RU82583U1 - MIXING DEVICE FOR GAS SYSTEMS - LIQUID - Google Patents

Abstract

A mixing device for gas-liquid systems containing a housing, an injection chamber, a liquid atomizer, a vertical tubular mixer directed vertically downward, a dispersant located perpendicular to the axis of the mixer, characterized in that the propeller is fixedly mounted in the lower part of the mixer.

Description

The utility model relates to devices that are used for carrying out technological processes in gas-liquid systems to create intensive mixing of phases for the purpose of mass or heat transfer, to obtain thin gas dispersions, high gas content of the liquid phase, as well as chemical interaction. It can be used in oil refining, petrochemical, chemical and other industries.

The most promising methods of intensification of gas-liquid processes: phase inversion, the use of input and terminal effects, collision, swirl, mutual ejection of flows, imposition of pulsations and others.

Devices are known in which static swirlers are used to mix and crush flows. Swirling flow is widespread as a way of intensifying technological processes of heat transfer and mass transfer. For turbulization purposes, swirling flow is used, in particular, in innovative mixing devices of the German company Sulzer [Static mixers. Technological mixing and reactionary technologies. Sulzer Chemtech. 2005]. In such devices, static swirlers of complex design are installed in the pipeline. The disadvantage is the complexity of manufacture, design and increase the hydraulic resistance of the pipeline.

The closest structural analogue is an aeration device [ed. testimonial. USSR No. 593723 (M. Cl. B01F 5/04)], which is adopted as a prototype. The aerating device comprises a housing, an injection chamber, a liquid atomizer, a vertical tubular mixer, a dispersant located perpendicular to the axis

mixer. Liquid under pressure is supplied to the atomizer and sprayed, 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. Directly at the outlet of the atomizer in the injection chamber, the first stage of liquid-gas contact occurs. In the mixer, the second stage of liquid-gas contact proceeds, due to the developed surface of the atomized liquid, which causes phase inversion. At the outlet of the mixer, the gas-liquid mixture disperses upon impact, forming a fine dispersion, causing the third phase contact phase. The fourth stage of the developed contact of liquid and gas is carried out in the entire volume of the apparatus.

The disadvantage of the prototype is that the intensity of mixing, and consequently the mass transfer process, in the working volume of the reactor is much lower than in the mixer (vertical pipe), although the residence time of the liquid and gas in the working volume is much longer (hundreds of times) than in the mixer.

The objective of the proposed utility model: the intensification of the process of mass transfer by increasing the contact surface of the phases and the speed of its renewal. The problem is solved through the use of a stationary propeller, mounted in the lower part of the mixer.

The figure 1 shows the proposed mixing device for the gas-liquid system.

The mixing device comprises a housing 3, an injection chamber 2, a liquid atomizer 1, a mixer 4, made in the form of a vertical pipe of constant diameter, a dispersant 6 located perpendicular to the axis of the mixer and a stationary propeller 5, mounted at the bottom of the mixer.

The device operates as follows. Liquid under pressure is supplied to the atomizer 1, atomized and sucks in the gas entering the injection chamber 2. Directly at the outlet of the atomizer into

Injection chamber is the first stage of contact of liquid and gas. The resulting gas-liquid mixture passes through the mixer 4. In the mixer, the second stage of contact of the liquid and gas proceeds due to the developed surface of the atomized liquid, which causes phase inversion. 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. Upon exiting the mixer, the gas-liquid stream hits the propeller blades at a high speed 5. The third stage of gas-liquid contact occurs, the stream crumbles and acquires a steady swirling motion. When the gas-liquid stream hits the dispersant, gas bubbles are crushed. The fourth stage of gas-liquid contact occurs. Then the resulting mixture is distributed with swirls over the reaction volume of the apparatus 3. In the reaction volume, the fifth stage of gas-liquid contact is carried out.

Claims (1)

A mixing device for gas-liquid systems containing a housing, an injection chamber, a liquid atomizer, a vertical tubular mixer directed vertically downward, a dispersant located perpendicular to the axis of the mixer, characterized in that the propeller is fixedly mounted in the lower part of the mixer.