Numerical Model of Thermoelectric Topping Cycle of Coal-Fired Power Plant

2015 ◽  
Vol 137 (9) ◽  
Author(s):  
Armin K. Silaen ◽  
Bin Wu ◽  
Chenn Zhou ◽  
Kazuaki Yazawa ◽  
Ali Shakouri
Keyword(s):  
Power Plant ◽  
Numerical Model ◽  
Electrical Power ◽  
Flame Temperature ◽  
Rankine Cycle ◽  
Generation Process ◽  
Steam Turbines ◽  
Gas Temperature ◽  
Steam Temperature ◽  
Low Efficiency

Traditional fossil fuel power generation process typically has low efficiency. Large amount of the energy loss in Rankine cycle steam turbines (ST) is due to the temperature difference between the combustion flame temperature ∼2250 K (adiabatic) and the high pressure steam temperature up to 900 K. However, some of this energy can be harvested using solid-state thermoelectric (TE) power generators which are placed into the gap between the flame temperature and the steam temperature that produce additional electrical power. This study investigates the potential placement of TE on water tube wall inside a boiler at a coal-fired power plant. Three-dimensional (3D) numerical model of a simplified TE module is developed, and hot gas temperature and steam temperature from the boiler are used as boundary conditions at the hot side and cold side of the TE. The numerical results are compared with analytical calculations. The 3D effects of the thermal spreading in the TE module are investigated. Parameters such as TE leg cross section area and TE fill factor are examined in order to maximize the electrical power production of the TE without sacrificing the boiler efficiency (i.e., reducing the steam temperature). The study also looks into the various locations inside the boiler that have good potential for TE installation.

Numerical Model of Thermoelectric Topping Cycle of Coal Fired Power Plant

2013 ◽  
Author(s):  
Armin Silaen ◽  
Bin Wu ◽  
Dong Fu ◽  
Chenn Zhou ◽  
Kazuaki Yazawa ◽  
...  
Keyword(s):  
Power Plant ◽  
Numerical Model ◽  
Electrical Power ◽  
Flame Temperature ◽  
Rankine Cycle ◽  
Generation Process ◽  
Steam Turbines ◽  
Gas Temperature ◽  
Steam Temperature ◽  
Low Efficiency

Traditional fossil fuel power generation process typically has low efficiency. Large amount of the energy loss in Rankine cycle steam turbines (ST) is due to the temperature difference between the combustion flame temperature ∼2250 K (adiabatic) and the high pressure steam temperature up to 900 K. However, some of this energy can be harvested using solid-state thermoelectric (TE) power generators which are placed into the gap between the flame temperature and the steam temperature that produce additional electrical power. This study investigates the potential placement of TE on water tube wall inside a boiler at a coal fired power plant. Three dimensional (3D) numerical model of a simplified TE module is developed and hot gas temperature and steam temperature from the boiler are used as boundary conditions at the hot side and cold side of the TE. The numerical results are compared with analytical calculations. The 3D effects of the thermal spreading in the TE module are investigated. Parameters such as TE leg cross-section area and TE fill factor are examined in order to maximize the electrical power production of the TE without sacrificing the boiler efficiency (i.e., reducing the steam temperature). The study also looks into the various locations inside the boiler that have good potential for TE installation.

Numerical Investigation of Thermoelectric Topping Cycle in Coal Fired Power Plant Boiler

2016 ◽  
Author(s):  
Armin Silaen ◽  
Bin Wu ◽  
Chenn Zhou
Keyword(s):  
Power Generation ◽  
Electrical Power ◽  
Flame Temperature ◽  
Three Dimensional ◽  
Rankine Cycle ◽  
Generation Process ◽  
Steam Turbines ◽  
Steam Temperature ◽  
Low Efficiency ◽  
Topping Cycle

Traditional fossil fuel power generation process typically has low efficiency. Large amount of the energy loss in Rankine cycle steam turbines (ST) is due to the temperature difference between the combustion flame temperature ∼2250 K (adiabatic) and the high pressure steam temperature up to 900 K. This paper investigates the potential of harvesting this energy to produce additional electrical power using solid-state thermoelectric (TE) power generators placed into the gap between the flame temperature and the steam temperature. Three dimensional (3D) numerical model of a simplified TE module is developed. Different dimensions of fin added to the TE module were investigated to maximize the additional electrical power generation without sacrificing the boiler efficiency.

Modeling and Control of Excitation Systems for Synchronous Generators

2011 ◽  
Vol 148-149 ◽  
pp. 983-986
Author(s):  
Farouk Naeim ◽  
Sheng Liu ◽  
Lan Yong Zhang
Keyword(s):  
Power Generation ◽  
Power Plant ◽  
Electrical Power ◽  
Control Element ◽  
Steam Turbines ◽  
Synchronous Generators ◽  
Power Station ◽  
Modeling And Control ◽  
Generation Cost ◽  
And Control

The electrical power generation and distribution in power plant suffers from so many problems, such as instability of demand and generation. These lead to increase of generation cost. The system under consideration is consist of two steam turbines each of 30 MW with total of 60 MW (2*30). The excitation system of 30 MW generators has been chosen, due to the problems faced by operators in power station. These problems include aging of the control element, feeding back signal and loading increase/ decrease problems.

Energy, Exergy, Environmental (3E) and Parametric Assessment of a Triple-Pressure Reheat Combined-Cycle Power Plant

2021 ◽  
Vol 143 (11) ◽  
Author(s):  
Mohammadreza Babaei Jamnani ◽  
David S-K Ting ◽  
Rupp Carriveau ◽  
Amin Kardgar
Keyword(s):  
Power Plant ◽  
Heat Recovery ◽  
Flame Temperature ◽  
Combined Cycle ◽  
Steam Turbines ◽  
Combined Cycle Power Plant ◽  
Environmental Objectives ◽  
Mass Flowrate ◽  
Mass Flow Rates ◽  
Reheating Process

Abstract In this study, energy, exergy, and environmental (3E) assessments have been conducted on a proposed combined-cycle power plant (CCPP) with three pressure levels of the HRSG and reheating process. 3E design approaches cross-link mechano-electric and environmental objectives. Herewith, the suggested combined-cycle is formed by a gas unit, condenser, steam turbines, triple-pressure heat recovery steam generator (HRSG) and also utilizes reheat facilities and auxiliary components. It is observed that more than 56% of total exergy destruction occurs in the combustor, followed by HRSG (15.29%), steam turbines (roughly 15.02%), gas turbine (8.93%), air compressor (1.79%), and condenser (0.66%). A parametric study is also presented that examines the sensitivity of performance indicators to various environmental states, steam pressures, pinch points, and steam mass flow rates. Moreover, it is presented that the implementation of Siemens SGT-100-1S over other GT configurations can considerably reduce deficiency of the overall cycle. The effects of each contaminant mass flowrate (NOx, CO, UHC, and CO2) and adiabatic flame temperature (AFT) are also studied when the gas unit operates under partial power and incomplete combustion conditions. In conclusion, a number of potential causes of irreversibilities and corrective optimization guidance are offered for each main equipment of the CCPP.

Electrical Power Generation: Fossil Fuels

2017 ◽  
Author(s):  
Peter Rez
Keyword(s):  
Gas Turbine ◽  
Thermal Efficiency ◽  
Power Plants ◽  
Fossil Fuels ◽  
Turbine Blades ◽  
Electrical Power ◽  
Rankine Cycle ◽  
Combined Cycle ◽  
Brayton Cycle ◽  
Steam Temperature

Nearly all electrical power is generated by rotating a coil in a magnetic field. In most cases, the coil is turned by a steam turbine operating according to the Rankine cycle. Water is boiled and heated to make high-pressure steam, which drives the turbine. The thermal efficiency is about 30–35%, and is limited by the highest steam temperature tolerated by the turbine blades. Alternatively, a gas turbine operating according to the Brayton cycle can be used. Much higher turbine inlet temperatures are possible, and the thermal efficiency is higher, typically 40%. Combined cycle generation, in which the hot exhaust from a gas turbine drives a Rankine cycle, can achieve thermal efficiencies of almost 60%. Substitution of coal-fired by combined cycle natural gas power plants can result in significant reductions in CO2 emissions.

Advanced Last Stage Blade for Nuclear Power Plant Upgrades

2019 ◽  
Author(s):  
Christian Siewert ◽  
James R. McCracken ◽  
Thomas Thiemann
Keyword(s):  
Power Plant ◽  
Nuclear Power ◽  
Electrical Power ◽  
Measurement Data ◽  
Vibration Measurement ◽  
Operational Experience ◽  
Steam Turbines ◽  
Ambient Conditions ◽  
Operational Conditions ◽  
Last Stage

Abstract Utility steam turbines for electrical power generation are used at many places worldwide with different ambient conditions and different power plant configurations resulting in a variety of environmental and operational conditions. In some environments and operational conditions excitation mechanisms exist which may result in elevated Last Stage Blade vibrations. A particular example occurs in some steam turbine modernization projects, in which modern Last Stage Blade designs are applied in configurations with retained outer casing and diffusor designs from the original turbine design. In this paper, operational experience with an advanced Last Stage Blade coupled by damping elements is presented. In addition, the background leading to the development of this Last Stage Blade is outlined in this paper. Vibration measurement data obtained from field measurements in certain modernized units with retained outer casings from original installation is summarized and compared to the corresponding data for a freestanding Last Stage Blade previously used in these units showing the vibrational behavior of the newly developed Last Stage Blade. Results from field inspections are also presented. The data and inspections show the Last Stage Blade with damping elements do not exhibit elevated vibrations previously indicated.

scholarly journals Simulation of 25 Mwe Steam Power Plants Using Gate Cycle

2019 ◽  
Vol 8 (6) ◽  
pp. 2326-2630
Keyword(s):  
Power Plant ◽  
Thermal Efficiency ◽  
Input Data ◽  
Power Plants ◽  
Electrical Power ◽  
Steam Pressure ◽  
Steam Temperature ◽  
Steam Power ◽  
Main Input ◽  
Main Steam

Power plants using steam are a very popular system today. To develop a construction of power plant system requires an accurate analysis in determining operating parameters as expected. Designing with manual calculations certainly requires a very long time. One of faster method use a thermodynamic simulation system such as a Gate Cycle. The goal of this research was to simulate a steam power plant to produce 25 MW net electric power and to investigate the effect of an increasing of main steam temperature, main steam pressure and condenser pressure on electrical power and thermal efficiency. The simulation was done using the main input data of simulation were tempe rature of 535 0C, pressure of 89 bar, condenser pressure of 0.084 bar and heating value of low rank coal of 3800 kcal/kg. The main steam temperature was varied of 515; 535; 555 and 575 0C. The main steam pressure was varied of 79; 89; 99 and 120 bar, The condenser pressure was varied at 0.064; 0.074; 0.084 and 0.094 bar. The simulation results showed the net electric power produced of 25.8 MW on the main input data. An increasing of the main steam temperature and the main steam pressure would increase the net electrical power and the thermal efficiency but an increasing of condenser pressure would decrease the net electrical power and the thermal efficiency

Thermal Performance of Biomass-Fired Steam Power Plant

2017 ◽  
Vol 9 (3) ◽  
Author(s):  
Chaouki Ghenai ◽  
Ahmed Amine Hachicha
Keyword(s):  
Power Plant ◽  
Flue Gas ◽  
Electrical Power ◽  
Heat Rate ◽  
Plant Performance ◽  
Energy Output ◽  
Gas Temperature ◽  
Forest Residues ◽  
Steam Power ◽  
Steam Power Plant

This paper presents results on the performance of 10 MW biomass-fired steam power plant. The main objective is to test the performance of the power plant using different type of biomass fuels: bagasse, corn stover, forest residues, and urban wood residues. The biomass fuel was mixed with sub-bituminous coal with fractions of 0–100%. The effect of excess combustion air, flue gas temperature, and the parasitic loads on the power plant performance was investigated. The output results from the heat and mass balance analysis include the monthly and annual electrical power generated, capacity factor (CF), boiler efficiency (BE), thermal efficiency, and gross and net heat rate. The results show a slightly decrease (1.7%) of the annual energy production when the biomass fractions increase from 6% to 100% but a substantial decrease of the CO2 equivalent emissions. A decrease of the excess combustion air from 25% to 5% will increase the boiler and thermal efficiencies and the annual energy output by 2%. This is mainly due to the reduction of the dry flue gas losses (DFGLs) with the reduction of the excess combustion air. A reduction of the parasitic loads from 10% to 2% will increase the power plant performance by 9%. This can be achieved by using more efficient pumps, fans, and conveyors in the power plant. A reduction of the flue gas temperature from 480 °F to 360 °F increases the power plant performance by 4.4% due to the reduction of the dry flue gas losses.

The Combined Reheat Gas Turbine/Steam Turbine Cycle: Part I—A Critical Analysis of the Combined Reheat Gas Turbine/Steam Turbine Cycle

1980 ◽  
Vol 102 (1) ◽  
pp. 35-41 ◽  
Author(s):  
I. G. Rice
Keyword(s):  
Power Plant ◽  
Steam Turbine ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Critical Analysis ◽  
Pressure Ratio ◽  
Rankine Cycle ◽  
Steam Turbines ◽  
Gas Generator ◽  
World Energy

The reheat gas turbine cycle combined with the steam turbine Rankine cycle holds new promise of appreciably increasing power plant thermal efficiency. Apparently the cycle has been overlooked and thus neglected through the years. Research and development is being directed towards other gas turbine areas because of the world energy crunch; and in order to focus needed technical attention to the reheat cycle, this paper is presented, using logic and practical background of heat recovery boilers, steam turbines, gas turbines and the process industry. A critical analysis is presented establishing parameters of efficiency, cycle pressure ratio, firing temperature and output. Using the data developed, an analysis of an actual gas generator, the second generation LM5000, is applied with unique approaches to show that an overall 50 percent efficiency power plant can be developed using today’s known techniques and established base-load firing temperatures.

scholarly journals A Novel and Efficient INC Based MPPT for PV System

2021 ◽  
pp. 34-42
Author(s):  
Santosh Kumar ◽  
A. K. Wadhwani ◽  
Bharat Mishra
Keyword(s):  
Energy Source ◽  
Solar Power ◽  
Electrical Power ◽  
Generation Process ◽  
Power Demand ◽  
Generation System ◽  
Pv System ◽  
Maximum Power Tracking ◽  
New Type ◽  
Low Efficiency

This paper discuss the Incremental Conduction based MPPT for tracking the solar power. Due to increment of power demand here to find the new type of generation system. The concept of Renewable Energy Source (RES) is now become a most popular for generation of power. There are basically three types of RES is used for generation process, Wind, PV, fuel cell. Solar system is one of the best RES technique for generation of electrical power but it have some drawback. It is only used in the daytime and has low efficiency. For improving the efficiency of the system here maximum power tracking is needed. Here Incremental Conduction based MPPT for tracking the solar power is used. The whole model is simulated in MATLAB /SIMULINK for checking the performance of the system and is applicable to different type of domestic loads. The THD of the system is calculated.

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