Studies on Magnesium-Based Wet Flue Gas Desulphurization Process with a Spray Scrubber

Abstract

As China became the largest SO2 emission country in the world after 1999, the State Environmental Protection Administration has targeted to reduce the national SO2 emission level since 2000, which required that all new thermal power units as well as the most existing ones must have flue gas desulphurization (FGD) systems installed. The domestic research on flue gas desulphurization is becoming the hottest topic in environmental science and engineering over the years. The sulphur dioxide removal was first applied in 1930s, nearly 100 different FGD processes and process variations have been studied. However, only a few results have been applied in the industry. Among these techniques, wet FGD processes are the most widely used in most countries because of their high desulphurization efficiency. The magnesium-based wet FGD process is one of the techniques to meet these requirements, which has been increasingly used on the industrial boiler in China because of its low investment, compact flow sheet, less land occupied, high efficiency, reliable operation, rare fouling and low price of the magnesium-based absorbent. MgSO4 is the byproduct from magnesium-based wet FGD process and can be sold as fertilizer. Though the FGD processes have been studied by a number of researchers, it should be noted that the magnesiumbased wet FGD process has not been the subject of many studies. The present work was undertaken to make a systematic Studies on Magnesium-Based Wet Flue Gas Desulphurization Process with a Spray Scrubber