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以某电厂亚临界600MW火电机组及其海水淡化系统为例,基于热力学基本原理研究了机组热力系统以及海水淡化系统的能耗特性,构建了基于质量单元的电-水热耗分摊模型和海水淡化热力成本计算模型,并以机组运行负荷、海水淡化系统的造水比、煤价等作为敏感元素,进行了敏感性分析.结果表明:在联产抽汽量一定时,淡化水的成本随着机组负荷的降低而增加;在负荷一定时,淡化水的成本随着抽汽量的增加而降低,但变化幅度不大;海水淡化造水的总成本随着标准煤单价的提高而增加,且标准煤单价对造水成本的影响较大;造水比对淡化水的热力成本影响较大,不同负荷下淡化水热力成本随着造水比的增大而急剧降低.
Taking a sub-critical 600MW thermal power unit of a power plant and its seawater desalination system as an example, the energy consumption characteristics of thermal power system and seawater desalination system are studied based on the basic principles of thermodynamics. An electricity-water heat-loss sharing model based on mass unit and seawater desalination Heat cost calculation model and sensitivity analysis of unit operating load, water ratio of seawater desalination system and coal price as the sensitive elements.The results show that the cost of desalinated water decreases with the increase of cogeneration output When the load is constant, the cost of desalinated water decreases with the increase of steam extraction amount, but the variation range is not large. The total cost of seawater desalination and water production increases with the unit price of standard coal increasing The unit price of standard coal has a great influence on the cost of producing water; the ratio of making water has a greater impact on the thermal cost of desalinated water, and the cost of desalinated water and heat at different loads drastically decreases with the increase of the ratio of produced water.