Biomass fuel production from cellulosic sludge through biodrying: Aeration strategies, quality of end-products, gaseous emissions and techno-economic assessment

2021 ◽  
Vol 126 ◽  
pp. 487-496
Author(s):  
N. Guerra-Gorostegi ◽  
D. González ◽  
B. Puyuelo ◽  
J. Ovejero ◽  
J. Colón ◽  
...  
Keyword(s):  
Economic Assessment ◽  
Biomass Fuel ◽  
Gaseous Emissions ◽  
Fuel Production ◽  
End Products

scholarly journals Alternative solid fuels combustion in small heat source

2018 ◽  
Vol 168 ◽  
pp. 08002 ◽  
Author(s):  
Michal Holubčík ◽  
Nikola Kantová ◽  
Jozef Jandačka ◽  
Zuzana Kolková
Keyword(s):  
Heat Source ◽  
Alternative Fuels ◽  
Beech Wood ◽  
Major Influence ◽  
Heat Output ◽  
Heat Sources ◽  
Gaseous Emissions ◽  
Output Efficiency ◽  
Negative Factors

Air quality is related to the using of solid fuel based heat sources in which the human factor has a major influence on the quality of combustion, which can lead to higher emissions into the air. One of the negative factors is the use of alternative fuels in heat sources. The article deals with the combustion of various alternative fuels, on a waste basis, in small heat sources. There were tested 4 types of fuels: beech wood pieces, 2 types of solid alternative fuel on the base of municipal waste and wood waste. In the experiment, it was tested the influence of used fuel in the fireplace on the heat output, efficiency, production of gaseous emissions and particulate matter. The results confirmed that combustion of fuels not recommended by the heat source manufacturer reduces the efficiency of combustion and significantly increases all monitored emissions.

Study of external factors to minimize segregation of granular particles

2020 ◽  
Vol 31 (10) ◽  
pp. 2050147
Author(s):  
Saleema Panda ◽  
Danielle S Tan
Keyword(s):  
Food Processing ◽  
External Factors ◽  
Small Scale ◽  
Pharmaceutical Chemical ◽  
Wall Roughness ◽  
Related Factors ◽  
End Products ◽  
Granular Particles ◽  
Scale Experiment

Segregation of granular particles affects the quality of end products in the pharmaceutical, chemical and food processing industries. Many researchers have worked on controlling the mechanical properties of granular particles to minimize segregation. In this paper, we studied different chute-related factors — inclination angle, friction, fill, channel geometry and base profile — and their effects on segregation. We conducted a small-scale experiment with chute inclined at different angles, and also numerical simulations performed using an open-source discrete element method (DEM) code — LIGGGHTS. We found the optimal condition for minimum segregation of a binary granular mixture. We concluded that segregation is minimized if the stream-wise velocity is low, for example, by keeping the chute at a low inclination [Formula: see text] and increasing the wall roughness to 0.14.

scholarly journals Az informális ellátás mérése és egészség-gazdaságtani értékelése

2017 ◽  
Vol 158 (35) ◽  
pp. 1363-1372
Author(s):  
Zsombor Zrubka
Keyword(s):  
Quality Of Life ◽  
Health Economic ◽  
Informal Care ◽  
Economic Assessment ◽  
Future Research ◽  
Health Related Quality ◽  
Practical Applications ◽  
Related Quality ◽  
Health Related

Abstract: Informal care is non-financed care outside the realm of formal healthcare, which represents an increasing challenge for aging societies. Informal care has frequently been neglected in health economic analyses, while in recent years its coverage has increased considerably in the international scientific literature. This review summarizes the methodology of the health-economic assessment of informal care, including the objective and subjective metrics of caregiver burden, its financial and non-financial valuation and practical applications, with special emphasis on the introduction of care-related quality of life instruments (e.g. Care Related Quality of Life – CarerQoL instrument). Care-related quality of life is a different entity from health-related quality of life, the two cannot be combined, so their joint evaluation requires multi-criteria decision analysis methods. Therefore, it is important to determine the societal preferences of care-related quality of life versus health-related quality of life, and map the relationship of care-related quality of life with time. The local validation of tools measuring care-related quality of life, its more widespread practical application and the analysis of its effect on decision making are also important part of the future research agenda. Orv Hetil. 2017; 158(35): 1363–1372.

scholarly journals Multivariable Tracking Control of a Bioethanol Process under Uncertainties

2020 ◽  
Vol 2020 ◽  
pp. 1-16 ◽  
Author(s):  
M. Cecilia Fernández ◽  
M. Nadia Pantano ◽  
Emanuel Serrano ◽  
Gustavo Scaglia
Keyword(s):  
Tracking Control ◽  
Alternative Fuels ◽  
Tracking Error ◽  
Performance Comparison ◽  
Model Errors ◽  
Fuel Production ◽  
Simple Modification ◽  
External Perturbations ◽  
Process Complexity

Bioethanol is one of the most studied alternative fuels nowadays. Due to its production process complexity and the low quality of the mathematical models that describe it, a reliable controller is needed to maximize the fuel production and minimize its environmental impact, even in the presence of uncertainty. Here, a controller for tracking optimal profiles considering model errors and external perturbations is proposed. This work is an improvement of a previously presented technique. To reduce the earlier mentioned uncertainties’ effect during the fermentation, some tracking error integrators are added in the control action calculation. This simple modification ensures the tracking error convergence to zero, even in the presence of uncertainties (demonstration available). Different tests are carried out and a performance comparison with the original controller is shown to highlight improvements in the tracking error of up to 98% when integrators are incorporated. Furthermore, a classical PI controller is contrasted with the proposed techniques.

scholarly journals Exploration Strategy Development and Performance Management: a Portfolio-based Approach

GeoArabia ◽  
2001 ◽  
Vol 6 (4) ◽  
pp. 553-570
Author(s):  
Michael A. Naylor ◽  
Laurent Y. Spring
Keyword(s):  
Performance Management ◽  
Portfolio Management ◽  
Performance Monitoring ◽  
Economic Assessment ◽  
Strategy Development ◽  
Activity Levels ◽  
Management Tools ◽  
And Performance ◽  
Petroleum Development

ABSTRACT In Petroleum Development Oman (PDO), the exploration opportunity portfolio is managed by a dedicated team responsible for its integrity and analysis. The team uses a customized suite of tools for volumetric and economic assessment that has been developed since 1997. In addition to their application in quality control, regular performance monitoring and reporting, the tools are used to determine annual finding targets and formulate exploration strategies. The portfolio management process in PDO has made a major contribution to the quality of prospects that are selected for drilling. Thanks to new evaluation processes and a robust suite of tools, the company has a better understanding of the composition and quality of the prospect portfolio, and is explicitly aware of the challenges and issues facing exploration. Portfolio management tools enable objective target setting and communication, thereby achieving shared ownership. The clarity brought by portfolio analyses provides a powerful focus to the asset teams’ efforts to improve prospect quality. PDO is also able to quantify the consequences of changing activity levels and balance in the program, and of the limitations imposed by the portfolio. These provide the basis for ongoing dialogue with shareholders and justify the strategy shift towards frontier exploration enacted since 1998. Exploration in PDO has shifted from being opportunity-driven to being led by a portfolio-based strategy. A similar approach may be suited to other exploration ventures with sizeable portfolios.

scholarly journals Improving the quality of life in cities using community gardens: from benefits for members to benefits for all local residents

GeoScape ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 68-78 ◽  
Author(s):  
Lenka Dubová ◽  
Jan Macháč
Keyword(s):  
Quality Of Life ◽  
Cost Benefit Analysis ◽  
Research Question ◽  
Community Gardens ◽  
Cost Benefit ◽  
Economic Assessment ◽  
Social Benefits ◽  
Community Garden ◽  
Local Residents

Abstract Recent effects of globalization, urbanization and climate change have resulted in an increasing interest in the quality of life in cities and seeking pathways for its improvement. At the same time, there are changes in society and lifestyles that may challenge or facilitate these pathways. Community gardens (CGs) represent an effort to provide more sustainable urban economies, while reflecting on the public demand for cultivation of own crops. However, members of CGs may not perceive all the benefits that CGs provide for their surroundings. Using two case studied from Czechia (CG Kuchyňka and CG Vidimova in Prague) the aim of this paper is a comparison of the benefits perceived by community garden members and the evaluated net social benefits of community gardens in cities for all local residents. Through a questionnaire survey, the paper answers the research question of the benefits of community gardens perceived by community garden members. An economic assessment based on cost-benefit analysis was made to answer the question of the value of the net social benefits of community gardens in cities. Our comparison shows that the net social benefits are higher than perceived by their members. Net present benefits of EUR 31 550 for CG Kuchyňka and EUR 1 175 for CG Vidimova were quantified in a 50-year horizon. This economic analysis should contribute to greater support for community gardens by city governments and spatial planners.

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