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The support bracket and lining were prepared using grinders to ensure a proper taper on all edges for attachment to the rubber lining. The area was completely covered with the proper mastic to adhere the rubber in place. The lining was precut outside the absorber and applied to the work area inside. All of the mounting brackets were installed before the rubber liner performed any vulcanizing work. The actual ALRD plate was used as a pattern to ensure a proper fit. The plates were bolted in place before the top edge was vulcanized to the shell.
Results of upgrade
With both levels in place, the system was able to successfully meet the state-required emissions limit. The system is now operated to maintain the required 0.15 lb SO2 /MMBtu, instead of the historical operation to a system percentage removal efficiency. The system is capable of achieving more than 97 percent removal efficiency at the design 5.11 lb/MMBtu fuel, however, the system sulfur level is routinely less than the design level.
The improvement in the SO2
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The daily SO2 emissions data from the EPA’s Clean Air Markets Division collected for the period after the ALRD installation shows that the Unit 2 emissions were typically less than the state-mandated level of 0.15 lb/MMBtu in Figure 4. During the recorded period, the SO2 emissions averaged 0.11 lb/MMBtu and met the 30 day rolling average SO2 emissions ACO requirement of 0.150 lbs/MMBtu. The SO2 emissions trend contains periods when Unit 2 was off-line due to low power demand.
Conclusions
The installation of the ALRD technology at B.L. England successfully achieved the upgrade SO2 emissions target across a broad range of operating conditions. Beyond the reduced SO2 emissions, other project technical requirements were to not adversely affect the particulate emissions or mist eliminator carryover from the absorber – which also were met. The operating performance of the wet scrubber improvements at the B.L. England Station were successful and resulted in RCCMH waiving the performance tests. The plant was particularly pleased that the 2,200+ hours of installation work, including welding in a rubber lined vessel, were completed without incident. The ALRD installation has not impacted plant operation, maintenance or availability, nor has it had any measurable impact on the system pressure drop. The ALRD technology demonstrated that it is a viable candidate for further FGD upgrades.
Gary Andes, PE, is director of Air Quality Control (AQC) at the WorleyParsons’ Power Group office in Reading, Pa., and is responsible for coordinating all AQC design evaluation and improvement services. Andes has a bachelor’s degree from Pennsylvania State University and has been a Registered Professional Engineer for more than 28 years. Within the Air Quality industry, Andes holds two patents in wet and dry scrubbing and has published or presented 18 technical papers. You may contact him by e-mailing editorial@woodwardbizmedia.com.
Dennis Del Vecchio is a special projects manager at the BL England Generating Plant, with more than 35 years of project and team management experience. He has a bachelor’s degree in Electrical Engineering from New Jersey Institute of Technology and a master’s degree in Business Administration from Monmouth University with a major in Finance and Marketing. You may contact him by e-mailing editorial@woodwardbizmedia.com.
Michael Hammer is a senior process engineer for Marsulex Environmental Technologies Corp. He has more than 32 years of experience in the power industry, with 20 years of it in the field of air quality control covering flue gas desulfurization (FGD). He has a degree in electrical engineering and has 4 patents for FGD technologies. You may contact him by e-mailing editorial@woodwardbizmedia.com.
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