Podcast
Questions and Answers
What is the purpose of reintroducing the cooled vapor into the feed stream in the LNG liquefaction process?
What is the purpose of reintroducing the cooled vapor into the feed stream in the LNG liquefaction process?
To help pre-cool the gas to a temperature between -7oC and 4oC
What are some of the hydrocarbons that make up the mixed refrigerant used in the LNG liquefaction process?
What are some of the hydrocarbons that make up the mixed refrigerant used in the LNG liquefaction process?
Methane, ethane, propane, butane, and pentane
What is the pressure range for the low-pressure cycle in the LNG liquefaction process?
What is the pressure range for the low-pressure cycle in the LNG liquefaction process?
100 to 150 psia
What is the capacity, in million tonnes per annum (MTPA), that the LNG liquefaction process is capable of handling?
What is the capacity, in million tonnes per annum (MTPA), that the LNG liquefaction process is capable of handling?
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What is the purpose of having two compressors in the LNG liquefaction setup?
What is the purpose of having two compressors in the LNG liquefaction setup?
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What is the pressure range for the high-pressure cycle in the LNG liquefaction process?
What is the pressure range for the high-pressure cycle in the LNG liquefaction process?
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What happens if one compressor fails in the LNG liquefaction setup?
What happens if one compressor fails in the LNG liquefaction setup?
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How can the LNG liquefaction process reduce downtime if equipment fails?
How can the LNG liquefaction process reduce downtime if equipment fails?
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What is the purpose of using raw natural gas in the pre-cooling stage of the LNG liquefaction process?
What is the purpose of using raw natural gas in the pre-cooling stage of the LNG liquefaction process?
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Why are higher rated compressors needed in the high-pressure cycle of the LNG liquefaction process?
Why are higher rated compressors needed in the high-pressure cycle of the LNG liquefaction process?
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Study Notes
Equipment Costs
- Increased capital, utility, and maintenance costs arise from diverse equipment types used in natural gas liquefaction processes.
BP Self Refrigerated Process
- Patented by BP Corporation in 2002 (US Pat. No: 6464578).
- Revolutionary for not using external refrigerant during liquefaction of natural gas (NG).
- NG stream undergoes flashing at low temperatures to create vapor and liquid phases.
- Cold vapor stream cools the NG stream, with the cycle repeated 4-5 times to reach required LNG temperature.
Mustang Engineering Smart Liquefaction Process
- Patented process (Patent No: 7225636) features simple design and compact equipment.
- Easily transportable and shutdown; designed for use on floating barges for offshore natural gas wells.
- Operates without external refrigerants by splitting the NG stream to cool itself.
- Advantage: Eliminates need for external refrigerant storage tanks.
- Disadvantage: Final liquefied natural gas yield is only a fraction of the input feed gas.
Technip-TEALARC Process
- Incorporates two refrigeration cycles along with a precooling stage.
- First cycle cools a mixed refrigerant stream containing methane, ethane, propane, and butane.
- Second cycle utilizes the mixed refrigerant from the first to cool the natural gas.
- The mixed refrigerant used includes methane, ethane, propane, n-butane, and nitrogen.
ExxonMobil Dual Multicomponent Process
- Patented in 1999 (US patent no.: 6,250,105).
- Designed similarly to DMR process, employing two mixed refrigerant cycles.
- Operates both cycles at high and low pressures, enhancing energy efficiency.
- High-pressure refrigeration cycle primarily cools the low-pressure refrigerant, optimizing energy usage across both cycles.
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Description
Learn about the BP Self Refrigerated Process patented by BP Corporation in 2002 for natural gas liquefaction. The process involves flashing NG stream at cold temperatures, utilizing the cold vapor stream to cool the natural gas stream, eliminating the need for external refrigerant.
