Study on the Removal of Fine Particles from Gas Steam Using Water in a Rotating Packed Bed Combined with a Charged Device

Abstract

The work herein describes a novel technique, a rotating packed bed (RPB) combined with a charged device, to remove fine particles from gas steam. Experiments were carried out to investigate the effects of different operating conditions, including the packing type, packing thickness, rotation speed, gas–liquid volumetric ratio, initial fine particle concentration, and voltage, on the removal efficiency of fine particles from a gas stream. Results show that total removal efficiencies of fine particles and particles with a size of less than 2.5 μm (PM2.5) can reach up to 99 and 96%, respectively, under the operating conditions of packing thickness of 60 mm, rotation speed of 1000 rpm, gas–liquid volumetric flow ratio of 400, voltage of 40 kV, and use of a fine metal gauze packing. In addition, a correlation to predict PM2.5 removal efficiency was established, and results show that the predicted values of outlet PM2.5 concentrations are in agreement with experimental data, with deviations of ±20%. This work demonstrates that the removal process of fine particles has a low pressure drop and higher removal efficiency of fine particles. Consequently, it provides a fast and efficient alternative approach for removal of fine particles from gas steam.

Removal model of fine particles from the flue gas of the coal‐fired power plant in a water‐sparged aerocyclone

“…The increase of U L leads to the increase of strength and inertia force of the jetting water column, and the penetration depth and interaction with the air stream also increases, which results in stronger collisions of FP with liquid droplets. In addition, When the air inlet velocity ( U G ) was fixed, the higher U L means a higher liquid‐gas flux ratio and more jetting water per unit time will contact and collide with the air/dust stream, which increases the collision probability of FP with liquid droplets, leading to an increase of RE FP . Moreover, higher U L also results in a larger effective gas‐liquid interfacial area that also benefits for the removal of FP in the WSA reactor…”

“…For the comprehensive consideration of treatment cost and removal efficiency of FP, wet dedusting methods exhibit many advantages such as high FP removal efficiency, low treatment cost, and the wastewater and exhaust gas can be treated simultaneously, or simultaneous removal of SO 2 and FP . However, in the conventional wet dedusting devices function via a gravity‐driven approach, the FP removal efficiency is limited by the collision probability between the liquid phase and fine particles.…”

“…However, in the conventional wet dedusting devices function via a gravity‐driven approach, the FP removal efficiency is limited by the collision probability between the liquid phase and fine particles. An effective method to strengthen the wet dedusting process is using high‐gravity technology . The water‐sparged aerocyclone developed by our group is a static high‐gravity equipment, which takes the advantage of the coupling effect of the gas cyclone and liquid jet fields, and was used for FP removal in this paper.…”