EP0024632A1 - Utilisation d'un circuit fermé de refroidissement pour le refroidissement par évaporation d'un four de métallurgie ou analogue - Google Patents

Utilisation d'un circuit fermé de refroidissement pour le refroidissement par évaporation d'un four de métallurgie ou analogue Download PDF

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Publication number
EP0024632A1
EP0024632A1 EP80104777A EP80104777A EP0024632A1 EP 0024632 A1 EP0024632 A1 EP 0024632A1 EP 80104777 A EP80104777 A EP 80104777A EP 80104777 A EP80104777 A EP 80104777A EP 0024632 A1 EP0024632 A1 EP 0024632A1
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EP
European Patent Office
Prior art keywords
cooling
furnace
units
cooling medium
riser
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.)
Withdrawn
Application number
EP80104777A
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German (de)
English (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.)
MAN AG
Original Assignee
MAN Maschinenfabrik Augsburg Nuernberg AG
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 MAN Maschinenfabrik Augsburg Nuernberg AG filed Critical MAN Maschinenfabrik Augsburg Nuernberg AG
Publication of EP0024632A1 publication Critical patent/EP0024632A1/fr
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/10—Cooling; Devices therefor

Definitions

  • the invention relates to the use of a cooling circuit for evaporative cooling of a metallurgical or siderurgical furnace, in particular a shaft furnace, with natural circulation of the cooling medium with a large number of cooling units distributed in horizontal rows and vertical rows one above the other or side by side over the furnace height or width and with at least one overhead Steam-liquid separators including liquid containers, at least one vertical downcomer and riser connected to the steam-liquid separator and several on the one hand connected to the downpipe or riser and on the other hand to the inlet and outlet openings of the cooling units connected supply and discharge lines for the cooling medium.
  • the cooling units of such a cooling circuit are installed between the furnace lining and the furnace shell and protect both the furnace lining and the furnace shell against excessive temperatures.
  • the cooling medium flowing in via the downpipe in liquid form in particular as cooling water
  • the cooling medium flowing in via the downpipe in liquid form is subjected to evaporation under the action of the heat brought in from the inside of the furnace.
  • the evaporative cooling also takes place in the natural circulation of the cooling medium, the increased lift in the riser of the cooling circuit, which is increased by the formation of vapor bubbles, is used for the circulation.
  • the natural circulation of the cooling medium has the essential advantage over its forced circulation that the cooling is carried out independently of the failure-related failure of pumps. Accordingly, the evaporative cooling carried out using natural circulation also enables intensive furnace cooling, at least in theory.
  • a cooling circuit for evaporative cooling of a metallurgical or siderurgical furnace, in particular a blast furnace, with natural circulation of the cooling medium, as described in the introduction is known from DE-OS 21 06 682.
  • the invention has for its object, in the use of a cooling circuit for evaporative cooling with natural circulation of the cooling medium described above, the possibility of the occurrence of pulsations of vapor formation within the Cooling units and thus reduce the risk of destruction of the cooling units or eliminate them as completely as possible. In particular, increased local evaporation in individual cooling units should be avoided.
  • the invention relates to the use of a cooling circuit for evaporative cooling of a metallurgical or siderurgical furnace, in particular a shaft furnace, with natural circulation of the cooling medium with a large number of cooling units distributed in horizontal rows and in vertical rows one above the other or side by side over the furnace height or width and with at least an overhead steam-liquid separator including liquid container, at least one vertical downcomer and riser connected to the steam-liquid separator and several on the one hand connected to the downcomer or riser and on the other hand to the inlet and outlet openings of the cooling units and discharge lines for the cooling medium, each horizontal row having at least one in its height range essentially horizontal and in its height range on the downpipe and riser pipe as well as the inlet and outlet openings of the cooling unit It is assigned to the respective horizontal row of connected supply and discharge lines for the cooling medium, the cooling units of each horizontal row being acted upon in parallel by the cooling medium and the total amount of the cooling medium which can be introduced into each cooling unit exclusively in liquid form, in particular water, in coordination with
  • the invention is therefore based on the idea that the formation of steam in connection with the use of a cooling circuit for evaporative cooling within the cooling units described at the outset can be largely or even completely excluded solely by suitable dimensioning of the total amount of the coolant that can be introduced into each cooling unit.
  • the total amount of the coolant that can be introduced into each cooling unit is determined either by carrying out tests after the cooling units have been attached to the furnace to be cooled, or by calculation before the furnace is built. It can be seen that the evaporation of the cooling medium can also be prevented within a highly heat-loaded cooling unit only by selecting the total amount of the cooling medium which can be introduced into the cooling unit and thus the volume of the receiving space of the cooling unit to be small enough for the cooling medium.
  • the object of the invention is achieved in an advantageous manner above all because the specified arrangement of supply and discharge lines ensures that the steam bubbles occurring in the lower furnace areas are also fed directly to the riser by the riser then moving from the bottom horizontal row extends up over a large height range of the furnace.
  • the cooling units are formed from individual cooling elements, each with preferably the same size of receiving space for the cooling medium, and that each cooling unit consists of at least one such cooling element.
  • This design of the cooling units in the form of individual cooling elements means that the inventive adaptation of the total amount of cooling medium that can be introduced into a cooling unit can be carried out in a simple manner via the number of cooling elements combined to form a cooling unit.
  • the use of individual cooling elements means a low cost when the cooling circuit is first created and when it is repaired in the event of damage, since mutual exchange of cooling elements is possible to a large extent.
  • individual cooling units are each composed of a plurality of cooling elements which are arranged one above the other, directly connected to one another and acted upon from below by the cooling medium, the number of which is selected in accordance with the height of the different hydrostatic pressure conditions and heat offers.
  • This enables simple adaptation to the pressure and heat conditions in the individual furnace areas.
  • a variety of ovens stands out characterized in that the heat supply is relatively small in its lower height ranges.
  • the hydrostatic pressure in these lower furnace regions is greater than in the higher furnace regions, the steam formation in the lower furnace regions is always less favorable anyway.
  • the cooling units arranged in the lower height regions of the furnace are formed from at least two cooling elements, while those in the upper height regions of the furnace arranged cooling units each consist of only one cooling element. If the cooling units above are only made up of a single cooling element, the risk of steam formation in the upper height areas of the furnace is also low because transitions between individual cooling elements of a cooling unit can be omitted, in which due to deflection of the coolant flow and other obstacles to the free Cooling medium circulation preferably creates steam cushions.
  • the discharge line for the cooling medium which is assigned to a horizontal row, runs above the cooling units connected to the respective discharge line, preferably with a slight increase in the direction of their connection point on the climb management. This course of the discharge lines also reduces the risk of steam formation outside the cooling units and inside the discharge lines.
  • each supply line for the cooling medium belonging to a horizontal row runs at a lower height than the discharge lines for the cooling medium belonging to the same horizontal row. That the risk of vapor formation within the cooling units or elements is reduced here results from the fact that the hydrostatic pressure in the supply line is kept greater than in the discharge line.
  • the individual cooling unit comprise a cooling element into which the cooling medium is guided in the downward direction immediately after it enters and in the upward direction immediately before it exits.
  • a single cooling element preferably consists of a metallic plate, preferably of cast iron, with a cooling tube for the cooling medium, which extends on the inside in the form of an upright U.
  • the cooling circuit operated with cooling water comprises two overhead steam-water separators 1 including a liquid container 1a serving as a water reservoir, which is connected to the steam-water separators 1 by a connecting line 1b each.
  • the mixture of steam and water entering the steam-water separator 1 is separated into its phases within the steam-water separator 1.
  • the water passes from the steam-water separators 1 via the connecting lines 1b into the liquid container 1a, while the steam is fed via a steam outlet line 1c to a steam collecting line 1d. Steam reaches the outside via the steam collecting line 1d, in the direction of the arrow X.
  • the condensate formed within the steam outlet lines 1c and the steam collecting line 1d can flow back into the water space of the liquid container 1a via a return line 1e.
  • a plurality of cooling units 4 which are distributed one above the other or next to one another over the furnace height or width, are connected to the steam-water separators 1 with liquid container 1 a via a down pipe 2 and two risers 3.
  • the downpipe 2 and the risers 3 run vertically, with a riser 3 extending on one side of the downpipe 2.
  • the cooling units 4 are combined on both sides of the downpipe 2 to form a total of eight vertical rows a1, a2, ..., a8, forming two cooling unit subsystems A and B, while the cooling units 4 on each side of the downpipe 2 form a total of nine superimposed horizontal rows b 1 , b 2 , b 3 ' ..., b8 and b 9 are combined.
  • the cooling units 4 are connected to the downpipe 2 via inlet openings 5 and to the risers 3 via outlet openings 6, specifically via feed lines 7 or discharge lines 8.
  • the cooling units 4 of each horizontal row b 1 ... B9 are arranged on both sides of a riser line 3 a separate supply line running in its height range and connected in its height range to the downpipe 2 and the inlet openings 5 of the respective cooling units 4.
  • the cooling units 4 of each horizontal row b 1 ..., b 9 arranged on one side of each riser 3 have their own discharge line, which runs in its height range and is connected in its height range to the associated riser 3 and the outlet openings of the respective cooling units 4.
  • each horizontal row b 1 ,..., B 9 are acted upon by the cooling medium parallel to one another, the cooling medium via the down pipe 2 into each cooling unit 4 exclusively in enters liquid form, via the inlet openings 5.
  • the cooling medium also exits the cooling units 4 in liquid form again, via the outlet openings 6.
  • the cooling medium emerging from the cooling units via the outlet openings 6 is warmed up by the heat transported in from the interior of the furnace.
  • the interior of the furnace is not illustrated in the drawing.
  • the cooling units 4 are between the furnace lining and the inside, i.e. H. Furnace compartment side of the furnace shell attached.
  • the furnace lining and the furnace shell are also not shown in the drawing.
  • the cooling units 4 are formed from individual cooling elements 4a with an equally large receiving space for the cooling medium.
  • the cooling units 4 of the horizontal rows b 2 , b 3 , ..., b 8 and bg each consist of only one such cooling element 4a, while the cooling units 4 of the bottom horizontal rows b 1 each consist of several superposed, directly connected and one after the other cooling elements acted upon from below by the cooling medium; this applies to each cooling unit 4 of the horizontal row b 1 .
  • each belonging to a horizontal row b 1, ... bg or associated supply lines 7 for the cooling medium in the case of all horizontal rows b 1, ... b 9 or horizontal, at a lower level than the same horizontal row b to 1 .. . or bg associated discharge lines.
  • the cooling medium is guided inside each cooling element 4a immediately after its entry in the downward direction and immediately before its exit in the upward direction.
  • each individual cooling element 4a consists of a cast iron plate with an inside in. essentially in the form of an upright U extending cooling tube for the cooling medium.
  • the direction of flow of the cooling medium is indicated by arrows Y, for the circulation both inside and outside the cooling units 4 or cooling elements 4a.
  • the cooling medium flows through the cooling circuit in the direction of the arrows Y in natural circulation, the cooling being carried out by evaporative cooling.
  • each cooling unit exclusively in liquid form, in particular water, in coordination with the height of the hydrostatic pressure conditions and the heat available from the inside of the furnace so that the water completely only outside the cooling units 4 or cooling elements 4a whose passage in the risers 3 evaporates.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Details (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Blast Furnaces (AREA)
EP80104777A 1979-08-25 1980-08-13 Utilisation d'un circuit fermé de refroidissement pour le refroidissement par évaporation d'un four de métallurgie ou analogue Withdrawn EP0024632A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2934421 1979-08-25
DE19792934421 DE2934421A1 (de) 1979-08-25 1979-08-25 Verwendung eines kuehlkreislaufs fuer die verdampfungskuehlung eines metallurgischen ofens o.dgl.

Publications (1)

Publication Number Publication Date
EP0024632A1 true EP0024632A1 (fr) 1981-03-11

Family

ID=6079281

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80104777A Withdrawn EP0024632A1 (fr) 1979-08-25 1980-08-13 Utilisation d'un circuit fermé de refroidissement pour le refroidissement par évaporation d'un four de métallurgie ou analogue

Country Status (3)

Country Link
EP (1) EP0024632A1 (fr)
JP (1) JPS5633410A (fr)
DE (1) DE2934421A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102443665B (zh) * 2011-12-02 2014-01-29 莱芜钢铁集团有限公司 一种用于检修门的冷却壁连管连接方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1458787A1 (de) * 1965-10-23 1969-01-23 Koelsch Foelzer Werke Ag Einrichtung und Verfahren zur Verdampfungskuehlung bei Schachtoefen
FR2130016A1 (en) * 1971-03-26 1972-11-03 Inst Ochistke Closed loop steam forming cooling installation - with steam separators
FR2149292A1 (en) * 1971-08-18 1973-03-30 V Nauchno Issle Blast furnace cooler - employing an evaporative cooling system with cooling element pipes of uniform cross section
DE2122317B2 (de) * 1971-05-06 1974-02-07 Ewald W. Dr.-Ing. 5905 Freudenberg Rohde Verdampfungskühlsystem für metallurgische Öfen, insbesondere Hochöfen
DE1533831B2 (de) * 1967-03-18 1975-08-28 Deutsche Babcock & Wilcox-Dampfkessel-Werke Ag, 4200 Oberhausen Verfahren zum Heißkühlen eines Schachtofens, insbesondere Hochofens
FR2272351A1 (fr) * 1974-05-20 1975-12-19 Nippon Kokan Kk

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1458787A1 (de) * 1965-10-23 1969-01-23 Koelsch Foelzer Werke Ag Einrichtung und Verfahren zur Verdampfungskuehlung bei Schachtoefen
DE1533831B2 (de) * 1967-03-18 1975-08-28 Deutsche Babcock & Wilcox-Dampfkessel-Werke Ag, 4200 Oberhausen Verfahren zum Heißkühlen eines Schachtofens, insbesondere Hochofens
FR2130016A1 (en) * 1971-03-26 1972-11-03 Inst Ochistke Closed loop steam forming cooling installation - with steam separators
DE2122317B2 (de) * 1971-05-06 1974-02-07 Ewald W. Dr.-Ing. 5905 Freudenberg Rohde Verdampfungskühlsystem für metallurgische Öfen, insbesondere Hochöfen
FR2149292A1 (en) * 1971-08-18 1973-03-30 V Nauchno Issle Blast furnace cooler - employing an evaporative cooling system with cooling element pipes of uniform cross section
FR2272351A1 (fr) * 1974-05-20 1975-12-19 Nippon Kokan Kk

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
STAHL UND EISEN, Band 77, Nr. 17, 22. August 1957, Seiten 1126-1134, D}sseldorf, DE. R. VONNEMANN: "Neue Verfahren der Heissk}hlung". *

Also Published As

Publication number Publication date
JPS5633410A (en) 1981-04-03
DE2934421A1 (de) 1981-03-19

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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ITCL It: translation for ep claims filed

Representative=s name: BARZANO' E ZANARDO MILANO S.P.A.

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Effective date: 19810323

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Effective date: 19820531

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Inventor name: DER ERFINDER HAT AUF SEINE NENNUNG VERZICHTET.