Air curtain dust-collecting technology: Investigation of industrial application in tobacco factory of the air curtain dust-collecting system

Experimental investigation on Influencing Factors of air curtain systems barrier efficiency for mine refuge chamber

Air curtain dust-collecting technology: An experimental study on the performance of a large-scale dust-collecting system

Dust distribution and control in a coal roadway driven by an air curtain system: A numerical study

Performance evaluation for a coupled push–pull ventilation and air curtain system to restrict pollutant dispersion in a factory building

The object of research is the efficiency of dust collection of fine dust in an apparatus with an intense turbulent mode of phase interaction. One of the most problematic areas of the existing dust and gas cleaning equipment is the low efficiency of collecting fine dust. Effective cleaning of exhaust gases from dust involves the use of multi-stage cleaning systems, including wet and dry dust cleaning devices, which entails high capital and operating costs. These disadvantages are eliminated in the developed design of the cyclone-vortex dust collector with two contact zones. The device implements both dry and wet dust collection mechanisms, which allows for high efficiency of dust removal at high productivity. The conducted studies of the total and fractional efficiency of dust collection when changing the operating parameters of the developed device showed that the efficiency of collecting fine dust is 98–99 %. The increase in the efficiency of dust collection in the dry stage of the device is due to an increase in centrifugal force. In the wet stage of contact, the efficiency reaches its maximum values due to the vortex crushing of the liquid in the nozzle zone of the apparatus. Studies of the fractional efficiency of the apparatus show that with an increase in the diameter of the captured particles, the efficiency of the dust collection process for dry and wet stages, as well as the overall efficiency, increases. With an increase in the density of irrigation, the overall efficiency of dust collection in the apparatus increases. It has been established that an increase in the efficiency of capturing highly dispersed particles occurs due to turbulent diffusion, the value of which is determined by the frequency of turbulent pulsations and the degree of entrainment of particles during the pulsating motion of packed bodies. To describe the results obtained, a centrifugal-inertial model for a dry contact stage and a turbulent-diffusion model of solid particle deposition for a wet contact stage are proposed, which make it possible to calculate the dust collection efficiency of the contact stages, as well as the overall efficiency of the cyclone-vortex apparatus. The results obtained show the prospects of using devices of this design at heat power plants and other industries.

ABSTRACTThe complexity of urban tunnel structure increases the risk of tunnel fire, and the air curtain system plays an important role in controlling the spread of fire smoke and ensuring the safety of personnel. Based on theoretical analysis and tunnel model experiments, the isolation effect of different air curtain jet conditions on high‐temperature fire smoke in bifurcated tunnel was studied. The results show that the air curtain system can effectively isolate the high‐temperature smoke. For different firepower, compared to angle and thickness, wind speed has the best control effect on high‐temperature smoke. The control effect of air curtain thickness takes second place. The effect of angle change is the least obvious. Meanwhile, based on the analysis of experimental results, it was found that when the air curtain parameters are selected as wind speed of 2.5 m/s, angle of 15°, and thickness of 0.16 m, the air curtain system has better smoke prevention efficiency. Finally, dimensionless analysis yielded a power law equation relating upstream temperature rise, firepower, and wind speed. This supports theoretically analyzing the air curtain's smoke prevention effect.

Numerical Simulation of Environmental Control for Relics Preservation in the Funerary Pit by Air Curtain System

The model of a traditional vortex apparatus in a program complex is constructed and constructive changes of such apparatuses are proposed. The adequacy of the constructed model in comparison with the existing traditional vortex apparatus is evaluated. The conclusion about the important influence of the design solution on the efficiency of dust collection is made. It is revealed that due to insignificant changes in the angle of inclination of the gas stream inlet, there is an increase in the fractional efficiency, approximately by 4–7 %.

HighlightsThe rice dust collection performance of bag filters was investigated.The pressure drop and rice dust collection efficiency were measured with various parameters.Correlation equations are suggested for the pressure drop across a clean filter medium and across the dust cake.Abstract. Because rice dust constitutes a form of air pollution, bag filters are widely used in rice processing facilities. Rice dust has various particle sizes, and the dust concentration in air is low with rice dust. Research on the rice dust collection performance of bag filters is necessary for effective dust collection in rice processing facilities. The objective of this study was to investigate the rice dust collection performance of bag filters. The pressure drop and rice dust collection efficiency were measured with various face velocities, dust concentrations, and fabric filter media. The dust collection efficiency decreased slightly with increases in the face velocity and in the maximum pressure drop in normal conditions. In addition, correlation equations of the pressure drop across a clean filter medium and across the dust cake are suggested to predict the pressure drop in overloaded conditions in rice processing facilities. The average error was 20.2%, and it decreased with increasing pressure drop. Using the correlation equations, bag filters can be managed to remove the deposited dust before the pressure drop significantly increases or reaches its maximum value. Keywords: Bag filter, Dust collection efficiency, Pressure drop, Rice dust.

In this paper, parametric study of wet electrostatic precipitator applied to ducted heat pump system was conducted. For the experiment, a dust collecting module was designed and a prototype was manufactured. The airflow rate, the applied voltages of the charging and collecting part were selected as the main parameters in the limited condition. The dust collection efficiency was measured according to the change of the parameter values and the influence of each parameter was analyzed. As a result, the contribution of each parameter on the dust collection efficiency was analyzed as 22.7% airflow rate, 6.6% applied voltage in charging part and 69.9% applied voltage in collecting part. And it was found that the applied voltage of the dust collecting part had the greatest influence on the dust collection efficiency. The correlation equation was derived using the parameters and the product design was made considering this. This design and analysis process will be helpful in future large-scale design.

Creating and maintaining the microclimate in livestock buildings is associated with numerous engineering and technical challenges. Together with adequate feeding, the microclimate determines the health, reproductive ability, and production potential of the animals (obtaining a maximum amount of high-quality products). One of the deciding steps in improving the parameters of microclimate, i.e., temperature and humidity in agricultural facilities, particularly in livestock buildings, is to develop reliable and highly efficient air curtains in the vestibules. The objective of the manuscript is to investigate the parameters of the microclimate in livestock buildings using the air curtain, supported by automation and ICT technologies for rational operating modes. The presented theoretical and experimental studies on improving the microclimate parameters in livestock buildings were carried out using an innovative air curtain system. Its power is calculated based on the dimensions of the room, and the flow rate of warm air near the floor level is three times lower than at the installation site. The use of air curtains reduces consumption of thermal energy needed to maintain an optimal microclimate for livestock by 10–15%. Furthermore, the use of an automated digital control system maintains an optimal microclimate in the building. The developed energy-saving system for creating an optimal micro-climate in livestock buildings using air curtains was tested in a pigsty of the Research and Training Farm “Vorzel” of the National University of Life and Environmental Sciences of Ukraine, located in the Kiev region. The developed automated microclimate system using air curtains significantly improves the microclimate parameters and significantly reduces power consumption. The system can be further developed by adding remote control based on the Internet of Things (IoT) technology.

Air curtain systems have been proposed as a supplementary smoke control strategy for vehicle tunnels, particularly where structural constraints limit the installation or upgrading of conventional ventilation systems. However, most previous studies rely on numerical simulations or fixed experimental facilities, while flexible experimental platforms and the influence of vehicle obstruction on smoke behavior remain less explored. This study experimentally investigates the smoke confinement performance of an air curtain using a 1:18 modular detachable scaled vehicle tunnel model. The modular configuration enables flexible assembly and adjustment of the experimental setup for different test conditions. A series of laboratory experiments was conducted using a liquefied petroleum gas (LPG) burner to simulate a vehicle fire. Temperature measurements and smoke visualization were performed under different air curtain jet velocities and vehicle obstruction conditions to analyze the interaction between the air curtain jet and buoyancy-driven smoke flow. The results show that the air curtain significantly restricts the upstream propagation of hot smoke and modifies the thermal field inside the tunnel. When the jet velocity reached approximately 5 m/s, the temperature in the protected region decreased by about 25–35% compared with the case without an air curtain. In addition, the presence of vehicle models altered the airflow structure and increased heat accumulation in the middle region of the tunnel cross-section. These results demonstrate that the proposed modular tunnel model provides a reliable experimental platform for tunnel fire research and highlights the importance of considering vehicle obstruction effects in tunnel smoke control studies.

Air leakage in the goaf is a fundamental reason for the high-temperature heat damage of the coal mining face and the gas concentration in the upper corner exceeding the limit. Combined with the boundary layer theory, this study analyzes the airflow state of the coal mining face. We propose installing a new air curtain system to prevent air leakage in the goaf. The length of the intake air curtain is determined by solving the theoretical equation. Numerical simulation is used to study different layout schemes of air curtains, and the spatial distribution law of different air volumes inside the working face is analyzed. The simulation results are compared with the field-measured data. The results show that when the length of the air curtain on the air inlet side is 20 m, the wind flow on the working face can be approximated as a state of attached jet, and a diffuse turbulent flow area will be formed outside the air curtain. Gas concentration will increase in this area. The air leakage prevention effect is best when the air curtains with a length of 20 m for the inlet air and 10 m for the return air are arranged at both ends of the working face. This air curtain system can reduce the temperature of the working face and the gas concentration in the upper corner and has certain guiding significance for the air leakage prevention work in the goaf.

In this study, a tunnel temperature field model test bed is built according to the similarity principle to study the variation law of temperature in the tunnel in the cold season. According to the variation law of temperature in the tunnel, a new active thermal insulation measure, namely, an air curtain system, is developed. According to the principle of flow function superposition and heat balance, the governing equation of air curtain system is obtained. Taking the Zhengpantai tunnel as an example, the feasibility of the air curtain system is verified, and the jet angle of air curtain is optimized. The research results show that outside temperature and surrounding rock temperature are the main factors affecting the temperature field of tunnels in cold regions. The calculation results show that the air curtain system can effectively prevent tunnel freezing damage. The optimal jet angle of air curtain system should be 30°–40°. When the outside temperature is extremely low, multiple air curtains can be used in series to heat the temperature in the tunnel, and it is recommended that the distance between the two air curtains is not less than 20 m.

Time characteristics of dust collection and particle classification performance of a cyclone