| The pollutant come from the coal combustion already become the main source of atmosphere pollution. One of the primary factors of atmosphere pollution is NO_x from coal-fired power plants. Environmental pollution already became one of our country economy development main restriction factors, so governed NO_x emission of coal-fired power plant is become urgent mission. Considered our country take the coal-electricity as the national condition, in the present economical development situation, develop the effective low-NO_x combustion technology, will have very important social efficiency and economic efficiency in the future.The low-NO_x combustion technology is the first choice of the NO_x control technology in thermal power unit. The air staged combustion technology is one kind of rich-lean combustion technology based on the comprehensive burning adjustment, which has become the important method to reduce density of NO_x in the combustion product and reduce the environmental pollution, so it is generally used in the boiler transformation and the new boiler unit's construction. Various research indicated that the staged combustion have obvious effect to reduce the NO_x production of high volatile matter coal. But also lack the system research to low NO_x of the boiler transformation now.The article begin with the air grading as well as the low-NO_x combustion application, focusing on the research, design and application of the high efficiency and low-NO_x emission system integration technology, with the methods of experience, theory narration, combining with mathematics model research. Based on the theory analysis, the simulated experiments to the bias burner are conducted on the cold modeling bench, while the design parameters are optimized. The air staged combustion test is carried on the hot bench, which aims at different coals and different operating parameters to determine appropriate transformation programs. Research staged combustion pollution to generate mathematical models for value simulation. Unify the cold modeling experiment and the burning test research to conduct the optimization research of the transformation programs. Carry on the utility boiler's parameter optimization research for the combustion system design of high efficiency and low NO_x; development of key equipment; conduct the movement parameter optimization research; study the low-NO_x combustion energy conservation technology; high efficiency and low-NO_x combustion system's key equipment manufacturers; established the ensemble method of three staged controlled rich-lean low NO_x combustion comprehensive technology, conduct the industrial application research on the 200MW power plant boiler; conduct the demonstration boiler unit performance inspection experimental study.The result indicated that the parameters of air staged combustion have a significant influence on reducing the NO_x production. It can reduce NO_x through the air staged combustion. Compared with before transformation the NO_x emission reduce 494mg/Nm3 to 508mg/Nm3 after rebuilding while the reduction rate reaches to 56.7%~58.3%. After transformation the thermal efficiency of boiler is 90.439%, which improves 1.047% compared with before transformation. Through the continual adjust operation and observe it can be discovered that the boiler is not appeared the situation such as slag-bonding, excess temperature and so on.The main innovation achievement of this article is: The system of air staged low NO_x emission which have our own independent intellectual property right is formed by various technology integrated and optimizes; it have reached high-effect energy conservation with the link of contamination control and energy-efficient technology; and it have realized optimizing economy operation with the union of intelligent control technology and low NO_x emission technology.The work of this paper may instruct the research and project application of low NO_x power plant boiler.
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