太阳能辅助加热燃煤机组给水系统单耗分析

为提高燃煤火电机组热经济性，对抛物面槽式太阳能集热器与常规燃煤机组回热系统耦合机理进行了系统的集成与优化，运用单耗理论分析300 MW燃煤发电机组热力系统各设备的附加单耗在系统集成前后的变化情况，得出了不同太阳能辐射强度下热力系统各设备附加单耗的变化趋势。结果表明，各级高压加热器及除氧器附加单耗随太阳能辐射强度的增强而降低，凝汽器及中低压缸正好相反，高压缸基本不变，汽轮机组附加单耗总值随辐射强度的增强而增加。集成系统在设计太阳能辐射强度900 W/m2时，汽轮机组附加单耗总值增加0.26 g/(kW·h)，机组节煤11.27 g/(kW·h)。

Fuel Specific Consumption Analysis on Water Supply System of Coal-fired Units with Solar Energy Auxiliary Heating System

In order to improve the thermal economy of coal-fired units, the integration and optimization were implemented for the coupling mechanism of the parabolic trough solar collector and the regenerative system in conventional coal-fired units. Then the change of additional fuel specific consumption of equipments in 300 MW coal-fired units is analyzed in this paper before and after system integration, based on fuel specific consumption theory, to obtain the change trend under different solar radiation intensity. The results show that the additional fuel specific consumption of high pressure heaters and deaerators decrease with the increase in the solar radiation intensity, while those of condenser and middle/low pressure cylinders are exactly the opposite, and those of high pressure cylinders are essentially unchanged. The additional fuel specific consumption of steam turbine also increases with an increase in the solar radiation intensity, in which the additional fuel specific consumption of steam turbine increases 0.26 g/（kW·h）, and the saved coal reaches 11.26 g/（kW·h）, when the solar radiation intensity is 900 W/m2 in the integrated system design.