【摘要】 为解决循环流化床烟气脱硫(circulating fluid bed-flue gas desulfurization,CFB-FGD)工艺常用的塔内喷粉增湿方式存在的问题,提出新型复合增湿方式,采用粒子动态分析仪(particle dynamics analyzer,PDA)与傅里叶变换红外分析仪(fourier transform infrared spectroscopy,FTIR),对复合增湿不同配比下液–固相浓度分布之间相对关系的变化,以及该变化对脱硫反应过程、黏壁问题的影响进行研究,并与单一塔内增湿方式进行对比。结果表明:CFB-FGD单一塔内增湿方式下液–固两相的浓度分布趋同性较差,易形成过湿颗粒引起黏壁;采用复合增湿能有效提高液–固两相的浓度分布趋同性,有利于改善塔内黏壁问题,但内增湿水量过低不利于脱硫反应高效进行;内增湿水占总增湿水量的比例为78%时比较合适,在此配比下能够有效减轻塔内黏壁并提高脱硫效率。更多还原

【Abstract】 A new composite humidification way was proposed to solve the existing problems of frequently-used in-tower humidification way in circulating fluid bed-flue gas desulfurization(CFB-FGD) technology.With PDA and FTIR,the change of the relative relationship for concentration distribution between liquid phase and solid phase under composite humidification way was studied,the effect on wall deposition of water droplets/wet particle and desulfurization process was analyzed,and the change and effect under composite humidification way was contrasted to single in-tower humidification way.The results show that: The bad homoplasy of two phases concentration distribution is the main reason for forming over wetting particles which cause wall deposition under single in-tower humidification way in CFB-FGD.Under composite humidification way,the concentration distribution homoplasy of two phases can be improved effectively,which is beneficial to reducing wall deposition question.But too less Win-tower(in-tower humidification water quality) has negative impact to desulfurization process.The appropriate Win-tower/Wtotal(quality ratio of in-tower humidification water to total humidification water) value is 78%.The aim of decreasing wall deposition effectively and enhancing whole desulfurization efficiency can be achieved at the same time with this Win-tower/Wtotal value.更多还原