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
Macroporous resin （D201）-supported quartemary ammonium bisulfate （D201-HSO4） was prepared and effectively used in catalyzing the hydrolysis of epoxides or aziridines under mild and non-metal conditions to give the...Macroporous resin （D201）-supported quartemary ammonium bisulfate （D201-HSO4） was prepared and effectively used in catalyzing the hydrolysis of epoxides or aziridines under mild and non-metal conditions to give the corresponding 1,2-diols and β-amino alcohols in high yields. The catalyst was facilely prepared and recyclable.展开更多
To gain insight into the fine interfacial control mechanism exhibited by oxidant-coated Al powder to improve combustion performance,we prepared Al/AP and Al@AP composite fuels using ball milling and spray-drying techn...To gain insight into the fine interfacial control mechanism exhibited by oxidant-coated Al powder to improve combustion performance,we prepared Al/AP and Al@AP composite fuels using ball milling and spray-drying technology.The thermal reaction characteristics,AP decomposition behavior,and decomposition reaction pathways of Al/AP and Al@AP composite fuels were investigated using thermal analysis and Ab Initio Molecular Dynamics(AIMD)calculations.Under the influence of fine interfacial control,the low-temperature decomposition heat release peak of AP was delayed by 25.5℃,while the high-temperature decomposition peak was advanced by 36.2℃,leading to an increase in the decomposition heat release of AP from 410.7 J/g to 1068.7 J/g.Compared to the unclad structure,the apparent activation energy of AP in low-temperature decomposition increased,and slightly decreased during high-temperature decomposition in the Al@AP composite fuel.The physical model of AP decomposition shifted to the model with higher degrees of freedom and a faster diffusion rate,characterized by rapid bidirectional diffusion at the interface.Furthermore,due to fine interfacial control,the oxidation reaction pathway of Al has been altered,changing from the final products of AP decomposition(O_(2),Cl2,etc.)to the direct oxidation of AP decomposition intermediates(HClO,ClO_(2),etc.).This accelerated and strengthened the oxidation reaction process of Al.As a result of these performance improvements,the final combustion temperature of Al@AP in the Microcanonical Ensemble(NVE)system stabilized at 2370 K,which is significantly higher than 1400 K observed for Al/AP,indicating enhanced ignition and combustion performance.展开更多
Thermal decomposition of a famous high oxidizer arnrnoniurn dinitrarnide （ADN） under high temperatures （2000 and 3000 K） was studied by using the ab initio molecular dynamics method. Two different ternperature-dep...Thermal decomposition of a famous high oxidizer arnrnoniurn dinitrarnide （ADN） under high temperatures （2000 and 3000 K） was studied by using the ab initio molecular dynamics method. Two different ternperature-dependent initial decomposition mechanisms were observed in the unirnolecular decomposition of ADN, which were the intrarnolecular hydrogen transfer and N-NO2 cleavage in N（NO2） . They were competitive at 2000 K, whereas the forrner one was predominant at 3000 K. As for the rnultimolecular decomposition of ADN, four different initial decomposition reactions that were also ternperature-dependent were observed. Apart from the aforernentioned rnechanisrns, another two new reactions were the interrnolecular hydrogen transfer and direct N-H cleavage in NH4＋. At the temperature of 2000 K, the N-NO2 cleavage competed with the rest three hydrogen-related decomposition reactions, while the direct N-H cleavage in NH4＋ was predominant at 3000 K. After the initial decomposition, it was found that the temperature increase could facilitate the decomposition of ADN, and would not change the key decomposition events. ADN decomposed into small molecules by hydrogen-prornoted simple, fast and direct chemical bonds cleavage without forrning any large intermediates that rnay impede the decomposition. The main decomposition products at 2000 and 3000 K were the same, which were NH3, NO2, NO, N2O, N2, H2O, and HNO2.展开更多
研究了聚磷酸铵APP、三聚氰胺氰尿酸盐MCA、乙酰丙酮锌以及ABS高胶粉对磷-氮复配无卤阻燃ABS材料的阻燃性能、力学性能及热学特性的影响。实验表明单独使用聚磷酸铵APP阻燃剂对ABS材料进行阻燃改性效果一般,阻燃等级无法达到V-0级别。将...研究了聚磷酸铵APP、三聚氰胺氰尿酸盐MCA、乙酰丙酮锌以及ABS高胶粉对磷-氮复配无卤阻燃ABS材料的阻燃性能、力学性能及热学特性的影响。实验表明单独使用聚磷酸铵APP阻燃剂对ABS材料进行阻燃改性效果一般,阻燃等级无法达到V-0级别。将APP与MCA复配使用后材料阻燃效果良好,能够达到1.6 mm V-0级别。在无卤阻燃ABS体系中添加部分ABS高胶粉能够改善阻燃ABS抗冲击性能不足的缺点,但会降低阻燃效果,添加部分乙酰丙酮锌能够将该影响消除,同时能提高阻燃ABS的抗冲击性能。展开更多
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.
文摘Macroporous resin （D201）-supported quartemary ammonium bisulfate （D201-HSO4） was prepared and effectively used in catalyzing the hydrolysis of epoxides or aziridines under mild and non-metal conditions to give the corresponding 1,2-diols and β-amino alcohols in high yields. The catalyst was facilely prepared and recyclable.
基金co-supported by the National Natural Science Foundation of China(Nos.52176099 and 52306130)the Applied Basic Research Project of Changzhou City,China(No.CJ20235033)the High-Performance Computation Laboratory of Hefei and Changzhou University,China.
文摘To gain insight into the fine interfacial control mechanism exhibited by oxidant-coated Al powder to improve combustion performance,we prepared Al/AP and Al@AP composite fuels using ball milling and spray-drying technology.The thermal reaction characteristics,AP decomposition behavior,and decomposition reaction pathways of Al/AP and Al@AP composite fuels were investigated using thermal analysis and Ab Initio Molecular Dynamics(AIMD)calculations.Under the influence of fine interfacial control,the low-temperature decomposition heat release peak of AP was delayed by 25.5℃,while the high-temperature decomposition peak was advanced by 36.2℃,leading to an increase in the decomposition heat release of AP from 410.7 J/g to 1068.7 J/g.Compared to the unclad structure,the apparent activation energy of AP in low-temperature decomposition increased,and slightly decreased during high-temperature decomposition in the Al@AP composite fuel.The physical model of AP decomposition shifted to the model with higher degrees of freedom and a faster diffusion rate,characterized by rapid bidirectional diffusion at the interface.Furthermore,due to fine interfacial control,the oxidation reaction pathway of Al has been altered,changing from the final products of AP decomposition(O_(2),Cl2,etc.)to the direct oxidation of AP decomposition intermediates(HClO,ClO_(2),etc.).This accelerated and strengthened the oxidation reaction process of Al.As a result of these performance improvements,the final combustion temperature of Al@AP in the Microcanonical Ensemble(NVE)system stabilized at 2370 K,which is significantly higher than 1400 K observed for Al/AP,indicating enhanced ignition and combustion performance.
基金supported by the Fundamental Research Funds for the Central Universities (No.30916011315)the Priority Academic Program Development of Jiangsu Higher Education Institutionsthe Fundamental Research Funds for the Central Universities (No.30916011317)
文摘Thermal decomposition of a famous high oxidizer arnrnoniurn dinitrarnide （ADN） under high temperatures （2000 and 3000 K） was studied by using the ab initio molecular dynamics method. Two different ternperature-dependent initial decomposition mechanisms were observed in the unirnolecular decomposition of ADN, which were the intrarnolecular hydrogen transfer and N-NO2 cleavage in N（NO2） . They were competitive at 2000 K, whereas the forrner one was predominant at 3000 K. As for the rnultimolecular decomposition of ADN, four different initial decomposition reactions that were also ternperature-dependent were observed. Apart from the aforernentioned rnechanisrns, another two new reactions were the interrnolecular hydrogen transfer and direct N-H cleavage in NH4＋. At the temperature of 2000 K, the N-NO2 cleavage competed with the rest three hydrogen-related decomposition reactions, while the direct N-H cleavage in NH4＋ was predominant at 3000 K. After the initial decomposition, it was found that the temperature increase could facilitate the decomposition of ADN, and would not change the key decomposition events. ADN decomposed into small molecules by hydrogen-prornoted simple, fast and direct chemical bonds cleavage without forrning any large intermediates that rnay impede the decomposition. The main decomposition products at 2000 and 3000 K were the same, which were NH3, NO2, NO, N2O, N2, H2O, and HNO2.
文摘研究了聚磷酸铵APP、三聚氰胺氰尿酸盐MCA、乙酰丙酮锌以及ABS高胶粉对磷-氮复配无卤阻燃ABS材料的阻燃性能、力学性能及热学特性的影响。实验表明单独使用聚磷酸铵APP阻燃剂对ABS材料进行阻燃改性效果一般,阻燃等级无法达到V-0级别。将APP与MCA复配使用后材料阻燃效果良好,能够达到1.6 mm V-0级别。在无卤阻燃ABS体系中添加部分ABS高胶粉能够改善阻燃ABS抗冲击性能不足的缺点,但会降低阻燃效果,添加部分乙酰丙酮锌能够将该影响消除,同时能提高阻燃ABS的抗冲击性能。
