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Apparatus for separating ash particles from a flue gas. The apparatus includes a screen that has a plurality of semi-elliptical cylinder surfaces. The semi-elliptical cylinder surfaces having holes through which said flue gas flows and through which the ash particles will not pass. The screen has a

Apparatus for separating ash particles from a flue gas. The apparatus includes a screen that has a plurality of semi-elliptical cylinder surfaces. The semi-elliptical cylinder surfaces having holes through which said flue gas flows and through which the ash particles will not pass. The screen has a single layer for performing the separation in a manner such that the ash particles fall away from the screen and collect outside of the screen. A method of reducing velocity of a flue gas passing through screening apparatus for separating flue gas from ash particles. The method includes replacing a first screen of the screening apparatus with a second screen that has a plurality of semi-elliptical cylinder surfaces.

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1. A method of separating ash particles from a flue gas, said method comprising: flowing a flue gas and ash particle mixture from a boiler via a duct to a screen having a plurality of semi-elliptical cylinder surfaces, said semi-elliptical cylinder surfaces having holes through which said flue gas f

1. A method of separating ash particles from a flue gas, said method comprising: flowing a flue gas and ash particle mixture from a boiler via a duct to a screen having a plurality of semi-elliptical cylinder surfaces, said semi-elliptical cylinder surfaces having holes through which said flue gas flows and through which said ash particles will not pass, said screen having a single layer for performing said separating in a manner such that said ash particles fall away from said screen and collect outside of said screen, said screen being disposed in said duct's lumen such that flue gas flows through said screen to a destination equipment via said duct. 2. The method of claim 1 wherein said flue gas is flowed from a side of said screen on which foci points of said semi-elliptical cylinder surfaces lie. 3. The method of claim 1 wherein said flue gas is flowed from an opposite side of said screen on which foci points of said semi-elliptical cylinder surfaces lie. 4. The method of claim 1 wherein said flue gas is flowed from a side of said screen that has foci points of some of said plurality of semi-elliptical cylinder surfaces to a side of said screen that has foci points of other of said plurality of semi-elliptical cylinder surfaces. 5. The method of claim 1 further comprising: flowing said flue gas and ash particle mixture through a side section of each semi-elliptical cylinder surface, said side section having holes through which said flue gas flows and through which said ash particles will not pass. 6. The method of claim 1 wherein said holes of said screen comprises a cross sectional area of about 1 mm2-200 mm2. 7. The method of claim 1 further comprising: collecting said separated ash particles in a hopper. 8. The method of claim 1 further comprising: after said separation, discharging said flue gas into the atmosphere. 9. The method of claim 1 further comprising: after said separation, cleaning said flue gas further; anddischarging said cleaned flue gas to the atmosphere.