Advanced Materials Research Vols. 550-553

Abstract: A new method is proposed which use optimization modules of finite element established by Ansys Parametric Design Language program to inverse rock mechanics parameters of surrounding rock with the logging data of casing deformation. Therefore the rock mechanics parameters of surrounding rock can be obtained by this back-analysis method based on the elastoplastic deformation analysis of casing. The relation among angle of internal friction, cohesion, maximum horizontal principal stress and minimum horizontal principal stress which can be determined by Mohr-Coulomb failure theory is applied to back-analysis. The new approach is presented to solve the uniqueness of mechanics parameters. The method makes it possible to inverse rock mechanics parameters in the formation where the data of rock mechanics parameters measured are scarce and is more efficient than the traditional method

Abstract: Analyzed the methods of designing centrifugal fans' volute shape and summarized the characters,advantages,disadvantages and application scopes of various methods.On the base of unequal square method,this paper introudces the unequal square vertex parts line method and the unequal rectangle method in order to solve the problem of distangency of two adjacent circular arc.

Abstract: Comprehensive state analysis and life evaluation of the main components of reformer furnace run over service period by EPMA, microstructure and high temperature rupture property. The results show that element distribution and microstructure of reformer pipe, riser pipe, low collecting pipe and socket is normal and the remaining life is longer. The material of furnace pipe for the HK40 are able to meet the process requirement, but the wall thickness of reformer pipe is too large, affecting the thermal efficiency and the inner diameter is small to limit the catalyst and flow. It is good proposal to production enterprises that higher level of material such as ZG50Ni35Cr25NbM is selected to reduce the wall thickness properly, expand the diameter and improve efficiency. Similarly, it can also be appropriate for the riser pipe to choose a lower grade material and reduce the wall thickness and save cost.

Abstract: Based on the status that conversion rate of Single-stage compound chlorine dioxide generator is not high in the market，we designed a multi-stage compound chlorine dioxide generator and discussed the best reaction conditions. At the same time ,we also focused on the reaction temperature, reactor pressure, concentration of raw materials and raw materials ratio on the performance of generator. The results show that the best reaction conditions of water bath temperature was 70°C、gas pressure was 60 ml • min^-1、mass fraction of HCl was 24%、mass fraction of NaClO₃ was 26%、Molar ratio of HCl and NaClO ₃was 3. Under these conditions, the Index ,such as production of ClO₂、production of effective chlorine、yield and purity of ClO₂、consumption rate of NaClO₃ and the ratio of ClO₂/Cl₂,reached a higher level, providing the technical basis for the mass production of Multi-stage compound chlorine dioxide generator.

Abstract: Heat energy storage characteristics of a new type of PCM heat exchange tube was researched, in which it took the traditional double-tube exchanger as the total construction foundation and phase change material(CaCl2•6H2O) was filled in the annular area between the inner tube and the outer tube. As air with different temperatures flowed through the PCM heat exchange tube, temperature measurements were carried out at the inlet and the outlet by the experimental system. The experimental results showed that, a new type of PCM heat exchange tube could store heat energy from the hot air by the phase change material in the annular area, and discharge the stored heat energy into the required fluid if necessary. Thus it has two functions of heat exchange and heat energy storage, and is mainly suitable for recovery and utilizations of heat energy in greenhouses, buildings, air conditioning and manifold industrial afterheat or waste heat.

Abstract: Through orthogonal experiment scheme, this paper found the main factors influence on the effect of intermediate frequency electromagnetic pulse destressing, got a better intermediate frequency electromagnetic pulse destressing process parameters, put the optimized process into in the production practice, gained a good effect.

Abstract: This research was aim to apply heat pipe in the small pasteurizing machine for fruit juice process. The orange juice was used as the sample. The container of the pasteurizing machine was made from 304 stainless steel with 1.5 millimeter of thickness, 300 millimeter of inside diameter, and 374 millimeter high, with 20 liters capacity. In order to control the temperature distribution in the test tank, four heat pipes, that made from same material, were used as heating device that heated from LPG gas. The heat pipe had 0.8 millimeters of thickness, 25millimeter of internal diameter, and the length of 650 millimeters. The result was found that the pasteurizing machine can be pasteurized the orange juice as 88 degree celsius with 32.5 minutes of come up time. The temperature distribution of the orange juice in the tank was  0.5 degree celsius.

Abstract: Because of bilateral pulse tubes, wave rotor refrigerators (WRRs) have excellent fluidic operation performance. In this work, a WRR experimental rig with throughput of 3×104Nm3/d and expansion ratio 3 for hydrated gases has been built. A number of experiments show that the temperature of low pressure port of WRR has little influence on refrigeration efficiency. This makes possible of maintaining excellent refrigeration efficiency when WRR operating with high-liquid gases. Actual liquid experiments do show the excellent fluidic operation performance: the refrigeration performance remains almost unchanged even if WWR operates with 13.7 %( w) liquid ratio.

Abstract: Through the visualization experiment, the behavior evolution of the vapor and liquid slugs in the pulsating heat pipe (PHP) was investigated in the start-up process. Optical visualization results indicate that the flow pattern mainly is slug flow in the start-up process. In the early stage of the start-up process, the distribution of vapor and liquid slugs was random at the beginning, and then gradually develops to the other form which can easily pulsate in the PHP. In the later stage, pulsation stagnation in short time and reversing of the flow direction of the working fluid could be found at low heat load, when there exists the circulation flow in the PHP. Circulation was formed along a certain direction at high heat load. In addition, the PHP can be started up with less time and lower minimum start load by using working fluid which has lower latent heat.

Abstract: The urban heat pipe network fault diagnosis was studied in this paper. According to differential equations and boundary conditions, the author deduces the function relations between pressure and flow in unsteady flow. On the base of above investigations, a heat pipe network leak pipeline diagnosis method and a leak positioning method are proposed here, the pipeline alarm valve ε0 and the leak alarm valve εF are designed. We can judge whether heat pipe network leaks or not through the law of flow conservation, and search out the leak pipeline by judging the size relation of pressure drop, ε1 and ε0, before and after pipeline leaks. It then locates the leak point by judging the size relation of ε2 and εF before and after the pipeline leaks. Moreover, the location accuracy is 5%.