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Dual mixed refrigerant system

Inactive Publication Date: 2016-03-03
BLACK & VEATCH HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a process and system for liquefying a hydrocarbon-containing gas. The process involves cooling the gas in two stages using a mixed refrigerant, and then expanding it using a turboexpander. The expanded gas is then separated into an overhead vapor fraction and a liquid bottom fraction. The system includes a compressor that is driven by the turboexpander. The technical effect of this patent is to provide a more efficient and effective process for liquefying hydrocarbon-containing gases.

Problems solved by technology

The transportation of natural gas as a vapor requires prohibitively large tanker volumes; therefore, the natural gas is customarily liquefied for storage and transportation.
Unfortunately, the single mixed refrigerant processes require somewhat more power than the cascade systems.
However, cascade systems still suffer from operating inefficiencies.

Method used

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Embodiment Construction

[0019]The following detailed description of embodiments of the invention references the accompanying drawings. The embodiments are intended to describe various aspects of the invention in sufficient detail to enable those skilled in the art to practice the invention. Other embodiments can be utilized and changes can be made without departing from the scope of the claims. The following detailed description is, therefore, not to be taken in a limiting sense. The scope of the present invention is defined only by the appended claims, along with the full scope of equivalents to which such claims are entitled.

[0020]The present invention is generally related to processes and systems for liquefying a hydrocarbon-containing gas to thereby form an LNG stream comprising methane. As described below, these processes and systems can utilize a dual mixed refrigerant system to assist in the liquefaction of methane from the hydrocarbon-containing gases. Various embodiments of the dual mixed refriger...

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Abstract

Processes and systems are provided for recovering a liquefied natural gas (LNG) stream from a hydrocarbon-containing feed gas stream using dual closed-loop mixed refrigerant cycles. In particular, the processes and systems described herein can be used to efficiently and effectively liquefy methane from a hydrocarbon-containing feed gas stream by utilizing a first refrigeration system and a second refrigeration system in fluid communication with a turboexpander and separator.

Description

BACKGROUND[0001]1. Field of the Invention[0002]The present invention is generally related to processes and systems for recovering a liquefied natural gas (“LNG”) from a hydrocarbon-containing gas. More particularly, the present invention is generally related to processes and systems that comprise a dual mixed refrigerant system.[0003]2. Description of the Related Art[0004]In recent years, the demand for natural gas has increased. In many instances, natural gas is found in areas that are remotely located from the markets for the natural gas. Unless the natural gas is located sufficiently close to a market place so that it is feasible to construct a pipeline to transport the natural gas, it must be transported by tankers or the like. The transportation of natural gas as a vapor requires prohibitively large tanker volumes; therefore, the natural gas is customarily liquefied for storage and transportation. The use of liquefied natural gas and methods for its storage are well known. Natu...

Claims

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Application Information

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IPC IPC(8): F25J1/00
CPCF25J1/0022F25J1/0035F25J1/0042F25J1/0052F25J1/0057F25J1/0214F25J1/0238F25J1/0288F25J1/0292F25J2220/64F25J2230/08F25J2230/30F25J2230/20
Inventor SEITTER, JENNIFER, LAURENMILLER, TYSON, DOUGLASMILLER, DAVID, DOUGLAS
Owner BLACK & VEATCH HLDG
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