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Desalting method with phase change for indirectly freeze seawater by using of liquefied natural gas refrigeration capacity

A liquefied natural gas, indirect technology, applied in the field of refrigeration and low temperature, can solve the problem of high energy consumption and achieve the effect of reducing energy consumption

Inactive Publication Date: 2010-01-13
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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  • Desalting method with phase change for indirectly freeze seawater by using of liquefied natural gas refrigeration capacity

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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] like figure 1 Shown, the inventive method comprises the following steps:

[0017] 1. The liquefied natural gas exchanges heat with the gas-phase secondary refrigerant R410A in the first heat exchanger 1, so that the temperature of the secondary refrigerant decreases and undergoes a gas-liquid phase transition to condense. Among them, the secondary refrigerant R410A is in the first heat exchanger 1 The inlet state parameters are -25°C, 0.33MPa, the outlet state parameters are -32°C, 0.28MPa, and the first heat exchanger 1 adopts a plate-fin low-temperature heat exchanger;

[0018] 2. The secondary refrigerant R410A after cooling and liquefaction 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 s...

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Abstract

The invention relates to a desalting method with phase change for indirectly freeze seawater by using liquefied natural gas refrigeration capacity, belonging to the technical field of refrigeration and low-temperature engineering. The liquefied natural gas exchanges heat with a secondary refrigerant in a heat exchanger firstly, the liquefied natural gas absorbs the heat to lead the temperature of the secondary refrigerant to reduce and generate gas-liquid phase change, then the secondary refrigerant enters a crystallizer and indirectly exchanges heat with seawater so as to lead seawater to be frozen to ice on a heat exchanging surface, and simultaneously the secondary refrigerant absorbs heat to be gasified. The prepared ice enters a water tank and melts into fresh water. The recovered liquefied natural gas contains large amount of refrigeration capacity, does not need a high-energy consumption refrigerating unit, and can effectively reduce the energy consumption of a desalting device for indirectly freezing seawater.

Description

Technical field [0001] The invention relates to a frozen seawater desalination method, in particular to an indirect frozen seawater desalination method with phase change utilizing the cooling capacity of liquefied natural gas, and belongs 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 f...

Claims

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Application Information

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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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