供热机组-海水淡化联产系统的经济性分析

Economic Analysis of a Heat-Power Cogeneration Set Integrated with a Desalination Plant

针对供热机组-海水淡化联产系统的特点,应用循环函数法、等效焓降法和汽轮机变工况分析理论,建立了计算分析矩阵模型,得出了用于海水淡化的抽汽对供热机组发电和供热两方面以及制水成本影响的计算分析方法。研究结果表明,增加夏季供热负荷用于海水淡化,能够增加供热机组的发电热效率和热能利用率,同时降低海水淡化的成本;采用制水电耗率(ELWP)比采用传统的造水比(GOR)指标更能够准确地评价海水淡化系统热性能;该水电联产系统能够提高热电机组的能源利用效率,有效解决沿海地区火电厂的缺水问题。

A way of analyzing, by calculation, the effect on the cost of power generation, heat delivery and desalination of sea water by using a cogeneration power set not only from power generation and heat delivery but also for desalination with extracted steam on their respective costs, has been developed by making use of the cyclical function method, together with the equivalent enthalpy drop theory and the analysis theory of steam turbines under off-design operating conditions. Results indicate that, by increasing heat extraction for desalination of sea water during summer seasons, the thermal efficiency of the cogeneration set and its heat utilization rate can be raised, simulataneously reducing cost for desalination. The thermal performance of a desalination process can be evaluated much more accurately by the electricity loss for water production （ELWP） than by the conventional GOR method, Such a water-power coproduction system can readily raise the energy utilization rate of cogeneration power units and effectively solve the water shortage problem of fossil fired power plants in coastal areas. Figs 3, table 1 and refs 7,