Thermodynamic modeling and optimization of multi-pressure heat recovery steam generator in combined power cycle (original) (raw)
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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.
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.
Thermodynamic modelling and optimization of a dual pressure reheat combined power cycle
Sadhana, 2010
Heat recovery steam generator (HRSG) plays a key role on performance of combined cycle (CC). In this work, attention was focused on a dual pressure reheat (DPRH) HRSG to maximize the heat recovery and hence performance of CC. Deaerator, an essential open feed water heater in steam bottoming cycle was located to enhance the efficiency and remove the dissolved gasses in feedwater. Each of the heating section in HRSG is solved from the local flue gas condition with an aim of getting minimum possible temperature difference. For high performance, better conditions for compressor, HRSG sections, steam reheater and deaerator are developed. The CC system is optimized at a gas turbine inlet temperature of 1400•C due to the present available technology of modern gas turbine blade cooling systems. The exergetic losses in CC system are compared with each other. The present DPRH HRSG model has been compared and validated with the plant and published data.
The aim of this work is to develop a method for optimization of operating parameters of a triple pressure heat recovery steam generator. Two types of optimization: (a) thermodynamic and (b) thermoeconomic were performed. The purpose of the thermodynamic optimization is to maximize the efficiency of the plant. The selected objective for this purpose is minimization of the exergy destruction in the heat recovery steam generator. The purpose of the thermoeconomic optimization is to decrease the production cost of electricity. Here, the total annual cost of heat recovery steam generator, defined as a sum of annual values of the capital costs and the cost of the exergy destruction, is selected as the objective function. The optimal values of the most influencing variables are obtained by minimizing the objective function while satisfying a group of constraints. The optimization algorithm is developed and tested on a case of combined cycle gas turbine plant with complex configuration. Six operating parameters were subject of optimization: pressures and pinch point temperatures of every three (high, intermediate, and low pressure) steam stream. The influence of these variables on the objective function and production cost are investigated in detail. The differences between results of thermodynamic and the thermoeconomic optimization are discussed.
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.
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.
Off Design Performance Analysis of a Triple Pressure Reheat Heat Recovery Steam Generator
Operating characteristics of a triple pressure reheat HRSG at design and off-design mode has been analyzed and the effect of exogenous variables such as power load, process requirements, and operating mode, etc., on the transient performance of the plant is studied. By changing the arrangement of High-Temperature and Intermediate-Temperature zone components of the HRSG, its effect on the Steam Turbine performance and HRSG characteristics is examined in this paper. It is shown that there could be a significant difference in HRSG sizes even though thermal performance is not in great deviation. From steam turbine performance point of view, it should be carefully reviewed whether the optimum design point could exist or not. Off-design performance could be one of the main factors in arranging components of the HRSG because power plants operate at various off-design conditions such as ambient temperature and gas turbine load, etc. It is shown that different Heat Exchanger configurations lead to different performances with ambient temperature, even though they have almost the same performances at design points.
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.
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.