RU114620U1 - LIQUID GAS CONTACT DEVICE - Google Patents

Abstract

A device for gas-liquid contact, comprising a housing, an injection chamber, a sprayer, a mixer made in the form of a coaxially vertically installed pipe, a disperser perpendicular to the pipe axis, characterized in that the disperser contains curved blades and is rigidly connected to mixing blades and blades for defoaming.

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 [Utility Model Patent No. 86114 (MCP B01F 5/04)]. In this device, to intensify the mass transfer process by increasing the contact surface of the phases and the speed of its renewal, as well as to organize defoaming, an additional external mixer and disperser with curved blades are installed. The disadvantage of this device is the design complexity, its bulkiness, a significant increase in pressure and fluid flow.

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 spray, 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: the intensification of the mixing process by increasing the contact surface of the phases, the rate of updating and increasing the residence time of the gas in the apparatus by removing foam and additional mixing of the reaction volume.

The problem is achieved in that the device for contacting gas with a liquid comprises a housing 1; injection chamber 2; liquid atomizer 3; mixer 4; a rotating dispersant 5 located perpendicular to the axis of the pipe to which the mixing blades 6 and defoaming blades 7 are attached, which are rigidly connected by a rod 8 to the dispersant 5.

Figure 1 shows the proposed device for contacting gas with a liquid. Figure 2 presents a top view of the dispersant.

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. The first phase of liquid-gas contact occurs in the mixer, due to the developed surface of the atomized liquid. Depending on the mode of operation 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 mixers, the gas-liquid stream hits the dispersant 5 at a high speed. When the gas-liquid stream hits the dispersant, the gas bubbles are crushed, and the liquid jet striking the bent vanes of the dispersant 9 rotates it. The second stage of gas-liquid contact occurs. The resulting mixture rises up and enters the mixing device rotating with the dispersant. Next, gas bubbles rise up above the reaction volume, forming a foam which is removed by the defoaming device.

Additional mixing, as well as defoaming, significantly intensifies the process of mass transfer, the contact surface increases, its update rate increases, and the gas residence time in the device increases.

Claims (1)

A device for contacting gas with a liquid, comprising a housing, an injection chamber, a spray, a mixer made in the form of a coaxially vertically mounted pipe, a dispersant perpendicular to the axis of the pipe, characterized in that the dispersant contains bent blades and is rigidly connected to the mixing blades and blades for defoaming agents.