Advanced Materials Research Vols. 219-220

Abstract: In this paper, a coke dry quenching gasification (CDQG) technology using coke oven gas (COG) and steam to quench the incandescent coke is proposed. The distinct advantages of this technology include energy conservation, pollution reduction, and improvement of coke quality and full use of resources. Based on Gibbs free energy minimization principle, the flow rate and composition of the syngas could be calculated. At the same time, the impact of the flow rate of the COG on the flow rate and composition of the syngas and the exergy efficiency are analyzed. Finally, the flow rate of the COG is prudently chosen to make thermodynamic analysis of the process.

Abstract: In this paper, an energy-efficient heat coupled distillation column (HCDC) which is industrially viable is constructed for propylene–propane mixture separation and the sensitivity analysis was performed. Some comparative studies are made with conventional distillation column (CC) and a column with a vapor recompression system (VRC). The results show that the thermal efficiency of the HCDC appears to be strongly sensitive to the compression ratio between rectification section and stripping section.

Abstract: Although the grey forecasting model has been successfully adopted in various fields and has been demonstrated prospected aspect. The paper makes the original data multiply the time interval to get the accumulated sequence and uses the difference quotient method to establish the unequal interval GM(1,1) model. In order to reduce the error the paper adopts the weighted coefficient to revise the background values. By fitting and predicting the fatigue strength data it proves the method in the paper is effective which improves the accuracy of the model. It provides an effective way for the grey system application.

Abstract: Although the GM(1,1) model has been successfully adopted in various fields and has been demonstrated promising prospect. The paper adopts different form of grey model which is a supplement of the grey model and we call it GIM(1) model. On the analyzing the unequal GM(1,1) model the paper uses the difference quotient method to establish the unequal interval GIM(1) model. The examples prove the method in the paper is effective which improves the accuracy of the grey model. It provides an effective way for the grey system application.

Abstract: As an expendable profiler in marine environment, XCP (Expendable Current Profiler) is mainly to measure current speed, direction and temperature. The paper is to research dynamic sinking data transmission technique for XCP. Data transmission medium is a varnished wire with diameter of 0.1mm, length of 1,800m and two parallel wires. Transmission characteristics of varnished wires can be tested by experiment and computation. The paper is to research and design a kind of base band transmission system and analyze its characteristics and performance. By utilizing digital base band signaling transmission technique, indoor and marine testing results show that designed data transmission system can reach 1,800m on varnished wires with diameter of 0.1mm if XCP probe sinks dynamically by speed of 4m/s and transmission speed is 2,400bps.

Abstract: A plow surface-soil system dynamic simulation model was established, through MathCAD and ANSYS/LS-DYNA, on which the dynamic simulation tests were carried out by experimental design method. The discipline and mechanism about forming parameters of guiding curve and the plow working factors influencing on two targets, traction resistance and turn performance, were discussed and the factors optimization was made. The results show that tangent angle of guiding curve endpoints has a remarkable influence on two targets; in addition, it is benefit for reducing traction resistance and enhancing turn performance when the angle is large. Under the optimal condition, traction resistance is 4.40kN and turn performance reaches the optimal level 8.0.

Abstract: A type of tribometer for experimental study of tribological performance of journal bearings under micro-load was developed, which utilizes the method of load counterpoise to obtain mechanics equilibrium state of the test rig so as to apply load from zero. A laser device and a PSD sensor were used to measure the displacement and friction force with high precision without contact. The friction coefficient is obtained from the frictional angle of the cantilever and displacement of PSD sensor. Two methods were used for the measurement of friction coefficient, friction angle and frictional torque equilibrium. The former measures the angle resulting from friction, and the latter utilizes the exterior torque to poise the rig mechanics state under the rotating condition. The zero location on PSD is at the tail end of test process. Through reaching one side weight limitation with pulley at the static state, calibration of load was completed. The tribometer can measure friction, stick-slip of journal bearings under micro-load. Furthermore, measurements of wider range of load and /or friction coefficient were achieved by setting the structure parameters of the tribometer. With data sampling and processing capability, bearing bulk temperature and friction coefficient can be obtained continuously with adjustable load or/and speed.

Abstract: The essay produces some experience and lessons as to skills competition of college students of China universities. It points out that it is good not only for contestants and instructors but also for university. It takes lots of time and money to prepare for competitions. To obtain achievement, instructors and contesters should work hard and they should do much research work on how to improve skills of competition. The authors introduce some experience in details and regard it helpful to guide other skills contests. The experience and lessons has the value of promotion.

Abstract: According to Dawenkou bridge, a seriously deteriorated rigid-frame arch bridge, typical deteriorations of rigid-frame arch bridges were summarized. Based on 3-dimensional finite element model of a rigid-frame arch bridge, the relationship between dynamic properties and deteriorations of the structure, especially the influence of lateral tie system on the dynamic properties of the structure was analyzed. The results show that, damages of lateral tie system in operation induced premature appearance of lateral vibration directly; however, the large curvature torsion of deck obviously should take the mainly responsibility of damages of lateral tie system. According to the above analysis, the corresponding reinforcement scheme and specific measures were proposed.