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A heat exchanger for simultaneously vaporizing a hydrocarbon fluid and water to produce a hydrocarbon fuel gas and steam includes a body member with a smooth surface axial bore having an enlarged end. The non-enlarged portion of the bore receives an elongated thick-walled sleeve having two separate

A heat exchanger for simultaneously vaporizing a hydrocarbon fluid and water to produce a hydrocarbon fuel gas and steam includes a body member with a smooth surface axial bore having an enlarged end. The non-enlarged portion of the bore receives an elongated thick-walled sleeve having two separate coextensive, interjacent, helical passages formed in its outer surface and positioned in liquid tight engagement with the inner surface of the bore. The first passage communicates with a water inlet and steam outlet at opposite ends of the body member. The second passage is of larger in cross section than the first and communicates at one end with a hydrocarbon fluid inlet on the body member adjacent the water inlet and at its other end with the enlarged bore portion, the latter having a hydrocarbon fuel gas outlet. An electric heating element is located within the sleeve and is controlled by a temperature sensor in the enlarged bore area in response to the temperature of the hydrocarbon fuel gas at the outlet therefor.

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A heat exchanger for simultaneously and separately producing hot fuel gas from a hydrocarbon fluid and steam from water comprising: (a) a body member having an axial bore defined therein, said body member including: (1) a smooth inner surface, (2) hydrocarbon fluid inlet means for conducting hydroca

A heat exchanger for simultaneously and separately producing hot fuel gas from a hydrocarbon fluid and steam from water comprising: (a) a body member having an axial bore defined therein, said body member including: (1) a smooth inner surface, (2) hydrocarbon fluid inlet means for conducting hydrocarbon fluid to be vaporized into said body member, (3) hydrocarbon fuel gas outlet means for conducting hydrocarbon fuel gas away from said body member, (4) an enlarged bore area adjacent to said hydrocarbon fuel gas outlet means and fluidly communicating therewith. (5) water inlet means for conducting water to be vaporized into said body member, and (6) steam outlet means for conducting steam away from said body member; (b) a fluid vaporizing means located in said axial bore for conducting hydrocarbon fluid and water from said inlet means through said body member and simultaneously and separately vaporizing the hydrocarbon fluid and water, said fluid vaporizing means including: (1) an elongated thick-walled sleeve positioned in said axial bore, (2) a heater means in said sleeve for producing sufficient heat to vaporize both of said fluids, (3) first heat transfer means for adding a first amount of heat to water passing into said body member including a continuous helical water passage means defined in the outer surface of said elongate sleeve for fluidically connecting said water inlet means to said steam outlet means and having a first heat transfer surface means in heat transferring relation with said heater means to transfer heat to water passing into said helical water passage for vaporizing that water, and (4) second heat transfer means for adding a second amount of heat to hydrocarbon fluid passing into said body member including a continuous helical hydrocarbon passage means defined in the outer surface of said sleeve fluidically connecting said hydrocarbon inlet to said bore enlarged area adjacent to said hydrocarbon gas outlet, said helical hydrocarbon passage means being coaxially coextensive with said helical water passage means and interjacent therewith and having a second heat transfer surface means in heat transferring relation with said heater means and being larger than said first heat transfer surface means to transfer more heat from said heater means to said hydrocarbon fluid than is transferred to said water for transferring sufficient heat from said heater means to hydrocarbon fluid passing into said hydrocarbon helical passage to vaporize that hydrocarbon fluid into hydrocarbon fuel gas whereby the same heater means is used to both vaporize water into steam and hydrocarbon fluid into hydrocarbon fuel gas separately and simultaneously in the same body member; and (c) a temperature sensing means in said bore enlarged area for controlling energy supplied to said heater means in response to the temperature of said hydrocarbon fuel gas at said outlet means.