High-efficiency parallel-plate wet scrubber (PPWS) for soluble gas removal

Wet Scrubber Performance Optimization Application Assisted With Electrochemical-Based Ammonia Sensors

“…An average efficiency of wet scrubber was around 47%. The existing wet scrubber average efficiency data shows the low efficiency of the wet scrubber, compared to the theoretical specification of the wetscrubber by 99% (Chien et al, 2015), besides that in the existing wet scrubber, the ammonia tendency to be discharged through the chimney is still above the quality standard.…”

Honeycomb Wet Scrubber For Acidic Gas Control: Modeling And Long-term Test Results 

“…These gases are also precursors for secondary inorganic components in PM2.5 [7] which is considered as a major health-risk concern in many countries [8]. Wet scrubbers (WSs) are widely used to control the emission of the acidic gases [9][10][11] due to their small footprint, simple structure, and low capital cost [12]. However, the measured removal efficiency (RE) of most of the traditional WSs can't meet the required value of greater than 95% [1].…”

“…The removal efficiency could increase from 82.8% to 97.5% as the L/G ratio was increased from 1.5 to 3.0 L m -3 [26]. However, a higher L/G ratio will cause a higher pressure drop [11,23]. Adding surfactants in the scrubbing liquid can help enhance the removal efficiency of the WSs due to the charge generation on the water surface by surfactants but the surfactants are costly [10].…”

“…The overall efficiency of a packed WS for NH3, HF, and HCl (Cin = 0.2-3 ppmv) was reported to increase from 56% to 83% at 1.1 s residence time and 10 CMM flow rate when surfactants were added [9,10]. The pH of the scrubbing solution is another factor that affects the removal efficiency of the WSs for some weak acidic gases such as CH3COOH but not for strong acidic gases such as HCl [11]. There is no significant effect on the removal efficiency for CH3COOH when the pH is higher than 7.5 due to the gas dissolution limit while the removal efficiency for HCl and HNO3 is nearly constant for the pH ranging from 7-9 [11,27].…”

“…The pH of the scrubbing solution is another factor that affects the removal efficiency of the WSs for some weak acidic gases such as CH3COOH but not for strong acidic gases such as HCl [11]. There is no significant effect on the removal efficiency for CH3COOH when the pH is higher than 7.5 due to the gas dissolution limit while the removal efficiency for HCl and HNO3 is nearly constant for the pH ranging from 7-9 [11,27]. To achieve good efficiency for mixed acidic gases and save the operating cost, the pH of scrubbing liquid should be maintained > 7.5.…”