Improving mass transfer characteristics of limestone slurries by use of magnesium sulfate
Improving mass transfer characteristics of limestone slurries by use of magnesium sulfate
复制标题
DOI：
10.1021/es60117a003
复制
发表时间：
1976-06
影响因子：
11.4
通讯作者：
W. Cronkright;W. J. Leddy
中科院分区：
文献类型：
--
作者：
W. Cronkright;W. J. Leddy
石灰石洗涤浆液的传质系数差限制了喷雾式洗涤器脱除电厂烟道气中SO/SU2/的有效性。由于石灰石或亚硫酸钙在吸收过程中需要溶解，所以液体中的大阻力是这种低效的原因。实验工作表明，在浆料中加入硫酸镁可以大大消除这些阻力，从而获得接近于强碳酸钠溶液的效率。文中对所涉及的化学过程进行了详细的描述，并提供了硫酸盐添加对浆体溶解洗涤能力的影响的实验数据。亚硫酸镁离子对，MgSO/SUB3//SUP0/，被证明是提高洗涤效率的原因。此外，人们还发现，含有硫酸镁的泥浆可以用空气处理，将亚硫酸盐污泥转化为可过滤的石膏。
Poor mass transfer coefficients for limestone scrubbing slurries limit the effectiveness of spray-type scrubbers in removing SO/sub 2/ from power plant stack gases. Large resistances in the liquid phase, due to the need for limestone or calcium sulfite to dissolve during the absorption process, are the cause of this inefficiency. Experimental work is presented to show that these resistances can be largely eliminated by addition of magnesium sulfate to the slurry, enabling an efficiency to be achieved that approaches that of strong sodium carbonate solution. A detailed description of the chemical processes involved is given, accompanied by experimental data showing the effect of sulfate addition on the dissolved scrubbing capacity of the slurries. The magnesium sulfite ion pair, MgSO/sub 3//sup 0/, is shown to be responsible for the increased scrubbing efficiency. As a bonus, it was found that slurries containing magnesium sulfate could be treated with air to convert sulfite sludge into filterable gypsum.