Internal Data Search by Event Calendar
Ken Jeffers, SCR Applications Engineer at Johnson Matthey Catalysts LLC, gave a good overview of SCR technology and described new developments to improve the life and performance of catalysts. Advances include ammonia slip control catalysts to allow higher injection rates and extend the useful life of catalysts while achieving up to 95 percent NOx reduction, catalysts being developed with enhanced Hg oxidation capability while preserving performance on deNOx and SO2 oxidation, and catalysts for high as well as lower temperature operation. He also discussed the major problems with SCR catalysts particularly flyash plugging and deactivation. Potential solutions include tail end applications. He said that there was a tradeoff between the cost to install and operate a flue gas reheat system and the potential longer life of the catalyst in a tail end position. Ken stated that there are now three units operating successfully on plants firing Texas lignite.
Revision Date: 4/7/2011
Tags: 221112 - Fossil Fuel 化石燃料, Johnson Matthey, Catalyst
Dr. Sebastian Hirschberg, Manager of R&D Energy and Environment, Mixing and Reaction Technology at Sulzer Chemtech Ltd, called in from Switzerland describing how power plant operators can improve SCR reactor performance and save money by installing and using Sulzer static mixers. The primary point of his presentation was that properly designed static mixers with CFD modeling can eliminate the need for injection lances with their problems, while increasing catalyst life, improving NOx reduction and reducing pressure drop. An arc wire coating is also available to increase the service life in highly abrasive environments. There are over 35 plants in the U.S. using these Sulzer mixers.
Revision Date: 4/7/2011
Tags: 221112 - Fossil Fuel 化石燃料, Sulzer Ltd., Static Mixer
Shiaw Tseng, Marketing Manager at Graymont, Inc., described a multi-pollutant control system for existing coal-fired power plants using lime-based Circulating Dry Scrubbers (CDS) to remove SO2, SO3, HCl, and HF. He presented the results of performance guarantee tests conducted at the AES Greenidge Station Unit #4 (107 MW) burning eastern bituminous coal (2.5 to 3 percent sulfur) with a CDS and baghouse. These tests showed pretty impressive reductions of SO2, SO3, Hg and HCl to levels that were well under the limits in the proposed utility MACT. Advantages of this system include a relatively small footprint, fuel flexibility (including biomass), low water consumption and dry byproducts (no wet sludge). Interestingly, the CDS system achieved better mercury reduction than using ACI under the same operating conditions, indicating that ACI is not required. These systems are currently operating at 14 plants in the U.S.
Revision Date: 4/7/2011
Tags: 221112 - Fossil Fuel 化石燃料, Graymont, Circulating Dry Scrubber, Lime
Robert (Bob) Crynack, Business Development Manager for the Peroxygen Division of FMC Corporation, described a process under development by FMC that utilizes hydrogen peroxide to control NOx from combustion sources and industrial processes. Injection of peroxide into existing ducts oxidizes the NOx, primarily NO, to other nitrogen species that can be captured by existing downstream equipment such as wet scrubbers, CFB scrubbers, spray dryer absorbers or dry injection (lime/trona) with ESP or FF. The technology is intended for coal-fired power plants that desire NOx reductions of 40-80 percent with minimal capital investment and low operating and maintenance cost. While it has been proven that hydrogen peroxide will oxidize NO, NO2 and even mercury, the ability of downstream equipment to capture the NOx and mercury are still being evaluated.
Revision Date: 4/7/2011
Tags: 221112 - Fossil Fuel 化石燃料, FMC Corporation, Hydrogen Peroxide
New DeNOx Approaches by Dr. Brian Adair, CoaLogix - Hot Topic Hour April 7, 2011
Brian Adair, Director of Technology at CoaLogix, coined a new term in his presentation calling SRCs “Multi-Pollutant Reduction Reactors” or MPRRs because they should now be looked at as devices to control SO3 and mercury as well as NOx. The focus of his talk was why an operator should treat a catalyst as an asset rather than a consumable. He stated that operators need to balance the different goals of deNOx, SO2 conversion, NH3 usage, pressure drop and mercury oxidation and to have a different way of long term planning. When a catalyst layer is no longer optimum for the operating conditions, it can be traded in for a different type or formulation or sold to another plant where it will achieve their objectives.
Revision Date: 4/7/2011
Tags: 221112 - Fossil Fuel 化石燃料, CoaLogix, Catalyst Maintenance
New FGD & DeNOx Approaches - Webinar April 7, 2011
Discussion on the current "state of the art" for FGD and DeNOx systems, the capabilities and limitations of current control systems and technology, the latest advancements in control technology being developed or tested and what still needs to be done to allow the utility industry to comply with the coming MACT and the other regulations.
Revision Date: 4/7/2011
Tags: 221112 - Fossil Fuel 化石燃料, CoaLogix, FMC Corporation, Johnson Matthey, Sulzer Ltd., Graymont, Lime, Static Mixer, Circulating Dry Scrubber, Hydrogen Peroxide, Catalyst Maintenance