US 4,789,532 AGranted

Method for cleaning of a hot flue gas stream from waste incineration

AssigneeA/S Niro Atomizer

InventorsEbbe S. Jons, Jens T. Moller, Kirsten K. Nielsen

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Abstract

In a method for cleaning of flue gas derived from waste incineration, of the kind which comprises spray drying a lime slurry in the hot flue gas, the amount of active lime used is from 1.5 to 2.5 times larger than the amount reacting with the acidic components of the flue gas; furthermore, ground blast-furnace slag is incorporated in the lime slurry in an amount that is equivalent to 30 to 100% by weight of the amount of calcium salts generated at the flue gas cleaning. An end-product is hereby obtained, which upon admixing with water, forms a concrete-like material with high mechanical strength and great ability to retain the pollutants present therein so that the product is suited for disposal in nature with a minimum risk of polluting water streams and ground water.

Claims7

Dependent claims

A method of cleaning a stream of hot flue gas derived from waste incineration to provide an end-product which may be disposed of with a minimum risk of environmental pollution, comprising:

(a) spray drying an aqueous slaked lime slurry containing ground blast-furnace slag in said hot flue gas containing acidic components to produce a particulate end-product which contains the reaction products between said lime and the acidic components removed from the flue gas together with non-reacted lime and any fly ash present in said hot flue gas, wherein said slurry contains an amount of potentially active lime which is from about 1.5 to about 2.5 times larger than the amount of lime necessary to react with said acidic components of said hot flue gas and wherein said ground blast-furnace slag is present in said slurry in an amount equivalent to from about 30 to about 100% by weight of the amount of calcium salts generated by the reaction between said acidic components of said hot flue gas and said lime;
and
(b) removing said particulate end-product from said gas.

Dependencies are inferred from the claim text.

Facts

Application: 07/002,250Filed 12 Jan 1987
Priority: DK 235/8617 Jan 1986
Granted: 6 Dec 1988
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

B01D 53/501
Sulfur oxides: by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
B01D 53/68
Removing components of defined structure: halogens or halogen compounds
C04B 18/105
Burned or pyrolised refuse: gaseous combustion products or dusts collected from waste incineration, e.g. sludge resulting from the purification of…
Y02W 30/91
Reuse, recycling or recovery technologies: use of waste materials as fillers for mortars or concrete