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Method for the production of liquefied natural gas and liquid nitrogen

a technology of liquid nitrogen and natural gas, applied in the direction of liquefaction, solidification, cold treatment separation, etc., can solve the problems of underutilization of nitrogen producing equipment, inability to operate or optimally operate compressors, and waste of potential refrigeration capacity, so as to achieve more efficient and flexible methods of producing lng, the effect of reducing costs

Inactive Publication Date: 2017-02-09
LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a cost-effective, efficient, and flexible method for producing LNG and LIN. It does not require significant energy input and can use the refrigeration capabilities of letdown of natural gas and nitrogen. The invention allows for varying production rates of LNG and / or LIN based on power costs, product demand, and supply levels. The invention can be utilized at an existing facility or location, reducing operating and capital costs compared to a situation without the benefit of the letdown process.

Problems solved by technology

As such, in these locations, potential refrigeration capacity is wasted.
Additionally, there are instances in which producers of the nitrogen gas feeding the pipeline do not operate at 100% of equipment design capacity, and therefore, large nitrogen compressors are either not operating or not operating at optimum capacity.
As such, the nitrogen producing equipment may be designed to be underutilized during many operating scenarios when other systems are not able to accommodate increased loads.

Method used

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  • Method for the production of liquefied natural gas and liquid nitrogen
  • Method for the production of liquefied natural gas and liquid nitrogen
  • Method for the production of liquefied natural gas and liquid nitrogen

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Embodiment Construction

[0102]While the invention will be described in connection with several embodiments, it will be understood that it is not intended to limit the invention to those embodiments. On the contrary, it is intended to cover all the alternatives, modifications and equivalence as may be included within the spirit and scope of the invention defined by the appended claims.

[0103]In one embodiment, the method can include integrating a natural gas letdown system with a nitrogen refrigeration cycle. In one embodiment, the nitrogen refrigeration cycle is a closed loop refrigeration cycle. In this embodiment, the natural gas letdown essentially provides “free” refrigeration energy since the natural gas would have been alternatively letdown across a valve (i.e., the resulting drop in temperature of the natural gas would have been absorbed by the surroundings and would not have been recovered in any meaningful way). With the addition of a natural gas turbine booster, LNG can be co-produced with a signi...

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Abstract

A method for the production of liquefied natural gas and liquid nitrogen is provided. The method may include providing a high pressure natural gas stream, splitting the high pressure natural gas stream into a first portion and a second portion, and liquefying the first portion of the high pressure natural gas stream to produce an LNG stream. The refrigeration needed for cooling and liquefaction of the natural gas and liquefaction of the nitrogen can be provided by a nitrogen refrigeration cycle and letdown of the second portion of the high pressure natural gas stream.

Description

RELATED APPLICATIONS[0001]This application claims priority to U.S. Provisional Application Ser. No. 62 / 201,947, filed on Aug. 6, 2015, U.S. Provisional Patent Application No. 62 / 305,381, filed on Mar. 8, 2016, and U.S. Provisional Application Ser. No. 62 / 370,953 filed on Aug. 4, 2016, all of which are hereby incorporated by reference in their entireties.TECHNICAL FIELD OF THE INVENTION[0002]The present invention generally relates to a method for efficiently producing liquefied natural gas (LNG).BACKGROUND OF THE INVENTION[0003]Many locations utilize a high pressure (transmission) network and a lower pressure (distribution) network to supply natural gas through a local area. The transmission network typically acts as a freeway to economically send the gas over long distances to the general area, while the distribution network acts as the roads to send the gas to the individual users within a local area. Pressures of these networks vary by location, but typical values are between 30-8...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F25J1/02F25J1/00
CPCF25J1/0208F25J2215/42F25J1/0015F25J1/0072F25J2230/22F25J2230/60F25J2205/02F25J2220/60F25J2220/68F25J2220/66F25J2220/02F25J2210/60F25J2270/42F25J2270/08F25J2245/02F25J2240/44F25J2240/40F25J2240/02F25J2210/06F25J1/0022F25J1/0007F25J1/001F25J1/0037F25J1/004F25J1/0045F25J1/005F25J1/0052F25J1/0202F25J1/0204F25J1/0224F25J1/0232F25J1/0236F25J1/0264F25J1/0271F25J1/0274F25J1/0281F25J1/0288F25J2210/02F25J2215/62F25J2215/64F25J2220/64F25J2230/20F25J2230/30F25J2270/14F25J2270/16F25J2290/34F25J1/0092F25J1/0238F25J1/0275F25J1/0292F25J3/0257F25J3/04412F25J2205/04F25J2210/40F25J2220/44F25J2230/42F25J2240/12F25J2245/42F25J2270/88F25J2290/12F25J2290/70
Inventor TURNEY, MICHAEL A.FARGES, ORIANEGUILLARD, ALAIN
Owner LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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