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Method and system for air separation using a supplemental refrigeration cycle

a technology of air separation and refrigeration cycle, which is applied in the direction of refrigeration, liquid product stream, lighting and heating apparatus, etc., can solve the problems of achieve the effect of increasing reducing the production of liquid product stream

Inactive Publication Date: 2016-06-02
PRAXAIR TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Enables precise control of liquid product production in air separation plants by maintaining constant volumetric flow and pressure ratios, enhancing the efficiency and reliability of the refrigeration cycle across varying operating conditions.

Problems solved by technology

Removing the working fluid from the supplemental refrigeration circuit upstream of a turboexpander section decreases the refrigeration imparted by the supplemental refrigeration circuit to the main heat exchanger and the air separation plant and thus decreases the production of the liquid product stream.

Method used

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  • Method and system for air separation using a supplemental refrigeration cycle
  • Method and system for air separation using a supplemental refrigeration cycle

Examples

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Embodiment Construction

[0017]With reference to FIG. 1, a cryogenic air separation plant 1 is illustrated that is integrated with a supplemental refrigeration circuit or system 2 which is designed to increase production of liquid products from the air separation plant 1. This integration is accomplished with the use of a heat exchanger 3 that is provided with layers that allow subsidiary streams of pumped liquid oxygen to reach a temperature that exceeds either at the dew point or the critical temperature of the pumped liquid oxygen and then combine such subsidiary streams to leave regions of layers free for warming a refrigerant stream produced in the closed loop refrigeration cycle.

[0018]In the air separation plant 1, a feed air stream 10 is introduced into a cryogenic air separation plant 1 to separate oxygen from the nitrogen. Air stream 10 is preferably compressed within an intercooled, integral gear compressor 12 to a pressure that can be between about 5 bar(a) and about 15 bar(a). After compression,...

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PUM

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Abstract

A system and method for air separation using a supplemental refrigeration cycle is provided. A portion of the refrigeration required by the air separation plant to produce a liquid product stream is supplied via a supplemental refrigeration circuit configured to direct a cooled refrigerant produced by the turboexpander through the main heat exchanger of the air separation plant. The refrigeration capacity is controlled by removing or adding a portion of the refrigerant in the supplemental refrigeration circuit to adjust the inlet pressure while maintaining a substantially constant volumetric flow rate and substantially constant pressure ratio across the compressor. Removing the refrigerant from the supplemental refrigeration circuit decreases the refrigeration imparted by the supplemental refrigeration circuit and thus decreases the production of the liquid product stream. Adding refrigerant allows for an increase in the refrigeration imparted by the supplemental refrigeration circuit and thus allows for increased production of the liquid product stream.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]The present application is a divisional application from U.S. patent application Ser. No. 13 / 803,195 filed Mar. 14, 2013; which is a continuation-in-part application from U.S. patent application Ser. No. 12 / 485,235 filed Jun. 16, 2009, issued on Mar. 19, 2013 as U.S. Pat. No. 8,397,535; the disclosures of which are incorporated by reference herein.FIELD OF THE INVENTION[0002]The present invention relates to a method and system for air separation involving production of a liquid product stream by using a supplemental refrigeration cycle. More particularly, the present invention relates to a supplemental refrigeration cycle that circulates a refrigerant or working fluid at a substantially constant volumetric flow rate and also maintains the pressure ratio across the compressor section substantially constant by removing or adding the working fluid or refrigerant from or to the supplemental refrigeration circuit to adjust the liquid product m...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F25J3/04
CPCF25J3/04412F25J3/0409F25J3/04187F25J3/042F25J3/04278F25J3/04296F25J3/04812F25J2245/40F25J2270/14F25J2270/40F25J2270/902F25J1/0249F25J1/025F25J1/0251F25J1/0254F25J1/0255
Inventor RAUCH, JEREMIAH J.WARTA, ANDREW M.WUPARSNICK, DAVID R.DOWD, SOPHIA J.
Owner PRAXAIR TECH INC
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