scholarly journals Research of Technology of Producing Composite Fuel Based on Nephelometric Method

2021 ◽  
Vol 7 (6) ◽  
Author(s):  
U. Abdaliev
Keyword(s):  
Acetic Acid ◽  
Free Radicals ◽  
Heating Temperature ◽  
Voltage Source ◽  
Component Ratio ◽  
Stable Combustion ◽  
Nephelometric Method ◽  
Composite Fuel ◽  
Benzene Toluene ◽  
Alcohol Benzene

The article experimentally investigated that using a carboxylic acid (acetic acid), non-free radicals of saturated hydrocarbons (gasoline, kerosene, white alcohol, benzene, toluene, acids, etc.) are split and form free radicals, after which a chemical reaction occurs in as a result of which new connections are formed. A stable milk-emulsion composite fuel was obtained by the nephelometric method, with the following component ratio: 5:0.2:4.8 (50% gasoline, 2% glacial acetic acid, 48% ordinary water). After obtaining a stable milk-emulsion composite fuel, combustion was carried out and the process of stable combustion was determined. The pressure of the composite fuel in the container is increased to 3 kg/cm2 to obtain an aerosol at the nozzle outlet. The aerosol ignites inside the nichrome coil, the heating temperature is about 500 °C. To maintain the process of stable combustion of the composite fuel, the spiral is connected to a 20-volt voltage source.

Lowering Equivalence Ratio Limit for Stable Combustion in Gas Turbines by Injection of Free Radicals

2011 ◽  
Author(s):  
Yeshayahou Levy ◽  
Vladimir Erenburg ◽  
Valery Sherbaum ◽  
Vitali Ovcharenko ◽  
Leonid Rosentsvit ◽  
...  
Keyword(s):  
Free Radicals ◽  
Gas Turbines ◽  
Equivalence Ratio ◽  
Nox Reduction ◽  
Combustion Process ◽  
Combustion Regime ◽  
Combustion Stability ◽  
Nox Formation ◽  
Stable Combustion ◽  
Lean Premixed

Lean premixed combustion is one of the widely used methods for NOx reduction in gas turbines (GT). When this method is used combustion takes place under low Equivalence Ratio (ER) and at relatively low combustion temperature. While reducing temperature decreases NOx formation, lowering temperature reduces the reaction rate of the hydrocarbon–oxygen reactions and deteriorates combustion stability. The objective of the present work was to study the possibility to decrease the lower limit of the stable combustion regime by the injection of free radicals into the combustion zone. A lean premixed gaseous combustor was designed to include a circumferential concentric pilot flame. The pilot combustor operates under rich fuel to air ratio, therefore it generates a significant amount of reactive radicals. The experiments as well as CFD and CHEMKIN simulations showed that despite of the high temperatures obtained in the vicinity of the pilot ring, the radicals’ injection from the pilot combustor has the potential to lower the limit of the global ER (and temperatures) while maintaining stable combustion. Spectrometric measurements along the combustor showed that the fuel-rich pilot flame generates free radicals that augment combustion stability. In order to study the relevant mechanisms responsible for combustion stabilization, CHEMKIN simulations were performed. The developed chemical network model took into account some of the basic parameters of the combustion process: ER, residence time, and the distribution of the reactances along the combustor. The CHEMKIN simulations showed satisfactory agreement with experimental results.

scholarly journals Influence of Temperature on Free Radical Generation in Propolis-Containing Ointments

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Paweł Olczyk ◽  
Pawel Ramos ◽  
Katarzyna Komosinska-Vassev ◽  
Lukasz Mencner ◽  
Krystyna Olczyk ◽  
...  
Keyword(s):  
Free Radicals ◽  
Free Radical ◽  
Heating Temperature ◽  
Radical Formation ◽  
Paramagnetic Resonance ◽  
Influence Of Temperature ◽  
Spin Lattice ◽  
Influence Of Temperature On ◽  
Free Radical Formation ◽  
C 50

Free radicals thermally generated in the ointments containing propolis were studied by electron paramagnetic resonance (EPR) spectroscopy. The influence of temperature on the free radical concentration in the propolis ointments was examined. Two ointment samples with different contents of propolis (5 and 7%, resp.) heated at temperatures of 30°C, 40°C, 50°C, and 60°C, for 30 min., were tested. Homogeneously broadened EPR lines and fast spin-lattice interactions characterized all the tested samples. Free radicals concentrations in the propolis samples ranged from 1018 to 1020 spin/g and were found to grow in both propolis-containing ointments along with the increasing heating temperature. Free radical concentrations in the ointments containing 5% and 7% of propolis, respectively, heated at temperatures of 30°C, 40°C, and 50°C were only slightly different. Thermal treatment at the temperature of 60°C resulted in a considerably higher free radical formation in the sample containing 7% of propolis when related to the sample with 5% of that compound. The EPR examination indicated that the propolis ointments should not be stored at temperatures of 40°C, 50°C, and 60°C. Low free radical formation at the lowest tested temperatures pointed out that both examined propolis ointments may be safely stored up to the temperature of 30°C.

scholarly journals The Action of Oil-Related Environmental Pollutants on Male Reproductive System

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Sirotkin AV ◽  
Keyword(s):  
Free Radicals ◽  
Cell Apoptosis ◽  
Intracellular Signaling ◽  
Hormone Receptors ◽  
Environmental Pollutants ◽  
Male Reproduction ◽  
Testicular Cell ◽  
Signaling Systems ◽  
Low Weight ◽  
Benzene Toluene

The low-weight aromatic hydrocarbons benzene, toluene, ethylbenzene, m/p-xylene, and o-xylene (BTEX), are among the most common hazardous sources of environmental contamination. The present review is the first summarization the data obtained during epidemiological, animals and cell culture studies concerning BTEX action on different aspects of male reproductiontesticular cell apoptosis, spermatogenesis, cytogenetics, pituitary and peripheral hormones and intracellular signaling systems. Analysis of the available literature demonstrates that BTEX can exert hazardous effects on various reproductive sites, including the pituitary-gonadal axis, hormone receptors and intracellular signaling molecules, testicular cell apoptosis, spermatogenesis and fertility. There are indications, that BTEX reproductive effects could be due to the ability of BTEX to affect embryonal gonads, to induce testicular cell mutagenesis and destroy chromosomes, to promote accumulation of free radicals, to affect hormones and hormonal receptors, cell cycle and CNS structures regulating reproduction, but only the role of free radicals in mediating BTEX action on male reproduction has been proven by experiments yet. Some approaches to prevent negative action of BTEX are outlined.

Study of an organoclay for the sorption of dissolved organic compounds in the wastewaters from offshore platform operation

2009 ◽  
Vol 59 (8) ◽  
pp. 1495-1503 ◽  
Author(s):  
C. Scurtu ◽  
T. Leiknes ◽  
H. Helness
Keyword(s):  
Acetic Acid ◽  
Carboxylic Acids ◽  
Acid Concentration ◽  
Research Work ◽  
Sorption Process ◽  
Offshore Platform ◽  
Acetic Acid Concentration ◽  
Organically Modified ◽  
Benzene Toluene ◽  
Dissolved Organic Compounds

The goal of this research work was to find a sorbent able to selectively retain the harmful dissolved compounds in the wastewaters from offshore platform operation but not the carboxylic acids and to study the effects of the most important parameters on the sorption process. BTX compounds (benzene, toluene and p-xylene) and acetic acid were chosen as the representatives of the harmful compounds and carboxylic acids groups respectively since they are found in the highest concentrations. An organically modified clay was determined to be the most suitable sorbent, where performance was evaluated at different values of pH (3, 5 and 8), acetic acid concentration (0, 160 and 320 mg/l), salinity (0, 35 and 70 g/l) and temperature (20, 40 and 60°C). Results show that there is a sorption competition between BTX and acetic acid. Sorption of BTX compounds decreased with increasing initial acetic acid concentration and temperature, and increased proportionally with the salinity. Sorption of acetic acid, however, decreased with increasing pH, temperature and salinity.

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