地下进风系统对间接空冷塔性能的影响
Influence of Underground Air Intake System on the Performance of Indirect Dry Cooling Tower
张学镭 1贾程广 1梁建雄 1王普 1赵哲 1贾雅永1
作者信息
- 1. 河北省低碳高效发电技术重点实验室(华北电力大学),河北省 保定市 071003
- 折叠
摘要
削弱环境风对间接空冷塔散热器性能的不利影响,有助于其安全和经济运行.该文提出一种新型间接空冷塔地下进风系统,将空冷散热器整体布置在低于地表平面的地下空间内.建立配置地下进风系统的间接空冷塔数值计算模型,得到间接空冷塔的空气流场特性和热力特性.基于凝汽器和空冷散热器协同调节、相互制约的作用机制,采用机理模型和数值模拟相结合的方法建立排汽压力的计算模型,在此基础上计算地下进风系统的热经济性.结果表明,在4 m/s风速下,虽然迎风扇段空气流量减少 14.5%,热负荷降低12.4%,但侧风扇段和背风扇段冷却空气量分别增加46.0%、8.0%,热负荷分别提升30.9%、3.2%.在高风速工况下,地下进风系统削弱环境风对排汽压力的影响,具有抵御自然大风的能力.某660 MW间接空冷机组,采用地下进风系统全年可节约标煤9 554.3 t,节省燃料费1 094.0万元.
Abstract
Reducing the adverse effect of ambient wind on the performance of air-cooled radiator can ensure its safe and economical operation.A new method to enhance the performance of indirect dry cooling tower(IDCT)is proposed by using underground air intake system,namely arranging the air cooling radiator in the underground space below the surface plane.The manuscript establishes the numerical model of IDCT with underground air intake system,and the air flow characteristics and thermodynamic characteristics of IDCT are investigated.Based on the mechanisms of the synergic regulation and mutual constraint between the condenser and the air-cooled radiator,the calculation model of exhaust steam pressure is established by combining the mechanism model and numerical simulation.In addition,the economy of IDCT with underground air intake system is calculated.The results show that under the wind speed of 4 m/s,although the cooling air flow and heat rejection of the windward radiator section decrease respectively by 14.5%and 12.4%,the cooling air flows of the side radiator section and the back radiator section increase respectively by 46.0%and 8.0%,resulting in the increase in the heat rejection by 30.9%and 3.2%respectively.Under the condition of high wind speed,the underground air intake system greatly reduces the adverse influence of ambient wind on exhaust steam pressure and has the ability to prevent ambient wind.A 660 MW unit with IDCT can save 9 554.3 t of standard coal and 10.94 million Yuan of fuel cost per year by using underground air intake system.
关键词
地下进风系统/间接空冷塔/数值模拟/环境风/排汽压力Key words
underground air intake system/indirect dry cooling tower/numerical simulation/ambient wind/exhaust pressure引用本文复制引用
基金项目
国家重点研发计划(2018YFB0604302)
出版年
2024
国家科技期刊平台
NSTL
万方数据