A new multifunctional biomass suspension deflagration test bench

Abstract

The present invention discloses a novel multifunctional biomass suspended deflagration test bench, including a closed combustion chamber, in which an integrated temperature and pressure sensor is arranged, and an overhead camera and a laser concentration meter are arranged on the outside, which can monitor the suspended deflagration phenomenon. A hollow mushroom-shaped dispersion nozzle with a tray is provided at the bottom, and a gas mainstream channel located in the center and a gas baffle channel arranged around the gas mainstream channel are provided on the nozzle body. A mushroom-shaped baffle plate is provided above the nozzle body, and the gas mainstream channel extends upward to the mushroom-shaped baffle plate, and a vent hole is provided on the mushroom-shaped baffle plate at a position corresponding to the gas mainstream channel; the gas baffle channel is inclined outward from bottom to top and points to the mushroom-shaped baffle plate. The present invention can test the influence of different influencing factors on suspended deflagration, and can also test the changing law of pressure, temperature, flame and the propagation law of detonation wave during suspended deflagration, so as to explore the mechanism of biomass suspended deflagration.

Description

Technical Field

[0001] The invention belongs to the technical field of suspended combustion of biomass powder fuel, and in particular relates to a novel multifunctional biomass suspended deflagration test bench. Background Art

[0002] At present, the research on suspended combustion of biomass powder fuel mainly focuses on the design of suspended burners and suspended combustion boilers. The existing suspended burners mainly include: brick-built type, distributed heating type, etc. Through research, people have found that during the suspended combustion of biomass powder fuel, suspended deflagration and detonation phenomena will occur. Currently, the existing suspended burners and suspended combustion boilers are engineering equipment. They are unable to test the influence mechanism of factors such as temperature, concentration, humidity, particle size, gravity, etc. on suspended deflagration, and are unable to test the changing laws of pressure, temperature, flame, and the propagation law of detonation waves during suspended deflagration.

[0003] The invention of publication number CN104458805A discloses a coal powder suspension combustion characteristic test furnace for cement kiln, including an air source system, a hot air gun, an "L"-shaped quartz tube, a furnace body heating system, and a suspended furnace body temperature monitoring and acquisition system; the air source system provides air with suitable pressure and flow rate, which is introduced into the furnace body heating system from the "L"-shaped quartz tube after preheating by the hot air gun, so that the input coal powder burns in a suspended state, and the temperature change data of the coal powder combustion process is obtained through the suspended furnace body temperature monitoring and acquisition system, and the coal powder suspension combustion temperature change curve is drawn, and the combustion heat characteristics of the coal powder can be evaluated according to the curve. Compared with the general coal powder thermal analysis technology, when the required measurement temperature is reached and thermal equilibrium is reached, the present invention only takes about 10 minutes to complete the measurement and calculation of the sample to be tested, which is fast and convenient, with high accuracy, and continuous experiments can be carried out at the same time, and there is no need to wait for the temperature to drop to room temperature like thermogravimetric analysis, which can save a lot of time.

[0004] The utility model with announcement number CN201555843U discloses a test device for studying the combustion characteristics of coal powder in a suspended state, which is composed of a cylindrical tube connected downwardly to an inverted conical tube, which is connected to a gas pipeline at the constriction of the inverted conical tube, and is characterized in that an inverted Y-shaped feeding pipe is arranged at the gas outlet at the upper end of the cylindrical tube, and is extended to the middle of the cylindrical tube, and the inverted Y-shaped feeding pipe is made of quartz. The utility model has the advantages of simple structure, reliable performance, good experimental repeatability, extended residence time of coal powder, and is conducive to the formation of a suspended state.

[0005] However, the above-mentioned public technical solutions are all used for testing suspended combustion at normal pressure and cannot realize pressurized deflagration test. Summary of the invention

[0006] The purpose of the invention is to provide a novel multifunctional biomass suspension deflagration test bench.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A novel multifunctional biomass suspension deflagration test bench comprises a closed combustion chamber, a tray is provided at the bottom of the combustion chamber, a hollow mushroom-shaped dispersion nozzle is provided at the tray, and the hollow mushroom-shaped dispersion nozzle is externally connected to a test gas source;

[0009] The hollow mushroom-shaped dispersion nozzle includes a nozzle body, on which a gas mainstream channel is located in the center, and a gas deflection channel is arranged around the gas mainstream channel. A mushroom-shaped deflector is provided above the nozzle body, and the gas mainstream channel extends upward to the mushroom-shaped deflector, and air holes are provided on the mushroom-shaped deflector corresponding to the gas mainstream channel; the gas deflector is inclined outward from bottom to top and points to the mushroom-shaped deflector, and after the gas passes through the gas deflector, it is reflected by the mushroom-shaped deflector, and the reflected airflow blows up the biomass powder fuel on the tray.

[0010] The main gas flow channel is provided with threads.

[0011] The combustion chamber is a vertical columnar structure.

[0012] An adjustable base is connected below the combustion chamber, which includes a chassis located below the combustion chamber. A number of telescopic rods are arranged around the chassis. The telescopic rods are combined to form a frustum structure with a small top and a large bottom. The two ends of each telescopic rod are respectively connected to the combustion chamber and the chassis.

[0013] The combustion chamber is provided with a capacitive ignition device; and the combustion chamber is surrounded by a focused radiation heater on the side.

[0014] The combustion chamber is provided with integrated temperature and pressure sensors; the combustion chamber side is provided with a focused radiation heater, a laser concentration meter and / or a high-speed camera.

[0015] The test gas source includes an oxygen gas source and a combustible gas source, both of which are connected to the nozzle body of the hollow mushroom-shaped dispersion nozzle through a gas delivery pipeline.

[0016] The test gas source also includes a water vapor gas source, which is connected to a gas delivery pipeline.

[0017] Gas pressure regulators are arranged at the connection points of the oxygen gas source, combustible gas source and water vapor gas source with the gas delivery pipeline, and a solenoid valve is arranged on the gas delivery pipeline.

[0018] The combustion chamber is made of a quartz tube, which is installed on a bottom plate to form a closed combustion chamber; an explosion-proof plate is arranged on the quartz tube.

[0019] The beneficial effects of the present invention are:

[0020] 1. The novel multifunctional biomass suspended deflagration test bench of the present invention can test the effects of different influencing factors on suspended deflagration, and can also test the changing laws of pressure, temperature, flame and propagation laws of detonation waves during suspended deflagration, and find out the mechanism of biomass suspended deflagration. At the same time, the test bench can also test the mixed combustion of biomass powder fuel and combustible gas, find out the mixed combustion mechanism of biomass powder fuel and combustible gas, and provide data support for the design of mixed combustion equipment of biomass powder fuel and combustible gas.

[0021] 2. The present invention designs a hollow mushroom-shaped dispersion nozzle. The gas is diverted after passing through the hollow mushroom-shaped dispersion nozzle. A part of the gas passes through the gas deflection channel and is reflected by the mushroom-shaped deflector. The reflected airflow blows up the biomass powder fuel on the tray to disperse the powder fuel; a part of the gas passes through the gas mainstream channel and carries the dispersed biomass powder fuel forward.

[0022] The present invention has threads in the gas mainstream channel, which can perform spiral disturbance on the gas, carry the dispersed biomass powder fuel forward in a spiral, and make the spirally forwarded biomass powder fuel evenly distributed in the combustion chamber.

[0023] 3. The present invention uses a capacitor ignition device for ignition. The capacitor ignition device can quantitatively test the ignition energy by adjusting the amount of electricity stored in the capacitor to explore the effect of the ignition energy on the deflagration of biomass suspension.

[0024] The present invention arranges an integrated temperature and pressure sensor in the combustion chamber, which can measure the temperature and pressure at different positions in the direction. The data is collected and stored through an information acquisition device, and the temperature change law and pressure propagation law in the suspended deflagration process can be explored.

[0025] The present invention arranges a focused radiation heater on the side of the combustion chamber, and the temperature can be controlled by adjusting the current to test the influence of different temperatures on the deflagration of biomass suspension.

[0026] The present invention arranges a laser concentration meter on the side of the combustion chamber to test the dispersion of biomass powder fuel under different wind speeds; a high-speed camera is also arranged on the side, and the high-speed camera can test the flame propagation law of suspended deflagration by collecting images at a high frequency.

[0027] 4. An adjustable base is connected below the combustion chamber of the present invention. The adjustable base includes a chassis located below the combustion chamber. A plurality of telescopic rods are arranged around the chassis. The telescopic rods are combined to form a truncated cone structure with a small top and a large bottom. The two ends of each telescopic rod are respectively connected to the combustion chamber and the chassis. The angle of the explosion-proof quartz tube can be adjusted through the adjustable base to test the influence of the gravity field on the distribution of biomass powder fuel and the propagation law of deflagration flames in different directions.

[0028] 5. The test gas source of the present invention includes an oxygen gas source and a combustible gas source. The oxygen or air is opened by a solenoid valve, and the amount of gas introduced can be adjusted to quantitatively control the ambient oxygen concentration, and the effect of oxygen concentration on suspended deflagration is tested.

[0029] The test gas source of the present invention also includes a water vapor gas source. By adjusting the amount of water vapor introduced into the quartz tube, the environmental humidity can be changed to test the effect of humidity on suspended deflagration and explore the effect of humidity on suspended deflagration.

[0030] 6. The combustion chamber of the present invention uses a quartz tube, and an explosion-proof plate with a pressure resistance lower than that of the explosion-proof quartz tube is installed on the quartz tube to form an explosion-proof quartz tube; when the suspended deflagration occurs too violently, the explosion-proof plate will rupture before the quartz tube explodes to achieve the purpose of pressure relief, prevent the quartz tube from exploding, and avoid the occurrence of safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of the present invention;

[0032] Figure 2 It is a schematic diagram of the hollow mushroom-shaped dispersion nozzle and the tray in the present invention;

[0033] Figure 3 is a schematic diagram of a hollow mushroom-shaped dispersion nozzle in the present invention;

[0034] Figure 4 yes Figure 3 B-B view in;

[0035] Figure 5 It is a schematic diagram of the focused radiation heater in the present invention. DETAILED DESCRIPTION

[0036] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings.

[0037] like Figures 1 to 5As shown, a novel multifunctional biomass suspension deflagration test bench of the present invention comprises a quartz tube 1, and an explosion-proof plate 14 with a pressure resistance lower than that of an explosion-proof quartz tube is installed on the top of the quartz tube 1 to form an explosion-proof quartz tube. When the suspension deflagration occurs too violently, the explosion-proof plate will rupture before the quartz tube explodes to achieve the purpose of pressure relief, prevent the quartz tube from exploding, and avoid the occurrence of safety accidents.

[0038] The quartz tube 1 is mounted on the bottom plate, and the quartz tube 1 and the bottom plate are sealed by a sealing rubber gasket 15, so that a closed combustion chamber is formed in the quartz tube, and a vertical columnar structure of the combustion chamber is realized. A tray 64 is provided at the bottom of the combustion chamber. A hollow mushroom-shaped dispersion nozzle 6 is provided at the tray, and the hollow mushroom-shaped dispersion nozzle 6 is connected to the test gas source.

[0039] The hollow mushroom-shaped dispersion nozzle includes a nozzle body, on which is provided a gas mainstream channel 62 located in the center, and a gas deflection channel 63 arranged around the gas mainstream channel 32, and a mushroom-shaped deflector 61 is provided above the nozzle body. The gas mainstream channel 62 extends upward to the mushroom-shaped deflector 61 and is connected thereto, and air holes are provided on the mushroom-shaped deflector 61 at positions corresponding to the gas mainstream channel 62; the gas deflection channel 63 is inclined outward from bottom to top and points to the mushroom-shaped deflector 61.

[0040] The gas is diverted after passing through the hollow mushroom-shaped dispersion nozzle. A part of the gas passes through the gas deflection channel 63 and is reflected by the mushroom-shaped deflector 61. The reflected airflow blows up the biomass powder fuel on the tray 64 to disperse the powder fuel; a part of the gas passes through the gas mainstream channel 62 and carries the dispersed biomass powder fuel forward.

[0041] The gas main flow channel 62 is also provided with threads, which can perform spiral disturbance on the gas, carry the dispersed biomass powder fuel forward in a spiral, and make the spirally forward biomass powder fuel evenly distributed in the combustion chamber.

[0042] In this embodiment, an adjustable base 7 is connected to the bottom of the quartz tube 1. The adjustable base includes a chassis located below the quartz tube 1. A plurality of telescopic rods are arranged around the chassis. The telescopic rods are combined to form a frustum structure that is small on the top and large on the bottom. The two ends of each telescopic rod are respectively connected to the chassis and the bottom plate of the quartz tube 1.

[0043] In this embodiment, six telescopic rods are provided to form a six-degree-of-freedom adjustable base. The angle of the explosion-proof quartz tube can be adjusted by adjusting the length combination of the telescopic rods to test the influence of the gravity field on the distribution of biomass powder fuel and the propagation law of deflagration flames in different directions.

[0044] A capacitive ignition device 5 is provided in the quartz tube 1, and ignition is performed by the capacitive ignition device 5. The capacitive ignition device 5 can quantitatively test the ignition energy by adjusting the amount of electricity stored in the capacitor, and explore the influence of the ignition energy on the deflagration of biomass suspension.

[0045] An integrated temperature and pressure sensor 2 is arranged in the quartz tube 1, which can measure the temperature and pressure at different positions in the direction. The data is collected and stored through the information acquisition device, which can explore the temperature change law and pressure propagation law during the suspended deflagration process.

[0046] The quartz tube 1 is surrounded by a focused radiation heater 3 on its side, and the temperature can be controlled by adjusting the current to test the effect of different temperatures on the deflagration of biomass suspension.

[0047] A laser concentration meter (including a laser transmitter and a laser receiver) is arranged on the side of the quartz tube 1 to test the dispersion of biomass powder fuel under different wind speeds; a high-speed camera is also arranged on the side to test the flame propagation law of suspended deflagration by collecting images at a high frequency.

[0048] In this embodiment, the test gas source includes an oxygen gas source 10 and a combustible gas source 11, both of which are connected to the nozzle body of the hollow mushroom-shaped dispersion nozzle 5 through a gas delivery pipeline. The test gas source also includes a water vapor gas source 12, which is connected to the gas delivery pipeline through a three-way valve.

[0049] Gas pressure regulators 9 are provided at the connection points of the oxygen gas source 10 , the combustible gas source 11 , the water vapor gas source 12 and the gas delivery pipeline, and a solenoid valve 13 is provided on the gas delivery pipeline.

[0050] During operation, oxygen or air is opened through the electromagnetic valve 8, and the amount of gas introduced can be adjusted to quantitatively control the ambient oxygen concentration, and the effect of oxygen concentration on suspended deflagration can be tested. In addition, by adjusting the amount of water vapor introduced into the quartz tube, the ambient humidity can be changed, and the effect of humidity on suspended deflagration can be tested to explore the effect of humidity on suspended deflagration.

[0051] The present invention also includes an information collection device for collecting test information of the integrated temperature and pressure sensor 2, the focused radiation heater 3, the capacitive ignition device 5, the laser concentration meter and the high-speed camera.

[0052] The working principle of the present invention is as follows:

[0053] After the biomass powder fuel is screened, the particle size of the biomass powder fuel is divided, and a certain amount of biomass powder fuel with a certain particle size is weighed and placed on the tray 64 under the new hollow mushroom-shaped dispersion nozzle 6. Oxygen or air is controlled to open by the solenoid valve, and the amount of gas introduced can be adjusted, the ambient oxygen concentration can be quantitatively controlled, and the effect of oxygen concentration on suspended deflagration is tested. The gas is diverted after passing through the new hollow mushroom-shaped dispersion nozzle 6. After a part of the gas passes through the gas deflection channel 63, it is reflected by the deflector, and the reflected airflow blows up the biomass powder fuel on the tray 64 to disperse the powder fuel; a part of the gas passes through the gas mainstream channel 62. Since there is a thread in the gas mainstream channel 62, the gas can be spirally disturbed, and the dispersed biomass powder fuel is carried forward in a spiral.

[0054] The spirally advancing biomass powder fuel is evenly distributed in the explosion-proof quartz tube and can be ignited by a capacitive ignition device.

[0055] The novel multifunctional biomass suspension deflagration test bench of the present invention can realize the following tests:

[0056] (1) The test bench is equipped with a focused radiation heater, which can test the effect of temperature on suspended deflagration;

[0057] (2) The test bench is connected to oxygen gas source, combustible gas source and water vapor gas source through a three-way valve, which can test the effect of humidity on suspended deflagration, and can also test the mixed combustion of biomass powder fuel and combustible gas;

[0058] (3) A capacitive ignition device is installed in the quartz tube of the test bench, which can test the effect of ignition energy on suspended deflagration;

[0059] (4) The test bench is equipped with integrated temperature and pressure sensors in the quartz tube, which can measure the temperature and pressure at different positions in the direction and test the temperature change and pressure propagation during the suspended deflagration process;

[0060] (5) The test bench is equipped with a telescopic support rod on the side. By adjusting the angle of the quartz tube, the propagation of suspended deflagration pressure and temperature in different directions can be tested;

[0061] (6) The test bench is equipped with a laser concentration meter to test the dispersion of biomass powder fuel under different wind speeds;

[0062] (7) The test bench is equipped with a high-speed camera, which can test the flame propagation law of suspended deflagration by collecting images at a high frequency.

[0063] The novel multifunctional biomass suspended deflagration test bench of the present invention can test the effects of different influencing factors on suspended deflagration, and can also test the changing laws of pressure, temperature, flame and propagation laws of detonation waves during suspended deflagration, and find out the mechanism of biomass suspended deflagration. At the same time, the test bench can also test the mixed combustion of biomass powder fuel and combustible gas, find out the mixed combustion mechanism of biomass powder fuel and combustible gas, and provide data support for the design of mixed combustion equipment of biomass powder fuel and combustible gas.

[0064] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

[0065] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the protection content of the present invention.

Claims

1. A new multifunctional biomass suspension deflagration test bench, characterized by: It includes a closed combustion chamber, a tray is provided at the bottom of the combustion chamber, a hollow mushroom-shaped dispersion nozzle is provided at the tray, and the hollow mushroom-shaped dispersion nozzle is externally connected to a test gas source; The hollow mushroom-shaped dispersion nozzle comprises a nozzle body, on which a gas mainstream channel is located in the center, and a gas baffle channel is arranged around the gas mainstream channel, a mushroom-shaped baffle plate is arranged above the nozzle body, the gas mainstream channel extends upward to the mushroom-shaped baffle plate, and a vent hole is arranged on the mushroom-shaped baffle plate at a position corresponding to the gas mainstream channel; the gas baffle channel is inclined outward from bottom to top and points to the mushroom-shaped baffle plate, and after the gas passes through the gas baffle channel, it is reflected by the mushroom-shaped baffle plate, and the reflected airflow blows up the biomass powder fuel on the tray; The main gas flow channel is provided with threads; The combustion chamber is a vertical columnar structure.

2. The novel multifunctional biomass suspension deflagration test bench according to claim 1 is characterized by: An adjustable base is connected below the combustion chamber, which includes a chassis located below the combustion chamber. A number of telescopic rods are arranged around the chassis. The telescopic rods are combined to form a frustum structure with a small top and a large bottom. The two ends of each telescopic rod are respectively connected to the combustion chamber and the chassis.

3. The novel multifunctional biomass suspension deflagration test bench according to claim 1 or 2 is characterized in that: The combustion chamber is provided with a capacitive ignition device; and the combustion chamber is surrounded by a focused radiation heater on the side.

4. The novel multifunctional biomass suspension deflagration test bench according to claim 3 is characterized by: The combustion chamber is provided with integrated temperature and pressure sensors; the combustion chamber side is provided with a focused radiation heater, a laser concentration meter and / or a high-speed camera.

5. The novel multifunctional biomass suspension deflagration test bench according to claim 1 or 2 is characterized in that: The test gas source includes an oxygen gas source and a combustible gas source, both of which are connected to the nozzle body of the hollow mushroom-shaped dispersion nozzle through a gas delivery pipeline.

6. The novel multifunctional biomass suspension deflagration test bench according to claim 5 is characterized by: The test gas source also includes a water vapor gas source, which is connected to a gas delivery pipeline.

7. The novel multifunctional biomass suspension deflagration test bench according to claim 6 is characterized by: Gas pressure regulators are arranged at the connection points of the oxygen gas source, combustible gas source and water vapor gas source with the gas delivery pipeline, and a solenoid valve is arranged on the gas delivery pipeline.

8. The novel multifunctional biomass suspension deflagration test bench according to claim 1 or 2 is characterized by: The combustion chamber is made of a quartz tube, which is installed on a bottom plate to form a closed combustion chamber; an explosion-proof plate is arranged on the quartz tube.

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