Hybrid high temperature insulation

Patent metadata

Field	Value
Publication number	US-9593797-B2
Application number	US-201514610786-A
Country	US
Kind code	B2
Filing date	Jan 30, 2015
Priority date	Jan 30, 2015
Publication date	Mar 14, 2017
Grant date	Mar 14, 2017

Abstract

According to one aspect, a hybrid high temperature thermal insulation includes a mix of inorganic granules. The granular mix includes at least 70 weight percent porous inorganic granules in the form of expanded perlite, and at most 30 weight percent second porous inorganic granules other than expanded perlite. The hybrid insulation also includes a binder. In example formulations, the second porous inorganic particles may be made from crushed aerogel, from fumed silica, from precipitated silica, or from other substances. The hybrid insulation may be formed into preferred shapes, for example a board shape or a semi-cylindrical shape configured to fit over a round tube of a predetermined diameter.

First claim

What is claimed is:

1. A hybrid high temperature thermal insulation, comprising:
a mix of inorganic granules, the mix comprising at least 70 weight percent first porous inorganic granules in the form of expanded perlite, and at most 30 weight percent second porous inorganic granules, the second porous inorganic granules being other than expanded perlite; and
a binder;
wherein the insulation has a density of between 9 and 16 lbs/ft 3 .

2. The hybrid high temperature thermal insulation of claim 1 , wherein the second porous inorganic granules comprise aerogel particles.

3. The hybrid high temperature thermal insulation of claim 2 , wherein the second porous inorganic granules comprise silica aerogel particles.

4. The hybrid high temperature thermal insulation of claim 3 , wherein the mix comprises about 5 weight percent silica aerogel particles.

5. The hybrid high temperature thermal insulation of claim 3 , wherein the mix comprises about 10 weight percent silica aerogel particles.

6. The hybrid high temperature thermal insulation of claim 3 , wherein the mix comprises about 30 weight percent silica aerogel particles.

7. The hybrid high temperature thermal insulation of claim 6 , wherein the silica aerogel particles have a particle size of between 0.01 and 1.2 millimeters.

8. The hybrid high temperature thermal insulation of claim 1 , wherein the second porous inorganic granules comprise fumed silica particles.

9. The hybrid high temperature thermal insulation of claim 8 , wherein the mix comprises about 10 weight percent hydrophobic fumed silica.

10. The hybrid high temperature thermal insulation of claim 8 , wherein the mix comprises about 10 weight percent hydrophilic fumed silica.

11. The hybrid high temperature thermal insulation of claim 1 , wherein the second porous inorganic granules comprise precipitated silica particles.

12. The hybrid high temperature thermal insulation of claim 8 , wherein the mix comprises about 10 weight percent hydrophobic precipitated silica.

13. The hybrid high temperature thermal insulation of claim 1 , wherein the binder is sodium silicate.

14. The hybrid high temperature thermal insulation of claim 1 , further comprising reinforcing fibers.

15. The hybrid high temperature thermal insulation of claim 1 , wherein the insulation has a thermal conductivity of less than 0.6 BTU-in/(ft 2 -h-° F.) when measured at 500° F.

16. The hybrid high temperature thermal insulation of claim 1 , wherein the insulation has a thermal conductivity of less than 0.5 BTU-in/(ft 2 -h-° F.) when measured at 500° F.

17. The hybrid high temperature thermal insulation of claim 1 , wherein the second porous inorganic granules are hydrophobic.

18. The hybrid high temperature thermal insulation of claim 17 , wherein the second porous inorganic granules comprise an organic coating that renders the second porous inorganic granules hydrophobic.

19. The hybrid high temperature thermal insulation of claim 1 , wherein the second porous inorganic granules are hydrophilic.

20. The hybrid high temperature thermal insulation of claim 1 , wherein the mix comprises at least 80 weight percent expanded perlite.

21. The hybrid high temperature thermal insulation of claim 1 , wherein the mix comprises at least 85 weight percent expanded perlite.

22. The hybrid high temperature thermal insulation of claim 1 , wherein the mix comprises at least 90 weight percent expanded perlite.

23. The hybrid high temperature thermal insulation of claim 1 , wherein the mix comprises at least 94 weight percent expanded perlite.

24. A hybrid thermal insulation, comprising:
a mix of inorganic granules, the mix comprising at least 70 weight percent first porous inorganic granules in the form of expanded perlite, and at most 30 weight percent second porous inorganic granules, the second porous inorganic granules being other than expanded perlite; and
a binder;
wherein the insulation has a thermal conductivity of less than 0.6 BTU-in/(ft 2 -h-° F.) when measured at 500° F.

25. The hybrid thermal insulation of claim 24 , wherein the insulation has a density of between 9 and 16 lbs/ft 3 .

26. The hybrid thermal insulation of claim 25 , wherein the second porous inorganic granules comprise aerogel particles.

27. The hybrid thermal insulation of claim 25 , wherein the second porous inorganic granules comprise silica aerogel particles.

28. A method of making thermal insulation, the method comprising:
forming a mixture having at least 70 weight percent porous inorganic granules in the form of expanded perlite and at most 30 weight percent second porous inorganic granules, the second porous inorganic granules being other than expanded perlite;
adding a binder to the mixture;
pressing the mixture to a predetermined shape;
oven drying the pressed shape; and
cutting the predetermined shape to a final size.

29. The method of claim 28 , wherein pressing the mixture to a predetermined shape comprises pressing the mixture into a hollow semi-cylindrical shape configured to fit over a round tube of a predetermined diameter.

30. The method of claim 28 , wherein pressing the mixture to a predetermined shape comprises pressing the mixture into a board shape.

31. The method of claim 28 , wherein the second porous inorganic granules comprise aerogel particles.

32. The method of claim 28 , wherein the second porous inorganic granules comprise fumed silica particles or precipitated silica particles.

Assignees

• Johns Manville

Inventors

• Kulprathipanja Ames
• Dolin Rick Lee
• Lopez Severiano Almidon

Classifications

• F16L59/024 Primary

  consisting of two half sleeves · CPC title

• F16L59/04

  Arrangements using dry fillers, e.g. using slag wool · CPC title

• C04B28/00

  Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements · CPC title

• F16L59/06 Primary

  Arrangements using an air layer or vacuum · CPC title

• C04B2111/28

  Fire resistance, i.e. materials resistant to accidental fires or high temperatures · CPC title