Analysis on "against the wind" of primary air fan in 300MW CFB boiler

Abstract

When the primary air fan of a 300MW circulating fluidized bed boiler is operated at a variable frequency, there is a problem of "against the wind" under the condition that the fan is under low load and the air pressure is low. This paper aims at fixing the aforementioned problem and finding out the cause of the "against the wind" of the primary air fan, and proposing the solutions of adjusting the frequency conversion and the inlet diversion at the same time by analyzing the cold fluidization test, the combination test of the fan adjustment mode, the frequency and speed test of the frequency converter, etc. This method successfully avoids the "Agiainst the wind" situation during low load operation, which is important for the adjustment of low-load down-conversion operation of primary air fan of circulating fluidized bed boiler.