CN211625260U

CN211625260U - System for treating solid waste

Info

Publication number: CN211625260U
Application number: CN202020111421.2U
Authority: CN
Inventors: 刘维娜; 刘涛; 兰玉顺; 武振恒
Original assignee: Beijing Yunshui Haorui Environmental Technology Co ltd
Current assignee: Beijing Yunshui Haorui Environmental Technology Co ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-10-02
Anticipated expiration: 2030-01-17

Abstract

The utility model discloses a system for handle solid waste, including pretreatment unit, drying unit, pyrolysis unit, clarifier, combustor and screening unit, the pyrolysis unit includes: the inner cylinder body is rotatably arranged, a pyrolysis space is formed in the inner cylinder body, a helical blade is arranged on the inner wall of the inner cylinder body, a dry material inlet is formed in the front end of the inner cylinder body, and a solid material outlet is formed in the rear end of the inner cylinder body; the secondary outer cylinder body is sleeved on the inner cylinder body and forms a gasification space, the gasification space is provided with a pyrolysis oil-gas pipeline and an atomized water pipeline, one end of the pyrolysis oil-gas pipeline is communicated with the pyrolysis space, the other end of the pyrolysis oil-gas pipeline extends in the gasification space, and a gasified gas outlet is formed in the secondary outer cylinder body far away from the other end of the pyrolysis oil-gas pipeline; the outer cylinder body is sleeved on the secondary outer cylinder body and forms a heat exchange space, the heat exchange space is provided with a high-temperature flue gas inlet and a heat exchange flue gas outlet, and the heat exchange flue gas outlet and the dry cold air outlet are connected with the dry hot air inlet.

Description

System for treating solid waste

Technical Field

The utility model belongs to the technical field of solid useless utilization, concretely relates to system for handle solid waste.

Background

The method for preparing the pyrolytic carbon from the municipal solid waste by anaerobic high-temperature pyrolysis has good effects on the aspects of reduction, harmlessness, recycling and the like, and is considered to be a promising municipal solid waste disposal mode. The biochar generated by pyrolysis has the advantages of large specific surface area, large porosity and the like, is a relatively excellent building material and soil conditioner, and has wide application prospect. However, the utilization mode of pyrolysis oil gas is relatively complex, and currently, the following are commonly used: (1) directly feeding the materials into a combustor for combustion after discharging the materials out of the furnace to generate flue gas, and reusing the flue gas into a system; (2) after the fuel is taken out of the furnace, the fuel is washed and purified by a water washing tower and then is subjected to oil-water separation to prepare clean fuel and chemicals. However, the current utilization method still has a certain technical barrier in the industrial application process, such as: (1) tar condensation easily occurs in the direct recycling process, and pipelines and burners are blocked, so that the combustion process is unstable; (2) the oil gas is directly burned back, the components such as Cl, heavy metals and the like in the pyrolysis gas are not removed, and harmful substances such as dioxin and the like are still generated in the combustion process; (3) after being washed by water, the coal is combusted or other chemicals are prepared, the added value is high, but a large amount of dust-containing oily wastewater is generated, and the problems of difficult oil-water separation, difficult tar recycling and the like exist.

Thus, the existing solid waste pyrolysis technology is in need of improvement.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, an object of the utility model is to provide a system for handle solid waste adopts this system not only to effectively solve the current solid useless processing in-process pyrolysis stage pyrolysis oil gas derivation and leads to the pipeline coking and directly burn to produce noxious material such as dioxin or the washing leads to the big problem of the oily waste water degree of difficulty, realizes the organic utilization of solid useless moreover, reduce cost.

In one aspect of the present invention, the present invention provides a system for treating solid waste. According to the utility model discloses an embodiment, the system includes:

a pretreatment unit having a solid waste inlet, an inorganic material outlet, and an organic material outlet;

the drying unit is provided with an organic material inlet, a drying hot air inlet, a drying material outlet and a drying cold air outlet, and the organic material inlet is connected with the organic material outlet;

a pyrolysis unit comprising:

the inner cylinder body is rotatably arranged, a pyrolysis space is formed in the inner cylinder body, the inner wall of the inner cylinder body is provided with a helical blade, the front end of the inner cylinder body is provided with a dry material inlet, the dry material inlet is connected with the dry material outlet through a feeding screw, and the rear end of the inner cylinder body is provided with a solid material outlet;

the secondary outer cylinder body is sleeved on the inner cylinder body, a gasification space is formed between the inner cylinder body and the secondary outer cylinder body, the gasification space is provided with a pyrolysis oil-gas pipeline and an atomized water pipeline, carrier gas in the atomized water pipeline is oxygen-enriched gas, one end of the pyrolysis oil-gas pipeline is communicated with the pyrolysis space, the other end of the pyrolysis oil-gas pipeline extends in the gasification space, the other end of the pyrolysis oil-gas pipeline is close to a gas outlet in the atomized water pipeline, and a gasified gas outlet is formed in the secondary outer cylinder body far away from the other end of the pyrolysis oil-gas pipeline;

the outer cylinder body is sleeved on the secondary outer cylinder body, a heat exchange space is formed between the secondary outer cylinder body and the outer cylinder body, the heat exchange space is provided with a high-temperature flue gas inlet and a heat exchange flue gas outlet, and the heat exchange flue gas outlet and the drying cold air outlet are connected with the drying hot air inlet;

the purifier is provided with a gasified gas inlet and a purified gas outlet, and the gasified gas inlet is connected with the gasified gas outlet;

the combustor is provided with a purified gas inlet, a primary air inlet, a natural gas inlet and a combustion flue gas outlet, the purified gas inlet is connected with the purified gas outlet, and the combustion flue gas outlet and the heat exchange flue gas outlet are connected with the high-temperature flue gas inlet;

the screening device is provided with a solid material inlet, a pyrolytic carbon outlet and a solid waste outlet, wherein the solid material inlet is connected with the solid material outlet through a spiral discharging machine provided with a cooling jacket.

According to the system for processing solid waste provided by the embodiment of the utility model, the solid waste is supplied to the pretreatment unit to remove the materials which are caused by the winding/blocking of the screw conveyer, such as large metal, and the obtained organic materials are dried by the drying unit and then are sent into the inner cylinder of the pyrolysis unit to be pyrolyzed, the dried materials in the inner cylinder are rolled along with the rotation of the inner cylinder, so that the heated surface of the materials is uniform, meanwhile, the helical blades on the inner wall of the inner cylinder continuously push the materials in the inner cylinder to move forwards, and the pyrolysis oil-water pipeline and the atomized-water pipeline are arranged in the gasification space formed by the inner cylinder and the outer cylinder by sleeving the secondary outer cylinder on the inner cylinder, the carrier gas in the atomized-water pipeline is oxygen-enriched gas, one end of the pyrolysis oil-water pipeline is communicated with the pyrolysis space in the inner cylinder, the other end extends in the gasification space, and the other end of, the pyrolysis oil gas generated by pyrolysis of the inner cylinder of the pyrolysis unit is guided into a gasification space through a pyrolysis oil gas pipeline, tar in the gasification space is mixed with atomized water and oxygen-enriched gas to be gasified to generate gasified gas mainly comprising combustible gas, the outer cylinder is sleeved on the secondary outer cylinder, a heat exchange space is formed between the secondary outer cylinder and the outer cylinder, high-temperature flue gas is supplied into the heat exchange space to provide a heat source for the gasification space and the pyrolysis space on the pyrolysis unit, part of the heat exchange flue gas and dry cold air obtained after heat exchange are distributed and then supplied to the drying unit to be used as dry hot air, and the problems that the pyrolysis oil gas is guided out in the pyrolysis process in the prior art to be condensed to block the pipeline and a burner, the pyrolysis oil gas is burned after being washed with water or other chemicals to generate a large amount of oily wastewater are solved, and the gasified gas generated in the gasification space of the pyrolysis unit is purified by a purifier and then supplied to the burner to be mixed with primary air and natural gas to be After burning, supply with the heating space of pyrolysis unit as high temperature flue gas use after partly air distribution of heat transfer flue gas, avoided among the prior art with pyrolysis production pyrolysis oil gas direct combustion production contain harmful substance such as dioxin, the solid-state material that contains the pyrolytic carbon that obtains in the pyrolysis unit inner tube body can separate through screening processing and obtain the pyrolytic carbon in addition, this pyrolytic carbon can regard as uses such as soil amendment, improves economic benefits. Therefore, the system not only effectively solves the problems that pyrolysis oil gas is led out in the pyrolysis stage in the existing solid waste treatment process to cause pipeline coking and toxic substances such as dioxin are generated by direct combustion or the difficulty of oily wastewater is large due to water washing, but also realizes the resource utilization of organic solid waste and reduces the cost.

In addition, the system for processing solid waste according to the above embodiment of the present invention may further have the following additional technical features:

preferably, the pyrolysis oil gas pipeline follows the length direction of interior barrel extends, and the one end of pyrolysis oil gas pipeline is close to the front end of interior barrel, the other end of pyrolysis oil gas pipeline is close to the rear end of interior barrel, the gasification gas outlet is close to the front end of interior barrel arranges. Therefore, the retention time of the gasified gas in the gasification space can be prolonged, and the gasification and heat exchange efficiency is improved.

Preferably, above-mentioned pyrolysis unit includes many pyrolysis oil gas pipeline and many the atomized water pipeline, many pyrolysis oil gas pipelines are followed the circumference interval arrangement of the periphery wall of interior barrel, many atomized water pipelines are followed the circumference interval arrangement of the periphery wall of interior barrel.

Preferably, a plurality of openings are formed in the other end of the pyrolysis oil-gas pipeline, and a plurality of openings are formed in the position of the gas outlet of the atomized water pipeline. Therefore, the pyrolysis oil gas can be improved and the full combustion of the pyrolysis oil gas can be realized.

Preferably, a baffle plate is arranged in the heat exchange space and/or the gasification space. Therefore, the heat exchange efficiency of the combustion flue gas can be improved.

Preferably, the system further comprises: the tail gas purification unit has dry cold wind entry and tail gas export up to standard, dry cold wind entry with dry cold wind export links to each other.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of a system for treating solid waste according to one embodiment of the present invention;

FIG. 2 is a schematic view of a longitudinal cross-sectional structure of a pyrolysis unit in a system for treating solid waste according to an embodiment of the present invention;

fig. 3 is a schematic view of a system for treating solid waste according to another embodiment of the present invention;

fig. 4 is a schematic flow chart of a method for processing solid waste according to a system for processing solid waste according to another embodiment of the present invention;

fig. 5 is a schematic flow chart of a method for processing solid waste according to a system for processing solid waste according to another embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In one aspect of the present invention, the present invention provides a system for treating solid waste. According to an embodiment of the present invention, referring to fig. 1-3, the system comprises: a pretreatment unit 100, a drying unit 200, a pyrolysis unit 300, a purified gas 400, a burner 500, and a sieving device 600.

According to an embodiment of the present invention, referring to fig. 1, the pretreatment unit 100 has a solid waste inlet 101, an inorganic material outlet 102 and an organic material outlet 103, and is adapted to pretreat the solid waste, and separate the solid waste into inorganic material and organic material. Specifically, the solid waste comprises sludge, garbage oversize products, waste tires, waste plastics, agricultural and forestry wastes, biogas residues and other solid waste rich in organic matters, and the pretreatment unit mainly aims at crushing or molding the materials according to the properties of the materials and removing large metal and other inorganic materials which can cause winding/blocking of a screw conveyor; meanwhile, with the progress of garbage classification, materials with high calorific value and materials with low calorific value can be reasonably proportioned, so that the calorific value of the materials is balanced with the energy required by the system (calculated according to the calorific value of the actual materials and the system).

According to the utility model discloses an embodiment, referring to fig. 1, drying unit 200 has organic material entry 201, dry hot-blast entry 202, dry material export 203 and dry cold wind export 204, and organic material entry 201 links to each other with organic material export 103, and is suitable for the organic material and the hot-blast heat transfer of drying that obtain with the aforesaid, obtains dry material and dry cold wind. Specifically, the organic material and the dry hot air can be indirectly or directly contacted for heat exchange, the temperature in the drying unit is maintained at 200-250 ℃, the organic material stays in the drying unit for 40-90 min, and the water content of the obtained dry material is not higher than 20 wt%.

According to an embodiment of the present invention, referring to fig. 1 and 2, the pyrolysis unit 300 includes an inner cylinder 31, a sub-outer cylinder 32, and an outer cylinder 33.

According to the utility model discloses a specific embodiment, refer to fig. 2, interior barrel 31 is along the rotatable setting of horizontal direction, form pyrolysis space 34 in the interior barrel 31, and interior barrel 31 inner wall is equipped with helical blade 311, along with the rotation of interior barrel 31, dry material rolls in interior barrel 31, this helical blade 311 impels the dry material that gets into in pyrolysis space 33 to move ahead, and the front end of interior barrel 31 is equipped with dry material entry 301, dry material entry 301 links to each other with dry material export 203 through the feeding spiral (not shown), the rear end of interior barrel 31 is equipped with solid-state material export 302.

According to another embodiment of the present invention, referring to fig. 1 and 2, the secondary outer cylinder 32 is sleeved on the inner cylinder 31, and a gasification space 35 is formed between the inner cylinder 31 and the secondary outer cylinder 32, the gasification space 35 is provided with a pyrolysis oil-gas pipeline 36 and an atomized-water pipeline 37, the carrier gas in the atomized-water pipeline 37 is oxygen-rich gas, one end 361 of the pyrolysis oil-gas pipeline 36 is communicated with the pyrolysis space 34, the other end 362 of the pyrolysis oil-gas pipeline 36 extends in the gasification space 35, and the other end of the pyrolysis oil-gas pipeline 36 is close to the gas outlet on the atomized-water pipeline 37, that is, the pyrolysis oil-gas generated in the pyrolysis space 34 is directly introduced into the gasification space 35 through the pyrolysis oil-gas pipeline 36, so that tar in the pyrolysis oil-gas and atomized water and oxygen supplied through the atomized-water pipeline 37 undergo a gasification reaction to generate gasified gas mainly including combustible gas, and simultaneously, a gasified gas outlet 303 is provided on the secondary outer cylinder 32 far away, thereby improving the retention time of the gasified gas in the gasification space and improving the gasification and heat exchange efficiency.

Further, referring to fig. 2, the pyrolysis oil and gas pipeline 36 extends along the length direction of the inner cylinder 31, one end 361 of the pyrolysis oil and gas pipeline 36 is close to the front end of the inner cylinder 31, and the other end 362 of the pyrolysis oil and gas pipeline 36 is close to the rear end of the inner cylinder 31, that is, pyrolysis oil and gas generated in the pyrolysis space 34 is discharged by being close to the front end of the inner cylinder 31 and then is supplied to the gasification space 35 through the pyrolysis oil and gas pipeline 36, and the gasified gas outlet 303 is arranged close to the front end of the inner cylinder 31, so that the retention time of the gasified gas in the gasification space 35 can be prolonged, and the gasification and heat exchange efficiency can be improved. Preferably, a plurality of pyrolysis oil gas pipelines 36 and an atomized water pipeline 37 can be arranged in the gasification space 35, the plurality of pyrolysis oil gas pipelines 36 are arranged at intervals along the circumferential direction of the outer circumferential wall of the inner cylinder 31, the plurality of atomized water pipelines 37 are arranged at intervals along the circumferential direction of the outer circumferential wall of the inner cylinder 31, wherein the number of the pyrolysis oil gas pipelines 36 and the number of the atomized water pipelines 37 can be in one-to-one correspondence, or one atomized water pipeline 37 or one pyrolysis oil gas pipeline 36 is correspondingly arranged in a plurality of atomized water pipelines 37, and a person skilled in the art can select the atomized water pipelines according to actual needs. Furthermore, in order to sufficiently gasify the oil and gas supplied to the gasification space through the pyrolysis oil and gas pipeline 36, a plurality of openings 363 are provided at the other end 362 of the pyrolysis oil and gas pipeline 36, that is, the pyrolysis oil and gas supplied through the pyrolysis oil and gas pipeline 36 is sprayed through the plurality of openings 363 and then mixed with the atomized water and the oxygen to be gasified. Meanwhile, in order to further improve the gasification and heat exchange efficiency of tar, atomized water and oxygen in the pyrolysis oil gas, a baffle plate (not shown) is preferably arranged in the gasification space 35, the baffle plate can improve the retention time of the gasified gas in the gasification space 35, and meanwhile, the turbulent flow effect of the gasified gas can be realized to achieve the purpose of turbulent flow, so that the heat exchange efficiency of the inner cylinder is improved. It should be noted that, the skilled person in the art can select pyrolysis oil gas pipeline 36 and atomized water pipeline 37's number according to actual need, as long as can realize gasification efficiency and interior barrel 31 thermally equivalent in gasification space 35 can, simultaneously this application is equipped with a plurality of trompils sizes on pyrolysis oil gas pipeline 36's the other end 362 and does not have special restrictions, as long as can guarantee through pyrolysis oil gas 36 supply in the pyrolysis oil gas tar with atomized water and oxygen fully gasify can, in addition this application also does not have strict restrictions to the concrete type of baffling board in gasification space 35, as long as can realize above-mentioned dwell time that improves the gasification gas in gasification space 35, can realize simultaneously that gasification gas vortex effect can.

According to the utility model discloses a still another embodiment, refer to fig. 1 and 2, outer barrel 33 cover is established on inferior outer barrel 32, and form heat transfer space 38 between inferior outer barrel 32 and the outer barrel 33, heat transfer space 38 is equipped with high temperature flue gas entry 304 and heat transfer exhanst gas outlet 305, heat transfer exhanst gas outlet 305 and dry cold wind export 204 link to each other with dry hot wind entry 202, supply with high temperature flue gas in heat transfer space 38 promptly and time outer barrel 32 heat transfer for gasification space 35 heat supply, supply with to drying unit 200 after partly air distribution of the partly of the heat transfer flue gas that obtains and dry cold wind and use as dry hot wind. The inventor discovers that this application is through improving current pyrolysis unit for the direct pipe way of pyrolysis oil gas that interior barrel pyrolysis produced supplies to gasification space, supplies with high temperature flue gas for gasification space and pyrolysis space heat supply in to the heat transfer space simultaneously, has solved prior art pyrolysis process and has derived pyrolysis oil gas and appear tar and condense and block up pipeline and combustor and wash the postcombustion or make other chemicals behind the pyrolysis oil gas water and produce the big problem of a large amount of oily waste water treatment degree of difficulty.

Further, simultaneously, in order to further improve the heat exchange efficiency of high temperature flue gas and secondary shell layer 32 in heat exchange space 38, it is preferable to set up baffling board (not shown) in heat exchange space 38, and this baffling board can improve the dwell time in high temperature flue gas and the gasification space, can realize the vortex effect of high temperature flue gas in the heat exchange space simultaneously and reach the purpose of torrent, improves heat exchange efficiency. It should be noted that, this application also does not have strict restriction to the concrete type of folded plate, as long as can realize above-mentioned dwell time who improves high temperature flue gas in the heat transfer space, can realize simultaneously in the heat transfer space high temperature flue gas vortex effect can.

According to the embodiment of the utility model, the clarifier 400 is equipped with gasified gas entry 401 and purified gas export 402, and gasified gas entry 401 links to each other with gasified gas export 303, and is suitable for the gasified gas that produces in the gasification space 35 with pyrolysis unit 300 and carries out purification treatment, gets rid of HCl, H in the gasified gas₂S and heavy metals and other impurities, thereby avoiding generating harmful substances such as dioxin and the like in the combustion process of the gasified gas. It should be noted that those skilled in the art can select the cleaning gas according to actual needs as long as harmful substances such as dioxin generated by combustion of the cleaning gas can be avoided.

According to the utility model discloses an embodiment, combustor 500 has the clean gas entry 501, the wind entry 502, natural gas entry 503 and burning exhanst gas outlet 504, clean gas entry 501 links to each other with clean gas outlet 402, burning exhanst gas outlet 504 and heat transfer exhanst gas outlet 305 link to each other with high temperature exhanst gas entry 304, and be suitable for supplying the clean gas that obtains to combustor 500 and wind and natural gas mixed combustion above-mentioned, obtain the burning flue gas, and return pyrolysis unit 300's heat transfer space 38 as the high temperature flue gas use after distributing wind with another part of burning flue gas and heat transfer flue gas.

According to the embodiment of the utility model, referring to fig. 1, screening plant 600 has solid-state material entry 601, pyrolytic carbon export 602 and solid useless export 603, and solid-state material entry 601 links to each other through the spiral discharging machine (not shown) that is equipped with the cooling jacket with solid-state material export 302, and is suitable for the solid-state material that contains pyrolytic carbon that obtains pyrolytic unit 300 to sieve and handle, so that the separation obtains pyrolytic carbon and contains the solid useless of glass, fragment of brick and metal etc. admittedly, and the pyrolytic carbon that this solid-state material obtained after sieving can be regarded as soil amendment and use. It should be noted that, the specific type of the sieving device can be selected by those skilled in the art according to actual needs, as long as the separation of the pyrolytic carbon can be realized.

Further, referring to fig. 3, the system further includes: the tail gas dust removal unit 700.

According to the utility model discloses an embodiment, tail gas dust removal unit 700 has dry cold wind entry 701 and tail gas export 702 up to standard, and dry cold wind entry 701 links to each other with dry cold wind export 204, and is suitable for another part of the dry cold wind that obtains with the aforesaid to purify and remove dust to realize tail gas emission up to standard. Specifically, the tail gas dust removal unit comprises a cyclone dust collector, a water washing tower, an alkaline washing tower, a deodorizing device, an active carbon adsorption device and the like, and technical personnel in the field can select the tail gas dust removal unit according to actual needs as long as the tail gas dust removal unit can achieve standard emission of the tail gas.

As described above, the system for treating solid waste according to the embodiment of the present invention has at least one of the following advantages:

(1) according to the pyrolysis unit, the pyrolysis oil gas pipeline and the atomized water pipeline are arranged in the gasification space ring between the inner barrel and the secondary outer barrel of the pyrolysis unit, so that pyrolysis oil gas generated in the pyrolysis space is directly conveyed into the gasification space, the pyrolysis oil gas is always in a high-temperature environment, and coking and blockage of the pyrolysis oil gas conveying pipeline are avoided;

(2) according to the device, the pyrolysis oil-gas pipeline is led out from the side close to the front end of the inner cylinder and is uniformly released from the side close to the rear end of the inner cylinder, and the gasified gas is pumped out from the position, close to the front end of the inner cylinder, of the opposite side, so that the gasification time of the pyrolysis oil-gas is prolonged, and the pyrolysis oil-gas is ensured to be fully reacted;

(3) the application carries out the burning with the gasification gas after purifying, has reduced HCl, H in the gasification gas₂S, heavy metals and other impurities reduce the generation of toxic and harmful substances such as dioxin and the like in principle, and the tail gas is simple to treat;

(4) the barrel constantly rotates in this application pyrolysis unit, and the material is rotatory and constantly receives the hot side to replace along with the helical blade that sets up on the inner cylinder wall, is heated evenly, and the pyrolysis is effectual.

For ease of understanding, the method of treating solid waste using the above system is described in detail below. According to an embodiment of the present invention, referring to fig. 4 and 5, the method includes:

s100: feeding the solid waste into a pretreatment unit for pretreatment

In this step, the solid waste is fed to a pretreatment unit for pretreatment to obtain inorganic materials and organic materials. Specifically, the solid waste comprises sludge, garbage oversize products, waste tires, waste plastics, agricultural and forestry wastes, biogas residues and other solid waste rich in organic matters, and the pretreatment unit mainly aims at crushing or molding the materials according to the properties of the materials and removing large metal and other inorganic materials which can cause winding/blocking of a screw conveyor; meanwhile, with the progress of garbage classification, materials with high calorific value and materials with low calorific value can be reasonably proportioned, so that the calorific value of the materials is balanced with the energy required by the system (calculated according to the calorific value of the actual materials and the system).

S200: organic materials are supplied to a drying unit to exchange heat with drying hot air

In the step, the obtained organic material is supplied to a drying unit to exchange heat with dry hot air so as to obtain a dry material and dry cold air. Specifically, the organic material and the dry hot air can be indirectly or directly contacted for heat exchange, the temperature in the drying unit is maintained at 200-250 ℃, the organic material stays in the drying unit for 40-90 min, and the water content of the obtained dry material is not higher than 20 wt%.

S300: the dry materials are supplied to the inner cylinder body of the pyrolysis unit through the feeding screw to carry out pyrolysis reaction, the obtained pyrolysis oil gas is supplied to the gasification space through the pyrolysis oil gas pipeline to be mixed with oxygen-enriched atomized water, meanwhile, high-temperature flue gas is supplied to the heat exchange space, and after part of the heat exchange flue gas and part of the dry cold air are distributed, the heat exchange flue gas returns to the step S200

In the step, dry materials are supplied to an inner cylinder body of a pyrolysis unit through a feeding screw to carry out pyrolysis reaction, obtained pyrolysis oil gas is supplied to a gasification space through a pyrolysis oil gas pipeline to be mixed with oxygen-enriched atomized water, high-temperature flue gas is supplied to a heat exchange space, heat is supplied to the pyrolysis space and the gasification space, solid materials, the gasified gas and the heat exchange flue gas are obtained, and part of the heat exchange flue gas and part of dry cold air are distributed and then returned to the step S200 to be used as dry hot air. The inventor discovers that this application is through improving current pyrolysis unit for the direct pipe way of pyrolysis oil gas that interior barrel pyrolysis produced supplies to gasification space, supplies with high temperature flue gas for gasification space and pyrolysis space heat supply in to the heat transfer space simultaneously, has solved prior art pyrolysis process and has derived pyrolysis oil gas and appear tar and condense and block up pipeline and combustor and wash the postcombustion or make other chemicals behind the pyrolysis oil gas water and produce the big problem of a large amount of oily waste water treatment degree of difficulty.

S400: the gasified gas is supplied to a purifier for purification treatment

In the step, the obtained gasified gas is supplied to a purifier for purification treatment to remove HCl and H in the gasified gas₂S and heavy metals and the likeThereby avoiding generating harmful substances such as dioxin and the like in the combustion process of the gasified gas. It should be noted that those skilled in the art can select the cleaning gas according to actual needs as long as harmful substances such as dioxin generated by combustion of the cleaning gas can be avoided.

S500: supplying the purified gas to the combustor to be mixed and combusted with the primary air and the natural gas, distributing air to the combustion flue gas and the other part of the heat exchange flue gas, and returning to the step S300

In this step, the purified gas obtained above is supplied to a burner to be mixed and burned with primary air and natural gas, so as to obtain combustion flue gas, and the combustion flue gas and the other part of the heat exchange flue gas are air-distributed and then returned to the heat exchange space of step S300 to be used as high-temperature flue gas.

S600: feeding solid materials to a screening device through a spiral discharging machine provided with a cooling jacket for screening treatment

In the step, the solid material obtained in the pyrolysis process is supplied to a screening device through a spiral discharging machine provided with a cooling jacket for screening treatment, so that pyrolytic carbon and solid wastes containing glass, bricks, metal and the like are obtained, and the pyrolytic carbon obtained after screening the solid material can be used as a soil conditioner. It should be noted that, the specific type of the sieving device can be selected by those skilled in the art according to actual needs, as long as the separation of the pyrolytic carbon can be realized.

According to the method for processing solid waste provided by the embodiment of the utility model, the solid waste is supplied to the pretreatment unit to remove the materials which are wound/stuck by the screw conveyer and caused by large metal blocks, and the obtained organic materials are dried by the drying unit and then are sent into the inner barrel of the pyrolysis unit to be pyrolyzed, the dried materials in the inner barrel are rolled along with the rotation of the inner barrel, so that the heated surface of the materials is uniform, meanwhile, the helical blades on the inner wall of the inner barrel continuously push the materials in the inner barrel to move forwards, and the pyrolysis oil-water pipeline and the atomized-water pipeline are arranged in the gasification space formed by the inner barrel and the outer barrel by sleeving the secondary outer barrel on the inner barrel, the carrier gas in the atomized-water pipeline is oxygen-enriched gas, one end of the pyrolysis oil-water pipeline is communicated with the pyrolysis space in the inner barrel, the other end extends in the gasification space, and the other end on the pyrolysis, the pyrolysis oil gas generated by pyrolysis of the inner cylinder of the pyrolysis unit is guided into a gasification space through a pyrolysis oil gas pipeline, tar in the gasification space is mixed with atomized water and oxygen-enriched gas to be gasified to generate gasified gas mainly comprising combustible gas, the outer cylinder is sleeved on the secondary outer cylinder, a heat exchange space is formed between the secondary outer cylinder and the outer cylinder, high-temperature flue gas is supplied into the heat exchange space to provide a heat source for the gasification space and the pyrolysis space on the pyrolysis unit, part of the heat exchange flue gas and dry cold air obtained after heat exchange are distributed and then supplied to the drying unit to be used as dry hot air, and the problems that the pyrolysis oil gas is guided out in the pyrolysis process in the prior art to be condensed to block the pipeline and a burner, the pyrolysis oil gas is burned after being washed with water or other chemicals to generate a large amount of oily wastewater are solved, and the gasified gas generated in the gasification space of the pyrolysis unit is purified by a purifier and then supplied to the burner to be mixed with primary air and natural gas to be After burning, supply with the heating space of pyrolysis unit as high temperature flue gas use after partly air distribution of heat transfer flue gas, avoided among the prior art with pyrolysis production pyrolysis oil gas direct combustion production contain harmful substance such as dioxin, the solid-state material that contains the pyrolytic carbon that obtains in the pyrolysis unit inner tube body can separate through screening processing and obtain the pyrolytic carbon in addition, this pyrolytic carbon can regard as uses such as soil amendment, improves economic benefits. Therefore, the system not only effectively solves the problems that pyrolysis oil gas is led out in the pyrolysis stage in the existing solid waste treatment process to cause pipeline coking and toxic substances such as dioxin are generated by direct combustion or the difficulty of oily wastewater is large due to water washing, but also realizes the resource utilization of organic solid waste and reduces the cost.

Further, referring to fig. 5, the method further includes:

s700: supplying the other part of the dry cold air to a tail gas dust removal unit for purification treatment

In the step, the other part of the dry cold air is supplied to a tail gas dedusting unit for purification treatment so as to obtain the tail gas reaching the standard. Specifically, the tail gas dust removal unit comprises a cyclone dust collector, a water washing tower, an alkaline washing tower, a deodorizing device, an active carbon adsorption device and the like, and technical personnel in the field can select the tail gas dust removal unit according to actual needs as long as the tail gas dust removal unit can achieve standard emission of the tail gas.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. A system for treating solid waste, comprising:

a pyrolysis unit comprising:

2. The system for treating solid waste according to claim 1, wherein the pyrolysis oil and gas pipeline extends along a length direction of the inner cylinder, and one end of the pyrolysis oil and gas pipeline is close to a front end of the inner cylinder, the other end of the pyrolysis oil and gas pipeline is close to a rear end of the inner cylinder, and the gasified gas outlet is arranged close to the front end of the inner cylinder.

3. The system for processing solid waste of claim 2, comprising a plurality of pyrolysis oil and gas pipelines and a plurality of atomized water pipelines, wherein the plurality of pyrolysis oil and gas pipelines are arranged at intervals along the circumferential direction of the outer circumferential wall of the inner cylinder, and the plurality of atomized water pipelines are arranged at intervals along the circumferential direction of the outer circumferential wall of the inner cylinder.

4. The system for treating solid waste according to claim 1, wherein the pyrolysis oil gas pipeline is provided with a plurality of openings at the other end thereof, and the atomized water pipeline is provided with a plurality of openings at the position of the air outlet.

5. The system for processing solid waste of claim 1, wherein a baffle is disposed within the heat exchange space and/or the gasification space.

6. The system for processing solid waste of claim 1, further comprising:

the tail gas dust removal unit is provided with a dry cold air inlet and a standard tail gas outlet, and the dry cold air inlet is connected with the dry cold air outlet.