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Improved cascade refrigeration process for liquefaction of natural gas

A natural refrigerant technology, applied in the field of natural gas liquefaction, can solve the problems of large investment and high operating costs

Inactive Publication Date: 2000-07-26
EXXONMOBIL UPSTREAM RES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gas processing equipment typically uses chemical and / or physical solvent regeneration methods requiring substantial capital investment
In addition, operating costs are high

Method used

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  • Improved cascade refrigeration process for liquefaction of natural gas
  • Improved cascade refrigeration process for liquefaction of natural gas
  • Improved cascade refrigeration process for liquefaction of natural gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0038] Material and energy balance simulations were carried out to illustrate the scenario shown in the figure and the results are presented in the table below.

[0039] Data were obtained using the commercially available process simulator HYSYS TM data obtained, however, can also be obtained using other commercially available process simulation programs, including HYSIM TM 、PROII TM and ASPENPLUS TM , are familiar to those skilled in the art. The data in Table 1 are used to better understand figure 1 shown, but the invention is not unnecessarily limited thereto. Temperature and flow rates should not be considered limiting of the invention. Many variations are possible from the techniques disclosed here. In this arrangement, the first refrigeration cycle 32 is a propane system and the second refrigeration cycle 33 is an ethylene system.

[0040] The data in Table 2 are used to better understand the scheme shown in Figure 2. In this arrangement, the first refrigeration ...

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PUM

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Abstract

This invention relates to a process for liquefying a pressurized gas stream (10) rich in methane with a heat exchanger being cooled by a cascade refrigeration system to produce a methane-rich liquid product (20) having a temperature above about -112 DEG C. (-170 DEG F.). In this process, a pressurized gas stream (10) is introduced into heat exchange contact with a first refrigerant cycle (32) comprising at least one refrigeration stage (30-31) whereby the gas stream is cooled against a first portion of a first refrigerant to produce a cooled gas stream. The cooled gas stream is then introduced into heat exchange contact with a second refrigerant cycle (33) comprising at least one refrigeration stage (37-39) whereby the temperature of the cooled gas stream is cooled to produce a liquefied methane-rich stream (20) having a temperature above about -112 DEG C. (-170 DEG F.) and a pressure sufficient for the liquefied stream to be at or below its bubble point.

Description

field of invention [0001] The invention relates to a natural gas liquefaction method, in particular to a method for producing pressurized liquid natural gas (PLNG). Background of the invention [0002] Natural gas has become widely used in recent years due to its clean burning properties and convenience. Many sources of natural gas are located in remote regions, long distances from industrial markets for the gas. Sometimes, pipelines are used to transport the produced natural gas to industrial markets. When pipeline transportation is not feasible, the produced natural gas is usually processed into liquefied natural gas (hereinafter referred to as "LNG") for delivery to the market. [0003] A distinguishing feature of LNG plants is the need for large equipment investments. The equipment used to liquefy natural gas is usually very expensive. A liquefaction plant is made up of several basic systems, including processing gas to remove impurities, liquefaction, refrigeration,...

Claims

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Application Information

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IPC IPC(8): F25J3/06B23K9/173B23K35/30B60K15/03C22C38/00C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16F17C1/00F17C1/14F17C3/00F17C3/02F17C7/00F17C7/02F17C13/00F17D1/08F25J1/02F25J5/00
CPCF17C7/02F17C2221/033F25J1/025C22C38/14C22C38/04F25J2205/50F17C2227/0337C22C38/001F25J2205/04F17C1/00F17C1/14F17C13/001C22C38/06F25J2290/62F17C1/002F17C2227/0355F25J1/02F25J1/0231F17C7/00F25J1/0022C22C38/08F25J1/0205B60K15/03006B23K9/173F25J2230/30F25J1/0254F25J2245/90F17C3/00F25J2220/64F25J1/0042F17C2223/0153F17D1/082C22C38/12F25J2230/60F17C3/025F25J2230/08C22C38/16F25J1/004B23K35/3066F25J3/06
Inventor E·T·科尔R·R·伯温
Owner EXXONMOBIL UPSTREAM RES CO
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