SCR Systems
Selective Catalytic Reduction
Peerless Emissions Management engineers Selective Catalytic Reduction systems that reduce NOx emissions from gas turbines, HRSGs and boilers and industrial combustion systems to meet the tightest permit limits, without disrupting plant operations. Every system is engineered to the specific operating parameters and space availability of the facility it serves.
PEERLESS EMISSIONS
One Partner. Full System Ownership.
Single-Source Performance Warranty.
COMPREHENSIVE SOLUTIONS
Peerless delivers comprehensive DeNOx system solutions, including design, supply, installation supervision and start-up services for SCR systems.
DECADES OF EXPERIENCE
Peerless in-house engineering, design and computational fluid dynamics (CFD) departments leverage decades of experience to engineer the right solution for each plant.
PERFORMANCE WARRANTY
Through complete integration of the ammonia system, catalyst and system processes, Peerless provides a single-source performance warranty that’s unrivaled in the industry.
Selective Catalytic Reduction
SCR Technologies
SCR TECHNOLOGY
PATENTED Direct Injection SCR
Direct Injection SCR supplies ammonia or urea vapor directly to the SCR system’s gas path without the need for a separate vaporization system or ammonia injection grid, reducing equipment count and operating cost. Both aqueous ammonia and urea-based direct injection configurations are available, and specialty catalyst designs can be applied to reduce NOx and CO in a single catalyst layer.
This approach has been used to replace aging or high-maintenance emissions systems, including retrofits on 20-60 MW gas turbine utility units in both simple cycle and combined cycle plants, an 800 MW utility boiler and a wide range of industrial boiler facilities. Patented Peerless Direct Injection SCR can be provided as a complete package for a new unit or as a retrofit. Retrofitting Direct Injection SCR can be done by replacing only the ammonia injection system, or as a full SCR package
SCR TECHNOLOGY
EDGE® Ammonia Injection Grid (AIG)
The patented Peerless EDGE® AIG lance design improves ammonia distribution and is inherently less susceptible to plugging. Turbulent mixing and enhanced jet penetration of ammonia into the exhaust stream improve mixing and distribution, directly improving SCR performance, while the cross-sectional shape of the lance resists the plugging that shortens the life of conventional designs.
Specific EDGE® AIG retrofits have resulted in reduced ammonia consumption by 30-40% at a 1,250 MW combined-cycle power plant in the southeastern United States, 15-35% ammonia consumption across nine units in the gulf region and SCR efficiency increase for NOx, Ammonia Slip and Ammonia consumption at a major utility in Florida. In all cases SCR catalyst life is extended and SCR maintenance has been reduced.
SCR TECHNOLOGY
Urea as an SCR Reagent
Selecting an SCR reagent is a balance of cost, benefit and risk. Anhydrous ammonia is concentrated ammonia with a purity level of 99.95% and is stored as a liquid under pressure, while aqueous ammonia is typically 19-29% ammonia by weight and is stored under low pressure. Aqueous urea is a mixture of urea prills or powder with water. It is stored in an atmospheric tank, is available in 32%, 40% and 50% solutions and carries less transportation and permitting risk.
Urea can be used with Peerless Direct Injection SCR and RASCR™ systems. RASCR™ can be used with all reagent solutions including urea. For plants currently operating on ammonia, Peerless provides reagent conversions that increase site safety. Converting from anhydrous ammonia to aqueous ammonia or aqueous urea requires the addition of a fluid handling skid and vaporizer system. The existing tank may be repurposed for aqueous ammonia, and tank condition and storage capacity are key considerations. Converting from aqueous ammonia to aqueous urea further increases site safety.
SCR TECHNOLOGY
RASCR™ (Rapid Advantage SCR)
RASCR™ is built for gas turbine plants that cycle frequently to balance renewable generation, where fast, reliable ammonia vaporization during startup and load transients is critical to staying compliant. RASCR™ vaporizes ammonia in less than five minutes from gas turbine start, with auxiliary load roughly 80% lower than electric vaporization systems, tighter ammonia slip control and faster startup times. It is designed for easy retrofit into an existing vapor ammonia discharge line during a short outage, integrates with existing fuel sources and can be configured as a standalone system or a redundant backup with dual fuel capability.
Selective Catalytic Reduction
Just Say NOx
Post-combustion emissions control technologies reducing NOx, CO, VOC, NH3, PM and other government-regulated requirements. As part of the energy transition, utilities are retrofitting simple and combined-cycle power plants to provide customers with safer, cleaner, more efficient and reliable power.
Retrofit Technologies and Aftermarket Services
When an SCR system underperforms, the root cause often lies in one component while the effects present across the whole system. Peerless is a one-stop partner for total SCR system design and optimization, drawing on extensive experience with complicated retrofit projects to help plants improve performance while avoiding unnecessary maintenance costs and outages.
Broader engineering support spans CFD modeling and flow analysis, emissions consulting, engineering assessments, equipment upgrade ROI analysis, on-site technical advisory engineers and operator training.
Retrofits Delivering Measurable Results
Less Ammonia, Longer Catalyst Life
A turnkey EDGE® AIG retrofit at a 1,250 MW combined-cycle plant cut ammonia usage by 30-40% while improving NOx control and extending catalyst life. At CLECO’s Acadia Generating Station, EDGE® retrofits across nine units reduced ammonia consumption by 15-35% and are projected to extend time to catalyst replacement by two to three years.
DIRECT INJECTION DELIVERS ULTRA-LOW NOx
At Ingredion’s Argo facility, a direct injection SCR and CO system held NOx below 10ppm and CO below 10ppm across a 10-110% load range, a greater than 90% reduction. In Direct Injection SCR Retrofit on 2 HRSG’s for a Northern California utility, the new urea-based direct injection system reduced NOx by 87-95% while increasing total plant output by reducing back pressure on the gas turbine.
