RU1819680C - Aspiration system - Google Patents

Abstract

Usage: in industrial ventilation for cleaning air from dust particles. SUMMARY OF THE INVENTION: The system includes local suction pumps, a cyclone apparatus, two fans and a dust cleaning device of a second cleaning stage. By. On the axis of the cyclone exhaust pipe, a pipe is connected to the suction pipe of the fan, the discharge pipe of which is connected to the dust cleaning device of the second stage. The diameter of the suction tube is 0.1-0.2 of the diameter of the exhaust pipe, and their lower edges are installed at the same level. 1 ill.

Description

The invention relates to industrial ventilation and can be used to purify dust from air in the construction industry, metallurgy, food industry, etc.

The purpose of the invention is to increase the degree of air purification.

The drawing schematically shows a General view of the proposed system.

The aspiration system consists of a network of local suction pumps 1, connected by a highway 2 to a pipe 3 of polluted air of a cyclone apparatus, 4. A suction pipe 6 with a diameter of 1-0.2D of an exhaust pipe is installed along the axis of the exhaust pipe 5 of the cyclone apparatus 4, the lower cut of which is located at the level of the lower cut of the exhaust pipe 5, and the upper one is connected to the suction duct 7 of the fan unit 8 of the second cleaning stage 9. On the exhaust pipe 5 of the cyclone apparatus 4 there is a snatch spinner 10, the pipe of the purified air 11 of which is connected to the fan unit 12 of the first cleaning stage. At the entrance to the device

On the second stage of cleaning, a three-way shutter 13 of the recirculation duct 14 is connected, connected to the pipe 3 of the polluted air of the cyclone apparatus 4.

The aspiration system operates as follows.

Polluted air, aspirated by local suction pumps 1 through line 2 through pipe 3 enters the cyclone apparatus 4 for cleaning. Under the action of centrifugal force, dust particles separate in the stream, depending on their dispersion. In this case, large particles suspended in the stream are thrown onto the walls of the cyclone body 4 and, under the action of gravity, fall out of the stream into the hopper and are removed from the system. An ascending air vortex is formed in the axial region of the device, into which undetected finely dispersed dust fractions are introduced, which are directed together with the cleaned air to the exhaust pipe 5. The core of the vortex rotating as a solid has minimal static pressure

ate

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and, accordingly, the maximum axial velocities in the upward flow of the near-axis region. The presence of a radial pressure gradient causes the presence in the cyclone of a secondary circulation flow - a radial flow to the axis. This flow carries and collects fine dust particles not separated in the cyclone along the axis, as well as gas impurities lighter than air. A vertical pyramid tow is formed here with a diameter of 0.1-0.2 Ooh. Tr .. usually not captured by the cyclone apparatus.

. The dust and gas bundle is separated from the cleaned air by its suction through the axial suction pipe 6. The suction speed must be faster or equal to the axial velocity in the axial region of the cyclone 4. The cleaned air is removed from the cyclone through the exhaust pipe 5 and the spinner 10 by the fan unit 13 The contaminated axial dust and gas flow removed from the device by means of a tube 7 with a flow rate of 0.1-0.2 (10-20% of the initial amount of air) is sent through a fan unit of the second cleaning stage 8 to a fine tertiary treatment in a mustache trinity 9 of the second stage, after which it is released into the atmosphere. In the case of the ability of the captured dust to coagulate, a scheme can be applied in which the hazards captured by the pipe 6 are returned to recirculation through the air duct 14 to the cyclone

apparatus 4. In this case, the three-way damper 13 closes the entrance to the device of the second stage 9 and opens the entrance to the recirculation duct 14. If the dust is not coagulated, the duct 14 is closed, the inlet

§ filter - open.

 The described suction system makes it possible to drastically reduce cleaning costs by reducing the flow rate of air cleaned by the second stage by 80-90%.

Claims (1)

SUMMARY OF THE INVENTION An aspiration system comprising a cyclone, along the axis of the exhaust pipe of which a suction pipe is mounted, connected to a suction pipe of an additional fan, characterized in that, in order to increase the degree of air purification, it is equipped with a second stage dust cleaner connected to a discharge pipe of an additional valve torus, the diameter of the suction tube is 0.1-0.2 of the diameter of the exhaust pipe, and their lower edges are installed at the same level.