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根据粉碎(作用)的矩阵理论(包括分级矩阵和破碎矩阵),本文提出了选煤厂辊式破碎机和选择性破碎机的数学模型。在辊式破碎机的模型中,分级矩阵用一个方程式来表示。破碎矩阵的导出,需先进行单颗粒煤样的摆锤破碎试验,然后用多维三次样条回归技术作计算机处理。选择性破碎机的整个过程由三个子过程组成:预先筛分,破碎和检查筛分。其中,预先和检查筛分的模型用一个简单的效率曲线公式来代表。破碎子过程的模型与辊式破碎机模型的概念类似,但需作进一步的假设:选择性破碎机的入料是纯煤和纯灰的混合物;这两种成分的分级函数相同;它们的破碎函数不同,且进入破碎子过程的选择率也不同;破碎和检查筛分两个子过程是多段反复进行的。经检验,上述两个模型可用朱比较准确地预测破碎产品的粒度分布。此外,本文还提出了一个预测破碎产品各粒级灰分的经验公式。
According to the matrix theory of crushing (including the classification matrix and crushing matrix), this paper presents the mathematical model of roller crusher and selective crusher of coal preparation plant. In roll crusher models, the classification matrix is represented by an equation. The derivation of the crushing matrix requires the pebble breaking test of the single particle coal sample first and then the computer processing using the cubic spline regression technique. Selective crusher the entire process consists of three sub-processes: pre-screening, crushing and screening screening. Among them, the pre-screening and screening model with a simple efficiency curve to represent. The model of the crushing process is similar to the concept of a roll crusher model, with the further assumption that the feed to the selective crusher is a mixture of pure coal and pure ash; the classification functions of these two components are the same; their fragmentation Function is different, and the selection rate into the broken sub-process is also different; broken and check the two sub-processes are repeated multi-stage. After testing, these two models can be used to more accurately predict the particle size distribution of broken products. In addition, this paper also presents an empirical formula for predicting the ash content of various fractions of crushed products.