Enhancing the use of coals by gas reburning-sorbent injection. Volume 2, Gas reburning-sorbent injection at Hennepin Unit 1, Illinois Power Company
A Clean Coal Technology (CCT) Project has been completed at a 71 MW(e) (net) tangentially fired unit in Hennepin, Illinois. Energy and Environmental Research Corporation (EER) has demonstrated Gas Reburning-Sorbent Injection (GR-SI) to reduce emissions of NO{sub x} and SO{sub 2}, by 60 and 50%, respectively. The host unit was Illinois Power`s Hennepin Station Unit 1 which normally fires an Illinois bituminous coal containing approximately 3% sulfur. EER designed and retrofitted the GR-SI system, then evaluated its performance over a year-long demonstration. With GR-SI, natural gas is injected into the furnace above the coal burners to reduce NO{sub x} to N{sub 2} and dry hydrated lime sorbent is injected into the upper furnace for S0{sub 2} capture. Natural gas is injected, at a rate corresponding to 18% of the total heat input, to form a fuel rich reducing zone in which NO{sub x} formed in the coal zone is reduced to N{sub 2}. Overfire (burnout) air is injected at a higher point in the boiler to burnout fuel combustibles under overall fuel lean conditions. Hydrated Lime, Ca(OH){sub 2}, is injected into the upper furnace cavity through front and side wall injectors, at a rate corresponding to a calcium (sorbent) to sulfur (coal) molar ratio of 1.75. Over the year-long GR-SI demonstration the average NO{sub x} reduction was 67%, from the 0.75 lb/MBtu (323 mg/MJ) coal baseline, and the average S0{sub 2} reduction was 53%, from the 5.3 lb/MBtu (2280 mg/MJ) coal baseline. The average calcium utilization with Linwood hydrated lime sorbent was 24%. Low emissions of CO were maintained, with an average of 57 ppM ({at} 3% 0{sub 2}). Reduction of CO{sub 2} emissions of 7%, from 15.6 to 14.5% ({at} 3% O{sub 2}), was also measured.
- Research Organization:
- Energy and Environmental Research Corp., Bartonville, IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); Gas Research Inst., Chicago, IL (United States); Illinois Dept. of Energy and Natural Resources, Springfield, IL (United States)
- DOE Contract Number:
- FC22-87PC79796
- OSTI ID:
- 78561
- Report Number(s):
- DOE/PC/79796-T38-Vol.2; ON: DE95009448
- Resource Relation:
- Other Information: PBD: Oct 1994
- Country of Publication:
- United States
- Language:
- English
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