Abstract:
There is provided a hydrogen generator that prevents supply of droplets to a reforming catalyst layer and that exhibits stable performance.The hydrogen generator includes a water evaporation unit 7 to which a raw gas and water is supplied; a reforming catalyst layer 9 to which a gas mixture is supplied from the water evaporation unit 7; a burner 4 configured to mix and combust a fuel gas with air; a combustion exhaust gas flow channel 16 which is provided on an inner side of the water evaporation unit 7 and through which the combustion exhaust gas flows; and a conversion catalyst layer 10 which is disposed on an outer side of the water evaporation unit 7 and to which a reformed gas is supplied. The water evaporation unit 7 includes double cylinders 100 and 101 and a helical round bar 18 sandwiched between the cylinders 100 and 101, and a pitch of the helical round bar 18 in a downstream portion of the water evaporation unit 7 is made smaller than a pitch of the helical round bar 18 in a portion of the water evaporation unit 7 except the downstream portion thereof.
Abstract:
An ammonia converter is disclosed. The converter can alter the conversion of ammonia by controlling the reaction temperature of the exothermic reaction along the length of the reactor to parallel the equilibrium curve for the desired product. The converter can comprise a shell 101 and internal catalyst tubes 109. The feed gas stream enters the reactor, flows through the shell 101, and is heated by indirect heat exchange with the catalyst tubes 109. The catalyst tubes 109 comprise reactive zones 122 having catalyst and reaction limited zones 124 that can comprise inert devices that function to both separate the reactive zones, increase heat transfer area, and reduce the temperature of the reaction mixture as the effluent passes through the catalyst tube 109.
Abstract:
The present invention describes an exchanger-reactor for carrying out endothermic reactions, comprising a shell inside which a heat transfer fluid moves, said shell enclosing a plurality of tubes inside which the reactant fluid moves, the tubes being of the bayonet type, and the reactor not having a tube plate. This reactor may operate with a pressure difference between the tube side and the shell side which may be up to 100 bars.
Abstract:
A radial chemical reactor (10, 110, 210, 310) for catalytic reactions comprising: a substantially cylindrical shell (12), a first catalytic bed (18) having a substantially ring shaped cross-section, coaxially supported in said shell (12) and having a reagent gases inlet side (20) and a reaction mixture outlet side (21); a plurality of heat exchangers (22) supported and distributed in a substantially ring-shaped respective portion of said first catalytic bed (18); at least one second catalytic bed (28) with a substantially ring-shaped cross-section, supported in said shell (12) coaxially to said first bed (18) and at a predetermined distance from said first bed, said second catalytic bed (28) having a reaction mixture inlet side (30) and a reaction gaseous products outlet side (31); a plurality of heat exchangers (32) supported and distributed in a substantially ring-shaped respective portion of said second catalytic bed (28).
Abstract:
An apparatus for steam reforming of hydrocarbons comprises a heat exchange reformer having disposed within a plurality of vertical catalyst-filled tubes, through which a gas mixture comprising hydrocarbon and steam may be passed, and to which heat may be transferred by means of a heat exchange medium flowing around the external tube surfaces, wherein heat exchange adapting means are provided within the reformer so that the tubes have a zone of lower heat exchange extending from the bottom of the catalyst up to 25% of the catalyst depth with no heat exchange enhancement means provided in that zone. A process for steam reforming of hydrocarbons employs this apparatus.
Abstract:
A catalyst conduit for a catalytic reactor of a turbine combustor, the conduit comprising a tube including an inlet and an outlet, and a wall with an interior surface and an exterior surface. The tube contains a variation in its cross sectional area along at least a portion of its length to change a property of a fluid flowing adjacent the wall of the tube. An oxidation catalyst is deposited on at least a portion of the tube.
Abstract:
A reformer of a fuel cell system is provided. The reformer includes a reforming reaction section constructed with a plurality of pipelines having independent internal spaces to generate hydrogen from a fuel, and a housing assembly surrounding the reforming reaction section to circulate the fuel around an outer surface of the reforming reaction section to preheat the fuel before it is supplied to the reforming reaction section.
Abstract:
An apparatus for steam reforming of hydrocarbons comprises a heat exchange reformer having disposed within a plurality of vertical catalyst-filled tubes, through which a gas mixture comprising hydrocarbon and steam may be passed, and to which heat may be transferred by means of a heat exchange medium flowing around the external tube surfaces, wherein heat exchange adapting means are provided within the reformer so that the tubes have a zone of lower heat exchange extending from the bottom of the catalyst up to 25% of the catalyst depth with no heat exchange enhancement means provided in that zone. A process for steam reforming of hydrocarbons employs this apparatus.
Abstract:
The invention relates to a method and device for the direct production of polyester granulate from a highly viscous polyester melt with a polymerisation degree of 132 to 165, as well as the granulates formed thereform. In the method, the highly viscous polyester melt is subjected to a pre-drying and drying/degassing after a hot cutting method. Hot cutting is implemented at water temperatures of 70° C. to 95° C. and with a liquid to solid ratio of 8 to 12:1.
Abstract:
The present invention provides an epoxidation reactor system for preparing an olefin oxide comprising: one or more purification zones comprising one or more purification vessels containing an absorbent comprising copper and zinc; and a reaction zone comprising one or more reactor vessels containing an epoxidation catalyst, wherein the reaction zone is positioned downstream from the one or more purification zones; a process for preparing an olefin oxide; and a process for preparing a 1,2-diol, a 1,2-diol ether, a 1,2-carbonate, and an alkanolamine.