CN210463016U - Waste pyrolysis and incineration harmless disposal system based on pulverized coal fired boiler - Google Patents
Waste pyrolysis and incineration harmless disposal system based on pulverized coal fired boiler Download PDFInfo
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- CN210463016U CN210463016U CN201921437625.9U CN201921437625U CN210463016U CN 210463016 U CN210463016 U CN 210463016U CN 201921437625 U CN201921437625 U CN 201921437625U CN 210463016 U CN210463016 U CN 210463016U
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Abstract
The utility model provides a rubbish pyrolysis and burn innocent treatment system based on pulverized coal boiler, simple structure, reasonable in design, convenient to use, environment friendly, factor of safety is high. The system comprises a boiler hearth, a flue and a flue gas system which are connected in sequence, and a drying and pyrolysis device, a crushing and conveying device and a garbage combustor which are connected in sequence; the input end of the drying and pyrolyzing device is sequentially provided with a garbage crushing and sorting device and a feeder, and a flue gas system is connected to the input end of the feeder; the smoke system comprises a high-temperature smoke pipeline and a medium-temperature smoke pipeline, the high-temperature smoke pipeline is connected to the bottom of a hearth of the pulverized coal boiler to extract high-temperature smoke, and the medium-temperature smoke pipeline is connected to a steering chamber of the pulverized coal boiler to a flue at the outlet of the coal economizer to extract medium-temperature smoke; the garbage burner is arranged between the coal powder burner at the lowest layer of the main burner of the boiler hearth and the over-fire air burner.
Description
Technical Field
The utility model belongs to city domestic waste environmental protection utilizes the field, relates to a city domestic waste deals with and utilizes the technique, specifically is a waste pyrolysis and burn innocent treatment system based on pulverized coal boiler.
Background
The traditional garbage incineration is carried out on a grate furnace or a circulating fluidized bed boiler, but the temperature of the hearth of the grate furnace and the circulating fluidized bed boiler is low, so that dioxin and precursor thereof generated in the garbage incineration process cannot be thoroughly eliminated. Although the temperature of the hearth of the pulverized coal fired boiler is higher, the pulverized coal fired boiler cannot directly burn and treat garbage due to the pulverized coal suspension combustion mode. The dry and wet forms of the garbage materials are complex, the garbage materials cannot be directly ground into powder by the existing equipment and the powder is sent into a hearth for burning, and the odor of the garbage is very easy to diffuse, so that the pulverized coal boiler cannot mix and burn the garbage.
The municipal solid waste refers to solid waste generated in daily life of cities and solid waste regarded as municipal solid waste by laws and administrative rules, and has the characteristics of complex components, high water content, high inorganic substance content and the like. Along with the acceleration of the urbanization process of China, the urban development and the living standard of people are continuously improved, the generation amount of urban domestic garbage of China is increased year by year, the problem of environmental pollution caused by the urban domestic garbage is more and more serious, the urban domestic garbage becomes a problem of general attention in the world increasingly, and the urban domestic garbage is a very difficult comprehensive and systematic project.
At present, the main treatment methods of municipal solid waste are a landfill method, a composting method and an incineration method, the treatment and disposal levels and modes of various municipal solid waste are greatly different, the standardized treatment and disposal of most of the municipal solid waste just starts, sanitary landfill is the main treatment and disposal method of most of the municipal solid waste, and a part of cities also have simple landfill sites to operate.
The garbage incineration is one of the main methods for treating the urban garbage, and after the garbage is treated by an incineration method, the garbage can be reduced, the land is saved, and various pathogens can be killed. The modern waste incineration is to achieve the purposes of volume reduction, weight reduction and resource utilization after full combustion at high temperature, and mainly comprises three stages of drying, combustion and burnout. The automatic control system of the computer and the automatic combustion control system can monitor and adjust the combustion condition of the garbage in the furnace in real time, and adjust the running speed and the combustion air quantity of the fire grate in time so as to ensure that the garbage treatment is always in a controllable state. The volume reduction rate of the incinerated garbage is very high, the volume of the garbage can be reduced by 80-90%, the volume reduction and weight reduction of garbage treatment are realized, the land resource occupied by the garbage is reduced to the maximum extent, and the heat energy generated by the incineration of the garbage can be effectively utilized.
At present, the common opinion about the decomposition of dioxin is that the dioxin can be completely decomposed by staying at about 850 ℃ for 2 seconds in a hearth, or staying at about 1000 ℃ for 1 second in the hearth, or staying at about 1200 ℃ for a few microseconds. If the temperature is controlled to be over 1200 ℃, the product hardly contains dioxin precursors, and the later re-synthesis probability is greatly reduced. The existing garbage incineration method is not accepted by the masses all the time, and the defect is highlighted by the limitation of the combustion temperature; the highest temperature of the existing household garbage incinerator is about 800-1000 ℃, dioxin substances cannot be decomposed at high temperature completely, and the latent dioxin and heavy metal pollution is heavier, the investment is expensive, the operation is complex, resources are wasted, and the like. Although pollution prevention and control technologies are improved day by day, the pollution prevention and control technologies are immature so far and cannot be popularized and applied on a large scale.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a rubbish pyrolysis and burn innocent treatment system based on pulverized coal boiler, simple structure, reasonable in design, convenient to use, environment friendly, factor of safety is high.
The utility model discloses a realize through following technical scheme:
a pulverized coal boiler-based garbage pyrolysis and incineration harmless disposal system comprises a boiler furnace, a flue and a flue gas system which are sequentially connected, and a drying and pyrolysis device, a crushing and conveying device and a garbage combustor which are sequentially connected;
the input end of the drying and pyrolyzing device is sequentially provided with a garbage crushing and sorting device and a feeder, and a flue gas system is connected to the input end of the feeder;
the smoke system comprises a high-temperature smoke pipeline and a medium-temperature smoke pipeline, the high-temperature smoke pipeline is connected to the bottom of a hearth of the pulverized coal boiler to extract high-temperature smoke, and the medium-temperature smoke pipeline is connected to a steering chamber of the pulverized coal boiler to a flue at the outlet of the coal economizer to extract medium-temperature smoke;
the garbage burner is arranged between the coal powder burner at the lowest layer of the main burner of the boiler hearth and the over-fire air burner.
Preferably, the garbage crushing and sorting device is used for crushing and sorting, sieving metal and stones, and the residual household garbage outlet is connected with the input end of the feeder.
Preferably, the drying and pyrolyzing means includes a rotary housing and a rotary driving motor disposed outside the rotary housing; the rotary shell is hollow and cylindrical, the input end of the rotary shell is connected with the feeder in a rotating and sealing mode, and the output end of the rotary shell is connected with the inlet of the crushing and conveying device in a rotating and sealing mode.
Furthermore, a plurality of steel balls and grid plates for dividing the hollow cylinder into a plurality of cavities are arranged in the rotary shell, the steel balls are respectively arranged in the plurality of cavities, and the steel balls and the grid plates rotate together with the rotary shell.
Preferably, the feeding machine adopts a spiral feeder.
Preferably, the crushing and conveying device adopts a powder discharging machine.
Preferably, the input end of the medium-temperature flue gas pipeline is sequentially provided with a plurality of flue gas taking ports along the direction-changing chamber to the outlet flue of the coal economizer, and the output end of the medium-temperature flue gas pipeline is combined with the high-temperature flue gas pipeline.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the system related by the utility model has simple composition, and the initial investment and the operation and maintenance cost are greatly reduced; the high-temperature flue gas is provided by the conventional coal-fired boiler, so that the garbage can be fully dried and pyrolyzed, one side of the drying and pyrolyzing device is in negative pressure, and the other side of the drying and pyrolyzing device is in low oxygen, so that a garbage pyrolyzing environment with high temperature and low oxygen and negative pressure is formed, the generation of dioxin and precursor thereof can be effectively inhibited, and the high-temperature low-oxygen negative-pressure garbage pyrolyzing device is safe, efficient, environment-friendly and reliable; meanwhile, the flue gas can carry combustible gas to be supplemented back to the hearth, so that not only is the flue gas amount not reduced, but also heat supply is increased, and high temperature and subsequent heat recovery and filtration systems in the coal-fired boiler are fully utilized, so that the municipal domestic garbage is subjected to harmless treatment.
Drawings
Fig. 1 is a schematic diagram of a system according to an embodiment of the present invention.
In the figure: 1 is boiler furnace, 2 is the boiler flue, 3 is the flue gas system, 4 is drying and pyrolysis device, 401 is rotary shell, 402 is the rotation driving motor, 5 is smashing conveyor, 6 is the rubbish combustor, 7 is the high temperature flue gas pipeline, 8 is the medium temperature flue gas pipeline, 9 is rubbish smashing and sorting unit, 10 is the batcher, 11 is the SOFA combustor, 12 is the OFA combustor, 13 is main combustor.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The utility model relates to a pulverized coal boiler based garbage pyrolysis and incineration innocent treatment system, as shown in figure 1, comprising a boiler furnace 1, a flue 2 and a flue gas system 3 which are connected in sequence, and a drying and pyrolysis device 4, a crushing and conveying device 5 and a garbage burner 6 which are connected in sequence, wherein the input end of the drying and pyrolysis device 4 is sequentially provided with a garbage crushing and sorting device 9 and a feeder 10, and the flue gas system 3 is connected to the input end of the feeder 10; the fume system 3 comprises a high temperature fume line 7 and a medium temperature fume line 8.
The household garbage is firstly sent into a garbage crushing and sorting device 9 for crushing and sorting, wherein the garbage which is not suitable for drying and pyrolysis, such as metal, stone and the like, is screened, and the garbage which is suitable for drying and pyrolysis is sent into a drying and pyrolysis device 4 by a feeder 10.
High temperature flue gas is extracted from the bottom of a furnace cavity of the pulverized coal boiler through a high temperature flue gas pipeline 7 in a flue gas system 3, the temperature of the high temperature flue gas is more than 750 ℃, medium temperature flue gas is taken from a steering chamber of the pulverized coal boiler to an outlet flue of a coal economizer through a medium temperature flue gas pipeline 8, the temperature of the medium temperature flue gas is 300-700 ℃, the taking position of specific flue gas is determined by the temperature of the required flue gas, the temperature of the flue gas is determined by the property of garbage needing to be treated, the required temperature of the flue gas is controlled by adopting a multipoint flue gas mixing mode, a plurality of smoke taking ports are sequentially arranged at the input end of the medium temperature flue gas pipeline 8 along the steering chamber to the outlet flue of the coal economizer, and the high temperature.
The flue gas after mixing is sent into 4 entrances of drying and pyrolysis device through batcher 10, forms the high temperature low oxygen environment in drying and pyrolysis device 4, and rubbish is heated pyrolysis by the flue gas under the high temperature low oxygen environment, and desorption moisture separates out gaseous state material. Wherein the gaseous substance enters the hearth along with the flue gas and further participates in the combustion of the coal-fired boiler.
The drying and pyrolysis device 4 is rotatable, the steel balls and the grating plates are arranged in the drying and pyrolysis device 4 and rotate together during operation, residual solid garbage residues after garbage pyrolysis rotate together with the steel balls and the grating plates in the drying and pyrolysis device 4, the residual solid garbage residues are crushed into fine particles under the extrusion effect of the steel balls and then are carried into the crushing and conveying device 5 by the smoke of the boiler, fine powder suitable for combustion of the boiler can be further ground, and meanwhile, heat exchange in the device can be enhanced through the steel balls. The outlet of the drying and pyrolysis device 4 is provided with a crushing and conveying device 5, which can further crush the solid residues at the upstream and convey the solid residues to the hearth through the smoke system 3. The crushing and conveying device 5 can simultaneously enable upstream equipment and pipelines thereof to be in a negative pressure state, on one hand, power is provided for extracting furnace smoke and conveying materials, and on the other hand, materials and waste gas are prevented from leaking.
Specifically, the drying and pyrolysis apparatus 4 includes a rotary casing 401 and a rotary drive motor 402 disposed outside the rotary casing 401; the rotary shell 401 is in a hollow cylindrical shape, the input end of the rotary shell is in rotary sealing connection with the feeder 10 adopting a spiral feeder, and the output end of the rotary shell is in rotary sealing connection with the inlet of the crushing and conveying device 5 adopting a powder exhauster; be provided with a plurality of steel balls in the rotating shell 401 to and separate the hollow cylinder for the grid plate of a plurality of cavities, the steel ball branch is put in a plurality of cavities, through the steel ball and the coextrusion effect to dry rubbish when grid plate is rotatory for the domestic waste after the drying is broken into tiny granule.
Gaseous substances and solid residues separated out from the garbage in the drying and pyrolysis device 4 are sent into the garbage combustor 6 between the coal powder combustor at the lowest layer of the main combustor 13 of the boiler hearth 1 and the over-fire air combustor 12 along with smoke gas for combustion disposal, the area is the most active area for coal powder combustion, because a large amount of coal powder participates in combustion, the hearth temperature is above 1300 ℃, and the combustion time of garbage decomposers in the coal powder boiler hearth exceeds 2 seconds, the generated dioxin and precursor thereof can be completely decomposed, the dioxin combustion residue is avoided, and the dioxin precursor is polymerized in a low-temperature flue at the tail part to generate the dioxin again, so that harmless disposal is realized.
The utility model relates to a waste pyrolysis and burn innocent treatment system based on pulverized coal fired boiler is applicable to and is located the coal fired power plant that there is city domestic waste transportation condition in the city periphery and carries out the coal-fired power generation production of city domestic waste coupling. A new municipal solid waste disposal and utilization technology is developed, dioxin generated in the waste incineration process is eliminated, the disposal cost of the municipal solid waste is reduced, the utilization rate of the municipal solid waste is improved, and the market competitiveness and the enterprise image of coal-fired power generation enterprises are enhanced. The pollution of the surrounding atmosphere and the water environment caused by the traditional garbage incineration is avoided, and meanwhile, the resources of electricity, steam, heat and the like of the coal-fired power plant are utilized in the garbage treatment industry, so that the cost and social influence of the urban domestic garbage treatment are fully reduced.
The utility model relates to a rubbish pyrolysis and burn innocent treatment system based on pulverized coal fired boiler, during the use, carry out drying and pyrolysis to rubbish through extraction pulverized coal fired boiler hot flue gas, gas and solid-state material after the pyrolysis are sent into pulverized coal fired boiler furnace in by broken back and are burned with a large amount of buggy, combustion air mixture, avoid producing dioxin and precursor, realize the innocent treatment of rubbish, because the oxygen concentration of extraction flue gas is lower, prevent the explosion that probably takes place in rubbish decomposition and the transport.
The smoke dries the garbage to evaporate water, and organic matters in the garbage are further pyrolyzed into CO and H2、 CH4And the gas substances do not generate combustion reaction under the low-oxygen condition of the flue gas, so that the generation of dioxin is reduced.
The furnace smoke system 3 is used for extracting high-temperature smoke and medium-temperature smoke from the hearth 1 or the flue 2 of the pulverized coal boiler and then conveying the dried and pyrolyzed materials, the drying and pyrolyzing device 4 and the material crushing and conveying device 5 are used for drying and pyrolyzing garbage, and then garbage is incinerated through the hearth 1 of the pulverized coal boiler and the garbage combustor 6.
Compared with the traditional household garbage incinerator, the highest temperature is about 800-1000 ℃, and dioxin substances cannot be decomposed at high temperature completely. The pulverized coal fired boiler can well organize combustion, the combustion temperature in the boiler is above 1300 ℃, smoke stays in the boiler for 2-3 s, dioxin substances are completely decomposed, sufficient heat transfer and mass transfer enable dioxin organic precursors to be subjected to sufficient oxidation combustion in the area, and products do not contain the dioxin precursors, so that the possibility of resynthesis of the dioxin in a smoke temperature range of 300-500 ℃ is eliminated as far as possible. Therefore, the domestic garbage treatment technology of the utility model can better control the discharge of dioxin. The household garbage materials are pretreated and then directly enter the hearth for combustion, so that potential safety hazards of combustible gas explosion and leakage do not exist, the garbage materials in front of the furnace smoke fan are in a negative pressure system, no intermediate product is leaked outwards, and the surrounding environment is not affected; wherein the heat required by the drying of the municipal solid waste comes from the flue gas of the coal-fired boiler, other primary energy or self domestic waste energy is not required to be consumed, and the energy utilization efficiency is high.
Claims (7)
1. A pulverized coal boiler-based garbage pyrolysis and incineration harmless disposal system is characterized by comprising a boiler furnace (1), a flue (2) and a flue gas system (3) which are sequentially connected, and a drying and pyrolysis device (4), a crushing and conveying device (5) and a garbage combustor (6) which are sequentially connected;
the input end of the drying and pyrolysis device (4) is sequentially provided with a garbage crushing and sorting device (9) and a feeder (10), and the furnace smoke system (3) is connected to the input end of the feeder (10);
the smoke system (3) comprises a high-temperature smoke pipeline (7) and a medium-temperature smoke pipeline (8), wherein the high-temperature smoke pipeline (7) is connected to the bottom of a hearth of the pulverized coal boiler to extract high-temperature smoke, and the medium-temperature smoke pipeline (8) is connected to a steering chamber of the pulverized coal boiler to a flue at an outlet of the economizer to extract medium-temperature smoke;
the garbage combustor (6) is arranged between the coal powder combustor at the lowest layer of a main combustor (13) of a boiler hearth (1) and an over-fire air combustor (12).
2. The pulverized coal boiler-based waste pyrolysis and incineration harmless disposal system as claimed in claim 1, wherein the waste crushing and sorting device (9) is used for crushing and sorting, screening metals and stones, and the residual domestic waste outlet is connected with the input end of the feeder (10).
3. The pulverized coal boiler-based waste pyrolysis and incineration harmless disposal system according to claim 1, wherein the drying and pyrolysis device (4) comprises a rotary housing (401) and a rotary driving motor (402) arranged outside the rotary housing (401); the rotary shell (401) is hollow and cylindrical, the input end of the rotary shell is connected with the feeder (10) in a rotating and sealing mode, and the output end of the rotary shell is connected with the inlet of the crushing and conveying device (5) in a rotating and sealing mode.
4. The pulverized coal boiler-based garbage pyrolysis and incineration harmless disposal system according to claim 3, wherein a plurality of steel balls and grid plates dividing the hollow cylinder into a plurality of chambers are arranged in the rotary housing (401), the steel balls are arranged in the plurality of chambers, and the steel balls and the grid plates rotate together with the rotary housing (401).
5. The pulverized coal boiler-based waste pyrolysis and incineration harmless disposal system according to claim 1, wherein the feeding machine (10) adopts a screw conveyor.
6. The pulverized coal boiler-based waste pyrolysis and incineration harmless disposal system according to claim 1, wherein the crushing and conveying device (5) adopts a powder exhauster.
7. The pulverized coal boiler-based garbage pyrolysis and incineration harmless disposal system according to claim 1, wherein the input end of the medium temperature flue gas pipeline (8) is sequentially provided with a plurality of smoke taking ports along the flue from the turning chamber to the outlet of the economizer, and the output end is merged with the high temperature flue gas pipeline (7).
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| CN201921437625.9U CN210463016U (en) | 2019-08-30 | 2019-08-30 | Waste pyrolysis and incineration harmless disposal system based on pulverized coal fired boiler |
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| CN201921437625.9U CN210463016U (en) | 2019-08-30 | 2019-08-30 | Waste pyrolysis and incineration harmless disposal system based on pulverized coal fired boiler |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110440262A (en) * | 2019-08-30 | 2019-11-12 | 西安西热锅炉环保工程有限公司 | A kind of refuse pyrolysis and burning harmlessness disposing system and method based on pulverized-coal fired boiler |
| CN113654048A (en) * | 2021-08-27 | 2021-11-16 | 西安热工研究院有限公司 | Waste incineration system |
| CN113816081A (en) * | 2021-10-18 | 2021-12-21 | 西安西热锅炉环保工程有限公司 | Device and method for heating by using high-temperature flue gas or hot air to assist in conveying solid waste |
| CN113883524A (en) * | 2021-10-18 | 2022-01-04 | 西安西热锅炉环保工程有限公司 | Heavy metal-containing multi-source waste disposal system and method based on pulverized coal fired boiler |
-
2019
- 2019-08-30 CN CN201921437625.9U patent/CN210463016U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110440262A (en) * | 2019-08-30 | 2019-11-12 | 西安西热锅炉环保工程有限公司 | A kind of refuse pyrolysis and burning harmlessness disposing system and method based on pulverized-coal fired boiler |
| CN113654048A (en) * | 2021-08-27 | 2021-11-16 | 西安热工研究院有限公司 | Waste incineration system |
| CN113816081A (en) * | 2021-10-18 | 2021-12-21 | 西安西热锅炉环保工程有限公司 | Device and method for heating by using high-temperature flue gas or hot air to assist in conveying solid waste |
| CN113883524A (en) * | 2021-10-18 | 2022-01-04 | 西安西热锅炉环保工程有限公司 | Heavy metal-containing multi-source waste disposal system and method based on pulverized coal fired boiler |
| CN113883524B (en) * | 2021-10-18 | 2022-06-28 | 西安西热锅炉环保工程有限公司 | Heavy metal-containing multi-source waste disposal system and method based on pulverized coal fired boiler |
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