Article
Green & Sustainable Science & Technology
Goutham Kotamreddy, Ryan Hughes, Debangsu Bhattacharyya, Michael Matuszewski, Benjamin Omell
Summary: A detailed 1-D non-isothermal model is developed for moving beds using micro-encapsulated carbon sorbents (MECS) with sodium bicarbonate. The model integrates a rigorous capsule model with a bulk phase model, resulting in a multi-scale reactor model. A plant-wide model is developed for the capture system, including absorbers, regenerators, heat recovery systems, and balance of the plant. Sensitivity studies are conducted to evaluate the impact of operating and design variables. An economic model is developed and optimized for minimizing Equivalent Annual Operating Cost (EAOC). The optimized EAOC for the MECS-based moving bed reactor is found to be 8% better than traditional MEA-based CO2 capture with similar heat recovery extent.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2023)
Article
Thermodynamics
Zhigang Guo, Xing Tian, Zhihong Wu, Jian Yang, Qiuwang Wang
Summary: This study investigated the heat transfer mechanism of granular flow in moving bed heat exchangers. It was found that the heat transfer coefficients are sensitive to the flow rate in slow granular flow, with smooth flow and particle mixing improving heat transfer, while local particle lagging worsening heat transfer.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Engineering, Chemical
Xing Tian, Feng Zhu, Zhigang Guo, Jiayue Zhang, Jian Yang, Qiuwang Wang
Summary: This study developed a heat transfer model based on the discrete element method to investigate the effect of a trap-ezoidal corrugated plate on heat transfer. The results showed that in the upstream region of the trapezoidal bulge, the contact resistance of the trap-ezoidal corrugated plate unit (TCPU) decreased compared to a flat plate. In the side and downstream regions, the trapezoidal bulge enhanced particle mixing, disrupted the temperature boundary layer development, and improved heat transfer performance.
Article
Energy & Fuels
Jun-Ming Yin, Qiu-Yun Zheng, Xin-Rong Zhang
Summary: This article proposes a dynamic analysis framework for a shell and plate particle-SCO2 moving packed bed heat exchanger (MPBE) and analyzes the dynamic responses of five MPBE configurations under different conditions.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Energy & Fuels
Zhigang Guo, Zhoutuo Tan, Xing Tian, Zhihong Wu, Tian Wang, Jian Yang, Qiuwang Wang
Summary: By controlling thermal resistance, heat transfer performance in granular flow can be effectively improved, with the need to reduce thermal boundary layer thickness and increase effective thermal conductivity. Staggered arrangement is an effective way to limit the development of thermal boundary layer.
Article
Engineering, Chemical
Xing Tian, Zhigang Guo, Haonan Jia, Jian Yang, Qiuwang Wang
Summary: The heat transfer performance of ELCT is superior to that of CT, similar to ET, and exhibits better performance in inside-tube heat transfer and flexural capacity. ELCT reduces stagnation and cavity zones while improving heat transfer at the top and bottom of the tube.
Article
Energy & Fuels
Viktor Stenberg, Magnus Ryden, Fredrik Lind
Summary: Bed-to-tube heat transfer in a tertiary superheater of a Circulating Fluidized Bed (CFB) boiler was studied in Norrko center dot ping, Sweden. The study aimed to investigate the heat transfer coefficients over different time periods, with different bed materials and designs. The results showed relatively low heat transfer coefficients compared to literature data and lab-scale experiments. Increasing the tube pitch was suggested to improve bed-to-tube heat transfer.
Article
Thermodynamics
Savio L. Bertoli, Carolina K. de Souza, Marcel Jefferson Goncalves, Natan Padoin, Cintia Soares
Summary: This paper presents a solution to the problem of a co/counter-current, indirect heated, diluted, tubular, vertical moving bed heat exchanger using the self-adjoint operator method. The analysis of the eigenvalue equation reveals five different thermal behaviors, which are validated through numerical calculations. The results of this study have implications for the solution of similar heat transfer problems in triple tube heat exchangers with thermal losses.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Engineering, Environmental
Shuai Wang, Yansong Shen
Summary: This study develops a computational model to investigate the physical-thermal characteristics of pyrolysis in end-of-life solar panels. The simulation results show that the bubbling fluidized bed reactor achieves higher removal degree of the binder compared to the fixed bed reactor. Higher wall temperature significantly improves the removal degree, while superficial gas velocity has a smaller impact. The findings provide insights for the design and optimization of pyrolyzers for efficient solar panel recycling.
RESOURCES CONSERVATION AND RECYCLING
(2022)
Article
Thermodynamics
Lucas Lovis, Priscilla Tremain, Andrew Maddocks, Behdad Moghtaderi
Summary: Water scarcity is a significant issue, particularly in developing countries and remote locations. This study investigates the potential of desiccant coated heat exchangers as a sorption reactor for atmospheric water generation. The study found that the coating at the inlet and outlet regions of the channels were underutilised.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Thermodynamics
Dongfang Li, Kyeongho Kim, Minwoo Kim, Yijie Zeng, Zhongzhi Yang, Sangho Lee, Xiaofeng Lu, Chung-Hwan Jeon
Summary: This study investigated the effect of particle size on bed-to-surface heat transfer in a bubbling FBHE of a 550 MWe ultra-supercritical CFB boiler. Experimental results showed that heat transfer coefficient increases with decreasing particle sizes. Improving cyclone efficiency to achieve finer particle size can enhance heat transfer in FBHE.
Article
Thermodynamics
S. Anitha, K. Loganathan, M. Pichumani
Summary: Numerical analysis was conducted on the heat transfer performance of an industrial-length double-tube heat exchanger using hybrid nanofluid and an external magnetic field. Results showed that the presence of a magnetic field led to higher Nusselt numbers for CNT-Fe3O4/water hybrid nanofluid, resulting in improved thermal efficiency and performance index of the heat exchanger. Reynolds number had a significant impact on the effectiveness.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Energy & Fuels
David Cann, Carolina Font-Palma
Summary: This study aims to develop energy balance models for moving bed columns that involve phase change of CO2 into frost. The models were evaluated by comparison with experimental and simulated data to assess their accuracy.
Article
Chemistry, Multidisciplinary
Francois Rouze l'Alzit, Thierry Cardinal, Gerard L. Vignoles, Elise Bonnet, Manuel Gaudon
Summary: This study used a thermal sensor to investigate the interaction between a laser beam and a 0.5% Mn-doped ZnAl2.2O4 material, focusing on the laser defocusing parameter. The optical properties of the material were found to be dependent on its thermal history. Thin films of the material were obtained using a screen printing process, and laser irradiation was performed with different levels of defocusing. The luminescence properties around the laser tracks allowed for the determination of the material's thermal history at a micrometer scale. The results showed that defocusing the laser led to a decrease in thermal gradients.
Article
Thermodynamics
A. K. Aadhithiyan, R. Sreeraj, S. Anbarasu
Summary: An appropriate thermal management system design is crucial for achieving optimal thermal performance in metal hydride-based hydrogen storage reactors. This study developed a 3D thermal model to investigate the hydrogen sorption performance of different heat exchanger configurations. The results showed that a capillary bundled reactor with 253 tubes of 3 mm diameter outperformed smaller diameter reactors in terms of fabrication flexibility and sorption speed. Additionally, helical coiled reactors exhibited faster absorption and desorption compared to embedded cooling tubes.
APPLIED THERMAL ENGINEERING
(2022)