龙华选煤厂降低洗末煤水分的方案探索

A study of the schemes for reducing the moisture of clean small coal at Longhua Coal Washery

龙华选煤厂的洗末煤由20~13 mm粒级浅槽末精煤、13~1.5 mm粒级重介末精煤、1.5~0.35 mm粒级螺旋粗精煤三部分组成,原煤分级脱泥筛选型偏小、离心脱水机入料量大分别是这三者水分高的原因。针对此问题,需要增设1 500 mm的卧式振动卸料离心脱水机3台、立式刮刀卸料离心脱水机1台,以提高各脱水系统的处理能力。预计采取降水措施后,浅槽末精煤水分为14.50%,重介末精煤水分为15.00%,螺旋粗精煤水分为20.00%,洗末煤产量可以达到3.59 Mt/a,综合水分为15.64%,发热量为24.16 MJ/kg,洗末煤的数质量均会有所提高。

The washed small coal product of Longhua Coal Washery is made up of 3 parts： the 20 -13 mm small coal from tromp separator （dense medium shallow-bath separator） ; the 13 - 1.5 mm small coal prod- uct of H. M. cyclone; and the 1.5 -0 mm fine coal product of spiral separator. The 3 component parts are all high in moisture for the reasons that the raw coal sizing-disliming screen selected for use is relatively low in capacity and the centrifuge works under an excessive load. To avert this situation, it is necessitated to add three Ф1 500ram horizontal vocational discharge centrifuges and a vertical scraper discharge centrifuge for increasing the capacity of the dewatering system. It is predicted that through the adoption of the mois- ture reduction measures, the moistures of the abovementioned 3 component parts may be reduced to 14.50%, 15.00% and 20. 00% respectively, and the output of the composite clean coal product with a combined moisture of 15.64% and a calorific valve of 24. 16 MJ/kg may reach 3.59 Mt/a.