US 2018/0202648 A1Published application

Watertube panel portion and a method of manufacturing a watertube panel portion in a fluidized bed reactor

AssigneesAmec Foster Wheeler Energia Oy, Pourin Welding Engineering Co., Ltd.

InventorsJohn Murphy, Haisheng LEE

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Abstract

A watertube panel portion for a fluidized bed reactor and a corresponding method. The watertube panel portion includes multiple parallel metal tubes having a tube length L1, an outer surface, an original outer diameter OD1, and an original wall thickness WT1, and a circumferentially extending recess formed in a central portion of each of the tubes, between first and second end portions. The recess has a constant depth D that is less than the wall thickness WT1. The recess encircles the outer surface of the central portion of the metal tube. A circumferentially extending metal coating has a constant thickness of at most the depth D of the recess to blanket the recess of each of the multiple metal tubes. A fin is continuously welded between each pair of adjacent tubes.

Claims20

Dependent claims

A method of manufacturing a watertube panel portion for a fluidized bed reactor, the method comprising the steps of:

(a) providing multiple metal tubes having a tube length L1, an outer surface, an original outer diameter OD1, and an original wall thickness WT1;
(b) forming a circumferentially extending recess having a constant depth D that is less than the wall thickness WT1 in a central portion of each of the multiple metal tubes, between a first end portion and a second end portion of the metal tube, wherein the recess encircles the outer surface of the central portion of the metal tube so as to have a decreased outer diameter OD2, that is less than the original outer diameter OD1, and a decreased wall thickness WT2, that is less than the original wall thickness WT1, in the central portion of the metal tube;
(c) providing a circumferentially extending metal coating having a constant thickness of at most the depth D of the recess to blanket the recess of each of the multiple metal tubes;
(d) arranging the multiple metal tubes in a plane in parallel to each other;
and
(e) forming the watertube panel portion by continuously welding a fin between each pair of adjacent in parallel arranged metal tubes.

3 more elements

A watertube panel portion for a fluidized bed reactor, the watertube panel portion comprising:

multiple metal tubes having a tube length L1, an outer surface, an original outer diameter OD1, and an original wall thickness WT1;
a circumferentially extending recess formed in a central portion of each of the multiple metal tubes, between a first end portion and a second end portion of the metal tube, the recess having a constant depth D that is less than the wall thickness WT1, wherein the recess encircles the outer surface of the central portion of the metal tube so as to have a decreased outer diameter OD2, that is less than the original outer diameter OD1, and a decreased wall thickness WT2, that is less than the original wall thickness WT1, in the central portion of the metal tube;
a circumferentially extending metal coating having a constant thickness of at most the depth D of the recess to blanket the recess of each of the multiple metal tubes, wherein the multiple metal tubes are arranged in a plane in parallel to each other;
and
a fin continuously welded between each pair of adjacent, in parallel arranged, metal tubes, so as form the watertube panel portion.

2 more elements

Dependencies are inferred from the claim text.