Special Issue "Environmental Friendly Technologies in Power Engineering"

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Energy Science and Technology".

Deadline for manuscript submissions: 10 December 2021.

Special Issue Editor

Dr. Dmitrii O. Glushkov
E-Mail Website1 Website2
Guest Editor
Research School of High-Energy Physics, National Research Tomsk Polytechnic University, 634050 Tomsk, Russia
Interests: fuels; combustion chemistry; waste to energy; thermal power engineering; environmental performance
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

There are currently two main priorities in Power Engineering: 1) Developing and introducing new technologies involving renewable energy sources; 2) Modernizing widely used power generation technologies by enhancing the efficiency of industrial equipment and optimizing its operation conditions. Despite recent advancements in the development of alternative energy technologies, fossil fuels still dominate in the production of heat and electricity by steam boilers, steam and gas turbines, etc. in industrial-scale volumes. Thus, Power Engineering represents an extensive field for the elaboration and implementation of solutions aimed at improving the technological, environmental, and economic performance of technological cycles. In recent years, environmental and energy security issues have become especially important. Therefore, it is vital nowadays that we take care of nature. In the coming decades, scientific teams in different countries will face a challenge of developing sustainable and safe technologies for using fuels in the energy sector.

In this special issue, we will try to provide readers with the results of applied and fundamental research and reviews in the field of environmentally friendly technologies in Power Engineering for the reduction of anthropogenic emissions. We are pleased to invite researchers to contribute to the creation of a special issue dedicated to various aspects of sustainable use of fossil fuels, biomass, waste-derived fuels, and alternative energy sources.

Dr. Dmitrii O. Glushkov

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Thermal power engineering
  • Steam boilers
  • Steam turbines
  • Gas turbines
  • Green technologies
  • Operating mode optimization
  • Thermal power plant modernization
  • Fossil fuels
  • Waste-derived fuels
  • Coal-water slurry
  • Properties of fossil fuels, combustible wastes and biomass
  • New technologies of fuel combustion
  • Gas emissions
  • Reduction of green-house gases
  • Numerical simulation

Published Papers (8 papers)

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Research

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Article
Dynamic Analysis of the Rod-Fastened Rotor Considering the Characteristics of Circumferential Tie Rods
Appl. Sci. 2021, 11(9), 3829; https://doi.org/10.3390/app11093829 - 23 Apr 2021
Viewed by 393
Abstract
The research on the dynamic performance of the rod-fastened rotor (RFR) has always been a hotspot. However, the structural complexity of RFR has brought significant challenges to the dynamic study of the RFR. The tie rods provide preload for the rotor shaft segment, [...] Read more.
The research on the dynamic performance of the rod-fastened rotor (RFR) has always been a hotspot. However, the structural complexity of RFR has brought significant challenges to the dynamic study of the RFR. The tie rods provide preload for the rotor shaft segment, while the coordinate deformation of the tie rods will occur during the process of vibration. In addition, the tie rods and the rotor shaft segments are structurally connected in parallel. These factors all will influence the dynamic performance of the RFR. In this paper, for a RFR system, the vibration equation of the RFR considering all factors of the tie rods is deduced in detail. The influence of various factors on the dynamic performance of the rotor is investigated. Results show that the preload directly affects the dynamic performance of the RFR system. When the preload is small, the tie rod has a larger influence on the natural frequencies of the rotor. However, when the preload force reaches a certain value, the influence of the tie rod on the natural frequencies of the rotor is almost negligible. The research results provide a theoretical reference for the understanding of and further research on RFR. Full article
(This article belongs to the Special Issue Environmental Friendly Technologies in Power Engineering)
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Article
Additives to Coal-Based Fuel Pellets for the Intensification of Combustion and Reduction in Anthropogenic Gas Emissions
Appl. Sci. 2020, 10(19), 6689; https://doi.org/10.3390/app10196689 - 24 Sep 2020
Cited by 1 | Viewed by 675
Abstract
Cylinder-shaped fuel pellets that were 3 mm in diameter and 3 mm in height, with a mass of 20 mg, were produced by compressing dry coal processing waste under the pressure of 5 MPa. The first group of pellets from coal dust with [...] Read more.
Cylinder-shaped fuel pellets that were 3 mm in diameter and 3 mm in height, with a mass of 20 mg, were produced by compressing dry coal processing waste under the pressure of 5 MPa. The first group of pellets from coal dust with a particle size less than 140 µm did not contain any additives. The pellets of the second group of fuel compositions contained an oil-impregnated porous polymer material particle with a size of 0.5 mm in the central part of the experimental sample. The particle was surrounded by coal dust from all sides. The ratio of components was 90:10% for coal dust: polymer particle. The latter value almost completely corresponds to the fraction of oil in the fuel composition, since the mass of a porous polymer material particle is negligible. The third group of compositions was a 70:30% mixture of coal dust with wood sawdust with a particle size less than 45 µm, or 45–100, 100–200 and 200–500 µm. The ignition and combustion of single fuel pellets were studied under radiant heating in an air medium while varying the temperature from 800 to 1000 °C. The processes during the fuel combustion were recorded by a high-speed video camera, and the concentrations of the main anthropogenic emissions in flue gases were measured by a gas analyzer. The main characteristics were established—ignition delay times (2–8 s) and duration of burnout (40–90 s)—at different heating temperatures. A difference was established in the combustion mechanisms of the pellets, when adding various components to the fuel mixture composition. This has a direct influence on the induction period duration and combustion time, other conditions being equal, as well as on the concentration of nitrogen and sulfur oxides in the flue gases. Adding an oil-impregnated porous polymer particle to the fuel composition intensifies ignition and combustion, since the times of ignition delay and complete burnout of fuel pellets under threshold conditions decrease by 70%, whereas adding wood sawdust reduces the content of nitrogen and sulfur oxides in the flue gases by 30% and 25%, respectively. Full article
(This article belongs to the Special Issue Environmental Friendly Technologies in Power Engineering)
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Article
Impact of Different Photovoltaic Models on the Design of a Combined Solar Array and Pumped Hydro Storage System
Appl. Sci. 2020, 10(10), 3650; https://doi.org/10.3390/app10103650 - 25 May 2020
Cited by 7 | Viewed by 1859
Abstract
The impact of different photovoltaic models for a combined solar array and pumped hydro storage system was investigated. Al-Wehda dam located in Harta city in the northern of Jordan was used to validate the approach. The two-diode (TD), single-diode (SD), and ideal single-diode [...] Read more.
The impact of different photovoltaic models for a combined solar array and pumped hydro storage system was investigated. Al-Wehda dam located in Harta city in the northern of Jordan was used to validate the approach. The two-diode (TD), single-diode (SD), and ideal single-diode (ISD) solar models were evaluated in terms of the solar array size, reliability, and ecological effects. The impoundment of Al-Wehda dam was taken as the upper reservoir of the pumped hydro facility of the proposed renewable energy system. It was found that the PV power is more accurately modelled by considering the recombination loss in the TD solar model. This leads to a more realistic sizing and precise system evaluation. Results were obtained using the particle swarm optimization (PSO) algorithm and the whale optimization algorithm (WOA) for validation purposes. For instance, the PSO results showed that the realistic TD model is reliable, with an index of reliability of 98.558%. Further, it is the most ecological solution with an annual emissions reduction of 21.5198 Gg. The optimized values are 44,840 solar panels and 65.052 M.m3 of the lower reservoir volume for the TD model. The number of PV panels are reduced by 16.67% and 7.93%, respectively, with the ISD and SD relative to the TD model. Full article
(This article belongs to the Special Issue Environmental Friendly Technologies in Power Engineering)
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Article
Study on a Correlation-Based Anti-Islanding Method under Wider Frequency Trip Settings for Distributed Generation
Appl. Sci. 2020, 10(10), 3626; https://doi.org/10.3390/app10103626 - 24 May 2020
Viewed by 601
Abstract
Islanding phenomenon of distributed generation (DG), such as photovoltaic (PV) generation, is undesirable because it causes safety issues for utility service personnel and power system equipment. Many anti-islanding methods have been studied since DG appeared in electric power systems (EPSs). Most anti-islanding methods [...] Read more.
Islanding phenomenon of distributed generation (DG), such as photovoltaic (PV) generation, is undesirable because it causes safety issues for utility service personnel and power system equipment. Many anti-islanding methods have been studied since DG appeared in electric power systems (EPSs). Most anti-islanding methods focus on disconnecting DG from the grid using functionality to detect islanding under narrow frequency trip settings, because safety issues have a higher priority. However, as DG plays a key part of an EPS, a significant loss of DG due to a short disturbance could result in a reliability issue for the EPS. Corresponding to this matter, new international standards, such as IEEE standard 1547–2018, require more sophisticated and complex functionalities for grid-connected DGs by adopting ride-through technologies and wider voltage/frequency trip settings. Since most anti-islanding functions of inverter-based DG have been based on the frequency of the inverter voltage, it is more difficult to detect islanding under wider frequency trip settings. This paper presents a correlation-based anti-islanding method (AIM) without depending on the frequency trip of inverter-based DGs. Simulation results are provided to verify the performance of the correlation-based anti-islanding method. As a result, the proposed method detects islanding at 0.116 s under wider frequency trip setting by the IEEE Std. 1547–2018 test condition, while the popular active frequency drift method with positive feedback does not detect islanding using the same current disturbance. Full article
(This article belongs to the Special Issue Environmental Friendly Technologies in Power Engineering)
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Article
Allothermal Gasification of Peat and Lignite by a Focused Light Flow
Appl. Sci. 2020, 10(8), 2640; https://doi.org/10.3390/app10082640 - 11 Apr 2020
Cited by 3 | Viewed by 660
Abstract
Gasification of peat and lignite under a focused light flow was observed in a wide range of fuel moisture (up to 65 wt.%). The initial water content in the fuels under study had a different influence on the chemical composition of the synthesis [...] Read more.
Gasification of peat and lignite under a focused light flow was observed in a wide range of fuel moisture (up to 65 wt.%). The initial water content in the fuels under study had a different influence on the chemical composition of the synthesis gas (syngas). At the same time, the effect of light intensity was more predictable: in general, the production of gases grew with it. It was shown that the gasification of peat accelerated greatly when light intensity exceeded 100 W/cm2. Moreover, the conversion of peat and lignite required an order of magnitude lower intensity of the light flow than was necessary for the conversion of bituminous coal processing waste. The dynamics of the sample weight changes demonstrated that contrary to bituminous coals, the process was not purely allothermal for both peat and lignite. However, the fuel smoldering was not self-sustainable and stopped shortly after the pumping light was turned off. Full article
(This article belongs to the Special Issue Environmental Friendly Technologies in Power Engineering)
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Article
Multi-Criteria Efficiency Analysis of Using Waste-Based Fuel Mixtures in the Power Industries of China, Japan, and Russia
Appl. Sci. 2020, 10(7), 2460; https://doi.org/10.3390/app10072460 - 03 Apr 2020
Cited by 3 | Viewed by 608
Abstract
This paper presents the results of analyzing the efficiency of the following five fuel types: dry coal, wet coal processing waste, coal–water slurry, and two waste-derived slurries. In the calculations, we employed 16 criteria related to the energy industry, economy, social aspects, safety [...] Read more.
This paper presents the results of analyzing the efficiency of the following five fuel types: dry coal, wet coal processing waste, coal–water slurry, and two waste-derived slurries. In the calculations, we employed 16 criteria related to the energy industry, economy, social aspects, safety at plants, and environmental protection. We used the experimental data, obtained from the combustion of the fuels under study at three heating temperatures (700 °C, 800 °C, and 900 °C). Three countries were analyzed, where all of them have a high share of using fossil fuels in the energy industry: Japan, China, and Russia. The total performance indicator was calculated using three multiple-criteria decision analysis techniques (weighted sum method, weighted product method, and analytic hierarchy process). The choice of weight coefficients was confirmed for each method. We found that coal and coal–water slurry had the lowest integral efficiency indicators (0.016–0.535 and 0.045–0.566, respectively). The maximum effect was achieved when using waste-derived slurry with used turbine oil (0.190–0.800) and coal processing waste (0.535–0.907). There were, on average, 3%–60% differences in the integral efficiency indicator for the same fuel in different countries. The difference in the efficiency indicator of the same fuel in different countries was on average 3%–60%; with changes in temperature, the difference in efficiency was 5%–20%; and when changing the calculation procedure, the difference was 10%–90%. Full article
(This article belongs to the Special Issue Environmental Friendly Technologies in Power Engineering)
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Article
Relative Environmental, Economic, and Energy Performance Indicators of Fuel Compositions with Biomass
Appl. Sci. 2020, 10(6), 2092; https://doi.org/10.3390/app10062092 - 19 Mar 2020
Cited by 6 | Viewed by 760
Abstract
The present study deals with the experimental research findings for the characteristics of ignition (ignition delay times, minimum ignition temperature) and combustion (maximum combustion temperature, concentration of anthropogenic emission), as well as theoretical calculations of integral environmental, economic, and energy performance indicators of [...] Read more.
The present study deals with the experimental research findings for the characteristics of ignition (ignition delay times, minimum ignition temperature) and combustion (maximum combustion temperature, concentration of anthropogenic emission), as well as theoretical calculations of integral environmental, economic, and energy performance indicators of fuel compositions based on coal processing waste with the most typical types of biomass (sawdust, leaves, straw, oil-containing waste, and rapeseed oil). Based on the results of the experiments, involving the co-combustion of biomass (10% mass) with coal processing waste (90% mass) as part of slurry fuels, we establish differences in the concentrations of NOx and SOx in the gaseous combustion products. They make up from 36 to 218 ppm when analyzing the flue gases of coal and fuel slurries. Additionally, the values of relative environmental, economic, and energy performance indicators were calculated for a group of biomass-containing fuel compositions. The calculation results for equal weight coefficients are presented. It was shown that the efficiency of slurry fuels with biomass is 10%–24% better than that of coal and 2%–8% better than that of filter-cake without additives. Much lower anthropogenic emissions (NOx by 25%–62% and SOx by 61%–88%) are confirmed when solid fossil fuels are partly or completely replaced with slurry fuels. Full article
(This article belongs to the Special Issue Environmental Friendly Technologies in Power Engineering)
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Review

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Review
Green Gas for Grid as an Eco-Friendly Alternative Insulation Gas to SF6: A Review
Appl. Sci. 2020, 10(7), 2526; https://doi.org/10.3390/app10072526 - 07 Apr 2020
Cited by 4 | Viewed by 1286
Abstract
This paper deals with a review of the state-of-the-art performance investigations of green gas for grid (g3) gas, which is an emerging eco-friendly alternative insulation gas for sulfur hexafluoride (SF6) that will be used in gas-insulated power facilities for reducing environmental [...] Read more.
This paper deals with a review of the state-of-the-art performance investigations of green gas for grid (g3) gas, which is an emerging eco-friendly alternative insulation gas for sulfur hexafluoride (SF6) that will be used in gas-insulated power facilities for reducing environmental concerns. The required physical and chemical properties of insulation gas for high-voltage applications are discussed, including dielectric strength, arc-quenching capability, heat dissipation, boiling point, vapor pressure, compatibility, and environmental and safety requirements. Current studies and results on AC, DC, and lightning impulse breakdown voltage, as well as the partial discharge of g3 gas, are provided, which indicate an equivalent dielectric strength of g3 gas with SF6 after a proper design change or an increase in gas pressure. The switching bus-transfer current test, temperature rise test, and liquefaction temperature calculation also verify the possibility of replacing SF6 with g3 gas. In addition, the use of g3 gas significantly reduces theabovementioned environmental concerns in terms of global warming potential and atmosphere lifetime. In recent years, g3 gas-insulated power facilities, including switchgear, transmission line, circuit breaker, and transformer, have been commercially available in the electric power industry. Full article
(This article belongs to the Special Issue Environmental Friendly Technologies in Power Engineering)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Fire Behaviors and Properties of Power Compartment in An Underground Urban Utility Tunnel-A Review

Gang Wang 1, Xuebin Wang 1, Cheng Zhong 1, Guocheng Sun 2, Jianfeng Lu 2, Jianxin Zhou 2, Jingrong Zheng 2, Yunlong Wang 2, Fei You 3,*, Zhenhua Wang 3, Peng Zhang 2, Yuan Yu 3

1 State Grid Hebei Electric Power Supply Co., Ltd., Shijiazhuang 050022, China;
2 State Grid NARI-TECH Nanjing Control Systems Co., Ltd., Nanjing 211106, China;
3 College of Safety Science and Engineering & Institute of Fire Science and Engineering, Nanjing Tech University, Nanjing 211800, China;

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