Ventilation strategy for random pollutant releasing from rubber vulcanization process

2016 ◽  
Vol 26 (2) ◽  
pp. 248-255 ◽  
Author(s):  
Changsheng Cao ◽  
Jun Gao ◽  
Yumei Hou ◽  
Jie Chen
Keyword(s):  
Production Process ◽  
Ventilation System ◽  
Primary Source ◽  
Emission Characteristic ◽  
Ventilation Strategy ◽  
Exhaust Hood ◽  
Cumulative Emission ◽  
Measurement Results ◽  
Vulcanization Process ◽  
Source Emission

This paper investigates the emission characteristic of a rubber vulcanization process in a workshop and tries to formulate a ventilation strategy for the rubber vulcanization production process with a lower exhaust rate. Measurements were performed to derive detailed source emission characteristic of rubber vulcanization process in a rubber workshop. The measurement results show that the primary source emission process was concentrated within 600 s of a vulcanization process, the corresponding cumulative emission percentage reached up to 95%. Based on random pollutant releasing from rubber vulcanization process, a single local exhaust hood was applied for a curing machine, the corresponding exhaust rate of 4000 m3/h was proven to be reliable for capturing rubber fume by the experimental and numerical methods. The corresponding cumulative capture efficiency of the single local exhaust hood was 92.1% at 600 s. A new ventilation system equipped with single local exhaust hood was further designed for the rubber vulcanization production process line, and the total exhaust rate of this system was only a quarter of the original one used in a large exhaust hood system. These findings have illustrated that the new ventilation system equipped with single local exhaust hood could largely reduce the exhaust rate in a rubber vulcanization workshop.

scholarly journals An analysis of the innovative exhaust air energy recovery heat exchanger

2018 ◽  
Vol 240 ◽  
pp. 02003 ◽  
Author(s):  
Marek Borowski ◽  
Marek Jaszczur ◽  
Daniel Satoła ◽  
Sławosz Kleszcz ◽  
Michał Karch
Keyword(s):  
Heat Exchanger ◽  
Energy Recovery ◽  
Energy Use ◽  
Dynamic Change ◽  
Ventilation System ◽  
Primary Source ◽  
Winter Period ◽  
Recovery Efficiency ◽  
Total Energy Consumption ◽  
Result Show

Heating, ventilation and air conditioning systems are responsible for a nearly 50% of total energy consumption in operated buildings. One of the most important parts of the ventilation system is an air handling unit with a heat exchanger for energy recovery which is responsible for effective and efficient energy recovery from exhaust air. Typically heat exchangers are characterised by the producers by heat and humidity recovery efficiency up to 90% and 75% respectively. But these very high values are usually evaluated under laboratory conditions without taking into account a dynamic change of outdoor and indoor air conditions significantly affecting the recovery efficiency. In this paper, results of thermal, humidity and enthalpy recover efficiency of innovative energy recovery exchanger have been presented. The analysed system allows adjustment of the humidity recovery especially useful in the winter period and forefends energy use for an anti-froze system of energy exchanger. Presented result show that analysed innovative system can achieve the value of thermal efficiency recovery higher than 90% and efficiency of humidity recovery about 80%. This is possible because the analysed system is able to work without the use of any primary source energy or other anti-freeze systems. Presented in this research unique solution is able to work without external anti-freeze systems even in extremely adverse outdoor air conditions such as minus 20°C and humidity 100% RH.

Comprehensive Control of 7-Amino-Cephalsporanic Acid Dust in Drying Workshop

2014 ◽  
Vol 522-524 ◽  
pp. 481-484
Author(s):  
Jin Feng Zhang ◽  
Xin Liu ◽  
Li Min Hou ◽  
Qin Liu
Keyword(s):  
Adverse Effects ◽  
Production Process ◽  
Ventilation System ◽  
Dust Control ◽  
Control Measures ◽  
Explosion Hazard ◽  
Work Safety ◽  
Process Technology ◽  
Dust Generation ◽  
Pharmaceutical Enterprise

7-amino-cephalsporanic acid (7-ACA) is the key intermediate of cephalosporin, which has a strong sensitization and explosion hazard. So it seriously affects the worker’s health in the workshop, the environment safety out of the workshop and work safety. The drying workshop of 7-ACA at a pharmaceutical enterprise in Shijiazhuang is investigated and the production process is analyzed, the key places of dust leakage and the causes of dust generation are identified. Combined with the pollution and safety risk in drying workshop, the targeted control measures are taken from the process technology, ventilation system and dust collecting device, which effectively removed the adverse effects from 7-ACA leaking. The study provides a reference for the dust control in similar enterprises.

Investigation of W-Re-Ni Heavy Alloys Produced from Plasma Spheroidized Powders

2013 ◽  
Vol 199 ◽  
pp. 448-453
Author(s):  
Tomasz Majewski
Keyword(s):  
Chemical Composition ◽  
Production Process ◽  
Plasma Jet ◽  
Heavy Alloys ◽  
Measurement Results ◽  
Properties Of Materials

Measurement results of 92W-5Re-3Ni and 77W-20Re-3Ni sinters produced from powders spheroidized in a plasma jet are presented in the paper. The production process is described, typical microstructures are presented, and the analysis of chemical composition in selected microregions of the samples have been performed. Additionally, a comparison of selected properties of materials produced from powders spheroidized in plasma and from non-modified powders is shown.

scholarly journals Flow-Field Characteristics of High-Temperature Annular Buoyant Jets and Their Development Laws Influenced by Ventilation System

2013 ◽  
Vol 2013 ◽  
pp. 1-11
Author(s):  
Yi Wang ◽  
Yanqiu Huang ◽  
Jiaping Liu ◽  
Hai Wang ◽  
Qiuhan Liu
Keyword(s):  
High Temperature ◽  
Flow Field ◽  
Cross Section ◽  
Flow Rate ◽  
Ventilation System ◽  
Volumetric Flow Rate ◽  
Outer Diameter ◽  
Exhaust Hood ◽  
Buoyant Jets ◽  
Flow Field Characteristics

The flow-field characteristics of high-temperature annular buoyant jets as well as the development laws influenced by ventilation system were studied using numerical methods to eliminate the pollutants effectively in this paper. The development laws of high-temperature annular buoyant jets were analyzed and compared with previous studies, including radial velocity distribution, axial velocity and temperature decay, reattachment position, cross-section diameter, volumetric flow rate, and velocity field characteristics with different pressures at the exhaust hood inlet. The results showed that when the ratio of outer diameter to inner diameter of the annulus was smaller than 5/2, the flow-field characteristics had significant difference compared to circular buoyant jets with the same outer diameter. For similar diameter ratios, reattachment in this paper occurred further downstream in contrast to previous study. Besides, the development laws of volumetric flow rate and cross-section diameter were given with different initial parameters. In addition, through analyzing air distribution characteristics under the coupling effect of high-temperature annular buoyant jets and ventilation system, it could be found that the position where maximum axial velocity occurred was changing gradually when the pressure at the exhaust hood inlet changed from 0 Pa to −5 Pa.

scholarly journals Influence of the scheme of air exchange organization in the room on the efficiency of the air-jet hood of the heat treatment chamber

2020 ◽  
Vol 224 ◽  
pp. 03026
Author(s):  
Tatyana Zhilkina ◽  
Viktor Pukhkal ◽  
Vladislav Pankov
Keyword(s):  
Heat Treatment ◽  
Software Package ◽  
Computational Experiment ◽  
Ventilation System ◽  
Exhaust Hood ◽  
Local Exhaust Ventilation ◽  
Exhaust Ventilation ◽  
Air Jet ◽  
Calculation Results ◽  
Air Exchange

Local exhaust ventilation allows maximizing the localization of hazards with minimum values of air exchange in the room. For the study, the design of a local exhaust in the form of an air-jet hood at an open doorway of the UKM Classic M 2005 chamber by Mauting was adopted. Geometric models have been developed, including a heat treatment chamber, a room from which the chamber is loaded, a supply and exhaust hood over the door from the chamber to the room, and a supply air duct with air distributing devices. The results of a computational experiment on modeling the operation of the local exhaust ventilation system of the heat treatment chamber are presented. The STAR-CCM+ software package was used as a calculation program. The calculation results were analyzed. The influence of the air exchange scheme (location of the supply devices) in the room on the efficiency of the local exhaust devices (supply and exhaust hood) has been established.

scholarly journals Behavior Characteristics of Hazardous Gas and Scattering Coal Dust in Coal Storage Sheds

2021 ◽  
Vol 11 (24) ◽  
pp. 11771
Author(s):  
Mok-Lyang Cho ◽  
Ji-Soo Ha ◽  
Tae-Kwon Kim
Keyword(s):  
Carbon Monoxide ◽  
Natural Ventilation ◽  
Coal Dust ◽  
Retaining Wall ◽  
Ventilation System ◽  
Spontaneous Ignition ◽  
Flow Stagnation ◽  
Measurement Results ◽  
Behavior Characteristics ◽  
And Behavior

This study has comprehensively analyzed the ventilation system of an indoor coal storage shed using computational fluid dynamics (CFD). In addition, the effects of the plan to improve the ventilation system were investigated by synthesizing the results. First, the velocity of inlet wind entering through the natural ventilation system was measured. Then, the concentration of carbon monoxide inside the coal storage shed was measured at the spontaneous combustion of coal. The boundary conditions were set using the measurement results. The characteristics of carbon monoxide concentration, ventilation volume, and behavior of scattering dust were analyzed. According to the CFD analysis results, the upper recirculation strength increased as the flow rate of external air increased. The flow-stagnation area occurred on the center wall. In particular, the concentration of carbon monoxide was high in the flow-stagnation area. When the inflow velocity was 2.0 m/s, a risk of 30 ppm or more occurred in the area near the second-floor workspace and central retaining wall. When ventilation dropped sharply, coal dust emissions decreased to 14.5%. Thus, ventilation must be secured by installing a natural ventilation system, in case spontaneous ignition occurs in many cells or the ventilation sharply decreases. Finally, in order to improve the ventilation system, the effect on the additional installation of natural ventilation and the use of mobile blowers was analyzed. Finally, in order to improve the ventilation system, the effect on the additional installation of natural ventilation and the use of mobile blowers was analyzed. As a result of the analysis, we concluded that using a mobile blower is more effective than a method of additionally installing a natural ventilation device. Carbon monoxide may be locally diluted, and ventilation volume additionally secured.

scholarly journals Statistical control of the production process of rolled products

2018 ◽  
Vol 20 (20) ◽  
pp. 26-31 ◽  
Author(s):  
Krzysztof Knop
Keyword(s):  
Statistical Analysis ◽  
Production Process ◽  
Normal Distribution ◽  
Control Charts ◽  
Statistical Control ◽  
Measurement Results ◽  
Corrective Actions ◽  
Fmea Method ◽  
The Stability ◽  
Level Of Risk

Abstract The article presents the results of the use of SPC tools, i.e. control charts and indicators of the qualitative capability to assess the stability and capability of the production process of rolled products - I-sections. Statistical analysis of the collected data regarding the selected feature of the analysed product - the width of the foot, and the normality of the distribution were done, which showed that the obtained distribution of measurement results is not a normal distribution. As a result, appropriate SPC procedures for non-normal distribution were used. The Pareto-Lorenzo diagram and FMEA method were also used to obtain information about the structure of non-conformities of the analysed product and the level of risk associated with them. This information was used to propose corrective actions and improve the production process of rolled products.

scholarly journals Local exhaust ventilation solutions for an industrial hall – Part 1 CFD analysis of the local exhaust systems

2019 ◽  
Vol 85 ◽  
pp. 02012
Author(s):  
George-Mădălin Chitaru ◽  
Mihnea Sandu ◽  
Cristiana Verona Croitoru ◽  
Florin Bode
Keyword(s):  
Ventilation System ◽  
Preliminary Design ◽  
Cfd Analysis ◽  
Ventilation Strategy ◽  
Treatment Facility ◽  
Local Exhaust Ventilation ◽  
Exhaust Ventilation ◽  
Pollutant Concentrations ◽  
High Ammonia

Industrial hygiene is an important aspect of any workplace environment, especially for the industrial domain. A previous study has shown that high ammonia levels were present in a wastewater treatment facility in Romania. The initial ventilation strategy was not efficient in maintaining pollutant concentrations within standard safety limits. An optimization of the initial ventilation system was realized, but CFD results and on-site measurements have shown that high local concentrations were still present. Two local exhaust methods have been proposed and analysed in order to improve the quality of the air inside the hall. A CFD approach has been used for the preliminary design process. The results indicate that both local exhaust solutions offer great improvements over the general dilution-based system, but only one can be applied.

scholarly journals Center-Line Velocity Change Regime in a Parallel-Flow Square Exhaust Hood

2020 ◽  
Vol 17 (12) ◽  
pp. 4485
Author(s):  
Jianwu Chen ◽  
Longzhe Jin ◽  
Zhenfang Chen ◽  
Bin Yang ◽  
Yanqiu Sun ◽  
...  
Keyword(s):  
Experimental Data ◽  
Ventilation System ◽  
Flow Characteristics ◽  
Calculated Data ◽  
Parallel Flow ◽  
Velocity Variation ◽  
Center Line ◽  
Exhaust Hood ◽  
Velocity Change ◽  
Air Supply

A parallel-flow exhaust hood is an effective ventilation device to control dust and toxic pollutants and protect the occupational health of workers, whether it is used alone or combined with a uniform air supply hood in a push–pull ventilation system. Some scholars have studied the outside air flow characteristics of the conventional exhaust hood with non-uniform air speed at the hood face, but the law of velocity variation outside the parallel-flow exhaust hood is not clear at present. Therefore, this paper uses the dimensionless method to study the center-line velocity change regime in a parallel-flow square exhaust hood based on simulation and experimental data. The results show that the dimensionless center-line velocity has a good change law with the characteristic length of exhaust hood in a parallel-flow square exhaust hood, which can eliminate the influence of hood face velocity and the hood size on the velocity change regime; and the experimental data is basically consistent with the calculated data, which shows that the regression equation method is reliable.

scholarly journals Investigation of the Energy Saving Efficiency of a Natural Ventilation Strategy in a Multistory School Building

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1746 ◽  
Author(s):  
Beungyong Park ◽  
Sihwan Lee
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Natural Ventilation ◽  
Cfd Simulation ◽  
Ventilation System ◽  
Internal Heat ◽  
High Energy ◽  
Ventilation Strategy ◽  
Opening And Closing ◽  
Ventilation Rates

Under-ventilation and high energy consumption are some of the problems associated with school classrooms. Thus, it is necessary to develop a ventilation strategy that is characterized by high energy-saving and ventilation efficiency. To this end, this study aims to investigate natural ventilation as a possible strategy to improve the indoor environment while reducing ventilation loads and maintaining energy costs during intermediate seasons. Ventilation and cooling load reductions based on the opening and closing of several windows were analyzed. Window flow coefficients and ventilation rates were measured and used for computational fluid dynamics (CFD) simulation to obtain pressure coefficients for 16 wind directions. The results obtained showed that the improved natural ventilation strategy could be used to effectively establish required indoor conditions (26 °C, 60% RH). Additionally, compared with the mechanical ventilation system with variable refrigerant flow, this natural strategy resulted in a decrease in energy consumption of approximately 30%. However, its application requires that internal heat gain and CO2 emissions, which depend on human population density, as well as the room usage schedule should be considered.

Sign in / Sign up

Export Citation Format

Share Document