SU897291A1 - Method of grinding fuel in ball-type drum mill - Google Patents

Description

(54) METHOD OF SMOKING TONJLIiBA IN BALL DRUM MILL

I

The invention relates to methods for grinding materials in dry grinding ground ball drum mills and can be used in the power industry and chemical industry.

A known method of operation of a ball drum mill in which solid fuel and hot gas is fed into the drum, a ventilating drum along its entire length p

This method is characterized by insufficient economical grinding.

The closest technical solution to the invention is the method of grinding fuel in a spherical gas mill, ventilated with hot gas. In this method, part of the venting agent that has passed through the mill drum, the separator, the cyclone, the mill fan, returns to the drum ventilation in the upper neck in the form of so-called recirculation. Experimental verification and operating experience

show that the use of such ventilators / killer agent is much more efficient than the use of clean air or flue gases.

The disadvantage of this solution is that the additional ventilating agent in this case passes through the entire length of the drum, the ventilator of the zone with a large target, which leads to excessive fuel generation through the dust system, which reduces the grinding efficiency.

The aim of the invention is to increase the grinding efficiency by enhanced ventilation of the drum area.

5 containing the largest amount of finished drink ..

This goal is achieved by the fact that according to the method of grinding fuel. WA in a ball drum mill

20 ventilated with hot gas, a mixture of gas and water is additionally supplied to the mill at a distance from the output of not more than 1/3 of the drum length.

.pair and fine dust in a ratio by weight of 1: (0.06-0.02) :( 0.05-0.01). The drawing shows a scheme for implementing the method.

The raw coal from the hopper 1 is fed through the patel 2 to the mill 3, where it is softened and dried by a stream of hot gas coming through the gas line 4. From the mill 3, the ground agent is crushed and dried particles are carried to the separator 5, from which fine dust is prepared enters cyclone 6, and large particles return through the return line to the mill. Ready drink from cyclone 6 enters the dust bin 7 and further along the return pipeline to the mill. Ready dust from the cyclone 6 enters the dust bin 7 and further along the dust pipes 8 to the burners of the boiler unit. Dust gas from the cyclone 6 enters the grill fan 8. From the gas pipeline 9, from where to get to the dump for the boiler, or to the furnace of the boiler. Part of the exhaust gas from the pipeline 9 through the pipeline 10 recirculation to the inlet neck of the mill. Another part of the gas in the mill fan 8 is enriched with fine pichy in the pieconcelerator 1 1 and through pipe 12 with the gate 13 enters the output part of the mill drum, where is located 972914

a greater amount of fine dust, increasing the ventilation of this particular zone, thereby increasing the efficiency of the entire system

5 pie preparation.

An open-type dust system with a mill W-50 is used to verify the proposed method. When you turn on the device in the gate

“About 13, the mill productivity is increased by 2.5–5 t / h, the specific energy consumption is reduced by 0.81, 8 kWh / ton of fuel.

Claims (2)

1. Romadin V.P., Prepaid dust. M.-L., Gossenneizdat, 1959, with. 5-7. 2. Experience of operation and setup of Pshesystems W - 50. - Energetic, 1969, № 4 (prototype).