US1993283A - Shield for furnace tubes - Google Patents

Description

Patented Mar. 5, 1935 'f 3. l l

UNIT-ED:

1,993,283 V SHIELD FOR FURNACE TUBES George Potts, Hillside, N. J., assignorto Standard Oil Development Company, a, corporation of Delaware u Application May-5, 1931, Serial No. 535,195 Y 3 .Claim (Cl. 196-116) This invention relates Vto improvements i in by such beams is convenient but it will be undermeans for protecting the tubes of a tube still,"V stood that any other equivalent trough-like artubular reaction chamber, or the like,V from the rangement may be used forthe same purpose. A adverse effect of excessive radiant heat. In a variety of heat insulatingmaterials may be used.

5 preferred embodiment of the invention the 'tubes Fragments of fire-brick, powdered clay or the 5 are protected by placing over them a shielding like are suitable? v structure, preferably oi thenature of I-beams, While the protective means have been illusin such manner as to intercept the radiant heat. trated only in Vconnection 'with the top row of A furtherV object of the invention is to secure tubes, it is obvious that other Vtubes' could be 1 0 the stated Vprotection without substantially. imsimilarly protected if desirable.` Ordinarily the 10 pairing the heat input from convection. toprow is the only one which is likely to receive The invention will beiully understood from excessive heat radiation. With the construction the following description, Yready in connection with described it is possible to obtain all the desired the accompanying drawing, in which heating eiect by convection without overheating Fig. 1 is a vertical sectionthrough a furnace the tubes by radiation. It will be observed that 15 in which the upper bank oftubes in the convecthe combustion gases passl freely around all the tion section is protected by I-beams, tubes in the convection section. I am aware that Fig. 2 is a longitudinal Vsection `taken on the beams have been used adjacent tubes to transline 2 2 of Fig. l, and mitradiant heat thereto and obstruct convection Figs. 3 and 4 are enlarged perspective views of heat. The present invention has an Opposite 20 Y tubes and alternative forms of protective means. UIICOD, aS described.

Referring rst to Figs. 1 and 2, reference nu- In Fig. 3 analternative form of tube shield'is :neral 1 denotes a furnace setting which may be illustrated. This comprises a flat metallic bar of any suitable kind. Typical installations to 10 carrying on-its upper surface a thick Vlagging which this invention are applicable include 11 of heat insulating'material. The device shown 25 lcracking coils, high temperature tube stills, tubuin Fig. 4 is a trough-like metallic member 12 lar hydrogenation units and the like. In general which may be lled with vclay 12' or the like. the invention is applicable wherever extremely Various means have been proposed heretofore high temperatures are generated and applied to OI preVelltmg TadiatiOn fIQm the upper Wall 01 liquids or gases flowing through tubes. In theV arch of the furnace but such means have not 30 setting illustrated there is the usual bankvof tubes given uniformly Satisfactory SGIVCB in 0011116@- 2 arranged in the radiant heat section 3 of the tion with very high temperature ODBIBJODS, T01 furnace l. A bank of tubes a isinstalle'd in a example where the temperature of the convection chamber 5 which receives the hot combustion section'is 1800 F. or more. In such situations gases from chamber 3 through the flue 6. y the shielding device of the present invention gives 35 n The upper wall 7 of chamber 5 may be heated ample protection without decreasing the emciency to incandescence by the combustion gases. The of the furnace. heat from this Wallis radiated downwardly and Various changes and alternative arrangements would cause the tubes in the upper row of bank may be made within the scope of the appended 40 4- to reach too high a temperature. This is preclaims in which it is my intention to claim all 40 -vented by placing over these upper tubes a series novelty inherent in the invention as broadly as. of metallic protecting structures which are most the prior art permits. conveniently in the form of I-beams 8. These I claim:k 1 1 I-beams are supported at several points inter- 1. A hightemperature furnace comprising a mediate their ends by hangers 9, which pass radiant heat section and a convection heat seci5 through the top of the chamber 5. The ends of tion, tubes in both said sections, means for prothe Lbeains are received in openings in the side tecting the upper tubes in the convection section walls of chamber 5, and these openings are filled from radiant heat, said means comprising a with asbestos wall 5l or other similar material shielding element arranged between each of the which will permit the -beam to expand and conupper tubes andthe adjacent radiant surface in 50 tract. y the convection section, and Vheat insulating ina- In order to increase the protective action of the terial carried by each of said shielding elements. structure described it is preferred to place a heat 2.' The improvement in the process of destrucinsulating material 8 inthe upper portion of tive hydrogenation of carbonaceous materials,

A each I-beam. The channeled structure provided which comprises passing hot gases into a cham-Y 55 ber adjacent an arch in the chamber which throws out radiant heat, passing the carbonaceous materials in the presence of hydrogen through spaced rows of tubes, and independently shielding each of the tubes adjoining the arch from the radiant heat of the arch While permittingl free passage of gases to the tubes.

3. In'combination with furnace tubes arranged adjacent to a source of radiant heat, a protective structure adapted to decrease the transmission of radiant heat to the tubes, said structure comprising a plurality of lshielding elements in the form of I-beams placed on their sides so as to form an upper channel, heat insulating material in said channels, means for suspending the I-beams at points intermediate their ends so that they run parallel with and overlie the respective tubes between the same and the source of radiant heat, and means for mounting the I-beams for expansible movement at their ends.

GEORGE POTTS.

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