scholarly journals Russian stationary vibration control and mechanical displacement systems for electric power pumps of thermal power plants

2019 ◽  
Vol 537 ◽  
pp. 052035
Author(s):  
Ya A Tynchenko ◽  
P M Gofman ◽  
I V Kovalev ◽  
A A Voroshilova
Keyword(s):  
Vibration Control ◽  
Electric Power ◽  
Power Plants ◽  
Thermal Power ◽  
Thermal Power Plants ◽  
Mechanical Displacement ◽  
Stationary Vibration

scholarly journals Selection of Heat Pump Capacity Used at Thermal Power Plants under Electricity Market Operating Conditions

Energies ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 226
Author(s):  
Milana Treshcheva ◽  
Irina Anikina ◽  
Vitaly Sergeev ◽  
Sergey Skulkin ◽  
Dmitry Treshchev
Keyword(s):  
Electric Power ◽  
Heat Pump ◽  
Heat Load ◽  
Power Plants ◽  
Thermal Power ◽  
Heat Pumps ◽  
Operating Conditions ◽  
Energy Resources ◽  
Thermal Power Plants ◽  
Maximum Heat

The percentage of heat pumps used in thermal power plants (TPPs) in the fuel and energy balance is extremely low in in most countries. One of the reasons for this is the lack of a systematic approach to selecting and justifying the circuit solutions and equipment capacity. This article aims to develop a new method of calculating the maximum capacity of heat pumps. The method proposed in the article has elements of marginal analysis. It takes into account the limitation of heat pump capacity by break-even operation at electric power market (compensation of fuel expenses, connected with electric power production). In this case, the heat pump’s maximum allowable capacity depends on the electric capacity of TPP, electricity consumption for own needs, specific consumption of conditional fuel for electricity production, a ratio of prices for energy resources, and a conversion factor of heat pump. For TPP based on combined cycle gas turbine (CCGT) CCGT-450 with prices at the Russian energy resources markets at the level of 2019, when operating with the maximum heat load, the allowable heat pump capacity will be about 50 MW, and when operating with the minimum heat load—about 200 MW.

Research and Development of Viscous Fluid Dampers for Improvement of Seismic Resistance of Thermal Power Plants: Part 6 — Influence of Damper Properties on Vibration Control Performance

2018 ◽  
Author(s):  
Keisuke Minagawa ◽  
Kiyoshi Aida ◽  
Go Tanaka ◽  
Satoshi Fujita
Keyword(s):  
Viscous Fluid ◽  
Vibration Control ◽  
Power Plants ◽  
Vibration Suppression ◽  
Thermal Power ◽  
Sensitivity Analyses ◽  
Thermal Power Plants ◽  
Control Performance ◽  
Support Structures ◽  
Long Duration

Coal-fired thermal power generation became a very important power source in Japan after Great East Japan Earthquake [1]. Therefore improvement of seismic reliability of the coal-fired thermal power plants is required, because occurrence of very large earthquakes is expected in Japan. Boilers of coal-fired power plants are usually suspended from the upper end of support structures in order to allow thermal expansion of the boilers [2], so boilers easily sway during earthquakes. In order to suppress the vibration, stoppers made of steel are generally installed between boilers and their support structures. Although stoppers made of steel are effective for vibration suppression, further countermeasure for earthquakes having long duration and many aftershocks is required. Authors have developed a vibration control damper for coal-fired power plants. The damper is set instead of conventional stopper. Construction of the damper is similar to oil dampers, but inner fluid is viscous fluid. In PVP2017, the basic performance of the proposed damper was presented [3–5]. In this paper, damper properties were adjusted in order to improve vibration control performance of the damper. Influence of damper properties on the performance was investigated by sensitivity analyses. In addition, influence of dispersion of damper properties was also investigated. Long period and long duration earthquake waves were considered in the analyses.

Will thermal power plants with CCS play a role in Brazil's future electric power generation?

2014 ◽  
Vol 24 ◽  
pp. 115-123 ◽  
Author(s):  
Larissa Pinheiro Pupo Nogueira ◽  
André Frossard Pereira de Lucena ◽  
Régis Rathmann ◽  
Pedro Rua Rodriguez Rochedo ◽  
Alexandre Szklo ◽  
...  
Keyword(s):  
Power Generation ◽  
Electric Power ◽  
Power Plants ◽  
Thermal Power ◽  
Thermal Power Plants ◽  
Electric Power Generation

Trial Operation Results of the Fully-Fired Combined Cycle Generating Plants in Chita

1995 ◽  
Author(s):  
T. Mita ◽  
N. Ando ◽  
A. Kawauchi ◽  
K. Morikawa
Keyword(s):  
Power Plant ◽  
Electric Power ◽  
Gas Turbine ◽  
Power Plants ◽  
Thermal Power ◽  
Good Condition ◽  
Combined Cycle ◽  
Thermal Power Plants ◽  
Total Plant ◽  
Operation Results

A fully-fired combined cycle power plant (FFCCPP) combines a steam thermal power plant with a gas turbine. Hot exhaust gases fed from the gas turbine are used as combustion air for the boiler, thus increasing total plant output and efficiency. An unusually hot spell in Japan in the summer of 1990 brought about such a rapid surge in power demand for air conditioning so that all electric power companies registered record highs in consumption. This promoted Chubu Electric Power Co. to decide to add a 154-MW gas turbine to each of its six existing steam thermal power plants (four 700-MW and two 375-MW units), thus repowering their system into an FFCCPP. Construction work began in 1992. In September, 1994, two 700-MW steam thermal power plants (Chita Thermal Power Plant’s No. 6 unit and Chita Second Thermal Power Plant’s No. 1 unit) were modified into FFCCPPs, which then began operating in a trouble-free manner. This paper reports the characteristics and test-run results of the above two plants, which have been operating in good condition as the largest-capacity FFCCPPs in the world.

Improvement of Seismic Resistance Performance of Thermal Power Plants by Applying Vibration Control Dampers

2017 ◽  
Author(s):  
Koki Fushimi ◽  
Satoshi Fujita ◽  
Keisuke Minagawa
Keyword(s):  
Vibration Control ◽  
Power Plants ◽  
Thermal Power ◽  
Analytical Models ◽  
Earthquake Resistance ◽  
Response Analysis ◽  
Thermal Power Plants ◽  
Support Structure ◽  
Large Numbers ◽  
Resistance Performance

Improving earthquake resistance of power plants has been important since Great East Japan earthquake occurred in 2011. In particular, thermal power plants accounted for most of the current Japanese power supply. Thus, improving earthquake resistance of the thermal power plants has been paid attention than other power plants. In current coal-fired power plants, boilers are simply suspended from the top of the support structures. Therefore, boilers easily vibrate. In order to suppress vibration of boilers during earthquakes, stoppers made of steel are installed between a boiler and its support structure. The stoppers dissipate vibration energy by plastic deformation. Therefore, the stoppers are effective in earthquakes with relatively small numbers of repeat counts, but may not effect in earthquakes with relatively large numbers of repeat counts. Then we propose installation vibration control dampers in support structure to suppress more the vibration and perform also in the repetition of earthquakes. In this paper, a seismic response analysis using analytical models of the boiler structure is conducted. In addition, a vibration control damper suitable for installed in the support structure are considered. As a result, a rectangle hysteresis damper is suitable as vibration control damper for the support structure.

scholarly journals Internal Benchmarking of Thermal Power Plants оf Electric Power Systems

2020 ◽  
Vol 63 (6) ◽  
pp. 541-553
Author(s):  
E. M. Farhadzadeh ◽  
A. Z. Muradaliyev ◽  
Y. Z. Farzaliyev ◽  
U. K. Ashurova
Keyword(s):  
Power Systems ◽  
Electric Power ◽  
Coefficient Of Variation ◽  
Power Plants ◽  
Thermal Power ◽  
Electric Power Systems ◽  
Arithmetic Mean ◽  
Time Interval ◽  
Thermal Power Plants ◽  
Integral Indicator

Improving the operational efficiency (OE) of thermal power plants is one of the most important problems of electric power systems (EPS). According to modern concepts, efficiency is the simultaneous consideration of three properties of objects, viz. economy, reliability and safety. The methodology of their joint assessment assumes that the service life of the main equipment does not exceed the standard value, but this condition is now met by less than half of the production enterprises of a lot of EPS. In order to increase OE, it is necessary, first of all, to learn how to objectively compare the performance of objects both of the same type – in a given time interval, and unique ones – in adjacent intervals. Existing methods for calculating integrated performance indicators do not fully take into account the random nature of technical and economic indicators (TEI). The article presents a new method for comparing the OE of EPS objects, the essence of which is to switch from joint consideration of TEI to analysis of their relative changes in comparison with the factory default value (nominal value). Relative values of indicators characterize the amount of wear or residual life. In this case, for example, the arithmetic mean of the relative values of the TEI determines the average wear of the object. This physical representation enlivens integral indicators, and their comparison and ranking ceases to be science-intensive. It is proposed to take into account also the degree of variation of relative deviations (wear), which is adequate to the object’s misalignment. It manifests itself in a significant change (deterioration) of one or (less often) two relative values of the TEI in the calculated time interval (month) and is characterized by such statistical indicators as the geometric mean and the coefficient of variation of relative deviations. Herewith, if the arithmetic mean value of the object’s wear is restored during major repairs, then the misalignment is eliminated much faster – during current repairs. A necessary condition for the feasibility of using these or those integral indicators is their functional and statistical independence. The results of the studies performed using the simulation method made it possible to establish that the smallest correlation occurs between the integral indicator calculated as the arithmetic mean of random variables and the integral indicator calculated as the coefficient of variation of the same random variables. Comparison of correlation fields clearly confirms these conclusions.

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