Determination of Optimum Operating Conditions for Washing Mixed Coals by Using Spreadsheet Optimization Method
In composite washeries optimization of operating parameters to achieve maximum clean coal yield at the desired clean coal ash level is a major problem. This problem is more acute in countries like India, which have predominant reserves of diffficult-to-wash coals. The constrained operational parameters of washing for some equipments make it more severe. In addition to this, the dependence of separating performance of different equipments upon various variables aggravates the situation.Here an attempt is made to find a numerical solution to get maximum yield and minimize the difference between the actual and the theoretical yield. The solution is arrived through constrained non-linear optimization of a multivariable objective function that utilizes spreadsheet tools; the method accommodates any number of source coals or washing size fractions. By using a designed Ep value the predicted yield of composite clean coal has been calculated and the yield is optimized subject to constraints on both the ash and specific gravity. It is shown that operational constraints of different washeries in the composite plant that utilizes gravity separation methods can also be overcome. The technique offers the coal preparation engineer an effective and straightforward method for determining the optimum cut-points of separation for different coals or blended coals to obtain maximum product yield at a specified level of ash content.
Coal cleaning Probable error Spreadsheet tool Sharpness factor Lagrangian multiplier
S. Mohanta B. K. Mishra S.K. Biswal
Indira Gandhi Institute of Technology, Dhenkanal, India Institute of Minerals and Materials Technology, Bhubaneswar, India
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
2042-2054
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）