HRSGs for Next Generation Combined Cycle Plants (original) (raw)
Related papers
International Journal of Mechanical Engineering and Robotics Research, 2021
The gas turbine combined cycle (GTCC) power plant system combination a gas power plant and a steam power plant using Brayton and Rankine cycles. In GTCC specification, the heat-recovery steam generator (HRSG) is employed as a heat exchanger to produce superheated steam. The utilization of waste heat is a need for sustainable energy use. This paper reviews research on the recovery of waste heat by designing and simulating an HRSG construction. Therefore, this study aims to create an HRSG with high (56 bar) and low (6 bar) pressure levels at a temperature of 500°C and 137.3 kg/s of gas turbines using simulation. The use of equations and design simulations can be applied to HRSG components with appropriate high and low pressure.
Background to the Design of HRSG Systems and Implications for CCGT Plant Cycling
2003
The principles which underlie the design of HRSG boilers for CCGT plant are outlined together with their effect on the susceptibility of HRSGs to plant cycling. The interaction between gas turbine and HRSG thermodynamics are described. Despite the marked increase in gas turbine inlet temperatures that has occurred over the past twenty years, there has only been a very slow rise in flue gas temperatures into HRSGs. The consequences of low flue gas temperatures is that HRSG plant is large in terms of steam generating ability and have also resulted in the need to generate the steam from two or more separate evaporators at different pressures. Boiler pinch point temperatures need to be in the 4°-12°C range for efficiency reasons, with most of the tubing in the HRSGs being finned for this reason It would seem that the preoccupation with heat transfer and HRSG size reduction has caused some additional problems. These are now well understood by designers and operators. However even during ...
Investigation of gas turbine efficiency Enhancement via HRSG using: lab view software
International Journal of Current Engineering and Technology, 2023
This paper concerns the study of the UBARI power plant, it consists of four single-cycle gas turbine units with a total capacity of 640 MW. As stated in the specification, the thermal efficiency is low (36.7%), the temperature is high (536°C), and the waste heat loss per MW unit is high (207.94). The aim is to address these issues, meet future electricity demand, and reduce harmful emissions to protect the environment due to the power plant's geographical location. The efficiency of generating high-pressure steam using waste heat in four steam blocks of four steam turbines was investigated. Examining the solution with LabVIEW shows: The capacity of each heat recovery steam generator is 62.16MW, that is, the total capacity of the power plant is about 4×222.16MW, and the total efficiency is (51.35%). In addition to reducing the heat loss of the exhaust gas. A good correlation can be obtained by relating the net capacity and gross efficiency of the combined plant to the operating parameters.
Energy Conversion and Management, 2016
Concise semi-theoretical, semi-empirical formulas are developed in this study to predict the off-design performance of the bottoming cycle of the gas-steam turbine combined cycle. The formulas merely refer to the key thermodynamic design parameters (full load parameters) of the bottoming cycle and off-design gas turbine exhaust temperature and flow, which are convenient in determining the overall performance of the bottoming cycle. First, a triple-pressure reheat heat recovery steam generator (HRSG) is modeled, and thermodynamic analysis is performed. Second, concise semi-theoretical, semi-empirical performance prediction formulas for the bottoming cycle are proposed through a comprehensive analysis of the heat transfer characteristics of the HRSG and the energy conversion characteristics of the steam turbine under the off-design condition. The concise formulas are found to be effective, i.e., fast, simple, and precise in obtaining the thermodynamic parameters for bottoming cycle efficiency, HRSG heat transfer capacity, HRSG efficiency, steam turbine power output, and steam turbine efficiency under the off-design condition. Accuracy is verified by comparing the concise formulas' calculation results with the simulation results and practical operation data under different load control strategies. The calculation errors are within 1.5% (mainly less than 1% for both simulation and actual operation data) under combined cycle load (gas turbine load) ranging from 50% to 100%. However, accuracy declines sharply when the turbine exhaust temperature seriously deviates from the design value and several specific operation strategies are employed when the units operate at ultra-low load (50% less combined cycle load/gas turbine load). The prediction results can be utilized as a relative reference. To improve prediction accuracy, a corresponding correction factor can be introduced for modification based on operating experience.
Parametric Evaluation of Heat Recovery Steam Generator (HRSG)
Heat Transfer-Asian Research, 2013
Thermal efficiency of a combined cycle power plant depends strongly on a heat recovery steam generator (HRSG), which is the link between the gas turbinebased topping cycle and steam turbine-based bottoming cycle. This work is based upon the design of physical parameters of a HRSG. In this article, the physical parameters of a HRSG have been considered to study their implications on HRSG design by comparing the existing plant design with an optimized plant design. Thermodynamic analysis of HRSG for the two designs gives important outcomes which are useful for power plant designers.
Optimization of heat recovery steam generators for combined cycle gas turbine power plants
Applied Thermal Engineering, 2001
The heat recovery steam generator (HRSG) is one of the few components of combined cycle gas turbine power plants tailored for each speci®c application. Any change in its design would directly aect all the variables of the cycle and therefore the availability of tools for its optimization is of the greatest relevance. This paper presents a method for the optimization of the HRSG based on the application of in¯uence coecients. The in¯uence coecients are a useful mathematical tool in design optimization problems. They are obtained after solving the equations of the system through the Newton±Raphson method. The main advantage of the proposed method is that it permits a better understanding of the in¯uence of the design parameters on the cycle performance. The study of the optimization of the distribution of the boiler area between its dierent components is presented as an example of the proposed technique. Ó