SU841679A1 - Ventilating mill - Google Patents

Description

one

The invention relates to crushing and grinding equipment and can be used for grinding brown coal in thermal power plants.

Constructions of fan-mill mills are known, which comprise a housing, a rotating rotor, and a feed nozzle. The output section of the supply pipe is made in the form of a hollow cylinder. Fuel is supplied to the rotor mainly through the lower part of the nozzle, and hot air (gas for drying and ventilation is supplied to the rotor over the entire cylindrical section of the nozzle H.

The performance of these mills is regulated by changing the amount of fuel supplied to the grinding and, accordingly, the amount of hot air (gas), for which various types of automatic circuits of the device are provided.

The disadvantage of these structures is that automatic control schemes have a large inertia in response and, most importantly, this regulation does not change the direction of air flow in the outlet section of the supply pipe, and therefore it is not effective enough in cases when it is necessary to quickly change the mode work, especially in mills of great productivity.

Mills-fans are also known, comprising a housing with a rotor located in it and a feed pipe equipped with a G2 shielding device.

0

Changing the direction of flow of hot air in front of the rotor, depending on the state and quality of the fuel, increases the grinding intensity.

five

The disadvantage of this construction is that the shielding device (damper) permanently closes the central region of the nozzle section and, moving up and down,

0 only changes the direction of the direct flow of air going through the center of the supply nozzle.

The purpose of the invention is to increase the productivity of the mill by means of a C9-d5 or a shielding device, which allows to regulate the direction and speed of the supplied air. .

This goal is achieved by the fact that in a fan mill comprising a housing with a housing located therein

the rotor and the inlet pipe provided with a screening device, the screening device is made in the form of paired rotary pie gates / pivot axes of which are diametrically opposite to the circumference of the feed pipe.

The rotary sectors have an independent drive that allows regulation in a wide range of speed and direction of the flow of ventilated air, providing, if necessary, the full opening of the entire cross section of the nozzle, which makes it possible to maintain the most advantageous operating mode of the mill.

FIG. 1 shows a fan mill, a slit; in fig. 2 shows section A-A in FIG. 1 (maximum closure of the upper half of the nozzle), in FIG. 3 - the same, partial closure / in FIG. the same, intermediate closure-, in FIG. 5 - the same, full opening of the nozzle section.

The proposed mill comprises a housing 1 with a rotating rotor 2 installed therein, a supply nozzle 3 in which pie slides 4 and a drive 5 slides are located.

During the operation of the mill, the fuel and hot air required for drying and ventilation enter the rotor 2 through the pipe 3, with fuel running down the bottom of the pipe and air throughout the rest of the section. During normal operation, the entire cylindrical section of the nozzle is open. If it is necessary to change the air flow for better lashing, then using the drive 5, the sector gates 4 turn to different positions, completely or partially blocking the upper half of the nozzle section. The cross-sectional area decreases, and consequently the air velocity increases. The optimal combination of changes in direction and air velocity makes it possible to maintain a high grinding intensity at different operating modes of the mill, depending on the state and quality of the fuel (reliability, calorie content, uniformity of composition, etc.), which ensures an increase in the mill's productivity.

Claims (2)

1. The patent of Germany No. 913731, cl. 50 C 8/00, 194E. 2. USSR author's certificate number 528413, cl. F 16 K 3/34, 1977. (rig. H Aa FIG. five