A technical analysis concerning the ways of accurately measuring the primary air velocity in boilers is presented; a selfdeveloped software monitoring system for primary air velocity is introduced here.

The main goal of this paper is to provide a measuring method for primary air velocity using elbow method.

This paper introduces our on line monioring system for primary air velocity,its functions,the system form.

To optimize the gas-solid flows in SLC-S precalciner,the numerical simulation was carried out with tertiary-air velocity changed.

As a result,the opening of inlet damper is so small that the primary air pressure is too high and some pressure energy depletes during throttling with too much power consumption in pulverizing system.

The process of NO x formation is influenced by some factors,such as characteristics of fuel,surplus air ratio,primary air ratio,secondary air ratio,combustion temperature and so on,which is mainly discussed in this paper from the aspects of technology.

In order to obtain optimum operation of boilers and then ensure timely ignition and completely burnout of pulverized coal, pulverized coal combustion processes in a 350MW boiler were numerically calculated under different primary air ratios and pulverized coal fineness.

There are no existing design criteria for primary fan and blower volume and pressure head design margins.

At present,transduced primary fan was used widely in fossil-fuel power plant for energy saving.

The failure of a single primary fan may cause the stoppage of the whole power generating set, but the addition of a ventilation door each in the cold and hot pipelines makes it possible for the single primary fan to run with the coal grinder while the whole power generating set is operating non-stop with considerable economic results.