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Research on Modeling and Control of a 100 kW micro Bio-gas turbine

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Journal of Power and Energy Engineering 2021年第2期9卷 1-6页

作者： Xiaotao Zhang Xiang Liu Haoliang Mu Wenxian Zhang Aijun Wang Departments of Electric Power North China University of Water Resources and Electric Power Zhengzhou China

In order to know about the influences of disturbance on the operating performance, the present work developed the overall dynamic simulation model of the micro gas turbine and investigated the control system under the disturbances of environmental temperature and unit load. The response processes of main parameters have been obtained. It found that the compressor pressure ratio and the fuel flow rate increase in the case of natural gas being replaced by pine gas. When the system reaches a new steady state, the main parameters change to different values. The output power decreases with the declining of the air mass flow when the ambient temperature rises, the biomass gas mass flow rate increases under the regulation of the control system to maintain the output power and rotating speed in which the thermal efficiency reduces by 1.40%. The thermal efficiency enhances with the increase of output load. The control system can quickly and effectively act to maintain the key parameters at desired value.

关键词： micro gas turbine Biomass gas Overall Model turbine Control System

A New Approach to the Control for Start Process of a micro gas turbine

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A New Approach to the Control for Start Process of a Micro G...

Numerical Study on Thermoelectric Power Generator in Combustor

第二十四届中国控制会议

作者： Deng Wei, Zhang Huaguang(School of Information Science and Engineering, Northeastern University, Shenyang 110004. China)

＜正＞ The start process of a single shaft micro gas turbine for the application in case of generating electricity （100kW） is introduced in detail after the work procedure of the micro gas turbine is illustrated. The start process, in general, is the most critical phase. In view of distinguishing feature of the micro gas turbine, a fuzzy control approach of start process is presented and an innovational approach, the closed-loop start control, is employed. The optimal start control performance parameters during the start phase are obtained by study and experiment. Theoretical analysis and practical result show that the start process possesses the satisfactory performance. It is seen that by the fuzzy control, a convenient and flexible design approach of start control has been achieved. The practical application proved that the fuzzy control of start process by closed-loop method was efficient and available.

关键词： micro gas turbine fuzzy control start control start process

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Journal of Thermal Science 2022年第6期31卷 2124-2136页

作者： LI Na WU Peiqin LU Xing XU Jinhai WANG Qiuwang CHEN Yitung MA Ting Key Laboratory of Thermo-Fluid Science and Engineering MOEXi’an Jiaotong UniversityXi'an 710049China School of Safety Science and Engineering Xi’an University of Science and TechnologyXi'an 710054China Department of Mechanical Engineering University of NevadaLas Vegas NV 89154-4027USA

micro gas turbine is a typical distributed energy resource system. The temperature of the burning gas in the combustor reaches 1000 K or even more, which makes a huge temperature difference in the combustor an interesting topic for heat recovery. In this work, thermoelectric devices are used for heat recovery in the combustor of the micro gas turbine. A flow-thermal-electric multiple-physical numerical model is used for the combustor and thermoelectric device power generation system. The effect of the winglet vortex generators installed at the outer wall of the flame tube on the system performance is examined. The numerical results show that the best matching load is about 1.4 times the internal resistance which provides the maximum power output for the thermoelectric generator. Active cascade control of heat transfer enhancement elements on flame tube considering wall safety and conversion efficiency of thermoelectric generator under high temperature and large temperature drop is proposed. The numerical results show that the conversion efficiency of thermoelectric generator can be increased by more than 80%, and the average wall temperature can be reduced by 35 K by using non-uniform arrangement of the winglet vortex generators.

关键词： distributed energy resources micro gas turbine combustor thermoelectric generator winglet vortex generator

Effect of the Structure Parameters of a Low Swirler on Premixed Characteristics

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Journal of Thermal Science 2022年第1期31卷 207-213页

作者： SHEN Siyuan SONG Xiuyang ZONG Chao JI Chenzhen ZHU Tong School of Mechanical Engineering Tongji UniversityShanghai 201804China

Combustion with lean premixed and low swirl is an effective way of flame organization.It can improve the flame stability and reduce NOX emission.In this kind of combustion,one of the most important issues is fuel/air premixed characteristics.How the structure parameters influence that issue is figured out through numerical simulation.The structure parameters concerned in the study are as follows.They are shape of blades,number of blades,location and shape of gas jet.The influences of them are analysed with comprehensive consideration of many aspects.With the same light shading rate and stagger angle,the axial swirler with curved blades has worse premixed uniformity and lower pressure loss than the one with straight blades.With the same structure of each blade,the decrease of the quantity of blades does influence the pressure loss,while the quantity of gas jets changes correspondingly.But it has little effect on premixed uniformity in a certain range.However,more blades make contribution to better premixed performance.When the total flow area is the same,the axial and circumferential positions of the fuel jets also greatly influence the premixing process.When the fuel jets are upstream the blades and locate at middle of the vanes,the premixing performance is the best.Meanwhile,the jet direction of the fuel jets is a very important influencing factor of the premixing process.When the fuel jet direction is oblique downward at an angle of 30°to the horizontal,the premixing effect is better than the horizontal outflow,which is better than the oblique upward structure.

关键词： micro gas turbine low swirler premixed characteristics numerical simulation

Effects of Pilot Fuel Ratio on Combustion Process:Flow Field Structure and Pollutant Emissions

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Journal of Thermal Science 2023年第6期32卷 2321-2335页

作者： ZONG Chao JI Chenzhen CHENG Jiaying ZHU Tong Postdoctoral Station of Mechanical Engineering Tongji UniversityShanghai201804China School of Mechanical Engineering Tongji UniversityShanghai201804China

As the only controllable means of a micro gas turbine(MGT)combustor during unit operation,pilot fuel ratio(PFR)is the key to achieving stable combustion and low pollutant emission.This paper discusses the influence of PFR on the inner flow field structure and pollutant emissions.The steady-state three-dimensional RANS method with a 40-step reduced methane-air kinetics mechanism is used to study the reaction flow field and species field with PFR of 9.0%,12.7%,15.2%and 17.6%.Results show that,with the decrease in PFR,the axial velocity and temperature near the central axis of the combustion chamber show a tendency to decrease.A similar separation phenomenon occurred in the core pyrolysis reaction zone(measured by HCO)and oxidation zone(measured by OH),which is more conducive to promoting the oxidation of CO.The quantitative effect of the pilot flame on nitrogen oxides(NO_(x))was separated by using inert gas instead of nitrogen in combustion air.It was found that the NOx produced by the pilot flame under the operation condition with a PFR of 9.0%was 3.2×10^(−6),accounting for 17.4%of the total NOx emission,which was twice that of PFR.

关键词： micro gas turbine pilot fuel ratio flow field structure carbon monoxide nitrogen oxide

Fluid-Dynamics Analysis and Structural Optimization of a 300 kW microgas turbine Recuperator

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Fluid Dynamics & Materials Processing 2023年第6期19卷 1447-1461页

作者： Weiting Jiang Tingni He Chongyang Wang Weiguo Pan Jiang Liu Shanghai University of Electric Power Shanghai201306China

Computational Fluid Dynamics(CFD)is used here to reduce pressure loss and improve heat exchange efficiency in the recuperator associated with a gas turbine.First,numerical simulations of the high-temperature and lowtemperature channels are performed and,the calculated results are compared with experimental data(to verify the reliability of the numerical method).Second,the flow field structure of the low-temperature side channel is critically analyzed,leading to the conclusion that the flow velocity distribution in the low-temperature side channel is uneven,and its resistance is significantly higher than that in the high-temperature side.Therefore,five alternate structural schemes are proposed for the optimization of the low-temperature side.In particular,to reduce the flow velocity in the upper channel,the rib length of each channel at the inlet of the low-temperature side region is adjusted.The performances of the 5 schemes are compared,leading to the identification of the configuration able to guarantee a uniform flow rate and minimize the pressure drop.Finally,the heat transfer performance of the optimized recuperator structure is evaluated,and it is shown that the effectiveness of the recuperator is increased by 1.5%.

关键词： micro gas turbine recuperator structural optimization numerical simulation

Technological development of multi-energy complementary system based on solar PVs and MGT

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Frontiers in Energy 2018年第4期12卷 509-517页

作者： Xiaojing LV Yu WENG Xiaoyi DING Shilie WENG Yiwu WENG Energy Research Institute School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Investment Consulting Corporation Shanghai 200003China

The complementary micro-energy network system consisting of solar photovoltaic power generation (solar PVs) and micro-gas turbine (MGT), which not only improves the absorption rate and reliability of photovoltaic power, but also has the advantages of low emission, high efficiency, and good fuel adaptability, has become one of the most promising distributed power systems in the field of micro grid. According to the development of current technology and the demand of actual work, this research described the domestic and foreign development of micro-energy network system based on solar PVs and MGT. Moreover, it analyzed the challenges and future development regarding the micro-energy network system in planning and design, energy utilization optimization and dispatching management, and system maintenance, respectively. Furthermore, it predicted the future development of the key technology of the multi-energy complementary system. These results will be beneficial for the progress of this field both in theory and practice.

关键词： renewable energy solar photovoltaic power generation micro gas turbine multi-energy complementary system micro-energy network

A data-driven approach for predicting long-term degradation of a fleet of micro gas turbines

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能源与人工智能(英文)

能源与人工智能(英文) 2021年第2期4卷 30-44页

作者： Tomas Olsson Enislay Ramentol Moksadur Rahman Mark Oostveen Konstantinos Kyprianidis Division Digital Systems Industrial SystemsRISE Research Institutes of SwedenStora Gatan 36Vasteras 72212Sweden Department of Financial Mathematics Fraunhofer Institute for Industrial Mathematics ITWMFraunhofer-Platz 1Kaiserslautern 67663Germany School of Business Society and EngineeringMalardalen UniversityVasteras 72123Sweden micro turbine Technology B.V. Esp 310Eindhoven 5633 AEThe Netherlands

Predictive health monitoring of micro gas turbines can significantly increase the availability and reduce the operating and maintenance costs.Methods for predictive health monitoring are typically developed for large-scale gas turbines and have often focused on single systems.In an effort to enable fleet-level health monitoring of micro gas turbines,this work presents a novel data-driven approach for predicting system degradation over time.The approach utilises operational data from real installations and is not dependent on data from a reference system.The problem was solved in two steps by:1)estimating the degradation from time-dependent variables and 2)forecasting into the future using only running hours.Linear regression technique is employed both for the estimation and forecasting of degradation.The method was evaluated on five different systems and it is shown that the result is consistent(r>0.8)with an existing method that computes corrected values based on data from a reference system,and the forecasting had a similar performance as the estimation model using only running hours as an input.

关键词： Fleet monitoring micro gas turbine Machine learning Health monitoring Predictive maintenance Power generation

Reliability Assessment of microgrid Using Sequential Monte Carlo Simulation

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Journal of Electronic Science and Technology 2011年第1期9卷 31-34页

作者： Lue-Bin Fang Jin-Ding Cai the College of Electrical Engineering and Automation Fuzhou University Fuzhou 350108 China

Sequential Monte Carlo simulation method is introduced to the reliability assessment of microgrid,and a Weibull distribution wind speed model is built to simulate the hourly wind speed of a specific site.Wind turbine generator model combined with a two-state reliability model is applied to Monte Carlo simulation method,and results show that the wind turbine reliability model works well with sequential Monte Carlo simulation.A two-state reliability model of micro gas turbine and a load model from IEEE reliability test system （IEEE RTS） are also introduced to the reliability evaluation of microgrid.Case studies show that Monte Carlo simulation method is flexible and efficient dealing with microgrid consisting of renewable resources with fluctuation characteristics.

关键词： micro gas turbine microgrid MonteCarlo simulation reliability wind turbine.