Spray scrubber for nanoparticle removal from incineration fumes from the incineration of waste containing nanomaterials: Theoretical and experimental investigations

Abstract

Nanomaterials (NMs) are currently treated via recycling, incineration and/or landfilling at their end-of-life. Little is known about the fate of NMs in incineration systems and the efficiency of the available flue-gas cleaning technologies (FGCT) in these systems on the removal of NMs before stack release. In combination with other FGCT such as cyclones, electrostatic precipitator or bag filters, scrubbers participate to limit the release of particulate matter (PM) into the atmosphere. No study has been carried out to investigate wet scrubber collection efficiency regarding nanoparticles under conditions found in a waste incineration plant. In the present study, experimental campaigns were carried out to quantify the performance of a pilot-scale spray scrubber regarding the removal of nanoparticles. The pilot was designed with respect to geometrical, hydrodynamic and residence time scale similitude and operated in gas temperature and humidity conditions representative of full-scale scrubbers in hazardous waste incineration plants. A collection efficiency of 45-62% for a particle size range of 12-90 nm was reported. To evaluate the experimental results, an existing PM collection model based on the 3 main particle collection mechanisms of diffusion, interception and impaction, was adapted for extreme humidity and gas temperature conditions typical of a waste incineration plant. A comparison of the experimental and theoretical results was made indicating that the model results were in good agreement with the experimental results. Contrary to prior studies, the impaction-dominant region occurred at smaller particle sizes (0.1-0.2 mm) corresponding to Stokes number 9 Â 10 À3 to 4 Â 10 À2 . Numerically, the contribution of the interception mechanism in the collection of nanoparticles (particle sizes 1-100nm) was found to be negligible (i.e., Interception number 2 Â 10 À5 to 2 Â 10 À3 ).

Nanoparticles Technology for Improving Steam-Assisted Gravity Drainage Process Performance: A Review

“…Nanomaterials have so many applications in different markets; for that reason they are expected to grow at an average annual rate of 13.1% from 2020 to 2027. 346 However, the implementation of this technique in the EOR area has many concerns. The major technical and economic matter is the field-scale production of the material.…”

An Efficient Method for Heat Recovery Process and燭emperature燨ptimization

“…Using the waste heat of the flue gas to preheat the air entering the unit can increase the temperature of the cold primary and secondary air entering the air preheater, which is beneficial to the stable combustion in the boiler and improves the efficiency of the boiler [27]. Reference [28] conducted a numerical simulation on the synergistic dust removal performance of the desulfurization tower. The results showed that when the flue gas temperature at the inlet of the desulfurization tower decreased to 85°C, the removal efficiency of the particles in the flue gas of the desulfurization tower changed very little.…”