| Explosion-proof diesel engine has been widely used in mine power equipment because of its high efficiency and safety.However,its combustion and emission characteristics have been greatly affected by the explosion-proof components installed on it,which has caused great harm to the health of miners.High cetane number,nearly negligible sulfur,and aromatic hydrocarbons are characteristics of F-T diesel.A fuel made from renewable biomass with a high energy density is n-butanol.Applying it to explosion-proof diesel engines can improve combustion and reduce pollutant emissions.The exhaust gas treatment tank is an important part of the mine diesel exhaust system.The exhaust gas discharged from the diesel engine enters the exhaust gas treatment tank through the diversion pipe,and the internal liquid cooling water is used to purify and cool the exhaust gas,so as to reduce the emission and meet the underground safety explosion-proof conditions.The explosion-proof diesel engine’s efficiency and emission characteristics,however,will also be impacted by the exhaust gas treatment tank.In this paper,ISDe 180-30 explosion-proof diesel engine was used as testing machine,and the influence of the exhaust gas treatment tank.on the economic performance and emission performance of explosion-proof diesel engine burning 0# diesel,F-T diesel,F-T diesel/n-butanol mixed fuel was tested and analyzed by bench test.The fluid in the exhaust gas treatment tank’s flow and temperature properties,including exhaust velocity,exhaust temperature,and bubble changes,were simulated and analyzed using FLUENT software.Through the method of experiment and simulation,the exhaust gas treatment tank is studied and analyzed comprehensively.The experimental findings demonstrate that: the exhaust gas treatment tank’s specific fuel consumption at high water level under full operating condition is higher than it is at low water level,and its effective thermal efficiency,CO emission,HC emission,and particulate emission are all lower than they are at low water level.At small load,NO discharge of high water level is greater than that of low water level.Under heavy load,NO discharge of high water level is less than that of low water level.Under full operating condition,specific fuel consumption of FT100,D100 and BU20 increased successively,while HC emission increased successively.The CO emission of D100,FT100 and BU20 decreased successively,and the concentration of particulate matter emission decreased successively.When the load is small,the effective thermal efficiency of FT100,D100 and BU20 decreases successively,while the NO emission of D100,FT100 and BU20 decreases successively.When the load is large,the thermal efficiency and NO emission of BU20 are the highest.The simulation findings demonstrate that: the simulation temperature and the experimental temperature follow the same rule when compared to the experimental results;the average error is 7.01%;the minimal error is just 0.07%;and the exhaust gas treatment tank.model satisfies the research requirements.After increasing the water level of the exhaust gas treatment tank,the maximum velocity growth rate of the exhaust gas treatment tank was21.86%,26.03%,32.00%,42.02% and 70.56%,respectively.The number of bubbles produced increased significantly,the uniformity of bubbles decreased,and the overall gas phase volume fraction decreased.The growth rate of the total bubble area was 122.83%,92.08%,83.99%,95.83% and 57.63%,respectively.The average temperature in the exhaust gas treatment tank decreased by 0.89%,1.41%,1.02%,3.17% and 5.12%.The drop of outlet temperature is 7.75%,13.08%,17.93%,21.47% and 20.13% respectively.The cooling efficiency of exhaust gas treatment tank is about 84%.At high water level,the heat and mass exchange between high-temperature exhaust gas and cooling water is more obvious,but the gas flow is unstable,the outlet temperature is greatly affected by eddy current,the temperature change range is wide,and the cooling water loss increases. |
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