A multi-layer disc centrifugal and gravity film-forming microwave evaporation device

Abstract

The invention relates to a multi-layer disc centrifugal and gravity film-forming microwave evaporation device, which comprises a cylinder body, a central shaft, and a plurality of rotating conical disc assemblies and fixed conical disc assemblies arranged in alternate layers. The conical disc assembly is fixedly connected with the central shaft, and the fixed conical disc assembly is fixed on the cylinder body; above the cylinder body, there are feed liquid feeding joints and evaporated gas outlet joints, and the cylinder body There is a microwave heating device on it. The invention disperses the feed liquid into a uniform film layer to increase the specific surface area of ​​the film layer and the absorption intensity of microwave energy, improve the evaporation efficiency of the feed liquid; eliminate the incremental effect of heating steam on the gas phase in the evaporator In order to reduce the pressure on the gas-liquid interface of the material-liquid film layer, the evaporation temperature is conducive to the low-temperature evaporation of heat-sensitive volatile components, and with the condensation and gas-liquid separation device, distillation and extraction operations can be realized.

Description

technical field [0001] The invention relates to the technical field of evaporative separation or concentration of liquid mixtures, and more specifically relates to a multi-layer disc centrifugal and gravity film-forming microwave evaporation device. Background technique [0002] Liquid molecules have a tendency to escape or volatilize from the surface of the liquid phase due to molecular motion, and this tendency increases with the increase of temperature. Utilizing the difference in volatilities of the components in the liquid mixture, the volatile liquid phase in the liquid mixture is heated to vaporize, so that the liquid becomes vapor, that is, the so-called evaporation. [0003] During the evaporation process, the volatile components are concentrated in the vapor, and the less volatile components are also concentrated in the residual liquid, which realizes the separation of different components to a certain extent. The greater the difference in volatility between the c...

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Problems solved by technology

However, most of the film evaporators in the prior art are vertical, and the flow rate of the feed liquid in the evaporator cylinder is relatively fast, which easily leads to insufficient evaporation of volatile components, which affects the evaporation effect to a certain extent.

[0008] In this kind of separation, concentration and other distillation extraction or extraction devices based on the principle of material-liquid film layer evaporation, most of them adopt the heat transfer method of partition heating, that is, the heat medium such as hot steam or heat transfer oil in the jacket or interlayer, The wall material is heated first, and then the heat is transferred to the material liquid through conduction heating. During this period, the heat flow passes through multiple interfaces, which affects the improvement of heat exchange efficiency.

Another heat transfer method is to directly introduce hot steam into the evaporator, and heat and evaporate the surface of the material liquid through convective heating. The problem brought about is that water vapor is mixed into the gas phase volatiles, which additionally increases the subsequent gas-liquid separation load. may even affect the quality of the isolate

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