DAVID A LEWANDOWSKI
Engineers in North Belle Vernon, PA
License number
Pennsylvania PE044340E
Category
Engineers
Type
Professional Engineer
Address
Address
North Belle Vernon, PA 15012
Professional information
Method To Minimize Chemically Bound Nox In A Combustion Process
US Patent:
5707596, Jan 13, 1998
Filed:
Nov 8, 1995
Appl. No.:
8/555041
Inventors:
David A. Lewandowski - Belle Vernon PA
Peter B. Nutcher - Canonsburg PA
Peter J. Waldern - Bethel Park PA
Peter B. Nutcher - Canonsburg PA
Peter J. Waldern - Bethel Park PA
Assignee:
Process Combustion Corporation - Pittsburgh PA
International Classification:
B01D 5356
US Classification:
423235
Abstract:
The present invention is directed to a method which significantly improves the efficiency of reducing nitrogen oxide formation and emission during incineration of a waste gas in an air-staged thermal oxidizer. In accordance with the present invention, a natural gas stream is mixed with combustion air in a burner and the mixture is ignited with the immediate introduction of liquid water. Thus, the resulting mixture is then injected into a first reducing zone which is fuel rich in order to begin the combustion process, but retard the formation of nitrogen oxides. The waste gas exiting the reducing zone is deficient in oxygen due to the fuel rich atmosphere in the first reducing zone and cooler due to the water cooling as it enters the second oxidizing zone. In the second oxidizing zone, additional oxygen in the form of air is injected to complete the combustion process. Due to the fact that the waste gas is cooler in the oxidizing zone, the peak temperature resulting from completion of combustion reactions is lower and thermal nitrogen oxide formation is minimized in the second oxidizing zone.
Purge System For Regenerative Thermal Oxidizer
US Patent:
5931663, Aug 3, 1999
Filed:
Feb 27, 1998
Appl. No.:
9/031273
Inventors:
David A. Lewandowski - Belle Vernon PA
Peter B. Nutcher - Canonsburg PA
Peter J. Waldern - Bridgeville PA
Peter B. Nutcher - Canonsburg PA
Peter J. Waldern - Bridgeville PA
Assignee:
Process Combustion Corporation - Pittsburgh PA
International Classification:
F27D 1700
US Classification:
432181
Abstract:
A continuous system and method for purging waste gases from dual heat exchange beds associated with a regenerative thermal oxidizer are disclosed. The system includes a purge recovery tank, a stack open to the atmosphere, a stack bypass, a stack valve in the stack, and a stack bypass valve in the stack bypass. The purge recovery tank is in fluid communication with two heat exchange beds, the stack, and the stack bypass. The stack is in fluid communication with the stack bypass and the heat exchange beds. A purge recycle control valve is used to recycle untreated waste gases from the purge recovery tank to the heat exchange beds and into the regenerative thermal oxidizer. A second embodiment wherein the purge recovery tank is positioned between the two heat exchange beds is also disclosed.