Liquefied natural gas (LNG) cold energy-driving seawater desalination device and method with double functions of vaporization and freezing

A liquefied natural gas, double-acting technology, applied in chemical instruments and methods, chilled water/sewage treatment, seawater treatment, etc. The effect of good geo-bonding, improving energy efficiency and avoiding pollution problems

Active Publication Date: 2012-07-04
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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

Method used

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  • Liquefied natural gas (LNG) cold energy-driving seawater desalination device and method with double functions of vaporization and freezing
  • Liquefied natural gas (LNG) cold energy-driving seawater desalination device and method with double functions of vaporization and freezing

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Embodiment Construction

[0011] like figure 1As shown, a liquefied natural gas cold energy-driven vaporization and freezing double-acting seawater desalination device is characterized in that it 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, seventh valve 7, eighth valve 8, ninth valve 9, tenth valve 10, eleventh valve 11, twelfth valve 12, thirteenth valve 13, fourteenth valve 14, tenth Five valves 15, sixteenth valves 16, seventeenth valves 17, eighteenth valves 18, nineteenth valves 19, twentieth valves 20, twenty-first valves 21, twenty-second valves 22, second Thirteen valves 23, vacuum pump 24, raw seawater pump 25, high-purity freshwater pump 26, concentrated seawater pump 27, sea ice freshwater pump 28, ice slurry pump 29, first pressure gauge 30, second pressure gauge 31, first crystallization Device 32, second crystallizer 33, filter 34, degassing tower 35, first precooling heat exchanger 36, melter 37, washing separator 38, ...

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Abstract

The invention discloses a liquefied natural gas (LNG) cold energy-driving seawater desalination device and method with double functions of vaporization and freezing. The operating principle of the device is based on the characteristic that the phase equilibrium pressure of water vapor decreases along with the decrease of the temperature, the cold energy of LNG is utilized to realize low temperature and vacuum, the water vapor on the surface of the raw material seawater is pumped to promote the vaporization of seawater and the endothermal effect of the vaporization process is utilized to ensure that the raw material seawater is frozen, i.e., fresh water is separated from seawater through the two phase transition processes of vaporization and freezing. The device mainly comprises a water pump, a filter, a degassing tower, an air-precooled heat exchanger, a vaporization-crystallization device, a crystallizer, a scrubbing separator, a melting device, a vacuum pump and the like. The deviceis mainly characterized in that LNG cold energy driving is adopted, gas-liquid-solid separation is performed at the triple point of seawater, and high-quality fresh water and sea icy freshwater are obtained; and the device has the advantages of cold energy cascaded utilization, higher energy efficiency, higher fresh water yield and the like. In addition, an LNG receiving station is usually built by the sea and has good geopolitical combinability with a seawater desalination project.

Description

technical field [0001] The invention relates to seawater desalination, in particular to a double-action seawater desalination device and method of vaporization and freezing driven by cold energy of liquefied natural gas. Background technique [0002] Natural gas is the third largest energy after coal and oil in the world, and it has become an important part of my country's current energy strategy because of its clean and efficient characteristics. In order to facilitate ocean transportation, gaseous natural gas is usually liquefied into liquefied natural gas (LNG), which reduces its volume by about 600 times. About 850kWh of energy is consumed to produce one ton of LNG, and a considerable part of the energy is stored in LNG in the form of cold energy. This part of the cold energy is released during the process of vaporizing the liquefied natural gas into normal temperature gas for use by users. The process of endothermic vaporization is generally carried out in the liquefie...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F1/22C02F1/04C02F103/08
CPCY02A20/124
Inventor 汤珂包士然金滔李聪航刘姝娟
Owner ZHEJIANG UNIV
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