【作者】 杨小玲；

【导师】 王水利；

【作者基本信息】 西安科技大学 ， 矿物加工工程， 2004， 硕士

【摘要】 目前在煤中固硫方面存在的问题之一是固硫率低。添加剂的加入改善了固硫效果，但是由于助剂添加量一般很少，加之煤的稀释效应，致使助剂的助固硫作用因与固硫剂得不到充分接触而得不到充分发挥，因而导致固硫率很难大幅度提高。本文选择了自身含助剂的天然石灰石作为固硫剂，利用天然岩石在形成伊始就具有的助剂组分与固硫剂组分均匀分布的特点，以消除助剂和固硫剂的反应界面性差的问题，使助剂的助固硫作用得以充分发挥。 本文选用了六种天然含助剂的灰岩：铁质灰岩、晶粒灰岩、锰质灰岩、块状灰岩、硅质灰岩和泥质灰岩作为天然含助剂型固硫剂。实验结果表明，固硫率随温度升高而降低，当固硫温度达1150"C时，固硫率降到2096以下;随固硫剂含量增加而升高，900℃下固硫剂含量为25％的锰质灰岩固硫率达到了79．35％固硫效果最好的固硫剂是铁质灰岩，最差的是硅质灰岩，800℃固硫率分别为77.74％和64．84％；型煤固硫率均较散煤的高，其中铁质灰岩1150℃固硫率较散煤提高了59．72％。 对固硫后灰渣进行了x射线衍射分析和SEM分析。结果表明，灰渣中除了含常规固硫物相硫酸钙外，还有新晶相硫铝酸钙和硫酸钙复合物生成。天然含助剂型固硫剂通过改善固硫助剂与固硫剂的反应界面性来提高固硫反应的活性，使常规固硫产物硫酸钙高温下转化更为稳定的硫酸钙复合物，提高了固硫率。更多还原

【Abstract】 At present，low desulfurization rate is one of the problems in desulfurizationduring coal combuaion．Blending additives improve desulfudzation effect，while fortheir very small ratio in coal and dilution effect of coal，blending additives’assistfunction call’t get used sufficiently,because of not enough touch between them anddesulfurization agents，SO that desulfurizafion rate can’t rise up considerably．Crudelimestone with assistant components inherent is selected as desulfurization agents inthis paper．Making the most use of their characteristes of the assistants and thedesulfurization components even distribution originally,in order to eliminate weaknessof their reaction interface，assisting desulfurization function of the assistantcomponents gets sufficiently used． Six kinds of limestone with assistants components inherent areselected：ferruginous limestome，crystalline limestone，maganase limestone，blocklimestone，siliceous limestone and argillaceous limestone as Novel Desulfurizati’onAgents with Inherent Assistants in this paper．Experimental result shows thatdesulfurization rate reduce with the elevation temperature，under 20％whentemperature rising up to 1150℃；the rate advances as desulfurization agents contentin coal increases，the desulfurization rate with 25％content of maganase limestonein coal as desulfurization agent is 79．35％at 900℃；ferruginous limestome is the bestdesulfurization agent in a whole，siliceous limestone the weakest by comparison，desulfurization rates are 77．74％and 64．84％respectively；and desulfurization rate inbriquette is higher than that in coal powder generally,the amount is 59．72％withferruginous limestone as the desulfurization agent． Coal ash after desulfurization is analysed by using XRD and SEM methods．Theresult shows there is new crystalline species GaSO4 compound besides CaS04．NovelDesulfurization Agents，itll Inherent Assistants enhance reaction activity throughimproving their reaction interface properties，converting CaS04 into more stablematter CaS04 compound at high temperature，as a reset，desulfurization rate increase．更多还原