WO2009043213A1

WO2009043213A1 - Solid fuel combustion furnace

Info

Publication number: WO2009043213A1
Application number: PCT/CN2007/070828
Authority: WO
Inventors: Zhanbin Che
Original assignee: Zhanbin Che
Priority date: 2007-09-29
Filing date: 2007-09-29
Publication date: 2009-04-09

Abstract

A solid fuel combustion furnace at least includes a combustion chamber (1), a grate (2) and an air supply pipe (3). The grate (2) has an arching ridge part (21). The air supply pipe (3) is disposed under the ridge part (21) of the grate (2) and provided with an air inlet (32) and an upper air outlet (31) facing the ridge part (21).

Description

Instructions Solid fuel burner

#细 or

[1] The present invention relates to a device for burning a solid fuel, and more particularly to a solid fuel burner.

[2] Conventional solid-burning furnaces generally include a furnace, a furnace, and a ash collection chamber disposed below the furnace. The solid fuel is directly added to the furnace above the furnace for combustion. During the combustion of solid fuel, the wind and combustion products entering from below the furnace flow in the same direction and directly discharge the high temperature furnace. If the air volume entering from the furnace is too small, the amount of air in the furnace is insufficient, which will cause anaerobic combustion or failure. The high temperature required for combustion is achieved, the combustion is incomplete, black smoke is generated, and the combustion efficiency is lowered. If the air volume is increased, the strong air flow will quickly discharge the flue gas from the furnace, and the flue gas stays in the furnace for a short time, and The uneven mixing with the air makes the combustible components in the flue gas not fully burned, which will also cause the generation of black smoke and the reduction of combustion efficiency. At the same time, in the conventional solid combustion furnace, the fuel ash and fuel cannot be layered,

As a result, the volatile matter is not fully combusted and the combustion residue dust is directly discharged into the exhaust gas with the strong hot gas flow, causing discharge pollution.

[3] The conventional solid-burning furnace also has the problem that the large-volume fuel can not be burned out, causing the problem of forced dusting and the problem of coking of the grate, which not only causes trouble for the user, but also performs forced sparing. The ash will take away some of the fuel, which will reduce the combustion efficiency.

[4] Therefore, it is necessary to provide a solid fuel burner to overcome the above-mentioned drawbacks of conventional solid fuel burners.

[5] It is an object of the present invention to provide a solid fuel combustion furnace which is capable of improving combustion efficiency and reducing emission pollution.

[6] The above object of the present invention can be achieved by the following technical solution: A solid fuel combustion furnace, the combustion furnace comprising:

[7] furnace, which has a furnace mouth;

[8] a furnace, which is placed under the furnace and has a raised ridge; a supply duct disposed below the ridge of the furnace and having an air inlet and an upper air outlet, wherein the upper air outlet faces the ridge.

In a preferred embodiment of the invention, the ridges of the furnace are inclined in the height direction, and the air duct is also inclined with the ridges.

In a preferred embodiment of the present invention, the upper air outlet of the air supply duct faces the upper portion of the ridge, and the lower air outlet of the lower portion of the ridge is provided on the side wall of the air supply duct.

In a preferred embodiment of the invention, a flap may be disposed above the upper air outlet to prevent the ash from falling into the air duct from the upper air outlet.

In a preferred embodiment of the present invention, the lower air outlet on the side wall of the air supply duct is also provided with a flap to prevent the ash from entering the air supply duct through the lower air outlet.

In an alternative embodiment, the burner may further include a fan having a forced air supply to the air supply duct. In a preferred embodiment, the air supply duct is a tapered tube.

As a specific embodiment of the furnace, the furnace has a triangular or arched shape with an open lower end or a frustum shape with an open lower end.

In an alternative embodiment, a tubular passage is provided above the ridge in the furnace, the tubular passage having an upper port and a lower port, wherein the lower port of the tubular passage faces the ridge of the furnace, the tubular passage The upper port faces the mouth of the furnace, so that part of the air supplied by the air supply duct and the volatile matter generated by the combustion on the furnace enter the air supply duct, and after being fully mixed, a high-temperature open flame is formed at the upper port of the air supply duct to keep the inside of the furnace High temperature combustion state, improve combustion efficiency.

In an optional embodiment of the present invention, a solid fuel zone and a gaseous zone communicating with the solid fuel zone are formed in the furnace, the furnace is connected to a lower end of the solid fuel zone, the furnace mouth Located in the upper part of the gas zone, the upper part of the furnace has a feed port.

In this alternative embodiment, the tubular passage extends upwardly from the lower port toward the gaseous region and the upper port is located within the gaseous region.

In a preferred embodiment of the embodiment, the feed port is directly connected to the furnace, so that the solid fuel fed from the feed port directly falls to the bottom of the furnace, and is deposited as a solid fuel zone in the lower portion of the furnace. The upper portion of the furnace above the solid fuel zone is formed as a gaseous zone. [21] In another preferred embodiment of the alternative embodiment, a tank is connected below the feeding port, and the furnace is formed at the bottom of the tank, so that the space in the tank is formed. In the solid fuel zone, the bottom of the furnace space outside the tank is closed to form a gaseous zone.

[22] In the preferred embodiment, the lower port of the tubular passage is attached to the side wall of the bin.

[23] In the preferred embodiment, the upper portion of the tank is closed and the lower portion has a venting opening communicating with the gaseous region.

[24] As a specific example, the side edges of the grate can be folded up and connected to the bin to form a lower portion of the grate, and a gap of the grate is formed as the vent hole.

In an alternative embodiment of the invention, a blow duct may be provided outside the furnace, the outlet of the blow duct being located at an upper exit position, thereby forming a gaseous combustion port at the upper exit position. In this embodiment, a casing is provided in the furnace casing, and the inlet passage is formed between the casing and the outer wall of the furnace, and a damper for introducing air is opened at a lower portion of the casing.

[26] In the present invention, the furnace includes a plurality of grate bars, wherein each grate bar has a shape of high and low undulations, thereby further increasing the surface area of the grate, and the shape of the undulations is also favorable. The fall of the ash.

[27] As a preferred embodiment, the high and low undulating shape of the grate on the grate is arranged such that the position adjacent to the height of the grate is low, and adjacent to the lower part of the grate The positions are all formed high, which is beneficial to the reasonable distribution of solid fuel on the furnace, and in the combustion process of the fuel, the ash can automatically fall along the lower part of the grate to form automatic ash.

[28] In a specific embodiment, the grate can be formed into a undulating shape such as a wave shape, a zigzag shape, or a spiral shape.

The solid fuel burner of the present invention has advantages over the prior art in that: 1) since the furnace of the present invention has a raised ridge, it has a larger surface area than the existing flat furnace. The wind speed from the furnace into the furnace is reduced, the area of contact between the fuel and the air is increased, and the fuel can be burned layer by layer from the bottom to the top, which not only contributes to the full burnout of the lower fuel, improves the combustion efficiency, and the wind speed is lowered and The surface area of the fuel contact is increased, so that the fuel on the furnace has a lower temperature, thereby avoiding the problem of grate coking, and the fuel in the upper part of the solid fuel zone is always in a dry state instead of the burned ash, which ensures The ash does not rise to the upper outlet and is vented to the atmosphere with the exhaust gas, thereby reducing emissions. And, since the air supply duct which is inclined upward with the ridge is provided below the furnace, the air supply duct is provided from the air supply duct The air supplied by the upper air outlet can increase the amount of oxygen above the ridge of the furnace, forming a high-temperature combustion zone above the ridge of the furnace, thereby providing a high-temperature environment for the combustion of gaseous volatiles in the upper part of the furnace, the lower fuel The gaseous flammable volatiles produced by the combustion can be fully burned in the high temperature environment, the combustion efficiency of the combustion furnace is improved, and the emission pollution is reduced.

[30] 2) Since the air supply duct has an upper air outlet toward the upper part of the ridge and a lower air outlet toward the lower part of the ridge, when the air is blown into the air supply duct by the fan, the upper air outlet of the air supply duct and The airflow generated at the lower air outlet can form a vortex on the furnace to generate a downward airflow on the furnace, thereby removing the ash on the furnace and realizing automatic ash removal.

[31] 3) Since a tubular passage can be provided above the ridge of the furnace, the airflow replenished from the air supply duct causes the gaseous volatiles generated by the combustion of the lower fuel to fully mix with the airflow into the tubular passage, in the tubular The upper port position of the channel forms a high-temperature combustion zone, so that the gaseous volatiles can be burned more fully, thereby further improving combustion efficiency and reducing emission pollution.

[32] 4) Since the grate of the furnace knot of the present invention has a high and low undulating shape, the furnace has a larger surface area than the existing grate structure having a cylindrical grate, thereby further reducing The wind speed from the furnace into the furnace, and the contact area between the solid fuel and the air on the furnace is improved; and the high and low undulating shape of the grate is also beneficial to the solid fuel in the combustion process as the volume decreases The high point moves to the lower part, and the ash is automatically squeezed and dropped during the moving process to form an automatic annealing, which avoids the forced ashing problem of the existing furnace.

Country deletion

The following drawings are merely illustrative of the structure of the invention and are not intended to limit the scope of the invention. among them,

1 is a schematic structural view of a solid fuel combustion furnace of the present invention;

2 is a schematic structural view of another solid fuel burning furnace of the present invention;

Figure 3 is a schematic view of a furnace structure of the present invention;

Figure 4 is a schematic view showing another structure of the furnace of the present invention;

Figure 5 is a schematic view showing another structure of the furnace of the present invention;

[39] FIG. 6 is a schematic structural view of a furnace bar of the present invention having a high and low undulating shape;

[40] FIG. 7 is a schematic structural view showing a state in which a wavy grate is placed in a plane; [41] FIG. 8 is a schematic view of a grate having a spiral high and low undulating shape according to the present invention;

Figure 9 is a schematic structural view of a supply duct and a furnace of the present invention;

[43] FIG. 10 is a schematic structural view of another air supply duct and a furnace of the present invention;

Figure 11 is a schematic view showing the combined structure of the air supply duct, the furnace, the material box and the tubular passage of the present invention.

difficult

As shown in Figs. 1 to 11, the solid fuel combustion furnace of the present invention comprises at least a furnace 1, a furnace 2 and a supply duct 3. 1 - 2, the furnace 1 has a furnace opening 11, the furnace 2 is disposed below the furnace 1, and has a raised ridge 21 (as shown in Figures 3 - 5); The air supply duct 3 is disposed below the ridge 21 of the furnace 2, and has an air inlet 32 and an upper air outlet 31, wherein the upper air outlet 31 faces the ridge 21, and the air supply opening 32 protrudes outside the ridge 21. . Other structures of the solid fuel combustion furnace of the present invention, such as the ash collecting chamber 4, the damper on the ash collecting chamber 4, the heat insulating structure outside the furnace 1, etc., may be the same as the prior art, and will not be described in detail herein.

[46] In the use of the solid fuel combustion furnace of the present invention, a part of the wind enters the furnace 1 through the furnace 2, and another part of the wind is supplied to the combustion zone above the ridge 21 through the upper air outlet 31 of the air supply duct 3. Thus, since the furnace 2 has the raised ridges 2 (see FIGS. 3 to 5), it has a larger surface area than the existing flat furnace, and the wind speed from the furnace 2 into the furnace 1 is lowered, and The contact area with the underlying fuel is increased, and the fuel can be burned layer by layer from the bottom to the top, which not only contributes to the full burnout of the lower fuel, improves the combustion efficiency, and causes the furnace 1 due to the decrease in the wind speed and the surface area in contact with the fuel. The fuel on the lower temperature avoids the problem of coking and keeps the solid fuel in the upper part in a dry state instead of the burned ash, ensuring that the ash does not rise to the furnace opening 11 and is discharged into the atmosphere with the exhaust gas. Medium, thereby reducing emissions pollution. Further, the air supplied from the upper air outlet 31 of the air supply duct 3 can increase the amount of oxygen above the ridge 21 of the furnace 2, forming a high-temperature combustion zone above the ridge 21 of the furnace 2, thereby being in the upper portion of the furnace 1. The high temperature environment required for the combustion of the gaseous volatiles is provided, and the combustible volatiles generated by the combustion of the lower fuel can be fully burned in the high temperature environment, the combustion efficiency of the combustion furnace is improved, and the emission pollution is reduced.

As shown in FIG. 1 to FIG. 5, in a preferred embodiment of the present invention, the ridge portion 21 of the furnace 2 is tiltably disposed in the height direction, and the air supply duct 3 is also disposed obliquely upward with the ridge portion. Therefore, the airflow is facilitated to flow along the ridge portion 21, and the combustion products are sufficiently mixed with the wind filled in the upper air outlet 31 of the air supply duct 3 to improve combustion efficiency. . Moreover, the inclined ridge portion 21 is also advantageous for the solid fuel to move as the volume is reduced and the supporting force is weakened during the combustion process, thereby facilitating the falling of the ash.

As shown in FIG. 9 to FIG. 10, in a preferred embodiment of the present invention, the upper air outlet 31 of the air supply duct 3 is disposed to face the upper portion of the ridge 21 on the side of the air supply duct 3. The lower portion of the wall facing the ridge 21 has a lower air outlet 33 so that a part of the wind entering the air supply duct 3 can be supplied to the solid fuel above the furnace 2 through the lower air outlet 33. As shown in Fig. 9, the lower air outlet 33 may be constituted by only one large opening; as shown in Fig. 10, the lower air outlet 33 may also include a plurality of smaller openings.

In a preferred embodiment, as shown in FIG. 9 to FIG. 10, a flap 311 may be disposed above the upper air outlet 31 to prevent the ash from falling into the air supply duct 3 from the upper air outlet. Inside, affecting ventilation performance. A flap may also be provided on the lower air outlet 33 on the side wall of the air supply duct 3 to prevent the ash from entering the air supply duct 3 through the lower air outlet 33 to affect the ventilation performance.

[50] As shown in FIG. 2, in the preferred embodiment of the present invention, the combustion furnace may further include a fan 34 for forcibly supplying air into the air supply duct 3, so that when the furnace needs to raise the temperature, the fan 34, the strong wind is directly sent to the combustion zone above the furnace 2 through the upper air outlet 31 and the lower air outlet 33 of the air supply duct 3 to assist combustion; when the furnace 1 needs to lower the temperature, such as a fire seal, the dust chamber can be closed. The damper, natural wind can enter the combustion zone above the furnace 2 through the air duct 3, which avoids excessive combustion of the fuel and maintains the necessary temperature for the fuel to not extinguish the fire. Further, when the forced air is blown by the blower 34, the airflow generated at the upper air outlet 31 and the lower air outlet 33 of the air supply duct 3 can form a vortex, and a downward airflow is generated on the furnace 2, thereby cleaning the furnace. The ash on 箅2 is conducive to automatic ash removal.

[51] In the present invention, the shape of the air supply duct 3 may be set to various shapes as needed, as long as the wind can be supplied from the air inlet 32 to the upper air outlet 31 and the lower air outlet 33, and the specific structure thereof No restrictions are allowed. In a preferred embodiment, as shown in Figures 9 and 10, the air supply duct 3 may be a tapered tube. As shown in Fig. 9, the air supply duct 3 may be connected by two or more air ducts; as shown in Fig. 10, the air supply duct 3 may also be constituted by a duct.

In the present invention, the shape of the grate 2 may be various, as long as the ridge portion 21 has a ridge, and the specific structure is not limited in the present invention. For example, in a specific example, as shown in FIG. 3, the cross section of the furnace ₂ may be a triangle having a lower end opening, and the apex of the triangle is formed as the ridge 21; as shown in FIG. In another specific example, the section of the furnace 2 may be arched, the top of the arch The ridge portion 21 is formed as shown in FIG. 5. In still another specific example, the cross section of the furnace 2 is a truncated cone shape having a lower end opening, and an upper end surface of the frustum is formed as the ridge portion 21. In the examples of Figs. 3 to 5, although only an example in which one ridge 21 is provided on the furnace 2 is given, it is understood that the ridges 21 of the ridges may be provided with two or more as needed. , will not be detailed here.

As shown in FIG. 1 and FIG. 11, in an alternative embodiment, a tubular passage 5 is provided above the ridge 21 in the furnace 1, and the tubular passage 5 has an upper port 51 and a lower port 52. Wherein, the lower port 52 of the tubular passage 5 faces the ridge 21 of the furnace 2, the upper port 31 of the tubular passage 3 faces the furnace opening 11, so that the air generated by the air duct 3 and the airflow generated above the furnace 2 The volatiles generated by the combustion can enter the tubular passage 3, and after thorough mixing, a high-temperature open flame is formed at the upper port 31 of the tubular passage 3, so that the furnace 1 maintains a high-temperature combustion state, thereby improving combustion efficiency.

As shown in FIG. 1 to FIG. 2, as a preferred embodiment of the furnace structure of the present invention, a solid fuel zone 12 and a gaseous zone 13 communicating with the solid fuel zone 12 are formed in the furnace 1 The furnace 2 is connected to the lower end of the solid fuel zone 12, the furnace mouth 11 is located at the upper part of the gas zone 13, and the upper part of the furnace 1 has a feed port 14 so that the solid fuel and the combustible volatiles generated by the combustion are respectively The solid fuel zone 12 and the gas zone 13 are stratified for combustion to improve combustion efficiency. Of course, the furnace structure of the solid fuel combustion furnace of the present invention is not limited to the above structure, and various conventional furnace structures can also be used, and detailed descriptions thereof will not be repeated here.

In the preferred embodiment, as shown in FIG. 1, the tubular passage 3 can extend upward from the lower port 32 toward the gaseous region 13, and the upper port 31 is located in the gaseous region 13, thereby being in the gaseous region 13 The high-temperature combustion zone required for the combustion of gaseous volatiles is formed therein, so that the combustible volatiles can be fully burned.

As shown in FIG. 1, in a preferred embodiment of the preferred embodiment, a magazine _{6 is} connected below the feeding port 14, and the furnace 2 is formed at the bottom of the tank 6. Thereby, the space in the tank 6 is formed as a solid fuel zone 12, and the bottom of the furnace space outside the tank 6 is closed to form a gas zone 13. In this example, since the solid fuel zone 12 and the gaseous zone are separated by the tank 6, the stratified combustion of the solid fuel and the gaseous volatiles is effectively ensured, and the combustion efficiency is improved. Also, in this embodiment, since the tank 6 is connected below the feed port 14, the height of the solid fuel in the tank 6 increases the pressure of the fuel on the furnace 2, causing the fuel to shrink in volume during combustion. And the weakening of the supporting force and the enthalpy replenishment, so that the ash generated in the combustion process of the fuel is squeezed to the gap of the furnace ₂ to be discharged, so that the solid fuel can be fully burned, avoiding The problem of forced dusting has improved the combustion efficiency.

In the preferred embodiment, as shown in FIGS. 1 and 11, the lower port 52 of the tubular passage 5 is connected to the side wall of the tank 6, so that the solid fuel in the tank 6 is burned. The generated gaseous volatiles and the gas stream fed into the air duct 3 can enter the tubular passage 5, and after the tubular passage 5 is sufficiently mixed, it can enter the gaseous region 13 via the upper port 31, thereby being in the gaseous region 13 The high-temperature combustion zone is formed, so that the gaseous volatiles can be fully burned, the combustion efficiency is improved, and the emission pollution is reduced.

[58] As shown in FIG. 11, in the preferred embodiment, the upper portion of the tank 6 is closed, and the lower portion has a vent hole 61 communicating with the gas region 13, so that the gaseous volatiles generated in the tank 6 are generated. It is able to enter the gaseous region through the vent hole 61 and the tubular passage 5. As a specific example, as shown in FIG. 11, the side edges 22, 23 of the furnace 2 can be folded up and connected to the tank 6, thereby forming a lower portion of the tank 6, the furnace of the folded portion. The gap of 2 is formed as the vent hole 61 described above. Of course, as another alternative example, the vent hole 61 may also be a through-hole (not shown) through the wall opening formed in the lower portion of the magazine 6.

As another embodiment of the preferred embodiment, as shown in FIG. 2, the lower portion of the feed port 14 can be directly connected to the furnace 1 without providing a tank, so that the feed port 11 feeds solids. The fuel can fall directly into the bottom of the furnace 1, and is deposited as a solid fuel zone 12 in the lower portion of the furnace 1, and a gas zone 13 is formed in the upper portion of the furnace 1 above the solid fuel zone 12, so that the gaseous volatiles generated by the solid fuel zone 12 are generated. It can directly reach the gas zone with the ascending airflow, and mix with the air sent by the air supply duct 3 to perform high-temperature combustion, thereby improving combustion efficiency and reducing emission pollution.

[60] In the solid fuel combustion furnace of the present invention, in order to prevent the flue gas from escaping from the feed port 14 to form a flue effect, the feed port 14 can be kept closed without being fed, only after the feed is added. Opening, the solid fuel is introduced into the furnace 1 through the feeding port 14, and the closed structure on the feeding port 14 is used in various forms, for example, directly feeding the feeding cover on the feeding port 14, or feeding The material port 14 is directly connected to the closable feeding mechanism and the like, and will not be described in detail here.

As shown in FIG. 1 and FIG. 2, in a preferred embodiment of the present invention, a blow duct 7 may be further disposed outside the furnace 1 , and an outlet 71 of the air duct 7 is located at the upper exit 11 Thus, the gas burner port 10 is formed at the upper outlet 11 position. During use of the solid combustion furnace, solid fuel is fed into the furnace 1 from the feed port 14, and the primary air enters from the furnace 2 at the lower end of the solid fuel zone 12, so that the solid fuel is burned at a low temperature, and the volatile matter generated by the combustion is burned. Entering the gas zone 13, the secondary air provided by the air supply passage 7 can pass through the secondary air outlet 71 reaches the upper outlet 11 position at the upper end of the gaseous region 13, so that the secondary air is mixed with the combustible gas in the volatile portion and burned at a high temperature, and a high-temperature gaseous combustion port 10 is formed at the upper outlet 11 position. Since the combustible gas generated by the solid fuel is mixed with the secondary air at the upper outlet 11 in the above combustion process, the high-temperature combustion is performed again, thereby further improving the combustion efficiency and reducing the emission of harmful gases.

[02] As shown in FIG. 1 to FIG. 2, in a specific example, a casing 8 may be sleeved outside the furnace 1, and a secondary air inlet passage is formed between the casing 8 and the outer wall of the furnace 1. 7. A damper 81 for air intake is opened at a lower portion of the outer casing 8. Thus, since the inlet passage 7 of the secondary air is formed in the space between the outside of the furnace 1 and the outer casing 8, the secondary air entering from the damper 81 can be preheated by the heat radiated from the outer wall of the furnace 1 and supplied to the upper outlet 11 The position, mixed with the combustible gas, effectively utilizes the heat lost by the furnace 1 and improves the utilization of heat generated by the combustion of the fuel.

In the present invention, as shown in Figs. 3-8, the furnace 2 includes a plurality of grate bars 20 which can be folded into a general shape as shown in Figs. As shown in FIG. 6-8, in a preferred embodiment, the grate 20 can be formed into a high and low undulation shape, thereby further increasing the surface area of the grate 2 and increasing the contact area of the solid fuel with the air on the grate 2. And the shape of the high and low undulations also facilitates the movement of the solid fuel during the combustion process to form a downward cleaning mechanical force, thereby facilitating the falling of the ash.

As a preferred embodiment, as shown in FIG. 7, the undulation shape of the grate on the grate 2 may be set such that the position adjacent to the height 201 of the grate 20 is low 202. And the position adjacent to the lower portion 202 of the grate 20 is formed as a high place 201, thereby facilitating a reasonable distribution of the solid fuel on the grate 2, and in the combustion process of the fuel, the ash can be along the grate 20 The lower part automatically falls, forming an automatic ash.

[65] In a specific embodiment, as shown in FIG. 7, the grate 20 may be formed in a wave shape; as shown in FIG. 6, the grate 20 may be zigzag; as shown in FIG. The grate 20 may be in the shape of a spiral undulation. The grate 20 can also be used in a variety of other forms as long as it has a high and low undulating shape and will not be described in detail herein.

The above is a description of several specific embodiments of the invention, which are intended to illustrate the invention and not to limit the scope of the invention.

Claims

Claim

A solid fuel burning furnace comprising:

a furnace having a furnace mouth;

a furnace, which is disposed below the furnace and has a raised ridge;

a supply duct disposed below the ridge of the furnace and having an air inlet and an upper air outlet, wherein the upper air outlet faces the ridge.

The solid fuel combustion furnace according to claim 1, wherein a ridge portion of the furnace is inclined in a height direction, and the air supply duct is also inclined with the ridge portion.

The solid fuel combustion furnace according to claim 2, wherein the upper air outlet of the air supply duct faces the upper portion of the ridge, and the lower air outlet of the lower portion of the ridge is provided on the side wall of the air supply duct. .

A solid fuel combustion furnace according to claim 1, wherein a flap is provided above said upper air outlet.

The solid fuel combustion furnace according to claim 3, wherein the lower air outlet of the air supply duct is provided with a flap.

A solid fuel combustion furnace according to claim 1, wherein said combustion furnace further comprises a fan that forcibly blows air into the air supply duct.

A solid fuel combustion furnace according to claim 1, wherein said air supply duct is a tapered tube.

A solid fuel combustion furnace according to claim 1, wherein said furnace has a cross section of a triangular shape opened at a lower end, or an arched shape, or a truncated cone shape having an open lower end.

A solid fuel combustion furnace according to claim 1, wherein a tubular passage is provided above said ridge in said furnace, said tubular passage having an upper port and a lower port, wherein said tubular port has a lower port Toward the ridge of the furnace, the upper port of the tubular passage faces the mouth of the furnace.

A solid fuel combustion furnace according to claim 1 or 9, wherein a solid fuel zone and a gas zone communicating with the solid fuel zone are formed in the furnace, and the furnace is connected to the solid fuel zone. a lower end, the furnace opening is located at an upper portion of the gas region, on the furnace The part has a feeding port.

[11] The solid fuel combustion furnace according to claim 10, wherein the tubular passage extends upward from the lower port toward the gaseous region, and the upper port thereof is located in the gaseous region.

[12] The solid fuel combustion furnace according to claim 10, wherein the feed port is directly connected to the furnace so that the solid fuel fed from the feed port directly falls to the bottom of the furnace, in the lower portion of the furnace It is deposited as a solid fuel zone, and a gas-filled zone is formed in the upper portion of the furnace above the solid fuel zone.

[13] The solid fuel combustion furnace according to claim 10, wherein a tank is connected below the feed port, and the furnace is formed at a bottom of the tank, so that the space in the tank Formed as a solid fuel zone, the bottom of the furnace space outside the bin is closed to form a gaseous zone.

[14] The solid fuel combustion furnace according to claim 13, wherein the lower port of the tubular passage is connected to a side wall of the tank.

[15] The solid fuel combustion furnace according to claim 13, wherein the upper portion of the tank is closed, and the lower portion has a vent hole communicating with the gas region.

[16] The solid fuel combustion furnace according to claim 15, wherein the sides of the furnace are folded upward and then connected to the tank, thereby forming a lower portion of the tank, and the gap of the furnace is formed. For the vents described.

[17] The solid fuel combustion furnace according to claim 10, wherein a blower passage is provided outside the furnace, and an outlet of the blower passage is located at an upper outlet position, thereby forming a gaseous combustion at the upper outlet position. mouth.

[18] The solid fuel combustion furnace according to claim 17, wherein a casing is provided in the furnace casing, and the inlet passage is formed between the casing and the outer wall of the furnace, and the lower portion of the casing is provided. The wind door of the wind.

[19] The solid fuel combustion furnace according to claim 1, wherein the furnace comprises a plurality of grate bars, wherein each grate has a shape of high and low undulations.

[20] The solid fuel combustion furnace according to claim 19, wherein the height of the furnace strip of the furnace is arranged such that the position adjacent to the height of the grate is low, and versus The adjacent positions of the lower portion of the grate are formed to be high.

A solid fuel combustion furnace according to claim 19 or 20, wherein said grate is formed in a wave shape, a zigzag shape or a spiral shape.