Classification device, standing pulverizer using the classification device, and coal burning boiler apparatus

Abstract

[Problem] To provide a classification device in which product fine powder little in mixture ratio of coarse particles can be obtained. [Means for Resolution] A classification device characterized in that a setting pitch P between stationary fins 13 and a width L of each stationary fin 13 are combined so that a value of P / L is in a range between 0.042×(¸-50)+0.64 and 0.019×(¸-50)+0.22 in 50°‰¤6‰¤70° when ¸ is an inclination angle of each stationary fin 13, P is the setting pitch, and L is the width in a direction of circulation of particles.

Description

technical field The invention relates to a classifying device for separating particles in a gas-solid two-phase flow into coarse particles and fine particles, in particular to a classifying device suitable for being assembled on a vertical pulverizing device of a coal-burning boiler device and the like. Background technique In a coal-fired boiler plant for thermal power generation that burns pulverized coal as fuel, a vertical roller mill is used as a fuel supply device. Fig. 27 shows a conventional example thereof. This vertical roller pulverizer includes: a pulverizing part 5 for pulverizing coal as a raw material of pulverized coal by the bite of pulverizing table 2 and pulverizing roller 3; Classification section 6 of arbitrary particle size. The operation of this vertical roller mill will be described as follows. After the coal supplied from the coal supply pipe (raw material supply pipe) 1, that is, the object to be pulverized 50 falls to the center of the rotating...

AI Technical Summary

Problems solved by technology

Therefore, fine powder is bitten into the press roller, which causes the self-excited vibration of the roller, and the amount of coal held in the pulverizing part of the pulverizer increases, resulting in a reduction in the pulverization amount and an increase in the pulverization power.

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