Method and device for recycling gas

Inactive Publication Date: 2006-07-27
LINDE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0017] Advantageously one or more compression stages include multiple compressors connected in parallel because the compression performance of one stage is increased by the parallel switching. However, the com

Problems solved by technology

Since the gas is ultimately under atmospheric pressure in the balloon, the gas takes up a large volume and the filled balloon requires a great deal of space accordingly.
Since a single-stage compressor is unable to bridge such an enormous difference in pressure, a multistage compressor is used for this purpose.
The great energy loss which occurs due to the fact that the gas is depressurized in each quenching operation first from the high pressure of the c

Method used

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  • Method and device for recycling gas
  • Method and device for recycling gas
  • Method and device for recycling gas

Examples

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Embodiment Construction

[0022]FIG. 1 shows a high-pressure container 1, a quenching chamber 2 provided for a heat treatment, compressors 3, 4, cut-off elements 5, 6, 7, a switching unit 8 having a pressure sensor 9, lines 10, 11 and a gas supply 12. The workpieces are in the quenching chamber 2 for a quenching process. In the high-pressure container 1 which is filled with nitrogen, for example, a pressure p1 of 30 bar prevails. When the valve 5 is opened, gas suddenly flows out of the high-pressure container 1 into the quenching chamber 2. Then the pressure in the high-pressure container drops from 30 bar to 22 bar and the pressure in the quenching chamber rises to 20 bar. Then the cut-off element 5, which is designed as a valve like the other cut-off elements is closed. Now the cooling of the workpieces may be accomplished by means of the quenching gas which is carried in circulation. After cooling, the gas is recovered from the quenching chamber. To do so, first the valve 6 is opened while the valve 7 re...

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Abstract

A device and method for recycling of gas used during the quenching process in a thermal treatment, for example, in which the gas is removed directly from a quenching chamber and is compressed to the pressure prevailing in the high-pressure container rather than being decompressed into a gas buffer, an additional compression step being connected if the pressure inside the chamber lies below a threshold value, wherefore conduits comprising overflow regulators lead to the individual compression steps.

Description

[0001] This application claims the priority of German patent document 102 51 486.0, filed Nov. 5, 2002 (PCT International Application No. PCT / EP2003 / 012259, filed Nov. 3, 2003), the disclosure of which is expressly incorporated by reference hereinBACKGROUND AND SUMMARY OF THE INVENTION [0002] This invention relates to a method for recovering gas from a process that operates with gas under pressure. A gas sent from a high-pressure container to a closed chamber in which the process takes place is recovered by being compressed in multiple compression stages and fed back into the high-pressure container. [0003] Furthermore, this invention relates to a device for recovering gas from a process operating with gas under pressure, said process removing the gas from a high-pressure container and taking place in a closed chamber. [0004] Gases under pressure are needed for a variety of processes. Examples that can be given here include processes in heat treatment, special processes in thermal s...

Claims

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Application Information

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IPC IPC(8): E21B43/12C21D1/613C21D1/62
CPCC21D1/613C21D1/62C21D2241/01Y02P10/20
Inventor JURMANN, ALEXANDERRIEF, STEPHANFRYEN, HEIKO
Owner LINDE AG
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