scholarly journals Expediency of using the method of thermochemical regeneration at the reconstruction of a gas thermal power plant

2020 ◽  
Vol 2020 (3) ◽  
pp. 53-57
Author(s):  
I.V. Antonets ◽  
Keyword(s):  
Power Plant ◽  
Natural Gas ◽  
Gas Turbine ◽  
Thermal Power Plant ◽  
Thermal Power ◽  
Calorific Value ◽  
Combustion Products ◽  
Steam Superheater ◽  
Working Fluid ◽  
Gas Power Plant

The article is devoted to finding ways for the improvement of technical, economic and environmental characteristics of an existing gas thermal power plant (TPP). One of such ways is the use of thermochemical regeneration (TCR) technology. Thermochemical regeneration is the technology of utilization of the waste-gas heat, which lies in the conversion of fuel due to this heat, as a result of which a new fuel with a significantly higher calorific value is formed. In addition, this fuel contains a significant amount of hydrogen, the combustion of which is accompanied by lower NOx emissions as compared with, for example, natural gas. Thus, TCR enables one to solve simultaneously environmental problems (at least in part). When using this technology, there is a problem of finding a heat source to implement the conversion process. It is shown that the replacement of intermediate steam superheater by thermochemical reactor reduces the efficiency of power plant as a whole. Therefore, we analyze the variant of gas-turbine superstructure over the TPP. Two schemes of the realization of TCR with steam-gas power plant (SGP) are considered: a scheme with the use of air excess for decreasing the temperature of working body before the gas turbine (α > 1) and a scheme with ballast in the form of combustion products. Calculations show that the presence of oxygen in the reagent of conversion significantly reduces its degree, which makes such schemes inefficient, and the use of combustion products as ballast to reduce the temperature of working fluid before the gas turbine gives an increase in efficiency of 3.6% (rel.) as compared with conventional SGP. It is established that the introduction of scheme with ballast in the form of combustion products will save 2790 nm3 / h of natural gas. Keywords: thermal power industry, thermochemical regeneration, steam-gas power plant

Mechanical behaviour of material of thermal power plant steam superheater collector after exploitation

2013 ◽  
Vol 27 ◽  
pp. 262-271 ◽  
Author(s):  
O. Yasniy ◽  
T. Vuherer ◽  
V. Yasniy ◽  
A. Sobchak ◽  
A. Sorochak
Keyword(s):  
Power Plant ◽  
Mechanical Behaviour ◽  
Thermal Power Plant ◽  
Thermal Power ◽  
Steam Superheater

SANITARY PROTECTION ZONES BY NOISE FACTOR FROM GAS DISTRIBUTION POINTS

Akustika ◽  
2021 ◽  
pp. 133-137
Author(s):  
Vladimir Tupov ◽  
Vitaliy Skvortsov
Keyword(s):  
Power Plant ◽  
Natural Gas ◽  
Thermal Power Plant ◽  
Power Plants ◽  
Thermal Power ◽  
Design Stage ◽  
Thermal Power Plants ◽  
Gas Distribution ◽  
Surrounding Area ◽  
Protection Zone

The power equipment of thermal power plants is a source of noise to the surrounding area. One of the sources of noise for the surrounding area are gas distribution points (GDP) of thermal power plants (TPP) and district thermal power plants (RTS). Noise from gas distribution points may exceed sanitary standards at the border of the sanitary protection zone. The article shows that the radiated noise from gas distribution points depends on the power of the thermal power plant (natural gas consumption) and the type of valves. Three types of valves used in gas distribution points are considered. Formulas are obtained for calculating the width of the sanitary protection zone for gas distribution points for thermal stations, depending on the consumption of natural gas (electric power of the thermal power plant) and the type of valve. It is shown that, depending on the valve used, the noise level at the border of the sanitary protection zone can either meet sanitary standards or exceed them. This allows at the design stage to select the required type of valve or to determine mitigation measures from hydraulic fracturing.

scholarly journals THERMOACOUSTIC ENGINE AS A LOW-POWER COGENERATION ENERGY SOURCE FOR AUTONOMOUS CONSUMER POWER SUPPLY

2021 ◽  
Vol 18 (2) ◽  
pp. 60-66
Author(s):  
A.D. Mekhtiyev ◽  
Keyword(s):  
Power Plant ◽  
Low Power ◽  
Power Supply ◽  
Thermal Power Plant ◽  
Power Plants ◽  
Thermal Power ◽  
Saturated Steam ◽  
Working Fluid ◽  
Thermoacoustic Engine ◽  
Basic Principles

The article deals with the issue of using a thermoacoustic engine as a low-power cogeneration source of energy for autonomous consumer power supply capable of operating on various types of fuel and wastes subject to combustion. The analysis of the world achievements in this field of energy has been carried out. A number of advantages make it very promising for developing energy sources capable of complex production of electrical and thermal energy with a greater efficiency than that of present day thermal power plants. The proposed scheme of a thermal power plant is based on the principle of a Stirling engine, but it uses the most efficient and promising thermoacoustic converter of heat into mechanical vibrations, which are then converted into electric current. The article contains a mathematical apparatus that explains the basic principles of the developed thermoacoustic engine. To determine the main parameters of the thermoacoustic engine, the methods of computer modeling in the DeltaEC environment have been used. A layout diagram of the laboratory sample of a thermal power plant has been proposed and the description of its design has been given. It has been proposed to use dry saturated steam as the working fluid, which makes it possible to increase the generated power of the thermoacoustic engine.

Repowering: An Option for Refurbishment of Old Thermal Power Plants in Latin-American Countries

2010 ◽  
Author(s):  
Washington Orlando Irrazabal Bohorquez ◽  
Joa˜o Roberto Barbosa ◽  
Luiz Augusto Horta Nogueira ◽  
Electo E. Silva Lora
Keyword(s):  
Power Plant ◽  
Natural Gas ◽  
Steam Turbine ◽  
Gas Turbine ◽  
Power Plants ◽  
Thermal Power ◽  
Rankine Cycle ◽  
Combined Cycle ◽  
Fuel Oil ◽  
Thermal Power Plants

The operational rules for the electricity markets in Latin America are changing at the same time that the electricity power plants are being subjected to stronger environmental restrictions, fierce competition and free market rules. This is forcing the conventional power plants owners to evaluate the operation of their power plants. Those thermal power plants were built between the 1960’s and the 1990’s. They are old and inefficient, therefore generating expensive electricity and polluting the environment. This study presents the repowering of thermal power plants based on the analysis of three basic concepts: the thermal configuration of the different technological solutions, the costs of the generated electricity and the environmental impact produced by the decrease of the pollutants generated during the electricity production. The case study for the present paper is an Ecuadorian 73 MWe power output steam power plant erected at the end of the 1970’s and has been operating continuously for over 30 years. Six repowering options are studied, focusing the increase of the installed capacity and thermal efficiency on the baseline case. Numerical simulations the seven thermal power plants are evaluated as follows: A. Modified Rankine cycle (73 MWe) with superheating and regeneration, one conventional boiler burning fuel oil and one old steam turbine. B. Fully-fired combined cycle (240 MWe) with two gas turbines burning natural gas, one recuperative boiler and one old steam turbine. C. Fully-fired combined cycle (235 MWe) with one gas turbine burning natural gas, one recuperative boiler and one old steam turbine. D. Fully-fired combined cycle (242 MWe) with one gas turbine burning natural gas, one recuperative boiler and one old steam turbine. The gas turbine has water injection in the combustion chamber. E. Fully-fired combined cycle (242 MWe) with one gas turbine burning natural gas, one recuperative boiler with supplementary burners and one old steam turbine. The gas turbine has steam injection in the combustion chamber. F. Hybrid combined cycle (235 MWe) with one gas turbine burning natural gas, one recuperative boiler with supplementary burners, one old steam boiler burning natural gas and one old steam turbine. G. Hybrid combined cycle (235 MWe) with one gas turbine burning diesel fuel, one recuperative boiler with supplementary burners, one old steam boiler burning fuel oil and one old steam turbine. All the repowering models show higher efficiency when compared with the Rankine cycle [2, 5]. The thermal cycle efficiency is improved from 28% to 50%. The generated electricity costs are reduced to about 50% when the old power plant is converted to a combined cycle one. When a Rankine cycle power plant burning fuel oil is modified to combined cycle burning natural gas, the CO2 specific emissions by kWh are reduced by about 40%. It is concluded that upgrading older thermal power plants is often a cost-effective method for increasing the power output, improving efficiency and reducing emissions [2, 7].

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