Investigation of the properties of reed switches in devices for resource-saving relay protection of the electrical part of power plants

2021 ◽  
Author(s):  
Alexandr V. Neftissov ◽  
Oxana A. Andreyeva ◽  
Assiya Zh. Sarinova
Keyword(s):  
Power Plants ◽  
Relay Protection ◽  
Resource Saving ◽  
Electrical Part

scholarly journals Matrix method to solve inverse problem of heat transfer in heat exchangers with phase transition in heat carriers

Vestnik IGEU ◽  
2021 ◽  
pp. 68-75
Author(s):  
A.E. Barochkin
Keyword(s):  
Heat Transfer ◽  
Phase Transition ◽  
Inverse Problem ◽  
Heat Exchangers ◽  
Power Plants ◽  
Thermal Power ◽  
Energy Performance ◽  
Steam Boiler ◽  
Resource Saving ◽  
Heat Carriers

The transition to environmentally friendly and resource-saving energy, efficient use of natural resources and energy performance are the key priorities of the state energy policy of the Russian Federation. Maximum use of heat combustion of fuel and simultaneously production of condensate water of the combustion products of natural gas is one of the directions of energy saving policy. Despite many scientific papers on the issues of utilization of flue gas heat, condensation heat exchangers are not used in most gas boiler houses, energy power providers and thermal power plants in this country. And there are several reasons to explain this fact due to the lack of universal methods to calculate and design condensation-type heat exchangers. Thus, the development of new methods to simulate multithreaded heat exchangers considering the phase transition in heat carriers is an urgent task of power engineering and industry sectors. Matrix models of heat transfer based on mass and energy balance equations are applied to solve the inverse problem of heat transfer in heat exchangers, considering the phase transition in heat carriers. A method to calculate and select the designs of multi-threaded heat exchangers, considering the phase transition in heat carriers, has been developed. The author suggests a numerical solution to choose the design of a contact economizer of a heat power plant steam boiler used for heat recovery of flue gases to illustrate the effectiveness of the proposed method. The proposed method to solve the inverse problem of heat transfer provides the possibility to identify simultaneously the most acceptable values of the parameters of heat carriers and design characteristics of heat exchangers for various purposes.

scholarly journals Technological Solutions for Recycling Ash Slag from the Cao Ngan Coal Power Plant in Vietnam

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 2018 ◽  
Author(s):  
Thriveni Thenepalli ◽  
Nguyen Ngoc ◽  
Lai Tuan ◽  
Trinh Son ◽  
Ho Hieu ◽  
...  
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
Local Community ◽  
Carbon Mineralization ◽  
Coal Ash ◽  
Value Added ◽  
Economic Benefits ◽  
Current Status ◽  
Treatment Technology ◽  
Resource Saving

Annually, coal-fired power plants in Vietnam discharge hundreds of thousand tons of coal ash. Most of this ash goes into the environment without treatment or any plan for the efficient reuse of this precious resource. There are many reasons for this, such as poor quality of the ash, no suitable and feasible ash treatment technology, a lack of awareness about environmental pollution and resource saving, and inappropriate sanctions and policies. This study analyzed and summarized information and data pertaining to the current status of the production, discharge, and utilization of coal ash from the Cao Ngan Power Plant (CNPP) in Thai Nguyen Province, Vietnam. In addition, the potential for applying advanced emission reduction technologies in order to recycle coal ash for cement production, as well as geographical, socio-economic, and market factors were assessed. This paper reveals the results of a preliminary assessment of carbon-mineralization technologies which seek to achieve the following three goals: (1) effectively disposing of coal ash to protect the environment and local community, (2) contributing to the nationally determined effort to mitigate greenhouse gas emissions which cause climate change, and (3) making value-added products and bringing economic benefits to a sustainable society.

Development of Advanced USC Technologies for 700°C Class High Temperature Steam Turbines

2012 ◽  
Author(s):  
Y. Tanaka ◽  
R. Magoshi ◽  
S. Nishimoto ◽  
M. Setoyama ◽  
R. Yamamoto ◽  
...  
Keyword(s):  
High Temperature ◽  
Co2 Emissions ◽  
Power Plants ◽  
Combined Cycle ◽  
Steam Turbines ◽  
Resource Saving ◽  
Technology Program ◽  
Design Structure ◽  
Internal Efficiency ◽  
High Temperature Steam

Global warming due to increased CO2 levels in the atmosphere and resource saving have been the focus of world attention in the past decades. Efforts to improve generating efficiency by increasing the turbine inlet steam temperature and pressure in large capacity fossil-fuel and combined-cycle power plants are being made together with efforts to improve the internal efficiency. Most of MHI’s modern steam turbines, including the combined cycle plants, have a 600°C class USC inlet steam conditions. 700°C class Advanced USC (A-USC) technology is one of the remarkable technologies being developed to reduce CO2 emissions, and one, which was chosen by Japan’s ‘Cool Earth - Innovative Energy Technology Program’, which was launched in 2008 to contribute to substantial reductions in CO2 emissions. Major Japanese manufacturers of boilers and turbines joined forces with research institutes to bring the project to reality. This paper illustrates the features and benefits of A-USC technologies for MHI’s 700°C class high temperature steam turbines, including cycle design, conceptual design (structure and alloy), and the development of candidate materials.

scholarly journals Adaptive current protection in electrical complexes with small power plants

2021 ◽  
Vol 266 ◽  
pp. 04002
Author(s):  
A.I. Smirnov ◽  
J.E. Shklyarskiy
Keyword(s):  
Power Generation ◽  
Current Distribution ◽  
Power Plants ◽  
Short Circuit ◽  
Distribution Network ◽  
Relay Protection ◽  
Control Unit ◽  
Short Circuit Current ◽  
Multiple Sources ◽  
Distributed Power Generation

The article considers electrical complexes with power plants of small capacity. The influence of power generation sources on short-circuit current distribution has been investigated. Reduced sensitivity of back-up current protection and dependence of current distribution on power plant capacity are revealed. Recommendations for minimizing false operation of short-circuit protection in networks with distributed power generation are proposed. An algorithm for adaptive current protection, which uses graph theory to determine the stages of selectivity of relay protection based on finding the shortest Dijkstra path and calculation of equivalent resistance in networks with multiple sources of power generation, which provides selec-tivity and sensitivity of current protection when changing the generated power of generators and the structure of the distribution network is pre-sented. The algorithm uses communication lines with a central control unit to monitor the distribution network and update the current triggering of the relay protection in accordance with changes in the structure of the power grid. The proposed system is designed so that it can respond to dynamic changes in the structure of the network and the state of operation of power plants. Simulation modeling in the Matlab/Simulink software package was performed and the results of the algorithm are presented.

scholarly journals Is South Korea’s Emission Trading Scheme Effective? An Analysis Based on the Marginal Abatement Cost of Coal-Fueled Power Plants

2019 ◽  
Vol 11 (9) ◽  
pp. 2504 ◽  
Author(s):  
Choi ◽  
Qi
Keyword(s):  
Power Plants ◽  
Stochastic Frontier Analysis ◽  
Carbon Tax ◽  
Supply And Demand ◽  
Market Price ◽  
Emission Trading ◽  
Green Economy ◽  
Resource Saving ◽  
Frontier Analysis ◽  
Trading Scheme

This paper examines not only the effectiveness of the South Korean emissions-trading scheme (ETS), but also the determinants of its performance. We apply a directional distance function and stochastic frontier analysis method to estimate environmental efficiency and the marginal CO2 abatement costs for 50 coal-fueled power plants from 2008 to 2016. The result indicates that the efficiency differs between the Lee Myung-bak and Park Geun-hye administration periods, with performance in the former period being relatively more effective than in the latter. Meanwhile, there were price gaps of 57.98% and 72.76% in 2015 and 2016, respectively, between the realized carbon market price and our result, indicating significant suppressed pressure on the market. We conclude that the Korean government should strengthen its regulations to more effectively implement a green economy. Policymakers could impose a carbon tax; substantially decrease the carbon emissions-free quota; and provide more incentives, especially to the energy-intensive, resource-saving coal-fueled power plants. This would ultimately keep market prices within a reasonable range and achieve a balance between the supply and demand for carbon emission allowances in the market.

The resource-efficient device for protecting the electrical part of power plants

2020 ◽  
Author(s):  
Alexandr V. Neftissov ◽  
Alexandr P. Kislov ◽  
Oxana A. Andreyeva
Keyword(s):  
Power Plants ◽  
Electrical Part
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