FR2305707A1 - Control system for reversible flow heat exchanger banks - using mean temp. deviation in centre of each unit for control - Google Patents

Control system for reversible flow heat exchanger banks - using mean temp. deviation in centre of each unit for control

Info

Publication number
FR2305707A1
FR2305707A1 FR7608962A FR7608962A FR2305707A1 FR 2305707 A1 FR2305707 A1 FR 2305707A1 FR 7608962 A FR7608962 A FR 7608962A FR 7608962 A FR7608962 A FR 7608962A FR 2305707 A1 FR2305707 A1 FR 2305707A1
Authority
FR
France
Prior art keywords
temp
mean
deviation
calcd
control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR7608962A
Other languages
French (fr)
Other versions
FR2305707B1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to FR7608962A priority Critical patent/FR2305707A1/en
Publication of FR2305707A1 publication Critical patent/FR2305707A1/en
Priority to FR7730334A priority patent/FR2367266A2/en
Application granted granted Critical
Publication of FR2305707B1 publication Critical patent/FR2305707B1/fr
Granted legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J5/00—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

In the automatic balancing of the temps. of a large no. of heat exchange units with reversible flow which are arranged inpparallel to each other, each exchanger has a feed stream and >=1 heat transfer medium stream, these streams being interchanged at set time intervals. The temp. of the particular unit is measured as the feed stream and heat transfer medium are switched over; the mean temp. of the limit is measured over the previous time interval, which should be constant, is calcd. a mean temp. for all the limits based on the mean temp. of the individual units is then calcd; the deviation and the direction of deviation or a particular exchanger is then calcd. by comparing its mean temp with the overall mean; a correction is then applied to its flow control valve to balance its temp. w.r.t. the overall temp. of the system. Esp. for use in the sepn. of air into its components. Reversible flows are used to prevent the build up of solid H2O and CO2 on the surfaces of exchangers used as feed precoolers for the first dist. column, the crude gas streams and a recycle stream being used as coolants. The process avoids poor column control and off spec. prod.
FR7608962A 1976-03-26 1976-03-26 Control system for reversible flow heat exchanger banks - using mean temp. deviation in centre of each unit for control Granted FR2305707A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR7608962A FR2305707A1 (en) 1976-03-26 1976-03-26 Control system for reversible flow heat exchanger banks - using mean temp. deviation in centre of each unit for control
FR7730334A FR2367266A2 (en) 1976-03-26 1977-10-07 Temperature control system for air fractionating plant - has heat exchangers with shut=down feature ensuring continuation of all others

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7608962A FR2305707A1 (en) 1976-03-26 1976-03-26 Control system for reversible flow heat exchanger banks - using mean temp. deviation in centre of each unit for control

Publications (2)

Publication Number Publication Date
FR2305707A1 true FR2305707A1 (en) 1976-10-22
FR2305707B1 FR2305707B1 (en) 1979-04-20

Family

ID=9171042

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7608962A Granted FR2305707A1 (en) 1976-03-26 1976-03-26 Control system for reversible flow heat exchanger banks - using mean temp. deviation in centre of each unit for control

Country Status (1)

Country Link
FR (1) FR2305707A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0138016A2 (en) * 1983-09-21 1985-04-24 Hitachi, Ltd. Method and apparatus for the temperature balancing control of a plurality of heat exchangers
US4962809A (en) * 1989-04-21 1990-10-16 Rolls-Royce Plc Heat exchanger

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NEANT *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0138016A2 (en) * 1983-09-21 1985-04-24 Hitachi, Ltd. Method and apparatus for the temperature balancing control of a plurality of heat exchangers
EP0138016A3 (en) * 1983-09-21 1987-07-15 Hitachi, Ltd. Method and apparatus for the temperature ballancing control of a plurality of heat exchangers
US4962809A (en) * 1989-04-21 1990-10-16 Rolls-Royce Plc Heat exchanger

Also Published As

Publication number Publication date
FR2305707B1 (en) 1979-04-20

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Legal Events

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