Coordination control method for double-in double-out direct-firing pulverizing system

The invention discloses a coordination control method for a double-in double-out direct-firing pulverizing system and relates to a main control automatic boiler system and a primary air automatic system. Capacity throttle opening of the double-in double-out direct-fired pulverizing system is adjusted by the main control boiler system according to change of a set electrical load and main steam pressure offset, the primary air automatic system not only controls primary air female tube pressure, but also primary air guide vane opening is adjusted according to energy demands of a present combustion condition, under the action of coordinate adjustment of the two sets of automatic systems, balance between a thermal power set fuel amount and load demand is realized. Through the coordination control method, problems of wind-coal ratio determination difficulty, automatic setting difficulty, susceptible to interference and poor stability existing in a traditional coordination control scheme in the prior art are completely solved, and the method is generally suitable for coordination control on same type thermal power sets.