| Mine diesel engine which is also called explosion-proof diesel engine is a kind of engine which is installed in the ordinary diesel exhaust system with with water jacket manifold,with water jacket exhaust pipe,exhaust gas treatment box,exhaust flame arrester and other explosion-proof devices,among which the exhaust flame arrester and exhaust gas treatment box are the key devices which ensure that the mine diesel engine has a good explosion-proof performance whose have a direct impact on the explosion-proof diesel engine power and economy.So the study on structure of the exhaust flame arrester and exhaust gas treatment box is of great theoretical and engineering value.Exhaust flame arrester,exhaust gas treatment box,exhaust system of 6100 explosion-proof diesel engine lie some problems that Exhaust flame arrester is easy to plug and its exhaust resistance is too large,the exhaust gas treatment box is too big and its exhaust resistance is too big,and exhaust system noise is too big.For the problems addressed above a study is carried out.The influence of the partial structure of the flat flame arrester on the fire resistance and pressure loss was studied.A cooling-acoustic reduction integrated spray-typed exhaust gas treatment device is designed.The main work and conclusions are as follows:(1)FLUENT software was used to simulate the flame quenching and gas flow of the flat flame arrester.Plate gap,the thickness of the flame layer and the diameter of the expansion chamber on the fire resistance and pressure loss of the flat flame arrester were studied.The results show that the thickness of the flame-proof layer is 50 mm,the plate gap size is 0.25 mm,and the diameter of the expansion chamber is 2.5~3 times of the inlet diameter when the gas flow and fire resistance of the plate flame arrester are the best.(2)The FLUENT software was used to simulate the three-dimensional flow field of the bath-typed exhaust gas treatment box.The FLUENT+Virtual.Lab Acoustics method was used to analyze the acoustic characteristics of the bath-typed exhaust gas treatment box when the temperature field was present.The results show that the bath-typed exhaust gas treatment box has a good cooling ability and muffler effect,especially for the low frequency range silencer.But the pressure loss is big.(3)Based on the designing principle of reactive muffler,a cooling-acoustic reduction integrated spray-typed exhaust gas treatment device was designed.FLUENT is used to simulate the internal heat transfer field of the spray-typed exhaust gas treatment device.The results show that when the nozzle of the spray-typed exhaust gas treatment device is arranged with 8 nozzles and the inner tube is 282 mm,the cooling capacity meets the requirements and the pressure loss is only 1/5 of the pressure loss of the bath-typed exhaust gas treatment box.(4)Using the Virtual.Lab Acoustics to simulate the acoustic pressure distribution of the spray-typed exhaust gas treatment device when the internal fluid is still and the flow rate is 40m/s;FLUENT+Virtual.Lab Acoustics was used to analyze the acoustic pressure distribution of the spray-typed exhaust gas treatment device with a temperature gradient effect and to study its acoustic reduction performance.The results show that the spray-typed exhaust gas treatment device has good acoustic reduction performance and the existence of fluid flow within the system almost has no impact on its ability to eliminate noise;Spray-typed exhaust gas treatment device improves its acoustic reduction capacity in the frequency band within the existence of temperature gradient and the average transmission loss is about 2.5 times the bath-typed exhaust gas treatment box,the overall noise reduction ability is better. |
PDF Full Text Request