Arrangement in recovery boiler

• US 7,434,543 B2
• Filed: 04/05/2006
• Issued: 10/14/2008
• Est. Priority Date: 04/25/2005
• Status: Active Grant

• Current Assignee: Kvaerner Power Oy (Valmet Oyj)
• Original Assignee: Kvaerner Power Oy (Valmet Oyj)
• Inventors: Raukola, Antti, Mäntyniemi, Jussi
• Primary Examiner(s): Wilson; Gregory A
• Application Number:
  US11/398,461
• Publication Number:
  US 20060249098A1
• Time in Patent Office: 923 Days
• Field of Search: 122/7.R, 122/460, 122/461, 122/467, 122/468, 122/474, 122/475, 122/477, 122/485
• US Class Current: 122/7.00R
• CPC Class Codes: D21C 11/12 Combustion of pulp liquors
• CPC Class Codes: Y02P 70/10 Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Abstract

The invention relates to an arrangement in a recovery boiler, into which spent liquor to be combusted and combustion air are fed, the arrangement comprising superheaters in the upper part of the recovery boiler for recovering heat. Instead of screen tubes the invention is provided with a superheater formed of horizontal elements.

Claims

1. An arrangement in a recovery boiler, into which spent liquor to be combusted and combustion air are fed, the arrangement comprising superheaters in the upper part of the recovery boiler for recovering heat, wherein below the superheaters in the upper part of the recovery boiler there is provided a substantially horizontal superheater, which is formed of superheater elements formed of substantially horizontal superheater tubes vertically overlapping one another and of transversally parallel superheater elements in the recovery boiler such that substantially all flue gases created in the furnace of the recovery boiler flow through the superheater formed of the substantially horizontal superheater elements,

wherein the horizontal superheater is arranged to operate as a primary superheater of the recovery boiler.

2. An arrangement as claimed in claim 1, wherein the superheater elements of the superheater are mounted between a nose of the furnace and the front wall transversely in relation to the front wall and supported from the ends thereof on the side of the nose and correspondingly on the side of the front wall.

3. An arrangement as claimed in claim 1, wherein the superheater elements of the superheater are mounted between the nose and the front wall in the direction of the front wall and supported from the ends thereof on the side of the side walls.