Biomass pellet gasifier furnace core

Abstract

The present application discloses a biomass pellet gasification furnace core in the technical field of heating equipment, which includes an outer cylinder, a fire-collecting cylinder, and an inner cylinder fixed inside the outer cylinder. A wind guiding cavity is provided between the outer cylinder and the inner cylinder. A furnace bridge is provided at the bottom of the inner cylinder. A plurality of wind guiding holes are annularly arranged on the wall of the lower part of the inner cylinder. A heater facing the furnace hole also penetrates through the wall of the lower part of the inner cylinder. The outer cylinder is communicated with an air inlet pipe; the fire-collecting cylinder is fixed at the top of the outer cylinder. A smoke guiding cavity is provided in the wall of the fire-collecting cylinder. A smoke guiding hole for communicating the smoke guiding cavity with the furnace hole is provided on the inner wall of the fire-collecting cylinder. A long pipe is fixedly arranged on the outer wall of the outer cylinder along the vertical direction. One end of the long pipe extends upward and is communicated with the smoke guiding cavity, and the other end of the long pipe extends downward and is communicated with the base. By setting the fire-collecting cylinder, the long pipe, and the smoke guiding cavity, the smoke is introduced into the furnace hole again to continue burning by using the air pressure change, reducing the energy consumption. On the other hand, the generated smoke is continuously burned, effectively improving the burning rate of the biomass pellets.

Description

Technical Field

[0001] The present invention relates to the technical field of heating equipment, and particularly to a furnace core of a biomass pellet gasifier. Background Art

[0002] The biomass pellet gasifier uses biomass pellets as fuel. The biomass pellet gasifier is provided with a furnace core, an igniter and a air supply device. Generally, a blower is selected as the air supply device, and the blower is communicated with the furnace core. The igniter extends into the furnace core and ignites the fuel by direct heat transfer. During use, the biomass pellets are put into the furnace core, heated by the igniter, and the biomass pellets in the furnace core are ignited. Then the blower is started, and the air flow generated by the blower provides oxygen for the biomass pellets. After the biomass pellets are ignited, the igniter is turned off, and the air flow generated by the blower continuously provides oxygen for the biomass pellets, thereby realizing the continuous combustion of the biomass pellets. For example, the furnace core of the biomass pellet gasifier mentioned in the patent CN2020223729977 applied by the applicant earlier. A furnace core is provided in the furnace body. A furnace hole is provided in the middle of the furnace core. The furnace core includes an inner wall and an outer wall and an annular cavity between the two. An air supply hole is provided at the top of the cavity. An electric heater is provided in the furnace core. It also includes an ash box and a base. The ash box is slidably connected in the base. The furnace body is located above the base. The furnace core is communicated with the base. A smoke extraction mechanism is provided between the furnace core and the furnace body. The smoke extraction mechanism includes a long pipe, a smoke extractor and a dust collection box. The bottom of the long pipe is detachably connected to the base and communicated with the base. The dust collection box is located in the long pipe. The smoke extractor is communicated with the long pipe in the base. The top of the long pipe is detachably connected with a cover plate. Dust-proof holes are evenly distributed on the upper side wall of the long pipe.

[0003] During the combustion process, smoke will be generated, and it is necessary to use a smoke extraction mechanism to extract the smoke. On the one hand, the smoke is not utilized, resulting in a reduction in the combustion efficiency of the biomass pellets. On the other hand, there is energy consumption, which further increases the cost. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention designs a furnace core of a biomass pellet gasifier, which can effectively improve the combustion efficiency and reduce energy consumption.

[0005] The furnace core of the biomass pellet gasifier of the present invention includes a furnace core body communicated with a base. A furnace hole is provided in the middle of the furnace core body. The furnace core body includes an outer cylinder, a fire collecting cylinder and an inner cylinder fixed inside the outer cylinder. The outer cylinder, the fire collecting cylinder and the inner cylinder are coaxial and open at both ends. A wind guiding cavity is provided between the outer cylinder and the inner cylinder. A furnace bridge is provided at the bottom of the inner cylinder. A plurality of wind guiding holes are annularly arranged on the wall of the lower part of the inner cylinder. A heater facing the furnace hole also penetrates through the wall of the lower part of the inner cylinder. The outer cylinder is communicated with an air inlet pipe. The fire collecting cylinder is fixed on the top of the outer cylinder. A smoke guiding cavity is provided in the wall of the fire collecting cylinder. A smoke guiding hole for communicating the smoke guiding cavity with the furnace hole is provided on the inner wall of the fire collecting cylinder. A long pipe is fixed on the outer wall of the outer cylinder along the vertical direction. One end of the long pipe extends upward and is communicated with the smoke guiding cavity, and the other end of the long pipe extends downward and is communicated with the base.

[0006] The working principle of the present invention: For the biomass pellet gasifier of the present invention, biomass pellets are loaded into the furnace hole from the upper part of the fire collecting cylinder and intercepted in the furnace hole by the furnace bridge on the inner cylinder. After the feeding is completed, the heater is started to ignite the biomass pellets. Air containing oxygen is blown into the wind guiding cavity from the air inlet pipe by blowing air. The air then enters the furnace hole from the wind guiding holes, supplying oxygen to the biomass pellets and accelerating their combustion. Then the heater is turned off, and the blower continues to blow air. The air flow continuously provides oxygen for the biomass pellets, thereby realizing the continuous combustion of the biomass pellets. During the combustion process, incomplete combustion of the biomass pellets leads to the generation of smoke. Since one end of the long pipe outside the outer cylinder is communicated with the smoke guiding cavity and the other end is communicated with the base, under the pressure change brought by the temperature, pressure is generated, so that the smoke generated by combustion enters the smoke guiding cavity from the base through the long pipe and then enters the furnace hole through the smoke guiding hole to burn again, effectively improving the utilization rate of the fuel.

[0007] The beneficial effects of the present invention: The present invention mainly lies in the improvement of the furnace core. Specifically, the original smoking mechanism is removed, a fire collecting cylinder is arranged on the top of the outer cylinder, a long pipe is arranged on the side wall of the outer cylinder, a smoke guiding cavity communicated with the long pipe is arranged in the fire collecting cylinder, and the smoke is introduced into the furnace hole to continue burning by using the air pressure change. On the one hand, the original smoking mechanism is removed, reducing energy consumption. At the same time, the air flow can also enter the long pipe through the base and then flow into the smoke guiding cavity, supplying oxygen to the furnace hole in the middle of the fire collecting cylinder and accelerating its combustion. On the other hand, the generated smoke is continuously burned, effectively improving the utilization rate of biomass pellets.

[0008] Further, an ignition pipe penetrating through the inner cylinder and communicated with the furnace hole is sleeved in the air inlet pipe. There is a gap between the ignition pipe and the air inlet pipe. The heater is detachably connected inside the ignition pipe. The heating end of the heater is arranged close to the inner cylinder. The ignition pipe is provided with air inlet holes around the pipe body of the heater, and the air inlet holes are communicated with the inside of the ignition pipe.

[0009] Among them, the heater is an ignition rod, which includes an alumina ceramic ignition rod, a silicon nitride ignition rod, or any other form of electric igniter. By arranging an ignition tube in the air inlet pipe, placing the ignition rod therein, and then through the arrangement of the air inlet holes, the heat generated by the ignition rod is blown to the biomass particles under the action of the wind, and then the biomass particles are ignited by the action of the hot air. Since the ignition rod is arranged in the ignition tube, and the ignition tube is located in the air inlet pipe, on the one hand, it avoids directly putting the ignition rod into the furnace core and the risk of reducing the service life of the ignition rod due to being in a high-temperature environment for a long time; on the other hand, under the continuous action of the wind of the blower, the overall temperature in the ignition tube can also be reduced, which can also improve the service life of the ignition rod; thirdly, the outlet of the blower is directly connected to the air inlet pipe, and the air flow in the air inlet pipe and the air flow in the ignition tube are horizontal with the air flow generated by the blower, with the maximum wind loss being the smallest, and the manufacture and installation of the ignition tube are relatively convenient.

[0010] Further, one end of the wiring of the heater is threadedly connected or clamped to the ignition tube. This is the connection form between the ignition rod and the ignition tube, which facilitates the installation and disassembly of the ignition rod.

[0011] Further, the height of the inner cylinder is 0.5 to 1 times the height of the outer cylinder. The most preferred is 0.7 times, that is, the interval between the inner cylinder and the fire-collecting cylinder is relatively large, at least 0.5 times the height of the outer cylinder. By setting this interval, the length of the furnace holes is effectively increased, the feeding amount of biomass particles is increased, and the feeding times are reduced. Among them, the height of the inner cylinder being 0.7 times the height of the outer cylinder is the most preferred scheme of this application.

[0012] Further, the top of the inner cylinder is provided with a top plate fixed to the inner wall of the outer cylinder, and the top plate is inclined towards the center of the inner cylinder. The inclined top plate is conducive to the smooth flow of biomass particles to the furnace bridge at the bottom of the inner cylinder after continuous combustion, facilitating the ash discharge operation.

[0013] Further, a support ring fixed to the inner wall of the outer cylinder is provided in the middle of the inner cylinder.

[0014] Further, at least two groups of air supply holes are provided in a ring on the wall of the inner cylinder near the top plate.

[0015] Specifically, the air supply holes distributed in a ring on the inner wall are arranged in a staggered manner.

[0016] Setting two groups of air supply holes arranged in a ring facilitates oxygen supply to the biomass particles in the middle of the furnace core, increases the oxygen concentration in contact with the biomass particles, improves the combustion degree of the biomass particles, avoids the occurrence of incomplete combustion, and improves the combustion rate and calorific value of the biomass particles. And the staggered setting is more conducive to the rapid filling of oxygen throughout the furnace holes.

[0017] Furthermore, short pipes are provided on the outer wall of the outer cylinder. One end of each short pipe extends upward to communicate with the air guiding cavity, and the other end extends downward to communicate with the base. By adding two short pipes, the air flow enters the short pipes from the base and provides oxygen to the air supply holes along the air guiding cavity, increasing the oxygen content in the middle of the furnace holes and improving the combustion rate of the biomass particles.

[0018] Furthermore, the inner diameter of the inner cylinder below the support ring is smaller than that above the support ring. This setting can reduce the amount of biomass particles to be ignited and shorten the ignition time of the biomass particles.

[0019] Furthermore, the long pipe is a square column or a circular column. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a top view of the furnace core of the biomass particle gasification furnace of the present invention;

[0021] Figure 2 is Figure 1 a cross-sectional view taken along the line A-A in

[0022] Figure 3 is Figure 1 a cross-sectional view taken along the line B-B in

[0023] Figure 4 is Figure 1 a cross-sectional view taken along the line C-C in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following is a more detailed description through specific embodiments:

[0025] The reference numerals in the accompanying drawings of the specification include: air inlet pipe 1, fire collecting cylinder 2, inner cylinder 3, furnace holes 4, long pipe 5, furnace bridge 6, short pipe 7, outer cylinder 8, top plate 9, support ring 10, ignition pipe 11, ignition rod mounting port 12, air inlet holes 13, smoke guiding holes 21, smoke guiding cavity 22, first through hole 23, air supply holes 31, air guiding cavity 32, air guiding holes 33, second through hole 81.

[0026] Example 1 As Figures 1 to 4 shown, the furnace core of the biomass particle gasification furnace includes a furnace core body. A furnace hole 4 is provided in the middle of the furnace core body. The furnace core body includes an outer cylinder 8, a fire collecting cylinder 2, and an inner cylinder 3 welded inside the outer cylinder 8. The outer cylinder 8, the fire collecting cylinder 2, and the inner cylinder 3 are coaxial and open at both ends. An air guiding cavity 32 is provided between the outer cylinder 8 and the inner cylinder 3. A furnace bridge 6 is welded to the bottom of the inner cylinder 3. The outer cylinder 8 is communicated with an air inlet pipe 1; the fire collecting cylinder 2 is welded to the top of the outer cylinder 8. The outer diameter of the fire collecting cylinder 2 is equal to the outer diameter of the outer cylinder 8. A smoke guiding cavity 22 is provided in the wall body of the fire collecting cylinder 2. A smoke guiding hole 21 that communicates the smoke guiding cavity 22 with the furnace hole 4 is provided on the inner wall of the fire collecting cylinder 2.

[0027] AsFigure 2 As shown, two short tubes 7 are fixedly arranged on the outer wall of the outer cylinder 8 along the vertical direction. The two short tubes 7 are arranged opposite to each other. One end of the short tube 7 extends upward and communicates with the air guiding cavity 32 through the second through hole 81, and the other end of the short tube 7 extends downward and communicates with the base.

[0028] As Figure 3 shown, long tubes 5 are fixedly arranged on the outer wall of the outer cylinder 8 along the vertical direction. The two long tubes 5 are arranged opposite to each other. One end of the long tube 5 extends upward and communicates with the smoke guiding cavity 22 through the first through hole 23 opened on the outer wall of the fire concentrating cylinder 2, and the other end of the long tube 5 extends downward and communicates with the base.

[0029] As Figure 4 shown, an ignition tube 11 is sleeved inside the air inlet pipe 1 and penetrates through the inner cylinder 3 and communicates with the furnace hole 4. There is a gap between the ignition tube 11 and the air inlet pipe 1. An ignition rod installation port 12 is arranged inside the ignition tube 11. The ignition rod is threadedly connected to the ignition rod installation port 12. The heating end of the ignition rod is arranged close to the inner cylinder 3. Air inlet holes 13 are arranged on the tube body of the ignition tube 11 surrounding the ignition rod, and the air inlet holes 13 communicate with the inside of the ignition tube 11. The height of the inner cylinder 3 is 0.6 times the height of the outer cylinder 8. A top plate 9 fixed to the inner wall of the outer cylinder 8 is arranged at the top of the inner cylinder 3. The top plate 9 inclines towards the center of the inner cylinder 3, and the inclination angle of the top plate 9 with the horizontal direction is 10 - 15°.

[0030] A support ring 10 is arranged in the middle of the outer wall of the inner cylinder 3. The inner cylinder 3 is separated into an upper cylinder and a lower cylinder by the support ring 10. The inner diameter of the upper cylinder is larger than that of the lower cylinder. A plurality of air guiding holes 33 are arranged in a ring on the wall body of the lower cylinder. Two groups of air supplement holes 31 are arranged in a ring on the wall body of the upper cylinder close to the top plate 9. The two groups of air supplement holes 31 arranged on the inner wall are arranged in a staggered manner.

[0031] The difference between Example 2 and Example 1 is only that one end of the wiring of the ignition rod is clamped to the ignition rod installation port 12 on the ignition tube 11.

[0032] The difference between Example 3 and Example 1 is only that the height of the inner cylinder 3 is 0.7 times the height of the outer cylinder 8.

[0033] The difference between Example 4 and Example 1 is only that the height of the inner cylinder 3 is 0.5 times the height of the outer cylinder 8.

[0034] In specific implementation, taking Embodiment 1 as an example, biomass pellets are loaded into the furnace hole 4 from the upper part of the fire concentrating cylinder 2. The furnace bridge 6 can block the biomass pellets to prevent them from falling. Start the ignition rod and the blower. The blower generates wind, and the heat generated by the ignition rod forms hot air through the air guiding hole 33 and is sent to the biomass pellets in the furnace hole 4 to ignite the biomass pellets. Then, turn off the ignition rod, and the blower continues to blow air. The air flow continuously provides oxygen for the biomass pellets through the air supply hole 31, thereby realizing the continuous combustion of the biomass pellets. During the combustion process, the incomplete combustion of the biomass pellets causes the generation of smoke. Since one end of the long tube 5 outside the outer cylinder 8 is communicated with the smoke guiding cavity 22, and the other end of the long tube 5 is also communicated with the base, under the pressure change caused by the temperature, pressure is generated, so that the smoke generated by combustion enters the smoke guiding cavity 22 from the base through the long tube 5, and then enters the furnace hole 4 through the smoke guiding hole 21 for re-combustion, effectively improving the utilization rate of the fuel.

[0035] The above are only the embodiments of the present invention. Common knowledge such as the specific structures and characteristics known in the solutions is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. Biomass pellet gasifier furnace core, including a furnace core body communicated with a base, wherein a furnace hole is arranged in the middle of the furnace core body, and it is characterized in that: The furnace core body includes an outer cylinder, a fire concentrating cylinder, and an inner cylinder fixed inside the outer cylinder. The outer cylinder, the fire concentrating cylinder, and the inner cylinder are coaxial and open at both ends. A wind guiding cavity is provided between the outer cylinder and the inner cylinder. A furnace bridge is provided at the bottom of the inner cylinder. A number of wind guiding holes are annularly arranged on the wall of the lower part of the inner cylinder. A heater penetrating towards the furnace hole is also provided on the wall of the lower part of the inner cylinder. The outer cylinder is communicated with an air inlet pipe; the fire concentrating cylinder is fixed at the top of the outer cylinder. A smoke guiding cavity is provided in the wall of the fire concentrating cylinder. A smoke guiding hole for communicating the smoke guiding cavity with the furnace hole is provided on the inner wall of the fire concentrating cylinder. A long pipe is fixed on the outer wall of the outer cylinder along the vertical direction. One end of the long pipe extends upwards and is communicated with the smoke guiding cavity, and the other end of the long pipe extends downwards and is communicated with the base.

2. The furnace core of the biomass pellet gasifier according to claim 1, wherein: An ignition pipe penetrating through the inner cylinder and communicated with the furnace hole is sleeved in the air inlet pipe. There is a gap between the ignition pipe and the air inlet pipe. The heater is detachably connected in the ignition pipe. The heating end of the heater is arranged close to the inner cylinder. Air inlet holes are provided on the pipe body of the ignition pipe surrounding the heater. The air inlet holes are communicated with the inside of the ignition pipe.

3. The furnace core of the biomass pellet gasifier according to claim 2, characterized in that: One end of the heater for wiring is threadedly connected or clamped with the ignition pipe.

4. The biomass pellet gasifier furnace core according to claim 3, characterized in that: The height of the inner cylinder is 0.5 to 1 times the height of the outer cylinder.

5. The biomass pellet gasifier hearth according to claim 4, characterized in that: A top plate fixed to the inner wall of the outer cylinder is provided at the top of the inner cylinder. The top plate is inclined towards the center of the inner cylinder.

6. The biomass pellet gasifier hearth according to claim 5, characterized in that: A support ring fixed to the inner wall of the outer cylinder is provided in the middle of the inner cylinder.

7. The hearth of the biomass pellet gasifier according to claim 6, characterized in that: At least two groups of air supply holes are annularly arranged on the wall of the inner cylinder close to the top plate.

8. The hearth of the biomass pellet gasifier according to claim 7, wherein: The air supply holes distributed annularly on the inner wall are arranged in a staggered manner.

9. The biomass pellet gasifier furnace core according to claim 8, characterized in that: A short pipe is also provided on the outer wall of the outer cylinder. One end of the short pipe extends upwards and is communicated with the wind guiding cavity, and the other end of the short pipe extends downwards and is communicated with the base.

10. The hearth of the biomass pellet gasifier according to claim 9, characterized in that: The inner diameter of the inner cylinder below the support ring is smaller than the inner diameter above the support ring.

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