Emission Distribution and Regulation of Local Heat Source

2012 ◽  
Vol 326-328 ◽  
pp. 330-334 ◽  
Author(s):  
Jan Valíček ◽  
Jana Müllerová ◽  
Vlastimil Kuběna ◽  
Pavel Koštial ◽  
Marta Harničárová ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Chemical Composition ◽  
Human Health ◽  
Fossil Fuels ◽  
Local Heating ◽  
Point Of View ◽  
Total Production ◽  
Economic Point ◽  
Automated Method ◽  
Wide Range

Pollutants can be classified according to their chemical composition, harmfulness, hazardousness, risk rate and toxicity. The most monitored pollutants are particulate matter (PM), carbon monoxide (CO), nitrogen oxide (NOx), sulfur dioxide (SO2), organic substances which are in the form of gaseous phase in waste gases expressed as total organic carbon, dibenzodioxins and dibenzofurans [1-3]. Other pollutants are divided into several groups and subgroups, such as substances with carcinogenic effects (asbestos, Co, Cd, Be, Ni, As, Cr, dioxins, etc.), solid inorganic contaminants (He, Se, animony, and others) and inorganic pollutants in the form of gases (HCl, HF, ammonia, etc.), organic gases and vapours (phenol, toluene, acetone and many others) and gases causing the greenhouse effect (CO2, methane, N2O, hydrofluorocarbons, etc.). The term particulate matter, or suspended matter refers to the emissions of a wide range of wind drift solids and liquid particles of material in size from several nanometres up to 0.5 mm, which stay in the air for some time. This is a major component of atmospheric pollution, which contributes to harmful effects not only on human health but also on intensity of materials degradation. Into the atmosphere, where we can meet them, regardless of particle size and chemical composition, in the form of a complex heterogeneous mixture, they are released from burning fossil fuels and also from burning biomass-based fuels, while domestic heating accounts for about 16% of the total production of particulate matter [4,5,6]. This percentage represents a degree of imperfect combustion of fuels used in local heating. Emissions from incomplete combustion are undesirable from the point of view of human health as well as from the economic point of view, because this leads to the degradation of materials. Nevertheless, since fuel combustion is necessary for the society, emissions are still produced. This paper presents an automated method of perfect combustion control in local heating in order to minimize emissions being produced.

scholarly journals Production of Bio-ethanol from Solid Waste Paper Using Biological Activation

2021 ◽  
Author(s):  
Zeynu Shamil Awol ◽  
Rezika Tofike Abate
Keyword(s):  
Alternative Energy ◽  
Fossil Fuels ◽  
Point Of View ◽  
Biomass Energy ◽  
Dilute Acid ◽  
Dilute Acid Hydrolysis ◽  
Economic Point ◽  
Solid Ratio ◽  
Alternative Energy Sources ◽  
Waste Office Paper

Abstract Biomass energy is renewable energy source that comes from the material of plants and animals. Forms of biomass energy are bio-ethanol, bio methanol, and biodiesel. Bio-ethanol is one of the most important alternative energy sources that substitute the fossil fuels. The focus of this research is to produce bio-ethanol from waste office paper. Five laboratory experiments were conducted to produce bio-ethanol from wastepaper. The wastepaper was dried in oven and cut in to pieces. Then it passed through dilute acid hydrolysis, fermentation and distillation process respectively. High amount of ethanol was observed at 20 ml/g (liquid to solid ratio) and at the time of 2hr. Cost and economic analysis for ethanol production from wastepaper was performed. Results from the analysis indicated a paper to ethanol plant was feasible from the economic point of view with rate of return (RR) 38.61% and the payback period of 2.2 years.

Outlining a stepwise, multi-parameter debris flow monitoring and warning system: an example of application in Aizi Valley, China

2020 ◽  
Author(s):  
Ningsheng Chen
Keyword(s):  
Debris Flow ◽  
Early Warning ◽  
Pressure Sensors ◽  
Warning System ◽  
Point Of View ◽  
Economic Point ◽  
Flow Monitoring ◽  
Vibration Sensors ◽  
Wide Range ◽  
Critical Rainfall

<p>Abstract: In recent years, the increasing frequency of debris flow demands enhanced effectiveness and efficiency are essential not only from an economic point of view but are also considered as a frontline approach to alleviate hazards. Currently, the key issues are the imbalance between the limited lifespan of equipment, the relatively long period between the recurrences of such hazards, and the wide range of critical rainfall that trigger these disasters. This paper attempt to provide a stepwise multi-parameter debris flow warning system after taking into account the shortcomings observed in other warning systems. The whole system is divided into five stages. Different warning levels can be issued based on the critical rainfall thresholds. Monitoring starts when early warning is issued and it continues with debris flow near warning, movement warning and hazard warning stages. For early warning, historical archives of earthquake and drought are used to choose a debris flow susceptible site for further monitoring, Secondly, weather forecasts provide an alert of possible near warning. Hazardous precipitation, model calculation and debris flow initiation tests, pore pressure sensors and water content sensors are combined to check the critical rainfall and to publically announce a triggering warning. In the final two stages, equipment such as rainfall gauges, flow stage sensors, vibration sensors, low sound sensors and infrasound meters are used to assess movement processes and issue hazard warnings. In addition to these warnings, community-based knowledge and information is also obtained and discussed in detail. The proposed stepwise, multi-parameter debris flow monitoring and warning system has been applied in Aizi valley China which continuously monitors the debris flow activities.</p>

scholarly journals Direct Current (DC) Motor Speed and Direction Controller

2021 ◽  
Vol 2129 (1) ◽  
pp. 012035
Author(s):  
Nurshahirah Shaharudin ◽  
Mohd Zamri Hasan ◽  
Syatirah Mohd Noor
Keyword(s):  
Direct Current ◽  
Pulse Width Modulation ◽  
Speed Control ◽  
Dc Motor ◽  
Point Of View ◽  
Motor Speed ◽  
Variable Speed Drives ◽  
Variable Resistor ◽  
Economic Point ◽  
Wide Range

Abstract The direct current motor is an important drive configuration for many applications across a wide range of power and speeds. It has variable characteristics and is used extensively in variable-speed drives. The goals of this project are to control the direction and speed of a Direct Current (DC) motor. Due to the advancement of wireless technology, there are several communication devices introduced such as GSM, Wi-Fi, ZIGBEE and Bluetooth. Each of the connections has its own unique specification and application. Among these wireless connections, Bluetooth technology is often implemented and can be sent from the mobile phone at a distance of 10 meters. The speed control was implemented using Bluetooth technology to provide communication access from a smartphone. Instead, the ARDUINO UNO platform can be used to quickly promote electronic systems. And an electronics technique is called Pulse Width Modulation (PWM) is used to achieve speed control, and this technique generates high and low pulses, then these pulses vary the speed in the motor. In order to control this PWM pulse, variable resistors are used and depend on it the speed of the DC motor will increase or decrease. The variable resistor is adjusting to varying the speed of the motor, and the higher the resistance the lower the speed of the motor rotates. The direction of the motor is controlled by the relay by giving and giving a command on the virtual terminal. The speed of the motor is directly proportional to the resistance as the speed increased after the resistance also increased and vice versa. The significance of this study is practical and highly feasible from the economic point of view and has the advantage of running the motor at a higher rating in term of a reliable, durable, accurate and efficient way of controlling speed and direction control.

scholarly journals An Economic Model to Assess Profitable Scenarios of EAF-Based Steelmaking Plants under Uncertain Conditions

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7395
Author(s):  
Francesco Facchini ◽  
Giorgio Mossa ◽  
Giovanni Mummolo ◽  
Micaela Vitti
Keyword(s):  
Fossil Fuels ◽  
Direct Reduction ◽  
Steel Production ◽  
Economic Assessment ◽  
Basic Oxygen Furnace ◽  
Point Of View ◽  
Steel Scrap ◽  
Environmental Costs ◽  
Market Uncertainty ◽  
Economic Point

The steelmaking processes are considered extremely energy-intensive and carbon-dependent processes. In 2018, it was estimated that the emissions from global steel production represented 7–9% of direct emissions generated by fossil fuels. It was estimated that a specific emissions value of 1.8 tCO2 per ton of steel was produced due to the carbon-dependent nature of the traditional blast furnace and basic oxygen furnace (BF-BOF) route. Therefore, it is necessary to find an alternative solution to the BF-BOF route for steel production to counteract this negative trend, resulting in being sustainable from an environmental and economic point of view. To this concern, the objective of this work consists of developing a total cost function to assess the economic convenience of steelmaking processes considering the variability of specific market conditions (i.e., iron ore price, scraps price, energy cost, etc.). To this purpose, a direct reduction (DR) process fueled with natural gas (NG) to feed an electric arc furnace (EAF) using recycled steel scrap was considered. The approach introduced is totally new; it enables practitioners, managers, and experts to conduct a preliminary economic assessment of innovative steelmaking solutions under market uncertainty. A numerical simulation has been conducted to evaluate the profitability of the investment considering the economic and environmental costs. It emerged that the investment is profitable in any case from an economic perspective. On the contrary, considering the environmental costs, the profitability of the investment is not guaranteed under certain circumstances.

scholarly journals Sources of PM10 Air Pollution in Rural Area in the Vicinity of a Highway In Žilina Selfgoverning Region, Slovakia

2015 ◽  
Vol 11 (1) ◽  
pp. 58-68 ◽  
Author(s):  
Dušan Jandačka
Keyword(s):  
Particulate Matter ◽  
Power Plants ◽  
Fossil Fuels ◽  
Road Traffic ◽  
Chemical Elements ◽  
Local Heating ◽  
Harmful Effect ◽  
Primary Source ◽  
Anthropogenic Sources ◽  
The Road

Abstract Particulate matter results as an aftermath of numerous distinctive processes in the atmosphere and they become a part of everyday life. Their harmful effect and impact on the ambient environment is determined predominantly by the presence of various chemical substances and elements. The chemical composition of these particles (organic and elemental carbon, mineral dust, sea aerosols, secondary particles, especially sulphates and nitrates, heavy metals and further elements) is mainly impacted on by their origin, whereas the primary source of the particulate matter is determined and specified by the profile of chemical elements and substances. Particulate Matter (PM) may originate in various natural resources or anthropogenic sources. Among the natural sources sea salt is to be counted on, dust of the earth crust, pollen and volcanic ashes. Anthropogenic sources do include, predominantly, burning fossil fuels in the fossil-fuel power plants, local heating of households, burning liquefied fossil fuels in the combustion engines of vehicles, noncombustion related emissions as a result of vehicular traffic, resuspension of the road-traffic-related dust.

Cryptospordiosis: An infectious emerging protozoan zoonosis of public health significance

2021 ◽  
Vol 6 (4) ◽  
pp. 161-163
Author(s):  
Mahendra Pal ◽  
Mati Roba Bulcha ◽  
Adugna Girma Lema ◽  
Sena Roba Bulcha
Keyword(s):  
Public Health ◽  
Point Of View ◽  
Watery Diarrhea ◽  
Low Grade ◽  
Economic Point ◽  
Source Of Infection ◽  
Animal Populations ◽  
Wide Range ◽  
The World ◽  
Hygienic Measures

Zoonoses caused by diverse etiological agents, are important from public health and economic point of view, and are reported in humans and animals from developing and developed nations of the world. Cryptosporidiosis is an emerging food and waterborne zoonotic protozoan disease that has been detected in both human and animal populations all over the world. The source of infection is exogenous, and the ingestion of contaminated food and water is the principal mode of transmission. The oocysts of Cryptosporidium are abundant and pervasive in ambient water, where they can survive for months. It prefers epithelial cells found in the digestive tracts of a wide range of hosts. Waterborne transmission through drinking water or a swimming pool is common, resulting in outbreaks in several nations throughout the world. The disease can manifest itself in sporadic or epidemic forms. The infection has been recorded in immunocompetent and immunocompromised individuals. The watery diarrhea, abdominal cramps, nausea, anorexia and low grade fever are most commonly observed symptoms. The laboratory help is required to make an unequivocal diagnosis of disease. The preventive strategies include excellent hygienic measures to avoid the contamination of food and water by oocysts of Cryptosporidium. In addition, the role of veterinarian is highly imperative for the management of disease in domestic animals.

Availability and Post-harvest losses of fruits and vegetable in Bihar: Economic Analysis

2016 ◽  
Vol 1 (02) ◽  
pp. 207-212
Author(s):  
Meera Kumari ◽  
Shoji Lal Bairwa ◽  
Lokesh Kumar Meena ◽  
Sk. M. Rahman
Keyword(s):  
State Government ◽  
Fruits And Vegetables ◽  
Point Of View ◽  
Human Consumption ◽  
Total Production ◽  
Air Cargo ◽  
Fruit And Vegetable ◽  
Scope For Growth ◽  
Post Harvest ◽  
Wide Range

Bihar is the rich state with abundance natural resources and wide range of diversity in agriculture in comparison to other growing states of the country.Horticultural crops constitute a significant component of total agricultural production of the country and cover nearly 11.6 million ha area with a total production of over 91 million tonnes per year. Production of fruits and vegetables play an important role in generating employment, income and meeting household nutritional security. The combined annual production of fruits and vegetables in India is likely to cross 377 million tonnes (MT) mark by 2021 from the current level of over 227 MT. However, the projected production of fruits and vegetables would only cater to domestic demand leaving no scope for growth on export front due to the huge wastage would continue to rise simultaneously in absence of on-farm processing facilities. Post-harvest losses are very high in fruit, vegetables and root crops as they are much less hardy and are quickly perishable, and if care is not taken in their harvesting, handling and transport, they soon decay and become unfit for human consumption. The importance of post-harvest management for fruit and vegetable trade should not be ignored. New strategies need to be developing to promote adoption of post-harvest technology by the fruit and vegetable growers for good marketing. The creation of market infrastructure from export point of view such as creation of pre- cooling, cold storage, air cargo, packinghouse etc. may be taken up by the concerted efforts of the state government. There is also need to develop the efficient marketing systems with better storage facilities and less number of middlemen for the ultimate welfare of farmers. Thus, the policy makers should promote processing of fruits and vegetables for value addition and also explore export avenues.

scholarly journals Mites (Acari) important in different agroecosystems and their control in Romania*

Zoosymposia ◽  
2011 ◽  
Vol 6 (1) ◽  
pp. 45-50
Author(s):  
IOAN ROSCA ◽  
MINODORA GUTUE ◽  
CATALIN GUTUE
Keyword(s):  
Crop Production ◽  
Agricultural Land ◽  
Point Of View ◽  
Effective Control ◽  
Active Ingredients ◽  
Polyphagotarsonemus Latus ◽  
Commercial Products ◽  
Economic Point ◽  
Wide Range ◽  
Broad Mite

Mite problems in different agroecosystems in Romania are presented. Of all phytophagousmites known in the country, four species are found on a wide range of crops, with the two-spotted spider mite, Tetranychus urticae Koch, and the broad mite, Polyphagotarsonemus latus (Banks), being the most important. The broad mite is difficult to control, but acaricides registered in Romania have provided effective control of this species. Reduction of highly toxic pesticide residues in the environment has been considered important in the country. That could be approached by first reducing the amount of pesticides applied on agricultural land, and second, by finding new pesticides with less toxic active ingredients. This has resulted in reduced numbers of the main groups of pesticides, commercial products and number of active substances. The number of available commercial products varied from12 in 1972–1979 to five in 1980–1989, ten in 1990–1996, four in 1997–2004 and six in 2010, based on five active ingredients. The causes of the decreasing numbers of acaricide products or active ingredients were the reduced availability of several active ingredients due to toxicological or environmental reasons and the high registration cost. Only three acaricides (Envidor 240 SC, Nissorun 10WP and Omite 570 EC) and one insecticide/acaricide (Seizer 10 EC) are at present commonly used in Romanian agriculture.At the same time, from the economic point of view, biological control is impractical if not impossible to be applied in commercial crop production under Romanian economical conditions of farmers in absence of subsidies. EU and Romanian policies are discussed.

Energy, Environment, and Economical Advantages of Solar Thermal Cracking of Natural Gas

2012 ◽  
Author(s):  
Nesrin Ozalp
Keyword(s):  
Natural Gas ◽  
Carbon Black ◽  
Fossil Fuels ◽  
Petroleum Industry ◽  
World Market ◽  
Point Of View ◽  
Solar Thermal ◽  
Gas Combustion ◽  
Economic Point ◽  
Energy Environment

Among all fossil fuels, natural gas is probably the most attractive one because of its higher heating value, and approximately 97% methane content, which creates less hazardous emissions during power generation. Considering these important facts and the demand for natural gas in the world market, it would be unlikely to think of converting natural gas. However, if we want to utilize our planet’s limited natural gas resources better, then we need to explore alternative ways. A way to achieve that goal is direct cracking of natural gas via solar thermal processing. This paper describes advantages of solar cracking of natural gas from energy, environment and economic point of view. Results show that products of natural gas decomposition contain 8% more energy per mole compared to natural gas itself, while the decomposition process does not emit any hazardous emissions to the environment. As for the economics, once the decomposition products of natural gas, namely hydrogen and carbon black, are sold separately, it is possible to make up to three times more revenue than the selling of natural gas. The products of natural gas decomposition have a very wide use in chemical and petroleum industries. For example, hydrogen is a crucial commodity to refine crude oil, while carbon black is the fundamental component in car tire, battery, conveyer belt, and printer ink manufacturing industries. Currently, petroleum industry produces hydrogen via steam reforming of methane and the chemical industry produces carbon black from coal or natural gas combustion in furnace, which are both highly toxic and global warming emissive processes. With solar cracking of natural gas, these two important commodities can be produced without any emissions to the environment.

scholarly journals Chemical composition, optical properties and radiative forcing efficiency of nascent particulate matter emitted by an aircraft turbofan burning conventional and alternative fuels

2018 ◽  
Author(s):  
Miriam Elser ◽  
Benjamin T. Brem ◽  
Lukas Durdina ◽  
David Schönenberger ◽  
Frithjof Siegerist ◽  
...  
Keyword(s):  
Optical Properties ◽  
Particulate Matter ◽  
Chemical Composition ◽  
Radiative Forcing ◽  
Alternative Fuels ◽  
Measurement Data ◽  
Particulate Emissions ◽  
Low Thrust ◽  
Fuel Blends ◽  
Wide Range

Abstract. Aircraft engines are a unique source of carbonaceous aerosols in the upper troposphere. There, these particles can more efficiently interact with solar radiation than at ground. Due to the lack of measurement data, the radiative forcing from aircraft particulate emissions remains uncertain. To better estimate the global radiative effects of aircraft exhaust aerosol, its optical properties need to be comprehensively characterized. In this work we present the link between the chemical composition and the optical properties of the particulate matter (PM) measured at the engine exit plane of a CFM56-7B turbofan. The measurements covered a wide range of power settings (thrust), ranging from ground idle to take-off, using four different fuel blends of conventional Jet A-1 and Hydro-processed Ester and Fatty Acids (HEFA) biofuel. At the two measurement wavelengths (532 and 870 nm) and for all tested fuels, the absorption and scattering coefficients increased with thrust, as did the PM mass. The separation of elemental carbon (EC) and organic carbon (OC) revealed a significant mass fraction of OC (up to 90 %) at low thrust levels, while EC mass dominated at medium and high thrust. The use of HEFA blends induced a significant decrease in the PM mass and the optical coefficients at all thrust levels. The HEFA effect was highest at low thrust levels, where the EC mass was reduced by up to 50–60 %. The variability in the chemical composition of the particles was the main reason for the strong thrust dependency of the single scattering albedo (SSA), which followed the same trend as the OC fraction. Mass absorption coefficients (MAC) were determined from the correlations between aerosol light absorption and EC mass concentration. The obtained MAC values (MAC532 = 7.5 ± 0.3 m2 g−1 and MAC870 = 5.2 ± 0.9 m2 g−1) are in excellent agreement with previous literature values of absorption cross section for freshly generated soot. The Simple Forcing Efficiency (SFE) was used to evaluate the direct radiative effect of aircraft particulate emissions for various ground surfaces. The results indicate that aircraft PM emissions over highly reflective surfaces like snow or ice have a substantial warming effect. The use of the HEFA fuel blends decreased PM emissions, but no changes where observed in terms of EC/OC composition, optical properties and forcing per mass emitted.

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