CN212746475U - Flue gas purification and waste heat utilization system for low-calorific-value garbage incinerator - Google Patents
Flue gas purification and waste heat utilization system for low-calorific-value garbage incinerator Download PDFInfo
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- CN212746475U CN212746475U CN202021255982.6U CN202021255982U CN212746475U CN 212746475 U CN212746475 U CN 212746475U CN 202021255982 U CN202021255982 U CN 202021255982U CN 212746475 U CN212746475 U CN 212746475U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model relates to a waste incineration exhaust-gas treatment's energy-concerving and environment-protective technical field, this a flue gas purification and waste heat utilization system for low heat value waste incinerator, include: the system comprises a vertical drying furnace, a garbage incinerator, a boiler, a flue gas purification system, a steam turbine generator, a high-temperature heat exchanger and an air preheater; the garbage outlet of the vertical drying furnace is connected with the garbage inlet of the garbage incinerator; the outlet of the garbage incinerator is respectively connected with the flue gas inlet of the boiler and the flue gas inlet of the high-temperature heat exchanger; the steam outlet of the boiler is connected with the steam inlet of the turbonator; the steam outlet of the turbonator is connected with the inlet of the air preheater; an air outlet of the air preheater is connected with an inlet of the high-temperature combustion chamber; the flue gas outlet of the high-temperature heat exchanger is connected with the flue gas inlet of the garbage incinerator; the flue gas outlet of the boiler is connected with the flue gas inlet of the vertical drying furnace; the flue gas outlet of the vertical drying furnace is connected with a flue gas purification system. The utility model discloses realize the stable burning of low calorific value rubbish.
Description
Technical Field
The utility model belongs to the technical field of waste incineration exhaust-gas treatment's energy-concerving and environment-protective technique and specifically relates to a flue gas purification and waste heat utilization system for low calorific value waste incinerator.
Background
With the acceleration of the urbanization process in China and the increasing improvement of the living standard of people, the quantity of urban domestic garbage is increased more and more. At present, the main technologies for garbage disposal are incineration, sanitary landfill, composting and the like. In the areas with more developed economy, compared with the traditional sanitary landfill, composting and other modes, the garbage incineration technology has greater competitive advantages in the aspects of economic cost and environmental cost, and gradually becomes one of the main modes of municipal domestic garbage treatment.
The advantage of waste incineration is that resources are saved, but the pollutant that produces in the waste incineration process is numerous, is the focus of industry concern at present. The waste gas generated in the incineration process of the household garbage mainly contains pollutants such as fly ash particles, acid gas (HF, HCl, SO2 and the like) and the like. Along with the improvement of the environment protection attention of the country and people, the emission requirement of the smoke pollutants is more and more strict, and the requirement on the smoke purification treatment technology is higher and higher.
In addition, most of the garbage in China is mixed and collected, and the garbage has high water content, so that the garbage has low heat value and is difficult to burn. For the waste incineration plants in medium and small cities, the daily treatment capacity of the waste is small, the heat value of the waste is low, and the comprehensive waste incineration treatment cost is high. In order to inhibit the generation of organic pollutants such as dioxin, the temperature of flue gas generated after the waste incineration is generally controlled to be more than 500 ℃, so that the waste heat recovery potential is great, and the waste incineration treatment cost can be greatly reduced by utilizing the waste heat.
The main disadvantages of adding a proper amount of high calorific value fuel during the incineration of garbage are high-quality energy waste and high operating cost.
For the condition of avoiding the waste heat recovery heat exchanger to often block up, current waste incineration flue gas waste heat recovery is gone on after purification treatment mostly, but the flue gas temperature is lower this moment, and the waste heat volume that can retrieve is less, and prior art scheme is more to waste of waste incineration flue gas waste heat.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a gas cleaning and waste heat utilization system for low heat value waste incinerator, this a gas cleaning and waste heat utilization system for low heat value waste incinerator can solve the difficult problem of burning, waste heat recovery is poor, with high costs of low heat value rubbish.
The utility model provides a gas cleaning and waste heat utilization system for low calorific value waste incinerator, include: the system comprises a vertical drying furnace, a garbage incinerator, a boiler, a flue gas purification system, a steam turbine generator, a high-temperature heat exchanger and an air preheater; the garbage outlet of the vertical drying furnace is connected with the garbage inlet of the garbage incinerator; the outlet of the garbage incinerator is respectively connected with the flue gas inlet of the boiler and the flue gas inlet of the high-temperature heat exchanger; the steam outlet of the boiler is connected with the steam inlet of the steam turbine generator; the steam outlet of the steam turbine generator is connected with the inlet of the air preheater; an air outlet of the air preheater is connected with an inlet of the high-temperature combustion chamber; the flue gas outlet of the high-temperature heat exchanger is connected with the flue gas inlet of the garbage incinerator; the flue gas outlet of the boiler is connected with the flue gas inlet of the vertical drying furnace; and a flue gas outlet of the vertical drying furnace is connected with a flue gas purification system.
Wherein the garbage incinerator comprises: fluidized combustion chamber and high-temperature combustion chamber; the bottom of the fluidized combustion chamber is connected with a slag remover and is connected with the high-temperature combustion chamber; and the outlet of the high-temperature combustion chamber is respectively connected with the flue gas inlet of the boiler and the flue gas inlet of the high-temperature heat exchanger.
Wherein, the bottom of the garbage incinerator is connected with a slag remover.
Wherein, the high-temperature heat exchanger is also provided with two air outlets; and the air outlets of the two high-temperature heat exchangers are respectively connected with the air inlets at the middle part and the lower part of the garbage incinerator.
Wherein, the smoke precipitated particle outlet of the boiler is connected with a fly ash conveyor; and a water inlet of the boiler is connected with a water treatment circulating system.
Wherein the fly ash conveyor is connected with a fly ash recovery system; the fly ash recovery system is also connected with an ash bin.
Wherein, the flue gas purification system includes: a deacidification tower and a bag-type dust collector; the bottom parts of the deacidification tower and the bag-type dust remover are provided with the ash bins; the flue gas inlet of the deacidification tower is connected with the flue gas outlet of the vertical drying furnace; the flue gas outlet of the deacidification tower is connected with the flue gas inlet of the bag-type dust remover; and a smoke outlet of the bag-type dust collector is connected with a chimney.
And an active carbon adding device is also arranged between the flue gas outlet of the deacidification tower and the flue gas inlet of the bag-type dust remover.
Wherein the deacidification tower is connected with a deacidification spraying water pipeline; the lower part of the deacidification tower is connected with an outlet of a slaked lime bin through a slaked lime inlet.
Wherein, the air preheater is also connected with a circulating water treatment system.
The utility model relates to a gas cleaning and waste heat utilization system beneficial effect for low heat value waste incinerator: the waste heat of the flue gas is repeatedly utilized through the high-temperature heat exchanger, the high-temperature combustion chamber and the air preheater, and the garbage in the vertical drying furnace is dried through the boiler flue gas, so that the combustion effect of the garbage incinerator is improved, and the flue gas entering the vertical drying furnace is absorbed by the flue gas purification system and is discharged into the atmosphere; the boiler steam provides power for the power generation of the turbine generator.
The utility model relates to a gas cleaning and waste heat utilization system for low heat value waste incinerator still has following beneficial effect:
1. the invention provides a method for supporting combustion of low-calorific-value garbage by using waste heat in a garbage incineration system, which realizes stable combustion of the low-calorific-value garbage under the condition of not increasing the use of high-calorific-value fuel and has the advantages of compact equipment arrangement, small occupied area, safe and reliable operation, easy maintenance, low energy consumption, lower operation cost and the like.
2. The invention adopts the semidry deacidification process, and has the advantages of high utilization rate of the absorbent, no waste water generation, no waste liquid discharge, small equipment corrosion, small temperature drop in the purification process, contribution to the exhaust diffusion of a chimney, low moisture content of the treated flue gas, no need of cooling and heating the flue gas and the like.
3. The vertical drying furnace is adopted to dry the garbage fed into the furnace, the heat source is the waste heat of the flue gas, and the vertical drying furnace has the advantages of small occupied area, high heat efficiency, simple and reliable equipment structure and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a flue gas purification and waste heat utilization system for a low calorific value garbage incinerator according to the present invention;
fig. 2 is a schematic diagram of a flue gas purification and waste heat utilization system for a low-calorific-value garbage incinerator.
Description of reference numerals:
1: a vertical drying furnace; 2: a fluidized combustion chamber; 3: a high-temperature combustion chamber; 4: a boiler; 5: a steam turbine generator; 6: a high temperature heat exchanger; 7: an air preheater; 8: a screw feeder; 9, a slag remover; 10: primary air; 11: secondary air; 12: a fly ash conveyor; 13: a fly ash recovery system; 14: an ash bin; 15: a deacidification tower; 16: a bag-type dust collector; 17: an activated carbon adding device; 18: a water pipeline; 19: a circulating water treatment system; 20: a water treatment circulating system; 21: a chimney; 22: a slaked lime bin.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of 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", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but 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.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, a flue gas purification and waste heat utilization system for a low calorific value garbage incinerator comprises: the system comprises a vertical drying furnace 1, a garbage incinerator, a boiler 4, a flue gas purification system, a turbo generator 5, a high-temperature heat exchanger 6 and an air preheater 7; the garbage outlet of the vertical drying furnace 1 is connected with the garbage inlet of the garbage incinerator; the outlet of the garbage incinerator is respectively connected with the flue gas inlet of the boiler 4 and the flue gas inlet of the high-temperature heat exchanger 6; the steam outlet of the boiler 4 is connected with the steam inlet of the turbonator 5; the steam outlet of the turbonator 5 is connected with the inlet of the air preheater 7; an air outlet of the air preheater 7 is connected with an inlet of the high-temperature combustion chamber 3; the flue gas outlet of the high-temperature heat exchanger 6 is connected with the flue gas inlet of the garbage incinerator; a flue gas outlet of the boiler 4 is connected with a flue gas inlet of the vertical drying furnace 1; the flue gas outlet of the vertical drying furnace 1 is connected with a flue gas purification system.
The vertical drying furnace 1 is a conventional drying furnace; garbage enters from the top of the vertical drying furnace 1, and is dehumidified and dried in the falling process.
The vertical drying furnace 1 is arranged by adopting countercurrent heat exchange, the inclined plate is arranged in the furnace body and used for enhancing the heat exchange in the furnace, the garbage enters from the top of the furnace body and is sent out from the bottom of the furnace body, and the heating smoke enters from the lower part of the furnace body and flows out from the upper part of the furnace body.
The drying heat source is middle-high temperature flue gas flowing out of the waste heat boiler 4, the flue gas is fed from the lower part of the vertical drying furnace 1, and the flue gas exchanges heat with garbage and then flows out of the upper part of the vertical drying furnace 1.
The garbage incinerator is provided with quartz sand in a hearth and burns garbage entering the garbage incinerator.
The unburnt garbage enters the high-temperature combustion chamber 3 to be combusted again.
Part of high-temperature flue gas generated by combustion enters the high-temperature heat exchanger 6 and is directly conveyed into the waste incinerator for secondary utilization through a pipeline arranged in the high-temperature heat exchanger 6.
Further, a garbage outlet at the lower part of the vertical drying furnace 1 is connected with a garbage inlet of the screw feeder 8; the garbage outlet of the screw feeder 8 is connected with the garbage inlet of the garbage incinerator.
The vertical drying furnace 1 is connected with the garbage incinerator through the screw feeder 8, and the conveying tightness is guaranteed.
The vertical rubbish that falls is transversely transmitted for waste incinerator by screw feeder 8.
Further, the garbage incinerator includes: a fluidized combustion chamber 2 and a high-temperature combustion chamber 3; the bottom of the fluidized combustion chamber 2 is connected with a slag remover 9 and is connected with the high-temperature combustion chamber 3; the outlet of the high-temperature combustion chamber 3 is respectively connected with the flue gas inlet of the boiler 4 and the flue gas inlet of the high-temperature heat exchanger 6.
The garbage incinerator adopts a fluidized bed incinerator which comprises a fluidized combustion chamber 2 and a high-temperature combustion chamber 3, and can stabilize the combustion temperature above 800 ℃ and effectively inhibit the formation of organic pollutants.
The gas and solid in the fluidization combustion chamber 2 can enter the high-temperature combustion chamber 3, and the solid in the high-temperature combustion chamber 3 can also fall back to the fluidization combustion chamber 2.
Further, the bottom of the garbage incinerator is connected with a slag remover 9.
The burnt garbage has large specific gravity, falls to the bottom of the garbage incinerator, is cooled by a slag remover 9, and then is conveyed to the outside of the factory by separation equipment.
Further, two air outlets are also arranged on the high-temperature heat exchanger 6; the air outlets of the two high-temperature heat exchangers 6 are respectively connected with the air inlets at the middle part and the lower part of the garbage incinerator.
When the flue gas travels in the pipeline of the high-temperature heat exchanger 6, heating the space outside the pipeline, and feeding the heated air into the waste incinerator twice; the air entering the lower part of the fluidized combustion chamber 2 is primary air 10, and hot quartz sand is blown into the bottom of the furnace to be boiled in the garbage incinerator; secondary air 11 is blown into the middle part of the garbage incinerator to support combustion.
The combustion air of the fluidizing chamber 2 comprises primary air 10 fed from the bottom and secondary air 11 fed from the middle, and is heated by a high temperature air heater.
The heat source of the high-temperature air heater is a small part of smoke of the high-temperature combustion chamber 3 in the garbage incinerator, and the smoke returns to the fluidized combustion chamber 2 of the garbage incinerator after heat exchange in the high-temperature air heater is completed.
The combustion air of the high-temperature combustion chamber 3 is heated by an air preheater 7, and the heat source of the air preheater 7 is steam generated by a steam turbine.
Further, a smoke precipitated particle outlet of the boiler 4 is connected with a fly ash conveyor 12; the water inlet of the boiler 4 is connected to a water treatment circulation system 20.
The temperature of the waste incinerator flue gas in the waste heat boiler 4 can be rapidly reduced from more than 800 ℃ to about 500 ℃, and secondary formation of pollutants such as dioxin is inhibited.
When the flue gas passes through the boiler 4, the temperature is rapidly reduced to cause the carried partial particles to be settled, and the settled particles enter the fly ash conveyor 12 and are sent to the fly ash recovery system 13.
The fly ash recovery system 13 recovers and treats the ash uniformly.
Further, the fly ash conveyor 12 is connected with a fly ash recovery system 13; the fly ash recovery system 13 is also connected to an ash silo 14.
The ash in the ash bin 14 enters the fly ash recovery system 13, and the ash bin 14 is ash generated during the operation of the deacidification tower 15 and the bag-type dust remover 16.
Further, the flue gas cleaning system comprises: a deacidification tower 15 and a bag-type dust collector 16; ash bins 14 are arranged at the bottoms of the deacidification tower 15 and the bag-type dust remover 16; a flue gas inlet of the deacidification tower 15 is connected with a flue gas outlet of the vertical drying furnace 1; the flue gas outlet of the deacidification tower 15 is connected with the flue gas inlet of a bag-type dust remover 16; the smoke outlet of the bag-type dust collector 16 is connected with a chimney 21.
The deacidification tower 15 adopts a semi-dry process, the heat in the flue gas evaporates water in the lime slurry, the lime reacts with acid gas in the flue gas, the product is dry powder, and the product is collected by the ash bin 14 and enters the fly ash recovery system 13.
The bag-type dust collector 16 has a function of cooperatively removing pollutants such as dioxin, heavy metals and the like, the pollutants are adsorbed on the fly ash particles, and the fly ash enters a fly ash recovery processing system after being collected by the ash bin 14.
The deacidification tower 15 and the bag-type dust collector 16 are of conventional structures.
Further, an active carbon adding device 17 is arranged between the flue gas outlet of the deacidification tower 15 and the flue gas inlet of the bag-type dust collector 16.
The activated carbon adding device 17 is of a conventional carbon adding structure, and aims to improve the dust removal efficiency (by utilizing the adsorbability of activated carbon) of the bag-type dust remover 16.
Further, the deacidification tower 15 is connected with a deacidification spraying water pipeline 18; the lower part of the deacidification tower 15 is connected with an outlet of a slaked lime bin 22 through a slaked lime inlet.
The water connected by water line 18 is the water produced by the recirculating upper treatment system.
The slaked lime bin 22 provides slaked lime for the deacidification tower 15.
Further, the air preheater 7 is also connected with a circulating water treatment system 19.
The heat source air of the air preheater 7 enters the circulating water treatment system 19 for recycling after being subjected to heat exchange and temperature reduction.
The circulating water treatment system 19 condenses the water vapor generated after the steam power generation to form water, and the water is put into the flue gas purification and waste heat utilization system for the low-heat value garbage incinerator again, so that the water resource is recycled.
The water treatment circulating system 20 and the circulating water treatment system 19 are the same water system.
The specific steps of this example are as follows:
(1) the garbage entering the factory is dried in the vertical drying furnace 1, the garbage is fed from the top of the vertical drying furnace 1, and is dried in the drying furnace by countercurrent heat exchange with hot flue gas and then is fed out from the bottom of the vertical drying furnace 1; and then is sent to the lower part of the garbage incinerator by a screw feeder 8. The drying heat source is middle-high temperature flue gas flowing out from the waste heat boiler 4, the flue gas is fed from the lower part of the vertical drying furnace 1, exchanges heat with garbage and then flows out from the upper part of the drying furnace, and enters a flue gas purification system.
(2) The garbage incinerator adopts a fluidized bed furnace, a large amount of quartz sand is added into a hearth, the quartz sand is heated to be more than 600 ℃, primary hot air with the temperature of more than 200 ℃ is blown into the bottom of the furnace, the hot sand is boiled in a fluidized combustion chamber 2, and then garbage is added. The garbage and the hot quartz sand are boiled together, and the garbage is quickly ignited and burnt. Unburned garbage has a relatively low specific gravity, is continuously boiled and combusted in the high-temperature combustion chamber 3, has a relatively high specific gravity, falls to the bottom of the fluidized combustion chamber 2, is cooled by a slag remover 9 (conventional structure), and then is conveyed to the outside of a plant by using sorting equipment (conventional structure), and is sorted to sort out a small amount of medium slag and quartz sand, and the medium slag and the quartz sand are conveyed back to the furnace for continuous recycling through lifting equipment (conventional structure). A small part of high-temperature flue gas is pumped out from the garbage incinerator and enters a high-temperature air heater to heat air entering the incinerator, medium-high-temperature flue gas flowing out from the high-temperature air heater returns to the garbage incinerator, and air heated in the high-temperature air heater respectively enters the lower part and the middle part of the garbage incinerator to serve as primary air 10 and secondary air 11 to support combustion.
(3) After the flue gas of the garbage incinerator flows out of the incinerator, most of the flue gas enters the waste heat boiler 4 to heat water, the water is heated by the flue gas in the waste heat boiler 4 to become high-temperature high-pressure steam, the steam enters the steam turbine generator 5 to generate electricity, then the steam waste heat is used for heating air entering the incinerator, and finally the low-temperature steam enters the circulating water treatment system 19 to be treated and then is recycled. When the flue gas passes through the boiler 4, the temperature is rapidly reduced to cause the carried partial particles to be settled, and the settled particles enter the fly ash conveyor 12 and are sent to the fly ash recovery system 13.
(4) The steam generated by the steam turbine flows out of the steam turbine and then enters the air preheater 7 to preheat the air entering the high-temperature combustion chamber 3 of the garbage incinerator, and then enters the circulating water treatment system 19.
(5) The fume flowing out of the upper part of the drying furnace enters from the lower part of the deacidification tower 15 and undergoes chemical reaction in a fluidized bed layer formed by powder slaked lime, and the fume is intensively stirred with the slaked lime absorbent powder within a certain flow velocity range and is recycled for many times. The flue gas is well mixed with the lime slurry in the turbulent bed, the sulfur dioxide is absorbed and converted into calcium sulfite and a small amount of sulfate, and the reacted solid particles are removed from the bed and enter the ash bin 14.
(6) The flue gas flowing out of the upper part of the deacidification tower 15 is added with activated carbon with adsorption effect by an activated carbon adding device 17 before entering the bag-type dust remover 16, then enters the bag-type dust remover 16 to remove pollutants such as particulate matters, dioxin, heavy metals and the like, flows out of the bag-type dust remover 16 to become standard flue gas, and then enters the diffusing chimney 21 to be discharged.
Referring to fig. 2, the flowing direction of water in this patent is as follows: a water treatment circulating system 20, a boiler 4, a turbo generator 5, an air preheater 7 and a circulating water treatment system 19;
the garbage flow direction is as follows in sequence: a vertical drying furnace 1, a garbage incinerator and a slag remover 9;
the flow direction of the flue gas is as follows in sequence: the system comprises a garbage incinerator, a boiler 4, a vertical drying furnace 1, a deacidification tower 15, a bag-type dust remover 16 and a chimney; in addition, after the waste incinerator generates, a part of the flue gas enters the high-temperature heat exchanger 6 and returns to the waste incinerator through the high-temperature heat exchanger 6;
the air flow direction is as follows in sequence: the air enters an air preheater 7 and a garbage incinerator; and one path of air enters a high-temperature heat exchanger 6 and enters the garbage incinerator from the high-temperature heat exchanger.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. A flue gas purification and waste heat utilization system for a low-heat value garbage incinerator is characterized by comprising: the system comprises a vertical drying furnace (1), a garbage incinerator, a boiler (4), a flue gas purification system, a turbo generator (5), a high-temperature heat exchanger (6) and an air preheater (7); the garbage outlet of the vertical drying furnace (1) is connected with the garbage inlet of the garbage incinerator; the outlet of the garbage incinerator is respectively connected with the flue gas inlet of the boiler (4) and the flue gas inlet of the high-temperature heat exchanger (6); the steam outlet of the boiler (4) is connected with the steam inlet of the steam turbine generator (5); the steam outlet of the steam turbine generator (5) is connected with the inlet of the air preheater (7); an air outlet of the air preheater (7) is connected with an inlet of the high-temperature combustion chamber (3); the flue gas outlet of the high-temperature heat exchanger (6) is connected with the flue gas inlet of the garbage incinerator; the flue gas outlet of the boiler (4) is connected with the flue gas inlet of the vertical drying furnace (1); and a flue gas outlet of the vertical drying furnace (1) is connected with a flue gas purification system.
2. The system for purifying the flue gas and utilizing the waste heat of the low-heating-value garbage incinerator according to the claim 1, characterized in that a garbage outlet below the vertical drying furnace (1) is connected with a garbage inlet of a screw feeder (8); and a garbage outlet of the screw feeder (8) is connected with a garbage inlet of the garbage incinerator.
3. The system for purifying flue gas and utilizing waste heat of a low heating value garbage incinerator according to claim 1, wherein said garbage incinerator comprises: a fluidized combustion chamber (2) and a high-temperature combustion chamber (3); the bottom of the fluidized combustion chamber (2) is connected with a slag remover (9) and is connected with the high-temperature combustion chamber (3); and the outlet of the high-temperature combustion chamber (3) is respectively connected with the flue gas inlet of the boiler (4) and the flue gas inlet of the high-temperature heat exchanger (6).
4. The system for purifying the flue gas and utilizing the waste heat of the low heat value garbage incinerator according to the claim 1, characterized in that two air outlets are also arranged on the high temperature heat exchanger (6); and air outlets of the two high-temperature heat exchangers (6) are respectively connected with air inlets at the middle part and the lower part of the garbage incinerator.
5. A flue gas cleaning and waste heat utilization system for a low heating value waste incinerator according to claim 1, characterized in that the flue gas precipitated particulate matter outlet of said boiler (4) is connected with fly ash conveyor (12); and a water inlet of the boiler (4) is connected with a water treatment circulating system (20).
6. The system for purifying flue gas and utilizing waste heat of a low heating value waste incinerator according to claim 5, characterized in that said fly ash conveyor (12) is connected with fly ash recovery system (13); the fly ash recovery system (13) is also connected with an ash bin (14).
7. The system for purifying flue gas and utilizing waste heat of a low heating value waste incinerator according to claim 6, characterized in that said flue gas purification system comprises: a deacidification tower (15) and a bag-type dust collector (16); the ash bin (14) is arranged at the bottom of the deacidification tower (15) and the bag-type dust remover (16); a flue gas inlet of the deacidification tower (15) is connected with a flue gas outlet of the vertical drying furnace (1); the smoke outlet of the deacidification tower (15) is connected with the smoke inlet of a bag-type dust remover (16); and a smoke outlet of the bag-type dust collector (16) is connected with a chimney (21).
8. The system for purifying the flue gas and utilizing the waste heat of the low-calorific-value garbage incinerator according to claim 7, wherein an activated carbon adding device (17) is further arranged between the flue gas outlet of the deacidification tower (15) and the flue gas inlet of the bag-type dust collector (16).
9. The system for purifying flue gas and utilizing waste heat of a low heating value garbage incinerator according to claim 7, characterized in that said deacidification tower (15) is connected with a water pipeline (18) for deacidification spraying; the lower part of the deacidification tower (15) is connected with an outlet of a slaked lime bin (22) through a slaked lime inlet.
10. A flue gas cleaning and waste heat utilization system for a low heating value waste incinerator according to claim 1, characterized in that said air preheater (7) is further connected with a circulating water treatment system (19).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021255982.6U CN212746475U (en) | 2020-07-01 | 2020-07-01 | Flue gas purification and waste heat utilization system for low-calorific-value garbage incinerator |
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| CN202021255982.6U CN212746475U (en) | 2020-07-01 | 2020-07-01 | Flue gas purification and waste heat utilization system for low-calorific-value garbage incinerator |
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