Hydrogen decomposed turbine system for carbon recovery

摘要

We have been studying about the new power generation systems for CO{sub}2 recovering based on combined cycle named Hydrogen Decomposed Turbine Systems/HYDET. In these systems the natural gas is reformed and hydrogen is decomposed simultaneouslyfrom reforming gas by using membrane reformer which composed of both the reforming catalyst and the hydrogen separation membrane. The residual gas including CH4 and CO is combusted at the after burner with pure oxygen, and high concentration CO{sub}2 isexhausted directly. These systems apply the high temperature inorganic hydrogen separation membrane such as multi4ayers porous ceramic membrane. HYDET System I has the membrane reformer at combustion chamber. The performance of System I reaches 50% HHV at the sending end by the effect of recupering gas turbine cycle. CO{sub}2 recovery will depend upon permeability of the membrane, theoretically it will be 100%. And by using CO{sub}2 liquefaction equipment of LNG cold heat exchanger, liquid CO{sub}2 will be recovered with extra high efficiency. To apply these systems, key technology is the development of the high temperature inorganic hydrogen separation membrane.We have been studying about the new power generation systems for CO{sub}2 recovering based on a combined cycle named Hydrogen Decomposed Turbine Systems/HYDET. In these systems the natural gas is reformed and hydrogen is decomposed simultaneously fromreforming gas by using membrane reformer which composed of both the reforming catalyst and the hydrogen separation membrane. HYDET System II has the membrane reformer in the heat recovery steam generator. In this system. gas turbine exhaust heat can beused for both reforming reaction and production of steam. The net efficiency, therefore, becomes over 50% HHV, which is higher than that of System I. CO{sub}2 recovery ratio depends upon selectivity of the membrane and the cost will be affected by thepermeability of membrane. To apply these systems. key technology is the development of the high temperature inorganic hydrogen separation membrane.