LU80606A1 - METAL COOLING ELEMENTS FOR INDUSTRIAL OVENS - Google Patents

Description

) / Transfer report äe..la ... demand .- .. d £ ... brav.et ... dlinventiQn ................... ......

GRAND-DUCHY - LUXEMBOURG N ° .............? 0.606 ............

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Ministry of Economy Netionele The year one thousand nine centclix — nine --------- Ie twenty three November the sieur ......... René Neyen___________________________ __________ engineer ........ ................ c / o ARBED SA .......... .................................................. ..........

CP 1802 .......................................... Luxembourg ..... .................................................. .................................................. ..........

went to the Ministry of National Economy, Industrial Property Service and deposited there: 1) an act dated .. Luxembourg .............., the ..23 November 1979 .........

noting that the patent application .......... the filing of which was made on _______ 1,12,197.8 ......................... ...... and registered under N ° .......? Ρ. · .§06 .................. ...... ..

by its. des .Ancien Etablissements Emile Dupret ............

98-102, rue Auguste-Charles ............... LUXEMBOURG ... (Grand Duchy of Luxembourg) ................ ..

has been transferred to full ownership, ............................ ............

............. ARBED SA ......... .......... ................ .....................................

____________ Avenue of Liberty .....................

Luxembourg (Grand Duchy of Luxembourg) 2) a declaration by the said assignee to designate as its representative the sieur ----------- René Neyen ............... .................................................. ........................... already appointed.

The latter elects domicile for him and for his new principal at ARBED, avenue de la Liberté Luxembourg.

3) The receipt confirming the payment of the fees provided for at the Registration Office in Luxembourg.

Of all this, these minutes have been drawn up, made and signed in duplicate in Luxembourg, date at the top.

The Applicant, Pr. The Minister of National Economy

The .Government Advisor

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PATENT

Applicant: S.A. des Anciens Etablissements Emile Dupret

98-102, rue Auguste-Charles LUXEMBOURG

Metal cooling elements for industrial ovens

The present invention relates to cooling elements for industrial ovens, in particular cooling boxes or plates for tank ovens, such as blast furnaces or cupola furnaces, as well as for deck ovens and reheating ovens and any thermal enclosure. at high temperature.

According to the most usual mode of construction of blast furnaces, the tank and the displays of this machine are equipped with cooling boxes. These support and re-cool the interior lining in refractory materials at the aforementioned areas. A blast furnace with a crucible diameter of the order of magnitude 9 m requires approximately 1,000 cooling boxes.

As the cooling boxes project in a horizontal direction inside the blast furnace they are exposed to a very pronounced wear as well by the downward load as by the gases and the ascending dust once the refractory masonry, which in the state new protects the noses .from the cooling boxes, is partially worn. As a result, the cooling boxes wear out and must be replaced at a high rate. Furthermore, this system is not able to avoid very pronounced thermal stresses in the shielding of the blast furnace.

In particular for the construction of blast furnaces with a crucible diameter greater than 10 m, we have recently developed vertical cooling plates in cast iron composed of a plate body and a water circulation tube molded in l inside this body. The plate body is often provided with horizontal ribs with a width of the order of 40-70 mm and a depth of the order of 110-120 mm. The hot side of the plates is protected by a coating of refractory bricks which are anchored in these ribs.

These cooling plates have several disadvantages.

On the one hand, their production is very expensive because the steel tubes intended for the circulation of the cooling water must be embedded in the mass of cast iron constituting the plate and must therefore undergo a special treatment. The cast iron for its part must have well-determined thermal conductivity and refractoriness properties.

On the other hand, the hot faces of these plates become thin quickly due to the progressive wear of the nerves. - 3 - vures. When the stripping occurs the face of the plates is exposed to temperature peaks between 800 and 1100 ° C until the reconstitution of self-protecting slag linings. However, cast iron plates can only withstand temperatures above about 800 ° C.

The object of the present invention is to avoid the drawbacks inherent in the boxes and cooling plates of industrial ovens, ie. to create cooling elements better suited to the specific stresses of industrial ovens, easier to produce, resulting in lower calorific losses.

This object is fully achieved in relation to metallic cooling elements carrying a lining of refractory material anchored on the surface, when these elements are formed entirely of metal of high thermal conductivity, such as for example copper and consist of a flattened body comprising at least one water circulation duct of substantially rectangular section, as well as a plurality of horizontal fins integral with said body, these fins having a width at least equal to that of said body, a height of at least three times that of said body, as well as a spacing equal to at least ten times the thickness of the fins.

This cooling system also constitutes a metal frame allowing good mechanical attachment of the refractory.

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According to an advantageous embodiment, the horizontal fins have a width greater than that of the body including the water circuit. In general this body extends vertically and the fins project from both sides.

It is also possible to provide two lateral fins and / or vertical ribs between the horizontal fins so as to form a kind of beehive.

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According to the known methods of execution, the fins can be given a more pronounced thickness at the end than at the base. Furthermore, the surface of the fins and of the body can be roughened or, above all, the body can be provided with attachment means to improve the adhesion of the refractory material filling the spaces delimited by the fins.

In addition, the cold side of the elements will be provided - usefully with supports for hanging on the armor of the furnaces to be filled. In this way the elements are immobilized with respect to the shielding and there is no risk of shearing of the anchoring pipes and evacuation of the water.

These elements can be molded from copper and their manufacture poses no particular technological problem.

Unlike conventional cooling plates, the elements according to the invention have only a very small exposed metal surface. Due to the very high thermal conductivity of copper, however, their cooling remains sufficiently high so that these elements can also be fitted in the lower zones of the tank without thereby exposing them to too pronounced or too rapid wear.

Furthermore the cooling in blades in the water circulation chamber allows a sufficiently efficient heat evacuation at low flow rates of the cooling water, the speed of this water always remaining sufficiently high at any point of the hydraulic circuit, due to the fact even the shape of this circuit.

The low heat transmission front of the metallic element in relation to the choice of a metallic material which is a very good thermal conductor and the configuration of the cooling chamber make it possible to achieve very judicious cooling. even very significantly improving the thermal efficiency of ovens fitted with elements according to the invention, due to the reduction in heat losses.

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In fact, the large compartmentalized extent of the elements according to the invention, with the aid of which the entire extent of the zones of the ovens to be protected is preferably provided, guarantees good mechanical attachment of the refractory. Furthermore, because of their thickness, a premature stripping is not to be feared. These factors contribute to maintaining a constant refractory profile, hence the low calorific losses.

* Examples of execution of cooling elements according to the invention are described below by way of illustration in relation to the drawings in which: FIG. 1 is a section through a cooling element for cupola in FIG. 2 is a top view of the same element Figure 3 is a plan view of a cooling element for blast furnace, and Figure 4 is a top view of the same element.

The cooling element for cupola furnaces illustrated in FIGS. 1 and 2 has on its hot face four compartments delimited by ribs and side walls with a height of the order of magnitude of 90-120 mm. These compartments are filled with a suitable refractory material, eg an adobe.

These elements are designed to fill especially the zone of maximum wear of cupolas.

The cooling element according to FIGS. 3 and 4 is formed by a cast copper casing which delimits a vertical flat water chamber equipped with water supply and evacuation pipes.

Fins secured to the box on three of its faces are arranged at equal distances. According to the illustration: - 6 - their width is approximately three times and their height approximately four times the corresponding dimensions of the box. Their thickness, which according to the illustration is uniform from the base to their end, is of the order of magnitude of 10 mm.

These elements, the dimensions of which are for example 1200 × 600 × 200, are normally put in place by the interior of the furnace during the construction thereof. This makes it possible to obtain monolithic refractory linings.

If, during the campaign, an element is accidentally destroyed and needs to be replaced, one or two fin elements may be inserted through openings provided or later fitted in the shielding, the width of which is equal to that of the box, the refractory being then formed by spraying or injecting suitable products.

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Claims (4)

1. Metal cooling elements for industrial ovens essentially consisting of a water cooling chamber externally carrying a refractory lining anchored on the surface, characterized in that they are »formed entirely of a metal with high thermal conductivity • like copper and that they consist of a flattened body including at least one water circulation chamber of substantially rectangular section, as well as a plurality of horizontal fins integral with said body, these fins having a width at least equal to that of said body, a height of at least three times that of said body and a spacing equal to at least ten times the thickness of the fins between 6 and 20 mm. 2. Cooling elements according to claim 1, characterized in that the horizontal fins have a width greater than that of the body and exceed the latter on both sides. 3. Elements according to claims 1-2, characterized in that the horizontal fins are interconnected by 'vertical side fins. 4. Elements according to claims 1-3, characterized in that between the horizontal fins are provided vertical ribs in beehives.