US3814174A - Stack type recuperator having a liquid seal - Google Patents

Stack type recuperator having a liquid seal Download PDF

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Publication number
US3814174A
US3814174A US00029080A US2908070A US3814174A US 3814174 A US3814174 A US 3814174A US 00029080 A US00029080 A US 00029080A US 2908070 A US2908070 A US 2908070A US 3814174 A US3814174 A US 3814174A
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US
United States
Prior art keywords
sleeve
plenum
recuperator
liquid
metallic
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.)
Expired - Lifetime
Application number
US00029080A
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English (en)
Inventor
D Beggs
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.)
ZURICH BRANCH OF MIDREX INTERNATIONAL BV A NETHERLANDS Corp
Midrex Corp
MILDREX CORP
Original Assignee
MILDREX CORP
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 MILDREX CORP filed Critical MILDREX CORP
Priority to US00029080A priority Critical patent/US3814174A/en
Priority to CA097378A priority patent/CA927817A/en
Priority to BE763481A priority patent/BE763481A/xx
Priority to NL7102782.A priority patent/NL161867C/nl
Priority to FR7109140A priority patent/FR2092420A5/fr
Priority to NO01126/71A priority patent/NO127318B/no
Priority to DE2116988A priority patent/DE2116988C3/de
Priority to SE7104849A priority patent/SE374599B/xx
Priority to ES1971168024U priority patent/ES168024Y/es
Priority to GB2090771A priority patent/GB1306906A/en
Application granted granted Critical
Publication of US3814174A publication Critical patent/US3814174A/en
Assigned to MIDREX CORPORATION, A DE CORP. reassignment MIDREX CORPORATION, A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MIDLAND-ROSS CORPORATION,
Assigned to ZURICH BRANCH OF MIDREX INTERNATIONAL, B.V. A NETHERLANDS CORPORATION reassignment ZURICH BRANCH OF MIDREX INTERNATIONAL, B.V. A NETHERLANDS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MIDREX CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L15/00—Heating of air supplied for combustion
    • F23L15/04—Arrangements of recuperators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M20/00—Details of combustion chambers, not otherwise provided for, e.g. means for storing heat from flames
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/051—Heat exchange having expansion and contraction relieving or absorbing means
    • Y10S165/052—Heat exchange having expansion and contraction relieving or absorbing means for cylindrical heat exchanger
    • Y10S165/06—Expandable casing for cylindrical heat exchanger

Definitions

  • a stack type recuperator In the fuel fired industrial furnace field, heat exchangers are commonly employed to preheat combustion air by extracting heat from hot combustion gases leaving a furnace.
  • One common type of such heat exchanger is the stack type recuperator, which is a type particularly adapted to large size industrial furnaces such as steel mill soaking pits and slab heating furnaces.
  • a stack type recuperator generally consists of a self supporting, vertically oriented, cylindrically shaped steel outer shell which is lined internally with refractory.
  • a cylindrically shaped, heat resisting liner is positioned within the refractory lining to form an annulus therebetween.
  • I-Iot exhaust gases are admitted to the lower region of the alloy liner and flow upwardly and are discharged from the top. Air to be heated passes through the annulus betweenthe liner and the refractory lining, normally in counterflow relationship to the hot gases.
  • the alloy liner is generally fixed to the outer steel shell at the top; means is provided to allow thermal expansion at its lower end.
  • the commonly employed means to accommodate vertical movement of the lower end of the liner, and also provide a pressure seal between the combustion air and hot gases, is a large stainless steel bellows. Such bellows are not only costly, but are often a continual source of maintenance due to the occurrence of leaks.
  • the bellows often tend to impose strains on alloy liners as they expand and contract, which strains tend to buckle and shorten the useful life of such liners. It has been found that the bellows may be replaced with a liquid seal which accommodates the need of thermal expansion without the shortcomings associated with the bellows.
  • FIG. 1 shows a generally elevational view, in section, of a stack type metallic recuperator incorporating the seal of the present invention.
  • FIG. 2 shows the seal arrangement of FIG. 1 in greater detail.
  • FIG. 3 shows another embodiment of the seal for a stack recuperator.
  • a stack type metallic recuperator is shown generally at 10 including a housing 12 having a cylindrical steel shell 11 and a supporting base 13.
  • the housing 12 is lined with a refractory 15, such as insulating firebrick which will resist wind abrasion.
  • a generally cylindrical heat resisting metallic or alloy sleeve 17 depends from the upper end of the housing 12 by a conical section 19 which is secured in an airtight manner to the shell 11, such as by welding to a flange region 21.
  • the alloy sleeve 17 is spaced apart from the refractory lining 15 by suitable spacer brackets 23 fastened to the steel shell 11, thereby forming an annular air passage 25.
  • an opening 26 which receives a pipe 27 through which cold air to be preheated is introduced into a plenum 29 which is defined by the conical section 19, the shell 15, and the top surface of the refractory 15.
  • Located at the lower portion of the refractory lining 15 is an annular air plenum 31 having an opening 32 that receives an air pipe 33.
  • the air pipe 33 generally leads to a furnace burner or burners (not shown).
  • Located below the air plenum 31 is a hot gas pipe 35.
  • a refractory lined inner wall member 37 is located in the lower end of the housing 12.
  • the wall member 37 has an annular wall 34, which extends into the sleeve 17, a base 36, and an opening 38 which provides communication between the pipe 35 and the central portion of the recuperator 10.
  • the wall member 37 is securedat its upper region by a heat resisting alloy cylinder 39 having fastened thereto a base ring 41 which contacts the outer shell 11, the combination thereof forming an annular well or vessel 43.
  • the annular well 43 is adapted to contain a liquid, such as water, and receives the lower portion of the alloy sleeve 17 to define a section on each side of the sleeve portion received therein.
  • the well 43 has an opening 44 which is in communication with a reservoir tank 45 by means of a pipe 47 extending therebetween.
  • the reservoir tank 45 has a weir 49 located therein to control the level of liquid.
  • a feed line 51 is located above the reservoir tank 45 supplying liquid thereto, and a drain 53 is located adjacent the weir 49 to drain the surplus liquid.
  • the water level in reservoir tank 45 is indicated at 55 and the water level in well 43 is indicated by 57 on the inner side of the sleeve 17 and by 59 and 60 on the opposite side of the sleeve 17.
  • FIG. 3 an alternate arrangement is shown for maintaining a substantially constant level of water in the well 43 on the inner side of liner 17.
  • Water is supplied by a pipe 63 having a valve 64.
  • a standpipe 57 positioned on the inside of liner 17 serves as a weir to remove fluid overflow in the well through pipe 65 which leads to a drain 67.
  • Cold air to be preheated is introduced through pipe 27 into the plenum 29 from which the air flows down wardly through annulus 25 to a preheated air plenum 31 and out preheated air pipe 33, as shown generally by the flow arrows.
  • the air pipe 33 supplies preheated air to furnace burners which generate the hot gases used to heat work or supply heat for a process, the spent gases of which are used by the recuperator 10 to preheat air.
  • the hot spent gases are introduced into the base region through the pipe 35 and flow into the refractory lined inner wall member 37, and thence flow upwardly inside the alloy sleeve 17 and exit at the top of the recuperator 10.
  • the sleeve 17 is made'of a metal or alloy, an exchange of thermal energy will take place between the air flowing through plenum 25 and the spent gases flowing within the sleeve 17.
  • the flow of hot spent gases is low or high, since the sleeve 17 is open to the atmosphere at the top end.
  • the static pressure of the preheated air external of the sleeve 17 will normally-be a positive pressure due to the back pressure imposed on the combustion air system by the burners, and this pressure will vary as the flow of air may vary.
  • the preheated air back pressure is 0, the water level would be in the position as indicated at 57 and 59 and both will be substantially the same as water level 55 in tank 45.
  • water level 59 depresses as indicated at 60, but'water level 57 and 55 remains substantially the same due to equalizing pipe 47.
  • a metallic stack type recuperator comprising: a generally vertical housing closed at its lower end and open at its'upper'end, a metallic sleeve received within said housing and defining a plenum therebetween, means for closingsaid plenum at the top thereof, wall means forming a vessel located at the bottom of said housing and receiving the bottom portion of said sleeve, a liquid contained within said vessel, a bottom portion of said sleeve being immersed in said liquid,
  • '4 means for supplying a first fluid at the upper portion of said plenum, means for removing said first fluid from the lower portion of said plenum, and means for supplying a second fluid to the interior of said sleeve.
  • the metallic recuperator of claim 1 including means for regulating the level of said liquid in said vessel.
  • the metallic recuperator of claim 1 including wall means located above said liquid level to shield said liquid from exposureto the interior of said recuperator.
  • a metallic stack type recuperator comprising: a generally cylindrical housing closed at its lower end and having a refractory interior lining, a cylindrical metallic sleeve received within the upper portion of said housing anddefining a plenum therebetween, means for closing said plenum at the top thereof, a cylindrical wall member seated at the bottom of said housing and extending within the bottom portion of said sleeve, a base ring located below said sleeve and extending from said wall member to said housing to define in cooperation with said wall member, said housing, and said sleeve a two sectioned vessel having.
  • the Eiaiiic"'rtibior of claim 1 including means for regulating the level of said liquid in said vessel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Soft Magnetic Materials (AREA)
  • Manufacture Of Motors, Generators (AREA)
US00029080A 1970-04-16 1970-04-16 Stack type recuperator having a liquid seal Expired - Lifetime US3814174A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US00029080A US3814174A (en) 1970-04-16 1970-04-16 Stack type recuperator having a liquid seal
CA097378A CA927817A (en) 1970-04-16 1970-11-04 Stack type recuperator having a liquid seal
BE763481A BE763481A (fr) 1970-04-16 1971-02-26 Recuperateur
NL7102782.A NL161867C (nl) 1970-04-16 1971-03-02 Inrichting voor het terugwinnen van warmte.
FR7109140A FR2092420A5 (nl) 1970-04-16 1971-03-16
NO01126/71A NO127318B (nl) 1970-04-16 1971-03-24
DE2116988A DE2116988C3 (de) 1970-04-16 1971-04-07 Wärmeaustauscher
SE7104849A SE374599B (nl) 1970-04-16 1971-04-14
ES1971168024U ES168024Y (es) 1970-04-16 1971-04-16 Recuperador de color tipo chimenea.
GB2090771A GB1306906A (en) 1970-04-16 1971-04-19 Recuperator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00029080A US3814174A (en) 1970-04-16 1970-04-16 Stack type recuperator having a liquid seal

Publications (1)

Publication Number Publication Date
US3814174A true US3814174A (en) 1974-06-04

Family

ID=21847108

Family Applications (1)

Application Number Title Priority Date Filing Date
US00029080A Expired - Lifetime US3814174A (en) 1970-04-16 1970-04-16 Stack type recuperator having a liquid seal

Country Status (10)

Country Link
US (1) US3814174A (nl)
BE (1) BE763481A (nl)
CA (1) CA927817A (nl)
DE (1) DE2116988C3 (nl)
ES (1) ES168024Y (nl)
FR (1) FR2092420A5 (nl)
GB (1) GB1306906A (nl)
NL (1) NL161867C (nl)
NO (1) NO127318B (nl)
SE (1) SE374599B (nl)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4300627A (en) * 1979-06-04 1981-11-17 Cleveland Joseph J Insulated housing for ceramic heat recuperators and assembly
US4510892A (en) * 1984-06-18 1985-04-16 Combustion Engineering, Inc. Seal for boiler water wall
US4604972A (en) * 1985-03-11 1986-08-12 Foster Wheeler Energy Corporation Seal assembly for a vapor generator
US6675880B2 (en) 1996-03-29 2004-01-13 Mitsui Engineering And Shipbuilding Company Limited Air heater for recovering a heat of exhaust gas
US20120042687A1 (en) * 2010-08-23 2012-02-23 Showa Denko K.K. Evaporator with cool storage function

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2332450A (en) * 1940-04-08 1943-10-19 Gen Properties Company Inc Heat exchanger
US3346042A (en) * 1965-10-13 1967-10-10 Gen Ionics Corp Radiation recuperator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2332450A (en) * 1940-04-08 1943-10-19 Gen Properties Company Inc Heat exchanger
US3346042A (en) * 1965-10-13 1967-10-10 Gen Ionics Corp Radiation recuperator

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4300627A (en) * 1979-06-04 1981-11-17 Cleveland Joseph J Insulated housing for ceramic heat recuperators and assembly
US4510892A (en) * 1984-06-18 1985-04-16 Combustion Engineering, Inc. Seal for boiler water wall
US4604972A (en) * 1985-03-11 1986-08-12 Foster Wheeler Energy Corporation Seal assembly for a vapor generator
US6675880B2 (en) 1996-03-29 2004-01-13 Mitsui Engineering And Shipbuilding Company Limited Air heater for recovering a heat of exhaust gas
US20120042687A1 (en) * 2010-08-23 2012-02-23 Showa Denko K.K. Evaporator with cool storage function

Also Published As

Publication number Publication date
ES168024Y (es) 1972-04-16
DE2116988A1 (de) 1971-10-28
NL7102782A (nl) 1971-10-19
NL161867B (nl) 1979-10-15
DE2116988C3 (de) 1978-05-11
ES168024U (es) 1971-10-16
BE763481A (fr) 1971-07-16
NO127318B (nl) 1973-06-04
NL161867C (nl) 1980-03-17
GB1306906A (en) 1973-02-14
CA927817A (en) 1973-06-05
SE374599B (nl) 1975-03-10
FR2092420A5 (nl) 1972-01-21
DE2116988B2 (de) 1977-09-15

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Legal Events

Date Code Title Description
AS Assignment

Owner name: MIDREX CORPORATION, 3900 NCNB PLAZA, CHARLOTTE, NC

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MIDLAND-ROSS CORPORATION,;REEL/FRAME:004180/0679

Effective date: 19831010

AS Assignment

Owner name: ZURICH BRANCH OF MIDREX INTERNATIONAL, B.V. A NETH

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MIDREX CORPORATION;REEL/FRAME:004282/0555