Auger-free feeding and anti-coking combustion mechanism of particle combustion furnace

Abstract

The anti-coking combustion mechanism comprises a furnace body and an ash chamber located below the furnace body, a particle bin is arranged on one side of the furnace body, a combustion hopper is installed on the lower portion of the furnace body, the combustion hopper is provided with two combustion hopper side walls and a combustion hopper bottom plate, the combustion hopper is inserted into a side opening of the side wall of the furnace body, and the combustion hopper bottom plate is arranged on the side wall of the furnace body. The top wall edge of the side opening of the furnace body is tightly attached to the top edge of the side wall of the combustion hopper, the bottom plate of the combustion hopper inclines inwards and downwards from the inserting end of the bottom plate of the combustion hopper, an ash falling hole is formed in the bottom plate of the combustion hopper, and the inserting end of the combustion hopper is connected with the particle bin through an obliquely-arranged particle conveying pipe. Granular fuel can be uniformly supplied into the furnace body, auger feeding is not needed, and the device has the advantages that sufficient combustion of the granular fuel can be achieved, the coking phenomenon is avoided, and the granular combustion efficiency is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of a particle combustion furnace, in particular to an auger-free feeding and anti-coking combustion mechanism of a particle combustion furnace. Background Art

[0002] Pellet combustion stoves are becoming more and more popular as industrial and household heating equipment; with their safety and hygiene advantages, they have gradually replaced the old combustion stoves that use coal as the main fuel.

[0003] The bottom of the pellet combustion furnace in the existing technology can be roughly divided into two categories. One is a flat grate with a high periphery to form a bowl-shaped chamber. Then the biomass is transported to the furnace through the auger and falls into the bowl-shaped chamber, for continuous feeding and continuous combustion. The fatal defect of this method is that after the biomass particles fall into the chamber through the auger, they will form a mountain-like pile with a high middle and low surroundings. The ventilation in the middle is poor, resulting in incomplete combustion due to lack of oxygen, and eventually forming a coking state. After coking, the ventilation is worse, and the worse the ventilation, the more serious the coking, forming a vicious circle. Eventually, the machine must be shut down for cleaning and then restarted for ignition, resulting in uninterrupted combustion. In order to change this fatal defect, many small pellet heating stoves now use a suspended combustion bowl, that is, the outlet of the feeding auger is directly parallel to the combustion bowl, and the particles transported by the auger are directly pushed into the combustion bowl. However, since the auger conveyors are all barrel-shaped, the pushed out particles are also piled up, which will also cause poor ventilation, incomplete combustion due to lack of oxygen and eventually coking. Summary of the invention

[0004] The technical problem of the present invention is to provide an auger-free feeding and anti-coking combustion mechanism for a particle combustion furnace, which can not only realize the auger-free conveying of biomass particles, but also allow the particles to fall freely into the combustion bucket more evenly, forming a layer of inclined particle material layer with uniform thickness, so that the ventilation is better and more uniform, and the coking problem caused by insufficient combustion of particles in the prior art is perfectly solved.

[0005] In order to solve the above technical problems, the present invention provides a auger-free feeding and anti-coking combustion mechanism for a particle combustion furnace, comprising a furnace body and an ash chamber located below the furnace body, and a particle silo is provided on one side of the furnace body, and its structural characteristics are: a combustion bucket is installed at the inner lower part of the furnace body, the combustion bucket has two combustion bucket side walls and a combustion bucket bottom plate, the combustion bucket is inserted into the side opening of the side wall of the furnace body, the top wall edge of the side opening of the furnace body is tightly arranged with the top edge of the combustion bucket side wall, the combustion bucket bottom plate is inclined inward and downward from its insertion end, and an ash dropping hole is provided on the combustion bucket bottom plate, the insertion end of the combustion bucket is tightly connected to the particle silo through an inclined particle conveying pipe, and the width of the particle conveying pipe is consistent with the width of the combustion bucket bottom plate.

[0006] After adopting the above structure, due to the provision of the above-mentioned inclined structure of the combustion bucket, the particles can rely on gravity to slide into the combustion bucket along the inclined particle conveying pipe. After the particles are burned, the white fine dust is formed and falls into the ash chamber through the ash falling hole. The particles will rely on gravity to continuously slide down to replenish. Since the top wall edge of the above-mentioned side opening is in contact with the top edge of the side wall of the combustion bucket, the thickness of the particles entering the fuel bucket is limited. Therefore, the thickness of the particles entering the combustion bucket will be relatively uniform, and the particles can cover the entire bottom plate of the combustion bucket, thereby ensuring the adequacy of the particle combustion. The present invention can make the particle fuel evenly put into the combustion bucket, thereby achieving the full combustion of the particle fuel, avoiding the coking phenomenon caused by insufficient combustion, and ensuring the thermal efficiency of the combustion and continuous combustion.

[0007] As an improvement of the present invention, a blocking plate capable of blocking the end of the combustion bucket is further provided in the furnace body. An upper bracket of the combustion bucket is installed in the furnace body, and the upper bracket of the combustion bucket is connected to the blocking plate so that the upper bracket of the combustion bucket, the blocking plate and the space below the bottom plate of the combustion bucket are connected to the ash chamber. An air inlet pipe connected to the fan is installed on the furnace body, and the inner end of the air inlet pipe extending into the furnace body is located in the space below the upper bracket of the combustion bucket, the blocking plate and the bottom plate of the combustion bucket. The height of the blocking plate is higher than the height of the inner end of the side wall of the combustion bucket, and a supplementary hole is provided on the section of the blocking plate higher than the side wall of the combustion bucket. The side wall of the combustion bucket and the furnace body are sealed with a sealing plate, so that the combustion chamber above the combustion bucket and the ash chamber below form a mutually isolated cavity, and the combustion chamber and the ash chamber can communicate with each other through the ash dropping hole and the oxygen supplement hole, so that the wind blown in by the fan can only be blown evenly onto the particles through the ash dropping port or the oxygen supplement hole for sufficient combustion.

[0008] As a further improvement of the present invention, a particle thickness regulating valve capable of adjusting the thickness of particles in the combustion bucket is installed in the furnace body. The particle thickness regulating valve comprises a rotating shaft connected to the furnace body or the combustion bucket and capable of rotating, one end of the rotating shaft extending out of the furnace body and a pull rod capable of rotating the rotating shaft is installed on the rotating shaft extending out of the furnace body, the pull rod is a manual pull rod or a pull rod driven by a servo motor and an electric proportional regulating valve, and is used to adjust the thickness of biomass particles falling onto the bottom plate of the combustion bucket, so as to coordinate with the fan to achieve the purpose of controlling the combustion intensity.

[0009] As a further improvement of the present invention, a furnace door is installed on one side wall of the ash chamber. A side furnace door is provided on the side wall of the furnace body, the side door being located higher than the upper bracket of the combustion bucket.

[0010] As a further improvement of the present invention, an anti-backfire air duct is connected to the air supply duct of the fan, the air outlet end of the anti-backfire air duct is connected to the rear end of the particle conveying pipe or the combustion bucket and the air outlet port is tilted to blow air downward.

[0011] In summary, the present invention can realize uniform supply of pellet fuel into the furnace body without the need for auger feeding, and has the advantages of realizing full combustion of pellet fuel, avoiding coking and ensuring pellet combustion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 A schematic diagram of the structure of an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the structure enlarged in the middle; Figure 3 for Figure 1 The schematic diagram of the structure is enlarged in the B direction; Figure 4 It is a schematic diagram of the structure of the connection between the combustion bucket and the sealing plate; In the figure, 1 is a furnace body; 2 is a furnace door; 3 is a side furnace door; 4 is a combustion bucket upper bracket; 5 is a blocking plate; 6 is a feeding hole; 7 is a combustion bucket; 71 is a combustion bucket bottom plate; 72 is a combustion bucket side wall; 8 is an ash drop hole; 9 is an ash chamber; 10 is an air inlet pipe; 11 is a fan; 12 is an anti-backfire air duct; 13 is a particle silo; 14 is a particle conveying pipe; 15 is a particle thickness regulating valve; 151 is a rotating shaft; 152 is a regulating valve plate; 16 is a sealing plate. DETAILED DESCRIPTION

[0013] As shown in the accompanying drawings; the present invention provides a particle combustion furnace without auger feeding and anti-coking combustion mechanism. For the convenience of description, the inner and outer directions in this embodiment refer to the inner cavity close to the furnace body. Figure 1 The left and right directions in the figure are the length directions of the furnace body. Figure 1 The direction perpendicular to the paper surface is the width direction of the furnace body, and each of the following connections can be understood as a direct connection or an indirect connection through other structures.

[0014] refer to Figures 1 to 4As shown, the present invention provides a best embodiment of an auger-free feeding and anti-coking combustion mechanism of a particle combustion furnace, which includes a furnace body 1 and an ash chamber 9 located below the furnace body 1. The furnace body 1 can be square or circular in the prior art, and a furnace door 2 is installed on one side wall of the ash chamber 9. A particle silo 13 is provided on one side of the furnace body 1, and the particle silo 13 can be of a funnel structure. A combustion bucket 7 is installed at the lower part of the furnace body 1. The combustion bucket 7 has two combustion bucket side walls 72 and a combustion bucket bottom plate 71, that is, the entire combustion bucket 7 is similar to the shape of a dustpan. The combustion bucket 7 is inserted into the side opening of the side wall of the furnace body 1, and the top wall edge of the side opening of the furnace body 1 is tightly arranged with the top edge of the side wall of the combustion bucket 7. The combustion bucket bottom plate 71 is inclined inward and downward from its insertion end, and an ash drop hole 8 is provided on the combustion bucket bottom plate 71. The insertion of the combustion bucket 7 The end is connected to the pellet silo 13 through an inclined pellet conveying pipe 14. The width of the pellet conveying pipe 14 is consistent with the width of the bottom plate of the combustion bucket 7. The pellet fuel is stored in the pellet silo 13 and slides down from the inclined pellet conveying pipe 14. After passing through the height limit setting at the above-mentioned side opening, the pellet fuel will enter the combustion bucket 7 with a fixed thickness. Since the bottom plate 71 of the combustion bucket is also inclined, the pellet fuel will slowly flow in with a set thickness and be evenly arranged on the bottom plate 71 of the combustion bucket to avoid incomplete combustion and coking due to accumulation. In this embodiment, the above-mentioned ash drop hole 8 is set on the middle and lower half of the bottom plate 71 of the combustion bucket, for example, it can be used Figure 2 In the structure, the ash-falling holes 8 arranged in the middle of the combustion bucket bottom plate 71 are multiple rows of circular holes, and the ash-falling holes 8 arranged on the lower section of the combustion bucket bottom plate 71 are long strip holes. The advantage of the above arrangement is that as the particle fuel slides down, the further it goes down, the faster and more fully it burns, further ensuring the complete combustion of the particles, and the long strip ash-falling is more thorough and smoother.

[0015] As shown in the accompanying drawings, the furnace body 1 is also provided with a blocking plate 5 that can block the inner end of the combustion bucket 7, that is, the blocking plate 5, the combustion bucket bottom plate 71 and the combustion bucket side wall 72 surround the combustion chamber of the particles; the furnace body 1 is installed with a combustion bucket upper bracket 4, the combustion bucket upper bracket 4 can adopt the plate structure shown in the figure, and can also adopt other structures, the purpose of which is to separate the combustion chamber (the chamber in the inner cavity of the furnace body where the particle fuel is burned and the chamber above it are called the combustion chamber) from the ash chamber below, and the combustion bucket upper bracket 4 is connected to the blocking plate 5 so that the combustion bucket upper bracket 4, the blocking plate 5 and the combustion bucket bottom plate The space below 71 is connected with the ash chamber, and an air inlet pipe 10 connected with a fan 11 is installed on the furnace body 1. The inner extending end of the air inlet pipe 10 extending into the furnace body 1 is located in the space below the combustion bucket upper bracket 4, the sealing plate 5 and the combustion bucket bottom plate 71; the height of the sealing plate 5 is higher than the height of the inner extending end of the side wall of the combustion bucket 7, and a supplementary hole 6 is provided on the section of the sealing plate 5 higher than the side wall of the combustion bucket 7; when the fan blows, a part of the oxygen-enriched air penetrates into the inner cavity of the combustion bucket 7 from the ash falling hole, and the other part enters the above-mentioned combustion chamber from the supplementary hole 6, and the combustion chamber and the ash chamber 9 can communicate with each other through the ash falling hole 8 and the oxygen supplementary hole 6. In this embodiment, for the safety performance of the entire combustion furnace, the air supply pipeline of the fan 11 is connected with an anti-backfire air duct 12, and the air outlet of the anti-backfire air duct 12 is connected to the rear end of the particle conveying pipe 14 or the combustion bucket 7, and the air outlet port is tilted downward to blow air. In the figure, the above-mentioned air outlet is connected to the particle conveying pipe 14, and the air outlet direction of the above-mentioned air outlet is tilted downward, which can prevent the flashback problem of the particle fuel and provide appropriate power for the particles to fall. The side wall of the furnace body 1 is provided with a side furnace door 3 whose position is higher than the upper bracket of the combustion bucket. Through the side furnace door 3, the combustion situation inside the combustion chamber can be observed, and the ash on the upper bracket 4 of the combustion bucket and other parts can be cleaned in time.

[0016] Referring to the accompanying drawings, in the embodiment provided by the present invention, a particle thickness regulating valve 15 capable of adjusting the thickness of particles in the combustion bucket 7 is installed in the furnace body 1. The particle thickness regulating valve 15 comprises a rotating shaft 151 connected to the furnace body 1 or the combustion bucket 7 and capable of rotating, one end of which extends out of the furnace body 1 and a pull rod capable of rotating the rotating shaft 151 is installed on the rotating shaft 151 extending out of the furnace body 1, and the pull rod is a manual pull rod or a pull rod driven by a servo motor and an electric proportional regulating valve, and is used to adjust the thickness of the biomass particles falling onto the bottom plate 71 of the combustion bucket. In this embodiment, one end of the rotating shaft 151 extends out of the furnace body, and can be manually or other power mechanisms. The setting angle and regular rotation of the rotating shaft are now controlled, that is, the above-mentioned servo motor and electric proportional control valve, the electrical connection structure of the servo motor and the electric proportional control valve is the prior art, which can control the setting angle of the rotating shaft. A support structure can be set on the side wall of the combustion bucket to limit the position of the rotating shaft 151. Of course, a corresponding rotating connection structure can also be set on the side wall of the furnace body 1 to install the rotating shaft 151. The rotating shaft 151 is equipped with a regulating valve plate 152 that swings with the rotation of the rotating shaft 151 and can extend into the inner cavity of the combustion bucket 7. Figure 1 The dotted line in the figure is the structure after the rotating shaft 151 rotates a certain angle and the regulating valve plate 152 extends into the inner cavity of the combustion bucket 7. When the regulating valve plate 152 fully extends into the inner cavity of the combustion bucket 7, the particle fuel can be cut off, that is, the combustion furnace can be cut off. When the regulating valve plate 152 partially extends into the inner cavity of the combustion bucket 7, the lower edge of the regulating valve plate 152 can limit the thickness of the particle fuel (the height between the lower edge of the regulating valve plate 152 and the bottom plate 71 of the combustion bucket is the thickness of the particle fuel). The fuel of this structure can be biomass particles, block coal with uniform particle size, and shaped coal after mechanical processing. Any material with uniform particles can be used.

[0017] The present invention is not limited to the above-mentioned embodiments. For those skilled in the art, equivalent changes and component replacements based on the specific structure of the present invention are all within the protection scope of the present invention.

Claims

1. A pellet combustion furnace with auger-free feeding and anti-coking combustion mechanism, comprising a furnace body (1) and an ash chamber (9) located below the furnace body (1), a pellet silo (13) being provided on one side of the furnace body (1), wherein: A combustion bucket (7) is installed at the lower part of the furnace body (1). The combustion bucket (7) has two combustion bucket side walls (72) and a combustion bucket bottom plate (71). The combustion bucket (7) is inserted into the side opening of the side wall of the furnace body (1). The top wall edge of the side opening of the furnace body (1) is closely arranged with the top edge of the combustion bucket side wall (72). The combustion bucket bottom plate (71) is inclined inwardly and downwardly from its insertion end and an ash drop hole (8) is provided on the combustion bucket bottom plate (71). The insertion end of the combustion bucket (7) is tightly connected to the particle silo (13) through an inclined particle conveying pipe (14). The width of the particle conveying pipe (14) is consistent with the width of the combustion bucket bottom plate (71).

2. The auger-free feeding and anti-coking combustion mechanism of the particle combustion furnace according to claim 1 is characterized in that: The furnace body (1) is also provided with a blocking plate (5) capable of blocking the inner end of the combustion bucket (7).

3. The auger-free feeding and anti-coking combustion mechanism of the particle combustion furnace according to claim 2 is characterized by: The furnace body (1) is provided with a combustion bucket upper bracket (4), the combustion bucket upper bracket (4) being connected to a sealing plate (5) so that the space below the combustion bucket upper bracket (4), the sealing plate (5) and the combustion bucket bottom plate (71) is connected to the ash chamber (9), and the furnace body (1) is provided with an air inlet pipe (10) connected to a fan (11), the inner end of the air inlet pipe (10) extending into the furnace body (1) is located in the space below the combustion bucket upper bracket (4), the sealing plate (5) and the combustion bucket bottom plate (71).

4. The auger-free feeding and anti-coking combustion mechanism of the particle combustion furnace according to claim 3 is characterized by: The height of the blocking plate (5) is higher than the height of the inwardly extending end of the combustion bucket side wall (72). An oxygen supply hole (6) is provided on the section of the blocking plate (5) higher than the side wall of the combustion bucket (7). The combustion bucket side wall (72) and the furnace body (1) are sealed by a sealing plate (16) so that the combustion chamber above the combustion bucket (1) and the ash chamber (9) below are isolated from each other. The combustion chamber and the ash chamber (9) can communicate with each other through the ash dropping hole (8) and the oxygen supply hole (6).

5. The auger-free feeding and anti-coking combustion mechanism of the particle combustion furnace according to any one of claims 1 to 4, characterized in that: A particle thickness regulating valve (15) capable of adjusting the thickness of particles in the combustion bucket (7) is installed in the furnace body (1).

6. The auger-free feeding and anti-coking combustion mechanism of the particle combustion furnace according to claim 5 is characterized by: The particle thickness regulating valve (15) comprises a rotating shaft (151) connected to the furnace body (1) or the combustion bucket (7) and capable of rotating. One end of the rotating shaft (151) extends out of the furnace body (1) and a pull rod is mounted on the rotating shaft (151) extending out of the furnace body (1) so as to enable the rotating shaft (151) to rotate. The pull rod is a manual pull rod or a pull rod driven by a servo motor and an electric proportional regulating valve, and is used to adjust the thickness of biomass particles falling onto the bottom plate (71) of the combustion bucket.

7. The auger-free feeding and anti-coking combustion mechanism of the particle combustion furnace according to any one of claims 1 to 4, characterized in that: A furnace door (2) is mounted on one side wall of the ash chamber (9).

8. The auger-free feeding and anti-coking combustion mechanism of the particle combustion furnace according to any one of claims 1 to 4, characterized in that: A side furnace door (3) is provided on the side wall of the furnace body (1) and is located higher than the upper bracket (4) of the combustion bucket.

9. The auger-free feeding and anti-coking combustion mechanism of the particle combustion furnace according to any one of claims 1 to 4, characterized in that: The air supply pipeline of the fan (11) is connected to an anti-backfire air duct (12), the air outlet end of the anti-backfire air duct (12) is connected to the rear end of the particle conveying pipe (14) or the combustion bucket (7), and the air outlet port is inclined to blow air downward.

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