【摘要】：利用Falcon離心分選機(jī)可以實(shí)現(xiàn)對細(xì)粒煤進(jìn)行低成本、無污染的高效脫硫降灰,但是-0.045mm粒級高灰細(xì)泥容易越過溢流堰進(jìn)入精煤,造成精煤污染,影響分選效果。本文采用KREBS分級旋流器對細(xì)粒煤進(jìn)行超細(xì)分級,并對分級旋流器底流產(chǎn)品進(jìn)行強(qiáng)化重力場分選試驗(yàn)。利用軟件進(jìn)行試驗(yàn)方案優(yōu)化最終得到在入料壓力為0.03MPa,補(bǔ)加水壓0.02MPa,入料濃度為12.50%的操作參數(shù)下,最終可以得到91.32%的分級效率。適當(dāng)?shù)脑黾尤肓蠅毫Σ粌H可以降低底流中細(xì)粒級的含量,同時(shí)可以減少溢流中的跑粗;在入料壓力增大到一定程度之前(本次試驗(yàn)研究入料壓力界限為0.04MPa),隨著入料壓力的增加,分級粒度減小,分級效率以及分級精度升高,超過0.04MPa之后,干擾沉降作用加劇,分級效率及分級精度下降。相較與無沖洗水,有沖洗水的條件下可以有效降低底流中細(xì)粒級含量,但是沖洗水的添加也會(huì)造成臨近粒級在溢流中跑粗,并且分級粒度隨著沖洗壓力的增加而增大;過高的入料濃度會(huì)使顆粒因底流濃度過高,造成干擾沉降作用加大,分級粒度增大,分級效率降低;通過試驗(yàn)優(yōu)化以及驗(yàn)證最終得到旋流器超細(xì)分級試驗(yàn)優(yōu)化參數(shù)組合為:入料壓力0.03MPa,沖洗水壓力0.02MPa,入料濃度12.50%,此時(shí)分級效率為91.32%,并且得到分級效率與操作參數(shù)之間的函數(shù)關(guān)系;在精煤灰分要求不高于8%的條件下,Falcon離心分選最終的優(yōu)化操作參數(shù)組合為:轉(zhuǎn)動(dòng)頻率19.02HZ,反沖水壓0.02MPa,入料濃度15%。
[Abstract]:Falcon centrifugal separator can realize low cost and no pollution high efficiency desulphurization and ash reduction of fine coal, but-0.045mm high ash fine mud is easy to cross overflow Weir into clean coal, resulting in clean coal pollution and affecting the separation effect. In this paper, KREBS classification cyclone is used to classify fine coal, and the gravity field separation test is carried out on the bottom flow products of the classification cyclone. When the feeding pressure is 0.03 MPA, the water pressure is 0.02 MPA and the feeding concentration is 12.50%, the classification efficiency can be obtained by using the software to optimize the test scheme. Properly increasing the feeding pressure can not only reduce the content of fine particles in the bottom flow, but also reduce the running diameter in the overflow. Before the feeding pressure increases to a certain extent (the feeding pressure limit is 0.04MPa), with the increase of the feeding pressure, the classification particle size decreases, the classification efficiency and classification accuracy increase, after exceeding 0.04MPa, the interference settlement is intensified, and the classification efficiency and classification accuracy decrease. Compared with the non-flushing water, the fine particle size content in the bottom flow can be effectively reduced under the condition of flushing water, but the addition of flushing water will also cause the adjacent grain size to run thicker in the overflow, and the grading particle size will increase with the increase of flushing pressure, too high feed concentration will cause the particles to interfere with and settle, the classification particle size will increase, and the classification efficiency will decrease. Through experimental optimization and verification, the optimal parameter combination of ultra-fine classification test of cyclone is obtained as follows: feeding pressure 0.03 MPA, flushing water pressure 0.02 MPA, feed concentration 12.50%, classification efficiency 91.32%, and the functional relationship between classification efficiency and operation parameters is obtained. Under the condition that the ash content of clean coal is not more than 8%, the final optimal operation parameter combination of Falcon centrifugal separation is as follows: rotation frequency 19.02HZ, recoil water pressure 0.02MPA, feed concentration 15%.
【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;TD922

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