基于吸收式热泵解耦的燃煤热电联产机组 辅助新能源消纳深度调峰特性研究

Taking a 350 MW cogeneration unit as the research object, an off-design model considering valve-point effect was established, and the absorption heat pump suitable for heat-power decoupling was designed. The deep peak shaving characteristics of the unit to assist renewable energy accommodation through heat-power decoupling were studied. Results show that the absorption heat pump decoupling can effectively enhance the deep peaking capacity of the cogeneration unit. The maximum newly added deep peaking capacity can reach up to 62 MW, and the coal saving capacity for peak shaving varies from 0 t/h to 28 t/h. The coal saving capacity for peak shaving under the same peak shaving load changes nonlinearly, and the maximum change amplitude can reach 1.1 t/h. After decoupling, the coal saving rate for peak shaving varies from 400 g/(kW·h) to 506 g/(kW·h), and the variation amplitude is 106 g/(kW·h). It is suggested that in the case of absorption heat pump decoupling, the cogeneration unit should be run in the area with high coal saving rate for peak shaving to achieve the maximum coal saving.