A Coal Preparation Plant Supplementary Clean Water Control System

Abstract

The invention discloses a clear water refilling control system for a coal preparation plant. The system comprises a clear water tank and a clarified water tank which are adjacent to each other, a water refilling pipe and a valve C are arranged above the clear water tank, two feeding pipes for a sweeping water pump are separately connected to the bottoms of the clear water tank and the clarified water tank, a valve A and a valve B are separately arranged on the two feeding pipes, one pipe of the clarified water tank is directly connected to a production water pump, and a valve D is arranged on the pipe; liquid level signals of liquid level sensors of the clear water tank and the clarified water tank are transmitted to an analog input module, output signals of a digital output module are transmitted to the valves A, B, C and D, the analog input module and the digital output module are separately electrically connected with a master control module, and the master control module compares the set liquid levels with the practical liquid levels of the clear water tank and the clarified water tank respectively to control the valve C. The system can prevent cleaning failure due to high concentration of clarified water and avoid using circulating water to corrode plants and equipment.

Description

technical field [0001] The invention relates to the quality and use of production water in a coal preparation plant, in particular to a control system for adding clean water to a coal preparation plant. Background technique [0002] The process flow of the closed-circuit cycle of washing water in the coal preparation plant is: the washing water in the coal washing process needs to be recycled, and all the slime water needs to be treated in the thickening tank, and the upper clear liquid of the thickening tank reaches the clarification tank for recycling. Since there will be a small amount of water loss during the washing process, clean water needs to be added to the circulating pool, and the water in the circulating pool is used as system production and plant flushing water. [0003] At present, the vast majority of coal preparation plants directly add a fresh water pipeline to fill the clear water directly into the clarification pool, and then use the production water pump ...

AI Technical Summary

Problems solved by technology

Although this design can meet the basic production needs, it has the following two main disadvantages: 1. When the original coal slime is serious or other reasons cause the overflow water of the thickening tank to be unclear, the circulating water cannot meet the cleaning needs; A large amount of chemicals are added during the treatment process in the concentration tank, which will cause corrosion to the steel structure and equipment during the flushing of the plant

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