SU831188A1 - Method of controlling coal enrichment process - Google Patents

Description

(54) METHOD OF REGULATING THE PROCESS OF COAL ENDING

the yield of the concentrate is less than the inertial operation in proportion to the difference between the expected and actual dispersions, and the outputs of the concentrates of the remaining operations of the process are proportional to the ratio of the ash concentrations of coal concentrates of different size classes for the remaining operations.

The method is carried out as follows.

Information on the expected yields, ash content of enrichment products and their dispersions to obtain the maximum yield of a mixture of a given average ash content is determined in a computer, the algorithm of which is based on the equations of communication for the dependence of the ash content of the finished product on its output, calculating the dispersion of the ash content of the finished product, depending on the ash content of the concentrate, on its output by class. m.

The measured sieve and fractional composition of the coal charge are used to find polynomial coefficients that describe small neighborhoods of the yield and ash content of coal products, which are used to find such values of ash and output of enrichment products, so that the maximum yield of the finished product obtained from the mixture of concentrates is achieved while limiting x on their ash content.

The expected dispersion of the finished product's ash content is determined, and then the dependence of the ash content over time is determined by the first derivative of this dependency at the point preceding the forecast point and the actual dispersion of the finished product per control step.

The actual dispersion of the ash content of the finished product is compared with the expected one and, if the actual dispersion is greater than expected, the concentrate yield is less inertial, for example, the output of the concentrate of heavy media so that the dispersion of the finished product's ash is no more than expected.

The drawing shows the block diagram of the device that implements the proposed snoz.

The device contains technological areas. 1, 2 and 3, unit 4 for measuring sieve and friction compositions, extreme regulators 5, 6 and 7, ash sensors 8, 9 and 10, computational masking 11 and sensors for the amount of concentrate.

The device works as follows.

 The sieve and fractional composition of the coal 4 enters the computer AND, where the expected coal enrichment indicators are calculated, which make it possible to obtain the optimum yield of the enrichment products while limiting their ash content. The actual ash content and outputs of the enrichment products are measured by sensors 8-10 and 12- 14 and put them in memory

computer 11. For example, for the ash content of a concentrate, the deposition of such values per control step. 32.

Calculate the actual ash dispersion of the finished product and compare it with the expected one. The operation of technological sections 1-3 is regulated by extreme regulators 5-7, the settings of which are determined by the computer 11. In this case, two cases are possible. If the actual dispersion is greater than expected, then the average ash content of the finished product is supported by changing with an extreme regulator of concentrate yield to a less inertial process proportional to the difference of expected and actual dispersions of the finished product ash, and the outputs of the remaining processes are proportional to the proportion of their ash units in the mixture. If the actual ash dispersion is less than the specified one, then no calculation is performed and the control commands are not changed.

The application of the proposed method will allow increasing the concentrate yield at the coal preparation plant.

Claims (1)

Invention Formula The method of controlling the coal preparation process, based on the measurement of the actual average ash content of the finished product, composed of a mixture of concentrates of coal of different size classes by operations and total yield, by changing the yield of concentrates on individual operations  The coal preparation process, characterized in that, with C, the aim of improving the control accuracy, the sieve coal and the fractional composition of coal are measured, determined from the measured values of the sieve and fractional soy. The actual ash content of the finished product and the actual ash dispersion and concentrate yield above the calculated ones change the concentrate output less inertial operation in proportion to the difference between the expected and actual dispersions, and the outputs of the concentrates of the remaining operations of the process are proportional to the ratio of the ash content of concentrates of coal of different size classes for the remaining operations. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 323155, cl. B 03 D 8/40, 1971. 52. USSR author's certificate No. 223181, cl. In 03 C 1/14, 1971 (prototype).  ouzo / ib npoifecc / / jaccu uf a {uu / lpot t f mbf about m