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Hitachi continues to develop new catalysts that enhance the performance of the SCR with low cost solutions, minimize the operational impact to the unit, and provide the flexibility required. Offering the SCR system with the scrubber allows the company to make system guarantees on mercury control.
Revision Date: 10/22/2010
Tags: 221112 - Fossil Fuel 化石燃料, Hitachi Power Systems America, Catalyst, Regeneration
Catalyst Selection for Coal-fired Power Plants Webinar - Hot Topic October 21, 2010
Experts representing consulting, catalyst, regeneration, and systems companies provided an indepth analysis of the latest trends in catalyst use in coal-fired power plants. The dominant theme was that the SCR is no longer just a NOx removal device but is a multi-pollutant control device. Various alternatives for increasing performance and decreasing cost were proposed. Some involved maintenance of the existing catalyst while others emphasized better designs which last longer without maintenance and can thereby minimize or eliminate the maintenance. There was also discussion on how the various designs compare. The claim was made that hydraulic diameter was a better measure than pitch. There was agreement that it would be desirable to define various terms relative to maintenance of catalysts. The consensus seemed to be as follows: CATALYST Management 1. Maintenance a. Cleaning b. Rejuvenation c. Regeneration 2. Replacement Cleaning Catalyst: a dry process such as vacuum or mechanical removal of accumulations Rejuvenation Catalyst: wet chemical removal of accumulations Regeneration Catalyst: wet chemical removal plus re-impregnation of catalytic compounds Physical characteristics 1. Geometry a. Catalyst shape 1. Honeycomb 2. Corrugated 3. Plate b. Openings 1. Pitch 2. Hydraulic diameter Hydraulic diameter: The hydraulic diameter, DH, is a commonly used term when handling flow in noncircular tubes and channels. Using this term one can calculate many things in the same way as for a round tube. Definition: DH =4A P where A is the cross sectional area and P is the wetted perimeter of the cross-section. Reference http://en.wikipedia.org/wiki/Hydraulic_diameter McIlvaine solicits the input from subscribers as to the appropriate nature of this classification.
Revision Date: 10/22/2010
Tags: 221112 - Fossil Fuel 化石燃料, W. S. Hinton & Associates, Cormetech, Hitachi Power Systems America, CoaLogix, Catalyst, Cleaning, Regeneration