Tran Industrial Research Inc.

Other

Thor Technology Corporation

3003442 Canada Inc.

471199 Ontario Limited

Hoc N Tran

Javad Mostaghimi

James W Smith

Douglas W Reeve

Mohomed I Jameel

Donald E Cormack

Sodium hydroxide is formed from sodium sulphate by a three step operation comprising converting the sodium sulphate to sodium sulphide, converting the sodium sulphide to sodium bicarbonate, and converting the sodium bicarbonate to sodium hydroxide. The operations preferably are effected in conjunction with a bleached kraft pulp mill operation, so as to utilize by-product sodium sulphate from chlorine dioxide generation to produce useful sodium hydroxide as sulphur without co-producing chlorine.

Process of producing sodium hydroxide from sodium sulphate in a pulp mill

A nozzle suitable for use with a device for removal of deposits from contaminated surfaces, such as a sootblower in a heat recovery boiler, is designed to avoid normal shock wave formation, and hence energy dissipation, by achieving a condition whereby, the emergent steam pressure (p.sub.e) is related to the ambient pressure (p.sub.oo) by the relationship p.sub.e /p.sub.oo &lt;about 2, preferably about 1. A compact design achieving this result and able to function over a wide range of flow rates comprises a cylindrical body with a downstream convergent outlet and a rounded-head conical insert located axially in the body with its maximum dimension generally coinciding with the commencement of convergence of the outlet and extending through the outlet.

Advanced sootblower nozzle design

A two-zone lime mud calciner is provided for processing lime mud from kraft pulp recovery operations. A conveyer is employed for conveying lime mud horizontally through the calciner. The first zone and second zone of the calciner each contains a dielectric hysteresis heating device for first drying the lime mud in the first zone and then decomposing the dried lime mud to lime and carbon dioxide. A co-current flow of purge air removes steam generated in the first zone and a counter-current flow of purge air removes carbon dioxide generated in the second zone with a vent being provided adjacent the upstream and of the second zone.

Microwave heating device for lime and calcining

Deinking by-product from wastepaper recycling operations and pulp mill clarifier sludge are incorporated into drywall or other gypsum-based building products, such as building blocks. The deinking by-product or pulp mill clarifier sludge is diluted and mixed with stucco (calcium sulfate hemihydrate). The resulting slurry preferably is subjected to an initial dewatering, following the on-set of hardening of the gypsum, and drywall or other building product is formed from the dewatered material. A significant loading of fibrous material in the drywall sheet or other gypsum product is achieved using the procedure, imparting improved flexural strength to the product. The preferred procedure also may be used to incorporate virgin or recycled wood pulp into the building product.

Utilization of deinking by-product in building materials

Lime mud from kraft pulp recovery operations is processed using dielectric hysteresis heating, in a two-stage operation, in which wet lime mud first is dried then the dried lime mud is decomposed to lime and carbon dioxide. A two-zone lime mud calciner is employed in which the lime mud is conveyed horizontally, with drying being effected in the first zone and then decomposition being effected in the second zone. A co-current flow of purge air removes steam generated in the first zone and a counter-current flow of purge air removes carbon dioxide generated in the second zone.

Lime mud calcining using dielectric hysteresis heating

A nozzle suitable for use with a device for removal of deposits from contaminated surfaces, such as a sootblower in a heat recovery boiler, is designed to avoid normal shock wave formation, and hence energy dissipation, by achieving a condition whereby, the emergent steam pressure (p.sub.e) is related to the ambient pressure (p.sub..infin.) by the relationship p.sub.e /p.sub.28 &lt;about 2, preferably about 1. A compact design achieving this result and able to function over a wide range of flow rates comprises a cylindrical body with a downstream convergent outlet and a rounded-head conical insert located axially in the body with its maximum dimension generally coinciding with the commencement of convergence of the outlet and extending through the outlet.

A deposit measuring device, useful for improving combustion processes especially kraft mill recovery boilers, determines the temperature at the windward and leeward sides of a probe tube positioned in the flue gas stream transverse thereto and then determines the rate of build-up of deposits on at least the windward side and the temperature of the flue gas stream. This information is used by an operator or automatically to control boiler operations. The measuring device has a deposit removal means associated therewith periodically to remove deposits from the tube. The ability to control the boiler operation enables considerable economic benefits to be achieved.

Growing community of inventors

Toronto, Canada

Hoc N Tran