Characteristics of pulverized-coal combustion in the system of oxygen/recycled flue gas combustion
Abstract
Concerning to the system of oxygen/recycled flue gas combustion for the removal of carbon dioxide from pulverized-coal firing power plants, combustion characteristics of pulverized coal and the heat absorption performance of boiler furnace were studied. To determine the ignition characteristics in the CO 2-rich atmosphere, the flame propagation speed of pulverized-coal cloud was measured in a microgravity combustion chamber. The results revealed that the flame propagation speed in an O 2 / CO 2 atmosphere was markedly low compared with that in O 2 / N 2 and O 2 / Ar , and that it was improved by increasing the O 2 concentration. NO x and SO 2 emissions from the system were investigated in the industrial-scale combustion test facilities. NO x emission was not so largely decreased by staging as air-blown combustion, while a considerable part of sulfur was absorbed in ash in the system. As for the heat absorption performance of the boiler furnace, a 3-dimensional numerical analysis was applied to a large utility boiler furnace. It was found that a furnace designed for normal air-blown combustion was just large enough for the oxygen/recycled flue gas combustion with a realizable ratio of flue gas recycling.
- Publication:
-
Energy Conversion and Management
- Pub Date:
- 1997
- DOI:
- 10.1016/S0196-8904(96)00258-0
- Bibcode:
- 1997ECM....38.S129K
- Keywords:
-
- CO <SUB>2</SUB> recovery;
- O <SUB>2</SUB> / CO <SUB>2</SUB> combustion;
- pulverized coal;
- combustion improvement;
- microgravity;
- oxygen-enriched combustion;
- burner;
- furnace;
- heat absorption