石灰石及盐类混合物在粉粒喷动床内的半干湿法脱硫

开发一种新型粉粒喷动床半干湿法脱硫过程。在这个过程中，喷动床为一个多相反应器。在喷动床中，二氧化硫与脱硫剂反应，脱除烟道气中的二氧化硫。实验采用石灰石作为脱硫剂，并考察操作条件对脱硫效率的影响。结果表明，脱硫效率受到几个因素的影响：钙硫比、饱和接近度、脱硫剂直径、粗粒子的静床层高度以及气体的表观流速。当石灰石粒径小于5μm、钙硫比大于1．5、饱和接近度为6℃时，脱硫效率可高于90％，而脱硫剂利用率超过60％。一些碱金属化合物可被用作提高脱硫效率和脱硫剂利用率的添加剂。实验结果表明：在喷动床烟道气脱硫过程中，添加氯化钠可显著提高脱硫效率。而且在脱硫浆料中，氯化钠与石灰石之比小于0．2时，脱硫效率随氯化钠浓度增加而增加。这个研究结果表明利用海水制备脱硫浆料成为可能。

Removal of SO2 by Limestone and Some Salt Mixture in a Semidry Process with Powder-Particle Spouted Bed

A new type of semidry flue gas desulfurization (FGD) process with a powder-particle spouted bed (PPSB) had been developed. In this process, a spouted bed was used as a multiphase reactor, where the SO2 in flue gas reacted with desulfurization sorbent slurry, and the SO2 was thereby removed from the flue gas. By use of fine limestone particles as the desulfurization sorbent, the experiments to investigate the effects of operating conditions on the SO2 removal efficiency had been carried out in the FGD process with PPSB. Results showed that the SO2 removal efficiency was affected by the operating parameters such as mole ratio of the calcium to sulfur, approach to saturation temperature, sorbent particle diameter, static bed height of the coarse particles, and the superficial gas velocity. When the limestone particle diameter was smaller than 5 μm and the mole ratio of calcium to sulfur more than 1.5 at an approach to saturation temperature of 6 ℃,it has been obtained that the SO2 removal efficiency was higher than 90 % with the sorbent utilization ratio exceeding 60 %. Some alkali metal compounds have been used as an additive to improve the SO2 removal efficiency and the sorbent utilization ratio. The experimental results showed that the SO2 removal efficiency in the FGD process with PPSB had been remarkably increased by the NaCl addition. Furthermore, with the mole ratio of NaC1 to CaCO3 less than 0.2 in the sorbent slurry, the SO2 removal efficiency increased with the NaCl concentration. This research confirms the possibility of using sea water to prepare the sorbent slurry.