A suspension combustion ignition system that can be built in a laboratory

Abstract

The present invention provides a suspension combustion ignition system that can be built in a laboratory, including a box-type heating furnace. The box-type heating furnace has a combustion chamber. At the bottom of the combustion chamber, there is an ignition mechanism and a feed inlet. The feed inlet is connected to a conveying pipe. At the tail end of the conveying pipe, there is a powder discharging mechanism, and on the conveying pipe line, there is a powder feeding mechanism for supplying powder to the combustion chamber. An observation hole is also provided on the combustion chamber, and a high-speed camera is provided at the observation hole. The top of the combustion chamber is connected through a gas guide pipe to a flue gas collection and filtration mechanism. The flue gas collection and filtration mechanism includes a filtration hood. A switch door is provided on the filtration hood, and an acrylic transparent window is provided on the switch door. The operation of the present invention is simple, the experimental continuity is good, and at the same time, it is convenient to disassemble and assemble. While simulating the real combustion state, it is convenient to collect data on combustion characteristics, movement trajectories, etc., and the degree of automation is high.

Description

Technical Field

[0001] The present invention relates to the field of suspension combustion technology, and particularly to an ignition system for suspension combustion that can be built in a laboratory. Background Art

[0002] High-energy solid fuel powders such as boron and aluminum have very high mass calorific value and volume calorific value, so they have a wide range of applications. Currently, the ignition methods used to study the ignition and combustion performance of high-energy solid fuel powders mainly include box furnace ignition, laser generator ignition, etc. However, most of the above ignition methods use the method of piling up high-energy fuel powders and then igniting them, resulting in uneven mixing with air and incomplete combustion of high-energy fuel powders. At the same time, the area of the flame, the brightness of the flame, and the movement trajectory of particles cannot be observed.

[0003] Chinese Patent Application No. "CN201220110451.7" discloses a carbon powder box-type heating furnace. In order to solve the problems of the difficulty of instant combustion of existing plant carbon, a large amount of impurities generated, incomplete combustion, and insufficient calorific value, the carbon powder box-type heating furnace includes a combustion furnace. A main carbon powder bin is provided on one side of the combustion furnace, and a blowing device for blowing carbon powder into the combustion furnace through a nozzle is provided below the main carbon powder bin. An ignition device is provided on one side of the nozzle. The utility model uses instant combustion of plant carbon powder, with sufficient combustion, no pollution to the environment, clean and hygienic operation for workers, and a light and portable combustion furnace, realizing a fully automatic environmental protection combustion furnace, which can be used in heating, power generation, refrigeration, life and other aspects.

[0004] After the improvement of the carbon powder box-type heating furnace, the carbon powder combustibles can be transported through the main bin and the secondary bin. After long-term use, if the main bin and the secondary bin are damaged, they usually need to be repaired or replaced. However, when the main bin and the secondary bin are repaired or replaced, it is not easy to quickly disassemble them, making it difficult to repair or replace the main bin and the secondary bin. At the same time, the flame state, particle movement trajectory, and powder combustion performance cannot be intuitively displayed, and it is not applicable to simulate suspension combustion in a laboratory. Therefore, it is necessary to further design an ignition system for suspension combustion according to the needs of laboratory simulation. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: In order to overcome the deficiencies of the prior art, the present invention provides an ignition system for suspension combustion that can be built in a laboratory, with simple operation, good experimental continuity, convenient disassembly and assembly, while simulating the real combustion state, it is convenient to collect data on combustion characteristics, movement trajectories, etc., and has a high degree of automation.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a suspension combustion ignition system that can be built in a laboratory, including a box-type heating furnace. There is a combustion chamber inside the box-type heating furnace. An ignition mechanism and a feed port are provided at the bottom of the combustion chamber. The feed port is connected to a conveying pipe. A powder discharging mechanism is provided at the tail end of the conveying pipe, and a powder supply mechanism for supplying powder to the combustion chamber is provided on the conveying pipe; an observation hole is also provided on the combustion chamber, and a high-speed camera is provided at the observation hole; the powder discharging mechanism includes a high-pressure gas cylinder, and the tail end of the conveying pipe is connected to the air outlet end of the high-pressure gas cylinder; the powder supply mechanism includes a main material bin, a guide pipe, a secondary material bin, a first discharge pipe, a replacement mechanism, and a second discharge pipe. Fuel powder is filled in the main material bin. The guide pipe is connected between the main material bin and the secondary material bin. A suction pump is provided on the guide pipe. A feeding mechanism for conveying the fuel powder in the secondary material bin to the second discharge pipe through the first discharge pipe is provided in the secondary material bin; a flue gas collection and filtration mechanism is led out through a guide pipe at the top of the combustion chamber. The flue gas collection and filtration mechanism includes a filter cover. A switch door is provided on the filter cover, and an acrylic transparent window is provided on the switch door.

[0007] Further, the filter cover is fixed on the side wall of the box-type heating furnace through a support frame, and the filter cover is connected to the outer end of the guide pipe; a flue gas filter screen is provided at a position corresponding to the upper part of the guide pipe inside the filter cover, and a filter plate is further provided above the flue gas filter screen in the filter cover. A number of filter holes are opened on the filter plate, and activated carbon is filled in the filter holes.

[0008] Furthermore, a support convex block is fixedly connected to the inner wall of the filter hole, and one side of the support convex block is fixedly connected to the outer wall of the activated carbon.

[0009] Further, in order to facilitate real-time measurement of the temperature signal in the combustion chamber, a thermocouple is provided above the box-type heating furnace, and the measurement end of the thermocouple extends into the combustion chamber.

[0010] Further, a feed channel is opened at the top of the main material bin. A guide pipe is fixedly connected to the other side of the top of the main material bin. The bottom end of the guide pipe extends to the bottom of the inner cavity of the main material bin, and the top end of the guide pipe is fixedly connected to a suction pump. An opening is provided on one side of the secondary material bin. The feed end of the suction pump is connected to the guide pipe, and the discharge end is communicated with the opening.

[0011] Further, a rotating rod is rotatably connected to the bottom of the inner cavity of the secondary material bin. A number of wind blades are circumferentially fixed to the top of the rotating rod. The lower end of the first discharge pipe extends into the inner cavity of the secondary material bin from the top of the secondary material bin and is opposite to the rotating and conveying direction of the wind blades.

[0012] Further, the replacement mechanism includes a connector. The top of the first discharge pipe has an external thread, and the first discharge pipe is connected to the bottom of the inner cavity of the connector through the thread at the top. The bottom of the connector is fixedly connected with an upper positioning plate circumferentially. The upper positioning plate is movably sleeved on the outer wall of the first discharge pipe. The outer wall of the first discharge pipe is also fixedly provided with a lower positioning plate corresponding to the position below the upper positioning plate. The bottom of the upper positioning plate is provided with an annular groove, and an annular rubber sealing sleeve is fixedly connected to the inner cavity of the annular groove. An annular sealing gasket is movably sleeved inside the annular rubber sealing sleeve. The lower positioning plate and the upper positioning plate are sealed through the annular sealing gasket.

[0013] Furthermore, the bottom of the second discharge pipe is fixedly connected to the top of the connector. The second discharge pipe is also provided with a discharge valve. The top of the second discharge pipe is communicated with the inner cavity of the conveying pipe.

[0014] Further, a check valve is also provided above the connection position of the feed port corresponding to the conveying pipe.

[0015] Further, a flow control valve is provided on the section of the conveying pipe corresponding to the gas outlet end of the high-pressure gas cylinder and the powder supply mechanism.

[0016] The beneficial effects of the present invention are as follows. The present invention provides an ignition system for suspension combustion that can be built in a laboratory.

[0017] 1. Simple operation and good experimental continuity. Just place the weighed sample in the silo, and through the automatic sample feeding device, the suspension combustion experiment of high-energy fuel powder can be completed, and the combustion performance of the sample can be quantitatively analyzed. And it can complete the free switching between combustion experiments of different samples with different proportions without destroying the combustion atmosphere, ensuring the continuity of the experiment.

[0018] 2. Simple structure and convenient for disassembly, effectively avoiding frequent disassembly of the experimental device by scientific research personnel, saving a lot of time and reducing the safety hazards in the laboratory; through the cooperation of the upper positioning plate, annular groove, annular rubber sealing sleeve, lower positioning plate and annular sealing gasket, the tightness between the first discharge pipe and the connector is increased, preventing air leakage between the connector and the first discharge pipe, and by using a threaded connection between the connector and the first discharge pipe, it is convenient to quickly disassemble and assemble the powder supply mechanism for replacement or maintenance.

[0019] 3. The high-speed camera is fixed outside the box-type heating furnace, and it is convenient to systematically collect the combustion characteristics of high-energy solid fuel powder through the observation hole. And by shooting the movement trajectory of the high-energy fuel powder burning in the suspended state, the experimental data is enriched, the real combustion state is simulated, and the accuracy of the experimental data is ensured.

[0020] 4. High degree of automation. Through the cooperation of a filter cover, a gas guide pipe, a support frame, a filter plate, a flue gas filter screen, filter holes, activated carbon, support protrusions, a switch door, and an acrylic transparent window, the present invention can introduce the flue gas generated during the combustion of boromagnesite powder inside the combustion chamber into the interior of the filter cover, and through the cooperation of the filter plate, the flue gas filter screen, the filter holes, and the activated carbon, purify and filter the flue gas, ensuring the cleanliness of the flue gas discharged during the combustion of boromagnesite powder, and collecting the suspended burned particles in the flue gas through the filter cover for subsequent experimental analysis. This simplifies the workload of scientific researchers and effectively avoids misoperations caused by simultaneously operating multiple devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the drawings and embodiments.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 It is a cross-sectional view of the powder supply mechanism structure of the present invention.

[0024] Figure 3 It is a schematic cross-sectional view of the replacement mechanism structure of the present invention.

[0025] Figure 4 It is a schematic diagram of the upper positioning plate and the lower positioning plate structure of the present invention.

[0026] Figure 5 It is a schematic cross-sectional view of the box-type heating furnace structure of the present invention.

[0027] Figure 6 It is a schematic cross-sectional view of the filter cover structure of the present invention.

[0028] Figure 7 It is a top view schematic diagram of the filter plate structure of the present invention.

[0029] Figure 8 It is a top view schematic diagram of the filter cover structure of the present invention.

[0030] In the figure: 1. Box-type heating furnace; 2. Powder supply mechanism; 3. Powder discharging mechanism; 4. Replacement mechanism; 5. Flue gas collection and filtration mechanism; 6. Combustion chamber; 7. Ignition mechanism; 8. Thermocouple; 21. Main material bin; 22. Boron-magnesium powder; 23. Suction pump; 24. Feeding pipe; 25. Secondary material bin; 26. First discharge pipe; 27. Second discharge pipe; 28. Discharge valve; 29. Feeding channel; 251. Wind blade; 252. Rotating rod; 31. High-pressure gas cylinder; 32. Delivery pipe; 33. Flow control valve; 34. Feeding port; 35. Check valve; 41. Connector; 42. Upper positioning plate; 43. Annular groove; 44. Annular rubber sealing sleeve; 45. Lower positioning plate; 46. Annular gasket; 51. Filter cover; 52. Support frame; 53. Gas guide pipe; 54. Filter plate; 55. Flue gas filter screen; 56. Filter hole; 57. Activated carbon; 58. Support bump; 59. Switching door; 591. Acrylic transparent window. Detailed implementation mode

[0031] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner. Therefore, they only show the components related to the present invention. Directions and references (such as up, down, left, right, etc.) can only be used to assist in the description of the features in the drawings. Therefore, the following specific implementation mode is not adopted in a restrictive sense, and the scope of the claimed subject matter is only defined by the appended claims and their equivalent forms. Embodiment

[0032] As Figure 1 、 Figure 2 And Figure 5 shown, a suspension combustion ignition system that can be built in a laboratory is Embodiment 1 of the present invention.

[0033] As Figure 1 shown, the ignition system includes a box-type heating furnace 1. A flue gas collection and filtration mechanism 5 is provided at the top of one side of the box-type heating furnace 1. A powder discharging mechanism 3 is provided at one side below the box-type heating furnace 1. The powder discharging mechanism 3 includes a high-pressure gas cylinder 31. A delivery pipe 32 is fixedly connected to the top of one side of the high-pressure gas cylinder 31. A flow control valve 33 is provided on the delivery pipe 32. A feeding port 34 is provided at one side of the bottom of the box-type heating furnace 1. One end of the delivery pipe 32 is fixedly connected to the bottom of the feeding port 34. A powder supply mechanism 2 is provided below the delivery pipe 32.

[0034] As Figure 2 shown, the powder supply mechanism 2 includes a main material bin 21. A feeding channel 29 is provided at the top of the main material bin 21 for filling the inner cavity of the main material bin 21 with high-energy fuel powder. In this embodiment, the high-energy fuel powder is preferably boron-magnesium powder 22.

[0035] A secondary material bin 25 is fixedly connected to the top of the main material bin 21. A first discharge pipe 26 is fixedly sleeved at the top of the inner cavity of the secondary material bin 25. A feed channel 29 is provided at the top of one side of the main material bin 21. A guide pipe 24 is fixedly connected to one side of the top of the main material bin 21. The bottom end of the guide pipe 24 extends to the bottom of the inner cavity of the main material bin 21. The top end of the guide pipe 24 is fixedly connected to a suction pump 23. One end of the suction pump 23 is fixedly connected to one side of the secondary material bin 25. An opening is provided on one side of the secondary material bin 25. The discharge end of the suction pump 23 is located on one side of the opening, and is used to suck and convey the boromagnesite powder 22 from the bottom of the main material bin 21 to the secondary material bin 25.

[0036] A rotating rod 252 is rotatably connected to the bottom of the inner cavity of the secondary material bin 25. A wind blade 251 is fixedly connected to the top of the side surface of the rotating rod 252. The number of the wind blades 251 is multiple. A second discharge pipe 27 is fixedly connected to the top of the connecting head 41. A discharge valve 28 is provided on the second discharge pipe 27. The top of the second discharge pipe 27 is fixedly connected to the bottom of the conveying pipe 32. The top of the second discharge pipe 27 communicates with the inner cavity of the conveying pipe 32.

[0037] The boromagnesite powder 22 is sucked from the bottom of the main material bin 22 by the suction pump 23 through the guide pipe 24 and then enters the secondary material bin 25. Inside the secondary material bin 25, by rotating the rotating rod 252 to drive the wind blade 251 to rotate, the boromagnesite powder 22 enters the first discharge pipe 26 from the secondary material bin 25, enters the conveying pipe 32 through the second discharge pipe 27, and is conveyed to the combustion chamber 6 from the feed port 34 under the action of the powder discharging mechanism 3.

[0038] A combustion chamber 6 is provided on the inner wall of the box-type heating furnace 1. An ignition mechanism 7 is installed below the combustion chamber 6. One side of the feed port 34 communicates with the inner cavity of the combustion chamber 6. A check valve 35 is installed in the inner cavity of the feed port 34.

[0039] A thermocouple 8 is provided above the box-type heating furnace 1. The measuring end of the thermocouple 8 extends to one side of the inner cavity of the combustion chamber 6 and is used to measure the temperature inside the combustion chamber 6. An observation hole is also provided on the combustion chamber. A high-speed camera is provided at the observation hole. Through the observation hole, it is convenient to systematically collect the combustion characteristics of the high-energy solid high-energy fuel powder. And by shooting the movement trajectory of the high-energy high-energy fuel powder burning in a suspended state with the high-speed camera, the experimental data can be enriched, the real combustion state can be simulated, and the accuracy of the experimental data can be guaranteed.

[0040] In this embodiment, it is convenient to add the boromagnesite powder 22 to the inner cavity of the main material bin 21 through the feed channel 29 for subsequent combustion use by the box-type heating furnace 1. In the main material bin 21, the feeding position and the feed channel 29 are located above, and the discharging position is located below. During continuous combustion, feeding from above and discharging from below can effectively realize the continuity of feeding and ensure the continuity of combustion.

[0041] During feeding, through the cooperation of the material guiding pipe 24 of the material suction pump 23, the boron-magnesium powder 22 inside the main material bin 21 is sucked into the inner cavity of the material bin 25. At the same time, when the material suction pump 23 discharges materials, it will also generate a certain amount of wind force, which drives the wind blades 251 and the rotating rod 252 to rotate, causing the boron-magnesium powder 22 to float in the inner cavity of the material bin 25. At the same time, the flow control valve 33 is opened, and the air in the inner cavity of the high-pressure gas cylinder 31 is discharged into the combustion chamber 6 through the delivery pipe 32 and the feed inlet 34, providing air for the combustion chamber 6 in the box-type heating furnace 1, and preventing gas backflow through the check valve 35. While the air flows at a high speed in the delivery pipe 32, the air pressure nearby decreases. At this time, the discharge valve 28 is opened, so that the boron-magnesium powder 22 inside the material bin 25 is sucked into the delivery pipe 32 through one end of the first discharge pipe 26, the connector 41 and the second discharge pipe 27, and is sprayed into the combustion chamber 6 along with the air, which facilitates quickly providing the boron-magnesium powder 22 for the box-type heating furnace 1 and improves the convenience of feeding the box-type heating furnace 1. Example

[0042] As Figure 1 , Figure 2 , Figure 3 and Figure 4 shown, a suspension combustion ignition system that can be built in a laboratory is the second embodiment of the present invention. On the basis of the first embodiment, a replacement mechanism 4 is provided at the top of the first discharge pipe 26.

[0043] Specifically, the replacement mechanism 4 includes a connector 41. The top of the first discharge pipe 26 is threadedly connected to the bottom of the inner cavity of the connector 41. The bottom of the connector 41 is fixedly connected with an upper positioning plate 42, and the upper positioning plate 42 is movably sleeved on the outer wall of the first discharge pipe 26. At the same time, a lower positioning plate 45 is also fixedly arranged on the outer wall of the first discharge pipe 26. The lower positioning plate 45 is correspondingly arranged below the upper positioning plate 42. An annular groove 43 is opened at the bottom of the upper positioning plate 42. An annular rubber sealing sleeve 44 is fixedly connected to the inner cavity of the annular groove 43. An annular gasket 46 is movably sleeved inside the annular rubber sealing sleeve 44. The bottom of the upper positioning plate 42 abuts against the lower positioning plate 45. The lower positioning plate 45 is fixedly sleeved on the outer wall of the first discharge pipe 26. The bottom of the annular gasket 46 is fixedly connected to the top of the lower positioning plate 45. Through the annular gasket 46, the upper positioning plate 42 and the lower positioning plate 45 can be sealed.

[0044] In this embodiment, through the cooperation of the upper positioning plate 42, the annular groove 43, the annular rubber sealing sleeve 44, the lower positioning plate 45 and the annular gasket 46, the annular gasket 46 is sleeved inside the annular rubber sealing sleeve 44 to increase the sealing performance between the first discharge pipe 26 and the connector 41, prevent air leakage between the connector 41 and the first discharge pipe 26, and by using a threaded connection between the connector 41 and the first discharge pipe 26, by rotating the first discharge pipe 26, the first discharge pipe 26 and the connector 41 can be separated, and the powder supply mechanism 2 can be quickly disassembled for easy replacement or maintenance. Embodiment

[0045] Such as Figure 1 , Figure 6 and Figure 7 shown, a suspension combustion ignition system that can be built in a laboratory is Embodiment Three of the present invention. On the basis of Embodiment One, a flue gas collection and filtration mechanism 5 is provided on the box-type heating furnace 1.

[0046] Specifically, the flue gas collection and filtration mechanism 5 includes a filter hood 51. A filter plate 54 is fixedly connected to the inner cavity of the filter hood 51. Filter holes 56 are formed in the filter plate 54. The number of the filter holes 56 is multiple. Activated carbon 57 is provided in the inner cavities of the multiple filter holes 56. A flue gas filter net 55 is fixedly connected to the bottom of the filter plate 54. A switch door 59 is installed on the front of the filter hood 51. An acrylic transparent window 591 is provided on the front of the switch door 59.

[0047] A gas guide pipe 53 is fixedly connected to the top of one side of the box-type heating furnace 1. One end of the gas guide pipe 53 extends to the top of one side of the inner cavity of the combustion chamber 6. The other end of the gas guide pipe 53 extends into the inner cavity of the filter hood 51. The other end of the gas guide pipe 53 is located below the filter plate 54. A support frame 52 is fixedly connected to one side of the filter hood 51. One end of the support frame 52 is fixedly connected to the top of one side of the box-type heating furnace 1. Support bumps 58 are fixedly connected to the inner walls of the multiple filter holes 56. One side of the support bumps 58 is fixedly connected to the outer wall of the activated carbon 57.

[0048] In this embodiment, the filter hood 51 is supported by the support frame 52 to keep the filter hood 51 firmly fixed to the top of one side of the box-type heating furnace 1. When the boromagnesite powder 22 burns in the inner cavity of the combustion chamber 6, the generated flue gas is discharged into the filter hood 51 through the gas guide pipe 53, and the flue gas is filtered by the flue gas filter net 55 to block the particulate matter suspended in the flue gas, and the particulate matter is collected in the filter hood 51 for subsequent experimental analysis. The flue gas then rises into the filter holes 56 on the filter plate 54, and at the same time, the activated carbon 57 in the filter holes 56 is used to purify the flue gas to ensure the cleanliness of the discharged flue gas of the boromagnesite powder 22 combustion.

[0049] In summary, when the ignition system is in use, the magnesium borate powder 22 inside the main material bin 21 is sucked into the inner cavity of the material supply bin 25 through the material suction pump 23 and the material guide pipe 24. At the same time, the flow control valve 33 is opened, and the air inside the high-pressure gas cylinder 31 passes through the delivery pipe 32 and the feed inlet 34 and is discharged into the combustion chamber 6 to supply air to the combustion chamber 6 in the box-type heating furnace 1. While the air is flowing at a high speed in the delivery pipe 32, the air pressure nearby decreases. At this time, the discharge valve 28 is opened, so that the magnesium borate powder 22 inside the material supply bin 25 is sucked into the delivery pipe 32 through one end of the first discharge pipe 26, the connector 41, and the second discharge pipe 27, and is sprayed into the combustion chamber 6 along with the air, causing the magnesium borate powder 22 to be suspended in the combustion chamber 6. Then, the ignition mechanism 7 is started to ignite and burn the magnesium borate powder 22 inside the combustion chamber 6. The flue gas during combustion is discharged into the filter hood 51 through the gas guide pipe 53, and the suspended particulate matter after combustion in the flue gas is filtered and blocked by the flue gas filter screen 55. Then, the flue gas is purified by the activated carbon 57 inside the filter holes 56, and then the flue gas is discharged. When it is necessary to replace or repair the powder supply mechanism 2, by rotating the first discharge pipe 26, the separation between the first discharge pipe 26 and the connector 41 can be achieved, and the powder supply mechanism 2 can be quickly disassembled.

[0050] Enlightened by the above ideal embodiments of the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An ignition system for suspended combustion that can be set up in a laboratory, characterized in that: It includes a box-type heating furnace (1). There is a combustion chamber (6) inside the box-type heating furnace (1). At the bottom of the combustion chamber (6), there is an ignition mechanism (7) and a feed inlet (34). The feed inlet (34) is connected to a conveying pipe (32). At the tail end of the conveying pipe (32), there is a powder discharging mechanism (3), and on the pipeline of the conveying pipe (32), there is a powder feeding mechanism (2) for feeding powder to the combustion chamber (6); there is also an observation hole on the combustion chamber (6), and a high-speed camera is provided at the observation hole. The powder discharging mechanism (3) includes a high-pressure gas cylinder (31). The tail end of the conveying pipe (32) is connected to the air outlet end of the high-pressure gas cylinder (31). The powder feeding mechanism (2) includes a main material bin (21), a guide pipe (24), a secondary material bin (25), a first discharge pipe (26), a replacement mechanism (4), and a second discharge pipe (27). The main material bin (21) is filled with fuel powder. The guide pipe (24) is connected between the main material bin (21) and the secondary material bin (25). A suction pump (23) is provided on the guide pipe (24). Inside the secondary material bin (25), there is a feeding mechanism for conveying the fuel powder in the secondary material bin (25) to the second discharge pipe (27) through the first discharge pipe (26). At the top of the combustion chamber (6), a flue gas collection and filtration mechanism (5) is led out through a gas guide pipe (53). The flue gas collection and filtration mechanism (5) includes a filter hood (51). A switch door (59) is provided on the filter hood (51). An acrylic transparent window (591) is provided on the switch door (59). At the top of the main material bin (21), a feeding channel (29) is opened. On the other side at the top of the main material bin (21), a guide pipe (24) is fixedly connected. The bottom end of the guide pipe (24) extends to the bottom of the inner cavity of the main material bin (21). The top end of the guide pipe (24) is fixedly connected with a suction pump (23). An opening is provided on one side of the secondary material bin (25). The feeding end of the suction pump (23) is connected to the guide pipe (24), and the discharging end is communicated with the opening. The replacement mechanism (4) includes a connecting head (41). The top of the first discharge pipe (26) has an external thread. The first discharge pipe (26) is connected to the bottom of the inner cavity of the connecting head (41) through the thread at the top. The bottom circumference of the connecting head (41) is fixedly connected with an upper positioning plate (42). The upper positioning plate (42) is movably sleeved on the outer wall of the first discharge pipe (26). A lower positioning plate (45) is also fixedly provided on the outer wall of the first discharge pipe (26) corresponding to the lower part of the upper positioning plate (42). An annular groove (43) is opened at the bottom of the upper positioning plate (42). An annular rubber sealing sleeve (44) is fixedly connected to the inner cavity of the annular groove (43). An annular sealing gasket (46) is movably sleeved inside the annular rubber sealing sleeve (44). The lower positioning plate (45) and the upper positioning plate (42) are sealed through the annular sealing gasket (46).

2. The ignition system for suspended combustion that can be built in a laboratory according to claim 1, characterized in that: The described filter cover (51) is fixed to the side wall of the box-type heating furnace (1) through a support frame (52), and the filter cover (51) is connected to the outer end of the air duct (53); a flue gas filter screen (55) is provided at a position corresponding to the upper part of the air duct (53) inside the filter cover (51), and a filter plate (54) is further provided above the flue gas filter screen (55) in the filter cover (51). A number of filter holes (56) are formed in the filter plate (54), and activated carbon (57) is filled in the filter holes (56).

3. A suspension combustion ignition system that can be built in a laboratory according to claim 2, characterized in that: Support bumps (58) are fixedly connected to the inner wall of the filter holes (56), and one side of the support bumps (58) is fixedly connected to the outer wall of the activated carbon (57).

4. A floating combustion ignition system that can be built in a laboratory as claimed in claim 1, characterized in that: A thermocouple (8) is provided above the box-type heating furnace (1), and the measuring end of the thermocouple (8) extends into the combustion chamber (6).

5. A suspension combustion ignition system that can be built in a laboratory, characterized in that: A rotating rod (252) is rotatably connected to the bottom of the inner cavity of the material bin (25). A number of wind blades (251) are circumferentially fixed to the top of the rotating rod (252). The lower end of the first discharge pipe (26) extends into the inner cavity of the material bin (25) from the top of the material bin (25) and is opposite to the rotating conveying direction of the wind blades (251).

6. The ignition system for suspension combustion that can be built in a laboratory as claimed in claim 1, wherein: The bottom of the second discharge pipe (27) is fixedly connected to the top of the connector (41). A discharge valve (28) is further provided on the second discharge pipe (27). The top of the second discharge pipe (27) is communicated with the inner cavity of the conveying pipe (32).

7. A floating combustion ignition system that can be built in a laboratory according to claim 1, characterized in that: A check valve (35) is further provided above the connection position of the feed inlet (34) corresponding to the conveying pipe (32).

8. A suspension combustion ignition system that can be built in a laboratory as described in claim 1, characterized in that: A flow control valve (33) is provided on the pipeline of the conveying pipe (32) corresponding to the air outlet end of the high-pressure gas cylinder (31) and between the powder supply mechanism (2).

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