Thermodynamic fluidized evaporation separation device and process with external pressurization

Abstract

A thermodynamic fluidized evaporation separation device and process with external pressure, including an evaporator, a heat exchanger arranged on the evaporator, a heat source connected to the heat exchanger, and a heat source connected to the evaporator The auxiliary external pressurization device, the solid wet material enters the evaporator, through the indirect heat exchange with the heat exchange medium in the heat exchanger, the moisture in the wet material is evaporated, and is released from the solid wet material in the form of gas Separation and generation of secondary vapor, the generated secondary vapor is mixed with supplementary gas input from the auxiliary external pressurization device and overflows from bottom to top inside the evaporator. In the whole process of evaporative separation, the present invention realizes efficient and fast dehumidification of wet materials in the constant-speed drying stage in the fluidized bed section of the evaporator, and maintains low energy consumption and deep dehumidification in the drying stage of wet materials in the moving bed section of the evaporator. Wet, so that the energy consumption of the entire evaporation and separation process is matched optimally, and the process is energy-saving and efficient.

Description

technical field [0001] The invention relates to a thermodynamic fluidization evaporation separation device with external pressure for separating moisture in wet materials, and at the same time relates to a thermodynamic fluidization evaporation separation process with external pressure. Background technique [0002] In industrial production, the moisture contained in many types of high-humidity materials needs to be reduced to a lower moisture content. Taking lignite as an example, whether it is burning, transporting or meeting the requirements of coal chemical technology, it is often necessary to divide the initial moisture into 30 %-60% lignite is dried to a lignite product with a final moisture content of 3%-5%. [0003] Conventional equipment and methods for drying high-humidity materials use: A) hot flue gas as a heat source to directly heat materials, or B) hot steam as a heat source to indirectly heat materials. Due to the high volatile content of the material or the...

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Problems solved by technology

The drying efficiency of the wet material is higher when the technical solution of CN101581533A is used in the constant-speed drying stage; but in the drying-down stage, since the drying rate mainly depends on the migration rate of moisture inside the material, if the technical solution of CN101581533A is continued, due to the wet material The state of motion has little effect on its dehydration rate. At the same time, the material to be dried such as lignite must be maintained in a "fluidized" state through high energy consumption, resulting in the problem of high energy consumption per unit of product production.

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