In situ desulfurization of pulverized coal
- Inst. for Chemical Processing of Coal, Zabrze (Poland)
The process combining dolomite addition to pulverized coal mild gasification with subsequent separation of spent sulfur acceptor and combustion of product gas and char has been investigated as a method of in situ desulfurization. The desulfurization is performed during the mild gasification of pulverized coal in a circulating fluidized bed reactor in its upper zone. The sulfur contained in coal passes to the gas phase, from which it is removed with high efficiency by circulating calcium acceptor of sulfur. The atmosphere in the bottom zone of the reactor is rich in oxygen and air treated spent calcium acceptor of sulfur is converted to a safely disposable form of CASO{sub 4}. During the process the tar decomposes, so that the product gas is free from it and after final cleanup and pressurization it can be directed to a gas turbine to enhance electricity generation efficiency. The experiments have been carried out in the Laboratory Unit (LU) and Process Development Unit (PDU) with capacity 150--250 kg/h. The relation between efficiency of desulfurization, temperature and Ca/S stoichiometric ratio has been investigated. Thermal and hydrodynamic process parameters suitable for stable operation of circulating fluidized bed reactor (CFBR) were defined in a long period runs of PDU. The long term project objectives are to demonstrate the feasibility of pulverized coal in situ desulfurization and to evaluate the economical, environmental and operational benefits of the process as an acceptable alternative to flue gas desulfurization methods.
- OSTI ID:
- 52016
- Report Number(s):
- CONF-940930--
- Country of Publication:
- United States
- Language:
- English
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