TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Device: The heating zone is defined by a firebox of the reformer. The heating zone includes heat exchange surfaces to allow heating of boiler water to increase steam production. The installation includes a heat exchanger to exchange heat between hot combustion gas from the heating zone and boiler feed water fed to the waste heat boiler and/or steam produced by the waste heat boiler. The discharge arrangement is configured to pass the cooling or heat transfer medium to the waste heat boiler for indirect heat exchange with boiler water in the waste heat boiler, thus cooling the cooling or heat transfer medium. The installation includes a hydrogen generating unit to produce hydrogen or hydrogen enriched stream from at least a portion of the synthesis gas.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The method involves: drying or superheating the steam prior to passing the steam through some of the reforming passages as cooling or heat transfer medium (where the steam is dried or superheated in indirect heat exchange relationship with hot combustion gas from the reformer of the secondary process); feeding a hydrocarbonaceous gas and process steam into the reformer to pass together through some of the reforming passages only (the process steam is steam generated in the secondary process and is the same steam from which the steam for use as cooling or heat transfer medium is obtained); hot synthesis gas exiting the reformer of the secondary process is cooled by heat exchange in a waste heat boiler supplied with boiler feed water; heating the boiler feed water in indirect heat exchange relationship with the hot combustion gas from the reformer of the secondary process, before feeding the boiler feed water into the waste heat boiler; increasing steam production by transferring heat from the cooling or heat transfer medium to water and allowing the water to flash to produce steam; switching some reforming passages from receiving steam and a hydrocarbonaceous gas, to receiving the cooling or heat transfer medium only, so that some of the reforming passages are used to catalytically endothermically reform the hydrocarbonaceous gas and some reforming passages are only cooled by the cooling or heat transfer medium and thus do not produce any synthesis gas; switching some reforming passages from receiving a cooling or heat transfer medium only, to receiving steam and a hydrocarbonaceous gas, thus increasing the production of synthesis gas and decreasing the production of steam in the secondary process. The method involves increasing the synthesis gas production and hence the hydrogen feedstock production by using more reforming passages for synthesis gas production as the hydrocarbonaceous gas conversion plant comes online; initially generating maximum steam by using reforming passages not used for synthesis gas generation, to transfer heat from the heating zone into the steam generation circuit (this includes passing a heat transfer medium through the reforming passages, thus heating the heat transfer medium and transferring heat from the heated transfer medium to the water in the steam generation circuit to produce more steam). The primary process includes a Fischer-Tropsch hydrocarbon synthesis process to synthesize higher hydrocarbons from the synthesis gas produced by the primary process.