scholarly journals Сomparative analysis and prospects of the use of multi -fuel micro-thermal power stations on the basis of the steeling engine for rural areas

2020 ◽  
Vol 22 (5) ◽  
pp. 3-17
Author(s):  
A. D. Mekhtiyev ◽  
A. D. Al'kina ◽  
V. V. Yugay ◽  
U. S. Esenzholov ◽  
N. B. Kaliaskarov
Keyword(s):  
Computer Simulation ◽  
Rural Areas ◽  
Heat Supply ◽  
Power Plants ◽  
Thermal Power ◽  
Simulation Method ◽  
External Heat ◽  
Working Fluid ◽  
Thermal Power Plants ◽  
Mathematical Methods

THE PURPOSE. Conducting a comparative analysis of the problems of efficient power supply torural consumers. Offering solution stop roblems by using multi-fuelmicrothermal power plants based on the Stirlingengine for ruralareas. Justification and description of prospects for the use of multi-fuelmicro-thermal power plants based on the Stirlingengine for ruralareas. METHODS. Methods of computer simulation of thermodynamic processes of multi fuel micro-thermal power plants based on an engine based on an engine with external heat supply are used. A computer simulation method has been developed that allows constructing a PV diagram and processes of changes in the pressure and volume of the working fluid depending on the position of the working piston and the displacer. Mathematical methods of analysis and description of the thermodynamic cycle of an engine with external heat supply are used. RESULTS. Выполнен анализ достижений и уровня современных достижений в области микро электростанций. Установлено направление развития научных исследований по разработке двигателя с внешним подводом тепла. Приведены некоторые результаты исследований по эффективности работы двигателя с внешним подводом теплоты. CONCLUSIONS . Одним из решений проблемы эффективного электроснабжения сельских потребителей может быть внедрения микро тепловых электростанций. Их использование позволит снизить стоимость электроэнергии и обеспечить ее бесперебойную поставку. Основой микро тепловой электростанции является двигатель с внешним подводом теплоты, работающий по принципу Стирлинга.

Application of Supercritical Fluids in Thermal- and Nuclear-Power Engineering

2021 ◽  
pp. 601-658
Author(s):  
Igor L. Pioro
Keyword(s):  
Heat Transfer ◽  
Carbon Dioxide ◽  
Supercritical Fluids ◽  
Nuclear Power ◽  
Power Plants ◽  
Thermal Power ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Thermal Power Plants ◽  
Power Cycles

Supercritical Fluids (SCFs) have unique thermophyscial properties and heat-transfer characteristics, which make them very attractive for use in power industry. In this chapter, specifics of thermophysical properties and heat transfer of SCFs such as water, carbon dioxide, and helium are considered and discussed. Also, particularities of heat transfer at Supercritical Pressures (SCPs) are presented, and the most accurate heat-transfer correlations are listed. Supercritical Water (SCW) is widely used as the working fluid in the SCP Rankine “steam”-turbine cycle in fossil-fuel thermal power plants. This increase in thermal efficiency is possible by application of high-temperature reactors and power cycles. Currently, six concepts of Generation-IV reactors are being developed, with coolant outlet temperatures of 500°C~1000°C. SCFs will be used as coolants (helium in GFRs and VHTRs, and SCW in SCWRs) and/or working fluids in power cycles (helium, mixture of nitrogen (80%) and helium (20%), nitrogen and carbon dioxide in Brayton gas-turbine cycles, and SCW/“steam” in Rankine cycle).

Application of Supercritical Pressures in Power Engineering

2017 ◽  
pp. 404-457
Author(s):  
Igor Pioro ◽  
Mohammed Mahdi ◽  
Roman Popov
Keyword(s):  
Heat Transfer ◽  
Carbon Dioxide ◽  
High Temperature ◽  
Gas Turbine ◽  
Power Plants ◽  
Thermal Power ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Thermal Power Plants ◽  
Power Cycles

SuperCritical Fluids (SCFs) have unique thermophyscial properties and heat-transfer characteristics, which make them very attractive for use in power industry. In this chapter, specifics of thermophysical properties and heat transfer of SCFs such as water, carbon dioxide and helium are considered and discussed. Also, particularities of heat transfer at SuperCritical Pressures (SCPs) are presented, and the most accurate heat-transfer correlations are listed. SuperCritical Water (SCW) is widely used as the working fluid in the SCP Rankine “steam”-turbine cycle in fossil-fuel thermal power plants. This increase in thermal efficiency is possible by application of high-temperature reactors and power cycles. Currently, six concepts of Generation-IV reactors are being developed, with coolant outlet temperatures of 500°C~1000°C. SCFs will be used as coolants (helium in GFRs and VHTRs; and SCW in SCWRs) and/or working fluids in power cycles (helium; mixture of nitrogen (80%) and helium [20%]; nitrogen, and carbon dioxide in Brayton gas-turbine cycles; and SCW “steam” in Rankine cycle).

The Study on Water Conservation in Thermal Power Plants

2014 ◽  
Vol 675-677 ◽  
pp. 1716-1720 ◽  
Author(s):  
Jian Lei Zhou ◽  
Yu Yun Fu
Keyword(s):  
Water Conservation ◽  
Power Plants ◽  
Thermal Power ◽  
Water System ◽  
Cooling Water ◽  
Working Fluid ◽  
Feed Water ◽  
Thermal Power Plants ◽  
Transfer Energy ◽  
Circulating Cooling Water

As the main working fluid pair to transfer energy and cool down the equipment, water is used in a large amount in thermal power plants. It will promote water conservation and resource recycling if the water use is managed effectively in production and the wastewater, which come from circulating cooling water system, the pretreatment in boiler feed water preparation system, desalination system and condensate polishing system, is disposed and recycled well.

Peak shaving and heat supply flexibility of thermal power plants

2021 ◽  
pp. 117030
Author(s):  
Congyu Wang ◽  
Jiwei Song ◽  
Lingkai Zhu ◽  
Wei Zheng ◽  
Zhaozhao Liu ◽  
...  
Keyword(s):  
Heat Supply ◽  
Power Plants ◽  
Thermal Power ◽  
Thermal Power Plants ◽  
Peak Shaving ◽  
Supply Flexibility

scholarly journals Public-private partnership as a mechanism for the development of heat supply

2020 ◽  
Vol 221 ◽  
pp. 03001
Author(s):  
Aleksey Bataev ◽  
Dmitry Samorukov ◽  
Antonina Glushkova ◽  
Vitaly Potyarkin
Keyword(s):  
Urban Areas ◽  
Heat Supply ◽  
Power Plants ◽  
Thermal Power ◽  
Public Private Partnership ◽  
Thermal Power Plants ◽  
Russian Government ◽  
Private Companies ◽  
Private Partnership ◽  
State Programs

The relevance of the research topic is caused by the need to form new innovative approaches in the field of heat supply, aimed at modernizing thermal power plants that provide heat to urban areas. In recent years, the Russian government has adopted several state programs related to environmental protection, directed towards reducing the emission of harmful substances into the atmosphere. Thermal power plants are objects whose emissions significantly pollute the environment. Considering the wear of equipment, according to various estimates, reaches 60-80% in different regions, such equipment is extremely necessary to be modernized. Using the mechanism of public-private partnership in the field of heat supply is examined in this study. An algorithm for constructing a model in the field of creating mini thermal power plants is considered. They provide heat supply to individual urban areas, as well as to ensure a significant reduction in the level of environmental pollution. The main financial indicators are estimated based on the above algorithm. This project’s performance is assessed on the basis of financing both from the state and private companies. Conclusions about using the proposed model for the development of heat supply are drawn.

scholarly journals Structural and Parametric Optimization of S-CO2 Thermal Power Plants with a Pulverized Coal-Fired Boiler Operating in Russia

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7136
Author(s):  
Andrey Rogalev ◽  
Vladimir Kindra ◽  
Ivan Komarov ◽  
Sergey Osipov ◽  
Olga Zlyvko
Keyword(s):  
Power Plants ◽  
Thermal Power ◽  
Rankine Cycle ◽  
Combustion Products ◽  
Pulverized Coal ◽  
Electricity Production ◽  
Working Fluid ◽  
Inlet Temperature ◽  
Thermal Power Plants ◽  
Increase Energy Efficiency

The Rankine cycle is widely used for electricity production. Significant weight and size characteristics of the power equipment working on superheated steam are the main disadvantages of such power plants. The transition to supercritical carbon dioxide (S-CO2) working fluid is a promising way to achieve a significant reduction in equipment metal consumption and to increase energy efficiency. This paper presents the results of thermodynamic analysis of S-CO2 thermal power plants (TPPs) utilizing the heat of combustion products of an energy boiler. It was found that the net efficiency of the developed S-CO2 TPP with a pulverized coal-fired boiler reached 49.2% at an initial temperature of 780 °C, which was 2% higher compared to the efficiency level of steam turbine power plants (STPPs) at a similar turbine inlet temperature.

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