CN109737303B - Liquid oxygen system - Google Patents
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- CN109737303B CN109737303B CN201811592166.1A CN201811592166A CN109737303B CN 109737303 B CN109737303 B CN 109737303B CN 201811592166 A CN201811592166 A CN 201811592166A CN 109737303 B CN109737303 B CN 109737303B
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Abstract
The invention provides a liquid oxygen supply system, which has the characteristics of flexibility, adjustable flow, stable supply and the like, and can meet the requirements of cross use among a plurality of test beds; this liquid oxygen system includes: the liquid oxygen supply system is used for adjusting the flow of the supplied liquid oxygen and providing liquid oxygen meeting the working condition requirement for a test piece, and the output flow of the liquid oxygen supply system is adjustable and comprises fixed point flow adjustment and continuous flow adjustment; the process gas regulating system is used for providing valve control gas meeting set requirements for the liquid oxygen regulating system, and simultaneously providing gas for blowing gas of the liquid oxygen pipeline and pressurizing gas for the liquid oxygen storage tank.
Description
Technical Field
The invention relates to an oxygen supply system, in particular to an oxygen supply system.
Background
In the prior art, a liquid oxygen supply system has a complex structure, heavy equipment and large volume, and is inconvenient to move; and the output flow is single, and dynamic flow regulation can not be carried out according to the requirements, so that the use is not flexible.
Disclosure of Invention
In view of this, the present invention provides a liquid oxygen supply system, which has the characteristics of flexibility, adjustable flow rate, stable supply, etc.
The liquid oxygen system includes: a liquid oxygen regulating system and a process air regulating system;
the liquid oxygen regulating system includes: the system comprises a liquid oxygen storage tank, a liquid oxygen filling/precooling unit and a liquid oxygen adjusting unit; the liquid oxygen filling/precooling unit comprises a liquid oxygen filling pipeline and a liquid oxygen supply pipeline, one end of the liquid oxygen supply pipeline is communicated with the liquid oxygen storage tank, and the other end of the liquid oxygen supply pipeline is connected with the liquid oxygen regulating unit; the liquid oxygen supply pipeline is provided with a liquid oxygen supply main valve and a filter; precooling a subsequent pipeline and outputting liquid oxygen through the liquid oxygen supply pipeline; one end of the liquid oxygen filling pipeline is connected with an external liquid oxygen source, and the other end of the liquid oxygen filling pipeline is communicated with the liquid oxygen storage tank and is used for filling liquid oxygen into the liquid oxygen storage tank; the main liquid oxygen supply valve is a pneumatic valve;
the liquid oxygen regulating unit is used for regulating the flow of the liquid oxygen output by the liquid oxygen supply pipeline, and comprises: a flow regulating unit A and a flow regulating unit B; the output of the liquid oxygen supply pipeline is divided into two paths which respectively correspond to the input of the flow regulating unit A and the input of the flow regulating unit B; the flow regulating unit A comprises three cavitation pipe flow regulating branches A which are connected in parallel; the flow regulating unit B comprises three parallel branches, namely two cavitation pipe flow regulating branches B and a regulating valve flow regulating branch; each cavitation pipe flow adjusting branch A and each cavitation pipe flow adjusting branch B are connected with a cavitation pipe and an adjusting valve in series; the flow regulating valve regulating branch is provided with a regulating valve; the regulating valves are all pneumatic valves;
the output ends of the flow regulating unit A and the flow regulating unit B are the output ends of the liquid oxygen supply system;
the process gas regulating system adopts nitrogen as process gas, and is used for providing valve control gas for each pneumatic valve in the liquid oxygen regulating system, providing pressurized gas for a liquid oxygen storage tank in the liquid oxygen regulating system and providing pipeline blowing gas for a liquid oxygen supply pipeline in the liquid oxygen regulating system.
The process gas conditioning system comprises: the method comprises the following steps: the device comprises a nitrogen source, a valve control gas unit, a pressurizing gas unit and a pipeline blowing and degassing unit;
the valve control gas unit is used for providing valve control gas for each pneumatic valve, and the valve control gas unit comprises: the gas source valve A, the primary pressure reducing valve, the gas distributor and the secondary pressure reducing valve; the nitrogen source is connected with the gas distributor through a pipeline which is sequentially provided with a gas source valve and a first-level pressure reducing valve, and the nitrogen source is divided into three paths through the gas distributor: one path of the air is output through a pipeline provided with a secondary pressure reducing valve to provide control air for a pressure reducing valve in a pressure increasing air unit; one path provides valve control gas for each pneumatic valve in the liquid oxygen regulating system; one path of the gas pipe is connected with a pipeline provided with a gas release valve and used for discharging gas;
the pressurization gas unit is used for the pressurization of liquid oxygen storage tank, includes: the device comprises a pressurization pipeline, an air source valve B, a pressure reducing valve and a pressurization valve group; the nitrogen source is connected with the liquid oxygen storage tank through a pressurization pipeline which is sequentially provided with a gas source valve B, a pressure reducing valve and a pressurization valve group; the pressure-increasing valve group comprises two branches connected in parallel, so that gas after being decompressed by the pressure-reducing valve is divided into two paths through the pressure-increasing valve group: one branch is provided with a pore plate and an electromagnetic valve A, and the other branch is provided with an electromagnetic valve B; the branch where the electromagnetic valve B is located is used for carrying out rough pressurization on the liquid oxygen storage tank, and after the pressure is increased to a set value, the pressure difference is corrected through the branch provided with the pore plate and the electromagnetic valve A, so that the pressure of the liquid oxygen storage tank is consistent with a preset pressure value;
the pipeline blows the degasification unit and is used for providing the pipeline for liquid oxygen supply line and blows the degasification, the nitrogen gas source through be provided with air supply valve C, blow degasification relief pressure valve and solenoid valve C blow the degasification pipeline with liquid oxygen supply line's input links to each other, solenoid valve C is used for blow off the break-make of gas pipeline.
In the liquid oxygen regulating system, liquid oxygen for filling and precooling in a liquid oxygen filling/precooling unit is provided by a liquid oxygen source of a test bed; the liquid oxygen supply pipeline and the liquid oxygen filling pipeline are both connected with a liquid oxygen source of the test bed through a pipeline provided with a pneumatic valve A; when the liquid oxygen storage tank needs to be filled, the pneumatic valve A, the liquid oxygen supply main valve and the liquid oxygen storage tank deflation valve are opened, and the liquid oxygen storage tank is filled; when the liquid oxygen supply pipeline needs to be precooled, the pneumatic valve A is opened, the liquid oxygen supply main valve is closed, and liquid oxygen for precooling is supplied by a liquid oxygen source of the test bed.
Has the advantages that:
(1) the liquid oxygen supply system adopts a miniaturized and modularized design and comprises an independent process gas adjusting and conveying system, a liquid oxygen source storage device and a liquid oxygen adjusting device; for the miniaturization of satisfying system corollary equipment, save equipment fixing space, the system of being convenient for removes, has reduced the effective volume of liquid oxygen storage tank, simultaneously for guaranteeing the demand of system work to liquid oxygen consumption, system precooling liquid oxygen consumption is provided by conventional system from taking the storage tank and is changed into by the test bench liquid oxygen storage tank and supply, and the system only provides the test piece test liquid oxygen consumption from taking the storage tank to the volume of system corollary liquid oxygen storage tank has been reduced by a wide margin.
(2) The liquid oxygen supply system has adjustable output flow, comprises fixed point flow adjustment and continuous flow adjustment, wherein the fixed point flow adjustment adopts a cavitation pipe mode to adjust the flow, in order to meet the requirement of the variable working condition of the system flow, five cavitation pipes are arranged according to the oxygen supply working condition system and are divided into two groups, one group is a small flow supply cavitation pipe group and consists of three cavitation pipe groups with smaller rated flow; one group is a high-flow supply cavitation pipe group, which consists of a cavitation pipe with smaller rated flow and a cavitation pipe with larger rated flow, and the inlet of each cavitation pipe is provided with a working condition selection pneumatic valve for carrying out flow matching on different cavitation pipes, and the aim of dynamically adjusting the liquid oxygen flow is achieved by adjusting the combination of different cavitation pipes during working; meanwhile, the factor of the opening time of the valve is considered, in order to ensure that the flow does not have the flow cutoff condition in the dynamic adjustment process, the flow adjustment adopts a step-increasing mode, and the liquid oxygen flow is ensured to be increased gradually, so that the aim of stably supplying the liquid oxygen flow is fulfilled.
(3) The liquid oxygen supply system can realize the small-flow remote delivery of liquid oxygen, and because the small-flow liquid oxygen medium is easy to exchange heat with the outside in the remote delivery process, the delivered liquid oxygen is vaporized and the oxygen supply requirement of the system cannot be met; and on the other hand, an insulating layer is arranged on a pipeline in the system, and a material with a small thermal insulation coefficient, such as polyurethane, is adopted as the material of the insulating layer.
Drawings
FIG. 1 is a system block diagram of the oxygen supply system;
FIG. 2 is a schematic view of a valve control gas unit;
FIG. 3 is a schematic view of a charge air unit;
FIG. 4 is a schematic view of a line purge gas unit;
FIG. 5 is a schematic view of a liquid oxygen filling/pre-cooling unit;
FIG. 6 is a schematic view of a liquid oxygen regulating unit.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The embodiment provides a liquid oxygen system for the test piece provides the liquid oxygen medium that satisfies experimental operating mode requirement, have characteristics such as flexible, the flow is adjustable, supply with stably.
As shown in fig. 1, the liquid oxygen supply system includes: a nitrogen process gas regulating system, a liquid oxygen regulating system and a tail end valve system.
Nitrogen process gas regulating system
The liquid oxygen supply system adopts nitrogen as the process gas, the nitrogen process gas regulating system is used for providing valve control gas meeting the set requirement for the liquid oxygen regulating system, simultaneously provides gas for blowing the liquid oxygen pipeline and pressurizing the liquid oxygen storage tank, and can achieve the purpose of regulating the process gas by regulating the outlet pressure of the reducing valves at different parts of the nitrogen process gas regulating system. The nitrogen process gas source is provided by the test beds, and the pressure of the nitrogen process gas source of the process gas is required to be not lower than 15MPa according to the nitrogen process gas supply capacity of each test bed.
Specifically, the nitrogen process gas conditioning system comprises: the valve control gas unit, the pressurization gas unit and the pipeline blowing and degassing unit are supplied with gas through a nitrogen source.
Wherein the valve control gas unit is used for supplying control gas for remotely controlling the pneumatic stop valve and the storage tank pressurization and decompression valve, as shown in fig. 2, the valve control gas unit comprises: air supply valve DF2, primary pressure reducing valve J1, air distributor, secondary pressure reducing valve J4 and solenoid valve set CF1-CF 18. The nitrogen source of the test bed is connected with the gas distributor through a pipeline which is sequentially provided with a gas source valve DF2 and a first-level pressure reducing valve J1, the pressure of the nitrogen source is reduced to 5MP through the first-level pressure reducing valve J1, and then the nitrogen source is divided into three paths through the gas distributor: one path of the air is output through a pipeline provided with a secondary pressure reducing valve J4, and the air is reduced to 0.7MPa through a secondary pressure reducing valve J4 and then is used as pressure reducing valve control air; one path of the pneumatic stop valve is used as valve control gas of the pneumatic stop valve and is used for controlling the opening and closing of the pneumatic stop valve, and each pneumatic stop valve is controlled to be closed through two electromagnetic valves; and the other path is connected with a pipeline provided with a deflation valve DF3 for safe gas discharge.
The pressurization gas unit is used for the pressurization of the liquid oxygen storage tank, and as shown in fig. 3, comprises: an air supply valve DF4, a remote control pressure reducing valve J2 and a two-way pressure increasing valve group. The pressure reducing valve control gas output by the valve control gas unit is used as the driving gas of the remote control pressure reducing valve J2 and is used for driving the remote control pressure reducing valve J2 to work; the nitrogen source supplies air to a remote control pressure reducing valve J2 through a pipeline provided with an air source valve DF 4; the nitrogen source is used as working medium gas, is decompressed by a remote control pressure reducing valve J2 and then enters a pressurizing valve group to pressurize the storage tank; the pressure-increasing valve group has two paths, so that after the pressure is reduced by the driving remote control pressure-reducing valve J2, the gas is divided into two paths through the gas distributor: one of the pipelines is provided with a pore plate and an electromagnetic valve CF21, the other pipeline is provided with an electromagnetic valve CF22, and the pore plate is used for limiting flow to ensure stable flow. When in work: the pressure is roughly increased through a pipeline provided with a solenoid valve CF22, and the pressure difference is corrected through a pipeline provided with a pore plate and a solenoid valve CF21 after the pressure is increased to a set value. Gas after the pressure boost valves increase is converged through the gas mixer and then is output to the liquid oxygen storage tank, and the liquid oxygen storage tank is pressurized.
In order to guarantee that the liquid oxygen storage tank is stably pressurized, the liquid oxygen storage tank is subjected to step pressurization by utilizing a pressurization valve group in a low-pressure precooling stage and a high-pressure precooling stage before test, and the liquid oxygen storage tank is directly pressurized by the outlet pressure of a remote control pressure reducing valve J2 during test, so that the liquid oxygen flow is controlled, and the purpose of the oxygen supplementation working condition requirement is met.
The pipeline blows the degasification unit and is used for providing the blowing degasification of pipeline for oxygen system, blows off the remaining liquid oxygen in the pipeline totally, guarantees oxygen system's safety, has the airtight effect of suppressing of oxygen system simultaneously concurrently. As shown in fig. 4, the line blow-off unit includes: the device comprises an air source valve DF6, a blowing and degassing pressure reducing valve J3, a main pipeline blowing and degassing branch and an oxygenating pipeline degassing branch. The nitrogen source is divided into two branches through a gas distributor after passing through a pipeline which is sequentially provided with a gas source valve DF6 and a blowing and degassing pressure reducing valve J3, the two branches are respectively a main pipeline blowing and degassing branch and an oxygenating pipeline degassing branch, each branch is provided with an electromagnetic valve for opening and closing the branch, the main pipeline blowing and degassing branch is provided with an electromagnetic valve CF33, the branch is used for providing main pipeline blowing and degassing, and a nitrogen blowing port of the branch is arranged behind a liquid oxygen main cut-off valve QF1 and is used for blowing and degassing of the liquid oxygen main pipeline and airtight pressurization of a system; the oxygen supplementing pipeline degassing branch is output in two paths, and the two nitrogen blowing ports are respectively arranged behind the oxygen supply valve QF11 and the oxygen supply valve QF10 and are mainly used for blowing the test piece cavity and the oxygen supplementing pipeline after the test. During operation, nitrogen is decompressed through the blowing and degassing decompression valve J3 and then is conveyed to the two branches, and the electromagnetic valves on the corresponding branches are opened according to the test flow during operation, so that the system is blown.
(II) liquid oxygen regulating system
The liquid oxygen regulating system is used for regulating the flow of the supplied liquid oxygen and providing the liquid oxygen meeting the working condition requirement for the test piece. The liquid oxygen regulating system includes: a liquid oxygen filling/precooling unit, a liquid oxygen source and a liquid oxygen regulating unit. Considering that the liquid oxygen consumption of the oxygen supply system is mainly the oxygen consumption of low-pressure precooling, in order to effectively reduce the volume of the liquid oxygen storage tank (liquid oxygen source) of the oxygen supply system and effectively utilize the experimental energy, the liquid oxygen required by the liquid oxygen filling and low-pressure precooling of the high-pressure liquid oxygen storage tank of the oxygen supply system is provided by the test bed.
The liquid oxygen source is a supply source of liquid oxygen in the test process, in this embodiment, the liquid oxygen source is provided by a liquid oxygen storage tank, the liquid oxygen storage tank adopts a 300L, 20MPa high-pressure low-temperature storage tank, and the effective storage amount of the liquid oxygen is 225L. The top of the liquid oxygen storage tank is provided with a safety valve and an air release valve, the liquid oxygen liquid level in the liquid oxygen storage tank is monitored in real time through a liquid level meter, and the liquid level meter outputs a 0-5V voltage signal by adopting a differential pressure type capacitance liquid level meter and is used for remote monitoring of the liquid oxygen liquid level. The liquid oxygen required for filling the liquid oxygen storage tank is provided by the test bed.
The liquid oxygen filling/precooling unit is used for providing liquid oxygen for low-pressure precooling of the liquid oxygen supply pipeline and liquid oxygen filling of the liquid oxygen storage tank. As shown in fig. 5, the liquid oxygen fill/fill pre-cooling unit includes: the liquid oxygen supply pipeline provided with the filter is connected with a main pipeline of a liquid oxygen supply system of the test bed through a pipeline provided with a pneumatic valve QF2, and is communicated with a liquid oxygen storage tank through a pipeline provided with a pneumatic valve QF 1; opening the pneumatic valve QF2, precooling the subsequent pipeline through a liquid oxygen source, and opening the pneumatic valve QF1 after precooling to supply oxygen through liquid oxygen in the liquid oxygen tank; the pneumatic valve QF1 is a main liquid oxygen supply valve; the liquid oxygen filling pipe provided with the pneumatic valve QF2 is communicated with the liquid oxygen storage tank through a liquid oxygen supply main valve, and the work of low-pressure precooling and storage tank filling is realized by means of a liquid oxygen source of the test bed. The pneumatic valve QF14 is a pressure relief valve of the liquid oxygen storage tank, the pneumatic valve QF13 is a gas relief valve of the liquid oxygen storage tank, and the pneumatic valve QF14 is connected with the discharge port through a pipeline. During operation, a liquid oxygen supply main valve QF1 and a liquid oxygen storage tank deflation valve QF13 are opened to fill the liquid oxygen storage tank; and then carrying out low-pressure precooling on the mobile oxygen supply system.
The liquid oxygen regulating unit is used for regulating and measuring the flow of the liquid oxygen, and the liquid oxygen regulating unit can enable the oxygen supply system to output liquid oxygen with different flows. In this embodiment, two liquid oxygen supply pipelines are arranged according to design requirements, and because the two liquid oxygen supply pipelines have different flow rates, flow rate adjusting units are respectively arranged corresponding to the two liquid oxygen supply pipelines. According to the test requirement, because the liquid oxygen supply flow range is large, the working requirement of working condition conversion in the test process exists, the difficulty of realizing multi-working condition flow regulation on the same source single cavitation pipe is large, and therefore the oxygen supply system adopts a mode of combining a plurality of cavitation pipes. As shown in fig. 6, the output end of the liquid oxygen supply pipe is connected to the input end of the liquid oxygen regulating unit, the liquid oxygen regulating unit is divided into two paths, which are respectively a flow regulating unit a and a flow regulating unit B, the flow regulating unit a includes a gas distributor, a gas mixer, three cavitation pipe flow regulating branches and a pre-cooling branch, one path of output of the liquid oxygen supply pipe is divided into four parallel branches by the gas distributor, the four branches are respectively three cavitation pipe flow regulating branches and one pre-cooling branch, and the four branches are output after being converged by the gas mixer. Each flow regulating branch of the cavitation pipe is connected in series with the cavitation pipe and the flow regulating valve, the specifications of the cavitation pipes on the three flow regulating branches of the cavitation pipe are the same, and the rated flow is 0.1 kg/s. The cavitation pipe group mainly uses the oxygen supplement requirement of fixed point and dynamic regulation working condition in the test process, and the flow regulating valve is mainly used for continuous free dynamic regulation. The flow regulating unit B comprises a gas distributor, a gas mixer, two flow regulating branches and a flow regulating valve path, the other output of the liquid oxygen supply pipe is divided into three branches connected in parallel through the gas distributor, the three branches are respectively two cavitation pipe flow regulating branches (the rated flow of one cavitation pipe is 0.1kg/s, the rated flow of one cavitation pipe is 0.4kg/s) and one flow regulating valve regulating branch, and the three branches are converged through the gas mixer and then output. Each flow regulating branch of the cavitation pipe is connected in series with a cavitation pipe (throttled by a cavitation pipe throat to generate stable flow) and a flow regulating valve, the flow regulating valve is provided with a regulating valve on the branch, and two ends of the regulating valve are respectively provided with a stop valve to ensure reliability. The cavitation pipe flow adjusting branch is used for meeting the fixed point flow adjusting function and realizing the stepped flow adjustment; the flow regulating valve regulating branch is a continuous flow regulating branch and is used for meeting the function of free continuous flow regulation. The flow regulating valves are remote control pneumatic valves, the remote control pneumatic valves in front of the cavitation pipes are switched during working, and the supply requirements of liquid oxygen with different flow rates are met through matching and combination of different cavitation pipe groups. And meanwhile, the front end of each flow regulating unit is provided with a flowmeter for collecting the flow of liquid oxygen in the oxygen supply process.
The flow regulation working conditions of the liquid oxygen regulation unit are five, wherein the flow regulation unit A has three working conditions, the flow regulation unit B has two working conditions, the fixed-point working condition regulation adopts the mode of a cavitation pipe group, and the requirements of different oxygen supplement flow rates are met through different matching of cavitation pipes.
The flow regulation is divided into a dynamic flow regulation mode and a free continuous flow regulation (continuous mode), wherein the dynamic flow regulation adopts a flow step increase mode, the first process comprises three working condition points according to the requirements of the dynamic regulation working condition points, the flow regulation unit B is closed in the test process, the remote control pneumatic valves at the front ends of three flow regulation branches in the flow regulation unit A are sequentially opened, the oxygen supply flow is sequentially increased from 0.1kg/s, and the conversion of the three working conditions is completed; the process II comprises two working condition points, the flow regulating unit A is closed in the test process, the remote control pneumatic valves at the front ends of the two flow regulating branches in the flow regulating unit B are sequentially opened, the oxygen supply flow is increased from 0.4kg/s to 0.6kg/s, and the conversion of the two working conditions is completed; the third process comprises three working condition points, and the remote control pneumatic valves at the front ends of the corresponding flow regulating branches are respectively opened according to time sequences, so that the working condition replacement is realized, and the third process specifically comprises the following steps: when the working condition point is 1, the flow regulating unit B is closed, and the remote control pneumatic valves at the front ends of the two flow regulating branches in the flow regulating unit A are opened; when the working condition point 2 is reached, the state of the flow regulating unit A is unchanged, and a remote control pneumatic valve at the front end of one flow regulating branch in the flow regulating unit B is opened; at the working condition point 2, the remote control pneumatic valves at the front ends of the remaining flow regulating branches in the flow regulating unit A and the flow regulating unit B are opened simultaneously, so that the conversion of three working conditions is completed; the corresponding operating regime transitions are shown in table 1.
TABLE 1 STEP-TYPE MATCHING TABLE FOR DYNAMIC FLOW REGULATION CONDITION
The flow regulating unit B has a free continuous dynamic flow regulating function, and a flow regulating valve regulating branch is arranged in the flow regulating unit B and adopts a flow regulating valve to realize the free continuous dynamic flow regulating function in consideration of the fact that a cavitation pipe group cannot meet the technical requirement of continuous working condition regulation. In order to solve the problems of long response time and large flow fluctuation of the flow regulating valve, the flow regulating valve adopts an open-loop control mode, the full opening and closing time of the valve is less than 1s, the response time of the valve can be effectively shortened, the valve performance is debugged in the early stage, a valve flow characteristic curve is fitted, and the valve opening degree is reasonably set according to the valve performance curve, so that the purpose of flow regulation is achieved.
(III) end valve system
The tail end valve system mainly takes the tasks of liquid oxygen supply in the test process and liquid oxygen pipeline blowing-off after the test. And the tail end valve system is arranged near a tail end supply object of the oxygen supply system and is used for controlling the on-off of oxygen supply in the test process and the on-off of the blowing pipeline after the test. In order to ensure that the liquid oxygen supply pipeline can be sufficiently cooled before the test and ensure the stable supply of the liquid oxygen, the tail end valve system is close to the oxygen supply test piece as much as possible.
The liquid oxygen supply system builds control system hardware through the PLC, completes valve switch and flow regulation control of the oxygen supply system through the PLC, collects corresponding measuring point signals of pressure, temperature, flow and the like, and completes system control and data monitoring and collection work. The control system is used as a set of visual human-computer interaction upper interface for application in debugging and testing. Each measuring point of the system uses a pressure sensor, a temperature sensor and a flow sensor which can be applied to a low-temperature system, signals are collected and stored by PLC hardware, and stored data can be called and post-processed by an upper computer. The related valves of the system can use position feedback signals for the system to identify the actual positions of the valves, switch the valves to set the switch signals fed back by opening and closing in place, and adjust the valves to set specific position signals, and the signals are collected and processed by the PLC.
And in the test preparation stage, the process gas regulation, the pipeline blowing and the low-pressure precooling are debugged according to remote manual control. The software of the upper computer is communicated with the integrated controller in the test process, the integrated controller issues storage tank pressurization, oxygen supplement and emergency stop instructions, the oxygen supply system receives the instructions, and the whole process automatically completes the processes of high-pressure precooling, oxygen supplement and emergency stop. And after the test is finished, blowing off and resetting the process gas after the test is remotely and manually controlled.
Considering the reliability of the liquid oxygen supply system measurement and control system, in the system preparation and participation processes, only the storage tank pressurization and oxygen supply units adopt an automatic control mode, and the other operation units all adopt a manual control mode.
Pressurizing the storage tank: on the basis of low-pressure precooling in place of the system, an oxygen supply instruction controlled by a test bed is received, and the storage tank pressurization is started, wherein the storage tank pressurization is automatically controlled in the whole process.
During work, firstly adjusting a nitrogen process gas adjusting system, preparing a liquid oxygen adjusting system after the process gas is prepared, firstly, starting precooling of the liquid oxygen adjusting system, completing precooling work of the system after the precooling temperature of the system meets the use requirement, then, pressurizing a liquid oxygen storage tank through a pressurizing process gas pipeline, and completing preparation of the liquid oxygen system after the pressure of the storage tank reaches a target value; according to different working condition requirements, the flow regulation of the liquid oxygen regulation system mainly adopts two modes, one mode is a flow regulation mode of a cavitation pipe group, the single-point variable working condition oxygen supply flow regulation is realized through cavitation pipes with different specifications, and the other mode is a flow regulation valve regulation mode, and the continuous variable working condition oxygen supply flow regulation can be realized.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A liquid oxygen supply system, comprising: a liquid oxygen regulating system and a process air regulating system;
the liquid oxygen regulating system includes: the system comprises a liquid oxygen storage tank, a liquid oxygen filling/precooling unit and a liquid oxygen adjusting unit; the liquid oxygen filling/precooling unit comprises a liquid oxygen filling pipeline and a liquid oxygen supply pipeline, one end of the liquid oxygen supply pipeline is communicated with the liquid oxygen storage tank, and the other end of the liquid oxygen supply pipeline is connected with the liquid oxygen regulating unit; the liquid oxygen supply pipeline is provided with a liquid oxygen supply main valve and a filter; precooling a subsequent pipeline and outputting liquid oxygen through the liquid oxygen supply pipeline; one end of the liquid oxygen filling pipeline is connected with an external liquid oxygen source, and the other end of the liquid oxygen filling pipeline is communicated with the liquid oxygen storage tank and is used for filling liquid oxygen into the liquid oxygen storage tank; the main liquid oxygen supply valve is a pneumatic valve;
the liquid oxygen regulating unit is used for regulating the flow of the liquid oxygen output by the liquid oxygen supply pipeline, and comprises: a flow regulating unit A and a flow regulating unit B; the output of the liquid oxygen supply pipeline is divided into two paths which respectively correspond to the input of the flow regulating unit A and the input of the flow regulating unit B; the flow regulating unit A comprises three cavitation pipe flow regulating branches A which are connected in parallel; the flow regulating unit B comprises three parallel branches, namely two cavitation pipe flow regulating branches B and a flow regulating valve regulating branch; each cavitation pipe flow adjusting branch A and each cavitation pipe flow adjusting branch B are connected with a cavitation pipe and an adjusting valve in series; the flow regulating valve regulating branch is provided with a regulating valve; the regulating valves are all pneumatic valves;
the output ends of the flow regulating unit A and the flow regulating unit B are the output ends of the liquid oxygen supply system;
the process gas regulating system adopts nitrogen as process gas, and is used for providing valve control gas for each pneumatic valve in the liquid oxygen regulating system, providing pressurized gas for a liquid oxygen storage tank in the liquid oxygen regulating system and providing pipeline blowing gas for a liquid oxygen supply pipeline in the liquid oxygen regulating system;
the process gas conditioning system comprises: the device comprises a nitrogen source, a valve control gas unit, a pressurizing gas unit and a pipeline blowing and degassing unit;
the valve control gas unit is used for providing valve control gas for each pneumatic valve, and the valve control gas unit comprises: the gas source valve A, the primary pressure reducing valve, the gas distributor and the secondary pressure reducing valve; the nitrogen source is connected with the gas distributor through a pipeline which is sequentially provided with a gas source valve A and a first-level pressure reducing valve, and the nitrogen source is divided into three paths through the gas distributor: one path of the air is output through a pipeline provided with a secondary pressure reducing valve to provide control air for a pressure reducing valve in a pressure increasing air unit; one path provides valve control gas for each pneumatic valve in the liquid oxygen regulating system; one path of the gas pipe is connected with a pipeline provided with a gas release valve and used for discharging gas;
the pressurization gas unit is used for the pressurization of liquid oxygen storage tank, includes: the device comprises a pressurization pipeline, an air source valve B, a pressure reducing valve and a pressurization valve group; the nitrogen source is connected with the liquid oxygen storage tank through a pressurization pipeline which is sequentially provided with a gas source valve B, a pressure reducing valve and a pressurization valve group; the pressure-increasing valve group comprises two branches connected in parallel, so that gas after being decompressed by the pressure-reducing valve is divided into two paths through the pressure-increasing valve group: one branch is provided with a pore plate and an electromagnetic valve A, and the other branch is provided with an electromagnetic valve B; the branch where the electromagnetic valve B is located is used for carrying out rough pressurization on the liquid oxygen storage tank, and after the pressure is increased to a set value, the pressure difference is corrected through the branch provided with the pore plate and the electromagnetic valve A, so that the pressure of the liquid oxygen storage tank is consistent with a preset pressure value;
the pipeline blows the degasification unit and is used for providing the pipeline for liquid oxygen supply line and blows the degasification, the nitrogen gas source through be provided with air supply valve C, blow degasification relief pressure valve and solenoid valve C blow the degasification pipeline with liquid oxygen supply line's input links to each other, solenoid valve C is used for blow off the break-make of gas pipeline.
2. The system of claim 1, wherein in the system, the liquid oxygen for filling and pre-cooling in the liquid oxygen filling/pre-cooling unit is provided by a liquid oxygen source of the test bed; the liquid oxygen supply pipeline and the liquid oxygen filling pipeline are both connected with a liquid oxygen source of the test bed through a pipeline provided with a pneumatic valve A; when the liquid oxygen storage tank needs to be filled, the pneumatic valve A, the liquid oxygen supply main valve and the liquid oxygen storage tank deflation valve are opened to fill the liquid oxygen storage tank; when the liquid oxygen supply pipeline needs to be precooled, the pneumatic valve A is opened, the liquid oxygen supply main valve is closed, and liquid oxygen for precooling is supplied by a liquid oxygen source of the test bed.
3. The liquid oxygen supply system according to claim 1, wherein a pre-cooling branch is provided in the flow regulating unit a, and the pre-cooling branch is connected in parallel with a cavitation pipe flow regulating branch a in the flow regulating unit a; and a pneumatic regulating valve is arranged on the precooling branch.
4. The liquid oxygen supply system according to claim 1, wherein a stop valve is provided at each end of the regulating valve in the flow regulating branch of the flow regulating valve in the flow regulating unit B.
5. The system of claim 1, wherein a flow meter is disposed at each of the input ends of the flow regulating unit a and the flow regulating unit B for collecting the flow of liquid oxygen during oxygen supply.
6. The liquid oxygen supply system according to claim 1, wherein the flow rates of the cavitation pipes in the three cavitation pipe flow regulating branches A are the same, and the flow rates of the cavitation pipes in the two cavitation pipe flow regulating branches B are different, wherein one of the flow rates is the same as the flow rate of the cavitation pipe in the cavitation pipe flow regulating branch A, and the other flow rate is larger than the flow rate of the cavitation pipe in the cavitation pipe flow regulating branch A.
7. The system of claim 1, wherein the liquid oxygen supply line is provided with an insulation layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811592166.1A CN109737303B (en) | 2018-12-25 | 2018-12-25 | Liquid oxygen system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811592166.1A CN109737303B (en) | 2018-12-25 | 2018-12-25 | Liquid oxygen system |
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| CN111720849B (en) * | 2020-06-04 | 2022-10-28 | 西安航天动力试验技术研究所 | Fuel multi-working-condition accurate supply system of fuel gas generator and operation method thereof |
| CN111912169A (en) * | 2020-07-31 | 2020-11-10 | 西安航天动力研究所 | Anti-oxidation heat exchange system prepared by small-flow liquid oxygen in real time and operation method thereof |
| CN112856218B (en) * | 2020-12-25 | 2022-09-23 | 北京动力机械研究所 | Automatic flow control and protection method based on liquid oxygen flow regulation |
| CN113252291B (en) * | 2021-07-15 | 2021-10-08 | 中国空气动力研究与发展中心低速空气动力研究所 | Icing wind tunnel air supply system and method |
| CN114275169A (en) * | 2021-12-28 | 2022-04-05 | 北京动力机械研究所 | Low-boiling-point working medium pressurization supply system and supply method |
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| CN101781156A (en) * | 2009-01-15 | 2010-07-21 | 北京航空航天大学 | Peroxide supplying system and safety operation method |
| KR20130076126A (en) * | 2011-12-28 | 2013-07-08 | 한국가스공사 | Submerged combustion vaporizer with air liquefaction type apparatus supplying pure oxygen |
| CN103244203B (en) * | 2013-05-21 | 2014-12-03 | 国家电网公司 | Throttle valve system and working method thereof |
| US10119756B2 (en) * | 2013-10-23 | 2018-11-06 | Praxair Technology, Inc. | Oxygen backup method and system |
| CN205191224U (en) * | 2015-11-09 | 2016-04-27 | 河南开利空分设备集团有限公司 | Atmospheric pressure liquid oxygen supply system |
| CN107524911B (en) * | 2017-09-18 | 2019-04-23 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | The liquid oxygen of underwater operation platform fills and recovery system |
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