A novel cryogenic air separation process based on self-heat recuperation

Yasuki Kansha, Akira Kishimoto, Tsuguhiko Nakagawa, Atsushi Tsutsumi

Research output: Contribution to journalArticle

65 Citations (Scopus)

Abstract

In this paper, a novel cryogenic air separation process that reduces energy consumption by self-heat recuperation is proposed. In the proposed cryogenic air separation process, heat from the top vapor stream of the column is recuperated and exchanged with heat in the bottom liquid and feed streams, using self-heat recuperation technology. As a result, not only the latent heat but also the sensible heat of the process stream is circulated in the process. Furthermore, the pressure in the column can be decreased compared with the high pressure part of a conventional cryogenic air separation system, in which high and low pressure columns are combined to exchange nitrogen latent heat with oxygen latent heat. Thus, the energy input to the main compressor located before the column can be dramatically reduced. A simulation demonstrated that the energy consumption of the proposed cryogenic air separation process with self-heat recuperation decreased by more than 36% compared with the conventional cryogenic air separation process, when producing 99.99 mol% oxygen from air.

Original languageEnglish
Pages (from-to)389-396
Number of pages8
JournalSeparation and Purification Technology
Volume77
Issue number3
DOIs
Publication statusPublished - Mar 4 2011
Externally publishedYes

Fingerprint

Cryogenics
Latent heat
Air
Energy utilization
Oxygen
Compressors
Hot Temperature
Nitrogen
Vapors
Liquids

Keywords

  • Cryogenic air separation
  • Energy
  • Exergy
  • Gas separation
  • Self-heat recuperation

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

Cite this

A novel cryogenic air separation process based on self-heat recuperation. / Kansha, Yasuki; Kishimoto, Akira; Nakagawa, Tsuguhiko; Tsutsumi, Atsushi.

In: Separation and Purification Technology, Vol. 77, No. 3, 04.03.2011, p. 389-396.

Research output: Contribution to journalArticle

Kansha, Yasuki ; Kishimoto, Akira ; Nakagawa, Tsuguhiko ; Tsutsumi, Atsushi. / A novel cryogenic air separation process based on self-heat recuperation. In: Separation and Purification Technology. 2011 ; Vol. 77, No. 3. pp. 389-396.
@article{155e4d770c184ac69e316bb91b17519a,
title = "A novel cryogenic air separation process based on self-heat recuperation",
abstract = "In this paper, a novel cryogenic air separation process that reduces energy consumption by self-heat recuperation is proposed. In the proposed cryogenic air separation process, heat from the top vapor stream of the column is recuperated and exchanged with heat in the bottom liquid and feed streams, using self-heat recuperation technology. As a result, not only the latent heat but also the sensible heat of the process stream is circulated in the process. Furthermore, the pressure in the column can be decreased compared with the high pressure part of a conventional cryogenic air separation system, in which high and low pressure columns are combined to exchange nitrogen latent heat with oxygen latent heat. Thus, the energy input to the main compressor located before the column can be dramatically reduced. A simulation demonstrated that the energy consumption of the proposed cryogenic air separation process with self-heat recuperation decreased by more than 36{\%} compared with the conventional cryogenic air separation process, when producing 99.99 mol{\%} oxygen from air.",
keywords = "Cryogenic air separation, Energy, Exergy, Gas separation, Self-heat recuperation",
author = "Yasuki Kansha and Akira Kishimoto and Tsuguhiko Nakagawa and Atsushi Tsutsumi",
year = "2011",
month = "3",
day = "4",
doi = "10.1016/j.seppur.2011.01.012",
language = "English",
volume = "77",
pages = "389--396",
journal = "Separation and Purification Technology",
issn = "1383-5866",
publisher = "Elsevier",
number = "3",

}

TY - JOUR

T1 - A novel cryogenic air separation process based on self-heat recuperation

AU - Kansha, Yasuki

AU - Kishimoto, Akira

AU - Nakagawa, Tsuguhiko

AU - Tsutsumi, Atsushi

PY - 2011/3/4

Y1 - 2011/3/4

N2 - In this paper, a novel cryogenic air separation process that reduces energy consumption by self-heat recuperation is proposed. In the proposed cryogenic air separation process, heat from the top vapor stream of the column is recuperated and exchanged with heat in the bottom liquid and feed streams, using self-heat recuperation technology. As a result, not only the latent heat but also the sensible heat of the process stream is circulated in the process. Furthermore, the pressure in the column can be decreased compared with the high pressure part of a conventional cryogenic air separation system, in which high and low pressure columns are combined to exchange nitrogen latent heat with oxygen latent heat. Thus, the energy input to the main compressor located before the column can be dramatically reduced. A simulation demonstrated that the energy consumption of the proposed cryogenic air separation process with self-heat recuperation decreased by more than 36% compared with the conventional cryogenic air separation process, when producing 99.99 mol% oxygen from air.

AB - In this paper, a novel cryogenic air separation process that reduces energy consumption by self-heat recuperation is proposed. In the proposed cryogenic air separation process, heat from the top vapor stream of the column is recuperated and exchanged with heat in the bottom liquid and feed streams, using self-heat recuperation technology. As a result, not only the latent heat but also the sensible heat of the process stream is circulated in the process. Furthermore, the pressure in the column can be decreased compared with the high pressure part of a conventional cryogenic air separation system, in which high and low pressure columns are combined to exchange nitrogen latent heat with oxygen latent heat. Thus, the energy input to the main compressor located before the column can be dramatically reduced. A simulation demonstrated that the energy consumption of the proposed cryogenic air separation process with self-heat recuperation decreased by more than 36% compared with the conventional cryogenic air separation process, when producing 99.99 mol% oxygen from air.

KW - Cryogenic air separation

KW - Energy

KW - Exergy

KW - Gas separation

KW - Self-heat recuperation

UR - http://www.scopus.com/inward/record.url?scp=79951640913&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79951640913&partnerID=8YFLogxK

U2 - 10.1016/j.seppur.2011.01.012

DO - 10.1016/j.seppur.2011.01.012

M3 - Article

AN - SCOPUS:79951640913

VL - 77

SP - 389

EP - 396

JO - Separation and Purification Technology

JF - Separation and Purification Technology

SN - 1383-5866

IS - 3

ER -