| Limestone gypsum wet flue gas desulfurization technology is the most widely used in domestic and abroad. It is famous for its high desulfurization efficiency, reliable technology and strong adaptability of coal. Because most of the domestic thermal power plant desulfurization system design standards are low, can not meet the latest ultra low emissions of environmental protection requirements, so a large number of domestic thermal power plant started the transformation of desulfurization capacity.This paper to Huaneng an power plant 600 MW unit limestone- gypsum wet flue gas desulfurization system as the object of study by the existing desulfurization system thoroughly, to identify the impact of ultra low emission is the main factor, B & W company tray tower design software is used on the tray, spray layer, in addition to the mist and smoke flow numerical simulation, proposed the absorb ratio, tray, spray layer, except the mist eliminator and gas flow optimized design and renovation project, analyzes the feasibility and implementation of tower liquid gas.The field performance test was carried out on the modified desulfurization system, and the system data collected from the SO2 emission concentration and soot emission concentration of two important environmental indicators were compared and analyzed.The results show that the tray tower liquid to gas ratio, tray, spray layer, in addition to the mist and smoke flow optimized design scheme is feasible; at full load, the desulphurization system outlet SO2 average concentration, average desulfurization efficiency and the chimney inlet dust concentration can reach the requirements of ultra low emission. |
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