CN204594950U - The constant volume combustion system analyzed is detected for solid fuel ignition - Google Patents

Abstract

The utility model provides a constant-volume combustion system that can be used for analysis and detection of solid fuel combustion, including a constant-volume combustion bomb, an ignition system, a flame image photography system, a data acquisition system, a gas heating and heat preservation system, a scavenging system, and a gas mixing system , a mixed gas distribution system and an exhaust system; wherein, the data acquisition system is connected to the constant-volume incendiary bomb through the ignition system and the flame image photography system; the data acquisition system is through the gas heating and heat preservation system Respectively connect the constant volume incendiary bomb and the mixed gas distribution system; the scavenging system is connected to the constant volume incendiary bomb and the mixed gas distribution system; the gas mixing system is connected to the mixed gas distribution system; The exhaust system is connected to the constant volume incendiary bomb. The utility model has reasonable design, simple structure, stable solid fuel combustion, and can fully record the temperature, pressure, and changes of intermediate products in the solid fuel combustion process during the test.

Description

Constant volume combustion system for detection and analysis of solid fuel combustion

technical field

The utility model relates to solid fuel combustion, in particular to a constant volume combustion system used for detection and analysis of solid fuel combustion.

Background technique

The constant volume combustion system has a simple structure, and the components can be changed at will to achieve specific functions. It is an important tool in the basic research of combustion theory. By setting parameters such as thermodynamic parameters (temperature, dynamic pressure, gas atmosphere, etc.) and ignition parameters (ignition energy, ignition time, etc.) in the process of fuel combustion, the influence on fuel combustion performance is studied. Generally speaking, the common constant volume combustion system includes: constant volume incendiary bomb, ignition system, gas distribution system, and data acquisition system. However, according to different test purposes, different constant-volume incendiary bombs have different structural components and functional realizations. Since the constant volume incendiary bomb has the characteristic of providing a stable and controllable ambient pressure, it can also be used for other experimental research after certain modifications, such as the research on the spray characteristics of fuel and the combustion performance of solid fuel.

After searching the existing literature, it is found that the existing patented technologies related to constant volume incendiary bombs are all used in the combustion test of gas fuels, and there is no constant volume incendiary bomb for the analysis and detection of solid fuel combustion.

Utility model content

Aiming at the defects in the prior art, the purpose of this utility model is to provide a constant volume combustion system for detection and analysis of solid fuel combustion. It can be mainly used to analyze the influence of initial ambient pressure on the combustion characteristics of solid fuels.

According to the utility model, the constant volume combustion system that can be used for the analysis and detection of solid fuel combustion includes constant volume combustion bombs, ignition systems, flame image photography systems, data acquisition systems, gas heating and heat preservation systems, scavenging systems, gas mixing systems, Mixture distribution system and exhaust system;

Wherein, the data acquisition system is respectively connected to the constant-volume incendiary bomb through the ignition system and the flame image photography system; the data acquisition system is respectively connected to the constant-volume incendiary bomb and the The mixed gas distribution system; the scavenging system is connected to the constant volume combustion bomb and the mixed gas distribution system; the gas mixing system is connected to the mixed gas distribution system; the exhaust system is connected to the constant volume combustion bomb.

Preferably, the constant volume incendiary bomb includes an incendiary bomb body and a ceramic column; the ceramic column is arranged inside the incendiary bomb body.

Preferably, the gas mixing system includes a gas source, a pressure reducing valve, a second plug valve, a third one-way valve, a gas mixer and a first pressure gauge;

Wherein, the gas outlet of the gas source communicates with the gas mixer through the pressure reducing valve, the second plug valve, and the third one-way valve in sequence;

The first pressure gauge is disposed between the pressure reducing valve and the second plug valve.

Preferably, the mixed gas distribution system includes a third needle valve, a gas distribution chamber, a fourth one-way valve, a fourth needle valve, a first safety valve, a fifth needle valve and a second pressure gauge;

The gas mixer communicates with the gas distribution chamber through the third needle valve; the output port of the gas distribution chamber communicates with the incendiary bomb through the fourth one-way valve and the fourth needle valve in turn. body;

The first safety valve communicates with the gas distribution chamber; the second pressure gauge connects with the gas distribution chamber through the fifth needle valve.

Preferably, the scavenging system includes an air compressor, a first plug valve, a first one-way valve, a first needle valve, a second one-way valve and a second needle valve;

Wherein, the output port of the air compressor communicates with the incendiary body through the first cock valve, the first one-way valve and the first needle valve on the one hand, and passes through the first cock valve and the second one-way valve on the other hand. The gas distribution chamber communicates with the pilot valve and the second needle valve.

Preferably, the exhaust system includes a sixth needle valve, a third pressure gauge, a second safety valve and a third plug valve;

Wherein, the third pressure gauge communicates with the incendiary body through the sixth needle valve; both the second safety valve and the third cock valve communicate with the incendiary body.

Preferably, the ignition system includes a single-phase solid state relay, an ignition high-voltage package, a high-energy igniter, a heating wire, an adjustable transformer and a time relay;

Wherein, the data acquisition card of the data acquisition system is sequentially connected to the ignition high-voltage pack and the high-energy igniter through the switch circuit of the single-phase solid state relay; the high-energy igniter is arranged around the upper end of the ceramic column;

The data acquisition card of the data acquisition system is sequentially connected to the adjustable transformer and heating heating wire through the switch circuit of the time relay; the heating heating wire is arranged on the inner side of the ceramic column and along the axis of the ceramic column to extend.

Preferably, the flame image photography system includes a laser source, a mirror and a high-speed camera;

Wherein, the data acquisition card of the data acquisition system is connected to the high-speed camera; the incendiary bomb body is provided with a plurality of transparent windows; the output end of the laser source faces a transparent window; Light from a transparent window is reflected to the input of the high-speed camera.

Preferably, the gas heating and heat preservation system includes a first gas temperature controller, a first heater, a second gas temperature controller, and a second heater;

Wherein, the data acquisition card of the data acquisition system is connected to the first heater through the first gas temperature controller and connected to the second heater through the second gas temperature controller; The inner side of the elastic body; the second heater is arranged on the inner side of the gas distribution chamber.

Preferably, the data acquisition system includes a data acquisition card, a first thermocouple, a temperature transmitter, a pressure sensor, a signal isolator, a second thermocouple and a temperature transmitter;

Wherein, the first thermocouple is connected to the data acquisition card through the temperature transmitter; the pressure sensor is connected to the data acquisition card through the signal isolator; the second thermocouple is connected to the data acquisition card through the temperature transmitter. The transmitter is connected to the data acquisition card;

The first thermocouple and the pressure sensor are arranged inside the body of the incendiary bomb; the second thermocouple is arranged inside the gas distribution chamber.

Compared with the prior art, the utility model has the following beneficial effects:

1. The utility model has reasonable design, simple structure, stable solid fuel combustion, and can fully record the temperature, pressure, and intermediate product changes in the solid fuel combustion process during the test;

2. The utility model is equipped with a laser source and a high-speed camera, which can clearly record the flame image during the solid fuel combustion process;

3. The utility model is provided with a ceramic column, which facilitates the placement and practicality of solid fuel.

Description of drawings

Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation of one direction of constant volume incendiary bomb among the present invention;

Fig. 3 is the structural representation of another direction of constant volume incendiary bomb among the present invention;

Fig. 4 is a structural schematic diagram of another direction of the constant volume incendiary bomb in the present invention.

In the figure: 1 is a constant volume incendiary bomb; 2 is a ceramic column; 3 is a data acquisition system; 4 is a single-phase solid state relay; 5 is an ignition high-voltage package; 6 is a high-energy igniter; 7 is a heating wire; Transformer; 9 is a time relay; 10 is a laser source; 11 is a reflector; 12 is a high-speed camera; 13 is a first thermocouple; 14 is a temperature transmitter; 15 is a pressure sensor; 16 is a signal isolator; 17 is The second thermocouple; 18 is a temperature transmitter; 19 is a first gas temperature controller; 20 is a first heater; 21 is a second gas temperature controller; 22 is a second heater; 23 is an air compressor; 24 is the first plug valve; 25 is the first one-way valve; 26 is the first needle valve; 27 is the second one-way valve; 28 is the second needle valve; 29 is the gas source; 30 is the pressure reducing valve; 31 is The first pressure gauge; 32 is the second cock valve; 33 is the third one-way valve; 34 is the gas mixer; 35 is the third needle valve; 36 is the gas distribution chamber; 37 is the fourth one-way valve; 38 is the first Four-needle valve; 39 is the first safety valve; 40 is the fifth needle valve; 41 is the second pressure gauge; 42 is the sixth needle valve; 43 is the third pressure gauge; 44 is the second safety valve; 45 is the third Plug valve.

Detailed ways

The utility model is described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present utility model. These all belong to the protection domain of the present utility model.

In this embodiment, the constant volume combustion system that can be used for solid fuel combustion analysis and detection provided by the utility model includes a constant volume combustion bomb 1, an ignition system, a flame image photography system, a data acquisition system, a gas heating and heat preservation system, and a scavenging system. system, gas mixing system, mixed gas distribution system and exhaust system;

Wherein, the data acquisition system is respectively connected to the constant volume incendiary bomb 1 through the ignition system and the flame image photography system; the data acquisition system is respectively connected to the constant volume incendiary bomb 1 through the gas heating and heat preservation system and the mixed gas distribution system; the scavenging system connects the constant volume incendiary bomb 1 and the mixed gas distribution system; the gas mixing system connects the mixed gas distribution system; the exhaust system connects the Constant volume incendiary bomb 1. The constant volume incendiary bomb 1 includes an incendiary bomb body that provides the main place for solid combustion and an ultra-high temperature resistant ceramic column 2 for placing solid fuel; the ceramic column 2 is arranged inside the incendiary bomb body.

The constant-volume incendiary bomb 1 is used to provide the temperature and pressure environment for solid fuel combustion, the ignition system is used to preheat the solid fuel through the electric heating wire, and the high-energy igniter 6 ignites the solid fuel. The flame image photography system uses PLIF laser to detect the combustion flame. To collect the temperature, dynamic pressure and other thermal process changes in the incendiary bomb when the solid fuel is burned, the gas heating and heat preservation system is used to provide the reaction gas with a certain temperature value, and the scavenging system is used to sweep away the constant volume incendiary bomb and the mixed gas distribution chamber. Gas, the gas mixing system is used for the preparation of mixed gas when solid fuel is burned, the mixed gas distribution system is used for preheating and dispensing the mixed gas into the constant volume incendiary bomb, and the exhaust system is used to discharge the residual exhaust gas in the combusted constant volume bomb .

The gas mixing system includes a gas source 29, a pressure reducing valve 30, a second plug valve 32, a third check valve 33, a gas mixer 34 and a first pressure gauge 31; wherein, the gas outlets of the gas source 29 are sequentially The gas mixer 34 is communicated with the gas mixer 34 through the pressure reducing valve 30, the second cock valve 32, and the third one-way valve 33, and the gas is fully mixed in the gas mixer 34; the first pressure gauge 31 It is arranged between the pressure reducing valve 30 and the second plug valve 32 . A first pressure gauge 31 is used to provide pressure monitoring.

The mixed gas distribution system includes a third needle valve 35, a gas distribution chamber 36, a fourth one-way valve 37, a fourth needle valve 38, a first safety valve 39, a fifth needle valve 40 and a second pressure gauge 41; The gas mixer 34 communicates with the gas distribution chamber 36 through the third needle valve 35; the output port of the gas distribution chamber 36 communicates with the gas distribution chamber 36 through the fourth check valve 37 and the fourth needle valve 38 in sequence The body of the incendiary bomb; the first safety valve 39 communicates with the gas distribution chamber 36 ; the second pressure gauge 41 connects with the gas distribution chamber 36 through the fifth needle valve 40 . The mixed gas in the gas mixing system is stored in the gas distribution chamber 36 through the third needle valve 35, and after being heated and kept warm, it is filled into the constant-volume incendiary bomb through the fourth check valve 37 and the fourth needle valve 38, and the fifth needle valve 40, And the second pressure gauge 41 provides pressure detection, and the first safety valve 39 provides safety protection to prevent excessive pressure in the gas mixture supplier.

The scavenging system includes an air compressor 23, a first plug valve 24, a first one-way valve 25, a first needle valve 26, a second one-way valve 27 and a second needle valve 28; wherein, the air compressor On the one hand, the output port of 23 communicates with the incendiary body through the first cock valve 24, the first one-way valve 25, and the first needle valve 26 to scavenge the incendiary body with a given volume; A cock valve 24 , a second one-way valve 27 and a second needle valve 28 communicate with the gas distribution chamber 36 to purify the gas distribution chamber 36 .

The exhaust system includes a sixth needle valve 42, a third pressure gauge 43, a second safety valve 44 and a third plug valve 45; wherein, the third pressure gauge 43 communicates with the The body of the incendiary bomb; the second safety valve 44 and the third cock valve 45 are both connected to the body of the incendiary bomb. The third pressure gauge 43 is used to provide pressure detection, and the second safety valve 44 is used to provide safety protection.

The ignition system includes a single-phase solid relay 4, an ignition high-voltage pack 5, a high-energy igniter 6, a heating heating wire 7, an adjustable transformer 8 and a time relay 9; wherein, the data acquisition card 3 of the data acquisition system passes through the single-phase The switching circuit of the solid state relay 4 is connected successively with the ignition high-voltage pack 5 and the high-energy igniter 6; the high-energy igniter 6 is arranged on the upper periphery of the ceramic column 2; the data acquisition card 3 of the data acquisition system passes through The switching circuit of the time relay 9 is sequentially connected with the adjustable transformer 8 and the heating heating wire 7 ; the heating heating wire 7 is arranged inside the ceramic column 2 and extends along the axial direction of the ceramic column 2 .

Described flame image photography system comprises laser source 10, reflector 11 and high-speed camera 12; Wherein, the data acquisition card 3 of described data acquisition system is connected through described high-speed camera 12; Described incendiary bomb body is provided with many The output end of the laser source 10 faces one transparent window; the reflector 11 reflects the light emitted from the other transparent window to the input end of the high-speed camera 12. In the flame image system, the laser source 10 provides a light source to irradiate the combustion flame. After the flame image is reflected by the mirror 11, it is recorded by the high-speed camera 12 and sent to the data acquisition control card 3 for analysis.

The gas heating and heat preservation system includes a first gas temperature controller 19, a first heater 20, a second gas temperature controller 21, and a second heater 22; wherein, the data acquisition card 3 of the data acquisition system passes the first gas temperature The controller 19 is connected to the first heater 20 and connected to the second heater 22 through the second gas temperature controller 21; the first heater 20 is arranged inside the incendiary bomb body; the second heating The device 22 is arranged inside the gas distribution chamber 36 .

The data acquisition system includes a data acquisition card 3, a first thermocouple 13 of the temperature acquisition equipment in the incendiary bomb, a temperature transmitter 14, a pressure sensor 15, a signal isolator 16, and the first thermocouple 13 of the temperature acquisition equipment in the gas distribution system. Two thermocouples 17 and a temperature transmitter 18; wherein, the first thermocouple 13 is connected to the data acquisition card 3 by the temperature transmitter 14; the pressure sensor 15 is connected to the signal isolator 16 by the signal isolator The data acquisition card 3; the second thermocouple 17 is connected to the data acquisition card 3 through the temperature transmitter 18; the first thermocouple 13 and the pressure sensor 15 are arranged on the incendiary bomb body The inner side of the gas distribution chamber 36; the second thermocouple 17 is arranged on the inner side of the gas distribution chamber 36.

When using the constant volume combustion system provided by the utility model that can be used for the analysis and detection of solid fuel combustion, the specific steps are as follows:

Step 1: Take a quantitative amount of 0.10g of nano-aluminum powder for experiments each time, and evenly spread it on the ceramic column 2 of the constant-volume combustion projectile 1 to ensure full contact between the nano-aluminum powder and the ambient gas;

Step 2: According to the distribution ratio of the gas components required for the test, it is provided by the gas source 29, and after being fully mixed in the gas mixer 34, it is sent to the gas distribution chamber 36, and the temperature of the mixed gas at this time is fed back through the second thermocouple 17 After feeding the data acquisition system, the mixed gas is preliminarily heated and kept warm to the temperature value required by the test through the second heater 22 in the gas distribution chamber 36, and then filled into the constant volume incendiary bomb 1 to form the initial combustion gas atmosphere of the required pressure;

Step 3: Close all valves on the constant-volume incendiary bomb 1, and control the initial ambient pressure in the constant-volume incendiary bomb 1 by adjusting the sixth needle valve according to the initial bomb internal pressure required for the test, and conduct the test through the third pressure gauge 43 real time monitoring;

Step 4: According to the initial temperature value of the nano-aluminum powder burning according to the test requirements, the data acquisition system controls the time relay 9 and the adjustable transformer 8, and heats the nano-aluminum powder to the temperature required by the test by heating the heating wire 7;

Step 5: The data acquisition system controls the ignition high-voltage package 5 to work through the single-phase solid state relay 4, adjusts the output of the ignition high-voltage package 5 to the voltage value calculated according to the ignition energy requirements, and sets the ignition time; turn on the data acquisition system, and command the acquisition program Module, ready to collect the temperature and dynamic pressure inside the constant volume incendiary bomb 1;

Step 6: Control the single-phase solid state relay 4 to turn on, instruct the ignition circuit to start ignition, and at the same time start recording relevant temperature, dynamic pressure and other data in the combustion process through the data acquisition system, specifically to control the first thermocouple 13 to start collecting constant volume combustion The temperature changes in the bomb 1, the pressure sensor 15 is controlled to start collecting the pressure changes in the constant volume incendiary bomb 1, the laser source 10 emits laser light, and the flame image is recorded by the high-speed camera 12;

Step 7: When the combustion of the solid fuel ends, the data acquisition system controls the data acquisition to stop working. The scavenging system starts to work, and the first cock valve 24 of the exhaust system is opened, and the air compressor 23 starts to send fresh air into the gas distribution chamber 36 and the constant volume incendiary bomb 1 to sweep away residual waste gas.

The specific embodiments of the present utility model have been described above. It should be understood that the utility model is not limited to the above-mentioned specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the utility model.

Claims (10)

1. the constant volume combustion system that can be used for solid fuel ignition analysis and detect, it is characterized in that, comprise constant volume combustion bomb (1), firing system, flame image camera chain, data acquisition system (DAS), gas-heated heat-insulation system, scavenge system, gas mixing system, combination gas allocating system and exhaust system;

Wherein, described data acquisition system (DAS) connects described constant volume combustion bomb (1) respectively by described firing system, described flame image camera chain; Described data acquisition system (DAS) connects described constant volume combustion bomb (1) and described combination gas allocating system respectively by described gas-heated heat-insulation system; Described scavenge system connects described constant volume combustion bomb (1) and described combination gas allocating system; Described gas mixing system connects described combination gas allocating system; Described exhaust system connects described constant volume combustion bomb (1).

2. the constant volume combustion system that can be used for solid fuel ignition analysis and detect according to claim 1, it is characterized in that, described constant volume combustion bomb (1) comprises firebomb body and ceramics pole (2); Described ceramics pole (2) is arranged on inside described firebomb body.

3. the constant volume combustion system that can be used for solid fuel ignition analysis and detect according to claim 2, it is characterized in that, described gas mixing system comprises source of the gas (29), reduction valve (30), the second stopcock (32), the 3rd retaining valve (33), gas mixer (34) and the first tensimeter (31);

Wherein, the gas outlet of described source of the gas (29) is communicated with described gas mixer (34) by described reduction valve (30), described second stopcock (32), described 3rd retaining valve (33) successively;

Described first tensimeter (31) is arranged between described reduction valve (30) and described second stopcock (32).

4. the constant volume combustion system that can be used for solid fuel ignition analysis and detect according to claim 3, it is characterized in that, mixed gas allocating system comprises the 3rd needle-valve (35), gas dispensing room (36), the 4th retaining valve (37), the 4th needle-valve (38), the first safety valve (39), the 5th needle-valve (40) and the second tensimeter (41);

Described gas dispensing room (36) is communicated with by described 3rd needle-valve (35) at described gas mixer (34); The delivery outlet of described gas dispensing room (36) is communicated with described firebomb body by described 4th retaining valve (37), described 4th needle-valve (38) successively;

Described first safety valve (39) is communicated with described gas dispensing room (36); Described second tensimeter (41) connects described gas dispensing room (36) by described 5th needle-valve (40).

5. the constant volume combustion system that can be used for solid fuel ignition analysis and detect according to claim 4, it is characterized in that, described scavenge system comprises air compressor machine (23), the first stopcock (24), the first retaining valve (25), the first needle-valve (26), the second retaining valve (27) and the second needle-valve (28);

Wherein, the delivery outlet of described air compressor machine (23) is communicated with described firebomb body by the first stopcock (24), the first retaining valve (25), the first needle-valve (26) on the one hand successively, is communicated with described gas dispensing room (36) successively on the other hand by the first stopcock (24), the second retaining valve (27) with the second needle-valve (28).

6. the constant volume combustion system that can be used for solid fuel ignition analysis and detect according to claim 2, it is characterized in that, described exhaust system comprises the 6th needle-valve (42), the 3rd tensimeter (43), the second safety valve (44) and the 3rd stopcock (45);

Wherein, described 3rd tensimeter (43) is communicated with described firebomb body by described 6th needle-valve (42); Described second safety valve (44) is all communicated with described firebomb body with described 3rd stopcock (45).

7. the constant volume combustion system that can be used for solid fuel ignition analysis and detect according to claim 2, it is characterized in that, firing system comprises monophase solid relay (4), igniting high voltage package (5), high-energy igniter (6), heating heating wire (7), transtat (8) and the time relay (9);

Wherein, the data collecting card (3) of described data acquisition system (DAS) connects described igniting high voltage package (5), described high-energy igniter (6) successively by the switching circuitry of described monophase solid relay (4); Described high-energy igniter (6) is arranged on the upper periphery of described ceramics pole (2);

The data collecting card (3) of described data acquisition system (DAS) connects described transtat (8), heating heating wire (7) successively by the switching circuitry of the described time relay (9); Described heating heating wire (7) is arranged on the inner side of described ceramics pole (2) and the axis along described ceramics pole (2) extends.

8. the constant volume combustion system that can be used for solid fuel ignition analysis and detect according to claim 2, it is characterized in that, described flame image camera chain comprises lasing light emitter (10), catoptron (11) and high-speed camera (12);

Wherein, the data collecting card (3) of described data acquisition system (DAS) connected described high-speed camera (12); Described firebomb body is provided with multiple transparency window; The output terminal of described lasing light emitter (10) is towards a transparency window; The light reflection that another transparency window penetrates by described catoptron (11) is to the input end of described high-speed camera (12).

9. the constant volume combustion system that can be used for solid fuel ignition analysis and detect according to claim 4, it is characterized in that, gas-heated heat-insulation system comprises the first gas temperature controller (19), primary heater (20), the second gas temperature controller (21), secondary heater (22);

Wherein, the data collecting card (3) of described data acquisition system (DAS) connects described primary heater (20) by the first gas temperature controller (19) and connects described secondary heater (22) by described second gas temperature controller (21); Primary heater (20) is arranged on the inner side of firebomb body; Described secondary heater (22) is arranged on the inner side of described gas dispensing room (36).

10. the constant volume combustion system that can be used for solid fuel ignition analysis and detect according to claim 4, it is characterized in that, described data acquisition system (DAS) comprises data collecting card (3), the first thermopair (13), temperature transmitter (14), pressure transducer (15), signal isolator (16), the second thermopair (17) and temperature transmitter (18);

Wherein, described first thermopair (13) connects described data collecting card (3) by described temperature transmitter (14); Described pressure transducer (15) connects described data collecting card (3) by described signal isolator (16); Described second thermopair (17) connects described data collecting card (3) by described temperature transmitter (18);

Described first thermopair (13) and described pressure transducer (15) are arranged on the inner side of described firebomb body; Described second thermopair (17) is arranged on the inner side of described gas dispensing room (36).