SU25231A1 - A device for grinding and drying of fuel - Google Patents

Description

The invention relates to a device for grinding and drying fuel by passing it along with hot gases via pipelines and mills.

The intensity of drying depends on many facts, including the size of fuel grains. Small particles of fuel that have a large surface relative to their weight are dried very intensively, while large grains of fuel are dried over the same period of time much weaker.

In the proposed device, the fuel from the coarse grinding mill is entrained in a stream of hot gases into a vertical pipe, where it is dried and enters the main box, from where larger fuel particles released from the stream go through the bunker and the fine grinding mill to the stream of hot gases of the second pipe, where finally, it dries and enters the common box again, from where it is withdrawn into the cyclone, where the fuel is released and the gases are sucked out by the exhauster.

For large installations, instead of two pipes, three or more pipes are installed, of which each passes subsequent large particles of fuel through the bunker and mill.

In FIG. i depicts a diagram of a device for grinding and drying fuel with two parallel streams of hot gases; FIG. 2 - the same device with three streams of gases.

In the proposed device for grinding and drying the fuel, the hot gases (or air) supplied through channel 1 are divided into two parallel streams. The main stream of gases is sucked through pipe 3 (Fig. 1) and carries along the raw material of the coarse mill 2 fed. Coarse gases, together with the raw fuel, rise through the vertical pipe 3, in which the fuel is dried by cooling the gases . Oh yeah pipe 3 gas mixture with fuel enters the common box 4, in which; large particles of fuel fall out of the gas stream, and small, together with the cooled gases, are sucked off by the pipe 10. The large particles of fuel that fall into the box 4 enter the collection hopper 5, from which the fuel is fed to the fine grinding mill 7, which is washed the flow of hot gases entering the mill through pipe 8 from the common channel 1.

The fuel crushed in mill 7, together with the flow of hot gases, is directed to the vertical pipe 9, and further drying occurs due to cooling of the hot gases. : This air mixture stream (a mixture of fuel with gas or air transporting it), just like the main FLOW, falls into a common box 4, In which large particles of fuel fall out of the stream again and are directly in mill 7. This cycle is for large the fuel particles continue until they are sufficiently crushed and discharged. Bottoms. The drying flows through the pipes 3 and 9 to the common box 4 are cooled to the same temperature. From box 4, the aero mixture is directed through a pipe 10 to a cyclone 11, in which the fuel falls out and the gases are sucked off by an exhauster 12, which creates a discharge in the whole system.

The thin line in the drawing shows the path of a single gas, the dotted line is the jerk of fuel, and the thick line shows the path of the aero mix.

For large installations operating on high-moisture fuel and producing fine-ground powder, the drip occurs sequentially in three or more vertical pipes, which are arally included in the gas flow (Fig. 2).

The fuel in each pipe is exposed to fresh hot gases. In order to speed up the drying process: and reduce the energy consumption for grinding, the fuel during the drying process is ground beforehand in a coarse grinding mill, after additional dehydration it is ground in a fine grinding mill, after which it is finally dried.

The flow of hot gases through the first pipe: entrains the raw 1 fed by the mill

coarse fuel, large particles of which fall out in separator 2, passes the collecting bin 4, from where the fuel is fed to the fine grinding mill 5, where it is grinded again, washed with hot gases and directed through a vertical pipe to the box 3 common to all the pipes. The loose large chambers pass into the collecting hopper 4, through the mill 6 fine mom and together with the hot gases enter the third pipe and again into the chamber 3, from where the mixture is fed into the cyclone, etc.

The subject matter of the invention.

Claims (2)

1. A device for grinding and drying the fuel by carrying it along with hot gases by pneumatic means through pipelines and mills, characterized in that the pipes 3 and 9 (Fig. 1) are connected to the upper ends of the common box 4 and the lower ends to the common channel 1 for supplying them from the latter by two parallel streams of hot gases: into pipe 3, receiving larger grinding from mill 2 directly, and into pipe 9i, intended for passing fine grinding through the mill. 7, into which, through the hopper 5, larger particles are released from the box 4, which are separated from the stream passing through the pipe 3. 2.Video modification of the device according to claim 1, characterized in that instead of two pipes with parallel currents of gases and fuel, three pipes (FIG. 2) or more are used, of which each large fuel particles released from it passes subsequent through hopper 4 or 4 and the mill that responds to it is 5 or 6. j phi | .2. Gttsz Ush five %., 2.:; -: