Device and method for desalting seawater by using cold energy of liquefied natural gas

A technology of liquefied natural gas and cold energy, which is applied in household refrigeration equipment, seawater treatment, frozen water/sewage treatment, etc., can solve the problems of cumbersome post-treatment process, secondary refrigerant pollution, and poor desalination effect of freshwater products, etc. Simple treatment, less equipment corrosion, and light scaling

Inactive Publication Date: 2010-08-04
ZHEJIANG UNIV
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Problems solved by technology

However, the freshwater products of this method still face problems such as poor desalination effe

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  • Device and method for desalting seawater by using cold energy of liquefied natural gas
  • Device and method for desalting seawater by using cold energy of liquefied natural gas

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Embodiment Construction

[0013] As shown in the figure, the device for desalination of seawater using the cold energy of liquefied natural gas includes a first valve 1, a second valve 2, a third valve 3, a fourth valve 4, a fifth valve 5, a sixth valve 6, and a seventh valve 7 , eighth valve 8, ninth valve 9, tenth valve 10, eleventh valve 11, twelfth valve 12, thirteenth valve 13, fourteenth valve 14, fifteenth valve 15, sixteenth valve 16. The seventeenth valve 17, the eighteenth valve 18, the nineteenth valve 19, the raw sea water pump 20, the filter 21, the degassing tower 22, the vacuum pump 23, the first pressure gauge 24, the second pressure gauge 25, the first First crystallizer 26, second crystallizer 27, product fresh water pump 28, spray pipe 29, vaporizer 30, concentrated sea water pump 31; raw material sea water pump 20 and first valve 1, filter 21, degassing tower 22, third The valve 3, the first crystallizer 26, the sixteenth valve 16, and the spray pipe 29 are connected in sequence; th...

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Abstract

The invention discloses a device and a method for desalting seawater by using cold energy of liquefied natural gas. The method promotes the seawater to gasify and solid in a crystallizer by using the balance pressure difference of vapor between a low temperature and room temperature so that the aim of desalting the seawater by using the cold energy of the liquefied natural gas is fulfilled. The device mainly comprises a water pump, a filter, a degassing tower, a vaporizer, the crystallizer and the vacuum pump. The device and the method are mainly characterized in that: the cold energy recovery of the liquefied natural gas and the seawater desalination are combined and the seawater is gasified at a temperature a little lower than the room temperature by using the low-temperature cold energy of the liquefied natural gas so as to realize the seawater desalination. The device and the method overcome the defects of the difficult ice crystal washing and separation and poor desalination effect and the like of the traditional refrigerated seawater desalination method and have the advantages that: the cold energy of the natural gas is rationally utilized, the cost is low, the pollution is little, the raw water is simply preprocessed; and the concentration range is wide, the corrosion on equipment is less, the scale is little, no secondary coolant is required, the fresh water product can meet the state drinking standards by simple treatment and the like.

Description

technical field [0001] The invention relates to desalination of seawater, in particular to a device and method for desalination of seawater by utilizing the cold energy of liquefied natural gas. Background technique [0002] The shortage of fresh water resources has become a global problem. Faced with this problem, people turn their attention to the abundant sea water resources. It is very necessary to study economically feasible sea water desalination technology. Desalination is the process of separating seawater into a stream of usable low-salinity seawater) or fresh water) and a stream of high-concentration brine. [0003] At present, seawater desalination methods can be divided into distillation, reverse osmosis, freezing, electrodialysis and hydrate methods, among which the first two methods have been widely used in seawater desalination practice. application. The distillation method realizes seawater desalination through the vaporization process driven by a heat sour...

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Application Information

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IPC IPC(8): C02F1/22F25C1/00F25D3/10C02F103/08
CPCY02A20/124
Inventor 汤珂胡迪胡敏斐金滔
Owner ZHEJIANG UNIV
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