The circulating ratio effecting on CFB;

In view of low efficiency and high circulating ratio problems of classifier for boilers of 4×300MW units in Xiangfang Power Generation Co Ltd, Hubei Province, a retrofitting scheme of changing original single shaft classifier to series double shaft one has been put forward.

Through analysis on designing and operating of circulating fluid bed boiler, such as the fluid bed temperature, location of feed coal point, the analyzer style, circulating ration and re-feed appliance etc.

The paper studies how to determine the medium circulation ratio on principal of heat balance and some influence factors on circulation ratio are discussed in the paper.

Analyzed is the influence of the heat transfer area and the circulation ratio of various stages on the mean condensation temperature.

In this Paper heat balance equation is set up for dense phase region of CFB boiler according to which circulation ratio may be test test some reasonable simplification

Dust concentration in flue gas decided by circulating rate is a vital factor, which effects heat transfer, combustion and combustion efficiency, steam temperature of boiler superheaters, turn down capability and design of separators.

The effect of fly ash recycling way, recycle ratio and operation parameters on combustion character are studied and introduced.

The results of the study show that, to the expected chemicals yields, power and steam/heat self-balance can be achieved by means of adjusting methanol synthesis recirculating ratio in a serial co-production system with GPMS.

Analyzed the factor that influenced the circulation coefficient in designing boiler and the mechanocaloric parameter in operating boiler.