SCR Operation & Maintenance Upgrade Solutions
Beyond the assessment:
improving the future
Asset management planning and catalyst lifetime extension have two key objectives: first, to identify non-catalyst improvement potential, which could lead to the extension of catalyst lifetime without touching the catalyst, and second, to realistically forecast and quantify remaining catalyst lifetime in excess of the OEM guarantee, to achieve significant cost savings. Once improvement measures have been identified, ReNOx can provide the best combination of services and supply tailor made new or regenerated catalysts to achieve the lowest total cost of ownership of your SCR.
- AIG tuning
- SCR cleaning upgrade
- NH3 control and monitoring
- SCR flow distribution
- Supply of catalyst solutions
Tuning the ammonia injection grid (AIG) is essential for long catalyst lifetime. Indeed, when ammonia is not injected according to the NOx distribution profile, different areas of the catalyst show either an excess or shortfall of ammonia compared to NOx. The consequence is a combination of higher NH3 slip and/or higher NOx, leading to extra costs, despite the potential for the catalyst to continue to control both NH3 and NOx emissions.
Tuning the ammonia injection grid (AIG)
is essential for long catalyst lifetime.
In-Situ SCR reactor cleaning solutions
Catalyst plugging is a typical issue for SCR technology. It leads to:
- higher power costs due to extra pressure drop
- higher catalyst costs due to reduced availability of catalyst pores
- higher outage costs due to increased outage frequency
- higher ammonia costs due to reduced catalyst performance
- increased erosion or delamination of catalyst material and/or higher cost for regeneration due to erosion or delamination of catalyst material
We have the experience to identify the root cause of catalyst plugging and offer a clear solution which can combine SCR flow modeling, catalyst redesign and enhanced O&M of current cleaning systems. Combine this with our in-situ SCR catalyst cleaning technics, our custom solution will deliver the lowest possible total cost of ownership. Our approach has been successfully used in diverse applications (coal, waste, glass, oil, etc.) and implemented in more than 70 plus different reactors in North America.
Problematic plugging of an SCR catalyst layer with fly ash.
NH3 control and monitoring solutions
State-of-the-art NH3 injection control logic is important in keeping NH3 costs to the minimum while achieving the required NOx emission levels. In addition, NH3 slip monitoring is an effective way to detect non-catalyst related issues when combined with catalyst testing results. ReNOx can put its experience at your service to implement or improve these two aspects, based on our SCR expertise and extensive knowledge in the areas of I&C, emission measurement and chemical analysis.
I&C aspects are also levers that can be used to optimize a deNOx installation,
with in particular the optimization of the NH3 injection control
Regarding NH3 slip monitoring, ReNOx can support with on-line or off-line analytical equipment, related analytical procedures and training of plant staff.
SCR flow distribution solutions
Optimum distribution of flow, ash and NOx emissions is key for high performance SCR. Suboptimal design can lead to increased NH3, erosion and plugging costs. We are your ideal independent partner to help you find the root cause of distribution issues and to propose clear custom solutions. Our complete confidence arises from our long experience in this field and our particular expertise in flow modelling and Computational Fluid Dynamics (CFD).
Inadequate flow rate distribution can lead to severe erosion problems of the catalyst.
Our prime focus is to postpone as far as possible the costly replacement of SCR catalysts. Nevertheless, sooner or later, some action in relation to the catalyst will be required. Depending on specific plant conditions, ReNOx can supply the two following options:
- Supply of regenerated catalyst
- Supply of new catalyst
In some situations, regenerated catalyst can be a cost-effective solution, although this option must be considered carefully, taking feasibility, quality and performance criteria fully into account. Where it is feasible, and the risks are acceptable, catalyst regeneration can be the best option to achieve the lowest possible total cost of SCR ownership.
In other situations, regenerating catalyst is either not feasible or not compatible with the expected quality or risk profile of the SCR plant. In such cases, the option of purchasing a new catalyst is then the single alternative. ReNOx can supply the most suitable new or regenerated SCR catalyst depending on the application and your specific SCR challenges.
ReNOx is your independent partner, and therefore not biased in favour of any particular new or regenerated catalyst, as typically the case with catalyst manufacturers . With our 25 years’ experience in the field, and specific knowledge of your SCR asset, we can integrate the best catalyst solution for your expectations, focusing on the lowest possible total cost of ownership.