Heat recovery steam generators for energy conservation

Abstract

Energy engineers cogeneration feasibility and consultants studies often come involved in across the problem of determining the gas and steam-water temperature profile and the steam generation potential in the Heat Recovery Steam Generator (HRSG).

Two important variables that effect the temperature profile and steam flow are the Pinch Point (PP) and the Approach Point (AP). Although the final selection of these parameters is determined by the size and cost of the HRSG, their effect on steam flow and temperature profile must often be evaluated in early engineering stages.

Analysis of HRSG is no doubt a tedious and time consuming task. The routine "HGPRO" developed in this report presents a simplified approach to determine the steam f low, duties of various heat transfer surfaces, and temperature profile in an unfired HRSG. The user can acquire all the required information on the performance of the HRSG without actually doing the mechanical design. Also, the additional power generation potential from the steam generated in the HRSG can be estimated using the routine.