| 摘要 |
1,202,878. Steam reforming methane. JOHN ZINK CO. 15 Dec., 1967 [15 Dec., 1966], No. 57191/67. Heading C5E. Effluent at 1500‹ F. from the conversion of methane to carbon monoxide and hydrogen by reaction with steam in a primary reformer is passed through the inlet 19 to the neck portion 14 of the housing of a combination chamber 12 of a secondary reformer. Sufficient air or air and steam at 300-1100‹ F. to heat the effluent to 2200‹ F. after combustion so that complete conversion of residual methane is obtained in the catalyst bed is passed down the conduit 21 and through the openings 27 in the burner head 22 (Fig. 4, not shown). A cylindrical jacket 31, spaced from the conduit 21 by a refractory lining 32, protects the conduit 21 from the heat of the incoming effluent. The jacket 31 carries an annular member 33 having holes 37 therethrough (Fig. 2, not shown) such that the area of the holes 37 plus that of the annular space 34 is about 1À5 times that of the inlet opening 19. The member 33 reduces the momentum of the incoming effluent and provides for its non-turbulent flow past the burner head 22. Fig. 5 shows an apparatus in which, instead of the annular member 33 shown in Fig. 1, a cylindrical shroud 46 is disposed about the conduit 21. This shroud 46 is closed at its upper end 47 and its lower end is open and has an outside diameter which fits within the refractory lining at the entrance to the chamber 12. Two diametrically opposed openings 48 are provided in the shroud through which the incoming effluent passes with decreased momentum and suppressed turbulence as it moves down between the shroud 46 and the conduit 21. |
