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Akihiro Hayakawa - One of the best experts on this subject based on the ideXlab platform.

  • performances and emission characteristics of nh3 Air and nh3ch4 Air Combustion gas turbine power generations
    Proceedings of the Combustion Institute, 2017
    Co-Authors: Osamu Kurata, Taku Tsujimura, Hirohide Furutani, Hideaki Kobayashi, Takayuki Matsunuma, Takahiro Inoue, Akihiro Hayakawa
    Abstract:

    Abstract For the first time, NH 3 –Air Combustion power generation has been successfully realized using a 50 kW class micro gas turbine system at the National Institute of Advanced Industrial Science and Technology (AIST), Japan. Based on the global demand for carbon-free power generation as well as recent advances involving gas-turbine technologies, such as heat-regenerative cycles, rapid fuel mixing using strong swirling flows, and NO x reduction using selective catalytic reduction (SCR), allow us to realize NH 3 –Air Combustion gas-turbine system, which was abandoned in the 1960′s. In the present system, the combustor adopted gaseous NH 3 fuel and diffusion Combustion to enhance flame stability. The NH 3 pre-cracking apparatus for Combustion enhancement using generated H 2 was not employed. The NH 3 –Air Combustion gas-turbine power generation system can be operated over a wide range of power and rotational speeds, i.e., 18.4 kW to 44.4 kW and 70,000 rpm to 80,000 rpm, respectively. The Combustion efficiency of the NH 3 –Air gas turbine ranged from 89% to 96% at 80,000 rpm. The emission of NO and unburnt NH 3 depends on the combustor inlet temperature. Emission data indicates that there are NH 3 fuel-rich and fuel-lean regions in the primary Combustion zone. It is presumed that unburnt NH 3 is released from the fuel-rich region, while NO is released from the fuel-lean region. When diluted Air enters the secondary Combustion zone, unburnt NH 3 is expected to react with NO through selective non-catalytic reduction (SNCR). NH 3 CH 4 –Air Combustion operation tests were also performed and the results show that the increase of the NH 3 fuel ratio significantly increases the NO emission, whereas it decreases the NO conversion ratio. To achieve low NO x Combustion in NH 3 –Air Combustion gas turbines, it is suggested to burn large quantities of NH 3 fuel and produce both rich and lean fuel mixtures in the primary Combustion zone.

  • performances and emission characteristics of nh3 Air and nh3ch4 Air Combustion gas turbine power generations
    Proceedings of the Combustion Institute, 2017
    Co-Authors: Osamu Kurata, Norihiko Iki, Taku Tsujimura, Hirohide Furutani, Hideaki Kobayashi, Takayuki Matsunuma, Takahiro Inoue, Akihiro Hayakawa
    Abstract:

    Abstract For the first time, NH 3 –Air Combustion power generation has been successfully realized using a 50 kW class micro gas turbine system at the National Institute of Advanced Industrial Science and Technology (AIST), Japan. Based on the global demand for carbon-free power generation as well as recent advances involving gas-turbine technologies, such as heat-regenerative cycles, rapid fuel mixing using strong swirling flows, and NO x reduction using selective catalytic reduction (SCR), allow us to realize NH 3 –Air Combustion gas-turbine system, which was abandoned in the 1960′s. In the present system, the combustor adopted gaseous NH 3 fuel and diffusion Combustion to enhance flame stability. The NH 3 pre-cracking apparatus for Combustion enhancement using generated H 2 was not employed. The NH 3 –Air Combustion gas-turbine power generation system can be operated over a wide range of power and rotational speeds, i.e., 18.4 kW to 44.4 kW and 70,000 rpm to 80,000 rpm, respectively. The Combustion efficiency of the NH 3 –Air gas turbine ranged from 89% to 96% at 80,000 rpm. The emission of NO and unburnt NH 3 depends on the combustor inlet temperature. Emission data indicates that there are NH 3 fuel-rich and fuel-lean regions in the primary Combustion zone. It is presumed that unburnt NH 3 is released from the fuel-rich region, while NO is released from the fuel-lean region. When diluted Air enters the secondary Combustion zone, unburnt NH 3 is expected to react with NO through selective non-catalytic reduction (SNCR). NH 3 CH 4 –Air Combustion operation tests were also performed and the results show that the increase of the NH 3 fuel ratio significantly increases the NO emission, whereas it decreases the NO conversion ratio. To achieve low NO x Combustion in NH 3 –Air Combustion gas turbines, it is suggested to burn large quantities of NH 3 fuel and produce both rich and lean fuel mixtures in the primary Combustion zone.

Osamu Kurata - One of the best experts on this subject based on the ideXlab platform.

  • performances and emission characteristics of nh3 Air and nh3ch4 Air Combustion gas turbine power generations
    Proceedings of the Combustion Institute, 2017
    Co-Authors: Osamu Kurata, Taku Tsujimura, Hirohide Furutani, Hideaki Kobayashi, Takayuki Matsunuma, Takahiro Inoue, Akihiro Hayakawa
    Abstract:

    Abstract For the first time, NH 3 –Air Combustion power generation has been successfully realized using a 50 kW class micro gas turbine system at the National Institute of Advanced Industrial Science and Technology (AIST), Japan. Based on the global demand for carbon-free power generation as well as recent advances involving gas-turbine technologies, such as heat-regenerative cycles, rapid fuel mixing using strong swirling flows, and NO x reduction using selective catalytic reduction (SCR), allow us to realize NH 3 –Air Combustion gas-turbine system, which was abandoned in the 1960′s. In the present system, the combustor adopted gaseous NH 3 fuel and diffusion Combustion to enhance flame stability. The NH 3 pre-cracking apparatus for Combustion enhancement using generated H 2 was not employed. The NH 3 –Air Combustion gas-turbine power generation system can be operated over a wide range of power and rotational speeds, i.e., 18.4 kW to 44.4 kW and 70,000 rpm to 80,000 rpm, respectively. The Combustion efficiency of the NH 3 –Air gas turbine ranged from 89% to 96% at 80,000 rpm. The emission of NO and unburnt NH 3 depends on the combustor inlet temperature. Emission data indicates that there are NH 3 fuel-rich and fuel-lean regions in the primary Combustion zone. It is presumed that unburnt NH 3 is released from the fuel-rich region, while NO is released from the fuel-lean region. When diluted Air enters the secondary Combustion zone, unburnt NH 3 is expected to react with NO through selective non-catalytic reduction (SNCR). NH 3 CH 4 –Air Combustion operation tests were also performed and the results show that the increase of the NH 3 fuel ratio significantly increases the NO emission, whereas it decreases the NO conversion ratio. To achieve low NO x Combustion in NH 3 –Air Combustion gas turbines, it is suggested to burn large quantities of NH 3 fuel and produce both rich and lean fuel mixtures in the primary Combustion zone.

  • performances and emission characteristics of nh3 Air and nh3ch4 Air Combustion gas turbine power generations
    Proceedings of the Combustion Institute, 2017
    Co-Authors: Osamu Kurata, Norihiko Iki, Taku Tsujimura, Hirohide Furutani, Hideaki Kobayashi, Takayuki Matsunuma, Takahiro Inoue, Akihiro Hayakawa
    Abstract:

    Abstract For the first time, NH 3 –Air Combustion power generation has been successfully realized using a 50 kW class micro gas turbine system at the National Institute of Advanced Industrial Science and Technology (AIST), Japan. Based on the global demand for carbon-free power generation as well as recent advances involving gas-turbine technologies, such as heat-regenerative cycles, rapid fuel mixing using strong swirling flows, and NO x reduction using selective catalytic reduction (SCR), allow us to realize NH 3 –Air Combustion gas-turbine system, which was abandoned in the 1960′s. In the present system, the combustor adopted gaseous NH 3 fuel and diffusion Combustion to enhance flame stability. The NH 3 pre-cracking apparatus for Combustion enhancement using generated H 2 was not employed. The NH 3 –Air Combustion gas-turbine power generation system can be operated over a wide range of power and rotational speeds, i.e., 18.4 kW to 44.4 kW and 70,000 rpm to 80,000 rpm, respectively. The Combustion efficiency of the NH 3 –Air gas turbine ranged from 89% to 96% at 80,000 rpm. The emission of NO and unburnt NH 3 depends on the combustor inlet temperature. Emission data indicates that there are NH 3 fuel-rich and fuel-lean regions in the primary Combustion zone. It is presumed that unburnt NH 3 is released from the fuel-rich region, while NO is released from the fuel-lean region. When diluted Air enters the secondary Combustion zone, unburnt NH 3 is expected to react with NO through selective non-catalytic reduction (SNCR). NH 3 CH 4 –Air Combustion operation tests were also performed and the results show that the increase of the NH 3 fuel ratio significantly increases the NO emission, whereas it decreases the NO conversion ratio. To achieve low NO x Combustion in NH 3 –Air Combustion gas turbines, it is suggested to burn large quantities of NH 3 fuel and produce both rich and lean fuel mixtures in the primary Combustion zone.

Olivier Thomine - One of the best experts on this subject based on the ideXlab platform.

  • numerical study on laminar flame velocity of hydrogen Air Combustion under water spray effects
    International Journal of Hydrogen Energy, 2019
    Co-Authors: S Kudriakov, Bernd Rogg, E Studer, Ahmed Hadjadj, Olivier Thomine
    Abstract:

    Abstract In the context of hydrogen safety and explosions in hydrogen-oxygen systems, numerical simulations of laminar, premixed, hydrogen/Air flames propagating freely into a spray of liquid water are carried out. The effects on the flame velocity of hydrogen/Air flames of droplet size, liquid-water volume fraction, and mixture composition are numerically investigated. In particular, an effective reduction of the flame velocity is shown to occur through the influence of water spray. To complement and extend the numerical results and the only scarcely available experimental results, a “Laminar Flame Velocity under Droplet Evaporation Model” (LVDEM) based on an energy balance of the overall spray-flame system is developed and proposed. It is shown that the estimation of laminar flame velocities obtained using the LVDEM model generally agrees well with the experimental and numerical data.

  • numerical study on laminar flame velocity of hydrogen Air Combustion under water spray effects
    International Journal of Hydrogen Energy, 2019
    Co-Authors: S Kudriakov, Bernd Rogg, E Studer, Ahmed Hadjadj, Olivier Thomine
    Abstract:

    Abstract In the context of hydrogen safety and explosions in hydrogen-oxygen systems, numerical simulations of laminar, premixed, hydrogen/Air flames propagating freely into a spray of liquid water are carried out. The effects on the flame velocity of hydrogen/Air flames of droplet size, liquid-water volume fraction, and mixture composition are numerically investigated. In particular, an effective reduction of the flame velocity is shown to occur through the influence of water spray. To complement and extend the numerical results and the only scarcely available experimental results, a “Laminar Flame Velocity under Droplet Evaporation Model” (LVDEM) based on an energy balance of the overall spray-flame system is developed and proposed. It is shown that the estimation of laminar flame velocities obtained using the LVDEM model generally agrees well with the experimental and numerical data.

Takahiro Inoue - One of the best experts on this subject based on the ideXlab platform.

  • performances and emission characteristics of nh3 Air and nh3ch4 Air Combustion gas turbine power generations
    Proceedings of the Combustion Institute, 2017
    Co-Authors: Osamu Kurata, Taku Tsujimura, Hirohide Furutani, Hideaki Kobayashi, Takayuki Matsunuma, Takahiro Inoue, Akihiro Hayakawa
    Abstract:

    Abstract For the first time, NH 3 –Air Combustion power generation has been successfully realized using a 50 kW class micro gas turbine system at the National Institute of Advanced Industrial Science and Technology (AIST), Japan. Based on the global demand for carbon-free power generation as well as recent advances involving gas-turbine technologies, such as heat-regenerative cycles, rapid fuel mixing using strong swirling flows, and NO x reduction using selective catalytic reduction (SCR), allow us to realize NH 3 –Air Combustion gas-turbine system, which was abandoned in the 1960′s. In the present system, the combustor adopted gaseous NH 3 fuel and diffusion Combustion to enhance flame stability. The NH 3 pre-cracking apparatus for Combustion enhancement using generated H 2 was not employed. The NH 3 –Air Combustion gas-turbine power generation system can be operated over a wide range of power and rotational speeds, i.e., 18.4 kW to 44.4 kW and 70,000 rpm to 80,000 rpm, respectively. The Combustion efficiency of the NH 3 –Air gas turbine ranged from 89% to 96% at 80,000 rpm. The emission of NO and unburnt NH 3 depends on the combustor inlet temperature. Emission data indicates that there are NH 3 fuel-rich and fuel-lean regions in the primary Combustion zone. It is presumed that unburnt NH 3 is released from the fuel-rich region, while NO is released from the fuel-lean region. When diluted Air enters the secondary Combustion zone, unburnt NH 3 is expected to react with NO through selective non-catalytic reduction (SNCR). NH 3 CH 4 –Air Combustion operation tests were also performed and the results show that the increase of the NH 3 fuel ratio significantly increases the NO emission, whereas it decreases the NO conversion ratio. To achieve low NO x Combustion in NH 3 –Air Combustion gas turbines, it is suggested to burn large quantities of NH 3 fuel and produce both rich and lean fuel mixtures in the primary Combustion zone.

  • performances and emission characteristics of nh3 Air and nh3ch4 Air Combustion gas turbine power generations
    Proceedings of the Combustion Institute, 2017
    Co-Authors: Osamu Kurata, Norihiko Iki, Taku Tsujimura, Hirohide Furutani, Hideaki Kobayashi, Takayuki Matsunuma, Takahiro Inoue, Akihiro Hayakawa
    Abstract:

    Abstract For the first time, NH 3 –Air Combustion power generation has been successfully realized using a 50 kW class micro gas turbine system at the National Institute of Advanced Industrial Science and Technology (AIST), Japan. Based on the global demand for carbon-free power generation as well as recent advances involving gas-turbine technologies, such as heat-regenerative cycles, rapid fuel mixing using strong swirling flows, and NO x reduction using selective catalytic reduction (SCR), allow us to realize NH 3 –Air Combustion gas-turbine system, which was abandoned in the 1960′s. In the present system, the combustor adopted gaseous NH 3 fuel and diffusion Combustion to enhance flame stability. The NH 3 pre-cracking apparatus for Combustion enhancement using generated H 2 was not employed. The NH 3 –Air Combustion gas-turbine power generation system can be operated over a wide range of power and rotational speeds, i.e., 18.4 kW to 44.4 kW and 70,000 rpm to 80,000 rpm, respectively. The Combustion efficiency of the NH 3 –Air gas turbine ranged from 89% to 96% at 80,000 rpm. The emission of NO and unburnt NH 3 depends on the combustor inlet temperature. Emission data indicates that there are NH 3 fuel-rich and fuel-lean regions in the primary Combustion zone. It is presumed that unburnt NH 3 is released from the fuel-rich region, while NO is released from the fuel-lean region. When diluted Air enters the secondary Combustion zone, unburnt NH 3 is expected to react with NO through selective non-catalytic reduction (SNCR). NH 3 CH 4 –Air Combustion operation tests were also performed and the results show that the increase of the NH 3 fuel ratio significantly increases the NO emission, whereas it decreases the NO conversion ratio. To achieve low NO x Combustion in NH 3 –Air Combustion gas turbines, it is suggested to burn large quantities of NH 3 fuel and produce both rich and lean fuel mixtures in the primary Combustion zone.

Takayuki Matsunuma - One of the best experts on this subject based on the ideXlab platform.

  • performances and emission characteristics of nh3 Air and nh3ch4 Air Combustion gas turbine power generations
    Proceedings of the Combustion Institute, 2017
    Co-Authors: Osamu Kurata, Taku Tsujimura, Hirohide Furutani, Hideaki Kobayashi, Takayuki Matsunuma, Takahiro Inoue, Akihiro Hayakawa
    Abstract:

    Abstract For the first time, NH 3 –Air Combustion power generation has been successfully realized using a 50 kW class micro gas turbine system at the National Institute of Advanced Industrial Science and Technology (AIST), Japan. Based on the global demand for carbon-free power generation as well as recent advances involving gas-turbine technologies, such as heat-regenerative cycles, rapid fuel mixing using strong swirling flows, and NO x reduction using selective catalytic reduction (SCR), allow us to realize NH 3 –Air Combustion gas-turbine system, which was abandoned in the 1960′s. In the present system, the combustor adopted gaseous NH 3 fuel and diffusion Combustion to enhance flame stability. The NH 3 pre-cracking apparatus for Combustion enhancement using generated H 2 was not employed. The NH 3 –Air Combustion gas-turbine power generation system can be operated over a wide range of power and rotational speeds, i.e., 18.4 kW to 44.4 kW and 70,000 rpm to 80,000 rpm, respectively. The Combustion efficiency of the NH 3 –Air gas turbine ranged from 89% to 96% at 80,000 rpm. The emission of NO and unburnt NH 3 depends on the combustor inlet temperature. Emission data indicates that there are NH 3 fuel-rich and fuel-lean regions in the primary Combustion zone. It is presumed that unburnt NH 3 is released from the fuel-rich region, while NO is released from the fuel-lean region. When diluted Air enters the secondary Combustion zone, unburnt NH 3 is expected to react with NO through selective non-catalytic reduction (SNCR). NH 3 CH 4 –Air Combustion operation tests were also performed and the results show that the increase of the NH 3 fuel ratio significantly increases the NO emission, whereas it decreases the NO conversion ratio. To achieve low NO x Combustion in NH 3 –Air Combustion gas turbines, it is suggested to burn large quantities of NH 3 fuel and produce both rich and lean fuel mixtures in the primary Combustion zone.

  • performances and emission characteristics of nh3 Air and nh3ch4 Air Combustion gas turbine power generations
    Proceedings of the Combustion Institute, 2017
    Co-Authors: Osamu Kurata, Norihiko Iki, Taku Tsujimura, Hirohide Furutani, Hideaki Kobayashi, Takayuki Matsunuma, Takahiro Inoue, Akihiro Hayakawa
    Abstract:

    Abstract For the first time, NH 3 –Air Combustion power generation has been successfully realized using a 50 kW class micro gas turbine system at the National Institute of Advanced Industrial Science and Technology (AIST), Japan. Based on the global demand for carbon-free power generation as well as recent advances involving gas-turbine technologies, such as heat-regenerative cycles, rapid fuel mixing using strong swirling flows, and NO x reduction using selective catalytic reduction (SCR), allow us to realize NH 3 –Air Combustion gas-turbine system, which was abandoned in the 1960′s. In the present system, the combustor adopted gaseous NH 3 fuel and diffusion Combustion to enhance flame stability. The NH 3 pre-cracking apparatus for Combustion enhancement using generated H 2 was not employed. The NH 3 –Air Combustion gas-turbine power generation system can be operated over a wide range of power and rotational speeds, i.e., 18.4 kW to 44.4 kW and 70,000 rpm to 80,000 rpm, respectively. The Combustion efficiency of the NH 3 –Air gas turbine ranged from 89% to 96% at 80,000 rpm. The emission of NO and unburnt NH 3 depends on the combustor inlet temperature. Emission data indicates that there are NH 3 fuel-rich and fuel-lean regions in the primary Combustion zone. It is presumed that unburnt NH 3 is released from the fuel-rich region, while NO is released from the fuel-lean region. When diluted Air enters the secondary Combustion zone, unburnt NH 3 is expected to react with NO through selective non-catalytic reduction (SNCR). NH 3 CH 4 –Air Combustion operation tests were also performed and the results show that the increase of the NH 3 fuel ratio significantly increases the NO emission, whereas it decreases the NO conversion ratio. To achieve low NO x Combustion in NH 3 –Air Combustion gas turbines, it is suggested to burn large quantities of NH 3 fuel and produce both rich and lean fuel mixtures in the primary Combustion zone.