On a composition of combustion products at a burning of methane-fluorinated hydrocarbon mixtures in air

2020 ◽  
pp. 44-49
Author(s):  
Алексей Юрьевич Шебеко ◽  
Юрий Николаевич Шебеко
Keyword(s):  
Combustion Products ◽  
Hydrocarbon Mixtures ◽  
Gaseous Mixtures ◽  
Fire Extinguishing ◽  
Simplified Method ◽  
Room Volume ◽  
Composition Of Combustion Products ◽  
Fluorinated Hydrocarbons

Выполнена расчетная оценка равновесного состава продуктов горения околостехиометрических смесей вида метан - фторированный углеводород - воздух с использованием как программного комплекса Chemical Workbench, так и предложенной в настоящей работе упрощенной методики. Найдено, что основными продуктами горения являются CO, HO, CO, HF. При этом концентрации прочих продуктов горения имеют существенно более низкие значения. С помощью программного комплекса FDS выполнен расчет динамики концентраций опасных продуктов (СО, HF) в атмосфере модельного помещения объемом 12,6 м. Найдено, что для указанного помещения предельно допустимая концентрация CO достигается через 730 с после начала горения, а HF - практически мгновенно. Результаты работы могут быть полезны при применении фторированных углеводородов для пожаротушения и флегматизации горючих газовых смесей. Calculations of equilibrium compositions of combustion products at burning of near stoichiometric mixtures of methane-fluorinated hydrocarbon-air are presented. The program tool Chemical Workbench was used. Also a Simplified method was proposed. It was found that CO, HO, CO and HF are the main combustion products, and the concentration of other products are much more lower. The results of the calculations of the concentrations of the above mentioned products (CO, HO, CO and HF) by means of the simplified method are close to that obtained by the tool Chemical Workbench ones. The concentrations of CO and HF (the main hazardous products) as a function of time were determined for a typical room volume of 12, 6 m using the program tool FDS 6. It was found that a limiting allowable concentration of CO was reached after 730 s from the burning beginning, but at the case of HF this concentration was reached almost instantaneously. The results of this study can be used at an application of the fluorinated hydrocarbons for fire extinguishing and inertization of flammable gaseous mixtures.

scholarly journals Assessment of threat arising by closed - volume explosions of fuel - air mixtures

2021 ◽  
pp. 1-11
Author(s):  
Andrzej PAPLIŃSKI
Keyword(s):  
Combustion Products ◽  
Numerical Code ◽  
Closed Volume ◽  
Closed Space ◽  
Empirical Methods ◽  
Flammability Limits ◽  
Reactive Medium ◽  
Gaseous Mixtures ◽  
Semi Empirical ◽  
Composition Of Combustion Products

The method of estimation of maximal parameters of combustion of gaseous mixtures in closed space is presented. Estimation of chemical composition of combustion products is based on simplified rules of decomposition of reactive medium. Exemplary calculations of temperature, pressure, heat of combustion of hydrocarbon/air mixtures are presented. The accuracy of presented method was validated by comparison with calculations performed by thermodynamic numerical code that include wide list of chemical substances present in combustion products. The obtained results confirm applicability of the proposed method to predict closed space combustion parameters of gaseous mixtures. Semi-empirical methods of estimation of flammability limits are briefly referred

Simplified Version of the Ampoule–Persulfate Method for Determination of Dissolved Organic Carbon

1987 ◽  
Vol 44 (1) ◽  
pp. 214-218 ◽  
Author(s):  
William H. McDowell ◽  
Jonathan J. Cole ◽  
Charles T. Driscoll
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Automated Analysis ◽  
Combustion Products ◽  
Technical Grade ◽  
Digestion Procedure ◽  
Wet Digestion ◽  
Simplified Method ◽  
Continuous Stream

A simplified method for the determination of dissolved organic carbon is based upon the ampoule–persulfate wet digestion procedure. The modification proposed involves use of a continuous stream of sparging gas (technical grade oxygen) during the ampoule sealing process to minimize entry of combustion products from the sealing flame. The method provides reliable results with a minimum of training and equipment compared with other methods of sealing ampoules. Further, the proposed method is inexpensive, relatively simple, and compares favorably with costly, automated analysis of dissolved organic carbon.

scholarly journals An innovative approach to the elimination of combustion foci at MSW landfills (on the example of the Rostov region)

2021 ◽  
Vol 273 ◽  
pp. 04006
Author(s):  
Oleg Denisov ◽  
Elena Andreeva
Keyword(s):  
Combustion Products ◽  
Municipal Waste ◽  
Innovative Approach ◽  
Household Waste ◽  
Surface Fires ◽  
Fire Extinguishing ◽  
Rostov Region ◽  
Solid Municipal Waste ◽  
Deep Layers ◽  
Consumption Waste

The article is devoted to the search for an innovative approach to the elimination of combustion foci at solid municipal waste landfills. In connection with the increase in the number of solid municipal waste landfills near settlements, a number of geoecological problems are increasing. One of the most complex geoecological problems arising in connection with the operation of solid municipal waste landfills is the problem of the genesis and development of surface fires in the layer of household waste. At the same time, concern is caused not only by the actual dangerous factors of the spread of fire, but also by the subsequent significant pollution of the surface layer with air by combustion products, including those of a carcinogenic or mutagenic nature. To achieve this goal, the article describes an innovative approach to eliminating combustion foci at solid municipal waste landfills: an innovative device developed by the authors of the study - a mechanical fire hydrant for wetting burning deep layers of consumption waste with a fire-extinguishing liquid.

scholarly journals Modeling of the mechanism of heterogeneous inhibition of the active flame centers of a jet burning system by fire extinguishing powder particles

2021 ◽  
Vol 66 (2) ◽  
pp. 250-256
Author(s):  
A. I. Kitsak
Keyword(s):  
Convective Motion ◽  
Combustion Products ◽  
Convective Transport ◽  
Fire Extinguishing ◽  
Hazardous Chemical ◽  
Active Particles ◽  
Molecular Transfer ◽  
Flame Suppression ◽  
Powder Particles ◽  
Kinetics Of

The relevance of the work is due to the lack of a physical interpretation of the process of extinguishing jet burning systems with fire extinguishing powders, which is important for ensuring effective fire extinguishing at gas and oil complexes and hazardous chemical industries. A mathematical model of the reaction kinetics of heterogeneous inhibition of active flame centers of a jet burning system by fire extinguishing powder particles in an unsteady mode is considered in the approximation of a purely molecular transfer of matter in the reaction zone. The regularities of the mechanism of heterogeneous inhibition of the active flame centers by the particles of the extinguishing powder under conditions when the active particles of the combustion products participate not only in diffuse, but also in convective transport are established. It is shown, that the convective motion of the active flame centers increases the reaction rate of heterogeneous inhibition of their particles of the extinguishing agent. The results obtained allow us to optimize the conditions for the supply of fire extinguishing powder to the jet burning medium for effective flame suppression.

Determination of zero components in the composition of a system

1986 ◽  
Vol 51 (6) ◽  
pp. 1206-1212 ◽  
Author(s):  
Oldřich Coufal
Keyword(s):  
Equilibrium Composition ◽  
Combustion Products ◽  
Entire System ◽  
Chemically Reacting ◽  
Theoretical Considerations ◽  
Composition Of Combustion Products

A method is proposed for determing components whose concentration in a system of chemically reacting components is zero without necessity of computing the composition of the entire system. Theoretical considerations are applied to the case of the equilibrium composition of combustion products of hydrocarbons with air and an ionization additive, K2CO3.

scholarly journals Determination of training conditions of fire-fighters in mobile training complexes

2018 ◽  
Vol 247 ◽  
pp. 00021
Author(s):  
Vasyl Lusch ◽  
Vasyl Loik ◽  
Oleksandr Lazarenko ◽  
Mirosław Kosiorek
Keyword(s):  
Room Temperature ◽  
Material Balance ◽  
Combustion Products ◽  
Maximum Temperature ◽  
Fire Fighters ◽  
Training Systems ◽  
Problematic Issue ◽  
Composition Of Combustion Products ◽  
Percentage Ratio

The conditions created during training of firefighters in the mobile training complex of the Polish company «Egeria group» are considered. Currently, the determination of the parameters of the gas environment created by the combustion of pure propane (C3H8), vaseline oil and nitrogen oxide (N2O) over a period of time remains a problematic issue. At the same time, the conditions, which are created when combustion in such cameras, namely, the approximate temperature, the composition of combustion products, their volume during training in mobile training systems remain unexplored. The determination of the amount of combustion products was carried out by solving the equations for determining the material balance of the process of combustion of propane at the maximum temperature created by the mobile training complex and room temperature. As the calculations performed in the mobile training complex during the burning of propane to obtain a high temperature, the oxygen concentration in the air will remain safe - 20.16%. This will gradually increase the content of СО2, N2 and H2O vapour, since the composition of the products of combustion in the percentage ratio will be: СО2 = 11.63%; H2O = 15.5%; N2 = 72.87%.

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