OCR Text |
Show Queens University in Kingston and the research furnace at Combustion and Carbonization Research Laboratory (CCRL, CANMET) in Ottawa. The CAGCT validation tests began in 1993 and are expected to finish by mid-1994. The CCRL tests are planned to begin in mid-1994. CGRI COMBUSTION RESEARCH FACILITY A testing facility was designed and built at CGRl to evaluate the perfonnance of experimental burners (maximum Erring rate 1,500,000 Btu/h) with preheated combustion air (up to 1200 OF). The combustion research facility comprises an instrumented tunnel furnace (4'6" x 4'6" x 16'), an independent combustion air preheater unit (a smaller gas fired furnace and a tubular indirect heat exchanger), exhaust system, automatic ignition, combustion safety control and flame detection components and auxiliary hardware components. THE CGRI LOW NOx BURNER The developed low NOx burner technology is a direct fuel injection burner (DFIB) technology based on separate injection of air and fuel into the furnace via multiple orifices at prescribed orientations. An auxiliary low capacity premix burner is incorporated to maintain safe start-up and stable combustion. Our burner concept may be regarded as corresponding to simultaneous air and fuel staging together with proprietary methods of air-fuel-combustion products mixing in the furnace to induce internal recirculation of combustion products in the near burner zone. The CGRl developed low NOx DFIB technology is plausible in the high degree of air preheat that it can take and the simple configuration of the burner head with no moving parts which make it cost effective to manufacture. No commercial burner technology is available on the market with comparable NOx levels to the CGRl burner at the high air preheat temperatures without external flue gas recirculation. CORl Low NOx burner AFRC Spring 1994 Meeting page 3 |