SU1755887A1 - Air purification method and device for its accomplishment - Google Patents

Abstract

Usage: air purification from fibrous dust and lint with a filter. SUMMARY OF THE INVENTION: The regeneration means installed inside the filter in the form of a flexible, long element communicate rotation with a speed sufficient to form a spiral. The diameter of the formed helix corresponds to the diameter of the filtering surface. The length of the flexible element set exceeding the length of the cleaned surface of the filter 2 S. p. f-ly, 1 ill.

Description

The invention relates to a method for purifying air from fibrous dust and fluff discharged from process equipment in enterprises of the textile industry, as well as to a device for implementing the method

Various methods are known for removing dust and lint from the filtering surface, for example, using a dust cleaning device containing a cylindrical filter and a filter regeneration means installed inside it, made in the form of a spiral.

Such a design provides for a strict correspondence of the size of the spiral to the internal diameter of the filter, since the coil has a constant diameter, and the gap between the coils of the spiral and the surface of the filter along its entire length should be as low as possible to ensure the cleaning efficiency. In order to maintain this minimum gap, a certain precision in the manufacture of the helix is needed. In addition, with the passage of air through

the filter made of cloth, the latter is inflated, the gap, especially in the middle of the filter, increases, thereby increasing the gap between the coil and the filter. This disadvantage leads to a decrease in filter efficiency.

A known method of air purification using a bag filter, including a housing, filter sleeves, multi-blade swirlers installed in them rotatably, to the blades of which are attached flexible elements with freely installed lower ends.

The disadvantage of this cleaning method is the instability of the continuous contact of vertically arranged flexible elements with the surface being cleaned when the filter is in operation due to the inflating of the filter cloth, and the fact that when the flexible element comes into contact with the sleeve, there is little effort to regenerate (the flexible element at its bottom, the unfixed, the part is acted upon by the reaction force directed opposite to the center of rotation

X |

O1 00

Xi

centrifugal force). These drawbacks lead to a decrease in cleaning efficiency.

The object of the present invention is to increase the efficiency of filter regeneration.

This goal is achieved by the fact that in a filter with a regeneration device installed inside it, in the form of a flexible long element, the latter is informed by rotation from a drive with a speed sufficient to form cntfpavfVi with a diameter corresponding to the inner diameter of the filter and comprising:

. 0)

where v is the rotation speed of the flexible long element;

Rc is the centrifugal force generated as a result of the rotation of the flexible element at a given point, it is directed along the normal from the center of rotation to the cylindrical filtering surface;

D is the diameter of the cylindrical filter;

m is the elementary mass of the elastic element. ,

The length of the flexible element is chosen to be greater than the length of the surface being cleaned and constituting

L ЈV (, rD f + h, (2)

where L is the length of the flexible element; H - the height of the cleaned surface of the cylindrical filter; h is the pitch of the helix;

D - the diameter of the cylindrical fltre Considering that

s-m m RC y, (3)

where f is the coefficient of friction of the elastic element on the filter surface,

N is the useful reaction force arising under the influence of PCs, directed downward along the filtration surface (cleaning force),

design speed is

(four)

v v NU

2f m Frequency of rotation of the elastic element

p 60 1000 V JiD

(five)

Substituting the value of the velocity v from equation (4) into equation (5), we obtain

The method can be implemented using the device shown in the drawing.

The device contains a cylindrical

a filter 1 made, for example, of a cloth or perforated sheet, connected to an air distribution box 2 and a chamber 3 for collecting dust, and a filter regeneration means in the form of an elastic long element 4; other flexible elastic material of various sections.

One end of element 4 is fixed on a disk 5, kinematically associated with a drive (not shown). The other end of element 4 is not fixed.

The device works as follows.

When the disk 5 rotates under the action of centrifugal forces, the element 4 takes the form of a spiral, while its turns tightly adjoin the inner surface of the filter and clean it

The main parameters of the filter, the speed and frequency of rotation of the elastic element of the regenerating means are determined by formulas (2), (4) and (6).

Example Based on the operating experience of bags and other filters and for design reasons, we specify: mm, taking into account the expansion of the sleeve in the middle of the filter (700 mm diameter) sleeve material - melange cloth; material of the elastic element - steel cable b mm; f 0.3 is the coefficient of friction for a pair of cloth with steel; gp 1,5. kg - weight of 1 cm steel cable; N 0.04 kg is a prerequisite for effective filter cleaning; mm - height of the filtration surface; mm - spiral pitch.

By the formula (2) determine the length of the elastic element

(D ffh2 9.3m

By the formula (4) determine the speed of rotation of the elastic element

V VJ3IZr 2f m

By the formula (6) determine the frequency of rotation of the elastic element

P

60 1000

U / EG

2f m D

- 149 ° / min

60 1000

P

V.

N

2 f m D

(6)

Thus, the proposed device is quite simple in design,

provides a spiral with coils, taking the size in accordance with the diameter of the cylindrical filter, and, therefore, provides reliable contact with the inner surface of the filter and as a result - more effective regeneration.

Fo rumula and z ore n 1. The method of cleaning the air with a filter with a means of regeneration installed inside it in the form of a flexible long element rotating from the drive, characterized in that, in order to increase the regeneration filter, the flexible element is given rotation at a rate sufficient to form a spiral with a diameter corresponding to the diameter of the filter and

ugtcr-r- 2t

where v is the speed of rotation of the flexible element:

Rc - centrifugal force:

D is the diameter of the filter;

m is the elementary mass of the flexible element.

2. An air purification device comprising a filter and rotatably mounted regeneration means inside it in the form of a flexible long element, characterized in that, in order to increase the filter regeneration efficiency, the length of the flexible element L exceeds the height of the filter surface H being cleaned by an amount sufficient to form a spiral and is

(7rD) 4h2,

where h is the pitch of the spiral of the flexible element; D is the diameter of the filter.

Claims (2)

Claim 1. A method of purifying air using a filter with regeneration means installed inside it ·· of a flexible long element rotating from the drive, characterized in that, in order to increase filter regeneration, the flexible element is informed of rotation at a speed sufficient to form a spiral with diameter corresponding to the diameter of the filter, and component. V = d / ^F u ' ^p where v is the rotation speed of the flexible element; Fq - centrifugal force: D - filter diameter: m is the elementary mass of the flexible element. 2. A device for air purification, comprising a filter and regeneratively mounted regenerative means 10 in the form of a flexible long element, which is included in that, in order to increase the efficiency of the regeneration of the filter, the length of the flexible element L exceeds the height of the cleaned surface of the filter N by an amount sufficient for the formation of a spiral and is L = - ^ V (7tD) ^? + h ² . where h is the spiral pitch of the flexible element; D is the diameter of the filter.