Applied Mechanics and Materials Vols. 411-414

Abstract: This article adopts resistance method measuring saturation, and do research about the impact of polymer resistance - saturation curve measurement. Results showed that in the resistance method for detection of residual oil distribution, there are significant effects of the experiment of water salinity on measuring the resistance and standard curve. When the polymer water ionic concentration is small, resistances of polymers are double impacted by the salinity of formation water and the polymer concentration. Experiments show that as the polymer concentration increased, the resistance value decreases. In view of the configuration of CNOOC formation water polymer, concentration has no effect on resistance of basic, the influence of polymer for measuring resistance value and relation curve is mainly depended on formation water salinity, and consistent with the influence of formation water salinity.

Abstract: The perturbed-chain statistical associating fluid theory (PC-SAFT) is used to correlate and predict the phase equilibria and the triple point pressure of CO₂ and ethanol binary mixtures. The binary interaction parameters (k_ij) are regressed by fitting to the experimental data of mixtures. The vapor-liquid equilibria and liquid-liquid equilibria of the mixtures are investigated and the influence of temperature and pressure on the phase equilibria and the triple point pressures is demonstrated. Our results show that the pressure dependent k_ij can describe the phase equilibria of CO₂- ethanol mixtures quantitatively well.

Abstract: Abstract: The Polymer is one of the efficient ways to increase to the crude oil production rate,but this method has big impact on the properties of crude oil. We studied the differences between the Polymer flooding sample and H2O flooding sample experimentally.The adsorption method was adopted to analyze the content of resins and asphaltenes in the oil samples. By measuring the exhalation rate of the H2O, the stability of the emulsifying properties which are affected by the resins and asphaltenes were studied. Then, we measured the viscosity and the interfacial tension of the crude oil samples to further explore the differences.The results shows that the contents of resins and asphaltenes and the stability of the emulsion in the Polymer flooding oil sample are all higher than that in the H2O flooding oil sample, the interfacial tension and the viscosity of the produced water in the Polymer flooding oil sample are all lower than that in the H2O flooding oil sample.

Abstract: The solubility and saturated loading of CO₂ in piperazine (PZ) promoted 2-amino-2-methyl-1-propanol (AMP) aqueous solution were measured at normal pressure with temperatures ranging from 293.15K to 323.15K. The temperature and the mass fraction dependences of the solubility and saturated loading of CO₂ were determined. The influence of the mass fraction of PZ on the absorption rate of CO₂ was illustrated.

Abstract: The novel packaging was synthesised by coating polyvinyl chloride (PVC) film with Polyvinylamine/Polyvinyl alcohol (PVAm/PVA) mixture which can effectively inhibit the migration of DOP in this paper. The effect of PVAm/PVA mixture on inhibiting DOP migration was detected via extraction tests. The results showed that the novel packaging significantly reduced the migration rate of DOP compared with the control (PVC film). After 24h extracted by hexane 40% PVAm in mixture being coated on PVC had the lowest migration rate (6.20%) among the samples, while 7.60% is the migration rate of control sample. Tensile properties analysis indicated the elongation at break and tensile strength of samples coating PVAm/PVA higher than control sample. The thermogravimetric analysis demonstrated that the PVAm/PVA mixed solution can deduce thermogravimetric rate. Therefore, coating PVC with PVAm/PVA mixture is an effective approach to suppress the migration of DOP.

Abstract: Based on several structure optimization parameters for the description of the geometric features of a double oblique radial swirler, simplified structure design parameters and value interval were determined. And, the CFD analysis model of the swirler is established. Based on the approaches of multi-wheel space filling experimental designs, 17 design schemes were gained, then CFD numberical experiments on the cold single-phase flow field was developed to all design schemes. Finally, the optimal design scheme were found by numberical space filling experimental design method in a several turn.

Abstract: A simulation investigation have been carried out to research the relationships between rejection pressure and related operating parameters and the performance of a heat pump cycle with an expander (HPCE) respectively using CO2 and R134a as refrigerant. With the increase of exhaust pressure, the CO2 cycle has an optimum rejection pressure that is 8.667MPa, and the maximal COP is 4.189, in addition, R134a cycle is a reducing trend. When the Condensing temperature of compressor is gradually increasing, the performances of CO2 cycles gradually decline, but the R134a cycle just has small changes. With the increasing of evaporating temperature, the performances of all cycles are an increasing trend.

Abstract: In order to test and verify the accuracy and reasonable of the mathematical model of the high-pressure air blowing the main ballast tanks, the paper design a submarine self-propelled model with the system of high-pressure air blowing the ballast tanks.Through the experiment without propulsion , the paper obtains drainage performance and key performance parameters of motion.Through the comparing of CFD, the result shows the ability to describe correctly the process of high-pressure air blowing ballast tanks.

Abstract: Biomass pyrolysis for preparing bio-oil was studied on the vacuum pyrolysis system, where rape straw was chosen as the raw material. The experiment was designed by orthogonal method. And pyrolysis temperature, system pressure, heating rate and holding time were chosen as input variables to establish the prediction models about bio-oil yields and energy transformation ratio based on Generalized Regression Neural Network. The parameters of vacuum pyrolysis system were optimized for maximizing bio-oil yields and energy transformation ratio, and the optimization result was verified by experiment. The results of research show that the predicted values are fit well with the experimental values, which verifies the effectiveness of the prediction models. When pyrolysis temperature is 486.8°C, system pressure is 5.0kPa, heating rate is 18.1°C/min and holding time is 55.0min, bio-oil yield is 43.6% and energy transformation ratio is 35.5%. Both are close to the maximum, and the result is accurate by experimental verification.

Abstract: The urban heating is closely linked with peoples life. The chosen of heating scheme is affected by the index of energy-saving and emission-reduction. In this thesis the computational model of the indexes for different range were built and the indexes of four schemes were calculated. The results predicted the energy-saving and emission-reduction of each scheme and provided references for the government to formulate assessment criteria.