矿用防爆型煤灰分仪的研究与设计
Research and Design on Mine Flame Proof Coal Ash Analyzer
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摘要: 为了提高采出率、控制含矸率,需要在煤矿井下用矿用防爆型煤灰分仪对采区原煤灰分进行在线监测。根据煤灰分仪用241Am低能γ射线在穿过3 mm钢板后衰减94.1%的现状,提出了射线透窗技术。通过研究各种材料,多次试验比对,找到了符合防爆性能要求的透窗材料,使低能γ射线在穿过隔爆壳时的衰减率降低至40.6%;选择双源分置、双γ探测仪技术消除了137Cs的康普顿效应对241Am的计数干扰,同时解决了Cs、Am计数范围不兼顾的矛盾。采用该技术设计的矿用防爆型煤灰分仪已在铁煤、焦作、兖矿等煤矿集团使用,现场测试表明,其精度满足了用户需求。Abstract: In order to improve the mining rate and control the coal rejects rate, a mine flame proof coal ash analyzer was required to on-line monitor and measure t he ash content of the raw coal from the mining face According to the status of the 24 1Am low power y rays applied for the ash analyzer would be reduced by 94.1% afte r the rays penetrated through a 3 mm steel plate, a ray penetrated window technology was provided.With a study on different materials and the several experiments and comparisons, a penetrated window material with the flame proof performance requirements was found and the reduction rate of the low power γ ray could be reduced to 40.6% after penetrated through the explosion proof shell.With the selection of the double sources divided device, the double y rays detector technology could eliminate the 137Cs Compton effect affected to 24 1Am counting number and could solve the non-consideration contradiction in the scope of the Cs and Am counting numbers.Th e mine coal ash analyzer designed with the double γ rays technology was applied to the Tiefa, Jiaozuo, Yanzhou and other coal mining group.The site measurements a nd tests showed that the accuracy could meet the requirements of the custmers.
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Keywords:
- mining rate /
- mine flame proof /
- coal ash analyzer /
- ray penetrated window /
- low power y ray
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