摘要
为实现燃煤机组烟气超低排放,对某电厂1 000 MW燃煤机组实施烟气超低排放的技术改造:脱硝采用低氮燃烧器调整技术和SCR反应器内加装催化剂技术,除尘采用低低温电除尘器和湿式电除尘器,脱硫采用交互式喷淋技术。改造后机组烟气排放按下述流程:低氮燃烧器的锅炉出口烟气依次流经省煤器、SCR、空预器、管式换热器降温段、低低温电除尘器后进入吸收塔,然后经过湿式静电除尘器和管式换热器升温段进入烟囱。改造后烟囱入口的主要烟气污染物NO_x、烟尘、SO_2排放浓度分别达到25.83、1.61和22.08mg/Nm^3,污染物排放浓度数值上低于天然气燃气轮机组排放标准。
To realize the ultra low emissions of flue gases from a 1 000 MW coal-fired boiler unit in a power plant,the following flue gas ultra low emission technical version was applied: low nitrogen burners were used in the denitration process,catalysts were added into the SCR( selective catalytic reduction) reactors,low-low temperature ESPs( electronic static precipitator) and wet type electronic precipitators were employed to remove the dust and the interactive sprinkling technology was used to remove the sulfur. After this technical version has been put in practice,the flow path for discharging the flue gases from the boiler unit can be given as follows: the flue gases outgoing from the outlet of the boiler adopting low nitrogen burners will in turn flow through the economizers,SCR reactors,air preheaters,the desuperheating section of tube type heat exchangers and the low-low temperature ESPs and then enter into the absorption towers,afterwards,pass through the wet type ESPs and the temperature rise sections of the tube type heat exchangers and go into the smoke stacks. After the technical version had been executed,the emissions concentrations of the main pollutants tested at the inlets of the smoke stacks,including NOx,soot and SO_2,arrived at 25. 83 mg / Nm3,1. 61 mg /Nm^3 and 22. 08 mg / Nm^3 at an oxygen concentration of 6% respectively,thus making the pollutant emissions concentrations of the coal-fired boiler unit meet the requirements stipulated in the emission standard for natural gas turbines.
出处
《热能动力工程》
CAS
CSCD
北大核心
2016年第1期111-116,139,共6页
Journal of Engineering for Thermal Energy and Power
基金
国家杰出青年科学基金(51125025)
浙江省重点科技创新团队(2011R50017)
浙江省重大科技专项重点社会发展项目(2014C03018
2013C03022)
关键词
超低排放
污染物
天然气燃气轮机组
标准
ultra low emissions
pollutant
natural gas turbine unit
standard
