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Method for producing liquefied natural gas having an adjusted higher calorific power

A technology for liquefied natural gas and natural gas, applied in liquefaction, refrigeration and liquefaction, container filling methods, etc., can solve problems such as safety issues, achieve the effects of simplifying structure and operation, simplifying handling and transportation, and reducing investment and operating costs

Inactive Publication Date: 2012-10-31
TOTAL PUTEAUX FR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is particularly disadvantageous in the context of offshore mining, where equipment size is a key factor; moreover, the presence of large LPG stocks on offshore equipment raises safety concerns, especially due to the risk of explosion

Method used

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  • Method for producing liquefied natural gas having an adjusted higher calorific power
  • Method for producing liquefied natural gas having an adjusted higher calorific power
  • Method for producing liquefied natural gas having an adjusted higher calorific power

Examples

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Embodiment

[0133] The following examples illustrate the invention without limiting it.

[0134] The method of the invention is applied to natural gas (after deacidification, demercuration and dehydration) having the following composition:

[0135] - Nitrogen: 1%;

[0136] -C1: 87.6%;

[0137] -C2: 5.93%;

[0138] -C3: 1.80%;

[0139] -C4 (isobutane and n-butane): 0.87%;

[0140] -C5: 0.47%;

[0141] -C6+: 2.33%.

[0142] The condensate (C5+ molecules) and part of the LPG are extracted. In this way, light natural gas is obtained. The light natural gas is liquefied and stored as light LNG. Redirect part of the light LNG before flashing ( figure 1 11) and mix with propane and butane streams extracted from natural gas to make heavy LNG. Three possible scenarios can be envisioned:

[0143] - Heavy LNG is formed from about 90% light LNG and 10% LPG (hereinafter referred to as "10% heavy LNG");

[0144] - heavy LNG is formed from about 75% light LNG and 25% LPG (hereinafter "25% hea...

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Abstract

The invention relates to a method for treating natural gas containing propane and / or butane, including the following steps: extracting at least one portion of the propane and / or butane from the natural gas to provide a light natural gas; cooling and liquefying the light natural gas to provide a light liquefied natural gas; mixing a portion of the light liquefied natural gas with the extracted propane and / or butane to provide a heavy liquefied natural gas; the mixing step being performed in a liquefied natural gas production facility. The invention also relates to a liquefied natural gas production facility suitable for implementing said method.

Description

technical field [0001] The invention relates to a process for the production of liquefied natural gas in which the total calorific value can be adjusted according to the application. The invention also relates to equipment suitable for carrying out the method, as well as C-rich 3 -C 4 liquefied natural gas compositions of hydrocarbons. Background technique [0002] Natural gas is primarily used as fuel for boiler burners, gas turbines for power generation or simply for domestic cooking appliances. Equipment for all of these items must be able to burn gas safely and reliably. Therefore, it is critical that the combustion characteristics of the gas remain constant for long-term compatibility with the user's equipment. [0003] One of the sources of gas supply for consuming countries is liquefied natural gas (LNG) produced by liquefaction plants from natural gas from deposits. [0004] Among the gas properties on the market, the Gross Calorific Value (GCV) parameter is par...

Claims

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Application Information

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IPC IPC(8): C10L3/06C10L3/12F17C5/04F25J1/02C10L3/10
CPCF25J1/0255C10L3/12C10L3/102F25J1/0231F25J2290/62C10L3/06F25J1/0022F25J2220/64F25J1/0235F25J1/0278C10L3/10F25J2290/34F25J2220/62F25J2210/06F25J1/0237
Inventor 让・克洛德・加尔塞克里斯托夫・托马斯
Owner TOTAL PUTEAUX FR