RU2264844C2 - Stream-inertial disc dust collector - Google Patents

Abstract

FIELD: the invention refers to the field of purification of technological gases and may be used for collecting large-,middle- and fine-dispersed dust.

SUBSTANCE: the dust collector has a slotted nozzle for feeding the gas flow installed under an angle to the horizontal axle and oriented downward tangentially to a convex curvilinear surface stationed with abutment to the upper part of the nozzle and discs partly submerged into liquid which serves for precipitation of large-dispersed dust. The discs are located opposite to the nozzle longitudinally relatively to the gas flow with ensuring rotation possibility in a backflow. At that the fine-dispersed purification of gas is conducted at contact interaction with the flow of liquid dripped in the shape of a film along the surface of rotating discs increasing effectiveness of the purification process.

EFFECT: increasing the degree of purification of gas from dust and decreasing aerodynamic resistance of the installation.

1 dwg

Description

The device relates to the field of purification of process gases and can be used to capture coarse, medium and fine dust.

A device for cleaning process and flue gases (patent SU No. 1699541 B 01 D 47/18). The device comprises a housing filled in the lower part with liquid and made in the upper part in the form of a half cylinder. When the gas stream passes through the housing and the rotating drum located in it with flags fixed on it using rods, the oscillation of the latter occurs, which leads to gas purification due to dust particles sticking to their surface. Installed rods at an angle to the oncoming flow affect the shape of the flags, i.e. add the shear wave to the longitudinal wave. The disadvantages of this device are: low quality of cleaning due to the fact that a significant part of the gas does not come in contact with the surface of the flags, leading to the removal of dust particles; rapid wear of tissue absorbent material.

A device is known for carrying out heat and mass transfer processes by contacting a gas stream with a liquid stream flowing in the form of a film on the surface of rotating disks partially immersed in a liquid (ed. St. USSR No. 223766, class B 01 D 45/10). The device comprises a housing with a gas channel and nozzles for supplying and discharging gas, in the lower part of which there is a bath with liquid, and a rotating horizontal shaft with a drive, equipped with disks partially immersed in the liquid. The shaft in this unit is installed across the gas flow, which increases the contact surface of the gas with the liquid and forms a longitudinal flow around the disks with low hydraulic resistance. The disadvantage of this device is the lack of preliminary cleaning of coarse dust, which leads to a decrease in the degree of cleaning and wear of the disks. This is due to the fact that it is intended only for heat and mass transfer processes.

Of the known closest in technical essence is a jet-inertial dust collector (patent RU No. 2159144, class B 01 D 45/06), which works as follows. Dusty gas enters the receiving device and then flows out of the slot nozzle located at an angle to the horizontal axis. The gas stream adheres to a convex curved surface and propagates in the circumferential direction according to the Coanda effect. Under the action of inertia forces, relatively large particles fly out of the jet and fall into the deposition chamber. After separation from the curved surface, the flow propagates according to the laws of an ordinary flooded turbulent jet. When a jet flows on a semi-cylindrical and flat walls in the stream, a dividing stream line is established. The gas located above this line enters the device for the removal of purified gas. A stream with a high concentration of dust spreads down from the dividing line along the half-cylindrical wall, forming a circulation flow. Under the action of centrifugal forces and gravity, the particles are separated through slots located in the lower part of the wall and are removed into the deposition chamber. The main disadvantages of this device are the relatively high aerodynamic drag due to the presence of a semi-cylindrical wall forming a swirling gas flow, as well as the absence of fine cleaning.

The proposed jet-inertial dust collector is aimed at increasing the degree of gas purification from dust and reducing the aerodynamic drag of the installation.

This is achieved by the fact that a device containing a slotted nozzle for supplying a gas stream located at an angle to the horizontal axis and a convex curved surface located adjacent to the upper part of the nozzle according to the invention is additionally equipped with rotating disks partially immersed in a liquid.

The introduction of rotating disks, on the surface of which a liquid flows in the form of a film, allows to increase the degree of purification by trapping fine dust and to reduce aerodynamic drag in comparison with the prototype. The liquid in the lower part of the unit (water or mineral oil), which serves for the deposition of medium and coarse dust, eliminates the possibility of secondary pollution of the gas stream.

The drawing schematically shows a longitudinal section of the proposed device.

A device for cleaning gas from dust contains a housing 1 with an inlet 2 and an outlet 3 nozzles, a convex curved surface 4, a slotted nozzle 5, rotating disks 6, partially immersed in a liquid 7.

The dust collector operates as follows. The dusty gas through the inlet pipe 2 enters the device 1 and flows out of the slotted nozzle 5, which is oriented downward tangentially to the convex curved surface 4, which is located adjacent to the upper part of the nozzle 5. The gas flow “sticks” to the convex curved surface 4 and propagates in the circumferential direction according to the coanda effect. Under the action of inertia forces, relatively large particles fly out of the jet and enter the liquid 7. Further, the process of cleaning fine dust takes place in the interdisk space upon contact interaction of the gas stream with the liquid stream flowing in the form of a film on the surface of rotating disks 6. To increase the area of the contacted surface the rotation of the disks 6 is made towards the gas flow.

The proposed device allows cleaning in two stages separately from coarse and fine dust, while achieving a high degree of purification. The introduction of disks allows to reduce the aerodynamic drag of the installation and, accordingly, the energy costs during operation. The proposed device has a small size and low cost.

Claims (1)

An inertial inertial dust collector comprising a slit nozzle for supplying a gas stream located at an angle to the horizontal axis, oriented downward tangentially to a convex curved surface located adjacent to the upper part of the nozzle, characterized in that it is provided with disks partially immersed in the liquid used for deposition coarse dust located opposite the nozzle longitudinally relative to the gas stream, allowing them to rotate in countercurrent and deposition on a wettable surface fine dust.