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Primary Examiner: Sofer, Jack
Assistant Examiner:
Attorney: Howson and Howson

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Title: Vertical tube type cracking furnace

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Claims: I claim:

1. A vertical tube type cracking furnace for cracking a process fluid, comprising:

a combustion chamber;

a plurality of vertical reaction tubes suspended in a straight row along a central portion of said combustion chamber;

burner means on opposite side walls of said combustion chamber for heating said reaction tubes in said combustion chamber;

heat-resistant walls defining a suspension chamber above said combustion chamber isolated from the combustion gases;

suspension means in said suspension chamber for suspending said reaction tubes;

a convection-heating chamber means positioned above said suspension chamber for pre-heating said process fluid;

fluid connection means extending from said convection-heating chamber means to said reaction tubes; and

exhaust gas passage ways surrounding said suspension chamber on at least two sides thereof and connecting said combustion chamber to said convection-heating chamber means, said gas passage ways being substantially symmetrical, a vertical plane extending through said row of tubes and with respect to said combustion chamber and said convection chamber means, whereby exhaust gas flows serially therethrough without passing laterally across said tubes and suspension means.

2. The furnace of claim 1, in which said combustion chamber, said suspension chamber and said convection-heating chamber means are disposed one directly above the other in the last-stated order and symmetrically about said plane.

3. The furnace of claim 1, in which said heat-resistant walls of said suspension chamber provide at least one wall of said gas passages.

Other info:

Inventors: Nakase, Noriaki (Nagano, JA)
Nagamine, Yoshiaki (Osaka, JA)

Application Number: 451924
Filing Date: 1974-03-18
Publication_date: 1976-03-30
Assignee: Mitsui Shipbuilding & Engineering Co. Ltd. (Tokyo, JA)
Primary Class(es): 196/110 196/116
Other Classes:
US Patent Ref:

2598840	Jun, 1952	Schutte	196/110.
2964033	Dec, 1960	Throckmorton et al.	122/356.
3172739	Mar, 1965	Koniewiez	23/288.
3215502	Nov, 1965	Korwin	196/110.
3274978	Sep, 1966	Palchik et al.	122/356.
3361538	Jan, 1968	Hess	196/110.
3385269	May, 1968	Breckenridge	122/356.
3512506	May, 1970	Von Wiesenthal	122/356.

Other Refs: Other References: Heat Engineering, "Simplifed Vertical Heater", May-June 1949, Vol. XXIV, No. 3, pp. 45-47.