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3 OPPORTUNITIES-BARRIERS-PATHWAYS FOR RECOVERY Coupling CO2 reforming and steam reforming can yield syngas with the desired H2/CO ratio for methanol and Fisher-Tropsch synthesis, which require a 2:1 H2/CO ratio, while steam reforming gives a 3:1 ratio. At present, two industrial processes (SPARG, Calcor) use this process. It should be noted that with CO2 reforming of methane, carbon formation is a big issue. Coupling with steam reforming mitigates this problem. In addition, introduction of air for partial oxidation of methane is also coupled with the above two processes to take advantage of the exotherm provided by the partial oxidation process. Any carbon formed is also oxidized. While tri-reforming has some disadvantages with respect to use of flue gas due to presence of various toxic substances, it appears to be a good candidate for emissions with CO2 and CH4 present in them. Zhou et al. [26] investigated the use of dielectric-barrier discharge to convert CH4 and CO2 to synthesis gas at a low temperature and ambient pressure. For CH4:CO2 ratio of 20:80, a low H2/CO molar ration was obtained, while for CH4:CO2 ratio of 80:20, H2:CO ratio > 3 was obtained. This eliminates the need for separation of CO2 from the flue gas and produces a valuable end product (synthesis gas). 75PDF Image | Analysis for Recovering Energy from Industrial Waste Heat
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