Process for burning lumps of material with lean gas
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United States of America Patent
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Jun 10, 2008
Grant Date -
Dec 21, 2006
app pub date -
Mar 22, 2004
filing date -
Jun 3, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for burning lumps of material, in particular limestone, is carried out in a regeneration shaft kiln (3) with at least two kiln shafts (1, 2) interconnected by an overflow line (19) and in which the material to be burned passes through an upper pre-heating zone (8), a central combustion zone (18) and a lower cooling zone (14). Combustion gas with a low calorific value of less than 7.5 megajoules (MJ) per m.sup.3 is periodically and alternately supplied to each of the shafts (1, 2) through burner lances (9, 25) after being pre-heated by heat exchange with process gas of the combustion process. The combustion gas is pre-heated in a heat exchanger (21) and/or by means of a surface of the burner lances (9, 25) which extend through the pre-heating zone (8), said surface being enlarged to enhance heat exchange.
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