添加剂对Ca(OH)2固磷固硫作用的影响

来源期刊:中南大学学报(自然科学版)2013年第10期

论文作者:宁平 王磊 王重华 田森林 覃扬颂 蒋明

文章页码:4342 - 4350

关键词:固硫;固磷;预混燃烧;黄磷尾气

Key words:sulfur-fixing; phosphorus-fixing; premixed combustion; yellow phosphorus tail gas

摘    要:采用流化床预混燃烧黄磷尾气, 以ZnO,Fe2O3和MgO作为添加剂调质Ca(OH)2。控制黄磷尾气流量为1 m3/h,空气流量为3.6 m3/h,使炉内温度保持在960~980 ℃,考察不同添加剂对Ca(OH)2固磷固硫作用的影响,对吸收剂进行XRD,SEM和EDS物相表征及微区元素分析。研究结果表明:ZnO添加剂会使吸收剂表面形成一层致密的Ca19Zn2(PO4)14,导致吸收剂在短时间内失活。Fe2O3添加剂会同CaO反应形成Ca2Fe2O5,降低SO2的去除率,但Ca2Fe2O5的生成会使P2O5的去除率提高。MgO添加剂可促进SO2和P2O5气体在吸收剂孔径中的扩散,加快含磷晶体颗粒的形成,从而提高吸收剂对SO2和P2O5的去除率。在120 min的反应时间内,MgO添加量为25%时,吸收剂对SO2去除率平均提高7.5%,P2O5的去除率平均提高19.5%。

Abstract: Premixed combustion of yellow phosphorus tail gas was performed in fluidized bed. ZnO, Fe2O3 and MgO were used as additives of Ca(OH)2 sorbent. The effect of additives on the retention of P2O5 and SO2 in Ca(OH)2 was examined at 960-980 ℃, with yellow phosphorus tail gas flowed being controlled at 1 m3/h, and air flowed at 3.6 m3/h. XRD, SEM and EDS techniques were used to analyze and characterize sorbent. The results show that ZnO additive can induce Ca19Zn2(PO4)14 cover sorbent surface and result in the inactivation of sorbent within a short reaction time. Fe2O3 additive can react with CaO to from Ca2Fe2O5, which reduces removal rate of SO2, but improves removal rate of P2O5. MgO additive can promote the spreading of gaseous SO2 and P2O5 in sorbent, accelerate phosphorus crystal particle formation, and consequently improve the removal rate of absorbent toward SO2 and P2O5. When 25% of MgO is presented in sorbent, the removal efficiencies of SO2 and P2O5 increase to about 7.5% and 19.5%, respectively, during 120 min.

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