Mist Removal Research Articles

Image Haze Removal Based Dark Channel Prior

This paper describes the image based on dark channel prior to fog. Dark colors from the statistical laws of outdoor priori no fog image database, it was such a key observation was based on the fact that - the vast majority of each local area outdoor image without fog are present strength of certain of at least one color channel low value pixels. Using this model building, directly estimate the concentration of fog and mist removal recover high quality interference image. Experiments show that the dark channel prior to remove the image haze becomes simple and effective.

Influence of liquid and gas flow rates on sulfuric acid mist removal from air by packed bed tower

The possible emission of sulfuric acid mists from a laboratory scale, counter-current packed bed tower operated with a caustic scrubbing solution was studied. Acid mists were applied through a local exhaust hood. The emissions from the packed bed tower were monitored in three different categories of gas flow rate as well as three liquid flow rates, while other influencing parameters were kept almost constant. Air sampling and sulfuric acid measurement were carried out iso-kinetically using USEPA method 8. The acid mists were measured by the barium-thorin titration method. According to the results when the gas flow rate increased from 10 L/s to 30 L/s, the average removal efficiency increased significantly (p < 0.001) from 76.8 ± 1.8% to 85.7 ± 1.2%. Analysis of covariance method followed by Tukey post-hoc test of 92 tests did not show a significant change in removal efficiency between liquid flow rates of 1.5, 2.5 and 3.5 L/min (p = 0.811). On the other hand, with fixed pressure loss across the tower, by increasing the liquid/gas (L/G) mass ratio, the average removal efficiency decreased significantly (p = 0.001) from 89.9% at L/G of <2 to 83.1% at L/G of 2–3 and further to 80.2% at L/G of >3, respectively. L/G of 2–3 was recommended for designing purposes of a packed tower for sulfuric acid mists and vapors removal from contaminated air stream.

Numerical simulation of vapor flow and pressure drop across the demister of MSF desalination plant

This paper presents a numerical simulation of the water vapor flow in an MSF flash chamber along with the pressure drop across the demister. The demister is a simple porous blanket of metal wires mesh (usually made of stainless steel wires) which retains liquid droplets entrained by the vapor momentum to enhance the quality of the product water. Two main areas of concern in wire mesh mist eliminators are; (i) the pressure drop and (ii) the mist removal efficiency. The present simulation focuses only on the pressure drop across the demister. The simulation is carried out considering a full scale flashing chamber of a typical operational MSF desalination plant and of a real industrial demister dimensions. The study simulates the demister as porous media flow. It takes into account the vapor velocity, the dimension of the demister, its porosity and wire thickness. The obtained pressure drop was found to be within a reasonable agreement with the published literature data and it follows a trend compatible with Ergun’s equation as well as the empirical correlation of Svendsen.

자동차 내부의 김서림 감지 및 제거를 위한 최적의 조건

For mist sensing, temperature-humidity sensor is attached on six positions of front glass and rearview mirror in automobile. Bottom-left side of front glass is the best position where mist is sensing. For mist removal, air conditioner is turned on intensity 1, 3 and is set the temperature at 17[℃], 25[℃]. And heater is turned on intensity 1, 3 and is set the temperature at 25[℃], 32[℃]. The best condition which mist is removed is temperature at 17[℃] and intensity 3 of air conditioner mode. At this condition, total average value of humidity output voltage difference is 0.561[V]. Also, air conditioner mode is effective than heater mode for mist sensing and removal.

Removal of airborne hexavalent chromium mist using chitosan gel beads as a new control approach

Airborne hexavalent chromium is a known human respiratory carcinogen and allergen. Many workers are exposed to hexavalent chromium in various processes which chromium electroplating plants are the most common. In this study, the feasibility of a new control approach to remove this pollutant using chitosan beads as a biosorbent was investigated. Hexavalent chromium sorption was studied relative to pH, pollution concentration, sorbent concentration, temperature, and air velocity using one factor at a time approach and Taguchi experimental design. Polluted air with different chromium mist concentrations (10-5000 µg/m 3 ) was contacted to chitosan beads (3.3-20 g/L), floating in distilled water with adjusted pH (3-7), using an impinger at different temperatures (20 and 35 °C), and various velocities (1.12 and 2.24 m/s). The ANOVA test result showed that, there were statistical significant differences between factor levels except optimized pH levels. The higher ions removal efficiencies were achieved at lower levels of air velocities, pollution concentrations, and higher levels of solution pH values, temperatures, and sorbent concentrations.

Law Predicting the Time Required to Achieve Clear Vision on Misted Transparent Inorganic Materials Irradiated by an Electron Beam

In this work, we report a new and simple, but very useful, electron beam (EB) method for preventing the misting of inorganic materials. A law is suggested to predict the time required to achieve clear vision on misted transparent inorganic materials irradiated by an electron beam. Since the time to clear vision before the mist removal treatment (τ o ) is largely dominated by the thermal conductivity (λ), the time to clear vision (τ c ) as a function of EB irradiation dose (D E B ) can be expressed by the following equation (τ c - τ 0 = (dτ c /dD E B )D E B ). Here, an initial rate (dτ c /dD E B ) of the time to clear vision against EB irradiation doses below 0.2 MGy is defined and evaluated for sapphire lens, silica glass and diamond windows. The initial rate for silica glass (6.5 x 10 - 5 s/Gy) is 6 ′ 0.5 times higher than those of sapphire lens (1.2 x 10 - 5 s/Gy) and diamond windows (1.0 x 10 - 5 s/Gy). Charging, dangling bond formation and terminal atom conversion are the main factors in the success of the EB treatment for mist removal. When the contribution of adsorbed atom conversion and charging to the overall rate are 1.0 x 10 - 5 s/Gy and 0.2 × 10 - 5 s/Gy respectively, the contribution of dangling bonds should be 5.3 × 10 - 5 s/Gy.

충격식 코로나 방전 플라즈마를 이용한 배연가스로부터 먼지제거에 대한 특성

On the basis of the distribution of particle size measured by laser diffraction spectrometers, this research was carried out to investigate the characteristics of mist removal with the change of operating condition in the plasma reactor of impulse streamer corona. The operating parameters in this experiment were power of impulse streamer corona, gas velocity, impulse generation time, gas temperature, and SOx/NOx concentration. The collection efficiency T(d) was estimated by the distribution of particle size in the collection zone through the advanced model.

EV-Mist Removal Wire Cleaning System

There has been a remarkable increase in the PM speed from approx. 800m/min in the 1970's to the current speeds of over 1, 700 m/min. Several factors have contributed to this development which began when the fourdriniers changed to fourdriniers with top formers and were followed by gap former machines.Because of this revolutionary development in paper machine speed there are more and more demands put on the paper machine runnability. One special area where runnability problems are having serious results is the wire section. This article concentrates on highlighting the mist as a cause of wire section runnability and paper quality problems and how these problems are eliminated by the Mist Removal System developed by EV Group Oy.

Controlling emissions stemming from the hot air solder leveling process

The oil, flux, and solder added to a hot air solder leveling tool creates an emission of oil mist, acidic gases, and solid metal compounds. The oil tends to form into very fine droplets, resulting in exhaust opacity. Diffusion type fiber bed filters are the optimal choice for the removal of oil mist. For optimal filter efficiency the exhaust stream should be cooled. A wet scrubber upstream of the filter will cool the exhaust stream through water evaporation. Additionally, the scrubber will remove acid vapor and coarse solids from the exhaust. The characteristic quality of a coalescing fiber bed filter is its ability to continuously drain liquid. The defining parameter in the service life of a fiber bed filter is the solids in the exhaust stream. These solids can lodge in the fibers and block a portion of the void area, and hence increase the filter pressure drop. In an attempt to extend filter life, a study was conducted for the use of detergents to clean the filter. These studies show that a detergent can extend filter life in the H.A.S.L. application by removing a blocking agent from the filter. Further tests are planned at additional locations to examine the performance at sites that use other ingredient formulations in the flux, oil, and solder.

Studies on Removal of Radioactive Mist by Plate Column

Studies on Removal of Radioactive Mist by Plate Column

Studies on Removal of Radioactive Mist by Plate Column

The authors have made a study on entrainment, in which the probability of mist passing through a plate is considered. A mathematical analysis was performed for large diameter column, that is, one in which consideration is given to backmixing in a plate column. The analysis and subsequent examination have revealed that the decontamination factor D.F. increases as the state of the liquid changes from a condition of complete mixing to that of plug flow.

Removal of acid mist

Removal of acid mist

The removal of mist by centrifugal methods

The removal of mist by centrifugal methods