RU2156643C1 - Device for regenerative cleaning of air from finely dispersed noncohesive dust - Google Patents

Abstract

FIELD: hydraulic dust control in working zone. SUBSTANCE: device has cylindrical housing with inlet and outlet air branch pipes, foam generator, inner and outer contact cavities, separating unit, drain pipe for removal of liquid; besides that, device is additionally provided with siphon conjugated with limiting wall in form of inverted cone, spherical partition with straightway branch pipe and circular plates found under it; area of these plates reduces with distance from partition; inner edges of plates are bent downward and do not reach wall of straightway branch pipe forming circular slots with it; outer edges form slots with housing; outlet diffuser branch pipe is made in form of hyperboloid of revolution. EFFECT: enhanced efficiency of cleaning air from dust. 1 dwg

Description

 The invention relates to water dedusting of the air of the working area, which is implemented by the foam method, and can be used in any industry where hydrodynamic methods for cleaning air from dust are applicable.

 A device for dust collection is known, comprising a housing with inlet and outlet nozzles, a foam solution sprayer, foam-generating and defoaming mesh bags installed along the air (ed. St. 1456608 E 21 F 5/04, 1989).

 A device for wet gas purification is also known, comprising a housing with gas and liquid inlet and outlet nozzles, a contact plate made with holes, a separation device consisting of a conical plate and a contact pipe made in the form of truncated cones partially included in one another (ed. St. 1178473 B 01 D 47/00, 1984).

 The closest in design and the achieved effect is an air purification device, which is a vertical cylindrical body, which contains coaxially at the same level installed inlet and outlet pipes, drainage pipes for liquid outlet, a foam generator, an internal contact cavity with a hollow paraboloid cowl, an external contact cavity , separation devices made in the form of curlers having one direction, while the blades of the first along the gas curler are made floor with a decrease in the bore (ed. St. 1692619 B 01 D 47/04, 1991).

 However, using the known device, it is impossible to achieve high efficiency of air purification from fine dust due to the relatively short time of interaction of dusty air flow with a foaming agent solution. This device has a complex structure, which makes it difficult to manufacture.

 The essence of the invention lies in the fact that the cylindrical body with an air inlet pipe and an outlet diffuser pipe, a foam generator, internal and external contact cavities with a separation device, a drainage pipe for liquid outlet, additionally contains a siphon associated with a restriction wall representing a return cone, stepwise changing its taper and having perforation in the wall of a larger cone; a spherical partition, bent upward with a bushing under it in the form of a diffuser located along the axis of the housing, a separation device made in the form of a set of annular plates, the surface area of which decreases with distance from the partition, and the inner edges of the plates are bent down and do not reach the wall a passage pipe, forming annular slots with it, while the outer edges form slots with a body; while the output diffuser pipe is made in the form of a hyperboloid of rotation.

 The invention is illustrated in the drawing, which shows a section of the device.

 The device for regenerative cleaning of dusty air from fine non-sticking dust is a vertical cylindrical body 1 having a cover 2 made of a conical and ending with an output diffuser pipe 3 made in the form of a hyperboloid of rotation, as well as a conical bottom 4 with a shut-off device 5 for the discharge of sludge accumulated at the bottom .

 In the lower part of the housing 1 there is an inlet pipe 6 with a flange 7 for connecting the device as a whole to the duct network. This pipe 6 is connected to a siphon 8 having an opening 9 for draining excess foam solution, the other end of which is located along the axis of the housing 1 and is connected to a restriction wall 10 made in the form of an inverse cone, stepwise changing its conicity and having a perforation 11 in its upper part .

 Above the restriction wall 10, a diffuser nozzle 12 is located in the axis of the housing, while its lower part is at the same level with the first annular plate 13 in the direction of air movement, and the upper one is cut into a spherical partition 14 curved upwards, which has slots around the periphery fifteen.

 Under the partition 14 on the racks 16 there is a separation device made in the form of a set of annular plates 13, the surface area of which decreases with distance from it. The inner edges of the plates 13 are bent down to ensure reliable aerosol penetration into the formed gap gaps 17, while they do not reach the wall of the passage pipe 12, forming ring gaps with it, and the outer edges form gaps with the housing 1.

 A foam aerosol generator 18 is installed in the lower part of the housing 1 in a dusty air flow, which is supplied to the internal contact cavity 19 formed by a siphon 8, a restrictive wall 10 and a spherical partition 14.

 The external contact cavity 20 is formed by the housing 1 and the bounding wall 10.

 The device operates as follows.

 The foaming solution is supplied to the generator 18 and the filling of the siphon 8 with the foam aerosol is controlled through the open locking device 5. As soon as the foam aerosol starts to flow out through the opening 9, the locking device 5 is closed and the dusty air stream is supplied to the inlet pipe 6, from where it enters the siphon 8 where the initial stage of purification is realized due to its contact with a foaming agent solution. Further, the air enters the internal contact cavity 18, where it interacts with the active part of the foam aerosol jet formed by the generator 18. Some of the dust particles are released from the air flow due to the predominant effect of the adhesion and wetting forces and, together with the destroyed bubbles, flow down the boundary wall 10 into the siphon 8. Then, passing over the surface of the foaming agent solution in the slit gaps 17, the air flow organizes an intense foam layer. The design and placement of the plates 13 contribute to the intensification of the wetting process and the capture of the finest fractions of dust. The purified air through the outlet pipe 3 is discharged from the device.

 Gradually, the level of sludge retaining foaming properties reaches hole 9. Excess solution will flow out through it to the bottom 4, and then through the open locking device 5 into the drainage.

 The device allows the purification of ventilation air with a flow rate of 0.0083 - 0.0125 m / s from fine non-sticking dust (d = 1-10 microns).

 Experimental studies carried out on the laboratory model of the device showed that the cleaning efficiency of fine dust fractions was 78.6%, which exceeds the cleaning efficiency of known devices by 16%.

 The device allows you to implement the process of forced dispersion of dust by foam aerosol. For this, a nozzle 12 is installed in the center of the separation devices 13, through which part of the foam aerosol falls under the cover 2. In a long section, a satellite movement of air and aerosol is organized. Dust particles remaining in the air stream moistened with bubbles, due to increased windage, are removed from the outlet pipe 3 with subsequent sowing in a predetermined zone.

Claims (1)

 A device for regenerative cleaning of dusty air from fine non-sticking dust, containing a cylindrical body with an air inlet and an outlet diffuser, a foam generator, internal and external contact cavities, a separation device, and a drain pipe for liquid outlet, characterized in that the internal contact cavity is made in the form of a siphon conjugated to the boundary wall, which is a reverse cone, stepwise changing its taper and having a larger wall the cone is perforated, above the cone there is a spherical partition, bent upward with a passage through it in the form of a diffuser located along the axis of the housing, and the separation device is installed under the partition and made in the form of a set of ring plates, the surface area of which decreases with distance from it, internal the edges of the plates are bent down and do not reach the wall of the passage pipe, forming annular slits with it, and the outer edges form slots with the body, while the output diffuser pipe is made in the form of hyperbolas oida of rotation.