F - Mech Eng,Light,Heat,Weapons – 22 – B
Patent
F - Mech Eng,Light,Heat,Weapons
22
B
257/29
F22B 1/00 (2006.01) C23F 15/00 (2006.01) F22B 37/02 (2006.01) F24H 9/00 (2006.01)
Patent
CA 1135252
- 1 - A method of preventing corrosion in boiler-plant equipment ABSTRACT A method of preventing corrosion in boiler-plant equip- ment when cooling flue gases originating from a combustion plant, such as flue gases containing sulphur oxide or organic acids, to a temperature beneath the acid dew-point of the gases, in a cooler having heat-exchanging walls. The flue gases are passed to the cooler at a temperature above the acid dew-point. Those surfaces of the heat-exchanging walls, over which the gases flow, are held at a temperature beneath an upper permitted wall-temperature in respect of the material from which the walls are made, and in respect of the prevailing partial pressure of water vapour present in the gases, by means of a coolant, suitably water, located on the other side of the heat-exchanger walls. The partial pressure of the water vapour in the gases can be increased by applying one of the following steps: supplying water or hydrogen-containing compounds to the combustion process, adding water or hydrogen- containing compounds to the gases, or cooling the gases at elevated pressures.
370362
Bernstein Ragnar L. H.
Tiberg Lars A.
Fagersta Ab
Swabey Ogilvy Renault
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