Natural gas liquefaction system based on propane and iso-butane mixed pre-cooling

A technology of isobutane and natural gas, applied in the field of natural gas liquefaction system, can solve the problems of cumbersome process, high cost of liquefaction process, high energy consumption, etc., and achieve the effect of improving cooling efficiency, increasing energy exchange rate and reducing power consumption

Inactive Publication Date: 2020-10-30
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the liquefaction refrigeration cost of the small skid-mounted liquefaction process accounts for 42% of the total cost of the LNG project. The existing liquefaction process has high cost, high energ

Method used

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  • Natural gas liquefaction system based on propane and iso-butane mixed pre-cooling
  • Natural gas liquefaction system based on propane and iso-butane mixed pre-cooling
  • Natural gas liquefaction system based on propane and iso-butane mixed pre-cooling

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Embodiment

[0044] Such as Figure 1 to Figure 3 As shown, the mixed refrigerant liquefaction process using propane and isobutane mixed precooling,

[0045] The mixed precoolant output from the mixed precoolant compression skid enters the first heat exchanger 1, and the liquefied natural gas flows into the first heat exchanger 1 for precooling. The temperature after precooling is -35℃~-60℃, and the liquid The heavy hydrocarbon components are separated as LPG products, while the gaseous NG2 enters the second heat exchanger 2 and the third heat exchanger 3 for liquefaction and cooling, and the gas phase stream enters the second heat exchanger 2 to cool down to -100℃~-130℃ , the pressure of the stream NG5 flowing out of the first throttle valve is 200kPa, and the temperature is 113K. After being separated by the third gas-liquid separator 6, the liquid phase is LNG product, and the separated low-temperature gas phase BOG flows through the third heat exchanger 3. The second heat exchanger 2 ...

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Abstract

The invention discloses a natural gas liquefaction system based on propane and iso-butane mixed pre-cooling. A mixed refrigerant compression skid and a mixed precoolant compression skid are adopted tobe matched with a three-stage heat exchanger; by using the mixed refrigerant compression skid, natural gas to be liquefied is pre-liquefied and separated so that the separating efficiency of the natural gas to be liquefied is enhanced and the separating speed of the natural gas to be liquefied is increased; and then through precoolant cooling circulation of the mixed precoolant compression skid,a first heat exchanger, a second heat exchanger, a third heat exchanger and the mixed refrigerant compression skid, gas phase natural gas which is separated in the first stage is liquefied; by using the mixed precoolant compression skid to perform pre-cooling, the power loss of the mixed precoolant compression skid is reduced; through first-stage separation of liquid phase natural gas and by usinga mixed precoolant and a mixed refrigerant to exchange energy in the first heat exchanger, the second heat exchanger and the third heat exchanger, the structure is simple, the energy loss of the mixed refrigerant is reduced, the liquefaction efficiency is enhanced, and meanwhile, the liquefaction cost is reduced.

Description

technical field [0001] The invention belongs to a natural gas liquefaction process, in particular to a natural gas liquefaction system based on propane and isobutane mixed precooling. Background technique [0002] With the global demand for low-carbon emission reduction, natural gas, as a clean fossil fuel, is used in more and more fields. For many small natural gas fields, associated gas in oil fields, and coalbed methane, these natural gas resources are often scattered in remote areas. Although the reserves of these natural gas resources are small, the recovery of these scattered natural gas still has certain economic value. Small skid-mounted liquefaction processes liquefy natural gas into liquefied natural gas (LNG), which is then transported to large natural gas distribution centers using trucks. Since the skid-mounted liquefaction equipment is assembled from multiple working components, the liquefaction equipment can be transported to other gas fields by truck after ...

Claims

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Application Information

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IPC IPC(8): F25J1/00F25J1/02F25J5/00
CPCF25J1/0022F25J1/0279F25J5/00F25J1/0052F25J1/0055F25J1/0092F25J1/0214F25J2220/62F25J2220/64
Inventor 李云王旭岑高秀峰高洁
Owner XI AN JIAOTONG UNIV
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