Simultaneous Removal of SOx and Halogens under Combustion of Coal Water Mixture Added Fine Limestone

添加细石灰石的水煤浆燃烧同时脱除SOx和卤素

• 批准号: 11218211
• 负责人: NINOMIYA Yoshihiko
• 金额: $ 19.78万
• 依托单位: Chubu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research on Priority Areas
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11218211/
• 关键词: coal water mixture; desulfurization; CCSEM; coal minerals; pulverized coal combustion; 簡易脱硫; 飛灰; 重金属; CWM; 燃焼プロセス; 脱ハロゲン; coal water mixture; desulfurization; CCSEM; coal minerals; pulverized coal combustion; 簡易脱硫; 飛灰; 重金属; CWM; 燃焼プロセス; 脱ハロゲン

This report mainly focuses on SOx and halogen removal ability of limestone in the pulverized coal combustion. Effects of reactions between internal minerals in the coal with limestone on SO_2 capture are discussed. Three Chinese coals (YZHS coal (Sulfur content=5.7wt%), DT coal (S=1.7wt%), VZLS coal (S=0.6wt%)) used in this study have significant mineralogical composition and particle size distribution of minerals. The combustion experiment was conducted about the fuels that mixed coal and limestone (sulfur to calcium molar ratio is 1 to 3). The reactions of the added limestone with sulfur and minerals were evaluated by CCSEM analysis of fly ashes. YZHS coal has lower kaolinite content and bigger sized minerals than that of DT and YZLS coals. De-S and De-Cl ability of limestone depends strongly on the coal type. The higher desulfurization efficiency was achieved in combustion of impregnated coals, which is in part due to the intimate contact between sorbent and coal matrix, portion of added calcium adhered to coal surface, as a result, could adsorb sulfur readily, the reaction of calcium and inherent minerals was inhibited to larger extent. In addition, impregnation of calcium acetate into coal was developed, which made calcium acetate disperse well on the surface of coal particles. The high decomposition rate of calcium acetate decreased its sintering degree in the furnace. Both factors contributed to the higher desulfurization efficiency in DT combustion. In DTF having upside of 1200℃ and downside of 900℃, using calcium acetate as sorbent obtained the desulfurization efficiency more than 80%, compared to only 55% was obtained using limestone. The greater sulfation rate of calcium acetate led to much gypsum and gypsum/aluminosilicate formed in the ash.

该报告主要集中在粉碎煤混合物中石灰石的Sox和卤素去除能力上。讨论了与石灰石煤中内部矿物之间的反应对SO_2捕获的影响。本研究中使用的三个中国煤（YZHS煤（硫含量= 5.7wt％），DT煤（S = 1.7wt％），VZLS煤（s = 0.6wt％））具有明显的矿物学组成和矿物质的粒度分布。组合实验是关于混合煤和石灰石的燃料（硫与钙摩尔比为1到3）的。通过CCSEM分析，对硫和矿物质的添加的石灰石的反应评估。与DT和YZLS煤相比，YZHS煤的高岭石含量较低，矿物质较大。石灰石的DE-S和DE-CL能力在很大程度上取决于煤的类型。在浸渍煤的组合结合在一起的一部分是由于吸附剂和煤基质基质之间的亲密接触（添加到煤层上的添加钙的一部分）可以使钙硫硫的一部分可随时抑制钙和遗传矿物的反应，从而抑制较大的钙，这是较高的。另外，开发了乙酸钙浸没到煤中，从而使乙酸钙分散在煤颗粒的表面上。醋酸钙的高分解速率下降了炉子中的烧结程度。这两个因素都导致DT组合中较高的脱硫效率。在DTF中，具有1200°且下值900℃的上行空间，使用乙酸钙作为分配的脱硫化效率超过80％，而使用石灰石仅获得了55％。醋酸钙的硫酸化速率更高，导致石膏和石膏/铝硅酸盐在灰烬中形成。