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 (η_FA) is achieved at 19.36 × 10⁻⁴ Nm³/s gas flow rate (Q_G) and 48.183 × 10⁻⁶ m³/s liquid flow rate (Q_L) at 25 × 10⁻³ kg/Nm³ inlet fly-ash loading (C_FA,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%.

KEYWORDS:

• Air pollution control
• multi-stage sieve plate
• particulate matter
• removal efficiency
• wet scrubber

Funding

The authors thankfully acknowledge the sponsor, Department of Science and Technology (DST), Government of India(GOI), Indian Institute of Technology (IIT) Kharagpur, India for giving financial support (sanction No: DST/INT/SA/P-14/2011).