Research and application of white smoke treatment and water recovery of 300 MW unit

Abstract

For a 300 MW coal-fired unit, the regenerative heat exchanger is used to design a regenerative heat exchanger cooling water collection and hot air reheat white smoke treatment and water recovery system. According to the system design scheme, the unit performance test is carried out under full load condition. The results show that: this system can effectively solve the white smoke phenomenon of smoke. In the process of reducing the smoke temperature from 54.1 °C to 40.2 °C, a total of 8.68 t/h of water is analyzed, and the water in the flue gas is effectively recovered. It reduces the concentration of particulate matter in the smoke, which has a certain positive impact on the ultra-low emission of flue gas. However, a certain amount of hot secondary air is extracted to heat the tail flue gas, resulting in an increase of coal consumption for power generation by 0.987 g/(kW h). Therefore, the cooling and water collection and hot air reheat technology of regenerative heat exchanger has certain limitations, and the technology of smoke waste heat recovery will be the key development and application direction in the future