RU86114U1 - LIQUID GAS CONTACT DEVICE - Google Patents

Abstract

1. A device for contacting gas with a liquid, comprising a housing, an injection chamber, an atomizer, a mixer made in the form of a coaxially mounted pipe directed vertically downward, a dispersant perpendicular to the axis of the pipe, characterized in that an additional external mixer is installed, coaxial with the existing one and creating with it an annular space for the movement of gas-liquid flow. ! 2. The device according to claim 1, characterized in that an upper dispersant with curved blades is installed above the reaction volume for crushing the gas-liquid stream and spraying the liquid.

Description

The utility model relates to devices that are used to carry out the processes of mixing liquid with gas, as well as their chemical interaction. It can be used in the oil refining, petrochemical, chemical, food, pharmaceutical, microbiological and metallurgical industries.

In order to intensify the process of mixing the phases, an alternating change in the shape and direction of the flow, impact of the flow on solid obstacles — chippers, twisting, mutual ejection and phase inversion, application of pulsations, and effective atomization of the liquid are used.

A device is known in which many of these intensification methods are used [ed. testimonial. USSR No. 1263330 (MKP B01F 5/04)]. In this device for the intensification of the mass transfer process by increasing the contact surface of the phases and the speed of its renewal, four additional mixers are installed in the horizontal plane. The disadvantage of this device is the design complexity, a significant increase in pressure and flow rate, which is fed to five mixers. In addition, phase inversions do not occur in short mixers.

Many mixers are known in which mixing energy is supplied in the form of hydraulic energy of the mixed fluid streams themselves. The supply of energy to the flows, carried out by pumps mounted in a convenient location of the production plant, the absence of movable elements in the mixer itself, technically simplifies the process of mixing.

Physically, the principle of operation of such mixers is to create high shear stresses in the fluid flow by twisting the flow using turbulent inserts. The swirling of the flow can be carried out by tape swirlers [US Patent 3949970, French Patent 2301281], tangential inlet of a fluid flow [ed. testimonial. USSR 1487961, (MKP B01F 5/00)], with blade rotators [Antufiev V.M., Vedeneev V.A. - Chem. and oil. mechanical engineering, 1974, No. 1, s.16-18.].

In order to efficiently spray liquid, mechanical sprayers are widely used [Pazhi DG, Gaustov B.C. Sprays of liquids. - M .: Chemistry, 1979, p.109-138]. The principle of operation of mechanical sprayers with a direct supply of liquid to the spraying element is that the liquid is gravity-fed or under some excess pressure is supplied to the working element, spreads over it and is sprayed.

The advantage of disk sprayers are: the ability to control performance in the range of ± 50% without noticeable change in dispersion; the ability to work on contaminated and highly viscous liquids; comparative ease of abrasion protection.

The closest structural analogue is an aeration device [ed. testimonial. USSR No. 593723 (MKP B01F 5/04)], which we will take as a prototype. The aerating device comprises a housing, a liquid atomizer, a mixer made in the form of a vertical pipe, a dispersant located perpendicular to the axis of the pipe.

Liquid under pressure is supplied to the atomizer and atomized, creating a high-speed flow. The high-speed flow of the atomized liquid creates a vacuum in the injection chamber, which allows the gas phase to be sucked into the mixer. In the mixer, the first phase of liquid-gas contact occurs, due to the developed surface of the atomized liquid. At the outlet of the mixer, the gas-liquid mixture is dispersed, forming a fine dispersion, causing the second phase contact phase.

The disadvantage of the prototype is the inefficient use of the volume of the apparatus with the existing possibilities of intensification of the ongoing mass transfer process, as well as the formation in some cases of a significant layer of foam on the surface of the liquid, which leads to the penetration of this foam into the pipe for gas outlet.

The objective of the proposed utility model is: intensification of the mixing process by increasing the contact surface of the phases, the rate of its renewal, and the growth of the volume of gas saturated per unit time by installing an external pipe relative to the existing mixer and a flow dispersing disk (upper dispersant) with curved blades.

This object is achieved in that the device for contacting gas with a liquid comprises a housing 1, an injection chamber 2, a liquid atomizer 3, two coaxially mounted mixers 4 and 5, made in the form of vertical pipes (internal and external short), dispersants 6 (lower) and 7 (upper), located perpendicular to the axis of the pipe. Dispersant 5 is installed above the reaction volume, has curved blades 8 and is fixed to the pipe 4.

Figure 1, 2 shows the proposed device for contacting gas with a liquid.

The device operates as follows.

The liquid under pressure is supplied to the liquid atomizer 3, atomized and sucks in the gas entering the injection chamber 2. The resulting gas-liquid mixture passes through the mixer 4 and through the annular space between the mixers 4 and 5, with most of the flow passing through the mixer 4 (more than 70% of the generated gas-liquid mixture). In mixers, the first phase of liquid-gas contact occurs due to the developed surface of the atomized liquid. Depending on the operating mode of the mixer, its geometrical parameters and the pressure drop across the atomizer, a gas-liquid two-phase flow with a different ratio of liquid to gas can form in the mixer. The two-phase flow can be with a dispersed liquid or gas phase. Under certain conditions, phase inversion can occur in the mixer itself, and the gas phase becomes dispersed. This mode of operation is most effective due to the fact that at the moment of inversion the highest value of the mass transfer coefficient is observed.

When exiting the mixer 4, the gas-liquid flow hits the dispersant 6 at a high speed. When the gas-liquid flow hits the dispersant, the gas bubbles are crushed. The second stage of gas-liquid contact occurs. Then the gas bubbles rise up and are removed through the pipe to exit the gas.

The gas-liquid stream exiting at a high speed from the annular section between mixers 4 and 5 hits the dispersant 7, which is a disk with curved blades. Upon impact, the gas-liquid flow is crushed. In this case, the gas flow rises up to the outlet pipe. The liquid due to the curved blades is fan-shaped over the reaction volume and is in contact with the gas leaving the reaction volume, thereby increasing the contact time of the bulk of the gas with the liquid. Then, liquid droplets fall on a layer of foam formed above the reaction volume, destroying it.

Claims (2)

1. A device for contacting gas with a liquid, comprising a housing, an injection chamber, an atomizer, a mixer made in the form of a coaxially mounted pipe directed vertically downward, a dispersant perpendicular to the axis of the pipe, characterized in that an additional external mixer is installed, coaxial with the existing one and creating with it an annular space for the movement of gas-liquid flow. 2. The device according to claim 1, characterized in that an upper dispersant with curved blades is installed above the reaction volume for crushing the gas-liquid stream and spraying the liquid.