(WO9405398-A1)      A convection tower (10) is used to clean polluted air and to simultaneously generate electricity, and consists of a tall tower (11) arranged to have a number of integral skirt sections (12) in the form of tunnels.    One or more water sprayer systems (13, 14) are disposed within the tower, arranged to give a fine water mist. These both remove pollution from the air and cause cooling of the air (by evaporation for the mist droplets). The cooling of the air causes it to flow downwards in the tower and exit via the tunnels in the skirt section. An inflow of hot, dirty air is induced at the tower top, and cool, clean air leaves at the bottom.    The flow of air in the skirt tunnels (12) is exploited by placing turbine generators (18) in them. These generate electricity as a result of the air flow through the system.    Additional water sprays (16), after the turbines, are used to remove any remaining pollutants and fine water droplets from the air leaving the system. Catch basins (15) may also be used to collect solid particles and excess water drops from the sprayers.    The conversion tower may be made from simple materials, e.g. fabric stretched across steel beams and cables. The spraying system may also incorporate chemicals to remove e.g. hydrocarbons or pollutant gases from the air.    USE/ADVANTAGE -   For removal of pollutants from air on a large scale, e.g. in cities for alleviating smog, etc. Gives efficient, economical removal of pollutants from air on a very large scale, with simultaneous generation of electricity without use of fossil fuels. For removing e.g. solid particles, CO2 etc. from city air.    (JP7508464-W)      A convection tower (10) is used to clean polluted air and ro simultaneously generate electricity, and consists of a tall tower (11) arranged to have a number of integral skirt sections (12) in the firm of tunnels.    One or more water sprayer systems (13, 14) are disposed within the tower, arranged to give a fine water mist. These both remove pollution from the air and cause cooling of the air (by evaporation for the mist droplets). The cooling of the air causes it to flow downwards in the tower and exit via the tunnels in the skirt section. An inflow of hot, dirty air is induced at the tower tope, and cool, clean air leaves at the bottom.    The flow of air in the skirt tunnels (12) is exploited by placing turbine generators (18) in them. These generate electricity as a result of the air flow through the system.    Additional water sprays (16), after the turbines, are used to remove any remaining pollutants and fine water droplets from the air leaving the system. Catch basins (15) may also be used to collect solid particles and excess water drops from the sprayers.    The conversion tower may be made from simple materials, e.g. fabric stretched across steel beams and cables. The spraying system may also incorporate chemicals to remove e.g. hydrocarbons or pollutant gases from the air.    USE/ADVANTAGE -   For removal of pollutants from air on a large scale, e.g. in cities for alleviating smog, etc. Gives efficient, economical removal of pollutants from air on a very large scale, with simultaneous generation of electricity without use of fossil fuels. For removing e.g. solid particles, CO2 etc. from city air.