Biomass pyrolysis gasification furnace

Abstract

The utility model discloses a biomass pyrolysis gasifier and belongs to gas fuel preparation equipment. A spiral auger type feeding shaft is rotatably and vertically mounted at the center of the upper end of a furnace shell assembly, a motor is fixedly mounted outside the top end of the furnace shell assembly, and the motor is connected with the upper end of the spiral auger type feeding shaft. A conical spiral involute-shaped elastic material supplementing disc is fixedly installed at the position, located above the fire grate assembly, of the lower end of the spiral auger type feeding shaft. Odd-numbered or even-numbered fire bars of the fire grate assembly are connected with a driving mechanism composed of a stepping motor, a driving wheel, a crank, a driving rod and a connecting rod. The electromagnetic heating coil is sleeved on the outer wall surface of the combustible gas metal output pipeline; the whole air supply pipe is in a spiral involute coil pipe shape. The furnace is novel, unique, simple and reasonable in structure, high in gas production efficiency, good in use safety and rapid and smooth in waste discharge.

Description

Technical Field

[0001] The utility model belongs to gas fuel preparation equipment, and mainly relates to a pyrolysis gasification furnace which uses biomass raw materials such as straw to prepare combustible gas. Background Art

[0002] With the reduction of non-renewable energy such as coal and oil, the search and research and development of various new energy sources have become urgently needed and have been put on the scientific and technological work agenda. In recent years, a method for preparing high-concentration, clean and pollution-free gas fuel containing hydrocarbons and tar by low-temperature pyrolysis and anoxic combustion using biomass crop straw, which is a traditional waste of agricultural production, as raw materials has been successfully studied, which not only provides a new way for the comprehensive utilization of crop straw, but also provides a new type of fuel for human production and life. However, due to the shortcomings and defects in the structural design of pyrolysis and gasification equipment, the existing biomass crop straw is prone to uneven burning between the lightly thrown straw raw materials due to fluffiness, overhead and voids during low-temperature pyrolysis and anoxic combustion inside the furnace body, that is, uneven combustion, the integral grate is not conducive to uniform regulation of oxygen supply and waste discharge, tar deposition and blockage on the inner wall of the metal output pipe of the combustible gas, affecting the discharge and collection of the combustible gas from the straw gasification, and prone to fire. These problems need to be overcome and solved. Summary of the invention

[0003] The purpose of the utility model is to address the problems existing in the above-mentioned prior art, combine with the current actual needs for biomass fuel production operations, and research and design a biomass pyrolysis gasification furnace with a new structure, so as to achieve the purpose of low-temperature pyrolysis and oxygen-deficient combustion of biomass raw materials in the furnace body, which is uniform and sufficient, without biased burning, improves gas production efficiency, avoids and eliminates fires, and facilitates the discharge of waste after combustion.

[0004] The basic design of the utility model is that the biomass pyrolysis gasification furnace comprises a furnace shell assembly, a feeding conveyor and a combustible gas metal output pipe which are connected to each other are respectively equipped on the upper end of the furnace shell assembly, a grate assembly and an air supply pipe with air outlets are sequentially equipped from top to bottom in the furnace chamber of the furnace shell assembly, a blower assembly arranged on the outer side of the furnace shell assembly is connected to the air inlet end of the air supply pipe, a spiral auger feeding shaft is rotatably installed vertically at the center of the upper end of the furnace shell assembly, a motor is fixed on the outside of the top end of the furnace shell assembly, the motor is connected to the upper end of the spiral auger feeding shaft, and a conical spiral involute elastic feeding disk is fixed on the lower end of the spiral auger feeding shaft, which is located above the grate assembly.

[0005] The utility model has a novel, unique, simple and reasonable structure, has sufficient low-temperature pyrolysis combustion, high gas production efficiency, good safety in use, and quick and convenient waste discharge, thus providing technical support for the preparation and production of biomass gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of the overall structure of a biomass pyrolysis gasification furnace;

[0007] Figure 2 yes Figure 1 The partial cross-sectional view along the A-A axis is a schematic diagram of the structure of the conical spiral involute feeding tray;

[0008] Figure 3 It is a schematic diagram of the grate structure;

[0009] Figure 4 yes Figure 3 A top view of

[0010] Figure 5 yes Figure 1 The partial cross-sectional view along the B-B axis is a schematic diagram of the duct structure.

[0011] Description of part numbers in the figure:

[0012] 1. Furnace shell assembly, 2. Electromagnetic heating coil, 3. Combustible gas metal output pipe, 4. Spiral auger feeding shaft, 5. Motor, 6. Feeding conveyor, 7. Blower assembly, 8. Grate assembly, 8-1, grate bar, 9. Air supply pipe, 10. Connecting rod, 11. Driving rod, 12. Driving wheel, 13. Stepping motor, 14. Crank, 15. Conical spiral involute feeding tray. DETAILED DESCRIPTION

[0013] The following is a detailed description of the implementation scheme of the utility model in conjunction with the accompanying drawings. A biomass pyrolysis gasification furnace includes a furnace shell assembly 1, a feed conveyor 6 and a combustible gas metal output pipe 3 are respectively connected to each other on the upper end of the furnace shell assembly 1, a grate assembly 8 and an air supply pipe 9 with air outlets are sequentially installed from top to bottom in the furnace of the furnace shell assembly 1, a blower assembly 7 arranged on the outer side of the furnace shell assembly 1 is connected to the air inlet end of the air supply pipe 9, a spiral auger-type feeding shaft 4 is rotatably installed vertically at the center of the upper end of the furnace shell assembly 1, a motor 5 is fixed on the outside of the top of the furnace shell assembly 1, and the motor 5 is connected to the upper end of the spiral auger-type feeding shaft 4, and a conical spiral involute elastic feeding disk 15 is fixed on the lower end of the spiral auger-type feeding shaft 4, located above the grate assembly 8. The grate assembly 8 is composed of a plurality of grate bars 8-1 arranged in parallel with each other. Connecting rods 10 are fixedly mounted in parallel with each other on the ends of the grate bars 8-1 at odd or even positions on the same side of the grate assembly 8. A driving rod 11 is hingedly supported and mounted in parallel with the grate assembly 8 on the upper end of the connecting rod 10. A driving wheel 12 is fixedly mounted on a stepping motor 13 arranged outside the furnace shell assembly 1. A crank 14 is hingedly mounted on the eccentric part of the driving wheel 12. The crank 14 is hingedly connected to the driving rod 11. An electromagnetic heating coil 2 is sleeved and mounted on the outer wall of the combustible gas metal output pipe 3. The air supply pipe 9 is in the shape of a spiral involute coil as a whole.

[0014] When preparing biomass gas for use, the biomass raw materials are fed from the feed conveyor 6 into the upper silo of the furnace shell assembly 1, and driven by the motor 5 to rotate the spiral auger feeding shaft 4, which is transported downward and falls on the grate assembly 8, ignited, and burned in a low-temperature, oxygen-deficient environment. The high-concentration combustible gas containing hydrocarbons and tar produced by the combustion is output through the combustible gas metal output pipe 3 for centralized collection. During the operation, the spiral auger feeding shaft 4 drives the rotating conical spiral involute elastic feeding plate 15 to continuously evenly flatten and appropriately squeeze the biomass material on the grate assembly 8 to avoid overhead and voids, eliminate the phenomenon of uneven combustion, and make the straw burn fully and evenly, thereby ensuring and improving the quality and efficiency of combustion and gas production under low-temperature, oxygen-deficient conditions; the rotating stepper motor 13 drives the rotation of some of the grate bars 8-1 arranged at intervals on the grate assembly 8 through the driving wheel 12, crank 14, driving rod 11, and connecting rod 10, and adjusts and changing the gap between the adjacent fixed grate bars 8-1, which not only facilitates the discharge of materials, but also disturbs the materials on the grate assembly 8, adjusts the oxygen supply effect and improves the combustion quality; the air supply pipe 9 located below the grate assembly 8 and in the shape of a spiral involute coil as a whole makes the supplied oxygen more evenly distributed in the area below the grate assembly 8; the electromagnetic heating coil 2 that is powered on for heating can melt and eliminate the tar deposited on the inner wall of the metal output pipe 3 for combustible gas, avoid tar deposition, eliminate fire hazards, and improve the efficiency of conveying combustible gas.

Claims

1. A biomass pyrolysis gasification furnace, comprising a furnace shell assembly (1), a feeding conveyor (6) and a combustible gas metal output pipe (3) which are connected to each other and are respectively installed on the upper end of the furnace shell assembly (1), a grate assembly (8) and an air supply pipe (9) with air outlet holes are installed in the furnace of the furnace shell assembly (1) from top to bottom, and a blower assembly (7) arranged on the outer side of the furnace shell assembly (1) is connected to the air inlet end of the air supply pipe (9), characterized in that: A spiral auger-type feeding shaft (4) is rotatably mounted vertically at the center of the upper end of the furnace shell assembly (1); a motor (5) is fixedly mounted on the outer top of the furnace shell assembly (1); the motor (5) is connected to the upper end of the spiral auger-type feeding shaft (4); and a conical spiral involute elastic feeding disc (15) is fixedly mounted on the lower end of the spiral auger-type feeding shaft (4) at a position above the grate assembly (8).

2. The biomass pyrolysis gasification furnace according to claim 1, characterized in that: The grate assembly (8) is composed of a plurality of grate bars (8-1) arranged in parallel with each other. Connecting rods (10) are fixedly mounted in parallel with each other on the ends of the grate bars (8-1) at odd or even positions on the grate assembly (8) on the same side. A driving rod (11) is hingedly mounted on the upper end of the connecting rod (10) and supported in parallel with the grate assembly (8). A driving wheel (12) is fixedly mounted on a stepping motor (13) arranged outside the furnace shell assembly (1). A crank (14) is hingedly mounted on an eccentric portion of the driving wheel (12). The crank (14) is hingedly connected to the driving rod (11).

3. The biomass pyrolysis gasification furnace according to claim 1, characterized in that: An electromagnetic heating coil (2) is sleeved and installed on the outer wall surface of the combustible gas metal output pipe (3).

4. The biomass pyrolysis gasification furnace according to claim 1, characterized in that: The air supply pipe (9) is in the shape of a spiral involute coil as a whole.

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