SU1599069A1 - Venturi heat-mass-exchange apparatus - Google Patents

Abstract

The invention relates to heat and mass transfer apparatus and can be used in the chemical industry, in particular for the concentration of acids, for example sulfuric acid, and to increase the service life of the apparatus by reducing the decomposition of sulfuric acid. The Venturi heat and mass transfer apparatus includes a confuser, a neck, a diffuser with a coaxially mounted insert, made in the form of a combination of a nozzle, a confuser and a shortened diffuser. The confuser and the diffuser of the partition are made inside and outside by helical guides, while the outer guide is made with a step smaller than the step of the inner guide, and the nozzle is made in the form of a ring with outlet openings located inside the front part of the confuser of the partition made in the form a thickening having a drop-shaped profile in the section, behind the frontal surface of a drop-shaped thickening that forms the shape of a Lawal nozzle in section. The shortened diffuser can be made with a curvilinear generator with an opening angle less than the opening angle of the diffuser of the Venturi apparatus. 2 hp ff, 4 ill.

Description

The invention relates to heat and mass transfer apparatus and can be used in the chemical industry, in particular for the concentration of acids (for example sulfuric acid) o

The purpose of the invention is to increase the efficiency and increase the service life of the apparatus by reducing the decomposition of sulfuric acid.

The figure shows the proposed apparatus, in which the front part

cut off; Fig 2 - section aa. On the FIGURE — an apparatus in which the inner and outer surfaces, the inserts are made with helical guides,: FIG. 4 — section BB in FIG.

The device contains a confuser 1, a neck 2, a diffuser 3, an insert 4, made in the form of a combination of a confuser (nozzle) 5, a diffuser 6 of shortened length with a curvilinear generatrix and a nozzle 7 with outlets -.

SP

with

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ABOUT

about: with

8. The front edge of the nozzle is Kgshevidnoy form 9, inside which is located the nozzle 7. The supply of weak sulfuric acid to the nozzle is made through the nozzle 10.

 The inner surface of the insert 4. (Fig. 4) is provided with a helical guide 11. The outer surface of the insert 4 is provided with a spiral guide 12 with a step smaller than the pitch of the inner guide. Thickening drop-shaped 9 (fig.Z) has a profile Laval nozzle 13.

The device operates as follows.

The flue gases from the furnace enter through the flue and the confuser 1, and then the main gas flow enters the partition through the Laval nozzle 13 and the confuser 5. Here too, sulfuric acid with a concentration of 68-70% enters through the nozzle 10 into the nozzle 7 and outlet 8. Since the outlet openings are located behind the frontal surface of the teardrop-shaped thickening, a suction is formed in these areas, contributing to the dispersion of droplets of weak sulfuric acid to sizes between 100 and 400 microns. The passage then through the confuser and the diffuser of the insert, with the help of spiral-shaped flow and gas fluids, is stabilized, as a result of which excessive turbulization is eliminated, which ensures effective concentration in the mode of displacement.

The swirling gas-liquid flow at the exit from the partition is stabilized in space and does not reject to the walls, which prevents decomposition of the acid and fogging, then it goes to the separation.

Another part of the flue gases passes through the gap between the body of the confuser 1, the neck 2 and the insert 4, and with the help of guides on the outer part of the partition, it twists and moves near the walls of the apparatus, protecting it from the effects of sulfuric acid droplets.

Due to the fact that the partitions on the outer part of the partition have a step smaller than the step inside the partition, the prerequisites are created, which separate these flows (the flow of flue gases at the periphery of the apparatus and the central flow containing drops of sulfuric acid).

Thus, in the proposed apparatus, by inserting a combination of a nozzle, a confuser and a shortened curvilinear diffuser with an opening angle less than the opening angle of the Benturi apparatus diffuser, or with the screw-shaped guides on the inner and outer surfaces of the insert, reducing the decomposition of sulfuric acid to sulfur oxides by reducing the flow turbulization | And reducing the contact of sulfuric acid droplets with the walls of the apparatus, reducing hydraulic resistance in the apparatus ate due to the profile of the leading edge structure and converger vi standing, the replacement or the insertion of its manufacture more krrrozion- nostoykih materials allows to extend the life of the unit.

Claims (3)

1. The Venturi heat and mass transfer apparatus, which includes a confuser, a neck, a diffuser, a coaxially installed insert, nozzles for input and output of phases, a nozzle, is different in order to increase efficiency and increase the life of the apparatus by reducing the decomposition of sulfuric acid, the insert is made in the form of a confuser and a shortened diffuser, and the nozzle is made in the form of a ring with outlet openings located inside the forward part of the confuser of the insert along the gas flow, which has a drop-like shape in cross section. 2. The apparatus according to claim 1, wherein the shortened diffuser is made with a curvilinear generatrix with an opening angle less than the opening angle of the diffuser of the Venturi apparatus 3. The apparatus according to claim 1, wherein the inner and outer surfaces of the confuser and the shortened diffuser of the insert are made with helical guides, wherein the pitch of the outer guide is larger than the pitch of the inner guide, and the front part of the confuser is made as a thickening, with a profile of Lawal nozzle. H F W 1854B FIG. i ig.2 3 in 7 ue.j 7 Lt2.