Design of Heat-Recovery Steam Generator Components in Gas Turbine (70 MW) Combined Cycle Power Plants (105 MW) (original) (raw)
Related papers
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.
SIMULATION OF A HEAT RECOVERY STEAM GENERATOR OPERATING IN A COMBINED CYCLE PLANT
The heavy duty gas turbines evolution led to higher efficiencies with consequent higher exhaust temperatures. Thus, more complex heat recovery steam generators were developed in order to maximize the use of that energy potential. Therefore, computational models capable to predict the operational conditions of the equipment may be needed in order to analyze the system behavior for different situations. This article describes a computational model able to simulate the off-design behavior of a heat recovery steam generator (HRSG) operation in a combined cycle power plant. The model was developed so that it can be used in both model-based diagnostics systems and performance evaluation systems. Each heat exchanger inside the HRSG was designed individually and arranged according to the analyzed equipment. The computer code's architecture was built in such a way that it can be easily changed, allowing the analysis of other HRSG's configurations with simple structural changes, given the program's modularity. In order to deal with the lack of details of the power plant equipment, which means not enough geometrical information of each heat exchanger, a generic algorithm tool was used to calibrate the heat exchangers models using only the measured data of the power plant SCADA. The developed program was validated against operational data from a real plant and showed satisfactory results, confirming the robustness of this model.
IJERT-Performance Analysis of a Heat Recovery Steam Generator
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/performance-analysis-of-a-heat-recovery-steam-generator https://www.ijert.org/research/performance-analysis-of-a-heat-recovery-steam-generator-IJERTV3IS120451.pdf In view of the energy crisis, the heat recovery system at any stage is very much important is the field of conservation of energy. The Heat Recovery steam Generator is one of the Critical components is the combined cycle (Gas Turbine cycle and Steam Power cycle) and is the most efficient energy conversation system in recent trends. Its function is to recover the waste heat present in the exhaust Gases of the Gas turbine cycle and to generate the steam to run a steam power cycle. This is an attempt to provide some information in this direction for the next Generation. This work deals with to study the Performance and analysis of a Triple pressure Heat recovery steam generator in combined cycle power plant at different ambient conditions. The results shows that the Increase of ambient temperature Increases the Exhaust outlet temperature from the gas turbine and thus increases the heat content present in the flue gases. so it is possible to generate more amount of steam at high ambient temperatures. It is observed that the percentage of heat utilization increases because the inlet temperature of heat recovery Steam Generator increases with increase of ambient temperature. It is noticed that the percentage of heat utilization increases as 58.2%, 61%, 62.9% for the ambient temperatures of 15 0 c, 30 0 c, 45 0 c, respectively.
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
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.
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.
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.
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.
E3S web of conferences, 2024
The working principle of the combined cycle in the combined cycle power plant (CCPP) is to utilize a certain amount of waste heat in the gas turbine, which reaches temperatures of 1650°C, to generate steam in the steam turbine. Due to the high temperature of the exhaust gas in the gas turbine, a device is needed to recover this waste heat, known as a Heat Recovery Steam Generator (HRSG). Compared to conventional HRSG, a once-through heat recovery steam generator (OTHRSG) offers the advantages of faster design time (25% faster than conventional) and lower design costs because it does not require a drum which contributes to an increase in thermal efficiency. This study aims to model and simulate the CCPP system with an OTHRSG to achieve maximum thermal efficiency by using biogas from the degradation of organic waste as the input fuel for CCPP using Cycle Tempo software. The thermal efficiency of the CCPP system was achieved at 57% by applying turbine inlet temperature (TIT) of 1500°C and compression ratio of 46. These results proved that the CCPP system by using biogas as fuel could increase the thermal efficiency of a single cycle power plant.