials are easily catalytically decomposed to cause accidents or affect the concentration of hydrogen peroxide. In addition, due to the strong oxidizing and corrosive nature of high-concentration hydrogen peroxide, the operating safety of the user is required to be high. Therefore, a safe, scientific and reasonable hydrogen peroxide filling method and equipment is one of the key technologies for the application of hydrogen peroxide. SUMMARY

[0003] The application aims at the high-concentration hydrogen peroxide used as an oxidizing agent in the aerospace field, which is extremely unstable in chemical properties, has strict compatibility with other materials, and requires high operating safety of the user. A safe and scientific hydrogen peroxide filling method and equipment are provided.

[0004] In order to achieve the above-mentioned purpose, the application adopts the following technical solutions: In a first aspect, the application provides a high-concentration hydrogen peroxide filling system, comprising: a blowing pipeline assembly, a filling and cleaning pipeline assembly; The blowing pipeline assembly comprises a blowing pipeline and a blowing gas source installed at the inlet of the blowing pipeline; The filling and cleaning pipeline assembly comprises a first pipeline, a second pipeline and a third pipeline. One end of the first pipeline is closed, and the other end is provided with a vacuum pump. A buffer tank for containing dilute hydrogen peroxide molecular liquid is arranged on the first pipeline. One end of the second pipeline is connected to a hydrogen peroxide source, and the other end is connected to a cleaning liquid source. A first port of the other end is provided with a transfer port, and a third port is provided with a first drain. One end of the third pipeline is respectively connected to the cleaning liquid source, the transfer port and the first drain, and the other end is connected to a gas-liquid storage tank. A peristaltic pump is arranged on the third pipeline; The second pipeline and the third pipeline are connected, and the connection point is recorded as a first node. The first node is located between the peristaltic pump and the gas-liquid storage tank. The blowing pipeline is connected with the third pipeline, and the connection point is recorded as a second node. The second node is located between the first node and the gas-liquid storage tank. The first pipeline and the third pipeline are connected, and the connection point is recorded as a third node. The third node is located between the buffer tank and the closed end of the first pipeline.

[0005] Further, a pressure reducing valve, a gas filter, a first air control valve and a one-way valve are sequentially arranged on the blowing pipeline after the blowing gas source.

[0006] Further, a first temperature sensor and a first pressure sensor are arranged at the closed end of the first pipeline.

[0007] Further, a second air control valve is arranged on the first pipeline between the hydrogen peroxide source and the first node, and a third air control valve is arranged between the first node and the cleaning liquid source.

[0008] Further, a fourth air control valve is arranged on the third pipeline between the peristaltic pump and the cleaning liquid source, a fifth air control valve is arranged between the peristaltic pump and the transfer port, a sixth air control valve is arranged between the peristaltic pump and the first sewage port, and a seventh air control valve and a manual stop valve are sequentially arranged between the peristaltic pump and the gas-liquid storage tank.

[0009] Further, a second temperature sensor is arranged between the first node and the seventh air control valve, a second pressure sensor is arranged at the second node, and a liquid filter is arranged between the second node and the manual stop valve.

[0010] Further, an eighth air control valve is arranged between the manual stop valve and the gas-liquid storage tank, and a ninth air control valve and a second sewage port are sequentially arranged between the manual stop valve and the eighth air control valve.

[0011] In a second aspect, the application provides a high-concentration hydrogen peroxide filling method using the high-concentration hydrogen peroxide filling system described above, comprising: Injecting cleaning liquid from the cleaning liquid source to sequentially clean the third pipeline, the second pipeline and the transfer port; Connecting a blowing gas source to the blowing pipeline inlet to sequentially blow the blowing pipeline, the third pipeline after the second node, the second pipeline after the first node, and the transfer port; Vacuumizing the first pipeline, the third pipeline and the first pipeline, and the gas-liquid storage tank by the vacuum pump; Transferring hydrogen peroxide from the hydrogen peroxide source to the transfer tank connected to the transfer port by the second pipeline and the peristaltic pump; The hydrogen peroxide in the transfer tank is extruded to the gas-liquid storage tank through the third pipeline by the vacuum pump, and then the hydrogen peroxide is filled from the hydrogen peroxide source to the gas-liquid storage tank through the third pipeline by the peristaltic pump until the filling is completed.

[0012] Further, after the filling is completed, further comprising: Rest for a preset time, and monitor the pressure of the filled hydrogen peroxide during the rest.

[0013] Further, after the rest, further comprising: The blow-off pipeline, the first pipeline, the second pipeline and the third pipeline are cleaned and purged.

[0014] Compared with the prior art, the present application has the following beneficial effects: The present application proposes a high-concentration hydrogen peroxide filling system, which includes a blow-off pipeline assembly and a filling and cleaning pipeline assembly. The structure design of the whole system can correspond to the full-closed-loop filling process of cleaning, purging, transfer, filling, cleaning and purging. Relying on the integrated connection of the second pipeline, the third pipeline and the blow-off pipeline assembly to the cleaning liquid source, the transfer port and the sewage port in the filling and cleaning pipeline assembly, the cleaning and purging functions are realized in the front-end preprocessing and the end tailing of the filling whole process, which can completely remove impurities in the pipeline, prevent impurities from catalyzing the decomposition of hydrogen peroxide, and effectively ensure the chemical stability of hydrogen peroxide during the filling process. Then, the peristaltic pump and the vacuum pump as the execution parts, and the on-off control of each pipeline can be integrated and arranged, which provides a structural basis for remote control, can avoid direct contact between the operator and the high-concentration hydrogen peroxide, and greatly improves the safety of the filling operation from the operation level. In addition, relying on the vacuum pump and the buffer tank structure of the first pipeline, the vacuumizing function can be realized, and cooperating with the setting of the peristaltic pump on the third pipeline, the combined filling mode of vacuum extrusion and peristaltic pump extrusion can be constructed, and the integrated design of the peristaltic pump can directly adapt to the remote flow regulation function, which significantly improves the reliability and accuracy of the filling process. Furthermore, the peristaltic pump can be controlled in cooperation with each pipeline and node, the forward and reverse extrusion and speed regulation functions of the peristaltic pump can be fully utilized, and multiple functions such as cleaning liquid delivery, hydrogen peroxide transfer and filling can be realized, without additional redundant pumps and pipelines, which effectively simplifies the number of equipment parts and pipeline layout, makes the system structure more simple, and reduces the equipment manufacturing, transportation and operation and maintenance costs.

[0015] The present application also proposes a high-concentration hydrogen peroxide filling method, which has all the advantages of the above high-concentration hydrogen peroxide filling. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0017] Figure 1 A schematic diagram of the high-concentration hydrogen peroxide filling system of the present application.

[0018] Wherein: 1-Peristaltic pump, 2-Vacuum pump, 3-Pressure reducing valve, 4-Gas filter, 5-Liquid filter, 6-Check valve, 7-First temperature sensor, 8-First pressure sensor, 9-Second pressure sensor, 10-Second temperature sensor, 11-Fourth air control valve, 12-Third air control valve, 13-Fifth air control valve, 14-Sixth air control valve, 15-Seventh air control valve, 16-Tenth air control valve, 17-Eighth air control valve, 18-Ninth air control valve, 19-Second air control valve, 20-First air control valve, 21-Hand-operated stop valve, 22-Cleaning liquid source, 23-Transfer port, 24-First blowdown port, 25-Blowdown gas source, 26-Gas-liquid storage tank, 27-Second blowdown port DETAILED DESCRIPTION In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will combine the drawings in the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0020] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0021] In the description of the embodiments of the present application, it should be explained that if the terms "upper", "lower", "horizontal", "inner" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, or the orientation or position relationship of the product of the present application when it is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation to the present application. In addition, the terms "first", "second" and the like are only used for differentiation, and cannot be understood as indicating or implying relative importance.

[0022] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0023] In the description of the embodiments of the present application, it should be explained that unless otherwise explicitly specified and limited, if the terms "set", "install", "connect", "connect" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] With the rapid development of global aerospace industry, the environmental protection and safety of propellants have become the core demand of the industry development. The traditional dinitrogen tetroxide / hydrazine propellant combination has strong toxicity and high pollution, which causes serious harm to the health of operating personnel and the ecological environment, and has been difficult to meet the green requirements of modern aerospace development. Under this background, green propellant gradually becomes the core direction to replace traditional toxic propellant. Among them, hydrogen peroxide as a non-toxic, non-polluting, high-density oxidizing agent, with its excellent environmental compatibility and energy characteristics, is increasingly widely used in launch vehicles, satellites, deep space probes and other aerospace equipment.

[0025] In the practical application of high-concentration hydrogen peroxide, especially in the scenario of space propulsion agent filling, there are many key problems to be solved, which are derived from its own chemical properties and the high requirements of the application environment. First, the problem of chemical instability. High-concentration hydrogen peroxide itself has a spontaneous decomposition trend, and the decomposition reaction will release oxygen and heat. Light, trace impurities, metal ions or environmental temperature rise will all sharply accelerate this decomposition process, leading to rapid accumulation of heat and gas. If the heat generated by decomposition cannot be dissipated in time, it will cause the rapid rise of system temperature and pressure. Once it exceeds the carrying limit of the storage tank and other equipment, it is easy to cause the explosion of the storage tank and other malignant accidents. Second, the problem of strict material compatibility. The range of materials that can safely coexist with high-concentration hydrogen peroxide is extremely narrow, including only a few materials such as special stainless steel and polytetrafluoroethylene. The stainless steel material must be subjected to strict pickling, passivation and hydrogen peroxide immersion test before use to ensure that there is no oxide layer and impurity residue on the surface. Ordinary metals, plastics and other materials will catalyze the decomposition of high-concentration hydrogen peroxide when they come into contact, leading to safety accidents. Third, the problem of extremely high safety operation requirements. High-concentration hydrogen peroxide has strong oxidizing and corrosive properties. Once it comes into contact with human skin, it will cause serious burns. When it comes into contact with organic matter, it may cause violent oxidation reaction or even burning. Therefore, all operations involving high-concentration hydrogen peroxide need to develop extremely strict operating procedures and be equipped with a complete set of protective equipment, which greatly increases the operation difficulty and cost.

[0026] In view of the above problems in the application of high-concentration hydrogen peroxide, the prior art has proposed some preliminary solutions. In response to chemical instability, the prior art mainly slows down the spontaneous decomposition rate of hydrogen peroxide by optimizing the storage environment and adding trace amounts of stabilizers to hydrogen peroxide. In the design of filling pipelines, closed pipelines are used to reduce air contact and reduce the risk of impurity mixing. Although the prior art has taken the above measures, there are still many deficiencies in the high-concentration hydrogen peroxide, especially in the scene of filling space propulsion, and a perfect safety protection system has not yet been formed. The main problems are as follows: The existing anti-impurity measures in the storage and filling process are not comprehensive enough, and can only reduce the mixing of external impurities to a certain extent, but cannot completely remove the residual impurities in the pipeline. These residual impurities are still an important inducement for the decomposition of hydrogen peroxide. The existing material compatibility control only focuses on material selection and does not consider the material matching problem of pipeline connection nodes and sealing elements. These parts often become weak links for catalytic decomposition. The existing safety operation protection measures are mainly passive protection, and semi-automatic operation equipment still needs to be monitored by operators on site, which cannot completely avoid the risk of contact between personnel and high-concentration hydrogen peroxide. At the same time, the existing monitoring means is relatively single, mainly monitoring pressure parameters, lacking real-time monitoring of temperature parameters, and being difficult to fully predict the decomposition risk. In addition, the existing filling system is mainly designed for single function, and the functions of cleaning, purging and filling are scattered, which not only increases the equipment size and operation and maintenance cost, but also easily causes medium residue and cross contamination during function switching, further increasing the safety risk.

[0027] In summary, the prior art still cannot fully meet the needs of safe and efficient filling of high-concentration hydrogen peroxide, especially the high reliability and high safety requirements of the filling system in the field of aerospace. Therefore, there is an urgent need for an integrated, full-process prevention and control, and precise controllable high-concentration hydrogen peroxide filling system. Based on the above situation, the present application proposes a filling method and system for high-concentration hydrogen peroxide, which will be further described in detail below in conjunction with the embodiments and drawings.

[0028] As a basic embodiment of the high-concentration hydrogen peroxide filling system of the present application, it can include a blowing pipeline assembly, a filling and cleaning pipeline assembly.

[0029] The blowing pipeline assembly includes a blowing pipeline and a blowing gas source 25 installed at the inlet of the blowing pipeline. The blowing gas source 25 provides clean and dry inert gas to avoid the introduction of oxygen or impurities during the purging process, which can catalyze the decomposition of high-concentration hydrogen peroxide. The clean purging gas is precisely delivered to the filling and cleaning pipeline assembly through the blowing pipeline to achieve the blowing dry of residual cleaning liquid, the removal of small impurities, and the replacement of air in the pipeline, creating an oxygen-free and clean environment for hydrogen peroxide filling.

[0030] The filling and cleaning pipeline assembly includes a first pipeline, a second pipeline, and a third pipeline. The first pipeline is closed at one end and has a vacuum pump 2 installed at the other end. A buffer tank for holding the cleaning liquid is installed on the first pipeline. The closed end of the first pipeline, with the vacuum pump 2 at the other, creates a stable negative pressure chamber, ensuring efficient vacuuming and providing a stable environment for sensor installation. The core function of the vacuum pump 2 is to extract gas from the pipeline, creating negative pressure in the third pipeline, the second pipeline, and the gas-liquid storage tank 26, providing the power for subsequent vacuum compression filling and avoiding the risk of decomposition due to gas mixing during hydrogen peroxide filling. The cleaning liquid in the buffer tank forms a liquid seal, preventing high-concentration hydrogen peroxide from being drawn into the vacuum pump 2 during vacuuming, avoiding oxidation and corrosion of the pump body due to contact with hydrogen peroxide, and ensuring the normal operation of the vacuum pump 2. The second pipeline is connected to a hydrogen peroxide source at one end and to a cleaning liquid source 22 at the first port of the other end. A transfer port 23 is installed at the second port, and a first drain port 24 is installed at the third port. The second pipeline connects to a hydrogen peroxide source at one end to provide the system with the necessary materials. The other end has three ports connected to a cleaning liquid source 22, a transfer port 23, and a first drain port 24, respectively. This allows for the introduction of cleaning liquid, the transfer of hydrogen peroxide, and the discharge of waste liquid. The transfer port 23 connects to an external metering container for batch transfer and precise metering of hydrogen peroxide, avoiding metering errors caused by direct addition from the hydrogen peroxide source. The first drain port 24 collects and discharges waste liquid containing impurities generated during the cleaning process and residual hydrogen peroxide after addition, preventing pipeline contamination or decomposition risks. The third pipeline connects to the cleaning liquid source 22, the transfer port 23, and the first drain port 24 at one end, and to a gas-liquid storage tank 26 at the other end. A peristaltic pump 1 is installed on the third pipeline. The third pipeline performs multiple functions, including cleaning liquid transport, hydrogen peroxide addition, and purging gas flow, ensuring smooth media transmission. The peristaltic pump 1 provides stable power for media transport and has forward / reverse rotation and speed adjustment functions to adapt to different operating conditions. The gas-liquid storage tank 26 is used to safely store the high-concentration hydrogen peroxide after filling, providing a stable supply of materials for subsequent use.

[0031] The second and third pipes are connected, and the connection point is denoted as the first node. The first node is located between the peristaltic pump 1 and the gas-liquid storage tank 26. The purging pipe is connected to the third pipe, and the connection point is denoted as the second node. The second node is located between the first node and the gas-liquid storage tank 26. The first and third pipes are connected, and the connection point is denoted as the third node. The third node is located between the buffer tank and the closed end of the first pipe.

[0032] This application enables the filling of rocket engine capsule-type propellant tanks with 90% hydrogen peroxide solution. The system can be used for filling at launch range technical sites. In practical applications, remote control can be employed, eliminating the need for on-site personnel during filling and preventing injury to workers in case of accidents. Furthermore, a robust and reliable filling method and procedure can be designed to ensure the safety and reliability of the filling process. This application has been applied multiple times at a rocket engine test site and has undergone launch range verification, demonstrating that the equipment and filling scheme are reliable, safe, and highly secure.

[0033] like Figure 1 The diagram shown is a schematic of a high-concentration hydrogen peroxide refueling system according to this application, which may include a purging pipeline assembly and a refueling and cleaning pipeline assembly.

[0034] In this embodiment, the purging gas source 25 uses a high-purity nitrogen cylinder to ensure that the purging gas is free of impurities. Along the purging pipeline, a pressure reducing valve 3, a gas filter 4, a first gas control valve 20, and a one-way valve 6 are installed in series along the gas flow direction of the purging gas source 25. The pressure reducing valve 3 reduces the high-pressure gas from the nitrogen cylinder to a suitable purging pressure. The gas filter 4 filters out small particulate impurities in the nitrogen to prevent them from entering the subsequent liquid path. The first gas control valve 20 can be adapted to remote electrical control requirements. The one-way valve 6 only allows nitrogen to flow from the purging pipeline to the filling and cleaning pipeline, preventing subsequent liquid backflow from damaging the purging pipeline components. The end of the purging pipeline connects to the third pipeline of the filling and cleaning pipeline components at the second node, which is located between the first node and the gas-liquid storage tank 26, ensuring that nitrogen can accurately purge the core filling section of the third pipeline and the connection section of the gas-liquid storage tank 26.

[0035] A buffer tank is welded and fixed on the first pipeline near the vacuum pump 2. A certain amount of deionized water is pre-filled in the buffer tank as a cleaning liquid to prevent high concentrations of hydrogen peroxide from being drawn into the vacuum pump 2, which would cause oxidation and corrosion of the pump body.

[0036] A first temperature sensor 7 and a first pressure sensor 8 are threadedly connected to the closed end of the first pipeline. These sensors are used to monitor the pipeline's temperature and pressure status in real time during the vacuuming and settling stages. A second pneumatic control valve 19 and a third pneumatic control valve 12 are also connected in series on the first pipeline. The second pneumatic control valve 19 is located between the hydrogen peroxide source and the first node, while the third pneumatic control valve 12 is located between the first node and the cleaning liquid source 22. These two valves enable precise control of the connection status between the hydrogen peroxide source, the cleaning liquid source 22, and the first node. The middle section of the first pipeline connects to the third pipeline at the third node, which is located between the buffer tank and the closed end of the first pipeline. This ensures that the vacuum pump 2 can extract gas from the third pipeline and the second pipeline through the third node.

[0037] The second pipeline is detachably connected to a hydrogen peroxide source at one end, and branches into three ports at the other end: a first port, a second port, and a third port. The first port connects to the cleaning liquid source 22 via a quick-connect coupling. The second port is a transfer port 23, which connects to the inlet of an external transfer tank via a flange. The bottom of the transfer tank is placed on an electronic weighing instrument for precise metering of the filling volume. The third port is the first drain port 24, which connects to a waste liquid collection tank via a pipeline. A sealing cap is installed at the first drain port 24, which is closed when not draining. The middle of the second pipeline connects to the third pipeline at the first node, which is located between the peristaltic pump 1 and the gas-liquid storage tank 26, ensuring that the hydrogen peroxide and cleaning liquid transported by the second pipeline can accurately enter the core filling section of the third pipeline. One end of the third pipeline is connected to the cleaning liquid source 22, the transfer port 23, and the first drain port 24 via a tee connector, and the other end is detachably connected to the filling port of the gas-liquid storage tank 26 via a quick-connect coupling, which can be adapted to the propellant storage requirements of rocket engines.

[0038] The third pipeline is equipped with a peristaltic pump 1, a fourth pneumatic control valve 11, a fifth pneumatic control valve 13, a sixth pneumatic control valve 14, a seventh pneumatic control valve 15, and a manual shut-off valve 21, all connected in series. The peristaltic pump 1 supports forward and reverse rotation and remote speed adjustment. The fourth pneumatic control valve 11 is located between the peristaltic pump 1 and the cleaning liquid source 22. The fifth pneumatic control valve 13 is located between the peristaltic pump 1 and the transfer port 23. The sixth pneumatic control valve 14 is located between the peristaltic pump 1 and the first drain port 24. The seventh pneumatic control valve 15 is located between the peristaltic pump 1 and the gas-liquid storage tank 26. The manual shut-off valve 21 is set to a normally open state and used as an emergency shut-off valve.

[0039] A second temperature sensor 10, a second pressure sensor 9, and a liquid filter 5 are also fixed on the third pipeline. The second temperature sensor 10 can be the same model as the first temperature sensor 7 and is fixedly installed between the first node and the seventh pneumatic control valve 15 to monitor the temperature of hydrogen peroxide in real time during the filling process. The second pressure sensor 9 can be the same model as the first pressure sensor 8 and is fixedly installed at the second node to monitor the pipeline pressure in real time during the filling and vacuum extrusion processes. The liquid filter 5 is installed between the second node and the manual shut-off valve 21 to filter out minute impurities in the hydrogen peroxide, further ensuring the stability of the hydrogen peroxide. An eighth pneumatic control valve 17 is installed in series between the manual shut-off valve 21 and the gas-liquid storage tank 26. A ninth pneumatic control valve 18 and a second drain port 27 are branched between the manual shut-off valve 21 and the eighth pneumatic control valve 17 via a tee connector. The second drain port 27 is connected to the waste liquid collection tank, forming an overflow and emergency drain channel for overflow pressure relief in case of overfilling and for draining waste after filling.

[0040] In some embodiments of this application, a remote control box may also be included. The remote control box is electrically connected to each pneumatic control valve, vacuum pump 2, peristaltic pump 1, first temperature sensor 7, second temperature sensor 10, first pressure sensor 8, and second pressure sensor 9 via a long cable. The control signals of each pneumatic control valve, vacuum pump 2, and peristaltic pump 1 can be output by the PLC controller of the remote control box. The monitoring signals of the first temperature sensor 7, second temperature sensor 10, first pressure sensor 8, and second pressure sensor 9 are transmitted to the display on the remote control box, realizing real-time visualization of temperature and pressure data, facilitating remote monitoring and rapid response to abnormal conditions by operators.

[0041] This application enables a fully closed-loop refueling process encompassing cleaning, purging, transfer, refueling, cleaning, and purging. Precise docking of the purging pipeline assembly with the third pipeline achieves full-process purging coverage. Electrical connection between each pneumatic control valve and the remote control box enables remote control of pump and valve actions throughout the process. Furthermore, the vacuum pump 2 and buffer tank structure in the first pipeline, along with the coordination with the peristaltic pump 1 on the third pipeline, achieve a combined refueling process of vacuum compression and peristaltic pump 1 compression. The precise placement of the first temperature sensor 7, second temperature sensor 10, first pressure sensor 8, and second pressure sensor 9 enables real-time monitoring of the hydrogen peroxide state. The forward / reverse rotation and speed adjustment functions of the single peristaltic pump 1 simplify equipment configuration, reduce maintenance costs, and perfectly meet the safe and reliable refueling requirements of high-concentration hydrogen peroxide at aerospace test ranges.

[0042] This application includes a remote control box and a local refueling section in practical application. The local refueling section is located next to the engine reservoir. Using the system of this application, refueling is carried out by vacuum compression and peristaltic pump 1 compression. The refueling pipeline is equipped with vacuum pump 2 and peristaltic pump 1. A buffer tank is installed before vacuum pump 2, which stores a certain amount of deionized water to prevent hydrogen peroxide from entering vacuum pump 2 and damaging it. The refueling line includes two parts: transfer and refueling. The transfer and refueling of hydrogen peroxide solution are achieved by the forward and reverse rotation of peristaltic pump 1. The forward and reverse rotation of peristaltic pump 1 is also used to flush the pipeline. Pressure sensors and temperature sensors are installed on the refueling pipeline to monitor the state of hydrogen peroxide solution in the pipeline in real time. All valves can be made of stainless steel and fluoroplastics that are compatible with hydrogen peroxide, and all pipelines in contact with hydrogen peroxide can be made of 316L stainless steel. The remote control box is equipped with valve control switches, vacuum pump 2 switch, peristaltic pump 1 switch, peristaltic pump 1 forward and reverse switch, peristaltic pump 1 speed control button, and pressure and temperature display. The remote control box is connected to the ground filling section by a long cable.

[0043] The high-concentration hydrogen peroxide refilling method based on this embodiment involves the following steps: Before refilling, a peristaltic pump 1 is used in conjunction with a valve to clean the refilling pipeline. After cleaning, a nitrogen cylinder is used in conjunction with a valve to purge the refilling pipeline. After purging, hydrogen peroxide is transferred to a transfer tank, which is placed on a weighing instrument to measure the weight of hydrogen peroxide before and after refilling. After transfer, the pipeline and storage tank are evacuated. After evacuation, the valve is opened for vacuum compression. Once the vacuum compression is stable, peristaltic pump 1 is used for compression. After the required weight is added, peristaltic pump 1 is turned off, completing the refilling process. The pipeline is then cleaned and purged again after refilling. Specifically, this process may include: (1) Check and confirm.

[0044] Check that all connections are secure and that all external pipelines are in place. Then check that all valves, vacuum pump 2, and peristaltic pump 1 are functioning correctly. Finally, check that the signal transmission from the remote control box to the high-concentration hydrogen peroxide filling system is normal.

[0045] After completing the above checks and confirmations, the specific refueling operation can begin using the high-concentration hydrogen peroxide refueling system.

[0046] (2) Clean the pipeline before adding.

[0047] Open the fourth pneumatic control valve 11, the seventh pneumatic control valve 15, the eighth pneumatic control valve 17, and the manual shut-off valve 21, with the manual shut-off valve 21 set to the normally open position. Rotate the peristaltic pump 1 forward to clean the filling pipeline. After completion, close the eighth pneumatic control valve 17 and open the ninth pneumatic control valve 18 to clean the second drain port 27. After cleaning, close the seventh pneumatic control valve 15 and the ninth pneumatic control valve 18, and open the second pneumatic control valve 19 to clean the hydrogen peroxide source inlet. After completion, close all open valves and the peristaltic pump 1. Then open the third pneumatic control valve 12 and the fifth pneumatic control valve 13 to reverse the peristaltic pump 1 and clean the transfer port 23. After completion, close all open valves and the peristaltic pump 1.

[0048] By switching the peristaltic pump 1 in both forward and reverse directions, and coordinating the opening and closing of the corresponding pneumatic control valves, precise cleaning of different pipeline channels is achieved without cross-contamination. First, the designated pneumatic control valve and the normally open manual shut-off valve 21 are opened, and the peristaltic pump 1 is started in forward rotation. The squeezing force of the peristaltic pump 1 delivers the cleaning liquid to the main refueling pipeline, thoroughly flushing the core refueling channel from the transfer tank to the rocket propellant tank. The flushed wastewater containing impurities is discharged into the waste liquid collection tank through the second drain port 27. After the main refueling pipeline is cleaned, the opening and closing states of the corresponding pneumatic control valves are switched. The main refueling pipeline cleaning valve is closed, and the pneumatic control valve corresponding to the overflow port is opened. The peristaltic pump 1 continues to deliver deionized water in forward rotation to specifically clean the overflow pipeline, preventing residual impurities at the second drain port 27 from being carried into the main liquid path during subsequent refueling. After the second drain outlet 27 is cleaned, the pneumatic control valve is switched again to connect the hydrogen peroxide source. The hydrogen peroxide source interface and connected branch pipe are then cleaned. This interface is the first channel for hydrogen peroxide to enter the system, and thorough cleaning can prevent impurities from being mixed in when the hydrogen peroxide source is connected. After completing the above forward cleaning, all corresponding valves and peristaltic pump 1 are closed, and then the fifth pneumatic control valve 13 is opened to start peristaltic pump 1 in reverse. The reverse squeezing force is used to deliver the cleaning liquid to the connecting pipeline between the transfer tank and the filling system, and the branch pipe of transfer outlet 23 is flushed in reverse to further remove residual impurities in the branch pipe and ensure the cleanliness of the transfer channel. Pipeline cleaning can thoroughly remove all impurities in the entire refueling pipeline system that come into contact with hydrogen peroxide, including residual metal shavings, dust, oil, organic matter, and trace contaminants that adhere to the pipeline during periods of inactivity. These impurities are strong catalysts for the decomposition and exothermic reaction of high-concentration hydrogen peroxide. If not thoroughly removed, hydrogen peroxide will decompose upon contact, causing a sharp increase in temperature and pressure within the pipeline, affecting refueling accuracy or potentially leading to an explosion.

[0049] (3) Purge the pipeline.

[0050] Open the seventh pneumatic control valve 15 and the first pneumatic control valve 20 to purge the filling pipeline. After completion, close the seventh pneumatic control valve 15, open the ninth pneumatic control valve 18 to purge the second drain port 27, close the ninth pneumatic control valve 18, open the seventh pneumatic control valve 15 and the second pneumatic control valve 19 to purge the hydrogen peroxide source interface. After completion, close the seventh pneumatic control valve 15, open the fifth pneumatic control valve 13 to purge the transfer port 23, and close the fifth pneumatic control valve 13, the seventh pneumatic control valve 15, and the first pneumatic control valve 20 to complete the pipeline purging.

[0051] The cleaning liquid remaining in the pipeline is blown out and dried, and trace impurities are removed. The air in the pipeline is replaced to create an inert environment, which avoids the dilution of hydrogen peroxide by moisture, the catalytic decomposition of impurities, and the reaction caused by contact between air and hydrogen peroxide.

[0052] (4) Vacuuming.

[0053] Open the eighth pneumatic control valve 17 and the tenth pneumatic control valve 16, and then turn on the vacuum pump 2. When the pipeline pressure and the gas-liquid storage tank 26 reach the required vacuum value, close the eighth pneumatic control valve 17, the tenth pneumatic control valve 16 and the vacuum pump 2.

[0054] During the vacuuming process, the first temperature sensor 7 and the first pressure sensor 8 at the closed end of the first pipeline can monitor the temperature and pressure status of the pipeline in real time, while the second pressure sensor 9 at the second node of the third pipeline can monitor the vacuum level of the main pipeline. Simultaneously, the buffer tank on the first pipeline prevents trace amounts of residual cleaning liquid or potentially added hydrogen peroxide from being drawn into the vacuum pump 2, thus avoiding oxidation and corrosion damage to the pump body. When the first pressure sensor 8 or the second pressure sensor indicates that the vacuum value in the pipeline and the gas-liquid storage tank 26 has reached the preset requirement, all relevant gas control valves and the vacuum pump 2 are closed to maintain a negative pressure state in the system, preparing for subsequent refueling.

[0055] 5) Transfer of capital.

[0056] The second pneumatic control valve 19 and the fifth pneumatic control valve 13 are opened in sequence to reverse the peristaltic pump 1, transferring the hydrogen peroxide solution into the transfer tank, which is then weighed. The transfer tank is connected to the transfer port 23.

[0057] During the filling process, a weighing instrument records the weight changes of the transfer tank in real time, accurately measuring the total amount of hydrogen peroxide transferred. The reverse rotation of peristaltic pump 1 avoids mechanical disturbance to the hydrogen peroxide caused by negative pressure suction, reducing the risk of decomposition. Simultaneously, the closed pipeline design ensures that the hydrogen peroxide does not come into contact with air, guaranteeing stability. After the transfer is completed, the weighing instrument confirms that the transferred volume meets the filling requirements.

[0058] (6) Vacuum extrusion.

[0059] Open the fifth gas control valve 13, the seventh gas control valve 15 and the eighth gas control valve 17, and use atmospheric pressure to add hydrogen peroxide into the gas-liquid storage tank 26.

[0060] During the vacuum extrusion process, no pump power is involved, and the hydrogen peroxide flows smoothly. The second pressure sensor 9 at the second node monitors the main pipeline pressure changes in real time, and the first temperature sensor 7 at the closed end of the first pipeline monitors the pipeline temperature to ensure no abnormal temperature or pressure rise. When the pressure shown by the second pressure sensor 9 gradually stabilizes, it indicates that the negative pressure in the gas-liquid storage tank 26 is gradually offset, the vacuum extrusion efficiency decreases, and the filling in this stage is completed, preparing for the subsequent filling by the peristaltic pump 1.

[0061] (7) Peristaltic pump 1 is used for filling.

[0062] After the second pressure sensor 9 detects that the pressure has stabilized, turn on the peristaltic pump 1 and inject the filler by squeezing it out. During the filling process, continuously observe the temperature and pressure in the pipeline.

[0063] During the refueling process, the second temperature sensor 10 monitors the hydrogen peroxide temperature in real time, and the second pressure sensor 9 monitors the main pipeline pressure. Operators can observe the data remotely. If an abnormal increase in temperature or pressure occurs, the peristaltic pump 1 speed can be adjusted or the pump can be stopped immediately to prevent the risk from escalating. The speed regulation function of the peristaltic pump 1 can precisely control the refueling flow rate to ensure refueling accuracy. At the same time, the closed pipeline design prevents hydrogen peroxide from contacting air, further improving stability.

[0064] (8) The filling is complete.

[0065] After calculating the required filling volume using a weighing instrument, the fifth pneumatic control valve 13, the seventh pneumatic control valve 15, and the eighth pneumatic control valve 17 are closed sequentially. Then, the peristaltic pump 1 is turned off to complete the filling process. The weighing instrument is used to weigh the hydrogen peroxide to determine the weight of the hydrogen peroxide already added.

[0066] It should be noted that the sequence of closing the valves and pumps can prevent overfilling due to the inertia of the peristaltic pump 1. Simultaneously, the closure of each gas control valve creates a liquid seal in the pipeline, preventing hydrogen peroxide in the gas-liquid storage tank 26 from flowing back into the filling pipeline and causing secondary contamination or decomposition risks. After closing the valves, the pipeline pressure can be reconfirmed to be stable using either the first pressure sensor 8 or the second pressure sensor 9 to ensure safe discontinuation of filling.

[0067] (9) Let stand still.

[0068] After filling, let it stand for about 30 minutes and observe the pressure of the hydrogen peroxide solution in the gas-liquid storage tank 26.

[0069] It should be noted that high-concentration hydrogen peroxide will slowly decompose spontaneously at room temperature. If the temperature and pressure remain stable during the standing process, it indicates that the decomposition rate is within a safe range. If an abnormal increase in temperature and pressure occurs, it is necessary to promptly release pressure and drain the liquid through the second drain outlet 27 or the first drain outlet 24 to prevent the risk from escalating.

[0070] (10) Cleaning and purging after filling.

[0071] The pipeline was cleaned and purged according to the pre-filling procedure, and the liquid in the drain tank and transfer tank was properly disposed of.

[0072] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A high-concentration hydrogen peroxide dispensing system, characterized in that, include: Blowing up, filling and cleaning piping assemblies; The purge piping assembly includes a purge pipe and a purge gas source (25) installed at the inlet of the purge pipe; The filling and cleaning pipeline assembly includes a first pipeline, a second pipeline, and a third pipeline; the first pipeline is closed at one end and equipped with a vacuum pump (2) at the other end, and is equipped with a buffer tank for holding diluted hydrogen peroxide molecules; the second pipeline is connected to a hydrogen peroxide source at one end, and to a cleaning liquid source (22) at the first port of the other end, with a transfer port (23) at the second port and a first drain port (24) at the third port; the third pipeline is connected to the cleaning liquid source (22), the transfer port (23), and the first drain port (24) at one end, and to a gas-liquid storage tank (26) at the other end, and is equipped with a peristaltic pump (1); The second pipe and the third pipe are connected, and the connection point is called the first node. The first node is located between the peristaltic pump (1) and the gas-liquid storage tank (26). The purging pipe is connected to the third pipe, and the connection point is called the second node. The second node is located between the first node and the gas-liquid storage tank (26). The first pipe and the third pipe are connected, and the connection point is called the third node. The third node is located between the buffer tank and the closed end of the first pipe.

2. The high-concentration hydrogen peroxide dispensing system according to claim 1, characterized in that, The purge pipeline is provided with a pressure reducing valve (3), a gas filter (4), a first air control valve (20) and a one-way valve (6) in sequence after the purge gas source (25).

3. The high-concentration hydrogen peroxide dispensing system according to claim 1, characterized in that, The closed end of the first pipe is equipped with a first temperature sensor (7) and a first pressure sensor (8).

4. The high-concentration hydrogen peroxide dispensing system according to claim 1, characterized in that, A second pneumatic control valve (19) is provided on the first pipeline between the hydrogen peroxide source and the first node, and a third pneumatic control valve (12) is provided between the first node and the cleaning liquid source (22).

5. The high-concentration hydrogen peroxide dispensing system according to claim 1, characterized in that, A fourth pneumatic control valve (11) is provided on the third pipeline between the peristaltic pump (1) and the cleaning liquid source (22), a fifth pneumatic control valve (13) is provided between the peristaltic pump (1) and the transfer port (23), a sixth pneumatic control valve (14) is provided between the peristaltic pump (1) and the first drain port (24), and a seventh pneumatic control valve (15) and a manual shut-off valve (21) are provided sequentially between the peristaltic pump (1) and the gas-liquid storage tank (26).

6. The high-concentration hydrogen peroxide dispensing system according to claim 5, characterized in that, A second temperature sensor (10) is provided between the first node and the seventh pneumatic control valve (15), a second pressure sensor (9) is provided at the second node, and a liquid filter (5) is provided between the second node and the manual shut-off valve (21).

7. The high-concentration hydrogen peroxide dispensing system according to claim 6, characterized in that, An eighth pneumatic control valve (17) is provided between the manual shut-off valve (21) and the gas-liquid storage tank (26), and a ninth pneumatic control valve (18) and a second drain outlet (27) are provided sequentially between the manual shut-off valve (21) and the eighth pneumatic control valve (17).

8. A method for dispensing high-concentration hydrogen peroxide, using the high-concentration hydrogen peroxide dispensing system described in any one of claims 1 to 7, characterized in that, include: Cleaning liquid is injected from the cleaning liquid source (22) to clean the third pipe, the second pipe and the transfer port (23) in sequence; The purging gas source (25) is connected from the purging pipeline inlet, and the purging pipeline, the third pipeline after the second node, the second pipeline after the first node, and the transfer port (23) are purged in sequence. Vacuum pump (2) is used to evacuate the first pipe, the third pipe between the first pipe and the gas-liquid storage tank (26); Hydrogen peroxide is transferred from the hydrogen peroxide source to the transfer tank connected to the transfer port (23) via the second pipeline and peristaltic pump (1); The hydrogen peroxide in the transfer tank is squeezed into the gas-liquid storage tank (26) through the third pipeline by the vacuum pump (2), and then hydrogen peroxide is added from the hydrogen peroxide source to the gas-liquid storage tank (26) through the third pipeline by the peristaltic pump (1) until the addition is completed.

9. The method for adding high-concentration hydrogen peroxide according to claim 8, characterized in that, After the refueling is completed, the following is also included: Set the plant to stand for a preset time, and monitor the pressure of the added hydrogen peroxide during the settling process.

10. The method for adding high-concentration hydrogen peroxide according to claim 9, characterized in that, After the settling period, the following is also included: The purging pipes, the first pipe, the second pipe, and the third pipe are cleaned and purged.

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