• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The method of sintering agglomeration alloy, including a two-layer load, in which the sintered charge is loaded into the upper layer and granulated material into the lower layer on the grate to separate harmful gaseous substances from the flue gases, the size of which is comparable to the size of the blast furnaces, which are comparable to the size of the blast furnaces. , in order to improve the efficiency of desulfurization of waste gases, granular material, which is used as iron-containing products, is moistened before loading i onto pallets lime slurry in the amount of 0.5-5.0% of the mass of the processed material.
    公开号:SU1156603A3
    申请号:SU813260550
    申请日:1981-03-23
    公开日:1985-05-15
    发明作者:Гребе Клаус；Петер Штрикер Курт
    申请人:Маннесманн Аг (Фирма)；
    IPC主号:
    专利说明:

    This invention relates to metallurgy, in particular to the preparation of ores for smelting.
    The use of solid fuels in the sintering process has the disadvantage that the resulting diesel gases contain oxide sulfur compounds, mainly sulfur dioxide (SOj), resulting from the presence of sulfur in the starting product. The concentration of sulfur in the waste sinter gas is significantly lower than in the waste gas from power plants, but in modern sinter plants, for example, with a capacity of 5 million tons. agglomerate per year, sulfur emission (with a specific fuel consumption of 55 kg / ton of finished agglomerate and sulfur content in solid fuel of about 1%) is still 1200 kg / h or 1.85 kg SOt / T agglomerate.
    Therefore, with an increase in the productivity of sinter plants, the possibility of limiting the concentrations of harmful substances in the product being produced and, above all, emissions 502 should be considered.
    Methods are known for desulfurizing flue gases by scrubbing SOz Cl3 from them or by sorption drying.
    However, such desulfurization methods
    Flue gases when considering them in combination with sinter plants are problematic for a number of reasons.
    Sintering produces a very large amount of waste gases with a low content of SOj and with a very low temperature, which requires a very large expenditure on equipment, the ratio of which to the amount of harmful substances actually removed is unfavorable compared to the same ratio for power plants because of the low hazardous content. In addition, when applying the wet treatment method, an own water supply unit is required, as well as additional heating of gases, which raises issues related to environmental protection. When dry sorption is used, agglomeration gases, which, along with a low concentration of ZOg. they also have a low temperature that would need to be warmed up, which is caused by the laws of reaction kinetics, or it would be necessary to increase the reaction zone n opp: hfm by a specified amount.
    The closest approach is to a zhigic essence and attained) .1 Invention to the invention is the method of sintering di of the chromogenic charge, cf. J) a double-wound load, in which the upper layer is loaded with sintered charge, and n the bottom layer onto the grate - granulated material for separated 11 gaseous vesheslv from smoke lawn, the size of the granules which is commensurate with the size of the blast furnace charge 2
    The disadvantage of this method is the use of limestone as a granular material, which reduces the productivity of sintering machines and the efficiency of cleaning of aggloats from harmful sources.
    The purpose of the invention is to increase the efficiency of desulfurization of waste gases.
    The goal is achieved by the method of sintering the sintering mixture, including a two-layer load, in which a sintered charge is loaded into the upper layer and a granular material into the lower layer into the grate to separate the harmful gaseous substance from the eighth gases, the size of the granules is comparable with the size of the house material. , granulated material, in which quality iron-containing products are used, is moistened with lime pulp in the amount of 0.5-5.0% by weight of vol. before loading onto pallets driver running material.
    With the invention, it is possible to desulfurize the waste gases on the sintering belt. To do this, instead of the standard batch (usually 2-3 cm thick), which is applied to the grate bars of the sintering belt, as well as protects them from the effects of thermal stress and prevents sieving of the thin mixture components, a layer of lumpy mixture a greater thickness of materials suitable for the blast furnace process (pellets, pieces of ore, LD slags, ready agglomerate - is a charge intended for processing). The thickness of the layer of additional flooring can be chosen between the maximum height of the pallets of the sintering machine and the thickness of the layer of sintering
    SI. In the case of heights - plots of LO cm, the height of the working layer of the charge in the automatic installation of the AO cm (including the charge layer on the grates), the reaction zone is approximately 13 cm. for which lime milk is used. Despite the complete lack of desulfurization agents when wetted and the small extent of the reaction zone (several centimeters compared to flue gas desulfurization plants), a significant effect of desulfurization is achieved,
    EXAMPLE 1 A layer of sinter or iron ore pellets is loaded onto the grate, which is first moistened with milk of lime and then with: lavat. When the thickness of the agglomerate layer is 7.5 cm, in which, after treatment with lime milk, there was 3.8% Ca (OH), 730 g SOj per ton of obtained agglomerate is obtained, which corresponds to a desulfurization degree of 49.3%. This means that for an agglomeration belt with an area of AOO with a capacity of 580 g sinter / h, 6 tons of desulfurizing charge and 4.4 tons of calcium hydroxide should be used.
    With a layer of the mixture of pellets of 15 cm, impregnated with 4.1% Ca (OH), 390 g of 50 g / ton of sinter was found in the sinter gas, which corresponds to a degree, or desulfurization of 72.9%.
    If the proportion of moistened Ca (OH) j is increased to 5%, the degree of desulfurization is 52.2%; however, if at the same thickness of the layer the content of deposited Ca (OH) is reduced to 0.5%, desulfurization is 37%.
    The described intensive desulfurization with the use of a mixture of iron ore, pellets, slags or finished agglomerate, which was moistened or processed with the main carriers, was confirmed by experiments using different basic carriers. At the same time, such favorable temperature conditions are created from time to time directly inside the sintered mixture, and such a composition of gas is obtained for intensive desulfurization, using which a high ratio of 66034 is achieved over a small length of the reaction zone (5-15 cm)
    separation rate corresponding to the coefficient in special plants for gas desulfurization, and the average degree of separation can be measured by 5 without the introduction of additives.
    All this leads not only to a decrease in the SOj content in the flue gases, but also to a decrease in the gaseous chlorides and fluorides contained in the sintering exhaust gases in an insignificant amount.
    The presence of a layer of charge bonding the grate, which absorbs harmful substances directly inside
    5, the mixture undergoing agglomeration has almost no effect on the sintering process. Due to the coarse-grain structure of the processing layer, the pressure losses in it are insignificant, for example, with a thickness of 15 cm and a constant resolution, the power loss is 2.5%. In large installations with a constant amount of feed material this
    5, the effect is automatically smoothed.
    Thus, according to the invention, when used, it usually has: a state reserve of height in the pallets of an sinter plant allows you to crucify significant de-sludge from sinter flue gases without significant costs. Not removing emissions, you can use sulfur-rich raw materials, or you can increase plant capacity by increasing fuel consumption without adversely affecting the sintering process.
    In addition, with the increased emission of SOj. As a result of an increase in the specific productivity of the agglomeration, the degree of separation SOj can also be achieved. Since, with a given suction area, an increase in the power of the installation is generally achieved only with a decrease in the height of the mixture layer, in this case, for the charge used for desulfurizing gases, the pallet is higher.
    0 In this case, part of the taggla that is discharged from the flue gases is consumed to heat the bed of charge used for desulfurization. As a result, the resistance of the snow grapes increases. Lower exhaust gas temperature results in lower flow through the exhauster. Thus, since the refrigerator is transferred to a greater number 1156603
    amount of heat due to costsWhen working with a wetted layer
    waste gases, in the case of re-charge, designed for desulfurization, waste from refrigeration increases moisture content
    heat is directed to the agglomeration waste gases due to this
    a process that increases efficiency5 improves the degree of dust collection in
    use of energy in the method. Electrofilter.
    权利要求:
    Claims (1)
    [1]
    METHOD OF SINTERING OF Agglomeration charge, including a two-layer loading, in which a sintered charge is loaded into the upper layer, and granular material is separated into the lower layer on the grate to separate harmful gaseous substances from flue gases, the granule size of which is comparable with the size of the blast furnace charge fractions, which differs that, in order to increase the efficiency of desulphurization of the exhaust gases, the granular material, which is used as iron-containing products, is wetted with lime before loading onto pallets oh pulp in an amount of 0.5-5.0% by weight of the treated material.
    SU W, 1156605
    1 15 660 '3
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    同族专利:
    公开号 | 公开日
    EP0039305A1|1981-11-04|
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    JPS56169732A|1981-12-26|
    AU6942081A|1981-10-29|
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE19803016496|DE3016496C2|1980-04-25|1980-04-25|Process for reducing pollutant emissions during sintering|
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