The Experts below are selected from a list of 4563 Experts worldwide ranked by ideXlab platform

V. Prabu - One of the best experts on this subject based on the ideXlab platform.

  • co2 enhanced in situ oxy Coal gasification based carbon neutral conventional power generating systems
    Energy, 2015
    Co-Authors: V. Prabu, K Geeta
    Abstract:

    Abstract UCG (Underground Coal gasification) is an economic and a viable in-situ Clean Coal Technology in exploiting deep underground Coal resources. Sustaining a combustion front in the in-situ gasification of high ash Coal is difficult if steam acts as a gasifying medium. In addition, the use of superheated steam causes the transportation problem for deep Coal seam. Conversely, these problems could be avoided if CO 2 is used as the gasifying medium. In order to implement a CCS ready system in existing plants, the present study investigates the feasibility of integration of CO 2 /O 2 gasification of in-situ Coal with conventional power generating systems such as steam turbine and combined cycle power plants performing in a CO 2 /O 2 mode of combustion. The effect of operating pressure and the ratio of CO 2 /O 2 input to an UCG system on the net thermal efficiency of the IGCC system are evaluated. A detailed energy analysis of the CO 2 enhanced IUGCC (UCG integrated with the combined cycle) shows a high net thermal efficiency of 41% with CCS (carbon capture and storage) at the UCG operating pressure of 27 bar. IUGST (Integration of low pressure UCG with a steam turbine cycle) system shows a net thermal efficiency of 27% with CCS.

  • Integration of in-situ CO2-oxy Coal gasification with advanced power generating systems performing in a chemical looping approach of Clean combustion
    Applied Energy, 2015
    Co-Authors: V. Prabu
    Abstract:

    Underground Coal gasification (UCG) is a Clean Coal Technology to utilize deep Coal resources effectively. In-situ CO2-oxy Coal gasification may eliminate the operational difficulty of the steam gasification process and utilize CO2 (greenhouse gas) effectively. Furthermore, it is necessary to convert the Clean gasified energy from the UCG into Clean combustion energy for an end-use. In order to achieve efficient Clean power production, the present work investigates the thermodynamic feasibility of integration of CO2 based UCG with power generating systems operating in a chemical looping combustion (CLC) of product gas. The use of CO enriched syngas from O2/CO2 based UCG reduces the difficulty of the heat balance between a fuel reactor and an air reactor in a nickel oxygen-carrier based CLC system. Thermodynamic analyses have been made for various routes of power generation systems such as subcritical, supercritical and ultra-supercritical boiler based steam turbines and gas turbines for the UCG integrated system. It is shown, based on mass and energy balance analysis, that the integration of CO2 based UCG with the CLC system reduces the energy penalty of carbon capture and storage (CCS) significantly. A net thermal efficiency of 29.42% is estimated for the CCS incorporated system, which operates in a subcritical condition based steam turbine power plant. Furthermore, it is found that the efficiency of the proposed steam turbine system increases to 35.40% for an ultra-supercritical operating condition. The effect of operating temperature of the air reactor and the fuel reactor of the CLC system on the net thermal efficiency of combined cycle power plant is investigated. It is found that a net thermal efficiency of 42.53% can be obtained for the CCS incorporated combined cycle power system operating at an air reactor temperature of 1200°C.

  • integration of underground Coal gasification with a solid oxide fuel cell system for Clean Coal utilization
    International Journal of Hydrogen Energy, 2012
    Co-Authors: V. Prabu, S Jayanti
    Abstract:

    Abstract Underground Coal gasification (UCG) is a promising Clean Coal Technology. Typically, the syngas obtained from UCG is used for power generation via the steam turbine route. In the present paper, we consider UCG as a hydrogen generator and investigate the possibility of coupling it with a solid oxide fuel cell (SOFC) to generate electrical power directly. We show, through analysis, that integration with SOFC gives two specific advantages. Firstly, because of the high operating temperature of the SOFC, its anode exhaust can be used to produce steam required for the operation of UCG as well as for the reforming of the syngas for the SOFC. Secondly, the SOFC serves as a selective absorber of oxygen from air which paves the way for an efficient system of a carbon-neutral electrical power generation from underground Coal. Thermodynamic analysis of the integrated system shows considerable improvement in the net thermal efficiency over that of a conventional combined cycle plant.

Yilun Chang - One of the best experts on this subject based on the ideXlab platform.

  • Clean Coal Technology on hot gas Clean up process with a moving granular bed filter
    Fuel, 2019
    Co-Authors: Yishun Chen, Shu-san Hsiau, Jhanruei Syu, Yilun Chang
    Abstract:

    Abstract This study presents a filtration Technology, aiming to increase the efficiency of industry environment under different integrations and acquire the optimum solution. The goal of this study is to evaluate the performance of a moving granular bed filter designed to filter out Coal fly ash. A series of experiments were performed at room temperature to demonstrate the flow patterns of the moving granular bed filter under different operational parameters. The collection efficiency and the pressure drop were investigated under different filtration superficial velocities, mass flow rates of filter granules, and filter granules, but with a fixed inlet dust concentration. The results showed that, using a filtration superficial velocity of 20 cm/s and a mass flow rate of filter granules of 460 g/min, the outlet dust weight decreased and the amount of dust particulates deposited in the filter bed increased. Furthermore, the test results from this filtration method can be applied in different industrial applications with high-temperature environments.

Yishun Chen - One of the best experts on this subject based on the ideXlab platform.

  • Clean Coal Technology on hot gas Clean up process with a moving granular bed filter
    Fuel, 2019
    Co-Authors: Yishun Chen, Shu-san Hsiau, Jhanruei Syu, Yilun Chang
    Abstract:

    Abstract This study presents a filtration Technology, aiming to increase the efficiency of industry environment under different integrations and acquire the optimum solution. The goal of this study is to evaluate the performance of a moving granular bed filter designed to filter out Coal fly ash. A series of experiments were performed at room temperature to demonstrate the flow patterns of the moving granular bed filter under different operational parameters. The collection efficiency and the pressure drop were investigated under different filtration superficial velocities, mass flow rates of filter granules, and filter granules, but with a fixed inlet dust concentration. The results showed that, using a filtration superficial velocity of 20 cm/s and a mass flow rate of filter granules of 460 g/min, the outlet dust weight decreased and the amount of dust particulates deposited in the filter bed increased. Furthermore, the test results from this filtration method can be applied in different industrial applications with high-temperature environments.

  • Clean Coal Technology for removal dust using moving granular bed filter
    Energy, 2017
    Co-Authors: Yishun Chen, Chiajen Hsu, Shu-san Hsiau
    Abstract:

    Abstract An international joint research project into advanced hot gas Cleaning in high-efficiency Coal and solid waste power generation processes using a granular bed filter has been developed. The goal of this study is to evaluate the filtration performance of a moving granular bed with baffle designs. A series of experiments are performed at room temperature to demonstrate the flow patterns of filtration Technology (i.e., the moving granular bed filter) under different operational parameters. Pressure drops and collection efficiency are measured as performance indices and analyzed through a series tests. The important parameters taken into consideration include the mass flow rates of filter granules and filtration superficial velocities. The experimental results show that the best collection efficiency is 99.87%, which is obtained using a baffle, a mass flow rate of the filter media of 600 g/min, and a filtration superficial velocity of 40 cm/s. Furthermore, the test results from this new method can be applied to moving granular bed filters or other filtration systems for a high-temperature environment of industry.

Jhuma Sadhukhan - One of the best experts on this subject based on the ideXlab platform.

  • Decarbonised Coal energy system advancement through CO2 utilisation and polygeneration
    Clean Technologies and Environmental Policy, 2011
    Co-Authors: Kok Siew Ng, Nan Zhang, Jhuma Sadhukhan
    Abstract:

    Development of Clean Coal Technology is highly envisaged to mitigate the CO2 emission level whilst meeting the rising global energy demands which require highly efficient and economically compelling Technology. Integrated gasification combined cycle (IGCC) with carbon capture and storage (CCS) system is highly efficient and Cleaner compared to the conventional Coal-fired power plant. In this study, an alternative process scheme for IGCC system has been proposed, which encompasses the reuse of CO2 from the flue gas of gas turbine into syngas generation, followed by methanol synthesis. The thermodynamic efficiency and economic potential are evaluated and compared for these two systems. The performances of the systems have been enhanced through systematic energy integration strategies. It has been found that the thermodynamic and economic feasibilities have attained significant improvement through the realisation of a suitably balanced polygeneration scheme. The economic potential can be enhanced from negative impact to 317 M€/y (3.6 €/GJ). The results have demonstrated promising prospects of employing CO2 reuse Technology into IGCC system, as an alternative to CCS system.

Shu-san Hsiau - One of the best experts on this subject based on the ideXlab platform.

  • Clean Coal Technology on hot gas Clean up process with a moving granular bed filter
    Fuel, 2019
    Co-Authors: Yishun Chen, Shu-san Hsiau, Jhanruei Syu, Yilun Chang
    Abstract:

    Abstract This study presents a filtration Technology, aiming to increase the efficiency of industry environment under different integrations and acquire the optimum solution. The goal of this study is to evaluate the performance of a moving granular bed filter designed to filter out Coal fly ash. A series of experiments were performed at room temperature to demonstrate the flow patterns of the moving granular bed filter under different operational parameters. The collection efficiency and the pressure drop were investigated under different filtration superficial velocities, mass flow rates of filter granules, and filter granules, but with a fixed inlet dust concentration. The results showed that, using a filtration superficial velocity of 20 cm/s and a mass flow rate of filter granules of 460 g/min, the outlet dust weight decreased and the amount of dust particulates deposited in the filter bed increased. Furthermore, the test results from this filtration method can be applied in different industrial applications with high-temperature environments.

  • Clean Coal Technology for removal dust using moving granular bed filter
    Energy, 2017
    Co-Authors: Yishun Chen, Chiajen Hsu, Shu-san Hsiau
    Abstract:

    Abstract An international joint research project into advanced hot gas Cleaning in high-efficiency Coal and solid waste power generation processes using a granular bed filter has been developed. The goal of this study is to evaluate the filtration performance of a moving granular bed with baffle designs. A series of experiments are performed at room temperature to demonstrate the flow patterns of filtration Technology (i.e., the moving granular bed filter) under different operational parameters. Pressure drops and collection efficiency are measured as performance indices and analyzed through a series tests. The important parameters taken into consideration include the mass flow rates of filter granules and filtration superficial velocities. The experimental results show that the best collection efficiency is 99.87%, which is obtained using a baffle, a mass flow rate of the filter media of 600 g/min, and a filtration superficial velocity of 40 cm/s. Furthermore, the test results from this new method can be applied to moving granular bed filters or other filtration systems for a high-temperature environment of industry.