| Light hydrocarbon air-mixed gas is a new type of gas,which is made up of gaseous light hydrocarbon and air.It plays an increasingly important role in today's energy shortage.Because of its flammable and explosive nature,in order to prevent the occurrence of deflagration accidents,it is necessary to install flame retardants in the process of preparation and use.In order to determine the optimum gas composition of light hydrocarbon air-mixed gas,different preparation methods of mixed gas were compared and analyzed.Finally,gasification before mixing was used for experiment.The calorific value and dew point of light hydrocarbon mixed air gas at different ratios were measured and counted,and compared with natural gas.The results show that the calorific value and dew point of light hydrocarbon mixed air gas can be maintained within a reasonable range when the mixing ratio of light hydrocarbon mixed air gas is between 1:3 and 1:4.In this case,the mixed gas can not only ensure the normal use of flame retardants,but also meet the needs of industrial production.The geometric model of honeycomb hexagonal flame arrester is established according to the properties of light hydrocarbon air-mixed gas and flame propagation conditions,and the grid independence is analyzed.The combustion and quenching performances of the above-mentioned mixed gas were simulated in a honeycomb hexagonal flame retardant channel with 1 mm cross-section and 60 mm fire-retardant thickness by using Fluent software.The temperature and concentration fields of the flame-retardant channel were studied under three kinds of flame velocities of 10 m/s,30 m/s and 50 m/s.The conclusion was drawn that the flame temperature decreased with the increase of the propagation distance,and the reactants and the quenching performances of the flame-retardant channel were also studied.The change trend of products is basically the same as that of temperature.With the increase of distance,the number of reactants increases and the number of products decreases.On the other hand,the ability of flame quenching of flame arrester will be weakened with the increase of channel diameter and wall temperature.In addition,the propagation process of premixed gas in the flame-retardant channel model after ignition without continuous energy input is simulated,and the quenching time is about 0.5 ms.In this paper,the manufacture of light hydrocarbon air-mixed gas and its propagation and quenching in honeycomb hexagonal flame retardant have been studied by experiment and numerical simulation.It has certain reference value for the design of fire retardant and the manufacture of light hydrocarbon air-mixed gas in the future. |
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