Abstract
A new, very high temperature solar energy conversion technique which offers the potential of increasing the throughput and decreasing the cost of solar thermal coal gasification is described. Feedgas (CO 2 or steam) is heated to very high temperatures in a direct-contact droplet heat exchanger using slag droplets melted in a solar central receiver. The heated feedgas is then reacted with coal in conventional reaction vessels. Thermal storage at the full thermodynamic potential of the solar receiver is an integral feature of this approach and permits operation of the gasifier at full capacity during periods of no sun.
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