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Method for desalting seawater by utilizing cold energy of liquefied natural gas through phase transition-free indirect refrigeration

A technology of liquefied natural gas and no phase change, which is applied in the field of frozen seawater desalination and indirect frozen seawater desalination without phase change, which can solve the problem of high energy consumption and achieve the effect of reducing energy consumption

Inactive Publication Date: 2010-01-20
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

This process requires additional cooling capacity and high energy consumption

Method used

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  • Method for desalting seawater by utilizing cold energy of liquefied natural gas through phase transition-free indirect refrigeration

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Embodiment Construction

[0015] The specific implementation of the present invention using R410A as the secondary refrigerant 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 liquid-phase secondary refrigerant R410A in the first heat exchanger 1, and the secondary refrigerant R410A releases heat, and the temperature drops without phase change; among them, the secondary refrigerant R410A is in the first heat exchanger 1 The inlet state parameters are -15°C, 0.55MPa, the outlet state parameters are -35°C, 0.5MPa, and the first heat exchanger 1 adopts a plate-fin low-temperature heat exchanger;

[0018] 2. The cooled liquid-phase secondary refrigerant R410A enters the evaporation coil outside the crystallizer 3, and the raw seawater enters the inner side of the crystallizer 3 after being cooled by the second heat exchanger 2, and...

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Abstract

The invention relates to a method for desalting sea water by utilizing the cold energy of liquefied natural gas through phase transition-free indirect refrigeration, belonging to the technical field of refrigeration and cryogenic engineering. Firstly, heat exchange is carried out between the liquefied natural gas and liquefied secondary coolant in a heat exchanger, and the liquefied natural gas is gasified to absorb heat, thereby reducing the temperature of the secondary coolant while maintaining the phase thereof; secondly, the liquid phase secondary coolant enters a crystallizer and indirectly exchanges heat with seawater so as to refrigerate the seawater on the heat exchange surface into ice, and the secondary coolant absorbs heat to raise the temperature and is not gasified. The 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 an ice melting tank to be melted into fresh water. The invention 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.

Description

Technical field [0001] The invention relates to a frozen seawater desalination method, in particular to a non-phase change indirect frozen seawater desalination method utilizing the cold capacity of liquefied natural gas, belonging to the technical field of refrigeration and low temperature. 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 using this part of the cooling capacity generated by gasification to desalinate seawater in the form of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/22F25C1/14F25D3/10C02F103/08
CPCY02A20/124
Inventor 林文胜沈清清顾安忠
Owner SHANGHAI JIAO TONG UNIV
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