Determination of the local parameters of heat- and mass transfer in deep cooling in a tube bundle of fuel combustion products of thermal power plants

2009 ◽  
Vol 82 (2) ◽  
pp. 283-290
Author(s):  
V. I. Baikov ◽  
V. A. Borodulya ◽  
V. L. Malevich ◽  
A. E. Sinkevich
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Power Plants ◽  
Tube Bundle ◽  
Thermal Power ◽  
Combustion Products ◽  
Fuel Combustion ◽  
Thermal Power Plants ◽  
Local Parameters

scholarly journals Development of water deaeration technologies with boiler exhaust gases

2021 ◽  
Vol 2039 (1) ◽  
pp. 012036
Author(s):  
M M Zamaleev ◽  
V N Kovalnogov ◽  
R I Kamalova ◽  
O V Pazushkina
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Power Plants ◽  
Thermal Power ◽  
Transfer Efficiency ◽  
Thermal Power Plants ◽  
Exhaust Gases ◽  
Mass Transfer Efficiency ◽  
The Media ◽  
Water Deaeration

Abstract The calculation of the heat and mass transfer efficiency of the proposed technology for deaeration of water by the exhaust gases of a gas-proof boiler in deaerators of serial design has been performed. The conditions and criterial values of the media consumption in the apparatus have been studied. It is shown that the technology can be successfully applied in operating thermal power plants.

scholarly journals SIMULATION OF LOW-GRADE COAL COMBUSTION IN REAL CHAMBERS OF ENERGY OBJECTS

2019 ◽  
Vol 59 (2) ◽  
pp. 98-108 ◽  
Author(s):  
Aliya Askarova ◽  
Saltanat Bolegenova ◽  
Symbat Bolegenova ◽  
Meruyert Beketayeva ◽  
Valeriy Maximov ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Power Plants ◽  
Thermal Power ◽  
3D Modelling ◽  
Low Grade ◽  
Thermal Power Plants ◽  
Combustion Chambers ◽  
Transfer Processes ◽  
Mass Transfer Processes

The aim of the work is to create new computer technologies for 3D modelling of heat and mass transfer processes in high-temperature physicochemically reacting environments that will allow to determine the aerodynamics of the flow and heat and mass transfer characteristics of technological processes occurring in the combustion chambers in existing coal-fired thermal power plants of the Republic of Kazakhstan. The novelty of the research lies in the use of the latest information technologies of 3D modelling, which will enable project participants to obtain new data on complex heat and mass transfer processes when burning pulverized coal in real combustion chambers operating in Kazakhstan’s Thermal Power Plants (TPP). A numerical simulation, including thermodynamic, kinetic and threedimensional computer simulation of heat and mass transfer processes when burning low-grade fuel, will allow finding optimal conditions for setting adequate physical, mathematical and chemical models of the technological process of combustion of burning high ash coals. The computer modelling methods proposed for the development are new and technically feasible, since coal-fired power plants all over the world use all types of coal. The developed technologies will allow replacing or eliminating the conduct of expensive and labour-consuming natural experiments on coal-fired power plants.

Laser-Induced Breakdown Spectroscopy for Quantitative and Qualitative Analysis on Ash Fusion Temperatures of Coal in Power Plant

2021 ◽  
Author(s):  
Wenhao Zhang ◽  
Zhuang Zhuo ◽  
Peng Lu ◽  
Jingqi Lu ◽  
Tengfei Sun ◽  
...  
Keyword(s):  
Power Plant ◽  
Traditional Method ◽  
Power Plants ◽  
Thermal Power ◽  
Laser Induced Breakdown Spectroscopy ◽  
Thermal Power Plants ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Long Time

The prediction of coal fusion characteristics and determination of slagging behaviour are of great significance to the operation of thermal power plants. The traditional method needs a long time to...

scholarly journals Purification of thermal power plant emissions from carbon dioxide by the liquefaction method as part of a turboexpander unit

2021 ◽  
Vol 2094 (5) ◽  
pp. 052019
Author(s):  
A V Egorov ◽  
Yu F Kaizer ◽  
A V Lysyannikov ◽  
A V Kuznetsov ◽  
Yu N Bezborodov ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Power Plants ◽  
Thermal Power ◽  
Combustion Products ◽  
Combined Cycle ◽  
Energy Costs ◽  
Thermal Power Plants ◽  
Power Plant Emissions ◽  
Turbo Expander ◽  
Plant Emissions

Abstract The purpose of this work is to estimate the energy costs for the utilization of carbon dioxide generated by thermal power plants operating on various types of fuel by the liquefaction method as part of a turbo-expander installation, as well as a general assessment of the efficiency of the TPP during the utilization of carbon dioxide. The energy costs for the liquefaction of carbon dioxide in the turbo-expander unit from the combustion products of thermal power plants running on coal, natural gas and heating oil differ slightly and amount to about 5 MJ/kg of fuel burned. The practical application of purification of combustion products of thermal power plants from carbon dioxide by the liquefaction method as part of a turboexpander installation is possible as part of combined-cycle power plants with a simultaneous reduction in electrical efficiency by more than 10 % to a level of less than 50 %.

scholarly journals Areas of using environmentally friendly fuel combustion technologies at TPPs of the Irkutsk Region

2020 ◽  
Vol 209 ◽  
pp. 05008
Author(s):  
Georgiy Lachkov
Keyword(s):  
Power Plants ◽  
Thermal Power ◽  
Electric Energy ◽  
Fuel Combustion ◽  
Thermal Power Plants ◽  
Environmental Characteristics ◽  
Advanced Technologies ◽  
Irkutsk Region ◽  
Harmful Emissions ◽  
The Future

The use of coal as the main fuel at thermal power plants in the Irkutsk Region, the significant moral and physical depreciation at many of them of the main generating equipment, mainly boiler plants, due to the long service life, determine the relevance of environmental considerations in organizing rational energy supply to regional consumers in the future. The study of the age composition, technical and environmental characteristics of the boiler equipment of thermal power plants in the region. A review of advanced technologies for burning fuel in large installations with the aim of producing thermal and electric energy. Based on an analysis of the state and environmental characteristics of thermal power plants in the Irkutsk Region, a review of advanced technologies for burning fuel in large thermal power plants, the main directions of the future use of these technologies at thermal power plants in the region are considered, taking into account their features and environmental characteristics in order to reduce harmful emissions. The list of thermal power plants recommended for conversion to natural gas burning is determined, as well as the list of thermal power plants where it is advisable to use boilers with a ring furnace or boilers with a low-temperature vortex furnace. The potential volume of reduction of harmful emissions from the introduction of advanced technologies for fuel combustion at thermal power plants of the region is estimated.

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.

scholarly journals Analysis of Two-Stage Fuel Combustion in Multi-Fuel Boilers

2021 ◽  
pp. 33-37
Author(s):  
Vadym Dyahiliev ◽  
Olexander Yefimov ◽  
Valerii Kavertsev ◽  
Tetyana Harkusha ◽  
Bogdan Chernysh
Keyword(s):  
Power Plants ◽  
Thermal Power ◽  
Combustion Products ◽  
Fuel Combustion ◽  
Fuel Oil ◽  
Toxic Substances ◽  
Two Stage ◽  
Boiler Load ◽  
Stage Combustion ◽  
Combustion Processes

The significant growth of industry in the second half of the 20th century led to a number of problems, one of the most important problems is the protection of the environment from pollution. The main source of air pollution is heat and power generating plants, which are based on combustion processes. The largest pollutant is thermal power plants, which burn a large volume of fossil fuel and form a corresponding amount of toxic substances, in particular nitrogen and sulfur oxides. In this paper, combustion processes with various burner devices will be considered and two fuels – natural gas, fuel oil. One of the most important tasks operation of power equipment is the development and widespread use of effective methods to reduce the formation of harmful substances and determining the optimal modes of fuel combustion, ensuring a minimum level of emissions of toxic combustion products. Two-stage fuel combustion is an effective method of reducing nitrogen oxide emissions. In two-stage combustion, one fuel burnout zone is replaced by several zones, as isolated as possible. The paper will compare several options for the implementation of two-stage combustion in the boiler. The influence of boiler load on the concentration of nitrogen oxides in the exhaust gases is analyzed. Also at two-stage combustion of fuel oil in gas-oil boilers reliability of screen surfaces of heating as a result of decrease in the maximum falling heat streams on a screen surface of heating of a copper increased.

scholarly journals Analytical techniques for determination and control of silica content in the water in thermal power plants

2015 ◽  
Vol 69 (6) ◽  
pp. 605-616
Author(s):  
Natasa Ignjatovic ◽  
Maja Ilic ◽  
Ljubinka Rajakovic
Keyword(s):  
Power Plants ◽  
Thermal Power ◽  
Electrochemical Techniques ◽  
Chloride Ions ◽  
Molecular Forms ◽  
Piping System ◽  
Thermal Power Plants ◽  
Ultrapure Water ◽  
Advantages And Disadvantages

Ultrapure water with minimum contents of impurities is used for the preparation of steam in thermal power plants. More recently it has been found that the corrosion process is also influenced by sodium ions, chloride ions, and all forms of silicon in water. At higher temperatures and under high pressure the less soluble compounds of silicon are extracted, which form deposits on the walls of the boiler, the piping system and the turbine blades. Silicon is found in water in the form of different types (species) which are characterized by specific physical and chemical properties. Distinctions can be made between highly reactive species of ionic (silicate anions) and molecular forms (silicic acid) and relatively inert types (suspended, colloidal, and polymerized silicon). The determination of various forms of silicon in water is a complex analytical task. This paper covers relevant research in the field of silicon specification analysis. Maintaining the unchanged, original composition of silicon species during various stages of analysis (sample collection, storage, and conservation) has been given special attention. A large number of methods and procedures have been developed for the analysis of species of silicon, including chromatographic, spectroscopic and electrochemical techniques and combinations thereof. The techniques used for determining both the total amount and individual forms of silicon have been singled out. There is also an overview of the coupled techniques used most frequently in practice by using the methodology which involves preliminary separation of species and then individual specification. The paper offers an overview of analytical properties, advantages and disadvantages of the most representative analytical methods developed specifically for the analysis of silicon species in ultrapure water. The most important studies focusing on the silicon species in water have been highlighted and presented in detail. The determination of silicon content in water is of great importance because of various effects of silicon species (corrodibility and toxicity) and the selection of methods for the efficient removal of silicon from water.

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