Recently CMI completed a Heat Recovery Steam Generator for a 400 MW standard block CCPP in France, for which ASME code was used for the HRSG design. Regarding that project, CMI conducted an internal review based on the EuroNorm instead of the ASME code. The purpose of this exercise was to study and compare advantages and design features of ASME code versus EuroNorm. This paper presents the conclusions of the comparison and review that were undertaken.

The paper presents work done to develop a CFD model for analyzing the velocity and temperature distribution of HRSG systems with a single angle roof, a dual angle roof, and an air flow optimized evase. Particularly, attention was given to the critical areas of the HRSG, which include the evase, the first heat exchanger bundle, and upstream and downstream of the duct burner. On the basis of the all analyses, the air flow optimized evase was found to be very effective in establishing a uniform velocity distribution into the first heat exchanger bundles (superheater 3 and reheater 2) and in reducing the pressure drop through the whole HRSG system, which is of benefit to gas turbine operation.

Combined cycle plants must supply electrical power to the grid as and when needed with consequent day/night and weekday/weekend cycling. Plants have to come on and off line with minimal notice and sometimes run at partial loads. European vertical HRSGs designed to permit the tubes to expand and contract freely and independently are able to minimize fatigue stresses related to cycling. This paper presents solutions to HRSG design issues for cycling tolerant operation. It relates to published data on problems observed with cycling horizontal HRSGs, and it describes how these problems can be overcome. Concepts, design features and calculation methods applied to cycling tolerant HRSGs are reviewed in detail.

The following white paper concerns the implementation of advanced energy solutions enabling industrial power generators to optimize plant processes, increase energy efficiency, reduce greenhouse gas emissions and manage their external power contracts- and subsequently enhance their business results.