以某空冷600 MW光煤互补发电机组为研究对象,对机组在两种典型运行模式下太阳能发电量、光电转换效率、标准节煤量等热性能进行分析比较。针对已建成光煤互补机组,提出太阳能利用效益最大化新热循环效率评价指标,并以新热循环效率最大为目标的光煤互补机组背压优化新方法,获得不同负荷下背压优化后机组热性能的提升效果,最后定量分析环境温度对机组热性能优化的影响。结果表明：机组在“功率增大型”模式下的热性能更优;背压优化后机组在两种运行模式下的热性能提升效果受太阳直接辐照度和机组负荷影响。光电转换效率、热循环效率和节煤量的提升效果随环境温度的降低而增强。
Abstract
This work investigated the thermal performance of a 600 MW direct air-cooled power generation system assisted by a parabolic trough solar field. The system was analyzed under two typical operation modes, focusing on solar power generation, solar-to-electric efficiency and saved standard coal consumption. For the established solar-aided coal-fired unit, a new thermal cycle efficiency evaluation index for maximizing the benefit of solar energy utilization was proposed, and the backpressure was optimized accordingly. The results show an improvement in thermal performance after backpressure optimization under different turbine loads. Besides, the influence of ambient temperature on the thermal performance improvement was quantitatively analyzed. The results show that the thermal performance of the unit under the power boosting mode is better. The thermal performance promotion after backpressure optimization in two operation modes is affected by the direct solar irradiance and the turbine load. The improvement of solar-to-electric efficiency, thermal cycle efficiency and saved standard coal consumption increases as the ambient temperature decreases.
关键词
太阳能 /
燃煤电站 /
能量转换 /
运行模式 /
背压优化
Key words
solar energy /
coal fired power plant /
energy conversion /
operation mode /
backpressure optimization
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