Abstract:
A practical method of recovering CO 2 from a mixture of gases, and sequestering the captured CO 2 from the atmosphere for geologic time as calcium carbonate and provides a CO 2 scrubber for carbon capture and sequestration. The CO 2 scrubber incorporates an aqueous froth to maximize liquid-to-gas surface area and time of contact between gaseous CO 2 and the calcium hydroxide solution. The CO 2 scrubber decreases the temperature of the liquid and the mixed gases, increases ambient pressure on the bubbles and vap pressure inside the bubbles, diffuses the gas through intercellular walls from smaller bubbles with high vapor pressure into larger bubbles with low vapor pressure, and decreases the mean-free-paths of the CO 2 molecules inside the bubbles, in order to increase solubilit of CO 2 and the rate of dissolution of aseous CO 2 from a mixture of ases into the calcium h droxide solution.
Abstract:
A method for urging contact between contaminants in an air stream and the wet surfaces of an aqueous froth are provided. A solution of micro-droplet (806) is introduced into a contamined air stream. Micro-droplets (806) suspended in the air stream remove contaminants and are removed by inertia. The saturated contaminated air stream expands the surface area of the solution reservoir (808) exponentially into an aqueous froth (815) of tiny bubbles. Contaminants and solution micro-droplets suspended in the air, settle out by acceleration of gravity into the wet surfaces of each bubble. The froth is dewatered by condensation onto cold refrigerant coils (820). The liquid solution and contaminants drain from the refrigerant coils (820) into the solution reservoir (808). Solution micro-droplets remaining in the air steam are separated by a centrifugal blower/droplets (140) separator and drain back into the solution reservoir (808). The air steam is passed through condensing refrigerant coils (160) to reheat the air steam.
Abstract:
A method and apparatus are provided for improving the efficiency of an aqueous froth filter. An array of saturated mesh assemblies interacts with an incoming contaminated air stream. As the air stream flows through the saturated mesh assemblies, an aqueous froth is generated immediately downstream of each mesh assembly. As the bubbles of the froth move downstream towards the next saturated mesh assembly, the velocity of the air stream causes at least some of the bubbles to burst. The bursting bubbles rupture into hundreds or thousands of micro-droplets. The micro-droplets are used together with the aqueous froth to coalesce with or otherwise bind with contaminants in the air stream. An optional feature is that massive particles greater than three microns in diameter are removed by inertial impaction, whereby those heavy particles collide with the walls of serpentine shaped vanes of a mist eliminator. The method and apparatus are capable of filtering chemical and biological warfare agents out of an air stream. The invention is also useful in removing contaminants from industrial air streams.