Performance Analysis of Steam Power Plants Using Ideal Reheat-Rankin Cycle (original) (raw)
Related papers
IMPROVE STEAM TURBINE EFFICIENCY BY USE OF REHEAT RANKINE CYCLE
Steam are a major energy consumer. Optimising process operating conditions can considerably improve turbine water rate, which in turn will significantly reduce energy re quirement. Various operating parameters affect condensing and back pressure turbine steam consumption and efficiency.This paper cantaint the effect of opertating condition of turbine back pressure turbine inlet steam tempreture and adavantage of improving inlet steam tempreture by reheat cycle on the efficiency of steam turbine and total energy production of power plant.
Impact of the cold end operating conditions on energy efficiency of the steam power plants
Thermal …, 2010
The conventional steam power plant working under the Rankine Cycle and the steam condenser as a heat sink and the steam boiler as a heat source have the same importance for the power plant operating process. Energy efficiency of the coal fired power plant strongly depends on its turbine-condenser system operation mode. For the given thermal power plant configuration, cooling water temperature or/and flow rate change generate alterations in the condenser pressure. Those changes have great influence on the energy efficiency of the plant. This paper focuses on the influence of the cooling water temperature and flow rate on the condenser performance, and thus on the specific heat rate of the coal fired plant and its energy efficiency. Reference plant is working under turbine-follow mode with an open cycle cooling system. Analysis is done using thermodynamic theory, in order to define heat load dependence on the cooling water temperature and flow rate. Having these correlations, for given cooling water temperature it is possible to determine optimal flow rate of the cooling water in order to achieve an optimal condensing pressure, and thus, optimal energy efficiency of the plant. Obtained results could be used as useful guidelines in improving existing power plants performances and also in design of the new power plants.
IRJET, 2022
Vapor power cycles are used in steam power plants. In a vapour power cycle heat energy (released by the burning of fuel) is converted into work (shaft work), in which a working fluid repeatedly performs a succession of processes. In a vapour power cycle, the working fluid is water, which undergoes a change of phase. Among the various types of vapor power cycles is the Carnot cycle, which is theoretically the most efficient cycle and sets the limit for the efficiency of any vapor cycle. This limit is known as the Carnot limit. The Rankine cycle and its modifications are used widely and are theoretically the cycles best suited to steam power plants. By studying these cycles, we know practically what all must be done to increase the efficiency and cost effectiveness.
An analysis of a thermal power plant working on a Rankine cycle: A theoretical investigation
Journal of Energy in Southern …, 2008
Today, most of the electricity produced throughout the world is from steam power plants. However, electricity is being produced by some other power generation sources such as hydropower, gas power, bio-gas power, solar cells, etc. One newly developed method of electricity generation is the Magneto hydro dynamic power plant. This paper deals with steam cycles used in power plants. Thermodynamic analysis of the Rankine cycle has been undertaken to enhance the efficiency and reliability of steam power plants. The thermodynamic deviations resulting in non-ideal or irreversible functioning of various steam power plant components have been identified. A comparative study between the Carnot cycle and Rankine cycle efficiency has been analyzed resulting in the introduction of regeneration in the Rankine cycle. Factors affecting efficiency of the Rankine cycle have been identified and analyzed for improved working of thermal power plants.
Thermal Analysis of Steam Turbine Power Plants
Steam are a major energy consumer. Optimising process operating conditions can considerably improve turbine water rate, which in turn will significantly reduce energy requirement. Various operating parameters affect condensing and back pressure turbine steam consumption and efficiency. The industrial sector is the largest energy consumer, accounting for about 30 % of total energy used. Fuel and energy prices are continuously rising. With the present trend of energy prices and scarcity of hydrocarbon resources lowering energy requirement is a top priority. Energy conservation benefits depend on the adopting minor or major modifications and using the latest technology. Turbines are designed for a particular operating conditions like steam inlet pressure, steam inlet temperature and turbine exhaust pressure/ exhaust vacuum, which affects the performance of the turbines in a significant way. Variations in these parameters affects the steam consumption in the turbines and also the turbine efficiency. The present study was done to improve the power output of the turbine, thermal efficiency and specific steam consumption in conventional steam power plants. Three cycles i.e regenerative cycle, superheater cycle and cogeneration cycle are considered to formulate the data and obtain a better result in steam turbine power plants.
The Design and Optimization of a Steam Turbine Cycle using Reheating and Regeneration
The purpose of this project is to design and optimize a steam turbine cycle given an inlet pressure and power requirement. The ideal steam turbine cycle is known as the Rankine cycle. In order to increase the efficiency of the Rankine cycle, heat should be added at a high temperature and/or removed at a low temperature. Using thermodynamics, the concepts of reheating and regeneration are applied to increase the efficiency of the Rankine cycle. Reheating is the idea of reheating the steam after it has gone through the turbine. Regeneration is the concept of adding feed water heaters that extract steam from the turbine for heating water exiting the condenser, therefore requiring less work for the compressor.
A thermal-economic analysis of a transcritical Rankine power cycle with reheat enhancement using a low-grade industrial waste heat is presented. Under the identical operating conditions, the reheat cycle is compared to the non-reheat baseline cycle with respect to the specific net power output, the thermal efficiency, the heat exchanger area, and the total capital costs of the systems. Detailed parametric effects are investigated in order to maximize the cycle performance and minimize the system unit cost per net work output. The main results show that the value of the optimum reheat pressure maximizing the specific net work output is approximately equal to the one that causes the same expansion ratio across each stage turbine. Relative performance improvement by reheat process over the baseline is augmented with an increase of the high pressure but a decrease of the turbine inlet temperature. Enhancement for the specific net work output is more significant than that for the thermal efficiency under each condition, because total heat input is increased in the reheat cycle for the reheat process. The economic analysis reveals that the respective optimal high pressures minimizing the unit heat exchanger area and system cost are much lower than that maximizing the energy performance. The comparative analysis identifies the range of operating conditions when the proposed reheat cycle is more cost effective than the baseline. Copyright © 2012 John Wiley & Sons, Ltd.
Thermal Analysis of Steam Turbine Power Plants.pdf
Steam are a major energy consumer. Optimising process operating conditions can considerably improve turbine water rate, which in turn will significantly reduce energy requirement. Various operating parameters affect condensing and back pressure turbine steam consumption and efficiency. The industrial sector is the largest energy consumer, accounting for about 30 % of total energy used. Fuel and energy prices are continuously rising. With the present trend of energy prices and scarcity of hydrocarbon resources lowering energy requirement is a top priority. Energy conservation benefits depend on the adopting minor or major modifications and using the latest technology. Turbines are designed for a particular operating conditions like steam inlet pressure, steam inlet temperature and turbine exhaust pressure/ exhaust vacuum, which affects the performance of the turbines in a significant way. Variations in these parameters affects the steam consumption in the turbines and also the turbine efficiency. The present study was done to improve the power output of the turbine, thermal efficiency and specific steam consumption in conventional steam power plants. Three cycles i.e regenerative cycle, superheater cycle and cogeneration cycle are considered to formulate the data and obtain a better result in steam turbine power plants.
Determination of optimum reheat pressures for single and double reheat irreversible Rankine cycle
Sockks, 2011
This paper reports thermodynamic optimisations based on the maximum net cycle work and the maximum thermal efficiency criteria for an irreversible single and double reheat Rankine cycle, which includes the internal irreversibilities resulting from the adiabatic processes. The study encompasses the effects of boiler pressure and temperature on the general and optimal performances of the plant in terms of net work output and thermal efficiency. Therefore, the net work output and thermal efficiency of the plant are obtained by introducing the mechanical, boiler and isentropic efficiencies. The effects of boiler pressure and temperature on the optimal reheat pressures of the single and double reheat Rankine cycles are also investigated. It is shown that for the theoretical Rankine cycle, the optimal reheat pressures of single and double reheat Rankine cycle are both fairly affected by the boiler pressure and temperature.