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Proposal of a novel solar-driven thermochemical reactor for green hydrogen production using helical flow channels

•New solar-driven biogas reforming reactor using a helical structure is proposed.•Idea of from sides to middle is used for runner design for better thermal matching.•Uneven solar flux distribution is alleviated by a well-designed spiral runner.•Energy grade match analysis is conducted to show the ca...

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Published in:Applied thermal engineering 2024-11, Vol.256, p.124041, Article 124041
Main Authors: Yuan, Shuo, Su, Bosheng, Cai, Jiahao, li, Liang, Jiang, Qiongqiong, Chen, Zhiqiang, Wang, Su
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container_start_page 124041
container_title Applied thermal engineering
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creator Yuan, Shuo
Su, Bosheng
Cai, Jiahao
li, Liang
Jiang, Qiongqiong
Chen, Zhiqiang
Wang, Su
description •New solar-driven biogas reforming reactor using a helical structure is proposed.•Idea of from sides to middle is used for runner design for better thermal matching.•Uneven solar flux distribution is alleviated by a well-designed spiral runner.•Energy grade match analysis is conducted to show the cause for performance rise. The reactor is the core component of the hydrogen production system. Although hydrogen production using solar energy as the heat source can effectively reduce carbon emissions, the reactor faces the problem of uneven heating caused by the collector, and the uneven temperature distribution will significantly affect the hydrogen production process. A key characteristic of the heat collection in dish solar collectors is that the energy flux density is highest at the center and gradually decreases radially, resulting in an uneven heat distribution on the reactor surface. Therefore, the paper focuses on addressing the problem of the uneven distribution of solar concentrating temperature affecting the working efficiency of the reactor. In this study, the reactor’s flow channel is designed in a helical configuration to enable the reaction gas to enter at the edge, gradually flow inward along the helical channel, and exit at the central position. Through simulation studies of the reactor under various working conditions, it was found that the helical structure can effectively facilitate the continuous temperature rise of the reaction gas, with a methane conversion rate of 94.76 %, a hydrogen yield of 1.54 mol/mol, and a total energy conversion efficiency of 32.52 %. Thus, the design of the helical flow channels can effectively utilize the uneven solar heat distribution, allowing the reactor to operate efficiently. Previous studies have focused on enhancing the heat transfer performance of endothermic materials to achieve temperature uniformity; however, this paper adopts a novel approach by innovating the flow channel structure. This paper offers a new concept for the design of solar thermochemical reactors.
doi_str_mv 10.1016/j.applthermaleng.2024.124041
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The reactor is the core component of the hydrogen production system. Although hydrogen production using solar energy as the heat source can effectively reduce carbon emissions, the reactor faces the problem of uneven heating caused by the collector, and the uneven temperature distribution will significantly affect the hydrogen production process. A key characteristic of the heat collection in dish solar collectors is that the energy flux density is highest at the center and gradually decreases radially, resulting in an uneven heat distribution on the reactor surface. Therefore, the paper focuses on addressing the problem of the uneven distribution of solar concentrating temperature affecting the working efficiency of the reactor. In this study, the reactor’s flow channel is designed in a helical configuration to enable the reaction gas to enter at the edge, gradually flow inward along the helical channel, and exit at the central position. Through simulation studies of the reactor under various working conditions, it was found that the helical structure can effectively facilitate the continuous temperature rise of the reaction gas, with a methane conversion rate of 94.76 %, a hydrogen yield of 1.54 mol/mol, and a total energy conversion efficiency of 32.52 %. Thus, the design of the helical flow channels can effectively utilize the uneven solar heat distribution, allowing the reactor to operate efficiently. Previous studies have focused on enhancing the heat transfer performance of endothermic materials to achieve temperature uniformity; however, this paper adopts a novel approach by innovating the flow channel structure. 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The reactor is the core component of the hydrogen production system. Although hydrogen production using solar energy as the heat source can effectively reduce carbon emissions, the reactor faces the problem of uneven heating caused by the collector, and the uneven temperature distribution will significantly affect the hydrogen production process. A key characteristic of the heat collection in dish solar collectors is that the energy flux density is highest at the center and gradually decreases radially, resulting in an uneven heat distribution on the reactor surface. Therefore, the paper focuses on addressing the problem of the uneven distribution of solar concentrating temperature affecting the working efficiency of the reactor. In this study, the reactor’s flow channel is designed in a helical configuration to enable the reaction gas to enter at the edge, gradually flow inward along the helical channel, and exit at the central position. Through simulation studies of the reactor under various working conditions, it was found that the helical structure can effectively facilitate the continuous temperature rise of the reaction gas, with a methane conversion rate of 94.76 %, a hydrogen yield of 1.54 mol/mol, and a total energy conversion efficiency of 32.52 %. Thus, the design of the helical flow channels can effectively utilize the uneven solar heat distribution, allowing the reactor to operate efficiently. Previous studies have focused on enhancing the heat transfer performance of endothermic materials to achieve temperature uniformity; however, this paper adopts a novel approach by innovating the flow channel structure. 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The reactor is the core component of the hydrogen production system. Although hydrogen production using solar energy as the heat source can effectively reduce carbon emissions, the reactor faces the problem of uneven heating caused by the collector, and the uneven temperature distribution will significantly affect the hydrogen production process. A key characteristic of the heat collection in dish solar collectors is that the energy flux density is highest at the center and gradually decreases radially, resulting in an uneven heat distribution on the reactor surface. Therefore, the paper focuses on addressing the problem of the uneven distribution of solar concentrating temperature affecting the working efficiency of the reactor. In this study, the reactor’s flow channel is designed in a helical configuration to enable the reaction gas to enter at the edge, gradually flow inward along the helical channel, and exit at the central position. 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subjects Biogas steam reforming
Cascade utilization of energy
Green hydrogen production
Spiral flow channel
title Proposal of a novel solar-driven thermochemical reactor for green hydrogen production using helical flow channels
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