Combinations of CHCL and СHCL with propane and chladones 125, 227ea as prospective noncombustible refrigerants

В данной работе рассмотрена проблема пожарной опасности применяемых в настоящее время хладагентов, предложено решение - создание негорючих смесевых композиций органических хлоридов с пропаном и хладонами 125, 227еа. Показана возможность увеличения доли короткоживущих компонентов в негорючих смесевых хладагентах, содержащих парниковые газы, с помощью создания тройных смесей. According to existing international agreements production of greenhouse gases must be drastically reduced in all sectors including refrigeration. It is known that refrigerants having short atmospheric lifetime are combustible. One of the methods to solve the problem of combustibility of refrigerants is to create noncombustible mixtures of combustible substance with an inhibitor of combustion. Such mixtures of organic chlorides with propane and CFH or CFH are investigated in this paper both theoretically and experimentally. Experimental equipment was specially adjusted to the combustion properties of the used chlorinated substances. It was obtained that CHCl и CНCl are strong inhibitors of combustion processes including self-inhibition of combustion of these substances themselves. Fluorinated hydrocarbons CFH and CFH are effective in suppression of combustion of dichloromethane and 1, 2-dichloroethane in air. As it follows from the obtained results, it is possible to reduce the content of the greenhouse component in the mixed refrigerant by 93% mass by creating noncombustible mixtures of dichlorides with CFH or CFH which are greenhouse gases. It was also revealed that CFH and CFH are stronger suppressants for combustion of CHCl and CНCl than for combustion of propane. Creation of triple noncombustible mixtures between CH, CHCl and CFH is advisable only when it is necessary to optimize energy efficiency of the refrigerant.

The Influence of Small Additives of Alcohol Vapors on Combustion of Hydrogen and Methane in Air

The results of investigation of combustion of hydrogen-air and methane-air mixtures in the presence of small additives of ethanol, isopropanol, propenol in horizontal tubes are presented. The additives reduce the upper limits of flame propagation and the rate of flame propagation. The difference of inhibiting efficiencies<br />of these alcohols corresponds to their ability to break the reaction chains of hydrogen and methane combustion processes. In the mixtures, containing less than 15% of hydrogen the suppression of combustion does not occur.