摘要
本文针对广西某含铜危废处理项目吹炼工段含As_(2)O_(3)冶炼烟气同时脱除二噁英的环保要求,设计过程中将“急冷+袋式收砷”干法收砷技术与“急冷+活性炭吸附”二噁英脱除技术相结合,拟采用“急冷脱酸+活性炭吸附+袋式收砷”的耦合工艺方案处理复杂烟气。由于烟气露点温度高约150~165℃,接近170℃的急冷出口要求温度,设计拟采用急冷脱酸塔,通过高速离心雾化器喷入雾化石灰浆液,实现烟气急冷的同时,脱除烟气中SO_(3)从而降低烟气露点,保证管道和设备不腐蚀。最后根据现场运行可能出现的问题,通过温度控制、烟道冷风阀和雾化器自清洗设备等辅助手段对耦合工艺运行进行初步探讨。
A copper-containing hazardous waste treatment project in Guangxi is required to dispose the As_(2)O_(3)-containing offgas from converting while removing dioxins.To address this environmental requirement,the design of the process combines the dry arsenic collection technology of“quenching+bag-filtering arsenic collection”and the dioxin removal technology of“quenching+activated carbon absorption”.Hence,the coupled process scheme of“quenching/deacification+activated carbon absorption+bag-filtering arsenic collection”is proposed in this paper to treat complex offgas.Since the dew point temperature of offgas is around 150-165℃,close to the required quenching outlet temperature of 170℃,the quenching/deacidification tower is proposed in the design.By spraying in lime slurry through a high-speed centrifugal atomizer,the offgas is quenched while SO_(3)is removed thus reducing the dew point of the offgas and avoiding pipes and equipment from corrosion.Finally,based on the possible issues in field operation,the coupled process operation is briefly discussed in regard to auxiliary devices,such as the temperature controller,flue cold-blast valve,and atomizer self-cleaning device.
出处
《有色设备》
2022年第6期75-78,84,共5页
Nonferrous Metallurgical Equipment
