Feasibility Study of White Smoke Removal of Flue Gas From Wet Desulphurization in Coal-fired Boiler

Abstract

Wet plume forms when the wet flue gas from the wet desulphurization system exits into the ambient air, which would bring about visual pollution. In order to completely eliminate the phenomenon of wet plume, the mechanism of the generation and de-whitening of "white smoke" was described firstly, and the technical characteristics and application scope of different wet smoke de-whitening were compared. Take a coal-fired boiler in Nantong area as an example, the enthalpy and humidity map was drawn by analyzing the meteorological data from 2014 to 2016, determine the white smoke elimination control zone and the white smoke control line.The worst weather conditions in 2016 were selected as the design basis, and the flue gas condensation heating technology was selected as the de-whitening process route. By analyzing the relationship between temperature drop and temperature rise of white smoke control line, the relationship between condensation temperature and temperature rise range corresponding to different white smoke control lines was obtained, so as to select the most economical condensation temperature and temperature rise range, which provides theoretical reference for the economic operation of flue gas condensation heating and de whitening process.

Keywords

• wet plume
• flue gas de-whitening
• humidity temperature map
• condensation and reheating composite technology