Two-stage compression heat pump seawater desalination device with combined action of freezing and evaporation

Abstract

The invention belongs to the technical field of seawater desalination, and concretely relates to a two-stage compression heat pump seawater desalination device with combined action of freezing and evaporation. A refrigerant circulating system comprises a first compressor, a first condenser, a first throttle valve, an evaporator, a second compressor, a second condenser, a second throttle valve, a gas-liquid separator and a third heat exchanger; a first seawater desalination system comprises a first seawater tank, a first water pump and an evaporator; and a second seawater desalination system comprises a second seawater tank, a second water pump, a first condenser, a second condenser, a vacuum pump, a second heat exchanger and a freshwater tank. Freshwater is prepared by adopting a two-stagecompression heat pump technology, and seawater is frozen on the evaporator side to form salt-free ice; seawater is heated on the condenser side to form salt-free water vapor, and the seawater is heated by the two condensers to easily reach the boiling point and be evaporated; and ice on the evaporator side can be melted through refrigerant circulation.

Description

technical field [0001] The invention belongs to the technical field of seawater desalination, and in particular relates to a two-stage compression heat pump seawater desalination device with combined freezing and evaporation functions. Background technique [0002] With the development of society and economy, as the necessary material for the development and survival of all organisms on the earth, the world's fresh water resources have become very scarce. Therefore, the rational use of fresh water and energy has become one of the difficulties faced by the world in the new century. Seawater desalination technology is undoubtedly one of the important ways to solve the freshwater crisis. [0003] The commonly used desalination methods include distillation and membrane technology. Distillation is mainly based on multi-stage flash evaporation and multi-effect flash evaporation, but it consumes a lot of energy and desalination costs are high. Reverse osmosis and electrodialysis ...

AI Technical Summary

Problems solved by technology

Distillation is mainly based on multi-stage flash evaporation and multi-effect flash evaporation, but it consumes a lot of energy and desalination costs are high

Reverse osmosis and electrodialysis membrane seawater desalination technologies also have outstanding problems such as high energy consumption, high cost of membrane processing and use, and complex desalination processes.

At the same time, the ordinary heat pump desalination device only uses the heat on the condenser side, but ignores the cooling capacity on the evaporator side.

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