Web based production process monitoring and management system for oil refinery

This paper presents a Web based monitoring and management system for production process of oil refinery including system modeling, system components and functions, system framework, the adopted key technologies and application scenarios of the system. The system consists of data collecting and processing sub-system, technology analysis and management sub-system, store and transport management sub-system, system scheme optimize sub-system, production scheduling sub-system, and integrated information query sub-system. The system is developed in JSP, Servlet, JavaBean, XML and OWC. The system is running in an integrated environment of enterprise. It needs the requirements of monitoring and management for production process of oil refinery

Fault diagnosis and positioning method of robot RV speed reduction device

本发明涉及一种机器人RV减速器故障诊断和定位方法，具体的说是基于信号自适应拆分的机器人RV减速器故障诊断与定位方法。本发明包括以下步骤：获取声发射信号；自适应拆分声发射信号；对信号进行初始的频域变换；采用递归神经网络作为训练模型，对拆分及处理后的信号进行训练；对新获取的信号进行判断，并结合角度数据对故障点进行定位。本发明在充分考虑机器人用RV减速器运行机理的基础上提出的，能够准确快速的诊断相应的故障，提高机器人维护效率，降低运营成本

effectsofsteamtreatmentonacidityofzsm5anditscatalyticperformanceinbutenecracking

Propylene is one of the fastest growing petrochemicals, driven primarily by the high growth rate of polypropylene. The traditional methods to produce propylene cannot satisfy its demand. To increase the production of propylene, the catalytic cracking of low value C4+ hydrocarbons, by-products of petrochemical industry, to propylene and ethylene was investigated. The ZSM-5 zeolite was modified by steam treatment at different temperatures and for different time, and its acidity was measured by NH3-TPD technique. With increasing treatment temperature and time, the acid density and the acid strength of ZSM-5 decreased. When used as a catalyst for butene cracking, the ZSM-5 with low acid density and weak acid strength was favorable to enhance the yield of propylene plus ethylene, besides decreased the production of aromatics and low carbon paraffins. By leaching out the non-skeletal Al produced by the steam treatment with citric acid, the pore volume of ZSM-5 was enlarged and had a better capacity of accommodating the carbon deposit so that the catalyst life was prolonged. The yield of propylene plus ethylene could be enhanced if the reaction conditions were properly selected, as well as the yield of aromatics and paraffins could be decreased. The optimum conditions were as follows: WHSV = 3.5similar to8.8 h(-1), p = 0.06similar to0.1 MPa and theta = 600similar to620 degreesC

effectsofsteamtreatmentonacidityofzsm5anditscatalyticperformanceinbutenecracking

Propylene is one of the fastest growing petrochemicals, driven primarily by the high growth rate of polypropylene. The traditional methods to produce propylene cannot satisfy its demand. To increase the production of propylene, the catalytic cracking of low value C4+ hydrocarbons, by-products of petrochemical industry, to propylene and ethylene was investigated. The ZSM-5 zeolite was modified by steam treatment at different temperatures and for different time, and its acidity was measured by NH3-TPD technique. With increasing treatment temperature and time, the acid density and the acid strength of ZSM-5 decreased. When used as a catalyst for butene cracking, the ZSM-5 with low acid density and weak acid strength was favorable to enhance the yield of propylene plus ethylene, besides decreased the production of aromatics and low carbon paraffins. By leaching out the non-skeletal Al produced by the steam treatment with citric acid, the pore volume of ZSM-5 was enlarged and had a better capacity of accommodating the carbon deposit so that the catalyst life was prolonged. The yield of propylene plus ethylene could be enhanced if the reaction conditions were properly selected, as well as the yield of aromatics and paraffins could be decreased. The optimum conditions were as follows: WHSV = 3.5similar to8.8 h(-1), p = 0.06similar to0.1 MPa and theta = 600similar to620 degreesC