CN107741017B - Efficient low-pollution rural garbage pyrolysis method and device - Google Patents

Efficient low-pollution rural garbage pyrolysis method and device Download PDF

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CN107741017B
CN107741017B CN201711147363.8A CN201711147363A CN107741017B CN 107741017 B CN107741017 B CN 107741017B CN 201711147363 A CN201711147363 A CN 201711147363A CN 107741017 B CN107741017 B CN 107741017B
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flue gas
cylinder
garbage
pyrolysis
cavity
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CN107741017A (en
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余昭胜
顾文露
吴婕
马晓茜
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South China University of Technology SCUT
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South China University of Technology SCUT
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/027Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/027Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage
    • F23G5/0273Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage using indirect heating
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/08Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
    • F23G5/14Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/20Incineration of waste; Incinerator constructions; Details, accessories or control therefor having rotating or oscillating drums
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2201/00Pretreatment
    • F23G2201/30Pyrolysing
    • F23G2201/302Treating pyrosolids
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2201/00Pretreatment
    • F23G2201/30Pyrolysing
    • F23G2201/303Burning pyrogases
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00Technologies for the production of fuel of non-fossil origin
    • Y02E50/10Biofuels, e.g. bio-diesel

Abstract

The invention discloses a high-efficiency low-pollution rural garbage pyrolysis method and a device thereof. Comprises an outer cylinder, a middle cylinder and an inner cylinder which are sleeved in sequence from outside to inside; the inner cylinder is used as a first flue gas channel, a cavity formed between the inner cylinder and the middle cylinder is used as a garbage pyrolysis cavity, and a cavity formed between the middle cylinder and the outer cylinder is used as a second flue gas channel; the peripheral wall surface of the inner cylinder is provided with a helical blade for pushing garbage; the peripheral wall surface of the middle cylinder is provided with a spiral flow deflector, so that the flue gas flows in the second flue gas channel according to the spiral flow guide track of the spiral flow deflector. The high-temperature flue gas flows through the two flue gas channels to transfer heat to the garbage pyrolysis cavity and heat the garbage in the garbage pyrolysis cavity; the garbage moves forward in the garbage pyrolysis cavity under the pushing of the helical blade for pyrolysis. The products generated after the garbage pyrolysis in the pyrolysis process can be combusted and reused, and are used for generating high-temperature flue gas to provide heat for a garbage drying device and a garbage pyrolysis device on one hand, and are used for residential life and industrial and agricultural production on the other hand.

Description

Efficient low-pollution rural garbage pyrolysis method and device
Technical Field
The invention relates to garbage treatment, in particular to a high-efficiency low-pollution rural garbage pyrolysis method and a device thereof.
Background
The treatment of the household production garbage of rural residents is always a relatively troublesome problem, and the treatment mode of direct incineration even aggravates the haze condition in the north. The municipal solid waste treatment technology mainly comprises landfill, composting and heat treatment technology. The rural garbage disposal mode is also in the laggard stage of scattered discarding or incineration, and a part of garbage is discarded at the roadside and directly exposed in the air, so that the environment is dirty and bad; part of the garbage is burnt, black smoke rolls, and the atmosphere is polluted.
At present, two common garbage thermal disposal technologies are direct incineration and pyrolysis gasification. The direct burning is solid heterogeneous burning, and has the problems of insufficient burning, uneven temperature distribution and the like, and the efficiency is lower. The pyrolysis of garbage refers to a conversion technology for cracking organic macromolecules in the garbage into micromolecular fuel substances through thermochemical reaction under the condition of no oxidant or limited oxidant. The garbage pyrolysis gasification can convert the municipal domestic garbage into gas, liquid and solid with stable components for utilization, and has high utilization efficiency, wide utilization range and good economical efficiency. From the viewpoint of pollutant emission, the inadequacy of direct incineration brings about secondary pollution, particularly the emission of dioxin, and the pyrolysis gasification process is carried out in an oxygen-poor or oxygen-deficient atmosphere, so that the generation of dioxin is reduced in principle. Meanwhile, most heavy metals are dissolved into ash in the pyrolysis gasification process, so that the discharge amount is reduced. Therefore, the pyrolysis gasification of the garbage reduces the secondary pollution, is more environment-friendly than direct incineration, and makes full use of resources.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a high-efficiency low-pollution rural garbage pyrolysis method and a device thereof.
The invention is realized by the following technical scheme:
a high-efficiency low-pollution rural garbage pyrolysis device comprises an outer cylinder 4, a middle cylinder 2 and an inner cylinder 1; the outer barrel 4, the middle barrel 2 and the inner barrel 1 are sequentially sleeved from outside to inside, the axes of the outer barrel, the middle barrel and the inner barrel are superposed, and the inner barrel 1 can rotate;
the inner part of the inner cylinder 1 is used as a first flue gas channel 11, a cavity formed between the outer wall of the inner cylinder 1 and the inner wall of the middle cylinder 2 is used as a garbage pyrolysis cavity 12, and a cavity formed between the outer wall of the middle cylinder 2 and the inner wall of the outer cylinder 4 is used as a second flue gas channel 13;
the peripheral wall surface 1-1 of the inner cylinder 1 is provided with a helical blade 1-2 for pushing garbage, so that the garbage spirally moves forward in the garbage pyrolysis cavity 12;
the peripheral wall surface of the middle cylinder 2 is provided with spiral flow deflectors 2-3 for flow guiding, so that the flue gas flows in the second flue gas channel 13 according to spiral flow guiding tracks of the spiral flow deflectors 2-3.
Inner fins 1-3 are spirally distributed on the inner peripheral wall surface of the inner cylinder 1, and the inner fins 1-3 are used for contacting high-temperature flue gas flowing in the first flue gas channel 11; outer fins 2-2 are spirally distributed on the outer peripheral wall surface of the middle cylinder 2, and the outer fins 2-2 are used for contacting high-temperature flue gas flowing in the second flue gas channel 13;
high-temperature flue gas flows through the first flue gas channel 11 and the second flue gas channel 13 and heats the pipe walls of the inner cylinder 1 and the middle cylinder 2, and heat is transferred to the garbage pyrolysis cavity 12 and heats garbage in the garbage pyrolysis cavity; the garbage is pyrolyzed in the forward movement in the garbage pyrolysis chamber 12 under the pushing of the helical blades 1-2.
One end of the garbage pyrolysis cavity 12 is communicated with a garbage inlet 2-1 arranged at one end of the middle barrel 2, and the other end of the garbage pyrolysis cavity 12 is communicated with a solid residue outlet 2-4 arranged at the other end of the middle barrel 2;
two ports of the inner cylinder 1 are respectively used as a smoke inlet/outlet of the first smoke channel 11;
the flue gas inlet pipe 3 and the flue gas outlet pipe 5 of the second flue gas channel 13 are respectively arranged on the pipe walls at the two ends of the outer cylinder 4;
a plurality of product outlet pipes 8 are distributed on the pipe wall along the length direction of the outer barrel 4 at intervals; the axis of the product outlet pipe 8 is perpendicular to the horizontal plane, and the axes of the flue gas inlet pipe 3 and the flue gas outlet pipe 5 are parallel to the horizontal plane.
The rotational kinetic energy of the inner cylinder 1 is provided by a transmission mechanism consisting of a motor 7 and a conveyor belt 6.
A high-efficiency low-pollution rural garbage pyrolysis method comprises the following steps:
the inner cylinder 1 is driven by a transmission mechanism to rotate at a preset speed;
introducing high-temperature flue gas discharged by a combustor into a first flue gas channel 11 and a second flue gas channel 13, wherein the high-temperature flue gas flows in the second flue gas channel 13 according to a spiral flow guide track of spiral flow guide sheets 2-3; the high-temperature flue gas heats the pipe walls of the inner cylinder 1 and the middle cylinder 2, and the heat is transferred to the garbage pyrolysis cavity 12;
the crushed and dried garbage enters a garbage pyrolysis cavity 12 through a garbage inlet 2-1, and is heated and moves forwards in the garbage pyrolysis cavity 12 under the pushing of a helical blade 1-2, is isolated from air in the forward moving process, and is gradually pyrolyzed under the action of heat;
products (hydrogen, methane, carbon monoxide, alkane, aromatic hydrocarbon and the like) after pyrolysis are supplied into the combustor through a product outlet pipe 8, and the flue gas after combustion is returned to the first flue gas channel 11 and the second flue gas channel 13 so as to circulate; if the heat required by pyrolysis is insufficient, external auxiliary fuel can be used for supplementing the burner;
and the residual solid residue after the pyrolysis of the garbage is discharged through a solid residue outlet (2-4) and then collected to be used as a building raw material or other materials.
Compared with the prior art, the invention has the following advantages and effects:
the invention mainly comprises an outer cylinder 4, a middle cylinder 2 and an inner cylinder 1; they are sleeved from outside to inside in sequence, and the inner cylinder 1 can rotate; the inner part of the inner cylinder 1 is used as a first flue gas channel 11, a cavity formed between the outer wall of the inner cylinder 1 and the inner wall of the middle cylinder 2 is used as a garbage pyrolysis cavity 12, and a cavity formed between the outer wall of the middle cylinder 2 and the inner wall of the outer cylinder 4 is used as a second flue gas channel 13; the peripheral wall surface 1-1 of the inner cylinder 1 is provided with a helical blade 1-2 for pushing garbage, so that the garbage spirally moves forward in the garbage pyrolysis cavity 12; this kind of structural design is reasonable, ingeniously with rubbish pyrolysis chamber 12 cladding in inside and outside two flue gas passageways that lead to high temperature flue gas, rubbish spiral moves ahead moreover, not only makes rubbish be heated fastly, is heated more evenly moreover, has improved the pyrolysis effect of rubbish greatly.
The first flue gas channel 11 and the second flue gas channel 13 can also be filled with high-temperature flue gas generated by similar boilers, and can also play a role in heating the garbage pyrolysis cavity 12, so that the garbage pyrolysis is realized.
The spiral flow guide pieces 2-3 for flow guide are arranged on the peripheral wall surface of the barrel 2, so that the flue gas flows in the second flue gas channel 13 according to the spiral flow guide tracks of the spiral flow guide pieces 2-3, the structure greatly increases the stroke of the high-temperature flue gas in the second flue gas channel 13, the retention time of the high-temperature flue gas in the second flue gas channel is prolonged, and the heat exchange efficiency is improved.
Inner fins 1-3 are spirally distributed on the inner peripheral wall surface of an inner cylinder 1, and the inner fins 1-3 are used for contacting high-temperature flue gas flowing in a first flue gas channel 11; outer fins 2-2 are spirally distributed on the outer peripheral wall surface of the middle cylinder 2, and the outer fins 2-2 are used for contacting high-temperature flue gas flowing in the second flue gas channel 13; the structure increases the contact chance of the wall surface and the high-temperature flue gas, increases the specific surface area contacted with the flue gas and improves the heat transfer efficiency.
In the pyrolysis process, crushed and dried garbage enters the garbage pyrolysis cavity 12 through the garbage inlet 2-1, and the garbage is heated and moves forwards in the garbage pyrolysis cavity 12 under the pushing of the helical blades 1-2, is isolated from air in the forward moving process, and is gradually pyrolyzed under the action of heat; products after pyrolysis are supplied into the combustor through a product outlet pipe 8, and the combusted flue gas is returned to the first flue gas channel 11 and the second flue gas channel 13 so as to circulate; if the heat required by pyrolysis is insufficient, external auxiliary fuel can be used for supplementing the burner; and discharging the residual solid residue after pyrolysis of the garbage through a solid residue outlet 2-4, and collecting the residual solid residue as a building raw material.
The pyrolysis process of the invention aims at low-cost pyrolysis and clean energy utilization, and changes the original garbage treatment mode; the garbage pyrolysis is carried out under the low-oxygen or oxygen-free condition formed by the surrounding of the flue gas channels of the outer cylinder 4, the middle cylinder 2 and the inner cylinder 1, so that the generation of heavy metal oxides is reduced, and the generation and the emission of toxic organic substances are reduced. Most harmful components in the garbage are fixed in the semicoke, so that the secondary pollution to the environment is reduced;
the products generated after the garbage pyrolysis in the pyrolysis process can be combusted and reused, and are used for generating high-temperature flue gas to provide heat for a garbage drying device and a garbage pyrolysis device on one hand, and are used for residential life and industrial and agricultural production on the other hand.
The invention has the advantages of simple and easy technical means, small occupied area, high safety coefficient, good energy-saving and emission-reducing effects, wide application prospect and the like, and can be widely applied to rural garbage.
Drawings
Fig. 1 is a schematic structural diagram of the efficient low-pollution rural garbage pyrolysis device.
Fig. 2 is a schematic view of the inner barrel structure of fig. 1.
Fig. 3 is a schematic view of the cartridge of fig. 1.
Fig. 4 is a schematic cross-sectional view of fig. 1.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Examples
As shown in fig. 1 to 4. The invention discloses a high-efficiency low-pollution rural garbage pyrolysis device, which comprises an outer cylinder 4, a middle cylinder 2 and an inner cylinder 1; the outer barrel 4, the middle barrel 2 and the inner barrel 1 are sequentially sleeved from outside to inside, the axes of the outer barrel, the middle barrel and the inner barrel are superposed, and the inner barrel 1 can rotate;
the inner part of the inner cylinder 1 is used as a first flue gas channel 11, a cavity formed between the outer wall of the inner cylinder 1 and the inner wall of the middle cylinder 2 is used as a garbage pyrolysis cavity 12, and a cavity formed between the outer wall of the middle cylinder 2 and the inner wall of the outer cylinder 4 is used as a second flue gas channel 13;
the peripheral wall surface 1-1 of the inner cylinder 1 is provided with a helical blade 1-2 for pushing garbage, so that the garbage spirally moves forward in the garbage pyrolysis cavity 12; the garbage spirally advances to greatly reduce the advancing resistance, and meanwhile, the garbage can stay in the garbage pyrolysis cavity for a long time and is fully pyrolyzed.
The peripheral wall surface of the middle cylinder 2 is provided with spiral flow deflectors 2-3 for flow guiding, so that the flue gas flows in the second flue gas channel 13 according to spiral flow guiding tracks of the spiral flow deflectors 2-3. The spiral flow deflectors 2-3 have small flow resistance to flowing high-temperature flue gas, and the spiral structure prolongs the stroke of the high-temperature flue gas and increases the retention time of the high-temperature flue gas in the second flue gas channel 13.
Inner fins 1-3 are spirally distributed on the inner peripheral wall surface of the inner cylinder 1, and the inner fins 1-3 are used for contacting high-temperature flue gas flowing in the first flue gas channel 11; outer fins 2-2 are spirally distributed on the outer peripheral wall surface of the middle cylinder 2, and the outer fins 2-2 are used for contacting high-temperature flue gas flowing in the second flue gas channel 13; the inner fins 1-3 and the outer fins 2-2 increase the heat exchange area between the high-temperature flue gas and the wall surface, strengthen the disturbance of the flue gas on the inner wall surface of the channel and enhance the heat transfer effect.
High-temperature flue gas flows through the first flue gas channel 11 and the second flue gas channel 13 and heats the pipe walls of the inner cylinder 1 and the middle cylinder 2, and heat is transferred to the garbage pyrolysis cavity 12 and heats garbage in the garbage pyrolysis cavity; the garbage is pyrolyzed in the forward movement in the garbage pyrolysis chamber 12 under the pushing of the helical blades 1-2.
One end of the garbage pyrolysis cavity 12 is communicated with a garbage inlet 2-1 arranged at one end of the middle barrel 2, and the other end of the garbage pyrolysis cavity 12 is communicated with a solid residue outlet 2-4 arranged at the other end of the middle barrel 2.
Two ports of the inner cylinder 1 are respectively used as a smoke inlet/outlet of the first smoke channel 11.
The flue gas inlet pipe 3 and the flue gas outlet pipe 5 of the second flue gas channel 13 are respectively arranged on the pipe walls at the two ends of the outer cylinder 4.
A plurality of product outlet pipes 8 are distributed on the pipe wall along the length direction of the outer barrel 4 at intervals; the axis of the product outlet pipe 8 is perpendicular to the horizontal plane, and the axes of the flue gas inlet pipe 3 and the flue gas outlet pipe 5 are parallel to the horizontal plane.
The rotational kinetic energy of the inner cylinder 1 is provided by a transmission mechanism consisting of a motor 7 and a conveyor belt 6.
The high-temperature flue gas of the first flue gas channel 11 and the second flue gas channel 13 of the device can come from a combustor, and can also come from other equipment for discharging the high-temperature flue gas.
The outer cylinder 4, the middle cylinder 2 and the inner cylinder 1 of the device are of circular cylindrical structures, and the sizes of the outer cylinder, the middle cylinder and the inner cylinder can be determined according to practical application.
The garbage pyrolysis process of the invention is as follows:
the inner cylinder 1 is driven by a transmission mechanism to rotate at a preset speed;
introducing high-temperature flue gas discharged by a combustor into a first flue gas channel 11 and a second flue gas channel 13, wherein the high-temperature flue gas flows in the second flue gas channel 13 according to a spiral flow guide track of spiral flow guide sheets 2-3; the high-temperature flue gas heats the pipe walls of the inner cylinder 1 and the middle cylinder 2, and the heat is transferred to the garbage pyrolysis cavity 12;
the crushed and dried garbage enters a garbage pyrolysis cavity 12 through a garbage inlet 2-1, and is heated and moves forwards in the garbage pyrolysis cavity 12 under the pushing of a helical blade 1-2, is isolated from air in the forward moving process, and is gradually pyrolyzed under the action of heat;
products (such as hydrogen, methane, carbon monoxide, alkane, aromatic hydrocarbon and the like) after pyrolysis are supplied into the combustor through a product outlet pipe 8, and the flue gas after combustion is returned to the first flue gas channel 11 and the second flue gas channel 13 so as to circulate; if the heat required by pyrolysis is insufficient, external auxiliary fuel can be used for supplementing the burner;
and the residual solid residue after the pyrolysis of the garbage is discharged through a solid residue outlet 2-4 and then collected to be used as a building raw material or be concentrated to a large household garbage incineration plant for disposal so as to reduce secondary pollution to the environment.
When the high-temperature flue gas in the pyrolysis process is provided by other external high-temperature flue gas emission equipment (such as a boiler), the pyrolysis product can be collected, stored and utilized.
In practical application, the garbage pyrolysis device and the horizontal plane can form a slightly inclined angle, so that the garbage inlet is slightly higher than the solid residue outlet. The garbage can slide along the wall surface under the action of gravity, and the forward movement of the fine garbage which is not pushed by the helical blades in some gaps is promoted.
As described above, the present invention can be preferably realized.
The embodiments of the present invention are not limited to the above-described embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and they are included in the scope of the present invention.

Claims (3)

1. A high-efficiency low-pollution rural garbage pyrolysis method comprises a garbage pyrolysis device; the garbage pyrolysis device comprises an outer cylinder (4), a middle cylinder (2) and an inner cylinder (1); the outer cylinder (4), the middle cylinder (2) and the inner cylinder (1) are sequentially sleeved from outside to inside, the axes of the outer cylinder, the middle cylinder and the inner cylinder are coincident, and the inner cylinder (1) can rotate;
the inner part of the inner barrel (1) is used as a first flue gas channel (11), a cavity formed between the outer wall of the inner barrel (1) and the inner wall of the middle barrel (2) is used as a garbage pyrolysis cavity (12), and a cavity formed between the outer wall of the middle barrel (2) and the inner wall of the outer barrel (4) is used as a second flue gas channel (13);
the method is characterized in that:
the peripheral wall surface (1-1) of the inner cylinder (1) is provided with a helical blade (1-2) for pushing garbage, so that the garbage spirally moves forward in the garbage pyrolysis cavity (12);
the peripheral wall surface of the middle cylinder (2) is provided with a spiral flow guide sheet (2-3) for flow guide, so that the flue gas flows in the second flue gas channel (13) according to the spiral flow guide track of the spiral flow guide sheet (2-3);
inner fins (1-3) are spirally distributed on the inner circumferential wall surface of the inner barrel (1), and the inner fins (1-3) are used for contacting high-temperature flue gas flowing in the first flue gas channel (11); outer fins (2-2) are spirally distributed on the outer peripheral wall surface of the middle cylinder (2), and the outer fins (2-2) are used for contacting high-temperature flue gas flowing in the second flue gas channel (13);
high-temperature flue gas flows through the first flue gas channel (11) and the second flue gas channel (13) and heats the pipe walls of the inner barrel (1) and the middle barrel (2), and heat is transferred to the garbage pyrolysis cavity (12) and heats garbage in the garbage pyrolysis cavity; the garbage moves forwards in the garbage pyrolysis cavity (12) under the pushing of the helical blades (1-2) for pyrolysis;
the pyrolysis process comprises the following steps:
the inner cylinder (1) is driven by the transmission mechanism to rotate at a preset speed;
introducing high-temperature flue gas discharged by a combustor into a first flue gas channel (11) and a second flue gas channel (13), wherein the high-temperature flue gas flows in the second flue gas channel (13) according to a spiral flow guide track of a spiral flow guide sheet (2-3); the high-temperature flue gas heats the pipe walls of the inner cylinder (1) and the middle cylinder (2), and heat is transferred to the garbage pyrolysis cavity (12);
the crushed and dried garbage enters a garbage pyrolysis cavity (12) through a garbage inlet (2-1), and is heated and moves forwards in the garbage pyrolysis cavity (12) under the pushing of a helical blade (1-2), is isolated from air in the forward moving process, and is gradually pyrolyzed under the action of heat;
products after pyrolysis are supplied into the combustor through a product outlet pipe (8), and the combusted flue gas is returned to the first flue gas channel (11) and the second flue gas channel (13) so as to circulate; if the heat required by pyrolysis is insufficient, external auxiliary fuel can be used for supplementing the burner;
and (3) discharging the residual solid residues after the garbage pyrolysis through a solid residue outlet (2-4) and collecting the solid residues to be used as building raw materials.
2. The high-efficiency low-pollution rural garbage pyrolysis method according to claim 1, characterized in that:
one end of the garbage pyrolysis cavity (12) is communicated with a garbage inlet (2-1) arranged at one end of the middle barrel (2), and the other end of the garbage pyrolysis cavity (12) is communicated with a solid residue outlet (2-4) arranged at the other end of the middle barrel (2);
two ports of the inner cylinder (1) are respectively used as a smoke inlet and a smoke outlet of the first smoke channel (11);
the flue gas inlet pipe (3) and the flue gas outlet pipe (5) of the second flue gas channel (13) are respectively arranged on the pipe walls at the two ends of the outer cylinder (4);
a plurality of product outlet pipes (8) are distributed on the pipe wall along the length direction of the outer cylinder (4) at intervals; the axis of the product outlet pipe (8) is vertical to the horizontal plane, and the axes of the flue gas inlet pipe (3) and the flue gas outlet pipe (5) are parallel to the horizontal plane.
3. The high-efficiency low-pollution rural garbage pyrolysis method according to claim 2, characterized in that:
the rotational kinetic energy of the inner cylinder (1) is provided by a transmission mechanism consisting of a motor (7) and a conveyor belt (6).
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CN201711147363.8A CN107741017B (en) 2017-11-17 2017-11-17 Efficient low-pollution rural garbage pyrolysis method and device
RU2020112696A RU2742940C1 (en) 2017-11-17 2018-10-26 Highly efficient and low-toxic method and device for pyrolysis of domestic wastes in rural areas
PCT/CN2018/112118 WO2019095965A1 (en) 2017-11-17 2018-10-26 High-efficiency and low-pollution rural garbage pyrolysis method and device therefor

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