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Method for desalting seawater by utilizing cold energy of liquefied natural gas through direct contact refrigeration

A liquefied natural gas, direct technology, applied in the direction of chilled water/sewage treatment, seawater treatment, household refrigeration equipment, etc., can solve the problems of energy consumption, etc., achieve the effect of small loss in the heat exchange process, reduce energy consumption, and small device size

Inactive Publication Date: 2010-01-20
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, direct contact with frozen seawater desalination requires a refrigeration system to provide cooling capacity for the refrigerant, which consumes a lot of energy.

Method used

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  • Method for desalting seawater by utilizing cold energy of liquefied natural gas through direct contact refrigeration

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Embodiment Construction

[0015] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0016] Such as figure 1 Shown, the inventive method comprises the following steps:

[0017] 1. The liquefied natural gas exchanges heat with the water-insoluble secondary refrigerant in the first heat exchanger 1 to evaporate and gasify the liquefied natural gas. The temperature of the secondary refrigerant is lowered and condensed. The secondary refrigerant used is n-butane or isobutane alkyl;

[0018] 2. After condensation, the water-insoluble secondary refrigerant n-butane or isobutane is directly sprayed into a large amount of seawater in the crystallizer 3, the secondary refrigerant droplets evaporate and absorb heat, and the surrounding seawater releases heat and freezes into ice crystals;

[0019] 3. The gasified secondary refrigerant is extracted from the crystallizer 3, and the water vapor entrained in the gas-phase secondary r...

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Abstract

The invention relates to a method for desalting seawater by utilizing the cold energy of liquefied natural gas through direct contact refrigeration, belonging to the technical field of refrigeration and cryogenic engineering. Firstly, heat exchange is carried out between the liquefied natural gas and secondary coolant in a heat exchanger, the liquefied natural gas is gasified to absorb heat so as to condense the water-insoluble secondary coolant by reducing the temperature thereof, the condensed secondary coolant is sprayed into a crystallizer to exchange heat with seawater through direct contact, liquid drops of the secondary coolant is evaporated to absorb heat, and therefore seawater around the liquid drops releases heat and is refrigerated into ice crystals. Prepared ice is rinsed in a rinsing tank so as to eliminate salt attached to the surface of the ice and then is led into a melting device to be melted into fresh water. The process recovers a great amount of cold energy accumulated in the liquefied natural gas, dispenses with a high consumption refrigerating unit and can effectively reduce the energy consumption of indirect refrigeration seawater desalination device, the loss of the heat exchange process is low, and the size of the device is small.

Description

Technical field [0001] The invention relates to a frozen seawater desalination method, in particular to a direct contact frozen seawater desalination method which uses a water-insoluble secondary refrigerant to condense and directly passes into seawater and utilizes the cooling capacity of liquefied natural gas, and belongs to the technical field of refrigeration and cryogenic engineering . Background technique [0002] At present, the proportion of natural gas in my country's energy structure is increasing day by day, and several liquefied natural gas (LNG) receiving stations have been built or are under construction in the eastern coastal areas. In the process of entering the user's pipeline network, liquefied natural gas needs to be gasified into natural gas, and a large amount of cold energy will be released during the gasification process. In addition, since LNG receiving stations are mostly located in remote coastal areas, municipal water supply is inconvenient, so us...

Claims

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Application Information

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IPC IPC(8): C02F1/22F25C1/00F25D3/10C02F103/08
CPCY02A20/124
Inventor 林文胜沈清清顾安忠
Owner SHANGHAI JIAO TONG UNIV
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