In order to improve the cold start performance of heavy duty diesel engine, electronically controlling the preheating of intake air by flame was researched. According to simulation and thermodynamic analysis about th...In order to improve the cold start performance of heavy duty diesel engine, electronically controlling the preheating of intake air by flame was researched. According to simulation and thermodynamic analysis about the partial working processes of the diesel engine, the amount of heat energy, enough to make the fuel self ignite at the end of compression process at different temperatures of coolant and intake air, was calculated. Several HY20 preheating plugs were used to heat up the intake air. Meanwhile, an electronic control system based on 8 bit micro controller unit (MCS 8031) was designed to automatically control the process of heating intake air. According to the various temperatures of coolant and ambient air, one plug or two plugs can automatically be selected to heat intake air. The demo experiment validated that the total system could operate successfully and achieve the scheduled function.展开更多
In this paper the premixed catalytic combustion emissions such as CO, unburned hydrocarbon (UHC), NOx and the temperature distribution in the catalytic monolith with ultra low concentration of Pd were studied. Three t...In this paper the premixed catalytic combustion emissions such as CO, unburned hydrocarbon (UHC), NOx and the temperature distribution in the catalytic monolith with ultra low concentration of Pd were studied. Three types of monoliths were used for experiments and the temperature of preheated air was respectively 50℃ , 100℃ and 200℃ . The results showed that preheated air made radial temperature in the catalytic monolith uniform which helped to avoid local hot spots so as to decrease NOx emission. The experiment also proved that the shorter monolith showed much better catalytic combustion performance than longer one and the temperature at the exit of the shorter monolith was relatively lower. On the contrary, the temperature was higher in the longer monolith and the lethal NOx emission was slightly increased.展开更多
Ammonium bisulfate(ABS)is a viscous compound produced by the escape NH_(3) in the NO reduction process and SO_(3) in the flue gas at a certain temperature,which can cause the ash corrosion of the air preheater in coal...Ammonium bisulfate(ABS)is a viscous compound produced by the escape NH_(3) in the NO reduction process and SO_(3) in the flue gas at a certain temperature,which can cause the ash corrosion of the air preheater in coal-fired power plants.Therefore,it is essential to study the formation temperature of ABS to prevent the deposition of ABS in air preheaters.In this paper,the SO_(3) reaction kinetic model is used to analyze the SO_(3) generation process from coal combustion to the selective catalytic reduction(SCR)exit stage,and the kinetic model of NO reduction is used to analyze the NH_(3) escape process.A prediction model for calculating the ABS formation temperature based on the S content in coal and NO reduction parameters of the SCR is proposed,solving the difficulty of measuring SO_(3) concentration and NH_(3) concentration in the previous calculation equation of ABS formation temperature.And the reliability of the model is verified by the actual data of the power plant.Then the influence of S content in coal,NH_(3)/NO_(x) molar ratio,different NO_(x) concentrations at SCR inlet,and NO removal efficiency on the formation temperature of ABS are analyzed.展开更多
这数字研究调查使用冲淡的燃料的效果(在在常规燃烧(有在 300 和 1273 K 的21% O <sub>2</sub>的空气)和高度预热并且冲淡的空气的几个案例下面的一个工业炉子的50%天然气和50% N <sub>2</sub>)(有10% O <s...这数字研究调查使用冲淡的燃料的效果(在在常规燃烧(有在 300 和 1273 K 的21% O <sub>2</sub>的空气)和高度预热并且冲淡的空气的几个案例下面的一个工业炉子的50%天然气和50% N <sub>2</sub>)(有10% O <sub>2</sub>的 1273 K 并且用一台内部计算机的90% N <sub>2</sub>)燃烧( HPDAC )条件编程序。由使用联合冲淡的燃料和氧化剂而不是他们的自由或未经冲淡的状态，最好的条件为 HPDAC 的主要唯一的特征的建立被获得，这被发现。这些特征是低吝啬、最大的煤气的温度和高放射 / 总数热转移到气体和试管；象他们的更多的一致性一样，导致的分布在没有 <sub 减少 > 在炉子效率或精力节省的 x </sub> 污染物质形成和增加。而且，许多化学火焰形状，过程液体和试管围温度侧面，要求的改革者效率并且最后，集中和速度模式有也是学习的品质上 / 份量上。展开更多
文摘In order to improve the cold start performance of heavy duty diesel engine, electronically controlling the preheating of intake air by flame was researched. According to simulation and thermodynamic analysis about the partial working processes of the diesel engine, the amount of heat energy, enough to make the fuel self ignite at the end of compression process at different temperatures of coolant and intake air, was calculated. Several HY20 preheating plugs were used to heat up the intake air. Meanwhile, an electronic control system based on 8 bit micro controller unit (MCS 8031) was designed to automatically control the process of heating intake air. According to the various temperatures of coolant and ambient air, one plug or two plugs can automatically be selected to heat intake air. The demo experiment validated that the total system could operate successfully and achieve the scheduled function.
基金Supported by the Key Project of the National 973 Program of China (No.2005CB724201)the Natural Science Foundation ofBeijing (No.06C0002)the Beijing Education Commission Key Laboratory of Heat Transfer and Energy Conversion Fund(No.05005790200406).
文摘In this paper the premixed catalytic combustion emissions such as CO, unburned hydrocarbon (UHC), NOx and the temperature distribution in the catalytic monolith with ultra low concentration of Pd were studied. Three types of monoliths were used for experiments and the temperature of preheated air was respectively 50℃ , 100℃ and 200℃ . The results showed that preheated air made radial temperature in the catalytic monolith uniform which helped to avoid local hot spots so as to decrease NOx emission. The experiment also proved that the shorter monolith showed much better catalytic combustion performance than longer one and the temperature at the exit of the shorter monolith was relatively lower. On the contrary, the temperature was higher in the longer monolith and the lethal NOx emission was slightly increased.
基金the Key Research and Development Plan of Shandong Province (2019GSF109004)Natural Science Foundation of Shandong Province (ZR2020ME190) for funding and supporting this work
文摘Ammonium bisulfate(ABS)is a viscous compound produced by the escape NH_(3) in the NO reduction process and SO_(3) in the flue gas at a certain temperature,which can cause the ash corrosion of the air preheater in coal-fired power plants.Therefore,it is essential to study the formation temperature of ABS to prevent the deposition of ABS in air preheaters.In this paper,the SO_(3) reaction kinetic model is used to analyze the SO_(3) generation process from coal combustion to the selective catalytic reduction(SCR)exit stage,and the kinetic model of NO reduction is used to analyze the NH_(3) escape process.A prediction model for calculating the ABS formation temperature based on the S content in coal and NO reduction parameters of the SCR is proposed,solving the difficulty of measuring SO_(3) concentration and NH_(3) concentration in the previous calculation equation of ABS formation temperature.And the reliability of the model is verified by the actual data of the power plant.Then the influence of S content in coal,NH_(3)/NO_(x) molar ratio,different NO_(x) concentrations at SCR inlet,and NO removal efficiency on the formation temperature of ABS are analyzed.
基金Supported by the National Iranian Oil Company (NIOC)
文摘这数字研究调查使用冲淡的燃料的效果(在在常规燃烧(有在 300 和 1273 K 的21% O <sub>2</sub>的空气)和高度预热并且冲淡的空气的几个案例下面的一个工业炉子的50%天然气和50% N <sub>2</sub>)(有10% O <sub>2</sub>的 1273 K 并且用一台内部计算机的90% N <sub>2</sub>)燃烧( HPDAC )条件编程序。由使用联合冲淡的燃料和氧化剂而不是他们的自由或未经冲淡的状态，最好的条件为 HPDAC 的主要唯一的特征的建立被获得，这被发现。这些特征是低吝啬、最大的煤气的温度和高放射 / 总数热转移到气体和试管；象他们的更多的一致性一样，导致的分布在没有 <sub 减少 > 在炉子效率或精力节省的 x </sub> 污染物质形成和增加。而且，许多化学火焰形状，过程液体和试管围温度侧面，要求的改革者效率并且最后，集中和速度模式有也是学习的品质上 / 份量上。
