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化工学报  2015 

干-湿冷却系统对空冷机组热经济性影响的分析

DOI: 10.11949/j.issn.0438-1157.20140990, PP. 433-440

Keywords: 空冷,背压,干-湿混合冷却系统,传热,模型,热力学,热经济性

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Abstract:

受环境温度影响,空冷机组夏季工况的运行背压高,严重限制了机组的带负荷能力,并影响机组的热经济性和安全性。分析了一种干-湿混合冷却系统,将汽轮机排汽分流出一部分通过循环水冷却,以降低机组夏季工况背压。建立了干-湿混合冷却系统对机组热经济性影响的数学模型,并以某330MW直接空冷机组为例揭示了机组背压和净功率随主蒸汽流量、湿冷分流量以及环境温度的变化规律。结果表明:主蒸汽流量为1120t·h-1、湿冷分流量为175t·h-1时,机组出力从326.266MW达到330MW满负荷运行,提高了3.734MW,背压由46.8kPa下降到31.9kPa,机组的热耗率降低了110.9kJ·(kW·h)-1,发电标准煤耗率降低了4g·(kW·h)-1。

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