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US 4,746,343 AGranted
Method and apparatus for gas separation
AssigneeHitachi, Ltd.
InventorsTakazumi Ishizu, Masahiro Yamazaki, Shozi Koyama, Kazunori Nagae, Junichi Hosokawa
Life of this patent
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Abstract
The invention discloses a method of gas separation which pressurizes part of a raw gas issuing from the outlet of an adsorbing tower by employing a compressor portion of an expander compressor, cools the pressurized gas by means of a main heat exchanger, and expands the cooled gas by means of an expansion turbine of the expander compressor, thereby efficiently carrying out gas separation with a simple arrangement.
Claims23
A method of gas separation comprising the steps of:
- after compressing a flow of raw gas and removing water and carbon dioxide therefrom, dividing the flow of compressed raw gas, having the water and carbon dioxide removed therefrom, into first and second flows at a stage before a main heat exchanger;
- supplying said first flow of gas to the warm-end side of said main heat exchanger so as to provide a cooled raw gas by means of a low temperature return gas;
- supplying said cooled raw gas to a gas separator section;
- supplying said second flow of gas to a compressor of an expander compressor so as to provide a pressurized gas;
- cooling said pressurized gas to a degree substantially equal to the warm-end temperature of said main heat exchanger, and thereafter supplying said pressurized gas to the warm-end side of said main heat exchanger;
- and supplying said pressurized gas cooled by said main heat exchanger to an expansion turbine of said expander compressor, thereby generating a cold.
3 more elements
An apparatus for separating gas comprising:
- a compressor for compressing a raw gas;
- and adsorbing tower for adsorbing and removing water and carbon dioxide contained in the compressed raw gas;
- a passage for dividing gas issuing from the outlet of said adsorbing tower, into first and second flows;
- a main heat exchanger;
- first conduit means for supplying said first flow of gas to the warm-end of the main heat exchanger;
- second conduit means for supplying a raw gas cooled by said main heat exchanger to a gas separator section;
- third conduit means for supplying said second flow of gas to a compressor of an expander compressor;
- fourth conduit means for supplying a pressurized gas issuing from the outlet of said compressor to the warm-end of said main heat exchanger;
- and fifth conduit means for supplying said pressurized gas to an expansion turbine of said expander compressor after said pressurized gas is cooled by said main heat exchanger.
6 more elements
An apparatus for separating gas comprising:
- a compressor for compressing a raw gas;
- an adsorber for adsorbing and removing water and carbon dioxide contained in the compressed raw gas;
- a compressor, of an expander compressor, for pressurizing part of the raw gas, the raw gas having been divided at an outlet of said adsorber into said part of the raw gas and a remaining part;
- an aftercooler for cooling pressurized gas issuing from an outlet of said compressor;
- a main heat exchanger for cooling the pressurized gas issuing from said aftercooler and for cooling the remaining part of the raw gas by a low temperature return gas from a gas separation section;
- and an expansion turbine, of said expander compressor, for expanding pressurized gas cooled by said main heat exchanger to generate a cold.
3 more elements
A method of gas separation comprising the steps of:
- dividing a flow of raw gas into first and second flows at a stage before a main heat exchanger;
- supplying said first flow of raw gas to the warm-end side of a main heat exchanger to cool said gas;
- supplying the cooled raw gas to a gas separation section;
- supplying said second flow of raw gas to a compressor to provide a pressurized gas;
- cooling said pressurized gas to a degree substantially equal to the warm-end temperature of said main heat exchanger and thereafter supplying it to the warm-end side of the main heat exchanger;
- supplying said pressurized gas cooled in said main heat exchanger to an expansion turbine to thereby generate a cold;
- and supplying a cold gas generated in said expansion turbine to said gas separation section.
4 more elements
A method of gas separation comprising the steps of:
- dividing a flow of raw gas into first and second flows;
- supplying said first flow of raw gas to the warm-end side of a main heat exchanger to cool said gas;
- supplying the cooled raw gas to a lower column of a rectifying separation section;
- supplying said second flow of raw gas to a compressor to provide a pressurized gas;
- cooling said pressurized gas to a degree substantially equal to the warm-end temperature of said main heat exchanger and thereafter supplying it to the warm-end side of the main heat exchanger;
- supplying said pressurized gas cooled in said main heat exchanger to an expansion turbine to thereby generate a cold;
- and supplying a cold gas generated in said expansion turbine to an upper column of said rectifying separation section.
4 more elements
Dependencies are inferred from the claim text.