Mathematical Modelling of HRSG Using Pinch Principle

Abstract

Energy Requirement for a country like India is expanding continuously. On this date, 70% of energy requirement is fulfilled by thermal power plant in India. Energy requirement has been expanded around 10% in last 10 years. Hence, engineers and researchers are trying hard to improve performance of plant. Combined Cycle Power Plant (CCPP) is generating power from steam cycle by using waste heat of gas cycle. In CCPP, Heat Recovery Steam Generator (HRSG) is major focus of researchers due to scope of improvement for performance improvement There are various methods for parametric optimization of heat recovery steam generator like exergy analysis, thermo-economic approach etc. Pinch Methodology is used as mathematical modelling tool. Generally, Dual pressure CCPP is used for low power generation capacity below 300 MW and Triple pressure CCPP is for higher range above 350 MW. For present study, Dual pressure and Triple pressure HRSG analysis is done with available literature data. The analysis includes pinch analysis, area analysis and cost using different pinch magnitudes. This analysis will helpful in selecting optimized range of different parameters for safer operation, high durability of components and higher power output etc. This analysis is extended for already existing running power plant data. The data such as pressure and temperature of HRSG components, mass flow rates, gas turbine and steam turbine output etc. are collected from CCPP at GSEG, Hazira, Surat for a week. The Pinch methodology is applied to the data to achieve optimum performance in terms of higher reliability of power plant, less pollution, well thermally designed equipments etc. The detailed analysis is used for economical enhancement of performance of power plant.