关键词: 湿烟羽, 脱白技术, 烟气治理, 烟羽危害

Abstract: The wet desulfurization method plays a major role in the desulfurization system of coal-fired power plants in China, among which limestone-gypsum wet desulfurization is the most widely used. The flue gas after wet desulfurization is usually wet saturated flue gas. If the ambient temperature and humidity of the flue gas are low, it will produce a “wet plume” phenomenon at the chimney. Wet plumes generally appear white or gray, which contains a large amount of water vapor and pollutants. The emergence of wet plumes will be harmful to the environment and human health. Therefore, enterprises adopting plume elimination technology to carry out emission transformation will reduce the emission of pollutants in the flue gas, make the flue gas diffuse better. To better understand the phenomenon of wet plume and help the enterprises to be transformed to choose the technical route that suits them, this work first introduces the wet desulfurization process and the causes of the wet plume formation, followed by the relevant policies issued in some parts of China. The research status of wet plume characteristics (including the length, lift height and elimination characteristics of the wet plume) was summarized. There are many control technologies for wet plume. The mainstream technology can be divided into flue gas condensation technology, flue gas reheating technology and flue gas condensation and reheating technology. The article then applies the temperature and humidity diagram to explain the principle of each control technology, according to the classification of control technology. The applications under the category are reviewed. At the end of the work, the possibility of combined use of control technology is proposed. Under the premise of energy-saving and economical permission, enterprises should try more technical routes to broaden the road for the management of wet plumes.

Key words: wet plume, wet plume elimination technology, flue gas treatment, hazard of plume