Multi-fuel suspension hot blast stove system

Abstract

The invention discloses a multi-fuel suspension hot blast stove system, and relates to the technical field of suspension hot blast stoves, the multi-fuel suspension hot blast stove system comprises a combustion furnace, a first stock bin and a second stock bin, a rice husk conveying pipeline for conveying rice husks through wind power is arranged between the second stock bin and the combustion furnace, and a feeding auger is arranged between the first stock bin and the combustion furnace; the bottom of the combustion furnace is provided with a funnel-shaped guide slope and a combustion disc with a circular concave middle portion. When rice husks are insufficient in supply, a feeding auger conveys biomass particle fuel into a combustion furnace, a tower-shaped material pile is formed in the middle of a combustion disc, an igniter ignites the material pile, a plurality of outer ring air channels convey air to supply air from multiple directions of the outer side of the material pile, combustion of the material pile is promoted, and the combustion efficiency of the material pile is improved. And the multiple outer ring air ducts are distributed in a circumferential array around the material pile combusting in the center, the airflow output direction is stable, multiple strands of airflow blow flames combusted by the material pile to generate pitaya rolls extending upwards, and the influence of the change of the height of an ignition point on heating of air in the hearth is reduced.

Description

Technical Field

[0001] This invention relates to the field of suspension hot blast stove technology, specifically a multi-fuel suspension hot blast stove system. Background Technology

[0002] As is well known, a suspended hot air furnace is a highly efficient air heating device that uses a fan to blow coal ash into the furnace, allowing the suspended coal ash to burn fully in the furnace, thereby heating the air.

[0003] For example, the invention patent with publication number CN110470054A, publication date November 19, 2019, entitled "An Energy-Saving Suspended Hot Blast Furnace," includes a combustion furnace, a heat exchanger, a cyclone dust removal system, and a horizontally arranged air duct. The air inlet of the duct is connected to an air source, and the air outlet is connected to an air inlet on the furnace body. The length direction of the duct is consistent with the tangential direction of the furnace wall at the air inlet. A feed pipe is also connected to the furnace body. By tangentially arranging the air duct to the furnace wall, the airflow entering from the duct impacts the furnace wall upon entering the furnace chamber, causing it to spiral downwards. Fuel entering from the feed pipe is suspended and falls under the action of the spiral airflow. This results in a large contact area between the fuel and the air, and a long descent time, ensuring that the fuel is fully combusted before reaching the bottom of the furnace.

[0004] The shortcomings of existing technologies are that rice husks are one of the commonly used fuels in suspended hot air furnaces and are a model of efficient utilization of biomass energy. However, rice husks have low energy density and irregular shape. The storage and dispersion of rice husks require more space, which may lead to an unstable supply of rice husks. This necessitates the use of fuels that are easier to store and have higher energy density. Biomass pellets are the most commonly used fuel. However, biomass pellets cannot be suspended and burned, resulting in an unstable heat supply. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-fuel suspension hot blast stove system to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-fuel suspension hot air furnace system, including a combustion furnace and a first silo and a second silo, wherein a rice husk conveying pipe for wind-powered conveying is provided between the second silo and the combustion furnace, a feeding auger is provided between the first silo and the combustion furnace, and a funnel-shaped guide slope and a centrally recessed combustion plate are provided at the bottom of the combustion furnace.

[0007] The guide slope is located between the combustion disc and the feeding auger, and the apex of the conical surface on which its sidewall is located is directly opposite the center of the recess in the middle of the combustion disc;

[0008] The combustion disc is provided with a central air duct located at its center and an outer ring of air ducts arranged in a circular array around the central air duct.

[0009] As a further description of the above technical solution: the combustion disc is provided with a first air inlet corresponding to the outer ring air duct, and the orientation of the first air inlet is tangent to the recessed area in the middle of the combustion disc.

[0010] As a further description of the above technical solution: the outer ring of the combustion plate is provided with a baffle that faces the first air inlet and has an arc-shaped sidewall, and the arc surface of the baffle points to the outside of the combustion plate.

[0011] As a further description of the above technical solution: the combustion plate is provided with a second air inlet adjacent to the first air inlet, the angle between the second air inlet and the first air inlet is 45°, and it faces the inside of the combustion plate.

[0012] As a further description of the above technical solution: the bran feeding pipe is provided with a plurality of feeding pipes extending to the middle of the inner side of the combustion furnace, the feeding pipes being offset relative to the center of the combustion furnace and the pipe openings being obliquely upward.

[0013] As a further description of the above technical solution: the axes of the ports of the plurality of feeding pipes intersect, and the intersection point is located on the axis of the combustion furnace.

[0014] As a further description of the above technical solution: the outer ring air duct is coiled around the top area of ​​the combustion plate and is connected to the outer ring air duct inside the combustion plate one by one.

[0015] As a further description of the above technical solution: the inner part of the outer ring duct is provided with a narrow section, the diameter of the narrow section increases towards both ends of the outer ring duct, and the narrow section is provided with a make-up air duct.

[0016] As a further description of the above technical solution: a turntable for intermittently blocking the make-up air pipe is movably installed on the central air duct.

[0017] As a further description of the above technical solution: the central air duct is provided with a petal-shaped branch pipe facing the center of the combustion plate, and the end of the branch pipe is provided with an upwardly sloping air guide plate.

[0018] In the above technical solution, the multi-fuel suspension hot air furnace system provided by the present invention has the following beneficial effects: During operation, the second blower blows air into the rice husk feeding pipe. The airflow adsorbs the rice husks in the second hopper and sends them to the middle of the combustion furnace through the rice husk feeding pipe. The igniter ignites the rice husks, which then suspend and burn inside the combustion furnace, heating the air in the furnace chamber. The heated air carries the ash from the burning rice husks upwards and enters the exhaust pipe. The auger collects the ash from the hot air and allows the clean hot air to continue moving along the exhaust pipe. The hot air contacts the heat exchanger and heats the heat medium inside the heat exchanger. When the rice husk supply is insufficient and biomass pellets are needed, the feeding auger operates and sends the biomass pellet fuel from the first hopper to the combustion furnace. The biomass pellets move downwards along the funnel-shaped guide slope and fall into the groove in the middle of the combustion pan under the action of inertia. A tower-shaped pile of materials is formed, and the igniter ignites the pile. Simultaneously, the first blower continues to operate, blowing air into the central air duct and outer ring air ducts. The central air duct blows air into the middle of the pile, keeping the central part of the tower-shaped pile loose and promoting the combustion of biomass fuel in the middle of the pile. Multiple outer ring air ducts supply air from multiple directions outside the pile, which can promote the combustion of the pile. At the same time, because the multiple outer ring air ducts are distributed in a circumferential array around the central burning pile and the output airflow direction is stable, multiple airflows blow the flames of the burning pile to generate upward-extending fire tornadoes, increasing the height of the flames. This allows the flames generated by the burning pile to evenly heat the air inside the combustion furnace, reducing the impact of changes in ignition point height on the heating of the air inside the furnace. At the same time, the flame diameter is reduced, allowing the flames to move away from the inner wall of the combustion furnace, reducing the heat exposure to the inner wall of the combustion furnace and extending the service life of the combustion furnace. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the internal structure of a combustion furnace provided in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the guiding slope provided in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the combustion disc structure provided in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the feeding tube provided in an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the first air inlet provided in an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the internal structure of the combustion disc provided in an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the outer ring duct structure provided in an embodiment of the present invention;

[0028] Figure 9 This is a schematic diagram of the structure of the branch pipe provided in an embodiment of the present invention;

[0029] Figure 10 This is a schematic diagram of the internal structure of the outer ring duct provided in an embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Combustion furnace; 11. Combustion pan; 111. Baffle; 112. Guide slope; 12. Central air duct; 121. Branch pipe; 122. Air guide plate; 123. Turntable; 124. Sealing ring; 125. Impeller; 13. Outer ring air duct; 131. First air inlet; 132. Second air inlet; 133. Outer ring air duct; 134. Narrow section; 135. Make-up air duct; 14. First fan; 15. Ash trough; 151. Ash discharge port; 2. First hopper; 21. Feeding auger; 3. Second hopper; 31. Bran feeding pipe; 32. Second fan; 33. Feeding pipe; 4. Cladding; 5. Heat exchanger. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0033] Please see Figure 1-10 The present invention provides a technical solution: a multi-fuel suspension hot air furnace system, including a combustion furnace 1, a first silo 2, and a second silo 3. A rice husk conveying pipe 31 is provided between the second silo 3 and the combustion furnace 1. A feeding auger 21 is provided between the first silo 2 and the combustion furnace 1. The bottom of the combustion furnace 1 is provided with a funnel-shaped guide slope 112 and a circular concave combustion plate 11 in the middle.

[0034] The guide slope 112 is located between the combustion disc 11 and the feeding auger 21, and the apex of the conical surface on which its side wall is located is directly opposite the center of the recess in the middle of the combustion disc 11.

[0035] The combustion plate 11 is provided with a central air duct 12 located at its center and an outer ring air duct 13 distributed in a circular array around the central air duct.

[0036] Specifically, the combustion furnace 1 is equipped with two igniters, which are located at the bottom and middle of the inner side of the combustion furnace 1, respectively. The bottom of the combustion furnace 1 is equipped with a first fan 14, which blows air into the combustion furnace 1 through the central air duct 12 and the outer ring air duct 13. It also includes an exhaust duct, a heat exchanger 5 facing the exhaust duct, and a cyclone 4 located in the exhaust duct. The end of the bran feeding duct 31 is equipped with a second fan 32.

[0037] Furthermore, during operation, the second blower 32 blows air into the rice husk feeding pipe 31. The airflow attracts the rice husks in the second hopper 3 and sends them to the middle of the combustion furnace 1 through the rice husk feeding pipe 31. The igniter ignites the rice husks, which then suspend and burn inside the combustion furnace 1, heating the air in the furnace chamber. The heated air carries the ash from the burning rice husks upwards and enters the exhaust pipe. The auger 4 collects the ash from the hot air and allows the clean hot air to continue moving along the exhaust pipe. The hot air contacts the heat exchanger 5 and heats the heat medium inside the heat exchanger 5. When the rice husk supply is insufficient and biomass pellets are needed, the feeding auger 21 operates and sends the biomass pellet fuel from the first hopper 2 to the combustion furnace 1. The biomass pellets move downwards along the funnel-shaped guide slope 112 and fall into the groove in the middle of the combustion plate 11 under inertia, forming a tower-shaped pile. The igniter then ignites the rice husks. As the pile is ignited, the first blower 14 continues to operate, blowing air into the central air duct 12 and the outer ring air duct 13. The central air duct 12 blows air into the middle of the pile, keeping the middle of the tower-shaped pile loose and promoting the combustion of biomass fuel in the middle of the pile. Multiple outer ring air ducts 13 supply air from multiple directions outside the pile, which can promote the combustion of the pile. At the same time, because the multiple outer ring air ducts 13 are distributed in a circumferential array around the central burning pile and the output airflow direction is stable, multiple airflows blow the flames of the burning pile to generate upward-extending fire tornadoes, increasing the height of the flames. This allows the flames generated by the burning pile to uniformly heat the air inside the combustion furnace 1, reducing the impact of changes in the ignition point height on the heating of the air inside the furnace. At the same time, the diameter of the flames is reduced, allowing the flames to move away from the inner wall of the combustion furnace 1, reducing the scorching of the inner wall of the combustion furnace 1 and extending the service life of the combustion furnace 1.

[0038] In another embodiment of the present invention, the combustion disc 11 is provided with a first air inlet 131 corresponding to the outer ring air duct 13, and the orientation of the first air inlet 131 is tangent to the central recessed area of ​​the combustion disc 11.

[0039] Specifically, during the continuous combustion of the tower-shaped material pile on the combustion pan 11, the outer ring air duct 13 continuously supplies airflow, and the airflow flows in a direction tangential to the recessed area under the guidance of the first air inlet 131. Moreover, the flame generated during the combustion of the material pile heats the air nearby. The hot air rises and forms a low-pressure area next to the material pile. The low-pressure area attracts the airflow input by the first air inlet 131, replenishing the material pile with fresh air. The airflow output from multiple first air inlets 131 is tangential to the tower-shaped material pile. Multiple airflows spiral upward to form a vortex, further promoting the formation of a fire tornado in the burning material pile, increasing the flame height, and reducing the impact of changes in the ignition point height on the heating of the air inside the furnace. Furthermore, when the rice husks are burning, the airflow output by the first blower 14 forms an upward vortex through the guidance of multiple first air inlets 131, which can better carry the ash generated by the burning rice husks upward and then enter the exhaust duct for separation by the saxophone 4.

[0040] In another embodiment of the present invention, the outer ring of the combustion disc 11 is provided with a baffle 111 that is directly opposite to the first air inlet 131 and has an arc-shaped sidewall. The arc surface of the baffle 111 points to the outside of the combustion disc 11.

[0041] Specifically, the bottom of the inner side of the combustion furnace 1 has an ash trough 15 surrounding the combustion plate 11, and the bottom of the combustion furnace 1 is provided with an ash discharge port 151.

[0042] Furthermore, during the combustion process of the material pile, the central air duct 12 continuously outputs upward airflow, which loosens the middle part of the material pile and promotes combustion in the middle of the material pile. The outer ring air duct 13 inputs airflow to promote combustion on the outside of the material pile. When the feeding auger 21 transports subsequent biomass pellets, the density of this part of the biomass pellets is greater than that of the pellets after combustion. Under the guidance of the guide slope 112, it continues to fall to the top of the tower-shaped material pile. Under the action of gravity, this part of the biomass pellets presses the top of the tower-shaped material pile, so that the top of the tower-shaped material pile forms a groove to accommodate this part of the biomass pellets. It also pushes the pellets on the outside of the material pile that are more fully burned to move outward. The airflow output from the first air inlet 131 that is tangential to the material pile will push this part of the pellets, causing this part of the pellets to collide with and break against the baffle 111, exposing the part that is not fully burned inside. The fully burned part is pushed by the airflow and falls along the arc surface of the baffle 111 into the ash trough 15 on the outside of the combustion plate 11, making it convenient for workers to remove the ash through the ash discharge port 151.

[0043] In another embodiment of the present invention, the combustion plate 11 is provided with a second air inlet 132 adjacent to the first air inlet 131. The angle between the second air inlet 132 and the first air inlet 131 is 45° and it faces the inside of the combustion plate 11.

[0044] Specifically, each outer ring air duct 13 corresponds to a first air inlet 131 and a second air inlet 132. The first air inlet 131 outputs airflow tangential to the material pile, promoting combustion on the periphery of the material pile. The angle between the airflow output from the second air inlet 132 and the airflow output from the first air inlet 131 is 45°. The airflow output from the second air inlet 132 directly blows the bottom of the material pile, promoting the particles that have been burned relatively fully to move to the outside of the material pile. Then, driven by the airflow output from the first air inlet 131, they collide with the baffle 111, exposing the part in the middle that has not been completely burned, helping the particles to burn fully while ensuring the stability of the flame generated by the combustion of the material pile.

[0045] In another embodiment of the present invention, the bran feeding pipe 31 is provided with a plurality of feeding pipes 33 extending to the middle of the inner side of the combustion furnace 1. The feeding pipes 33 are offset relative to the center of the combustion furnace 1 and the pipe openings are obliquely upward. The axes of the pipe openings of the plurality of feeding pipes 33 intersect, and the intersection point is located on the axis of the combustion furnace 1.

[0046] Specifically, during the continuous supply of rice husks, the first blower 14 continuously operates, supplementing fresh air into the combustion furnace 1 through the central air duct 12 and the outer ring air duct 13. The rice husks burn and heat the air inside the combustion furnace 1. The heated air flows upward and forms a low-pressure area in the middle, attracting the air below to move upward. Under the guidance of the first air inlet 131 and the second air inlet 132, and under the adsorption of the upper low-pressure area, the airflow output from the outer ring air duct 13 collides with the inner wall of the combustion furnace 1 in a direction inclined to the inner wall of the combustion furnace 1. Multiple airflows combine to form an upward vortex. The second blower 32 operates to transport... The mixture of air and rice husks moves along the feeding pipe 33 of the rice husk feeding pipe 31 and is sprayed out along the opening of the feeding pipe 33. The mixture comes into contact with the vortex, and the airflow in the mixture replenishes the vortex, so that the vortex can be maintained. The axes of the openings of multiple feeding pipes 33 intersect, and the intersection point is located on the axis of the combustion furnace 1. The rice husks of the mixture sprayed out of the opening can move towards the axis of the combustion furnace 1 while ensuring sufficient contact with air, so that the rice husks gather at a position close to the axis of the combustion furnace 1 for combustion, extending the height of the combustion flame while reducing the diameter of the flame, and reducing the scorching of the inner wall of the combustion furnace 1 by the flame.

[0047] In another embodiment of the present invention, the outer ring air duct 13 is coiled around the top area of ​​the combustion plate 11 and is connected to the outer ring air duct 133 inside the combustion plate 11 in a one-to-one correspondence.

[0048] Specifically, the bottom of the combustion plate 11 is provided with a groove, the outer ring air duct 133 is located in the groove and away from the flame on the combustion plate 11, and the first fan 14 provides fresh air to the central air duct 12 and the outer ring air duct 133.

[0049] Furthermore, during operation, the first blower 14 operates to provide fresh air to the central air duct 12 and the outer ring air duct 133. The airflow in the outer ring air duct 133 is conveyed upward into the outer ring air duct 13, which is coiled around the top area close to the combustion plate 11. During the combustion process, the heat of the material pile above the combustion plate 11 is transferred to the air in the outer ring air duct 13 through the combustion plate 11, heating the air in the outer ring air duct 13 so as to promote the combustion of the material pile.

[0050] In another embodiment of the present invention, the inner part of the outer ring duct 133 is provided with a narrow section 134, the diameter of the narrow section 134 increases towards both ends of the outer ring duct 133, the narrow section 134 is provided with a make-up air pipe 135, and a turntable 123 for intermittently blocking the make-up air pipe 135 is movably provided on the central duct 12.

[0051] Specifically, there are notches on turntables 1, 2, and 3.

[0052] Furthermore, while the first blower 14 is continuously operating, it supplies airflow to the central duct 12 and the outer duct 133. When the airflow in the outer duct 133 passes through the narrow section 134, the air is gathered by the inner wall of the outer duct 133, increasing the resistance to airflow and thus increasing the velocity and pressure of the airflow passing through the narrow section 134. The airflow from the outside, under the influence of the low-pressure region, enters the outer duct 133 through the make-up air pipe 135, increasing the airflow rate in the outer duct 133. Then, the airflow is output from the first air inlet 131 and the second air inlet 132, resulting in a stronger impact force that better promotes combustion in the material pile and the separation of more fully burned particles. During operation, the turntable 123 rotates relative to the central air duct 12, sealing off multiple make-up air ducts 135, allowing air to enter only the make-up air duct 135 directly opposite the opening. The airflow in the outer ring air ducts 133 is obstructed by the sealed make-up air ducts 135, and the airflow output by the first blower 14 is divided into the central air duct 12 and the outer ring air ducts 133 where the make-up air ducts 135 are open, so that these two air ducts can deliver more air. The rotation of the turntable 123 causes the make-up air ducts 135 on the multiple outer ring air ducts 133 to work intermittently, thereby causing the multiple outer ring air ducts 13 to intermittently deliver strong airflow, ensuring normal combustion of the material pile while avoiding interference between the airflows delivered by the multiple outer ring air ducts 13.

[0053] Furthermore, in the above embodiment, the central air duct 12 can be a two-section type with a notch in the middle. The two sections of the central air duct 12 are respectively fixedly installed on the combustion plate 11. A sealing ring 124 is rotatably installed at the notch of the central air duct 12, which seals the notch on the central air duct 12. The turntable 123 is fixedly installed on the outside of the sealing ring 124. An impeller 125 is provided on the inside of the sealing ring 124. When the airflow passes through the central air duct 12, it will drive the impeller 125 to rotate. The impeller 125 drives the sealing ring 124 and the turntable 123 to rotate, so that the multiple make-up air pipes 135 on the multiple outer ring air ducts 133 alternately face the notch on the turntable 123, and thus work alternately.

[0054] In another embodiment of the present invention, the central air duct 12 is provided with a petal-shaped branch pipe 121 facing the center of the combustion plate 11, and the end of the branch pipe 121 is provided with an upwardly inclined air guide plate 122.

[0055] Specifically, the airflow in the central duct 12 moves to the highest point and is delivered to multiple branch ducts 121. The multiple branch ducts 121 deliver airflow towards the center of the combustion pan 11 from multiple directions, preventing particles from above from falling into the branch ducts 121 and clogging them. The upward-sloping air guides 122 at the ends of the branch ducts 121 can guide the airflow upward while sealing the branch ducts 121 as much as possible and preventing them from clogging. Multiple airflows converge to form a vertically upward airflow, which replenishes air to the center of the material pile and keeps the material pile loose so that the center of the material pile can burn.

[0056] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A multi-fuel suspension hot blast stove system, characterized in that, It includes a combustion furnace (1), a first silo (2), and a second silo (3). A chaff conveying pipe (31) for conveying rice husks by wind is provided between the second silo (3) and the combustion furnace (1). A feeding auger (21) is provided between the first silo (2) and the combustion furnace (1). The bottom of the combustion furnace (1) is provided with a funnel-shaped guide slope (112) and a circular concave combustion plate (11) in the middle. The guide slope (112) is located between the combustion disc (11) and the feeding auger (21), and the vertex of the conical surface on which its sidewall is located is directly opposite the center of the recess in the middle of the combustion disc (11); The combustion plate (11) is provided with a central air duct (12) located at its center and an outer ring air duct (13) distributed in a circular array around the central air duct.

2. The multi-fuel suspension hot blast stove system according to claim 1, characterized in that, The combustion plate (11) is provided with a first air inlet (131) corresponding to the outer ring air duct (13), and the orientation of the first air inlet (131) is tangent to the central recessed area of ​​the combustion plate (11).

3. The multi-fuel suspension hot blast stove system according to claim 2, characterized in that, The outer ring of the combustion plate (11) is provided with a baffle (111) that is directly opposite to the first air inlet (131) and has an arc-shaped sidewall. The arc surface of the baffle (111) points to the outside of the combustion plate (11).

4. The multi-fuel suspension hot blast stove system according to claim 2, characterized in that, The combustion plate (11) is provided with a second air inlet (132) adjacent to the first air inlet (131). The angle between the second air inlet (132) and the first air inlet (131) is 45°, and the second air inlet (132) faces the inside of the combustion plate (11).

5. A multi-fuel suspension hot blast stove system according to claim 1, characterized in that, The rice bran feeding pipe (31) is provided with a plurality of feeding pipes (33) extending to the middle of the inner side of the combustion furnace (1). The feeding pipes (33) are offset relative to the center of the combustion furnace (1) and the pipe openings are obliquely upward.

6. A multi-fuel suspension hot blast stove system according to claim 5, characterized in that, The axes of the ports of the plurality of feed pipes (33) intersect, and the intersection point is located on the axis of the combustion furnace (1).

7. A multi-fuel suspension hot blast stove system according to claim 1, characterized in that, The outer ring air duct (13) is coiled around the top area of ​​the combustion plate (11) and is connected to the outer ring air duct (133) inside the combustion plate (11) one by one.

8. A multi-fuel suspension hot blast stove system according to claim 7, characterized in that, The outer ring duct (133) has a narrow section (134) inside, the diameter of which increases towards both ends of the outer ring duct (133), and the narrow section (134) is provided with a make-up air duct (135).

9. A multi-fuel suspension hot blast stove system according to claim 8, characterized in that, A turntable (123) for intermittently blocking the make-up air pipe (135) is movably installed on the central air duct (12).

10. A multi-fuel suspension hot blast stove system according to claim 1, characterized in that, The central air duct (12) is provided with a petal-shaped branch pipe (121) facing the center of the combustion plate (11), and the end of the branch pipe (121) is provided with an upwardly sloping air guide plate (122).

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