The exact shape and size of the gasification channel during underground coal gasification(UGC) are of vital importance for the safety and stability of the upper parts of the geological formation.In practice existing g...The exact shape and size of the gasification channel during underground coal gasification(UGC) are of vital importance for the safety and stability of the upper parts of the geological formation.In practice existing geological measurements are insufficient to obtain such information because the coal seam is typically deeply buried and the geological conditions are often complex.This paper introduces a cylindrical model for the gasification channel.The rock and soil masses are assumed to be homogeneous and isotropic and the effect of seepage on the temperature field was neglected.The theory of heat conduction was used to write the equation predicting the temperature field around the gasification channel.The idea of an excess temperature was introduced to solve the equations.Applying this model to UCG in the field for an influence radius,r,of 70 m gave the model parameters,u1,2,3...,of 2.4,5.5,8.7...By adjusting the radius(2,4,or 6 m) reasonable temperatures of the gasification channel were found for 4 m.The temperature distribution in the vertical direction,and the combustion volume,were also calculated.Comparison to field measurements shows that the results obtained from the proposed model are very close to practice.展开更多
英国传教士陶然士(T.Torrance)曾长期在中国四川居住,亲身经历过1933年四川叠溪地震。1934年7月,他又到地震现场进行考察,事后写成The Tieh-chi earthquake of August 1933 and afterwards(1933年8月叠溪地震及震后情况)一文,同年11月...英国传教士陶然士(T.Torrance)曾长期在中国四川居住,亲身经历过1933年四川叠溪地震。1934年7月,他又到地震现场进行考察,事后写成The Tieh-chi earthquake of August 1933 and afterwards(1933年8月叠溪地震及震后情况)一文,同年11月发表在The West China Missionary News(华西教会新闻)上。本文介绍了陶然士的生平和他在叠溪地震时的经历,披露了《1933年8月叠溪地震及震后情况》一文的主要内容,并进行了评述。陶然士在他的文章中对叠溪地震灾害及其次生水灾的记述基本客观真实,不少细节可以与地质学家常隆庆的《四川叠溪地震调查记》以及后人的研究成果相互印证,具有一定的科学价值,是又一份珍贵的地震史料。并对进一步发掘有关地震史料等有关问题提出了建议。展开更多
基金supported by a grant from the Major State Basic Research and Development Program of China (No. 2007CB714102)sponsored by the Fundamental Research Funds for the Central Universities (No. 2009B00714)
文摘The exact shape and size of the gasification channel during underground coal gasification(UGC) are of vital importance for the safety and stability of the upper parts of the geological formation.In practice existing geological measurements are insufficient to obtain such information because the coal seam is typically deeply buried and the geological conditions are often complex.This paper introduces a cylindrical model for the gasification channel.The rock and soil masses are assumed to be homogeneous and isotropic and the effect of seepage on the temperature field was neglected.The theory of heat conduction was used to write the equation predicting the temperature field around the gasification channel.The idea of an excess temperature was introduced to solve the equations.Applying this model to UCG in the field for an influence radius,r,of 70 m gave the model parameters,u1,2,3...,of 2.4,5.5,8.7...By adjusting the radius(2,4,or 6 m) reasonable temperatures of the gasification channel were found for 4 m.The temperature distribution in the vertical direction,and the combustion volume,were also calculated.Comparison to field measurements shows that the results obtained from the proposed model are very close to practice.
文摘英国传教士陶然士(T.Torrance)曾长期在中国四川居住,亲身经历过1933年四川叠溪地震。1934年7月,他又到地震现场进行考察,事后写成The Tieh-chi earthquake of August 1933 and afterwards(1933年8月叠溪地震及震后情况)一文,同年11月发表在The West China Missionary News(华西教会新闻)上。本文介绍了陶然士的生平和他在叠溪地震时的经历,披露了《1933年8月叠溪地震及震后情况》一文的主要内容,并进行了评述。陶然士在他的文章中对叠溪地震灾害及其次生水灾的记述基本客观真实,不少细节可以与地质学家常隆庆的《四川叠溪地震调查记》以及后人的研究成果相互印证,具有一定的科学价值,是又一份珍贵的地震史料。并对进一步发掘有关地震史料等有关问题提出了建议。
