Combustion furnace with high combustion rate and low coking

Abstract

The present invention discloses a combustion furnace with a high combustion rate and low coking, belonging to the technical field of energy conversion equipment. The present invention includes a combustion mechanism, a flue and a heat exchange mechanism. A grate is provided in the middle of the combustion mechanism, and ventilation holes are evenly distributed on the grate. The grate divides the combustion mechanism into upper and lower chambers. The upper part of the grate is the combustion chamber, and the lower part of the grate is the air inlet chamber. An anti-coking system is provided in the combustion chamber. An automatic feeding port is provided on the side wall of the combustion chamber. The anti-coking system includes a pushing mechanism and a driving mechanism. The pushing mechanism is located above the grate. The pushing mechanism is located below the automatic feeding port. The driving mechanism drives the bottom end of the pushing mechanism to reciprocate along the grate. It can increase the temperature in the combustion chamber, so as to meet the temperature for sufficient combustion of the fuel, improve the utilization rate of biomass fuel and reduce pollution. The combustion mechanism and the heat exchange mechanism are relatively separated in a closed system, ensuring the full release of fuel heat energy and the efficient replacement of heat energy by the medium.

Description

Technical Field

[0001] The invention relates to the technical field of energy conversion equipment, in particular to a combustion furnace with high combustion rate and low coking. Background Art

[0002] As we all know, most traditional small combustion furnaces adopt open combustion, with an air inlet at the bottom of the furnace, a chimney connected to the top side wall of the furnace, and air sucked by the chimney. There is a feeding port on the top and covered with a cover plate, and the heat exchange pipe exchanges heat in the highest temperature area of ​​the furnace. A large amount of coal tar is produced during the combustion process. Coal tar is formed between 260℃-540℃ and requires more than 800℃ to burn. Since the heat exchange pipe of the traditional combustion furnace is in the highest temperature area of ​​the furnace, the furnace temperature is further reduced, so that almost all coal tar gases are discharged, resulting in blockage of the flue, and also resulting in extremely low fuel thermal energy utilization of the traditional combustion furnace. The grate cannot automatically discharge slag, which makes it inconvenient to use. A large amount of ash and some incompletely burned coal balls block the air inlet channel, which is more likely to cause more combustible and harmful gases to leak out due to oxygen-deficient combustion.

[0003] During use, fuel needs to be added from the feeding port in batches, and the fuel is easy to accumulate. After each fuel is added, the temperature of the furnace and chimney will drop, and the suction of the chimney will decrease as the temperature drops, resulting in severe oxygen deficiency in the furnace, resulting in combustion without ignition, and producing a large amount of combustible gas and toxic pollutants (such as carbon monoxide). Especially when the fire is sealed at night, a large amount of toxic gas will leak out, causing gas poisoning, excessive emissions and a large amount of combustible waste; in the middle stage of combustion, the fire is strong and the temperature of the emitted flue gas is too high, which increases the suction of the chimney, and the large amount of high-temperature gas discharged also causes extreme waste of energy; especially in order to reduce the compaction degree of volatile matter of shaped coal (the national standard volatile matter is not more than 12%), in the exhaust period, the center part of the coal ball is wrapped by the outer layer and is difficult to burn, resulting in very weak firepower, and at this time a new round of coal adding starts, and such a cycle causes energy waste and environmental pollution.

[0004] At present, with the vigorous promotion of biomass fuel, there is an urgent need for a combustion furnace that can match biomass fuel. Biomass pellets are mainly extruded from biomass such as straw and wood, which contain more alkali metal elements such as potassium and sodium. The salt formed by them melts during the combustion of biomass pellets due to its low melting point. After melting, it becomes fluid and combines with the unmelted ash. After cooling, it hardens and forms a block of coke, which hinders combustion and needs to be stopped for physical removal. In addition, biomass fuel will produce a large amount of volatiles during the combustion process. The combustion of volatiles requires high temperature, and ordinary coal-fired furnaces cannot meet the temperature requirements for biomass combustion.

[0005] In summary, developing suitable stoves to adapt to the combustion of clean coal and biomass has become a difficult problem that needs to be solved and overcome in the promotion of clean coal and biomass. Summary of the invention

[0006] The present invention provides a combustion furnace with a high combustion rate and low coking, which can improve the utilization rate of fuel, achieve automatic slag discharge, be safe and convenient to use, and save energy.

[0007] A combustion furnace with a high combustion rate and low coking includes a combustion mechanism, a flue, and a heat exchange mechanism. A partition is horizontally arranged in the middle of the combustion mechanism. A fuel bin is arranged in the middle of the partition. The top of the fuel bin is open. A grate is arranged at the bottom of the fuel bin. Ventilation holes are evenly distributed on the grate. The partition divides the combustion mechanism into upper and lower chambers. The upper part of the partition is the combustion chamber, and the lower part of the partition is the air inlet chamber. An anti-coking system is arranged in the combustion chamber. An automatic feeding port is arranged on the side wall of the combustion chamber. The anti-coking system includes a pushing mechanism and a driving mechanism. The pushing mechanism is located above the grate and below the automatic feeding port. The driving mechanism drives the bottom end of the pushing mechanism to reciprocate along the grate. The combustion chamber, the flue, and the heat exchange mechanism are connected in sequence.

[0008] For the above-mentioned combustion furnace with a high combustion rate and low coking, the pushing mechanism is located on the left side of the automatic feeding port. The pushing mechanism includes two push plates arranged in a V shape, a sleeve, and a connecting rod. The connecting rod is horizontally arranged in the combustion chamber. The tops of the push plates are connected to the sleeve. The sleeve is sleeved on the connecting rod. The bottom ends of the push plates are close to the upper surface of the grate. The driving mechanism is located between the two push plates. The driving mechanism drives the push plates to swing left and right. An ash discharge port is arranged at the right end of the grate.

[0009] For the above-mentioned combustion furnace with a high combustion rate and low coking, the driving mechanism includes a motor and a cam. The outer edge of the cam contacts the push plate. A rotating shaft is arranged in the middle of the cam. The driving end of the rotating shaft passes through the side wall of the combustion chamber and is connected to the driving shaft of the motor. The motor drives the cam to rotate.

[0010] For the above-mentioned combustion furnace with a high combustion rate and low coking, a cylindrical gas combustion chamber is arranged at the top of the combustion chamber. A plurality of layers of heat storage plates are arranged in the gas combustion chamber. One side of the heat storage plate is fixedly connected to the side wall of the gas combustion chamber. The heat storage plates are mutually staggered to form a serpentine channel in the gas combustion chamber. The flue gas inlet of the gas combustion chamber is located at the left end of the bottom of the gas combustion chamber. The flue gas outlet of the gas combustion chamber is located at the top of the gas combustion chamber and is connected to the flue. A dust falling area is arranged between the gas combustion chamber and the side wall of the combustion chamber. Ash falling ports are arranged around the partition. The ash falling ports are located below the dust falling area.

[0011] For the above combustion furnace with high combustion rate and low coking, a coke removal mechanism is further provided above the grate. The coke removal mechanism is located above the right side of the grate. The coke removal mechanism includes a roller shaft and a plurality of crushing knives. The crushing knives are evenly distributed on the outer side wall of the roller shaft, and the outer edge of the crushing knife is close to the right edge of the grate. Both ends of the roller shaft are respectively connected to the front side wall and the rear side wall of the combustion chamber, and the rear end of the roller shaft passes through the rear side wall of the combustion chamber and is connected to a motor.

[0012] For the above combustion furnace with high combustion rate and low coking, the crushing knives are strip-shaped and distributed along the axial direction of the roller shaft. The longitudinal section of the crushing knife is triangular. One side of the crushing knife is connected to the roller shaft, and a cutting edge is provided on the other side of the crushing knife; the cutting edge of the crushing knife is curved, and the bending direction of the cutting edge is the same as the rotation direction of the roller shaft.

[0013] For the above combustion furnace with high combustion rate and low coking, a re-air distribution mechanism is further provided. The re-air distribution mechanism includes a wind guiding plate and a longitudinal partition plate. The wind guiding plate is horizontally arranged above the ash discharge port, and the top end and the bottom end of the longitudinal partition plate are respectively connected to the wind guiding plate and the partition plate.

[0014] For the above combustion furnace with high combustion rate and low coking, combustion holes are provided on the heat storage plate, and the included angle between the wind guiding plate and the horizontal plane is 25 - 45 °

[0015] For the above combustion furnace with high combustion rate and low coking, a second air distribution port is provided at the left end of the grate, and the second air distribution port is to the left of the push plate.

[0016] For the above combustion furnace with high combustion rate and low coking, the side walls of the combustion chamber and the flue are both in a sealed state, and an induced draft fan is provided at the flue gas output end of the flue.

[0017] Compared with the prior art, the present invention separates the combustion chamber and the heat exchange mechanism, and there is no heat exchange outside the solid combustion chamber. The heat generated by combustion is all retained in the solid combustion chamber and the gas combustion chamber, forming a high-temperature and stable environment in the solid combustion chamber and the gas combustion chamber, which is conducive to the combustion of volatile components in biomass. In this way, the combustion speed and thermal efficiency can be improved, the combustion rate of tar can also be increased, and the blockage of the flue by tar can be reduced.

[0018] During the combustion process, the infrared rays generated by the heat storage plate can increase the temperature of the combustion chamber. When the biomass volatile components pass through the high-temperature heat storage plate, the combustion speed of the volatile components can be increased. The serpentine channel can increase the contact area between the volatile components and the high-temperature heat storage plate. At the same time, it extends the path of the volatile components in the gas combustion chamber and prolongs the residence time of the volatile components in the combustion chamber, enabling various volatile components to burn fully and as completely as possible. It can block the ash generated during the combustion process of biomass, and most of the ash enters the ash falling area and drops, reducing the ash entering the flue, thereby reducing the blockage of the flue and improving the heat exchange efficiency.

[0019] The present invention adopts a closed combustion chamber and flue, which can ensure the sealing performance and reduce the leakage of volatile components. The anti-coking mechanism can avoid coking formed by the piled combustion of biomass particles or clean-type coal. The small amount of coking formed in the solid combustion chamber falls into the lower air inlet chamber after being sheared by the coke removal mechanism, realizing automatic slag discharge. The influence of coking of biomass or clean-type coal on combustion is effectively reduced. The gas combustion chamber is provided with a regenerative infrared serpentine channel and secondary air distribution is set for it, which can cause turbulence to make the combustion more complete. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 2 is a schematic structural diagram of the combustion mechanism of the present invention;

[0022] Figure 3 is a schematic structural diagram of the anti-coking system of the present invention;

[0023] The reference signs in the drawings denote: 1. Combustion mechanism, 2. Flue, 3. Heat exchange mechanism, 4. Partition board, 5. Fuel bin, 6. Grate, 7. Vent hole, 8. Combustion chamber, 9. Air inlet chamber, 10. Automatic feeding port, 13. Pusher plate, 14. Sleeve, 15. Connecting rod, 17. Cam, 18. Rotating shaft, 19. Gas combustion cavity, 20. Regenerative plate, 21 Ash falling area, 22. Ash falling port, 23. Roller shaft, 24. Crushing knife, 25. Ash discharge port, 26. Air guiding plate, 27. Longitudinal partition board, 29. Combustion hole, 30. Second air distribution port. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will further describe in detail the specific embodiments of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention.

[0025] As shown in the attached Figure 1 to the attached Figure 2As shown in the figure, the present invention includes a combustion mechanism 1, a flue 2 and a heat exchange mechanism 3. A partition plate 4 is horizontally arranged in the middle of the combustion mechanism 1. A fuel bin 5 is arranged in the middle of the partition plate 4. The top of the fuel bin 5 is open. A grate 6 is arranged at the bottom of the fuel bin 5. Vent holes 7 are evenly distributed on the grate 6. The partition plate 4 divides the combustion mechanism 1 into upper and lower chambers. The upper part of the partition plate 4 is a combustion chamber 8, and the lower part of the partition plate 4 is an air inlet chamber 9. An anti-coking system is arranged in the combustion chamber 8. An automatic feeding port 10 is arranged on the side wall of the combustion chamber 8. The anti-coking system includes a pushing mechanism and a driving mechanism. The driving mechanism drives the bottom end of the pushing mechanism to reciprocate along the grate 6. The pushing mechanism is located on the left side of the automatic feeding port 10. The pushing mechanism includes two push plates 13 arranged in a V shape, a sleeve 14 and a connecting rod 15. The connecting rod 15 is horizontally arranged in the combustion chamber 8. The tops of the push plates 13 are both connected to the sleeve 14. The sleeve 14 is sleeved on the connecting rod 15. The bottom ends of the push plates 13 are close to the upper surface of the grate 6. An ash discharge port 25 is arranged at the right end of the grate 6. The driving mechanism is located between the two push plates 13. The driving mechanism includes a motor and a cam 17. The outer edge of the cam 17 contacts the push plate 13. A rotating shaft 18 is arranged in the middle of the cam 17. The driving end of the rotating shaft 18 penetrates through the side wall of the combustion chamber 8 and is connected to the driving shaft of the motor. The motor drives the cam 17 to rotate. The cam 17 pushes the push plate 13 to swing left and right. Through the above settings, when burning, the cam 17 rotates to push the right push plate 13 to move to the right. The push plates are arranged in a V shape. The two push plates and the sleeve together form a stable triangular structure. After the push plate is pushed by the cam, the two push plates swing to the left together under the action of gravity, and finally the right push plate returns to its original position. The V-shaped push plate and the cam cooperate to enable the right push plate to complete a reciprocating motion. The swing amplitude of each push plate 13 is 20-30 millimeters. After each reciprocating motion, a space is formed on the right side of the push plate 13. The fuel particles from the automatic feeding port fill this space and burn and gasify in this space, and then the cam rotates to drive the push plate for the next push. The push plate can push the fuel to the right, so as to realize the rightward movement of the fuel on the grate 6. According to the different volatile components of different fuels, the rotation speed of the cam 17 is adjusted. The higher the volatile component of the fuel, the faster the combustion speed, and the rotation speed of the cam 17 needs to be adjusted faster, and vice versa.

[0026] The side walls of the combustion chamber 8 and the flue 2 are both in a sealed state. An induced draft fan is arranged at the flue gas output end of the flue 2. Such a setting can keep the combustion mechanism 1 in a negative pressure state all the time.

[0027] To meet the conditions for the full combustion of volatile matter, a cylindrical gas combustion chamber 19 is provided at the top of the combustion chamber 8. A number of heat storage plates 20 are arranged in the gas combustion chamber 19. The heat storage plates 20 are preferably made of ferritic chromium-aluminum plates, and through holes are provided on the heat storage plates 20. One side of the heat storage plate 20 is fixedly connected to the side wall of the gas combustion chamber 19. The heat storage plates 20 are mutually offset to form a serpentine channel in the gas combustion chamber 19. The flue gas inlet of the gas combustion chamber 19 is located at the left end of the bottom of the gas combustion chamber 19. The flue gas outlet of the gas combustion chamber 19 is located at the top of the gas combustion chamber 19 and is communicated with the flue 2. A dust falling area 21 is formed between the gas combustion chamber 19 and the side wall of the combustion chamber 8. Ash discharge openings 22 are provided around the partition plate 4, and the ash discharge openings 22 are located below the dust falling area 21. Through the above settings, the heat storage plates 20 are made of ferritic chromium-aluminum plates, and combustion holes 29 with a diameter of 6 mm are drilled on them. During the combustion process, the specific heat capacity of the ferritic chromium-aluminum alloy plate is relatively high, and it absorbs heat quickly. After absorbing heat, it emits infrared rays to increase the temperature and form a high-temperature area. The serpentine channel can extend the contact area between the flue gas and the heat storage plate 20. When the gasified volatile matter passes through the serpentine channel, the contact area with the high-temperature ferritic chromium-aluminum alloy plate also increases, which is conducive to full combustion. When the gasified volatile matter passes through the serpentine channel of the gas combustion chamber 19, the gas also rises through the combustion holes 29 on the heat storage plate 20 to form a vertical air flow. The vertical air flow and the horizontal air flow are mixed to form a turbulent flow, making the gas mixture more uniform and the combustion more complete. During the combustion process, the ashes in the high-temperature flue gas form a layer-by-layer barrier and fall here, so that the ashes do not enter the flue 2. At the same time, these heat storage plates 20 can be set to be detachably connected to the side wall of the gas combustion chamber 19. After the ashes accumulate on the heat storage plates 20, they can be cleaned regularly to avoid the ashes entering the heat exchange mechanism 3 and the flue 2 to the greatest extent and improve the heat exchange efficiency.

[0028] Some of the ashes generated by the combustion of the fuel on the grate 6 will rise with the flue gas. These ashes are blocked by the lowermost heat storage plate 20 and spread to both sides. The ashes will enter the dust falling area 21 between the gas combustion chamber 19 and the inner wall of the combustion chamber 8. Then, the ashes in the dust falling area 21 accumulate and fall to the ash discharge opening 22, and finally fall into the air inlet chamber 9 for removal together. The side wall of the air inlet chamber 9 is provided with an air inlet, and the ashes in the air inlet chamber can also be removed through the air inlet.

[0029] See appendix Figure 2 and appendix Figure 3, the descaling mechanism is located above the right side of the grate 6. The descaling mechanism includes a roller shaft 23 and a plurality of crushing knives 24. The crushing knives 24 are evenly distributed on the outer side wall of the roller shaft 23, and the outer edge of the crushing knife 24 is close to the right edge of the grate 6. The two ends of the roller shaft 23 are respectively connected to the front side wall and the rear side wall of the combustion chamber 8. The rear end of the roller shaft 23 passes through the rear side wall of the combustion chamber 8 and is connected to the motor. The crushing knife 24 is strip-shaped and distributed along the axial direction of the roller shaft 23. The longitudinal section of the crushing knife 24 is triangular. One side of the crushing knife 24 is connected to the roller shaft 23, and the other side of the crushing knife 24 is provided with a blade; the blade of the crushing knife 24 is curved, and the bending direction of the blade is the same as the rotation direction of the roller shaft 23. Through the above settings, the crushing knife 24 shears the coking substances and ashes on the right side of the grate 6, and then twists and drops the sheared coking substances and ashes into the air inlet chamber 9.

[0030] In order to prevent the coking substances from blocking the ventilation holes 7 on the grate 6 and causing insufficient air supply and air distribution for the fuel on the grate 6, a re-air distribution mechanism is also provided. The re-air distribution mechanism includes a wind guiding plate 26 and a longitudinal partition plate 27. The wind guiding plate 26 is horizontally arranged above the ash outlet. The included angle between the wind guiding plate 26 and the horizontal plane is 25-45 °. The top end and the bottom end of the longitudinal partition plate 27 are respectively connected to the wind guiding plate 26 and the partition plate 4. A through hole is provided in the middle of the partition plate 4, and the through hole is the ash dropping port 22. When the coking substances block the ventilation holes 7 on the grate 6, air can enter through the ash outlet 25, and then the air flow turns to the grate 6 under the obstruction of the wind guiding plate 26.

[0031] A second air distribution port 30 is provided at the left end of the grate 6, and the second air distribution port 30 is to the left of the push plate 13. The second air distribution port 30 is on the same side as the flue gas inlet of the gas combustion chamber 19. Through the above settings, the air entering from the second air distribution port 30 can directly participate in the combustion of the volatile matter in the gas combustion chamber 19, realizing air distribution for the combustion gas with a relatively high concentration of volatile matter, increasing the oxygen content, and facilitating the full combustion of the volatile matter in the gas combustion chamber 19.

[0032] In the present invention, the combustion heat release part and the heat exchange part are completely separated, avoiding heat loss during combustion and improving the combustion rate of the fuel. During operation, the induced draft fan operates, and the entire interior of the equipment is in a negative pressure state. The outside air is sucked in through the air inlet of the air inlet chamber 9. At the same time, fuel is filled into the fuel bin 5 through the automatic feeding port 10. The fuel falls to the right side of the push plate 13. The push plate 13 pushes the fuel, and the fuel burns while moving horizontally towards the coke removal mechanism on the right side. To make up for the insufficient air distribution of the grate 6 caused by the fuel coking and blocking the ventilation holes 7, an ash discharge port 25 and a wind guiding plate 26 are also provided to supply air for the full combustion of the solid fuel. Part of the coking substances and ashes formed during the combustion process are sheared by the coke removal mechanism and fall into the air inlet chamber 9 through the ash discharge port 25. When the solid fuel burns, volatile components are cracked out. The volatile components and hot air rise to the gas combustion chamber 19. The volatile components are fully burned and release heat in the gas combustion chamber 19. The hot flue gas in the gas combustion chamber 19 heats the heat storage plate 20 in the combustion chamber. The heat storage plate 20 stores heat fully, and the temperature of the heat storage plate 20 can reach 1100°C. To meet the air distribution of the gas combustion chamber 19, a second air distribution port 30 is provided. The second air distribution port 30 is located below the flue gas inlet of the gas combustion chamber 19. In this way, the air entering from the second air distribution port 30 is directly supplied into the gas combustion chamber 19 through the flue gas inlet. In this way, the vertical upward airflow of the combustion holes 29 and the parallel airflow of the serpentine channel of the volatile components form a disturbed airflow, ensuring the full combustion and heat release of the volatile components. Finally, the hot flue gas passes through the flue 2 above the gas combustion chamber and enters the heat exchange mechanism 3. The heat generated by the fuel combustion is brought into the heat exchange mechanism 3 for heat release. At the same time, the cold medium enters the heat exchange mechanism 3 from the end with the lowest flue gas temperature and exits from the place with the highest flue gas temperature for step-by-step heat exchange. The temperature of the discharged flue gas is reduced to absorb heat energy to the maximum extent. Further, the utilization rate of the fuel and the thermal efficiency are improved.

[0033] The roller shaft 23 of the cam 17 mechanism and the coke removal mechanism are both connected and driven by the same motor through a chain. Since the contents of volatile components and ash in different fuels are also different, the combustion speeds are also different. The combustion speed of fuels with low volatile components is relatively slow, and there are more solids after volatilization. Therefore, it is required to reduce the rotation speeds of the cam 17 and the roller shaft 23 of the coke removal mechanism, and the feeding should also be slowed down to ensure that the fuel does not accumulate at the coke removal roller shaft 23, and vice versa.

[0034] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A combustion furnace with a high combustion rate and low coking, characterized in that , it includes a combustion mechanism (1), a flue (2) and a heat exchange mechanism (3). A partition plate (4) is horizontally arranged in the middle of the combustion mechanism (1). A fuel bin (5) is arranged in the middle of the partition plate (4). The top of the fuel bin (5) is open. A grate (6) is arranged at the bottom of the fuel bin (5). Vent holes (7) are evenly distributed on the grate (6). The partition plate (4) divides the combustion mechanism (1) into upper and lower chambers. The upper part of the partition plate (4) is a combustion chamber (8), and the lower part of the partition plate (4) is an air inlet chamber (9). An anti-coking system is arranged in the combustion chamber (8). An automatic feeding port (10) is arranged on the side wall of the combustion chamber (8). The anti-coking system includes a pushing mechanism and a driving mechanism. The pushing mechanism is located above the grate (6). The pushing mechanism is located below the automatic feeding port (10). The driving mechanism drives the bottom end of the pushing mechanism to reciprocate along the grate (6). The combustion chamber (8), the flue (2) and the heat exchange mechanism (3) are connected in sequence; The pushing mechanism is located on the left side of the automatic feeding port (10). The pushing mechanism includes two push plates (13) arranged in a V shape, a sleeve (14) and a connecting rod (15). The connecting rod (15) is horizontally arranged in the combustion chamber (8). The tops of the push plates (13) are both connected to the sleeve (14). The sleeve (14) is sleeved on the connecting rod (15). The bottom ends of the push plates (13) are close to the upper surface of the grate (6). The driving mechanism is located between the two push plates (13). The driving mechanism drives the push plates (13) to swing left and right. An ash discharge port (25) is arranged at the right end of the grate (6).

2. The combustion furnace with a high combustion rate and low coking according to claim 1, characterized in that, the driving mechanism includes a motor and a cam (17). The outer edge of the cam (17) contacts the push plate (13). A rotating shaft (18) is arranged in the middle of the cam (17). The driving end of the rotating shaft (18) penetrates through the side wall of the combustion chamber (8) and is connected to the driving shaft of the motor. The motor drives the cam (17) to rotate.

3. The combustion furnace with a high combustion rate and low coking according to claim 2, characterized in that, a cylindrical gas combustion chamber (19) is arranged at the top of the combustion chamber (8). A plurality of layers of heat storage plates (20) are arranged in the gas combustion chamber (19). One side of the heat storage plate (20) is fixedly connected to the side wall of the gas combustion chamber (19). The heat storage plates (20) are mutually staggered to form a serpentine channel in the gas combustion chamber (19). The flue gas inlet of the gas combustion chamber (19) is located at the left end of the bottom of the gas combustion chamber (19). The flue gas outlet of the gas combustion chamber (19) is located at the top of the gas combustion chamber (19) and is connected to the flue (2). A dust falling area (21) is arranged between the gas combustion chamber (19) and the side wall of the combustion chamber (8). Ash falling ports (22) are arranged around the partition plate (4). The ash falling ports (22) are located below the dust falling area (21).

4. The combustion furnace with a high combustion rate and low coking according to claim 3, characterized in that, Above the grate (6), a coke removal mechanism is further provided. The coke removal mechanism is located above the right side of the grate (6). The coke removal mechanism includes a roller shaft (23) and a plurality of crushing knives (24). The crushing knives (24) are evenly distributed on the outer side wall of the roller shaft (23), and the outer edge of the crushing knife (24) is close to the right edge of the grate (6). Both ends of the roller shaft (23) are respectively connected to the front side wall and the rear side wall of the combustion chamber (8). The rear end of the roller shaft (23) passes through the rear side wall of the combustion chamber (8) and is connected to a motor.

5. The combustion furnace with high combustion rate and low coking as claimed in claim 4, characterized in that the crushing knives (24) are strip-shaped and distributed along the axial direction of the roller shaft (23). The longitudinal section of the crushing knife (24) is triangular. One side of the crushing knife (24) is connected to the roller shaft (23), and the other side of the crushing knife (24) is provided with a blade; the blade of the crushing knife (24) is curved, and the bending direction of the blade is the same as the rotation direction of the roller shaft (23).

6. The combustion furnace with high combustion rate and low coking as claimed in claim 5, characterized in that a secondary air distribution mechanism is further provided. The secondary air distribution mechanism includes a wind guiding plate (26) and a longitudinal partition plate (27). The wind guiding plate (26) is horizontally arranged above the ash discharge port (25). The top end and the bottom end of the longitudinal partition plate (27) are respectively connected to the wind guiding plate (26) and the partition plate (4).

7. The combustion furnace with high combustion rate and low coking as claimed in claim 6, characterized in that combustion holes (29) are provided on the heat storage plate (20), and the included angle between the wind guiding plate (26) and the horizontal plane is 25° - 45°.

8. The combustion furnace with high combustion rate and low coking as claimed in claim 7, characterized in that a second air distribution port (30) is provided at the left end of the grate (6), and the second air distribution port (30) is to the left of the push plate (13).

9. The combustion furnace with high combustion rate and low coking as claimed in claim 8, characterized in that the side walls of the combustion chamber (8) and the flue (2) are in a sealed state, and an induced draft fan is provided at the flue gas output end of the flue (2).

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