SU977041A1 - Coal concentrating process control method - Google Patents

Description

(54) METHOD OF MANAGING THE COAL ENRICHMENT PROCESS

one

The invention relates to the field of process control with the help of computers and can find application in the coal, mining, metallurgical and other industries.

There is a known method of controlling the process of coal enrichment by changing the yields of the concentrates of the compartments based on the current values of the yield and ash content of the concentrates 1.

There is a known method of controlling the process of coal enrichment, based on measuring the amount of light fractions in waste, the yield and ash content of the concentrate through the operations of the enrichment process and maintaining the maximum yield of the finished product of a given average ash content of the process by changing the output of the separate process 2 to separate operations 2.

A disadvantage of the known methods is low control accuracy, which does not allow for a significant increase in the yield of the finished product of a given average ash content by introducing what is not taken into account a number of coal characteristics as an enriched object.

for example, the content of heavy fractions in the concentrate, the content of large and sludge classes in the row containing sulfur in the light fractions, i.e. management in this method is based on one of the main characteristics - the content of light fractions in the waste - while the other characteristics have a significant impact on the change in the qualitative and quantitative indicators of the finished

10 products, not taken into account.

The purpose of the invention is to improve the accuracy of control.

The goal is achieved by the fact that in the process of controlling the enrichment process

fS coal based on measuring the amount of light fractions in the waste, the yield and ash content of the concentrate according to the operations of the enrichment process and maintaining the maximum yield of the finished product of a given average

Claims (2)

20 process ash by changing the concentrate yield on individual operations, measure the content of heavy fractions and sulfur in the concentrate by operation and process as a whole, determine the state of operations and process as the square root of the sum of squares of actual characteristics deviations from determine the ratios of the found state values by operations to the measured values of the process as a whole and adjust the concentrate output for operations with the maximum ratio proportional to this ratio, and the concentrate outputs in the remaining operations, inversely proportional to the ratios of the measured values of the operations. The drawing shows a block diagram of an apparatus for carrying out the method. Positions 1-3 designate coal processing operations. In addition, the scheme includes a sampler 4, a unit 5 for systematically measuring coal characteristics, a computing machine 6, concentrate amount sensors 7–9, concentrate ash sensors 10–12, extreme regulators 13–15, 16–18 waste quantities. The sampler 4 takes samples of raw coal and goes to unit 5 for systematically measuring the characteristics of the coal. The raw coal is subjected to classification and then enriched according to the process operations (1-3). After enrichment, concentrate and waste are obtained, while sensors 7–9 measure the amount, and sensors 10–12 concentrate ash. Sensors 16-18 measure waste by process steps. All measured values are stored in memory of the sending machine 6.. The implementation of this goal takes place in a computer according to an algorithm, the essence of which consists in minimizing the length of the vector of deviations of the normalized characteristics of the current mode of operation from the optimal (for a given) i. Thus, the process control process operations must be carried out in such a way that the minimal vector - (0 Od sr expression (1). Denote by points of n-dimensional space the given. Current R ri; r / 2; .., Гy modes of operation of the enrichment process. Connect the points RO and K, then the length of the vector is / RRo г de pj-XjO- j / r /); JM, Kj are weighting factors, r ° MJr-l are, respectively, the characteristics of a given and current 9 9 14 For a coal preparation plant, the scope for determining the real mode of its operation is limited, but the number of various modes is sufficiently large, this does not allow for all modes to be foreseen . calculate the indicators of any mode and store them in the memory of the computer. All this leads to the fact that all of the many operating modes are calculated from the most feasible in this production situation. In determining the mode, the rule of all possible modes is chosen by choosing one whose vector length / RRo / is minimal compared to the remaining ones. First of all, the problem of finding the optimal indicators of coal enrichment according to the output parameters of individual enrichment operations is solved. Its statement is as follows: it is required to find the maximum of the function with the restriction on the ash content of the finished product of max. A + VK. A + TC. A: A A, (2) CK, .F. pc 1 :: pkr; ex.ffi tkgCtk, p; -, 6K .1; l-1) / - gao; , (-V (, U, AC,. / -, O .. aj (j, aij, aj2 - coefficients of polynomials; Ti ajo + ai, Aj + aj2 - load on raw coal per section, t / h; y, - - concentrate output from the process operation,%: I - coefficient that accounts for the change in price of 1 ton of concentrate depending on its ash content, and - concentrate price, RUR / t; A - specified ash content,%; There are points for different values of specified ash content the current ash content in which the maximum F-criteria (2) is reached. Moreover, their analysis shows that, starting from a certain moment, the value of the current flow rate is This becomes insensitive to changes in a given ash content, although the max Φ value at the last step of increasing the specified ash content is greater than max Φ at the previous step.This feature allows determining the expedient value of the specified ash content and the task of finding the optimal indicators of the enrichment process in two stages. At the first stage, the search for optimal indicators is carried out on individual operations. In the second, there are such controllable effects on the processes, the ash content of the total concentrate was equal to the specified one. / .. The essence of the algorithm for searching for optimal indicators of the enrichment process is as follows. The selection of common characteristics of all operations of the process} I} (such characteristics, in particular, may be: the content of heavy fractions in concentrate, the sulfur content in light fractions; the content of light fractions in waste; the ash content of operations concentrate; the input load of operations and others). The base (predetermined) values of the characteristic R ° are determined. The normalized deviation is found, p; kj (l-rj / ri), where kj is the scale factor, j is the characteristics. The length of the vector of deviations of the characteristics of the i-th operation of the enrichment process from the base V- is determined. (The optimum values of the ash content and the concentrate yield of individual operations of the process 1CFrSC.P.P.L. + LC, the value of Aj is calculated. -criteria The current characteristics of the enrichment and waste products are determined 16. The ratios of the lengths of the vectors of individual operations to the length of the vector of the whole process are found. The current characteristics are compared with the set ones. If at least one of the characteristics does not match the set, then it finds operation with a maximum ratio. Concentrate output, operations with maximum ratio Fj / F proportional to this ratio, and output of concentrates of other operations - inversely proportional to the values found. Using the proposed invention will increase the yield of the finished product with specified ash, sulfur and heavy contents fractions in concentrate. Formula of the invention. A method for controlling the coal preparation process based on measuring the amount of light fractions in the waste, the yield and the ash content of the end losses on the operations of the enrichment process and maintaining the maximum yield of the finished product of a given average ash content in the process by changing the concentrate yield on individual operations; characterized in that, in order to increase the control accuracy, the content of heavy fractions and sulfur in the concentrate is measured by operations and the process as a whole, the state of the operations and the process is determined as the square root of the sum of squares of the deviations of the actual characteristics from the specified, found values by operations to measured values for the process as a whole, and adjust the output of the co-concentrate to operations with a maximum ratio proportional to this ratio, and the outputs of concentrates for other operations are inversely proportional to the ratio of measured values to operations. Sources of information taken into account in the examination 1. USSR author's certificate for application number 2572765/03, cl. B 03 D 1/00, 1978. 2. USSR author's certificate number 716597, cl. B 03 B 13/00, 1980 (prototype). ffj7acct cf / fatft // f E D / fffrryoffbl tfof / tift fnpam Shit} foffbi waste