Low oxygen burner applied to the boiler furnace in a repowering combined system
Conference
·
OSTI ID:20006868
Attention has lately been drawn to the combined cycle that is the combination of an existing boiler with a steam turbine and repowering gas turbine or diesel engine, as an effective power generation system capable of increasing power output as well as improving plant efficiency. For the burner applied to the boiler furnace in this system, the following technical problems must be overcome: (1) Stable ignition and firing must be realized, using the exhaust gas (O{sub 2}=11{approximately}15vol% in a wet state) from the gas turbine or diesel engine as the air for combustion. (2) Nitrogen oxides and unburned carbon contained in the exhaust gas from the gas turbine or diesel should be greatly reduced through the boiler furnace. (3) The boiler must be capable of being operated alone, independent of the combined system. In the latter case, since fresh air is used as combustion air, the total gas flow rate through the burner is decreased by approximately half. Over the last decade, research and development work has been conducted on the original burner for low O{sub 2} exhaust gas, and various types of burners for gas or oil fuel have been developed. The main topic of the present report is the research and development of circular and angular burners for gas-firing. Stable ignition and flaming could be realized for low oxygen air of 11.5{approximately}12vol% in a wet state by installing a large diameter diffuser cone as the flame stabilizer. Furthermore, the greater reduction rate for NOx assumed to be carried over from gas turbine or diesel engine, was greater than 30%. The circular type burner for gas-firing was applied to Chubu Electric Power Co., Inc. Chita units No. 1(375MW) and No. 2(375MW).
- Research Organization:
- Mitsubishi Heavy Industries, Ltd., Nagasaki (JP)
- OSTI ID:
- 20006868
- Country of Publication:
- United States
- Language:
- English
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