1 000 MW燃煤发电机组碱渣脱硫试验研究

碱渣是氨碱法生产纯碱过程中产生的废渣工业固体废弃物和污染物，开发其高附加值利用具有显著的经济和环境效益。针对碱渣作为燃煤电厂湿法烟气脱硫系统脱硫剂的应用开发，在某1000 MW燃煤发电机组、设计采用石灰石-石膏湿法烟气脱硫工艺的烟气脱硫装置系统上进行了碱渣完全替代石灰石脱硫的首次工业化试验；基于与石灰石脱硫的系统比较，研究和评价了碱渣脱硫的性能及其影响。试验验证了在大型燃煤机组湿法烟气脱硫系统上碱渣能够完全替代石灰石脱硫；碱渣脱硫可提升烟气脱硫的脱硫效率，实现超低排放，对副产品石膏品质几无影响；碱渣替代石灰石作为脱硫剂，可保证可靠供应，且具有廉价、节电和对高硫煤适应性等优势，可取得良好的经济效益。还可以实现以废治废，具有良好显著的环保效益。 关键词：燃煤发电机组；湿法烟气脱硫；脱硫剂；碱渣；固废利用

Experimental investigation on alkaline residue desulfurization of a 1 000 MW coal-fired electricity generation unit

Alkaline residue is an industrial solid waste and pollutant from the process of soda production by ammonia alkali method. Developing its high-value utilizations is of significant economic and environmental benefits. Aimed at To developing the application of alkaline residue from industrial alkali production process as the sorbent for wet flue gas desulfurization in coal-fired power plants, the first ever industrial experiment of using the alkaline residue to substitute limestone was carried out on the flue gas desulfurization system of a 1000 MW coal-fired electricity generation unit designed with a limestone-gypsum wet flue gas desulfurization process. Based on systematical comparison with limestone desulfurization, The the performance as well as influences of the alkaline residue for desulfurization was investigated and evaluated. The experiment proves that the alkaline residue is capable to completely replace limestone in the wet flue gas desulfurization system of large-scale coal-fired power unit. Desulfurization of alkaline residue can improve efficiency of flue gas desulfurization and achieve ultra low emission, and has little influence on the quality of by-product gypsum. Alkaline residue replacing limestone as the sorbent can ensure the reliable supply of the sorbent and has the advantages of lower price and electricity consumption and higher flexibility for higher sulfur coals and can achieve good economic benefits. It also achieves using a waste to control pollution and therefore provides significant environmental benefits. Keywords: coal-fired power generation unit; wet flue gas desulfurization; desulfurization sorbent, alkaline residue; testsolid waste utilization