CN211625259U

CN211625259U - System for treating solid waste

Info

Publication number: CN211625259U
Application number: CN202020111262.6U
Authority: CN
Inventors: 刘维娜; 兰玉顺; 王超; 陈海洋
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, dry unit, pyrolysis unit and screening unit, the pyrolysis unit includes: the inner barrel is rotatably arranged, a pyrolysis space is formed in the inner barrel, a helical blade is arranged on the inner wall of the inner barrel, a dry material inlet is formed in the front end of the inner barrel, and a solid material outlet is formed in the rear end of the inner barrel; outer barrel cover establishes and forms combustion space on the barrel in, combustion space is equipped with the pyrolysis oil and gas pipeline, the one end and the pyrolysis space intercommunication of pyrolysis oil and gas pipeline, the other end of pyrolysis oil and gas pipeline extends in combustion space, be equipped with once wind entry and overgrate air entry on the outer barrel of the other end that is close to the pyrolysis oil and gas pipeline, the overgrate air entry staggers with the other end of pyrolysis oil and gas pipeline and arranges, be equipped with the heat transfer exhanst gas outlet on keeping away from the outer barrel of the other end of pyrolysis oil and gas pipeline, heat transfer exhanst gas outlet and dry cold wind export link to each other with dry hot-.

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 has good effects in the aspects of solid waste reduction, harmlessness, recycling and the like through anaerobic pyrolysis of the solid organic waste, and is considered to be a promising solid organic waste treatment 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. The utilization mode of pyrolysis oil gas is relatively complicated, and currently, the common use is as follows: (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) 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 effectively to have solved among the current solid useless processing procedure pyrolysis stage pyrolysis oil gas derivation and leads to the pipeline coking or the washing to lead to the big problem of the oily waste water degree of difficulty, realizes the organic solid useless utilization 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, a spiral blade is arranged on the inner wall of the inner cylinder body, a dried material inlet is formed in the front end of the inner cylinder body, the dried material inlet is connected with the dried material outlet through a feeding spiral, and a solid material outlet is formed in the rear end of the inner cylinder body;

the outer barrel is sleeved on the inner barrel, a combustion space is formed between the inner barrel and the outer barrel, a pyrolysis oil-gas pipeline is arranged in the combustion space, 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 combustion space, a primary air inlet and a secondary air inlet are formed in the outer barrel close to the other end of the pyrolysis oil-gas pipeline, the secondary air inlet and the other end of the pyrolysis oil-gas pipeline are arranged in a staggered mode, a heat exchange flue gas outlet is formed in the outer barrel far away from the other end of the pyrolysis oil-gas pipeline, and the heat exchange flue gas outlet and the dry cold air outlet are connected with the dry hot air 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 wound/stuck by the screw conveyer and caused by the large metal and the like, then 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 and gas pipeline is arranged in the combustion space formed between the inner cylinder and the outer cylinder by sleeving the outer cylinder on the inner cylinder, one end of the pyrolysis oil and gas pipeline is communicated with the pyrolysis space in the inner cylinder, the other end of the pyrolysis oil and gas pipeline extends in the combustion space, and the outer cylinder close to the other end of the pyrolysis, the pyrolysis oil gas generated by pyrolysis of the inner cylinder body of the pyrolysis unit is guided into a combustion space through the pyrolysis oil gas pipeline and is mixed and combusted with primary air, combustion smoke generated by combustion and secondary air are distributed to provide a heat source for pyrolysis reaction in the inner cylinder body, heat exchange smoke obtained after heat exchange and part of dry cold air are distributed to supply to the drying unit and are used as dry hot air, so that the problems that tar is condensed in the pyrolysis oil gas guiding-out process in the prior art to block the pipeline and a burner, the pyrolysis oil gas is washed and then combusted or other chemicals are produced to produce a large amount of oily wastewater, the difficulty is high are solved, solid materials containing the pyrolysis carbon obtained in the inner cylinder body of the pyrolysis unit can be separated through screening treatment to obtain the pyrolysis carbon, the pyrolysis carbon can be used as a soil conditioner and the like, and economic benefits are improved. Therefore, the system not only effectively solves the problem that the difficulty of oily wastewater is high due to pipeline coking or water washing caused by pyrolysis oil gas derivation in the pyrolysis stage in the existing solid waste treatment process, 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 heat transfer exhanst gas outlet is close to the front end of interior barrel arranges. Therefore, the residence time of the pyrolysis oil gas after combustion and the secondary air after air distribution in the combustion space can be prolonged, and the heat exchange efficiency is improved.

Preferably, above-mentioned pyrolysis unit includes many the pyrolysis oil gas pipeline, many pyrolysis oil gas pipelines follow the circumference interval arrangement of the periphery wall of interior barrel, and the other end extended position of pyrolysis oil gas pipeline is different. Therefore, the pyrolysis space in the inner cylinder body can be uniformly heated, and the pyrolysis efficiency is improved.

Preferably, the other end of the pyrolysis oil-gas pipeline is provided with a plurality of openings. Therefore, the full combustion of the pyrolysis oil gas can be realized.

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

Preferably, the system further comprises: the cyclone separator is provided with a dry cold air inlet, a separated cold air outlet and a particle outlet, the dry cold air inlet is connected with the dry cold air outlet, and the separated cold air outlet is connected with the secondary air inlet.

Preferably, the system further comprises: the tail gas purification unit is provided with a tail gas inlet and a tail gas outlet reaching the standard, and the tail gas inlet is connected with the separated cold air outlet.

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, and a screening device 400.

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 and an outer cylinder 32.

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 33 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 through feeding spiral (not shown) with dry material export 203, 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 outer cylinder 32 is sleeved on the inner cylinder 31, and a combustion space 34 is formed between the inner cylinder 31 and the outer cylinder 32, the combustion space 34 is provided with a pyrolysis oil and gas pipeline 35, one end 351 of the pyrolysis oil and gas pipeline 35 is communicated with the pyrolysis space 33, the other end 352 of the pyrolysis oil and gas pipeline 35 extends in the combustion space 34, that is, pyrolysis oil and gas generated in the pyrolysis space 33 is directly introduced into the combustion space 34 through the pyrolysis oil and gas pipeline 35, and the outer cylinder 32 near the other end 352 of the pyrolysis oil and gas pipeline 35 is provided with a primary air inlet 303 and a secondary air inlet 304, the secondary air inlet 304 and the other end 352 of the pyrolysis oil and gas pipeline 35 are arranged in a staggered manner, so as to prevent the blown secondary air from blowing out flame burning the pyrolysis oil and gas, the pyrolysis oil and gas to be introduced into the combustion space 34 is mixed with the, the obtained combustion flue gas is distributed with secondary air and then heated for the inner cylinder 31 to provide a heat source for pyrolysis of dried materials in the pyrolysis space 33 in the inner cylinder 31, the outer cylinder 32 at the other end 352 far away from the pyrolysis oil-gas pipeline 35 is provided with a heat exchange flue gas outlet 305, namely, the retention time of the combustion flue gas in the combustion space 34 is prolonged, the heat exchange efficiency is improved, the heat exchange flue gas obtained after heat exchange is discharged from the heat exchange flue gas outlet 305, the heat exchange flue gas outlet 305 and the dry cold air outlet 204 are connected with the dry hot air inlet 202, namely, the heat exchange flue gas after heat exchange and part of dry cold air obtained by the drying unit 200 are distributed with air and then supplied to the drying unit 200 to be used as dry hot air. The inventor discovers that this application is through improving current pyrolysis unit for the direct pipe-line of passing through of pyrolysis oil gas that interior barrel pyrolysis produced burns for interior barrel heat supply to combustion space, has not only reduced the reliance of pyrolysis unit to the external energy, has solved moreover prior art pyrolysis process and has derived the pyrolysis oil gas and appear tar and condense and block up pipeline and combustor and wash the pyrolysis oil gas postcombustion or make other chemicals and produce the big problem of a large amount of oily waste water treatment degree of difficulty.

Further, referring to fig. 2, the pyrolysis oil and gas pipeline 35 extends along the length direction of the inner cylinder 31, and one end 351 of the pyrolysis oil and gas pipeline 35 is close to the front end of the inner cylinder 31, and the heat exchange flue gas outlet 305 is close to the front end of the inner cylinder 31, that is, pyrolysis oil and gas generated in the pyrolysis space 33 is discharged by being close to the front end of the inner cylinder 31 and then is supplied to the combustion space 34 through the pyrolysis oil and gas pipeline 35, and the heat exchange flue gas outlet 305 is close to the front end of the inner cylinder 31 and arranged, so that the retention time of the combustion flue gas and secondary air in the combustion space after air distribution can be prolonged, and the heat exchange efficiency is improved. Preferably, a plurality of pyrolysis oil gas pipes 35 may be disposed in the combustion space 33, the plurality of pyrolysis oil gas pipes 35 are spaced apart along the circumferential direction of the outer circumferential wall of the inner cylinder 31, and the other end 352 of the pyrolysis oil gas pipe 35 extends at a different position, wherein, the number of the pyrolysis oil gas pipelines 35 can correspond to the number of the primary air inlets 303 one by one, or a plurality of pyrolysis oil gas pipelines 35 are correspondingly provided with a primary air inlet 303, similarly, the number of the secondary air inlets 304 can correspond to the number of the pyrolysis oil gas pipelines 35 one by one, or a plurality of pyrolysis oil gas pipelines 35 are correspondingly provided with a secondary air inlet 304, the selection of this field of technical personnel can be according to actual need, and preferred along the circumference of inner cylinder 31 periphery wall, the other end 352 extended position of pyrolysis oil gas pipeline 35 increases in proper order to guarantee that the inner cylinder is heated evenly, improve the interior heat exchange efficiency of inner tube. Furthermore, in order to fully burn the pyrolysis oil gas supplied through the pyrolysis oil gas pipeline 35, a plurality of openings (not shown) are provided at the other end 352 of the pyrolysis oil gas pipeline 35, that is, the pyrolysis oil gas supplied through the pyrolysis oil gas pipeline 35 is sprayed through the plurality of openings and then mixed with the primary air for burning. Meanwhile, in order to further improve the heat exchange efficiency between the combustion flue gas and the secondary air after air distribution and the inner cylinder 31, a baffle plate (not shown) is preferably arranged in the combustion space 34, and the baffle plate can improve the retention time of the combustion flue gas and the secondary air after air distribution in the combustion space, and can achieve the turbulent flow effect after the combustion flue gas and the secondary air are distributed in the combustion space to achieve the purpose of turbulent flow, so that the heat exchange efficiency is improved. It should be noted that, a person skilled in the art can select the number of the pyrolysis oil and gas pipelines 35 according to actual needs, as long as the inner cylinder 31 can be uniformly heated, meanwhile, the size of the plurality of openings on the other end 352 of the pyrolysis oil and gas pipeline 35 is not particularly limited, as long as the pyrolysis oil and gas supplied through the pyrolysis oil and gas pipeline 35 and the primary air can be sufficiently combusted, in addition, the specific type of the splitter plate is not strictly limited, as long as the residence time of the combustion flue gas and the secondary air in the combustion space after air distribution can be improved, and meanwhile, the turbulence effect after the combustion flue gas and the secondary air in the combustion space are distributed can be realized.

According to the embodiment of the utility model, referring to fig. 1, screening plant 400 has solid-state material entry 401, pyrolytic carbon export 402 and solid useless export 403, and solid-state material entry 401 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, the pyrolytic carbon that this solid-state material obtained after sieving can regard as soil amendment to 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: a cyclone 500 and a tail gas purification unit 600.

According to the embodiment of the utility model, cyclone 500 has dry cold wind entry 501, post-separation cold wind export 502 and granule export 503, and dry cold wind entry 501 links to each other with dry cold wind export 204, and post-separation cold wind export 502 links to each other with overgrate air entry 304, and is suitable for to carry out cyclone with another part of the dry cold wind that above-mentioned drying unit 200 obtained, separates and obtains granule and post-separation cold wind to partly supply with the pyrolysis unit 300 to use as the overgrate air with separating the back cold wind. Preferably, the cyclone separator is made of high-temperature resistant materials.

According to the utility model discloses an embodiment, tail gas purification unit 600 has tail gas entry 601 and tail gas export 602 up to standard, and tail gas entry 601 links to each other with separation back cold wind export 502, and is suitable for another part of the cold wind after the separation that obtains with the aforesaid to purify and remove dust to realize tail gas emission up to standard. Specifically, the tail gas purification 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 according to actual needs as long as the tail gas can be discharged up to the standard.

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 is arranged in the combustion space formed by the inner cylinder and the outer cylinder of the pyrolysis unit in an annular system, so that pyrolysis oil gas generated in the inner cylinder is directly combusted in the combustion space, and coking and blockage of a pyrolysis oil gas conveying pipeline are avoided;

(2 the pyrolysis oil gas pipelines in the combustion space are set to be different in length, so that pyrolysis oil gas is uniformly released along the rotation direction of the furnace body, and a primary air introducing system and a secondary air introducing system are independently arranged, so that the uniform temperature of the whole furnace body is ensured, the deformation or the tearing of a welding line of the furnace body caused by uneven temperature is reduced, and the service life of the pyrolysis furnace is prolonged;

(3) pyrolysis oil gas generated by pyrolysis is directly combusted in a combustion space outside the inner cylinder body, and the inner cylinder body is directly heated by heat after combustion, so that the heat utilization rate is high;

(4) the utility model provides a barrel constantly rotates in the pyrolysis unit, and the helical blade that arranges on the dry material inner wall along with interior barrel rotates and constantly receives the hot side to replace, 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 a combustion space through a pyrolysis oil gas pipeline, is combusted with primary air and then is distributed with secondary air to supply heat to the inner cylinder body, and the heat exchange smoke and part of dry cold air are distributed with air and then are returned to the step S200

In the step, the obtained dry material is supplied to an inner cylinder of a pyrolysis unit through a feeding screw to carry out pyrolysis reaction, the obtained pyrolysis oil gas is supplied to a combustion space through a pyrolysis oil gas pipeline, is combusted with primary air and then is distributed with secondary air to supply heat to the inner cylinder, the dry material is subjected to pyrolysis reaction in the inner cylinder to obtain a solid material, the combustion smoke in the combustion space and the secondary air are distributed with air and then are subjected to heat exchange with the inner cylinder to obtain heat exchange smoke, and the heat exchange smoke and part of the dry cold air are distributed with air and then are returned to the step S200 to be used as dry hot air. The inventor discovers, this application is through improving current pyrolysis unit for the pyrolysis oil gas that interior barrel pyrolysis produced is direct to be supplied with to combustion space through the pipeline and burns the back with the overgrate air distribution after for interior barrel heat supply, has not only reduced the reliance of pyrolysis unit to the external energy, has solved moreover that prior art pyrolysis process derives the pyrolysis oil gas and has appeared tar condensation and block up pipeline and combustor and with the pyrolysis oil gas washing after the reburning or make other chemicals produce the big problem of the oily waste water treatment degree of difficulty in a large number.

S400: 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 the large metal and the like, then 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 and gas pipeline is arranged in the combustion space formed between the inner cylinder and the outer cylinder by sleeving the outer cylinder on the inner cylinder, one end of the pyrolysis oil and gas pipeline is communicated with the pyrolysis space in the inner cylinder, the other end of the pyrolysis oil and gas pipeline extends in the combustion space, and the outer cylinder close to the other end of the pyrolysis, the pyrolysis oil gas generated by pyrolysis of the inner cylinder body of the pyrolysis unit is guided into a combustion space through the pyrolysis oil gas pipeline and is mixed and combusted with primary air, combustion smoke generated by combustion and secondary air are distributed to provide a heat source for pyrolysis reaction in the inner cylinder body, heat exchange smoke obtained after heat exchange and part of dry cold air are distributed to supply to the drying unit and are used as dry hot air, so that the problems that tar is condensed in the pyrolysis oil gas guiding-out process in the prior art to block the pipeline and a burner, the pyrolysis oil gas is washed and then combusted or other chemicals are produced to produce a large amount of oily wastewater, the difficulty is high are solved, solid materials containing the pyrolysis carbon obtained in the inner cylinder body of the pyrolysis unit can be separated through screening treatment to obtain the pyrolysis carbon, the pyrolysis carbon can be used as a soil conditioner and the like, and economic benefits are improved. Therefore, the method not only effectively solves the problem that the difficulty of oily wastewater is high due to pipeline coking or water washing caused by pyrolysis oil gas derivation in the pyrolysis stage in the existing solid waste treatment process, but also realizes the resource utilization of organic solid waste and reduces the cost.

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

s500: supplying another part of the dry cold air obtained in step S200 to a cyclone for separation, and returning a part of the cold air after separation to step S300 to be used as secondary air

In this step, another part of the dry cold air obtained in the above step S200 is supplied to a cyclone to be separated to obtain separated cold air and particles, and a part of the separated cold air is returned to the step S300 to be used as secondary air. Preferably, the cyclone separator is made of high-temperature resistant materials.

S600: supplying the other part of the separated cold air to an exhaust gas purification unit for purification treatment

In the step, the other part of the separated cold air is supplied to a tail gas purification unit for purification treatment so as to obtain the tail gas reaching the standard. Specifically, the tail gas purification 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 according to actual needs as long as the tail gas can be discharged up to the standard.

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 processing solid waste of claim 1, wherein the pyrolysis oil and gas pipeline extends along the length direction of the inner cylinder, one end of the pyrolysis oil and gas pipeline is close to the front end of the inner cylinder, and the heat exchange smoke outlet is arranged close to the front end of the inner cylinder.

3. The system for treating solid waste according to claim 2, wherein the system comprises a plurality of pyrolysis oil and gas pipelines which are arranged at intervals along the circumferential direction of the outer circumferential wall of the inner cylinder, and the other end of each pyrolysis oil and gas pipeline extends at a different position.

4. The system for processing solid waste according to claim 1, wherein the pyrolysis oil gas pipeline is provided with a plurality of openings at the other end thereof.

5. The system for treating solid waste of claim 1, wherein a baffle is disposed within the combustion space.

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

the cyclone separator is provided with a dry cold air inlet, a separated cold air outlet and a particle outlet, the dry cold air inlet is connected with the dry cold air outlet, and the separated cold air outlet is connected with the secondary air inlet.

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

the tail gas purification unit is provided with a tail gas inlet and a tail gas outlet reaching the standard, and the tail gas inlet is connected with the separated cold air outlet.