降低环境风对火电厂空冷换热效率影响的措施

该文使用数值模拟方法研究了在夏季高温环境中降低环境风对空冷火电厂换热效率影响的几种方法。数值模拟给出了这些方法改善空冷换热效率的数值结果,特别指出增加位置合适的固壁挡风墙可以改变空冷火电厂周围高速气流的流向,降低环境风对空气冷凝器不利影响;而将这些固壁挡风墙换为阻力因子合适的多孔挡风墙,可以减少冷凝器底部风机的热回流,从而进一步提高空气冷凝器的换热效率。所得的定量结论可以在电厂改造和设计空冷系统时作为参考。

The methods for depressing environmental-wind influence on the heat exchange of the air cooled power plants

Mining cities are an important component of urbanization. Much attention is paid to their resources, environment and sustainable development. Base on the analysis of mining city conception and definition, the meaning and defini-tion standard of mining cities have been studied. Combining with the circular economy of mining cities, the ＂5R＂ principles and basic thoughts of circular economy about mining cities have been established. The circular economy models and approaches （including enterprise, industry area, city and region） have been discussed. Referential proposals for developing circular economy in mining cities have been provided.