EP0892078B1 - Grille pour un récupérator de chaleur - Google Patents

Grille pour un récupérator de chaleur Download PDF

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Publication number
EP0892078B1
EP0892078B1 EP97112351A EP97112351A EP0892078B1 EP 0892078 B1 EP0892078 B1 EP 0892078B1 EP 97112351 A EP97112351 A EP 97112351A EP 97112351 A EP97112351 A EP 97112351A EP 0892078 B1 EP0892078 B1 EP 0892078B1
Authority
EP
European Patent Office
Prior art keywords
materials
mpa
cast
grating
temperature
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
EP97112351A
Other languages
German (de)
English (en)
Other versions
EP0892078A1 (fr
Inventor
Christian Dr. Biegus
Kurt Braun
Hans-Eugen Prof. Dr. Bühler
Teodor Dr. Krone
Wolfgang Prof. Dr. Bleck
Ulrich Jobst Brand
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.)
Paul Wurth Deutschland GmbH
Original Assignee
Didier M&P Energietechnik GmbH
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 Didier M&P Energietechnik GmbH filed Critical Didier M&P Energietechnik GmbH
Priority to AT97112351T priority Critical patent/ATE224463T1/de
Priority to EP97112351A priority patent/EP0892078B1/fr
Priority to DE59708266T priority patent/DE59708266D1/de
Publication of EP0892078A1 publication Critical patent/EP0892078A1/fr
Application granted granted Critical
Publication of EP0892078B1 publication Critical patent/EP0892078B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B9/00—Stoves for heating the blast in blast furnaces
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/06—Cast-iron alloys containing chromium
    • C22C37/08—Cast-iron alloys containing chromium with nickel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D17/00—Regenerative heat-exchange apparatus in which a stationary intermediate heat-transfer medium or body is contacted successively by each heat-exchange medium, e.g. using granular particles
    • F28D17/02—Regenerative heat-exchange apparatus in which a stationary intermediate heat-transfer medium or body is contacted successively by each heat-exchange medium, e.g. using granular particles using rigid bodies, e.g. of porous material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • F27D2017/007—Systems for reclaiming waste heat including regenerators

Definitions

  • the invention relates to a grate for a hot water heater, which consists of a easily machinable cast material, which is a long-term use with increased Exhaust gas temperatures on the grating up to 600 ° C allowed without permanent operation There is a risk of material failure over a period of 20 years.
  • Gratings made of cast materials are used in hot air heaters in the grate shafts as Support structure for the trimmings, i.e. for those that use regenerative heat storage inserted storage stones in systems with internal or external Burning shaft.
  • the task therefore was to close a grate for a hot water heater develop, which consists of an inexpensive to produce casting material, the allows long-term use at elevated exhaust gas temperatures of up to 600 ° C, without fear of material failure.
  • the casting materials mentioned above were on the one hand with a conventional, chrome-alloyed GG25, showing a lamellar graphite structure, a standard material for gratings (V1), but also with Trial bars of gratings from the blast furnace systems of blast furnace 6 Thyssen Stahl AG (V5) and with samples from the grate of the hot water heater A1 des Blast furnace A of Preussag Stahl AG (V6) compared.
  • the grating of the Blast heater system of blast furnace 6 of Thyssen Stahl AG has been around for about 30 years in operation.
  • Blast furnace A of Preussag Stahl AG was built in 1981, whereby the hot air heater was first put into operation without air preheating and since 1986 after installing a heat recovery system Exhaust gas temperatures around 400 ° C was operated with the grating from the Blast heater system of blast furnace 6 of Thyssen Stahl AG (V5) an unalloyed gray cast iron that corresponds to the composition of a GG25.
  • the Grating from the blast heater system of blast furnace A from Preussag Stahl AG (V6) is in its chemical composition with the alloyed GG25 (V1) comparable.
  • the casting materials mentioned above were also included a material of the basic composition of a GGG60 with pearlitic-bainitic Basic matrix (V3) compared
  • Fig. 1 shows a schematic representation of the temperature profiles of the gratings of the Winder heater A1 of the blast furnace A of Preussag Stahl AG and the winder heater of blast furnace 6 of Thyssen Stahl AG. The cyclical change of the is shown different maximum exhaust gas temperature
  • Fig. 1 The temperature profile shown in Fig. 1 shows the constant extreme Temperature changes, which those made from the cast materials V5 and V6 Gratings have been exposed for many years. To the thermal load enormous static, mechanical and oxidative stresses come when one assumes 8 to 10 temperature cycles per day, about 3,000 Temperature cycles per year are the same as those required by a grating Lifespan of 20 to 30 years, a low-frequency continuous load of far result in over 60,000 temperature cycles.
  • FIG. 2 shows the course of the hot tensile strength (R m ) as a function of the test temperature.
  • the cast materials V2 and V4 show higher hot tensile strengths at all temperatures than the cast material V1 (GG25) corresponding to the state of the art.
  • the particularly high hot tensile strength of the cast material V3 cannot be used for a certain reason, which can be clearly seen from the diagram in FIG. 3.
  • the conventional casting material V1 is inferior to the casting materials V2 and V4 according to the invention, because - as FIG. 2 shows - its hot tensile strength, measured according to DIN 1691, is significantly below the strength values of V2 and V4. It is noteworthy that a significant decrease in strength occurs at 500 ° C for material V1, while a comparable decrease in strength can only be observed with material V2 from 600 ° C.
  • the tensile strengths determined for the materials examined are summarized in Table 2 below: Determined tensile strengths for the investigated materials Temperature in ° C V1 R m in MPa V2 R m in MPa V3 R m in MPa V4 R m in MPa V5 R m in MPa V6 R m in Mpa RT (DIN 50 109) 257 328 622 480 142 175 200 249 330 511 453 137 144th 400 260 296 370 466 131 145 500 244 269 409 374 100 125 550 - - 390 344 68 - 600 171 241 262 266 - 84 650 132 205 267 207 - - 700 103 156 - 148 - 46 750 54 85 - 87 - - 800 - - - - - - -
  • the conversion behavior that is important for the mechanical properties of the gray cast iron materials is represented by the dilatometer curves of FIG. 3.
  • the conversion temperatures and thermal expansion coefficients found for the alloys examined are summarized in Table 3 Determined transition temperatures and thermal expansion coefficients for materials V1, V2, V3 and V4 material A c1 in ° C A c3 in ° C Thermal expansion coefficient in ferrite in ⁇ m / m K GG25-Cr (V1) 783 813 10.8 ( ⁇ 750 ° C) GG25-Cr-Ni-Mo (V2) 755 801 10.8 ( ⁇ 750 ° C) GGG60 (V3) 714 796 18.3 ( ⁇ 400 ° C) GGG50 (V4) 774 839 15.2 ( ⁇ 700 ° C)
  • the examined casting materials show in metallographic examinations following properties. While the structure of materials V1 and V2 by the usual lamellar graphite arrangement and the pearlitic-leather-buritic Structure is determined, the material V4 is a vermicular Formation of graphite before. The mechanical properties of materials This structure formation is to be found between gray cast iron and nodular cast iron Examination of the cast material V4 has a 30% sparolitic training result Its matrix is ferritic-pearlitic and contains no ledeburitic Shares more. In contrast, spheroidal graphite cast iron GGG60 (V3) has a bainitic pearlitic Structure on, for the reasons already mentioned to be less favorable mechanical properties. In addition, the high strength values at a pearlitic-bainitic structure to problems in machining lead, so that this material for the production of gratings in hot air heaters for this reason too it must be regarded as unsuitable
  • the chrome-alloyed material V6 obtained from Preussag Stahl AG shows up to the maximum operating temperature of 420 ° C strength values between 175 MPa and 145 MPa.
  • V5 and V6 it could be demonstrated that none despite decades of use in the temperature range under consideration significant losses in strength. This can be explained by that these cast materials do not exist in the temperature range examined Experienced structural changes and a linear expansion coefficient demonstrate.
  • Both the cast material V2 and the cast material V4 show strength values at temperatures of 600 ° C, which are comparable to the strength value of the cast material V1 at 400 ° C. Based on the permissible voltages with a safety factor of around 8, the following permissible voltages result at an operating temperature of 600 ° C: Permissible stress of the casting materials according to the invention at 600 ° C. casting material Allowable voltage V2 29 MPa V4 32 MPa
  • the material according to the invention thus allows, in the conventional Temperature range up to 400 ° C weight savings of the gratings. He Above all, it also enables hot air heaters in a temperature range up to 600 ° C to operate, reducing the size by saving energy achieve a higher efficiency and thus a higher one Offer environmental sustainability. This is associated with material savings of up to 30% without compromising the high standard of security criteria.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Dispersion Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Thermal Sciences (AREA)
  • Heat Treatment Of Steel (AREA)
  • Resistance Heating (AREA)
  • Mold Materials And Core Materials (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Devices For Medical Bathing And Washing (AREA)

Claims (2)

  1. Grille pour un réchauffeur de vent, caractérisée en ce qu'elle est à base d'un matériau de moulage,
    sa structure de base est périltique/lédeburitique et
    présente en même temps une structure de graphite lamellaire, le matériau de moulage
    montrant un comportement à l'expansion linéaire et pas de modifications notables de la structure dans la plage comprise entre 20 et 600 °C,
    présentant une résistance supérieure à 240 Mpa (mesurée selon DIN 50109) à une température de 600 °C et
    présentant une viscosité avec un taux d'extension supérieur à 10 %.
  2. Grille selon la revendication 1, caractérisée en ce que la structure de base du matériau de moulage contient
    0,6 à 1,0 pour-cent en poids de chrome,
    0,8 à 1,5 pour-cent en poids de nickel et
    0,4 à 0,7 pour-cent en poids de molybdène,
    la quantité totale de chrome, de nickel et de molybdène s'élevant entre 1,8 et 3,2 pour-cent du matériau de moulage.
EP97112351A 1997-07-18 1997-07-18 Grille pour un récupérator de chaleur Expired - Lifetime EP0892078B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT97112351T ATE224463T1 (de) 1997-07-18 1997-07-18 Gitterrost für einen winderhitzer
EP97112351A EP0892078B1 (fr) 1997-07-18 1997-07-18 Grille pour un récupérator de chaleur
DE59708266T DE59708266D1 (de) 1997-07-18 1997-07-18 Gitterrost für einen Winderhitzer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97112351A EP0892078B1 (fr) 1997-07-18 1997-07-18 Grille pour un récupérator de chaleur

Publications (2)

Publication Number Publication Date
EP0892078A1 EP0892078A1 (fr) 1999-01-20
EP0892078B1 true EP0892078B1 (fr) 2002-09-18

Family

ID=8227086

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97112351A Expired - Lifetime EP0892078B1 (fr) 1997-07-18 1997-07-18 Grille pour un récupérator de chaleur

Country Status (3)

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EP (1) EP0892078B1 (fr)
AT (1) ATE224463T1 (fr)
DE (1) DE59708266D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080199820A1 (en) * 2005-02-01 2008-08-21 Danieli Corus Bv Support Assembly For Supporting Heat Regeneration Checker Work In A Hot Blast Stove, Hot Blast Stove Provided With Said Support Assembly, Method Of Producing Hot Air Using Said Hot Blast Stove
CN109023025B (zh) * 2018-08-20 2019-11-29 江苏力源金河铸造有限公司 一种具有高延伸率蠕墨铸铁的制备方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1461822A (en) * 1973-03-19 1977-01-19 Didier Werke Ag Checkerwork-supporting grate for blast furnace stoves
US4176656A (en) * 1978-04-10 1979-12-04 Komorowski Alexander F Nitrogen-heat separator furnace
DE3706516C2 (de) * 1987-02-28 1996-05-23 Kuepper August Gmbh & Co Kg Titan- und Aluminium-haltige Gußeisen-Legierung für die Herstellung thermisch hoch belasteter Motorenteile
DE3841708C1 (fr) * 1988-12-10 1989-12-28 Kloeckner Cra Patent Gmbh, 4100 Duisburg, De
FR2681878B1 (fr) * 1991-09-26 1993-12-31 Centre Tech Ind Fonderie Fonte a graphite spherouidal resistant a la chaleur.

Also Published As

Publication number Publication date
EP0892078A1 (fr) 1999-01-20
ATE224463T1 (de) 2002-10-15
DE59708266D1 (de) 2002-10-24

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