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Extra info for Design, Eval of Heat Utiliz Systems - High-Temp Engineering Test Reactor (IAEA TECDOC-1236)

Example text

Methanol is a clean synthetic fuel and chemical stock. 8 kcal / mole Today, low-pressure (<10 MPa) and low-temperature (220-270°C) commercial methanol synthesis are available, based on a Cu/ZnO/Al2O3 catalyst. 5% conversion is obtained. Since the ratio of H2/CO is 1:1 for the product of the reaction of CO2 reforming of CH4, it has to be adjusted to the ratio of 2:1 for methanol production. In the case where, for instance, feed stock from Natuna gas is used, it is necessary to balance the stoichiometry with water, for example: CH 4 + 2 3 CO2 + 2 3 H 2 O ® 4 3 CH 3 OH Methanol itself can be a precursor to the production of fuel additives like MTBE or synthetic gasoline, as well as other important chemicals, such as formaldehyde, acetic acid, etc.

A steam/methane reforming system has the advantages as described below: 1) It is highly possible to couple the steam reforming system to the HTTR in the early 2000's because a fossil-fired steam reforming of natural gas (methane) or naphtha is an economical and mature technology for production of hydrogen in the chemical industries. 2) Technical solutions demonstrated by coupling the steam reforming system to the HTTR will contribute to other nuclear-heated hydrogen production systems. 3) Nuclear-heated steam reforming is a practicable means for producing hydrogen because of pre-combustion removal of CO2 from hydrocarbon resources, such as natural gas and coal, and has significant potential as a method to facilitate the transition from fossil fuels to future hydrogen energy systems [6].

1. FIG. 1. HTTR steam reforming hydrogen production system diagram. 27 JAERI has been studying application of the HTTR for this process in order to demonstrate industrial capabilities for the use of nuclear heat. The current schedule for testing of the steam reforming hydrogen production process coupled to the HTTR is 2007. Key development achievements include the design of a new concept of steam reformer using a bayonet type catalyst tube, a natural convection type of steam generator integrated with a natural ventilated air cooler and basic safety design criteria for accidents involving fire and explosion originating at the steam reforming plant.

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Design, Eval of Heat Utiliz Systems - High-Temp Engineering Test Reactor (IAEA TECDOC-1236)


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