ABOUT DEVELOPMENT OF ADAPTIVE CONTROL SYSTEM OF IRON ORE CONCENTRATE FILTRATION PROCESS

Abstract: The research is devoted to the development of adaptive   automatic control system of filtration process. processing capacity, quality and cost of the output product of the process depend on the course of this process. Equipments efficiency, quality and cost price of the output product of the process depend on the course of this process.

Currently, disk vacuum filters are used to filter iron ore concentrate. These filters are in most cases  operated by personnel  manually based on the results of laboratory analyses conducted with low frequency and high delay. At the same time, to avoid exceeding the maximum permissible moisture content of sediment, the operator supports it with a certain margin, deliberately reducing the average value of discs rotational frequency. This leads to a decrease vacuum filter efficiency. As a result, taking into account the high costs at energy resources used in the filtration process, the cost price of the concentrate increases and its quality decreases.

The main objective of this study is to increase the disk vacuum filters efficiency. Herewith, the output product moisture must be maintained at the level required by the technology. At the same time, the increase of efficiency should lead to a decrease of specific energy consumption for the filtration process, and the stabilization of moisture should lead to an increase of dehydrated concentrate quality (stability of characteristics).

The ultimate goal of the current research is the development adaptive system control of iron ore concentrate filtration process based on a multiparameter extrem-fuzzy controller. During the study, it was found that  at inputs of this regulator should be fed the total specific resistance of sediment and the filter cloth (integral index determined by concentrate granulometric composition and degree of filter cloth contamination) as well as the degree of approximation to extremum (maximum) of filter efficiency.

It was found that the first input parameter of regulator can be indirectly estimated on the rate module average value of valve position change installed on the vacuum pipe. The average value of this parameter is calculated during of transition process after changing task in control loops of supply pulp density of filter or vacuum in sediment set zone. The second input parameter of the regulator can be indirectly estimated by the difference of present specific efficiency and specific efficiency at the previous step of the extreme regulator work.

disk vacuum filter, iron ore concentrate, filtration, extrem-fuzzy regulator, sediment moisture, indirect estimate, vacuum, total specific resistance

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