关键词: 燃煤发电, 二次再热机组, 控制策略, 汽温控制, 协调控制, 旁路控制

Abstract: Compared with single-reheat units, the thermal efficiency of ultra-supercritical (USC) units with double-reheat technology can be further improved, which results in primary energy saving, emission reduction and environmental protection. In recent years, with the development of design, manufacturing and operation technologies in USC, many countries including China have been encouraged to develop and construct double-reheat units due to the increasing demand for energy conservation and environmental protection as well as its advantages in cost effectiveness. In this paper, in combination with the double-reheat projects being built in China, the main difference of control strategy between double-reheat unit and single-reheat unit is introduced, and the functional design of reheat steam temperature control, coordination control, and bypass control in double-reheat units are explored.

Key words: coal-fired power plant, double-reheat unit, control strategy, steam temperature control, coordination control, bypass control