US 10,323,842 B2Granted

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

AssigneeSumitomo SHI FW Energia Oy

InventorJohn Murphy

Life of this patent

Estimating the term…

Loading patent…

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.

Claims21

Dependent claims

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

(a) providing multiple metal tubes, each comprising a first end portion, a second end portion, and a central portion between the first end portion and the second end portion, wherein each of the first end portion and the second end portion has an outer surface and a substantially constant outer diameter OD1, and the central portion has an outer surface with a circumferentially extending recess encircling the outer surface, whereby the central portion has a rotation symmetrical outer surface with a substantially constant outer diameter OD2, that is less than the outer diameter OD1;
(b) providing a circumferentially extending metal coating having a substantially constant thickness of at most a depth D of the circumferentially extending recess, wherein D is (OD1−OD2)/2, on the outer surface of the central portion to blanket the circumferentially extending recess;
(c) arranging the multiple metal tubes in a plane in parallel to each other;
and
(d) forming the watertube panel portion by continuously welding a fin between each pair of adjacent, in parallel arranged, metal tubes.

2 more elements

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

multiple metal tubes, each comprising a first end portion, a second end portion, and a central portion between the first end portion and the second end portion, wherein each of the first end portion and the second end portion has an outer surface and a substantially constant outer diameter OD1;
a circumferentially extending recess formed in the central portion of the multiple metal tubes to encircle the outer surface of the central portion, whereby the central portion has a rotation symmetrical outer surface with a substantially constant outer diameter OD2, that is less than the outer diameter OD1;
a circumferentially extending metal coating having a constant thickness of at most a depth D of the circumferentially extending recess, wherein D is (OD1−OD2)/2, to blanket the circumferentially extending recess of each of the multiple metal tubes, the multiple metal tubes being 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.

Facts

Application: 15/448,852Filed 3 Mar 2017
Published: US 2018/0252405 A16 Sep 2018
Granted: 18 Jun 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

F22B 31/0038
With tubes surrounding the bed or with water tube wall partitions: with tubes in the bed
B23P 15/26
Making specific metal objects by operations not covered by a single other subclass or a group in this subclass: heat exchangers or the like
F22B 31/003
For boilers of the water tube type: with tubes surrounding the bed or with water tube wall partitions
F22B 31/0084
With combustion in a fluidized bed: with recirculation of separated solids or with cooling of the bed particles outside the combustion bed