Performance Results With ALSTOM’s Circulating Moving Bed Combuster™

Abstract

ALSTOM is developing and testing a new and more efficient coal combustion technology, including a new type of steam generator known as a “circulating moving bed (CMBTM) combustion system combustor.” The CMBTM combustion system technology involves a novel method of solid fuel combustion and heat transfer. In this design, a heat exchanger will heat the energy cycle working fluid, steam or air, to the high temperature levels required for advanced power generation systems. This will produce a step change in both performance and capital costs relative to today’s pulverized coal and fluid bed boiler designs. In addition to high temperature Rankine cycles, the CMBTM combustion system is an enabling technology for hydrogen production and CO2 capture from combustion systems utilizing innovative chemical looping airblown gasification and syngas decarbonization. ALSTOM’s 3MWth Multi-Use Combustion Test Facility has been modified to allow operation in CMBTM combustion system mode. This paper summarizes the results of this program, which includes performance results from pilot plant testing. Participants include the U.S. DOE, ALSTOM, the University of Massachusetts, and the Massachusetts Institute of Technology. The total program cost is $2,485,468 with the DOE’s National Energy Technology Laboratory (NETL) providing 60% of the funding under Cooperative Agreement No. DE-FC26-01NT41223.

Greenhouse Gas Emissions Control by Oxygen Firing in Circulating Fluidized Bed Boilers: Phase Ii--Pilot Scale Testing and Updated Performance and Economics for Oxygen Fired CFB With Co2 Capture

“…• In the External Heat Exchanger, circulating solids are cooled before returning to the furnace. This is typically a Fluidized Bed Heat Exchanger, but may also be a Moving Bed Heat Exchanger (Jukkola, et al, 2003). • In the Convective Pass after the cyclone, the flue gas and fly ash are cooled by tube banks.…”

“…Because of the very large heat duty of the external heat exchanger of Updated Case-2 (about 68 percent of the total duty as compared to about 20 percent for Case-1) a moving bed design was selected based on cost considerations. This moving bed type of external heat exchanger is currently under development by ALSTOM (Jukkola, et al, 2003). The Case-1 external heat exchanger was a traditional bubbling fluidized bed design.…”