CN101893384A - Method of sintering low temperature waste heat circulation and discharged waste gas reduction and device thereof - Google Patents
Method of sintering low temperature waste heat circulation and discharged waste gas reduction and device thereof Download PDFInfo
- Publication number
- CN101893384A CN101893384A CN2009100517318A CN200910051731A CN101893384A CN 101893384 A CN101893384 A CN 101893384A CN 2009100517318 A CN2009100517318 A CN 2009100517318A CN 200910051731 A CN200910051731 A CN 200910051731A CN 101893384 A CN101893384 A CN 101893384A
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- CN
- China
- Prior art keywords
- sintering
- waste gas
- sintering machine
- circulation
- gas
- Prior art date
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- 238000005245 sintering Methods 0.000 title claims abstract description 160
- 239000002912 waste gases Substances 0.000 title claims abstract description 70
- 239000002918 waste heat Substances 0.000 title claims abstract description 31
- 230000001603 reducing Effects 0.000 title claims abstract description 27
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound 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Abstract
Description
Technical field
The present invention relates to the method and the device thereof of a kind of sintering low temperature waste heat circulation and discharged waste gas reduction.
Background technology
To produce large quantity of exhaust gas in the iron ore sintering production process, as a 495m 2The sintering machine ordinary production time, the exhaust gas discharged amount is up to 1,200,000 standard cubic meter (Nm per hour 3/ h) more than.In addition, contain multiple complex environment pollutant in the sintered discharge gas, as dust, SO 2, NO X, heavy metal (as Cd, Hg, As, Pb etc.), HCl, HF, volatile organic contaminant (VOC), polycyclic aromatic hydrocarbon (PAHs), dioxin persistence organic pollutant (POPs) or the like.Except that improving the dust emission control criterion, new " steel and iron industry atmosphere pollutants emission standards " clearly increased SO in the sinter fume 2, NO XReach the emission control standard of pollutants such as dioxin.
The energy consumption of sintering circuit accounts for iron and steel and produces 10% of total energy consumption, is only second to ironmaking, is second big power consumer that iron and steel is produced.The energy consumption of sintering circuit becomes important component part in the ton steel cost, and the external advanced level of the present sintering circuit of China on average exceeds about 20 kilograms of standard coal/tons (kgce/t), the gap of mini-medium mill is bigger, exceeds about 25kgce/t, and the gap between domestic each factory is also bigger.Therefore, China's sintered, energy saving has a high potential, and realizes that sintering circuit is energy-saving and cost-reducing, to reducing the energy consumption per ton steel that iron and steel is produced, saves production cost, and has profound significance.The sintering circuit energy consumption comprises that solid fuel consumption, power consumption, igniting gas consumption, power (compressed air, steam, water etc.) consume, and wherein, solid fuel consumption accounts for 75%～80%, and power consumption accounts for 13%～20%, and igniting consumes and accounts for 5%～10%.Therefore reduce solid fuel consumption, become the main direction that reduces the sintering circuit energy consumption.
In the residual heat resources that are not utilized effectively as yet, sintering low temperature waste heat is wherein main a kind of.According to the research of sintering thermal equilibrium analysis, the physics heat that sintering main exhaust fan waste gas is taken away closely accounts for about 20～30% of whole sintering process energy consumption, and cooler (circular cooler or straight line cooler) waste gas residual heat accounts for 25%～36% of sintering circuit energy consumption.According to statistics, China's sintering circuit utilization rate of waste heat less than 30% also.China's sintering circuit UTILIZATION OF VESIDUAL HEAT IN only limits to the cooling machine waste gas waste heat, is mainly used in hot gas sintering, hot wind ignition, hot blast insulation, steam boiler, cogeneration, and for the sintering machine flue collector flue gas waste heat recovery utilize domestic also beyond example.For the hot waste gas that sinter cooler produces, to remove outside the used hot blasts such as hot gas sintering, hot wind ignition, hot blast insulation, steam boiler, cogeneration, hot blast also has a large amount of residues, also has a large amount of 100～200 ℃ cooling exhausts to fail to obtain to utilize.
The Chinese invention patent CN101024143C that open day is on August 29th, 2007 discloses a kind of method and device of sinter-smoke circulation collected desulfurizing.This method is to get in the seal closure that part of smoke turns back to sintering machine top to circulate from the sintering machine flue, replenishes the sintering machine needed oxygen that burns simultaneously, and the remainder flue gas is handled the back through desulfurization and discharged.The purpose of this patent is to make SO in the flue gas by sinter fume circulation 2Reach enrichment, so that sintering flue gas desulfurization, this patent does not relate to waste gas heat utilization, especially the low temperature waste gas UTILIZATION OF VESIDUAL HEAT IN of cooler.
Summary of the invention
One of technical problem to be solved by this invention provides the method for a kind of sintering low temperature waste heat circulation and discharged waste gas reduction, and it is recycling to make that sintering low temperature waste heat is able to, and can reduce sintered discharge gas and gross contamination emission.
Two of technical problem to be solved by this invention provides the device of a kind of sintering low temperature waste heat circulation and discharged waste gas reduction.
For solving the problems of the technologies described above, the present invention is achieved through the following technical solutions:
The method of a kind of sintering low temperature waste heat circulation and discharged waste gas reduction is: the flue gas of sintering machine flue collector afterbody bellows is extracted out, after dedusting, enter blender with the hot waste gas of drawing and mix and form heat of mixing waste gas, then heat of mixing waste gas is delivered to the sintering machine bed of material surface sintering that circulates from sinter cooler.Described sinter cooler is circular cooler or straight line cooler.
Further, the method for above-mentioned sintering low temperature waste heat circulation and discharged waste gas reduction also comprises by oxygenating blower fan extraction oxygen and/or air and sends into blender.
Further again, the method of above-mentioned sintering low temperature waste heat circulation and discharged waste gas reduction, also comprise by the auxiliary circulation blower fan and from the air draft flue that sintering machine links to each other with chimney, extract part of smoke, enter the sintering machine fan housing of sintering machine, deliver to sintering machine bed of material surface.
The sinter cooler low temperature waste gas (100～450 ℃) that hot waste gas (100～500 ℃) mating part of sintering machine afterbody bellows (be position, burning point before and after bellows) is not utilized, circulating and recovering as the fuel combustion of sintering process process, heat transfer and the required gas of mass transfer, is realized the purpose of low temperature exhaust heat utilization and waste gas circulation minimizing sintering to sintering machine material bed surface.
Flue gas oxygen content 12%～18% because of the higher bellows of flue collector afterbody several temperature, 100～500 ℃ of temperature, oxygen content is lower, if it is directly returned the chassis charge level sintering that circulates separately, can can cause adverse effect to the burning of the fuel in the bed of material (coke powder or coal dust) because of oxygen content is not enough, thereby cause productivity of sinter to descend.For reaching the purpose of recycling sintering flue collector waste gas residual heat and reducing the flue collector toxic emission total amount that contains multiple pollutant, reduce the discharging of cooler hot waste gas simultaneously, the present invention is when taking the flue collector flue gas recirculation to utilize, must cooperate cooler hot waste gas (oxygen content 21%, 100～450 ℃ of temperature), and under the condition permission, allocate oxygen and/or air into, and promptly circulating flue gas is carried out oxygen enrichment and/or supplemental oxygen, make that the oxygen content in the circulating flue gas reaches (18%～25%) more than 18%.
The device of above-mentioned sintering low temperature waste heat circulation and discharged waste gas reduction, comprise the sintering machine high-temperature flue gas circulation line that links to each other with the sintering machine high-temperature flue, sinter cooler hot waste gas circulation line that links to each other with sinter cooler and the global cycle pipeline that links to each other with the sintering machine fan housing, described sinter cooler hot waste gas circulation line is provided with exhaust gas fan, described global cycle pipeline is provided with blender, and described sintering machine high-temperature flue gas circulation line all links to each other with described blender with described sintering machine high-temperature flue gas circulation line.
Further, described sintering machine high-temperature flue gas circulation line is provided with deduster and flue gas blower fan.
Further, the device of above-mentioned sintering low temperature waste heat circulation and discharged waste gas reduction also comprises the oxygenating blower fan that links to each other with described blender.
Further again, the device of above-mentioned sintering low temperature waste heat circulation and discharged waste gas reduction also comprises the auxiliary circulation duct that is connected between sintering machine air draft flue and the sintering machine fan housing, and described auxiliary circulation duct is provided with the auxiliary circulation blower fan.
Sintering low temperature waste heat technical characterstic recycling and discharged waste gas reduction is based on the principle that a part of hot waste gas is incorporated into the sintering process process once more.When hot waste gas passes through sinter bed once more, because of the auto accumulation heat effect of heat exchange and sinter bed can all be supplied with sinter mixture with the low temperature sensible heat of waste gas, the dioxin in the hot waste gas meanwhile, PAHs, organic pollutions such as VOC are decomposed by fierceness during up to the sintering belt more than 1300 ℃ in by sinter bed, NOx also can be by thermal decomposition by partial destruction by the high temperature sintering band time, although dioxin, PAHs, organic pollutions such as VOC may synthesize again again in the sintering preheating zone, but the waste gas circulation sintering still can significantly reduce the discharging of organic pollution and cut down the toxic emission total amount significantly.
The present invention can reach following beneficial effect:
(1) significantly energy-conservation, can reduce process energy consumption more than 5% (more than about 3kgce/t-s);
(2) significantly reduce sintering exhaust gas discharged total amount, can reduce the waste gas total amount more than 20%, very help environmental protection;
(3) be applied to not equip the sintering machine of waste heat boiler, energy-saving effect will be more remarkable, and can save the waste heat boiler equipment investment;
(4) minimizing significantly of waste gas total amount can significantly alleviate the load of sintering electric cleaner, thereby can significantly improve the sintering environment;
(5) waste gas circulation can significantly reduce the discharging of dioxin in the flue gas (PCDD/PCDF), organic pollutions such as PAHs, VOC;
(6) this waste gas/hot air circulation device systems can be implemented oxygen-enriched sintering technique, thereby can significantly improve productivity of sinter.
Adopt the present invention not only can utilize the low temperature exhaust heat of waste gas, reduce the solid burnup of sintering process, can also reduce sinter fume total emission volumn and gross contamination emission significantly, reduce head electric cleaner and main exhauster load and temperature, and help reducing the main exhauster wearing and tearing.
Sintered discharge gas is recycling not only can significantly to reduce toxic emission total amount and the pollutant discharge amount that sintering process produces, and can reclaim low temperature exhaust heat, saving sintering process energy consumption in the flue gas, has more great energy-saving and emission-reduction and is worth.
Description of drawings
The device schematic diagram of circulation of Fig. 1 embodiment of the invention 1 sintering low temperature waste heat and discharged waste gas reduction;
The device schematic diagram of circulation of Fig. 2 embodiment of the invention 2 sintering low temperature waste heats and discharged waste gas reduction;
The device schematic diagram of circulation of Fig. 3 embodiment of the invention 3 sintering low temperature waste heats and discharged waste gas reduction;
Fig. 4 sintered discharge gas temperature of the present invention and dioxin (PCDD/F) are along the Changing Pattern figure of sintering machine length;
Fig. 5 sintered discharge gas temperature of the present invention, NOx, SO 2In Changing Pattern figure along sintering machine length.
Wherein, the concrete implication of each Reference numeral is as follows among Fig. 1,2,3:
Batch mixer 101, sintered compound hopper 102, ignition furnace 103, sintering pallet 104, sintering machine fan housing 105, electric cleaner 106, air draft flue 107, sintering machine main exhaust fan 108, sintering machine afterbody bellows 109, triple valve 110, go back to skirt road 111, waste heat boiler 201, central cooler fan housing 202, central cooler bellows 203, central cooler air blast 204, circular cooler trolley 205, chimney 3, high-temperature flue 4, deduster 5, flue gas blower fan 6, exhaust gas fan 7, blender 8, oxygenating blower fan 9, auxiliary circulation blower fan 10.
The specific embodiment
Shown in Fig. 1,2 or 3, sintering machine system comprises batch mixer 101, sintered compound hopper 102, ignition furnace 103, sintering pallet 104, sintering machine fan housing 105, electric cleaner 106, air draft flue 107, sintering machine main exhaust fan 108, sintering machine afterbody bellows 109.
Shown in Fig. 1,2 or 3, the central cooler system comprises waste heat boiler 201, central cooler fan housing 202, central cooler bellows 203, central cooler air blast 204, circular cooler trolley 205.
Embodiment 1:
As shown in Figure 1, long-pending at a table top is 132m 2Sintering machine on, (this sintering machine is equipped with 1 main exhaust fan, and main smoke evacuation tolerance is 469390Nm 3/ h), with the higher temperature flue gas in the sintering machine afterbody bellows 109 (100～450 ℃, 100000Nm 3/ h) extract from high-temperature flue 4, draw for 6 times by deduster 5 and flue gas blower fan, with the hot waste gas (300000Nm that extracts by exhaust gas fan 7 from circular cooler 3/ h is more than 150 ℃) enter blender 8 and mix after, enter in the sintering machine fan housing 105 of sintering machine, deliver to sintering machine bed of material surface, realize the waste gas circulation sintering.
The exhaust gas volumn that extracts the sintering machine wind box of sintering machine afterbody is that flue-gas temperature surpasses all flue gases more than 100 ℃ in the afterbody bellows, be about to flue-gas temperature and all circulate greater than 100 ℃ waste gas, its exhaust gas volumn accounts for about 10%～20% of the total exhaust gas volumn of sintering machine main exhaust fan.
The ratio of the hot waste gas amount that cooler is drawn and the exhaust gas volumn of sintering machine afterbody bellows is determined by oxygen content in the mix waste gas and temperature, finally reaches oxygen content in the circulation mixed flue gas more than 18%, and temperature is more than 100 ℃.
This embodiment can make sintering main exhaust fan exhaust gas discharged total amount minimizing 10%～20%, central cooler discharge amount of exhaust gas reduce 30%, and sintering deposit per ton can save energy 3.0～4.5kgce/t-s.
Embodiment 2:
As shown in Figure 2, long-pending at a table top is 450m 2Sintering machine on, (this sintering machine is equipped with 2 main exhaust fans, and every typhoon machine exhaust gas volumn is 21000m 3/ min), in fume centralized to a large flue that temperature in the sintering machine afterbody bellows 109 is higher, promptly extract from high-temperature flue 4, draw for 108 times by electric cleaner 106 and sintering machine main exhaust fan, through behind the triple valve 110, pass through go back to skirt road 111 again, after the three strands of gases of hot waste gas from circular cooler that extract oxygen by oxygenating blower fan 9, extract by exhaust gas fan 7 enter blender 8 jointly and mix, enter in the sintering machine fan housing 105 of sintering machine, deliver to sintering machine bed of material surface, realize the waste gas circulation sintering.Utilize triple valve 110 can realize that circulating flue gas is to the direct discharging of chimney 3 when abnormal.
Among the present invention, utilize 1 conduct in 2 main exhaust fans to return air-introduced machine, and utilize original electric cleaner, can make full use of original system equipment, reduce equipment investment.Introduce oxygen by the oxygenating blower fan, make oxygen enrichment in the circulating flue gas.Oxygen enrichment helps improving productivity of sinter.The situation of present embodiment is that the oxygenerator ability of these steel plant is more than needed, and oxygen has more than needed, and the sintering that is used to circulate not only can improve productivity of sinter but also can solve oxygen problem more than needed.
This embodiment can make sintering main exhaust fan exhaust gas discharged total amount minimizing 20%～50%, central cooler discharge amount of exhaust gas reduce 30%, and sintering deposit per ton can save energy 3.5～5.0kgce/t-s, and productivity of sinter improves more than 6%.
Embodiment 3:
As shown in Figure 3, long-pending at a table top is 132m 2Sintering machine on (1 main exhaust fan of system disposition), the air draft flue 107 that links to each other with chimney 3 from sintering machine extracts part of smoke by auxiliary circulation blower fan 10, enter in the sintering machine fan housing 105 of sintering machine, deliver to sintering machine bed of material surface, form auxiliary circulation duct.
The higher temperature flue gas of sintering machine wind box 109 afterbodys is extracted from high-temperature flue 4, draw for 6 times by deduster 5 and flue gas blower fan, after the three strands of gases of hot waste gas from circular cooler that extract oxygen by oxygenating blower fan 9, extract by exhaust gas fan 7 enter blender 8 jointly and mix, enter in the sintering machine fan housing 105 of sintering machine, deliver to sintering machine bed of material surface, realize the waste gas circulation sintering.
This embodiment can make sintering main exhaust fan exhaust gas discharged total amount reduce 20%～40%, and sintering deposit per ton can save energy 3.0～4.5kgce/t-s.
In the present invention, the flue-gas temperature of sintering machine afterbody bellows (being before and after the position, burning point) is higher, surpasses 100 ℃, and the flue-gas temperature of all the other bellows all is lower than 80 ℃.In the sintering bellows waste gas dioxin (PCDD/F) and EGT along the Changing Pattern of sintering machine length as shown in Figure 4, near the position, burning point, the bellows EGT peaks, meanwhile the content of PCDD/F is also the highest, both Changing Pattern unanimities.
NOx, SO 2With EGT etc. along the Changing Pattern of sintering machine length as shown in Figure 5.SO 2Similar with EGT along the Changing Pattern of sintering machine length, promptly reach the highest at sintering afterbody burning point bellows.The variation of NOx does not then have this rule.
Therefore, the flue gas of sintering machine afterbody bellows is selected in the extraction of flue gas of the present invention.
Undoubtedly, the present invention can also have multiple conversion and remodeling, is not limited to the specific embodiment of above-mentioned embodiment.In a word, protection scope of the present invention should comprise those conspicuous to those skilled in the art conversion or substitute and change shape.
Claims (7)
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| CN102022914A (en) * | 2010-12-08 | 2011-04-20 | 江阴兴澄特种钢铁有限公司 | Self-cyclic utilization device for sinter machine tail smoke and tail wind box smoke |
| CN102188905A (en) * | 2011-05-11 | 2011-09-21 | 宝钢工程技术集团有限公司 | Low-carbon method for improving emission reduction efficiency of oxynitride in circulated flue gas from sintering machine |
| CN102808080A (en) * | 2011-05-30 | 2012-12-05 | 宝山钢铁股份有限公司 | Method for increasing waste gas circulation sintering utilization coefficient and sintered ore barrate strength |
| CN102901365A (en) * | 2011-07-27 | 2013-01-30 | 宝山钢铁股份有限公司 | Low-energy-consumption method for reducing emission of dioxin in sintering waste gas |
| CN102997697A (en) * | 2012-12-12 | 2013-03-27 | 武汉钢铁(集团)公司 | Sinter waste-heat utilization process based on purification of sintering flue gas |
| CN103344114A (en) * | 2013-05-08 | 2013-10-09 | 宁波钢铁有限公司 | Novel energy-saving emission-reduction sintering machine system and sintering method |
| CN103375997A (en) * | 2012-04-28 | 2013-10-30 | 宝山钢铁股份有限公司 | Method for regulating and controlling circulating flue-gas temperature and oxygen content |
| CN103499216A (en) * | 2013-09-26 | 2014-01-08 | 中南大学 | Iron mine sintering flue gas segmented circulation method |
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| CN103925808A (en) * | 2014-05-05 | 2014-07-16 | 南京凯盛开能环保能源有限公司 | Smoke waste heat efficient recycling system and method of sintering machine |
| CN103954139A (en) * | 2014-04-03 | 2014-07-30 | 上海交通大学 | Sintering complementary energy power generation system |
| CN104034175A (en) * | 2014-06-11 | 2014-09-10 | 中冶北方（大连）工程技术有限公司 | Energy-saving and emission-reducing type sintering process |
| CN104061794A (en) * | 2014-05-29 | 2014-09-24 | 宁波钢铁有限公司 | Sintering air bellow exhausting gas waste heat circulating utilization device and method |
| CN104195326A (en) * | 2014-08-19 | 2014-12-10 | 浙江大学 | Sintering energy-saving technique and system capable of removing multiple pollutants |
| CN105311907A (en) * | 2014-12-05 | 2016-02-10 | 李正福 | Combined dust removing device and method for sintering machine head |
| CN105468799A (en) * | 2014-09-03 | 2016-04-06 | 宝山钢铁股份有限公司 | Simulation method used for predicting heat condition parameter of high-temperature waste gas circulation sintering process |
| CN106610230A (en) * | 2015-10-27 | 2017-05-03 | 宝山钢铁股份有限公司 | Sintering flue gas reduction and waste heat comprehensive utilization method and device |
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| CN102188905A (en) * | 2011-05-11 | 2011-09-21 | 宝钢工程技术集团有限公司 | Low-carbon method for improving emission reduction efficiency of oxynitride in circulated flue gas from sintering machine |
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Application publication date: 20101124 |