Metal powder combustion test platform with safety guarantee

Abstract

A powder combustion test platform with safety guarantee comprises a powder storage tank, the front portion of the powder storage tank is communicated with a nitrogen gas source through a piston pressure reducing valve, and a fluidization area of the powder storage tank is communicated with the nitrogen gas source through a fluidization pressure reducing valve; the tail end of the fluidization area is connected with a detachable combustion chamber through a throttling hole; a cyclone, a plasma igniter and an atomizer are installed in the combustion chamber, pressure sensors are arranged at a piston pressure reducing valve of the powder storage tank, the fluidization area, the near end of the cyclone in the combustion chamber and the position, close to a pressure release valve, of the rear end of the combustion chamber, and it is guaranteed that the pressure in an experiment container meets the experiment requirement through multi-stage pressure monitoring in cooperation with the rear-end pressure release valve; and by means of the detachable combustion chamber, internal sediments can be cleaned conveniently, and repeatability is good.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of powder combustion test, and specifically relates to a safe powder combustion test platform. BACKGROUND

[0002] As a new type of rocket engine, the powder engine has an advantage in energy density compared with the hydrogen-oxygen fuel engine and the solid fuel engine, and the oxidizer is relatively easy to obtain, so the powder engine has application prospects in underwater navigation devices and space exploration related power systems. However, due to the particularity of the reactants and the low combustion efficiency, the powder combustion test causes serious environmental pollution, the leaked powder is harmful to the human body, and the open exposure experiment causes serious health hazards to the experimenters. At present, there is no related test system with safety guarantee or closed test device. SUMMARY

[0003] In order to avoid the defects of the prior art, the purpose of the present application is to provide a safe powder combustion test platform, which has a closed test cavity, an adjustable pressure container and a detachable cavity structure, so as to protect the experimenters from the risk of exposure to powder fuel and ensure the effective performance of the test.

[0004] In order to achieve the above purpose, the technical scheme of the present application is as follows: A safe powder combustion test platform, comprising a powder storage tank 2, the front part of the powder storage tank 2 is connected to a nitrogen gas source 5 through a piston pressure reducing valve 3; the piston of the powder storage tank 2 is connected to a displacement sensor 6, and the displacement sensor 6 transmits displacement information to a monitoring and control terminal 1; the piston of the powder storage tank 2 is divided into a storage area and a fluidization area, the fluidization area is connected to the nitrogen gas source 5 through a fluidization pressure reducing valve 4; the end of the fluidization area is connected to a combustion chamber 15 through a throttle hole 9; a cyclone 10, a plasma igniter 14 and an atomizer 16 are installed inside the combustion chamber 15; the signal end of the plasma igniter 14 is connected to the monitoring and control terminal 1 through a plasma controller 12; the atomizer 16 is connected to a water tank 19 through a flow meter 17 and a water pump 18, and the flow meter 17 and the water pump 18 are controlled by the monitoring and control terminal 1; The gas supply position of the piston pressure reducing valve 3 is connected to a first pressure sensor 7; The fluidization area is connected to a second pressure sensor 8; The proximal end of the cyclone 10 inside the combustion chamber 15 is connected to a third pressure sensor 11; The position close to the pressure relief valve 20 at the rear end of the combustion chamber 15 is connected to a fourth pressure sensor 13; The pressure relief valve 20 is controlled by the monitoring and control terminal 1; The first pressure sensor 7, the second pressure sensor 8, the third pressure sensor 11 and the fourth pressure sensor 13 are signal connected to the monitoring and control terminal 1 controlled by the monitoring and control terminal 1.

[0005] The combustion chamber 15 is detachable; the powder tightness during reaction is ensured.

[0006] The nitrogen gas source 5 and the pushing of the piston by the piston pressure reducing valve 3 can be replaced by a precision motor, that is, the piston is pushed by the precision motor according to the preset powder flow to supply powder.

[0007] The third pressure sensor 11 and the fourth pressure sensor 13 reduce the fluctuation of the pressure detection of the large-volume container through double-parameter cooperation; at the same time, the third pressure sensor 11 has the function of monitoring the inlet pressure of the cyclone 10.

[0008] The pressure relief valve 20 is internally provided with a filter screen.

[0009] Compared with the prior art, the beneficial effects of the present application are: 1. The present application accurately monitors the pressure coordination of the driving, fluidization, injection and combustion areas through the setting of four pressure sensors, ensures the pressure coordination and dynamic balance of the whole system, and realizes stable piston displacement and powder supply.

[0010] 2. The present application realizes the adjustment of the pressure inside the combustion chamber 15 through the design of the pressure relief valve; cooperating with the fourth pressure sensor 13, the back pressure of the combustion chamber 15 can be maintained at a stable level during the experiment, so that the controllable and accurate experiment can be carried out.

[0011] 3. The combustion chamber 15 of the present application is detachable, which is convenient for cleaning the deposits and incomplete combustion powder of powder combustion, ensures the cleanliness of the experimental equipment under the premise of realizing the closed powder experiment, and avoids the interference error between different experiments.

[0012] In summary, the present application considers the harm of the open experimental environment to the experimenters and the environment in the powder combustion experiment, eliminates the leakage of powder and products by adopting the closed experimental container, and ensures the safety of the experiment. At the same time, through multi-stage pressure monitoring, cooperating with the rear pressure relief valve, the pressure inside the test container is ensured to meet the experimental requirements. The detachable combustion chamber realizes the convenient cleaning of the internal deposits and has good repeatability. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is the system principle diagram of the present application.

[0014] Figure: 1-monitoring and control terminal, 2-powder storage tank, 3-piston pressure reducing valve, 4-fluidized pressure reducing valve, 5-nitrogen gas source, 6-displacement sensor, 7-first pressure sensor, 8-second pressure sensor, 9-throttle hole, 10-cyclone, 11-third pressure sensor, 12-plasma controller, 13-fourth pressure sensor, 14-plasma igniter, 15-combustion chamber, 16-atomizer, 17-flow meter, 18-water pump, 19-water tank, 20-pressure relief valve. DETAILED DESCRIPTION

[0015] The application will be further described in detail below in combination with the drawings and specific embodiments.

[0016] See the accompanying Figure 1 , the application is a safety powder combustion test platform, the system includes monitoring and control terminal 1, powder storage tank 2, piston pressure reducing valve 3, fluidized pressure reducing valve 4, nitrogen gas source 5, displacement sensor 6, first pressure sensor 7, second pressure sensor 8, throttle hole 9, cyclone 10, third pressure sensor 11, plasma controller 12, fourth pressure sensor 13, plasma igniter 14, combustion chamber 15, atomizer 16, flow meter 17, water pump 18, water tank 19, pressure relief valve 20.

[0017] Among them, the front of the powder storage tank 2 is communicated with the nitrogen gas source 5 through the piston pressure reducing valve 3, which pushes the piston to supply powder to the fluidized zone; the piston of the powder storage tank 2 is connected with the displacement sensor 6, which transmits the displacement information to the monitoring and control terminal 1 for calculating and controlling the powder flow; the piston of the powder storage tank 2 is divided into a storage zone and a fluidized zone, the fluidized zone is communicated with the nitrogen gas source 5 through the fluidized pressure reducing valve 4, and the nitrogen gas is used as the fluidized gas to transport the powder fuel; the end of the fluidized zone is connected with the combustion chamber 15 through the throttle hole 9, which ensures the stable and controllable flow; the cyclone 10, the plasma igniter 14 and the atomizer 16 are installed inside the combustion chamber 15, the cyclone 10 diffuses the powder fuel into the combustion chamber 15, which is convenient for ignition and combustion; the signal end of the plasma igniter 14 is connected with the monitoring and control terminal 1 through the plasma controller 12, the plasma controller 12 gives the ignition instruction according to the fuel powder injection condition, and controls the plasma igniter 14 to excite ignition; the atomizer 16 is connected to the water tank 19 through the flow meter 17 and the water pump 18, the flow meter 17 and the water pump 18 are controlled by the monitoring and control terminal 1, the flow meter 17 monitors the flow of the water pump 18, the monitoring and control terminal 1 adjusts the power of the water pump 18 according to the flow, and controls the flow from the water tank 19 to the atomizer 16; the atomizer 16 sprays water mist into the combustion chamber 15, which is convenient for subsequent combustion reaction.

[0018] The gas supply position of the piston pressure reducing valve 3 is connected with the first pressure sensor 7, which monitors the piston powder supply pressure. The fluidization zone is connected with a second pressure sensor 8 for monitoring fluidization pressure. The third pressure sensor 11 is connected with the swirl generator 10 near the front end of the combustion chamber 15 for monitoring the pressure of the injection outlet. The fourth pressure sensor 13 is connected with the combustion chamber 15 near the position of the pressure relief valve 20 at the rear end for monitoring the overall pressure of the combustion chamber 15 synchronously with the third pressure sensor 11. The pressure relief valve 20 is controlled by the monitoring and control terminal 1, and the pressure relief time and amplitude are adjusted according to the monitored pressure data of the combustion chamber 15 to ensure that the pressure in the combustion chamber 15 meets the test requirements. The first pressure sensor 7, the second pressure sensor 8, the third pressure sensor 11 and the fourth pressure sensor 13 are all signal connected to the monitoring and control terminal 1 for control.

[0019] Specifically, the combustion chamber 15 is detachable, which is convenient for cleaning the deposits of powder combustion and the incomplete combustion powder, and ensures the powder airtightness during the reaction, so that the test powder cannot leak.

[0020] Specifically, the pushing action of the nitrogen gas source 5 and the piston pressure relief valve 3 on the piston can be replaced by a precision motor, that is, the piston is pushed by the precision motor according to the preset powder flow; in this case, the first pressure sensor 7 is not required to be installed.

[0021] Specifically, the third pressure sensor 11 and the fourth pressure sensor 13 reduce the fluctuation of the pressure detection of the large-volume container through double-parameter cooperation, and more pressure sensors can be added to improve the monitoring accuracy; at the same time, the third pressure sensor 11 also has the function of monitoring the inlet pressure of the swirl generator 10, which plays an important role in the powder supply system.

[0022] Specifically, a filter screen is installed in the pressure relief valve 20 to prevent powder and product leakage, or a sealed container is connected externally to collect the leakage.

[0023] The working principle of the present application is as follows: The monitoring and control terminal 1 first sends a start signal to the piston pressure relief valve 3 and the fluidization pressure relief valve 4, the piston pressure relief valve 3 pressurizes the piston at the rear of the powder storage tank 2, the piston pushes the powder to the fluidization zone, the fluidization pressure relief valve 4 supplies gas to the fluidization zone, and the powder is fluidized and transported. The terminal calculates the powder flow according to the piston displacement of the displacement sensor 6 and the cross-sectional area of the powder storage tank 2, and controls the water pump 18 and the flow meter 17 to extract a certain amount of water to achieve the appropriate chemical equivalent ratio of the reactants.

[0024] The powder fuel is throttled by the throttle hole 9, and the gas-solid two-phase choked flow is realized due to the pressure control, so that the flow is stable and controllable. Then, the powder fuel is diffused and injected into the combustion chamber 15 through the cyclone 10. The water pump supplies water, which is atomized and injected into the combustion chamber 15 through the multiple atomizers 16. The multiple injection realizes higher combustion efficiency. The monitoring and control terminal 1 sends a start signal to the plasma igniter 14 through a certain timing control when the reactants are injected for a certain time, so that the plasma igniter 14 is excited to ignite.

[0025] The stable pressure difference before and after the piston is realized according to the monitored pressures of the first pressure sensor 7 and the second pressure sensor 8, so that the piston is stably pushed forward. The stable pressure difference between the fluidization zone and the combustion chamber 15 is realized according to the monitored pressures of the second pressure sensor 8 and the third pressure sensor 11, so that the two-phase choked flow and the stable flow are ensured. The pressures of the combustion chamber 15 are monitored according to the third pressure sensor 11 and the fourth pressure sensor 13, and the outside pressure sensor, so that the combustion chamber 15 pressure is released through the opening and closing of the pressure relief valve 20, and the combustion chamber 15 pressure is realized within the experimental range.

[0026] The above description is only the preferred embodiments of the present application, and does not limit the patent range of the present application. Any equivalent structure or equivalent flow transformation, or direct or indirect application in other related technical fields, which is made according to the content of the specification and the drawings of the present application, is also included in the patent protection range of the present application.

Claims

1. A safe powder combustion test platform, comprising a powder storage tank (2), characterized in that, The front of the powder storage tank (2) is connected to the nitrogen source (5) through the piston pressure reducing valve (3); the piston of the powder storage tank (2) is connected to the displacement sensor (6), and the displacement sensor (6) transmits the displacement information to the monitoring and control terminal (1); the powder storage tank (2) is divided into a storage area and a fluidization area after the piston, and the fluidization area is connected to the nitrogen source (5) through the fluidization pressure reducing valve (4); the end of the fluidization area is connected to the combustion chamber (15) through the throttling orifice (9); the combustion chamber (15) is equipped with a cyclone separator (10), a plasma igniter (14) and an atomizer (16); the signal terminal of the plasma igniter (14) is connected to the monitoring and control terminal 1 through the plasma controller 12; the atomizer 16 is connected to the water tank 19 through the flow meter 17 and the water pump 18, and the flow meter 17 and the water pump 18 are controlled by the monitoring and control terminal 1; The piston pressure reducing valve 3 is connected to the first pressure sensor 7 at the air supply position. The fluidization zone is connected to the second pressure sensor 8; The third pressure sensor 11 is connected to the proximal end of the swirler (10) inside the combustion chamber (15); The fourth pressure sensor 13 is connected to the rear end of the combustion chamber (15) near the pressure relief valve (20); The pressure relief valve (20) is controlled by the monitoring and control terminal (1); The first pressure sensor (7), the second pressure sensor (8), the third pressure sensor (11) and the fourth pressure sensor (13) are all connected to the monitoring and control terminal (1) and controlled by it.

2. The safe powder combustion test platform according to claim 1, characterized in that: The pushing action of the nitrogen gas source (5) and piston pressure reducing valve (3) on the piston can be replaced by a precision motor, that is, the precision motor pushes the piston to supply powder according to the preset powder flow rate.

3. The powder combustion test platform with safety assurance according to claim 1, characterized in that: The third pressure sensor (11) and the fourth pressure sensor (13) reduce the fluctuation of pressure detection in large-volume containers by coordinating two parameters. At the same time, the third pressure sensor (11) also has the function of monitoring the inlet pressure of the cyclone separator (10).

4. The safety-assured powder combustion test platform according to claim 1, characterized in that: The combustion chamber (15) is detachable, ensuring the powder is sealed during the reaction.

5. The safety-assured powder combustion test platform according to claim 1, characterized in that: The pressure relief valve (20) has a filter screen installed inside.

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