VERTICAL HEAT RECOVERY STEAM GENERATOR
EMISSIONS RETROFIT
UNIQUE OPPORTUNITIES FOR THIS PROJECT INCLUDED:
-
Hot and warm casing design (over 750°F). Knowing what materials to use in high-temperature service is key for the successful long-term use of cycled power generation equipment. Thermal growth considerations have to be considered when dealing with structures and equipment in high-temperature service.
-
Shipping and lifting requirements. To be competitive in the marketplace, manufacturers look to minimize field erection labor of large equipment; understanding shipping and lifting requirements are key for the successful and economical modularization of a project. Developing weights and centers of gravity along with lifting and shipping supports for equipment is a must for complex equipment.
-
Foreign sourcing for module box fabrication. Understanding foreign material specifications and structural shapes are key to quickly generating designs that can be produced in the global fabrication marketplace.
A Heat Recovery Steam Generator (HRSG) manufacturer consulted with Brown + Kubican, PSC (BK) for professional structural engineering services for the design of (2) ~ 115ft tall vertical HRSGs at a US power generating station. Due to the ever-increasing emission requirements, the utility provider needed to tighten emissions around existing infrastructure. The solution developed by the HRSG manufacturer was to install a sophisticated pollution control system into the gas path of the existing Combined Cycle HRSG units. By doing so, unique challenges were presented in regards to the reuse of the existing heating surface. Ultimately, only the steam drum and economizer module box were salvaged for reuse, and (2) new module boxes were needed for the tight control of gas path temperature entering the Ammonia Injection Grid (AIG) and Selective Catalytic Reduction (SCR) catalyst system.
BK provided structural design of the Superheater/Evaporator and the Evaporator module boxes and their heating surface tubesheet supports. We provided structural design for the AIG/SCR duct complete with a SCR Catalyst Block support frame and internal monorail frames. BK provided structural design of the outlet stack complete with platforms, stairs, and ladders to facilitate access to the outlet damper and Continuous Emission Monitoring System (CEMS) ports. Additional platforming and stair towers were designed with shipping and erection restrictions in mind to facilitate the owner’s access needs.
At Brown + Kubican, PSC we are ready for your complex industrial project needs.
ADDITIONAL PROJECT PHOTOS
