添加剂对小麦秸秆燃烧结渣特性影响的试验研究

摘要

以小麦秸秆为原料,以CaO、NH4H2PO4、(NH4)2SO4、高岭土为添加剂,在不同灰化温度下进行燃烧,对其灰渣的结渣特性进行分析,并且对燃烧后灰渣样品进行SEM-EDX分析,从微观角度对其灰渣形貌和化学元素进行分析.结果表明,在不同温度下,4种添加剂缓解结渣作用效果不同.随着温度的升高,CaO、NH4H2PO4、高岭土均表现出较好的抑制作用,但(NH4)2SO4的结渣作用效果逐渐减弱,说明温度对不同添加剂的抑制作用效果具有显著影响.在温度为900 ℃时,4种添加剂缓解结渣作用效果依次为高岭土 >NH4H2PO4>CaO >(NH4)2SO4,并且高岭土成本价格相对较低,所以更利于在实际生产中应用.%The wheat straw combustion experiments were carried out with CaO, NH4H2PO4, (NH4)2SO4,and kaolin as the additives under different ashing temperature. The effects of additives on ash slag characteristics were investigated in this study. The ash samples were analyzed with SEM-EDX to visualize the micro morphology and chemical elements composition. Results showed that under same temperature,different additives had different effected on slag formation. In different temperature, four additives reduced slagging differently. With an increase of temperature, CaO, NH4H2PO4, and kaolin could inhibit slag formation significantly,but(NH4)2SO4only weakened it gradually. When the temperature reached 900℃,the effects of 4 additives was in order of:kaolin > NH4H2PO4> CaO >(NH4)2SO4. It indicated that temperature could significant inhibit the functionality of the additives in wheat straw combustion. Since kaolin costed less,it will be more economic efficiency in practical pro-duction of slag.