Valmet Technologies Oy

Metso Power Oy

Ari Saarela

Hannu Koskela

Kalle Salmi

Kari Haaga

Jussi Nyman

Taisto Rajala

A chemical recovery boiler (), including a furnace (), comprising a front wall (), a back wall (), and the back wall () comprising a nose arch (). The boiler further comprises at least one superheater () arranged in upper part of the furnace (), and a screen pipe system (), comprising an obliquely arranged screen pipe section () positioned before/under the at least one superheater () in the furnace (). The obliquely arranged screen pipe section () comprises screen pipes () ascending (i) either from the front wall () to the back wall (), and arranged to turn back in a turn () from the back wall () and extend obliquely upwards from the back wall (), or (ii) from the back wall () to the front wall (), and arranged to turn back in a turn () from the front wall () and extend obliquely upwards from the front wall (). The screen pipe system () further comprises a vertically arranged screen pipe section () extending from the obliquely arranged screen pipe section (). The screen pipes () of the vertically arranged screen pipe section () are arranged to extend parallel with the at least one superheater () in upper part of the furnace ().

Chemical recovery boiler

A cleaning unit for smelt spouts of a recovery boiler. A motorized cleaning member is configured to clean smelt spouts of a recovery boiler. A motorized transfer device is configured to transfer the cleaning unit from the location of a first smelt spout to the location of a second smelt spout.

Cleaner equipment for the smelt spouts of a recovery boiler

A method for improving the operation safety of the smelt spout area of a recovery boiler, which smelt spout area comprises a working area (), as well as smelt spouts () connected to the lower part of the boiler for directing the smelt from the boiler to a dissolving tank (). In the method the smelt spouts () are separated from the working area () by a shielding wall () arranged movable in relation to the smelt spouts. The invention also relates to a smelt spout area of a recovery boiler.

Shielding arrangement for the smelt spout area of a recovery boiler

A cleaning apparatus for a smelt spout of a recovery boiler, which apparatus comprises a motorized cleaning member () for cleaning the smelt spout (). The cleaning apparatus further comprises a path () and a cleaning unit, which comprises motorized transfer means for transferring the cleaning unit to the location of the smelt spout () along the path.

Growing community of inventors

Lempäälä, Finland

Ari Saarela