Method for desalinating sea water by using seawater source heat pump technology

Abstract

The invention discloses a desalinating technique of seawater through water source heat pump under negative pressure condition, wherein the system is composed of seawater source heat pump, jet vacuum pump, generator and pump; a lower pressure condition is formed in the generator to evaporate the seawater with temperature elevated; the steam is leaded into next generator acted by jet vacuum pump to release potential heat and evaporate seawater, which realizes the utilization effectively; the steam condensate is extracted from the generator to product fresh water. The invention improves the energy utilizing efficiency as heat supplying equipment in winter, which releases the heat pollution of circulating condensate of electric factory due to low temperature of outlet water of seawater source heat pump evaporator and system generator.

Description

Technical field [0001] The present invention adopts the circulating cooling water of the power plant as the raw material and heat source for desalination of seawater, and uses the seawater source heat pump technology to extract heat from the circulating cooling water of the power plant in the non-heating season (in the heating season, it can provide heating for buildings). Heat, the method of low-temperature multi-effect seawater distillation after raising the temperature of part of the initial state of the circulating cooling water of the power plant. Background technique [0002] With the rapid and steady development of our country's national economy, the shortage of fresh water resources in China has become a serious situation, and the problem of shortage of fresh water resources has become a restrictive factor for the rapid economic development of many coastal areas. [0003] At present, the government has started vigorously developing seawater desalination projects in c...

AI Technical Summary

Problems solved by technology

[0007] 1. The latent heat of the steam obtained by evaporation is not effectively utilized, and the steam can be used as the next effective seawater evaporation heat source

[0008] 2. The temperature of the desalinated seawater is not heated by the heat of the waste heat of the ship. There will be insufficient heat supplement for low-temperature seawater. Changes in the ambient temperature will make the system unstable and even cause a serious drop in system output

[0009] 3. Surface evaporation is adopted, and the physical characteristics of water boiling at low pressure are not used, so the compensation heat of the heat pump cannot be fully utilized.

Slow evaporation and low freshwater production

[0010] 4. The heat utilization rate in the system is low, the cycle period is short, and the power consumption of the heat pump is large

[0011] Based on the above reasons, the overall efficiency of the seawater desalination plant is not high

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