Dissertation > Industrial Technology > Electrotechnical > Power generation, power plants > Power plant > Thermal power plants, thermal power stations > Boilers and combustion systems

The Study on the NO_x Reduction Effect of Low NO_x Burner Reformation

Author LiMing
Tutor LiaoYanFen
School South China University of Technology
Course Power Engineering
Keywords NO_x de-nitration low NO_x burners tertiary air
CLC TM621.2
Type Master's thesis
Year 2013
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China is one of the countries with huge world’s energy consumption, with the continuingreform and in-depth of the market economy and the improving degree of industrialization ofthe country and the rise of a variety of large industrial enterprises, huge consumption of fossilfuels and the consequent environmental pollution problems had been brought. It’s important totake further control of nitrogen oxide (NO_x) emissions on the national economy andenvironmental protection, sustainable development.Currently, technologies used in power plant for NO_x control are of mainly three types:low-NO_x burners, selective catalytic reduction flue gas de-nitrification technology (SCR) andselective non-catalytic reduction flue gas de-nitrification technology (SNCR). Among them,the reformation of low-NO_x burners and operation and maintenance costs are relatively low,but has slightly lower de-nitrification efficiency. SCR renovation and operation andmaintenance costs is the highest but it has the largest de-nitrification efficiency; SNCRrenovation costs are of the middle, and has higher operating costs, but the de-nitrificationefficiency is in general. To meet stricter environmental during the2010Guangzhou AsianGames standards, Guangzhou power plant unit renovation the50MW unit#3boiler in itsmaintenance of early2010, and became a typical boiler low NO_x burner system.Based on the principles of NO_x generation, several popular low NO_x burners wascompared, and chosen the schedule which is the most suitable of the several outstandingmanufacturers. After the cold test of boiler performance and a period of operation, we foundthe NO_x emission concentrations is higher than the technical requirements, and there wereproblems such as tertiary air vents burned, convection flue entrance slagging, cold ash bucketslagging,which seriously affecting the normal safe operation of the boiler. Thus, the tertiaryair structure was optimized based on early construction through technical analysis. Afteranalyzing the situations of the reformed low-NO_x burners and optimized operation, we foundthe reformation and optimization already achieved the former technical performance, and theNOX emission concentration met to the national emission standards.

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