Enhancing the use of coals by gas reburning-sorbent injection. Quarterly report No. 26, January 1--March 31, 1994
The objective of this project is to evaluate and demonstrate a cost effective emission control technology for acid rain precursors, oxides of nitrogen (NO{sub x}) and sulfur (SO{sub x}), on two coal fired utility boilers in Illinois. The units selected are representative of pre-NSPS design practices: tangential and cyclone fired. Work on a third unit, wall fired, has been stopped because of funding limitations. The specific objectives are to demonstrate reductions of 60 percent in NO{sub x} and 50 percent in SO{sub x}, emissions, by a combination of two developed technologies, gas reburning (GR) and sorbent injection (SI). With GR, about 80-85 percent of the coal fuel is fired in the primary combustion zone. The balance of the fuel is added downstream as natural gas to create a slightly fuel rich environment in which NO{sub x} is converted to N{sub 2}. The combustion process is completed by overfire air addition. SO{sub x} emissions are reduced by injecting dry sorbents (usually calcium based) into the upper furnace. The sorbents trap SO{sub x} as solid sulfates that are collected in the particulate control device. This project is conducted in three phases at each site: (1) Design and Permitting, (2) Construction and Startup, and (3) Operation, Data Collection, Reporting and Disposition. Phase III is now in progress at both sites. In phase AIII at Hennepin - Testing, Data Collection, Reporting and Disposition - Gas Reburning runs were made that indicate as high as 77% reduction in NO{sub x} emission using about 18% gas. Gas Reburning - Sorbent Injection test results indicated as high as 62% reduction in S0{sub 2}. These results are significantly higher than the project emission reduction goals of 60% NO{sub x} and 50% S0{sub 2} and provided a wide safety margin for maintaining the 60% and 50% emission reductions during long term routine testing. A year of long term testing was completed in October, 1992.
- Research Organization:
- Energy and Environmental Research Corp., Irvine, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FC22-87PC79796
- OSTI ID:
- 10147772
- Report Number(s):
- DOE/PC/79796-T36; ON: DE94011153; TRN: 94:005087
- Resource Relation:
- Other Information: PBD: 15 Apr 1994
- Country of Publication:
- United States
- Language:
- English
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