Thermal membrane coupling seawater desalination system by using industrial waste heat

Abstract

The invention discloses a thermal membrane coupling seawater desalination system by using industrial waste heat. The system comprises an industrial waste heat utilization unit, a heat-method seawaterdesalination unit, and a membrane-method seawater desalination unit. The system has the advantages that gaseous-state or liquid-state industrial waste heat is used, the system provides heat energy forthe heat-method seawater desalination unit, and fossil fuel consumption and carbon dioxide discharge are reduced; after one-time utilization, industrial waste heat still has certain heat, partial inlet water desalinated from seawater through a membrane method is pre-heated, and waste heat discharge is reduced; preheated original seawater, the strong brine desalinated from the seawater through a heat method and cooling water are mixed as the inlet water desalinated from the seawater through the membrane method, the seawater utilization rate of an integral body of the system is increased, powerconsumption increase due to increase of salinity of the inlet water is reduced through high-temperature operation by the membrane method; under condition that first-level reverse osmosis producing water still contains certain salt content, secondary reverse osmosis is employed for further processing, and the high quality desalting water is formed by mixing producing water from the heat method andthe membrane method.

Description

technical field [0001] The invention relates to the technical field of car seats, in particular to a thermal film coupled seawater desalination system utilizing industrial waste heat, and particularly to its mechanical connection structure. Background technique [0002] With the trend of global warming becoming more and more obvious, the shortage of fresh water resources has become a key issue that threatens the survival and development of human beings, and seawater desalination is considered to be an important way to solve the global freshwater crisis in the future, but for now, seawater desalination is still an energy source. intensive industry. The large-scale and mature commercial multi-effect evaporation technology consumes a lot of heat energy, and the utilization rate of seawater in the process is extremely low, generally only 20% to 30%, and transporting a large amount of cooling seawater itself consumes a lot of electric energy. The reverse osmosis technology will ...

AI Technical Summary

Problems solved by technology

The large-scale and mature commercial multi-effect evaporation technology consumes a lot of heat energy, and the utilization rate of seawater in the process is extremely low, generally only 20% to 30%, and transporting a large amount of cooling seawater itself also consumes a lot of electric energy

The reverse osmosis technology will be affected by seawater temperature. Generally speaking, if the water temperature decreases by 1°C, the membrane flux will decrease by about 3%. When operating at low temperature, a large amount of additional electricity costs will be paid to maintain the water production.

Although a large number of scientists and engineers are currently exploring the use of renewable energy for desalination of seawater, such as wind energy, solar energy, geothermal energy, etc., due to the limitations of technology application scenarios and the shortcomings of the technology itself, the cost of fresh water is high. , for industrial applications, a large amount of additional cost is added, and it is unbearable for ordinary people in a large number of water-scarce areas

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