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Coal alkali retention in a slagging combustor

1992; Elsevier BV; Volume: 71; Issue: 2 Linguagem: Inglês

10.1016/0016-2361(92)90012-d

1873-7153

C.S. Wen, L. H. Cowell, F.J. Smit, Jeff D Boyd, R.T. LeCren,

Thermochemical Biomass Conversion Processes

Combustion tests and laboratory experiments were conducted to study the coal alkali retention and volatilization in the slagging combustor. The test results have indicated that 45–64% of alkali introduced in the coal feed were retained with slag in the fuel-rich primary combustion zone. The laboratory alkali volatilization study further suggested that the vapour phase alkalis are only present in significant concentration at temperatures above 1204 °C (2200 °F). Less than 50% of sodium and 30% of potassium are released from coal over the operating temperature range of 1427–1538 °C (2600–2800 °F) found in slagging combustors. Cleaning coal with hot water and dilute acid removed water-soluble alkalis and lowered the volatilization of sodium from 49 to 20% and potassium from 19 to 4% at temperatures up to 1538 °C (2800 °F). Inactive alkalis of coal stay with thermally degraded clays after combustion.