Energy consumption analysis of seawater desalinationcoupled with 660 MW thermal power plant
Based on the energy conservation and mass conservation law,a mathematical model of the cogeneration system is developed,integrating 660 MW generating unit with low-temperature multi-effect evaporation seawater desalination system with thermal vapor compressor.System performances at variable working conditions are simulated.The influences of the amount of steam extraction,power generation load,feeding steam and steam extraction on coal consumption,power generation and specific energy consumption for freshwater are analyzed.The results show that when the power generation load is constant,the net coal consumption of extraction steam increases with the increase of extraction steam,and it presents an upward convex shape.When the amount of steam intake is 40％,the reduced power generation rises with the increase of the amount of steam extraction,and it presents an obvious convex parabola shape,that is,the load reduction capacity of unit mass of steam extraction decreases.Under the same power generation load,because of the steam extraction pressure change,the gained output ratio decreases gradually with the increase of steam extraction capacity.Under the fixed extraction,the increase of power generation load contributes to the increase of gained output ratio of the desalination plant.
water and power cogenerationdesalinationcoal consumption for water productiongained output ratio
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