循环流化床锅炉炉内脱硫灰渣的水化特性研究  

STUDY ON THE HYDRATING CAPACITY OF THE DESULFURIZATION SLAG OF CFB BOILER

作　　者：何宏舟[1] 过伟丽 

机构地区：[1]集美大学,福建省清洁燃烧与能源高效利用工程技术研究中心,福建厦门361021 [2]宇星科技发展(深圳)有限公司,广东深圳518057

出　　处：《煤炭转化》2010年第3期72-75,共4页Coal Conversion

基　　金：福建省科技计划重点项目(2006H0088)

摘　　要：比较循环流化床(CFB)锅炉炉内脱硫灰渣与粉煤灰的性质的差异;分析炉内脱硫灰渣的水化胶凝特性,指出活性的Al2O3和活性的SiO2等无定形物质是CFB锅炉灰渣的活性来源,脱硫灰渣中大量存在的CaO和Ⅱ-CaSO4成分对火山灰活性起到了激发作用,使其具有更加明显的胶凝性质;认为CaO和Ⅱ-CaSO4是参与脱硫灰渣水化反应的主要物质,水化过程形成的钙矾石是引起水化产物膨胀的主要原因,水化后SO24-的浓度对钙矾石的长期稳定性有着关键影响,而灰渣中的CaO对水化过程的体积膨胀则起到间接作用.The differences of property between the desulphurization slag of CFB boiler and the fly ash of PF boiler were compared, the hydrating capacity and the gelling property of the desulphurization slag of CFB boiler was analyzed. It was found that the reactivity of desulphurization slag comes from those amorp＇hous material Al2O3 of and SiO2, and although those materials of CaO and Ⅱ-CaSO4 are beneficial to inducing the pozzolanic activity of slag, to increasing its gelling property, they also provide a great expansive force during hydration, which causes the in stability of hydras. The expansibility of hydras is mainly caused by the forming of ettringite during hydration, the concentration of sulfate radical （SO4^2- ） ion in hydras plays a key role for the long-term stability of ettringite, and the CaO in desulphurization slag has an indirect effect on the expansion of hydras.

关 键 词：CFB锅炉 脱硫灰渣 水化特性 膨胀机理 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]