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Effect of additives on fusion characteristic
of ashes during rice straw combustion |
MA Xiao-qin1,2, QIN jian-guang1, LUO Zhong-yang1, YU Chun-jiang1,
FANG Meng-xiang1, CEN Ke-fa1 |
1. Stake Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, China, 310027 China;
2.School of Mechanics and Electronics , Henan Institute of Science and Technology ,Xinxiang, 453003 China |
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Abstract In order to provide references and bases for solving the problem of slag and agglomeration that occurred during biomass thermal chemical transformation of straw, experiments on combustion of pure pulverized straw and mixture of pulverized straw with additives were carried out in a pilot plant. The additives which selected by thermal equilibrium calculation included aluminum powder, silicon powder, Al2O3, SiO2, Ca3(PO4)2, CaSiO3, CaCO3, Al2(SO4)318H2O, CaSO4, CaO and (NH4)H2PO4. By analyzing ash samples, we singled out ideal additives. They are (NH4)H2PO4, Al2(SO4)318H2O, CaSO4, CaO and CaCO3. According to XRD measurements, potassium in rice straw can be turned into high melting point of potassium in the form of K2CaP2O7 with (NH4)H2PO4 as additive. CaSO4 and Al2(SO4)318H2O can make potassium be fixed in the form of K2SO4. CaO and CaCO3 are not directly involved in the reaction with alkali metals, but can react to other elements in the system, which promotes potassium in the straw to be separated from bottom ash. The result shows that adding additives to straw is one of the effective ways to solve straw ash fusion problem caused by alkali metals．
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Published: 21 September 2010
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添加剂对稻草灰熔融特性影响的实验研究
为了给生物质热化学转化中灰结渣和聚团问题的解决提供参考和依据, 在小型实验装置上对稻草、稻草与添加剂混合物进行了燃烧试验. 通过热力平衡计算软件选出合适的添加剂, 添加剂包括Al粉、Si粉、Al2O3、SiO2、Ca3(PO4)2、CaSiO3、CaCO3、Al2(SO4)318H2O、CaSO4、CaO、(NH4)H2PO4等, 通过对样品燃烧生成的底灰进行观测分析, 选择较理想的添加剂(NH4)H2PO4, Al2(SO4)318H2O, CaSO4, CaO, CaCO3. 理想添加剂样品底灰的XRD测试结果表明, (NH4)H2PO4可将稻草中钾转化为高熔点的K2CaP2O7；CaSO4和Al2(SO4)318H2O则可将碱金属钾以K2SO4形式固定在底灰中；CaO, CaCO3不直接与碱金属反应, 但可与系统中的其它元素进行反应, 促进稻草中熔融态钾的转化析出. 实验结果表明, 添加剂是解决由碱金属引起的秸秆灰熔融问题的有效途径之一.
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