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Photocatalytic degradation of dye effluent by titanium dioxide pillar pellets in aqueous solution

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Journal of Environmental Sciences 2004年第3期16卷 375-379页

作者： eric hu School of Engineering and Technology

Photocatalytic oxidation(PCO) process is an effective way to deal with organic pollutants in wastewater which could be difficult to be degraded by conventional biological treatment methods. Normally the TiO 2 powder in nanometre size range was directly used as photocatalyst for dye degradation in wastewater. However the titanium dioxide powder was arduous to be recovered from the solution after treatment. In this application, a new form of TiO 2(i. e. pillar pellets ranging from 2 5 to 5 3 mm long and with a diameter of 3 7 mm) was used and investigated for photocatalytic degradation of textile dye effluent. A test system was built with a flat plate reactor(FPR) and UV light source(blacklight and solar simulator as light source respectively) for investigating the effectiveness of the new form of TiO 2. It was found that the photocatalytic process under this configuration could efficiently remove colours from textile dyeing effluent. Comparing with the TiO 2 powder, the pellet was very easy to recovered from the treated solution and can be reused in multiple times without the significant change on the photocatalytic property. The results also showed that to achieve the same photocatalytic performance, the FPR area by pellets was about 91% smaller than required by TiO 2 powder. At least TiO 2 pellet could be used as an alternative form of photocatalyst in applications for textile effluent treatment process, also other wastewater treatment processes.

关键词： dyes degradation photocatalytic reactions TiO 2 catalyst

An Energy Production System Powered by Solar Heat with Biogas Dry Reforming Reactor and Solid Oxide Fuel Cell

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Smart Grid and Renewable Energy 2023年第5期14卷 85-106页

作者： Akira Nishimura Ryotaro Sato eric hu Division of Mechanical Engineering Graduate School of Engineering Mie University Tsu Japan School of Electrical Mechanical Engineering The University of Adelaide Adelaide Australia

In this paper, an energy system consisting of solar collector, biogas dry reforming reactor and solid oxide fuel cell (SOFC) has been proposed. The heat produced from the concentrating solar collector is used to drive a biogas dry reforming reactor in order to produce H2 as a fuel for SOFC, in such as system. The aim of this study is to clarify the impact of climate data on the performance of solar collector with various sizes/designs. The temperature of heat transfer fluid produced by the solar collector is calculated by adopting the climate data for Nagoya city in Japan in 2021. The amount of H2 produced from the biogas dry reforming reactor and the power generated by SOFC were simulated. The results show the temperature of heat transfer fluid (Tfb) and Tfb ratio (a) based on the length of absorber (dx) = 1 m have a peak near the noon following the trend of solar intensity (I). Results also revealed that a increases with increase in dx. It is found that the differences of Tfb and a between dx = 2 m and dx = 3 m are larger than those between dx = 1 m and dx = 2 m. It is revealed that Tfb and a are higher in spring and summer. dx = 4 m is the optimum length of solar absorber. The amount of H2 produced from the biogas dry reforming reactor as well as the power generated by SOFC is the highest in August, resulting that it is prefer to produce H2 and to generate SOFC in summer.

关键词： Solar Collector Fluid Temperature Climate Data Biogas Dry Reforming H2 Production SOFC

Optimization Potentials for the Waste Heat Recovery of a Gas-Steam Combined Cycle Power Plant Based on Absorption Heat Pump

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Journal of Thermal Science 2019年第2期28卷 283-293页

作者： ZHANG Hongsheng ZHAO Hongbin LI Zhenlin hu eric College of Machinery and Transportation Engineering China University of Petroleum School of Mechanical Engineering the University of Adelaide Beijing Key Laboratory of Process Fluid Filtration and Separation

A new waste heat recovery system is presented to recover exhausted steam waste heat from the steam turbine by absorption heat pump(AHP) in a gas-steam combined cycle(GSCC) power plant. The system can decrease energy consumption and further improve the energy utilization. The performance evaluation criteria are calculated, and exergy analysis for key components are implemented in terms of the energy and exergy analysis theory. Besides, the change of these criteria is also revealed before and after modification. The net power output approximately increases by 21738 kW, and equivalent coal consumption decreases by 5.58 g/kWh. A 1.81% and 1.92% increase in the thermal and exergy efficiency is respectively obtained in the new integrated system as the heating load is 401095 kJ at 100% condition. Meanwhile, the appropriate extraction parameters for heating have been also analyzed in the two systems. The proposed scheme can not only save energy consumption but also reduce emission and gain great economic benefit, which is proven to be a huge potential for practical application.

关键词： combined cycle power plant absorption heat pump waste heat recovery evaluation criteria exergy analysis

Effects of pH on rheological characteristics and stability of petroleum coke water slurry

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Petroleum Science 2016年第4期13卷 782-787页

作者： Fu-Yan Gao eric-J.hu Ningbo Institute of Technology Zhejiang University School of Mechanical Engineering University of Adelaide

In this study, the effects of pH on slurrying properties of petroleum coke water slurry（PCWS） were investigated. The slurrying concentration, rheological characteristics and stability of PCWS were studied with four different types of additives at pH varying from 5 to *** results showed that the slurrying concentration, rheological characteristics and stability of PCWS all increased at first and then decreased with increasing pH from 5 to 11,and a pH of around 9 was found to be the most favorable acid–alkali environment to all these three slurrying properties. It was also indicated that only in a moderate alkaline environment can the additives be active enough to react with particle surfaces sufficiently to obtain good slurrying concentration and form a stable three-dimensional network structure, which can support strong pseudoplastic characteristics and good stability. An acid environment was a very unfavorable factor to the slurrying properties of PCWS.

关键词： Petroleum coke Petroleum coke water slurry pH Slurrying concentration Rheological characteristics Stability

Inherent relations between yield stress and stability of bubble petroleum coke water slurry

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Petroleum Science 2018年第1期15卷 157-163页

作者： Fu-Yan Gao eric J.hu Ningbo Institute of Technology Zhejiang University School of Mechanical Engineering The University of Adelaide

The stability of petroleum coke water slurry（PCWS） is currently a hot topic. The inherent relationship between yield stress and stability of bubble-PCWS was studied through orthogonal experiments and range analysis in this work. The results showed that the stability of bubble-PCWS was positively related to the yield stress and that the yield stress could be greatly impacted by the operation conditions during preparation of bubble-PCWS. The main factors affecting the yield stress of bubble-PCWS were solid concentration, aeration time and dosage of frother. However, the effects of aperture size of air distribution plates and type of frother on the yield stress were slight within the experimental range. The optimal conditions for the greatest yield stress were as follows： aeration time of 30 min, solid concentration of 65 wt%, frother dosage of0.030 wt% of the air-dried pulverized petroleum coke, aperture size of air distribution plate of 2-5 lm and AOS *** yield stress and the pour rate of bubble-PCWS under this optimum operation condition could reach maxima of more than 0.4 Pa and 96%, respectively.

关键词： Petroleum coke Petroleum coke water slurry (PCWS) Stability Yield stress Orthogonal experiment

IDMI Analysis of Regional Low-Carbon Development Based on System Dynamic Simulation

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Transactions of Tianjin University 2013年第5期19卷 338-344页

作者：贺媛媛 hu eric 谭欣 School of Environmental Science and Technology Tianjin University School of Mechanical Engineering University of Adelaide

During the decision-making process,especially in multi-disciplinary complex cases,assessment technique is needed to assist policy-makers in making the right *** of such assessment techniques have been developed for policy-makers,but the inevitable subjectivity of policy-makers often becomes the main obstacle in making the right or proper *** decision-making index(IDMI)is a newly proposed assessment method with the advantages of being simple to use and having less human interference over other methods,as it does not require a weighting process of each selection *** paper implements IDMI to assist with decision-making in national or regional low-carbon development,using China as a case *** Chinese government has announced its carbon emission reduction target along with other development targets by *** policy settings can be chosen in order to achieve those *** problem is how to determine the best setting and the means by which decision-makers can avoid subjectivity and extremes.A number of policy setting options are generated carefully by a system dynamic model under different policy *** IDMI demonstrates a perfect way to assist in selecting the"best"among all the options that can achieve the goals within the acceptable range.

关键词：动态仿真系统低碳分析基决策过程中国政府决策者评价方法

Solar aided power generation:A review

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能源与人工环境(英文) 2020年第1期1卷 11-26页

作者： Jiyun Qin eric hu Xiaohua Li China Institute of FTZ Supply Chain Shanghai Maritime UniversityShanghai 201306 China School of Mechanical Engineering the University of AdelaideSA 5005 Australia Department of Building Engineering Hunan Institute of Engineering411104 HunanChina

Solar Aided Power Generation(SAPG)is the most efficient and economic ways to hybridise solar thermal energy and a fossil fuel fired regenerative Rankine cycle(RRC)power plant for power generation *** such an SAPG plant,the solar thermal energy is used to displace the extraction steam by preheating the feedwater to the *** displaced/saved extraction steam can,therefore,expand further in the steam turbine to generate *** research and development of the SAPG technology started in the *** paper is trying to reviews and summarises the progress of research and development of the SAPG plant technology in last almost 30 or so years,including the technical and economic advantages of SAPG over other solar thermal power generation tech-nologies(*** alone power generation),various modelling techniques used to simulate SAPG perforamnce,impacts of SAPG plant’s configuration,size of solar field and strategies to adjust mass flow rate of extraction steam on the plant perforamnce,exergy analysis of SAPG plant and operation strategies to maximise plant’s economic returns *** addition,the directions for future R&D about SAPG technology have been pointed/proposed in this paper.

关键词： Solar thermal power system Hybrid power system Solar preheating Solar Aided Power Generation

Numerical Analysis on Temperature Distribution in a Single Cell of PEFC Operated at Higher Temperature by1D Heat Transfer Model and 3D Multi-Physics Simulation Model

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Energy and Power Engineering 2023年第5期15卷 205-227页

作者： Akira Nishimura Kyohei Toyoda Daiki Mishima eric hu Division of Mechanical Engineering Graduate School of Engineering Mie University Tsu Japan

This study is to understand the impact of operating conditions, especially initial operation temperature (Tini) which is set in a high temperature range, on the temperature profile of the interface between the polymer electrolyte membrane (PEM) and the catalyst layer at the cathode (i.e., the reaction surface) in a single cell of polymer electrolyte fuel cell (PEFC). A 1D multi-plate heat transfer model based on the temperature data of the separator measured using the thermograph in a power generation experiment was developed to evaluate the reaction surface temperature (Treact). In addition, to validate the proposed heat transfer model, Treact obtained from the model was compared with that from the 3D numerical simulation using CFD software COMSOL Multiphysics which solves the continuity equation, Brinkman equation, Maxwell-Stefan equation, Butler-Volmer equation as well as heat transfer equation. As a result, the temperature gap between the results obtained by 1D heat transfer model and those obtained by 3D numerical simulation is below approximately 0.5 K. The simulation results show the change in the molar concentration of O2 and H2O from the inlet to the outlet is more even with the increase in Tini due to the lower performance of O2 reduction reaction. The change in the current density from the inlet to the outlet is more even with the increase in Tini and the value of current density is smaller with the increase in Tini due to the increase in ohmic over-potential and concentration over-potential. It is revealed that the change in Treact from the inlet to the outlet is more even with the increase in Tini irrespective of heat transfer model. This is because the generated heat from the power generation is lower with the increase in Tini due to the lower performance of O2 reduction reaction.

关键词： PEFC Heat Transfer Model Temperature Distribution Numerical Simulation High Temperature Operation

Performance analysis of a solar-aided power generation(SAPG) plant using specific consumption theory

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Science China(Technological Sciences) 2016年第2期59卷 322-329页

作者： HOU HongJuan WANG MengJiao YANG YongPing CHEN Si hu eric National Thermal Power Engineering and Technology Research Center North China Electric Power University University of Kentucky Power and Energy Institute of Kentucky School of Mechanical Engineering University of Adelaide

In contrast to a traditional coal-fired power generation plant where steam extracted from a turbine is used to preheat the feedwater in all preheating stages, a solar-aided power generation(SAPG) plant uses solar heat to replace a part or all of the extracted steam in one or more preheating stages. The performance of an SAPG plant with different replacements is investigated in this study by using specific consumption theory(SCT). Fuel-specific and cost-specific consumption models for SAPG plants are built based on the SCT. A typical 330 MW coal-fired power plant is used as the study case. The performance of the SAPG plant in terms of specific consumption, with steam obtained from the first through the eighth(except for the fourth) stages of extraction replaced by solar heat, is compared with that of the reference coal-fired power plant. The fuel-specific consumption of the SAPG plant is determined to be lower than that of the reference coal-fired power plant. The fuel-specific consumption accrual distribution in SAPG plants is used to assess the effect of each individual replacement. Effective strategies to reduce the specific costs of the SAPG and coal-fired power plants are proposed based on the results of this study.

关键词：燃煤发电厂植物利用消费模式性能分析太阳能燃煤电厂预热阶段装置性能