尿素法同步抑制烧结过程二氧化硫、氮氧化物、二噁英排放及其耦合作用机理

项目名称： 尿素法同步抑制烧结过程二氧化硫、氮氧化物、二噁英排放及其耦合作用机理

项目编号： No.U1260101

项目类型： 联合基金项目

立项/批准年度： 2013

项目学科： 冶金与矿业学科

项目作者： 龙红明

作者单位： 安徽工业大学

项目金额： 50万元

中文摘要： 烧结工序是二氧化硫（SO2）、氮氧化物（NOx）和二噁英（PCDD/Fs）的主要排放源。烧结烟气量大、流量波动大以及污染物浓度低是制约烧结污染物有效脱除的关键因素。本研究提出在烧结混合料中配入一定比例的尿素，利用烧结自身的热力学条件，通过尿素的物理化学反应，在烧结过程中建立起同步抑制SO2、NOx、PCDD/Fs三种污染物向烟气中排放的有效屏障，同时反应产物 (NH4)2SO4固体颗粒在抽风负压的作用下，在料层的高温到来之前与烧结料层分离，附着在粉尘上被除尘器捕集，避免进入烟气形成二次污染。通过调整技术参数，探寻尿素法同步抑制烧结SO2、NOx、PCDD/Fs排放的内在规律及减排效果间的耦合作用机理，将烧结烟气污染物减排由末端治理转变为过程控制，高效率、低成本、同步地解决烧结烟气的SO2、NOx、PCDD/Fs三大污染问题，为“十二五”钢铁工业的清洁生产和可持续发展提供理论基础和技术支撑。

中文关键词： 铁矿粉烧结；污染物减排；尿素；脱硫脱硝；二噁英

英文摘要： Sintering process is the main emission sources of SO2, NOx, PCDD/Fs. The key factors that restrict the effective removal of sintering pollutants are the large quantity of sintering gas, the big flow rate fluctuation and the low pollutant concentration. A method of adding a certain proportion urea in sintering mixture materials was proposed. Under the sintering thermodynamic conditions, an effective barrier which inhibits the emission of SO2, NOx and PCDD/Fs can be built synchronously in sintering process by the physic-chemical reaction of urea. At meantime, under the action of negative pressure, the reaction product (NH4)2SO4 solid particles were separated with sintering bed before the bed temperature increasing and trapped by precipitator after them attaching to the dust, which separate from exhaust gas and avoid the formation of secondary pollution. By adjusting the technical parameters, reveal the inherent law of inhibition effect of SO2, NOx, PCDD/Fs emissions reduction and the coupling mechanism between them, the sintering exhaust gas pollutants emissions reduction becomes process control instead of end management, which solved the three pollutants (SO2, NOx, PCDD/Fs) emission problems synchronously with high efficiency and low coats, and provided theoretical foundation and technical support to the sustaina

英文关键词： Iron ores sintering；pollutants emission reduction；urea；desulfurization; and denitration；PCDD/Fs