Double-in and double-out steel ball coal mill shaft diameter combined separator

Abstract

The invention relates to a double-in and double-out steel ball coal mill shaft diameter combined separator which is free of blocking, good in separability and adjustable in coal powder fineness. The separator comprises a feeding air pipe, an outer cylinder body, an inner cylinder body, a powder return cylinder and discharging pipes, wherein the inner cylinder body is mounted in the outer cylinder body; a ring-shaped passage is reserved between the inner cylinder body and the outer cylinder body; a plurality of rotatable flow guiding separating plates are arranged in the ring-shaped passage in the radial direction of a separating cylinder, and are distributed at the lower part of the side wall of the inner cylinder body; the flow guiding separating plates rotate to form a certain opening degree to realize that coal powder airflow entering the ring-shaped passage is guided to be whirlwind coal powder airflow; a plurality of guiding plates are also arranged in the ring-shaped passage in the radial direction of the separating cylinder, are distributed at the upper part of the side wall of the inner cylinder body, and are connected with externally arranged driving devices; the driving devices drive to adjust the opening degree of the guiding plates so as to enable the whirlwind coal powder airflow to flow out of the discharging pipes.

Description

technical field [0001] The invention relates to a separator, in particular to a double-inlet and double-outlet steel ball coal mill shaft-diameter combined separator. Background technique [0002] At present, the pulverized coal preparation system of domestic thermal power plants mainly uses a double-inlet and double-outlet steel ball coal mill as the main equipment. The separator of the traditional double-inlet and double-outlet steel ball coal mill is a radial separator, such as figure 1 As shown, the radial separator includes a feed air duct 1, an inner cone 2 and an outer cone 3, and the inner cone 2 and the outer cone 3 are fixed by a plurality of round steel phases. During work, the coal The pulverized air flow is from the feed duct 1 to the upper part of the separator through the annular channel between the inner cone 2 and the outer cone 3, and the pulverized coal flow is turned 90° by the radial baffle plate 4 set on the inlet of the inner cone 2 Finally, it enters...

AI Technical Summary

Problems solved by technology

However, in the actual working process, there are often frequent accumulations of sundries at the radial baffle plate so as to cause blockage, so that the pulverized coal airflow cannot flow into the inner cone 2 for centrifugal separation, and the inner cone air-locking plate 6 is jammed by sundries and separated. The performance effect is poor, the fineness of coal powder exceeds the standard, and the uniformity of coal powder is poor, resulting in the common problem of high carbon content in boiler slag and fly ash

[0003] A 2x660MW unit boiler in the third phase of a power plant is equipped with 10 MGS4060B double-inlet and double-outlet steel ball coal mills, and there is no spare coal mill designed. For automobile coal, the above coal types have low calorific value, low volatile matter, and poor grindability. The unit is fully loaded, and each coal mill can only run at excess capacity. The maximum output can reach 70 tons, and the coal fineness can reach 30% (R90 ), the uniformity index of pulverized coal is between 0.5-0.7, the boiler slag is more than 20%, and the carbon content of fly ash is about 7%. Increased wear (especially steel ball grinding), increased maintenance

That is to say, during the tight supply of coal for power generation, the coal grinding pressure of the coal mill is high, and the coal grinding effect is poor, resulting in low efficiency of the whole pulverized coal preparation system

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