| 摘要 |
<p>PROBLEM TO BE SOLVED: To remove sulfur oxides in a flue gas with high efficiency, make it hard to generate cloggings in a tank, pipings, and the like, and improve the workability thereof by using a small amount of a calcium carbonate satisfying a specified formula. SOLUTION: Generally, the removal effect on sulfur oxides in a flue gas is in proportion to the area of reaction with a removing agent. Thus, the primary particle diameter of a fluid gas desulfurization calcium oxide is required to be smaller and its specific surface area is larger than those of conventional calcium carbonate for the purpose of removing the sulfur oxides with high efficiency. It is, therefore, necessary that the primary particle diameter dx1 of the calcium carbonate is 0.005>=dx1>=0.2μm, preferably approximately 0.008>=dx1>=approximately 0.15μm, more preferably approximately 0.01>=dx1>=approximately 0.1μm. Also the BET specific surface area Sw1 based on the nitrogen adsorption process for the calcium carbonate is required to be Sw1>=20 m2/g, preferably Sw1>=approximately 25 m2/g, more preferably Sw1>=approximately 30 m2/g.</p> |
