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1. WO1984000903 - PROCEDE D"ELIMINATION DE SUBSTANCES POLLUANTES DE L"AIR QUI SONT LE RESULTAT DE LA COMBUSTION DE CARBURANTS CONTENANT DU SOUFRE

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[ EN ]

CLAIMS
1. A process to eliminate air pollutants resulting from the combustion of sulphur bearing fuels, characterized in that it comprises the following steps:
provide at least one injection of Ammonia into 250ºC to

600ºC combustion gases, in sufficient quantity to transform substantialy all the existing SO3 and SO2 (produced by the combustion of these fuels) into Ammonium Sulphate;
. cool the combustion gases to a temperature lower than 65ºC; . pass these gases through a separation system adequate for submicron to low value micra particulates;
. collect the Ammonium Sulphate end-product from the
separation system;
. release the desulphurized gases to the atmosphere.
2. A process as claimed in claim 1, characterized in that the Ammonia injection is made with the combustion gases being at a temperature range of about 250ºC to 0ºC.
3. A process as claimed in ciai~ 1, characterized in that the injection phase comprises:
. a first injection of Ammonia into the combustion gases when these are at a 250ºC to 6 C temperature range and in sufficient quantity to react with all the formed during by the combustion of these fuels;
a second injection of Ammonia into the combustion gases when these are at a 65 C to 25 °C temperature range, and in a. sufficient quantity to react with substantially all SO2 if desired, with part of the SO2, so as to be within the local limits for emission of SO2, as established by the Environmental Authorities.
4. A process as claimed in claim 3, characterized in that the first injection of Ammonia is made with the combustion gases when they are at a temperature range of 300°C to 400°C and second injection of Ammonia with the gases at 65°C to 120°C range.
5. A process as claimed in any one of the claims 1 or 2, characterized in that the separation means include absorbers with water, with the resulting Ammonium Sulphate Solution being separated from the desulphurized combustion gases.

6. A process as claimed in claim 5, characterized in that the cooling of the combustion gases to temperatures under

65°C can also be completed in the separation system.
7. A process as claimed in any one of the claims 1 to 4, characterized by the fact that the Ammonia is preferably injected in gaseous state.
8. A process as claimed in claim 7, characterized in that the injection of Ammonia, when as gas, is made by means of perfurated tubes installed transvarsally to the combustion gases' stream.