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Removal of Molten Slag Particles by a Packed Bed of Ceramic Balls under High Temperature

陶瓷球填充床高温去除熔渣颗粒

基本信息

批准号：
07555385
负责人：
YOSHIKAWA Kunio
金额：
$ 0.9万
依托单位：
Tokyo Institute 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-07555385/
关键词：
Coal Ash Slag Packed Bed Ceramic Ball High Temperature Filter

项目摘要

In this research, a new concept of a filter for capturing coal slag particles under high temperature is proposed, where high temperature combustion gas of coal with molten slag particles is introduced into a packed bed of ceramic balls (pebbles). In the packed bed, molten slag particles are captured by the inertial impaction and are extracted as a liquid condensate.In order to demonstrate the technical feasibility of this high temperature filter concept, hot model experiments have been carried out. In these experiments, coal fly ash was injected into a high temperature combustion gas of natural gas to produce combustion gas with molten slag particles, and this combustion gas was introduced into a pebble bed filter composed of refractory materials. The experimental results have successfully demonstrated continuous capture and extraction of slag particles without clogging of the slag extraction hole. At the same time, it has been shown that capture efficiency as high as 97% is achievable, which well coincides with the cold model experiments performed under normal temperature using oil droplets instead of real molten slag particles.One of critical technical problems associated with commercialization of this filter concept is the durability of the pebble materials contacting with molten slag. Thus the durability test of pebble materials against molten slag was conducted using an electric furnace. This test has shown that high purity alumina pebbles show good resistance against molten slag if the operating temperature is 1600ﾟC or less.Finally, some new coal-fired power generation systems combining the pebble bed filter and the high temperature air combustion technologies are proposed, which are environmentally friendly high efficiency systems.

在本研究中，提出了一种用于高温下捕集煤渣颗粒的过滤器的新概念，即将含有熔融矿渣颗粒的煤高温燃烧气体引入陶瓷球(卵石)填充床中。在填充床中，熔融的矿渣颗粒被惯性冲击捕获并以液体冷凝物的形式被提取出来。为了论证这种高温过滤概念的技术可行性，进行了热模实验。在这些实验中，将燃煤飞灰注入天然气的高温燃气中，产生含有熔融矿渣颗粒的燃气，并将这些燃气引入由耐火材料组成的球床过滤器中。实验结果成功地证明了连续捕集和提取渣粒而不堵塞出渣孔。同时，捕集效率高达97%，这与常温下用油滴代替真正的熔渣颗粒进行的冷模实验很好地吻合。这种过滤器概念商业化的关键技术问题之一是卵石材料与熔渣接触的耐久性。为此，在电炉上进行了卵石材料对熔渣的耐久性试验。试验表明，在1600ﾟC及以下的工作温度下，高纯氧化铝卵石具有良好的抗熔渣能力。最后，提出了球床过滤器和高温空气燃烧技术相结合的新型燃煤发电系统，这些系统是环保型的高效发电系统。