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Closed cycle mixed refrigerant systems

a technology of closed cycle and mixed refrigerant, applied in refrigeration machines, lighting and heating apparatus, solidification, etc., can solve the problems of affecting the power consumption of natural gas liquefaction, and achieve the effect of improving liquefaction efficiency

Inactive Publication Date: 2009-03-19
LINDE NORTHA AMERICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]The present invention provides for a method of controlling the liquid inventory in a closed loop refrigeration system in order to increase the quantity or relative percentage of the heavy component, iso-pentane, which is a liquid at ambient conditions (all other components are vapor), in the refrigerant mixture so that the warm end heat exchange in the refrigeration system heat exchanger is optimized. This will improve liquefaction efficiency.

Problems solved by technology

When the cooling efficiency of a system is affected, the power consumption for the liquefaction of natural gas will also be affected.

Method used

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  • Closed cycle mixed refrigerant systems
  • Closed cycle mixed refrigerant systems
  • Closed cycle mixed refrigerant systems

Examples

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Embodiment Construction

[0041]FIG. 2 shows a mixed refrigerant system employing the methods of the present invention. In this system, both warm 30 and cold end 35 phase separators are present. There are different refrigerant compositions in each of the phase separators and at the bottom of the main heat exchanger upstream of the Joule-Thompson valve.

[0042]For purposes of FIGS. 2, 3, 4 and 5, common components compressor, evaporative cooler, main heat exchanger, natural gas feed and liquefied product recovery have been designated with the same numbers throughout.

[0043]By changing the relative liquid holdup in the separators and the heat exchanger backup, the refrigerant composition in the loop can be adjusted. The liquid level in the warm end separator is continuously controlled online in order to regulate the iso-pentane in the five-component refrigerant mixture depending on various input conditions. If a higher level of warm end heat transfer is required in the main heat exchanger, a higher amount of high...

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Abstract

The present invention provides for a process for providing cooling and controlling the refrigeration in a cooling loop used in the production of liquefied natural gas. A cooling loop in contact with a heat exchanger contains a refrigerant composition and by controlling the amount of a component in the refrigerant composition, the necessary level of cooling provided to the heat exchanger can be maintained.

Description

[0001]This application claims priority from U.S. Provisional Patent Application Ser. No. 60 / 919,998 filed Mar. 26, 2007.BACKGROUND OF THE INVENTION[0002]The present invention provides for a method to continuously monitor and control the refrigerant composition in a closed cycle mixed refrigerant system.[0003]Liquefied natural gas (LNG) is produced by both small scale and large scale plants. The overall heating value of the LNG can be affected by the percentage of heavier hydrocarbon components found in the natural gas and hence, heavier hydrocarbons may need be removed prior to liquefaction. Some natural gases will also require removal of the heavy ends to prevent operating problems in the liquefaction cycle[0004]U.S. Pat. No. 6,530,240 B1 teaches a method for controlling a mixed refrigerant based, natural gas liquefier system that utilizes an exchange of system refrigerant between the system and an external storage tank whereby the use of extremely high pressures in the compressor ...

Claims

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Application Information

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IPC IPC(8): F25J1/00
CPCF25B9/006F25J2290/32F25J1/0022F25J1/0055F25J1/0092F25J1/0212F25J1/0221F25J1/0245F25J1/0249F25J1/0262F25J1/0268F25J1/0291F25J2210/06F25J2210/42F25J2220/64F25B2400/23F25J1/0052
Inventor POTTHOFF, RICHARDKRISHNAMURTHY, RAMACHANDRANSETHNA, RUSTAM H.
Owner LINDE NORTHA AMERICA
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