检索结果-内蒙古大学图书馆

Simulation of a Novel Single-column Cryogenic Air Separation Process Using LNG Cold Energy

Physics Procedia 2015年 67卷 116-122页

作者： Zheng Jieyu Li Yanzhong Li Guangpeng Si Biao Institute of Refrigeration and Cryogenics Xi’an Jiaotong University Xi’an710049China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an710049China

In this paper, a novel single-column air separation process is proposed with the implementation of heat pump technique and introduction of LNG coldenergy. The proposed process is verifiedand optimized through simulation on the Aspen Hysys® platform. Simulation results reveal that thepower consumption per unit mass of liquid productis around 0.218 kWh/kg, and the total exergy efficiency of the systemis 0.575. According to the latest literatures, an energy saving of 39.1% is achieved compared with those using conventional double-column air separation *** introduction of LNG cold energy is an effective way to increase the system efficiency.

关键词： heat pump cryogenic air separation single-column process LNG cold energy recovery Aspen Hysys® simulation

来源：评论

学校读者我要写书评

暂无评论

Thermal-hydraulic analysis and metal temperature computation for the water wall of a 1000MW ultra supercritical tower boiler with double reheat

Thermal-hydraulic analysis and metal temperature computation...

引用

International Conference on power engineering, ICOPE 2015

作者： Yang, Dong Wang, Long Bi, Yanshuang Xie, Beibei Wang, Gang Yao, Danhua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University No.28 Xianning West Road Xi'an Shaanxi710049 China Shanghai Boiler Works Ltd. No.250 Huaning Road Minhang District Shanghai200245 China

The ultra supercritical boiler technology with double reheat can significantly increase the efficiency of a Rankine cycle power plant, and reduce fuel consumption for a given output. Recently China is developing 1000MW ultra supercritical boiler with double reheat which is arranged in tower type and the steam parameters are 350bar, 605oC/613oC/613oC. Thermal-hydraulic analysis is the key factors for the design and operation of ultra supercritical boiler with double reheat. According to the boiler structure and furnace-sided heat flux, the water wall of an ultra supercritical tower boiler with double reheat is treated in this paper as a flow network system consisting of series-parallel loops, pressure grids and connecting tubes. Based on the mass, momentum and energy conservations and some supplementary equations, a mathematical model is developed. Pressure drop, mass flux distribution, outlet vapor temperatures and metal temperatures data in the water wall at BMCR (boiler maximum continuous rating), 75% THA (turbine heat acceptance) and 30% THA load are obtained by iteratively solving the mathematical model. The results show that the water wall in the ultra supercritical boiler can operate safely. © 2015 The Japan Society of Mechanical Engineers.

关键词： Pressure drop

来源：评论

学校读者我要写书评

暂无评论

Experimental study on CO2/SO2/NOx simultaneous absorption and separated desorption using compound amine sulphone solution

Experimental study on CO2/SO2/NOx simultaneous absorption an...

引用

International Conference on power engineering, ICOPE 2015

作者： Luo, Qinlan Li, Na Zhou, Qulan Zhang, Yi Shen, Jizhao State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Department of Housing and Circumjacent Property Management Xi'an Jiaotong University Xi'an710049 China Yangzhou Chenguang Special Equipment Co. Ltd. Yangzhou225800 China

To simplify devices and reduce the high energy consumption in removal processes of air pollutants in fossil fuel-fired power plants, the compound amine sulphone solutions of N-Methyldiethanolamine (MDEA) and dimethyl sulfoxide (DMSO) were explored for the simultaneous removal of CO2/SO2/NOX. The dynamic experiments of CO2/SO2/NOX simultaneous absorption and separated desorption were carried out to confirm the feasibility of the experimental system and evaluate the performance of the studied compound amine sulphone solution. The experimental results indicated that the simultaneous removal of CO2/SO2/NOX was feasible by the compound amine sulphone solution, the separate desorption of CO2 and NO was realized when the regeneration temperature was set at 50°C and 90°C, respectively. Especially, the solution of 2M MDEA +1M DMSO showed the highest absorption capacity and desorption capacity. © 2015 The Japan Society of Mechanical Engineers.

关键词： Desorption

来源：评论

学校读者我要写书评

暂无评论

The selective catalytic reduction of NOx with CH4 on La1-xSrxMnO3 (x=0.2, 0.4) catalysts

The selective catalytic reduction of NOx with CH4 on La1-xSr...

引用

International Conference on power engineering, ICOPE 2015

作者： Zhang, Hang Li, Na Zhou, Qulan Lv, Chen Huang, Sijia Shen, Jizhao State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Huazhong University of Science and Technology Wuhan430074 China Fujian Electric Power Survey and Design Institute Fuzhou350003 China Yangzhou Chenguang Special Equipment Co. Ltd. Yangzhou225800 China

Two kinds of typical perovskite catalysts La1-xSrxMnO3 (x=0.2, 0.4) as new catalysts for using in CH4-NO and CH4-N2O reaction is proposed, and the preparation method, characterization, catalytic activity of La1-xSrxMnO3 was investigated. The catalysts powder via sol-gel method was successfully synthesized in this paper. In addition, the catalytic activity of supported La1-xSrxMnO3 catalyst was tested in fixed bed reactor, and the effects O2 concentration on catalyst activity were explored at three different temperatures, 600°C, 700°C and 800°C. The catalytic reduction of NO and N2O by CH4 over La0.8Sr0.2MnO3 and La0.6Sr0.4MnO3 catalyst was performed separately. The conversion ratio of N2O was usually higher than that of NO when the temperature and other conditions were the same. With the decrease of temperature, the range of O2 concentration becomes narrower obviously on the NO conversion. However, the O2 content doesn't seem to have significant in fluence on the N2O conversion ratio. The La0.8Sr0.2MnO3 performed better on the reaction of CH4 and N2O when temperature increased, wh ile the La0.6Sr0.4MnO3 performed best on 700°C with a ratio of about 90%. © 2015 The Japan Society of Mechanical Engineers.

关键词： Perovskite

来源：评论

学校读者我要写书评

暂无评论

Optimization of Hydrogen Distribution Network Considering Pressure and heat recovery

引用

Energy Procedia 2015年 75卷 1147-1152页

作者： Ruifeng Dong Yunsong Yu Zaoxiao Zhang State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 PR China School of Chemical Engineering and Technology Xi’an Jiaotong University Xi’an 710049 PR China

Hydrogen is an important resource in chemical processes. In the hydrogen network, many units are operating at high temperature and pressure, which leads to a large energy change of hydrogen streams. However, the recovery of heat and work in the hydrogen flows has seldom been studied together with the optimization of hydrogen network. It is obviously that the reuse of heat and work energy will raise the effective utilization rate of energy. The recovery of heat could be realized by heat exchangers. The recovery of work will be realized by rotary work exchangers, which are composed of several compressors and turbines with the same shaft. A state space superstructure is adopted to handle all the variables. The mathematical model is built based on exergoeconomic analysis considering both energy and economic factors. The optimization problem will be a mixed integer nonlinear programming (MINLP) problem. The existing algorithms will be improved. A typical refinery hydrogen network is studied as an example. The state space superstructure, exergoeconomic analysis and proposed algorithm could solve the problem competently. The consideration of pressure and heat recovery could reduce the energy consumption and economic cost simultaneously.

关键词： Hydrogen network Heat recovery Work recovery Exergoeconomic analysis Global optimization algorithm

来源：评论

学校读者我要写书评

暂无评论

Experimental research on simultaneous removal of CO2, SO2 and NOx by amine-sulphone solution

Experimental research on simultaneous removal of CO2, SO2 an...

引用

International Conference on power engineering, ICOPE 2015

作者： Li, Lian Bin, Hu Li, Na Zhou, Qulan Zhang, Yi Shen, Jizhao State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China North China Power Engineering Co. Ltd China Power Engineering Consulting Group Beijing100120 China Department of Housing and Circumjacent Property Management Xi'an Jiaotong University Xi'an710049 China Yangzhou Chenguang Special Equipment Co. Ltd. Yangzhou225800 China

Environmental problems caused by CO2, SO2, NOx and other pollutants have become increasingly prominent. It has been a research hotspot to remove CO2, SO2 and NOx simultaneously with simple technique, relative lo w operation cost. We made amine-sulphone solution with N-methyl-diethanolamine (MDEA) and dimethyl sulfoxide (DMSO) as the absorbent of SO2/CO2/NOx. A bubbling bed absorption system was designed and built to investigate the absorption properties of amine-sulphone solution toSO2/CO2/NOx. The solution formula and working condition were discussed to figure out the optimu m choices of formula, solution concentration and flo w rate of flue gas. According to the regulations of absorption rate, absorptive amount and removal ratio, the solution formula with 52.5%MDEA+17.5%DMSO showed the best simultaneous absorption properties to SO2/CO2/NOx. And 70% were the optimum concentration choice for the of amine-sulphone solution, taking absorbent cost, mass transfer and absorption quality into consideration. There's a flow rate inflexion point for the absorption of each gas, which is the boundary of rapid dropping and stable interval of removal ratio. The minimum of inflexion point for SO2/CO2/NOx was the optimu m flue gas flo w rate for high removal ratio and low cost, which was 1L/min in the experiment. © 2015 The Japan Society of Mechanical Engineers.

关键词： Carbon dioxide

来源：评论

学校读者我要写书评

暂无评论

Analysis of accidental loss of pool coolant due to leakage in a PWR SFP

引用

Annals of Nuclear Energy 2015年 77卷 65-73页

作者： Xiaoli Wu Wei Li Yapei Zhang Wenxi Tian Guanghui Su Suizheng Qiu State Key Laboratory of Multiphase Flow in Power Engineering School of Nuclear Science and Technology Xi’an Jiaotong University No. 28 Xianning West Road Xi’an Shanxi 710049 China

A large loss of pool coolant/water accident may be caused by extreme accidents such as the pool wall or bottom floor punctures due to a large aircraft strike. The safety of SFP under this circumstance is very important. Large amounts of radioactive materials would be easily released into the environment if a severe accident happened in the SFP, because the spent fuel pool (SFP) in a PWR nuclear power station (NPS) is often located in the fuel handing building outside the reactor containment. To gain insight into the loss of pool coolant accident progression for a pressurized water reactor (PWR) SFP, a computational model was established by using the Modular Accident Analysis Program (MAAP5). Important factors such as Zr oxidation by air, air natural circulation and thermal radiation were considered for partial and complete drainage accidents without mitigation measures. The calculation indicated that even if the residual water level was in the active fuel region, there was a chance to effectively remove the decay heat through axial heat conduction (if the pool cooling system failed) or steam cooling (if the pool cooling system was working). For sensitivity study, the effects of emergency ventilation and water injection on the accident progression were analyzed. The analysis showed that for the current configuration of high-density storage racks, it was difficult to cool the spent fuels by air natural circulation. Enlarging the space between the adjacent assemblies was a way of increasing air natural circulation flow rate and maintaining the coolability of SFP. Water injection to the bottom of the SFP helped to recover water inventory, quenching the high temperature assemblies to prevent melting, and even the molten corium pool to avoid molten-corium-concrete-interaction (MCCI).

关键词： Spent fuel pool MAAP5 Loss of pool coolant Mitigation measures

来源：评论

学校读者我要写书评

暂无评论

A study of the effect of microstructure on liquid-solid impact

A study of the effect of microstructure on liquid-solid impa...

引用

International Conference on power engineering, ICOPE 2015

作者： Teng, Zhaohui Li, Na Zhou, Qulan Chen, Xi State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Department of Earth and Environmental Engineering Columbia University New YorkNY10027 United States International Center for Applied Mechanics SV Lab School of Aerospace Xi'an Jiaotong University Xi'an710049 China

Liquid drops hit against solid surface, which has an enormous influence on the mechanical properties of base solid surface during its service. Impact of the droplet makes the solid surface and some internal section of the base solid material generate high stress. The conical microstructure may decrease the dimensionless equivalent stress in solid. We investigated the effect of the microstructure with three different sizes by numerical simulation. In the paper, detail theoretic analyses of liquid-solid impact were carried out. Here the mathematics physics model was built to solve the liquid-solid impact problem The numerical method coupling liquid and solid region was designed and the impact procedure of spherical droplet to solid materials was simulated. We acquired the pressure distribution inside water drop and the transient equivalent stress field inside solid. High stress at the solid surface and some internal sections arose from impact of the droplet. The sections in solid with highest stress can be classified into the contact edge and the axis due to stress superposition. The stress in solid declined slightly at the condition with the microstructure (5μm high and a diameter of 1μm). The microstructure (50μm high and a diameter of 10μm) in this paper considerably decreased the average stress in solid. They may store liquid and yield a liquid film higher than the thickness of the microstructure, undertaking the droplet impact and acting as a cushion to the stress concentration in solid. These results may play a role in evaluating the base solid service properties based on the fundamental solution of liquid-solid impact and be valuable to understand the internal mechanism of liquid-solid impact, and are helpful to prevent the erosion of droplet to the solid materials. © 2015 The Japan Society of Mechanical Engineers.

关键词： Microstructure

来源：评论

学校读者我要写书评

暂无评论

Erosion of Premium Connection Cross-over Joint in Solid-liquid flow

Erosion of Premium Connection Cross-over Joint in Solid-liqu...

引用

The 2015 2nd International Conference on engineering Technology and Application

作者： Yong'an Zhao Wenbin Cai Lu Cui Jiarui Cheng Yihua Dou School of Mechanical Engineering Xi'an Shiyou University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University School of Mechanical Engineering Xi'an Shiyou University

Hydraulic fracturing is a new technique which is used in oil yield to maximize its own *** pumping of fracturing slurry flow through tubing collar can cause considerable mass loss of inner surface *** may pose a significantly potential risk even a well ***,the erosion phenomenon is particularly serious in the structure of variable *** simulation in this paper was used to get particle impact parameters,and it is combined with jet experiments to find out the main factors of BG-13 Cr mass ***,the equation with experimental data was applied to predict erosion rate of premium connection cross-over joint inner wall.

关键词： premium connection erosion rate numerical simulation Jet flow experiments

来源：评论

学校读者我要写书评

暂无评论

Numerical Simulation on the Laser Induced Oxygen Spark under Different Ambient Conditions

引用

Energy Procedia 2015年 75卷 2409-2414页

作者： Liu Jiping Chen Keqiang Zhang Xiaobo Wang Jinshi Yan Junjie Yoshiro Deguchi Moe Key Laboratory of Thermo-Fluid Science and Engineering Xi’an Jiaotong University Xi’an 710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China Department of Mechanical Engineering The University of Tokushima Tokushima 770-8501 Japan

As a new type of ignition technique, laser induced spark ignition can be widely used in the ignition system of internal combustion engines and aero-engines. In this paper, laser induced oxygen spark evolution has been numerically studied with a two-dimensional, unsteady, multi-components and time-accurate model under different ambient temperatures and pressures. The chemical kinetics between species has been considered. A commercial software Fluent is used to solve the problem. Results show that both ambient conditions have great effect on the maximum temperature and maximum pressure of oxygen spark initially, but the effect decreases with time going on. The maximum velocity and maximum electron number density are also prominently influenced by ambient conditions. For the relationship between shock wave radius and time, ambient temperature plays an important role while ambient pressure is insignificant. These results above will be the foundation for the applications of laser induced spark ignition in the future.

关键词： laser induced ignition Oxygen Spark Ambient Factors Numerical Simulation

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：