Thickener automatic drug dosing system and method thereof

Abstract

The invention belongs to the technical field of coal preparation plant's slime water treatment link and mainly relates to an automatic addition system and a method of slime water treatment equipment thickener drugs. According to the thickener automatic drug dosing system and the method and mainly in the coal preparation plant's slime water treatment link, a PLC, a reasonable sensor and an execution mechanism and a feedforward+feedback control strategy based on case-based reasoning are adopted. dosage can be modified and optimized in advance through thickener feed concentration and flow signals monitored at real time, and thickener overflow and underflow concentration signals are utilized reasonably. System destabilization caused by feedback signal lag is avoided; problems, such as quality reduction of circulating water from a coal preparation plant, high drug consumption, high water consumption, etc., which are caused by inaccurate measurement of thickener overflow and underflow concentration during slime water treatment process in an existing coal preparation plant, poor reliability of a drug dosing execution mechanism, backward automatic control strategy, etc., are solved; and product quality and benefit of the coal preparation plant are enhanced.

Description

technical field [0001] The invention belongs to the technical field of coal slime water treatment in a coal preparation plant, and is mainly used for an automatic addition system and method of chemicals (coagulants and flocculants) in thickeners of coal slime water treatment equipment. Background technique [0002] For coal preparation plants using wet separation, slime water treatment is an important link, and thickener is a commonly used equipment for slime water treatment. In the slime water treatment process, most coal preparation plants accelerate the sedimentation of the slime in the thickener by adding chemicals to the slime water, so as to shorten the slime settling time, purify the overflow of the thickener, reduce the concentration of circulating water, and ensure The sustainable use of circulating water maintains the balance and normal operation of the water system of the entire coal preparation plant. The agents added in the slime water process mainly include co...

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Problems solved by technology

[0006] The system and method for automatically adding medicament to the concentrator of the present invention mainly adopts PLC, reasonable sensors, actuators and advanced control strategies in the coal slime water treatment link of the coal preparation plant, thereby solving the problem of coal slime water in the existing coal preparation plant. In the process of processing, inaccurate concentration measurement of the overflow and underflow of the thickener, poor reliability of the agent addition actuator, and backward automatic control strategy have caused problems such as the decline in the quality of circulating water in the coal preparation plant, and the large consumption of agents and water, thereby ensuring the quality of the coal preparation plant. The normal operation of the water system improves the product quality and efficiency of the coal preparation plant

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