To summarize the formation mechanisms and controlling measures during combustion and analyses the characteristics of the high temperature air combustion, the pu1verized coal low ash combustor and new oxygen-firing and the main reasons of low NOX emission.

As a result, the high efficient and low NOx emission operation mode of the boiler was obtained.

Using this technique can bring about significant fuel savings, low NOx emission, high heat-utilization efficiency and size reduction of the facility.

Taking the primary air enrichment and preheating(PRP) burner as an example,it is shown that high temperature air combustion with high combustion stability and low NO_x emission can be realized on the pulverized coal boiler by use of the high temperature reflow flue gas to rapidly preheat the primary air of low air-coal ratio.

An introduction to the principles of the recombustion technique diminished NO x emission and the way of how to control it, is being presented, accompanied by a description of its application in Baogang Steelwork's home power plant.

The properties of burnout, slagging and NO x emission of brown blending coals have researched and many factors have been discussed.

An exhaust gas recirculation method was practiced with HTAC (High Temperature Air Combustion) technology in forge furnace,and the results confirm extremely low NO X emission.

The NO_x emission characteristics during the pulverized coal combustion process were tested in the one-dimension drop tube under O_2/CO_2 and O_2/N_2 atmospheres.

Practice shows that the maximum comprehensive benefit maintained among boiler efficiency,low energy consumption,and NO_x emission can create much more economic benefits for the enterprise.

The results of practical application show that the layout pattern of lean coal type burners is beneficial to control the formation of NO_x in the initial stage of combustion;adopting low NO_x burning technology + layout pattern of lean coal type burners can further reduce NO_x emission from large-capacity boilers.