scholarly journals Correlation Study on Operation of the Wet FGD System and Incomplete Coal Combustion

2020 ◽  
Vol 15 ◽  
Keyword(s):  
Large Range ◽  
Thermal Power ◽  
Combustion Process ◽  
High Standard ◽  
Correlation Study ◽  
Coal Quality ◽  
Incomplete Combustion ◽  
Optimum Solution ◽  
Sulphur Removal

A Wet Flue Gas Desulfurization (WFGD) system operating at thermal power plant Rovinari (Romania), was considered in this study in an attempt to establish mutual or uni-directional influences between the performance of the sulphur removal process and the quality of the combustion process. Although in theory the WFGD system operates automatically with parameters controlled in such way that optimum removal efficiency is obtained, some parameters cannot be fully controlled, especially those that could not be anticipated at the design of the WFGD system. Sulphur removal systems are customizable to some extent but cannot provide an optimum solution for any plant, given the large range of differences between various plants. Coal quality is such a parameter, for which a large range of values and high standard deviation exists. Incomplete combustion is a serious issue caused by low coal quality resulting in significant losses. Briefly, incomplete combustion process is equivalent to coal that is injected in the furnace but does not undergo combustion or undergoes a partial combustion, being eventually evacuated from the boiler. This study attempts to identify quantitative and qualitative influence of incomplete combustion on the operation of the FGD system

Exergy Recuperation of Mid and Low Quality Heat by Chemical Reactions

2011 ◽  
Author(s):  
Takao Nakagaki ◽  
Takayuki Ozeki ◽  
Yuuta Watanabe
Keyword(s):  
Power Generation ◽  
Gas Turbines ◽  
Thermal Power ◽  
Combustion Process ◽  
Electric Energy ◽  
Thermal Conversion ◽  
Maximum Temperature ◽  
Chemical Heat ◽  
Unified Index

Conventional thermal power generation, as typified by gas turbines, has steadily increased power generation efficiency by elevating temperature of heat, but there is a limit to the maximum availability of electric energy. Exergy rate is a unified index indicating the quality of energy in deferent forms. We have no way in thermal conversion to extract all of the availability, while almost hydrocarbon fuels have exergy rate around 95%. 25% of exergy is inevitably lost through the combustion process from chemical to heat at maximum temperature of 2000°C. Hydrogen’s low exergy rate provides “exergy recuperation” in which degrading 12% from 95% to 83% can take low quality heat up to availability of 83% as a kind of chemical heat pump. Chemically Recuperated Gas Turbine (CRGT) is a specific example, and dimethyl ether (DME) is one of the most suitable fuels because steam reforming occurs around 300°C. Electrochemical partial oxidation (EPOx) is another way to convert mid-quality heat into electric energy as much as difference between change in Gibbs free energy and change in enthalpy. This paper reports concept and industrially-feasible applications of this unconventional and non-cascadic use of heat.

Determination of Traces Heavy Metals from Solid Residues Formed by Combustion of Lignite in Relation to Degree of Accessibility in Soil and Plants

2017 ◽  
Vol 68 (10) ◽  
pp. 2363-2366
Author(s):  
Delia Nica Badea
Keyword(s):  
Heavy Metals ◽  
Power Plant ◽  
Thermal Power ◽  
Reference Value ◽  
Combustion Products ◽  
Toxic Heavy Metals ◽  
Area Of Influence ◽  
Risk Potential

The paper evaluates the presence and content of traces of heavy metals Hg, Pb, Ni, Cd (total forms) from coal and solid combustion products, the degree of transfer and accessibility in the area of influence of a lignite power plant. The content of toxic heavy metals in residues are characterized by RE Meiji [ 1 (Pb and Hg) and REMeij �1 (Ni and Cd) for the filter ash. Pb and Ni content in the soil exceeds normal values, and Pb exceeds and alert value for sensitive soils around the residue deposit (70.20 mg.Kg-1). The degree of accessibility of the metals in plants (TF), reported at the Khan reference value (0.5), indicates a significant bioaccumulation level for the metals: Cd (1.9) and Hg (0.6) inside the deposit; Cd (0.39) at the base of the deposit, Hg (0.8) in the area of the thermal power plant. The trace levels of heavy metals analyzed by GFAAS and CVAAS (Hg), indicates a moderate risk potential for food safety and quality of life in the studied area.

Self Management Menentukan Kualitas Hidup Pasien Diabetes Mellitus

2019 ◽  
Vol 4 (2) ◽  
pp. 402
Author(s):  
Iskim Luthfa ◽  
Nurul Fadhilah
Keyword(s):  
Quality Of Life ◽  
Diabetes Mellitus ◽  
Correlation Study ◽  
Self Management ◽  
Rank Test ◽  
P Value ◽  
Cross Sectional ◽  
Spearman Rank ◽  
Consecutive Sampling

<p><em>People with diabetes mellitus are at risk of developing complications, so that it affects the quality of life. These complications can be minimized through self-care management. This study aims to determine the relationship between self management with the quality of life for people with diabetes mellitus. This research is a kind of quantitative research with correlation study. This research used cross sectional design. The sampling technique uses non probability with estimation consecutive sampling. The number of respondents in this research are 118 respondents. Instrument for measuring self management used diabetes self management questionnaire (DSMQ), and instruments to measure quality of life used quality of life WHOQOL-BREEF. The data obtained were processed statistically by using spearman rank test formula and p value of 0,000 There is a significant relationship of self management with the quality of life of people with diabetes mellitus.</em></p><p> </p><p><em>Penderita </em><em>Diabetes mellitus </em><em>beresiko mengalami komplikasi yang dapat mempengaruhi kualitas hidupnya. Komplikasi tersebut dapat diminimalkan melalui manajemen perawatan diri (self management). Penelitian ini bert</em><em>ujuan </em><em>untuk</em><em> menganalisis hubungan self management dengan kualitas hidup pasien diabetes melitus. </em><em>Jenis p</em><em>enelitian ini </em><em>adalah</em><em> deskriptif korelasi</em><em> dengan desain cross sectional</em><em>. Teknik pengambilan sampel menggunakan non probability </em><em>sampling </em><em>dengan pendeka</em><em>t</em><em>an consecutive sampling</em><em>.</em><em> </em><em>J</em><em>umlah </em><em>sampel sebanyak</em><em> </em><em>118 responden.</em><em> </em><em>Instrumen </em><em>penelitian </em><em>untuk mengukur self management </em><em>menggunakan</em><em> </em><em>diabetes self management questionnaire</em><em> (DSMQ), </em><em>dan instrumen untuk mengukur kualitas hidup menggunakan </em><em>quality of life </em><em>WHOQOL-BREEF.</em><em> Analisis data menggunakan spearman rank dan didapatkan hasil nilai </em><em>p value 0,000</em><em> dan r 0,394.Terdapat </em><em>hubungan </em><em>antara </em><em>self management</em><em> dengan kualitas hidup pasien diabetes mellitus</em><em> dengan arah korelasi positif.</em></p>

scholarly journals The Analysis of Influence of the Gangue in the Coal as Fired on the Coal Conveying System and the Boiler Operation of the Circulating Fluidized Bed Unit

2019 ◽  
Vol 118 ◽  
pp. 02011
Author(s):  
Su Pan ◽  
Yu Pengfeng ◽  
Linbo Liu ◽  
Han Jing ◽  
Xiao Shen
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Storage Conditions ◽  
Coal Gangue ◽  
Quality Data ◽  
Stable Operation ◽  
Coal Quality ◽  
Boiler Operation ◽  
Conveying System

The coal as fired, with unidentified characteristics of the coal gangue, was burned on a 300MW circulating fluidized bed unit. The equipment of the coal conveying system was damaged and the boiler operation was unstable. In response to the problems, the coal quality data and storage conditions of the coal were examined and the site was spot-checked to evaluate the coal quality characteristics. At the same time, the typical representative parameters of the coal handling system and boiler operation were selected. According to the analysis of coal quality and coal storage, the coal quality fluctuates greatly and the uniformity of particle size distribution is poor. There is actually the coal gangue with hard texture and hard to grind in the coal pile. The coal gangue will have adverse effects on the fine screening machine, fine crusher and other equipment. After burned this type of coal, the fluidized quality of the boiler bed is degraded to make an impact on the safe and stable operation of the boiler. It is recommended that the coal should be screened and then burned into the furnace to ensure safe and stable operation of the boiler.

scholarly journals Regenerative Endodontic Procedures: An Umbrella Review

2021 ◽  
Vol 18 (2) ◽  
pp. 754
Author(s):  
Luísa Bandeira Lopes ◽  
João Albernaz Neves ◽  
João Botelho ◽  
Vanessa Machado ◽  
José João Mendes
Keyword(s):  
Methodological Quality ◽  
Primary Outcome ◽  
Web Of Science ◽  
High Standard ◽  
Measurement Tool ◽  
Clinical Protocols ◽  
Umbrella Review ◽  
Electronic Database Search ◽  
Specific Section

The Regenerative Endodontic Procedure (REP) is a biologically based method in which a damaged pulp–dentin complex is replaced by a new vital tissue. This umbrella review aimed to critically assess the available systematic reviews (SRs) on REP. An electronic database search was conducted (PubMed-Medline, CENTRAL, Scielo, Web of Science, and LILACS) until December 2020. Studies were included if they were an SR on REP. The Risk of Bias (RoB) of SRs was analyzed using the Measurement Tool to Assess SRs criteria 2 (AMSTAR2). The primary outcome was the methodological quality in each specific section of REP protocols and outcomes. From 403 entries, 29 SRs were included. Regarding the methodological quality, ten studies were of critically low, three of low, fourteen of moderate, and two were rated as high quality. The quality of evidence produced by the available SRs was not favorable. Future high standard SRs and well-designed clinical trials are warranted to better elucidate the clinical protocols and outcomes of REP.

Standard minimi di qualitŕ: un approccio teorico

2012 ◽  
pp. 29-41
Author(s):  
Grassi Iacopo
Keyword(s):  
High Standard ◽  
Policy Instrument ◽  
Quality Standard ◽  
Average Quality ◽  
Proposed Model ◽  
Positive Externality ◽  
Experience Good ◽  
The Government ◽  
Minimum Quality

At least since Akerlof (1970), asymmetric information in the case of experience goods has been a central issue in the economic literature. This paper studies regulation in markets where the quality of the experience good is never completely verifiable by consumers even after purchase. In the proposed model firms can decide the quality of the good: always producing a high quality good creates a positive externality in the market, but it causes an incentive to the firms to deviate and produce low quality goods. The main policy instrument for the government, in order to maximize Social Welfare, is to fix a minimum quality standard, but imposing a too high standard might, in some cases, lower the average quality of the good in the market.

Job

1975 ◽  
Author(s):  
Marvin H. Pope
Keyword(s):  
Special Interest ◽  
World Literature ◽  
High Standard ◽  
Dead Sea ◽  
Middle Section ◽  
Concerted Effort ◽  
Book Of Job ◽  
Divine Justice ◽  
Traditional Image

This third edition of the Anchor Bible Book Of Job (Volume 15 in the series) contains numerous new, revised or augmented notes. Of special interest is the inclusion of readings from the earliest translation of the Book Of Job, the recently published Targum (Aramaic translation) recovered from Cave XI of Khirbet Qumran, in the Judean Wilderness near the Dead Sea, perhaps the version which was suppressed by Rabbi Gamaliel. The Book Of Job is one of the indisputably great works of world literature. The story is well-known: a prosperous and happy man, distinguished for rectitude and piety, falls victim to a series of catastrophes. And the occasion (if not the reason) for these undeserved calamities: Satan's challenge to Yahweh to test the sincerity of Job's faith. It is by now proverbial to refer to the patience of Job. Yet this traditional image derives only from the Prologue and the Epilogue of the book. But the Job who confronts us in the long middle section is anything but patient. His outcries against God raise the question of theodicy, or divine justice, which occupies the greater portion of Job's Dialogue with his comforters. But it is inevitably as literature that Job must be read and enjoyed. This translation is marked by a concerted effort to capture as much as possible the poetic and metrical characteristics of the original Hebrew: the result is a version notable for its accuracy and directness. The experience of reading the Book Of Job in this translation, then, is to rediscover an exceedingly eloquent masterpiece. In the terse, rhythmic quality of the translation, the incisive comprehensiveness of the introduction and notes, Job maintains the high standard of scholarship, literateness, and readability established in The Anchor Bible.

scholarly journals Comparative Analysis of Houses Built from Insulating Concrete Formwork – case Study

2015 ◽  
Vol 10 (2) ◽  
pp. 139-146
Author(s):  
Daniela Mačková ◽  
Marcela Spišáková
Keyword(s):  
High Standard ◽  
Modern Method ◽  
Technological Parameters ◽  
Optimal Method ◽  
House Construction ◽  
The Subject ◽  
Technical Cost ◽  
Skills Shortages

Abstract More and more, people are looking to build and live in different ways. They want houses with a high standard of living and reasonable production and maintenance costs. However, they also want to build a way that does not adversely affect their quality of life. Currently, the using of modern methods of construction (MMC) expands consistently year on year. MMC include prefabricated products made in the factory and also new methods of building that are site-based and they are regarded as a means of achieving higher quality, reducing time spent onsite, increasing safety and overcoming skills shortages in the industry. Aim of this paper is to analyze and compare, trough case study, technical, cost and technological parameters of house built by modern method of construction (from insulating concrete formwork) and by traditional method (from brick system). The subject of case study is house modeled in two variants of insulating concrete formwork and a variant bricks and ceiling system. In conclusion, there is selected optimal method and system for house construction through multicriteria optimization.

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