Abstract
In recent years, it becomes more difficult to procure low-sulfur Delayed Oil Coke (DOC) at a moderate price because of the increase of sulfur content of crude oil and the spread of world-wide demands for DOC.
We have studied flue gas desulfurization (FGD) of the power station exhaust gas in order to keep SOx at the lowest level in case of using low-price high-sulfur DOC.
As a result of the study, it has been decided to adopt Magnesium Hydroxide Gypsum Process which have both advantages of the Limestone Gypsum process and Magnesium Hydroxide process. The facilities have been installed in our Tsukumi Plant and started in operation in July 1998. After adjustment of running condition, it passed the pre-used examination of Kyushu Bureau of International Trade and Industry in September of that year, and is running satisfactorily. We could get the satisfactory desulfurization performance and good quality of gypsum as by-product, and also attempt the planned reduction of cost.
