CN219933980U - System for coupling pyrolysis of solid waste and combustion of boiler - Google Patents
System for coupling pyrolysis of solid waste and combustion of boiler Download PDFInfo
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- CN219933980U CN219933980U CN202320787429.4U CN202320787429U CN219933980U CN 219933980 U CN219933980 U CN 219933980U CN 202320787429 U CN202320787429 U CN 202320787429U CN 219933980 U CN219933980 U CN 219933980U
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- flue gas
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- boiler
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- 238000000197 pyrolysis Methods 0.000 title claims abstract description 116
- 239000002910 solid waste Substances 0.000 title claims abstract description 58
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 35
- 230000008878 coupling Effects 0.000 title claims abstract description 17
- 238000010168 coupling process Methods 0.000 title claims abstract description 17
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 17
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 60
- 239000003546 flue gas Substances 0.000 claims abstract description 60
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000007789 gas Substances 0.000 claims abstract description 41
- 238000000605 extraction Methods 0.000 claims description 22
- 238000005406 washing Methods 0.000 claims description 18
- 238000012216 screening Methods 0.000 claims description 12
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000004064 recycling Methods 0.000 abstract description 7
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- 239000002296 pyrolytic carbon Substances 0.000 description 11
- 230000015572 biosynthetic process Effects 0.000 description 10
- 238000003786 synthesis reaction Methods 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 229910001868 water Inorganic materials 0.000 description 8
- 239000000047 product Substances 0.000 description 7
- 238000002309 gasification Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000010791 domestic waste Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 239000002906 medical waste Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Gasification And Melting Of Waste (AREA)
Abstract
The utility model relates to the technical field of solid waste recycling treatment, and discloses a system for coupling pyrolysis and boiler combustion of solid waste, which comprises a solid waste pyrolysis part and a boiler combustion part, wherein the solid waste pyrolysis part comprises a solid waste bin, a pyrolysis reactor, a flue gas attemperator, an induced draft fan, a dividing wall type dryer, a steam attemperator and a ball mill; the boiler combustion part mainly comprises a coal-fired boiler, an air preheater, a gas burner and a carbon powder burner; the solid waste bin, the pyrolysis reactor, the flue gas attemperator and the air preheater are sequentially communicated, the pyrolysis reactor, the induced draft fan and the air preheater are sequentially communicated, the pyrolysis reactor, the dividing wall type dryer, the steam attemperator and the coal-fired boiler are sequentially communicated, and the coal-fired boiler, the air preheater and the gas burner are sequentially communicated. The utility model solves the problems of insufficient recycling degree, higher pollutant emission and the like in the prior art.
Description
Technical Field
The utility model relates to the technical field of solid waste recycling treatment, in particular to a system for coupling pyrolysis of solid waste and combustion of a boiler.
Background
The variety of solid waste is numerous, including industrial waste, agricultural and forestry waste, automobile waste, municipal domestic waste, oil sludge, medical waste and the like, and with the increase of the degree of town, the amount of solid waste to be cleared is increased year by year.
Conventional landfills have been disabled and the requirements of the construction of incineration plants on investment and treatment scale are high.
The pyrolysis technology of the solid waste is mature, and the pyrolysis reaction is a process of thermally decomposing the solid waste into solid carbon residue, synthesis gas and tar by a direct or indirect contact heating mode, and has the advantages of high reduction degree, wide material adaptability and the like. The synthesis gas and pyrolytic carbon residue generated by pyrolysis have a certain heat value, and conventionally, the synthesis gas is burnt in a special combustion chamber and then is emptied, and the pyrolytic carbon residue is directly subjected to landfill treatment.
The pyrolysis technology has great advantages in the aspects of reduction and harmlessness, but (1) the pyrolysis product has no better energy application scene, and the pyrolysis technology has room for improvement in the aspect of recycling; (2) Meanwhile, the emission of pyrolysis technology pollutants, such as dioxin and dust, is higher compared to high temperature incineration.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model provides a system for coupling pyrolysis of solid waste and combustion of a boiler, and solves the problems of insufficient recycling degree, higher pollutant emission and the like in the prior art.
The utility model solves the problems by adopting the following technical scheme:
a system for coupling pyrolysis of solid waste and combustion of a boiler comprises a pyrolysis part of the solid waste and a combustion part of the boiler, wherein the pyrolysis part of the solid waste comprises a solid waste bin, a pyrolysis reactor, a flue gas attemperator, an induced draft fan, a dividing wall type dryer, a steam attemperator and a ball mill; the boiler combustion part mainly comprises a coal-fired boiler, an air preheater, a gas burner and a carbon powder burner; the pyrolysis reactor, the induced draft fan and the air preheater are sequentially communicated, the pyrolysis reactor, the dividing wall type dryer, the steam temperature and pressure reducer and the coal-fired boiler are sequentially communicated, the coal-fired boiler, the air preheater and the gas burner are sequentially communicated, the coal-fired boiler, the air preheater and the carbon powder burner are sequentially communicated, and the pyrolysis reactor is communicated with the gas burner, and the dividing wall type dryer, the ball mill and the carbon powder burner are sequentially communicated.
As a preferable technical scheme, the device also comprises a pyrolysis reactor, a washing tank, a screening device and a dividing wall type dryer material channel which are sequentially communicated, wherein a steam temperature and pressure reducer and a main steam D steam extraction pipeline are sequentially connected to the heat source inlet side of the dividing wall type dryer.
As a preferable technical scheme, the pyrolysis device further comprises a filter, and the pyrolysis reactor, the filter and the gas burner are sequentially communicated.
As a preferable technical scheme, the device also comprises a ball mill, a partition wall type dryer, the ball mill and a carbon powder burner which are communicated in sequence.
As a preferred technical scheme, the device further comprises an economizer, and the air preheater is communicated with the economizer.
As a preferable technical scheme, an outlet of the air preheater is connected with a hot primary air A pipeline and a hot primary air B pipeline, the air preheater is connected with the filter through the hot primary air A pipeline, and the air preheater is connected with the carbon powder burner through the hot primary air B pipeline.
As a preferable technical scheme, the coal-fired boiler is connected with a cold flue gas E pipeline, and the pyrolysis reactor, the induced draft fan and the cold flue gas E pipeline are sequentially communicated.
As a preferable technical scheme, the air preheater is connected with a hot flue gas C extraction pipeline, and is connected with the pyrolysis reactor through the hot flue gas C extraction pipeline; or the economizer is connected with a hot flue gas C extraction pipeline, and the economizer is connected with the pyrolysis reactor through the hot flue gas C extraction pipeline.
Compared with the prior art, the utility model has the following beneficial effects:
(1) The utility model provides a new method for disposing solid waste pyrolysis products, wherein the pyrolysis products are used for boiler combustion heat supply, thereby realizing the three-dimensional treatment of solid waste, and remarkably improving the energy utilization efficiency compared with direct combustion and landfill treatment;
(2) The temperature in the coal-fired boiler is higher, so that dioxin generated by pyrolysis of solid waste can be completely decomposed in the boiler, and other pollutants can reach an ultralow emission standard along with boiler flue gas by utilizing a boiler flue gas purification system, so that pollution-free treatment of the solid waste is ensured;
(3) The utility model only needs to make simple change on the existing thermal power station system, has high reliability, uses hot flue gas as a heat source for pyrolysis gasification reaction, uses steam as drying gas, and has low cost.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
The reference numerals in the drawings and their corresponding names: 11. the device comprises a solid waste bin, 12 parts of a pyrolysis reactor, 13 parts of a flue gas attemperator, 14 parts of an induced draft fan, 15 parts of a washing tank, 16 parts of a screening device, 17 parts of a dryer, 18 parts of a steam attemperator, 19 parts of a ball mill, 21 parts of a coal-fired boiler, 22 parts of an air preheater, 23 parts of an economizer, 24 parts of a gas burner, 25 parts of a carbon powder burner, 26 parts of a slag discharge port, 27 parts of a filter, 31 parts of a hot primary air A pipeline, 32 parts of a hot primary air B pipeline, 33 parts of a hot flue gas C extraction pipeline, 34 parts of a main steam extraction D pipeline, 35 parts of a cold flue gas E pipeline.
Detailed Description
The present utility model will be described in further detail with reference to examples and drawings, but embodiments of the present utility model are not limited thereto.
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is evident that the embodiments described are only some embodiments of the present utility model, but not all embodiments. In the description of the embodiments of the present utility model, the terms "front, rear, upper, lower, left, right, top, bottom, interior, exterior" and the like indicate orientations or positional relationships, which are merely for convenience in describing the present utility model and simplify the description, and do not indicate or imply that the described devices or elements must have a specific orientation or be constructed and operated in a specific orientation, and thus are not to be construed as limitations of the present utility model.
The upper, lower, left, right, etc. orientations in the present utility model are merely for convenience in representing and describing the system, and are not the most suitable arrangements of the present system or apparatus.
Example 1
As shown in fig. 1, the utility model aims to combine the pyrolysis technology of solid waste with the combustion of a boiler, send pyrolysis products of the solid waste to a simply modified coal-fired boiler in a certain way to burn and produce heat, and then reach the ultralow emission requirement through a flue gas purification system of the coal-fired boiler. Meanwhile, the harmless, reduction and recycling treatment of the solid waste are realized efficiently.
In order to achieve the above object, the technical scheme of the present utility model is as follows:
a solid waste pyrolysis and boiler combustion coupling system comprises a solid waste bin 11, a pyrolysis reactor 12, a washing tank 15, a screening device 16, a dryer 17 (preferably a partition type dryer), a ball mill 19 and a coal-fired boiler 21, a flue gas attemperator 13 arranged on a hot flue gas C pipeline, a draught fan 14 arranged at the rear end, a filter 27 arranged on a primary air A pipeline, a steam attemperator 18 arranged on a main steam extraction D pipeline, a gas burner 24 and a carbon powder burner 25 arranged in the middle of the coal-fired boiler 21; in order to improve the combustion efficiency, combustion air of the gas burner 24 and the carbon powder burner 25 is led out from a hot primary air pipeline at the rear end of the air preheater 22 in the flue of the coal-fired boiler 21; the coal-fired boiler 21 is additionally provided with a hot primary air A pipeline 31, a hot primary air B pipeline 32, a hot flue gas C pipeline 33, a main steam extraction D pipeline 34 and a cold flue gas E pipeline 35 returned to the tail flue by the induced draft fan 14.
Further, the hot flue gas C pipeline led out from the flue of the coal-fired boiler 21 is directly led to the pyrolysis reactor 12, the high-temperature flue gas and the solid waste perform dividing wall type heat exchange in a heat conduction and heat radiation mode, and the drying, pyrolysis and gasification processes of the solid waste are realized in a countercurrent mode.
Further, the hot flue gas passes through a flue gas attemperator 13 before entering the pyrolysis reactor 12, and is pulled by a draught fan arranged at the outlet of a flue gas channel of the pyrolysis reactor 12 to obtain proper temperature and pressure.
Further, pyrolysis oil gas and pyrolysis carbon residue generated by the pyrolysis reactor 12 respectively enter a gas burner 24 and a carbon powder burner 25 which are arranged on the coal-fired boiler 21 after being treated to a certain degree, so that stable combustion of pyrolysis products is realized.
Preferably, a filter 27 is provided between the pyrolysis reactor 12 and the gas burner 24 for removing ash particles from the pyrolysis oil gas.
Preferably, a washing tank 15, a screening device 16, a dryer 17 and a ball mill 19 are respectively arranged between the pyrolysis reactor 12 and the carbon powder burner 25, and most ash and inorganic matters are removed after pyrolysis carbon residue passes through the washing tank 15 and the screening device 16.
Further, after the pyrolytic carbon residue passes through the dryer 17, the water content is reduced to a required value of the water content at the inlet of the ball mill 19, and then the pyrolytic carbon residue is crushed and ground into carbon powder by the ball mill 19.
Preferably, the heat source of the dryer 17 is from the main steam extraction D pipeline of the coal-fired boiler 21 and is regulated to a required steam level by a steam temperature and pressure reducer 18, so that the flexibility of the whole system is improved.
Preferably, the steam side outlet of the dryer 17 is communicated with the washing tank 15, and a condensing pipe is arranged for recovering clean condensate to supplement water for the water tank.
The utility model has the following characteristics:
a solid waste pyrolysis and boiler combustion coupling system comprises a solid waste bin 11, a pyrolysis reactor 12, a washing tank 15, a screening device 16, a dryer 17, a ball mill 19 and a coal-fired boiler 21, a flue gas attemperator 13 and an induced draft fan 14 which are arranged on a flue gas C pipeline, a filter 27 arranged on a primary air A pipeline, a steam attemperator 18 arranged on a main steam extraction D pipeline, and a gas burner 24 and a carbon powder burner 25 which are arranged in the middle of the coal-fired boiler 21; wherein combustion air of the gas burner 24 and the carbon powder burner 25 is led out from a hot primary air pipeline at the rear end of the air preheater 22 in the flue of the coal-fired boiler 21; the coal-fired boiler 21 is led out of a hot primary air A pipeline, a hot primary air B pipeline, a hot flue gas C pipeline and a main steam extraction D pipeline, and is led into a cold flue gas E pipeline.
Preferably, the pyrolysis reactor 12 is communicated with the coal-fired boiler 21 through two paths, pyrolysis oil gas is connected with the gas burner 24 through the filter 27, and pyrolysis carbon residue is connected with the carbon powder burner 25 through the washing tank 15, the screening device 16, the partition wall type dryer 17 and the ball mill 19, so that high-efficiency utilization of pyrolysis products of solid wastes is realized.
Preferably, the heat source of the pyrolysis reactor 12 is from a tail flue of the coal-fired boiler 21, and the flue gas after the air preheater 22 or the flue gas after the economizer 23 is selected according to the pyrolysis material property; the flue gas attemperator 13 is arranged on the hot flue gas C pipeline to realize the efficient and stable pyrolysis of the solid waste; the cold flue gas is sent back to the boiler flue by the induced draft fan 14 to reach the emission requirement.
Preferably, the air preheater 22 draws hot primary air a and hot primary air B, wherein the hot primary air a is premixed with the synthesis gas and fed into the gas burner 24, and the hot primary air B carries the carbon powder into the carbon powder burner 25.
Preferably, the heat source of the dryer 17 is steam D extracted from the main steam of the coal-fired boiler 21, and the temperature and pressure of the steam are regulated by a steam temperature and pressure reducer 18 on a steam extraction pipeline; the steam side outlet of the dryer 17 is provided with a condensing pipe, and the steam condensate can be recovered to the washing tank 15 as make-up water.
Example 2
As further optimization of embodiment 1, as shown in fig. 1, on the basis of embodiment 1, this embodiment further includes the following technical features:
referring to fig. 1, a system for coupling pyrolysis of solid waste with combustion of a boiler mainly comprises a pyrolysis part of solid waste and a combustion part of the boiler. The pyrolysis part of the solid waste mainly comprises a solid waste bin 11, a pyrolysis reactor 12, a flue gas attemperator 13, an induced draft fan 14, a washing tank 15, a screening device 16, a dryer 17, a steam attemperator 18 and a ball mill 19; the boiler combustion section mainly includes a coal-fired boiler 21, an air preheater 22, a gas burner 24, and a carbon powder burner 25.
The solid waste bin 11 is a storage bin for pyrolysis raw materials, and the pretreatment degree of the pyrolysis raw materials is different according to the types of the solid waste.
The material inlet of the pyrolysis reactor 12 is connected with the solid waste bin 11, and the middle is conveyed by a conveyor belt or other modes; the pyrolysis reactor 12 is a divided wall pyrolysis reactor, typically in the form of a rotary pyrolysis gasification kiln.
The heat source of the pyrolysis reactor 12 is from the flue gas of the coal-fired boiler 21, and a hot flue gas C extraction pipeline can be arranged behind the tail flue air preheater 22 or the economizer 23 of the coal-fired boiler 21 according to the temperature required by pyrolysis.
The hot flue gas C extraction pipeline is provided with a flue gas attemperator 13 and an induced draft fan 14.
Specifically, the flue gas attemperator 13 can automatically adjust the temperature of hot flue gas according to the type and quantity of solid waste at the inlet of the pyrolysis reactor 12 and the temperature of the outlet at the flue gas side, so as to ensure the normal pyrolysis reaction and the stability of pyrolysis products.
Specifically, the flue gas attemperator 13 and the induced draft fan 14 can be used to adjust the pressure and temperature of the hot flue gas to reduce the deviation from the design parameters of the pyrolysis reactor 12.
Specifically, the induced draft fan 14 guides the cold flue gas E out and returns to the tail flue of the coal burning boiler 21, and then enters the flue gas treatment system together for treatment.
Specifically, the flow of the cold flue gas E at the outlet of the induced draft fan 14 is far lower than the flue gas of the coal-fired boiler 21, and has little influence on the flow of the flue gas of the coal-fired boiler 21.
The solid waste is subjected to pyrolysis gasification reaction in the pyrolysis reactor 12 to generate middle-high temperature pyrolysis carbon residue and synthesis gas, which are respectively led out from two outlets of the pyrolysis reactor 12.
The air for burning the pyrolytic carbon residue and the synthetic gas comes from an air preheater 22 in a flue gas channel of the coal-fired boiler 21, and the burning air is led out from a hot primary air pipeline at an outlet of the air preheater 22, is divided into two streams A and B, and respectively enters a gas burner 24 and a carbon powder burner 25 as burning air of the pyrolytic carbon residue and the synthetic gas.
The hot air drawn from the air preheater 22 has the following functions:
(1) Providing part of heat to ensure the combustion temperature;
(2) The disturbance to the normal combustion of the boiler is reduced;
(3) Preventing tar condensation in the synthesis gas.
After premixing the hot primary air a and the synthesis gas, the hot primary air a flows through a filter 27 to filter most of particulate matters and tar combined with the particulate matters, so that the back-end gas burner 24 is prevented from being blocked.
Further, in order to avoid condensation of pyrolysis tar, electric tracing is further arranged on the outer surface of the pipeline after pyrolysis oil gas enters the hot primary air A pipeline.
The pyrolysis carbon residue is discharged to the washing tank 15 from the bottom of the pyrolysis reactor, and is conveyed to the screening device 16 after passing through the washing tank 15, and the main purposes are water washing, cooling and inorganic matter removal, including masonry, tile, metal and the like.
The rear end of the screening device 16 is provided with a dryer 17, and the pyrolysis carbon residue removes redundant moisture in the dryer 17 to improve the heat value.
The heat source of the dryer 17 is from the steam extraction D of the main steam of the coal-fired boiler 21, and the steam extraction quantity is determined by the treatment quantity and the water content of the pyrolysis residual carbon and is regulated and controlled by a steam temperature and pressure reducer 18.
In particular, the washing tank 15 is arranged at a height lower than the steam side outlet of the dryer 17, and a longer cooling section is arranged between the two sections for recycling clean condensate.
In particular, the washing tank 15 removes a part of ash, heavy metals, chlorine, etc. on the surface of the pyrolytic carbon residue, and then the pyrolytic carbon residue is sent to the sieving device 16 by the conveying device, and at the same time, the washing tank 15 is provided with a periodic drain, and sewage enriched with ash, heavy metals, and chlorine is discharged to a percolate treatment system (not shown).
In particular, the type of screening device 16 is not fixed and is primarily intended to remove a portion of the extraneous water, metals and minerals from the pyrolytic carbon residue.
The pyrolytic carbon residue enters a ball mill 19 after being dried by the dryer 17, is ground into carbon powder, and enters a carbon powder burner 25 to burn after passing through a coal feeding device and being carried by hot primary air B to form carbon powder air flow.
In particular, the surface water content of the pyrolytic carbon residue entering the ball mill 19 is generally less than 10% to ensure continuous and stable operation of the ball mill.
In particular, if the pyrolysis gasification reaction in the pyrolysis reactor 12 is complete, the residual amount of carbon in the pyrolysis residue is small, and the heat value is low, the pyrolysis residue can be directly landfill-treated, and the washing, sieving, drying, grinding and burning processes of the pyrolysis residue are omitted.
Specifically, a natural gas inlet x is provided before the hot primary air a pipeline enters the gas burner 24, a lignite inlet y is provided at the pyrolysis carbon residue inlet of the ball mill 19, and the stable combustion of the gas burner 24 and the carbon powder burner 25 can be ensured by adding natural gas or coal dust due to the difference in the heat value of the synthesis gas and the pyrolysis carbon residue due to the difference in the quality and the pyrolysis gasification degree of the solid waste materials at the inlet of the system.
The coal-fired boiler 21 further comprises the following adjustments by cooperatively treating solid waste with the above-described coupling system:
(1) The chlorine element content in the solid waste plastic, household garbage and other types is high, and the wall surface and the heating surface which are in direct contact with the flue gas generated by burning the synthesis gas and the pyrolysis carbon residue are required to be subjected to corrosion-resistant treatment;
(2) The slag discharge amount is increased to a certain extent compared with that before transformation, and the opening degree of the slag discharge opening 26 can be properly increased according to the slag discharge amount;
(3) The expansion of the flue corresponds to the increase of the flue gas quantity;
(4) A hot primary air adjusting system aiming at the fluctuation of the heat value of the synthesis gas and the pyrolysis residual carbon is newly added;
(5) The hot secondary air and the overfire air are properly increased.
In particular, when the coal-fired boiler 21 is shut down or in emergency shutdown, the syngas may be passed to an emergency combustor (not shown in FIG. 1) for processing.
As described above, the present utility model can be preferably implemented.
All of the features disclosed in all of the embodiments of this specification, or all of the steps in any method or process disclosed implicitly, except for the mutually exclusive features and/or steps, may be combined and/or expanded and substituted in any way.
The foregoing description of the preferred embodiment of the utility model is not intended to limit the utility model in any way, but rather to cover all modifications, equivalents, improvements and alternatives falling within the spirit and principles of the utility model.
Claims (8)
1. The system is characterized by comprising a solid waste pyrolysis part and a boiler combustion part, wherein the solid waste pyrolysis part comprises a solid waste bin (11), a pyrolysis reactor (12), a flue gas attemperator (13), an induced draft fan (14), a dividing wall type dryer (17), a steam attemperator (18) and a ball mill (19); the boiler combustion part mainly comprises a coal-fired boiler (21), an air preheater (22), a gas burner (24) and a carbon powder burner (25); the device comprises a solid waste bin (11), a pyrolysis reactor (12), a flue gas attemperator (13) and an air preheater (22) which are sequentially communicated, wherein the pyrolysis reactor (12), a draught fan (14) and the air preheater (22) are sequentially communicated, the pyrolysis reactor (12), a dividing wall type dryer (17), a steam attemperator (18) and a coal-fired boiler (21) are sequentially communicated, the coal-fired boiler (21), the air preheater (22) and a gas burner (24) are sequentially communicated, the coal-fired boiler (21), the air preheater (22) and a carbon powder burner (25) are sequentially communicated, the pyrolysis reactor (12) is sequentially communicated with the gas burner (24), and the dividing wall type dryer (17), the ball mill (19) and the carbon powder burner (25) are sequentially communicated.
2. The system for coupling pyrolysis of solid waste and combustion of a boiler according to claim 1, further comprising a pyrolysis reactor (12), a washing tank (15), a screening device (16) and a dividing wall type dryer (17) material channel which are sequentially communicated, wherein a steam temperature and pressure reducer (18) and a main steam D steam extraction pipeline (34) are sequentially connected to the heat source inlet side of the dividing wall type dryer (17).
3. The system for coupling pyrolysis of solid waste with combustion of a boiler according to claim 2, further comprising a filter (27), wherein the pyrolysis reactor (12), the filter (27) and the gas burner (24) are in communication.
4. A system for coupling pyrolysis of solid waste and combustion of a boiler according to claim 3, further comprising a ball mill (19), wherein the dividing wall type dryer (17), the ball mill (19) and the carbon powder burner (25) are sequentially communicated.
5. A system for coupling pyrolysis of solid waste with combustion in a boiler according to claim 3 or 4, further comprising an economizer (23), the air preheater (22) being in communication with the economizer (23).
6. The system for coupling pyrolysis of solid waste and combustion of boiler according to claim 5, wherein the outlet of the air preheater (22) is connected with a hot primary air a pipeline (31) and a hot primary air B pipeline (32), the air preheater (22) is connected with the filter (27) through the hot primary air a pipeline (31), and the air preheater (22) is connected with the carbon powder burner (25) through the hot primary air B pipeline (32).
7. The system for coupling pyrolysis of solid waste and combustion of boiler according to claim 1, wherein the coal-fired boiler (21) is connected with a cold flue gas E pipeline (35), and the pyrolysis reactor (12), the induced draft fan (14) and the cold flue gas E pipeline (35) are sequentially communicated.
8. The system for coupling pyrolysis of solid waste with combustion of a boiler according to claim 1, wherein the air preheater (22) is connected with a hot flue gas C extraction pipe (33), and the air preheater (22) is connected with the pyrolysis reactor (12) through the hot flue gas C extraction pipe (33); or, the economizer (23) is connected with a hot flue gas C extraction pipeline (33), and the economizer (23) is connected with the pyrolysis reactor (12) through the hot flue gas C extraction pipeline (33).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118558706A (en) * | 2024-08-05 | 2024-08-30 | 山东诺泰环保科技有限公司 | System, method and use for comprehensive utilization of gasification slag |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118558706A (en) * | 2024-08-05 | 2024-08-30 | 山东诺泰环保科技有限公司 | System, method and use for comprehensive utilization of gasification slag |
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