SU1311769A2 - Static mixer - Google Patents

Abstract

The invention relates to static mixers and makes it possible to increase mixing efficiency by reducing head losses. The mixer includes a housing in which elements of the mixing nozzle are installed. Each element has a cylindrical shell and alternating trapezoidal and triangular petals, with the triangular petals bent toward the center, and the trapezoidal ones facing outward until it touches the inner walls of the housing. The cross-sectional areas of the mixer, overlapped with triangular and trapezoidal petals, are equal, and the diameter of the cylindrical shell is determined by the formula e O / d / 2, where D is the internal diameter of the mixer body. This arrangement provides favorable conditions for redistributing the fluid, without creating either stagnant zones or return flows. 2 Il. 1 tab. C5 co

Description

The invention relates to mixing, can be used for mixing liquid components in the chemical, food, pharmaceutical and other sectors of the industry and is an improvement of the device according to the author. St. No. 1128970.

The purpose of the invention is to increase mixing efficiency by reducing head loss.

FIG. 1 shows the element of the mixing nozzle mounted in the mixer; in fig. 2 - the proposed mixer, the cross section.

Elements of the mixing nozzle are installed in the mixer housing 1, each of which has a cylindrical shell 2 and

a passage of 15 mm in the central zone of the mixer. The dimensions of the nozzle sections ensure the equality of the rates of the mixed liquids in the zone of their initial contact.

Two series of experiments are given at flow rates x in the mixer of 0.1 and 0.5 m / s, which are within the limits recommended for static mixers when processing liquids (0.03-1.0 m / s). Control of the degree of mixing is carried out visually 10 through a transparent mixer body.

The device works as follows.

When running onto the nozzle elements of the flow of mixed liquids (arrows a in Fig. 1), it is separated by lobes 3 and 4 on

a series of individual streams. Stream trapped

The trapezoid-15 alternating with each other on the trapezoidal petals (arrows b and triangular petals 3 and 4, respectively, fig. 2), move from the walls of the housing towards the center,

stately. At the same time, the triangular petals 3 and the streams that fall on the triangular petals are bent towards the center, and the trapezoidal 4-ki (arrows b) move from the center to the peripheric to contact with the interior. In case of equality of areas, overlaps of the hull and trapezoidal and triangular land areas of the cross-pestles, these flows (centripetal

b and centrifugal b) mutually replace one another without creating either stagnant zones or return flows. This creates the most favorable conditions for redistributing the division of the liquid, and therefore for its best mixing.

Passage of several packing elements successively, the liquid undergoes a multiple separation into radially displaced, interchangeable ones.

the bifurcated cross section of the mixer, overlapped by trapezoidal and triangular petals, are equal to each other. The ratio of the diameters of the shell of the nozzle d and the internal diameter of the mixer body is determined by the dependence

where D is the internal diameter of the mixer body.

In a laboratory flow mixer, JQ is different streams, which ensures fast

having a glass case with an internal diameter of 40 mm, several variants of the nozzle were tested. All variants of the nozzle have the same length of 30 mm, the same number of petals (5 trapezoid leveling of concentration and temperature over the entire cross section of the mixer.

After determining for each variant of the nozzle, the number of mixing elements required for complete mixing

and 5 triangular each, but 5 vanilla differ, and the installations in the mixer are precisely the diameter of the connecting shell. Water (85 vol.%) Supplied through the side nozzle is mixed with colored glycerin (15 vol.%), Which is fed through a recessed nozzle (not shown) with conditional

this number was measured; n; the pressure on the area occupied by the mixing elements.

The measurement results are shown in Table 1.

The diameter of the cylindrical shell, mm

20

D / d ratio

2.00

The number of mixing elements, after which the elementary streams are mixed to their visual indistinguishability at speeds, m / s

0.1 0.5

Head loss at flow rate 0.5 m / s, m 0.015

a passage of 15 mm in the central zone of the mixer. The dimensions of the nozzle sections ensure the equality of the velocities of the mixed liquids in the zone of their initial contact.

Two series of experiments are given at flow rates x in the mixer of 0.1 and 0.5 m / s, which are within the limits recommended for static mixers when processing liquids (0.03-1.0 m / s). The control of the degree of mixing is carried out visually through a transparent mixer body.

The device works as follows.

When running onto the nozzle elements of the flow of mixed liquids (arrows a in Fig. 1), it is separated by lobes 3 and 4 on

a series of individual streams. Stream trapped

alignment of concentration and temperature throughout the cross section of the mixer.

After determining for each variant of the nozzle, the number of mixing elements required for complete mixing

vani, and installation in the mixer

this number was measured; n; the pressure on the area occupied by the mixing elements.

The measurement results are shown in Table 1.

25

28

thirty

32

1.60

1.41

1.25

0,0130,010

0,0130,015

Claims (1)

Invention Formula Static mixer auth. St. No. 1128970, characterized in that, in order to increase mixing efficiency by reducing head losses, the cross-sectional area of the mixer, overlapped with triangular and trapezoidal petals of the mixing nozzle, are equal to each other, and the diameter of the cylindrical shell is determined by a formula where d internal diameter of the mixer body. Fi & .1 Fie.2