SCR脱硝技术在华能上安电厂600MW机组的应用研究

发布时间：2018-06-11 20:47

本文选题：NOX减排 + SCR脱硝　；参考：《华北电力大学》2015年硕士论文

【摘要】：我国的电力生产以燃煤火电为主,但其排放的污染物造成的环境污染是制约我国电力工业发展的因素之一,NOX是燃煤电站排放的主要污染物之一,其排放量随着经济的发展不断增加。随着火电厂污染物排放新标准的推出,继粉尘和SO2控制后,NOX的减排将是燃煤电站重点治理的目标污染物。为积极响应国家和地方政府的环保政策,减轻对环境的污染,上安电厂对三期工程2×600MW机组进行了脱硝改造。本文介绍了燃煤电站脱硝技术现状,通过对比SCR、SNCR及SCR/SNCR联合脱硝技术的优缺点,选择了SCR脱硝工艺作为本改造工程的主要工艺,反应器安装在省煤器和空气预热器之间,为高含尘布置方式,催化剂选择蜂窝式,催化剂区域内空塔流速为5.3m/s,催化剂孔内流速宜取6.9m/s,防止催化剂磨损和堵塞。论述了锅炉相关设备的改造过程及改造后对锅炉运行的影响。脱硝工程投产后,NOX排放浓度值为97.5mg/Nm3(6%O2),每年减排13434.4t的NOX,NOX排污费少缴纳约848万元(按0.6元/当量计算)。脱硝系统的性能评价主要采用实验的方法对反应器各参数,包括脱硝效率、氨逃逸率、SO2/SO3转化率、系统压降、氨氮摩尔比等参数进行了测试,并对其性能进行了分析。结果表明,除氨逃逸量有轻微超标外,各项指标都能很好地满足性能要求。工程投资估算及经济评价显示工程动态投资17959万元,单位投资150元/千瓦,脱硝工程对经营期平均上网电价的影响为10.02元/MWh。上述的结果表明,脱硝工程的建设及运行对电厂及所在当地具有良好的环境和经济效益。
[Abstract]:Coal-fired thermal power is the main power production in China, but the environmental pollution caused by the pollutants emitted by it is one of the factors restricting the development of China's power industry. NOX is one of the main pollutants emitted from coal-fired power stations. With the development of economy, the amount of emission is increasing. With the introduction of new emission standards for pollutants in coal-fired power plants, the emission reduction of no _ X after dust and so _ 2 control will be the target pollutants of coal-fired power plants. In order to respond positively to the environmental protection policies of the state and local governments and reduce the pollution to the environment, 2 脳 600MW units of the third phase project of Shangan Power Plant were retrofitted with denitrification. This paper introduces the present situation of denitrification technology in coal-fired power stations. By comparing the advantages and disadvantages of SCRN SNCR and SCR / SNCR combined denitrification technology, SCR denitrification process is selected as the main process of this revamping project, and the reactor is installed between economizer and air preheater. For the arrangement of high dust content, the catalyst is honeycomb, the flow velocity of empty tower is 5.3 m / s in the catalyst area, and the velocity of flow in the catalyst pore is 6.9 m / s to prevent the wear and clogging of the catalyst. The retrofit process of boiler related equipment and its influence on boiler operation are discussed. After the denitrification project was put into operation, the emission concentration of NOX was 97.5mg / Nm3O2N, and the annual emission reduction of 13434.4t of NOXO _ X was reduced by about 8.48 million yuan (calculated by 0.6 yuan / equivalent). The performance evaluation of denitrification system was mainly carried out by experimental method, including denitrification efficiency, ammonia escape rate and so _ 2 / so _ 3 conversion rate, pressure drop of the system, and the ratio of ammonia to nitrogen, and the performance of the system was analyzed. The results show that all the indexes can well meet the performance requirements except that the amount of ammonia escape is slightly over the standard. The project investment estimation and economic evaluation show that the dynamic investment of the project is 179.59 million yuan and the unit investment is 150 yuan / kW. The effect of denitrification on the average net electricity price in the operation period is 10.02 yuan / MWh. The above results show that the construction and operation of the denitrification project have good environmental and economic benefits for the power plant and its local area.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X773

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