Experimental Study on the Enhancement of Particle Removal Efficiency in Spray Tower Scrubber Using Electrospray

Abstract

There have been a lot of efforts to keep permissible emission standards and to reduce the amount of emitted air pollutants. There are several air pollution control equipments, however, wet scrubber is used to remove particulate matters and gaseous pollutants simultaneously, even if it has low collection efficiency in the particle size less than 5.0 μm. To overcome this problem, we introduced a spray tower scrubber with an electrospray system which a high voltage was indirectly applied. We found that collection efficiency of fine particles in the electrospray system was improved by increasing electrical field strength and the ratio of liquid-gas flow rate (from 41% to 84% for 0.3 μm particles). In addition, a number of small droplets generated from an electrospray system led high collection efficiency, resulting from electrostatic attraction between droplets and particles and higher collision frequency. Therefore, we can conclude that the introduction of an electrospray system is quite effective to increase the particle removal efficiency of a spray tower scrubber.

Purification characteristics of fine particulate matter treated by a self-flushing wet electrostatic precipitator equipped with a flexible electrode

“…Figure 4c also shows that the collection efficiency of particles that were less than 2 μm in diameter was larger than 60% based on a water consumption of 45 L/hr. When the gas velocity was 2.7 m/sec, the corresponding liquid-to-gas mass ratio (L/G) was 0.022 kg/kg, which is advantageous compared with other treatment processes (Carotenuto, Natale, and Lancia 2010;Kim et al 2014;Natale et al 2015;Tsai et al 2005), as shown in Table 3.…”

Present cum future of SARS-CoV-2 virus and its associated control of virus-laden air pollutants leading to potential environmental threat – A global review

“…Moreover, spray units are being installed within a prilled tower or wet scrubber to reduce the emissions of urea or PM 2.5 [186] . The application of electro-spray in a spay tower helps in removing the particulate matter <5μm having a ratio of liquid to the gas flow rate of 41-84% for an average particle diameter of 0.3μm [187] . One of the scientific research articles shows that by adopting the spray mechanism, the rain shower model is developed for sustainable and low-cost removal of CO 2 and PM 2.5 [188] .…”

Experimental Study on Particle Removal of a Wet Electrostatic Precipitator with Atomization of Charged Water Drops

“…Breakage of water droplets under an electric force has proved to be a highly efficient atomization route. It enables the droplet diameter to decrease by 50% while increasing the specific charge four times compared with a conventional mechanical atomized spray. , Charged atomization has been utilized for technical upgrades on particle capture in wet scrubbers, improving collection efficiency by 20–40% , and reducing the water consumptions . This treated method enables the formation of charged droplets with a small diameter, high density, and large relative velocity in a particle-gas flow field , and thus deserves research on particle capture but has been rarely mentioned in the literature for WESP performance improvement.…”