Abstract
By combining flue gas waste heat utilization technology with multi-effect evaporation and vacuum cooling technology, the concentration and crystallization system of magnesium oxide desulfurization wastewater is optimized, which reduces the cost of desulfurization product production process and increases the extra income of coal-fired power plants. First, the forward-flow benchmark system and the parallel-flow benchmark system are compared. The results show that the specific flue gas heat, specific heat transfer area, specific cooling water and annual profit of the parallel-flow benchmark system are about 83%, 92%, 90% and 101% of those of the forward-flow benchmark system, respectively. Then, different optimization processes are added to the parallel-flow benchmark system and compared. The results show that the specific flue gas heat, specific heat transfer area, specific cooling water and annual profit of the 7-process parallel-flow optimization system are about 94%, 94% ,94% and 101%, respectively, compared with the parallel-flow benchmark system. Finally, the 7-process parallel-flow optimization systems of 300, 600 and 1000 MW coal-fired power plants are compared. The results show that the annual profits of 300, 600 and 1000 MW coal-fired power plants are about 7 million yuan, 15 million yuan and 22 million yuan respectively.
