The development and application of a novel multi-radial-vortex-based ventilation system for dust removal in a fully mechanized tunnelling face

2020 ◽  
Vol 98 ◽  
pp. 103253 ◽  
Author(s):  
Yun Hua ◽  
Wen Nie ◽  
Qiang Liu ◽  
Huitian Peng ◽  
Wenle Wei ◽  
...  
Keyword(s):  
Ventilation System ◽  
Dust Removal ◽  
Mechanized Tunnelling

Wall-Attachment Fan Drum Enclosed Dust Removal Theory and Technology of Mechanized Working Face

2013 ◽  
Vol 807-809 ◽  
pp. 653-662
Author(s):  
Wei Min Cheng ◽  
Yun Wang ◽  
Gang Zhou ◽  
Hao Wang
Keyword(s):  
Ventilation System ◽  
Simple Algorithm ◽  
Field Application ◽  
Dust Removal ◽  
Distribution Law ◽  
Two Phase ◽  
Suppression Effect ◽  
Working Face ◽  
Dust Distribution ◽  
Removal System

FLUENT software and SIMPLE algorithm which was based on parity grid was used to carry out the numerical simulation of spraying dust gas-particle two-phase flow field of the mechanized working face with a single pressure pumping hybrid ventilation system. The dust distribution law of the mechanized working face was mastered and the main dust prevention area was determined to be the middle of the roadway and wall-attachment fan drum enclosed dust removal system of mechanized working face was also planned to be established according to the simulation result. It had been proved that fully-mechanized coal winning machine enclosed dust removal system had a large advantage in reducing dust by computer simulation and field application, the dust suppression effect was remarkable.

scholarly journals Numerical Study of the Respirable Coal Dust Removal Performance of a Vortex Ventilation System at an Excavation Face

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2449 ◽  
Author(s):  
Xiaofei Liu ◽  
Ping Chang ◽  
Enyuan Wang ◽  
Zhenguo Zhang ◽  
Shuai Yang
Keyword(s):  
Numerical Study ◽  
Coal Dust ◽  
Ventilation System ◽  
Dust Control ◽  
Dust Removal ◽  
Two Phase ◽  
Fluid Behavior ◽  
Comparison Results ◽  
High Concentrations ◽  
Ventilation Systems

Coal dust is one of the most serious issues in coal mines. The miners at an excavation face have a high potential for exposure to high concentrations of coal dust. The main method for removing coal dust is by ventilation. To better control the coal dust at the excavation face, it is important to understand the coal dust movement patterns and distribution characteristics. This paper used the computational fluid dynamics (CFD) approach to simulate coal dust movement under two different ventilation systems. The Eulerian-Lagrange method was used to study the gas‒solid two-phase fluid behavior. The coal dust concentration distributions under the two ventilation systems are presented and further compared. From the comparison results, it is found that a vortex ventilation system has better coal dust removal performance. This ventilation system is recommended for excavation for better coal dust control and miners’ health protection.

Optimization of dust removal performance of ventilation system in tunnel constructed using shield tunneling machine

2020 ◽  
Vol 173 ◽  
pp. 106745 ◽  
Author(s):  
Wenjie Zhou ◽  
Wen Nie ◽  
Xiaofei Liu ◽  
Cong Zhou ◽  
Cunhou Wei ◽  
...  
Keyword(s):  
Ventilation System ◽  
Dust Removal ◽  
Shield Tunneling ◽  
Shield Tunneling Machine ◽  
Tunneling Machine

NUMERICAL SIMULATION OF VENTILATION SYSTEM WITHIN AN ARMORED VEHICLE CABIN

2007 ◽  
Vol 14 (2) ◽  
pp. 201-223
Author(s):  
Chin-Lung Chang ◽  
Chang-Hsien Tai ◽  
Chien-Hsiung Tsai ◽  
Yu-Ren Wang ◽  
Qing-Shan Hon
Keyword(s):  
Numerical Simulation ◽  
Ventilation System ◽  
Vehicle Cabin ◽  
Armored Vehicle

Numerical and Experimental Modeling of Indoor Air Quality Inside a Conditioned Space with Mechanical Ventilation and DX-Air Conditioner

2020 ◽  
Vol 38 (9A) ◽  
pp. 1257-1275
Author(s):  
Wisam M. Mareed ◽  
Hasanen M. Hussen
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Ventilation System ◽  
Thermal Conditions ◽  
Airflow Rate ◽  
Air Conditioner ◽  
Breathing Zone ◽  
Lecture Room ◽  
Ventilation Performance

 Elevated CO2 rates in a building affect the health of the occupant. This paper deals with an experimental and numerical analysis conducted in a full-scale test room located in the Department of Mechanical Engineering at the University of Technology. The experiments and CFD were conducted for analyzing ventilation performance. It is a study on the effect of the discharge airflow rate of the ceiling type air-conditioner on ventilation performance in the lecture room with the mixing ventilation. Most obtained findings show that database and questionnaires analyzed prefer heights between 0.2 m to 1.2 m in the middle of an occupied zone and breathing zone height of between 0.75 m to 1.8 given in the literature surveyed. It is noticed the mismatch of internal conditions with thermal comfort, and indoor air quality recommended by [ASHRAE Standard 62, ANSI / ASHRAE Standard 55-2010]. CFD simulations have been carried to provide insights on the indoor air quality and comfort conditions throughout the classroom. Particle concentrations, thermal conditions, and modified ventilation system solutions are reported.

Evaluation of respiratory exposure to 4,4-methylene diphenyl diisocyanate (MDI) vapors in foam injection workers in a household appliance manufacturing company: An Occupational Carcinogen

2019 ◽  
Vol 2 (1) ◽  
pp. 23-27
Author(s):  
Ahmad Nikpey ◽  
Hamzeh Saeidabadi ◽  
Salman Sheikhi ◽  
Saeed Yari ◽  
Tayyebeh Jaddi Madarsara
Keyword(s):  
Ventilation System ◽  
The Body ◽  
Foam Material ◽  
Respiratory Capacity ◽  
Household Appliance ◽  
Administrative Personnel ◽  
Respiratory Exposure ◽  
Methylene Diphenyl Diisocyanate ◽  
Manufacturing Company ◽  
Spss Software

Background: Appliance manufacturing boom is very high hand customers always have a great deal of attention to products that have low energy consumption, therefore the use of isocyanates MDI as a thermal insulation in the body of the refrigerator and is also widely used as a binder in the production of washing machines.  MDI isocyanate study the effects on the respiratory capacity of formers injection was done foam material in a household appliance company Method: this case control study in 1395 and a household appliance manufacturing company in the province of Qazvin 20 personnel working injected foam material is exposed to isocyanates ,for example administrative personnel and 20 served as controls using medical records these values breathing capacity  FVC , FEV1 , FEV1/FVC in  both 1390 and 1394 extracted using SPSS software and paired T-TEST data were analyzed. Results: Measuring the concentration of isocyanate in 90 blocks in the cabin and tap lid above the limit, which was due to the failure of the ventilation system, in 94 years due to the good performance of the ventilation system in the isocyanate concentration was at the limit. According to their experiences foam material is injected every three indexes FVC, FEV1, FEV1/FVC had significant losses, FEV1 and FVC decline among which were a significant level. (p=0.036, p= 0.008) the control samples also non- significant decline in the indicators that this can be attributed to aging. Conclusion: It is known that exposure to isocyanate materials decreased respiratory capacity is personnel, to postpone it to the desired function ventilation system. it would be desirable to postpone the operation of the ventilation system and non-isocyanate leak on the ground, work, be a lot of attention. even with the improvement of the job must be conservative’s injection foam material is exposed to isocyanates be included in the list of hard and hazardous jobs.   Keywords: MDI, respiratory exposure, respiratory capacity, workers inject foam material.

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