SU831696A1 - Feeder for pneumatic conveying of loose materials - Google Patents

Description

(54)

FEEDER FOR PNEUMATIC TRANSPORT OF BULK MATERIALS

This invention relates to pneumatic conveying of bulk materials.

According to the main author. St. No. 700404 is known for a feeder for pneumatic conveying of bulk materials, comprising a housing with a transport pipeline placed in it and an aerating device and a nozzle nozzle installed in the bottom of the housing, the airframing device being designed as concentric with a nozzle of a mushroom-shaped chamber with holes in its bottom part the inner surface of the bottom of the housing has the shape of a surface of rotation, the forming line of which is the line of constant pressure 1.

A disadvantage of the known feeder is that in its operation, especially in. P | 1lamenta planned and sudden stops, usually there are obstructions by the material of the active suction zones, which does not allow for the forced reliable start of the installation, as well as to take the feeder in a short period of time for a more economical mode of operation.

The purpose of the invention is to increase the reliability of the feeder operation by eliminating material blockages in the active suction zone.

The goal is achieved by the fact that the feeder is provided with a glass-shaped chamber installed inside the aerating device coaxially with the nozzle and communicated with the upper part of the body.

The drawing schematically shows the proposed feeder, the section.

The feeder includes a housing 1 with a central transport pipeline 2 and nozzles 3.. The aerating device is made in the form of a free mushroom-shaped chamber 4, in the lower part of which holes 5 are made. The bottom 6 of the housing is a surface of rotation, the forming line of which is a constant pressure line. The chamber 7, which is shaped like a glass, is installed coaxially with the nozzle 3 and is co-priced by means of the valve 8 and the pipeline 9 with the upper part of the housing 1. Supply, control and regulation of air pressure is carried out by means of air ducts 10

and 11, pressure gauges 12 and 13, gearboxes 14 and 15, as well as throttles 16 and 17. The compressed air generator is a blower unit 18.

The feeder works as follows.

After the feeder stops, suction zones are formed at start-up, compressed air from unit 18, through choke 17, gearbox 15 and nozzle 3 fills line 2. After the transition time in the duct 11 at the moment when the valve 8 is closed, the compressed air reaches a certain pressure, controlled by the pressure gauge 13, and in the quantity necessary for aeration of the material, flows through the throttle 16, the reducer 14, the air duct 10 into the chamber 4. When a certain pressure is established by the pressure gauge 12, the air leaving the cutting hole 5 is formed into flat streams of flow along the surface of the bottom 6 of the housing 1 and rushes first along the near-wall region until pressure builds up over the entire height of the feeder chamber. With the establishment of a pressure balance, the airflow changes the direction of movement and entrains material particles into the rarefaction zone under the dam layer. In this case, one can expect significant irregularities in the local values of the velocities of the air and solid phases with the subsequent formation of non-blown volumes of solid material. Such irregularity can lead to the fact that in some zones of the feeder the air speed will be insufficient for aerating the material and the flow of the unit at a solid will be lower than the nominal value. and

air flow with a fairly high standard deviation

31696.-4

rushes to the upper part of the housing 1, then through the pipe 9 and the chamber. forced reliable start-up and exit of the installation in a relatively short period of time for a more economical mode of operation.

JQ The process of forceful action of an upward air flow with solid particles proceeds as an avalanche-like process, and therefore the time of the valve in the open position is established experimentally for

J5 installation, transported material and characteristics of the route.

The use of the proposed feeder allows an increase in the rate of upward air flow within the established limits.

20, by artificially increasing the pressure drop across the layer between the glass-like chamber and the upper part of the body, which certainly contributes to the implementation of a forced, reliable start of the installation.

Claims (1)

Invention Formula 1. Feeder for pneumatic conveying of bulk JQ materials according to ed. St. No. 700404, which is designed to increase reliability by eliminating material blockages in the active suction zone, it is equipped with a glass-shaped chamber, installed inside the aeration device coaxially with the nozzle and communicated with the upper part. enclosures. Sources of information taken into account in the examination 401. USSR author's certificate According to the application N 2651010, cl. B 65 G 53 / 50,1978,