US1140908A - Casing for downdraft-furnaces. - Google Patents

Description

KARL PRINZ ZU LWENS'EIN.

CASlNG FOR DOWN DRAFT FURNCES.

` APPLICATION FILED JULY 18. 1913- l IQQQSG Patented May 25,- 191.5a

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CASING FOB Macnee. l

Specication of Iietters Patent.

RMT-FURNACES.

Araten-.ea may 25,1915.

applicati@ inea July 1s, 1913; serial nu. 779,824. 1

To all whom t may concern:

Be it known that I, KARL PRINZ ZU LwnNs'rnIN, a citizen of the German Em'- pire, residing' at Neckargemnd, in the GrandDukedom of Baden, Germany, have invented certain new and useful Improvements in Casings for Downdraft-Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention has for its object a frame or casing for the rebrick masonry of the combustion chambers of furnaces with a bottom Hue. The casing enables very thin masonry to be employed in order to reducey as -far as possible the weight of the apparatus.

The furnace shell must, in order to avoid too rapid a destruction of the thin flrebrick lining, prevent the masonry becoming too highly heated, that is to say, must cool it,

utilizing the heat withdrawn. Further, the casing must also be able to absorb the heat flowing through the masonry, in order that loss of heat may not take place. The casing itself must also be of rigid construction, and afford themasonry built in it a secure hold and a good anchorage, and it must also be simple in construction', cheaply made, andl quite safe, so that on any portion of the casing becoming defective no danger is involved in working the apparatus. Finally, the casing must be durable in working, that is to say it must not become stopped with boiler scale in' a short time, which would prevent a circulation of the cooling fluid.

The tubular frame or casing according to this invention entirely fulfils the above-mentioned requirements, and for this purpose consists of` a number of continuous pipes arranged close together, in which pipes the same liquid constantly circulates.

The pipes may be combined into groups composed ofany suitable number of pipes, each tubular elementbeing connected bylan up and down pipe with a cooling coil or the like which is located in a steam-boiler or other cooling vessel and by means of which the heat absorbed from the (pipes of the casing or frame is transmitte to the cooling vessel and made available in the latter.

The invention will now be more particularly described with reference to the accompanying drawings in which one form of construction is illustrated as an example.

F1gure 1 is a longitudinal section of a furnace flue provided with the improved casing or shell, number of the pipes being combined into o ne tubular element; Fig. 2 is a cross section of the furnace Hue; while Fig. 3 is a perspective view of the arrangement of the shell. p

The furnace flue a is lined with a thin layer of re brick masonry b, and this masonry, according to' this mvention, is surp rounded by a casing or frame consisting of a number of continuous pipes c lying closely together. IThe separate pipes may be com'- bined. in any suitable number to form tubular elements in which the same cooling liquid constantly circulates. This absorbs the heat passing -through the masonry b and thus cools the latter. The heated liquid rises through the pipe dand flows through a cooling coil f placed in a steam boiler g or the like, to the water ofl which it imparts its heat.

The cooled liquid Hows back again to the same tubularelement through the down pipe e inorder to re-commence the same circulation. The combination of a number of pipes into a tubular element has the advantage of a considerable saving of wei 'ht and a cheaper construction ofthe cooling portion of the tubular element, and further a considerable stiffening ofthe element itself is obtained, whereb the irebrick masonry built therein obtalns a secure hold.

The way in which the pipes are combined with one another to form tubular elements and also the particular construction of the cooling arrangement is immaterial as regards the essential feature of the invention.

I declare that what claim is 1. In a water-cooled furnace, the combination of a thin lining of refractory brick masonry; a plurality of'closely spaced pipes surrounding said lining in contact therewith; upper and 'lower conduits above and below said linin and connecting the pipes in groups; a circulation pipe connecting each upper conduit with the corresponding lower conduit; and a heat exchange device associated with the circulation pipe.

2. In a water-cooled casing for refractory masonry for furnaces, the combination of a plurality of groups of pipes lying close together; conduits connecting one group of pipes with another; and a heat exchange de-v vice in the conduits.

3.' In a waterv'cooled lfurnace, the combination of a thin lining of refractory material; a plurality of closely spaced water conducting pipes surrounding said lining in contact therewith and a heat exchangecde- Vice connected with said pipes.

4. In a water-cooled furnace, the cohibination of a thin lining 'of refractory material; and a pluralityl of closely spaced water conducting pipes surrounding said lining in contact therewith, said pipes and device forining a closed system through which the same water circulates repeatedly. 15 In testimony whereof I aHX my signature,

in presence of two witnesses.

, KARL PRINZ zu LWENSTEIN.

Witnesses WALTER SCHWARBACH, PAULINE MILER.

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