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Scientific Studies on Coal Maceral and Ash for Development of Coal Utilization under High Temperature Conditions

煤岩灰分科学研究促进高温条件下煤炭利用

基本信息

批准号：
07455095
负责人：
OHTAKE Kazutomo
金额：
$ 5.63万
依托单位：
TOYOHASHI UNIVERSITY OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455095/
关键词：
Coal Maceral Ash components Ignition temperature Internal structure of char Slag layr Reaction rate 石炭の着火石炭の燃焼特性

项目摘要

In order to develop the utilization technologies for coal under the high temperature conditions, the ignition behavior, the reactivity, the combustion and gasification behaviors of a coal particle on the molten slag layr and the changes of ash components during the reaction were studied experimentally. The relation of these phenomena to the maceral in coal particles and / or char structure within reacting particles was elucidated. So that the maceral and the char structures were able to be one of index to evaluate the reactivities of coal in addition to the fuel ratio and coal types currently applied as the index.The results obtained in this project are summarized as follows :1.The ignition temperature decreases with an increase of the vitrinite content in coal particles.2.Ignition temperature depends on the structure of char. The ignition temperature for coals with the net-work type becomes low.3.The reactivity of a coal particle on the molten slag layr is influenced by the reaction atmosphere. This may be caused by the interaction between the slag layr and ash inside the particle. Under the reducing condition a coal particle is destroyed by the combination of the coal ash with the molten slag, and the reaction rate is accelerated.4.The evaporation rate of pure alkali metal compounds are measured quantitatively in order to elucidate the behaviors of ash vaporization under the high temperature conditions. The effect of the existence of ash particles on the evaporation temperature is also tested, so that the ash particles act the fall of evaporation temperature of alkali metal compounds.

为了开发高温条件下煤的利用技术，对煤粉在熔融渣层上的着火行为、反应性、燃烧和气化行为以及反应过程中灰分的变化进行了实验研究。阐明了这些现象与煤颗粒中的显微组分和/或反应颗粒中的焦炭结构的关系。因此，除了目前采用的燃煤比和煤种以外，显微组分和煤焦结构也可以作为评价煤的反应性的指标之一。本项目的研究结果如下：1.着火温度随着煤粒中镜质组含量的增加而降低。2.着火温度取决于煤焦的结构。网状型煤的着火温度较低。3.反应气氛对煤粒在熔渣层上的反应活性有影响。这可能是由于渣层与颗粒内灰分的相互作用所致。在还原条件下，火山灰与熔渣的结合破坏了煤粒，加快了反应速度。4.定量测定了纯碱金属化合物的挥发速率，以阐明高温条件下灰分的蒸发行为。还考察了灰粒的存在对蒸发温度的影响，从而使灰粒起到碱金属化合物蒸发温度下降的作用。