Heat to H2:Using Waste Heat to Set Up Concentration Differences for Reverse Electrodialysis Hydrogen Production

The ohmic resistances of the anion and cation ion-exchange membranes (IEMs) that constitute a reverse electrodialysis system (RED) are of crucial importance for its performance. In this work, we study the influence of concentration (0.1 M, 0.5 M, 1 M and 2 M) of ammonium bicarbonate solutions on the ohmic resistances of ten commercial IEMs. We also studied the ohmic resistance at elevated temperature 313 K. Measurements have been performed with a direct two-electrode electrochemical impedance spectroscopy (EIS) method. As the ohmic resistance of the IEMs depends linearly on the membrane thickness, we measured the impedance for three different layered thicknesses, and the results were normalised. To gauge the role of the membrane resistances in the use of RED for production of hydrogen by use of waste heat, we used a thermodynamic and an economic model to study the impact of the ohmic resistance of the IEMs on hydrogen production rate, waste heat required, thermochemical conversion efficiency and the levelised cost of hydrogen. The highest performance was achieved with a stack made of FAS30 and CSO Type IEMs, producing hydrogen at 8.48× 10−7 kg mmem−2s−1 with a waste heat requirement of 344 kWh kg−1 hydrogen. This yielded an operating efficiency of 9.7% and a levelised cost of 7.80 € kgH2−1.

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Thermochemical waste-heat recuperation as on-board hydrogen production technology

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2020.11.108 ◽

2020 ◽

Author(s):

Dmitry Pashchenko

Keyword(s):

Hydrogen Production ◽

Production Technology ◽

Waste Heat ◽

Heat Recuperation ◽

Waste Heat Recuperation

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Effects of particle sizes on performances of the horizontally buried-pipe steam generator using waste heat in a bioethanol steam reforming hydrogen production system

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2019.09.244 ◽

2020 ◽

Vol 45 (39) ◽

pp. 20216-20222 ◽

Cited By ~ 1

Author(s):

Bin Zheng ◽

Peng Sun ◽

Yongqi Liu ◽

Jian Meng ◽

Youtang Wang ◽

...

Keyword(s):

Hydrogen Production ◽

Steam Generator ◽

Steam Reforming ◽

Production System ◽

Waste Heat ◽

Particle Sizes ◽

Buried Pipe

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A System Analysis of Pressurized Electrolysis for Compressed Hydrogen Production

ASME 2019 13th International Conference on Energy Sustainability ◽

10.1115/es2019-3908 ◽

2019 ◽

Author(s):

Ryan T. Hamilton ◽

Dustin McLarty

Keyword(s):

Hydrogen Production ◽

System Analysis ◽

High Pressures ◽

Waste Heat ◽

Water Electrolysis ◽

Plant Performance ◽

Pressurized Water ◽

Production Of Hydrogen ◽

Hydrogen Compression ◽

Plant Efficiency

Abstract Renewable production of hydrogen offers a clean and sustainable replacement of fossil fuels. As an energy carrier hydrogen is compressed and stored at high pressures. Pressurized water electrolysis improves plant performance as hydrogen compression is an energy intensive process. This work analyzes hydrogen production over the temperature range of 100°C to 800°C and pressure range of 1 bar to 700 bar. The sensitivity of plant efficiency to hydrogen compression technology and waste heat recovery is investigated. This study reveals that a lower-heating-value electric energy efficiency of 84% can be achieved when pressurized electrolysis avoids the inefficiencies of hydrogen compression. With the availability of high-quality waste heat plant efficiency can reach 98% for a pipeline distribution scenario at 3MPa. When no waste heat is available plant efficiency is independent of electrolysis temperature. For hydrogen use in the transportation sector, pressurized supercritical water electrolysis at 800°C has the potential to improve plant efficiency by 14% from a baseline of non-pressurized electrolysis at 800°C.

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Effects of fin structure size on methane-steam reforming for hydrogen production in a reactor heated by waste heat

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2019.10.143 ◽

2020 ◽

Vol 45 (39) ◽

pp. 20465-20471

Author(s):

Bin Zheng ◽

Peng Sun ◽

Jian Meng ◽

Yongqi Liu ◽

Geoff Wang ◽

...

Keyword(s):

Hydrogen Production ◽

Steam Reforming ◽

Waste Heat ◽

Methane Steam Reforming ◽

Methane Steam

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Fabrication and performance analysis of concentrated hybrid photovoltaic system

MATEC Web of Conferences ◽

10.1051/matecconf/201814404023 ◽

2018 ◽

Vol 144 ◽

pp. 04023

Author(s):

Krishna Murthy ◽

Ajay Daniel ◽

Lanvin Concessao ◽

Habbie Alex Roy ◽

A. Ganesha

Keyword(s):

Solar Radiation ◽

Waste Heat ◽

Cooling System ◽

Photovoltaic System ◽

Photovoltaic Module ◽

Performance Study ◽

Drastic Increase ◽

Concentrated Solar Radiation ◽

And Performance ◽

Set Up

Sun is the most important source of renewable source of energy. During the past few decades there has been an ever-increasing interest in Photovoltaic (PV) cells as it directly converts solar radiation into electricity. This paper involves the performance study of photovoltaic system under concentrated solar radiation. The main problem with the concentration solar energy is the drastic increase in temperature of the photovoltaic module resulting in a decrease in performance efficiency of the system. This problem of overheating of the system can be overcome by providing cooling which would ensure operation of the module in the optimal temperature range. Hence, the setup would function as a hybrid model serving the dual purpose of power generation while also utilizing the waste heat for water heating applications. The experimental set up consist of a novel arrangement of concentrator and reflector and the cooling system. The Hybrid Photovoltaic System was repeatedly tested under real time conditions on several days. A comparison was drawn between the results obtained from direct exposure of a standard photovoltaic module to that obtained from the hybrid system in order to better understand the improvement in performance parameters. The study shown a significant improvement of output of standard photovoltaic module under the concentrated solar radiation.

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Exergy, economic, and optimization of a clean hydrogen production system using waste heat of a steel production factory

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2021.07.208 ◽

2021 ◽

Author(s):

Ma Shaofu ◽

Ehab Hussein Bani Hani ◽

Hai Tao ◽

Qiang Xu

Keyword(s):

Hydrogen Production ◽

Production System ◽

Waste Heat ◽

Steel Production

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To Gain the Burning Efficiency by Improving the Mixing Condition of Oil and Gas

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.361-363.861 ◽

2011 ◽

Vol 361-363 ◽

pp. 861-864

Author(s):

Yen Kuei Tseng

Keyword(s):

Turbulent Flow ◽

Energy Saving ◽

High Speed ◽

Oil And Gas ◽

Waste Heat ◽

Energy Deficit ◽

Mixing Condition ◽

Environment Impact ◽

Reduce Emissions ◽

Set Up

In this research, the burner used in current industry is modified to improve the state of mixture for air and oil, so that the burning efficiency could be promoted to save fuel as well as reduce emissions of waste gas and waste heat. The way of operating this modified burner was same as the traditional one by inducing the air and oil with high pressure to the furnace, then mixing and burning the compound inside the chamber. Moreover, the construction of this modified burner was a bit different with an extra device call spoiler, which will be fixed in front end of the nozzle to create a turbulent flow for better mixing of inlet air and oil, so as to increase the burning efficiency. As the cone shape spoiler is set up onto the burner, it will seperate the inlet oil and gas inside and outside the cone , when the oil is injected from the nozzle with a high speed flow, the air inside the cone will be brought out and form a low pressure zone, in this time, if some tiny holes are punched on the wall of the cone, the inlet air outside the cone will leak inside and create a turbulent flow, which can improve the mixing condition of oil and gas and gain burning efficiency. As with the standard burner used in industrial furnaces for testing, comparing the average fuel consumption for unit hour and contrast the emissions of burner with and without installing spoiler, one can find that, the energy saving can effectively reach to 15%，while the emissions of NOxand SOxwere at the utmost reduced by 13% and 9%, respectively. The measured data of CO, CO2and waste heat expelling to environment were keeping the same, but actually they were low down when considering the total volume of inlet air diminished by 10%. The above results show that, with the spoiler attached, the burning system will have obvious benefit for energy saving and emissions reducing, and that really fit the goal of nowadays’ situation to live without energy deficit and environment impact.

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