CN113617807B - Novel waste incineration fly ash pyrolysis system and method - Google Patents
Novel waste incineration fly ash pyrolysis system and method Download PDFInfo
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- 238000000197 pyrolysis Methods 0.000 title claims abstract description 144
- 239000010881 fly ash Substances 0.000 title claims abstract description 121
- 238000004056 waste incineration Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000007789 gas Substances 0.000 claims abstract description 91
- 238000003860 storage Methods 0.000 claims abstract description 31
- 239000000428 dust Substances 0.000 claims abstract description 23
- 238000000746 purification Methods 0.000 claims abstract description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 239000011343 solid material Substances 0.000 claims description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 7
- 238000001179 sorption measurement Methods 0.000 claims description 7
- 229910052786 argon Inorganic materials 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 230000002441 reversible effect Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
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- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 239000007792 gaseous phase Substances 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
- KVGZZAHHUNAVKZ-UHFFFAOYSA-N 1,4-Dioxin Chemical compound O1C=COC=C1 KVGZZAHHUNAVKZ-UHFFFAOYSA-N 0.000 description 13
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- 230000001276 controlling effect Effects 0.000 description 7
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- 150000002013 dioxins Chemical class 0.000 description 2
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- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
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- 238000002844 melting Methods 0.000 description 1
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
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- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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Abstract
The invention discloses a novel waste incineration fly ash pyrolysis system and a method, and relates to the field of electric power and environmental protection. The novel waste incineration fly ash pyrolysis system comprises a feeding temporary storage bin, a pyrolysis furnace, a gas purification and circulation system and a storage bin, wherein the feeding temporary storage bin is used for continuously providing fly ash for the pyrolysis furnace, the fly ash is fully heated in the anaerobic environment in the pyrolysis furnace, the degradation of dioxin is realized, the regeneration of the dioxin is effectively avoided, and the aim of thoroughly removing organic harmful substances is fulfilled. Collect the gas that the pyrolysis in-process produced through gas purification system, carry out effectual enrichment and purification to it, make the flying dust pyrolysis more high-efficient, organic harmful substance falls to lower in the solid residue after the pyrolysis, has also avoided the pollution to the atmospheric environment to can satisfy the needs of the anaerobic environment of pyrolysis oven, reduce the concentration of organic harmful substance in the gaseous phase of pyrolysis oven, improve reaction efficiency.
Description
Technical Field
The invention relates to the technical field of electric power and environmental protection, in particular to a novel waste incineration fly ash pyrolysis system and a novel waste incineration fly ash pyrolysis method.
Background
In recent years, along with the rapid development of economy in China, the urbanization process is accelerated continuously, and in addition, the population is rapidly increased, so that the garbage yield is increased year by year. According to statistics, in 2017, the urban domestic garbage clearing and transporting amount in China is as high as 21520 ten thousand tons. The garbage harmless treatment modes in China mainly include three types: sanitary landfill, incineration power generation and composting. The sanitary landfill needs to occupy a large amount of land resources, along with the rising of land price and the continuous improvement of urban environment requirements, the domestic waste incineration power generation is more and more favored due to the advantages of volume reduction and energy recovery, but the waste incineration can also generate solid waste, bottom slag and fly ash, the waste bottom slag can be treated according to conventional waste, and the fly ash is definitely specified as dangerous waste in many countries including China due to the fact that the fly ash contains high-concentration dioxin and various heavy metals with high leaching concentration.
The yield of the fly ash generated by burning the household garbage is usually 3-10% of the quality of the garbage, and according to the calculation, the fly ash yield in China in 2017 is over 500 ten thousand tons, and currently, the fly ash disposal modes in China mainly comprise: and (4) after the cement is solidified, landfill and cement kiln are cooperatively treated. Although the cement solidification can inhibit the leaching of heavy metals in the fly ash, the cement solidification cannot degrade dioxin in the fly ash, and the solidified fly ash has obvious capacity increase, is not beneficial to transportation and landfill, and does not have the condition of subsequent resource utilization. The cement kiln co-treatment is a main way for recycling the fly ash, but because the chlorine is strictly controlled by cement and the addition amount of the fly ash is very low, the cement kiln co-treatment can only realize the limited recycling of the fly ash. Therefore, the lack of reasonable fly ash disposal technology will inevitably become one of the important factors restricting the development of the waste incineration power generation industry.
Thermal disposal of fly ash is considered to be one of the best methods for degrading dioxin in fly ash, and it has been reported that more than 95% of dioxin in fly ash is degraded after thermal disposal. Traditional thermal treatment methods can be classified into the following three categories: sintering, vitrification, and melting. However, these methods have the following disadvantages: the high-temperature heat treatment has higher requirements on the whole system equipment, higher energy consumption in the heat treatment process and the problem of dioxin regeneration under the aerobic condition.
In view of the above disadvantages of the prior art, it is necessary to develop a continuous, efficient, low energy consumption, and efficient pyrolysis system and method.
Disclosure of Invention
The invention aims to provide a novel waste incineration fly ash pyrolysis system and a novel waste incineration fly ash pyrolysis method, so as to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a novel waste incineration fly ash pyrolysis system which comprises a feeding temporary storage bin, a pyrolysis furnace, a gas purification and circulation system and a storage bin, wherein the feeding temporary storage bin is connected with the pyrolysis furnace; the feeding temporary storage bin is positioned at the upper end of the feeding hole of the pyrolysis furnace, and the pyrolysis furnace is communicated with the gas purification and circulation system through an induced draft fan; the gas purification and circulation system comprises a cyclone dust removal system, an active carbon adsorption system and a bag-type dust remover which are arranged in sequence; the bottom of the pyrolysis furnace is provided with a screw conveyor, and the storage bin is communicated with the pyrolysis furnace through the screw conveyor.
A novel waste incineration fly ash pyrolysis method specifically comprises the following steps:
1) pre-storing fly ash: conveying the fly ash into a temporary feeding bin in a powder conveying mode to prepare feeding;
2) gas replacement: blowing the whole waste incineration fly ash pyrolysis system by using protective gas before the fly ash is sent into the pyrolysis furnace, and discharging air in the waste incineration fly ash pyrolysis system;
3) pyrolysis of fly ash: continuously feeding the fly ash in the feeding temporary storage bin in the step 1) into a pyrolysis furnace, and heating the fly ash under an anaerobic condition;
4) gas purification and circulation treatment: introducing the hot mixed gas in the pyrolysis furnace into a gas purification and circulation system through an induced draft fan, and returning the purified gas into the pyrolysis furnace;
5) collecting the pyrolyzed solid materials: and conveying solid materials generated after the fly ash is pyrolyzed in the pyrolyzing furnace to a storage bin through a screw conveyer.
Preferably, the powder conveying mode in the step 1) adopts a screw conveyor to convey the fly ash from the bottom of the high-level feeding bin to the feeding temporary storage bin at the upper end of the pyrolysis furnace.
Preferably, the powder conveying manner in the step 1) adopts a compressed gas conveying manner to convey the fly ash from the bottom of the high-level feeding bin to the feeding temporary storage bin at the upper end of the pyrolysis furnace.
Preferably, the compressed gas is one or more of argon, nitrogen or other mixed gas, and the other mixed gas is a mixed gas without oxygen component.
Preferably, the protective gas in step 2) is one or more of superheated steam, argon, nitrogen or other mixed gas, and the other mixed gas is a mixed gas without oxygen component.
Preferably, the heat treatment conditions in step 3) are as follows: the temperature of the fly ash in the pyrolysis furnace is between 500 and 800 ℃, the residence time of the fly ash in the pyrolysis furnace is between 1 and 3 hours, and the pressure of a hearth of the pyrolysis furnace is between 0 and 2000 Pa.
Preferably, the purification treatment process in step 4) is as follows: the hot mixed gas passes through a cyclone dust removal system to remove a large amount of dust carried in the hot mixed gas, and the dust collected by the cyclone dust removal system is sent back to the pyrolysis furnace; then the hot mixed gas is sent into an activated carbon adsorption system and a bag-type dust collector in sequence, and the purified mixed gas returns to the pyrolysis furnace.
Preferably, the mixed gas purified in the step 4) is subjected to reverse heat exchange with fly ash in the screw conveyor through the screw conveyor at the bottom of the pyrolysis furnace, and then returns to the pyrolysis furnace, and the purified gas is preheated while the pyrolyzed fly ash is cooled.
Preferably, the screw conveyer in the step 5) adopts a water jacket cooling mode to cool the solid material.
Compared with the prior art, the invention discloses the following technical effects:
1. the waste incineration fly ash pyrolysis system adopts an oxygen-free atmosphere and the pyrolysis furnace adopts micro-positive pressure operation, so that the problem of regeneration of dioxin in the fly ash pyrolysis process can be effectively solved, and the content of dioxin in a pyrolysis solid product and gas can be effectively reduced. In addition, under the condition of medium and low temperature of 500-800 ℃ and certain retention time, dioxin in the fly ash in the pyrolysis furnace can be fully degraded, so that the aim of removing harmful substances in the fly ash is fulfilled;
2. compared with a high-temperature method, the adoption of the medium-low temperature pyrolysis fly ash can not only reduce the energy consumption of the pyrolysis furnace in the reaction process and save the production cost, but also reduce the material specification selected by the pyrolysis equipment and reduce the equipment investment. In addition, the application of the medium-low temperature pyrolysis treatment technology also reduces the failure rate of equipment, so that the fly ash treatment of the medium-low temperature pyrolysis equipment is beneficial to the long-term stable operation of the equipment;
3. the waste incineration fly ash pyrolysis system adopts a gas purification and circulation system to timely purify gas generated by pyrolysis, so that the contact time of waste gas and fly ash in the pyrolysis furnace is reduced, and the content of organic waste in solid materials after pyrolysis is reduced. The circulation of the purified gas ensures the micro-positive pressure operation requirement of the pyrolysis furnace and the anaerobic requirement of the whole system, and further reduces the regeneration problem of dioxin;
4. the waste incineration fly ash pyrolysis system provides guarantee for resource utilization of the fly ash subjected to subsequent pyrolysis treatment by removing dioxin in the fly ash and collecting pyrolyzed solid materials.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a novel waste incineration fly ash pyrolysis system of the present invention;
FIG. 2 is a flow chart of pyrolysis of novel waste incineration fly ash;
wherein, the device comprises a temporary feeding storage bin-1, a pyrolysis furnace-2, a storage bin-3, an induced draft fan-4, a cyclone dust removal system-5, an activated carbon adsorption system-6, a bag-type dust remover-7, a screw conveyor-8, a feeding bin-9, a gas burner-10 and a gas pump-11.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides a novel waste incineration fly ash pyrolysis system which comprises a feeding temporary storage bin 1, a pyrolysis furnace 2, a gas purification and circulation system and a storage bin 3. After the fly ash is conveyed to the feed temporary storage bin 1 in a powder conveying manner, firstly, the whole waste incineration fly ash pyrolysis system is subjected to nitrogen purging by using an air pump 11. Then, the fly ash in the feeding temporary storage bin 1 is continuously sent into the pyrolysis furnace 2, the fly ash is heated in the pyrolysis furnace 2 to ensure that dioxin in the fly ash is degraded and converted into low molecular weight organic components and enters nitrogen in the pyrolysis furnace 2, mixed gas after pyrolysis under the action of the induced draft fan 4 is brought into a subsequent gas purification and circulation system, the mixed gas is sent back into the pyrolysis furnace 2 after purification treatment, and the furnace pressure in the pyrolysis furnace 2 is controlled by regulating and controlling the frequency of the induced draft fan 4. Before the purified mixed gas is returned into the pyrolysis furnace 2, the fly ash in the spiral conveyor 8 and the spiral conveyor 8 at the bottom of the pyrolysis furnace 2 are subjected to reverse heat exchange, and then the purified gas returns to the pyrolysis furnace 2, and the purified gas is preheated while the pyrolyzed fly ash is cooled. Finally, the qualified solid material after pyrolysis treatment is sent to the storage bin 3 under the action of the screw conveyer 8. The cooling degree of the qualified solid materials can be controlled by adjusting the power of a driving motor of the screw conveyor 8, and the cooling is realized by combining a water jacket on the screw conveyor 8.
Example one
The method for treating the fly ash of a certain waste power plant in Shanxi province by utilizing the waste incineration fly ash pyrolysis technology comprises the following steps:
1) pre-storing fly ash: sending the fly ash into a temporary feeding bin 1 by adopting a nitrogen conveying mode, wherein a feeding bin 9 is positioned at the upper end of a feeding hole of a pyrolysis furnace 2 and is ready for feeding;
2) gas replacement: after nitrogen purging and replacement are carried out on the waste incineration fly ash pyrolysis system twice, a pressure maintaining test is carried out on the pyrolysis furnace 2, and the pressure is not obviously reduced within 12 hours;
3) pyrolysis of fly ash: preheating a pyrolysis furnace 2 to 900 ℃, gradually feeding the fly ash in a feeding temporary storage bin 1 into the pyrolysis furnace 2 for heating treatment, heating the fly ash under an anaerobic condition, controlling the temperature of the fly ash in the furnace to be 600 +/-50 ℃ by adjusting the temperature of the pyrolysis furnace 2, controlling the residence time of the fly ash in the pyrolysis furnace 2 to be within 2 hours, and controlling the pressure of a hearth to be 50-500 Pa all the time.
4) Gas purification treatment: the pressure in the pyrolysis furnace 2 obviously rises after reacting for 3 hours, open draught fan 4 and introduce clean system with the gas in the pyrolysis furnace 2, the fly ash that gas collected after cyclone dust removal system 5 directly sends into pyrolysis furnace 2 from the cyclone lower extreme, the gas after the dust removal then sends into active carbon adsorption system 6, nearly 97% of the gas after the processing sends into pyrolysis furnace 2 through gas circulation system, it gets into gas burner 10 after the dust in 7 desorption gases of sack cleaner to remain 3% gas and carries out the atmospheric combustion with the combustible component in the burnt gas.
5) Gas circulation: the fly ash adopted by the implementation of the technology contains a large amount of activated carbon and has high organic matter content, so that the gas generated after the pyrolysis of the fly ash is more than that generated by the conventional fly ash pyrolysis, nearly 3% of gas is discharged outside in the process of the pyrolysis treatment of the fly ash, and 97% of other gas after the purification treatment is returned to the pyrolysis furnace 2 to ensure that the furnace pressure is maintained between 50 and 500 Pa.
6) Collecting the pyrolyzed solid materials: qualified solid materials generated after pyrolysis are conveyed to the storage bin 3 through the screw conveyer 8, and the temperature of the solid materials is reduced to 60-80 ℃ after the solid materials are cooled through the screw conveyer 8.
The whole waste incineration fly ash pyrolysis system continuously operates. The change in toxicity equivalent of dioxin in fly ash before and after pyrolysis is shown in table 1.
TABLE 1 comparative table of toxicity equivalent changes of dioxins before and after treatment
Example two
The method for treating fly ash of a certain waste power plant in Hebei province by utilizing the waste incineration fly ash pyrolysis technology comprises the following steps:
1) pre-storing fly ash: sending the fly ash into a temporary feeding bin 1 by adopting a nitrogen conveying mode, wherein a feeding bin 9 is positioned at the upper end of a feeding hole of a pyrolysis furnace 2 and is ready for feeding;
2) gas replacement: after nitrogen purging and replacement are carried out on the waste incineration fly ash pyrolysis system twice, a pressure maintaining test is carried out on the pyrolysis furnace 2, and the pressure is not obviously reduced within 12 hours;
3) pyrolysis of fly ash: preheating a pyrolysis furnace 2 to 900 ℃, gradually feeding the fly ash in a feeding temporary storage bin 1 into the pyrolysis furnace 2 for heating treatment, heating the fly ash under an anaerobic condition, controlling the temperature of the fly ash in the furnace to be 700 +/-50 ℃ by adjusting the temperature of the pyrolysis furnace 2, controlling the residence time of the fly ash in the pyrolysis furnace 2 to be within 2 hours, and controlling the pressure of a hearth to be 0-200 Pa all the time.
4) Gas purification treatment: pressure fluctuation in the stove is less after 2 reaction 72 hours in the pyrolysis oven, opens draught fan 4 and introduces clean system with the gas in the pyrolysis oven 2, and the fly ash of gas process cyclone 5 back collection directly sends into pyrolysis oven 2 from the cyclone lower extreme in, and the gas after the dust removal sends into activated carbon adsorption system 6, and the gas after the processing is whole to be sent into pyrolysis oven 2 through gas circulation system. When the pressure in the pyrolysis furnace 2 exceeds 200Pa, a small amount of gas is discharged, enters a bag-type dust collector 7 to remove dust in the gas, and is then emptied.
5) A gas circulation system: almost few active carbon and extremely low organic matter content in the fly ash adopted by the implementation of the technology cause that the gas generated after the pyrolysis of the fly ash is less than that generated by the conventional fly ash pyrolysis, so that almost no gas is discharged in the process of the pyrolysis treatment of the fly ash, and all the gas after the purification treatment is returned to the pyrolysis furnace 2 to ensure that the pyrolysis furnace 2 is maintained between 0 and 200 Pa.
6) Collecting the pyrolyzed solid materials: qualified solid materials generated after pyrolysis are conveyed to the storage bin 3 through the screw conveyer 8, and the temperature of the solid materials is reduced to 65-90 ℃ after the solid materials are cooled through the screw conveyer 8.
The whole waste incineration fly ash pyrolysis system continuously operates. The change in toxicity equivalent of dioxin in fly ash before and after pyrolysis is shown in table 2.
TABLE 2 comparative table of toxicity equivalent changes of dioxins before and after treatment
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are only intended to illustrate the preferred embodiments of the present invention, and not to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (7)
1. A novel waste incineration fly ash pyrolysis method is characterized in that a novel waste incineration fly ash pyrolysis system used by the method comprises a feeding temporary storage bin (1), a pyrolysis furnace (2), a gas purification and circulation system and a storage bin (3); the feeding temporary storage bin (1) is positioned at the upper end of a feeding hole of the pyrolysis furnace (2), and the pyrolysis furnace (2) is communicated with the gas purification and circulation system through a draught fan (4); the gas purification and circulation system comprises a cyclone dust removal system (5), an active carbon adsorption system (6) and a bag-type dust remover (7) which are arranged in sequence; a spiral conveyor (8) is installed at the bottom of the pyrolysis furnace (2), and the storage bin (3) is communicated with the pyrolysis furnace (2) through the spiral conveyor (8);
the novel waste incineration fly ash pyrolysis method specifically comprises the following steps:
1) pre-storing fly ash: conveying the fly ash into a temporary feeding bin (1) in a powder conveying mode to prepare for feeding;
2) gas replacement: before the fly ash is sent into the pyrolysis furnace (2), the whole waste incineration fly ash pyrolysis system is purged by using protective gas, and air in the waste incineration fly ash pyrolysis system is discharged;
3) pyrolysis of fly ash: continuously feeding the fly ash in the feeding temporary storage bin (1) in the step 1) into a pyrolysis furnace (2), and heating the fly ash under an anaerobic condition;
4) gas purification and circulation treatment: introducing hot mixed gas in the pyrolysis furnace (2) into a gas purification and circulation system through an induced draft fan (4), and returning the purified gas into the pyrolysis furnace (2);
5) collecting the pyrolyzed solid materials: solid materials generated after the fly ash is pyrolyzed in the pyrolyzing furnace (2) are conveyed to the storage bin (3) through a screw conveyor (8);
the purification treatment process in the step 4) comprises the following steps: the hot mixed gas passes through a cyclone dust removal system (5) to remove a large amount of dust carried in the hot mixed gas, and the dust collected by the cyclone dust removal system (5) is sent back to the pyrolysis furnace (2); then, the hot mixed gas is sequentially sent into an activated carbon adsorption system (6) and a bag-type dust collector (7), and the purified mixed gas returns to the pyrolysis furnace (2);
and 4), the mixed gas purified in the step 4) is subjected to reverse heat exchange with fly ash in the spiral conveyor (8) through the spiral conveyor (8) at the bottom of the pyrolysis furnace (2), and then returns to the pyrolysis furnace (2).
2. The novel waste incineration fly ash pyrolysis method according to claim 1, wherein the powder conveying manner in the step 1) adopts a screw conveyor (8) to convey fly ash from the bottom of the high-level feeding bin (9) to the feeding temporary storage bin (1) at the upper end of the pyrolysis furnace (2).
3. The novel waste incineration fly ash pyrolysis method according to claim 1, wherein the powder conveying manner in the step 1) adopts a compressed gas conveying manner to convey the fly ash from the bottom of the high-level feeding bin (9) to the feeding temporary storage bin (1) at the upper end of the pyrolysis furnace (2).
4. The novel method for pyrolyzing fly ash from waste incineration according to claim 3, wherein the compressed gas is one or more of argon, nitrogen or other mixed gas, and the other mixed gas is a mixed gas containing no oxygen component.
5. The novel pyrolysis method of fly ash from waste incineration of claim 1, wherein the protective gas in step 2) is one or more of superheated steam, argon, nitrogen or other mixed gas, and the other mixed gas is a mixed gas without oxygen component.
6. The novel waste incineration fly ash pyrolysis method according to claim 1, wherein the heat treatment conditions in the step 3) are: the temperature of the fly ash in the pyrolysis furnace (2) is between 500 and 800 ℃, the residence time of the fly ash in the pyrolysis furnace (2) is between 1 and 3 hours, and the pressure of a hearth of the pyrolysis furnace (2) is between 0 and 2000 Pa.
7. The novel method for pyrolyzing fly ash from waste incineration according to claim 1, wherein the screw conveyor (8) in step 5) cools the solid material by water jacket cooling.
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| CN114349452B (en) * | 2021-12-28 | 2022-10-21 | 北科蕴宏环保科技(北京)有限公司 | Efficient fly ash resource utilization system and method |
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