scholarly journals Qualitative analysis of coal combusted in boilers of the thermal power plants in Bosnia and Herzegovina

2012 ◽  
Vol 16 (2) ◽  
pp. 605-612
Author(s):  
Slavko Djuric ◽  
Petko Stanojevic ◽  
Dragan Djuranovic ◽  
Sasa Brankov ◽  
Srdjan Milasinovic
Keyword(s):  
Qualitative Analysis ◽  
Bosnia And Herzegovina ◽  
Power Plants ◽  
Thermal Power ◽  
Mean Value ◽  
Thermal Power Plants ◽  
Heating Value ◽  
Lower Heating Value ◽  
The Mean ◽  
Lower Heating

In this paper we have looked into the qualitative analysis of coals in Bosnia and Herzegovina (B-H). The analysis includes the following characteristics: moisture (W), ash (A), combustible matter (Vg) and lower heating value (Hd). From the statistic parameters we have determined: absolute range (R), arithmetic mean (X), standard deviation (S) and variations coefficient (Cv). It has been shown that the coal characteristics (W, A, Vg, Hd) have normal distribution. The analysis show that there are considerable deviations of ash characteristics: moisture (36.23%), ash (34.21%), combustible matter (16.15%) and lower heating value (25.16%) from the mean value which is shown by the variations coefficient (Cv). Large oscilations of mass portions: W, A, Vg and Hd around the mean value can adversely influence the function of a boiler plant and an electric filter plant in thermal power plants in B-H in which the mentioned types of coal burn. Large ash oscilations (34.21%) around the mean value point out to the inability of application of dry procedures of desulphurisation of smoke gasses (FGD) due to the additional quantity of ash. It has been shown that the characteristics of Bosnian types of coal do not deviate a lot from the characteristics of coal in the surrounding countries (coals of Serbia and Monte Negro). The results can be used in analysis of coal combustion in thermal power plants, optimisation of electrical-filtre, reduction of SO2 in smoke gas and other practical problems.

scholarly journals Assessment of Renewable Alternatives to Coal, Based on Their High Heating Value and Global Warming Potential

2021 ◽  
pp. 19-23
Author(s):  
V. Dhivakhar ◽  
Maju Varghese ◽  
Keerthi M. S. ◽  
S. Kaviya
Keyword(s):  
Global Warming ◽  
Global Warming Potential ◽  
Power Plants ◽  
Thermal Power ◽  
Thermal Power Plants ◽  
Major Contributor ◽  
Heating Value ◽  
High Heating Value ◽  
Green House Gas ◽  
High Heating

About 40% of the Global Electricity produced is fuelled by coal. Although Coal has various advantages like good High Heating Value, easy availability etc., it also has various disadvantages. Green House Gas Released from Coal Thermal Power Plants is the single major contributor to Global warming. Coal is also nonrenewable. Hence it is important to analyze the viability of potential alternatives and reduce the usage of coal. In this assessment, various potential replacements of coal have been analyzed based on their High heating value (HHV) and their Global Warming Potential. The Global warming Potential (GWP) of the assessed fuels have been calculated by the Respiratory Quotient (RQ) Factor method. Hence a direct comparison between Coal and other replacements based on their HHV and GWP has been performed.

scholarly journals An Ultrasonic-Capacitive System for Online Characterization of Fuel Oils in Thermal Power Plants

Sensors ◽  
2021 ◽  
Vol 21 (23) ◽  
pp. 7979
Author(s):  
Mateus Mendes Campos ◽  
Luiz Eduardo Borges-da-Silva ◽  
Daniel de Almeida Arantes ◽  
Carlos Eduardo Teixeira ◽  
Erik Leandro Bonaldi ◽  
...  
Keyword(s):  
Flow Rate ◽  
Total Mass ◽  
Power Plants ◽  
Thermal Power ◽  
Electric Energy ◽  
Thermal Power Plants ◽  
Heating Value ◽  
Fuel Oils

This paper presents a ultrasonic-capacitive system for online analysis of the quality of fuel oils (FO), which are widely used to produce electric energy in Thermal Power Plants (TPP) due to their elevated heating value. The heating value, in turn, is linked to the quality of the fuel (i.e., the density and the amount of contaminants, such as water). Therefore, the analysis of the quality is of great importance for TPPs, either in order to avoid a decrease in generated power or in order to avoid damage to the TPP equipment. The proposed system is composed of two main strategies: a capacitive system (in order to estimate the water content in the fuel) and an ultrasonic system (in order to estimate the density). The conjunction of the two strategies is used in order to estimate the heating value of the fuel, online, as it passes through the pipeline and is an important tool for the TPP in order to detect counterfeit fuel. In addition, the ultrasonic system allows the estimation of the flow rate through the pipeline, hence estimating the amount of oil transferred and obtaining the total mass transferred as a feature of the system. Experimental results are provided for both sensors installed in a TPP in Brazil.

scholarly journals Ash From Thermal Power Plants as Secondary Raw Material

2007 ◽  
Vol 58 (2) ◽  
pp. 233-238 ◽  
Author(s):  
Vladica Čudić ◽  
Dragica Kisić ◽  
Dragoslava Stojiljković ◽  
Aleksandar Jovović
Keyword(s):  
Power Plants ◽  
Negative Impact ◽  
Thermal Power ◽  
Raw Material ◽  
Low Grade ◽  
Thermal Power Plants ◽  
Heating Value ◽  
Prevention Programmes ◽  
Secondary Raw Material ◽  
The Republic

Ash From Thermal Power Plants as Secondary Raw MaterialThe basic characteristic of thermal power plants in the Republic of Serbia is that they use low-grade brown coal (lignite) as a fuel. Depending on the location of coal mines, lignite may have different properties such as heating value, moisture, and mineral content, resulting in different residue upon combustion. Because of several million tonnes of ash and slag generated every year, their granularmetric particle size distribution, and transport and disposal methods, these plants have a negative impact on the environment. According to the waste classification system in the Republic of Serbia, ash and slag from thermal power plants are classified as hazardous waste, but with an option of usability. The proposed revision of waste legislation in Serbia brings a number of simple and modern solutions. A procedure is introduced which allows for end-of-waste criteria to be set, clarifying the point where waste ceases to be waste, and thereby introducing regulatory relief for recycled products or materials that represent low risk for the environment. The new proposal refocuses waste legislation on the environmental impacts of the generation and management of waste, taking into account the life cycle of resources, and develops new waste prevention programmes. Stakeholders, as well as the general public, should have the opportunity to participate in the drawing up of the programmes, and should have access to them.

Lower Heating Value Estimation of Coal Gangue through Proximate Analysis Data Based on GB/T 212-2008

2013 ◽  
Vol 726-731 ◽  
pp. 2699-2703
Author(s):  
Xiu Teng Wang ◽  
Bin Lu ◽  
Ling Xu ◽  
Chen Yi Li ◽  
Ling Lin ◽  
...  
Keyword(s):  
Thermal Power ◽  
Calorific Value ◽  
Analysis Data ◽  
Proximate Analysis ◽  
Coal Gangue ◽  
Important Indicator ◽  
Heating Value ◽  
Lower Heating Value ◽  
Value Estimation ◽  
Lower Heating

The calorific value of coal gangue is an important indicator to assess its quality for comprehensive utilizations. Although the heating values can be measured experimentally with a Bomb calorimeter, an easier and faster approach within an acceptable tolerance is in great demand. Herein, we use an alternative approach to estimate the heating value based on proximate analysis data, which are measured under the instruction of GB/T 212-2008. The lower heating values of coal gangue samples we collected range from 2307 to 8309 kJ/kg, which are key information for the use of coal gangue in principle. We conclude that the sample with calorific value of 8309 kJ/kg can be used as formal fossil fuel; another sample of 5799 kJ/kg can be used for thermal power generation, while the other four are not worth for fuel.

scholarly journals Characteristic Analysis of Torrefied Pellets: Determining Optimal Torrefaction Conditions for Agri-Byproduct

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 423 ◽  
Author(s):  
Sunyong Park ◽  
Seok Jun Kim ◽  
Kwang Cheol Oh ◽  
La Hoon Cho ◽  
Min Jun Kim ◽  
...  
Keyword(s):  
Power Plants ◽  
Energy Yield ◽  
Practical Application ◽  
Wood Pellets ◽  
Characteristic Analysis ◽  
Heating Value ◽  
Lower Heating Value ◽  
Biomass Power Plants ◽  
Lower Heating ◽  
Proximate Analyses

This study considers the possibility of utilizing agri-byproducts as energy sources via pelletization and torrefaction. Pellets were placed in a capsule and torrefied in an electrical furnace. Subsequently, they were cooled for 30 min, and their mass loss was measured. To investigate the resulting changes in fuel characteristics, ultimate and proximate analyses were performed, and calorific values were measured. To estimate the water absorption of the pellets, hygroscopicity evaluations were conducted. Based on the experimental results, the energy yield, lower heating value, and exergy were calculated to determine the optimum conditions for torrefaction. The calculation was performed by utilizing the useful exergy and standards applied to biomass power plants. We determined that torrefaction for agro-pellets should be conducted under low-to-intermediate temperatures (210–250 °C) within a period of 50 min. Under these conditions, 7–55% mass reductions were observed, the higher heating value increased from 4110 to 6880 kcal kg−1, and the lower heating value changed from 3780 to 6520 kcal kg−1 owing to reduced hygroscopicity. So, Agro-byproducts can contribute to the practical application by improving the heating value through torrefaction as an alternative to wood pellets.

scholarly journals A study on the grindability of Serbian coals

2011 ◽  
Vol 15 (1) ◽  
pp. 267-274 ◽  
Author(s):  
Dejan Radic ◽  
Marko Obradovic ◽  
Miroslav Stanojevic ◽  
Aleksandar Jovovic ◽  
Dragoslava Stojiljkovic
Keyword(s):  
Power Plants ◽  
Thermal Power ◽  
Open Pit ◽  
Electricity Production ◽  
Mineral Matter ◽  
Thermal Power Plants ◽  
Lower Heating Value ◽  
Production Increase ◽  
The Republic ◽  
Hardgrove Grindability Index

Thermal power plants in the Republic of Serbia are making considerable efforts and even more considerable investments, not only to maintain electricity production at maximum design levels, but even to additionally increase the power output of existing generating units. Capacities of mills used in pulverized coal preparation are identified as one of the main constraints to achieving maximum mill plant capacity, while coal grindability is seen as one of the factors that directly affect capacities of the coal mills utilized in thermal power plants. The paper presents results of experimental investigation conducted for the purpose of determining Hardgrove grindability index of coal. The investigation was conducted in accordance with ISO 5074 and included analysis of approximately 70 coal samples taken from the open pit mine of Kolubara coal basin. Research results obtained indicate that coal rich in mineral matter and thus, of lower heating value is characterized by higher grindability index. Therefore, analyses presented in the paper suggest that characteristics of solid fuels analyzed in the research investigation conducted are such that the use coals less rich in mineral matter i. e. coals characterized by lower grindability index will cause coal mills to operate at reduced capacity. This fact should be taken into account when considering a potential for electricity production increase.

scholarly journals Mercury Pollution In Snow Cover Around Thermal Power Plants In Cities (Omsk, Kemerovo, Tomsk Regions, Russia)

2019 ◽  
Vol 12 (4) ◽  
pp. 132-147 ◽  
Author(s):  
Anna V. Talovskaya ◽  
Egor G. Yazikov ◽  
Nina A. Osipova ◽  
Elena E. Lyapina ◽  
Victoria V. Litay ◽  
...  
Keyword(s):  
Snow Cover ◽  
Power Plants ◽  
Thermal Power ◽  
Enrichment Factors ◽  
Atmospheric Mercury ◽  
Thermal Power Plants ◽  
Particulate Phase ◽  
Atmospheric Flux ◽  
High Enrichment ◽  
The Mean

Although snow cover is studied as an efficient scavenger for atmospheric mercury (Hg), up to now little is known about Hg behaviour in urban snow cover impacted by thermal power plants (TPPs) during the winter heating season. This study is focused on quantification of Hg in the particulate phase in snow cover and estimation of atmospheric particulate Hg (HgP) depositional fluxes around urban TPPs in cities of Omsk, Kemerovo, Yurga, Tomsk (the south part of Western Siberia, Russia) to provide new insight into Hg occurrence in urban snow. The results demonstrate that the mean Hg content in the particulate phase of snow varied from 0.139 to 0.205mg kg-1, possibly depending on thermal power of TPPs and fuel type used. The estimated mean atmospheric HgP depositional fluxes ranged from 6.6 to 73.1 mg km-2 d-1. Around thermal power plants atmospheric HgP depositional flux was controlled by particulate load. Higher Hg contents in the particulate phase of snow and higher atmospheric HgP depositional fluxes observed in relation to the background values, as well as high enrichment factors determined for Hg in the particulate phase of snow relative to the mean Hg content in the Earth’s crust showed that the snow pollution with Hg is of anthropogenic origin. The coexistence of Hg and S observed for the particulate phase of snow indicated the possible presence of mercury sulfide in this phase. The parameters like Hg content in the particulate phase of snow and HgP atmospheric flux can be used as markers for the identification of coal combustion emission sources.

Sign in / Sign up

Export Citation Format

Share Document