US3593779A - Heat exchanger for quenching thermally cracked gas - Google Patents

Heat exchanger for quenching thermally cracked gas Download PDF

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Publication number
US3593779A
US3593779A US852731A US3593779DA US3593779A US 3593779 A US3593779 A US 3593779A US 852731 A US852731 A US 852731A US 3593779D A US3593779D A US 3593779DA US 3593779 A US3593779 A US 3593779A
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United States
Prior art keywords
heat exchanger
gases
stage
thermally cracked
quenching
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Expired - Lifetime
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US852731A
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English (en)
Inventor
Ichiro Tokumitsu
Minoru Sugiyama
Souji Asano
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Idemitsu Petrochemical Co Ltd
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Idemitsu Petrochemical Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D51/00—Auxiliary pretreatment of gases or vapours to be cleaned
    • B01D51/10—Conditioning the gas to be cleaned
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G9/00—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
    • C10G9/002—Cooling of cracked gases

Definitions

  • PATENTEDJUL20IB7I HT EXCHANGER HT This invention relates to a method of, and an apparatus for quenching thermally cracked gas of hydrocarbons. More particularly it relates to a method of, and an apparatus for quenching thermally cracked gas of hydrocarbons in which heat exchangers are used in two stages; one heat exchanger is used in the first stage (upstream side) and two or more heat exchangers (downstream side) arranged in parallel and connected to the first stage heat exchanger, are used in the second stage, each of the heat exchangers in the second stage being alternately used after being freed of deposited coke.
  • the oil hereinafter to be explained is injected at a part between the first stage heat exchanger and the second stage heat exchangers.
  • the conventional quenching heat exchanger is replaced by quenching heat exchangers which consistof one heat exchanger in the first stage and two or more heat exchangers arranged in parallel in the second stage where deposit of coke is most pronounced and each one of the second stage heat exchanger is alternately used after removal of the deposited coke.
  • quenching heat exchangers consistof one heat exchanger in the first stage and two or more heat exchangers arranged in parallel in the second stage where deposit of coke is most pronounced and each one of the second stage heat exchanger is alternately used after removal of the deposited coke.
  • the heat exchangers consist of a first stage heat exchanger (upstream side) A and two or more of second stage heat exchangers (downstream side) B in the drawing.
  • l and 3 are inlets for feed stock to be thermally cracked and for steam, respectively.
  • 2 is a thermal cracking furnace.
  • 4 is a horizontal pipe still.
  • 6 is a steam generator.
  • 5 is a water inlet and 7 is a steam outlet.
  • 8 is an inlet of the oil which is injected between the first and the second stage heat exchangers.
  • EXAMPLE 1 To a SELAS type thermal cracking furnace which cracks tons/day of light naphtha (b.p. 40 C--l70 C) as a feed stock hydrocarbon to produce ethylene etc., 0.6 part (by weight) of steam was supplied for every 1.0 part (by weight) of naphtha.
  • the thermally cracked gas from the heating pipe 4 ofa thermal cracking furnace 2 was introduced into a quenching heat exchanger A and quenched down to a temperature into a quenching heat exchanger A and quenched down to a temperature of 450550 C. After passing through one of the quenching heat exchangers B, it was further quenched down to a temperature of 350450 C.
  • a quenching medium high pressure water is introduced at 5 into a steam generator 6 which is connected to the shell side of the heat exchangers A and B. Steam generated in the steam generator 6 leaves an outlet 7.
  • Each of the second stage heat exchangers B was alternately used after removal of the deposited coke in the tubes of the heat exchangers and thus the period of the continuous operation could be prolonged considerably. Compared with about 60 days of continuous operation period attained in case where quenching was effected at the outlet temperature of 350450 C with only one conventional quenching heat exchanger, the continuous operating period of this example could be prolonged to about. I00 days.
  • EXAMPLE 2 In the same apparatus as that of example 1, heavy bottoms of thermal cracking of naphtha was supplied at a rate of 0.2 ton/hour to the position 8 in order to inject into the thermally cracked gas. As the result of injection of the oil, the period for continuous operation could be prolonged to about 120 days compared with 100 days in case of Example I.
  • the injection of heavy bottoms of thermal cracking of naptha is carried out for the purpose of preventing the deposit of coke or the like and exceedingly prolongs the continuous operation period.
  • the said heavy bottoms used is recovered by fractionation in the naphtha-cracking plant.
  • a method for quenching thermally cracked hydrocarbon gases which comprises:
  • said other(s) of said at least two heat exchanger zones being at either the cleaning step or the standby step of its operation cycle while said one of said at least two heat exchanger zones is at the heat exchange step of its operation cycle.
  • thermally cracked gases are derived from the thermal cracking of light naphtha having a boiling point between 40 C and C.
  • a method for quenching thermally cracked hydrocarbon gases which comprises:
  • said other(s) of said at least two heat exchanger zones being at either the cleaning step or the standby step of its operation cycle while said one of said at least two heat exchanger zones is at the heat exchange step of its operation cycle.
  • An apparatus for quenching thermally cracked hydrocarbon gases which comprises:
  • said first stage heat exchanger means having an inlet for said thermally cracked gases and an outlet for said thermally cracked gases;
  • said at least two second stage heat exchanger means each containing inlet means and outlet means for said thermally cracked gases
  • At least one heat exhanger means is a shell and tube heat exchanger.
  • both said first stage heat exchanger means and said at least two second stage heat exchanger means are shell and tube heat exchangers.
  • An apparatus for quenching thermally cracked hydrocarbon gases which comprise:
  • said first stage heat exchanger means having inlet means for said thermally first stage heat exchanger means having inlet means for said cracked gases and outlet means for said thermally cracked gases;
  • said at least two second stage heat exchanger means each containing inlet means and outlet means for said thermally cracked gases; sald outlet means for the first stage heat exchanger means

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
US852731A 1968-09-12 1969-08-25 Heat exchanger for quenching thermally cracked gas Expired - Lifetime US3593779A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6523868A JPS5333561B1 (enrdf_load_stackoverflow) 1968-09-12 1968-09-12

Publications (1)

Publication Number Publication Date
US3593779A true US3593779A (en) 1971-07-20

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ID=13281118

Family Applications (1)

Application Number Title Priority Date Filing Date
US852731A Expired - Lifetime US3593779A (en) 1968-09-12 1969-08-25 Heat exchanger for quenching thermally cracked gas

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US (1) US3593779A (enrdf_load_stackoverflow)
JP (1) JPS5333561B1 (enrdf_load_stackoverflow)
DE (1) DE1945414A1 (enrdf_load_stackoverflow)
FR (1) FR2017872A1 (enrdf_load_stackoverflow)
GB (1) GB1268090A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3971667A (en) * 1974-03-25 1976-07-27 Raffinerie Tirlemontoise Installation for treating sugar-mill molasses
WO2000068631A1 (en) * 1999-04-27 2000-11-16 Tk Energi As Thermal gasification installation
CN102951983A (zh) * 2011-08-25 2013-03-06 中国石油化工股份有限公司 一种降低含氧化合物制烯烃装置能耗的方法
US20160169589A1 (en) * 2014-12-11 2016-06-16 Borsig Gmbh Quench-cooling system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2008311C3 (de) * 1970-02-23 1974-03-07 Arbeitsgemeinschaft Lentjes-Rekuperator, 4000 Duesseldorf-Oberkassel Wärmetauscher
JPS6175424U (enrdf_load_stackoverflow) * 1984-10-20 1986-05-21

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2877866A (en) * 1954-08-26 1959-03-17 Phillips Petroleum Co Improved quenching method
US2886483A (en) * 1953-05-27 1959-05-12 Rosenblads Patenter Ab Heating system for cellulose digestion plants

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1377327A (fr) * 1963-07-26 1964-11-06 Procédé et installation pour la production d'éthylène par pyrolyse d'hydrocarbures du pétrole
FR1469918A (fr) * 1964-12-19 1967-02-17 Basf Ag Procédé pour la production d'oléfines, notamment d'éthylène, par craquage thermique d'hydrocarbures

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2886483A (en) * 1953-05-27 1959-05-12 Rosenblads Patenter Ab Heating system for cellulose digestion plants
US2877866A (en) * 1954-08-26 1959-03-17 Phillips Petroleum Co Improved quenching method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3971667A (en) * 1974-03-25 1976-07-27 Raffinerie Tirlemontoise Installation for treating sugar-mill molasses
WO2000068631A1 (en) * 1999-04-27 2000-11-16 Tk Energi As Thermal gasification installation
CN102951983A (zh) * 2011-08-25 2013-03-06 中国石油化工股份有限公司 一种降低含氧化合物制烯烃装置能耗的方法
CN102951983B (zh) * 2011-08-25 2016-01-13 中国石油化工股份有限公司 一种降低含氧化合物制烯烃装置能耗的方法
US20160169589A1 (en) * 2014-12-11 2016-06-16 Borsig Gmbh Quench-cooling system
US10190829B2 (en) * 2014-12-11 2019-01-29 Borsig Gmbh Quench-cooling system

Also Published As

Publication number Publication date
JPS5333561B1 (enrdf_load_stackoverflow) 1978-09-14
FR2017872A1 (enrdf_load_stackoverflow) 1970-05-22
GB1268090A (en) 1972-03-22
DE1945414A1 (de) 1970-04-02

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