Cost-effective carbon dioxide separation from a natural gas-to-hydrogen based power plant
GTI has piloted a 20,000 SCFD (51 kg/day) compact hydrogen generator (CHG) with an inherent capability for carbon dioxide (CO2) separation. The system is a cost-competitive, steam-neutral alternative to traditional steam methane reforming (SMR). It also produces a higher-quality hydrogen stream (>90%) while eliminating the need for a water gas shift reactor. Furthermore, it also eliminates the costly amine system to separate the CO2. The CHG patented process is a practical embodiment of sorption enhanced reforming (SER) because it continuously flows solid CO2 sorbent into and out of a fluidized bed reactor, thus effectively separating the CO2 from the hydrogen (H2). This eliminates the associated capital expenditure and operating expenses of amine-based systems required for CO2 capture from SMR and natural gas combined cycle (NGCC)-based power systems.
The concept for a 5MMSCFD (12,750 kg/day) modular demonstration plant has been defined and costs estimated for its construction and operation. The design is scalable to very large H2 production rates (e.g., 100MMSCFD [255,000 kg/day]) with the attendant economies of scale, with single or multiple modules. Because the system has a byproduct of essentially pure CO2, the CHG offers a cost-effective approach for pre-combustion carbon capture for a combined cycle power plant.
GTI performed a preliminary evaluation of a commercial power plant using four different scenarios. Using the CHG for carbon capture will increase the cost of electricity by 30%, making it the lowest cost carbon capture technology. The use of an advanced H2 turbine will further reduce costs.
Learn more about the compact hydrogen generator (1MB pdf)