夏季工况直接空冷系统最佳真空特性的研究
发布时间：2019-03-09 18:39
【摘要】：以某660MW超临界直接空冷机组为研究对象,基于机组夏季工况下实际运行数据,建立了汽轮机变工况模型与空冷系统变工况模型,并分别利用电厂空冷系统常干时性能曲线以及电厂原热力特性计算说明书验证了这2个模型的计算准确性.分析了不同边界条件下(包括空气温度、凝汽器的换热环境、负荷、风机转速等)凝汽器最佳真空的选取.结果表明:夏季工况下,当负荷较高时,风机应始终保持在超频运行,以维持空冷系统的背压,保证运行安全性;当负荷较低时,在固定凝汽器蒸汽质量流量下,随着冷却空气量的增加,机组出力增加量与风机耗功增加量的差值有最大值.运行时应首先考虑如何合理设置运行参数以得到较高经济性.
[Abstract]:Taking a 660MW supercritical direct air-cooling unit as the research object, based on the actual operation data of the unit in summer, the variable working condition model of steam turbine and the off-condition model of air-cooling system are established. The accuracy of the two models is verified by using the constant dry-time performance curve of the air-cooling system of the power plant and the calculation instructions of the original thermal characteristics of the power plant respectively. The optimum vacuum selection of condenser under different boundary conditions (including air temperature, heat exchange environment of condenser, load, fan speed, etc.) is analyzed. The results show that when the load is high in summer, the fan should always be kept in overfrequency operation to maintain the back pressure of the air-cooling system and ensure the safety of operation. When the load is low, there is a maximum difference between the increase of unit output and the increase of fan power consumption with the increase of cooling air volume under the condition of fixed steam mass flow rate of condenser. First of all, how to set the operating parameters reasonably should be considered in order to obtain higher economy.
【作者单位】： 华北电力大学国家火力发电工程技术研究中心;
【基金】：国家重点基础研究发展计划资助项目(973计划)(2015CB251505) 国家科技支撑计划资助项目(2014BAA06B02) 国家自然科学基金资助项目(U1261210,51306050) 中央高校基本科研业务费专项资金资助项目(2015MS43,2015XS81,2014XS19,2014XS13)
【分类号】：TM621
[Abstract]:Taking a 660MW supercritical direct air-cooling unit as the research object, based on the actual operation data of the unit in summer, the variable working condition model of steam turbine and the off-condition model of air-cooling system are established. The accuracy of the two models is verified by using the constant dry-time performance curve of the air-cooling system of the power plant and the calculation instructions of the original thermal characteristics of the power plant respectively. The optimum vacuum selection of condenser under different boundary conditions (including air temperature, heat exchange environment of condenser, load, fan speed, etc.) is analyzed. The results show that when the load is high in summer, the fan should always be kept in overfrequency operation to maintain the back pressure of the air-cooling system and ensure the safety of operation. When the load is low, there is a maximum difference between the increase of unit output and the increase of fan power consumption with the increase of cooling air volume under the condition of fixed steam mass flow rate of condenser. First of all, how to set the operating parameters reasonably should be considered in order to obtain higher economy.
【作者单位】： 华北电力大学国家火力发电工程技术研究中心;
【基金】：国家重点基础研究发展计划资助项目(973计划)(2015CB251505) 国家科技支撑计划资助项目(2014BAA06B02) 国家自然科学基金资助项目(U1261210,51306050) 中央高校基本科研业务费专项资金资助项目(2015MS43,2015XS81,2014XS19,2014XS13)
【分类号】：TM621
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