水泥炉窑烟气SNCR脱硝技术的研究与应用

发布时间：2018-05-13 02:32

本文选题：水泥炉窑 + 烟气脱硝　；参考：《西安建筑科技大学》2015年硕士论文

【摘要】：水泥工业氮氧化物(NO_X)的排放量在全国NO_X的排放中占有较大的比例,是造成大气污染的主要原因之一。本文分析了水泥工业NO_X的产生机理,介绍了水泥工业烟气脱硝技术的原理,从技术成熟度、脱硝效率、工程实施的难易程度、投资运行成本及排放标准等方面对两种主要脱硝工艺SNCR法和SCR法进行了比较,给出了目前水泥工业SNCR法进行烟气脱硝的实用性和技术优势。本文通过SNCR法使用不同还原剂性能指标的比较,给出通常选择氨水作为还原剂的原因;同时,通过CFD技术,对分解炉内烟气流场和温度场进行模拟,为还原剂的喷入点的确定提供依据。提出了SNCR法烟气脱硝技术影响脱硝效率的因素,如反应温度、喷点位置、氨氮比(NSR,Normalized Stoichiometric Ratio)、停留时间、氧含量等,通过实际工业对比试验,对其影响程度进行了分析,并确定了上述影响因素在目前排放要求下SNCR脱硝设计和实施中的最佳取值。本文根据以上研究结果,结合两个实际工程案例,对使用不同还原剂时烟气脱硝的各项技术经济指标进行对比说明,对脱硝效率的主要设计参数进行优化,并结合实际运行参数对其影响程度通过图表形式进行了分析,得出不同喷氨量条件下NO_X排放浓度和氨逃逸浓度、不同目标排放浓度对应的NSR值等,还对SNCR脱硝对水泥生产工艺的影响进行初步分析。给出了工程案例中脱硝系统设备选型的原则、喷枪安装注意事项和配置等。同时为保证脱硝系统安全运行,考虑设置环境安全喷淋控制装置以达到控制氨泄漏造成的危害。
[Abstract]:The amount of nitrogen oxide (NOX) in cement industry accounts for a large proportion of NO_X emissions in China, which is one of the main causes of air pollution. This paper analyzes the production mechanism of NO_X in cement industry, introduces the principle of flue gas denitrification technology in cement industry, and introduces the technical maturity, denitrification efficiency and the degree of difficulty in project implementation. Two main denitrification processes, SNCR method and SCR method, are compared in terms of investment operating cost and emission standard. The practicability and technical advantages of SNCR process for flue gas denitrification in cement industry are given. In this paper, the reason why ammonia is usually chosen as reducing agent is given by comparing the performance indexes of different reductants used in SNCR method, and the flow field and temperature field of flue gas in calciner are simulated by CFD technology. It provides the basis for determining the injection point of reducing agent. The factors influencing the denitrification efficiency of flue gas denitrification by SNCR are put forward, such as reaction temperature, injection point location, ammonia to nitrogen ratio, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N and N, etc. The optimum value of the above factors in the design and implementation of SNCR denitrification under the current emission requirements is determined. Based on the above research results and two practical engineering cases, this paper compares the technical and economic indexes of flue gas denitrification with different reducing agents, and optimizes the main design parameters of denitrification efficiency. Based on the analysis of actual operation parameters, the NO_X emission concentration and ammonia escape concentration, and the corresponding NSR value of different target emission concentration are obtained. The effect of SNCR denitrification on cement production process was also analyzed. The principle of equipment selection of denitrification system in engineering cases, the matters needing attention in installation and configuration of spray gun are given. In order to ensure the safe operation of denitrification system, environmental safety sprinkler control device is considered to control the harm caused by ammonia leakage.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X781.5

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