CN111878835A - Coupling process and system for carbon-containing solid waste combustion utilization and sintering flue gas purification treatment - Google Patents
Coupling process and system for carbon-containing solid waste combustion utilization and sintering flue gas purification treatment Download PDFInfo
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- CN111878835A CN111878835A CN202010858808.9A CN202010858808A CN111878835A CN 111878835 A CN111878835 A CN 111878835A CN 202010858808 A CN202010858808 A CN 202010858808A CN 111878835 A CN111878835 A CN 111878835A
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- 238000005245 sintering Methods 0.000 title claims abstract description 236
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 231
- 239000003546 flue gas Substances 0.000 title claims abstract description 229
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 108
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 83
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 83
- 239000002910 solid waste Substances 0.000 title claims abstract description 79
- 238000000746 purification Methods 0.000 title claims abstract description 72
- 238000010168 coupling process Methods 0.000 title claims abstract description 38
- 238000006243 chemical reaction Methods 0.000 claims abstract description 65
- 238000000034 method Methods 0.000 claims abstract description 44
- 230000008569 process Effects 0.000 claims abstract description 39
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 29
- 230000023556 desulfurization Effects 0.000 claims abstract description 29
- 230000008878 coupling Effects 0.000 claims abstract description 17
- 238000005859 coupling reaction Methods 0.000 claims abstract description 17
- 238000011084 recovery Methods 0.000 claims abstract description 12
- 239000000428 dust Substances 0.000 claims description 33
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- 239000001301 oxygen Substances 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 17
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 29
- 239000003344 environmental pollutant Substances 0.000 description 16
- 231100000719 pollutant Toxicity 0.000 description 16
- 239000000779 smoke Substances 0.000 description 11
- 238000005406 washing Methods 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 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 5
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/46—Recuperation of heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/006—Systems for reclaiming waste heat using a boiler
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a coupling process and a system for carbon-containing solid waste combustion utilization and sintering flue gas purification treatment, wherein the process comprises the following steps: the sintering flue gas generated in the sintering process is taken as combustion-supporting air to be led out; carrying out combustion reaction, desulfurization and denitration reaction on the led-out sintering flue gas and the carbon-containing solid waste; and (3) carrying out heat recovery on the desulfurized and denitrated high-temperature flue gas generated by the combustion reaction, and converging the low-temperature flue gas subjected to heat recovery into a sintering flue gas purification treatment process. The coupling system comprises a sintering system, a sintering flue gas purification treatment system connected with the sintering system and a carbon-containing solid waste combustion utilization system, wherein a sintering flue gas leading-out end of the carbon-containing solid waste combustion utilization system is connected with a downstream end of the sintering system, and a downstream end flue gas converging port of the carbon-containing solid waste combustion utilization system is connected with the sintering flue gas purification treatment system. The invention realizes ultra-clean discharge, effectively recovers heat energy and realizes energy conservation and consumption reduction by coupling the sintering production process and the carbon-containing solid waste combustion process.
Description
Technical Field
The invention belongs to the field of carbon-containing solid waste combustion utilization, and particularly relates to a coupling process and a coupling system for carbon-containing solid waste combustion utilization and sintering flue gas purification treatment.
Background
China takes coal as a main energy source, the annual coal consumption is about 40 hundred million tons at present, and the national coal yield is about 3.5 hundred million tons in 3 months in 2020. 70% of coal in China is utilized by combustion, and a coal-fired power plant, a coal-fired thermal power plant and the like are typically applied. SO is generated in the combustion and utilization process of coal2、NOXDust, and the like, and washing of coal is a preferred choice for reducing coal-fired pollutants. The washing of coal is an important component of clean coal technology, and the ash content and the sulfur content of the coal are reduced through the washing so as to improve the coal quality. The method comprises the following steps: washing and selecting 1 million tons of raw coal, generally reducing SO discharge of fire coal2About 100 to 150 ten thousand tons. In order to further improve the atmospheric quality, the proportion of the washing and dressing coal is gradually increased. The proposal of the action plan for the efficient utilization of coal (2015-2020) is as follows: by 2020, the raw coal dressing rate reaches more than 80%. The coal washing and dressing can generate two kinds of carbon-containing solid wastes of coal gangue and coal slime, and in order to utilize chemical energy in the coal gangue and the coal slime, most of the coal washing and dressing adopts a traditional combustion mode. However, by adopting the traditional combustion mode, the pollutants contained in the carbon-containing solid waste are only transferred but not really eliminated, and the effect of coal washing and dressing is greatly reduced. Increased pollutant emissions can also result if the combustion flue gas is improperly disposed of or becomes spent. In order to reduce the amount of pollutants discharged from coal and carbon-containing solid fuels, it is a first-choice objective to develop a desulfurization and denitrification technology with higher efficiency. However, the above technical route has high cost and high energy consumption, and has a bottleneck in the discharge amount of pollutants.
The huge steel industry in China is possibly coupled and linked with the combustion and utilization of the carbon-containing solid, and the zero emission of the carbon-containing solid waste or the combustion and utilization of coal is possibly realized through the coupled development between a certain procedure of steel production and the combustion of the carbon-containing solid waste. Therefore, it is necessary to subdivide the characteristics of the various processes of steel production and to burn carbonaceous solids embedded in a production unit in which carbonaceous solids are burned, to develop a carbonaceous materialThe solid waste combustion utilizes a flue gas pollution zero emission technology to realize the real purpose of coal washing and dressing. The sintering production is one of the important process units in the modern steel production, and the flue gas volume of a large sintering machine which is well sealed per ton of ore production is 3000 m3. The untreated sintering flue gas contains CO and CO2、N2、O2、SO2、NOX、H2O, dioxin, various dusts and the like, wherein the volume percentage contents are respectively as follows: CO-1%, O2～16%、H2O is 10 percent and dust is 10g/m3The sulfur dioxide content is generally 800-1500 mg/Nm3The content of nitrogen oxides is 100-450 mg/Nm3Dioxin concentration 3ng-TEQ/Nm3. The average temperature of sintering flue gas is 150 ℃, and the physical heat is 195 kJ/Nm3Sintering flue gas CO is 1 percent and flue gas chemical heat is 120 kJ/Nm3. In the sintering plant of the domestic iron and steel company, sintering flue gas is subjected to desulfurization, denitration and dust removal to reach the discharge standard established by the state and then is discharged into the atmosphere. In the purification treatment process of the sintering flue gas, CO contained in the flue gas cannot be treated and is discharged into the atmosphere along with the flue gas. The existing treatment facilities have no obvious effect on eliminating dioxin and can cause pollution to the atmosphere when being discharged to the atmosphere. In addition, the physical heat contained in the sintering flue gas is not effectively utilized from the analysis of the operated sintering production system.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a coupling process and a coupling system for carbon-containing solid waste combustion utilization and sintering flue gas purification treatment, which couple sintering production and carbon-containing solid waste combustion to realize ultra-clean emission of final flue gas, effectively recover heat energy of the carbon-containing solid waste and sintering flue gas, and realize energy conservation and consumption reduction.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the coupling process of carbon-containing solid waste combustion utilization and sintering flue gas purification treatment comprises the following steps:
s1, leading out sintering flue gas generated in the sintering process from the upstream end of the sintering flue gas purification treatment process as combustion-supporting air;
s2, carrying out combustion reaction, desulfurization and denitration reaction on the led-out sintering flue gas and the carbon-containing solid waste;
and S3, carrying out heat recovery on the desulfurized and denitrated high-temperature flue gas generated by the combustion reaction, and merging the low-temperature flue gas subjected to heat recovery into a sintering flue gas purification treatment process.
Preferably, in the above-mentioned coupling process of carbon-containing solid waste combustion utilization and sintering flue gas purification treatment, in step S1, the sintering flue gas extracted as combustion-supporting air is part or all of the sintering flue gas generated in the sintering process.
Preferably, in the above coupling process of carbon-containing solid waste combustion utilization and sintering flue gas purification treatment, the oxygen content of the sintering flue gas led out as combustion air is 12% to 20%.
Preferably, in the above coupling process of carbon-containing solid waste combustion utilization and sintering flue gas purification treatment, the oxygen content of the sintering flue gas led out as combustion-supporting air is 16%.
Preferably, in the above coupling process of carbon-containing solid waste combustion utilization and sintering flue gas purification treatment, in step S2, when the extracted sintering flue gas is subjected to a combustion reaction with carbon-containing solid waste, the process further includes a desulfurization and denitrification reaction performed on the extracted sintering flue gas and high-temperature flue gas generated by the combustion reaction.
Preferably, in the above coupling process of carbon-containing solid waste combustion utilization and sintering flue gas purification treatment, in step S3, before the low-temperature flue gas after heat recovery is merged into a sintering flue gas purification treatment process, the process further includes a dust removal treatment on the low-temperature flue gas after heat recovery, and the sintering flue gas purification treatment process includes desulfurization, denitration, and flue gas purification and dust removal.
On the other hand, the invention also provides a coupling system for carbon-containing solid waste combustion utilization and sintering flue gas purification treatment, the coupling system comprises a sintering system, a sintering flue gas purification treatment system connected with the sintering system, and a carbon-containing solid waste combustion utilization system, a sintering flue gas leading-out end of the carbon-containing solid waste combustion utilization system is connected with a downstream end of the sintering system, a downstream end flue gas converging port of the carbon-containing solid waste combustion utilization system is connected with the sintering flue gas purification treatment system, and the sintering flue gas purification treatment system comprises a sintering desulfurization tower, a sintering denitrification device, a flue gas purification dust remover and a chimney which are sequentially connected along the flow direction of flue gas.
Preferably, in the above coupling system for carbon-containing solid waste combustion utilization and sintering flue gas purification treatment, the sintering system includes a sintering machine, a sintering main flue of the sintering machine is sequentially connected with an electrostatic dust collector, a main exhaust fan and a sintering main flue valve along a flue gas flowing direction, and the sintering flue gas purification treatment system is connected to a downstream end of the sintering main flue valve.
Preferably, in the above coupling system for carbon-containing solid waste combustion utilization and sintering flue gas purification treatment, the carbon-containing solid waste combustion utilization system includes a sintering flue gas leading-out flue connected to the sintering main flue, a sintering flue gas leading-out end of the sintering flue gas leading-out flue is arranged at a position between the main exhaust fan and the sintering main flue valve, the sintering flue gas leading-out flue is sequentially connected with a reaction furnace front valve, a front induced draft fan and a reaction furnace along a flue gas flowing direction, the reaction furnace is connected with a carbon-containing solid waste bin, a desulfurization reaction module and a denitration reaction module are integrated in the reaction furnace, a flue gas exhaust port of the reaction furnace is connected with a combustion back flue, the combustion back flue is connected with a heat collector, a flue gas converging port at a downstream end of the combustion back flue is connected at a position between the sintering main flue valve and the sintering flue gas purification treatment system, and a reaction furnace rear valve is arranged at the position of the combustion rear flue close to the flue gas confluence port at the downstream end of the combustion rear flue.
Preferably, in the above coupling system for carbon-containing solid waste combustion utilization and sintering flue gas purification treatment, along the flue gas flow direction of the flue gas after combustion, a reaction furnace dust remover and a rear induced draft fan are sequentially arranged at the downstream end of the heat collector of the flue gas after combustion.
The invention has the beneficial effects that: 1. The zero emission of carbon-containing solid waste combustion by utilizing smoke pollution is realized, the two processes of sintering production and carbon-containing solid waste combustion are coupled, sintering smoke is used for supporting combustion in a reaction furnace, and partial desulfurization and denitration reactions are realized in the reaction furnace. The flue gas discharged from the reaction furnace enters the existing sintering flue gas purification treatment process for sintering production for secondary treatment after heat extraction and dust removal, so that the final ultra-clean emission of the flue gas is realized. In the whole process production process, no new smoke discharge point is added, and the combustion utilization of the carbon-containing solid waste and the zero emission of smoke pollution are realized from the viewpoint of the total emission.
2. Realizes the coupling of two processes of energy saving and consumption reduction, the combustion utilization of carbon-containing solid wastes and the purification treatment of sintering flue gas, and the CO in the sintering flue gas accounts for 1 percent of the chemical heat and accounts for 120 kJ/Nm3And can be effectively used. Meanwhile, the physical waste heat of the sintering flue gas at the temperature of 150 ℃ can be effectively recovered, and the energy consumption of effective unit heat extraction is reduced.
3. In the reaction furnace, the carbon-containing solid waste and the sintering flue gas are subjected to combustion reaction, and dioxin in the flue gas in the reaction furnace can be thoroughly decomposed, so that the emission of pollutants is further reduced.
Drawings
FIG. 1 is a flow chart of the coupling process of the present invention;
fig. 2 is a schematic structural diagram of the coupling system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be described in detail and completely with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, as shown in fig. 1, the present invention discloses a coupling process of carbon-containing solid waste combustion utilization and sintering flue gas purification treatment, which comprises the following steps:
s1, leading out sintering flue gas generated in the sintering process from the upstream end of the sintering flue gas purification treatment process as combustion-supporting air;
s2, carrying out combustion reaction, desulfurization and denitration reaction on the led-out sintering flue gas and the carbon-containing solid waste;
and S3, carrying out heat recovery on the desulfurized and denitrated high-temperature flue gas generated by the combustion reaction, and merging the low-temperature flue gas subjected to heat recovery into a sintering flue gas purification treatment process.
Specifically, as a preferred embodiment of the present invention, in step S1, the sintering flue gas extracted as the combustion air is part or all of the sintering flue gas generated in the sintering process. The oxygen content of the sintering flue gas led out as combustion air is 12-20%.
Specifically, as a preferred embodiment of the present invention, the oxygen content of the sintering flue gas extracted as combustion air is 16%.
In the invention, the oxygen content of the sintering flue gas led out as combustion air is detected by an oxygen content detector, and when the oxygen content is lower than the oxygen content value, the oxygen can be supplemented. In the present invention, the oxygen content of the sintering flue gas is expressed in terms of volume.
As a preferred embodiment of the present invention, in step S2, the extracted sintering flue gas further includes a desulfurization and denitration reaction performed on the extracted sintering flue gas and the high-temperature flue gas generated by the combustion reaction when the extracted sintering flue gas is subjected to the combustion reaction with the carbon-containing solid waste. In step S3, before the low-temperature flue gas after heat recovery is merged into the sintering flue gas purification treatment process, the method further includes a dust removal treatment performed on the low-temperature flue gas after heat recovery. The sintering flue gas purification treatment process comprises desulfurization, denitration and flue gas purification and dust removal.
On the other hand, the invention also discloses a coupling system for carbon-containing solid waste combustion utilization and sintering flue gas purification treatment. Referring to fig. 2, as shown in the figure, the coupling system includes a sintering system and a sintering flue gas purification treatment system connected to the sintering system. As an improvement of the invention, the coupling system further comprises a carbon-containing solid waste combustion utilization system, a sintering flue gas leading-out end of the carbon-containing solid waste combustion utilization system is connected with a downstream end of the sintering system, and a downstream end flue gas converging port of the carbon-containing solid waste combustion utilization system is connected with the sintering flue gas purification treatment system. The sintering flue gas purification treatment system comprises a sintering desulfurization tower 16, a sintering denitrification device 17, a flue gas purification dust remover 18 and a chimney 19 which are sequentially connected along the flow direction of flue gas.
Further, as shown in fig. 2, the sintering system includes a sintering machine 1, a main sintering flue 2 of the sintering machine 1 is connected with an electrostatic dust collector 3, a main exhaust fan 4 and a main sintering flue valve 15 in sequence along the flow direction of flue gas, and a sintering flue gas purification treatment system is connected at the downstream end of the main sintering flue valve 15.
Specifically, with continuing reference to fig. 2, the carbon-containing solid waste combustion utilization system includes a sintering flue gas outlet flue 5 connected to the sintering main flue 2, and a sintering flue gas outlet end of the sintering flue gas outlet flue 5 is arranged at a position of the sintering main flue 2 between the main draft fan 4 and the sintering main flue valve 15. The sintering flue gas leading-out flue 5 is sequentially connected with a reaction furnace front valve 6, a front induced draft fan 7 and a reaction furnace 8 along the flue gas flowing direction, and the reaction furnace 8 is connected with a carbon-containing solid waste bin 9. A desulfurization reaction module and a denitration reaction module are integrated in the reaction furnace 8, a flue gas outlet of the reaction furnace 8 is connected with a flue 10 after combustion, and a heat collector 11 is connected on the flue 10 after combustion. The downstream end flue gas confluence port of the post-combustion flue 10 is connected to the sintering main flue 2 at a position between the sintering main flue valve 15 and the sintering flue gas purification treatment system. In order to prevent the sintering flue gas in the main sintering flue 2 from flowing back to the post-combustion flue 10 from the post-combustion flue 10 near the flue gas confluence at the downstream end of the post-combustion flue 10, the post-combustion flue 10 is provided with a post-reactor valve 14 near the flue gas confluence at the downstream end of the post-combustion flue 10.
Further, in the preferred embodiment of the present invention, as shown in fig. 2, the flue gas flow direction of the flue gas duct 10 is that the flue gas duct 10 is provided with a reactor dust collector 12 and a rear induced draft fan 13 at the downstream end of the heat collector 11. The front draught fan 7 and the rear draught fan 13 are used as power sources for smoke flowing, the front draught fan 7 can lead out part or all of sintering smoke in the sintering main flue 2 to the sintering smoke leading-out flue 5 from the connecting position of the sintering main flue 2 and the sintering smoke leading-out flue 5 as combustion-supporting air, and then the combustion smoke is led into the reaction furnace 8 through the sintering smoke leading-out flue 5. The extraction amount of the sintering flue gas in the sintering main flue 2 can be controlled through the reaction furnace front valve 6 and the sintering main flue valve 15.
Further, in the preferred embodiment of the present invention, as shown in fig. 2, the sintering flue gas cleaning treatment system comprises a sintering desulfurization tower 16, a sintering denitration device 17, a flue gas cleaning dust remover 18 and a chimney 19 which are connected to the downstream end of the sintering main flue 2 in sequence along the flue gas flowing direction of the sintering main flue 2.
The working process of the invention is as follows: sintering flue gas generated by the sintering machine 1 enters a sintering main flue 2, part or all of the sintering flue gas is led out to a sintering flue gas leading-out flue 5 after passing through an electrostatic dust collector 3 and a main exhaust fan 4, and the led-out sintering flue gas enters a reaction furnace 8 through a reaction furnace front valve 6 and a front induced draft fan 7. The carbon-containing solid waste stored in the carbon-containing solid waste bin 9 also enters the reaction furnace 8. In the reaction furnace 8, the introduced sintering flue gas and the carbon-containing solid waste in the reaction furnace 8 are subjected to combustion reaction, and partial desulfurization and denitration reaction of the flue gas in the furnace is completed in the reaction furnace 8. Then, the flue gas discharged from the reaction furnace 8 enters a flue 10 after combustion, heat exchange is completed through a heat collector 11, and heat in the high-temperature flue gas is absorbed, so that the high-temperature flue gas is changed into low-temperature flue gas. The low temperature flue gas discharged from the heat remover 11 then enters the dust remover 12 of the reaction furnace for dust removal. Then through back draught fan 13, reaction furnace back valve 14, get back to in the sintering gas cleaning processing system that original sintering machine 1 was supporting again, the flue gas that converges to sintering gas cleaning processing system this moment is the flue gas after the combustion reaction in the reaction furnace 1, carbon monoxide content and dioxin content in this flue gas have all been reduced by a wide margin, and the flue gas accomplishes desulfurization, denitration, dust removal in proper order through sintering gas cleaning processing system's sintering desulfurizing tower 16, sintering denitrification facility 17, gas cleaning dust remover 18, discharge by chimney 19 at last. When all the sintering flue gas enters the reaction furnace 8, the sintering main flue valve 15 is completely closed, and the front valve 6 and the rear valve 14 of the reaction furnace are completely opened. When partial sintering flue gas is required to enter the reaction furnace 8, the flow regulation is realized by regulating the opening degrees of the sintering main flue valve 15, the reaction furnace front valve 6 and the reaction furnace rear valve 14. When all sintering flue gas needs to be treated by the original gas purification system, the sintering main flue valve 15 is completely opened, the front valve 6 of the reaction furnace and the rear valve 14 of the reaction furnace are completely closed, the coupling process and the coupling degree can be flexibly adjusted and controlled, the operation and the use are convenient, the equipment cost is low, and the coupling construction cost between the sintering production and the process and the equipment for burning and utilizing carbon-containing solid wastes is low.
To further describe the ultra-clean discharge process of the present invention, the following is a detailed description of the working principle:
the existing combustion utilization of carbon-containing solid wastes such as coal gangue, coal washing slurry and the like generally comprises the steps of entering a boiler for combustion to generate steam, and discharging flue gas after the flue gas is subjected to purification treatment such as desulfurization, denitration, dust removal and the like to reach an ultra-clean discharge standard. At present, the ultra-clean emission standard of the boiler flue gas of the power plant is executed, and the ultra-clean emission index of the boiler flue gas of the power plant is shown in the following table 1:
TABLE 1
| Ordinal number | Parameters of | Single position | Numerical value |
| 1 | Dust concentration | mg/ |
10 |
| 2 | SO2Concentration of | mg/Nm3 | 35 |
| 3 | NOXConcentration of | mg/Nm3 | 50 |
And (4) according to the emission standard, a large amount of pollutants in the flue gas generated after the carbon-containing solid waste is combusted and utilized are discharged into the atmosphere.
And the sintering flue gas generated by the existing steel production sintering process can realize ultra-clean emission after dust removal, desulfurization and denitration treatment. The standard of ultra-clean emission in the prior steel production sintering process is the same as the standard of ultra-clean emission of boiler flue gas in a power plant. In the current practical application, the two production modes are simultaneously carried out in parallel. Wherein, the pollutants discharged to the atmosphere by the flue gas after the carbon-containing solid waste is combusted are as follows: the smoke quantity after the carbon-containing solid waste is combusted is multiplied by the pollutant emission concentration percent. The pollutants discharged to the atmosphere by the sintering flue gas are as follows: the sintering flue gas amount is multiplied by the pollutant emission concentration%. The total amount of pollutants discharged to the atmosphere by the two production modes is as follows: the flue gas amount after the carbon-containing solid waste is combusted is multiplied by the pollutant emission concentration% + the sintering flue gas amount is multiplied by the pollutant emission concentration%.
The invention relates to a coupling process of carbon-containing solid waste combustion utilization and sintering flue gas purification treatment, which is characterized in that all or part of sintering flue gas is used as combustion-supporting air to perform combustion reaction with carbon-containing solid waste such as coal slime, coal gangue and the like in a reaction furnace, chemical energy contained in the carbon-containing solid waste is transferred to high-temperature flue gas, and a heat collector is used for recovering the heat of the flue gas, so that the resource utilization of the carbon-containing solid waste is realized. Meanwhile, in the reaction furnace 1 in which the desulfurization reaction module and the denitration reaction module are integrated, the desulfurization and denitration reactions are also accompanied during the combustion reaction. The flue gas out of the reaction furnace 1 is subjected to heat exchange through a heat collector 11, is dedusted through a reaction furnace deduster 12, then returns to the sintering main flue 2, and enters the sintering system to be subjected to secondary desulfurization, denitrification and dedusting treatment in the original sintering flue gas purification treatment system.
Because of the integrated desulfurization and denitration functions in the reaction furnace and the high-efficiency dust removal of the flue gas out of the reaction furnace through the reaction furnace dust remover 12, the contents of sulfur, nitrate and dust in the part of the flue gas which is converged again and enters the sintering main flue 2 are all lower than those in the original sintering flue gas. Therefore, after passing through the desulfurization, denitration and dust removal device equipped in the original sintering machine, the amount of sulfur, nitrate and dust in the flue gas discharged through the chimney 19 is lower than that of the original flue gas.
Further may be expressed as: the carbon-containing solid waste combustion utilization and the sintering flue gas purification treatment are coupled and linked, the sintering flue gas firstly completes the carbon-containing solid waste combustion utilization in the reaction furnace 1, and then converges and enters an original sintering flue gas purification treatment system of a sintering system for purification treatment. The two processes are coupled to the atmosphere and the pollutants are: the sintering flue gas amount is multiplied by the pollutant emission concentration%. Because the contents of sulfur, nitrate and dust in the flue gas which enters the sintering main flue again after passing through the reaction furnace 1 are all lower than the contents in the original sintering flue gas, the total emission is not increased, which is equivalent to zero emission of flue gas pollution in the combustion and utilization process of carbon-containing solid waste, and the content of carbon monoxide and the content of dioxin in the flue gas are greatly reduced.
Various other changes and modifications to the above-described embodiments and concepts will become apparent to those skilled in the art from the above description, and all such changes and modifications are intended to be included within the scope of the present invention as defined in the appended claims.
Claims (10)
1. The coupling process of carbon-containing solid waste combustion utilization and sintering flue gas purification treatment is characterized in that: the method comprises the following steps:
s1, leading out sintering flue gas generated in the sintering process from the upstream end of the sintering flue gas purification treatment process as combustion-supporting air;
s2, carrying out combustion reaction, desulfurization and denitration reaction on the led-out sintering flue gas and the carbon-containing solid waste;
and S3, carrying out heat recovery on the desulfurized and denitrated high-temperature flue gas generated by the combustion reaction, and merging the low-temperature flue gas subjected to heat recovery into a sintering flue gas purification treatment process.
2. The coupling process of carbon-containing solid waste combustion utilization and sintering flue gas purification treatment as claimed in claim 1, wherein: in step S1, the sintering flue gas extracted as the combustion air is part or all of the sintering flue gas generated in the sintering process.
3. The coupling process of carbon-containing solid waste combustion utilization and sintering flue gas purification treatment as claimed in claim 1, wherein: the oxygen content of the sintering flue gas led out as combustion air is 12-20%.
4. The coupling process of carbon-containing solid waste combustion utilization and sintering flue gas purification treatment as claimed in claim 3, wherein: the oxygen content of the sintering flue gas led out as combustion air is 16%.
5. The coupling process of carbon-containing solid waste combustion utilization and sintering flue gas purification treatment as claimed in claim 1, wherein: in step S2, when the extracted sintering flue gas is subjected to a combustion reaction with the carbon-containing solid waste, the method further includes a desulfurization and denitration reaction performed on the extracted sintering flue gas and the high-temperature flue gas generated by the combustion reaction.
6. The coupling process of carbon-containing solid waste combustion utilization and sintering flue gas purification treatment as claimed in claim 1, wherein: in step S3, before the recovered low-temperature flue gas is merged into the sintering flue gas purification treatment process, the sintering flue gas purification treatment process further includes a dust removal treatment on the recovered low-temperature flue gas, and the sintering flue gas purification treatment process includes desulfurization, denitration, and flue gas purification and dust removal.
7. The coupling system who contains carbon and give up burning utilization and sintering gas cleaning treatment admittedly, including sintering system and connection sintering gas cleaning system of sintering system, its characterized in that: the device is characterized by further comprising a carbon-containing solid waste combustion utilization system, wherein a sintering flue gas leading-out end of the carbon-containing solid waste combustion utilization system is connected with a downstream end of the sintering system, a downstream end flue gas converging port of the carbon-containing solid waste combustion utilization system is connected with the sintering flue gas purification treatment system, and the sintering flue gas purification treatment system comprises a sintering desulfurization tower (16), a sintering denitration device (17), a flue gas purification dust remover (18) and a chimney (19) which are sequentially connected along the flow direction of flue gas.
8. The coupled system for the combustion utilization and sintering flue gas purification treatment of the carbon-containing solid wastes according to claim 7, characterized in that: the sintering system comprises a sintering machine (1), a sintering main flue (2) of the sintering machine (1) is sequentially connected with an electrostatic dust collector (3), a main exhaust fan (4) and a sintering main flue valve (15) along the flowing direction of flue gas, and the sintering flue gas purification treatment system is connected with the downstream end of the sintering main flue valve (15).
9. The coupled system for the combustion utilization and sintering flue gas purification treatment of the carbon-containing solid wastes according to claim 8, characterized in that: carbon-containing solid useless burning utilization system is including connecting sintering flue gas on sintering flue (2) is drawn forth flue (5), and its sintering flue gas is drawn forth the end and is established sintering flue (2) is lieing in owner air exhauster (4) with position department between sintering flue valve (15), sintering flue gas is drawn forth flue (5) and is connected gradually reaction furnace front valve (6), preceding draught fan (7) and reacting furnace (8) along flue gas flow direction, reacting furnace (8) are connected with carbon-containing solid useless storehouse (9), it has desulfurization reaction module and denitration reaction module to integrate in reacting furnace (8), the flue gas discharge port of reacting furnace (8) is connected with back flue (10) of burning, be connected with on back flue (10) and get heater (11), the downstream end flue gas convergent flow mouth of back flue (10) of burning is connected sintering flue (2) is lieing in sintering flue valve (15) with sintering flue And a reaction furnace rear valve (14) is arranged at the position between the flue gas purification treatment systems and close to the downstream end flue gas confluence opening of the combustion flue (10).
10. The coupled system for the combustion utilization and sintering flue gas purification treatment of the carbon-containing solid wastes according to claim 9, characterized in that: along the flue gas flow direction of flue (10) behind the burning, flue (10) behind the burning is located the downstream end of calorimeter (11) is equipped with reacting furnace dust remover (12) and back draught fan (13) in proper order.
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