scholarly journals A Thermal Design of a 1 kW-Class Shell and Tube Methanol Steam Reforming System with Internal Evaporator

Processes ◽  
2020 ◽  
Vol 8 (11) ◽  
pp. 1509
Author(s):  
Dongjin Yu ◽  
Ngoc Trinh Van ◽  
Jinwon Yun ◽  
Sangseok Yu
Keyword(s):  
Heat Recovery ◽  
Operating Temperature ◽  
Thermal Design ◽  
Methanol Steam Reforming ◽  
Water Mixture ◽  
Methanol Reforming ◽  
Steam Reformer ◽  
Stable Conditions ◽  
Shell And Tube ◽  
Wide Operating

Due to its low operating temperature, the performance of a methanol steam reformer depends on efficient thermal integration. In particular, the integration of the evaporator is crucial to enhance thermal efficiency. This paper presents two different configurations to utilize thermal energy for evaporation of methanol/water mixture. The reformer system is composed of a methanol steam reformer, a burner, and two different evaporators such as internal evaporator and external evaporator. Moreover, since the performance of the reforming system strongly depends on thermal utilization, a heat recovery module is designed for methanol reforming system with internal evaporator. The heat duty and steam to carbon ratio (S/C) are the variables for evaluation of its suitability. The experimental results indicate that the internal evaporator with the auxiliary heat recovery module provides stable conditions over wide operating ranges.

scholarly journals Evaporation of Methanol Solution for a Methanol Steam Reforming System

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4862
Author(s):  
Ngoc Van Trinh ◽  
Younghyeon Kim ◽  
Hongjip Kim ◽  
Sangseok Yu
Keyword(s):  
Cylindrical Shell ◽  
Steam Reforming ◽  
Heat Exchangers ◽  
Methanol Conversion ◽  
Methanol Solution ◽  
Methanol Steam Reforming ◽  
Field Mode ◽  
Methanol Reforming ◽  
Shell And Tube ◽  
Fundamental Requirement

In a methanol-reforming system, because the mixture of methanol and water must be evaporated before reaching the reforming reaction zone, having an appropriate evaporator design is a fundamental requirement for completing the reforming reaction. This study investigates the effect of the evaporator design for the stable reforming of methanol–water mixtures. Four types of evaporator are compared at the same heat duty of the methanol-reforming system. The four evaporators are planar heat exchangers containing a microchannel structure, cylindrical shell-and-tube evaporators, zirconia balls for internal evaporation, and combinations of cylindrical shell-tubes and zirconia balls. The results show that the evaporator configuration is critical in performing stable reform reactions, especially for the flow-field mode of the evaporator. Additionally, the combination of both internal and external evaporation methods generates the highest performance for the methanol-reforming system, with the methanol conversion reaching almost 98%.

scholarly journals Design and Empirical Inquisition of Catalytic Combustor for Methanol Steam Reformer in HT-PEM Fuel Cell Systems

2020 ◽  
Vol 9 (4) ◽  
pp. 1776-1783
Keyword(s):  
Fuel Cell ◽  
Active Sites ◽  
Operating Temperature ◽  
Pem Fuel Cell ◽  
Packed Bed ◽  
Cell System ◽  
Normal Operation ◽  
Water Mixture ◽  
Steam Reformer ◽  
Catalytic Combustor

Steam reforming of methanol is a basic endothermic reaction. For which, a separate external system is required for generation of heat. The reaction speeds are controlled by operating temperature and heat transfer rate to the reactor. This operating temperature has a very narrow window of operation. It is therefore extremely important to have a system that generates controlled combustion based stable heat for providing required heat to reformer. A design of catalytic combustor was developed and analyzed for methanol steam reformer. The packed bed of combustion catalyst provides active sites for combustion of the methanol water mixture during start-up and later for combustion of anode exhaust gas (AEG) during normal operation. The combustion reactions and their thermodynamics were studied for commercial catalyst. System design was simulated using Engineering Equation Solver (EES) software for determining the quantity of air required for combustion of fuel as well as for dilution of gases to maintain a temperature of 573 K. The design was analyzed using ANSYS DISCOVERY LIVE for understanding the different operating condition(s) inside the combustor. It was also used to generate design of experiments to evaluate, build and demonstrate a catalytic combustor for on-board reformer for HT-PEM fuel cell system.

Thermal design, rating and second law analysis of shell and tube condensers based on Taguchi optimization for waste heat recovery based thermal desalination plants

2018 ◽  
Vol 54 (9) ◽  
pp. 2885-2897 ◽  
Author(s):  
Balaji Chandrakanth ◽  
Venkatesan G ◽  
Prakash Kumar L.S.S ◽  
Purnima Jalihal ◽  
Iniyan S
Keyword(s):  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Thermal Design ◽  
Second Law ◽  
Taguchi Optimization ◽  
Second Law Analysis ◽  
Thermal Desalination ◽  
Shell And Tube ◽  
Desalination Plants

scholarly journals An adaptive fusion estimation algorithm for state of charge of lithium-ion batteries considering wide operating temperature and degradation

2020 ◽  
Vol 462 ◽  
pp. 228132 ◽  
Author(s):  
Xing Shu ◽  
Guang Li ◽  
Jiangwei Shen ◽  
Wensheng Yan ◽  
Zheng Chen ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Operating Temperature ◽  
Lithium Ion ◽  
Estimation Algorithm ◽  
State Of Charge ◽  
Adaptive Fusion ◽  
Wide Operating

Generating Innovative Solid Polymer Electrolyte Based on Melanin and Without Binder for High Energy Li Batteries

2021 ◽  
Vol 105 (1) ◽  
pp. 29-34
Author(s):  
Elena Shembel ◽  
Yuliya Polishchuk ◽  
Volodymyr Kyrychenko ◽  
Volodymyr Redko ◽  
Boris A Blyuss ◽  
...  
Keyword(s):  
High Temperature ◽  
Polymer Electrolyte ◽  
Chemical Stability ◽  
Solid Polymer Electrolyte ◽  
Operating Temperature ◽  
High Energy ◽  
Solid Polymer ◽  
Special Design ◽  
Li Batteries ◽  
Wide Operating

The goal of this investigation is connected with wishes to use the melanin for formulating the solid polymer electrolyte without the binder for Li batteries. Nature and properties of solid polymer electrolyte of the Li batteries is an important factor for ensuring the properties of Li batteries. For successful optimization the properties of Li batteries the following list includes the important requirements for the polymer electrolyte: high conductivity in wide operating temperature, chemical stability and no ignition at under high temperature - even more than 1000C, low impedance of interface between electrode and solid polymer electrolyte, special design of system - the solid polymer electrolyte in porous structure of electrode. For developing the solid polymer electrolyte without the binder we fulfill this goal includes the melanin in the solid polymer electrolyte.

A triPEG-boron based electrolyte membrane for wide temperature lithium ion batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (24) ◽  
pp. 20343-20348 ◽  
Author(s):  
Junyi Xu ◽  
Jie Li ◽  
Yuewu Zhu ◽  
Kai Zhu ◽  
Yexiang Liu ◽  
...  
Keyword(s):  
Solid State ◽  
Lithium Ion Batteries ◽  
Operating Temperature ◽  
Lithium Ion ◽  
Electrolyte Membrane ◽  
Wide Operating

A wide operating temperature electrolyte membrane is fabricated for all-solid-state lithium ion batteries.

Electrothermal alloy embedded V2O5-WO3/TiO2 catalyst for NH3-SCR with promising wide operating temperature window

2022 ◽  
Author(s):  
Wei Li ◽  
Du Xuesen ◽  
Zhi Li ◽  
Yaqin Tao ◽  
Jingyu Xue ◽  
...  
Keyword(s):  
Operating Temperature ◽  
Tio2 Catalyst ◽  
Nh3 Scr ◽  
Temperature Window ◽  
Wide Operating

A Flexible and Safe Aqueous Zinc–Air Battery with a Wide Operating Temperature Range from −20 to 70 °C

2020 ◽  
Vol 8 (31) ◽  
pp. 11501-11511 ◽  
Author(s):  
Rui Chen ◽  
Xiubin Xu ◽  
Siyu Peng ◽  
Junmin Chen ◽  
Danfeng Yu ◽  
...  
Keyword(s):  
Operating Temperature ◽  
Temperature Range ◽  
Air Battery ◽  
Wide Operating ◽  
Operating Temperature Range
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