摘要
石灰石或石灰湿法烟气脱硫（ＷＦＧＤ）在中试湿壁吸收塔中被实验研究。实验结果表明，石灰比石灰石有更强的脱硫反应活性。石灰工艺的Ｌ／Ｇ比可以比石灰石的控制得低些，适合的ｐＨ值操作范围分别是５５～６２和５０～５５。以中试湿壁塔为原型的石灰石ＷＦＧＤ模型预测的沿塔脱硫率和浆液ｐＨ值的变化、Ｌ／Ｇ比和ｐＨ值对脱硫率的影响能较好地与实验数据吻合。石灰石ＷＦＧＤ强制氧化工艺比自然氧化工艺具有更高的脱硫率。强制氧化的副产物９７％以上为石膏，其颗粒的名义直径为３２μｍ，而自然氧化的副产物主要是亚硫酸氢钙和１０％以下的石膏。
Limestone or lime wet flue gas desulfurization (WFGD) was investigated in a pilot scale wetted wall column.The experimental results show that the lime process has higher removal efficiency of SO 2 than the limestone process.The lime process can be operated at a lower L/G ratio than the limestone process.The suitable operating ranges of pH for lime and limestone are 5 5～6.2 and 5.0～5.5,respectively. The limestone WFGD model,based on the pilot scale wetted wall column,was verified with experiments.The model predictions are in good agreement with the experimental data such as the degree of desulfurization and slurry pH profile along the column,and the effects of L/G ratio and pH value on SO 2 removal.The forced oxidation mode of limestone WFGD has higher removal efficiency of SO 2 than the natural oxidation mode.The by product from the forced oxidation is gypsum that contains above 97% CaSO 4·2H 2O.The mean diameter of gypsum crystals is 32μm.The by product from the natural oxidation is a mixture of calcium bisulfite and below 10% gypsum which has the mean diameter of 2.1μm.
出处
《南京理工大学学报》
EI
CAS
CSCD
1999年第2期157-161,共5页
Journal of Nanjing University of Science and Technology
基金
国家留学基金
江苏省青年科技基金
关键词
烟气脱硫
石灰石
强制氧化
工艺实验
WFGD
湿法
flue gas desulfurization,limestone,lime
forced oxidation,natural oxidation
