光煤互补发电系统的锅炉变工况性能研究

通过对光煤互补发电机组的集热子系统、汽轮机子系统和锅炉子系统进行建模,研究在多种典型集成方式下,太阳能热输入对锅炉变工况特性及机组热经济性的影响.结果表明,当太阳能热集成于锅炉再热器之前,太阳能热输入将导致锅炉再热温度下降,影响锅炉安全性与机组热经济性;而若将太阳能热集成于锅炉再热器之后,太阳能热输入不影响主蒸汽和再热...

STUDY ON BOILER OFF-DESIGN PERFORMANCE OF SOLAR-AIDED POWER GENERATION SYSTEM

The sub-systems of solar field, turbine and boiler in a solar-aided power generation system were modeled in this paper. And the performance of the boiler and thermal economic of the system were analyzed in a variety of typical integration solar heat input modes. The results indicate when solar heat is arranged before re-heaters, solar heat input will cause the reheating temperature of the boiler to drop which sacrifices the safety of the boiler and thermal economic of the system. However, when solar heat is arranged after re-heaters, solar heat input will have no influence on the temperatures of the main stream and reheated steam. Using solar heat to replace the 3rd-stage extraction steam is better than to replace the 1st-stage extraction steam in terms of the cycle specific work of the system, the standard coal consumption rate and the thermal-to-electricity efficiency. Finally, the case study shows when the 3rd-stage extraction steam is totally replaced by solar heat, the standard coal consumption rate decreases to 7.95 g/kWh, and the solar heat-to-electricity efficiency remains around 39%.