Tubular heater for preparing carbon monoxide-containing gas mixtures
AssigneeMetallgesellschaft Aktiengesellschaft
InventorsFriedrich Hohmann, Werner Roll, Hans G. Mortel
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Abstract
The tubular heater comprises numerous tubes, which are disposed in a combustion chamber and contain catalyst. A synthesis gas, which mainly comprises hydrogen, carbon monoxide, and carbon dioxide, is prepared in the tubes. There is a risk of a formation of carbides (metal dusting corrosion) on the outside surface of the outlet ends of the tubes. To prevent such corrosion, a gaseous or vaporous protecting fluid, which is substantially free of CO, is supplied to the region surrounding the outlet ends of the tubes.
Claims7
A tubular heater for a catalytic cracking of hydrocarbons in order to prepare a raw synthesis gas which mainly contains hydrogen, carbon monoxide and carbon dioxide, which heater comprises a refractory housing containing a combustion chamber and heating means in said combustion chamber, a plurality of tubes being disposed in said combustion chamber, said tubes containing a catalyst, said catalyst being indirectly heated by said heating means, said tubes having supply means for supplying hydrocarbons and steam into said tubes, said tubes having outlet ends downstream of said catalyst, said outlet ends being disposed outside said combustion chamber through which raw synthesis gas flows, said outlet ends being connected to a collecting line for collecting said raw synthesis gas, the inside surface of said collecting line and the outside surface of said outlet ends being provided with a porous refractory lining, bell-shaped portions of the collecting line being connected to the outside of the least some of said outlet ends, each of said bell-shaped portions being provided with a supply line for supplying a gaseous or vaporous protecting fluid which is substantially free of CO to the outside surface of the outlet end of said portion and into the refractory lining.
In the method of producing synthesis gas by the catalytic cracking of hydrocarbons in a tubular heater, which tubular heater comprises a plurality of tubes passing through a combustion chamber, wherein the hydrocarbons are supplied to the inlet of said tubes, said hydrocarbons being converted to synthesis gas as they pass through said tubes, and exiting the outlet ends of said tubes, and wherein a fuel is burned in said combustion chamber to heat the gases passing through said tubes, and wherein the outlet ends of said tubes are disposed outside said combustion chamber, the improvement which comprises protecting said outlet ends of said tubes and the region adjacent thereto from metal dusting corrosion, by providing a gaseous or vaporous protecting fluid, which is substantially free of CO, to the outside surface of said outlet ends of at least some of said tubes.
Dependencies are inferred from the claim text.