JPS596701B2 - Method for producing fine powder material from slurry - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to producing fine powder materials from slurries.

When a coal-fired power plant is located far from a coal mine, hydraulic pipelines can economically transport the coal as a slurry from the mine to the power plant.

The invention arose from the study of an apparatus by which coal transported in the form of a slurry by pipeline could be burned in a thermal power plant. In this invention, the slurry is discharged into the heating zone through a conduit that is thermally isolated in the heating zone;
and a grinder (
A method is proposed for obtaining a fine powder material from a slurry by supplying the slurry to a micronization device.

Further, in the present invention, the plurality of grinding pole sets form an annular body with a plurality of series of balls, and are located between a fixed upper grinding race and a rotating lower grinding race. While rotating, each ball is sandwiched between the upper race and the lower race and moves through the grooves of the race to pulverize the coarse coal particles contained in the slurry, and the slurry is dried in the heating area containing the balls. A method is proposed for producing a pulverulent material from a slurry which is discharged from a discharge nozzle, which is the outlet of a thermally isolated conduit located in a heating zone, towards a grinding ball located in said ring. It is something.

In a variation of this method, the atomization may be done with rolls rotating on a grinding ring, and the rolls may rotate on an axis or between upper and lower races. The present invention also proposes a grinding mill device having a heating section.

A grinding device is provided within the grinding mill device and an inlet conduit is provided for supplying the material to be processed within the grinding device;
The conduit also extends from the slurry source to the heating zone, where the conduit is thermally isolated. In one embodiment of the present invention, an annular body 1 consisting of a set of a plurality of climbing poles 1a (hereinafter simply referred to as balls) is located between a fixed upper climbing race 2 and a rotating lower race 3.

The vertical portion 4a of the conduit 4 extends in the direction of the rotation axis of the annular body 1 of the climbing pole, and from its lower end, a branch conduit 4b forming one nozzle portion includes the center of the ball 1a. The end of the branch conduit 4 (nozzle part) is extended and positioned close to the inside of the annular body 1 of the ball within the plane 5, in other words close to the outer surface of the ball. The vertical portion 4a of the conduit 4 and the branch conduit 4b are thermally isolated, and the upper end of the vertical portion 4a is connected to a source of viscous coal slurry. When the device is in operation, the lower race 3 rotates in order to rotate the ball 1a.

The slurry is discharged from the conduit 4 towards the ball 1a and is pulverized as it passes around the outer surface of the ball.
These balls 1a sufficiently scoop out the slurry even when the coal/water ratio in the slurry is such that a thick paste is formed. The hot air enters from the outside of the ball 1a, passes between the balls of the annular body, changes direction and heads upwards of the above-mentioned device, and then goes around the vertical part 4a of the conduit 4 toward the outlet 6 where it is pulverized. It moves upwards, accompanied by coal. This pulverized coal entrained air is further heated by the heat generated by the operation of the crushing member of this device, and this pulverization process is continued until the drying of the slurry is achieved until a condition is established in which the pulverized coal entrained air can be directly supplied to the burner. It is accompanied by The area from which the slurry is discharged is heated and the conduits within the heated area are insulated to prevent the slurry from drying within the conduits and interfering with slurry flow. By using the above-mentioned equipment, coal can be transported directly from a coal mine in a remote area as a slurry to a thermal power plant, where it can be crushed, pulverized and dried to a final fine particle size suitable for combustion, and a dewatering device can be installed. In addition, the water vapor produced by slurry drying is supplied to the burner together with the heated primary air used for combustion, increasing the safety of preventing explosions when transporting pulverized coal. Furthermore, it lowers the combustion gas temperature and also acts as an inert gas, suppressing the generation of NOx (nitrogen oxides), allowing the slurry to be combusted.

The structure of the device according to the above embodiment is shown in the attached drawings.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of an apparatus used to carry out the invention. 1...An annular body consisting of a set of climbing poles, 1a...Clinding poles, 2.
...Fixed upper clinding lace, 3...
... Rotating lower race, 4... Conduit, 4a...
...Vertical part of the conduit, 4b... Branch pipe (nozzle part), 5... Plane containing the center of the ball, 6.
...Outlet, 7...Load cylinder, 8.
... Spider guide, 9 ... Throat plate, 10 ... Seal air connection part, 11 ...
...Electric motor, 12 ... (reduction) gear box, 1
3...Waste chute, 14...Labyrinth seal, 15...Return phosphorate for coal exceeding specified particle size, 16...Adjustment classification blade, 17.
...Insulation material, 18...Slurry pump.

Claims (1)

[Claims] 1. A method of pulverizing coal by placing an annular body, which is a set of a plurality of grinding balls arranged in a ring, between a fixed upper grinding race and a rotating lower race, in which coal slurry is pulverized from a remote delivery area. The conduit section that supplies the conduit in the equipment to be heated and is located in the heating area of this equipment has an insulated structure, and the end part of the conduit is used as the nozzle part, and its axis is located within the plane containing the center of the grinding ball. and the end of this nozzle part is located close to the surface of the grinding ball so that the slurry to be discharged can be wrapped around the surface of the grinding ball, and the slurry is transported, pulverized, and dried to supply pulverized coal directly from the delivery area to the burner. A method for producing a fine powder material from a slurry, characterized in that: