Method for producing export steam in steam reform systems

The production of water steam in steam reforming process for converting hydrocarbon, comprises superheating and/or evaporating water consisting process condensate or its mixture and degassed- and demineralized pure water in heat exchanger against cooling and/or quenchable material stream for generating process steam, and evaporating the pure water for generating export steam. The process steam is used completely in the steam reforming process while the export steam is used externally. The pure steam in the heat exchanger is superheated against hot exhaust fumes. An independent claim is included for a device for the production of water steam in steam reforming process.