Volume 54

Optimization of the pulverized system of the coal-fired power plant by revising control strategy Liqun Xie, Chaoyang Wang, Zefeng Liu, Ming Liu, Junjie Yan

Abstract

During load cycling processes of coal-fired power plants, the MPS pulverizers system’s response time dominates the power unit’s operation flexibility. Reducing the effect of the delay and inertia of the pulverizing system is urgent. This study established and validated a complete pulverizing system model, which included six coal mills, coupling with an established coal-fired power plant model. A revised fuel demands control strategy based on the main-auxiliary coordination was proposed. The results show that by implementing the revised control strategy, the absolute pulverized coal output deviation was reduced by up to 216 kg, 126kg, and 116kg, respectively, with three operating modes. When four coal mills were operational, the reduction constituted 0.09% of the pulverizing system’s output during the load transition. The new control strategy enhanced the matching of the main and auxiliary systems in coal-fired power units.

Keywords energy efficiency, power plant, pulverizing system, control scheme optimization