scholarly journals Selection Ideal Coal Suppliers of Thermal Power Plants Using the Matter-Element Extension Model with Integrated Empowerment Method for Sustainability

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Zhongfu Tan ◽  
Liwei Ju ◽  
Xiaobao Yu ◽  
Huijuan Zhang ◽  
Chao Yu
Keyword(s):  
Evaluation System ◽  
Supplier Selection ◽  
Power Plants ◽  
Thermal Power ◽  
Fuel Quality ◽  
Extension Model ◽  
Development Capacity ◽  
Generation Cost ◽  
Promethee Method ◽  
The Ideal

In order to reduce thermal power generation cost and improve its market competitiveness, considering fuel quality, cost, creditworthiness, and sustainable development capacity factors, this paper established the evaluation system for coal supplier selection of thermal power and put forward the coal supplier selection strategies for thermal power based on integrated empowering and ideal matter-element extension models. On the one hand, the integrated empowering model can overcome the limitations of subjective and objective methods to determine weights, better balance subjective, and objective information. On the other hand, since the evaluation results of the traditional element extension model may fall into the same class and only get part of the order results, in order to overcome this shortcoming, the idealistic matter-element extension model is constructed. It selects the ideal positive and negative matter-elements classical field and uses the closeness degree to replace traditional maximum degree of membership criterion and calculates the positive or negative distance between the matter-element to be evaluated and the ideal matter-element; then it can get the full order results of the evaluation schemes. Simulated and compared with the TOPSIS method, Romania selection method, and PROMETHEE method, numerical example results show that the method put forward by this paper is effective and reliable.

Variability in Thermal Performance and Measured Heat Rate in Fossil-Fuelled Power Plants

1992 ◽  
Vol 206 (2) ◽  
pp. 109-123 ◽  
Author(s):  
F L Carvalho ◽  
F H D Conradie ◽  
H Kuerten ◽  
F J McDyer
Keyword(s):  
Thermal Performance ◽  
Power Plants ◽  
Performance Monitoring ◽  
Unit Commitment ◽  
Thermal Power ◽  
Heat Rate ◽  
Plant Performance ◽  
Plant Management ◽  
Fuel Quality ◽  
Stable Operating

The paper examines the variability of key parameters in the operation of ten thermal power plants in various commercial grid environments with a view to assessing the viability of ‘on-demand’ plant performance monitoring for heat rate declaration. The plants of various types are limited to coal- and oil-fired units in the capacity range of 305–690 MW generated output. The paper illustrates the influence of control system configuration on effective and flexible power plant management. The analysis of variability indicates that there is a reasonable probability of achieving adequately stable operating periods within the normal operating envelope of grid dispatch instructions when thermal performance monitoring and display can be undertaken with a high confidence level. The levels of variability in fuel quality, which were measured during nominally constant levels of fuel input and generated output, range from about +1 per cent for oil-fired plants to about ±5 per cent for coal-fired power plants. The implications of adopting on-line monitoring of unit heat rate as an input to the generation ordering and unit commitment process are potentially significant cost and energy conservation benefits for utilities having a high proportion of coal- and oil-fired generation.

Research on the Low-Carbon Development Evaluation System for the Thermal Power Plants

2013 ◽  
Vol 295-298 ◽  
pp. 730-733
Author(s):  
Dong Xiao Niu ◽  
Tong Liu ◽  
Qiong Wang ◽  
Peng Wang
Keyword(s):  
Evaluation System ◽  
Power Plants ◽  
Thermal Power ◽  
Practical Significance ◽  
Thermal Power Plants ◽  
Low Carbon ◽  
Low Carbon Development ◽  
Development Evaluation ◽  
Development Assessment ◽  
Installed Capacity

The environment problem becoming increasingly prominent in nowadays, people pay more and more attention to low-carbon. The low-carbon status of power plants has a significant impact on the low-carbon development of the whole country. And the proportion of thermal power installed capacity of total installed capacity is more than 70%. So there’s necessity and practical significance to study low-carbon development evaluation system for thermal power plants. This paper discusses the principles, indexes selection and evaluation methods for thermal power plants’ low-carbon development assessment. And its case study done shows the effectiveness of the methods.

Model-Based Data Reconciliation to Improve Accuracy and Reliability of Performance Evaluation of Thermal Power Plants

2005 ◽  
Author(s):  
Peter Hartner ◽  
Josef Petek ◽  
Peter Pechtl ◽  
Patrick Hamilton
Keyword(s):  
Performance Evaluation ◽  
Evaluation System ◽  
Power Plants ◽  
Performance Monitoring ◽  
Thermal Power ◽  
Least Square ◽  
Data Reconciliation ◽  
Sensor Calibration ◽  
Plant Optimization ◽  
On Line

Accurate on-line plant and equipment performance evaluation is becoming critical in the power generation industry as operators seek to optimize their plants, particularly in competitive power markets. The analysis accuracy of an on-line performance monitoring system is directly dependent on the quality of the input data and usually suffers because installed plant sensors are not high-precision instruments. The inherent measurement uncertainties can be overcome by using a readily available heat balance program in combination with a least square solver. This data reconciliation system will provide the performance evaluation system with data that better reflects the plant’s current operating point, thus improving the performance evaluation system’s output and allowing for better plant optimization. Additionally, the reconciliation system can identify broken, biased or highly noisy sensors. These improvements can be obtained without installing additional precision sensors or putting unreasonable efforts into sensor calibration.

Upgrade and Life Extension of 4 × 110 MW Units: A Case Study

2004 ◽  
Author(s):  
Nynar Ayodhi ◽  
Y. Radhakrishnamurthy
Keyword(s):  
Power Plants ◽  
Thermal Power ◽  
Heat Rate ◽  
Life Extension ◽  
Load Factor ◽  
Fuel Quality ◽  
Gas Temperature ◽  
Increasing Trend ◽  
Key Issues

Achieving rated capacity and economical operation of existing thermal power plants are vital issues for utilities. Plants nearing their design life are likely to show declining trend in availability as well as increasing trend in operation and maintenance costs due to ageing. Constraints in system adequacy, decreasing trend in efficiency and poor reliability are key issues to be addressed while planning life extension. 4×110 MW power plant located in southern part of India has been taken up for renovation and modernization. Pressure parts failures mainly accounted for the reduced availability of the units. The exit gas temperature in boiler was on the higher side leading to operation of the units with reduced efficiency. Change in fuel quality over the years as compared to what has been considered during design was a constraint in achieving rated capacity. The poor heat rate of turbine necessitated incorporation of the state-of-art design to achieve better heat rate. Improvements required in control and instrumentation system were also addressed in the renovation and modernization. Improvements in plant load factor, availability and unit heat rate could be achieved in the two units where renovation and modernization has been completed. The details of the renovation and modernization of these units are discussed in this paper.

scholarly journals Minimize electricity generation cost for large scale wind- thermal systems considering prohibited operating zone and power reserve constraints

2021 ◽  
Vol 11 (3) ◽  
pp. 1905
Author(s):  
Phan Nguyen Vinh ◽  
Bach Hoang Dinh ◽  
Van-Duc Phan ◽  
Hung Duc Nguyen ◽  
Thang Trung Nguyen
Keyword(s):  
Wind Power ◽  
Electricity Generation ◽  
Power Plants ◽  
Large Scale ◽  
Search Algorithm ◽  
Thermal Power ◽  
Cuckoo Search ◽  
Cuckoo Search Algorithm ◽  
Working Zone ◽  
Generation Cost

Wind power plants (WPs) play a very important role in the power systems because thermal power plants (TPs) suffers from shortcomings of expensive cost and limited fossil fuels. As compared to other renewable energies, WPs are more effective because it can produce electricity all a day from the morning to the evening. Consequently, this paper integrates the optimal power generation of TPs and WPs to absolutely exploit the energy from WPs and reduce the total electricity generation cost of TPs. The target can be reached by employing a proposed method, called one evaluation-based cuckoo search algorithm (OEB-CSA), which is developed from cuckoo search algorithm (CSA). In addition, conventional particle swarm optimization (PSO) is also implemented for comparison. Two test systems with thirty TPs considering prohibited working zone and power reserve constraints are employed. The first system has one wind power plant (WP) while the second one has two WPs. The result comparisons indicate that OEB-CSA can be the best method for the combined systems with WPs and TPs.

scholarly journals Heat transfer for the boiling crisis in porous systems

2022 ◽  
Vol 1216 (1) ◽  
pp. 012012
Author(s):  
A A Genbach ◽  
H I Beloev ◽  
D Yu Bondartsev ◽  
N A Genbach
Keyword(s):  
Heat Exchange ◽  
Power Plants ◽  
Flow System ◽  
Thermal Power ◽  
Point Of View ◽  
Porous Structures ◽  
Combustion Chambers ◽  
Exchange Processes ◽  
Mesh Structures ◽  
The Ideal

Abstract In this paper we analized and investigated the heat exchange crisis of boiling in porous structures, applicable in thermal power plants. Then we describe the heat exchange processes mechanism and determined the ideal sizes and thicknesses of porous structures. The designed porous structures can be implemented in gas turbine’s nozzles and combustion chambers. From an environmental point of view, the consumption coolant liquid is reduced by ten times in comparison the standard flow system. It’s effectively to develop mesh structures to allow the extension of the critical loads and manage the surface border.

Analysis of the demand of Ukrainian thermal power plants for steam coal with regard for requirements to fuel quality

2016 ◽  
Vol 2016 (3) ◽  
pp. 40-49 ◽  
Author(s):  
M.O. Perov ◽  
◽  
V.M. Makarov ◽  
I.Yu. Novitsky ◽  
◽  
...  
Keyword(s):  
Power Plants ◽  
Thermal Power ◽  
Fuel Quality ◽  
Thermal Power Plants

scholarly journals Pilot-Scale Experiences on a Plasma Ignition System for Pulverized Fuels

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4726
Author(s):  
Reyhane Youssefi ◽  
Jörg Maier ◽  
Günter Scheffknecht
Keyword(s):  
Particle Size ◽  
Moisture Content ◽  
Power Plants ◽  
Thermal Power ◽  
Cold Start ◽  
Pilot Scale ◽  
Fuel Quality ◽  
Ignition System ◽  
Plasma Ignition ◽  
Start Up

The need for flexible power generation is growing worldwide as the energy transition is altering the operational regimes of thermal power plants. Plasma ignition systems, as an alternative technology to the conventional start-up method with natural gas or oil firing, offer a cost- and energy-efficient start-up process in pulverized fuel power stations. The application of plasma ignition systems for cold start-ups using different qualities of pre-dried lignite is investigated in a pilot-scale combustion facility. A plasma integrated swirl burner is developed and validated using highly ignitable lignite dust. Eight pre-dried lignite qualities with a moisture content of up to 30% and a broad particle size distribution are investigated for this application to determine the applicability and limitations of the plasma ignition system with regard to the fuel quality. The performance of lignites for cold start-up in the plasma ignition system are categorized based on their ignition and combustion performance. All lignite qualities were ignited under the cold-start-up condition with a plasma power of 4 kW to 7 kW. Lignite qualities with a moisture content of up to 20% and a median particle size of below 450 μm form a self-sustained flame with short-time plasma-supported combustion, while flame blow-out is observed for lignites with lower qualities.

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