best practices

Combined Cycle Journal: “Consider the impact of new operating regimes on your SCR”

Incorporating real world operating data analysis into your SCR management plan is a topic that is gaining some well-deserved traction within the power industry. Combined Cycle Journal posted an article on November 8th, 2017 highlighting Environex Senior Engineer Andrew Toback’s presentation at the 2017 Combined Cycle Users Group Conference, “Impact of Real-World Operation on Catalyst Performance”. The article focuses on case studies that show the need to revise performance and lifecycle expectations based on actual operating conditions instead of original design parameters, particularly given the challenges and variability imposed by GT upgrades for higher output and lower turndown operation. Deeper knowledge of actual operating conditions and how they impact catalyst system performance sets the foundation for optimizing plant emissions performance.

With over 25 years of power industry experience, Environex understands the importance of evaluating catalyst performance at real world operating conditions, and that is why Full SCR System Evaluations provide the best value to our clients. Full SCR System Evaluations include a combination of catalyst testing, operating data analysis, and physical system inspection that enables us to distinguish system problems from catalyst problems. Laboratory testing of the catalyst across the range of plant operating conditions in conjunction with the data analysis allows us to identify the limiting operating case for your system and evaluate design and operating adjustments that can improve plant emissions performance.

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Operating Data Analysis: Before and After Upgrade

Posted by eking in industrial catalyst services, NOx, operating data analysis, selective catalytic reduction, 0 comments

Why should I test multiple SCR samples?

Taking multiple samples ensures accurate and actionable results.

In the real operating environment of an SCR catalyst, exhaust gas temperatures, flows, and other factors vary across the catalyst cross-section. These differences cause non-uniform wear and tear on the catalyst. Uncontrolled thermal events and poisons entrained in the exhaust can cause irreversible damage to the catalyst which cannot be seen by the naked eye. Furthermore, as-manufactured variability in catalyst activity may cause single-sample testing to misrepresent the bulk catalyst activity level.

For these reasons, Environex recommends a full system evaluation which includes testing multiple samples from the inlet and outlet sides of the catalyst. This ensures that the catalyst test results are representative of the actual condition of the bulk catalyst in a way that single-sample testing cannot. These results, particularly when combined with operating data analysis, provide a secure foundation from which to make future catalyst maintenance and replacement plans. This level of analysis minimizes the risk of unplanned catalyst maintenance or replacement, which can help you avoid costly environmental fines, forced plant downtime, and expensive expediting costs.

There are some instances when single sample testing may be appropriate. Baseline testing of a new catalyst, interim testing between full system evaluations, and post-mortem failure analysis of a spent catalyst are the most common cases where single sample testing is acceptable.

Posted by eking in industrial catalyst services, selective catalytic reduction, 0 comments