海勃湾电厂330MW燃煤机组SCR脱硝技术改造

发布时间：2018-08-18 10:50

【摘要】：矿物燃料的燃烧为社会进步提供了巨大推动力,但同时也造成了大量污染物的排放,其中包括氮氧化物(NO_x)。作为燃煤大户,目前我国电力生产耗煤量约占全国耗煤总量的50%,这使得氮氧化物的排放量随发电量的增加而成比例增长。因此,NO_x的排放对大气环境带来了日益严重的威胁。随着人们生活条件的改善,环保意识也随之逐渐提高,对污染问题的关注自然也越来越多。为了改善大气环境质量,必须对NO_x的排放进行控制,因此对电厂脱硝系统的研究有重要的工程意义和现实意义。海勃湾电厂的5、6号机组分别配备有一台330MW锅炉,根据国家相关环保政策要求(GB13223-2011),必须将该两台锅炉的氮氧化物排放浓度均降低到100mg/Nm~3以内。因此,该厂两台机组采用了SCR烟气脱硝措施,并分别于2013年12月和2014年4月底前完成了两台机组的改造工程。作为一个国有发电企业,无论是为响应上级要求、履行企业对社会应尽的责任,还是从企业可持续发展的角度考虑,必须对上述两台机组进行相应的烟气脱硝改造工程。然而,如今脱硝工艺种类繁多,这为选择适合锅炉运行特点和符合系统改造要求的技术方案提出了要求。本课题以海勃湾电厂5号机组锅炉实现降低NO_x排放为研究目标,结合锅炉运行现状、燃料指标、设备升级等情况,对烟气脱硝改造方案进行概述,分析改造成果,从而可为今后同类工程改造提供参考借鉴。
[Abstract]:The combustion of fossil fuels provides a great impetus for social progress, but also results in the emission of large amounts of pollutants, including nitrogen oxides (NO_x). As a large coal producer, the coal consumption of electric power production in China accounts for about 50% of the total coal consumption in China, which makes the emission of nitrogen oxides increase proportionally with the increase of electricity generation. As a result, the emission of no _ x has brought an increasingly serious threat to the atmospheric environment. With the improvement of people's living conditions, the awareness of environmental protection is gradually raised. In order to improve the quality of atmospheric environment, it is necessary to control the emission of NO_x, so it is of great engineering and practical significance to study the denitrification system in power plant. There is one 330MW boiler for unit 5 and unit 6 in Haibo Bay Power Plant. According to the requirement of national environmental protection policy (GB13223-2011), the nitrogen oxide emission concentration of the two boilers must be reduced to less than 100mg/Nm~3. Therefore, SCR flue gas denitrification was adopted in two units of the plant, and the revamping works of the two units were completed by December 2013 and April 2014, respectively. As a state-owned power generation enterprise, it is necessary to carry out the corresponding flue gas denitrification project for the above two units in order to respond to the request of the superior, to fulfill the responsibility of the enterprise to the society, or to consider the sustainable development of the enterprise. However, there are many kinds of denitrification technology nowadays, which makes it necessary to choose a technical scheme suitable for boiler operation and meet the requirements of system transformation. Based on the research goal of reducing NO_x emission of Unit 5 boiler of Haibo Bay Power Plant, combined with the status quo of boiler operation, fuel index, equipment upgrade and so on, the project of flue gas denitrification is summarized, and the results of retrofit are analyzed. So it can be used for reference for similar projects in the future.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM621

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