SU4860A1 - Combined Mill for the preparation of coal dust - Google Patents

Description

In the proposed coal dust mill, two previously known types of mills are combined: one in which grinding is performed by a conical surface rotating inside a cylinder and the other in which a casing is used to heat the coal.

In FIG. 1 shows a vertical section of a mill along the line of the LED in FIG. 3, FIG. 2 is an external view and a partial section of the upper part of the shaft; FIG. 3 is a plan view, FIG. 4 is a section along the line AB in FIG. 3 and FIG. 5 is a vertical section of the mill element.

The proposed mill consists of a large number of individual mill elements 5-b (Fig. 1 and 4) enclosed in a common casing 1, 3, 4, having three chambers: the upper B, in which the shaft 8 is placed, with a worm thread for transmitting movement crusher m 5 - b, medium C, where the accumulation of moisture occurring in coal occurs at

its grinding, and the lower A, which serves as a collection of pulverized coal, coming from the crushers 5-b. The individual covers are bolted together and fastened to the body of the steam jacket 7.

Separate mill elements are arranged in two rows on both sides of the shaft 8, from which they receive movement using 10 teeth 9 mounted on their vertical axis, and consist of cylinders with internal grooved walls and rotating cones with a corrugated screw surface in them. In this way, the distance between the grinding surfaces gradually narrows and ends with a narrow gap that permits only coal dust. The lower part of the conical grinding surface 5 can be equipped with steel rings E, which, due to approaching cylindrical cartridges 6, rub the coal into fine dust before releasing it through the holes 25 into the collecting chamber. L (f. 1).

. For npju, qrp, eB.aJiti coal during pasMOJia, steam is used in the shirts 7 surrounding each individual 5-b crusher to remove moisture and gases produced in the space between the conical part 5 and the cylindrical 6. Moisture and gases from the grinding space enter chamber C and are removed from there by pipe into chamber 27, in which a fan 17 is placed, which sits on shaft 8 and leads them through pipe 28 to atmosphere.

The coal feeds the mill through the feed funnel 15, from where the coal enters the screw conveyor, in which there are openings for feeding coal into 5-b crushers along guide chutes. The conveyor receives movement from the shaft 8 rotated by the motor 13.

The subject of the patent.

1. Combined mill for the preparation of coal dust, consisting of two rows of vertical cylindrical crushers with conical grinding surfaces, characterized in that to remove moisture and gases that are obtained during grinding of coal heated by steam circulating in steam tubes 7 The mill is equipped above crushers 5-b (Figs. 1 and 4) with a chamber C (Fig. 1) connected to a chamber 27 equipped with a fan 17 for ejecting these gases into the atmosphere.

2. The shape of the combination mill according to claim 1, characterized in that the lower part of the rotating grinding surfaces 5 (Fig. 5) is provided with steel rings EE, which are drawn closer to the chuck 6 to grind the coal before discharging it through the hole 25.

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