Boiler Heat Exchanger

Patent metadata

Field	Value
Publication number	US-2019271463-A1
Application number	US-201815911966-A
Country	US
Kind code	A1
Filing date	Mar 5, 2018
Priority date	Mar 5, 2018
Publication date	Sep 5, 2019
Grant date	—

Abstract

A coil assembly for a combustion chamber includes a first tube arranged into a plurality of inner coils and a second tube arranged into a plurality of outer coils that surround the plurality of inner coils. Each inner coil contacts adjacent inner coils. The plurality of outer coils are separated from adjacent outer coils by a plurality of spaces. The first and second tubes are configured to transport a heat transfer fluid (HTF). The plurality of inner coils are separated from the plurality of outer coils by a gap. The coil assembly also includes a cylindrical shroud surrounding at least a portion of the coil assembly. The cylindrical shroud has a length that is less than a length of the coil assembly.

First claim

What is claimed is:

1 . A system, comprising:
a combustion chamber comprising a first end and a second end opposite the first end; a burner configured to introduce a flame into the first end of the combustion chamber, the flame generating a flue gas that flows from the flame towards the second end; a coil assembly within the combustion chamber, the coil assembly comprising:
a first tube arranged into a plurality of inner coils, the plurality of inner coils contacting adjacent inner coils to prevent the flue gas from passing between the plurality of inner coils; and
a second tube arranged into a plurality of outer coils that surround the plurality of inner coils, the plurality of outer coils being separated from adjacent outer coils by a plurality of spaces, wherein:
the first and second tubes are configured to transport a heat transfer fluid (HTF); and
the plurality of inner coils are separated from the plurality of outer coils by a first gap;

a cylindrical shroud surrounding at least a portion of the coil assembly, the cylindrical shroud comprising a length that is less than a length of the coil assembly; and a flue gas roller configured to redirect the flue gas into a first flue gas portion and a second flue gas portion, the first flue gas portion flowing towards the first end of the combustion chamber in the first gap between the plurality of inner coils and the plurality of outer coils, the second flue gas portion flowing towards the first end of the combustion chamber in a second gap between the plurality of outer coils and the cylindrical shroud.

2 . The system of claim 1 , wherein the plurality of inner coils and the plurality of outer coils are coaxial.

3 . The system of claim 1 , wherein the plurality of inner coils and the plurality of outer coils are each welded to a plurality of support bars.

4 . The system of claim 1 , wherein the first tube and the second tube comprise substantially equal lengths.

5 . The system of claim 1 , wherein the flue gas roller is circular in shape.

6 . The system of claim 1 , wherein the flue gas roller is solid metal.

7 . The system of claim 1 , wherein the flue gas roller comprises an internal chamber for holding a portion of the HTF.

8 . The system of claim 1 , further comprising a plurality of spacers welded between adjacent outer coils in order to provide the plurality of spaces between the plurality of outer coils.

9 . A combustion chamber, comprising:
a first end and a second end opposite the first end; an inner helically-coiled tube comprising a plurality of inner coils, the plurality of inner coils contacting adjacent inner coils; and an outer helically-coiled tube comprising a plurality of outer coils that surround the plurality of inner coils, the plurality of outer coils being separated from adjacent outer coils by a plurality of spaces, wherein:
the inner and outer helically-coiled tubes are configured to transport a heat transfer fluid (HTF); and
the plurality of inner coils are separated from the plurality of outer coils by a first gap;
a cylindrical shroud surrounding at least a portion of the outer helically-coiled tube; and a flue gas redirection element configured to redirect flue gas travelling towards the second end of the combustion chamber into a first flue gas portion and a second flue gas portion, the first flue gas portion flowing towards the first end of the combustion chamber in the first gap between the plurality of inner coils and the plurality of outer coils, the second flue gas portion flowing towards the first end of the combustion chamber in a second gap between the plurality of outer coils and the cylindrical shroud.

10 . The combustion chamber of claim 9 , wherein the plurality of inner coils and the plurality of outer coils are coaxial.

11 . The combustion chamber of claim 9 , wherein the plurality of inner coils and the plurality of outer coils are each welded to a plurality of support bars.

12 . The combustion chamber of claim 9 , wherein the inner and outer helically-coiled tubes comprise substantially equal lengths.

13 . The combustion chamber of claim 9 , wherein the flue gas redirection element is circular in shape.

14 . The combustion chamber of claim 9 , wherein:
the flue gas redirection element is solid metal; or the flue gas redirection element comprises an internal chamber for holding a portion of the HTF.

15 . The combustion chamber of claim 9 , further comprising a plurality of spacers welded between adjacent outer coils in order to provide the plurality of spaces between the plurality of outer coils.

16 . A coil assembly for a combustion chamber, the coil assembly comprising:
a first tube arranged into a plurality of inner coils, each inner coil contacting adjacent inner coils; a second tube arranged into a plurality of outer coils that surround the plurality of inner coils, the plurality of outer coils being separated from adjacent outer coils by a plurality of spaces, wherein:
the first and second tubes are configured to transport a heat transfer fluid (HTF); and
the plurality of inner coils are separated from the plurality of outer coils by a gap; and
a cylindrical shroud surrounding at least a portion of the coil assembly, the cylindrical shroud comprising a length that is less than a length of the coil assembly.

17 . The coil assembly of claim 16 , wherein the plurality of inner coils and the plurality of outer coils are coaxial.

18 . The coil assembly of claim 16 , wherein the plurality of inner coils and the plurality of outer coils are each welded to a plurality of support bars.

19 . The coil assembly of claim 16 , wherein the first tube and the second tube comprise substantially equal lengths.

20 . The coil assembly of claim 16 , further comprising a plurality of spacers welded between adjacent outer coils in order to provide the plurality of spaces between the plurality of outer coils.

Assignees

• Therma Stor Llc

Inventors

• Dancey Larry L
• Myerholtz Jr Robert M
• Rinzel Micah

Classifications

• F22B21/26 Primary

  bent helically, i.e. coiled · CPC title

• F22B3/02

  involving the use of working media other than water · CPC title

• F22B35/08

  of forced-circulation type · CPC title

• F23J15/06

  of coolers · CPC title

• F23M9/003 Primary

  in flue gas ducts · CPC title