scholarly journals Mechanical strength of slag crushed stone generated at coal-fired thermal power plants

Vestnik MGSU ◽  
2020 ◽  
pp. 968-979
Author(s):  
Aleksandr A. Lunev
Keyword(s):  
Mechanical Strength ◽  
Coal Mining ◽  
Power Plants ◽  
Thermal Power ◽  
Deformation Modulus ◽  
Coarse Grained ◽  
Crushed Stone ◽  
Physical Parameters ◽  
Kuznetsk Coal ◽  
Factors Influencing

Introduction. Production waste is used in the construction industry worldwide as it helps to cover a considerable portion of the industry’s demand for building materials. Coarse-grained slag deposits (slag crushed stone and sand), formed in the slag washout zone, have more potential for application than other ash and slag mixtures (coarse ASM), but they need more research. Mechanical properties of the slag crushed stone (coarse-grained ASM), formed in the course of coal combustion at Kansk-Achinsk, Kuznetsk coal deposits (in boilers equipped with liquid and dry slag removal facilities) and the application of the slag crushed stone in roadbuilding are considered. Materials and methods. In the course of the research, the crushability and the deformation modulus of particular fractions of slag crushed stone samples (in dry and water-saturated conditions) taken from the dumps of Novosibirsk TPP-3 (that consumes the coal of the Kansk-Achinsk coal mining field) and from Novosibirsk TPP-2 and Seversk TPP (that consume the coal of the Kuznetsk coal mining field) were identified. To assess the factors influencing the mechanical strength of the slag crushed stone, ignition losses, the content of flaky and acicular particles, dust and clay particles and clay lumps was made. Results. The difference in the mechanical strength of samples having different genesis was identified. The graphs obtained in the course of testing were assessed and deformability characteristics were calculated (for materials having different fineness values). The factors influencing the mechanical strength of slag crushed stone were determined. Dependencies between deformation parameters and crushability of the slag crushed stone were obtained. Conclusions. Some mechanical and physical parameters of the slag crushed stone were identified; they were applied to outline potential areas of the slag crushed stone application in road building. The mathematical relationship needed to project the deformation modulus of the slag crushed stone was identified. This relationship will be used to design structures to be made of this material.

scholarly journals MECHANICAL STRENGHT’S RESEARCH OF THE THERMAL POWER STATION’S SLAG

2019 ◽  
Vol 16 (6) ◽  
pp. 746-757
Author(s):  
A. A. Lunev
Keyword(s):  
Power Plants ◽  
Thermal Power ◽  
Road Construction ◽  
Coarse Grained ◽  
Kuznetsk Coal ◽  
Coal Basin ◽  
Slag Removal ◽  
The Road ◽  
Road Pavement ◽  
The Difference

Introduction. The use of the thermal power station’s (TPS) waste in the construction industry becomes the norm in world practice of recent decades. Basically, the researches use ash and slag in the construction of automobile roads as a material for filling the subgrade or in the form of a cement-bound material in industrial and civil construction as a material for planning work, when filling inconveniences and quarries. However, the potential of the ash and slag’s usage is much wider. Coarse-grained slag deposits that form in the zone of slag erosion have a greater potential for application than other ash and slag mixtures, however, these mixtures have been less studied by both domestic and foreign researchers. The paper discusses the use of the boiler slag formed at power plants with boilers involving liquid slag removal for the construction of road pavement bases with the position of its mechanical properties.Materials and methods. The author studied samples of boiler slag from Novosibirsk TPS-2, operating (Kuznetsk coal basin) and Novosibirsk TPS-3 (Kansko-Achinsk coal basin). Moreover, the author determined the crushing losses of individual fractions of the investigated materials in a dry and water-saturated state. The author determined the modulus of deformation of boiler slag.Results. The researcher found the difference in mechanical strength of the different genesis material. The crushing values of the investigated materials are determined.The author estimated the graphs obtained during testing and calculated the deformability characteristics of the material.Discussion and conclusions. The author determines possible directions of the studied materials’ usage in the road construction.The author has read and approved the final manuscript. Financial transparency: the author has no financial interest in the presented materials or methods. There is no conflict of interest.

scholarly journals Sustainable Coal Mining and Electricity Generation: With Special Reference to Dahanu Thermal Power Station

2020 ◽  
Vol Special Issue (1) ◽  
Author(s):  
Sugat Tajane ◽  
Manika Kamthan
Keyword(s):  
Coal Mining ◽  
Thermal Power Station ◽  
Power Plants ◽  
Thermal Power ◽  
Mining Industry ◽  
Resource Exploitation ◽  
Power Station ◽  
Mining Operations ◽  
Environment And Health ◽  
Mineral Development

Mining Industry is often tagged as a polluting sector since it involves since it involves extensive resource exploitation by unsustainable methods. The techniques involved in mining cause tremendous destruction to the environment and health of people living in nearby areas. There is a growing consensus on sustainable and efficient mineral development which will avoid the clash between economic and environmental interests. Deployment of advanced and sustainable technological solutions in the entire mining process, fixing the gaps in its regulatory mechanisms and learning from the successes of specific domestic and international mining operations are certain solutions that have the capacity this sector more productive. The paper provides insights into the problems of mining sector and possible solutions to overcome these problems. It also provides examples of certain best practices adopted by mining corporations for sustainable coal mining. The paper also explores various methods and technologies which can be adopted by Thermal Power Plants to reduce their emissions and simultaneously conserve environment. An empirical study of Dahanu Thermal Power Station located in state of Maharashtra of India has been undertaken for this purpose to study the modern technologies adopted by them to lower their emission levels.

scholarly journals Recent Advances in Methods for Recovery of Cenospheres from Fly Ash and Their Emerging Applications in Ceramics, Composites, Polymers and Environmental Cleanup

Crystals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1067
Author(s):  
Virendra Kumar Yadav ◽  
Krishna Kumar Yadav ◽  
Vineet Tirth ◽  
Ashok Jangid ◽  
G. Gnanamoorthy ◽  
...  
Keyword(s):  
Fly Ash ◽  
Mechanical Strength ◽  
Power Plants ◽  
Agricultural Land ◽  
Coal Fly Ash ◽  
Thermal Power ◽  
Value Added ◽  
Thermal Power Plants ◽  
Environmental Cleanup ◽  
High Mechanical Strength

Coal fly ash (CFA) is a major global pollutant produced by thermal power plants during the generation of electricity. A significant amount of coal fly ash is dumped every year in the near vicinity of the thermal power plants, resulting in the spoilage of agricultural land. CFA has numerous value-added structural elements, such as cenospheres, plerospheres, ferrospheres, and carbon particles. Cenospheres are spherical-shaped solid-filled particles, formed during the combustion of coal in thermal power plants. They are lightweight, have high mechanical strength, and are rich in Al-Si particles. Due to cenospheres’ low weight and high mechanical strength, they are widely used as ceramic/nanoceramics material, fireproofing material, and in nanocomposites. They are also used directly, or after functionalization, as an adsorbent for environmental cleanup—especially for the removal of organic and inorganic contaminants from wastewater. By utilizing this waste material as an adsorbent, the whole process becomes economical and eco-friendly. In this review, we have highlighted the latest advances in the cenospheres recovery from fly ash and their application in ceramics and wastewater treatment.

scholarly journals “Perception of Employees on Organizational Culture of Singareni Collieries Company Limited (With Special Reference to Kothagudem Mines, Khammam District, Telangana State)”

2019 ◽  
Vol 9 (1) ◽  
pp. 1772-1775
Keyword(s):  
Organizational Culture ◽  
Coal Mining ◽  
Power Plants ◽  
Thermal Power ◽  
Organizational Capabilities ◽  
Mining Company ◽  
Share Capital ◽  
Company Limited ◽  
Telangana State ◽  
The Government

Singareni Collieries Company Limited (SCCL) is the second largest coal mining company in India after Coal India Limited (CIL) with a total man power of 56,282 during 2016-17. It is a public sector coal mining company jointly owned by Telangana State Government (51 Percent share capital) and the Government of India (49 percent share capital). The company’s accredited function is to explore and exploit coal deposits in the Godavari Valley coal field area covering the four districts of Telangana State namely Adilabad, Karimnagar, Khammam and Warangal. The company markets its coal to diverse industries such as thermal power plants, cement, steel, paper, textiles, tobacco, ceramics, pharmaceuticals, distilleries etc. With spurt in industrial growth and the resultant increase in demand for electricity, the company has been playing a key role in the growth and development of the nation. Further, the new Electricity Act providing opportunities for independent power production and distribution, the demand for coal has increased phenomenally. In short, the demand for its coal is more than what it can supply to the market. Hence the company has to take measures to increase its coal production and productivity, which in turn to a large extent depends upon positive organizational culture. In a dynamic and changing environment, culture’s flexibility, adaptiveness and responsiveness create organizational capabilities. Organizational culture plays a vital role in the survival and success of organizations. Hence, the present article focuses on the perception of employees of SCCL on the Organizational Culture that is prevailing and whether the present Organizational culture is conducive to the productive performance or not. Certain Statistical tools like Chi-Square test, ANOVA and T-test have been applied to validate the perception of employees.

scholarly journals Towards Improving Technical Performance of a 747 MW Thermal Power Plant

2021 ◽  
Vol 19 (1) ◽  
pp. 104-111
Author(s):  
Muhammad A. Raza ◽  
Krishan L. Khatri ◽  
Sunila Akbar ◽  
Muhammad I. U. Haque
Keyword(s):  
Power Plant ◽  
Thermal Power Plant ◽  
Power Plants ◽  
Thermal Power ◽  
Thermal Power Plants ◽  
Safety Engineering ◽  
Technical Performance ◽  
Factors Influencing ◽  
Technical Issues ◽  
And Performance

In this paper, performance evaluation and technical audit of a 747 MW thermal power plant consisting of three generating units is conducted. The factors influencing the performance of the plant have been identified and improvements in processes and mechanical, electrical, instrumentation, and safety engineering are suggested. These improvements would result in better profitability, productivity, and performance. The paper further discusses technical issues and challenges and identifies key areas where improvements are possible. Future recommendation for the operation of the plant that would result in better throughput are also presented. The methodology of performance analysis presented in the paper will help improving operational efficiency of thermal power plants in developing countries.

Assessment of Life Cycle Greenhouse Gas Emissions from Coal Fired Power Plants in India

2014 ◽  
Vol 704 ◽  
pp. 487-490 ◽  
Author(s):  
Arun Nagarkatti ◽  
Ajit Kumar Kolar
Keyword(s):  
Life Cycle ◽  
Power Plant ◽  
Greenhouse Gas ◽  
Coal Mining ◽  
Coal Combustion ◽  
Electricity Generation ◽  
Power Plants ◽  
Thermal Power ◽  
Ghg Emissions ◽  
Life Cycle Approach

More than two third share of electricity come from coal fired power plants in India. Coal fired power plants are the largest source of anthropogenic CO2 emissions per unit of electricity generation among all fossil fuel based power plants. There has been climate change and global warming globally due to increasing anthropogenic emission of greenhouse gas (GHG) into the atmosphere. This paper examines life cycle GHG emission such as CH4, CO2 and N2O of a National Thermal Power Corporation (NTPC) Limited power plant using life cycle approach. The various stages involved in the assessment of life cycle GHG emissions in the present study include coal mining, transportation of coal to the power plant and coal combustion for electricity generation. The results show that direct CO2 emission from coal combustion is about 890 g CO2-e/kWh, whereas life cycle GHG emissions amount to 929.1 g CO2-e/kWh. Indirect GHG emissions add up to 4.2% of total emissions. Coal mine methane leakage into atmosphere in India is low since more than 90% of the coal mining is surface mining.

scholarly journals Elevated Black Carbon Concentrations and Atmospheric Pollution around Singrauli Coal-Fired Thermal Power Plants (India) Using Ground and Satellite Data

2018 ◽  
Vol 15 (11) ◽  
pp. 2472 ◽  
Author(s):  
Ramesh Singh ◽  
Sarvan Kumar ◽  
Abhay Singh
Keyword(s):  
Black Carbon ◽  
Coal Mining ◽  
Power Plants ◽  
Thermal Power ◽  
Optical Parameters ◽  
Mining Areas ◽  
Angstrom Exponent ◽  
Ångström Exponent ◽  
High Concentrations ◽  
Ångstrom Exponent

The tropospheric NO2 concentration from OMI AURA always shows high concentrations of NO2 at a few locations in India, one of the high concentrations of NO2 hotspots is associated with the locations of seven coal-fired Thermal Power plants (TPPs) in Singrauli. Emissions from TPPs are among the major sources of black carbon (BC) soot in the atmosphere. Knowledge of BC emissions from TPPs is important in characterizing regional carbonaceous particulate emissions, understanding the fog/haze/smog formation, evaluating regional climate forcing, modeling aerosol optical parameters and concentrations of black carbon, and evaluating human health. Furthermore, elevated BC concentrations, over the Indo-Gangetic Plain (IGP) and the Himalayan foothills, have emerged as an important subject to estimate the effects of deposition and atmospheric warming of BC on the accelerated melting of snow and glaciers in the Himalaya. For the first time, this study reports BC concentrations and aerosol optical parameters near dense coal-fired power plants and open cast coal mining adjacent to the east IGP. In-situ measurements were carried out in Singrauli (located in south-east IGP) at a fixed site about 10 km from power plants and in transit measurements in close proximity to the plants, for few days in the month of January and March 2013. At the fixed site, BC concentration up to the 95 μgm−3 is observed with strong diurnal variations. BC concentration shows two maxima peaks during early morning and evening hours. High BC concentrations are observed in close proximity to the coal-fired TPPs (>200 μgm−3), compared to the outside domain of our study region. Co-located ground-based sunphotometer measurements of aerosol optical depth (AOD) show strong spatial variability at the fixed site, with AOD in the range 0.38–0.58, and the highest AOD in the range 0.7–0.95 near the TPPs in transit measurements (similar to the peak of BC concentrations). Additionally, the Angstrom exponent was found to be in the range 0.4–1.0 (maximum in the morning time) and highest in the proximity of TPPs (~1.0), suggesting abundance of fine particulates, whereas there was low Angstrom exponent over the surrounding coal mining areas. Low Angstrom exponent is characterized by dust from the unpaved roads and nearby coal mining areas. MODIS derived daily AOD shows a good match with the MICROTOPS AOD. The CALIPSO derived subtypes of the aerosol plot shows that the aerosols over Singrauli region are mainly dust, polluted dust, and elevated smoke. The preliminary study for few days provides information about the BC concentrations and aerosol optical properties from Singrauli (one of the NO2 hotspot locations in India). This preliminary study suggests that long-term continuous monitoring of BC is needed to understand the BC concentrations and aerosol optical properties for better quantification and the estimation of the emission to evaluate radiative forcing in the region.

scholarly journals Modern problems and main directions for ensuring explosion and fire safety of fuel preparation systems for combustion in thermal power plant

2019 ◽  
Vol 12 (2) ◽  
pp. 97-105
Author(s):  
V. Z. Leikin ◽  
V. Ye. Mikhailov ◽  
L. A. Chomenok ◽  
P. M. Luzin
Keyword(s):  
Fire Safety ◽  
Power Plants ◽  
Circulating Fluidized Bed ◽  
Thermal Power ◽  
Coal Industry ◽  
Kuznetsk Coal ◽  
Explosion Hazard ◽  
Thermal Power Plants ◽  
Explosion Safety ◽  
Explosion And Fire Safety

To solve the problem of further improving the efficiency and reliability of solid fuel generation in the Russian Federation, it is necessary to solve a number of main problems: ensuring environmental safety, export-oriented nature of the coal industry, low reliability, efficiency, high emissions of NOx , SO2 and particulate matter of existing obsolete equipment. In modern conditions, these problems can be solved comprehensively with the use of relatively low-cost methods in the case of using highly reactive coals, which at the same time have an increased explosion hazard (coals of explosiveness groups 3 and 4). For this reason, currently a large number of coal-fired power plants (mainly in Siberia and the Urals) experience a global transition to the combustion of highly explosive Kuznetsk coal of grades D, G, GD. In the present work, analysis is undertaken of methods and technologies to ensure the explosion and fire safety of fuel preparation systems for combustion at thermal power plants during the transition to these types of fuels, since most of these thermal power plants were initially designed for explosion-proof types of coal (T, 1CC, AH). A number of additional recommendations are developed to the current "rules of explosion safety", taking into account the specifics of technological schemes and the operation of a large number of these thermal power plants, a number of design solutions for equipment that improve the explosion safety of their dust treatment plants. For systems of preparation of finely crushed fuel (5–15 mm), boilers with circulating fluidized bed that are promising for the Russian power industry, and the use of drying installations at thermal power plants to ensure crushing of ordinary high-humidity fuels entering thermal power plants, a number of measures have been proposed that increase the fire safety of such installations.

Modeling and Simulation of Industrial Coal Fired Boiler

2015 ◽  
Vol 787 ◽  
pp. 255-259
Author(s):  
S. Vijayalakshmi ◽  
D. Manamalli ◽  
S. Ramesh Babu
Keyword(s):  
Power Plants ◽  
Model Simulation ◽  
Thermal Power ◽  
Point Of View ◽  
Physical Parameters ◽  
First Principle ◽  
Operating Range ◽  
Plant Data ◽  
System Variables ◽  
Wide Operating

This paper presents the dynamic modeling of 210MW Industrial Coal Fired Boiler which is used commonly in thermal power plants. The goal of developing the first principle model is to capture the key dynamical properties of the boiler over a wide operating range. The model describes the complicated dynamics of the various components of Industrial coal fired boiler such as furnace, boiler drum, primary superheater attemperator and secondary superheater. The model is developed based on the physical principles, and is characterized by a few physical parameters. The parameters are determined from the construction data, and a few of them from the field test data. A strong effort has been made to strike a balance between fidelity and simplicity. From the modeling point of view, the boiler is divided into five subsystems and for each subsystem, the first principle models are developed using the mass and energy balance equations. The subsystem models are then integrated to obtain the integrated boiler model. Simulation studies are carried out based on the nominal values of the system variables and the parameters collected from a power plant. The integrated boiler model obtained is tested for its dynamic and steady state characteristics and the results of which are described. The model is validated against the unique plant data and the results are presented. The model describes the behaviour of the system over a wide operating range. A good agreement is found between the simulation and actual parameters of the boiler.

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