Experimental device for forced convection downward flying fire particle combustion

Abstract

The invention discloses an experimental device for forced convection flow flying fire particle combustion, and relates to the field of forest fire scientific research. The experimental device for forcing convection flow flying fire particle combustion comprises a stainless steel wind tunnel pipeline, a propane heater and wood particle fuel. The left side face of the stainless steel wind tunnel pipeline A is connected with a frequency-adjustable jet-type fan, the left side face and the right side face of the frequency-adjustable jet-type fan are connected with stainless steel fan inlet and outlet ends B, and the right side face of the stainless steel fan inlet and outlet ends B is connected with a damping net. According to the experimental device for forced convection flying fire particle combustion, three layers of damping nets and two layers of stainless steel honeycomb rectifying plates are arranged in a stainless steel wind tunnel pipeline, the wind speed of a jet type fan is adjusted through a frequency converter, particles are fixed to particle fixing nails, a rotating device is started, and flying fire particle fuel is heated and ignited through a propane heater; and uniform heating of the flying fire particles is realized.

Description

Technical Field

[0001] The invention relates to the technical field of forest fire scientific research, in particular to an experimental device for the combustion of flying fire particles under forced convection. Background Art

[0002] The experimental device for the combustion of flying fire particles is one of the experimental devices for studying forest fires. The device combines infrared thermal imagers, high-precision balances, hot wire anemometers, digital cameras and other experimental instruments to measure important parameters such as temperature, mass, wind speed, and particle cross-sectional area during the combustion of flying fire particles. In the specific experiment of this device, the wind speed of the jet fan is adjusted by the frequency converter, the particles are fixed on the particle fixing nails, and after the rotating device is turned on, the propane heater is used to evenly heat and ignite the flying fire particles.

[0003] At present, there is a lack of experimental research on the combustion of flying fire particles under forced convection. When the experimental device is used for particle combustion, due to the existence of wind speed and the small size of the flying fire particles, it is difficult to fix the particles and achieve uniform heating of the particles. The accurate measurement of important parameters in the experiment is very challenging. Therefore, there is a lack of experimental devices for the combustion of flying fire particles under forced convection. Summary of the invention

[0004] In order to make up for the deficiencies of the prior art, the embodiments of the present application propose an experimental device for the combustion of flying fire particles under forced convection to solve the problems existing in the prior art.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] An experimental device for the combustion of flying fire particles under forced convection includes three parts: a stainless steel wind tunnel duct, a propane heater and wood pellet fuel. The left side of the stainless steel wind tunnel duct is connected to a jet fan with adjustable frequency, the left and right sides of the jet fan with adjustable frequency are connected to the inlet and outlet ends of the stainless steel fan, the right side of the inlet and outlet ends of the stainless steel fan is connected to a damping net, the damping net is connected and fixed to the stainless steel wind tunnel duct through a damping net fixing bolt, the stainless steel honeycomb rectifier plate on the right side of the damping net is connected and fixed to the stainless steel wind tunnel duct through a stainless steel honeycomb rectifier plate fixing bolt, the inlet and outlet ends of the stainless steel fan are connected and fixed to the wind tunnel support platform through a fixing bracket, the right side of the fixing bracket has two fixing bracket screw holes, and the jet fan with adjustable frequency is connected to a frequency converter;

[0007] The propane heater is connected and fixed to the metal bracket through a propane heater fixing bolt, the main body of the propane heater fixing bolt is a metal block with a screw hole, and the propane heater fixing bolt clamps the propane heater metal rod;

[0008] The wood particle fuel is fixed to a particle fixing nail, the bottom of the particle fixing nail is connected to the particle fixing bolt through a particle fixing bolt screw, the bottom of the particle fixing bolt is connected to a metal disc, the bottom of the metal disc is connected to a rotating device, the side of the rotating device is connected to a frequency adjustment knob, the bottom of the rotating device is connected to a lifting platform, and the bottom of the lifting platform is connected to a particle support platform.

[0009] As a preferred embodiment of the present invention, there are two fixing bracket screw holes on the right side of the fixing bracket, and the fixing bracket screw holes are provided with fixing screw holes corresponding to the positions of the wind tunnel support platform. The fixing bracket screw holes and the fixing screw holes are screwed in and fixed by fixing screws, and the fixing bracket is welded to the inlet and outlet ends of the stainless steel fan.

[0010] As a preferred embodiment of the present invention, the stainless steel wind tunnel duct is used in conjunction with a damping net fixing bolt and a stainless steel honeycomb rectifier plate fixing bolt, the frequency-adjustable jet fan adjusts the wind speed through a frequency converter, and the stainless steel wind tunnel duct and the damping net fixing bolt are made of stainless steel.

[0011] As a preferred embodiment of the present invention, propane heater fixing bolt screw one is screwed into the left side of the screw hole metal block, and propane heater fixing bolt screw two is screwed into the right side of the screw hole metal block, and the surface of the middle connection of the screw hole metal block is the anti-slip metal inner wall of the propane heater fixing bolt.

[0012] As a preferred embodiment of the present invention, the particle fixing nails are divided into needle-shaped particle fixing nails and straight-cylindrical particle fixing nails, the interior of the particle fixing bolt is a particle fixing bolt anti-slip metal inner wall, the particle fixing bolt screw is screwed into the right side of the particle fixing bolt, the rotating device adjusts the rotation speed by rotating the frequency adjustment knob, the lifting platform can manually adjust the height, and the particle fixing nails and particle fixing bolts are both made of metal.

[0013] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0014] 1. The present invention adjusts the wind speed by adjusting the frequency converter to adjust the jet fan, can obtain a relatively ideal stable wind speed through three layers of damping nets and two layers of stainless steel honeycomb rectifier plates, fixes the wood pellet fuel through particle fixing nails and particle fixing bolts, rotates the wood pellet fuel through a rotating device, and turns on the propane heater to evenly heat and ignite the wood pellet fuel.

[0015] 2. The present invention can make the wind tunnel run smoothly and avoid vibration and position movement of the stainless steel wind tunnel pipeline by screwing the fixing screws into the fixing screw holes of the fixing bracket and welding the fixing bracket to the inlet and outlet ends of the stainless steel fan.

[0016] 3. The present invention uses a stainless steel wind tunnel pipe in conjunction with a damping net fixing bolt and a stainless steel honeycomb rectifier plate fixing bolt. The stainless steel wind tunnel pipe and the damping net fixing bolt are made of stainless steel, which can obtain a stable wind speed, prevent the device from rusting, and greatly increase the service life of the device.

[0017] 4. In the present invention, screw one of the propane heater fixing bolts is screwed into the left side of the screw hole metal block, and screw two of the propane heater fixing bolts is screwed into the right side of the screw hole metal block. The surface of the middle connection of the screw hole metal block is the anti-slip metal inner wall of the propane heater fixing bolt, which can stably fix the propane heater. The propane heating fixing bolt can adjust the rotation of the propane heater along its own long axis and the metal bracket in two directions. The propane heating fixing bolt can adjust the upper and lower heights of the propane heater along the metal bracket.

[0018] 5. The present invention manually adjusts the height of the lifting platform by screwing in the particle fixing screw on the right side of the particle fixing screw. The particle fixing nails are divided into needle-shaped particle fixing nails and straight-cylindrical particle fixing nails, and the interior of the particle fixing nails is a metal inner wall with anti-slip patterns on the particle fixing nails. The particle fixing nails and the particle fixing bolts are both made of metal and can fix particles of different sizes. Larger particles can be fixed on the straight-cylindrical particle fixing nails by punching, and the lifting platform can flexibly adjust the height position of the particles.

[0019] 6. The present invention screws the damping mesh fixing bolt screw into the left side of the damping mesh groove metal block, screws the damping mesh fixing bolt nut into the right side of the damping mesh groove metal block, and the damping mesh groove metal block has a damping mesh groove inside, and the stainless steel honeycomb rectifier plate fixing bolt body is a stainless steel honeycomb rectifier plate groove metal block, and the stainless steel honeycomb rectifier plate fixing bolt has a stainless steel honeycomb rectifier plate groove inside. The position of the stainless steel honeycomb rectifier plate can be fixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 For the present invention Figure 1 Right view of the middle outlet structure;

[0022] Figure 3 An enlarged front view and a top view of the fixing bolt structure of a propane heater of the present invention;

[0023] Figure 4 It is a three-dimensional diagram of the particle fixing nail, particle fixing plug and metal disc structure of the present invention;

[0024] Figure 5 This is an enlarged view of the damping net fixing bolt and the stainless steel honeycomb rectifier plate fixing bolt structure of the present invention;

[0025] Figure 6These are the front view, left view and top view of the fixing bracket structure of the present invention.

[0026] In the figure: 1. Adjustable frequency jet fan; 2. Propane heater; 3. Wood pellet fuel; 4. Inverter; 5. Fixed bracket; 6. Wind tunnel support platform; 7. Damping net fixing bolt; 8. Damping net; 9. Stainless steel honeycomb rectifier plate fixing bolt; 10. Stainless steel honeycomb rectifier plate; 11. Propane heater fixing bolt; 12. Metal bracket; 13. Particle fixing nail; 14. Particle fixing bolt; 15. Rotating device; 16. Lifting platform; 17. Particle support platform; 18. Frequency adjustment knob; 19. Propane heater fixing bolt screw 1; 20. Screw hole metal block; 21. Propane heater metal rod; 22. Propane Heater fixing bolt screw 2; 23, propane heater fixing bolt anti-skid metal inner wall; 24, needle-shaped particle fixing nail; 25, straight-tube particle fixing nail; 26, particle fixing bolt screw; 27, particle fixing bolt anti-skid metal inner wall; 28, metal disc; 29, damping net fixing bolt screw; 30, damping net fixing bolt nut; 31, damping net groove metal block; 32, damping net groove; 33, stainless steel honeycomb rectifier plate groove metal block; 34, stainless steel honeycomb rectifier plate groove; 35, fixing bracket screw hole; 36, fixing screw hole; 37, fixing screw; A, stainless steel wind tunnel duct; B, stainless steel fan inlet and outlet. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Embodiment 1, as Figure 1As shown, an experimental device for the combustion of flying fire particles under forced convection, an experimental device for the combustion of flying fire particles under forced convection, includes three parts: a stainless steel wind tunnel pipe A, a propane heater 2 and a wood particle fuel 3. The left side of the stainless steel wind tunnel duct A is connected to the frequency-adjustable jet fan 1, and the left and right sides of the frequency-adjustable jet fan 1 are connected to the stainless steel fan inlet and outlet B. The right side of the stainless steel fan inlet and outlet B is connected to the damping net 8, and the damping net 8 is connected and fixed to the stainless steel wind tunnel duct A through the damping net fixing bolt 7. The stainless steel honeycomb rectifier plate 10 on the right side of the damping net 8 is connected and fixed to the stainless steel wind tunnel duct A through the stainless steel honeycomb rectifier plate fixing bolt 9. The main body of the damping net fixing bolt 7 is a damping net groove metal block 31. The stainless steel fan inlet and outlet B is connected and fixed to the wind tunnel support platform 6 through a fixing bracket 5. There are two fixing bracket screw holes 35 on the right side of the fixing bracket 5. The fixing bracket screw holes 35 are provided with fixing screw holes 36 corresponding to the position of the wind tunnel support platform 6. The fixing bracket screw holes 35 and the fixing screw holes 36 are screwed in and fixed by fixing screws 37. The fixing bracket 5 is welded to the stainless steel fan inlet and outlet B. The frequency-adjustable jet fan 1 is connected to the frequency converter 4, and the wind speed of the jet fan is adjusted by the frequency converter 4. The propane heater 2 is connected and fixed to the metal bracket 12 through a propane heater fixing bolt 11. The main body of the propane heater fixing bolt 11 is a metal block 20 with a screw hole. The surface of the middle connection of the metal block 20 with a screw hole is a metal inner wall 23 with an anti-slip pattern of the propane heater fixing bolt. The propane heater fixing bolt 11 clamps the propane heater metal rod 21; the wood particle fuel 3 is fixed to the particle fixing nail 13, the bottom of the particle fixing nail 13 is connected to the particle fixing bolt 14 through a particle fixing bolt screw 26, the particle fixing nail 13 is divided into a needle-shaped particle fixing nail 24 and a straight-cylinder particle fixing nail 25, the rotating device 15 adjusts the rotation speed by rotating the frequency adjustment knob 18, the lifting platform 16 can manually adjust the height, the particle fixing nail 13 and the particle fixing bolt 14 are both made of metal, the bottom of the particle fixing bolt 14 is connected to a metal disc 28, the bottom of the metal disc 28 is connected to the rotating device 15, the side of the rotating device 15 is connected to the frequency adjustment knob 18, the bottom of the rotating device 15 is connected to the lifting platform 16, and the bottom of the lifting platform 16 is connected to the particle support platform 17.

[0029] refer to Figure 1 , adjust the frequency converter 4 to adjust the jet fan 1 to adjust the wind speed, the stainless steel wind tunnel duct A is used in conjunction with the damping net fixing bolt 7 and the stainless steel honeycomb rectifier plate fixing bolt 9, the stainless steel wind tunnel duct A and the damping net fixing bolt 7 are made of stainless steel, and the height of the lifting platform 16 is manually adjusted.

[0030] Example 2, based on Example 1, a relatively ideal stable wind speed can be obtained through three layers of damping nets 8 and two layers of stainless steel honeycomb rectifier plates 10, which prevents the device from rusting, greatly increases the service life of the device, and the lifting platform can flexibly adjust the height position of the particles.

[0031] refer to Figure 2 The rotating device 15 rotates the wood pellet fuel 3, and the frequency adjustment knob 18 is used to adjust the speed of the rotating device.

[0032] Example 3, based on Example 2, the propane heater 2 is turned on to evenly heat and ignite the wood pellet fuel 3.

[0033] refer to Figure 3 , screw one propane heater fixing bolt screw 19 into the left side of the screw hole metal block 20, and screw two propane heater fixing bolt screw 22 into the right side of the screw hole metal block 20.

[0034] Embodiment 4, on the basis of embodiment 3, the surface at the middle connection of the screw hole metal block 20 is the anti-slip metal inner wall 23 of the propane heater fixing bolt, which can stably fix the propane heater 2, and the propane heating fixing bolt 11 can adjust the rotation of the propane heater 2 along its own long axis and the metal bracket, and the propane heating fixing bolt 11 can adjust the up and down height of the propane heater 2 along the metal bracket.

[0035] refer to Figure 4 The particle fixing nail 13 and the particle fixing bolt 14 fix the wood particle fuel 3, the particle fixing bolt screw 26 is screwed into the right side of the particle fixing bolt 14, and the particle fixing nail 13 is divided into a needle-shaped particle fixing nail 24 and a straight-cylindrical particle fixing nail 25, and the inside of the particle fixing bolt 14 is a particle fixing bolt anti-slip metal inner wall 27.

[0036] Example 5, based on Example 4, can fix particles of different sizes, and larger particles can be fixed on the straight cylindrical particle fixing nails 25 by punching.

[0037] refer to Figure 5 The damping mesh groove metal block 31 has a damping mesh fixing bolt screw 29 screwed into the left side thereof, and the damping mesh fixing bolt nut 30 screwed into the right side thereof, and the damping mesh groove metal block 31 has a damping mesh groove 32 inside thereof, and the main body of the stainless steel honeycomb rectifier plate fixing bolt 9 is a stainless steel honeycomb rectifier plate groove metal block 33, and the stainless steel honeycomb rectifier plate fixing bolt 9 has a stainless steel honeycomb rectifier plate groove 34 inside thereof.

[0038] Embodiment 6, based on Embodiment 5, can achieve stable fixing of the positions of the damping net 8 and the stainless steel honeycomb rectifier plate 10.

[0039] refer to Figure 6 The fixing screws 37 are screwed into the fixing screw holes 35 and 36 of the fixing bracket, and the fixing bracket 5 is welded to the inlet and outlet ends B of the stainless steel fan.

[0040] It can make the wind tunnel run smoothly and avoid vibration and position movement of the stainless steel wind tunnel pipe.

[0041] The working principle and use process of the present invention are as follows: when in use, the wind speed of the jet fan 1 is adjusted by the frequency converter 4, the particle fixing nail 13 is fixed on the metal disc 28 through the particle fixing bolt 14, the wood particle fuel 3 is fixed on the particle fixing nail 13, when the wood particle fuel 3 is small, it is directly fixed on the needle-shaped particle fixing nail 24, when the wood particle fuel 3 is large, the wood particle fuel 3 is drilled with a drilling machine, the hole size is equal to the diameter of the straight-cylindrical particle fixing nail 25, and the wood particle fuel 3 is fixed on the straight-cylindrical particle fixing nail 25 after drilling, the rotating device 15 is turned on, the rotating speed of the rotating device 15 is adjusted by the frequency adjustment knob 18, the height of the lifting platform 16 is manually adjusted, and the propane heater 2 is turned on to heat and ignite the wood particle fuel 3. It can achieve uniform heating of the wood particle fuel 3, and it is more ideal to carry out the combustion experiment of flying fire particles under forced convection.

[0042] In summary: the experimental device for the combustion of flying fire particles under forced convection, adjusting the frequency converter 4 to adjust the jet fan 1 to adjust the wind speed, through the three-layer damping net 8 and the two-layer stainless steel honeycomb rectifier plate 10 can obtain a relatively ideal stable wind speed; the propane heater fixing bolt 11 can make the propane heater 2 be stably fixed, the propane heating fixing bolt 11 can adjust the propane heater 2 to rotate along its own long axis and the metal bracket in two directions, and the propane heating fixing bolt 11 can adjust the upper and lower heights of the propane heater 2 along the metal bracket; the particle fixing nail 13 and the particle fixing bolt 14 fix the wood particle fuel 3, can fix particles of different sizes, and larger particles can be fixed on the straight cylindrical particle fixing nail 25 by punching; the rotating device 15 rotates the wood particle fuel 3, and the frequency adjustment knob 18 is used to adjust the speed of the rotating device, and the lifting platform can flexibly adjust the height position of the particles; turn on the propane heater 2, which can evenly heat and ignite the wood particle fuel 3; the fixing screw 37 is screwed into the fixing bracket screw hole 35 and the fixing screw hole 36, and the fixing bracket 5 is welded with the stainless steel fan inlet and outlet B, which can make the wind tunnel run smoothly and avoid vibration and position movement of the stainless steel wind tunnel pipeline.

[0043] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0044] In addition, it should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment have also been appropriately combined to form other implementation modes that are easy for those skilled in the art to understand.

Claims

1. An experimental device for the combustion of flying fire particles under forced convection, comprising a stainless steel wind tunnel duct, a propane heater (2) and wood pellet fuel (3), characterized in that: The left side of the stainless steel wind tunnel duct is connected to an adjustable frequency jet fan (1), the left and right sides of the adjustable frequency jet fan (1) are connected to the stainless steel fan inlet and outlet ends, the right side of the stainless steel fan inlet and outlet ends are connected to a damping net (8), the damping net (8) is connected and fixed to the stainless steel wind tunnel duct via a damping net fixing bolt (7), the stainless steel honeycomb rectifier plate (10) on the right side of the damping net (8) is connected and fixed to the stainless steel wind tunnel duct via a stainless steel honeycomb rectifier plate fixing bolt (9), the stainless steel fan inlet and outlet ends are connected and fixed to the wind tunnel support platform (6) via a fixing bracket (5), the fixing bracket (5) has two fixing bracket screw holes (35) on the right side, and the adjustable frequency jet fan (1) is connected to a frequency converter (4); The propane heater (2) is connected and fixed to the metal bracket (12) via a propane heater fixing bolt (11); the main body of the propane heater fixing bolt (11) is a metal block (20) with a screw hole; the propane heater fixing bolt (11) clamps the propane heater metal rod (21); The wood pellet fuel (3) is fixed to a pellet fixing nail (13); the bottom of the pellet fixing nail (13) is connected to a pellet fixing bolt (14) via a pellet fixing bolt screw (26); the bottom of the pellet fixing bolt (14) is connected to a metal disc (28); the bottom of the metal disc (28) is connected to a rotating device (15); the side of the rotating device (15) is connected to a frequency adjustment knob (18); the bottom of the rotating device (15) is connected to a lifting platform (16); and the bottom of the lifting platform (16) is connected to a pellet support platform (17).

2. The experimental device for flying fire particle combustion under forced convection according to claim 1 is characterized in that: The wood pellet fuel (3) is fixed on a pellet fixing nail (13); the bottom of the pellet fixing nail (13) is connected to a pellet fixing bolt (14) via a pellet fixing bolt screw (26); the bottom of the pellet fixing bolt (14) is connected to a metal disc (28); the bottom of the metal disc (28) is connected to a rotating device (15); the side of the rotating device (15) is connected to a frequency adjustment knob (18); the bottom of the rotating device (15) is connected to a lifting platform (16); and the bottom of the lifting platform (16) is connected to a pellet support platform (17).

3. The experimental device for flying fire particle combustion under forced convection according to claim 2, characterized in that: The stainless steel wind tunnel duct is used in conjunction with a damping net fixing bolt (7) and a stainless steel honeycomb rectifier plate fixing bolt (9); the frequency-adjustable jet fan (1) adjusts the wind speed via a frequency converter (4); and the stainless steel wind tunnel duct and the damping net fixing bolt (7) are made of stainless steel.

4. The experimental device for flying fire particle combustion under forced convection according to claim 2, characterized in that: The first propane heater fixing bolt screw (19) is screwed into the left side of the screw hole metal block (20), and the second propane heater fixing bolt screw (22) is screwed into the right side of the screw hole metal block (20). The surface of the middle connection of the screw hole metal block (20) is the anti-slip metal inner wall (23) of the propane heater fixing bolt.

5. The experimental device for flying fire particle combustion under forced convection according to claim 1, characterized in that: The particle fixing nail (13) is divided into a needle-shaped particle fixing nail (24) and a straight-cylindrical particle fixing nail (25). The particle fixing bolt (14) has a particle fixing bolt anti-slip metal inner wall (27). The particle fixing bolt screw (26) is screwed into the right side of the particle fixing bolt (14). The rotating device (15) adjusts the rotation speed by rotating the frequency adjustment knob (18). The lifting platform (16) can be manually adjusted in height. The particle fixing nail (13) and the particle fixing bolt (14) are both made of metal.

6. The experimental device for flying fire particle combustion under forced convection according to claim 1, characterized in that: The damping mesh fixing bolt (7) has a main body of a damping mesh groove metal block (31), a damping mesh fixing bolt screw (29) is screwed into the left side of the damping mesh groove metal block (31), and a damping mesh fixing bolt nut (30) is screwed into the right side of the damping mesh groove metal block (31), and the damping mesh groove metal block (31) has a damping mesh groove (32) inside, and the stainless steel honeycomb rectifier plate fixing bolt (9) has a main body of a stainless steel honeycomb rectifier plate groove metal block (33), and the stainless steel honeycomb rectifier plate fixing bolt (9) has a stainless steel honeycomb rectifier plate groove (34) inside.

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