燃煤机组烟气消白技术路线选择与经济分析

燃煤电厂白色烟羽治理有多种方案，以某300 MW机组为例，进行了系统的湿烟羽治理热力计算，分析了主要影响因素，并作了经济性分析。热力系统计算结果显示：在条件允许的情况下先降低脱硫前原烟气温度是一种有效降低净烟气温度和湿度的方法；降低烟气冷凝换热器的循环冷却水温是减少换热面积的最有效举措；增大循环冷却水量也是一种有效减小烟气冷凝器换热面积的方式。通过经济性分析发现，设备折旧和耗电费用在增加的生产成本中占比较大，机组利用小时数和水价是影响改造工程运行和维护费用的重要因素。对于常规机组而言，消白改造产生的单位发电成本增加值在2.5~4.5元/MW。

Technical Route Selection and Economic Analysis on Wet Plume Treatment for Coal-fired Units

Regarding the multiple available solution strategies for wet plume treatment, systematic thermodynamic calculation has been carried out for a 300 MW unit in this paper. The dominant factors are then studied together with the economic analysis. Calculation results for the thermal system show that if conditions permit, lowering down the flue gas temperature before desulphurization can reduce net gas temperature and humidity effectively. In addition, reducing the circulating cooling water temperature at the flue gas condensing heat exchanger turns out to be the most effective way to reduce heat exchange area. Alternatively increasing the cooling water volume is another efficient way. Through economic analysis, it is discovered that equipment depreciation and electricity consumption account for a larger proportion of production cost increments, while the unit utilization hours and water pricing are important contributors to operation and maintenance cost of the reconstruction project. As far as conventional units are concerned, the extra cost per unit MW generation is around 2.5~4.5 yuan/MW incurred by renovation project of wet plume elimination.