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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

基本信息

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

项目摘要

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.

本文主要研究了石灰石在煤粉燃烧过程中对硫氧化物和卤素的脱除能力。讨论了煤中矿物与石灰石反应对SO_2捕集的影响。本研究所用的三种中国煤（YZHS煤（含硫量=5.7wt%）、DT煤（含硫量=1.7wt%）、VZLS煤（含硫量=0.6wt%））具有显著的矿物组成和粒度分布。对煤与石灰石（硫钙摩尔比为1：3）混合燃料进行了燃烧试验。通过对粉煤灰的CCSEM分析，评价了添加的石灰石与硫和矿物的反应。YZHS煤中高岭石含量较DT煤和YZLS煤低，矿物粒度较大。煤种对石灰石的脱硫、脱氯能力有很大影响。浸渍煤燃烧时脱硫效率较高，部分原因是由于吸附剂与煤基质接触紧密，部分钙吸附在煤表面，容易吸附硫，抑制了钙与煤中矿物质的反应。此外，还研究了醋酸钙在煤中的浸渍法，使醋酸钙在煤颗粒表面均匀分散。醋酸钙分解率高，降低了其在炉内的烧结程度。这两个因素都有助于DT燃烧中较高的脱硫效率。在上部1200℃、下部900℃的DTF中，以醋酸钙为吸收剂，脱硫效率可达80%以上，而以石灰石为吸收剂，脱硫效率仅为55%。醋酸钙的硫酸化速率越大，灰中形成的石膏和石膏/铝硅酸盐越多。