Abstract: Abstract:In practical operation of a power plant, a certain percentage of nondesigned coal may be blended with the designed coal and burned. Taking multiple coal grades blending in a power plant in Shanxi as research object, the influence of coal blending with different blend ratio on the generating cost was analyzed. The enumeration method was used to search the optimal blend scheme, and a best blend ratio for multiple coal grades blending was obtained by calculation. Based on this, a practical multiple coal grades blending software system was developed, and it is able to reduce the fuel cost and to improve the economic efficiency of the power plant by this software.

Key words: Key words:thermal power plant, multiple coal grades blending combustion, generating cost, best blend ratio