摘要
为了降低脱硫反应产物层的扩散阻力对于CaO颗粒脱硫反应的影响,提高脱硫反应速率和CFB-FGD工艺中的烟气脱硫率,必须降低CaO颗粒粒径。将分析纯CaO颗粒分别与去离子水和4种分散剂溶液进行水合反应并根据悬浮液分散度对脱硫剂制备工艺进行了必要的优化。对分析纯CaO颗粒与去离子水反应得到的Ca(OH)2颗粒悬浮液和分析纯CaO颗粒与0.006mole/l的(NaPO3)6溶液反应得到的Ca(OH)2颗粒悬浮液分别与飞灰混合、干燥、研磨得到的脱硫剂性能在自行设计制造的小型循环流化床热态实验台(CFBR)上进行了实验研究。实验结果表明:在600°C～800°C范围内,CFBR的烟气脱硫率达到最大值。提高Ca(OH)2悬浮液的分散度是降低CaO颗粒覆盖层厚度和提高脱硫剂在CFB-FGD工艺中的烟气脱硫率的有效方法之一。
For the sake of reducing the negative effect of diffusion resistance of desulfuration products on the CaO desulfurization reaction, and to raise the latter's rate and efficiency in the CFB-FGD technology, particle sizes of CaO should be reduced. Analytically pure CaO particles are hydrated respectively with de-ioned water and other 4 dispersant solutions. The technology of the desulfurizing agents' preparation is to be optimized according to particle dispersion in suspension. Property tests are carried out on a self-developed bench scale circulating fluidized bed reactor. Desulfurizing agents Ca(OH)_2 respectively resulting from CaO particle reaction with de-ioned water and with 0.006mole/l (NaPO_3)_6 solution, is then respectively mixed with fly ash, dried and ground. Test results show that the desulfuration rate of CFBR flue gas gets maximal within the temperature range of 600°C^800°C. An efficient way is by increasing the degree of dispersion of the Ca(OH)_2 suspension for reducing the layer thickness of CaO particles and therewith raising the gas desulfurization efficiency of CFB-FGD technology. Figs3, tables 3 and rets9.
出处
《动力工程》
CSCD
北大核心
2004年第6期893-896,912,共5页
Power Engineering
基金
国家重点基础研究发展规划资助项目(G19990222)
清华大学实验室开放基金。
