关键词: 600 MW超临界机组, 最低稳燃负荷, 调峰运行

Abstract: At present, with the increase of grid loads and peak-to-peak difference 600-MW units are becoming the most popular units in the country and operate on regulation more frequently. The typical regulation mode of thermal power units is to reduce the boiler oil-free minimum load under stable combustion, which is referred to as“deep peak regulation”. In this paper the concept of “broad peak regulation” is proposed and related tests are carried out on domestic 600-MW supercritical units. The regulation performance of the units is improved through equipment innovation, combustion adjustment, mixed coal combustion, steam turbine slide pressure operation curve optimization and coordinated control improvement. The target of“broad peak regulation”, to expand the regulation range of the units, can be realized by decreasing the minimum boiler load under stable combustion and increasing the potential loading capability of the units. It may improve the security dispatch and operation stability of power grids. The power generation quantity and economical benefit of the regulation units are increased. The win-win target is achieved between grids and plants.

Key words: 600-MW supercritical unit, oil-free minimum load under stable combustion, deep peak-regulating