Upgrading and Slurrification of Low Rank Coals

低阶煤的利用有利于我国能源安全稳定供应战略的实施，有利于降低能源成本。然而，低阶煤在矿区的使用受到限制。为了提高低阶煤的利用率，必须开发更廉价、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低灰分、高挥发分和低硫分的优良品质。然而，它们含有相当大量的水，并且一旦低阶煤干燥，自燃就成为严重的问题。因此，开发有效的改性技术是低阶煤资源化利用的关键，干燥、加热至300 × 400 × 10 ~（-1）表面改性和焦油涂覆相结合是最有效的改性方法。在这项联合研究中。科比大学和矢口大学联合开发了 ...更多信息 g.真空干燥和焦油涂布工艺。试验结果表明，该工艺生产的改质煤质量好，成本低。ITB（Institute of Technology）万隆。印度尼西亚）开发了过热蒸汽干燥和焦油涂布联合提质工艺。由此获得的改质煤也被证明具有良好的质量。但是，我们没有任何证明，这些升级煤在储存和运输过程中不会自燃。对改性煤自燃性的评价是今后研究低阶煤改性的关键技术。代表性的湿法工艺是Hydro-Thermat Dewate.ring工艺（HTD工艺）。该工艺由煤水混合物加热至300 × 400 ×的过程和涂层水制备过程组成。在高温高压条件下对低阶煤进行表面改性。小路岛大学揭示了HTh工艺对低阶煤的提质效果。莫纳什大学采用了HTh和机械表达过程相结合的方法。制得的水煤浆在浆态燃烧锅炉中直接燃烧具有良好的品质。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。山口大学和科比大学也给出了制备升级煤水浆的有效添加剂的选择指标。少

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