Method and apparatus for cleaning flue gases
AssigneeA. Ahlstrom Corporation
InventorsReijo Kuivalainen, Yam Y. Lee, Karukkampalayam M. Sellakumar, Charles M. Davis
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Abstract
Hot flue or process gases are cleaned utilizing an apparatus containing a barrier filter module formed of a monolithic ceramic support structure coated with a thin porous ceramic layer having a pore size of about 0.04-0.5 microns, and a catalyst module formed of a support structure coated with catalyst. The hot flue gases may be associated with a fluidized bed boiler plant, such as a circulating fluidized bed reactor. Gases to be cleaned are passed through the barrier filter module into contact with the thin porous ceramic layer, and then through the catalyst module so that there is a catalytic reaction with the gas.
Claims29
Apparatus for cleaning flue gases from a combustor moving in a gas flow, the apparatus comprising:
- means for supplying the flue gas from a combustor;
- a barrier filter module, formed of a monolithic ceramic filter support structure coated with a thin porous ceramic layer, the pores of the ceramic layer being 0.04 to 0.5 .mu.m;
- a catalyst module, formed of a support structure coated with catalyst;
- and
- means for transporting flue gases from the means for supplying the flue gas to the barrier filter module and then to the catalyst module.
A fluidized bed boiler plant, including a fluidized combustor having an outlet for discharging flue gas, a particle separator for separating particles from the flue gas, a convection section for recovering heat from the flue gas and a gas cleaning system for cleaning the flue gas, and a gas flow path connecting the combustor to a discharge, the gas cleaning system comprising, in a common housing:
- a monolithic ceramic filter support structure coated with a ceramic porous membrane, having pores <0.5 .mu.m;
- and
- a monolithic catalyst support structure coated with a first catalyst connected to the filter support structure, between the monolithic ceramic filter and the discharge.
Dependencies are inferred from the claim text.