MVR evaporation system, and starting and preheating method thereof

Abstract

The invention relates to a MVR evaporation system, comprising a vapor compressor, a cyclone separator and a shell-and-tube heat exchanger, wherein the outlet of the vapor compressor is connected with a tube-side inlet located in the bottom of the shell-and-tube heat exchanger via a first pipeline provided with a first valve and also connected with a shell-side inlet located in the bottom of the shell-and-tube heat exchanger via a second pipeline provided with a second valve; the tube side of the shell-and-tube heat exchanger is connected with an exhausting branch provided with a fourth valve; a tube-side outlet located in the upper part of the shell-and-tube heat exchanger is connected with the separation inlet of the cyclone separator; and the upper separation outlet and the lower separation outlet of the cyclone separator are respectively connected with the inlet of the vapor compressor and the tube-side inlet located in the bottom of the shell-and-tube heat exchanger. According to the invention, a direct heating pipeline, a heat exchange pipeline, a non-condensable-gas discharging pipeline, a water supplementing pipeline and the like are reasonably arranged to heat feed liquid to an evaporation temperature before evaporation, and an auxiliary electric heater, an energy-storing water tank, external vapor equipment and the like in the flow of a general MVR system are discarded; so the structure of the MVR evaporation system is simplified, and the independent operation capability of the system is enhanced.

Description

technical field [0001] The invention relates to a mechanical vapor recompression (MVR) system and a start-up preheating method of the system, belonging to energy-saving technologies in the evaporation industry. Background technique [0002] The mechanical vapor recompression (MVR) system can recycle the secondary steam and only need to inject a small amount of energy to maintain the system operation, so it has the advantages of significant energy saving effect and small footprint. [0003] According to the search, the relevant patents are: the invention patent with the publication number of CN 103908788 A "an MVR heat pump evaporation system", the utility model patent with the publication number of CN 202777833 U "a mechanical vapor recompression evaporation device", the publication number is CN The invention patent of 103908789 A "A MVR heat pump evaporation system using energy storage water tank to accelerate start", the utility model patent "Single-effect falling film MVR...

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Problems solved by technology

[0004] The applicant believes that the above-mentioned patented technology generally has the disadvantages of low preheating efficiency, long time, and complex system configuration

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