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Manfred Aigner - One of the best experts on this subject based on the ideXlab platform.

  • performance analysis of the micro gas turbine turbec t100 with a new flox Combustion System for low calorific fuels
    Applied Energy, 2015
    Co-Authors: Timo Zornek, Thomas Monz, Manfred Aigner
    Abstract:

    This paper presents the first Combustion System, which has been designed for the use of biomass derived product gases in micro gas turbines. The operating performance of the Combustion System and of the micro gas turbine Turbec T100 was analyzed experimentally with synthetically mixed fuel compositions. Reliable start-up procedures and steady-state operation were observed. The Turbec T100 reached an electrical power output of 50 to 100kWel with a lower heating value of 5.0MJ/kg. Compared to natural gas, the electrical power output was noticeably higher at constant turbine speeds. Therefore, operation was limited by the power electronic at low speeds, while a second limitation was compressor surging at high speeds. To avoid surging, the turbine outlet temperature had to be reduced at turbine speeds between 64,400rpm and its maximum of 70,000rpm. The pressure losses across the FLOX-Combustion chamber remained below 4%, which corresponds to a reduction of 30% compared to the Turbec Combustion chamber fired with natural gas. Low pollutant emissions, i.e. CO<30ppm, NOx<6ppm and unburnt hydrocarbons <1ppm, were obtained over the whole operating range. Further optimization potential of the Turbec T100 was analyzed numerically. Neglecting compressor surging and the limitations of the power electronic, the numerical simulations predicted a maximum power output of 137kWel. The ability of the micro gas turbine to run with low calorific fuels is demonstrated and optimization potential is specified.

  • Performance analysis of the micro gas turbine Turbec T100 with a new FLOX-Combustion System for low calorific fuels
    Applied Energy, 2015
    Co-Authors: Timo Zornek, Thomas Monz, Manfred Aigner
    Abstract:

    This paper presents the first Combustion System, which has been designed for the use of biomass derived product gases in micro gas turbines. The operating performance of the Combustion System and of the micro gas turbine Turbec T100 was analyzed experimentally with synthetically mixed fuel compositions. Reliable start-up procedures and steady-state operation were observed. The Turbec T100 reached an electrical power output of 50 to 100kWel with a lower heating value of 5.0MJ/kg. Compared to natural gas, the electrical power output was noticeably higher at constant turbine speeds. Therefore, operation was limited by the power electronic at low speeds, while a second limitation was compressor surging at high speeds. To avoid surging, the turbine outlet temperature had to be reduced at turbine speeds between 64,400rpm and its maximum of 70,000rpm. The pressure losses across the FLOX-Combustion chamber remained below 4%, which corresponds to a reduction of 30% compared to the Turbec Combustion chamber fired with natural gas. Low pollutant emissions, i.e. CO

Fushui Liu - One of the best experts on this subject based on the ideXlab platform.

  • Combustion and emission characteristics of a lateral swirl Combustion System for di diesel engines under low excess air ratio conditions
    Fuel, 2016
    Co-Authors: Haiqin Zhou, Yanlin Chen, Zhenyang Qiao, Fushui Liu
    Abstract:

    Abstract In order to improve the utilization of air in the cylinder, decrease the thermal load and improve the emission performance of diesel engines, a new lateral swirl Combustion System (LSCS) has been proposed in this study. An experimental investigation of the LSCS at various excess air ratios was conducted using a 132 mm single-cylinder direct injection (DI) engine. The experimental results indicate that, compared to a double swirl Combustion System (DSCS), the LSCS achieves better fuel consumption and lower soot emissions. The fuel consumption was decreased by 4–5 g/(kW h) at each excess air ratio, corresponding to a reduction of about 1.13–2.8%. The decreasing trend of soot formation was also clear, with a significant reduction in the range of 63.4–70.8%. The LSCS also showed excellent performance under an excess air ratio of 1.3–1.6. At an excess air ratio of 1.3, the brake-specific fuel consumption (BSFC) of the LSCS was 228 g/(kW h), the soot emission level was 1.1 Filter Smoke Number (FSN) and the exhaust temperature was about 560 °C. Related numerical research on the impact of in-cylinder fuel/air equivalence ratio, in-cylinder temperature and in-cylinder velocity of the DSCS and the LSCS was performed, and the results show that a large proportion of the fuel/air diffusion was at the bottom of the chamber in the LSCS (away from the cylinder head). The lower concentration of the fuel/air mixture near the cylinder head in the LSCS had a positive effect and reduced the thermal load so that less engine heat was taken away by the cooling water in the water jacket of the cylinder head. Due to the lower thermal load and higher efficiency, the exhaust temperature of the LSCS was higher than that of the DSCS. The higher exhaust temperature had a positive influence on soot oxidation, which caused the soot decrease in the LSCS. It is suggested that the LSCS, with its excellent fuel consumption and low soot emission, has better application prospects in diesel engines, than the DSCS under a low excess air ratio.

  • experimental research on the diffusion flame formation and Combustion performance of forced swirl Combustion System for di diesel engines
    Energy Conversion and Management, 2015
    Co-Authors: Fushui Liu
    Abstract:

    Abstract In order to optimize the fuel/air mixture formation and decrease pollutant emissions of direct injection (DI) diesel engines, a new concept of forced swirl Combustion System (FSCS) included double swirl Combustion System (DSCS) and lateral swirl Combustion System (LSCS) was proposed and implemented by a unique design of the geometric shape of the Combustion chamber. Related numerical research on Combustion and emission characteristics of this new System was conducted and acceptable numerical simulation results about its feasibility were drawn initially. To make a better understanding of the mechanism of fuel/air mixture formation in FSCS, visualization of diffusive flame was conducted in a constant volume vessel. The flame images were captured by a high speed camera and the image results indicated that, compared with the traditional omega Combustion System (OMECS), both of the flame spread space and spread area of FSCS were increased after the spray impingement. Then, fuel economy and emission performance of FSCS were tested in a single cylinder engine to evaluate its application in diesel Combustion System. Test results shown that the LSCS could achieve a better fuel consumption and less soot emission property than DSCS. Both of the two Combustion Systems (LSCS and DSCS) have the promising benefit in fuel consumption and soot emission compared to OMECS. It is suggested that the fuel/air mixing and engine performance could be promoted in FSCS owing to the introduction of swirling Combustion.

  • numerical analysis on the Combustion and emission characteristics of forced swirl Combustion System for di diesel engines
    Energy Conversion and Management, 2014
    Co-Authors: Zheng Zhang, Fushui Liu
    Abstract:

    Abstract To optimize the fuel/air mixture formation and improve the environmental effect of direct injection (DI) diesel engines, a new forced swirl Combustion System (FSCS) was proposed concerned on unique design of the geometric shape of the Combustion chamber. Numerical simulation was conducted to verify the Combustion and emission characteristics of the engines with FSCS. The fuel/air diffusion, in-cylinder velocity distribution, turbulent kinetic energy and in-cylinder temperature distribution were analyzed and the results shown that the FSCS can increase the area of fuel/air diffusion and improve the Combustion. The diesel engine with FSCS also shown excellent performance on emission. At full load condition, the soot emission was significantly reduced for the improved fuel/air mixture formation. There are slightly difference for the soot and NO emission between the FSCS and the traditional omega Combustion System at lower load for the short penetration of the fuel spray.

Timo Zornek - One of the best experts on this subject based on the ideXlab platform.

  • performance analysis of the micro gas turbine turbec t100 with a new flox Combustion System for low calorific fuels
    Applied Energy, 2015
    Co-Authors: Timo Zornek, Thomas Monz, Manfred Aigner
    Abstract:

    This paper presents the first Combustion System, which has been designed for the use of biomass derived product gases in micro gas turbines. The operating performance of the Combustion System and of the micro gas turbine Turbec T100 was analyzed experimentally with synthetically mixed fuel compositions. Reliable start-up procedures and steady-state operation were observed. The Turbec T100 reached an electrical power output of 50 to 100kWel with a lower heating value of 5.0MJ/kg. Compared to natural gas, the electrical power output was noticeably higher at constant turbine speeds. Therefore, operation was limited by the power electronic at low speeds, while a second limitation was compressor surging at high speeds. To avoid surging, the turbine outlet temperature had to be reduced at turbine speeds between 64,400rpm and its maximum of 70,000rpm. The pressure losses across the FLOX-Combustion chamber remained below 4%, which corresponds to a reduction of 30% compared to the Turbec Combustion chamber fired with natural gas. Low pollutant emissions, i.e. CO<30ppm, NOx<6ppm and unburnt hydrocarbons <1ppm, were obtained over the whole operating range. Further optimization potential of the Turbec T100 was analyzed numerically. Neglecting compressor surging and the limitations of the power electronic, the numerical simulations predicted a maximum power output of 137kWel. The ability of the micro gas turbine to run with low calorific fuels is demonstrated and optimization potential is specified.

  • Performance analysis of the micro gas turbine Turbec T100 with a new FLOX-Combustion System for low calorific fuels
    Applied Energy, 2015
    Co-Authors: Timo Zornek, Thomas Monz, Manfred Aigner
    Abstract:

    This paper presents the first Combustion System, which has been designed for the use of biomass derived product gases in micro gas turbines. The operating performance of the Combustion System and of the micro gas turbine Turbec T100 was analyzed experimentally with synthetically mixed fuel compositions. Reliable start-up procedures and steady-state operation were observed. The Turbec T100 reached an electrical power output of 50 to 100kWel with a lower heating value of 5.0MJ/kg. Compared to natural gas, the electrical power output was noticeably higher at constant turbine speeds. Therefore, operation was limited by the power electronic at low speeds, while a second limitation was compressor surging at high speeds. To avoid surging, the turbine outlet temperature had to be reduced at turbine speeds between 64,400rpm and its maximum of 70,000rpm. The pressure losses across the FLOX-Combustion chamber remained below 4%, which corresponds to a reduction of 30% compared to the Turbec Combustion chamber fired with natural gas. Low pollutant emissions, i.e. CO

Thomas Monz - One of the best experts on this subject based on the ideXlab platform.

  • performance analysis of the micro gas turbine turbec t100 with a new flox Combustion System for low calorific fuels
    Applied Energy, 2015
    Co-Authors: Timo Zornek, Thomas Monz, Manfred Aigner
    Abstract:

    This paper presents the first Combustion System, which has been designed for the use of biomass derived product gases in micro gas turbines. The operating performance of the Combustion System and of the micro gas turbine Turbec T100 was analyzed experimentally with synthetically mixed fuel compositions. Reliable start-up procedures and steady-state operation were observed. The Turbec T100 reached an electrical power output of 50 to 100kWel with a lower heating value of 5.0MJ/kg. Compared to natural gas, the electrical power output was noticeably higher at constant turbine speeds. Therefore, operation was limited by the power electronic at low speeds, while a second limitation was compressor surging at high speeds. To avoid surging, the turbine outlet temperature had to be reduced at turbine speeds between 64,400rpm and its maximum of 70,000rpm. The pressure losses across the FLOX-Combustion chamber remained below 4%, which corresponds to a reduction of 30% compared to the Turbec Combustion chamber fired with natural gas. Low pollutant emissions, i.e. CO<30ppm, NOx<6ppm and unburnt hydrocarbons <1ppm, were obtained over the whole operating range. Further optimization potential of the Turbec T100 was analyzed numerically. Neglecting compressor surging and the limitations of the power electronic, the numerical simulations predicted a maximum power output of 137kWel. The ability of the micro gas turbine to run with low calorific fuels is demonstrated and optimization potential is specified.

  • Performance analysis of the micro gas turbine Turbec T100 with a new FLOX-Combustion System for low calorific fuels
    Applied Energy, 2015
    Co-Authors: Timo Zornek, Thomas Monz, Manfred Aigner
    Abstract:

    This paper presents the first Combustion System, which has been designed for the use of biomass derived product gases in micro gas turbines. The operating performance of the Combustion System and of the micro gas turbine Turbec T100 was analyzed experimentally with synthetically mixed fuel compositions. Reliable start-up procedures and steady-state operation were observed. The Turbec T100 reached an electrical power output of 50 to 100kWel with a lower heating value of 5.0MJ/kg. Compared to natural gas, the electrical power output was noticeably higher at constant turbine speeds. Therefore, operation was limited by the power electronic at low speeds, while a second limitation was compressor surging at high speeds. To avoid surging, the turbine outlet temperature had to be reduced at turbine speeds between 64,400rpm and its maximum of 70,000rpm. The pressure losses across the FLOX-Combustion chamber remained below 4%, which corresponds to a reduction of 30% compared to the Turbec Combustion chamber fired with natural gas. Low pollutant emissions, i.e. CO

Fangqin Cheng - One of the best experts on this subject based on the ideXlab platform.

  • numerical simulation and cold experimental research of a low nox Combustion technology for pulverized low volatile coal
    Applied Thermal Engineering, 2017
    Co-Authors: Jing Wang, Kailiang Zheng, Baofeng Wang, Ravinder Singh, Fangqin Cheng
    Abstract:

    Abstract Large quantities of low-volatile coal are utilized in power plants throughout China. With increasingly stringent environmental regulations, it is important to develop and deploy low-NOx Combustion technologies for pulverized coal boilers burning low-volatile coal. The objective of this study was to investigate a novel decoupling Combustion System for low-volatile coal via experiments and computational fluid dynamics (CFD). The Combustion System includes horizontal fuel-rich/lean low-NOx burners (LNB) and the associated air distribution System for a polygonal tangentially fired boiler (PTFB). The effects of coal particle diameter and coal feeding rate on the gas/particle flow characteristics of the burner, and the cold state aerodynamic field of the PTFB were analyzed in detail. The structural design of the LNB results in advantageous gas/particle flow characteristics and the PTFB improved the distribution of the flow field. The CFD models and simulation results were validated by comparing with those of cold experiments data. The simulation results demonstrated that this low-NOx Combustion technology enhances staged Combustion at different scales, which can reduce NOx generation significantly. In the industrial application on a 300 MW pulverized coal boiler, installation of the LNBs improved the stability of low-volatile coal Combustion and reduced NOx emissions significantly. These research findings provide valuable guidance to the design of low-NOx Combustion System for pulverized coal boilers using low volatile coal.