Johan H Jansen, Age 883966 112Th Ave NE, Bellevue, WA 98004

4940004, Jul 10, 1990

Jul 7, 1989

7/376824

Johan H. Jansen - Bellevue WA

J. H. Jansen Company, Inc. - Woodinville WA

F23L 500

1101825

Recovery boiler wind boxes are upgraded by providing an air nozzle and damper installation where the nozzle crosses through the inside of the wind box. Air is channeled from the box into the nozzle by the damper. The nozzle is convergent and jets air into the boiler's combustion chamber. The typical boiler has a plurality of combustion air ports leading into the chamber. Modifying each air port by using the nozzle and damper installation creates a surrounding arrangement of air jets about the chamber which creates turbulent mixing in the boiler's furnace gases.

5246542, Sep 21, 1993

Sep 18, 1991

7/761634

Theodore M. Fosberg - Seattle WA
Johan H. Jansen - Bellevue WA

D21C 1100

162 29

The invention disclosed here is a process or system for treating the effluent from a BCTMP pulp mill. The effluent is evaporated to produce a water condensate and a remaining waste product concentrate. The condensate is recycled for use in the BCTMP mill, or is dumped into the environment. The concentrate is incinerated in a recovery boiler. Incineration results in the recovery of certain reusable chemicals. At least some of such chemicals are fed back into the effluent while it is being evaporated, to buffer it, and thereby prevent the carryover of undesirable organic acids into the condensate. This ensures sufficient condensate purity for recycling it in the BCTMP process, or for otherwise dumping it into the environment.