Title: Wall construction of a shaft furnace

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Claims: What we claim is:

1. A shaft furnace having a refractory-lined wall at least part of which is provided with liquid-cooled cooling plates which extend into the lining and are grouped in a plurality of horizontal planes, the cooling plates in each said plane being in heat-transfer contact with an associated ring extending around the furnace and consisting of refractory material of a first kind having a heat conductivity coefficient (.lambda.) at 20.degree.C of at least 25 kcal/h.m..degree.C, and the interior face of the lining being provided at least partly by refractory material of a second kind which has high resistance to wear and chemical attack and has a minimum reaction temperature (Tu) of at least 600.degree.C and a heat conductivity coefficient (.lambda.) at 20.degree.C of at least 8 kcal/h.m..degree.C.

2. A shaft furnace according to claim 1 wherein over at least part of its height the interior face of the lining is provided by a continuous inner layer of refractory material of the second kind.

3. A shaft furnace according to claim 2 wherein mutually abutting faces of the said rings on the one hand and the said inner layer on the other hand have complementary projections and recesses so as to provide an anchoring effect of the inner layer in the rings.

4. A shaft furnace according to claim 1. wherein the said refractory material of the second kind is, over at least part of the height of the wall in vertically separated layers between said rings, which extend to the interior face.

5. A shaft furnace according to claim 1 in the form of a blast furnace.

6. A shaft furnace according to claim 5 wherein in the shaft of the blast furnace the said rings consist of graphite and at the interior face there is a continuous inner layer of SiC bricks.

7. A shaft furnace according to claim 6 wherein in the transition zone of the blast furnace from shaft to bosh there is a continuous inner layer of SiC at the interior face and the rings consist of graphite bricks immediately above, and semi-graphite bricks immediately below, the cooling plates.

8. A shaft furnace according to claim 7 wherein in the bosh of the blast furnace the interior face of the lining partly consists of semi-graphite bricks, and the rings consist of graphite bricks, the semi-graphite bricks being in vertically separated layers between the rings.

9. A shaft furnace according to claim 8 wherein in the bosh the semi-graphite bricks are immediately above the cooling plates and the graphite bricks immediately below.

10. A shaft furnace according to claim 1 wherein the vertical spacing of neighbouring groups of cooling plates is not more than 60% of the local width of the refractory lining.

Other info:

Inventors: van Laar, Jacobus (Santpoort, NL)

Application Number: 503658
Filing Date: 1974-09-06
Publication_date: 1976-04-27
Assignee: Hoogovens Ijmuiden B.V. (Ijmuiden, NL)
Primary Class(es): 266/193 266/280
Other Classes:
US Patent Ref:

1014314	Jan, 1912	Marshall	266/32.
3652070	Mar, 1972	Sagara	266/32.
3682457	Aug, 1972	Hollingworth	266/25.

Other Refs:
Primary Examiner: Dost, Gerald A.
Assistant Examiner:
Attorney: Stevens, Davis, Miller & Mosher