Wet collectors

CHAPTER 4

1. WET COLLECTORS GROUP MEMBERS: MUHAMMAD BIN KAMARUDDIN (17DAS14F1039) SITI NUR IDAYU BT. MOHAMMAD GHAZALI (17DAS14F1037) FATIN SHAHIRA NABILA BT. SHAHROM (17DAS14F1041)

2. IMPINGEMENT SCRUBBER These scrubbers usually have one to three horizontal plates, each of which has a large number of small holes. The gas stream accelerating through the holes atomizes some droplets in the water layer above the plate. Particles impacts into these water droplets.

3. Advantages & Disadvantages of impingement scrubbers Advantages Can handle flammable and explosive dusts with little risk. Provide gas absorptions and dust collection in single unit. Can handle mists. Provides cooling for hot gases. Disadvantages Effluent liquid can create water pollution problem. Waste product collected wet. High potential for corrosion problem. Disposal of waste sludge may be very expensive.

4. Spray tower This is the simplest type of particulate wet scrubber in commercial service Sets of spray nozzles located near the top of the scrubber vessel generate water droplets that impact with particles in the gas stream as the gas stream moves upwards.

5. Function : Removal of air pollutants by inertial or diffusional impaction, reaction with a sorbent or reagent slurry, or absorption into liquid solvent

6. Advantages & Disadvantages of spray tower Advantages Relatively low pressure drop. Relatively low capital cost. Relatively free from plugging Relatively small space requirement. Disadvantages May create water (or liquid) disposal problem. Waste product collected wet. Relatively low mass-transfer efficiencies. Relatively high operating costs.