冶炼烟气回收装置匹配化改造生产实践

金川集团铜业有限公司在用的两套制酸系统530 kt/a和300 kt/a分别建于2005年和2006年，两套系统原设计中转化工序全部采用“3+1”双转双吸的转化流程，2012年合成炉系统大修中率先将530 kt/a系统转化工序升级为“3+2”流程，并增加了配套的余热锅炉，但制酸系统的净化工序和干吸工序并未升级，导致整套系统在匹配性能提升方面存在短板。采用“回”型喷头布置、水平放置的新型等压捕沫器、“塔-槽一体式”浓酸吸收设备等新技术后，吸收塔的吸收率由99.88%上升至99.9%，酸雾含量减少了至少50%，净化工序酸水排放量降低了40%，制酸系统二段电除雾器出口氟元素含量由1.5 mg/m3降低至0.6 mg/m3，烟气杂质去除率提升了60%，吸收塔循环槽容积提升后，制酸系统处理烟气量增加了0.3×105 m3/h（两系统合计）。

Smelting Flue Gas Recovery Unit Matching Production Research And Application

Two sets of 530 kt/a and 300 kt/a acid making systems in use by Jinchuan Group Copper Co., Ltd. were built in 2005 and 2006 respectively. In the original design of the two systems, conversion process adopts "3+1" double conversion and double absorption conversion process. In overhaul of synthetic furnace system in 2012, the 530 kt/a system conversion process was upgraded to "3+2" process, and the supporting waste heat boiler was added. However, the purification process and dry absorption process of the acid making system have not been upgraded, resulting in shortcomings in improvement of matching performance of the whole system. After adopting new technologies such as homocentric square shape sprinkler arrangement, new isobaric foam catcher placed horizontally and "tower tank integrated" concentrated acid absorption equipment, absorption rate of the absorption tower rises from 99.88% to 99.9%, acid mist content reduces by at least 50%, acid water discharge in purification process reduces by 40%, and fluorine content at outlet of second section electric demister of acid making system drops from 1.5 mg/m3 to 0.6 mg/m3. The removal rate of flue gas impurities rises by 60%. After increasing of volume of circulating tank of absorption tower, flue gas treatment capacity of acid making system rises by 0.3×105 m3/h (total of two systems).