Removal of fly-ash and dust particulate matters from syngas produced by gasification of coal by using a multi-stage dual-flow sieve plate wet scrubber

Abstract

In this work, fly-ash water scrubbing experiments were conducted in a three-stage lab-scale dual-flow sieve plate scrubber to observe the performance of scrubber in fly-ash removal at different operating conditions by varying the liquid rate, gas rate and inlet fly-ash loading. The percentage of fly-ash removal efficiency increases with increase in inlet fly-ash loading, gas flow rate and liquid flow rate, and height of the scrubber; 98.55% maximum percentage of fly-ash removal efficiency (ηFA) is achieved at 19.36 × 10(-4) Nm(3)/s gas flow rate (QG) and 48.183 × 10(-6) m(3)/s liquid flow rate (QL) at 25 × 10(-3) kg/Nm(3) inlet fly-ash loading (CFA,i). A model has also been developed for the prediction of fly-ash removal efficiency of the column using the experimental results. The predicted values calculated using the correlation matched well with the experimental results. Deviations observed between the experimental and the predicted values were less than 20%.

Removal of Cement Dust Particulates via Fully Submerged Self‐Primed Venturi Scrubber

“…This can be explained by higher inertial impaction, which occurs to greater particle density along with more inter‐particle interaction, leads to more removal per unit volume of scrubbing liquid. [ 26 ] At the low concentration of 0.05 g m −3 , as shown in Figure 4 , the removal efficiency is not that remarkable or remains constant. The experimental results as shown in the graphs indicate that the maximum removal rate of 99.77% is achieved at the throat gas velocity of 60 m s −1 , at a constant liquid height of 100 cm, and a constant inlet cement dust concentration of 3.1 g m −3 .…”

“…[ 14 ] This increases the liquid hold‐up as well as the interfacial area in the liquid column. [ 26 ] It was observed that the higher was the fraction of liquid at the throat section, the higher was the percentage removal of the target solid particulates owing to the PM absorption mechanism. [ 27 ] This mainly occurs because the high relative velocity between the solid and liquid fractions causes the formation of a large number of tiny droplets.…”

Synergistic removal of dust using the wet flue gas desulfurization systems

“…The dimensional analysis was used to reduce the number of independent variables using the Buckingham п-theorem [30] as follows:ηsp=k0ηp(RtVGρGμg×A)normala(RtVLρLμl×A)normalb(c0ρG)normald(HRt)normale,where A is the cross-sectional area of the scrubber (m 2 ). A is equal to Rt 2 and e with the value of 0.485 [30]. The other exponents in equation (4.3) were obtained using the multiple linear regression analysis as follows:a=0.079;1emb=0.075;1emd=−0.02;…”

“…The exponents of parameters in this model are different from those of the Swarm model [30] because the Swarm model was used for the multistage sieve-tray column without considering η p . Compared with the models represented by equation (2.12) and equation (2.13), the novel model equation (4.4) is based on the theoretical dust removal efficiency η p and revised by other running parameters.…”

Experimental investigation on flue gas purification and gas‐liquid multiphase flow in a spraying column with perforated plate

“…[11] Consequently, a significant amount of work has been done to change the local flow pattern in the scrubber of the WFGD system. Various scrubbers have been designed to improve the PM removal efficiency, such as the multi-stage tray scrubber, [16] multi-stage bubble column, [20] swirl cyclone scrubber, [21,22] spray-cumbubble scrubber, [23] modified turbulent scrubber, [24] and fixed valve tray column. [25] The particle removal efficiency was reported to be up to 95% for sizes larger than 2 μm.…”