1,720,973 research outputs found
Comparison of the solid oxide fuel cell system for micro CHP using natural gas with a system using a mixture of natural gas and hydrogen
No full textSolid oxide fuel cell systems for combined heat and power production (SOFC μCHP) fueled by natural gas are attractive because of their high electrical and total efficiency even at small scale. The development of a hydrogen economy will increase the availability of distributed hydrogen as a pure gas. Alternatively, hydrogen may be blended with natural gas in the grid. This study investigates the performance of SOFC μCHP systems, while using a fuel varying from pure hydrogen to pure methane via mixtures of hydrogen and methane called Hythane. Flowsheet models of external as well as internal reforming fuel cell systems were developed in Cycle-Tempo simulation software. Results show that both the external as well as the internal reforming system can operated on all fuel gas compositions varying from pure hydrogen to pure methane, thus allowing for a transition towards a hydrogen economy via the mixing of hydrogen into the natural gas grid. Although the natural gas based systems have a higher electrical efficiency, the introduction of hydrogen into the gas leads to a higher total efficiency of the combined heat and power system. The addition of hydrogen into the fuel minimizes the problems of thermal stress and thermal shock associated with the use of methane in internal reforming fuel cell systems. The internal reforming system showed a higher performance compared to the external reforming system for all Hythane gas mixtures in terms of not only electrical efficiency but also in terms of thermal and total efficiency.Economics of Technology and Innovatio
Gas-fired wind power and electric hydrogen
No full textIn the seemingly endless discussions about the pros and cons of wind power even its advocates have to agree that though wind can fly, with offshore wind farms soon to become reality, this only exacerbates the problem of the winds changeability. Even now the major producers of electricity and power grid companies foresee grave difficulties from the peaks and dips in supply of this green power source. Dr Kas Hemmes of the faculty of Systems Engineering, Policy Analysis, and Management at TU Delft has managed to adapt wind power for use in the current power grid system by combining a fuel cell with a wind turbine, and by better use of the heat released by a fuel cell. Wind turbines will be producing hydrogen after all, albeit mainly from natural gas.Technology, Policy and Managemen
Integrating Wind And Solar With Hydrogen Producing Fuel Cells
No full textThe often proposed solution for the fluctuating wind energy supply is the conversion of the surplus of wind energy into hydrogen by means of electrolysis. In this paper a patented alternative is proposed consisting of the integration of wind turbines with internal reforming fuel-cells, capable of co- producing hydrogen and electricity from natural gas. Storage of hydrogen is not absolutely necessary, since the naturally available energy storage capacity of the gas field is effectively used. The flexibility of a fuel cell to vary electric output and/or simultanuously produce hydrogen from natural gas can be used very beneficial in an integrated windturbine fuel cell configuration. Flowsheet calculations have shown that the change in hydrogen output can be three times or more than the increase in electric input from wind energy at constant natural gas input and constant total electric power output, resulting in an apparent conversion efficiency of more than 300%.Values and TechnologyTechnology, Policy and Managemen
Method for the integrated operation of a fuel cell and an air separator
No full textThe invention relates to a system and method for integrating renewable energy and a fuel cell for the production of electricity and hydrogen, wherein this comprises the use of renewable energy as fluctuating energy source for the production of electricity and also comprises the use of at least one fuel cell, and wherein a control unit controls the operation of the at least one fuel cell such that the total production of electricity lies within chosen limitsCivil Engineering and Geoscience
Method for the production of nitrogen and hydrogen in a fuel cell
No full textThe invention relates to a method for the production of nitrogen and hydrogen in a fuel cell with an anode and a cathode, comprising the steps of inducing a combustion in a fuel cell, wherein a fuel is supplied to the anode, and air is supplied to the cathode, and with oxygen in the air being reduced. According to the invention, nitrogen from the cathodic gas stream is supplied to a natural gas stream whose calorific value and Wobbe Index are higher than a standard calorific value, so as to reduce the calorific value to the standard calorific value.Civil Engineering and Geoscience
System and method for integration of renewable energy and fuel cell for the production of electricity and hydrogen
No full textThe invention relates to a system and method for integrating renewable energy and a fuel cell for the production of electricity and hydrogen, wherein this comprises the use of renewable energy as fluctuating energy source for the production of electricity and also comprises the use of at least one fuel cell, and wherein a control unit controls the operation of the at least one fuel cell such that the total production of electricity lies within chosen limitsCivil Engineering and Geoscience
Method of converting a carbon-comprising material, method of operating a fuel cell stack, and a fuel cell
No full textThe invention relates to a method of converting a carbon-comprising material at elevated temperature in the presence of a molecule that comprises at least one oxygen atom. According to the invention the carbon-comprising material in the fuel cell is converted substantially to carbon monoxide in a reaction with a negative enthalpy ( DELTA H) and a positive entropy change ( DELTA S), heat is supplied to the fuel cell, and at least one of the contributing reactions resulting in the formation of carbon monoxide is an electrochemical reaction producing electricity. This is a more efficient method of converting heat into electricity and at the same time converting the enthalpy of the gasification reaction into electricity.Civil Engineering and Geoscience
Device and method for the transport of energy
No full textThe invention relates to a system, a device and a method for the transport of energy. To this end a conduit is provided for the transport of hydrogen, and a conductor that is in thermal contact with the conduit, for the transport of electricity. The conductor is preferably introduced into the conduit. By partly evaporating the hydrogen in the conduit, the temperature will be lowered considerably to the evapora not tion temperature of hydrogen. By making the conductor of a material that has superconductive properties, it is possible to transport electricity over very great distances without significant ohmic losses.Technology, Policy and Managemen
Towards Zero-Emission Cities: Exploring the pathway of facilitating the zero-emission goal of Amsterdam-Zuidoost district through applying heat pump technologies in existing buildings
No full textThe Master's programme Industrial Ecology is jointly organised by Leiden University and Delft University of Technology.Technology, Policy and ManagementIndustrial Ecolog
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