Hearth structure of downdraft biomass gasifier

Abstract

The utility model discloses a hearth structure of a downdraft biomass gasification furnace, and particularly relates to the downdraft biomass gasification furnace which comprises a body, the interior of the body comprises a pyrolysis area, the inner wall of the body is provided with an inner diameter cylinder arranged corresponding to the pyrolysis area, and a clamping cavity is formed between the inner diameter cylinder and the pyrolysis area; a plurality of partition plates arranged at intervals are arranged in the clamping cavity, equidistant springs are symmetrically arranged between every two partition plates, and a metal cooling pipe is welded between every two equidistant springs. A fin plate is arranged on the inner wall of the body, and a plurality of vertical plates arranged in a spiral linear array mode are arranged on one side of the fin plate and face the partition plate. The device is simple in structure, convenient and fast to operate and capable of keeping the temperature of the pyrolysis area, so that the tar yield is guaranteed.

Description

Technical Field

[0001] The utility model relates to a downdraft biomass gasifier, in particular to a furnace structure of the downdraft biomass gasifier. Background Art

[0002] A downdraft biomass gasifier is a device that uses biomass fuel for gasification. The specific structure of the downdraft biomass gasifier can be referred to the publication (announcement) number: CN103232859B, the publication (announcement) date: 2014-08-27, and the multi-stage downdraft biomass gasifier disclosed relates to a biomass gasification device. A multi-stage downdraft biomass gasifier is provided that can improve biomass conversion efficiency and improve biomass fuel gas quality. A biomass raw material storage trough, an upper furnace body, a middle furnace body and a lower furnace body are provided; the upper furnace body, the middle furnace body and the lower furnace body are connected to each other coaxially, the biomass raw material storage trough is arranged at the upper part of the upper furnace body, the biomass raw material storage trough is provided with a feeding port, a feeding port cover and a discharging port, and the discharging port is communicated with the inner cavity of the upper furnace body; a guide cylinder is provided in the inner cavity of the upper furnace body, a plurality of holes are opened on the side wall of the guide cylinder, a gap is provided between the guide cylinder and the inner cavity wall of the upper furnace body, and the guide cylinder is located below the biomass raw material storage trough; a first-stage air inlet and a liquefied gas inlet are provided at the upper part of the upper furnace body; at least 4 second-stage air inlets are provided at the upper part of the middle furnace body, and a furnace bar is provided at the lower part of the middle furnace body; a ash cleaning port and a gas outlet are provided at the lower furnace body.

[0003] In the prior art including the above patents, the influence of temperature on tar is mainly manifested in two aspects: one is the cracking of coal to generate tar, and the other is the cracking of tar. Among them, when coal cracking is dominant, the tar yield gradually increases with the increase of temperature; when tar cracking is dominant, the tar yield continues to decrease with the increase of temperature. Therefore, controlling the temperature is of great significance to achieve low-tar gasification. Utility Model Content

[0004] The utility model aims to provide a furnace structure of a downdraft biomass gasifier to solve the above problems.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A furnace structure of a downdraft biomass gasifier comprises a body, wherein the interior of the body comprises a pyrolysis zone, an inner diameter cylinder arranged corresponding to the pyrolysis zone is arranged on the inner wall of the body, and a sandwich cavity is formed between the two;

[0007] A plurality of spaced partitions are arranged in the clamping cavity, and an equidistant spring is symmetrically arranged between every two of the partitions, and a metal cooling tube is welded between the two equidistant springs;

[0008] The inner wall of the inner wall of the body is provided with a fin plate, and a plurality of vertical plates arranged in a spiral array are provided on one side of the fin plate and arranged toward the partition plate.

[0009] Preferably, the cross-section of the inner diameter cylinder is an isosceles trapezoidal structure, and the two waists are arranged vertically.

[0010] Preferably, a silicone grease layer is provided inside the inner diameter cylinder.

[0011] Preferably, a V-shaped plate is provided at one end of the partition, and the vertical plate corresponds to the inner top angle of the V-shaped plate;

[0012] And the ends of the V-shaped plates on every two of the partitions maintain a predetermined distance.

[0013] Preferably, a plurality of equidistantly arranged heat dissipation fin racks are provided in the metal cooling tube, and at least four heating oil conveying steel pipes arranged in a circular array are provided on the heat dissipation fin racks.

[0014] In the above technical solution, the furnace structure of a downdraft biomass gasifier provided by the utility model has the following beneficial effects: the metal cooling pipe is supported between every two partitions by symmetrically arranged equidistant springs, so that the partitions absorb heat evenly, and then transfer it to the pyrolysis zone through the inner diameter tube, and the heat is also accumulated in the clamping cavity. Therefore, the temperature in the coal cracking is maintained, thereby ensuring the tar yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0016] Figure 1 An overall schematic diagram provided for an embodiment of the utility model;

[0017] Figure 2 A schematic diagram of an enlarged structure is provided for an embodiment of the utility model.

[0018] Description of reference numerals:

[0019] 1. Main body; 11. Feeding port; 12. Gasifying agent input end; 13. Gas output end; 14. Waste residue discharge end; 2. Inner diameter cylinder; 3. Clamping cavity; 4. Partition; 41. Equidistant spring; 42. V-shaped plate; 5. Metal cooling pipe; 51. Heat dissipation fin rack; 52. Heating oil delivery steel pipe; 60. Fin plate; 61. Vertical plate; 7. Silicone grease layer. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0021] like Figure 1-2 As shown, a furnace structure of a downdraft biomass gasifier includes a body 1, the interior of the body 1 includes a pyrolysis zone, the inner wall of the body 1 is provided with an inner diameter cylinder 2 arranged corresponding to the pyrolysis zone, and a sandwich cavity 3 is formed between the two;

[0022] A plurality of spaced partitions 4 are arranged in the clamping cavity 3, and an equidistant spring 41 is symmetrically arranged between every two partitions 4, and a metal cooling tube 5 is welded between the two equidistant springs 41;

[0023] The inner wall of the body 1 is provided with a fin plate 60 , and one side of the fin plate 60 is provided with a plurality of vertical plates 61 arranged in a spiral array and arranged toward the partition plate 4 .

[0024] Specifically, the coal gas and the fuel in the embodiment are in a parallel flow state, the fuel is added from the feed port 11 set at the top of the main body 1, and the gasifying agent is fed in from the gasifying agent input end 12 at the upper part of the main body 1, the generated coal gas moves from top to bottom, and the coal gas moving downward all passes through the high temperature zone, and then the coal gas is discharged through the coal gas output end 13 for collection, and the waste residue is discharged from the waste residue discharge end 14 at the bottom of the main body 1.

[0025] According to the functions of the body 1, it is divided into a drying zone, a pyrolysis zone, an oxidation zone, and a reduction zone, wherein the gasification agent input end 12 is located in the drying zone, and the waste residue discharge end 14 and the coal gas output end 13 are located in the reduction zone. This is the prior art and will not be described in detail.

[0026] In the above technology, the metal cold pipe 5 is supported by symmetrically arranged equidistant springs 41 and is located between every two partitions 4, so that the partitions 4 evenly absorb heat and transfer it to the pyrolysis zone through the inner diameter cylinder 2, and the heat is also accumulated in the clamping cavity 3. Therefore, the temperature in the coal cracking is maintained, thereby ensuring the tar yield.

[0027] As an embodiment further provided by the present invention, the cross section of the inner diameter tube 2 is an isosceles trapezoidal structure, and the two waists are arranged vertically.

[0028] Specifically, the inner diameter of the inner diameter tube 2 in the embodiment is smaller than the inner wall of the body 1, and is assembled and fixed on the inner wall of the body 1 by bolts.

[0029] Furthermore, the inner diameter tube 2 in the embodiment is formed by bending a whole steel plate into a steel plate member with an interlayer, and a silicone grease layer 7 is provided in the interlayer, and the edges are polished by arc welding to eliminate gaps.

[0030] As another embodiment further provided by the present utility model, a V-shaped plate 42 is provided at one end of the partition 4, and the vertical plate 61 corresponds to the inner top corner of the V-shaped plate 42;

[0031] The ends of the V-shaped plate members 42 on every two partitions 4 maintain a predetermined distance.

[0032] Specifically, the V-shaped plate 42 in the embodiment can block the temperature of the metal cold pipe 5 between every two partitions 4, so as to form a high-temperature accumulation area near the partition 4. Because the partition 4 and the V-shaped plate 42 are both good thermal conductor materials, which are not disclosed in detail, the heat will also diffuse, so that the vertical plate 61 is heated, so that the clamping cavity 3 is in a high-temperature environment.

[0033] As another embodiment further provided by the utility model, a plurality of equidistantly arranged heat dissipation fin racks 51 are arranged in the metal cooling tube 5 , and at least four heating oil conveying steel pipes 52 arranged in a circumferential array are arranged on the heat dissipation fin rack 51 .

[0034] Specifically, the heated oil in the heating oil delivery steel pipe 52 in the embodiment flows continuously in the pipe to be heated, and at the same time, the heat is absorbed by the heat dissipation fin frame 51 and transferred to the metal cold pipe 5.

[0035] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A furnace structure of a downdraft biomass gasifier, comprising a body (1), wherein the interior of the body (1) comprises a pyrolysis zone, characterized in that: The inner wall of the body (1) is provided with an inner diameter cylinder (2) arranged corresponding to the pyrolysis zone, and a cavity (3) is formed between the two; A plurality of spaced-apart partitions (4) are arranged in the clamping cavity (3), and an equidistant spring (41) is symmetrically arranged between every two of the partitions (4), and a metal cooling tube (5) is welded between the two equidistant springs (41); The inner wall of the inner wall of the body (1) is provided with a fin plate (60), and a plurality of vertical plates (61) arranged in a spiral array are provided on one side of the fin plate (60) and are arranged toward the partition plate (4).

2. The furnace structure of a downdraft biomass gasifier according to claim 1, characterized in that: The cross section of the inner diameter cylinder (2) is an isosceles trapezoidal structure, with two waists arranged vertically.

3. The furnace structure of a downdraft biomass gasifier according to claim 1, characterized in that: A silicone grease layer (7) is provided inside the inner diameter cylinder (2).

4. The furnace structure of a downdraft biomass gasifier according to claim 1, characterized in that: A V-shaped plate (42) is provided at one end of the partition (4), and the vertical plate (61) corresponds to the inner top corner of the V-shaped plate (42); Furthermore, the ends of the V-shaped plates (42) on every two of the partitions (4) maintain a predetermined distance.

5. The furnace structure of a downdraft biomass gasifier according to claim 1, characterized in that: A plurality of equidistantly arranged heat dissipation fin racks (51) are arranged in the metal cooling tube (5), and at least four heating oil conveying steel pipes (52) arranged in a circumferential array are arranged on the heat dissipation fin rack (51).

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