Gravity separation and its effect on CO2 gasification
Gravity separation and its effect on CO2 gasification
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DOI：
10.1016/j.fuel.2011.10.074
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发表时间：
2013
期刊：
影响因子：
7.4
通讯作者：
M. Nonaka;T. Hirajima;K. Sasaki
中科院分区：
文献类型：
--
作者：
M. Nonaka;T. Hirajima;K. Sasaki
以CO2为燃料的整体煤气化联合循环（IGCC）发电技术具有高效节能的特点，是一种很有前途的节能减排技术。最近的研究发现，当贱金属与煤焦基质在原子水平上相互作用时，它们可以改善煤焦气化。研究了目前最流行的洁净煤技术之一重介分选对CO2半焦气化的影响。在进行沉浮试验和热重分析之前，将来自中国的大同煤研磨至20目以下，这是通常用于煤炭清洁过程的尺寸。浮沉试验表明，比重为1.45时，分离效率最高。灰分含量将从10.2%显著降低到约10%。4%和约85%的可燃物将被回收。不同比重馏分的半焦气化反应活性不同，重馏分的半焦气化反应活性高于轻馏分的半焦。这种趋势与灰分含量一致;较重的馏分具有较高的灰分含量。从惰质组中的丝质体和半丝质体中的有序孔中除去灰分可能会增加气化反应性。
The CO2-blown integrated coal gasification combined cycle (IGCC) is a promising electric power generation technology that will reduce CO2emission, due to its high efficiency. Recent studies have found that base metals improve the coal char gasification in cases when they can interact with the char matrix at an atomic level. In this paper, we clarified the effect of heavy medium separation, which is one of the most popular coal cleaning technologies, on the CO2char gasification. Before sink and float test and thermogravimetric analysis, Datong Coal from China was ground to below 20 mesh, which is a size usually used for a coal cleaning process. The float and sink test revealed that the highest separation efficiency would be obtained at a specific gravity of 1.45. The ash content would be reduced dramatically from 10.2% to ca. 4% and about 85% of combustibles would be recovered. The chars derived from different specific gravity fractions showed different gasification reactivity; the char from heavier fraction has gasification reactivity higher than the lighter fraction-derived char. This tendency agrees with the ash content; the heavier fraction has a higher ash content. Removal of ash from well-ordered holes in Fusinite and Semi-fusinite in Inertinite might increase the gasification reactivity.