300 MW循环流化床锅炉机组超低排放改造Ultra-low emission modification of 300 MW circulating fluidized bed boilers unit
伊长涛,辛胜伟,王虎,孙国文
YI Changtao,XIN Shengwei,WANG Hu,SUN Guowen
摘要(Abstract)：
随着国家和地方燃煤电厂超低排放环保政策的相继出台,要求各燃煤电厂全面实施超低排放改造。国家能源集团S电厂2×300 MW亚临界循环流化床(CFB)锅炉机组开展了超低排放改造技术路线的论证和关键技术研究。电厂采用炉内脱硫和炉内低氮燃烧,炉外选择性非催化还原(SNCR)技术和半干法脱硫除尘一体化工艺实现超低排放的技术路线,投资和运行经济性较好,初投资比湿法脱硫工艺更省,可节省投资2 700万,综合年费用较湿法脱硫工艺低150万～300万元/a,更适应未来环保发展趋势。炉外半干法脱硫除尘系统设置预电除尘、优化引风机压力裕量、采用炉内炉外协同脱硫运行方式,还可进一步提高锅炉运行经济性。设置预电除尘器,炉外脱硫钙硫比可降低0.4～0.7。
With the introduction of ultra-low emission environmental protection policies in national and local coal-fired power plants,ultralow emission modification of coal-fired power plants is required to be carried out in an all-round way.Research on the demonstration and key technology of the technical route for ultra-low emission modification of the 2×300 MW subcritical CFB boiler unit was carried out.The power plant adoptd the technical route of desulphurization in furnace and low-nitrogen combustion in furnace,SNCR outside furnace and semi-dry desulphurization and dust removal to realize ultra-low emission,and the investment and operation economy is good.The initial investment is less than that of wet desulfurization process,which can save 27 million yuan.The comprehensive annual cost is 1.5-3.0 million yuan per year lower than that of wet desulfurization process,and it is more suitable for the future development trend of environmental protection.The semi-dry desulphurization and dust removal system outside the furnace can further improve the operation economy of the boiler by setting pre-electric dust removal,optimizing the pressure margin of the induced draft fan,and adopting the coordinated desulphurization operation mode inside and outside the furnace.The ratio of desulfuration calcium to sulfur outside the furnace can be reduced by 0.4-0.7 by setting a pre esp.
关键词(KeyWords)：
循环流化床;超低排放;湿法脱硫;半干法脱硫
circulating fluidized bed;ultra-low emission;wet desulfurization;semi-dry desulphurization
基金项目(Foundation):
作者(Author):
伊长涛,辛胜伟,王虎,孙国文
YI Changtao,XIN Shengwei,WANG Hu,SUN Guowen
DOI: 10.13226/j.issn.1006-6772.19100801
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