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Marine natural gas liquefaction and NGL recycling system and application

A recovery system and natural gas technology, applied in liquefaction, refrigeration and liquefaction, solidification, etc., can solve the problems of long construction period, flare ignition, high risk, etc., and achieve convenient start-up, shutdown and maintenance, compact equipment layout, and simplified equipment Effect

Inactive Publication Date: 2015-09-23
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] On the other hand, there are a large number of marginal gas fields, associated gas fields, and deep-sea gas fields with small production and reserves in my country. The single well reserves are small, and the distance from the gas supply pipeline network is far away. The pipeline transportation method has not been effectively developed due to unreasonable economics. Utilized, has long been flared to vent
Conventional offshore natural gas development, including the construction of offshore platforms, the laying of submarine natural gas pipelines, the construction of onshore natural gas liquefaction plants, and the construction of infrastructure such as roads and LNG export ports, requires large investment, long construction period, late cash recovery, and high risks

Method used

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  • Marine natural gas liquefaction and NGL recycling system and application
  • Marine natural gas liquefaction and NGL recycling system and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Natural gas molar composition 1.54% N 2 , 86.39%CH 4 , 6.47%C 2 h 6 , 2.87%C 3 h 8 , 0.72% i-C 4 h 10 , 0.82% n-C 4 h 10 , 0.41% i-C 5 h 12 , 0.31% n-C 5 h 12 , 0.31% n-C 6 h 14 , 0.16% C7+, pressure 4.9MPa, temperature 35°C, flow 1.512*10 4 kgmol / h, the specific steps of the skid-mounted nitrogen expansion natural gas liquefaction and NGL recovery process are as follows:

[0057] 1. Raw natural gas enters the demethanizer 1 for rectification, and heavy hydrocarbons are obtained from the bottom with a temperature of 84.95°C and a pressure of 4.9MPa, and natural gas is obtained from the top with a temperature of -78.24°C and a pressure of 4.89MPa;

[0058] 2. The heavy hydrocarbons obtained in step 1 enter the TDWC synthesis tower 2 for rectification, and obtain C from the bottom 5+ , the temperature is 166.7°C, the pressure is 2.11MPa, and the top end gets C 1 、C 2 、C 3 , the temperature is 6.142℃, the pressure is 2.725MPa, and the other end gets C 3...

Embodiment 2

[0068] Example 2 (for the associated gas source of an offshore oilfield in the South my country Sea):

[0069] Natural gas molar composition 1.1% N 2 , 90.9%CH 4 , 4.2%C 2 h 6 , 1.6%C 3 h 8 , 0.4% i-C 4 h 10 , 0.4% n-C 4 h 10 , 0.2% i-C 5 h 12 , 0.1% n-C 5 h 12 , 0.2% n-C 6 h 14 , 0.9%C 7+ , pressure 5MPa, temperature 40°C, flow rate 20*10 4 N m 3 / d, the specific steps of the skid-mounted nitrogen expansion natural gas liquefaction and NGL recovery process are as follows:

[0070] 1. Raw natural gas enters the demethanizer 1 for rectification, and heavy hydrocarbons are obtained from the bottom with a temperature of 136.8°C and a pressure of 4.9MPa, and natural gas is obtained from the top with a temperature of -74.73°C and a pressure of 4.89MPa;

[0071] 2. The heavy hydrocarbons obtained in step 1 enter the TDWC synthesis tower 2 for rectification, and obtain C from the bottom 5+ , the temperature is 195.3°C, the pressure is 2.11MPa, and the top end get...

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Abstract

The invention provides a marine LNGFPSO natural gas liquefaction and NGL recycling system. The system comprises an NGL fractionation module used for recycling natural gas condensate, a natural gas liquefaction module used for liquefying and supercooling natural gas, a CO2 transcritical circular precooling module and a nitrogen expansion refrigerating circulation module used for providing the cooling capacity for liquefying and supercooling natural gas. Compared with the prior art, the marine LNGFPSO natural gas liquefaction and NGL recycling system has the advantages that according to a marine LNG-FPSO prizing type nitrogen expansion natural gas liquefaction and NGL recycling technology, the process is simplified under the premise that the unit liquefaction energy consumption is low, and the process has the advantages that starting is fast, starting, shutting down and maintaining are convenient, equipment arrangement is compact, and prizing is convenient.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering and cryogenic engineering, and in particular relates to a skid-mounted nitrogen expansion natural gas liquefaction and NGL recovery system and method suitable for offshore LNG-FPSO. Background technique [0002] As the main fossil energy in the world, natural gas, oil and coal account for a large proportion of primary energy. Natural gas is a high-quality clean energy, and more and more countries have begun to pay attention to the development and utilization of natural gas resources. [0003] With the continuous optimization of my country's energy structure and the continuous growth of natural gas consumption demand, coupled with the current situation that most of my country's natural gas fields are not large, the gap between my country's natural gas supply and demand is constantly increasing. It is predicted that by 2020 my country's natural gas supply gap will reach 1000×10 8 m 3...

Claims

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Application Information

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IPC IPC(8): F25J1/02
CPCF25J1/0022F25J1/004F25J1/005F25J1/0072F25J1/0095F25J1/0204F25J1/0205F25J1/0267F25J1/0268F25J1/0278F25J1/0281F25J1/0288F25J3/0209F25J3/0233F25J3/0238F25J3/0242F25J2200/96F25J2220/62F25J2220/64F25J2230/20F25J2270/14F25J2270/16F25J2270/80
Inventor 巨永林陈卓
Owner SHANGHAI JIAO TONG UNIV
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