Combustion-supporting mechanism of biomass hot blast stove

Abstract

The utility model discloses a biomass hot blast stove combustion-supporting mechanism which comprises a stove body, a cylindrical hearth is arranged in the stove body, a hot air pipe communicated with the hearth is arranged at the top of the stove body, an ash discharging device is arranged at the bottom of the stove body, a latticed supporting plate is arranged at the corresponding bottom of the hearth, a combustion-supporting coil pipe is installed below the supporting plate, and the combustion-supporting coil pipe is divided into an air pipe and a gas pipe. And air holes are formed in the bottoms of the air pipe and the gas pipe. The air pipe and the gas pipe are both of a circular structure and are staggered inside and outside, so that gas can be in full contact with air after being sprayed out, the air not only meets the incineration supply of the gas, but also provides enough air supply for biomass incineration, and air holes corresponding to the gas pipe and the air pipe are both located at the bottom. And ash after combustion can be prevented from entering the air holes to block the pipeline.

Description

Technical Field

[0001] The utility model belongs to the technical field of hot blast stove equipment, in particular to a combustion-supporting mechanism of a biomass hot blast stove. Background Art

[0002] Biomass hot air furnace is a new type of hot air furnace that uses biomass fuel as fuel. Common biomass fuels include straw, sawdust, bagasse, rice bran and other organic matter formed through photosynthesis. Generally, biomass hot air furnaces do not directly use straw as fuel. Biomass fuel is actually processed products of straw, etc., and its physical form is granular.

[0003] As biomass, straw appears in the form of particles, and the distance between biomass materials is very small. The conditions for biomass combustion are preheating, ignition and sufficient oxygen, but dense materials cannot be fully in contact with the air, nor can they be fully preheated. In addition, many materials are placed for a long time before combustion, and there is a certain degree of moisture, which leads to insufficient combustion or low combustion efficiency in the hot air furnace, and the heat energy demand cannot be met. The combustion of biomass materials can be accelerated by combustion-supporting methods. Existing combustion-supporting methods all use cheap natural gas as auxiliary fuel, but natural gas cannot be injected alone. Sufficient air needs to be injected as oxygen supply for combustion. At the same time, natural gas and air cannot be premixed, which is prone to explosion.

[0004] The utility model mainly improves the bottom structure and adds a flame retardant mechanism according to the structural characteristics of the existing hot blast stove, and improves the combustion efficiency of the biomass material by using natural gas for combustion assistance. Utility Model Content

[0005] The utility model aims to provide a combustion-supporting mechanism for a biomass hot blast stove. According to the structural characteristics of the existing hot blast stove, the bottom structure is improved, a flame retardant mechanism is added, and combustion is supported by natural gas to improve the incineration efficiency of biomass materials.

[0006] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0007] A biomass hot blast furnace combustion-supporting mechanism comprises a furnace body, wherein the furnace body has a cylindrical furnace chamber inside, the top and bottom of the furnace chamber are both conical structures, the top of the furnace body has a hot blast pipe connected to the furnace chamber, and the bottom of the furnace body has an ash discharge device;

[0008] The corresponding bottom of the furnace has a grid-shaped support plate, and a combustion-supporting coil is installed under the support plate. The combustion-supporting coil is divided into an air pipe and a gas pipe. The air pipe and the gas pipe are both circular, and the air pipe and the gas pipe are concentric and arranged inside and outside in a staggered manner. The air pipe and the gas pipe have air holes at the bottom.

[0009] Furthermore, the air pipe and the gas pipe are both connected to the same pipe body, the pipe openings at both ends of the pipe body are sealed and extend to the outside of the furnace body, a partition is provided at the axial position of the pipe body, the partition is provided horizontally, the end of the pipe body corresponding to the part above the partition is connected to the gas pipe, and the end of the pipe body corresponding to the part below the partition is connected to the air pipe. The air pipe and the gas pipe are both annular structures, and the corresponding pipe openings at both ends of the air pipe and the gas pipe are connected to the pipe body.

[0010] Furthermore, the support plate is formed by staggered arrangement of transverse and longitudinal ribs to form a grid structure, and a double-layer conical frame is supported on the upper side of the support plate, and the conical frame has hollow holes, is arranged up and down, and is supported on the support plate through a central support rod. A hopper is installed on the side wall of the furnace body, and the hopper adds biomass fuel into the furnace through a screw feeder, and a guide plate is arranged in the furnace to guide the biomass fuel to the top conical frame.

[0011] The ash discharge device comprises a spiral pusher located at the bottom of the furnace body, which is used to discharge the ash from the bottom of the furnace in time and reserve sufficient incineration space.

[0012] The utility model has the following beneficial effects: gas is used as auxiliary fuel, and an air pipe is added at the same time to inject air required for combustion, the air pipe and the gas pipe are separately arranged to prevent the risk of gas mixing with air in advance and exploding at high temperature, the air pipe and the gas pipe are both circular structures, staggered inside and outside, so that the gas can get sufficient air contact after being sprayed out, the amount of air entering is 6 times more than that of the gas, the air not only meets the combustion supply of the gas, but also provides sufficient air supply for biomass combustion, the air is heated after entering the furnace, and then discharged through the heat distribution pipe.

[0013] The corresponding air holes of the gas pipe and the air pipe are both located at the bottom, which can prevent the ashes after burning from entering the air holes and causing the pipes to be blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for describing the embodiments are briefly introduced below.

[0015] Figure 1 : Schematic diagram of the structure of the utility model.

[0016] Figure 2 : Schematic diagram of the upper structure of the combustion-supporting coil of the utility model.

[0017] Figure 3 : Schematic diagram of the lower structure of the combustion-supporting coil of the utility model.

[0018] In the accompanying drawings, the list of components represented by each reference numeral is as follows: furnace body 1, furnace chamber 11, hot air pipe 12, support plate 3, air pipe 22, gas pipe 23, air hole 24, tube body 2, partition 21, conical frame 31, feeding hopper 4, guide plate 41. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0020] like Figure 1 As shown: A biomass hot air furnace combustion-supporting mechanism includes a furnace body 1, which is made of bricks. The furnace body 1 has a cylindrical furnace 11 inside. The top and bottom of the furnace 11 are both conical structures. The top of the furnace body has a hot air pipe 12 connected to the furnace 11, and the conical top is connected to the hot air pipe orifice. The bottom of the furnace body 1 has an ash discharge device; it is used to discharge the ash after biomass incineration in time to ensure sufficient space at the bottom of the furnace.

[0021] The furnace 11 has a grid-shaped support plate 3 at the corresponding bottom, which is used to support biomass incineration materials and at the same time allow the ashes after biomass incineration to pass through. A combustion-supporting coil is installed under the support plate 3. The combustion-supporting coil is divided into an air pipe 22 and a gas pipe 23. Both the air pipe 22 and the gas pipe 23 are circular. There are multiple air pipes and gas pipes, which are interconnected. The air pipe 22 and the gas pipe 23 are concentric and arranged in an inner and outer staggered manner. Air holes 24 are opened at the bottom of the air pipe 22 and the gas pipe 23.

[0022] The utility model adopts gas as auxiliary fuel, and adds an air pipe at the same time to inject air required for combustion. The air pipe and the gas pipe are separately arranged to prevent the risk of gas mixing with air in advance and exploding at high temperature. The air pipe and the gas pipe are both circular structures, staggered inside and outside, so that the gas can get sufficient air contact after being sprayed out. The amount of air entering is 6 times more than that of the gas. The air not only meets the combustion supply of the gas, but also provides sufficient air supply for biomass combustion. The air is heated after entering the furnace and then discharged through the heat distribution pipe.

[0023] The corresponding air holes of the gas pipe and the air pipe are both located at the bottom, which can prevent the ashes after burning from entering the air holes and causing the pipes to be blocked.

[0024] like Figure 2-3As shown: the air pipe 22 and the gas pipe 23 are both connected to the same pipe body 2, the pipe openings at both ends of the pipe body 2 are sealed and both extend to the outside of the furnace body, a partition 21 is arranged at the axial position of the pipe body 2, the partition 21 is arranged horizontally, the end of the pipe body 2 corresponds to the part above the partition 21 and is connected to the gas pipe 23, and the end of the pipe body 2 corresponds to the part below the partition 21 and is connected to the air pipe 22. The partition divides the pipe body into an upper part and a lower part, which are used to connect the gas pipe and the air pipe respectively, and share the same pipe body, reducing the volume occupied by the pipe body in the furnace, which is convenient for management and maintenance. The gas pipe and the air pipe are not only staggered in the horizontal direction, but also in the longitudinal direction, which helps the ash to pass through. The air pipe 22 and the gas pipe 23 are both annular structures, and the corresponding pipe openings at both ends of the air pipe 22 and the gas pipe 23 are connected to the pipe body 2. In this way, the air pipe and the gas pipe are evenly distributed on both sides of the pipe body, the supporting structure is stable, the pipe body extends to the part outside the furnace body, the upper part of the pipe body is connected to the gas supply pipeline, and the lower part of the pipe body is connected to the air compressor.

[0025] like Figure 1 As shown: the support plate 3 is formed by staggered arrangement of transverse and longitudinal plate ribs to form a grid structure, and the upper side of the support plate 3 supports a double-layered conical frame 31, which has hollow holes and is arranged up and down, and is supported on the support plate 3 through a central support rod. After the biomass combustion material is put in, it is directly spread evenly to the circumference through the two-layered conical frame, so that the granular material is fully exposed to air and heat, thereby improving the combustion rate.

[0026] A hopper 4 is installed on the side wall of the furnace body 1. The hopper 4 adds biomass fuel into the furnace 11 through a screw feeder. A guide plate 41 is provided in the furnace 11 to guide the biomass fuel to the top conical frame 31. The ash discharge device includes a screw pusher at the bottom of the furnace body, which is used to discharge the ash from the bottom of the furnace in time and reserve sufficient incineration space.

[0027] This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can better understand and utilize the present invention.

Claims

1. A biomass hot air stove combustion-supporting mechanism, characterized in that: The furnace body (1) comprises a cylindrical furnace (11) inside, the top and bottom of the furnace (11) are both conical structures, the top of the furnace body (1) is provided with a hot air pipe (12) connected to the furnace (11), and the bottom of the furnace body (1) is provided with an ash discharge device; The furnace (11) has a grid-shaped support plate (3) at the bottom thereof, a combustion-supporting coil is installed below the support plate (3), the combustion-supporting coil is divided into an air pipe (22) and a gas pipe (23), the air pipe (22) and the gas pipe (23) are both circular, the air pipe (22) and the gas pipe (23) are cocentric and arranged in an inner and outer staggered manner, and air holes (24) are opened at the bottom of the air pipe (22) and the gas pipe (23).

2. According to claim 1, a biomass hot air stove combustion-supporting mechanism is characterized in that: The air pipe (22) and the gas pipe (23) are both connected to the same pipe body (2); the pipe openings at both ends of the pipe body (2) are sealed and both extend to the outside of the furnace body; a partition (21) is provided at the axial position of the pipe body (2); the partition (21) is arranged horizontally; the end of the pipe body (2) corresponding to the part above the partition (21) is connected to the gas pipe (23); the end of the pipe body (2) corresponding to the part below the partition (21) is connected to the air pipe (22).

3. According to claim 2, a biomass hot air stove combustion-supporting mechanism is characterized in that: The air pipe (22) and the gas pipe (23) are both annular structures, and the corresponding two end pipe openings of the air pipe (22) and the gas pipe (23) are both connected to the pipe body (2).

4. The combustion-supporting mechanism of a biomass hot air stove according to claim 1, characterized in that: The support plate (3) is formed by staggered arrangement of transverse and longitudinal plate ribs to form a grid structure. The upper side of the support plate (3) supports a double-layer conical frame (31). The conical frame (31) has hollow holes and is arranged up and down, and is supported on the support plate (3) through a central support rod.

5. The combustion-supporting mechanism of a biomass hot air stove according to claim 4, characterized in that: A hopper (4) is installed on the side wall of the furnace body (1), and the hopper (4) adds biomass fuel into the furnace (11) through a screw feeder. A guide plate (41) is provided in the furnace (11) to guide the biomass fuel to the top conical frame (31).

6. The combustion-supporting mechanism of a biomass hot air stove according to claim 1, characterized in that: The ash discharge device comprises a spiral pusher located at the bottom of the furnace body, which is used to discharge the ash from the bottom of the furnace in time and reserve sufficient incineration space.

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