Scrubbing of HCl Gas from Synthesis Gas in a Multistage Dual-Flow Sieve Plate Wet Scrubber by Alkaline Solution

Abstract

The synthesis gas leaving from the coal gasification process is having particulate matter and other gaseous pollutants majorly hydrogen sulphide and hydrogen chloride (HCl). Wet scrubbers can simultaneously remove the gaseous pollutants and dust particles from effluent gas streams. Dual-flow sieve plate column wet scrubbers can be used for the removal of acid gases from the exhaust gases. A three stage lab scale dual-flow sieve plate scrubber has been designed, fabricated and installed. Experiments were conducted to remove the HCl from the synthesis gas at different gas-liquid ratios within the gas flow rates (Q G ) 8. 3 NaOH solution. A semi empirical model has been developed to predict the efficiency of the HCl scrubbing using the experimental results and the variables which show the impact on the scrubber performance. Almost 80% of the experimental results are matched well with the predicted values with less than ± 15% deviation.

Underground Diesel Exhaust Wet Scrubbers: Current Status and Future Prospects

“…Also, in their worthwhile review Besagni et al [28] explained in detail all the possible flow regimes in the bubble column and which parameters could affect it. For example, flow characteristics might be measured using various techniques such as the photographic method [5], X-ray [7], PIV [10,37], optical fiber probe [38], conductivity probe [39], pressure transducer [20,[40][41][42], electrical capacitance tomography [43], and acoustic probe [44,45].…”

“…Another 10% to 14% increment of absorption was achieved by heating carbon dioxide, which was based on the heat energy generated from the reaction between water and carbon dioxide. Under a certain amount of hydrogen chloride (HCl) concentration, increasing the inlet gas flow rate would result in a reduction in HCL removal [37]. Therefore, choosing a wet scrubber size depends mainly on the exhaust gas flow rate, as it limits the amount of scrubbing liquid [38].…”

Honeycomb wet scrubber for acidic gas control: modeling and long-term test results

“…The RE of a conventional packed WS increased with increasing inlet concentration at low inlet concentration (C in ) and approached a constant value until C in reached a certain value for HF, HCl, HNO 3, HNO 2 , and CH 3 COOH [14]. For example, the RE of a multistage dual-flow sieve plate WS was 93.8% as C in was as high as 100-300 ppmv for HCl [15] while a packed tower was found to have a RE of less than 90% when C in was lower than 1.0 ppmv for HF and HCl [9,14]. The WSs normally have high pressure drop resulting in high power consumption and operation cost [13,16].…”

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

“…The removal efficiency of a conventional packed WS increased with the increasing inlet concentration at low inlet concentration (Cin) and approached a constant value until Cin reached a certain value for HF, HCl, HNO3, HNO2, and CH3COOH [14]. For example, the removal efficiency of a multistage dual-flow sieve plate WS was 93.8% as Cin was as high as 100-300 ppmv for HCl [15] while a packed tower was found to have a removal efficiency of less than 90% when Cin was lower than 1.0 ppmv for HF and HCl [9,14]. The WSs normally have high pressure drop resulting in high power consumption and operation cost [13,16].…”