Thermodynamic Analysis and Comparison on Oxy-Fuel Power Generation Process

2008 ◽  
Author(s):  
Shimin Deng ◽  
Rory Hynes
Keyword(s):  
Power Generation ◽  
Power Plant ◽  
Thermodynamic Analysis ◽  
System Integration ◽  
Ambient Pressure ◽  
Plant Performance ◽  
Generation Process ◽  
Coal Properties ◽  
Performance Results ◽  
Plant Efficiency

In this paper, pressurized oxy-fuel combustion power generation processes are modeled and analyzed based on a 350 MW subcritical reheat boiler associated with a condensing steam turbine. The performance results are obtained. Furthermore, the influences of slurry concentration and coal properties on power plant performance are investigated. An oxy-fuel configuration operating at ambient pressure is studied to compare the performance with pressurized oxy-fuel configuration. Thermodynamic analysis reveals the true potentials of the pressurized oxy-fuel process. Based on the system integration, an improved configuration is proposed in which plant efficiency of pressurized oxy-fuel process is increased by 1.36%.

Thermodynamic Analysis and Comparison on Oxy-Fuel Power Generation Process

2009 ◽  
Vol 131 (5) ◽  
Author(s):  
Shimin Deng ◽  
Rory Hynes
Keyword(s):  
Power Generation ◽  
Power Plant ◽  
Thermodynamic Analysis ◽  
System Integration ◽  
Ambient Pressure ◽  
Plant Performance ◽  
Generation Process ◽  
Coal Properties ◽  
Performance Results ◽  
Plant Efficiency

In this paper, pressurized oxy-fuel combustion power generation processes are modeled and analyzed based on a 350 MW subcritical reheat boiler associated with a condensing steam turbine. The performance results are obtained. Furthermore, the influences of slurry concentration and coal properties on power plant performance are investigated. An oxy-fuel configuration operating at ambient pressure is studied to compare the performance with pressurized oxy-fuel configuration. Thermodynamic analysis reveals the true potentials of the pressurized oxy-fuel process. Based on the system integration, an improved configuration is proposed in which plant efficiency of pressurized oxy-fuel process is increased by 1.36%.

scholarly journals Pressure gain combustion advantage in land-based electric power generation

2017 ◽  
Vol 1 ◽  
pp. K4MD26 ◽  
Author(s):  
Seyfettin C. Gülen
Keyword(s):  
Power Generation ◽  
Power Plant ◽  
Gas Turbines ◽  
Combined Cycle ◽  
Cycle Performance ◽  
Heavy Duty ◽  
Quantum Leap ◽  
Pressure Gain Combustion ◽  
Industrial Gas Turbines ◽  
Plant Efficiency

AbstractThis article evaluates the improvement in gas turbine combined cycle power plant efficiency and output via pressure gain combustion (PGC). Ideal and real cycle calculations are provided for a rigorous assessment of PGC variants (e.g., detonation and deflagration) in a realistic power plant framework with advanced heavy-duty industrial gas turbines. It is shown that PGC is the single-most potent knob available to the designers for a quantum leap in combined cycle performance.

Risk Analysis and Safety Evaluation on Combustion System of Gas-Steam Combined Cycle Power Plant

2014 ◽  
Vol 533 ◽  
pp. 354-359 ◽  
Author(s):  
Zhong Qiang Sun
Keyword(s):  
Power Generation ◽  
Power Plant ◽  
Risk Analysis ◽  
Combined Cycle ◽  
Generation Process ◽  
Combustion System ◽  
Toxicity Index ◽  
Combined Cycle Power Plant ◽  
Product Gas ◽  
Gas Poisoning

Under the general policy of the national energy-saving emission reduction and sustainable development, the domestic iron and steel enterprises surge in the by-product gas power generation project. There exist many dangerous and harmful factors in by-product steel gas power generation process and which easily caused casualties and the pollution of the environment. The study on risk analysis and evaluation are still relatively dearth about the by-product gas generating process of domestic steel enterprises. The boiler system on a Combined Cycle Power Plant was analyzed and evaluation by ICI/MOND fire and explosion toxicity index method and the method of fault tree analysis, which combined with the actual situation of steel plant Combined Cycle Power Plant. The results show that the combustion system is more dangerous, and the hazard index levels are reduced to lower level after safety compensatory measures except the unit toxicity index higher. The shielding device or gas alarm failure was the main cause of gas poisoning. According to the analysis some feasible measures was put forward. The study has positive guiding significance for risk management and safety administration decision of the Combined Cycle Power Plant.

scholarly journals Methodology for implementing power plant efficiency standards for power generation: potential emission reduction

2017 ◽  
Vol 20 (2) ◽  
pp. 309-327 ◽  
Author(s):  
T. M. I. Mahlia ◽  
J. Y. Lim ◽  
Lisa Aditya ◽  
T. M. I. Riayatsyah ◽  
A. E. Pg Abas ◽  
...  
Keyword(s):  
Power Generation ◽  
Power Plant ◽  
Emission Reduction ◽  
Plant Efficiency ◽  
Power Plant Efficiency

CO2 Capture for Power Plants: An Analysis of the Energetic Requirements by Chemical Absorption

2006 ◽  
Author(s):  
Ana R. Diaz
Keyword(s):  
Power Generation ◽  
Power Plant ◽  
Co2 Capture ◽  
Power Plants ◽  
Fossil Fuel ◽  
Plant Performance ◽  
Energy Requirements ◽  
Co2 Absorption ◽  
Chemical Absorption ◽  
Technical Effort

The tendency in the world energy demand seems clear: it can only grow. The energetic industry will satisfy this demand-despite all its dialectic about new technologies-at least medium term mostly with current fossil fuel technologies. In this picture from an engineer’s point of view, one of the primary criterions for mitigating the effects of increasing atmospheric concentration of CO2 is to restrict the CO2 fossil fuel emissions into the atmosphere. This paper is focused on the analysis of different CO2 capture technologies for power plants. Indeed, one of the most important goal to concentrate on is the CO2 capture energy requirements, as it dictates the net size of the power plant and, hence, the net cost of power generation with CO2 avoidance technologies. Here, the Author presents a critical review of different CO2 absorption capture technologies. These technologies have been widely analyzed in the literature under chemical and economic points of view, leaving their impact on the energy power plant performance in a second plan. Thus, the central question examined in this paper is the connection between abatement capability and its energetic requirements, which seriously decrease power generation efficiency. Evidencing that the CO2 capture needs additional technical effort and establishing that further developments in this area must be constrained by reducing its energy requirements. After a comprehensive literature revision, six different chemical absorption methods are analyzed based on a simplified energetic model, in order to account for its energetic costs. Furthermore, an application case study is provided where the different CO2 capture systems studied are coupled to a natural gas cogeneration power plant.

An Expanded Cost of Electricity Model for Highly Flexible Power Plants

2012 ◽  
Vol 135 (1) ◽  
Author(s):  
S. Can Gülen ◽  
Indrajit Mazumder
Keyword(s):  
Power Generation ◽  
Power Plant ◽  
Gas Turbine ◽  
Power Plants ◽  
Combined Cycle ◽  
Plant Performance ◽  
Cost Of Electricity ◽  
Renewable Power ◽  
Effective Performance ◽  
The Impact

Cost of electricity (COE) is the most widely used metric to quantify the cost-performance trade-off involved in comparative analysis of competing electric power generation technologies. Unfortunately, the currently accepted formulation of COE is only applicable to comparisons of power plant options with the same annual electric generation (kilowatt-hours) and the same technology as defined by reliability, availability, and operability. Such a formulation does not introduce a big error into the COE analysis when the objective is simply to compare two or more base-loaded power plants of the same technology (e.g., natural gas fired gas turbine simple or combined cycle, coal fired conventional boiler steam turbine, etc.) and the same (or nearly the same) capacity. However, comparing even the same technology class power plants, especially highly flexible advanced gas turbine combined cycle units with cyclic duties, comprising a high number of daily starts and stops in addition to emissions-compliant low-load operation to accommodate the intermittent and uncertain load regimes of renewable power generation (mainly wind and solar) requires a significant overhaul of the basic COE formula. This paper develops an expanded COE formulation by incorporating crucial power plant operability and maintainability characteristics such as reliability, unrecoverable degradation, and maintenance factors as well as emissions into the mix. The core impact of duty cycle on the plant performance is handled via effective output and efficiency utilizing basic performance correction curves. The impact of plant start and load ramps on the effective performance parameters is included. Differences in reliability and total annual energy generation are handled via energy and capacity replacement terms. The resulting expanded formula, while rigorous in development and content, is still simple enough for most feasibility study type of applications. Sample calculations clearly reveal that inclusion (or omission) of one or more of these factors in the COE evaluation, however, can dramatically swing the answer from one extreme to the other in some cases.

Thermodynamic Analysis of a Solar-Coal Hybrid Poly-Generation Process for Methanol Synthesis and Power Generation

2018 ◽  
Author(s):  
Tuantuan Xin ◽  
Cheng Xu ◽  
Gang Xu ◽  
Wenyi Liu ◽  
Yongping Yang
Keyword(s):  
Power Generation ◽  
Solar Energy ◽  
Thermodynamic Analysis ◽  
Methanol Synthesis ◽  
Coal Gasification ◽  
Generation Process ◽  
Peak Period ◽  
Methanol Production ◽  
Concentrated Solar Energy ◽  
Power Load

To advance the utilization of the solar energy and coal resources as well as improve the flexibility of coal-based power plant, an improved solar-coal hybrid system for methanol production and power generation is proposed and thermodynamically analyzed. In the proposed system, the concentrated solar energy at high-temperature is used for heating the coal gasification to produce syngas for methanol synthesis; the waste material and heat from coal-to-methanol process are efficiently recovered in the conjunct power generation system; and the surplus electric power is optionally used for methanol synthesis by electrolysis process during the off-peak period. Through employing the proposed system, the solar energy and electricity (optional) could be effectively converted into methanol as stable chemical energy together with a preferable overall system thermal efficiency. The thermodynamic analysis results showed that, the overall energy and exergy efficiencies reaches 48.6 and 47.3%, respectively; the equivalent solar-to-methanol conversion efficiency can soar to 66.2%; and the net electricity-to-methanol efficiency reaches 61.6% with the power load reducing from 48.7% to 31.0%.

Thermodynamic Analysis of Sintering Waste Heat Power Generation

2011 ◽  
Vol 71-78 ◽  
pp. 2562-2565
Author(s):  
Tao Du ◽  
Jian Bo Yang ◽  
Hong Lin Zhang
Keyword(s):  
Heat Transfer ◽  
Power Generation ◽  
Thermodynamic Analysis ◽  
Heat Generation ◽  
Waste Heat ◽  
Generation Process ◽  
Regenerative Heat ◽  
Waste Heat Utilization ◽  
Cooling Air ◽  
The Heat Balance

The current domestic conditions of sintering waste heat generation are introduced. The waste heat utilization methods are given according to waste heat characteristics of 360m2 sintering machine. The particle regenerative heat exchanger model is used to calculate heat transfer area of the first part of the circular-cooler. The logarithmic mean temperature difference method is used to calculate the heat transfer of closed cycle cooling air and the temperature of exhaust gas. The thermodynamic analysis of sintering heat generation process is completed. The power generation efficiency and quantity are calculated by using the heat balance and exergy analysis method.

Steady State and Transient Modeling of a PEM Fuel Cell Power Plant for Transportation Applications

2005 ◽  
Author(s):  
Parthasarathy Seshadri ◽  
Zakiul Kabir
Keyword(s):  
Fuel Cells ◽  
Steady State ◽  
Fuel Cell ◽  
Power Plant ◽  
Low Power ◽  
Acoustic Noise ◽  
Ambient Pressure ◽  
Performance Testing ◽  
Plant Performance ◽  
Stoichiometric Ratio

UTC Fuel Cells recently developed a freeze capable fuel cell power plant for automotive applications. Steady state and dynamic system models were developed for design and performance characterization. The results of the power plant performance testing indicate very good agreement with these models. Testing showed that the power plant achieves stable performance at all power levels including low power holds. UTC Fuel Cells’ cell stack technology enables operation of the power plant at near-ambient pressure. Additionally the low system pressure drop allows the power plant to achieve very high electrical efficiencies at all power levels. The peak efficiency is about 58% at approximately 20% of rated power. Since the power plant does not require compressors, the auxiliary power requirement and acoustic noise level for the system are also low. The cell stack’s capability of internal water management and ability to operate at low reactant stoichiometric ratio result in a very stable and predictable transient capability to ramp up from low power to rated power in < 2 sec and also to step down from rated power to low power levels instantaneously in a stable manner.

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