本文選題：煤巖顯微組分 + Falcon離心分選��； 參考：《中國礦業(yè)大學(xué)》2017年碩士論文

【摘要】：煤巖顯微組分是煤的微觀組分,實現(xiàn)煤巖顯微組分富集可以有效提高煤制油轉(zhuǎn)化效率,提高配煤煉焦效率,有助于制作優(yōu)秀水煤漿。本文是采用Falcon離心分選機探究強化重力場中煤巖顯微組分富集的最佳效果。試驗煤樣的灰分為9.57%,揮發(fā)分為37.40%,為長焰煤。煤中鏡質(zhì)組含量為48.64%,惰質(zhì)組為44.07%,殼質(zhì)組為0.86%,礦物質(zhì)為6.43%。首先要研究強化重力場下煤巖顯微組分的最佳解離粒度。將試驗煤樣解離到不同粒度,通過對煤樣做篩分試驗、浮沉試驗以及Falcon分選試驗,發(fā)現(xiàn)當(dāng)解離粒度為-0.25mm時,試驗煤樣的灰分、鏡質(zhì)組含量、鏡質(zhì)組回收率和惰質(zhì)組脫除率的效果均最好,確定了強化重力場中煤巖顯微組分富集的最佳解離粒度為-0.25mm。將試驗煤樣解離到0.25mm以下,對強化重力場中分離煤巖顯微組分最佳工藝參數(shù)進行研究。通過轉(zhuǎn)動頻率和反沖水壓的單因素探索試驗,得到了各單因素較好的取值區(qū)間,確定了Falcon正交試驗的因素水平。采用Design-Expert軟件對Falcon正交試驗進行設(shè)計和分析,對可燃體回收率、脫灰率、鏡質(zhì)組回收率和惰質(zhì)組脫除率均使用二次方模型進行數(shù)據(jù)分析,分析結(jié)果顯示反沖水壓對各項指標的影響均要大于轉(zhuǎn)動頻率對各項指標的影響。對正交試驗進行優(yōu)化,優(yōu)化目標優(yōu)先級為脫灰率=惰質(zhì)組脫除率可燃體回收率=鏡質(zhì)組回收率,對可燃體回收率和鏡質(zhì)組回收率的最大值進行限制。對灰分取最小值,對其他五個評價指標均取最大值,得到的優(yōu)化結(jié)果為轉(zhuǎn)動頻率55Hz、反沖水壓0.03MPa,此時各項指標結(jié)果分別為:灰分4.69%、鏡質(zhì)組含量67.50%、可燃體回收率34.09%、脫灰率82.96%、鏡質(zhì)組回收率40.80%、惰質(zhì)組脫除率76.62%。此時,在保證鏡質(zhì)組富集物中鏡質(zhì)組含量的情況下依然可以保證鏡質(zhì)組富集物的產(chǎn)率。
[Abstract]:Coal and rock macerals are microscopic components of coal. The enrichment of coal and rock macerals can effectively improve the conversion efficiency of coal to oil and the coking efficiency of coal blending, which is helpful to the making of excellent coal water slurry. In this paper, Falcon centrifugal separator is used to explore the best effect of enhancing the enrichment of coal and rock macerals in gravity field. The ash of the test coal sample is 9.57 and the volatile content is 37.40%, which is long flame coal. The content of vitrinite in coal is 48.64%, in inertinite is 44.07, in chitin is 0.86, and in mineral content is 6.43. First, the optimum dissociation granularity of coal and rock macerals under enhanced gravity field should be studied. The test coal sample was dissociated to different granularity. Through sieving test, floatation test and Falcon sorting test, it was found that the ash content and vitrinite content of coal sample were tested when the dissociation granularity was -0.25mm. The vitrinite recovery rate and the inertinite removal rate are the best. The optimum separation granularity of the enrichment of coal and rock macerals in the enhanced gravity field is -0.25mm. The experimental coal samples were dissociated below 0.25mm to study the optimum technological parameters for separation of coal and rock macerals in the enhanced gravity field. Through the single factor exploration test of rotation frequency and recoil water pressure, the better value interval of each single factor was obtained, and the factor level of Falcon orthogonal test was determined. The orthogonal test of Falcon was designed and analyzed by Design-Expert software. The recovery rate of combustible body, ash removal rate, vitrinite recovery rate and inert group removal rate were all analyzed by quadratic model. The results show that the impact of recoil pressure on each index is greater than that of rotation frequency. The optimization of orthogonal experiment shows that the priority of the optimization is removal rate of ash = removal rate of inertinite group. The maximum recoveries of combustible body and vitrinite group are limited to the combustible body recovery rate and vitrinite group recovery rate. The minimum value of ash content and the maximum value of the other five evaluation indexes, The optimized results are as follows: rotation frequency 55 Hz, recoil water pressure 0.03 MPA. The results are as follows: ash 4.69, vitrinite 67.50, combustible body recovery 34.09, ash removal 82.96, vitrinite 40.80 and inertinite 76.62. At this time, the vitrinite concentration in vitrinite can still ensure the yield of vitrinite enrichment.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD94

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本文編號：1923502