The current situation and subject of the fuel gas desulfurization process

Abstract

Coal is an important energy source in East Asia. Acid rain caused by emissions of sulfur dioxide is an environmental issue on a global scale. Environmental protection is the most important subject. This author investigated environmental regulations and the current situation of flue gas desulfurization (FGD) at coal-fired power plants. The author compared the advantages of main FGD processes: the limestone gypsum process, the sea water washing process, the catalyst SOx oxidation process (CASOX), the activated carbon heating desorption process, the lime-base spray dry process, the furnace limestone injection process and electron beam. In order to select an appropriate FGD process, it is necessary to compare both the technological and economical advantages. Consequently, since the limestone gypsum process has a performance of more than 95 % removal of sulfur dioxide, it is suitable for a large capacity coal-fired power plant. The lime-base spray dry process and CASOX process are simple, so they are more suitable for a small capacity coal-fired power plant.