中温烟气蒸发脱硫废水干燥过程及产物特性分析

发布时间：2018-05-10 14:40

  本文选题：中温蒸发 + 脱硫废水　； 参考：《煤炭学报》2017年07期

【摘要】：为研究中温烟气旁路蒸发实现脱硫废水"零排放"处理的干燥过程与产物特性,通过建立中试试验装置,在真实烟气环境下研究了中温烟气蒸发脱硫废水过程中的温度变化、产物成分、表观形貌及颗粒团聚特性,结果表明,与低温烟气相比,中温烟气蒸发脱硫废水能够灵活控制干燥塔出口烟温,干燥过程温度变化更为平缓,干燥更加迅速与可靠;脱硫废水干燥产物主要是MgSO_4·H_2O,CaSO_4·0.5H_2O,NaCl,其颗粒为表面粗糙多孔或不完整的空心球体,且颗粒平均粒径远大于粉煤灰平均粒径;粉煤灰中掺入脱硫废水干燥产物后,其比电阻随温度的升高先减少后略有增大,但在120℃后与原粉煤灰的比电阻差别不大;干燥过程中废水雾滴与粉煤灰颗粒碰撞团聚后形成链状、球状或者不规则簇状团聚物,使得颗粒粒径进一步增大,有利于静电除尘的高效收集。蒸发过程中少量HCl析出对烟气系统的影响以及干燥产物对粉煤灰综合利用的影响可分别通过脱硫废水调质与增加单独收尘设备进行解决。
[Abstract]:In order to study the drying process and product characteristics of flue gas bypass evaporation to achieve "zero discharge" treatment of desulphurization wastewater, the temperature change in the process of flue gas evaporation desulfurization wastewater was studied in the real flue gas environment by setting up a pilot test device. The results showed that compared with low temperature flue gas, the flue gas evaporation desulfurization wastewater at medium temperature can flexibly control the flue gas temperature at the outlet of the drying tower, and the temperature change in the drying process is more gentle, and the drying process is more rapid and reliable. The drying product of desulphurization wastewater is mainly MgSO_4 H _ 2O _ 4 / CaSO _ 4 _ 0.5H _ 2O _ 4 NaCl.The particles are hollow spheres with rough, porous or incomplete surface, and the average particle size is much larger than the average diameter of fly ash. The specific resistance decreases first and then increases slightly with the increase of temperature, but it has little difference with the original fly ash after 120 鈩，

本文编号：1869710