高效脱硫协同除尘关键技术分析

Analysis on Key Technologies of High Efficiency Desulfurization and Collaborative Dust Removal

为系统研究高效脱硫协同除尘技术,分析了已投运的高效脱硫协同除尘典型机组的实际应用情况,从而明确了高效脱硫协同除尘技术需同步考虑低低温电除尘技术和高效脱硫技术。低低温电除尘技术应严控烟温、灰硫比,并做好流场、流速设计及材质选择以防止烟气冷却器磨损泄漏;高效脱硫技术应优化塔内喷淋层和除雾器层流场、设置合理塔内设施间距和流速,并保证足够的喷淋覆盖率、配置合适的喷嘴和除雾器。通过低低温电除尘技术和高效脱硫技术的协同作用可有效地实现SO2和烟尘的超低排放,因此"低低温电除尘技术+高效脱硫协同除尘技术"是烟尘和SO2超低排放的一条优选技术路线。

In order to systematically study the technologies of high efficiency desulfurization and collaborative dust removal, the actual application status of high efficiency desulfurization and collaborative dust removal in typical unit has been analyzed. It is clarified that to implement high efficiency desulfurization and collaborative dust removal technology the low-low temperature electric dust removal technology and high efficiency desulphurization technology should also be taken into account. The low-low temperature electric dust removal technology requires not only strict control on smoke temperature and ratio of ash to sulfur but also well-designed flow field, flow rate and the proper material selection to prevent the flue gas cooler from wearing and leaking. High efficiency desulfurization technology requires optimized tower spray layer and demister layer flow field, reasonable tower facilities spacing and flow rate settings as well as adequate spray coverage and appropriate nozzle and defogger configuration. The ultra-low emission of SO2 and dust can be realized effectively by virtue of the synergistic action of low temperature electric precipitating technology and high efficiency desulphurization technology. Therefore, the low-low temperature dust removal technology in combination with efficient desulfurization synergistic dust removal technology is a more preferred technical route for dust and SO2 ultra-low emission.