Two-stage humidification heat pump sea water desalination device

Abstract

The invention discloses a two-stage humidification heat pump sea water desalination device, which comprises a compressor, a condenser, a throttle valve, an evaporator, an auxiliary heat exchanger, a hot sea water circulation pump, a cooling sea water circulation pump, a cooling sea water three-way regulating valve, a primary sea water sprayer, a primary humidifier, a primary thick sea water collector, a secondary sea water sprayer, a secondary humidifier, a secondary thick sea water collector, a primary precooler, a primary fresh water collector, a secondary precooler, a secondary fresh watercollector, a tertiary fresh water collector, a flow division three-way valve, a flow merging three-way valve and a centrifugal fan. The two stages of humidifiers are used for completing the heating humidification on the circulation air; the two stages of precoolers and evaporators are used for completing the condensation on wet ingredients in the circulation air and fresh water separation; the condensation potential heat is recovered and reutilized for completing the water supplementation on the system and the preheating humidification on the circulation air; the system heat recovery efficiency and water yield are improved; the equipment scale is simplified; the equipment scale formation trends are reduced; fresh water can be provided for different occasions.

Description

technical field [0001] The invention relates to the field of seawater desalination, in particular to a two-stage humidification heat pump seawater desalination device. Background technique [0002] China is a big ocean country, and the use of seawater desalination technology to produce fresh water is the most realistic choice to solve the serious shortage of fresh water resources in our country. At present, the traditional methods of seawater desalination are mainly distillation (including multi-stage flash evaporation, multi-effect evaporation, compressed air distillation, etc.) Further development. [0003] Compared with the traditional seawater desalination method, the humidification and dehumidification seawater desalination method is currently recognized as a heat treatment seawater desalination method with development potential. It has the advantages of low investment cost, simple structure, normal pressure operation, small scaling tendency, The advantages of mild va...

AI Technical Summary

Problems solved by technology

Although the device uses a water jet pump to maintain the vacuum of the evaporation chamber to improve the evaporation efficiency of seawater, direct contact spray evaporation still inevitably brings about serious fouling, and at the same time still faces the problem of increasing the evaporation temperature and reducing the Contradictions in condensing temperature, poor energy gradient utilization

Chinese patent CN105439232A discloses a heat pump seawater desalination device with cascade preheating and its control method, including an evaporative condenser, a fin evaporator, a rolling rotor compressor, an axial fan, a primary preheater and a secondary preheater. Heater and other components, although the device is equipped with a two-stage preheater, the fresh water temperature in the primary preheater is relatively low, and its latent heat of condensation is mainly absorbed by the evaporator, so the driving force for heat exchange with seawater raw materials is small

At the same time, the system also includes a set of pressure balance system, and the fouling problem of the evaporative condenser is relatively serious, the system structure is complicated, there are many components, and the operation for stable operation is relatively strict, so it is not suitable for small seawater desalination devices

Images