John D Mckenna

US Patent:

56246447, Apr 29, 1997

Filed:

Nov 2, 1994

Appl. No.:

8/333343

Inventors:

John D. McKenna - Rocky Mount VA
Kenneth W. Appell - Roanoke VA
John C. Mycock - Roanoke VA
Joseph F. Szalay - Braxburg VA

Assignee:

ETS International, Inc. - Roanoke VA

International Classification:

B01D 5334

US Classification:

422177

Abstract:

An improved apparatus and process is provided for scrubbing sulphur oxide gas from combustion flue gas with wet limestone particles as a reactive scrubbing agent. The process is carried out in a moving bed reactor having louvered inlet and outlet sides which permit the flue gas to pass through the reactor while the limestone particles move downward. The flue gas may be flowed through the moving bed reactor at a high velocity to permit scrubbing of large volumes of gas in a thorough and efficient manner. The high velocity of flue gas passing through the reactor causes some of the scrubbing particles to be ejected from the outlet side of the reactor. Problems associated with the ejection of the scrubbing particles are avoided by providing a slot alongside the outlet side or the reactor. The slot is sized so that the flue gas passing therethrough will have insufficient velocity to entrain the ejected scrubbing particles therein. Consequently, the particles will fall to the bottom of the slot where they can be recovered and recycled.

US Patent:

56478925, Jul 15, 1997

Filed:

Sep 6, 1996

Appl. No.:

8/709158

Inventors:

John D. McKenna - Rocky Mount VA
Kenneth W. Appell - Roanoke VA
John C. Mycock - Roanoke VA
Joseph F. Szalay - Braxburg VA

Assignee:

ETS International, Inc. - Roanoke VA

International Classification:

B01D 5302
B01D 5306
B01D 5312

US Classification:

95110

Abstract:

An improved apparatus and process is provided for scrubbing sulphur oxide gas from combustion flue gas with wet limestone particles as a reactive scrubbing agent. The process is carried out in a moving bed reactor having louvered inlet and outlet sides which permit the flue gas to pass through the reactor while the limestone particles move downward. The flue gas may be flowed through the moving bed reactor at a high velocity to permit scrubbing of large volumes of gas in a thorough and efficient manner. The high velocity of flue gas passing through the reactor causes some of the scrubbing particles to be ejected from the outlet side of the reactor. Problems associated with the ejection of the scrubbing particles are avoided by providing a slot alongside the outlet side of the reactor. The slot is sized so that the flue gas passing therethrough will have insufficient velocity to entrain the ejected scrubbing particles therein. Consequently, the particles will fall to the bottom of the slot where they can be recovered and recycled.