Method for the desulfurization of flue gas of a firing system
AssigneeKlockner-Humboldt-Deutz Aktiengesellschaft
InventorsAlbrecht Wolter, Horst Herchenbach
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Abstract
A method for the desulfurization of a calcium containing flue gas stream from a firing system such as a cement making plant wherein at least partially deacidified, hot raw cement meal is added to the flue gas at selected points to absorb the sulfur oxides to the calcium present in the gas. The preferred form of the invention comprises suspending the deacidified raw cement meal in the flue gas in the form of a cloud of airborne dust, and thereafter separating the dust from the flue gas after the sulfur oxides have been bonded to the calcium.
Claims8
A method for the desulfurization of a flue gas in a cement making plant employing a tubular kiln-heat exchanger system for the manufacture of cement, said tubular kiln having a calcination stage therein, the method comprising:
- introducing raw cement meal into said calcination stage,
- withdrawing cement meal from said calcination stage at a temperature of about 850.degree. C. to 950.degree. C. and with a deacification degree of at least 50%,
- cooling the withdrawn hot meal to a temperature of about 220.degree. to 250.degree. C., and
- thereafter contacting the meal with flue gas present in said kiln-heat exchanger system to bond the sulfur oxides in said flue gas to said partially deacidified meal.
Dependencies are inferred from the claim text.