CN113106250B - Low-energy-consumption low-emission sintering method for multi-component gas medium composite injection - Google Patents
Low-energy-consumption low-emission sintering method for multi-component gas medium composite injection Download PDFInfo
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- 238000005245 sintering Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 34
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- 239000002131 composite material Substances 0.000 title claims abstract description 17
- 238000005265 energy consumption Methods 0.000 title claims abstract description 12
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- 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 abstract 1
- 230000000630 rising effect Effects 0.000 abstract 1
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- 150000002013 dioxins Chemical class 0.000 description 3
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- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
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- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
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Abstract
Description
技术领域technical field
本发明涉及一种烧结方法,特别涉及一种多组分气体介质复合喷吹的低能耗低排放烧结方法,具体涉及一种根据烧结料层不同区段特征和热量需求相应喷吹不同组成的多组分气体介质以实现协同提高燃料燃烧效率,降低固体化石燃料消耗以及减排的方法,属于钢铁冶金领域的烧结行业。The invention relates to a sintering method, in particular to a low-energy-consumption and low-emission sintering method with multi-component gas medium composite injection, in particular to a multi-component injection method with different compositions correspondingly injected according to the characteristics of different sections of the sintered material layer and the heat demand. The invention discloses a method for realizing synergistic improvement of fuel combustion efficiency, reduction of solid fossil fuel consumption and emission reduction by component gas medium, belonging to the sintering industry in the field of iron and steel metallurgy.
背景技术Background technique
烧结作为钢铁工业前端工序,其能耗高、污染负荷大给钢铁工业清洁生产带来严峻的挑战。传统烧结过程中一般采用焦炭、无烟煤等固体化石燃料作为高温过程物理化学反应的热量来源,且其占比高达烧结能耗的75%~80%。大量研究证实,固体化石燃料燃烧是烧结烟气中CO2、SOX产生的重要来源以及NO产生的主要来源。此外,由于固体燃料燃烧不完全,10%~15%的碳转化为CO,造成能源浪费和环境污染。As the front-end process of iron and steel industry, sintering has high energy consumption and heavy pollution load, which brings severe challenges to the clean production of iron and steel industry. In the traditional sintering process, solid fossil fuels such as coke and anthracite are generally used as the heat source for the physical and chemical reactions of the high temperature process, and their proportion is as high as 75% to 80% of the energy consumption of sintering. A large number of studies have confirmed that the combustion of solid fossil fuels is an important source of CO 2 , SO X and the main source of NO in sintering flue gas. In addition, due to incomplete combustion of solid fuels, 10% to 15% of carbon is converted into CO, resulting in energy waste and environmental pollution.
近年来,烧结料面燃气喷吹、水蒸汽喷吹等烧结新技术在铁矿烧结领域因具有良好的节能减排效果而备受关注。烧结料面燃气喷吹技术是一种在降低固体燃料配比的基础上同时向料层中上部喷吹补入气体燃料的技术,该技术能够有效拓宽高温熔融带,增加高温保持时间,避免上部烧结矿带冷却速率过快,在降低固体燃料配比的同时提高烧结矿产质量指标。我国韶钢在烧结料面喷入钢铁厂内富余的焦炉煤气,烧结矿在强度和冶金性能方面得到有效的改善,节约焦粉量 1.69kg/t-s,氮氧化物减少12%,二氧化硫减少6%。JFE钢铁公司向烧结料面喷吹液化天然气,实现减排CO2 60 000t/a。水蒸汽喷吹技术通过向烧结料面喷入一定浓度水蒸汽,可起到促进燃料燃烧和减少CO排放的目的,提高燃料燃烧效率和减少污染物排放的潜力。然而,在这些单种介质喷吹模式下,并不能实现多种污染物种类同时减排,并且减排程度有限。此外,单种介质喷吹技术受到区域局限,提质效果没有得到更大化体现。In recent years, new sintering technologies such as gas injection and steam injection on the sintered material surface have attracted much attention in the field of iron ore sintering due to their good energy saving and emission reduction effects. Sintered material surface gas injection technology is a technology that injects and supplements gas fuel to the middle and upper part of the material layer on the basis of reducing the solid fuel ratio. This technology can effectively widen the high temperature melting zone, increase the high temperature holding time, and avoid the upper part The cooling rate of the sintered ore belt is too fast, and the quality index of the sintered ore is improved while reducing the solid fuel ratio. Shao Steel in my country sprayed the excess coke oven gas in the iron and steel plant on the surface of the sintered material, and the strength and metallurgical properties of the sintered ore were effectively improved, the amount of coke powder was saved by 1.69kg/ts, the nitrogen oxides were reduced by 12%, and the sulfur dioxide was reduced by 6 %. JFE Steel Co., Ltd. sprayed liquefied natural gas on the sintered material surface to reduce CO 2 emissions by 60 000t/a. The steam injection technology can promote fuel combustion and reduce CO emissions by injecting a certain concentration of steam into the sintered material surface, thereby improving the fuel combustion efficiency and reducing the potential of pollutant emissions. However, under these single medium injection modes, simultaneous emission reduction of multiple pollutant types cannot be achieved, and the emission reduction degree is limited. In addition, the single medium injection technology is limited by the region, and the quality improvement effect is not reflected to a greater extent.
发明内容SUMMARY OF THE INVENTION
针对现有的单种介质喷吹技术存在不能实现多种污染物种类同时减排,并且减排程度有限,化石燃料消耗降低能力有限的缺陷,本发明的目的是在于提供一种能够更大程度满足料层不同高度处热量需求,协同提高燃料燃烧效率,进一步降低固体化石燃料消耗,使CO2温室气体及CO、NOX、SOX、二恶因等多种污染物得到有效减排的多组分气体介质复合喷吹的低能耗低排放烧结方法。Aiming at the defects of the existing single medium injection technology that can not achieve simultaneous emission reduction of multiple pollutant types, and the degree of emission reduction is limited, and the ability to reduce fossil fuel consumption is limited, the purpose of the present invention is to provide a more efficient Meet the heat demand at different heights of the material layer, synergistically improve the fuel combustion efficiency, further reduce the consumption of solid fossil fuels, and effectively reduce CO2 greenhouse gases and various pollutants such as CO, NOx , SOx , and dioxins. Low energy consumption and low emission sintering method for composite injection of component gas media.
为了实现上述技术目的,本发明提供了一种多组分气体介质复合喷吹的低能耗低排放烧结方法,该方法是将烧结机内烧结料面从点火结束点至废气温度开始上升点之间的区域依次划分为区域-1、区域-2及区域-3;烧结过程中向区域-1喷吹高燃气比例多组分气体介质、向区域-2喷吹中燃气比例多组分气体介质,以及向区域-3喷吹低燃气比例多组分气体介质。In order to achieve the above technical purpose, the present invention provides a low-energy-consumption and low-emission sintering method with multi-component gas medium composite injection. The area is divided into area-1, area-2 and area-3 in turn; during the sintering process, a multi-component gas medium with a high proportion of fuel gas is injected into the area-1, and a multi-component gas medium with a medium proportion of fuel gas is injected into the area-2. And inject low gas ratio multi-component gas medium to zone-3.
本发明技术方案根据烧结料层从上部至下部存在热量分布逐渐增加的特点,通过调控喷加的多组分复合气体介质的燃气比例,在充分利用料层蓄热效应的前提下实现整体料层热量的均匀分布,有利于降低烧结过程固体燃耗的用量,同时降低污染物排放的综合功能。The technical scheme of the present invention is based on the characteristic that the heat distribution of the sintered material layer gradually increases from the upper part to the lower part, and by adjusting the fuel gas ratio of the multi-component composite gas medium sprayed, the overall material layer heat can be realized on the premise of making full use of the heat storage effect of the material layer. The uniform distribution of sintering process is conducive to reducing the amount of solid fuel consumption in the sintering process, and at the same time reducing the comprehensive function of pollutant emissions.
优选的方案,区域-1、区域-2及区域-3的区域长度比例为:30~50%:20~40%:10~30%。本发明对区域-1、区域-2及区域-3的区域长度比例的划分依据主要是按照烧结料层高度方向≥1200℃的高温保持时间所对应的区域,区域-1的特征为料层≥1200℃的保持时间t≤1.5min,区域-2的特征为料层≥1200℃的保持时间1.5min<t≤3min,区域-3的特征为料层≥1200℃的保持时间t>3min。严格按照改划分区域方式来喷入对应的多组分复合气体介质能够达到最佳的优化燃料燃烧效率以及减少有害成分排放的效果。In a preferred solution, the region length ratios of region-1, region-2 and region-3 are: 30-50%: 20-40%: 10-30%. The division of the area length ratio of area-1, area-2 and area-3 in the present invention is mainly based on the area corresponding to the high temperature holding time in the height direction of the sintered material layer ≥ 1200°C, and the characteristic of area-1 is that the material layer ≥ The holding time at 1200°C is t≤1.5min, the characteristic of zone-2 is that the holding time of the material layer ≥1200°C is 1.5min<t≤3min, and the characteristic of zone-3 is that the holding time of the material layer≥1200°C is t>3min. Injecting the corresponding multi-component composite gas medium strictly according to the method of dividing the area can achieve the best effect of optimizing the fuel combustion efficiency and reducing the emission of harmful components.
优选的方案,所述高燃气比例多组分气体介质的体积百分比浓度为0.2~1%。包括高燃气比例多组分气体介质中可燃组分和助燃组分总体积百分比浓度。In a preferred solution, the volume percentage concentration of the high gas ratio multi-component gas medium is 0.2-1%. Including the total volume percentage concentration of combustible components and combustion-supporting components in a multi-component gas medium with a high gas ratio.
优选的方案,所述中燃气比例多组分气体介质的体积百分比浓度为0.1~0.5%。包括中燃气比例多组分气体介质中可燃组分和助燃组分总体积百分比浓度。In a preferred solution, the volume percentage concentration of the medium gas ratio multi-component gas medium is 0.1-0.5%. Including the total volume percentage concentration of combustible components and combustion-supporting components in the multi-component gas medium with medium gas ratio.
优选的方案,所述低燃气比例多组分气体介质的体积百分比浓度为0.1~0.5%。包括低燃气比例多组分气体介质中可燃组分和助燃组分总体积百分比浓度。In a preferred solution, the volume percentage concentration of the multi-component gas medium with low gas ratio is 0.1-0.5%. Including the total volume percentage concentration of combustible components and combustion-supporting components in the multi-component gas medium with low gas ratio.
优选的方案,高燃气比例多组分气体介质、中燃气比例多组分气体介质以及低燃气比例多组分气体介质均包括可燃组分和助燃组分。In a preferred solution, the multi-component gas medium with high gas ratio, the multi-component gas medium with medium gas ratio and the multi-component gas medium with low gas ratio all include combustible components and combustion-supporting components.
优选的方案,所述高燃气比例多组分气体介质的体积百分比组成为:可燃组分60~80%,助燃组分20~40%;较优选的方案,所述高燃气比例多组分气体介质的组成为:60~80%燃气,0~20%水蒸汽,10~40%氧气。In a preferred solution, the volume percentage of the high gas ratio multi-component gas medium is composed of: 60-80% combustible components, 20-40% combustion-supporting components; in a more preferred solution, the high gas ratio multi-component gas The composition of the medium is: 60-80% gas, 0-20% water vapor, 10-40% oxygen.
优选的方案,所述中燃气比例多组分气体介质的体积百分比组成为:可燃组分30~60%,助燃组分40~70%。较优选的方案,所述中燃气比例多组分气体介质的体积百分比组成为:30~60%燃气,30~60%水蒸汽,5~15%氧气。In a preferred solution, the volume percentage of the multi-component gas medium with the medium gas ratio is composed of: 30-60% of the combustible component, and 40-70% of the combustion-supporting component. In a more preferred solution, the volume percentage of the medium gas ratio multi-component gas medium is composed of: 30-60% fuel gas, 30-60% water vapor, and 5-15% oxygen.
优选的方案,所述低燃气比例多组分气体介质的体积百分比组成为:可燃组分0~30%,助燃组分70~100%。较优选的方案,所述低燃气比例多组分气体介质的体积百分比组成为:0~30%燃气,60~90%水蒸汽,0~10%氧气。In a preferred solution, the volume percentage of the multi-component gas medium with low fuel gas ratio is composed of: 0-30% of the combustible component, and 70-100% of the combustion-supporting component. In a more preferred solution, the volume percentage of the multi-component gas medium with low gas ratio is composed of: 0-30% gas, 60-90% water vapor, and 0-10% oxygen.
本发明技术方案通过逐渐提高区域-1、区域-2及区域-3内喷入的多组分气体介质中助燃组分的比例,一方面可以最大化利用可燃组分均衡料层不同区域热量补加需求的差异,另一方面利用助燃组分的助燃作用,使复合气体介质的作用分别区域-1以供热为主、区域-2以供热和助燃为主、区域-3以助燃为主,起到优化料层热量分布、促进燃料燃烧以及降低污染物排放的综合功能。The technical solution of the present invention gradually increases the proportion of combustion-supporting components in the multi-component gas medium injected in the area-1, area-2 and area-3, on the one hand, it can maximize the use of heat compensation in different areas of the combustible component balanced material layer. On the other hand, by using the combustion-supporting effect of the combustion-supporting components, the role of the composite gas medium is mainly heating in area-1, heating and combustion-supporting in area-2, and combustion-supporting in area-3. , play a comprehensive function of optimizing the heat distribution of the material layer, promoting fuel combustion and reducing pollutant emissions.
优选的方案,所述燃气包括焦炉煤气、高炉煤气、转炉煤气中的至少一种。这些燃气可以来自钢铁企业内部副产物。In a preferred solution, the gas includes at least one of coke oven gas, blast furnace gas, and converter gas. These gases can come from internal by-products of iron and steel enterprises.
优选的方案,所述助燃组分包括钢铁企业内部自产的水蒸汽、氧气中至少一种。所述水蒸汽可以来自于钢铁企业自热电厂、余热回收利用锅炉产生的高温高压、中温中压、低温低压三类蒸汽,氧气来源于钢铁企业内部制氧车间。In a preferred solution, the combustion-supporting component includes at least one of water vapor and oxygen that are self-produced in the iron and steel enterprise. The steam can come from three types of steam of high temperature and high pressure, medium temperature and medium pressure, and low temperature and low pressure generated by self-heating power plants and waste heat recovery boilers of iron and steel enterprises, and the oxygen comes from the internal oxygen production workshop of iron and steel enterprises.
优选的方案,所述高燃气比例多组分气体介质中的水蒸汽为低温低压、中温中压和高温高压三类水蒸汽中的至少一种。In a preferred solution, the water vapor in the high gas ratio multi-component gas medium is at least one of three types of water vapor at low temperature and low pressure, medium temperature and medium pressure, and high temperature and high pressure.
优选的方案,所述中燃气比例多组分气体介质及所述低燃气比例多组分气体介质中的水蒸汽为中温中压和高温高压水蒸汽中的至少一种。In a preferred solution, the water vapor in the multi-component gas medium with medium gas ratio and the multi-component gas medium with low gas ratio is at least one of medium temperature, medium pressure and high temperature and high pressure water vapor.
较优选的方案,所述低温低压水蒸汽特征为:压力P≤2.5MPa,且温度T≤ 400℃;In a more preferred solution, the characteristics of the low-temperature and low-pressure water vapor are: the pressure P≤2.5MPa, and the temperature T≤400℃;
较优选的方案,所述中温中压水蒸汽特征为:压力2.5<P≤6MPa,且温度 400<T≤450℃。In a more preferred solution, the characteristics of the medium-temperature and medium-pressure steam are: pressure 2.5<P≤6MPa, and temperature 400<T≤450°C.
较优选的方案,所述高温高压水蒸汽特征为:压力P>6MPa,且温度T>450 ℃。In a more preferred solution, the characteristics of the high-temperature and high-pressure water vapor are: pressure P>6MPa, and temperature T>450°C.
本发明在区域-2及区域-3喷入温度较高的高温高压、中温中压蒸汽,可以有效利用蒸汽余热以及避免水蒸汽在料层的冷凝。The present invention sprays high-temperature, high-pressure, medium-temperature and medium-pressure steam with relatively high temperature in the zone-2 and zone-3, which can effectively utilize the residual heat of the steam and avoid the condensation of the steam in the material layer.
相对现有技术,本发明技术方案带来的有益之处在于:Relative to the prior art, the benefits brought by the technical solution of the present invention are:
(1)依据烧结料层从上部至下部存在热量分布逐渐增加的特点,调控多组分气体介质喷加浓度和可燃组分的比例,在充分利用料层蓄热效应的前提下实现整体料层热量的均匀分布,有利于降低烧结过程固体燃耗的用量。(1) According to the characteristic that the heat distribution of the sintered material layer increases gradually from the upper part to the lower part, the injection concentration of the multi-component gas medium and the ratio of the combustible components are adjusted, and the heat of the whole material layer can be realized under the premise of making full use of the heat storage effect of the material layer. The uniform distribution is beneficial to reduce the amount of solid fuel consumption in the sintering process.
(2)喷加的复合介质助燃组分主要包括水蒸汽和氧气两种组分,氧气的加入可避免可燃组分燃烧消耗氧气对固体燃料燃烧的不利影响;水蒸汽与炽热固体碳颗粒发生水煤气反应,促进燃料颗粒燃烧,实现固体燃料化学能的高效释放,并通过生成高活性OH自由基将燃烧过程生成的CO氧化生成CO2,在进一步提高燃烧效果的同时降低烧结烟气中CO的排放浓度;复合介质中添加的水蒸汽促进了固体燃料的充分燃烧,并促进高活性氯(氯气)转化为低活性氯(氯化氢),从而减少了从头合成反应形成二噁英所必需的碳源、氯源,有效减少二噁英的排放量。(2) The combustion-supporting components of the composite medium sprayed mainly include water vapor and oxygen. The addition of oxygen can avoid the adverse effects of the combustion of the combustible components and the consumption of oxygen on the combustion of solid fuels; water vapor and hot solid carbon particles generate water gas. reaction, promote the combustion of fuel particles, realize the efficient release of the chemical energy of solid fuel, and oxidize the CO generated in the combustion process to CO 2 by generating highly active OH radicals, which further improves the combustion effect and reduces the emission of CO in the sintering flue gas. concentration; the added water vapor in the composite medium promotes the full combustion of the solid fuel and promotes the conversion of highly active chlorine (chlorine gas) into low active chlorine (hydrogen chloride), thereby reducing the carbon source necessary for the de novo synthesis reaction to form dioxins, Chlorine source, effectively reducing dioxin emissions.
(3)从区域-1至区域-3,逐渐提高助燃组分的比例,一方面可以最大化利用可燃组分均衡料层不同区域热量补加需求的差异,另一方面利用助燃组分的助燃作用,使复合气体介质的作用在区域-1以供热为主、区域-2以供热和助燃为主、区域-3以助燃为主,起到优化料层热量分布、促进燃料燃烧、降低污染物排放的综合功能。(3) From zone-1 to zone-3, gradually increase the proportion of combustion-supporting components. On the one hand, it can maximize the use of combustible components to balance the difference in heat supplementation requirements in different regions of the material layer, and on the other hand, use the combustion-supporting components of combustion-supporting components. The role of the composite gas medium is mainly to provide heating in area-1, heat supply and combustion support in area-2, and combustion support in area-3, which can optimize the heat distribution of the material layer, promote fuel combustion, reduce Comprehensive function of pollutant emission.
(4)从区域-1至区域-3,因烧结料层燃烧带逐步下移,水蒸汽从料面运动至固体燃料燃烧区的时间逐渐延长,依据此特点,本发明调控了不同区域喷吹蒸汽的特点,使得温度较高的高温高压、中温中压蒸汽喷入区域-2、区域-3,可以有效避免水蒸汽在料层的冷凝。(4) From area -1 to area -3, because the burning zone of the sintered material layer gradually moves down, the time for the water vapor to move from the material surface to the solid fuel burning area is gradually extended. According to this feature, the present invention regulates the injection in different areas. The characteristics of steam enable high temperature, high pressure, medium temperature and medium pressure steam to be sprayed into Zone-2 and Zone-3, which can effectively avoid the condensation of water vapor in the material layer.
(5)发明中的复合气体介质均来源于钢铁企业内部自产燃气、水蒸汽、氧气,成本低,经济性优势明显。(5) The composite gas medium in the invention is all derived from the self-produced gas, water vapor and oxygen in the iron and steel enterprise, with low cost and obvious economic advantages.
通过采用本发明提供的方法,可以实现烧结矿成品率提高4~6%、转鼓强度提高4~8%,每吨烧结矿固体燃料消耗量降低6~10kg,CO排放量减少25~40%、 CO2减排18~30%,二噁英减排40~70%,对于钢铁工业绿色制造具有重要意义。By using the method provided by the invention, the yield of sintered ore can be increased by 4-6%, the drum strength can be increased by 4-8%, the solid fuel consumption per ton of sintered ore can be reduced by 6-10kg, and the CO emission can be reduced by 25-40% , CO 2 emission reduction of 18 to 30%, dioxin emission reduction of 40 to 70%, which is of great significance for the green manufacturing of the iron and steel industry.
附图说明Description of drawings
图1为本发明多组分介质复合喷吹的低能耗低排放烧结方法示意图;1 is a schematic diagram of a low-energy-consumption and low-emission sintering method for composite injection of multi-component media according to the present invention;
图中:1-管排Ⅰ;2-管排II;3-管排III;4-给料槽;5-蓖条;6-烟囱;7-除尘器; 8-风箱。In the figure: 1-pipe row I; 2-pipe row II; 3-pipe row III; 4-feed chute; 5-grate bar; 6-chimney; 7-dust collector; 8-bellows.
具体实施方式Detailed ways
下面实例是对本发明的进一步说明,而不是限制发明的范围。The following examples are intended to further illustrate the present invention, but not to limit the scope of the invention.
实施例-1Example-1
按照混匀铁矿59.77%、白云石4.27%、石灰石5.57%、生石灰3.46%、烧结返矿13.85%、高炉返矿9.23%、焦粉3.85%的质量比配料(获得烧结矿化学成分为TFe56.08%、R1.80、MgO1.80%、CaO10.76%),物料经过混合、制粒后,布料到烧结上,在温度1050±50℃的条件下点火1min、保温1min,然后在负压 15kPa条件下进行烧结。将烧结过程从点火结束至废气温度开始上升的区间划分为三个气体介质喷吹区域(示意图见附图-1):区域-1占整个区间的40%,喷入介质总浓度0.8%(70%的焦炉煤气、20%水蒸汽(温度200℃、压力1.57MPa)、10%氧气);区域-2占整个区间的40%,喷入介质总浓度0.4%(40%的焦炉煤气、50%水蒸汽(温度410℃、压力2.76MPa)、10%氧气);区域-3占整个区间的20%,喷入介质总浓度0.3%(20%的焦炉煤气、75%水蒸汽(温度410℃、压力2.76MPa)、 5%氧气)。与增设任何气体介质喷吹的常规烧结(对比例-1)相比,采用本实施例所述的方法后,对烧结指标、污染物减排效果的影响分别如表1、表2所示。According to the mass ratio of mixed iron ore 59.77%, dolomite 4.27%, limestone 5.57%, quicklime 3.46%, sintered ore 13.85%, blast furnace 9.23%, coke powder 3.85% (the chemical composition of sintered ore is TFe56. 08%, R1.80, MgO1.80%, CaO10.76%), after the materials are mixed and granulated, they are placed on the sinter, ignited at a temperature of 1050±50°C for 1min, kept warm for 1min, and then heated under negative pressure. Sintering was carried out under the condition of 15kPa. Divide the sintering process from the end of ignition to the beginning of the rise of the exhaust gas temperature into three gas medium injection areas (see Figure-1 for the schematic diagram): area-1 accounts for 40% of the entire interval, and the total concentration of the injected medium is 0.8% (70 % coke oven gas, 20% water vapor (temperature 200°C, pressure 1.57MPa), 10% oxygen); area-2 accounts for 40% of the entire interval, and the total concentration of the injected medium is 0.4% (40% coke oven gas, 50% water vapor (temperature 410°C, pressure 2.76MPa), 10% oxygen); area-3 accounts for 20% of the entire interval, and the total concentration of the injected medium is 0.3% (20% coke oven gas, 75% water vapor (temperature 410°C, pressure 2.76MPa), 5% oxygen). Compared with the conventional sintering (Comparative Example-1) with any gas medium injection added, after using the method described in this embodiment, the influence on the sintering index and the pollutant emission reduction effect is shown in Table 1 and Table 2, respectively.
实施例-2Example-2
按照混匀铁矿59.77%、白云石4.27%、石灰石5.57%、生石灰3.46%、烧结返矿13.85%、高炉返矿9.23%、焦粉3.85%的质量比配料(获得烧结矿化学成分为TFe56.08%、R1.80、MgO1.80%、CaO10.76%),物料经过混合、制粒后,布料到烧结上,在温度1050±50℃的条件下点火1min、保温1min,然后在负压 15kPa条件下进行烧结。将烧结过程从点火结束至废气温度开始上升的区间划分为三个气体介质喷吹区域(示意图见附图-1):区域-1占整个区间的50%,喷入介质总浓度1.0%(75%的转炉煤气、10%水蒸汽(温度200℃、压力1.57MPa)、 15%氧气);区域-2占整个区间的40%,喷入介质总浓度0.5%(50%的转炉煤气、 45%水蒸汽(温度410℃、压力2.76MPa)、5%氧气);区域-3占整个区间的10%,喷入介质总浓度0.4%(30%的转炉煤气、65%水蒸汽(温度410℃、压力2.76MPa)、 5%氧气)。与增设任何气体介质喷吹的常规烧结(对比例-1)相比,采用本实施例所述的方法后,对烧结指标、污染物减排效果的影响分别如表1、表2所示。According to the mass ratio of mixed iron ore 59.77%, dolomite 4.27%, limestone 5.57%, quicklime 3.46%, sintered ore 13.85%, blast furnace 9.23%, coke powder 3.85% (the chemical composition of sintered ore is TFe56. 08%, R1.80, MgO1.80%, CaO10.76%), after the materials are mixed and granulated, they are placed on the sinter, ignited at a temperature of 1050±50°C for 1min, kept warm for 1min, and then heated under negative pressure. Sintering was carried out under the condition of 15kPa. Divide the sintering process from the end of ignition to the time when the temperature of the exhaust gas begins to rise into three gas medium injection areas (see Figure-1 for the schematic diagram): area-1 accounts for 50% of the entire interval, and the total concentration of the injected medium is 1.0% (75%). % converter gas, 10% water vapor (temperature 200°C, pressure 1.57MPa), 15% oxygen); zone-2 accounts for 40% of the entire interval, and the total concentration of the injected medium is 0.5% (50% converter gas, 45% Water vapor (temperature 410°C, pressure 2.76MPa), 5% oxygen); zone-3 accounts for 10% of the entire interval, and the total concentration of the injected medium is 0.4% (30% converter gas, 65% water vapor (temperature 410°C, pressure 2.76MPa), 5% oxygen). Compared with the conventional sintering (Comparative Example-1) with any gas medium injection added, after using the method described in this embodiment, the influence on the sintering index and the pollutant emission reduction effect is shown in Table 1 and Table 2, respectively.
对比例-1Comparative Example-1
按照混匀铁矿59.54%、白云石4.27%、石灰石5.57%、生石灰3.46%、烧结返矿13.85%、高炉返矿9.23%、焦粉4.08%的质量比配料(获得烧结矿化学成分为TFe56.04%、R1.80、MgO1.80%、CaO10.79%),物料经过混合、制粒后,布料到烧结上,在温度1050±50℃的条件下点火1min、保温1min,然后在负压 15kPa条件下进行烧结。烧结产量指标如表1所示。According to the mass ratio of mixed iron ore 59.54%, dolomite 4.27%, limestone 5.57%, quicklime 3.46%, sintered ore 13.85%, blast furnace 9.23%, coke powder 4.08% (the chemical composition of sintered ore is TFe56. 04%, R1.80, MgO1.80%, CaO10.79%), after the materials are mixed and granulated, they are placed on the sinter, ignited for 1min at a temperature of 1050±50℃, kept for 1min, and then heated under negative pressure. Sintering was carried out under the condition of 15kPa. The sintering yield index is shown in Table 1.
对比例-2Comparative Example-2
按照混匀铁矿59.77%、白云石4.27%、石灰石5.57%、生石灰3.46%、烧结返矿13.85%、高炉返矿9.23%、焦粉3.85%的质量比配料(获得烧结矿化学成分为TFe56.08%、R1.80、MgO1.80%、CaO10.76%),物料经过混合、制粒后,布料到烧结上,在温度1050±50℃的条件下点火1min、保温1min,然后在负压 15kPa条件下进行烧结。将烧结过程从点火结束至废气温度开始上升的区间划分为三个气体介质喷吹区域(示意图见附图-1):区域-1占整个区间的40%,喷入体积百分浓度为0.56%的焦炉煤气;区域-2占整个区间的40%,喷入体积百分浓度为0.16%的焦炉煤气;区域-3占整个区间的20%,喷入体积百分浓度为0.06%的焦炉煤气。与增设任何气体介质喷吹的常规烧结(对比例-1)相比,采用本实施例所述的方法后,对烧结指标、污染物减排效果的影响分别如表1、表2所示。According to the mass ratio of mixed iron ore 59.77%, dolomite 4.27%, limestone 5.57%, quicklime 3.46%, sintered ore 13.85%, blast furnace 9.23%, coke powder 3.85% (the chemical composition of sintered ore is TFe56. 08%, R1.80, MgO1.80%, CaO10.76%), after the materials are mixed and granulated, they are placed on the sinter, ignited at a temperature of 1050±50°C for 1min, kept warm for 1min, and then heated under negative pressure. Sintering was carried out under the condition of 15kPa. Divide the sintering process from the end of ignition to the time when the temperature of the exhaust gas begins to rise into three gas medium injection areas (see Figure-1 for schematic diagram): area-1 accounts for 40% of the entire interval, and the injection volume percentage concentration is 0.56% area-2 accounts for 40% of the entire interval, injecting coke oven gas with a volume percent concentration of 0.16%; area-3 accounts for 20% of the entire interval, injecting coke oven gas with a volume percent concentration of 0.06% Furnace gas. Compared with the conventional sintering (Comparative Example-1) with any gas medium injection added, after using the method described in this embodiment, the influence on the sintering index and the pollutant emission reduction effect is shown in Table 1 and Table 2, respectively.
对比例-3Comparative Example-3
按照混匀铁矿59.66%、白云石4.27%、石灰石5.57%、生石灰3.46%、烧结返矿13.85%、高炉返矿9.23%、焦粉3.96%的质量比配料(获得烧结矿化学成分为TFe56.06%、R1.80、MgO1.80%、CaO10.78%),物料经过混合、制粒后,布料到烧结上,在温度1050±50℃的条件下点火1min、保温1min,然后在负压 15kPa条件下进行烧结。将烧结过程从点火结束至废气温度开始上升的区间划分为三个气体介质喷吹区域(示意图见附图-1):区域-1占整个区间的40%,喷入体积百分浓度为0.16%的水蒸汽(温度200℃、压力1.57MPa);区域-2占整个区间的40%,喷入体积百分浓度为0.20%的水蒸汽(温度410℃、压力2.76MPa);区域-3占整个区间的20%,喷入介质总浓度0.23%的水蒸汽(温度410℃、压力 2.76MPa)。与增设任何气体介质喷吹的常规烧结(对比例-1)相比,采用本实施例所述的方法后,对烧结指标、污染物减排效果的影响分别如表1、表2所示。According to the mass ratio of mixed iron ore 59.66%, dolomite 4.27%, limestone 5.57%, quicklime 3.46%, sintered ore 13.85%, blast furnace 9.23%, coke powder 3.96% (the chemical composition of sintered ore is TFe56. 06%, R1.80, MgO1.80%, CaO10.78%), after the materials are mixed and granulated, they are placed on the sinter, ignited at a temperature of 1050±50°C for 1min, kept warm for 1min, and then heated under negative pressure. Sintering was carried out under the condition of 15kPa. Divide the sintering process from the end of ignition to the time when the temperature of the exhaust gas begins to rise into three gas medium injection areas (see Figure-1 for the schematic diagram): area-1 accounts for 40% of the entire interval, and the injection volume percentage concentration is 0.16% water vapor (temperature 200°C, pressure 1.57MPa); area-2 accounts for 40% of the entire interval, and water vapor with a volume percentage concentration of 0.20% is injected (temperature 410°C, pressure 2.76MPa); area-3 accounts for the entire area 20% of the interval, water vapor with a total concentration of 0.23% of the medium was injected (temperature 410°C, pressure 2.76MPa). Compared with the conventional sintering (Comparative Example-1) with any gas medium injection added, after using the method described in this embodiment, the influence on the sintering index and the pollutant emission reduction effect is shown in Table 1 and Table 2, respectively.
表1不同实施例烧结产量、质量指标Table 1 Sintering yield and quality index of different embodiments
表2不同实施例污染物减排比例/%Table 2 Pollutant reduction ratio/% in different embodiments
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