Negative pressure type ball mill coal grinding and powdering powder grinding system

Abstract

The invention discloses a negative pressure type ball mill coal grinding and powdering powder grinding system. The negative pressure type ball mill coal grinding and powdering powder grinding system comprises a ball mill, a powder selecting machine, a bag type dust collector and a centrifugal draught fan; the ball mill is used for grinding raw coal materials; the ball mill is provided with an airinlet and an air outlet; the powder selecting machine screens ground coal powder; fine coal powder conforming to fineness is fed to the bag type dust collector; rough coal powder without conforming tofineness is fed back to the ball mill; the powder selecting machine is provided with an air sucking pipeline which is connected with the air outlet of the ball mill; the bag type dust collector is used for collecting fine powder fed in from the powder selecting machine; an air inlet of the centrifugal draught fan is connected with an air outlet of the bag type dust collector; and the ball mill, the power selecting machine and the dust collector are connected in series and form a closed negative pressure sucking system under the air draft effect of the centrifugal draught fan from inside to outside. Compared with the prior art, the negative pressure type ball mill coal grinding and powdering powder grinding system does not diffuse dust to the outside, it is avoided that dust-containing airflow runs to the outside, and using is more environment-friendly.

Description

technical field [0001] The invention relates to the technical field of pulverized coal grinding, in particular to a negative pressure ball mill for grinding coal into powder and grinding system. Background technique [0002] The existing coal grinding system with ball mill as the main machine all uses ball mill as the main grinding equipment, equipped with conveying and feeding equipment, hoist, powder separator, screw conveyor, pulse bag filter, centrifugal fan etc. to form a coal grinding and pulverizing system to implement coal grinding and pulverizing. The main disadvantage of this coal grinding and pulverizing system is that the hoist is used as the main material lifting equipment to lift the pulverized coal particles after pulverization to the classifier for particle fineness separation. The main working principle of the hoist is to rely on the vertically moving chain hopper to lift the pulverized coal particles to a certain height. The main disadvantage of using the ...

AI Technical Summary

Problems solved by technology

The main disadvantage of this kind of coal pulverization system is that the hoist is used as the main material lifting equipment to lift the pulverized coal particles to the classifier for particle fineness separation.

The main working principle of the hoist is to rely on the vertically moving chain hopper to lift the pulverized coal particles to a certain height. The main disadvantage of using the hoist as a hoisting device is the consumption of electric energy and the generation of a large amount of dust

The characteristic of this system is that the ball mill and other auxiliary equipment form a semi-closed loop production process in the form of semi-serial connection without external fresh air supply. When grinding materials containing a certain amount of moisture, the system operates with the equipment The temperature of the internal dust-laden airflow continues to rise, and the moisture in the material turns into water vapor. The volume will increase with the increase of temperature, and it cannot be discharged in time, resulting in positive pressure in the system, and the dust-laden airflow is more outward. Point and scattered run off, causing environmental pollution

Moreover, when the water content of the material exceeds a certain amount, it will have a great adverse effect on the grinding efficiency, the power consumption of the mill and the production efficiency.

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