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随着煤炭工业的飞速发展,用户对煤加工的要求越来越高,出售原煤已不能满足社会的需求,其经济效益也较差。目前,在我国还不能将原煤全部入洗的情况下,对煤进行筛分就显得很重要了,对于地方中、小型矿井则更为必要。 正确选择筛分方案对于提高经济效益、增强企业活力是非常重要的一环。所选方案的筛分粒度应根据煤质、粒度组成和用户要求,按现行《煤炭粒度分级》标准确定。 将煤分为几种粒度级别能获得最多的利、税,并使投资回收期不太长,则为筛分分级方案的最优设计。其程序如下: 首先计算第j个分级方案各产品煤的全年总产值W_j:
With the rapid development of the coal industry, users are increasingly demanding of coal processing. The sale of raw coal has failed to meet the needs of the society and its economic benefits are also poor. At present, in our country can not all raw coal into the case of washing, screening of coal is very important, for local, small mines is even more necessary. Correct choice of screening program for improving economic efficiency and enhance the vitality of enterprises is a very important part. The selected program of screening size should be based on the quality of coal, particle size and user requirements, according to the current “classification of coal particle size” standard. Coal is divided into several levels of granularity can get the most profits and taxes, and the investment recovery period is not too long, then the optimal design of the screening grading scheme. The program is as follows: First calculate the jth grade of the coal products of the annual output value of the program W_j: