关键词: 湿烟羽治理, 冷凝-再热, 热力系统, 溶解性固体

Abstract: 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.

Key words: wet plume treatment, condensation-reheat, thermodynamic system, soluble salt