CN210319995U

CN210319995U - Self-feeding biomass fuel furnace

Info

Publication number: CN210319995U
Application number: CN201920562831.6U
Authority: CN
Inventors: 李娜
Original assignee: Shandong Zhengxinde Environmental Protection Technology Development Co ltd
Current assignee: Shandong Zhengxinde Environmental Protection Technology Development Co ltd
Priority date: 2019-04-23
Filing date: 2019-04-23
Publication date: 2020-04-14
Anticipated expiration: 2029-04-23

Abstract

The utility model provides a self-feeding biomass fuel furnace belongs to the stove field, including furnace body, combustor, stuffing box, main grate and supporting bench. The furnace body is internally provided with a hearth, and the furnace wall is respectively provided with a filling opening communicated with the hearth and a furnace opening communicated with the hearth. The combustor comprises a gas collecting cylinder arranged in a hearth and a combustion cylinder arranged in a furnace mouth. The bottom of the stuffing box is communicated with the stuffing opening through a feeding control structure. The main grate is positioned at the bottom of the hearth and is provided with a bearing surface for bearing biomass fuel in the hearth, and an ash falling hole penetrating through the main grate is arranged on the bearing surface. The supporting table is arranged on the main fire grate and protrudes out of the bearing surface of the main fire grate. Can fall into the filler mouth through the biomass fuel of feeding control structure control in the packing box, reduce the intensity of labour who packs. The supporting table can occupy a part of space in the hearth, so that only less biomass fuel is combusted in the hearth at the same time, and the consumption of combusting the biomass fuel for a long time is reduced.

Description

Self-feeding biomass fuel furnace

Technical Field

The utility model belongs to the technical field of the stove, more specifically say, relate to a self-feeding biomass fuel stove.

Background

Usually, a large amount of biomass fuel can be filled into a hearth of the self-feeding biomass fuel furnace, and after the hearth is filled with the large amount of biomass fuel, the large amount of biomass fuel is combusted simultaneously, although a large amount of heat can be generated in a short time, frequent manual filling is needed due to the fact that the combustion speed is too high, and the labor intensity of an operator is high. And the consumption of the biomass fuel burning for a long time is very large, and for the condition that the fuel is saved and the burning time is prolonged without too much heat, for example, when daily heating is carried out, the existing self-feeding biomass fuel furnace is difficult to meet the use requirement.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a from feed biomass fuel stove to solve the too fast filler that leads to needing of feed biomass fuel stove combustion speed that exists among the prior art, operator intensity of labour is big, burns the too big technical problem of biomass fuel consumption for a long time moreover.

In order to achieve the above object, the utility model adopts the following technical scheme: there is provided a self-feeding biomass fuel furnace comprising:

the furnace body is internally provided with a hearth, and the furnace wall is respectively provided with a filling opening communicated with the hearth and a furnace opening communicated with the hearth;

the burner comprises a gas collecting cylinder and a combustion cylinder, wherein the gas collecting cylinder is arranged in the hearth, the gas inlet end of the gas collecting cylinder is used for collecting combustible gas, and the combustion cylinder is arranged in the hearth, and the gas inlet end of the combustion cylinder is communicated with the gas outlet end of the gas collecting cylinder;

the filling box is used for containing biomass fuel and is positioned above the filling opening, and the bottom of the filling box is communicated with the filling opening through a feeding control structure;

the main grate is positioned at the bottom of the hearth and is provided with a bearing surface for bearing the biomass fuel in the hearth, and an ash falling hole penetrating through the main grate is formed in the bearing surface; and

and the supporting table is arranged on the main grate and protrudes out of the bearing surface of the main grate.

Further, the central axis of the support table is parallel to and non-collinear with the central axis of the main grate.

Further, the supporting table is positioned at the eccentric position of the bearing surface of the main grate.

Furthermore, the convex surface of the supporting table is provided with a vent hole which penetrates through the supporting table and is communicated with the hearth and the ash storage cavity positioned below the hearth in the furnace body.

Furthermore, the bearing surface is provided with an installation hole penetrating through the main grate, and the supporting table is of a shell-shaped structure, the periphery of the supporting table is connected with the peripheral wall of the installation hole, and the middle of the supporting table protrudes out of the bearing surface.

Furthermore, the main grate is of a circular flat structure, and the bearing surface is formed on one side of the grate.

Further, the feeding control structure is a feeding resistance pipe, the upper end of the feeding resistance pipe is communicated with the bottom of the stuffing box, and the lower end of the feeding resistance pipe is communicated with the stuffing opening; the feed resistance tube has an inclined side wall for providing gliding resistance to the biomass fuel inside.

Furthermore, the side wall of the lower end of the feeding resistance pipe is provided with a dredging hole opposite to the filling opening.

Furthermore, the bottom of the stuffing box is provided with a blanking port communicated with the stuffing port, and the feeding control structure is a sealing plate which is in sliding connection with the stuffing box and used for adjusting the opening area of the blanking port.

Furthermore, the bottom of the stuffing box is provided with two parallel and opposite sliding grooves which are respectively located on two radial sides of the blanking port, two side edges of the sealing plate are respectively slidably located in the two sliding grooves, and the filling port is connected with a material receiving hopper with a feeding port located below the blanking port.

Further, the ventilation holes are respectively arranged on the top surface and the side surface of the supporting table.

Furthermore, the vent hole on the side surface of the supporting table is in a long strip shape, and the long axis of the vent hole is superposed with the bus of the supporting table.

Further, the convex surface of the supporting table is an arc convex surface.

Furthermore, the lower side of the main grate is provided with a support leg.

The utility model provides a from feed biomass fuel stove's beneficial effect lies in: compared with the prior art, the utility model discloses when using, put into the stuffing box with biomass fuel from feed biomass fuel stove, the stuffing box pass through the feed control structure with the filler opening intercommunication for can fall into the filler opening through the biomass fuel in the feed control structure control stuffing box, reduced the intensity of labour who packs. And main grate sets up in the furnace bottom, and the loading face is used for the bearing biomass fuel in the furnace, the supporting station protrusion in the loading face of main grate for the supporting station can occupy some spaces in the furnace, and the biomass fuel that can hold in the furnace reduces, makes only less biomass fuel burn simultaneously in the furnace, thereby has reduced the consumption of burning biomass fuel for a long time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a cross-sectional view of a self-feeding biomass fuel furnace according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a self-feeding biomass fuel furnace according to another embodiment of the present invention;

FIG. 3 is a bottom view of a stuffing box of the self-feeding biomass fuel furnace of FIG. 2;

FIG. 4 is a top view of the main grate and support table of FIGS. 1 and 2;

fig. 5 is a cross-sectional view taken at a-a in fig. 4.

Wherein, in the figures, the respective reference numerals:

1-furnace body; 11-a hearth; 12-a filling opening; 13-furnace mouth; 14-ash storage cavity; 2-a burner; 21-a gas collecting cylinder; 22-a combustion can; 3-a stuffing box; 41-feeding resistance pipe; 411-sloped sidewalls; 42-a sparse through hole; 43-blanking port; 44-closing plate; 45-chute; 46-a receiving hopper; 5-a main grate; 51-ash falling holes; 52-mounting holes; 6-a support table; 61-Vent hole.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 5, a self-feeding biomass fuel furnace according to an embodiment of the present invention will be described. The self-feeding biomass fuel furnace comprises a furnace body 1, a combustor 2, a stuffing box 3, a main grate 5 and a supporting table 6.

A hearth 11 is arranged in the furnace body 1, and a furnace wall is respectively provided with a filling opening 12 communicated with the hearth 11 and a furnace opening 13 communicated with the hearth 11. The burner 2 comprises a gas collecting cylinder 21 which is arranged in the hearth 11 and has a gas inlet end for collecting combustible gas and a combustion cylinder 22 which is arranged in the furnace mouth 13 and has a gas inlet end communicated with the gas outlet end of the gas collecting cylinder 21. The stuffing box 3 is used for containing biomass fuel and is positioned above the stuffing opening 12, and the bottom of the stuffing box is communicated with the stuffing opening 12 through a feeding control structure. The main grate 5 is arranged in the furnace body 1, positioned at the bottom of the hearth 11 and provided with a bearing surface for bearing biomass fuel in the hearth 11, and a plurality of ash falling holes 51 penetrating through the main grate 5 are arranged on the bearing surface. The supporting table 6 is arranged on the main grate 5 and protrudes out of the bearing surface of the main grate 5.

Compared with the prior art, the utility model discloses self-feeding biomass fuel stove is when using, puts into gland packing 3 with biomass fuel, and gland packing 3 passes through feeding control structure and 12 intercommunications of filler opening for can fall into filler opening 12 through the biomass fuel among the feeding control structure control gland packing 3, reduced the intensity of labour who packs. And main grate 5 sets up in furnace 11 bottom, and the bearing surface is used for bearing the biomass fuel in the furnace 11, and the bearing platform 6 protrusion in the bearing surface of main grate 5 for bearing platform 6 can occupy some spaces in the furnace 11, and the biomass fuel that can hold in the furnace 11 reduces, makes only less biomass fuel burn simultaneously in furnace 11, thereby has reduced the consumption of burning biomass fuel for a long time.

Specifically, the furnace body 1 may be a vertical cylinder or a rectangular parallelepiped, and a hearth 11 is formed inside the furnace body for burning biomass fuel. The furnace opening 13 is arranged on the top wall or the side wall of the furnace body 1 and is communicated with the hearth 11. The filling opening 12 is arranged on the top wall or the side wall of the furnace body 1 and is communicated with the hearth 11.

The gas collecting cylinder 21 and the combustion cylinder 22 are respectively cylindrical structures. The two open ends of the gas collecting cylinder 21 are respectively an air inlet end and an air outlet end, and the two open ends of the combustion cylinder 22 are respectively an air inlet end and an air outlet end. The air outlet end of the air collecting cylinder 21 is coaxially connected with the air inlet end of the combustion cylinder 22. The gas collecting cylinder 21 is installed in the hearth 11 of the biomass combustion furnace. The combustion cylinder 22 is installed in the furnace opening 13 of the biomass combustion furnace, and the gas outlet end of the combustion cylinder can be positioned in the furnace opening 13 or protrude out of the furnace opening 13.

The stuffing box 3 is installed on the side wall of the furnace body 1 and is positioned above the stuffing opening 12, and the bottom of the stuffing box is communicated with the stuffing opening 12 through the feeding control structure, so that fuel in the stuffing box 3 can downwards fall into the hearth 11 through the feeding control structure and the stuffing opening 12.

The main fire grate 5 can be the same as the existing fire grate structure, the main fire grate 5 is horizontally arranged in the furnace body 1 and is positioned below the hearth 11, a bearing surface is formed on the upper side surface of the main fire grate 5, an ash storage cavity 14 is formed below the main fire grate 5, biomass fuel is combusted in the hearth 11 above the main fire grate 5, and combusted ash and slag fall into the ash storage cavity 14 from an ash falling hole 51. The supporting table 6 can be made of refractory materials and fixed on the bearing surface of the main grate 5, and the supporting table 6 is positioned in the hearth 11 after the main grate 5 is installed in the furnace body 1, so that the space of biomass fuel in the hearth 11 is occupied, and the biomass fuel thrown into the hearth 11 is reduced.

When the biomass gasification furnace is used, enough biomass fuel is added into the stuffing box 3, then part of the biomass fuel in the stuffing box 3 falls onto the main furnace row 5 in the hearth 11 through the feeding control structure, the biomass fuel is buried at the air inlet end of the air collecting cylinder 21, then the biomass fuel in the hearth 11 is ignited, the biomass fuel is incompletely combusted, the biomass fuel is subjected to dry distillation, cracking and gasification to generate combustible gas with carbon monoxide, hydrogen, methane, carbon dioxide, nitrogen, hydrogen sulfide, water and the like as main components, the combustible gas enters the air collecting cylinder 21 from the air inlet end of the air collecting cylinder 21 and then flows to the air outlet end of the combustion cylinder 22, and the combustible gas in the combustion cylinder 22 is sprayed from the air outlet end and forms combustion after being ignited.

Referring to fig. 1, 2, 4 and 5, as an embodiment of the self-feeding biomass fuel furnace of the present invention, a supporting platform 6 is disposed on a portion of the main grate 5 for receiving the biomass fuel fed from the feeding port 12. The biomass fuel that filler opening 12 was filled in can pile up into biomass fuel pile on main grate 5, and this kind of setting makes the biomass fuel who fills in from filler opening 12 can drop to supporting platform 6 on, and supporting platform 6 squeezes the inside space of occupying biomass fuel pile, avoids inside being difficult to abundant burning of biomass fuel pile.

Specifically, the filling opening 12 is arranged on the side wall of the furnace body 1, and after the main grate 5 is horizontally arranged in the furnace body 1, the supporting table 6 is arranged on one side of the main grate 5 close to the filling opening 12. After being fed into the furnace 11 from the charging opening 12, the biomass fuel falls on the side of the support table 6 and the main grate 5 close to the charging opening 12, and covers the support table 6. The charging opening 12 may be provided at the top of the furnace body 1, and the support table 6 may be provided at a portion of the main grate 5 directly below the charging opening 12.

Referring to fig. 1, 2, 4 and 5, as an embodiment of the self-feeding biomass fuel furnace of the present invention, the central axis of the supporting table 6 is parallel to and not collinear with the central axis of the main grate 5. Specifically, the main grate 5 is circular, and the supporting table 6 is positioned at the eccentric position of the bearing surface of the main grate 5. The supporting table 6 is arranged at the eccentric position of the bearing surface of the main grate 5, so that when the main grate 5 is installed in the furnace body 1, the position of the main grate 5 is adjusted, the supporting table 6 can be close to the filling opening 12, and after the biomass fuel is put into the hearth 11 from the filling opening 12, the biomass fuel falls on the supporting table 6 and covers the supporting table 6.

Referring to fig. 1, 2, 4 and 5, as an embodiment of the self-feeding biomass fuel furnace of the present invention, a plurality of vent holes 61 are formed on the convex surface of the supporting platform 6, which penetrate through the supporting platform 6 and communicate the furnace 11 and the ash storage cavity 14 located below the furnace 11 in the furnace body 1. With the arrangement, air in the ash storage cavity 14 can enter the biomass fuel pile from the vent hole 61, so that the biomass fuel pile can be fully combusted.

Referring to fig. 4 and 5, as a specific embodiment of the self-feeding biomass fuel furnace of the present invention, a mounting hole 52 is formed on the supporting surface to penetrate through the main grate 5, and the supporting platform 6 is a shell-shaped structure with a periphery connected to the peripheral wall of the mounting hole 52 and a middle protruding from the supporting surface. This arrangement reduces the weight of the main grate 5 and the support 6 and saves material.

Referring to fig. 4 and 5, as an embodiment of the self-feeding biomass fuel furnace of the present invention, the main grate 5 is a circular flat structure, and a side plate forms a bearing surface; the support base 6 is a circular truncated cone shaped housing.

Specifically, the main grate 5 may be formed by cutting a steel plate into a circular shape, uniformly forming a plurality of ash falling holes 51 in the circular steel plate, and forming a mounting hole 52 by cutting a larger circular hole at an eccentric position of the main grate 5. The supporting table 6 is a shell with a small upper end and a large lower end, the upper end of the supporting table is closed, the lower end of the supporting table is opened, the periphery of the lower end of the supporting table is welded with the inner side wall of the mounting hole 52, and the small end of the supporting table 6 protrudes upwards out of the bearing surface of the main grate 5. The supporting table 6 is in a circular truncated cone shape, so that the supporting table 6 can occupy more space in the hearth 11, fuel can be saved more, the height of the supporting table 6 can be reduced, and interference between the supporting table 6 and the biomass burner 2 in the hearth 11 is avoided.

Referring to fig. 1, as a specific embodiment of the self-feeding biomass fuel furnace of the present invention, the feeding control structure is a feeding resistance pipe 41 whose upper end is communicated with the bottom of the stuffing box 3 and lower end is communicated with the stuffing opening 12; the feed resistance tube 41 has an inclined side wall 411 for providing a gliding resistance to the biomass fuel inside.

Specifically, the bottom of the stuffing box 3 is open, the upper end of the feeding resistance pipe 41 is open and is in butt joint with the bottom of the stuffing box 3, and one side of the lower end of the feeding resistance pipe 41 is in butt joint with a feed inlet on the side wall of the furnace body 1. The side wall of the feed resistance tube 41 opposite to the feed inlet is an inclined side wall 411. The upper end of the inclined side wall 411 is far away from the furnace body 1 and is connected with the side edge of the bottom of the stuffing box 3 far away from the furnace body 1, and the lower end of the inclined side wall is close to the furnace body 1 and is connected to the lower edge of the feed opening, so that the biomass fuel in the stuffing box 3 can slide into the feed opening along the inclined side wall 411 in the feed resistance pipe 41. After the biomass fuel in the furnace 11 is burnt out, the biomass fuel in the stuffing box 3 gradually slides into the furnace 11 along the feeding resistance pipe 41, after the biomass fuel in the furnace 11 is increased, the biomass fuel is gradually stacked to the feed opening, so that the feed opening generates certain resistance, the resistance is added with the resistance of the inclined side wall 411, the biomass fuel does not slide down along the inclined side wall 411 any more, after the biomass fuel in the furnace 11 is combusted, the resistance of the feed opening is reduced or even disappears, and the biomass fuel in the stuffing box 3 continues to slide down along the inclined side wall 411 to enter the furnace 11.

Referring to fig. 1, as an embodiment of the self-feeding biomass fuel furnace of the present invention, a through hole 42 is formed on a sidewall of a lower end of the feeding resistance tube 41 opposite to the filling opening 12. When in use, the long straight rod can be utilized to pass through the dredging hole 42 to dredge blocked biomass fuel or burnt slag and the like at the filling opening 12. The ventilation holes 42 can also supply air into the hearth 11 through the filling openings 12. Specifically, the through hole 42 may be disposed on a lower end of the inclined sidewall 411.

Referring to fig. 2 and 3 together, as a specific embodiment of the self-feeding biomass fuel furnace provided by the present invention, a blanking port 43 for communicating with the filling port 12 is provided at the bottom of the stuffing box 3, and the feeding control structure is a sealing plate 44 slidably connected to the stuffing box 3 and used for adjusting the opening area of the blanking port 43. During the use, slide seal plate 44 seals blanking port 43, fills up biomass fuel in gland box 3, when adding biomass fuel in furnace 11 in needs, opens blanking port 43 for biomass fuel in gland box 3 falls into gland 12 from blanking port 43, through the open area of control blanking port 43, controls the volume that biomass fuel dropped from blanking port 43.

Referring to fig. 2 and 3 together, as a specific embodiment of the self-feeding biomass fuel furnace provided by the present invention, the bottom of the stuffing box 3 is provided with two parallel and opposite sliding chutes 45, the two sliding chutes 45 are respectively located at two radial sides of the blanking port 43, two side edges of the sealing plate 44 are respectively slidably located in the two sliding chutes 45, and the stuffing port 12 is connected to a receiving hopper 46 with a feeding port located below the blanking port 43.

Specifically, the bottom plate of the stuffing box 3 is horizontal, and the blanking port 43 vertically penetrates through the bottom plate. Two sliding grooves 45 are arranged on the lower side of the bottom plate of the stuffing box 3, more specifically, two opposite side walls of the stuffing box 3 protrude from the lower side surface of the bottom plate of the stuffing box 3, and the two sliding grooves 45 are respectively arranged on the opposite inner side surfaces of the two side walls. The sealing plate 44 is disposed in parallel below the bottom plate of the stuffing box 3 and between the two sliding grooves 45, and two opposite side edges of the sealing plate 44 are inserted into the two sliding grooves 45 respectively to form a sliding connection.

Referring to fig. 4 and 5, as an embodiment of the self-feeding biomass fuel furnace of the present invention, the vent hole 61 has a plurality of holes respectively formed on the top surface and the side surface of the supporting table 6.

Specifically, the support table 6 is provided with a plurality of vent holes 61 penetrating the top face of the small end and a plurality of vent holes 61 penetrating the side face.

Referring to fig. 4 and 5, in an embodiment of the self-feeding biomass fuel furnace according to the present invention, the ventilation holes 61 on the side of the supporting table 6 are long, and the long axis of the ventilation holes 61 coincides with the generatrix of the supporting table 6.

As a specific implementation manner of the grate special for the self-feeding biomass fuel furnace provided by the utility model, the supporting platform 6 is a cone with a tip protruding out of the bearing surface. So that the biomass fuel falling on the supporting table 6 can slide along the conical surface of the supporting table 6 to the periphery, and the biomass fuel is prevented from being accumulated on the top of the supporting table 6. In particular, the support table 6 may be pyramidal or conical.

As a specific implementation mode of the special fire grate for the self-feeding biomass fuel furnace, the convex surface of the supporting platform 6 is an arc convex surface. This kind of setting can avoid biomass fuel to pile up on supporting platform 6, also can guarantee simultaneously that the volume is great for supporting platform 6 can occupy more spaces in furnace 11, the fuel economy that can be more, can also reduce the height of supporting platform 6 in addition, avoids supporting platform 6 and the interior biomass burner 2 of furnace 11 to interfere.

Specifically, the convex surface of the supporting table 6 may be a spherical surface or an irregular arc surface, for example, the supporting table 6 is a hemisphere protruding from the bearing surface, so that the biomass fuel falling on the supporting table 6 can slide down along the convex surface of the supporting table 6, and the biomass fuel is prevented from being excessively high on the supporting table 6.

As a concrete implementation mode of the special fire grate for the biomass fuel furnace, a fire-resistant layer is covered on the convex surface of the supporting platform 6. The support table 6 is protected from high temperature ablation and the refractory layer may be a refractory cement layer. More specifically, the raised surface of the support table is provided with raised connecting bars. When the fireproof cement layer is used, whether the fireproof cement layer needs to be manufactured or not can be determined according to the combustion temperature in the furnace body hearth, if the fireproof cement layer needs to be manufactured, the fireproof cement is coated on the convex surface of the supporting table, the connecting reinforcing steel bars are covered by the fireproof cement, and the connection firmness of the fireproof cement layer and the convex surface of the supporting table is increased. The fire-resistant cement layer completely wraps the connecting steel bars, so that the surface of the fire-resistant cement layer is smooth, and the biomass fuel can conveniently slide around.

More specifically, the supporting table 6 has a truncated cone shape; the connecting reinforcing steel bars are in strip shapes, and long axes of the connecting reinforcing steel bars are arranged in parallel to the bus of the supporting table 6. Due to the arrangement, when the biomass fuel slides down along the side surface of the supporting table 6, the resistance of the connecting steel bars to the biomass fuel is small, and the biomass fuel is prevented from being too high accumulated on the supporting table 6. The both ends of connecting reinforcement are fixed on the side of supporting platform 6 to form the clearance between middle part and the 6 sides of supporting platform, make during fire-resistant cement can get into this clearance, make the fire-resistant cement layer more firm with the protruding surperficial connection of supporting platform.

As a specific embodiment of the self-feeding biomass fuel furnace provided by the utility model, the lower side of the main grate 5 is provided with a support leg. By adopting the arrangement, the support legs can support the main grate 5, and the main grate 5 is prevented from sinking.

Specifically, the support legs can be supported on the furnace bottom or directly supported on the ground.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A self-feeding biomass fuel furnace, comprising:

the furnace body (1) is internally provided with a hearth (11), and the furnace wall is respectively provided with a filling opening (12) communicated with the hearth (11) and a furnace opening (13) communicated with the hearth (11);

the combustor (2) comprises a gas collecting cylinder (21) which is arranged in the hearth (11) and the gas inlet end of which is used for collecting combustible gas and a combustion cylinder (22) which is arranged in the furnace mouth (13) and the gas inlet end of which is communicated with the gas outlet end of the gas collecting cylinder (21);

the filling box (3) is used for containing biomass fuel and is positioned above the filling opening (12), and the bottom of the filling box is communicated with the filling opening (12) through a feeding control structure;

the main grate (5) is positioned at the bottom of the hearth (11) and is provided with a bearing surface for bearing the biomass fuel in the hearth (11), and an ash falling hole (51) penetrating through the main grate (5) is formed in the bearing surface; and

and the supporting table (6) is arranged on the main grate (5) and protrudes out of the bearing surface of the main grate (5).

2. The self-feeding biomass fuel furnace of claim 1, wherein: the supporting table (6) is arranged on the main grate (5) for receiving the biomass fuel filled from the filling opening (12).

3. The self-feeding biomass fuel furnace of claim 2, wherein: the central axis of the supporting table (6) is parallel to and not collinear with the central axis of the main grate (5).

4. The self-feeding biomass fuel furnace of claim 1, wherein: the supporting table (6) is provided with a vent hole (61) on the convex surface, wherein the vent hole runs through the supporting table (6) and is communicated with the hearth (11) and the ash storage cavity (14) below the hearth (11) in the furnace body (1).

5. The self-feeding biomass fuel furnace of claim 4, wherein: the bearing surface is provided with an installation hole (52) penetrating through the main grate (5), and the supporting table (6) is of a shell-shaped structure, the periphery of the supporting table is connected with the peripheral wall of the installation hole (52), and the middle of the supporting table protrudes out of the bearing surface.

6. The self-feeding biomass fuel furnace of claim 5, wherein: the main grate (5) is of a circular flat structure, and the bearing surface is formed on one side of the grate.

7. The self-feeding biomass fuel furnace of any one of claims 1 to 6, characterized in that: the feeding control structure is a feeding resistance pipe (41) with the upper end communicated with the bottom of the stuffing box (3) and the lower end communicated with the stuffing opening (12); the feeding resistance pipe (41) is provided with an inclined side wall (411) used for providing gliding resistance for the biomass fuel inside.

8. The self-feeding biomass fuel furnace of claim 7, wherein: and the side wall of the lower end of the feeding resistance pipe (41) is provided with a dredging hole (42) opposite to the filling opening (12).

9. The self-feeding biomass fuel furnace of any one of claims 1 to 6, characterized in that: the bottom of the stuffing box (3) is provided with a blanking port (43) communicated with the stuffing port (12), and the feeding control structure is a sealing plate (44) which is connected with the stuffing box (3) in a sliding manner and used for adjusting the opening area of the blanking port (43).

10. The self-feeding biomass fuel furnace of claim 9, wherein: the bottom of gland box (3) is equipped with two parallel relative spout (45), two spout (45) are located respectively the radial both sides of blanking mouth (43), the both sides limit gliding two of locating respectively of shrouding (44) in spout (45), filler mouth (12) are connected with the feed inlet and are located connect hopper (46) of blanking mouth (43) below.