Process for burning lumps of material with lean gas

Details Process for burning lumps of material with lean gas Process for burning lumps of material with lean gas

2008-06-10

2008-06-10

Wilson, Gregory (Department: 3749)

Heating

Shaft type

Having combustion products generated in or fed to shaft

C432S096000

Reexamination Certificate

active

07384263

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 m3is 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.

REFERENCES:
patent: 4205459 (1980-06-01), Koseki et al.
patent: 6113387 (2000-09-01), Wilson et al.
patent: 6453831 (2002-09-01), Zeisel
patent: 390 248 (1990-04-01), None
patent: 44 46 007 (1996-06-01), None
patent: 196 47 442 (1998-05-01), None

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