IJERT-Performance Analysis of a Heat Recovery Steam Generator (original) (raw)
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Thermodynamic Analysis of Triple Pressure Heat Recovery Steam Generator
Thermodynamic analysis of the triple pressure reheat combined cycle gas turbine with duct burner are presented and discussed in this paper .The overall performance of a combined cycle Gas turbine power plant is influenced by the ambient temperature and turbine inlet temperature. These parameters affect the overall thermal efficiency, power output .The ambient temperature increases the gas temperature and also the individual steam production rate also increased at each stage of the turbine. The exergy is used to evaluate maximum irreversibility of the process present in the cycle.
Design methodology of heat recovery steam generator in electric utility for waste heat recovery
International Journal of Low-Carbon Technologies
Heat recovery steam generators (HRSGs) are important components for industrial waste heat recovery, and any changes in their design directly affect the performance of the steam cycle, and thus the performance of the combined cycle power plant. The present research is focused on the design of a HRSG, including a dual-pressure steam generator cycle that is intended for use in a typical gas turbine unit having a power output of 60 MW. The results show that the maximum heat transfer occurs in the evaporator section for high-pressure levels, and in the economizer section for low-pressure levels. The optimum design pressure for the high-pressure level of the steam generator was found to be 100 bar, while that for the low-pressure level was found to be 10 bar. An exergy analysis was performed for the different processes and components of the steam cycle, including the HRSG. Calculations show that the overall exergy loss is about 35%, out of which 16% is lost in flue gasses and 10% is lost in heat exchanger, and the remainder was converted into 35 MW of useful work.
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.
Optimum configuration for single pressure (SP), dual pressure (DP) and triple pressure (TP) heat recovery steam generator (HRSG) is presented to improve heat recovery and thereby exergy efficiency of combined cycle. Deaerator was added to enhance efficiency and remove dissolved gases in feed water. A new method was introduced to evaluate low pressure (LP) and intermediate pressure (IP) in HRSG from local flue gas temperature to get minimum possible temperature difference in heaters instead of a usual fixation of pressures. Optimum location for deaerator was found at 1, 3 and 5 bar respectively for SP, DP and TP in heat recovery at a high pressure (HP) of 200 bar. Results also showed optimum pressure for air compression and steam reheater by means of three categories of heat recovery.
Performance Assessment of Heat Recovery Steam Generator at District Cooling Plant
2015
Heat Recovery Steam Generators are important components in cogeneration plants. The steam produced by the Heat Recovery Steam Generator is used to produce chilled water at a District Cooling plant. The performance of the Heat Recovery Steam Generator will affect the performance of the overall District Cooling plant. This study presents the performance of the Heat Recovery Steam Generator which is based on the first and second laws of the thermodynamic principle. The following parameters, energy efficiency, exergy efficiency, exergy of fuel, exergy of product and exergy destruction of the Heat Recovery Steam Generator were analysed. The results showed that as the mass flow rate of fuel increased, the energy and exergy efficiencies of the Heat Recovery Steam Generator increased. From the results of the exergy analysis, the exergy destruction indicated the presence of the inefficiencies of the Heat Recovery Steam Generator. In order to obtain a higher performance of the Heat Recovery S...
Thermodynamic analysis of heat recovery steam generator in combined cycle power plant
Thermal Science, 2007
Original scientific paper UDC: 536.255 BIBLID: 0354-9836, 11 (2007), 4, 143-156 Com bined cy cle power plants play an im por tant role in the pres ent en ergy sec tor. The main chal lenge in de sign ing a com bined cy cle power plant is proper uti li za tion of gas tur bine ex haust heat in the steam cy cle in or der to achieve op ti mum steam tur bine out put. Most of the com bined cy cle de vel opers fo cused on the gas tur bine out put and ne glected the role of the heat recov ery steam gen er a tor which strongly af fects the over all per for mance of the com bined cy cle power plant. The pres ent pa per is aimed at op ti mal uti liza tion of the flue gas re cov ery heat with dif fer ent heat re cov ery steam gener a tor con fig u ra tions of sin gle pres sure and dual pres sure. The com bined cy cle ef fi ciency with dif fer ent heat re cov ery steam gen er a tor con fig u ra tions have been ana lysed parametrically by us ing first law and sec ond law of ther mo dy nam ics. It is ob served that in the dual cy cle high pres sure steam tur bine pres sure must be high and low pres sure steam tur bine pres sure must be low for better heat re cov ery from heat re cov ery steam gen er a tor.
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.
Effect of Ambient Air Temperature on the Performance of Steam Generator
International journal of environmental science and development, 2017
The aim of this research is to investigate the effect of ambient air temperature on the steam generation. A parametric study was performed based on exergy analysis to study the impact of ambient air temperature on second law of efficiency, irreversibility and adiabatic flame temperature of steam generation. The results showed that at 25 percent excess air and with the range of ambient air temperature from 25 oC to 100 oC, the adiabatic flame temperature increases from 2015 oC to 2065 oC. Also the results showed that the second law efficiency and irreversibility ranges from 40.295% to 40.290% and 494.063 MJ to 494.161 MJ, respectively as the ambient air temperature increases from 25 oC to 100 oC. It is included that the ambient air temperature has a minimum impact on adiabatic flame temperature and insignificant impact on both the second law efficiency and irreversibility of overall steam generation. Also the combustion chamber and heat transfer sections of steam generation were studied by using exergy analysis. It was concluded that the ambient air temperature has a minimum impact on both combustion chamber and heat transfer sections.
Thermo-economic analysis of a heat recovery steam generator combined cycle
Nigerian Journal of Technology, 2019
A significant amount of energy gets lost through the exhaust of simple gas turbine plants, more often than not, this energy can be used to run another power cycle or a combined heat and power setup, leading to an increase in the overall efficiency of the plant, reduce air pollution and energy wastage. In this study, a retrofitted performance analysis of incorporating a steam power cycle to the existing gas turbine cycle in Delta IV power station is carried out, the analysis is carried out using first law of thermodynamics and energy cost comparison to describe the effect of combining both cycles on power output, thermal efficiency and energy cost. Operating data were obtained from existing gas thermal plant in Ughelli (Delta IV) and steam thermal plant in Lagos (Egbin). Preliminary assessment shows that power output increases by a further 51.5MW, thus raising the overall combined efficiency to 41.85%. Analysis on cost savings accruable from incorporating a heat recovery steam generation was also done and significant savings in cost was obtained.
Changes of heat exchangers layout in heat recovery steam generator (HRSG) will modify the amount of waste heat recovered from flue gas; this brings forward a desire for the optimization of the design of HRSG. In this paper the model of multi-pressure HRSG is built, and an instance of a dual pressure HRSG under three different layouts of Taihu Boiler Co., Ltd. is discussed, with specified values of inlet temperature, mass flow rate, composition of flue gas and water/steam parameters as temperature, pressure etc., steam mass flow rate and heat efficiency of different heat exchangers layout of HRSG are analyzed. This analysis is based on the laws of thermodynamics and incorporated into the energy balance equations for the heat exchangers. In the conclusion, the results of the steam mass flow rate, heat efficiency obtained for three heat exchangers layout of HRSGs are compared. The results show that the optimization of heat exchangers layout of HRSGs has a great significance for waste heat recovery and energy conservation.