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Method for refrigerating liquefied natural gas by aid of single mixed working medium and device

A technology of liquefied natural gas and mixed working fluid, which is applied in the directions of refrigeration and liquefaction, liquefaction, cold treatment separation, etc. It can solve the problems of liquid accumulation at the bottom of the cold box, high energy consumption of the device, and poor adaptability to variable load operation, so as to avoid Effects of cold box effusion, power consumption reduction, and heat transfer curve matching

Active Publication Date: 2012-08-15
XINDI ENERGY ENG TECH +1
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AI Technical Summary

Problems solved by technology

The heat exchange process between the refrigerant and natural gas in the plate-fin heat exchanger is a first-stage heat exchange. The optimization of the heat exchange temperature difference between the streams is limited to a certain extent, and the energy consumption of the device is high. Moreover, this process is prone to produce the bottom of the cold box. Effusion, not very adaptable to variable load operation of the device

Method used

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  • Method for refrigerating liquefied natural gas by aid of single mixed working medium and device
  • Method for refrigerating liquefied natural gas by aid of single mixed working medium and device
  • Method for refrigerating liquefied natural gas by aid of single mixed working medium and device

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Embodiment Construction

[0042] Further explain below in conjunction with accompanying drawing:

[0043] Natural gas cycle:

[0044] Such as figure 2 As shown in , the purified raw natural gas first enters the plate-fin main heat exchanger group 8 for pre-cooling in the fifth heat exchange channel, and after being cooled to -30°C ~ -80°C, it enters the heavy hydrocarbon separator 6 for gas-liquid Separation, the gas phase stream separated from the top of the heavy hydrocarbon separator 6 continues to enter the remaining heat exchangers of the main heat exchanger group 8 (the sixth heat exchange channel), and is cooled to -130 ° C ~ -166 °C in it. °C, it is sent to the LNG storage tank 9 for storage, and the liquid phase at the bottom of the heavy hydrocarbon separator is liquefied petroleum gas (LPG).

[0045] Mixed refrigerant cycle:

[0046] From C1~C5 and N 2 The mixed working fluid is selected from C1, C2, C3, C4 and C5 paraffins and N 2 Four, five or six of them, they enter the inlet of the...

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Abstract

The invention relates to a method for refrigerating liquefied natural gas by the aid of a single mixed working medium and a device. The device comprises a mixed working medium compressor, a cooler, a gas and liquid separator, a throttling device, a plate-fin heat exchanger group and an LNG (liquefied natural gas) storage tank. In the technological process, mixed refrigerant is compressed and separated step by step, and gas compression power consumption is reduced. Heat exchange curves of cold fluid and hot fluid in a total heat exchange process match with each other better by the aid of multi-stage heat exchange, and flow of the mixed refrigerant is reduced effectively. In addition, the technological process is excellently adaptable to variable-load operation of the device, and liquid accumulation at the bottom of a refrigerating box can be avoided effectively.

Description

technical field [0001] The invention relates to the liquefaction production of gas rich in hydrocarbons, in particular to a method and device for refrigerating liquefied natural gas with a single mixed working medium. Background technique [0002] Due to its environmental protection, natural gas has become the best substance to replace other fuels, and its application fields have gradually expanded to power generation, automobile gas, industrial gas, urban residential gas, chemical gas, etc. [0003] With the growth of natural gas consumption, as one of the most efficient forms of supply and use of natural gas, the trade volume of liquefied natural gas has become one of the fastest growing areas of the energy market. The continuous development of the liquefied natural gas industry puts forward higher requirements on energy consumption, investment and efficiency of natural gas liquefaction methods and devices. [0004] At present, relatively mature natural gas liquefaction p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J1/02
CPCF25J1/0022F25J1/0055F25J1/0212F25J1/0291F25J2220/64
Inventor 何振勇王贵歧刘丽梅
Owner XINDI ENERGY ENG TECH
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