A lignite-geothermal hybrid power and hydrogen production plant for green cities and sustainable buildings

The worldwide production of hydrogen in 2010 was estimated to be approximately 50 Mt/a, mostly based on fossil fuels. By using lignocellulosic feedstock, an environmentally friendly hydrogen production route can be established. A flow sheet simulation for a biomass based hydrogen production plant was published in a previous work. The plant layout consisted of a dual fluidized bed gasifier including a gas cooler and a dust filter. Subsequently, a water gas shift plant was installed to enhance the hydrogen yield and a biodiesel scrubber was used to remove tars and water from the syngas. CO2 was removed and the gas was compressed to separate hydrogen in a pressure swing adsorption. A steam reformer was used to reform the hydrocarbon-rich tail gas of the pressure swing adsorption and increase the hydrogen yield. Based on this work, a research facility was erected and the results were validated. These results were used to upscale the research plant to a 10 MW fuel feed scale. A validation of the system showed a chemical efficiency of the system of 60% and an overall efficiency of 55%, which indicates the high potential of this technology.

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Effect of plant location on the annual performance of a hydrogen production plant based on CeO2 thermochemical cycle

10.1063/1.5117683 ◽

2019 ◽

Cited By ~ 1

Author(s):

Alicia Bayon ◽

Alberto de la Calle

Keyword(s):

Hydrogen Production ◽

Plant Location ◽

Production Plant ◽

Thermochemical Cycle

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Dispersion and behavior of hydrogen for the safety design of hydrogen production plant attached with nuclear power plant

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2020.04.064 ◽

2020 ◽

Vol 45 (39) ◽

pp. 20250-20255 ◽

Cited By ~ 1

Author(s):

Kai Wang ◽

Xiaojun Zhang ◽

Yang Miao ◽

Baofeng He ◽

Cheng Wang

Keyword(s):

Power Plant ◽

Nuclear Power Plant ◽

Hydrogen Production ◽

Nuclear Power ◽

Production Plant ◽

Safety Design ◽

And Behavior

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Analysis of a High Temperature Gas-Cooled Reactor Powered High Temperature Electrolysis Hydrogen Plant

Volume 5: Energy Systems Analysis, Thermodynamics and Sustainability; NanoEngineering for Energy; Engineering to Address Climate Change, Parts A and B ◽

10.1115/imece2010-40627 ◽

2010 ◽

Author(s):

M. G. McKellar ◽

E. A. Harvego ◽

A. M. Gandrik

Keyword(s):

High Temperature ◽

Hydrogen Production ◽

Economic Analysis ◽

Electric Power ◽

Production Rate ◽

Production Plant ◽

System Pressure ◽

Reference Design ◽

High Temperature Gas ◽

High Temperature Electrolysis

An updated reference design for a commercial-scale high-temperature electrolysis (HTE) plant for hydrogen production has been developed. The HTE plant is powered by a high-temperature gas-cooled reactor (HTGR) whose configuration and operating conditions are based on the latest design parameters planned for the Next Generation Nuclear Plant (NGNP). The current HTGR reference design specifies a reactor power of 600 MWt, with a primary system pressure of 7.0 MPa, and reactor inlet and outlet fluid temperatures of 322°C and 750°C, respectively. The reactor heat is used to produce heat and electric power for the HTE plant. A Rankine steam cycle with a power conversion efficiency of 44.4% was used to provide the electric power. The electrolysis unit used to produce hydrogen includes 1.1 million cells with a per-cell active area of 225 cm2. The reference hydrogen production plant operates at a system pressure of 5.0 MPa, and utilizes a steam-sweep system to remove the excess oxygen that is evolved on the anode (oxygen) side of the electrolyzer. The overall system thermal-to-hydrogen production efficiency (based on the higher heating value of the produced hydrogen) is 42.8% at a hydrogen production rate of 1.85 kg/s (66 million SCFD) and an oxygen production rate of 14.6 kg/s (33 million SCFD). An economic analysis of this plant was performed with realistic financial and cost estimating The results of the economic analysis demonstrated that the HTE hydrogen production plant driven by a high-temperature helium-cooled nuclear power plant can deliver hydrogen at a competitive cost. A cost of $3.03/kg of hydrogen was calculated assuming an internal rate of return of 10% and a debt to equity ratio of 80%/20% for a reactor cost of $2000/kWt and $2.41/kg of hydrogen for a reactor cost of $1400/kWt.

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