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中国电机工程学报 2007, 27(29) 1-6 DOI:
ISSN: 0258-8013 CN: 11-2107/TM |
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单压过热蒸汽余热锅炉抽汽运行的解析特性 |
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杨承 杨泽亮 蔡睿贤 |
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华南理工大学电力学院 华南理工大学电力学院 中国科学院工程热物理研究所 |
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摘要：
抽取余热锅炉的部分饱和蒸汽供吸收式制冷或供热是常见的余热利用方式之一。在单压过热蒸汽余热锅炉变工况解析解的基础上，推导出其抽汽运行特性的近似解析解，给出余热锅炉设计压力抽汽运行的解析特性。定性分析和解析结果表明，抽汽后接近点温差和余热回收率的变化甚微，节点温差略有增大，但热端端差迅速下降。近似解析解与数值解对比表明，蒸汽产量的解析解在工况变动较大的范围内是可靠的，过热蒸汽温度的解析解适用于设计工况附近和饱和蒸汽抽汽量不大的情况，基于数值结果给出的过热蒸汽温度拟合式则在工况变动较大的范围内也适用。该解析特性对分析余热锅炉冷、热、电并供的变工况有理论意义，也便于进行初步工程分析、核算。 |
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关键词：
余热锅炉
变工况
解析解
抽汽
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THE ANALYTICAL OFF-DESIGN PERFORMANCE OF HRSG WITH STEAM EXTRACTION |
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Abstract:
Saturated steam extraction from the evaporator of HRSG (heat recovery steam generator) is often applied in various industries. Based on the analytical solution for the off-design performances of superheated steam HRSG with single pressure, an approximate analytical solution for the performances of HRSG with steam extraction is deduced and the all-around off-design performances are further discussed through the analytical solution and qualitative analysis。The quantitative and qualitative analysis accordantly show that, steam extraction has little influence on the approach point temperature difference and heat recovery rate; however, the pinch point temperature difference slightly rises with the steam extraction, while the heat end thermal temperature difference greatly drops. Comparison between the approximate analytical solution and more accurate computational solution indicates the steam production analytical solution is reliable in various off-design conditions while the steam temperature obtained by analytical solution is only available for the case of near-design conditions. However, the presented regression solution for steam temperature is applicable in wide off-design conditions. The analytical off-design performances of HRSG with steam extraction are meaningful for the theoretical research and are suitable for primary engineering analysis also. |
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Keywords:
HRSG
off-design performance
analytical solution
steam extraction
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收稿日期 2007-01-12 修回日期 1900-01-01 网络版发布日期 |
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DOI: |
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基金项目:
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通讯作者: 杨承 |
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作者简介: |
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作者Email: chyang1@scut.edu.cn;020ych@21cn.com |
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| 本刊中的类似文章 |
| 1．刘向杰 殷冲 侯国莲 张建华.联合循环电厂余热锅炉的监督预测控制策略[J]. 中国电机工程学报, 2007,27(20): 52-58 |
| 2．王强 曹小玲 苏明.余热锅炉汽包水位波动信号的EMD特性分析[J]. 中国电机工程学报, 2007,27(2): 15-19 |
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| Copyright by 中国电机工程学报 |
