The principles and application of concentration-decentration split combustion on 670t/h boiler are illustrated.

Through the whole pre-mixed,adapting the ratio of N2,rich-lean combustion and so on,the result is that increasing the ratio of N2 and rich-lean combustion can successfully reduce the thermal NOx emission compared to the whole pre-mixed combustion,because of the major effect factors temperature and density of [O2],and there is a optional ￠r between 1 and 2 in rich-lean combustion.

The techniques used in low-NOx combustion system in Guohua Thermal Power Plant, Beijing, such as air staging, fuel staged, rich-lean combustion, are introduced.

Simulation for rich and lean combustion of gas water heater is conducted.

The application, abrasion especially material of concentrator vane for direct-flow bias burner of 670t/h boiler are analyzed, the forms of failure are determined to improve abrasion property of concentrator.

Types and status quo of bias burners in China are analyzed and the characteristics and application range of several foreign clean,steady and high concentration pulverized coal combustion techniques are discussed in the article,which can provide useful instruction and reference for the development and exploitation of Chinese bias burners.