阅读说明：本技术 一种风洞实验用蓄热加热器的测控装置 (Measurement and control device of heat storage heater for wind tunnel experiment ) 是由 高占彪 顾洪斌 黄河激 岳连捷 于 2021-08-26 设计创作，主要内容包括：本发明属于航空航天地面试验设备技术领域,针对现有技术中存在的人工调节难以对应突发状况,降低了试验设备的安全性的技术问题,本发明公开了一种风洞实验用蓄热加热器的测控装置,安装在蓄热加热器上,工作于蓄热式纯净空气风洞的预加热阶段,包括工质供应系统、燃烧器、蓄热本体、冷空气进气阀、排烟系统、排污系统,所述蓄热本体竖直安装在蓄热井支撑架上,燃烧器通过法兰连接安装在蓄热本体顶部,工质供应系统的各条供气管路通过高温软管与燃烧器接口连接；所述的冷空气进气阀、排烟系统、排污系统安装在蓄热本体下部。本发明能够实现蓄热加热器自动化运行,为风洞的安全运行提供技术保障,提高了系统的可靠性、安全性,降低了偶发事件的可能性。(The invention belongs to the technical field of aerospace ground test equipment, and aims to solve the technical problems that manual regulation in the prior art is difficult to correspond to sudden situations and the safety of test equipment is reduced, the invention discloses a measurement and control device of a heat storage heater for a wind tunnel experiment, which is arranged on the heat storage heater, works in the preheating stage of a heat storage type pure air wind tunnel and comprises a working medium supply system, a burner, a heat storage body, a cold air inlet valve, a smoke exhaust system and a sewage discharge system, wherein the heat storage body is vertically arranged on a heat storage well supporting frame, the burner is arranged at the top of the heat storage body through flange connection, and each air supply pipeline of the working medium supply system is connected with a burner interface through a high-temperature hose; the cold air inlet valve, the smoke exhaust system and the sewage discharge system are arranged at the lower part of the heat storage body. The invention can realize the automatic operation of the heat storage heater, provides technical guarantee for the safe operation of the wind tunnel, improves the reliability and the safety of the system and reduces the possibility of accidental events.)

1. A measurement and control device of a heat storage heater for a wind tunnel experiment is characterized by being mounted on the heat storage heater, working in the preheating stage of a heat storage type pure air wind tunnel, and comprising a working medium supply system, a burner, a heat storage body, a cold air inlet valve, a smoke exhaust system and a sewage discharge system, wherein the heat storage body is vertically mounted on a support frame of a heat storage well, the burner is mounted at the top of the heat storage body through flange connection, and each air supply pipeline of the working medium supply system is connected with a burner interface through a high-temperature hose; the cold air inlet valve, the smoke exhaust system and the sewage discharge system are arranged at the lower part of the heat storage body.

2. The measurement and control device of the heat storage heater for the wind tunnel experiment as claimed in claim 1, wherein the working medium supply system comprises a natural gas point path and an air point path, branches of a main path of the natural gas path, branches of a main path of the air path and an oxygen supplementing path; the natural gas point circuit and the air point circuit are respectively connected with an igniter of the combustor, the natural gas point circuit and the air point circuit output media with fixed flow and pressure, and the media output on-off is controlled by controlling a switch of a switch valve; each branch of the natural gas main path and each branch of the air main path are connected to the combustor in parallel, each branch of the natural gas and each branch of the air are provided with pressure/flow adjustable pressure regulating valves, and the flow of each medium entering the combustor is controlled through the regulating valves; and the oxygen input of the heat storage heater under the ultra-high temperature working condition is regulated through the oxygen supplementing circuit.

3. The measurement and control device of the heat storage heater for the wind tunnel experiment as claimed in claim 1, wherein the heat storage body is internally provided with a heat storage temperature detection system, the heat storage temperature detection system is arranged into a plurality of thermocouples which are circularly scattered from bottom to top along the central line of the heat storage body as a cylindrical axis, the thermocouples are connected to a remote acquisition module of the PLC control system through thermocouple compensation wires by adapter flanges, and the temperature is detected by the heat storage temperature detection system.

4. The measurement and control device of the heat storage heater for the wind tunnel experiment as claimed in claim 3, wherein the heat storage temperature detection system is configured with different thermocouples according to different temperature intervals, the measurement points are arranged in a row at an angle of 30 degrees between each layer, each row is provided with a plurality of thermocouples from inside to outside, and a plurality of layers are uniformly arranged from top to bottom.

5. The measurement and control device of the heat storage heater for the wind tunnel experiment as claimed in claim 1, wherein the opening at the lower end of the heat storage body is connected with the temperature-resistant stainless steel pipeline through a flange, the cold air intake valve and the smoke exhaust valve of the smoke exhaust system are arranged at 90 degrees and connected with the temperature-resistant stainless steel pipeline through a tee joint, the distance between the interface of the cold air intake valve and the opening of the heat storage body is smaller than the distance between the interface of the smoke exhaust valve and the opening of the heat storage body, the tail end of the temperature-resistant stainless steel pipeline is vertically connected with a blowdown system, the blowdown system comprises a high-temperature valve and a zero-opening-pressure check valve, the blowdown system and the smoke exhaust system are synchronously opened, and after preheating is completed, the blowdown system and the smoke exhaust system are delayed to be closed.

6. The measurement and control device of the heat storage heater for the wind tunnel experiment as claimed in claim 1, wherein the smoke exhaust system comprises a smoke exhaust valve, a fan and a differential pressure sensor, wherein the upstream of the smoke exhaust valve is connected with a temperature-resistant stainless steel pipeline, the downstream of the smoke exhaust valve is connected with the fan, and the downstream of the fan is connected with a normal pressure smoke exhaust pipeline communicated with outdoor atmosphere; the pressure difference sensor is installed on the heat storage body, one end of a measuring head of the pressure difference sensor is installed at a position, close to the burner, of the heat storage body, and the other end of the pressure difference sensor is installed at a joint of the heat storage body and the temperature-resistant stainless steel pipeline.

7. The measurement and control device of the heat storage heater for the wind tunnel experiment as claimed in claim 6, wherein the differential pressure sensor, the fan and the PLC control system form a closed loop control system, a signal of the differential pressure sensor is transmitted back to the PLC control system through the remote acquisition module, the PLC control system controls the start and stop of the fan according to a preset differential pressure threshold value, the magnitude of an input signal of the fan controller is controlled according to the magnitude of the differential pressure signal, namely the power of the fan, and the differential pressure signal is in direct proportion to the power of the fan.

8. The measurement and control device of the heat storage heater for the wind tunnel experiment according to claim 1 or 6, wherein a certain interval time is set when a plurality of valves are opened or closed in sequence; the cold air inlet valve is set as a high-temperature-resistant valve, the closing of the cold air inlet valve is used as a prerequisite judgment condition for starting heat storage, and the opening of the cold air inlet valve is used as a final judgment condition for ending heat storage; the smoke exhaust system is characterized in that a smoke exhaust valve is arranged as a high-temperature-resistant valve, a fan is arranged as a variable-frequency explosion-proof axial flow fan, the smoke exhaust system is opened as a prerequisite judgment condition for starting heat storage, and the smoke exhaust system is closed as a prerequisite judgment condition for starting a wind tunnel test after heat storage is finished.

9. The measurement and control device of the heat storage heater for the wind tunnel experiment as claimed in claim 1, characterized in that a flame detector and a PLC control system are further provided, the flame detector is arranged at the flame of the burner, and the flame detector is used for detecting the main flame of the burner; the PLC control system comprises a central processing module, a remote data acquisition module and a remote control module, wherein the central processing module, the remote data acquisition module and the remote control module are in communication connection through Ethernet, and are used for acquiring input signals, executing user programs, refreshing the output of the system, storing programs and related data; collecting and processing data of the field equipment through a remote data collection module; and issuing an action command to the field actuating mechanism through the remote control module.

10. A control system of a heat storage heater for a wind tunnel experiment is based on any one of claims 1 to 9, and is characterized by comprising the following steps:

s00: starting; the test enters an automatic operation stage;

s10: opening a smoke exhaust system and a blowdown system, closing a cold air inlet valve, and sequentially opening valves of a working medium supply system;

s20: sequentially opening a natural gas point path and an air point path, and judging whether the natural gas point path and the air point path respectively reach preset pressure;

s30: switching on a power supply and judging whether the pressure of the igniter reaches a preset value or not;

s40: synchronously opening each branch of the natural gas main path, each branch of the air main path and the oxygen supplementing path according to a preset program, and setting the pressure of each pressure regulating valve according to a preset value;

s50: judging whether the flame detector gives an alarm or not, and entering a corresponding step;

s60: judging whether the pressure of the igniter reaches a preset value or not, or entering a step of restarting the igniter;

s70: changing and adjusting parameters of the pressure regulating valve according to a preset value or a preset curve, changing the flow and further changing the flame power; judging whether the heat storage body reaches the required temperature gradient or not through a heat storage temperature detection system;

s80: sequentially zeroing valves of all branches of the natural gas main path, the oxygen supplementing path and all branch valves of the air main path, closing stop valves of all paths, a smoke exhaust system and a blowdown system, and opening a cold air inlet valve;

s90: and (4) ending: and (5) finishing the heat storage process and entering a waiting stage of a wind tunnel test.

Technical Field

The invention belongs to the technical field of aerospace ground test equipment, and particularly relates to a measurement and control device of a heat storage heater for a wind tunnel experiment.

Background

The pure air wind tunnel can provide relatively clean high enthalpy gas incoming flow, is indispensable equipment for ground test of the hypersonic aircraft, and is widely accepted internationally. However, due to the technical difficulty, the purified air tunnels developed at home and abroad are very few. The heat storage heater is one of the key devices, and how to realize the stable combustion of the heat storage heater with large ratio variable power is inevitably the technical difficulty of the design of the heat storage heater. The prior technical method is that a manual and remote control method is adopted, and a tester remotely operates the heat storage heater in a control room through a distributed control system. The method is simple and clear, and can enable a tester to adjust the working state of the heat accumulator in time. But the disadvantages are obvious:

1) the emergency response of manual regulation is not enough, the heat storage heater has a complex structure, the control part is dispersed, the number of related signals is large, the types are multiple, the manual regulation is difficult to correspond to the emergency situation, the randomness of the accidental event is increased, and the safety of the test equipment is reduced.

2) The transition depends on the professional quality of the tester, and the tester needs to be skilled in the aspects of the thermal storage heater.

3) The method has the advantages that the physical quality of testers is greatly tested, the preheating process generally lasts for more than 40 hours, the testers need to be highly concentrated in the preheating process to deal with sudden situations, and the energy and physical strength of the testers are greatly consumed.

Disclosure of Invention

Aiming at the technical problems that manual regulation in the prior art is difficult to correspond to emergency situations and the safety of test equipment is reduced, the invention aims to provide the measuring and controlling device of the heat storage heater for the wind tunnel experiment, which can realize the automatic operation of the heat storage heater, provide technical guarantee for the safe operation of the wind tunnel, improve the reliability and the safety of a system and reduce the possibility of accidental events.

The technical scheme adopted by the invention is as follows:

a measurement and control device of a heat storage heater for a wind tunnel experiment is arranged on the heat storage heater, works in the preheating stage of a heat storage type pure air wind tunnel, and comprises a working medium supply system, a burner, a heat storage body, a cold air inlet valve, a smoke exhaust system and a sewage discharge system, wherein the heat storage body is vertically arranged on a support frame of a heat storage well, the burner is arranged at the top of the heat storage body through flange connection, and each air supply pipeline of the working medium supply system is connected with a burner interface through a high-temperature hose; the cold air inlet valve, the smoke exhaust system and the sewage discharge system are arranged at the lower part of the heat storage body.

Further, the working medium supply system comprises a natural gas point circuit (short for natural gas point circuit) and an air point circuit (short for empty point circuit) for the igniter, each branch of the natural gas point circuit, each branch of the air main circuit and an oxygen supplementing circuit; the natural gas point circuit and the empty point circuit are respectively connected with an igniter of the combustor, the igniter is set as a fixed power igniter, the natural gas point circuit and the empty point circuit are provided with fixed value pressure reducing valves, the natural gas point circuit and the air point circuit output media with fixed flow and pressure, and the media output on-off is controlled by controlling a switch of a switch valve; each branch of the natural gas main path and each branch of the air main path are connected to the combustor in parallel, each branch of the natural gas main path and each branch of the air main path are provided with pressure/flow adjustable pressure regulating valves, and the flow of each medium entering the combustor is controlled through the regulating valves; and an oxygen supplementing circuit is arranged to adjust the oxygen input of the ultra-high temperature working section of the heat storage heater. The structural design aims to reduce control loops, simplify the structure, improve the reliability of the system and reduce the cost.

Preferably, the natural gas main path and the air main path are set according to actual conditions and are a combination of a plurality of branches with different flow coefficients, and the branches can be increased or decreased according to actual needs. The number of the branches can be flexibly adjusted, and the wide-range flow regulation function is realized.

Further, the inside heat accumulation temperature detection system that sets up of heat accumulation body, heat accumulation temperature detection system sets up to be the cylinder axis along the central line of heat accumulation body, from inside to outside, is a plurality of thermocouples that circular scattering was arranged by bottom to top, and on the thermocouple passed through adapter flange and is connected to PLC control system's remote acquisition module through thermocouple compensation wire, detected heat accumulator temperature gradient through heat accumulation temperature detection system.

Furthermore, the heat storage temperature detection system is configured with different thermocouples according to different temperature intervals, the measuring points are arranged in a row at an angle of 30 degrees between every two layers, a plurality of thermocouples are arranged in each row from inside to outside, and a plurality of layers are uniformly arranged from top to bottom.

Preferably, the measuring points are arranged in a row at an angle of 30 degrees between every two layers, 6 thermocouples are arranged in each row from inside to outside, 12 layers are uniformly arranged from top to bottom, the upper 4 layers are 4 adjacent to the inner ring and are two B-type armored thermocouples, the upper 4 layers are 2 thermocouples on the outer ring, the middle 4 layers are all B-type armored thermocouples and K-type armored thermocouples, and the lower four layers are all K-type thermocouples. The structural design can monitor the temperature rise conditions of all the heat storage bodies, and the burden of the system caused by excessive measuring points is avoided; in addition, different thermocouples are configured according to different temperature intervals, and a scheme of one-for-one use is adopted, so that the thermocouples can be checked with each other and can be replaced to some extent.

Further, heat accumulation body lower extreme trompil department is connected with temperature resistant stainless steel pipeline through the flange, and cold air admission valve and smoke exhaust system's smoke damper become 90 and arrange through the tee bend and be connected with temperature resistant stainless steel pipeline, and cold air admission valve interface is less than smoke damper interface and heat accumulation body trompil department distance with heat accumulation body trompil department distance, and cold air admission valve is next to heat accumulation body trompil department, and smoke exhaust system interface and cold air admission valve interface distance set up to 0.5 m. The vertical connected blowdown system in temperature resistant stainless steel pipeline end, blowdown system include high temperature valve and zero cracking pressure's check valve, and blowdown system and the system of discharging fume are opened in step, preheat the completion back, postpone to close, through the waste water that the blowdown system discharged the burning back and produced, blowdown system and PCL observe and control the system and carry out logic interlocking, have guaranteed promptly that waste water drains to the greatest extent, have avoided the atmosphere to flow backward from blowdown system heat accumulation body again, destroy the negative pressure environment that combustor work needs.

Furthermore, the smoke exhaust system comprises a smoke exhaust valve, a fan and a differential pressure sensor, wherein the upstream of the smoke exhaust valve is connected with a temperature-resistant stainless steel pipeline, the downstream of the smoke exhaust valve is connected with the fan, and the downstream of the fan is connected with a normal-pressure smoke exhaust pipeline to be communicated with outdoor atmosphere; the pressure difference sensor is installed on the heat storage body, one end of a measuring head of the pressure difference sensor is installed at a position, close to the burner, of the heat storage body, and the other end of the pressure difference sensor is installed at a joint of the heat storage body and the temperature-resistant stainless steel pipeline.

Furthermore, the pressure difference sensor, the fan and the PLC control system form a closed-loop control system, signals of the pressure difference sensor are transmitted back to the PLC control system through the remote acquisition module, the PLC control system controls the start and stop of the fan according to a preset pressure difference threshold value, the size of input signals of the fan controller is controlled according to the size of the pressure difference signals, namely the power of the fan, and the pressure difference signals are in direct proportion to the power of the fan. The structure can ensure the negative pressure environment in the heat storage body and provide the working environment for stable combustion of the combustor.

Further, when the valves are opened or closed in sequence, a certain interval time is set; the cold air inlet valve is set to be a high-temperature-resistant valve, the cold air inlet valve is closed to serve as a prerequisite judgment condition for starting heat storage, and the cold air inlet valve is opened to serve as a last judgment condition for ending heat storage. During heat storage, hot air cannot flow back into the cold air to carry out the pipeline, so that an upstream system of the pipeline is damaged; the wind tunnel test ensures the smoothness of the cold air inlet channel and eliminates the failure of the wind tunnel test caused by the failure of pressure building.

The smoke exhaust system is characterized in that a smoke exhaust valve is arranged as a high-temperature-resistant valve, a fan is arranged as a variable-frequency explosion-proof axial flow fan, the smoke exhaust system is opened as a prerequisite judgment condition for starting heat storage, and the smoke exhaust system is closed as a prerequisite judgment condition for starting a wind tunnel test after heat storage is finished. The fans and the smoke exhaust valve are interlocked logically, the smoke exhaust valve is opened to serve as a prerequisite judgment condition for starting the fans, and the smoke exhaust valve is closed to serve as a prerequisite judgment condition for closing the fans. The structural design has the advantages that: during heat storage, the negative pressure environment of the heat storage body is smoothly established; during the wind tunnel test, avoided cold air to follow the direct row of exhaust system, because of the wind tunnel test failure that can't build pressure and lead to.

When the valves are opened or closed in sequence, a certain interval time is set. Each valve or actuating mechanism of the present invention has feedback signals transmitted to the control system, but these signals are not used as the basis for the judgment of the program execution. The technical characteristics have the advantages that the control system and workers can clearly know whether the valve or the actuating mechanism acts in place or not, the situation that the judgment condition is repeatedly set, logic disorder is caused, and the instability of system operation is increased is avoided.

Further, a flame detector and a PLC control system are also arranged, the flame detector is arranged at the flame of the burner, and the main flame of the burner is detected by the flame detector; the PLC control system comprises a central processing module, a remote data acquisition module and a remote control module, wherein the central processing module, the remote data acquisition module and the remote control module are in communication connection through Ethernet, and are used for acquiring input signals, executing user programs, refreshing the output of the system, storing programs and related data; collecting and processing data of the field equipment through a remote data collection module; and issuing an action command to the field actuating mechanism through the remote control module.

The utility model provides a control system of heat accumulation heater for wind-tunnel experiments, based on a measurement and control device of heat accumulation heater for wind-tunnel experiments specifically includes the following step:

s00: starting; the test enters an automatic operation stage;

s10: opening a smoke exhaust system and a blowdown system, closing a cold air inlet valve, and sequentially opening valves of a working medium supply system;

s20: sequentially opening a natural gas point path and an air point path, and judging whether the natural gas point path and the air point path respectively reach preset pressure;

s30: switching on a power supply and judging whether the pressure of the igniter reaches a preset value or not;

s40: synchronously opening each branch of the natural gas main path, each branch of the air main path and the oxygen supplementing path according to a preset program, and setting the pressure of each pressure regulating valve according to a preset value;

s50: judging whether the flame detector gives an alarm or not, and entering a corresponding step;

s60: judging whether the pressure of the igniter reaches a preset value or not, or entering a step of restarting the igniter;

s70: changing and adjusting parameters of the pressure regulating valve according to a preset value or a preset curve, changing the flow and further changing the flame power; judging whether the heat storage body reaches the required temperature gradient or not through a heat storage temperature detection system;

s80: sequentially zeroing a natural gas branch, an oxygen supplementing path and an air branch pressure regulating valve, closing stop valves of all paths, closing a natural gas point path and an air point path, a smoke exhaust system and a blowdown system, and opening a cold air inlet valve;

s90: and (4) ending: and (5) finishing the heat storage process and entering a waiting stage of a wind tunnel test.

The invention has the beneficial effects that:

1. the control method can select a full-manual mode, a semi-automatic mode and a full-automatic mode. The full-manual mode, the semi-automatic mode and the full-automatic mode can be automatically switched, and the full-manual mode is convenient for the debugging of workers; in a semi-automatic mode, corresponding safety interlocking setting is carried out, so that a worker can conveniently find out the performance of the heat storage heater; in a full-automatic mode, the test process can be solidified, and the system safety and the running stability of the heat storage heater are greatly improved.

2. The control method of the invention is flexible, changeable, gradually propelled, flexible and intuitive, greatly reduces the development time required by system design, and improves the quality and efficiency of wind tunnel tests.

3. The control method has clear principle, simple structure, easy realization and extremely high application value.

4. The control method can realize the stable combustion of the heat storage heater with large ratio and variable power.

Drawings

FIG. 1 is a schematic diagram of the operation of the regenerative burner of the present invention;

FIG. 2 is a schematic diagram of a working medium supply system according to the present invention;

FIG. 3 is a diagram of the operation steps of a measurement and control system of a thermal storage heater for a wind tunnel test according to the present invention;

FIG. 4 is a graph of experimental data for an example of the present invention;

wherein, 1, a working medium supply system; 2. a burner; 3. a heat storage body; 4. a thermal storage temperature detection system; 5. a cold air intake valve; 6. a smoke exhaust system; 61. a smoke exhaust valve; 62. a fan; 63. a differential pressure sensor; 7. a blowdown system; 8. a flame detector.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

According to the requirements of wind tunnel tests, the heat storage heater needs to provide high-temperature and high-pressure airflow with the temperature of 1200K-1600K, and alumina is selected as a porous heat storage ceramic material for realizing the technical requirements, wherein the accumulation volume is 0.8 meter in diameter and 5 meters in height. Due to the cold and heat shock resistant nature of alumina, it is required that the temperature rise per hour not exceed 80 ℃. The operation of the burner 2 of the example was atmospheric combustion, i.e., the combustion pressure was 0.1 MPa. The power of the combustor 2 is about 600kW, and the flow and pressure of each path of the working medium supply system 1 are arranged as follows:

name of working medium	Throat value (mm)	Flow (g/s)	Voltage regulation (MPa)
				Empty point	2	25	3.45
Natural gas point	2	1.5	1.40
				Air owner 1	2	25-120	3.45-16.4
Air owner 2	4	120-350	4.13-12.04
				Natural gas main 1	5	1.5-6	0.5-2
Natural gas main 2	10	6-20	0.5-1.67
				Oxygen gas	1.1	10-25	2.17-10.08

The following is specifically illustrated with reference to the examples:

example 1

As shown in fig. 1, a measurement and control device of a heat storage heater for a wind tunnel experiment is used in a preheating stage of a heat storage type pure air wind tunnel, wherein a heat storage heater control system comprises a working medium supply system 1 (shown in fig. 2), a burner 2, a heat storage body 3, a heat storage temperature detection system 4, a cold air intake valve 5, a smoke exhaust system 6 and a sewage discharge system 7, the heat storage body 3 is vertically installed on a heat storage well support frame, the burner 2 is installed at the top of the heat storage body 3 through flange connection, and each air supply channel of the working medium supply system 1 is connected with an interface of the burner 2 through a high temperature hose; the cold air inlet valve 5, the smoke exhaust system 6 and the sewage discharge system 7 are arranged at the lower part of the heat storage body 3.

On the basis of embodiment 1, according to another embodiment of the present invention, as shown in fig. 1, the working medium supply system 1 mainly includes a natural gas point circuit (natural gas point for short) and an air point circuit (empty point for short) for an igniter; each branch of the natural gas main path and each branch of the air main path which are used for the wide-range flow regulation of the combustor 2, and an oxygen supplementing path (oxygen path for short) used for oxygen input of the ultra-high temperature working section of the heat storage heater; the natural gas point circuit and the empty point circuit are respectively connected with an igniter, the igniter is set as a fixed power igniter, the natural gas point circuit and the empty point circuit are provided with fixed value pressure reducing valves, the natural gas point circuit and the air point circuit output media with fixed flow and pressure, and the media output on-off is controlled by controlling a switch of a switch valve; each branch of the natural gas main path and each branch of the air main path are connected to the combustor 2 in parallel, each branch of the natural gas and each branch of the air are provided with pressure/flow adjustable pressure regulating valves, and the flow of each medium entering the combustor 2 is controlled by the regulating valves; and an oxygen supplementing circuit is arranged to adjust the oxygen input of the ultra-high temperature working section of the heat storage heater. The structural design aims to reduce control loops, simplify the structure, improve the reliability of the system and reduce the cost.

The igniter related to the embodiment is a fixed power igniter, and the natural gas point circuit and the idle point circuit only need to output fixed 1.5g/s and 25g/s media, so that fixed value pressure reducing valves are adopted for the natural gas point circuit and the idle point circuit, and the system realizes on-off of the media output by controlling the switch of the switch valve. The advantages of this are that the control loop is reduced, the structure is simplified, the reliability of the system is improved and the cost is reduced.

The natural gas main road and the air main road are arranged according to actual conditions, the natural gas main road and the air main road of the embodiment respectively comprise 3 branches with different flow coefficients, and the branches can be increased or decreased according to actual needs. The number of the branches can be flexibly adjusted, and the wide-range flow regulation function is realized.

On the basis of the embodiment 1, as shown in fig. 3, in another embodiment of the present invention, a thermal storage temperature detection system 4 is disposed inside the thermal storage body 3, the thermal storage temperature detection system 4 is disposed as a plurality of thermocouples that are circularly scattered from inside to outside along a central line of the thermal storage body 3, and the thermocouples are connected to a remote acquisition module of the PLC control system through thermocouple compensation wires via adapter flanges, and the temperature is detected by the thermal storage temperature detection system 4.

The heat storage temperature detection system 4 is configured with different thermocouples according to different temperature intervals, the measuring points are arranged in a row at an angle of 30 degrees between each layer, a plurality of thermocouples are arranged in each row from inside to outside, and a plurality of layers are uniformly arranged from top to bottom.

More specifically, the measuring points are arranged in a row at an angle of 30 degrees between every two layers, and 6 thermocouples are arranged in each row from inside to outside at a distance of 15 cm; 12 layers are uniformly arranged from top to bottom, 4 layers of the upper 4 layers close to the inner ring are two B-type armored thermocouples with the thickness of 0.5mm, 2 layers of the upper 4 layers of the outer ring and all 4 layers of the middle 4 layers of the thermocouples are one B-type armored thermocouple with the thickness of 0.5mm and one K-type armored thermocouple with the thickness of 0.5mm, and the lower four layers of the thermocouples are all K-type thermocouples with the thickness of 0.5 mm. The arrangement has the advantages that the temperature rise conditions of all the heat storage bodies 3 can be monitored, and the burden of the system caused by excessive measuring points is avoided; in addition, different thermocouples are configured according to different temperature intervals, and a scheme of one-for-one use is adopted, so that the thermocouples can be checked with each other and can be replaced to some extent.

In another embodiment of the present invention based on embodiment 1, as shown in fig. 1, the cool air intake valve 5, the blowdown system 7, and the smoke exhaust system 6 are located at the lower portion of the heat storage body 3. The opening of the lower end of the heat storage body 3 is connected with a temperature-resistant stainless steel pipeline through a flange, the cold air intake valve 5 and the smoke exhaust valve 61 of the smoke exhaust system 6 are arranged at 90 degrees and are connected with the smoke exhaust pipeline through a tee joint, the distance between the interface of the cold air intake valve 5 and the opening of the heat storage body 3 is smaller than the distance between the interface of the smoke exhaust valve 61 and the opening of the heat storage body 3, the cold air intake valve 5 is close to the opening of the heat storage body 3, and the distance between the interface of the smoke exhaust system 6 and the interface of the cold air intake valve 5 is set to be 0.5 m.

The tail end of the temperature-resistant stainless steel pipeline is vertically connected with a sewage system 7, the sewage system 7 comprises a high-temperature valve (capable of bearing 300 ℃) and a check valve with zero opening pressure, and the drift diameter is set to DN 50. The blowdown system 7 and the smoke exhaust system 6 are logically interlocked, the blowdown system 7 and the smoke exhaust system 6 are synchronously opened, after preheating is completed, the preheating is delayed to be closed, waste water generated by combustion is discharged through the blowdown system 7, and the blowdown system 7 and the PCL measurement and control system are logically interlocked, so that waste water is completely discharged, and the phenomenon that the atmosphere flows back to the heat storage body 3 from the blowdown system 7 to damage a negative pressure environment is avoided.

On the basis of embodiment 1, in another embodiment of the present invention, as shown in fig. 1, the smoke exhaust system 6 includes a smoke exhaust valve 61, a fan 62 and a differential pressure sensor 63, wherein the upstream of the smoke exhaust valve 61 is connected to a temperature-resistant stainless steel pipeline, the downstream of the smoke exhaust valve 61 is connected to the fan 62, and the downstream of the fan 62 is connected to a normal-pressure temperature-resistant stainless steel pipeline to communicate with the outdoor atmosphere; the differential pressure sensor 63 is installed on the heat storage body 3, and the measuring range of the differential pressure sensor 63 is 0-40 bar. One end of a measuring head of a differential pressure sensor 63 is arranged at the position of the heat storage body 3 close to the burner 2, and the other end of the differential pressure sensor 63 is arranged at the joint of the heat storage body 3 and the temperature-resistant stainless steel pipeline.

In another embodiment of the present invention based on embodiment 1, as shown in fig. 1, the differential pressure sensor 63, the variable frequency fan 62, and the PLC control system form a closed-loop control system. The signal of the differential pressure sensor 63 is transmitted back to the PLC control system through the remote acquisition module, the PLC control system determines the start and stop of the fan 62 according to a preset differential pressure threshold value, and determines the input signal of the controller of the variable frequency fan 62, namely the power of the fan 62, according to the differential pressure signal. The differential pressure signal is proportional to the fan 62 power. This arrangement has an advantage that a stable negative pressure environment can be ensured in the heat accumulating body 3, providing a working environment in which the burner 2 burns stably.

In another embodiment of the present invention, based on embodiment 1, as shown in fig. 1, the cool air intake valve 5 is a valve capable of withstanding a high temperature of 600 ℃, and the valve and the system are logically interlocked, and the closing thereof is used as a prerequisite judgment condition for the start of heat storage, and the opening thereof is used after a final judgment condition for the end of heat storage. The arrangement has the advantages that during heat storage, hot air cannot flow back into the cold air pipeline to damage an upstream system of the pipeline; the wind tunnel test ensures the smoothness of the cold air inlet channel and eliminates the failure of the wind tunnel test caused by the failure of pressure building.

The smoke exhaust valve 61 of the smoke exhaust system 6 is arranged as a high-temperature valve capable of bearing 600 ℃, the fan 62 is arranged as a variable-frequency explosion-proof axial flow fan 62, and the power is 25 kW. The smoke evacuation system 6 is logically interlocked with the system, which is opened as a prerequisite judgment condition for the start of heat storage, and which is closed as a prerequisite judgment condition for the start of a wind tunnel test for which heat storage is ended. The fan 62 is logically interlocked with the smoke exhaust valve 61, the smoke exhaust valve 61 is opened as a prerequisite judgment condition for starting the fan 62, and the smoke exhaust valve 61 is closed as a prerequisite judgment condition for closing the fan 62. The advantage of such an arrangement is that, during heat storage, the negative pressure environment of the heat storage body 3 is smoothly established; during the wind tunnel test, avoided cold air directly to discharge from exhaust system 6, the wind tunnel test failure that can't build pressure and lead to.

In the embodiment of the invention, when the valves are opened or closed in sequence, the interval time is 0.2s, each valve or actuating mechanism in the embodiment has a feedback signal transmitted to the control system, but the signals are not used as the judgment basis for program execution. The advantage of setting up like this is that control system and staff can know clearly whether valve or actuating mechanism move in place, has avoided repeatedly setting up the judgement condition again, leads to the logic confusion, increases system operation unstability.

On the basis of embodiment 1, in another embodiment of the present invention, a flame detector 8 for detecting the main flame of the burner 2 and a computer control system (PLC control system) based on PLC are further provided, the flame detector 8 is provided at the burner 2, and the main flame of the burner 2 is detected by the flame detector 8; the PLC control system comprises a central processing module (model: CPU1513-1PN), a remote data acquisition module (model: DI 32x24VDC HF and AI 8x U/R/RTD/TC HF) and a remote control module (DQ 32x24VDC/0.5A ST HFAQ 8xU/I HS), which are in communication connection through the Ethernet, and the central processing module is used for acquiring input signals, executing user programs, refreshing the output of the system, storing programs and related data; collecting and processing data of the field equipment through a remote data collection module; and issuing an action command to the field actuating mechanism through the remote control module.

As shown in fig. 3, a control system of a thermal storage heater for a wind tunnel experiment is based on a measurement and control device of the thermal storage heater for the wind tunnel experiment, and specifically includes the following steps:

s00: starting; the test enters an automatic operation stage;

s10: opening a smoke exhaust system 6 and a blowdown system 7, closing a cold air inlet valve 5, and sequentially opening valves of a working medium supply system;

s20: sequentially opening an empty point path and a natural gas path, and judging whether the empty point path and the natural gas path respectively reach a preset pressure;

s30: electrifying the spark plug and judging whether the pressure of the igniter reaches a preset value;

s40: synchronously opening each branch of the natural gas main path, each branch of the air main path and the oxygen supplementing path according to a preset program, and setting the pressure of each pressure regulating valve according to a preset value;

s50: judging whether the flame detector 8 gives an alarm or not, and entering a corresponding step;

s60: judging whether the pressure of the igniter reaches a preset value or not, or entering a step of restarting the igniter;

s70: changing and adjusting parameters of the pressure regulating valve according to a preset value or a preset curve so as to change the flow and further change the flame power; the heat storage temperature detection system 4 judges whether the heat storage body 3 reaches a required temperature gradient;

s80: sequentially zeroing pressure regulating valves of all branches of the natural gas main path, the oxygen supplementing path and all branches of the air main path, closing stop valves of all paths, a smoke exhaust system 6 and a blowdown system 7, and opening a cold air inlet valve 5;

s90: and (4) ending: and (5) finishing the heat storage process and entering a waiting stage of a wind tunnel test.

As shown in fig. 4, the heating data of the first effective test of the embodiment is shown, and it can be seen from fig. 4 that the temperature rise in the heating process is smooth and continuous. The function of stepless regulation of flow in the measuring range is realized. The accurate control of typical working conditions is realized, the reheating capacity after the wind tunnel test is realized, and the test efficiency is greatly improved. The invention has clear principle, simple structure, easy realization and extremely high application value.

The above description is not meant to be limiting, it being noted that: it will be apparent to those skilled in the art that various changes, modifications, additions and substitutions can be made without departing from the true scope of the invention, and these improvements and modifications should also be construed as within the scope of the invention.