Cooling evaporating treatment method and cooling evaporating treatment apparatus of high boiling point liquid

Abstract

The invention discloses a cooling evaporating treatment method of a high boiling point liquid. The cooling evaporating treatment method comprises: heating a high boiling point liquid by using a low-temperature heat source; carrying out heat transfer and mass transfer through direct contact between low boiling point non-condensable gas used as a circulating carrier gas and the high boiling point liquid, wherein the circulating carrier gas reduces the steam partial pressure and the evaporation temperature of the high boiling point liquid; and carrying out steam stripping and evaporation on the heated high boiling point liquid to concentrate the high boiling point liquid so as to obtain a concentrated liquid, and carrying out cooling condensing on the saturated circulating carrier gas to obtain a condensed liquid. According to the present invention, through the low-temperature evaporation characteristics, the utilization efficiency of the low-temperature heat source is improved, the influence of corrosion caused by the corrosive medium is reduced, and the low-grade material can be used; and with the method and the apparatus, the fouling speed of the equipment and the pipeline are slowed down, and the continuous operation time is prolonged, such that the investment in the equipment is reduced, and the routine maintenance cost is reduced.

Description

technical field [0001] The invention relates to a method and device for cooling and evaporating liquids with a higher boiling point, especially for the low-temperature evaporation of chemical / pharmaceutical sewage containing high salt and high COD, the evaporation, concentration and crystallization of industrial salt liquid, the treatment of coking wastewater, garbage Landfill leachate treatment, power plant desulfurization wastewater treatment, coal chemical pressurized fixed-bed gasification wastewater treatment and other fields, use low-temperature heat or waste heat or waste heat or geothermal or solar heating below the boiling point of the liquid to treat sewage Or the low-temperature evaporation of industrial salt liquid liquid to achieve the purpose of separation or concentration, which belongs to the field of waste heat recovery and utilization, the treatment and recycling of sewage containing salt and COD, the environmental protection field, and the field of salt liqui...

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Problems solved by technology

This technology overcomes the defects of large amount of biochemical treatment, difficult water inflow, high investment cost, high energy consumption of the system, difficult operation, and large floor area in the traditional process.

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