Hot Topic Hour on Nov. 5, 2009 at 10 a.m. CST Will Focus on
Gas Turbine Air Pollution Control
Over the past few years, we have conducted many webinars on APC systems and equipment but the focus has always been on the application to coal-fired power plants. Now, with renewed interest in utilization of gas turbines and the continued pressure on utilities from environmental groups to abandon plans for new coal-fired plants, we thought it was time to discuss issues related to gas turbines. Although gas turbines have been in operation for many years and are proven to produce low emission rates (as low as 0.8 ppm NOx with undetectable levels of carbon monoxide) there are many problems and issues unique to control of air pollution from GTs that are far different than those faced by coal plants.
For example, most gas turbines are operated as peaking units and have rapid ramp rates which result in severe temperature and flow velocity changes. The SCR catalyst must be carefully selected based on the operating temperature then the balance between the cost of catalysts for different operating temperatures and the cost of cooling or dilution systems must be evaluated. If a CO catalyst is included in the design, it may have an influence on SCR catalyst performance. If the GT is also operated on oil when gas prices are high, then the sulfur content of the oil must be considered (in regard to SO2 to SO3 conversion and the resulting ammonium bisulfate after the SCR), as well as vanadium content. Gas turbine exhaust is very turbulent and flow modification devices may be required to insure good mixing of ammonia with the exhaust gas and uniform flow across the catalyst. Backpressure however leads to a reduction in power and temperature changes in the turbine.
The following speakers will address the current issues related to GT APC, provide details on the latest technology being developed or tested, describe the performance of systems that have been proven in the field and discuss the issues related to the design, operation and maintenance of GT APC.
Robert (Bob) McGinty, Sales Manager, Capital Projects and OEM SCR's, Johnson Matthey, Inc., Stationary Emission Control Business Unit will discuss the design, technical considerations, control and operational aspects of SCR systems with examples of actual installations. His presentation will cover the following subsets of the SCR system:
a. NH3 tank and forwarding pumps, Aqueous and Anhydrous reagents
b. NH3 vaporization skid, electric and hot flue gas
c. NH3 injection grid - arraignment and design
d.SCR Catalyst - Reactor design and considerations and catalyst technology
e. CO Catalyst - Catalyst technology
f. Flow Modeling - Cold flow modeling
g. Quench air fans- Injection and control
h. Reactor design - Engineering considerations and sealing
i. Constructability - Lowest installed vs. lowest supplied cost
McLeod Stephens, Business Development Manager, TDC Filter will discuss life assessment of inlet air filters for Gas Turbines to allow planning of outages.
Brian Swanson, CMC Solutions LLC will describe a robust statistical hybrid model PEMS that has been proven to be a cost-effective continuous compliance monitoring solution for nitrogen oxides and carbon dioxide emission trading programs for gas turbines. These solutions are extremely cost-effective when compared to conventional continuous emission monitoring equipment.
Thomas "Nathan" White, Director, Business Development, SCR/DeNOx Catalyst & Technology, Haldor Topsoe
To register for the “Hot Topic Hour” on Thursday, Nov. 5, 2009 at 10:00 a.m. CST (Chicago time), click on: http://www.mcilvainecompany.com/brochures/FGDnetoppbroch/Default1.htm.
Bob McIlvaine
President
847 784 0012 ext 112
rmcilvaine@mcilvainecompany.com