TURBOSCRUBBER® - BLEACH PLANT SCRUBBER APPLICATION, 19PEERS

New scrubbing and stripping applications in pulp and paper mills have been made possible by the introduction of fluidized-bed mass-transfer towers employing asymmetrical fluidization elements. Element shapes have been developed and deployed in multiple industries which create tumbling motion generating improved pressure gradients and enhanced surface renewal rates resulting in improved mass transfer rates over both fixed-contact and symmetrical-element fluidized-bed contacting equipment. There is considerable scope for reducing tower diameters for new installations or for retrofitting existing units where improvements in absorption or stripping efficiency are required. Removal of small particulate matter is improved by the motion. A particular advantage of the tumbling fluidized motion is its strong resistance to plugging by particulates. Asymmetric-element fluidized bed scrubbing technology provides absorption, particulate removal and heat transfer in one unit. These characteristics are being introduced in several applications in the pulp and paper industry.

Pulp and paper plants around the world are facing increased pressure from environmental agencies and stakeholders to reduce emissions in the form of ClO₂ and sometimes Cl₂. It is standard to measure and report these emissions during continuous operation, but many producers are also experiencing increasingly stringent emission targets for the duration of plant start-up. During plant start-up many plants experience spikes in ClO₂ concentrations, and the “green plume” or stack opacity from ClO₂ slippage can be a concern. Currently the pulp and paper industry uses mostly two kinds of scrubbers for bleach plant vent gases, packed bed scrubbers or horizontal-duct mist scrubbers. Packed bed scrubbers plug often and require a shutdown for high pressure cleaning whereas horizontal-duct mist scrubber nozzles are prone to nozzle plugging. The use of E-stage filtrate as a scrubbing medium is extensively pursued by the industry as it is freely available but is not widely practiced due to fibers creating problems for both types of scrubbers. Asymmetric-element fluidized bed scrubbing technology allows use of E-stage filtrate while circumventing plugging issues.  

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