| 摘要 |
<PICT:0982650/C4-C5/1> A furnace for the catalytic steam reforming of hydrocarbons comprises a combustion chamber 17 defined by walls 21, roof 18 and floor 19, a plurality of vertical tubes 27 extending through the roof 18 and being adapted to contain a catalyst and to receive fluid reactants at their upper ends, e.g. from headers 29 through hose 31, headers 28 in the chamber 17 connected to the lower ends of the tubes 27, and transfer means 33 connected to the headers 28, e.g. by risers 32. Each header 28 is closed at both ends and is connected to a row of tubes 27 (see Fig. 1, not shown), each header having one riser 32. Each tube 27 is resiliently, and preferably adjustably, supported at its upper end, e.g. by tension or compression springs (see Fig. 5, not shown). The means 33 may lead to a point of use or to a secondary reformer for reaction with steam and air using a catalyst. Several modifications are described. In one, the means 33 lies underneath the chamber 17. In another, Fig. 4 (not shown), the riser is at one end of the header 28, each riser leading to a common horizontal manifold in the top of the chamber 17. In a third, Fig. 3 (not shown), the headers 28 are connected at one end to a common horizontal manifold which has a single riser, and in a fourth, the manifold lies centrally of the chamber 17 in the plane of the headers 28, passing through the flue gas ducts 23. |
