Chlorine Dioxide Generation

Chlorine dioxide has been used in pulp bleaching for many years. Today, with the requirements for reduction of halogenated compounds in pulp mill effluent, older chlorine dioxide plants require expansion or refurbishment; at times replacement. A. H. Lundberg, Inc., supplies complete Mathieson or Solvay process plants or replacement generator vessels, absorption towers and other system components.

Generators

Titanium generators are supplied to replace existing generators or for new plant construction. These generators incorporate Lundberg designed top entering spargers and cooling coils. This design eliminates the bottom entering gas inlets and aloxite discs commonly used for sparging dilution or reactant gases into the vessel. The elimination of lead linings and jacketed vessels improves the heat transfer from the reactants and simplifies construction.

On new construction, the generator vessel can be placed upon a flat and firm foundation. Removable through flanged nozzles on the top of the vessel, a sparger and cooling coil assembly can be inspected without draining and/or entering the generator.

Replacement generators can be constructed for installation in the same manner as the vessel that is to be replaced. The preferred replacement will also incorporate top entering spargers in order to eliminate the aloxite discs or other bottom entering nozzles.

Absorption Towers

As the capacity of an older plant is increased, the absorption tower can be pushed beyond capacity. The tower diameter and packing are the critical design features of absorption towers. Material of construction for the tower is FRP. Packing supplied is usually ceramic or stoneware.

Storage

Design and supply of chlorine dioxide solution storage tanks is also provide by A. H. Lundberg, Inc. Modern tank design incorporates a floating fiber glass pad to reduce surface exposure inside the tank. Also, venting is provided to permit sweep air to carry chlorine dioxide gas from the tank back to the absorption tower.

Consulting

A. H. Lundberg, Inc. would be pleased to provide the service of a knowledgeable engineer to assist in the review of chlorine dioxide systems and to work with the mill to develop plans for upgrading.

A.H. Lundberg, Inc., 2803 Hewitt Ave., PO. Box 1506, Everett, WA 98206. Tel: 425-258-4617; Fax: 425-259-1037.