Combustion chamber hot face refractory lining

Patent metadata

Field	Value
Publication number	US-11795118-B2
Application number	US-202117173335-A
Country	US
Kind code	B2
Filing date	Feb 11, 2021
Priority date	Oct 7, 2016
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

A refractory lining in a combustion chamber operating in a reducing atmosphere. The lining includes at least one or more Zirconia (Zr)-based refractory lining members comprising one or more Zr-based parts. The Zr-based parts comprise at least 90 wt. %, preferably at least 95 wt. %, of monoclinic ZrO 2 and/or partially stabilized ZrO 2 and/or fully stabilized ZrO 2 , wherein the total content of tetragonal and cubic ZrO 2 amounts to at least 20 wt. %, preferably more than 35 wt. %, as well as Zr based refractory lining members and methods for manufacturing the Zr based refractory lining members.

First claim

The invention claimed is:

1. A combustion chamber operating in a reducing atmosphere comprising a refractory lining, wherein the refractory lining comprises a shaped and fired zirconia refractory material in the form of a brick based on granular CaO and/or MgO stabilized fused zirconia raw material low in silica, consisting essentially of crystalline zirconia, wherein the fired refractory material comprises a total content of tetragonal and cubic ZrO 2 measured by X-ray powder diffraction analysis of at least 20% by weight, wherein the tetragonal ZrO 2 is in the t-phase, wherein the Al 2 O 3 content is 0.05-6% by weight, and wherein the SiO 2 content of bonding phase of the material is below 1.5% by weight.

2. A combustion chamber operating in a reducing atmosphere according to claim 1 , wherein the shaped and fired zirconia refractory forms at least part of a combustion chamber refractory lining, including at least part of an inner hot face wall lining and/or a partition to downstream.

3. A combustion chamber operating in a reducing atmosphere according to claim 1 , wherein the combustion chamber is a combustion chamber for producing syngas comprising H 2 and CO.

4. A combustion chamber operating in a reducing atmosphere according to claim 1 , wherein brick has a bulk density of 3.80 g/cm 3 -5.40 g/cm 3 .

Assignees

• Haldor Topsoe As
• P D Refractories Gmbh
• Topsoe As

Inventors

• Larsen Johannes Ruben
• Brunk Fred
• Christensen Thomas Sandahl
• THOMSEN Søren Gyde

Classifications

• C04B2235/5436

  micrometer sized, i.e. from 1 to 100 micron · CPC title

• C04B2235/77

  Density · CPC title

• C04B2235/9607

  Thermal properties, e.g. thermal expansion coefficient · CPC title

• C04B2235/3208

  Calcium oxide or oxide-forming salts thereof, e.g. lime · CPC title

• C04B2235/3206

  Magnesium oxides or oxide-forming salts thereof · CPC title