On the basis of hydrodynamic and scaling-up studies, a pilot-plant-scale thermal spouted bed reactor (50 mm in ID and 1500 mm in height) was designed and fabricated by scaling-down cold simulators. It was tested for m...On the basis of hydrodynamic and scaling-up studies, a pilot-plant-scale thermal spouted bed reactor (50 mm in ID and 1500 mm in height) was designed and fabricated by scaling-down cold simulators. It was tested for making syngas via catalytic partial oxidation (CPO) of methane by air. The effects of various operating conditions such as operating pressure and temperature, feed composition, and gas flowrate etc. on the CPO process were investigated. CH4 conversion of 92.2% and selectivity of 92.3% and 83.3% to CO and H2, respectively, were achieved at the pressure of 2.1 MPa. It was found that when the spouted bed reactor was operated within the stable spouting flow regime, the temperature profiles along the bed axis were much more uniform than those operated within the fixed-bed regime. The CH4 conversion and syngas selectivity were found to be close to thermodynamic equilibrium limits. The results of the present investigation showed that spouted bed could be considered as a potential type of chemical reactor for the CPO process of methane.展开更多
An effective technology in controlling trihalomethanes （THMs） formation in the case of large amounts of bromide presenting was proposed, and the water of River Huang seriously polluted by bromide in winter in Tianji...An effective technology in controlling trihalomethanes （THMs） formation in the case of large amounts of bromide presenting was proposed, and the water of River Huang seriously polluted by bromide in winter in Tianjin City was studied. The THMs formation characteristics during prechloramination using preformed chloramines and converted chloramines were studied through jar tests. Results show that, in prechloramination process, the formation of THMs by preformed chloramines is very few, while that by converted ehloramines is a little higher. And the formation of THMs, especially Br^- substituted THMs, increases with the increase of time and Cl2：N ratio as well as the decrease of pH. The result obtained in a pilot plant shows that compared with prechlorination, the prechloramination process can efficiently control the formation of THMs, especially the Br^- substituted species. With equal chlorine dosage, the prechloramination can maintain a larger chlorine residue which offece, a larger CT value than prechlorination.展开更多
more and more people recognize the speed and level of development of a university depends not only on the level of the school of thought and teacher but also on the laboratory construction and management level. Over t...more and more people recognize the speed and level of development of a university depends not only on the level of the school of thought and teacher but also on the laboratory construction and management level. Over the years many famous scholars and experts from many aspects and multidimensional perspective discusses the role and importance of laboratory work and practice of education and teaching, practice shows that： the degree of awareness and attention to a university laboratory construction and practice teaching in a sense reflects the understanding of the university personnel training and higher education. In the past, ＂focus on the theory and lighten the practice,＂ the idea has far-reaching impact, now we want to change old ideas; this is because in today＇ s quality education, construction, laboratory and practical education reform teaching content and methods are a part of education reform. We attach great importance to the English school laboratory building. In the new campus, the school has invested heavily to build five advanced equipment, it is a leading English Autonomous Learning Center. Independent Learning Centre is to stimulate students ＇interest in learning, develop students＇ ability to multi-faceted, full use modern teaching equipment to improve English skills platform of independent centers of learning effect.展开更多
基金Supported by the Doctorate Discipline Foundation of the Ministry of Education of China(No.2000042053)& China National Petroleum Co
文摘On the basis of hydrodynamic and scaling-up studies, a pilot-plant-scale thermal spouted bed reactor (50 mm in ID and 1500 mm in height) was designed and fabricated by scaling-down cold simulators. It was tested for making syngas via catalytic partial oxidation (CPO) of methane by air. The effects of various operating conditions such as operating pressure and temperature, feed composition, and gas flowrate etc. on the CPO process were investigated. CH4 conversion of 92.2% and selectivity of 92.3% and 83.3% to CO and H2, respectively, were achieved at the pressure of 2.1 MPa. It was found that when the spouted bed reactor was operated within the stable spouting flow regime, the temperature profiles along the bed axis were much more uniform than those operated within the fixed-bed regime. The CH4 conversion and syngas selectivity were found to be close to thermodynamic equilibrium limits. The results of the present investigation showed that spouted bed could be considered as a potential type of chemical reactor for the CPO process of methane.
基金Sponsored by the National High Technology Research and Development Program of China(Grant No.2002AA601140)
文摘An effective technology in controlling trihalomethanes （THMs） formation in the case of large amounts of bromide presenting was proposed, and the water of River Huang seriously polluted by bromide in winter in Tianjin City was studied. The THMs formation characteristics during prechloramination using preformed chloramines and converted chloramines were studied through jar tests. Results show that, in prechloramination process, the formation of THMs by preformed chloramines is very few, while that by converted ehloramines is a little higher. And the formation of THMs, especially Br^- substituted THMs, increases with the increase of time and Cl2：N ratio as well as the decrease of pH. The result obtained in a pilot plant shows that compared with prechlorination, the prechloramination process can efficiently control the formation of THMs, especially the Br^- substituted species. With equal chlorine dosage, the prechloramination can maintain a larger chlorine residue which offece, a larger CT value than prechlorination.
文摘more and more people recognize the speed and level of development of a university depends not only on the level of the school of thought and teacher but also on the laboratory construction and management level. Over the years many famous scholars and experts from many aspects and multidimensional perspective discusses the role and importance of laboratory work and practice of education and teaching, practice shows that： the degree of awareness and attention to a university laboratory construction and practice teaching in a sense reflects the understanding of the university personnel training and higher education. In the past, ＂focus on the theory and lighten the practice,＂ the idea has far-reaching impact, now we want to change old ideas; this is because in today＇ s quality education, construction, laboratory and practical education reform teaching content and methods are a part of education reform. We attach great importance to the English school laboratory building. In the new campus, the school has invested heavily to build five advanced equipment, it is a leading English Autonomous Learning Center. Independent Learning Centre is to stimulate students ＇interest in learning, develop students＇ ability to multi-faceted, full use modern teaching equipment to improve English skills platform of independent centers of learning effect.
