The Experts below are selected from a list of 579 Experts worldwide ranked by ideXlab platform

Qinfeng Liang - One of the best experts on this subject based on the ideXlab platform.

  • Experimental and numerical study on slag deposition and growth at the slag tap hole region of Shell Gasifier
    Fuel Processing Technology, 2013
    Co-Authors: Jian Wang, Haifeng Liu, Qinfeng Liang
    Abstract:

    Abstract Cold model experimental and dynamic modeling studies on the slag flow and heat transfer at the slag tap hole region of Shell Gasifier have been carried out. The cold model experiment was set up to observe the simulated slag deposition. The dynamic model was proposed to clarify the slag accumulation on the wall of slag screen. The results show that the simulated slag can be broken up to slender liquid filaments by the high-speed swirling gas flow, and a part of the filaments can deposit on the slag screen wall. When the surface temperature is below the critical temperature, the slag is totally solidified to solid slag layer. At equilibrium, a liquid slag layer covers the solid slag layer and its surface temperature is higher than the critical temperature. The solid slag layer thickness increases along the slag flow. In addition, the solid slag thickness can be decreased by increasing the operating load and operating temperature.

Jian Wang - One of the best experts on this subject based on the ideXlab platform.

  • Experimental and numerical study on slag deposition and growth at the slag tap hole region of Shell Gasifier
    Fuel Processing Technology, 2013
    Co-Authors: Jian Wang, Haifeng Liu, Qinfeng Liang
    Abstract:

    Abstract Cold model experimental and dynamic modeling studies on the slag flow and heat transfer at the slag tap hole region of Shell Gasifier have been carried out. The cold model experiment was set up to observe the simulated slag deposition. The dynamic model was proposed to clarify the slag accumulation on the wall of slag screen. The results show that the simulated slag can be broken up to slender liquid filaments by the high-speed swirling gas flow, and a part of the filaments can deposit on the slag screen wall. When the surface temperature is below the critical temperature, the slag is totally solidified to solid slag layer. At equilibrium, a liquid slag layer covers the solid slag layer and its surface temperature is higher than the critical temperature. The solid slag layer thickness increases along the slag flow. In addition, the solid slag thickness can be decreased by increasing the operating load and operating temperature.

Tian Zhou - One of the best experts on this subject based on the ideXlab platform.

  • Techno-economic analysis of coal-to-liquid processes with different Gasifier alternatives
    Journal of Cleaner Production, 2020
    Co-Authors: Sheng Yang, Zhengyu Xiao, Chengwei Deng, Zhiqiang Liu, Huairong Zhou, Jingzheng Ren, Tian Zhou
    Abstract:

    Abstract Considering the current national conditions of China, developing coal-to-liquid process is an attractive way to alleviate the domestic oil crisis. Coal-to-liquid process mainly includes six subsystems and the most essential unit of the system is the gasification unit. This paper aims to provide suggestions for the cleaner production and sustainable development of coal-to-liquid technology. Lurgi, Texaco, and Shell coal-to-liquid process are modelled and simulated. The techno-economic analysis is conducted to investigate their performance using simulation-based results. Results showed that the greenhouse gas emissions of Lurgi, Texaco, and Shell coal-to-liquid process are 5.26 t/t fuel, 4.86 t/t fuel, and 3.49 t/t fuel. Lurgi coal-to-liquid has better performance on reducing oxygen cost and total investment; Texaco coal-to-liquid is advantageous in saving steam cost and production cost; Shell coal-to-liquid shows better performance in terms of energy efficiency, reducing the consumption of coal and water, and greenhouse gas emission. Shell Gasifier is recommended in water-deficient areas. Texaco Gasifier is recommended when access to water and coal is sufficient. Lurgi Gasifier is recommended in pilot-scale projects. In the view of sustainable development, Shell Gasifier is prior to Texaco Gasifier and Lurgi Gasifier because of the low greenhouse gas emission and well resistance to high coal price and high carbon taxes. Gasification unit occupies the largest proportion of total capital investment of coal-to-liquid processes and significantly affects the syngas composition. Coal gasification technology is potentially limiting the overall acceptance and practice of coal-to-liquid process in the future.

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

  • Experimental and numerical study on slag deposition and growth at the slag tap hole region of Shell Gasifier
    Fuel Processing Technology, 2013
    Co-Authors: Jian Wang, Haifeng Liu, Qinfeng Liang
    Abstract:

    Abstract Cold model experimental and dynamic modeling studies on the slag flow and heat transfer at the slag tap hole region of Shell Gasifier have been carried out. The cold model experiment was set up to observe the simulated slag deposition. The dynamic model was proposed to clarify the slag accumulation on the wall of slag screen. The results show that the simulated slag can be broken up to slender liquid filaments by the high-speed swirling gas flow, and a part of the filaments can deposit on the slag screen wall. When the surface temperature is below the critical temperature, the slag is totally solidified to solid slag layer. At equilibrium, a liquid slag layer covers the solid slag layer and its surface temperature is higher than the critical temperature. The solid slag layer thickness increases along the slag flow. In addition, the solid slag thickness can be decreased by increasing the operating load and operating temperature.

Sheng Yang - One of the best experts on this subject based on the ideXlab platform.

  • Techno-economic analysis of coal-to-liquid processes with different Gasifier alternatives
    Journal of Cleaner Production, 2020
    Co-Authors: Sheng Yang, Zhengyu Xiao, Chengwei Deng, Zhiqiang Liu, Huairong Zhou, Jingzheng Ren, Tian Zhou
    Abstract:

    Abstract Considering the current national conditions of China, developing coal-to-liquid process is an attractive way to alleviate the domestic oil crisis. Coal-to-liquid process mainly includes six subsystems and the most essential unit of the system is the gasification unit. This paper aims to provide suggestions for the cleaner production and sustainable development of coal-to-liquid technology. Lurgi, Texaco, and Shell coal-to-liquid process are modelled and simulated. The techno-economic analysis is conducted to investigate their performance using simulation-based results. Results showed that the greenhouse gas emissions of Lurgi, Texaco, and Shell coal-to-liquid process are 5.26 t/t fuel, 4.86 t/t fuel, and 3.49 t/t fuel. Lurgi coal-to-liquid has better performance on reducing oxygen cost and total investment; Texaco coal-to-liquid is advantageous in saving steam cost and production cost; Shell coal-to-liquid shows better performance in terms of energy efficiency, reducing the consumption of coal and water, and greenhouse gas emission. Shell Gasifier is recommended in water-deficient areas. Texaco Gasifier is recommended when access to water and coal is sufficient. Lurgi Gasifier is recommended in pilot-scale projects. In the view of sustainable development, Shell Gasifier is prior to Texaco Gasifier and Lurgi Gasifier because of the low greenhouse gas emission and well resistance to high coal price and high carbon taxes. Gasification unit occupies the largest proportion of total capital investment of coal-to-liquid processes and significantly affects the syngas composition. Coal gasification technology is potentially limiting the overall acceptance and practice of coal-to-liquid process in the future.