System for desalination of sea water by utilizing LNG cold energy

Abstract

The invention discloses a system for desalination of sea water by utilizing LNG cold energy, comprising a town water system and town gas supply system, an LNG loading and unloading and storage system, a hydrate sea water desalination system and a sea water extraction system; one end of the LNG loading and unloading and storage system is connected with the town gas supply system, the other end is connected with the hydrate sea water desalination system, the LNG loading and unloading and storage system is used for receiving and storing liquefied natural gas (LNG) transmitted from an LNG receiving end and transmitting the LNG into the hydrate sea water desalination system, and the LNG is gasified and then is transmitted to the town gas supply system; the other end of the hydrate sea water desalination system is also connected with the sea water extraction system, and hydrate sea water desalination system is used for decomposing the sea water extracted by the sea water extraction system into fresh water by virtue of combination reaction of hydrate and the LNG; and the town water system is also connected with the hydrate sea water desalination system and used for transmitting the fresh water obtained by decomposition of the hydrate sea water desalination system. The invention has the characteristics that: energy consumption is low, equipment is simple; solubility in water or saline water is low; LNG cold energy utilization factor is high, economic benefit is high, investment cost is low, and environmental effect is less.

Description

technical field [0001] The invention relates to the field of seawater desalination technology applied in the water treatment industry, in particular to a system for desalination of seawater by using LNG cold energy and hydrate technology. Background technique [0002] At present, the international community has listed food, energy and water as strategic resources related to national security. The sustainable use of water resources is an extremely important guarantee for sustainable economic and social development. my country is a country with abundant water resources, but also a country with poor per capita water resources. The total amount of water resources in the country is 28,124 trillion cubic meters, ranking sixth in the world, but the per capita water resources are only 2,220 cubic meters, which is 1 / 4 of the world average, and the distribution between the north and the south is extremely uneven. With the development of the economy and the improvement of people's li...

AI Technical Summary

Problems solved by technology

[0006] Since most of my country's LNG receiving stations are located along the coast, and the medium used for heating is usually seawater, in this way, the discharge of cold energy along with the seawater may lead to abnormal seawater temperature, which will have a certain impact on the marine ecological environment and marine transportation. Impact

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