Phosphorus-fixation by hydrated lime in fluidized bed combustion of yellow phosphorus tail gas
Phosphorus-fixation by hydrated lime in fluidized bed combustion of yellow phosphorus tail gas
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发表时间：
2013
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通讯作者：
Qin Yangsong
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作者：
Qin Yangsong
在流化床预混燃烧黄磷尾气的过程中，进行了熟石灰脱除五氧化二磷的试验，通过改变空燃比，考察了温度对熟石灰对五氧化二磷截留率的影响，XRD，采用SEM和EDS技术对新鲜吸附剂和反应后的吸附剂进行了分析和表征，并利用FactSage6.2软件包对固体产物进行了预测，结果表明：黄磷尾气流化床预混燃烧的最高温度为1 060 ℃，在空燃比为1.7 ~ 4.2的范围内，温度可稳定在870 ℃以上，脱硫剂能与五氧化二磷发生反应，脱硫效率随温度的升高而提高，1 060 ℃时熟石灰对五氧化二磷的去除率为86%，固体产物预测结果与实验结果基本一致。
Hydrated lime was tested for removing phosphoric pentoxide during the premixed combustion of yellow phosphorus tail gas in fluidized bed.The effect of temperature on the retention of phosphoric pentoxide in hydrated lime was examined by changing air fuel ratio.XRD,SEM and EDS techniques were used to analyze and characterize fresh sorbent and sorbent after reaction.The computer software package FactSage6.2 was used to predict solid product.The results show that the highest temperature of yellow phosphorus tail gas premixed combustion in fluidized bed is 1 060 ℃.Within flow ratio of air to fuel from 1.7 to 4.2,the temperature can be stabilized above 870 ℃.The sorbent can react with phosphoric pentoxide and removal efficiencies increase with the increase of the temperature.Phosphoric pentoxide removal by hydrated lime is 86% at 1 060 ℃,47% at 920 ℃,and 30% at 870 ℃ in fluidized bed,respectively.The sorbent reacts with phosphoric pentoxide firstly forming basic calcium phosphate,and then changing into calcium phosphate.At high temperature,calcium phosphate changes into calcium pyrophosphate.Solid product predicted results are consistent with the experimental results.