中国安全生产科学技术
中國安全生產科學技術
중국안전생산과학기술
JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY
2014年
4期
74-79
,共6页
杜志刚%严家平%谢焰%胡水根
杜誌剛%嚴傢平%謝燄%鬍水根
두지강%엄가평%사염%호수근
煤体结构%气体运移%线性渗流%二项式渗流
煤體結構%氣體運移%線性滲流%二項式滲流
매체결구%기체운이%선성삼류%이항식삼류
coal structure%gas migration%linear seepage%binomial seepage
利用自行研制的装置,以氮气模拟瓦斯,以同一压力下压实的不同粒径煤样制作不同煤体结构构造煤;气源以恒定压力向煤体持续注气,使煤体吸附一段时间后,停止注气,打开放气阀,使煤体开始解吸,进行了煤体结构差异对气体运移影响的试验研究。结果表明:构造煤体的气体运移特征有线性渗流和二项式渗流。当组成构造煤体的煤颗粒粒径较大时,在流量达极值前,通过煤体的气体流量随时间的变化成线性关系,此时煤体内气体的运移特征符合线性渗流。当组成构造煤体的煤颗粒粒径较小时,在流量达极值前,通过煤体的气体流量随时间的变化成二项式关系,此时煤体内气体的运移特征符合二项式渗流。试验中大颗粒粒径煤体和小颗粒粒径煤体,在流量达到极值后,通过煤体的气体流量随时间的衰减关系均成二项式关系。
利用自行研製的裝置,以氮氣模擬瓦斯,以同一壓力下壓實的不同粒徑煤樣製作不同煤體結構構造煤;氣源以恆定壓力嚮煤體持續註氣,使煤體吸附一段時間後,停止註氣,打開放氣閥,使煤體開始解吸,進行瞭煤體結構差異對氣體運移影響的試驗研究。結果錶明:構造煤體的氣體運移特徵有線性滲流和二項式滲流。噹組成構造煤體的煤顆粒粒徑較大時,在流量達極值前,通過煤體的氣體流量隨時間的變化成線性關繫,此時煤體內氣體的運移特徵符閤線性滲流。噹組成構造煤體的煤顆粒粒徑較小時,在流量達極值前,通過煤體的氣體流量隨時間的變化成二項式關繫,此時煤體內氣體的運移特徵符閤二項式滲流。試驗中大顆粒粒徑煤體和小顆粒粒徑煤體,在流量達到極值後,通過煤體的氣體流量隨時間的衰減關繫均成二項式關繫。
이용자행연제적장치,이담기모의와사,이동일압력하압실적불동립경매양제작불동매체결구구조매;기원이항정압력향매체지속주기,사매체흡부일단시간후,정지주기,타개방기벌,사매체개시해흡,진행료매체결구차이대기체운이영향적시험연구。결과표명:구조매체적기체운이특정유선성삼류화이항식삼류。당조성구조매체적매과립립경교대시,재류량체겁치전,통과매체적기체류량수시간적변화성선성관계,차시매체내기체적운이특정부합선성삼류。당조성구조매체적매과립립경교소시,재류량체겁치전,통과매체적기체류량수시간적변화성이항식관계,차시매체내기체적운이특정부합이항식삼류。시험중대과립립경매체화소과립립경매체,재류량체도겁치후,통과매체적기체류량수시간적쇠감관계균성이항식관계。
The methane gas in coal was simulated by Nitrogen , and the tectonic coal of different coal structure was simulated by coal sample with different granule-size under the same compaction stress .Gas was injected to each coal sample at a constant gas pressure to make each coal sample with sufficient adsorbed gas .Then, the gas outlet valve was opened to make each coal sample desorbed .The experiments about characteristics of gas migration in coal body with different structure were carried out with the self-made device .The results showed there are both linear seepage and binomial seepage in tectonic coal .When the tectonic coal is composed of large coal granule ,the law of gas flow through the coal sample changing over time meets linear relationship before the flow reaches the maximum value.In this condition,the characteristic of gas migration in tectonic coal can be described as linear seepage . When the tectonic coal is composed of small coal granule ,the law of gas flow through the coal sample changing over time meets binomial relationship before the flow reaches the maximum value .In this condition ,the characteristic of gas migration in coal sample can be described as binomial seepage .After the flow reaches the maximumvalue , the attenuation relations of gas flow through the coal sample changing over time meets binomial seepage in large coal granule sample and small coal granule sample .