Article
Engineering, Chemical
Han Lv, Yuxue Liu, Yingying Dong, Yiping Fan, Chunxi Lu
Summary: The filtration performance of the moving bed granular filter with axial flow (MBGF-AF) was investigated through a large cold experiment. The effect of different operation parameters on the filtration performance was studied, and it was found that the collection efficiency can be enhanced by adjusting the gas velocity, dust concentration, and particle velocity.
Article
Engineering, Chemical
Shaowu Yin, Peng Kang, Ying He, Li Wang, Chuanping Liu, Lige Tong, Yulong Ding
Summary: The new moving granular bed filter is designed to achieve high-efficiency filtration of fine dust and high performance for different environments, with wide adaptability. This filter demonstrates better dust removal performance, low bed resistance, and high filtration efficiency, maintaining a high filtration efficiency while reducing bed pressure drop effectively.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Energy & Fuels
Chiawei Chang, Yishun Chen, Litsung Sheng, Shusan Hsiau
Summary: The proposed dust removal technology utilizes a two-stage moving granular bed filter with coarse and fine granules to effectively remove particles larger than 1.775 μm, improving collection efficiency and particle size distribution. The choice of different mass flow rates for coarse and fine granules impacts pressure drop and mass consumption ratio.
Article
Engineering, Chemical
Hongsheng Ding, Shuo Liang, Lige Tong, Shaowu Yin, Li Wang, Yulong Ding
Summary: In this study, a coupled EDEM-Fluent simulation was used to investigate the contact adhesion between fine particles and filter granules. The effects of inlet gas temperature, inlet gas velocity, and filter layer arrangement on dust removal efficiency were analyzed. The results showed that dust removal efficiency decreased with increasing inlet temperature and exhibited a decrease-then-increase trend with the inclusion of thermophoresis, with a turning point at 973 K. Inlet gas velocity had a relatively small impact on dust removal efficiency. By optimizing the granular bed structure with a 4:1 granular size ratio arrangement, dust removal efficiency was significantly improved while the pressure drop increased only slightly.
Article
Engineering, Chemical
Mengxiang Jiang, Ping Wu, Likang Hu, Heping Fu, Biduan Chen, Li Wang
Summary: This study experimentally investigated the effects of free slope length, particle replacement rate, and inlet large particle mass fraction on size segregation in a moving granular bed. Results showed significant impacts of these factors on the degree of size segregation.
Article
Engineering, Chemical
Han Lv, Yiping Fan, Kai Xing, Mengxi Liu, Chunxi Lu
Summary: Particulate Matter (PM) pollution is a serious threat to public health, and granular bed filtration is an efficient technique for gas cleaning at high temperatures. A counter-current moving bed granular filter with novel internal components was proposed for capturing fine particulates. The effects of the filter on removing dust of different sizes (micron and nanometer scale) were investigated, and the results showed that dust can be easily captured under specific conditions. Based on the experimental results and single-particle filtration mechanism, an efficiency calculation model was developed.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Han Lv, Yiping Fan, Kai Xing, Sihong Gao, Chunxi Lu
Summary: High-temperature gas purification technique is of great significance for environmental protection. Moving bed filtration with gas-solid counter flow was proposed and investigated in this study. Experimental results indicate that an increasing filter gas velocity or a decreasing mass flow rate of the granule leads to a decrease in dust collection efficiency. An empirical equation was given to calculate the moving bed filtration efficiency.
Article
Engineering, Chemical
Mengxiang Jiang, Ping Wu, Xianpeng Chen, Heping Fu, Nan Qiu, Li Wang, Chunyang Dong
Summary: A moving granular bed filter was designed to separate different size particles spontaneously. The flow characteristics of binary particles in the filter were studied, and typical separation trajectories during size segregation were provided. The degree of size segregation decreased with the increase of particle mass flux.
Article
Engineering, Chemical
Jianpeng Wang, Heqiang Zou, Hao Chen, Hanbang Ruan, Guohua Yang
Summary: This article established a dual-layer granular bed filtration model based on the dust collision rebound effect and investigated the influence of dust properties and filtration air velocity on the collision rebound effect and grade efficiencies of the filter layers. The results showed that the characteristics of dust particle size, density, and effective Young's modulus had a significant impact on the critical adhesion velocity and collision rebound effect. An increase in filtration velocity led to a decrease in grade efficiencies of each filter layer in the dual-layer granular bed.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Green & Sustainable Science & Technology
Yi-Shun Chen, Shu-San Hsiau, Cheng-En Liao, Shih-Hao Chou
Summary: The study aims to develop a filtration system for industrial environments that utilizes a moving granular bed filter to cool and condense tar based on its dew point temperature characteristics. The collected tar can be analyzed for removal efficiency by comparing inlet and outlet concentrations.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Chemical
Tao Liu, Zhifeng Zhao, Ruojin Wang, Meng Tang, Dewu Wang, Shaofeng Zhang
Summary: A new mesoscale simulation approach for axial granular bed filters (GBFs) is developed by incorporating macroscopic calculation models and conservation equations into the porous media model and source term. The effects of various conditions on pressure drop and dust-removal efficiency are investigated, showing that the pressure drop increases with bed height, gas velocity, dust concentration, and filtration time, while decreasing with initial bed voidage and granular diameter. The dust-removal efficiency is affected by Reynolds number, effective Stokes number, and equivalent granular diameter ratio, increasing with bed height, gas velocity, dust diameter, and filtration time, and decreasing with dust concentration, initial bed voidage, and granular diameter.
Article
Environmental Sciences
Jianyu Ren, Xuesong Yan, Lidong Zhang, Guohua Yang
Summary: Experimental results show that using an external electric field in dual-layer granular bed filters can effectively improve the filtration efficiency for micro-silica powder. Pre-charging the dust and adjusting the application of the electric field can reduce the outlet dust concentration and pressure drop, leading to better filtration performance.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Thermodynamics
Junlin Chen, Jingzhi Zhou, Xunfeng Li, Xiulan Huai
Summary: This study investigated the heat transfer characteristics and waste heat recovery of a moving granular bed filter during hot gas clean-up. It was found that moderate granular velocity and superficial velocity are recommended to achieve high waste heat recovery efficiency.
APPLIED THERMAL ENGINEERING
(2022)
Article
Engineering, Chemical
Han Lv, Yiping Fan, Kai Xing, Chunxi Lu
Summary: Moving bed granular filters are widely used for high-temperature gas filtration. The performance of capturing particles is crucial in determining the filter's efficiency. Experimental results showed that the filter's performance was similar when using different capturing granules under the same operating conditions. Lower gas or granule velocity resulted in higher filtration efficiency. The empirical relationship between single particle trapping mechanism and total efficiency of the filter was proposed based on particle size distribution, particle shape, and theoretical analysis of the void fraction construction.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Engineering, Chemical
Yuan Jiang, Guilian Liu, Xiaohong Yan
Summary: This study designed an ionic wind-driven fog collector for windless environments, and numerical results showed that the positioning of the discharge electrode significantly affected the flow pattern and fog collection rate. The fog collection rate was several times higher in a nearly unidirectional flow compared to a vortex dominant flow. Increasing input power resulted in a 6.7 times enhancement in fog collection rate, and fog collection rate increased linearly with liquid water content under fixed power consumption. A fog collector prototype was fabricated and measurements supported the numerical design, achieving a collection rate of 0.46 L/h in a windless foggy environment with a liquid water content of 0.62 g/m3.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Energy & Fuels
Laura L. Trinkies, Marlene Crone, Michael Tuerk, Manfred Kraut, Roland Dittmeyer
Summary: In this study, mono- and bimetallic Pd and Pt catalysts were deposited via supercritical fluid reactive deposition (SFRD) on TiO2 coated additively manufactured substrates. The focus of this work was to evaluate the suitability of these catalysts for the direct synthesis of H2O2 in the liquid phase. The results showed that all catalysts exhibited high activity and productivity, with PdPt bimetallic catalysts showing the highest productivity and an increase in Pd loading leading to a decrease in productivity. Comparison with literature data demonstrated the high suitability of the SFRD method for the proposed application, with the added benefits of simplicity and environmental friendliness in catalyst production.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2024)
Article
Energy & Fuels
Xiongbao Hu, Zuguo Shen, Yu Wang
Summary: It is impossible to control the outer wall temperature of the micro-combustor below the maximum allowable temperature of commercial thermoelectric generators simply through increasing the equivalent heat transfer coefficient. Three simple strategies were developed to improve temperature uniformity, yet none of them could ensure full temperature control.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2024)
