CN107127205B - Household garbage low-temperature pyrolysis treatment system - Google Patents

Household garbage low-temperature pyrolysis treatment system Download PDF

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Publication number
CN107127205B
CN107127205B CN201710405243.7A CN201710405243A CN107127205B CN 107127205 B CN107127205 B CN 107127205B CN 201710405243 A CN201710405243 A CN 201710405243A CN 107127205 B CN107127205 B CN 107127205B
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China
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pyrolysis
cylinder
cavity
garbage
pipeline
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CN107127205A (en
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吕玺臣
刘大军
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Wuhan Lvfa Huanneng Technology Co ltd
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Wuhan Hongxin Xingran Environmental Protection Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/14—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/16—Details
    • B02C18/18—Knives; Mountings thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/30—Combinations with other devices, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/02—Arrangement of air or material conditioning accessories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/003—Separation of articles by differences in their geometrical form or by difference in their physical properties, e.g. elasticity, compressibility, hardness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/02—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
    • B30B9/14—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing operating with only one screw or worm
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/027—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Food Science & Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The household garbage low-temperature pyrolysis treatment system comprises garbage specific gravity separation equipment, a pyrolysis furnace and a mounting frame, wherein a first mounting platform, a second mounting platform and a third mounting platform are arranged on the mounting frame from top to bottom, the pyrolysis furnace penetrates through the second mounting platform and is mounted on the third mounting platform, the furnace wall of the pyrolysis furnace is of a three-layer structure, the furnace wall of the three-layer structure divides the inner cavity of the pyrolysis furnace into a heat preservation cavity, a heating cavity and a pyrolysis cavity from outside to inside, and the heat preservation cavity is filled with heat preservation media; in conclusion, the invention carries out low-temperature pyrolysis on the household garbage, utilizes the advanced biomass combustion and flue gas waste heat utilization technology, can fully recover energy in the garbage, realizes the targets of reduction, harmlessness and reclamation of garbage treatment, meets the continuous development needs of urban process in China, and has wide market potential and development space from economic benefit analysis and social benefit analysis.

Description

Household garbage low-temperature pyrolysis treatment system
Technical Field
The invention belongs to the technical field of household garbage treatment, and particularly relates to a household garbage low-temperature pyrolysis treatment system.
Background
The existing domestic garbage treatment aims are that: reduction, harmlessness, recycling, etc., wherein reduction and harmlessness are the necessary objectives for disposal of the waste. The current common household garbage treatment modes are as follows: the pyrolysis method, the incineration method and the safe landfill and composting technology have the advantages that the smoke amount generated by the incineration is large, the matched smoke treatment system is complex, so that the investment of the whole equipment cost is large, the technical requirement is high, the operation difficulty is also large, and the method is suitable for large-scale centralized treatment sites with daily treatment capacity of more than 100 tons in large cities; the defect of safe landfill is obvious, the reduction cannot be achieved, the occupied area is large, secondary pollution is easy to generate, and the treatment method which is adopted by the prior art is reduced as much as possible can be used as an effective supplementary mode in other garbage treatment modes; the pyrolysis can effectively solve the problems of reduction and innocuity of garbage, and has the advantages of simple structure, low equipment cost, convenient operation, and more outstanding point that the pyrolysis is carried out on organic matters in the household garbage under low temperature, and inorganic matters such as bricks, glass bottles and the like need to be picked out; however, the existing pyrolysis treatment equipment is not tender to meet the current market demands, has low daily throughput and does not form standardized application, so that the low-temperature pyrolysis equipment is needed to be provided for carrying out reduction, harmless and recycling treatment on the existing household garbage.
Disclosure of Invention
The invention provides a household garbage low-temperature pyrolysis treatment system for carrying out low-temperature pyrolysis treatment on the existing household garbage, aiming at solving the defects in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme: the household garbage low-temperature pyrolysis treatment system comprises garbage specific gravity separation equipment, a pyrolysis furnace and a mounting frame, wherein a first mounting platform, a second mounting platform and a third mounting platform are arranged on the mounting frame from top to bottom, the pyrolysis furnace penetrates through the second mounting platform and is mounted on the third mounting platform, the furnace wall of the pyrolysis furnace is of a three-layer structure, the furnace wall of the three-layer structure divides the inner cavity of the pyrolysis furnace into a heat preservation cavity, a heating cavity and a pyrolysis cavity from outside to inside, and the heat preservation cavity is filled with heat preservation media;
the first mounting platform is provided with a garbage stirring device, the garbage specific gravity separation equipment is connected with a feed inlet of the garbage stirring device through a heat preservation conveying box, a belt conveyor is arranged in the heat preservation conveying box, and the tail end of the belt conveyor is connected with the feed inlet of the garbage stirring device; the bottom of the garbage stirring device is connected with a pyrolysis cavity of the pyrolysis furnace through a shaftless screw conveyor;
the second mounting platform is provided with a waste heat recovery device, a smoke inlet of the waste heat recovery device is connected with the top of the heating cavity of the pyrolysis furnace, and an air outlet of the waste heat recovery device is connected with the heat preservation conveying box;
the third mounting platform is provided with a biomass screw conveyor and a gas filtering and recycling device, the material conveying end of the biomass screw conveyor is connected with the heating cavity of the pyrolysis furnace, and the gas inlet of the gas filtering and recycling device is connected with the top of the pyrolysis cavity of the pyrolysis furnace;
the ground surface below the third mounting platform is provided with solid-liquid separation equipment, and a feed inlet of the solid-liquid separation equipment is connected with the bottom of a pyrolysis cavity of the pyrolysis furnace.
The garbage specific gravity separation device comprises a treatment box, wherein a jet blowing mechanism, an electromagnetic screening mechanism, a specific gravity winnowing mechanism, a vibration screening mechanism and a wolf tooth shredding mechanism are sequentially arranged in the treatment box from top to bottom; the jet flow blowing mechanism comprises a feed hopper, a discharging barrel and a blowing fan, wherein the feed hopper is arranged at the top of the left side of the treatment box, the discharging barrel is vertically fixed at the bottom of the feed hopper, a plurality of jet holes are formed in the discharging barrel, the jet flow direction of part of the jet holes is inclined upwards, the jet flow direction of part of the jet holes is horizontal, the jet flow direction of part of the jet holes is inclined downwards, the blowing fan is fixed on the treatment box, and the blowing fan is connected with all the jet holes through pipelines;
the electromagnetic screening mechanism comprises a movable hopper, a stainless steel plate and a guide plate, wherein the guide plate is obliquely arranged in a left-high right-low manner, the front side edge and the rear side edge of the guide plate are respectively fixed on the front side tank wall and the rear side tank wall of the treatment tank, the stainless steel plate is positioned above the guide plate in parallel, a feed inlet is formed between the left side edge of the stainless steel plate and the left side edge of the guide plate, the feed inlet is positioned under the blanking cylinder, and a discharge outlet is formed between the right side edge of the stainless steel plate and the right side edge of the guide plate; a plurality of electromagnets are arranged above the stainless steel plate and are arranged side by side along the length direction of the stainless steel plate; the front side inner wall and the rear side inner wall of the treatment box are both fixedly provided with channel steel guide rails, the two channel steel guide rails are parallel to the lower part of the stainless steel plate, the front side and the rear side of the movable car hopper are respectively and rotatably connected with two rollers, the two rollers on the front side are in rolling connection with the channel steel guide rails on the front side, the two rollers on the rear side are in rolling connection with the channel steel guide rails on the rear side, and a walking motor is arranged in the center of one roller;
a heavy object collecting box is arranged in the treatment box, the heavy object collecting box is positioned below the discharge hole, and the gravity winnowing mechanism is positioned at the top of the heavy object collecting box;
the vibrating screening mechanism comprises a vibrating frame which is obliquely arranged at the left low side and the right high side, the left side frame of the vibrating frame is connected to the left side wall of the treatment box through a spring, the right side frame of the vibrating frame is connected to the left top of the weight collecting box through a spring, the bottom of the vibrating frame is fixedly provided with a vibrating motor, and a main shaft of the vibrating motor is provided with an eccentric wheel;
the wolf tooth shredder constructs including controlling quick cylinder and the slow cylinder that set up side by side, quick cylinder and slow cylinder rotate around along the horizontal direction and connect on handling the case, and the surface of quick cylinder and slow cylinder all is equipped with the wolf tooth, forms between quick cylinder and the slow cylinder and tears the mouth, tears the mouth department and cuts into mouthful part wolf tooth on the quick cylinder and the part wolf tooth staggered arrangement on the slow cylinder, tears the mouth and is located vibrating frame left side bottom, is equipped with quick driving motor and low-speed driving motor on handling the case, and quick driving motor passes through belt transmission with quick cylinder and is connected, and low-speed driving motor passes through belt transmission with slow cylinder and is connected.
The specific gravity winnowing machine comprises a bottom frame and two groups of air quantity adjusting devices, wherein the bottom frame is fixed at the top of the treatment box through bolts, the two groups of air quantity adjusting devices are arranged side by side up and down, one group of air quantity adjusting devices is fixed on the bottom frame, and the two groups of air quantity adjusting devices are connected through an H-shaped connecting frame; and the treatment box is also provided with a screening fan which is respectively connected with the two groups of air quantity adjusting devices through high-pressure hoses.
The air quantity adjusting device comprises a stepping motor, an inner cylinder body and an outer cylinder body, wherein the central line of the inner cylinder body is arranged in the front-rear horizontal direction, the outer cylinder body is sleeved on the periphery of the inner cylinder body and is opened in the front-rear direction, the left side of the outer cylinder body is provided with an outer long hole in the direction of a bus, the left side of the inner cylinder body is provided with an inner long hole in the direction of the bus, the inner long hole and the outer long hole are communicated to form an air outlet channel, a main chain wheel is arranged on a main shaft of the stepping motor, and a secondary chain wheel is arranged at the center of the rear side of the inner cylinder body and is connected with the secondary chain wheel through a chain; the screening fan is connected with the front side of the inner cylinder body through the high-pressure hose.
The upper surface of the left side of the guide plate is provided with an elastic buffer cushion.
The waste heat recovery device comprises a heat exchange cylinder and a purifying tank, wherein the heat exchange cylinder is fixed on a second mounting platform, the central line of the heat exchange cylinder is arranged along the vertical direction, the top of the heat exchange cylinder is communicated with the inner cavity of the heat preservation conveying box through a waste heat pipeline, the bottom of the heat exchange cylinder is connected with a blower, a coil pipe is arranged in the heat exchange cylinder, the lower end part of the coil pipe is connected with the purifying tank, purifying solution is contained in the purifying tank, the top of the purifying tank is connected with an exhaust pipeline, the upper end part of the coil pipe is connected with the heating cavity of the pyrolysis furnace through a heat exchange pipeline, and a pipeline fan is arranged on the heat exchange pipeline.
The gas filtering and recycling device comprises a spray tower, an electrostatic dust collection box and a gas collection tank; the top of spray column is through first trachea and pyrolysis oven's pyrolysis chamber top intercommunication, is equipped with the air pump on the first trachea, and the bottom of spray column is connected with electrostatic precipitator case through the second trachea, and electrostatic precipitator case is connected with gas collection jar through the third trachea, and gas collection jar is connected with the heating chamber of pyrolysis oven through the fourth trachea, is equipped with the valve body on the fourth trachea.
The solid-liquid separation equipment comprises a vertical pipeline, an inclined pipeline, an outer supporting cylinder, an inner extruding cylinder, a spiral extruding mechanism and a spiral material guiding mechanism, wherein the vertical pipeline is fixed at the bottom of the pyrolysis furnace, the upper end of the vertical pipeline is communicated with a pyrolysis cavity of the pyrolysis furnace, the outer supporting cylinder is horizontally arranged, one end of the inclined pipeline is connected with the lower end of the vertical pipeline, the other end of the inclined pipeline is connected with the right end of the outer supporting cylinder, the inner extruding cylinder is coaxially arranged in the outer supporting cylinder through a bracket, the spiral material guiding mechanism comprises a speed reducing motor and a material guiding rotating shaft, the material guiding rotating shaft is coaxially and rotatably connected in the vertical pipeline, a material guiding spiral blade is arranged on the material guiding rotating shaft, the upper end of the material guiding rotating shaft stretches into the pyrolysis cavity of the pyrolysis furnace, the lower end of the material guiding rotating shaft stretches out of the lower end face of the vertical pipeline and then is connected with a driven bevel gear, the speed reducing motor is fixed on the ground, a main shaft of the speed reducing motor is connected with a driving bevel gear, and the driving bevel gear is meshed with the driven bevel gear; the spiral extrusion mechanism comprises a variable frequency motor, a coke collecting box, a liquid collecting tank and a variable diameter rotating shaft, wherein the variable diameter rotating shaft is coaxially and rotatably connected in the inner extrusion cylinder, a plurality of through holes are formed in the cylinder wall of the inner extrusion cylinder, and a layer of filter cloth is arranged on the inner side of the cylinder wall of the inner extrusion cylinder; the radius of the variable-diameter rotating shaft gradually decreases from left to right, an extrusion spiral blade is arranged on the variable-diameter rotating shaft, the left end part of the variable-diameter rotating shaft extends out of the inner extrusion cylinder and is positioned in the outer supporting cylinder, a driven sprocket is arranged at the left end of the variable-diameter rotating shaft, a variable-frequency motor is fixed at the left end part of the outer supporting cylinder, a driving sprocket is arranged on a main shaft of the variable-frequency motor, and the driving sprocket is in transmission connection with the driven sprocket through a chain; the left end parts of the inner extrusion cylinder and the outer support cylinder are correspondingly provided with a discharge hole, the coke collecting box is connected with the discharge hole through a coke collecting pipeline, and the liquid collecting tank is connected with the outer support cylinder through a liquid collecting pipeline.
By adopting the technical scheme, the working principle of the invention is as follows: when the household garbage is subjected to pyrolysis treatment, the household garbage is firstly sorted through garbage specific gravity separation equipment, inorganic matters such as bricks, glass bottles and the like in the household garbage are screened out, and the specific sorting process is as follows: starting a blowing fan, the blowing fan conveys strong air to each jet hole on a blanking barrel through a pipeline, then the strong air is ejected into the blanking barrel through the jet holes, household garbage falls into the blanking barrel from a feed hopper, in the falling process, the high-speed air ejected by the jet holes fully breaks up the household garbage, the scattered household garbage falls into a guide plate from a feed inlet, then slides downwards along the guide plate, in the sliding process, an electromagnet is electrified, the electromagnet magnetizes a stainless steel plate, the stainless steel plate obtains strong magnetism to suck out magnetic substances such as iron, aluminum and the like on the guide plate, the household garbage falls onto a vibrating frame from a discharge hole, in the vertical falling process, a screening fan is started and feeds the air into an inner barrel through a pipeline, then the air is ejected outwards from an air outlet channel at the left side, the blown strong air blows out lighter substances in the household garbage, the heavier substances fall into a weight collecting box, the heavier substances are generally glass bottles, or bricks and other inorganic materials, the garbage can only be treated, two groups of air volume adjusting devices are arranged, the air volume adjusting devices are arranged, and the air volume adjusting method is smaller than that the air volume on the lower side is gradually, and the method is that the air volume adjusting the air volume is lower than the air volume on the lower side: starting a stepping motor, and driving the inner cylinder body to rotate through chain transmission by the stepping motor, so that the space communicated between the inner long hole and the outer long hole is changed, and the air quantity of the air outlet channel is adjusted; the lighter material is blown to the vibrating frame, vibrating motor drives the eccentric wheel and rotates, the eccentric wheel rotates and drives the vibrating frame to produce the vibration, thereby the small rubbish of volume on the vibrating frame sinks to the frame bottom of vibrating frame, the great rubbish of volume is located the upper strata, similar to house dustpan screening, later domestic waste drops to shredding port from the vibrating frame, quick driving motor drives quick cylinder and rotates clockwise, low-speed driving motor drives slow cylinder anticlockwise rotation, later fall into the domestic waste of shredding port and tear under the effect of wolf tooth, accomplish the sorting pretreatment process of domestic waste so far.
In addition, after the magnetic substances are adsorbed on the stainless steel plate, a traveling motor is started, the traveling motor drives a roller to rotate, a movable car hopper starts to move along a channel steel guide rail, then an electrified switch on an electromagnet is sequentially disconnected, the electromagnet loses magnetism, and the magnetic substances on the stainless steel plate sequentially fall into the movable car hopper, so that the collection work of the magnetic substances on the stainless steel plate is completed;
the screened household garbage is conveyed into a garbage stirring device through a belt conveyor (the garbage stirring device is in the prior art, the specific structure of the garbage stirring device is not repeated), in the conveying process, as the air outlet of the waste heat recovery device is connected with the heat preservation conveying box, the waste heat recovery device conveys waste heat into the heat preservation conveying box, the waste heat dries the household garbage on the belt conveyor, the household garbage enters the garbage stirring device after being dried, and then the shaftless screw conveyor conveys the household garbage in the household garbage stirring device into a pyrolysis cavity of the pyrolysis furnace; starting a biomass screw conveyor, conveying biomass to a heating cavity of a pyrolysis furnace by the biomass screw conveyor, wherein the biomass can be a combustion product of straws, then burning the biomass in the heating cavity of the pyrolysis furnace, controlling the temperature in the pyrolysis cavity of the pyrolysis furnace to be 350 ℃, and performing pyrolysis on household garbage in the pyrolysis cavity of the pyrolysis furnace to generate combustible gas, liquid and solid matters, wherein the combustible gas is hydrogen, methane and carbon monoxide, the liquid is organic matters such as methanol, acetone and acetaldehyde and tar, and the solid matters are mainly coke and carbon black; in the pyrolysis process, smoke generated by biomass combustion enters a coil pipe in a heat exchange cylinder through a heat exchange pipeline under the drive of a pipeline fan, then the air is sent into the heat exchange cylinder by the fan, high-temperature smoke heats the coil pipe, the air in the heat exchange cylinder enters an inner cavity of a heat preservation conveying box through a waste heat pipeline after being heated by the coil pipe, so that household garbage in the heat preservation conveying box is dried, in addition, the high-temperature smoke enters a purifying tank after passing through the coil pipe, the purifying tank contains purifying solution which can be alkali solution, and the alkali solution absorbs vulcanized toxic gas in the smoke and is discharged outwards through an exhaust pipeline; the method comprises the steps that gas generated by pyrolysis of household garbage in a pyrolysis furnace enters a spray tower through a first gas pipe under the drive of a gas pump, large-particle impurities in the gas are removed by the spray tower, then the gas enters an electrostatic dust removing box through a second gas pipe, small-particle impurities in the gas are removed by the electrostatic dust removing box, then the gas enters a gas collecting tank through a third gas pipe, a valve body can be selectively opened, and combustible gas in the gas collecting tank is sent into a heating cavity of the pyrolysis furnace through a fourth gas pipe so as to assist biomass combustion in the heating cavity;
solid-liquid separation is carried out on solid-liquid substances generated by pyrolysis of household garbage under the operation of solid-liquid separation equipment, and the specific working process is as follows: starting a gear motor and a variable frequency motor, wherein the gear motor drives a guide rotating shaft to rotate through a bevel gear transmission structure, the guide rotating shaft drives a guide spiral blade to rotate, the guide spiral blade guides out solid and liquid substances generated by pyrolysis in a pyrolysis cavity, the solid and liquid substances finally enter an inclined pipeline through a vertical pipeline and then enter an inner extrusion cylinder, the variable frequency motor drives a variable diameter rotating shaft to rotate through a chain transmission structure, and the radius of the variable diameter rotating shaft gradually becomes smaller from left to right, so that the solid and liquid substances move from right to left under the driving of the extrusion spiral blade, the space between the inner extrusion cylinder and the variable diameter rotating shaft gradually becomes smaller in the moving process, the solid and liquid substances are extruded, the liquid substances in the solid and liquid substances are extruded, penetrate into the inner wall of an outer support cylinder under the check of a filter cloth, finally enter a liquid collecting tank from a liquid collecting pipeline, and the extruded solid substances enter a coke collecting box along a coke collecting pipeline, so as to finish the separation treatment of household garbage pyrolysis products.
In summary, the organic matters and the inorganic matters in the household garbage are separated through the garbage specific gravity separation equipment, and then the separated household garbage is conveyed into the garbage stirring device through the belt conveyor, and the household garbage is dried by utilizing waste heat in the conveying process; the household garbage enters a pyrolysis cavity of a pyrolysis furnace after being stirred, heat is provided by burning biomass fuel to supply heat required by pyrolysis of the household garbage in the pyrolysis furnace, the temperature in the pyrolysis furnace is ensured to be about 350 ℃, at the moment, the household garbage starts pyrolysis at low temperature, three types of pyrolysis products are respectively gaseous substances, solid substances and liquid substances, wherein the gaseous substances are combustible gases such as hydrogen, methane and carbon monoxide, the combustible gases are collected in a gas collecting tank after being sprayed and dedusted by a gas filtering and recycling device and subjected to electrostatic dust removal, the solid substances are mainly coke and carbon black, the liquid substances are organic substances such as methanol, acetone and acetaldehyde and tar, the solid substances and the liquid substances are mixed together, the solid substances and the liquid substances are separated and stored respectively under the action of solid-liquid separation equipment, and the stored combustible gases can be used for civil heating, power generation and the like, or can be used as chemical raw materials such as synthetic methanol, ammonia and the like, and even can be considered as fuel of a fuel cell; the liquid is a high-energy carrier, basically contains no sulfur, nitrogen and metal components, is a green fuel, and the solid can be used as an industrial fuel to prepare a carbon-based fertilizer, improve soil performance and the like; the invention carries out low-temperature pyrolysis on the household garbage, utilizes advanced biomass combustion and flue gas waste heat utilization technology, can fully recover energy in the garbage, realizes the targets of reduction, harmlessness and reclamation of garbage treatment, meets the continuous development needs of urban process in China, and has wide market potential and development space from economic benefit analysis and social benefit analysis.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic structural view of a garbage specific gravity separation apparatus;
FIG. 3 is a schematic structural view of a jet blowing mechanism;
FIG. 4 is a schematic view of the installation of a mobile hopper;
FIG. 5 is a schematic view of the structure of the gravity separation mechanism;
FIG. 6 is a schematic diagram of the assembly of the inner and outer cylinders
FIG. 7 is a schematic view of the structure of the solid-liquid separation apparatus.
Detailed Description
As shown in fig. 1-7, the household garbage low-temperature pyrolysis treatment system comprises garbage specific gravity separation equipment 40, a pyrolysis furnace 41 and a mounting frame 42, wherein a first mounting platform 43, a second mounting platform 44 and a third mounting platform 45 are arranged on the mounting frame 42 from top to bottom, the pyrolysis furnace 41 penetrates through the second mounting platform 44 and is mounted on the third mounting platform 45, the furnace wall of the pyrolysis furnace 41 is of a three-layer structure, the furnace wall of the three-layer structure divides the inner cavity of the pyrolysis furnace 41 into a heat preservation cavity 46, a heating cavity 47 and a pyrolysis cavity 48 from outside to inside, and a heat preservation medium is filled in the heat preservation cavity 46;
the first mounting platform 43 is provided with a garbage stirring device 49, the garbage specific gravity separation equipment 40 is connected with a feed inlet of the garbage stirring device 49 through a heat preservation conveying box 50, a belt conveyor 51 is arranged in the heat preservation conveying box 50, and the tail end of the belt conveyor 51 is connected with the feed inlet of the garbage stirring device 49; the bottom of the garbage stirring device 49 is connected with the pyrolysis cavity 48 of the pyrolysis furnace 41 through a shaftless screw conveyor 52; (two shaftless screw conveyors 52 are shown in FIG. 1 to increase the conveying capacity)
The second mounting platform 44 is provided with a waste heat recovery device, a smoke inlet of the waste heat recovery device is connected with the top of the heating cavity 47 of the pyrolysis furnace 41, and an air outlet of the waste heat recovery device is connected with the heat preservation conveying box 50;
the third mounting platform 45 is provided with a biomass screw conveyor 53 and a gas filtering and recycling device, the material conveying end of the biomass screw conveyor 53 is connected with the heating cavity 47 of the pyrolysis furnace 41, and the gas inlet of the gas filtering and recycling device is connected with the top of the pyrolysis cavity 48 of the pyrolysis furnace 41;
a solid-liquid separation device is arranged on the ground surface below the third mounting platform 45, and a feed inlet of the solid-liquid separation device is connected with the bottom of the pyrolysis cavity 48 of the pyrolysis furnace 41.
The garbage specific gravity separation device 40 comprises a processing box 1, wherein a jet blowing mechanism, an electromagnetic screening mechanism, a specific gravity winnowing mechanism, a vibration screening mechanism and a wolf tooth shredding mechanism are sequentially arranged in the processing box 1 from top to bottom; the jet flow blowing mechanism comprises a feed hopper 2, a discharging barrel 3 and a blowing fan 4, wherein the feed hopper 2 is arranged at the top of the left side of the processing box 1, the discharging barrel 3 is vertically fixed at the bottom of the feed hopper 2, a plurality of jet holes 5 are formed in the discharging barrel 3, the jet flow direction of part of the jet holes 5 is inclined upwards, the jet flow direction of part of the jet holes 5 is horizontal, the jet flow direction of part of the jet holes 5 is inclined downwards, the blowing fan 4 is fixed on the processing box 1, and the blowing fan 4 is connected with all the jet holes 5 through pipelines;
the electromagnetic screening mechanism comprises a movable hopper 6, a stainless steel plate 7 and a guide plate 8, wherein the guide plate 8 is obliquely arranged at a left high side and a right low side, the guide plate forms an included angle of 30-45 degrees with the horizontal plane, garbage can automatically slide down along the guide plate 8, the front side edge and the rear side edge of the guide plate 8 are respectively fixed on the front side box wall and the rear side box wall of the treatment box 1, the stainless steel plate 7 is positioned above the guide plate 8 in parallel, a feed inlet 14 is formed between the left side edge of the stainless steel plate 7 and the left side edge of the guide plate 8, the feed inlet 14 is positioned under the blanking cylinder 3, and a discharge outlet 15 is formed between the right side edge of the stainless steel plate 7 and the right side edge of the guide plate 8; a plurality of electromagnets 9 are arranged above the stainless steel plate 7, and the electromagnets 9 are arranged side by side along the length direction of the stainless steel plate 7; the front side inner wall and the rear side inner wall of the treatment box 1 are both fixedly provided with channel steel guide rails 10, the two channel steel guide rails 10 are positioned below the stainless steel plate 7 in parallel, the front side and the rear side of the movable hopper 6 are respectively connected with two rollers 11 in a rotating way, the two rollers 11 positioned at the front side are connected onto the channel steel guide rails 10 at the front side in a rolling way, the two rollers 11 positioned at the rear side are connected onto the channel steel guide rails 10 at the rear side in a rolling way, a walking motor is arranged in the center of one roller 11, and the transmission connection structure of the walking motor and the rollers 11 is the same as the driving structure of an electric bicycle or an electric motorcycle in the prior market;
the treatment box 1 is internally provided with a heavy object collecting box 13, the heavy object collecting box 13 is positioned below the discharge hole 15, and the gravity winnowing mechanism is positioned at the top of the heavy object collecting box 13;
the vibrating screening mechanism comprises a vibrating frame 16 which is obliquely arranged at the left low side and the right high side, the left side frame of the vibrating frame 16 is connected to the left side wall of the treatment box 1 through a spring 17, the right side frame of the vibrating frame 16 is connected to the left top of the weight collecting box 13 through a spring 17, a vibrating motor 18 is fixed at the bottom of the vibrating frame 16, and an eccentric wheel 19 is arranged on a main shaft of the vibrating motor 18;
the wolf tooth shredder mechanism comprises a fast roller 20 and a slow roller 21 which are arranged side by side left and right, the fast roller 20 and the slow roller 21 are connected to the treatment box 1 in a rotating mode along the front-back horizontal direction, wolf teeth are arranged on the outer surfaces of the fast roller 20 and the slow roller 21, shredding openings 22 are formed between the fast roller 20 and the slow roller 21, part of wolf teeth on the fast roller 20 and part of wolf teeth on the slow roller 21 at the shredding openings 22 are arranged in a staggered mode, the shredding openings 22 are located at the left bottom of the vibrating frame 16, a fast driving motor and a low-speed driving motor are arranged on the treatment box 1, the fast driving motor is connected with the fast roller 20 through belt transmission, and the low-speed driving motor is connected with the slow roller 21 through belt transmission.
The specific gravity winnowing machine comprises a bottom frame 23 and two groups of air quantity adjusting devices 24, wherein the bottom frame 23 is fixed at the top of the treatment box 1 through bolts, the two groups of air quantity adjusting devices 24 are arranged side by side up and down, one group of air quantity adjusting devices 24 is fixed on the bottom frame 23, and the two groups of air quantity adjusting devices 24 are connected through an H-shaped connecting frame 25; the treatment box 1 is also provided with a screening fan 26, and the screening fan 26 is respectively connected with two groups of air quantity adjusting devices 24 through high-pressure hoses.
The air quantity regulating device 24 comprises a stepping motor 27, an inner cylinder 28 and an outer cylinder 29, wherein the central line of the inner cylinder 28 is arranged in the front-back horizontal direction, the outer cylinder 29 is sleeved on the periphery of the inner cylinder 28 and is open in the front-back direction, an outer long hole 30 is formed in the left side of the outer cylinder 29 in the direction of a bus, an inner long hole 31 is formed in the left side of the inner cylinder 28 in the direction of the bus, the inner long hole 31 and the outer long hole 30 are communicated to form an air outlet channel, a main chain wheel 32 is arranged on a main shaft of the stepping motor 27, a secondary chain wheel 33 is arranged in the center of the rear side of the inner cylinder 28, and the main chain wheel 32 is connected with the secondary chain wheel 33 through a chain; the screening fan 26 is connected to the front side of the inner cylinder 28 via the high-pressure hose 35.
The upper left surface of the baffle 8 is provided with a resilient cushion 34.
The waste heat recovery device comprises a heat exchange cylinder 54 and a purifying tank 55, wherein the heat exchange cylinder 54 is fixed on the second mounting platform 44, the central line of the heat exchange cylinder 54 is arranged in the vertical direction, the top of the heat exchange cylinder 54 is communicated with the inner cavity of the heat preservation conveying box 50 through a waste heat pipeline 56, the bottom of the heat exchange cylinder 54 is connected with a blower 57, a coil 58 is coiled in the heat exchange cylinder 54, the lower end part of the coil 58 is connected with the purifying tank 55, purifying solution is contained in the purifying tank 55, the top of the purifying tank 55 is connected with an exhaust pipeline 59, the upper end part of the coil 58 is connected with the heating cavity 47 of the pyrolysis furnace 41 through a heat exchange pipeline 60, and a pipeline fan 61 is arranged on the heat exchange pipeline 60.
The gas filtering and recycling device comprises a spray tower 62, an electrostatic dust removing box 63 and a gas collecting tank 64; the top of spray column 62 is through first trachea and pyrolysis chamber 48 top intercommunication of pyrolysis oven 41, is equipped with air pump 65 on the first trachea, and the bottom of spray column 62 is connected with static dust removal case 63 through the second trachea, and static dust removal case 63 is connected with gas collection tank 64 through the third trachea, and gas collection tank 64 is connected with the heating chamber 47 of pyrolysis oven 41 through the fourth trachea, is equipped with valve body 70 on the fourth trachea.
The solid-liquid separation device comprises a vertical pipeline 71, an inclined pipeline 72, an outer supporting cylinder 73, an inner extruding cylinder 74, a spiral extruding mechanism and a spiral material guiding mechanism, wherein the vertical pipeline 71 is fixed at the bottom of the pyrolysis furnace 41, the upper end of the vertical pipeline 71 is communicated with the pyrolysis cavity 48 of the pyrolysis furnace 41, the outer supporting cylinder 73 is horizontally arranged, one end of the inclined pipeline 72 is connected with the lower end of the vertical pipeline 71, the other end of the inclined pipeline 72 is connected with the right end of the outer supporting cylinder 73, the inner extruding cylinder 74 is coaxially arranged in the outer supporting cylinder 73 through a bracket, the spiral material guiding mechanism comprises a speed reducing motor 75 and a material guiding rotating shaft 76, the material guiding rotating shaft 76 is coaxially and rotatably connected in the vertical pipeline 71, a material guiding spiral blade 90 is arranged on the material guiding rotating shaft 76, the upper end of the material guiding rotating shaft 76 extends into the pyrolysis cavity 48 of the pyrolysis furnace 41, the lower end of the material guiding rotating shaft 76 extends out of the lower end face of the vertical pipeline 71 and is then connected with a driven bevel gear 77, the speed reducing motor 75 is fixed on the ground, a main shaft of the speed reducing motor 75 is connected with a driving bevel gear 78, and the driving bevel gear 78 is meshed with the driven bevel gear 77; the spiral extrusion mechanism comprises a variable frequency motor 79, a coke collecting tank 80, a liquid collecting tank 81 and a variable diameter rotating shaft 82, wherein the variable diameter rotating shaft 82 is coaxially and rotatably connected in the inner extrusion cylinder 74, a plurality of through holes are formed in the cylinder wall of the inner extrusion cylinder 74, and a layer of filter cloth 83 is arranged on the inner side of the cylinder wall of the inner extrusion cylinder 74; the radius of the variable diameter rotating shaft 82 gradually decreases from left to right, an extrusion spiral blade 84 is arranged on the variable diameter rotating shaft 82, the left end part of the variable diameter rotating shaft 82 extends out of the inner extrusion cylinder 74 and is positioned in the outer support cylinder 73, a driven sprocket 85 is arranged at the left end of the variable diameter rotating shaft 82, a variable frequency motor 79 is fixed at the left end part of the outer support cylinder 73, a driving sprocket 86 is arranged on a main shaft of the variable frequency motor 79, and the driving sprocket 86 is in transmission connection with the driven sprocket 85 through a chain; the left end parts of the inner extrusion cylinder 74 and the outer support cylinder 73 are correspondingly provided with a discharge hole, the coke collecting box 80 is connected with the discharge hole through a coke collecting pipeline 88, and the liquid collecting tank 81 is connected with the outer support cylinder 73 through a liquid collecting pipeline. (two sets of screw extrusion mechanisms are shown in FIG. 1 to increase throughput)
In the invention, when the household garbage is pyrolyzed, the household garbage is firstly sorted by the garbage specific gravity separation equipment 40, and inorganic matters such as bricks, glass bottles and the like in the household garbage are screened out, and the specific sorting process is as follows: starting a blowing fan 4, the blowing fan 4 conveys strong current wind to each jet hole 5 on a blanking barrel 3 through a pipeline, then the strong current wind is ejected into the blanking barrel 3 through the jet holes 5, household garbage falls into the blanking barrel 3 from a feed hopper 2, in the falling process, the household garbage is fully scattered by high-speed wind current ejected by the jet holes 5, then the scattered household garbage falls into a guide plate 8 from a feed inlet 14, then slides downwards along the guide plate 8, in the sliding process, an electromagnet 9 is electrified, the electromagnet 9 magnetizes a stainless steel plate 7, the stainless steel plate 7 acquires strong magnetism to suck out magnetic substances such as iron and aluminum on the guide plate 8, then the household garbage falls onto a vibrating frame 16 from a discharge hole 15, in the vertical falling process, a screening fan 26 is started and feeds wind into an inner barrel 28 through a pipeline, then the household garbage is ejected outwards from a left air outlet channel, the blown strong wind blows lighter substances in the household garbage into a guide plate 13, the heavy substances fall into a heavy collecting box 13, the heavy substances are glass or bricks or the like, the air quantity can be gradually adjusted to be small, and the air quantity can be gradually adjusted, and the method can be used for the garbage disposal is that the garbage disposal is carried out on two sides, and the garbage disposal device is only has small air quantity: starting the stepping motor 27, and driving the inner cylinder 28 to rotate by the stepping motor 27 through chain transmission, so as to change the space communicated between the inner long hole 31 and the outer long hole 30, thereby adjusting the air quantity of the air outlet channel; lighter substances are blown onto the vibrating frame 16, the vibrating motor 18 drives the eccentric wheel 19 to rotate, the eccentric wheel 19 rotates to drive the vibrating frame 16 to vibrate, therefore, small-size garbage on the vibrating frame 16 sinks to the bottom of the vibrating frame 16, large-size garbage is located on the upper layer and is similar to household dustpan screening, then household garbage falls to the shredding port 22 from the vibrating frame 16, the quick driving motor drives the quick roller 20 to rotate clockwise, the low-speed driving motor drives the slow roller 21 to rotate anticlockwise, and then the household garbage falling to the shredding port 22 is shredded under the action of wolf teeth, so that the sorting pretreatment process of the household garbage is completed. In addition, after the magnetic substances are adsorbed onto the stainless steel plate 7, a traveling motor is started, the traveling motor drives a roller 11 to rotate, the movable hopper 6 starts to move along the channel steel guide rail 10, then the power-on switch on the electromagnet 9 is sequentially turned off, the electromagnet 9 loses magnetism, and the magnetic substances on the stainless steel plate 7 sequentially fall into the movable hopper 6, so that the collection work of the magnetic substances on the stainless steel plate 7 is completed;
the screened household garbage is conveyed into a garbage stirring device 49 through a belt conveyor 51 (the garbage stirring device 49 is in the prior art, the specific structure of the garbage stirring device is not repeated), in the conveying process, as the air outlet of the waste heat recovery device is connected with the heat preservation conveying box 50, the waste heat recovery device conveys waste heat into the heat preservation conveying box 50, the waste heat dries the household garbage on the belt conveyor 51, the dried household garbage enters the garbage stirring device 49, and then the shaftless screw conveyor 52 conveys the household garbage in the household garbage stirring device 49 into the pyrolysis cavity 48 of the pyrolysis furnace 41; starting a biomass screw conveyor 53, wherein the biomass screw conveyor 53 conveys biomass to a heating cavity 47 of a pyrolysis furnace 41, the biomass can be a combustion product of straws, then the biomass is combusted in the heating cavity 47 of the pyrolysis furnace 41, the temperature in a pyrolysis cavity 48 of the pyrolysis furnace 41 is controlled to be 350 ℃, domestic garbage is pyrolyzed in the pyrolysis cavity 48 of the pyrolysis furnace 41 to generate combustible gas, liquid and solid matters, the combustible gas is hydrogen, methane and carbon monoxide, the liquid is organic matters and tar such as methanol, acetone and acetaldehyde, and the solid matters are mainly coke and carbon black; in the pyrolysis process, smoke generated by biomass combustion enters a coil pipe 58 in a heat exchange cylinder 54 through a heat exchange pipeline 60 under the drive of a pipeline fan 61, then the air is sent into the heat exchange cylinder 54 by a blower 57, high-temperature smoke heats the coil pipe 58, the air in the heat exchange cylinder 54 is heated by the coil pipe 58 and then enters an inner cavity of a heat preservation conveying box 50 through a waste heat pipeline 56, so that household garbage in the heat preservation conveying box 50 is dried, in addition, the high-temperature smoke enters a purifying tank 55 after passing through the coil pipe 58, purifying solution is contained in the purifying tank 55, the purifying solution can be alkali solution, the alkali solution absorbs vulcanized toxic gas in the smoke, and then the sulfur is discharged outwards through an exhaust pipeline 59; the gas generated by pyrolysis of the household garbage in the pyrolysis furnace 41 enters the spray tower 62 through the first gas pipe under the drive of the gas pump 65, the spray tower 62 removes large-particle impurities in the gas, then the gas enters the electrostatic dust removing box 63 through the second gas pipe, the electrostatic dust removing box 63 removes small-particle impurities in the gas, then the gas enters the gas collecting tank 64 through the third gas pipe, in addition, the valve body 70 can be selectively opened, and the combustible gas in the gas collecting tank 64 is sent into the heating cavity 47 of the pyrolysis furnace 41 through the fourth gas pipe so as to assist the biomass combustion in the heating cavity 47;
solid-liquid separation is carried out on solid-liquid substances generated by pyrolysis of household garbage under the operation of solid-liquid separation equipment, and the specific working process is as follows: the speed reducing motor 75 and the variable frequency motor 79 are started, the speed reducing motor 75 drives the material guiding rotating shaft 76 to rotate through the bevel gear transmission structure, the material guiding rotating shaft 76 rotates to drive the material guiding spiral blade to rotate, the material guiding spiral blade guides out solid and liquid substances generated by pyrolysis in the pyrolysis cavity 48, finally, the solid and liquid substances enter the inclined pipeline through the vertical pipeline 71 and then enter the inner extrusion cylinder 74, the variable frequency motor 79 drives the variable diameter rotating shaft 82 to rotate through the chain transmission structure, and the radius of the variable diameter rotating shaft 82 gradually becomes smaller from left to right, so that the solid and liquid substances move from right to left under the driving of the extrusion spiral blade 84, the space between the inner extrusion cylinder 74 and the variable diameter rotating shaft 82 gradually becomes smaller in the moving process, the solid and liquid substances are extruded, the liquid substances are extruded out, the solid and liquid substances permeate into the inner wall of the outer support cylinder 73 through the through holes under the check of the filter cloth 83, finally, the extruded solid substances enter the liquid collection tank 81 along the coke collection pipeline 88, and the extruded solid substances enter the coke collection tank 80, so that the separation treatment of the household garbage pyrolysis products is completed.
The present embodiment is not limited in any way by the shape, material, structure, etc. of the present invention, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical substance of the present invention are all included in the scope of protection of the technical solution of the present invention.

Claims (5)

1. Domestic waste low temperature pyrolysis treatment system, its characterized in that: the garbage specific gravity separation device comprises garbage specific gravity separation equipment, a pyrolysis furnace and a mounting frame, wherein a first mounting platform, a second mounting platform and a third mounting platform are arranged on the mounting frame from top to bottom, the pyrolysis furnace penetrates through the second mounting platform and is mounted on the third mounting platform, the furnace wall of the pyrolysis furnace is of a three-layer structure, the furnace wall of the three-layer structure divides the inner cavity of the pyrolysis furnace into a heat preservation cavity, a heating cavity and a pyrolysis cavity from outside to inside, and heat preservation media are filled in the heat preservation cavity;
the first mounting platform is provided with a garbage stirring device, the garbage specific gravity separation equipment is connected with a feed inlet of the garbage stirring device through a heat preservation conveying box, a belt conveyor is arranged in the heat preservation conveying box, and the tail end of the belt conveyor is connected with the feed inlet of the garbage stirring device; the bottom of the garbage stirring device is connected with a pyrolysis cavity of the pyrolysis furnace through a shaftless screw conveyor;
the second mounting platform is provided with a waste heat recovery device, a smoke inlet of the waste heat recovery device is connected with the top of the heating cavity of the pyrolysis furnace, and an air outlet of the waste heat recovery device is connected with the heat preservation conveying box;
the third mounting platform is provided with a biomass screw conveyor and a gas filtering and recycling device, the material conveying end of the biomass screw conveyor is connected with the heating cavity of the pyrolysis furnace, and the gas inlet of the gas filtering and recycling device is connected with the top of the pyrolysis cavity of the pyrolysis furnace;
the ground surface below the third mounting platform is provided with solid-liquid separation equipment, and a feed inlet of the solid-liquid separation equipment is connected with the bottom of a pyrolysis cavity of the pyrolysis furnace;
the garbage specific gravity separation device comprises a treatment box, wherein a jet blowing mechanism, an electromagnetic screening mechanism, a specific gravity winnowing mechanism, a vibration screening mechanism and a wolf tooth shredding mechanism are sequentially arranged in the treatment box from top to bottom; the jet flow blowing mechanism comprises a feed hopper, a discharging barrel and a blowing fan, wherein the feed hopper is arranged at the top of the left side of the treatment box, the discharging barrel is vertically fixed at the bottom of the feed hopper, a plurality of jet holes are formed in the discharging barrel, the jet flow direction of part of the jet holes is inclined upwards, the jet flow direction of part of the jet holes is horizontal, the jet flow direction of part of the jet holes is inclined downwards, the blowing fan is fixed on the treatment box, and the blowing fan is connected with all the jet holes through pipelines;
the electromagnetic screening mechanism comprises a movable hopper, a stainless steel plate and a guide plate, wherein the guide plate is obliquely arranged in a left-high right-low manner, the front side edge and the rear side edge of the guide plate are respectively fixed on the front side tank wall and the rear side tank wall of the treatment tank, the stainless steel plate is positioned above the guide plate in parallel, a feed inlet is formed between the left side edge of the stainless steel plate and the left side edge of the guide plate, the feed inlet is positioned under the blanking cylinder, and a discharge outlet is formed between the right side edge of the stainless steel plate and the right side edge of the guide plate; a plurality of electromagnets are arranged above the stainless steel plate and are arranged side by side along the length direction of the stainless steel plate; the front side inner wall and the rear side inner wall of the treatment box are both fixedly provided with channel steel guide rails, the two channel steel guide rails are parallel to the lower part of the stainless steel plate, the front side and the rear side of the movable car hopper are respectively and rotatably connected with two rollers, the two rollers on the front side are in rolling connection with the channel steel guide rails on the front side, the two rollers on the rear side are in rolling connection with the channel steel guide rails on the rear side, and a walking motor is arranged in the center of one roller;
a heavy object collecting box is arranged in the treatment box, the heavy object collecting box is positioned below the discharge hole, and the gravity winnowing mechanism is positioned at the top of the heavy object collecting box;
the vibrating screening mechanism comprises a vibrating frame which is obliquely arranged at the left low side and the right high side, the left side frame of the vibrating frame is connected to the left side wall of the treatment box through a spring, the right side frame of the vibrating frame is connected to the left top of the weight collecting box through a spring, the bottom of the vibrating frame is fixedly provided with a vibrating motor, and a main shaft of the vibrating motor is provided with an eccentric wheel;
the wolf tooth shredding mechanism comprises a fast roller and a slow roller which are arranged side by side left and right, the fast roller and the slow roller are rotationally connected to a processing box along the front-back horizontal direction, wolf teeth are arranged on the outer surfaces of the fast roller and the slow roller, shredding openings are formed between the fast roller and the slow roller, part of the wolf teeth on the fast roller at the shredding openings are staggered with part of the wolf teeth on the slow roller, the shredding openings are positioned at the bottom of the left side of the vibrating frame, a fast driving motor and a low-speed driving motor are arranged on the processing box, the fast driving motor is connected with the fast roller through belt transmission, and the low-speed driving motor is connected with the slow roller through belt transmission;
the gas filtering and recycling device comprises a spray tower, an electrostatic dust collection box and a gas collection tank; the top of the spray tower is communicated with the top of a pyrolysis cavity of the pyrolysis furnace through a first air pipe, an air pump is arranged on the first air pipe, the bottom of the spray tower is connected with an electrostatic dust collection box through a second air pipe, the electrostatic dust collection box is connected with a gas collection tank through a third air pipe, the gas collection tank is connected with a heating cavity of the pyrolysis furnace through a fourth air pipe, and a valve body is arranged on the fourth air pipe;
the solid-liquid separation equipment comprises a vertical pipeline, an inclined pipeline, an outer supporting cylinder, an inner extruding cylinder, a spiral extruding mechanism and a spiral material guiding mechanism, wherein the vertical pipeline is fixed at the bottom of the pyrolysis furnace, the upper end of the vertical pipeline is communicated with a pyrolysis cavity of the pyrolysis furnace, the outer supporting cylinder is horizontally arranged, one end of the inclined pipeline is connected with the lower end of the vertical pipeline, the other end of the inclined pipeline is connected with the right end of the outer supporting cylinder, the inner extruding cylinder is coaxially arranged in the outer supporting cylinder through a bracket, the spiral material guiding mechanism comprises a speed reducing motor and a material guiding rotating shaft, the material guiding rotating shaft is coaxially and rotatably connected in the vertical pipeline, a material guiding spiral blade is arranged on the material guiding rotating shaft, the upper end of the material guiding rotating shaft stretches into the pyrolysis cavity of the pyrolysis furnace, the lower end of the material guiding rotating shaft stretches out of the lower end face of the vertical pipeline and then is connected with a driven bevel gear, the speed reducing motor is fixed on the ground, a main shaft of the speed reducing motor is connected with a driving bevel gear, and the driving bevel gear is meshed with the driven bevel gear; the spiral extrusion mechanism comprises a variable frequency motor, a coke collecting box, a liquid collecting tank and a variable diameter rotating shaft, wherein the variable diameter rotating shaft is coaxially and rotatably connected in the inner extrusion cylinder, a plurality of through holes are formed in the cylinder wall of the inner extrusion cylinder, and a layer of filter cloth is arranged on the inner side of the cylinder wall of the inner extrusion cylinder; the radius of the variable-diameter rotating shaft gradually decreases from left to right, an extrusion spiral blade is arranged on the variable-diameter rotating shaft, the left end part of the variable-diameter rotating shaft extends out of the inner extrusion cylinder and is positioned in the outer supporting cylinder, a driven sprocket is arranged at the left end of the variable-diameter rotating shaft, a variable-frequency motor is fixed at the left end part of the outer supporting cylinder, a driving sprocket is arranged on a main shaft of the variable-frequency motor, and the driving sprocket is in transmission connection with the driven sprocket through a chain; the left end parts of the inner extrusion cylinder and the outer support cylinder are correspondingly provided with a discharge hole, the coke collecting box is connected with the discharge hole through a coke collecting pipeline, and the liquid collecting tank is connected with the outer support cylinder through a liquid collecting pipeline.
2. The domestic waste low temperature pyrolysis treatment system according to claim 1, wherein: the specific gravity winnowing machine comprises a bottom frame and two groups of air quantity adjusting devices, wherein the bottom frame is fixed at the top of the treatment box through bolts, the two groups of air quantity adjusting devices are arranged side by side up and down, one group of air quantity adjusting devices is fixed on the bottom frame, and the two groups of air quantity adjusting devices are connected through an H-shaped connecting frame; and the treatment box is also provided with a screening fan which is respectively connected with the two groups of air quantity adjusting devices through high-pressure hoses.
3. The domestic waste low temperature pyrolysis treatment system according to claim 2, wherein: the air quantity adjusting device comprises a stepping motor, an inner cylinder body and an outer cylinder body, wherein the central line of the inner cylinder body is arranged in the front-rear horizontal direction, the outer cylinder body is sleeved on the periphery of the inner cylinder body and is opened in the front-rear direction, the left side of the outer cylinder body is provided with an outer long hole in the direction of a bus, the left side of the inner cylinder body is provided with an inner long hole in the direction of the bus, the inner long hole and the outer long hole are communicated to form an air outlet channel, a main chain wheel is arranged on a main shaft of the stepping motor, and a secondary chain wheel is arranged at the center of the rear side of the inner cylinder body and is connected with the secondary chain wheel through a chain; the screening fan is connected with the front side of the inner cylinder body through the high-pressure hose.
4. The domestic waste low temperature pyrolysis treatment system according to claim 1, wherein: the upper surface of the left side of the guide plate is provided with an elastic buffer cushion.
5. The domestic waste low temperature pyrolysis treatment system according to claim 1, wherein: the waste heat recovery device comprises a heat exchange cylinder and a purifying tank, wherein the heat exchange cylinder is fixed on a second mounting platform, the central line of the heat exchange cylinder is arranged along the vertical direction, the top of the heat exchange cylinder is communicated with the inner cavity of the heat preservation conveying box through a waste heat pipeline, the bottom of the heat exchange cylinder is connected with a blower, a coil pipe is arranged in the heat exchange cylinder, the lower end part of the coil pipe is connected with the purifying tank, purifying solution is contained in the purifying tank, the top of the purifying tank is connected with an exhaust pipeline, the upper end part of the coil pipe is connected with the heating cavity of the pyrolysis furnace through a heat exchange pipeline, and a pipeline fan is arranged on the heat exchange pipeline.
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