Demonstration of COHPAC II for control of fine particulate emissions and air toxics from coal-fired power plants
- Southern Co. Services, Birmingham, AL (United States)
- Southern Research Inst., Birmingham, AL (United States)
- Electric Power Research Inst., Palo Alto, CA (United States)
The Clean Air Act Amendments of 1990 require utilities to reduce sulfur dioxide (SO{sub x}) emissions and study the potential effect of trace emissions, such as mercury, from power plants. Certain approaches for SO{sub x} control that could be cost-effective for specific sites, such as fuel switching and sorbent injection, can severely affect the particulate collection performance of existing electrostatic precipitators (ESPs). For many existing ESPs, especially those with small collection areas, costly solutions might be required, such as construction of new fabric filter (baghouse) systems, a significant increase in the size of an existing ESP, or the use of high efficiency scrubbers. The COmpact Hybrid PArticulate Collector (COHPAC) is an EPRI-patented concept which can potentially provide up to 60% savings in capital cost requirements compared to more traditional systems. The approach is to retrofit either a stand-alone pulse-jet baghouse downstream of the existing particulate control device, usually an under-performing ESP (COHPAC I), or retrofit a pulse-jet baghouse (PJB) into the last field of an existing ESP (COHPAC II). The combination of low ash loading and charged ash entering the baghouse will allow the PJB to operate with fewer bags, a higher than normal filtering air-to-cloth ratio and moderate pressure drop. In this Southern Company/Electric Power Research institute sponsored demonstration an existing three-field, pilot-scale ESP has been refurbished and fitted with a pulse-jet baghouse compartment in place of the last of its three precipitator fields (COHPAC II). Tests are being performed to evaluate ESP and baghouse performance and measure trace metal emission control capabilities downstream of the unit. Performance to date is discussed.
- OSTI ID:
- 257011
- Report Number(s):
- CONF-950952-; TRN: IM9631%%217
- Resource Relation:
- Conference: 12. annual international Pittsburgh coal conference, Pittsburgh, PA (United States), 11-15 Sep 1995; Other Information: PBD: 1995; Related Information: Is Part Of Twelfth annual international Pittsburgh coal conference: Proceedings. Coal -- Energy and the environment; Chiang, S.H. [ed.]; PB: 1248 p.
- Country of Publication:
- United States
- Language:
- English
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