Advanced Hybrid Particulate Collector

Abstract

A new concept in particulate control, called an advanced hybrid particulate collector (AHPC), is being developed under funding from the U.S. Department of Energy. The AHPC combines the best features of electrostatic precipitators (ESPs) and baghouses in an entirely novel manner. The AHPC concept combines fabric filtration and electrostatic precipitation in the same housing, providing major synergism between the two methods, both in the particulate collection step and in transfer of dust to the hopper. The AHPC provides ultrahigh collection efficiency, overcoming the problem of excessive fine-particle emissions with conventional ESPs, and solves the problem of reentrainment and re-collection of dust in conventional baghouses.Phase I of the development effort consisted of design, construction, and testing of a 5.7-m 3 /min (200-acfm) working AHPC model. Results from both 8-hr parametric tests and 100-hr proof-of-concept tests with two different coals demonstrated excellent operability and greater than 99.99% fine-particle collection efficiency.Since all of the developmental goals of Phase I were met, the approach was scaled up in Phase II to a size of 255 m 3 /min (9000 acfm) (equivalent in size to 2.5 MW) and was installed on a slipstream at the Big Stone Power Plant. For Phase II, the AHPC at Big Stone Power Plant was operated continuously from late July 1999 until mid-December 1999. The Phase II results were highly successful in that ultrahigh particle collection efficiency was achieved, pressure drop was well controlled, and system operability was excellent.For Phase III, the AHPC was modified into a more compact configuration, and components were installed that were closer to what would be used in a full-scale commercial design. The modified AHPC was operated from April to July 2000. While operational results were acceptable during this time, inspection of bags in the summer of 2000 revealed some membrane damage to the fabric that appeared to be caused by electrical effects. Subsequently, extensive theoretical, bench-scale, and pilot-scale investigations were completed to find an approach to prevent bag damage without compromising AHPC performance. Results showed that the best bag protection and AHPC performance were achieved by using a perforated plate installed between the discharge electrodes and bags. This perforated-plate design was then installed in the 2.5-MW AHPC at Big Stone Power Plant in Big Stone City, South Dakota, and the AHPC was operated from March to June 2001. Results showed that the perforated-plate design solved the bag damage problem and offered even better AHPC performance than the previous design. All of the AHPC performance goals were met, including ultrahigh collection efficiency, high air-to-cloth ratio, reasonable pressure drop, and long bag-cleaning interval.ii Company. The AHPC combines the best features of electrostatic precipitators (ESPs) and baghouses in a unique approach to develop a compact but highly efficient system. Filtration and electrostatics are employed i...

Impact of Supplemental Firing of Tire-Derived Fuel (TDF) on Mercury Species and Mercury Capture with the Advanced Hybrid Filter in a Western Subbituminous Coal Flue Gas

“…Combining the best features of ESPs and fabric filters in a unique approach, the Advanced Hybrid filter provides >99.99% collection efficiency for fine particles at high filtration velocities with reasonable pressure drops. Detailed information on PM capture with the Advanced Hybrid filter has been reported elsewhere. ,

2 Front view of the 55 kW (200 acfm) Advanced Hybrid filter at the EERC.

…”

Numerical Simulation of the Particle Deposition Characteristics Inside a Scale Hybrid Particulate Collector

“…The advanced hybrid particulate collector (AHPC) is a new type precipitator [12] (Figure 1). The bags and the ESP are placed in the same housing, working synergically both in the particulate collection and in the dust cleaning.…”