某330 MW燃煤机组冷凝-再热烟羽治理系统运行测评

针对某330 MW机组的冷凝-再热烟羽治理系统进行测试和核算，评价该烟羽治理系统的运行水平和对非常规污染物的减排效果。测试结果表明，该系统投运后烟气系统各项参数均达到了设计目标值。烟气冷凝器回收烟气凝结水23.93 t/h，凝结水含溶解性固体93 mg/L，烟气凝结水水质优良，可以直接引入化学水车间超滤工艺前进行后续处理，降低了水处理成本。根据冷凝器后烟气液态水中溶解性固体总排放量为4.47 kg/h和烟气凝结水中溶解性固体总含量为2.00 kg/h计算，烟气冷凝器对烟气溶解性固体的去除率为30.97%。研究结果表明，对燃煤硫分较低且已实现超低排放的机组，烟气中溶解性固体的含量较低，烟气冷凝器对溶解性固体的减排潜力有限。根据成分分析，溶解性固体的去除率与其溶解度有很大关系，水溶性越强，去除率越高。

Evaluation of Wet Plume Treatment with Condensation-Reheat Process for a330 MW Coal-Fired Unit

Based on the testing and assessment result of the wet plume treatment system of a 330 MW unit with condensation-reheat process,its operational performance and unconventional contaminant removal effect are evaluated.The test results show that all parameters have reached the designed target value since the system was put into operation.Through the condenser,there are 23.93 t/h condensed water collected from the desulfurized flue gas with soluble solid of 93 mg/L,which can been reused into ultrafiltration treatment process directly such that the water processing cost is greatly reduced.As there are 4.47 kg/h soluble salt emission in dehumidified flue gas and 2.00 kg/h in condensed water from desulfurized flue gas,the soluble salt removal efficiency through flue condenser is calculated to be 30.97%.The study results show that for those units burning low sulfur content coal and with ultra-low emission already achieved,its potential of emission reduction is very limited because the total contents of soluble salt in the emissions are quite low.The component analysis exhibits high dependency of soluble salt removal efficiency on its solubility if its concentration is low in flue gas,which means the stronger solubility,the higher removal efficiency can be achieved.