An accurate and complete geometric model was constructed to simulate the combustion, flow and temperature environment in the radiant section of the steam cracking furnace. Simulation of flow and radiation status has u...An accurate and complete geometric model was constructed to simulate the combustion, flow and temperature environment in the radiant section of the steam cracking furnace. Simulation of flow and radiation status has utilized the standard k-ε model and P1 model. The finite-rate/eddy-dissipation (finite-rate/ED) combustion model and non-premixed combustion model were both used to simulate accurately the combustion and the operation status of the steam cracking furnace. Three different surfaces of the steam cracking furnace were obtained from the simulation, namely:the flue gas temperature field of the entrance surface in long flame burners, the central surface location of tubes, and the crossover section surface. Detailed information on the flue gas temperature and the mass concentration fraction of these different surfaces in the steam cracking furnace can also be obtained by the simulation. This paper analyzed and compared the simulation results with the two combustion models, estimated the operation status of the steam cracking furnace, and reported that the finite-rate/ED model is appropriate to simulate the steam cracking furnace by comparing key simulation data with actual test data. This work has also provided a theoretical basis for simulating and operating the steam cracking furnace.展开更多
This paper put forward an evaluation model with which one can make a comprehensive calculation of enterprise operation status concerning profit ability, repaying capability, economic efficiency and developing potentia...This paper put forward an evaluation model with which one can make a comprehensive calculation of enterprise operation status concerning profit ability, repaying capability, economic efficiency and developing potential; and meanwhile the method of maximal distinction is employed to conduct the data synthesis of several targets and draw the conclusion of evaluation. Finally, a pratical illustration is given in this paper.展开更多
The value of social security funds, has always been an important part of our country social security enterprise as a whole, it is the one of the main ways to realize the social stability and national economic income. ...The value of social security funds, has always been an important part of our country social security enterprise as a whole, it is the one of the main ways to realize the social stability and national economic income. In the triple pressure with ageing population, inflation and social security transition, the value of the social security fund in our country is particularly acute. Analyses the receipts and expenditures of social security funds, investment and operation structure and put forward some rationalization proposal, which has significant meaning for a better play to the role of the social security fund and actively promote the innovation and development of China＇s social security fund management.展开更多
基金supported by the technology development fund of China Petroleum & Chemical Corporation (Sinopec 409045)
文摘An accurate and complete geometric model was constructed to simulate the combustion, flow and temperature environment in the radiant section of the steam cracking furnace. Simulation of flow and radiation status has utilized the standard k-ε model and P1 model. The finite-rate/eddy-dissipation (finite-rate/ED) combustion model and non-premixed combustion model were both used to simulate accurately the combustion and the operation status of the steam cracking furnace. Three different surfaces of the steam cracking furnace were obtained from the simulation, namely:the flue gas temperature field of the entrance surface in long flame burners, the central surface location of tubes, and the crossover section surface. Detailed information on the flue gas temperature and the mass concentration fraction of these different surfaces in the steam cracking furnace can also be obtained by the simulation. This paper analyzed and compared the simulation results with the two combustion models, estimated the operation status of the steam cracking furnace, and reported that the finite-rate/ED model is appropriate to simulate the steam cracking furnace by comparing key simulation data with actual test data. This work has also provided a theoretical basis for simulating and operating the steam cracking furnace.
文摘This paper put forward an evaluation model with which one can make a comprehensive calculation of enterprise operation status concerning profit ability, repaying capability, economic efficiency and developing potential; and meanwhile the method of maximal distinction is employed to conduct the data synthesis of several targets and draw the conclusion of evaluation. Finally, a pratical illustration is given in this paper.
文摘The value of social security funds, has always been an important part of our country social security enterprise as a whole, it is the one of the main ways to realize the social stability and national economic income. In the triple pressure with ageing population, inflation and social security transition, the value of the social security fund in our country is particularly acute. Analyses the receipts and expenditures of social security funds, investment and operation structure and put forward some rationalization proposal, which has significant meaning for a better play to the role of the social security fund and actively promote the innovation and development of China＇s social security fund management.
