The apparatus consists of an absorption tower, a slurry circulating tank outside the absorption tower and connected with the bottom of the absorption tower, a limestone slurry circulating spraying system and a limestone slurry preparation system. The limestone slurry circulating spraying system consists of a circulating pump and a spraying pipe in the absorption tower, the inlet and the outlet of the circulating pump are connected with the slurry circulating tank and the spraying pipe, respectively, and the outlet of limestone slurry of the limestone slurry preparation system is connected with the slurry circulating tank. The limestone slurry preparation system consists of a limestone powder barn, a screw feeder, and a water/ash mixer, which are at the upper of the slurry circulating tank and connect from upper to down. The outlet of limestone slurry of the ash/ water mixer is connected with the slurry circulating tank. The slurry circulating tank is set with a stirrer inside and an oxidising air device(grid type) at the bottom, and is a underground tank. The apparatus also contains a slurry discharging pump and a gypsum dewatering system. The apparatus has the advantages of simple structure, less occupied land, and low manufacturing, installation and running costs, and is suitable for desulfurisation of flue gas from small type coal-fired units.
Authors: Tang, Xiaojian; Li, Bin; Cui, She; Wang, Qiang; Yang, Xiaogang; Yang, Binyi; Shao, Xinsheng. ;Full Source: Faming Zhuanli Shenqing CN 102,266,716 (Cl. B01D53/80), 7 Dec 2011, Appl. 10,185,243, 4 Jul 2011; 6pp. (Ch) ;