A circulating ventilation system to concentrate pollutants and reduce exhaust volumes: Case studies with experiments and numerical simulation for the rubber refining process

Zeng, Lingjie; Liu, Guodong; Gao, Jun; Du, Bowen; Lv, Lipeng; Cao, Changsheng; Wei, Ye; Tong, Lewei; Wang, Yirui

doi:10.1016/j.jobe.2020.101984

Cited by 12 publications

(6 citation statements)

References 40 publications

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“…For the simulations, the component transport model was adopted for the contaminant inlet. The standard, RNG, realizable, and low-Re k-ε models were used to simulate the gas turbulence [28,[41][42][43][44]. These models consider the natural buoyancy-driven convection during the diffusion process and use the finite volume method and pressure-velocity coupling format of the SIMPLEC algorithm to obtain the discrete solution of the control equation.…”

Section: Validation Of the Cfd Simulation Methodsmentioning

confidence: 99%

Dynamics and Numerical Simulation of Contaminant Diffusion for a Non-Flushing Ecological Toilet

et al. 2021

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The poor indoor air quality (IAQ) of severely polluted toilets is associated with increased risk of severe disease. This study aimed to evaluate the overall IAQ according to the contaminant removal efficiency, volume average concentration, and breathing zone control level. The characteristics of contaminant transmission in a non-flushing ecological toilet (NFET) were analyzed using the computational fluid dynamics (CFD) methodology, and the proposed model was further validated based on experimental measurements. Both an orthogonal experimental design and CFD were used to analyze factors such as exhaust fan position (EFP), air change rate per hour (ACH), natural vent location (NVL), and grid height (G-h). The EFP and ACH were demonstrated to be the dominant factors affecting the IAQ, whereas NVL and G-h were found to play key roles. Single-factor analysis based on the significance levels of the ACH, EFP, and NVL was conducted using the CFD methodology to define three exhaust behaviors—namely, “ineffective”, “enhanced”, and “excessive”. These results provide key insights that may be used to improve the IAQ of NFETs.

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Section: Validation Of the Cfd Simulation Methodsmentioning

confidence: 99%

Dynamics and Numerical Simulation of Contaminant Diffusion for a Non-Flushing Ecological Toilet

et al. 2021

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“…MWFs are widely used in machining workshops as they can lubricate and cool turning tools and flush metal chips produced by cutting [33]. During the machining process, a large number of oil mist particles are generated, most of which are exhausted to the outdoors through local exhaust hoods [34,35], but a small part can still leak through the gaps of the machine and diffuse into the workshop area. Then, part of the MWFs is directly thrown onto the inner surface of the machine by the rotating tool, thereby attaching it to the workpieces.…”

Section: Model Validationmentioning

confidence: 99%

Cross-Regional Dynamic Transfer Characteristics of Liquid Oil Contamination Induced by Random Contact in Machining Workshops in Shanghai, China

et al. 2022

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In industrial sites, the movement and contact behaviors of workers are random, but their frequency and statistical characteristics can be determined. Particularly in machining workshops, metalworking fluids (MWFs) cause liquid oil contamination on the processed workpieces, and the contamination spreads to the entire workshop given the random contact of workers or the handling of workpieces. This study proposes a contact transmission model based on the Markov chain to quantify oil contamination transfer. First, the transfer efficiency between the glove and the workpiece, which is regarded as a key model parameter in this research, was determined through experiments. The model was used to characterize and predict the spread of oil contamination across different regions, including production and assembly areas. Specifically, the oil contamination concentrations on workbench surfaces in seven locations of a machining workshop in Shanghai GKN HUAYU Driveline Systems Co., Ltd. (SDS) were measured on-site. Findings showed that the model could feasibly depict the transfer process of oil contamination across different surfaces. Then, the variation law of oil contamination concentration on the workbench surfaces over time was analyzed, the oil contamination distribution map of the entire workshop plane was drawn, and the effectiveness of two cleaning measures to reduce oil contamination concentrations was compared. The proposed contact transmission model offers a basis for identifying highly polluted surfaces in machining workshops and controlling the spread of liquid oil contamination.

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“…CFD has also significantly contributed to the tracking of the diffusion path of air pollutants in the settlement and reduction of pollutant concentration. Lingjie et al [20] proposed a new type of circulation system, using the rubber refining process as an example, to concentrate pollutants and reduce exhaust gas. A circulating ventilation model based on mass balance was established to predict the changes in pollutant concentration in the system, and two control strategies (i.e., continuous or intermittent exhaust schemes) were developed to improve the pollutant capture efficiency of the system.…”

Section: Previous Studiesmentioning

confidence: 99%

Wind Environment Simulation Accuracy in Traditional Villages with Complex Layouts Based on CFD

Yao

Han

Dewancker

2021

IJERPH

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Using wind speed, wind direction, and turbulence intensity values as evaluation indicators, the ventilation performance of villages with complex building layouts was studied. We used the SKE, RNG, and RKE solvers in CFD-3D steady-state Reynolds-averaged Navier–Stokes (RANS) to simulate the wind environment of a village. The findings show that for the simulation of rural wind environments with complex building layouts, steady-state simulation solvers need to be evaluated in detail to verify their accuracy. In this study, a village with a complex architectural layout in Southern Shaanxi, China, was taken as the research object, and three steady-state simulation solvers were used to evaluate the ventilation performance of the village. The simulated data were compared with the measured data to find the most suitable solver for this kind of village wind environment simulation. The results show that for the simulation of the village wind environment with a complex building layout, the RNG simulation results have the lowest reliability among the three steady-state solvers. The reliability of wind speed distribution and turbulence intensity distribution are 0.7881 and 0.2473, respectively. However, the wind speed and turbulence intensity values obtained by the SKE solver are the closest to the measured values, which are 0.8625 and 0.9088, respectively. Therefore, for villages with complex building layouts, the SKE solver should be the first choice for simulating wind environment distribution. When using the RNG solver, the overall turbulence intensity value obtained is higher than the measured value. The average deviation between the simulated data and SKE and RKE at a height of 1.7 m is 42.61%. The main reason for this is that RNG overestimates the vortices and underestimates the airflow rate in the building intervals.

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A circulating ventilation system to concentrate pollutants and reduce exhaust volumes: Case studies with experiments and numerical simulation for the rubber refining process

Cited by 12 publications

References 40 publications

Dynamics and Numerical Simulation of Contaminant Diffusion for a Non-Flushing Ecological Toilet

Dynamics and Numerical Simulation of Contaminant Diffusion for a Non-Flushing Ecological Toilet

Cross-Regional Dynamic Transfer Characteristics of Liquid Oil Contamination Induced by Random Contact in Machining Workshops in Shanghai, China

Wind Environment Simulation Accuracy in Traditional Villages with Complex Layouts Based on CFD

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