关键词: 热工自动控制, 火电厂节能, 滑压优化, 凝结水节流, 汽包水位, 优化控制导则

Abstract: Aiming at the factors affecting the operation of AGC (Automatic Generation Control) system after the low NOx combustion retrofit implemented in the boiler, the reason analysis is conducted, and the specific measures are taken to improve the unit load control strategies. The measures include the boiler master control feedforward signal, the steam turbine load demand, the primary frequency control logic, the load adjustment by PAP (primary air pressure), and the control loops of the mill hot air and bypass air dampers. In addition, the combustion control model is improved based on the changes of the boiler’s features. The technical and economic analysis on these measures and the comparison between the control parameters have shown that the AGC indices are enhanced substantially.

Key words: fossil fuel power generation unit, low NOx combustion, AGC, technology, primary frequency control (PFC)