Low-temperature vacuum evaporator capable of being preheated quickly

Abstract

The invention relates to a low-temperature vacuum evaporator capable of being preheated quickly, which comprises: an evaporation tank, wherein a steam outlet, a concentrated liquid outlet and a waste liquid inlet are arranged at the evaporation tank; a first heat exchanger which is arranged inside or outside the evaporation tank; a condensation tank which is connected with the steam outlet, wherein a second heat exchanger is arranged in the condensation tank and used for cooling steam generated in the evaporation tank; a heat pump system which comprises a compressor and a throttling device which are respectively connected with the first heat exchanger and the second heat exchanger so as to provide a heat exchange medium for the first heat exchanger and the second heat exchanger; a pressure reducing device which is used for vacuumizing the evaporation tank and the condensation tank; and a heating assembly which is arranged inside or outside the evaporation tank and is used for heating the waste liquid. The low-temperature vacuum evaporator can actively heat waste liquid entering the evaporation tank, so that steam is formed in the evaporation tank to exchange heat with a heat exchange medium in the condensation tank, and then the heat exchange medium is supplemented to the compressor.

Description

technical field [0001] The invention relates to a low-temperature vacuum evaporator capable of rapid preheating, which belongs to the field of environmental protection equipment. Background technique [0002] Energy issues and environmental issues have become increasingly prominent in industrial production, which puts forward higher requirements for energy-saving technologies. The discharge of hazardous waste liquids such as industrial wastewater has caused serious environmental pollution. In order to protect the environment, it is necessary to strictly control the discharge of sewage. All large-scale landfill enterprises need to discharge sewage to special sewage treatment plants for treatment before discharge. Sewage treatment The factory generally charges according to the treatment volume, such as several thousand yuan per ton. Therefore, the cost of sewage treatment for enterprises has also increased significantly. [0003] Heat pump technology is an efficient, environm...

AI Technical Summary

Problems solved by technology

However, when the ambient temperature is low, for example, in winter in northern cities, the ambient temperature is below zero, and it takes a long time and energy to heat the waste liquid to 30-40°C

Moreover, since there is no steam generated in the evaporation tank at this time, the compressor in the heat pump system cannot be supplemented by the heat exchange medium, and will be in a low-load operation state, and thus cannot provide heat exchange medium for heating the waste liquid

Therefore, the equipment is often unable to start, and the compressor is easily damaged

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