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Upgrading and Slurrification of Low Rank Coals

低阶煤的改质和浆化

基本信息

批准号：
08044154
负责人：
USUI Hiromoto
金额：
$ 3.52万
依托单位：
Kobe University (1997-1998)Yamaguchi University (1996)
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08044154/
关键词：
Coal Energy Low Rank Coal Slurry Upgrading Additive Surface Modification

项目摘要

The utilization of low rank coal has benefit for the strategy of safe and stable energy supply and for the reduction of energy cost. However, the use of low rank coal is at mining site is limited. The development of cheaper and safer handling and transportation technology is necessary to increase the utilization of low rank coal. Among the low rank coals, some kinds of Brown coals or Lignite have good quality i.e. low ash content, high volatile matter content and low sulftu' content. However, they contain quite a large amount of water, and once the low rank coal is dried, the spontaneous burning becomes a severe problem. Thus the development of effective upgrading technology is a key point for the utilization of low rank coals.The most effective upgrading method seems to be consisted of the combined process of the drying, surface modification by heating up to 300*400* and tar coating. In this joint research. Kobe University and Yatnaguchi University have developed the combined upgradin … More g process of vacuum drying and tar coating. and it was shown that the upgraded coal obtained in this process was good quality with reduced cost. ITB(Institute of Technology. Bandung. Indonesia) has developed the combined upgrading process of Super-heated steam drying and tar coating. The upgraded coal thus obtained was also proved to have a good quality. However, we don't have any certification that such upgraded coals are free from the spontaneous burning during the storage and transportation. The evaluation of the spontaneous burning of the upgraded coals is the key echnology for the future study of upgrading the low rank coats.The other chose the upgrading process is to employ the wet upgrading process. The representative wet process is the Hydro-Thernat Dewate.ring Process (HTD Process). This process is consist of the heating process of coal-water mixture up to 300*400* and the coat water preparation process. The surface characteristics of low rank coal is modified under high temperature and high pressure. Kogoshima University has revealed out the upgrading effect on the low rank coal under HTh process. Monash University employed the combined process of HTh and the mechanical expression processes. The resulting coal waler slurries showed a good quality for the direct burning in the slurry combusting boilers. The rheotogical characteristics of coal water slurries was investigated at University of Melbourne and University of Newcastle. Also, both Yamaguchi University and Kobe University gave the index for the selection of effective additives for the preparation of upgraded coal water slurries. Less

低阶煤的利用有利于实施安全稳定的能源供应战略，有利于降低能源成本。然而，低阶煤在矿区的使用是有限的。为了提高低阶煤的利用率，有必要开发更便宜、更安全的装卸和运输技术。在低阶煤中，某些褐煤或褐煤具有灰分低、挥发分高、硫分低的品质。然而，它们含有相当大量的水，一旦低阶煤干燥，自燃就成为一个严重的问题。因此，开发有效的提质技术是低阶煤利用的关键。最有效的提质方法似乎是由干燥、加热至300*400*表面改性和焦油涂覆的组合过程组成。在本次联合研究中。神户大学和 Yatnaguchi 大学开发了真空干燥和焦油涂层的组合升级工艺。结果表明，该工艺得到的提质煤质量好，成本低。 ITB（印度尼西亚万隆理工学院）开发了过热蒸汽干燥和焦油涂层联合升级工艺。由此获得的提质煤也被证明具有良好的品质。然而，我们没有任何证明表明这种改质煤在储存和运输过程中不会自燃。改质煤自燃性的评价是今后低阶煤改质研究的关键技术。另外一种改质工艺的选择是采用湿法改质工艺。代表性的湿法工艺是 Hydro-Theernat Dewate.ring 工艺（HTD 工艺）。该工艺由煤水混合物加热至300*400*过程和涂层水制备过程组成。低阶煤在高温高压下表面特性发生改变。小儿岛大学揭示了 HTh 工艺对低阶煤的提质效果。莫纳什大学采用了 HTh 和机械表达过程的结合过程。所得煤浆表现出良好的质量，适合在浆料燃烧锅炉中直接燃烧。墨尔本大学和纽卡斯尔大学对水煤浆的流变特性进行了研究。山口大学和神户大学也给出了制备提质水煤浆的有效添加剂选择指标。较少的