摘要
对于凝汽式机组,提出采用低真空运行后的高温排汽作为低温多效蒸馏海水淡化的热源,实现水电联产。在此基础上,冬季利用一部分汽轮机排汽用于对热用户供暖。电厂在低真空运行模式下的热力计算采用矩阵法并基于弗留格尔公式进行变工况计算。低温多效蒸馏海水淡化系统的数学模型采用等温差法建立,并同时建立了制水成本的经济性计算模型。根据计算结果分析了低温多效蒸馏海水淡化系统的蒸发器效数、供热负荷、蒸发器传热系数和制水成本之间的关系,并得出了影响制水成本的主要因素及其敏感性分析。
The condensing power plants under low vacuum operation, which provide exhaust steam for the low-temperature multi-effect distillation desalination system were presented to achieve water and power cogeneration. Based on the cogeneration some part of the exhaust from steam turbine was used to supply heat for the hot users. The matrix was used to solve the thermal system for power plant. Low-vacuum operation model was based on the calculation of off-design, using Friuli Nagel formulation. For the desalination process, equivalent temperature difference method was adopted. The thermo-economic model of the water cost was also established. The results show that there is a best evaporater effect number for the water cost as the effect number increases, and the best effect number will change under different heating load.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2011年第8期1174-1179,共6页
Acta Energiae Solaris Sinica
基金
大连市城乡建设委员会科技计划项目(200703)
关键词
海水淡化
低温多效蒸馏
凝汽式机组
低真空
水热电三联产
desalination
multi-effect distillation
condensing steam turbine
low vacuum
water, heat and power cogeneration
