Gas-gas high-temperature heat exchanger

Patent metadata

Field	Value
Publication number	US-11287194-B2
Application number	US-201716632382-A
Country	US
Kind code	B2
Filing date	Aug 2, 2017
Priority date	Jul 26, 2017
Publication date	Mar 29, 2022
Grant date	Mar 29, 2022

Abstract

The present discloses a gas-gas high-temperature heat exchanger, including a shell (12), a tube sheet (5), a low-temperature gas inlet pipeline (6) and an outlet pipeline (7), and a high temperature gas outlet (8), the tube is divided into a first heat transfer zone (1) and a second heat transfer zone (2), a low temperature gas (4) flows in the tube, the tube includes a insert component (9) and an outer fin (10); a heat transfer tube in the second heat transfer zone (2) has a sleeve structure, a high-temperature gas (3) flows in the core tube (13), the low temperature gas (4) flows in an annular region between the core tube (13) and an outer tube (14), the high-temperature gas (3) flows out of the core tube (13) and flows into the shell-side area of the second heat transfer zone (2) again.

First claim

The invention claimed is:

1. A gas-gas high-temperature heat exchanger, comprising
a shell ( 12 ), a tube plate ( 5 ), a low-temperature gas inlet pipeline ( 6 ) and an outlet pipeline ( 7 ), and a high-temperature gas outlet ( 8 ), wherein
the gas-gas high-temperature heat exchanger is divided into a first heat transfer zone ( 1 ) and a second heat transfer zone ( 2 ),
a high-temperature gas ( 3 ) and a low-temperature gas ( 4 ) in the first heat transfer zone ( 1 ) are cross-flowing,
a first-zone tube is disposed in the first heat transfer zone ( 1 ), the low-temperature gas ( 4 ) flows in the first-zone tube, the first-zone tube includes a first insert component ( 9 ) inside the first-zone tube and an outer fin ( 10 ) outside the first-zone tube;
a sleeve structure is disposed in the second heat transfer zone ( 2 ), wherein the sleeve structure includes a core tube ( 13 ) and an outer tube ( 14 ) disposed outside the core tube ( 13 ), and an annular region is disposed between the core tube ( 13 ) and an outer tube ( 14 ), the high-temperature gas ( 3 ) flows in the core tube ( 13 ), the low-temperature gas ( 4 ) flows in the annular region, a flow direction of the high-temperature gas ( 3 ) flowing in the core tube ( 3 ) is opposite to a flow direction of the low-temperature gas ( 4 ) flowing in the annular region,
the high-temperature gas ( 3 ) flows out of the core tube ( 13 ) and flows into a shell-side area of the second heat transfer zone ( 2 ), the high-temperature gas ( 3 ) in the shell-side area of the second heat transfer zone has a flow direction cross with that of the low-temperature gas ( 4 ), and
the core tube ( 13 ) includes a second insert component ( 9 ), the annular area includes inner fins ( 11 ).

2. The gas-gas high-temperature heat exchanger according to claim 1 , wherein
the high-temperature gas ( 3 ) is high-temperature flue gas, the low-temperature gas ( 4 ) is air, the high-temperature gas ( 3 ) sequentially flows through the first heat transfer zone ( 1 ), the core tube ( 13 ), and the shell-side of the second heat transfer zone ( 2 ), and
the low-temperature gas ( 4 ) flows through the annular region in the second heat transfer zone ( 2 ) and the first-zone tube in the first heat transfer zone ( 1 ).

3. The gas-gas high-temperature heat exchanger according to claim 1 , wherein
the outer tube ( 14 ) in the second heat transfer zone ( 2 ) includes fins outside the outer tube ( 14 ).

4. The gas-gas high-temperature heat exchanger according to claim 1 , wherein
the number of longitudinal corrugations on the inner fins ( 11 ) gradually increases along the flow direction of the low-temperature gas ( 4 ).

5. The gas-gas high-temperature heat exchanger according to claim 1 , wherein
a surface of the tube plate ( 5 ), and an inner wall of the shell ( 12 ) includes an insulation layer.

6. The gas-gas high-temperature heat exchanger according to claim 1 , wherein
the inner fins ( 11 ) have a corrugated shape or straight shape.

7. The gas-gas high-temperature heat exchanger according to claim 1 , wherein
the inner fins ( 11 ) includes a hole or a slit.

8. The gas-gas high-temperature heat exchanger according to claim 1 , wherein
the outer fin ( 10 ) is H-type fin, circular fin, or integrated fin.

9. The gas-gas high-temperature heat exchanger according to claim 1 , wherein
the outer fin ( 10 ) includes a hole, a slit, a longitudinal vortex generator, or shutter.

10. The gas-gas high-temperature heat exchanger according to claim 1 , wherein
the first insert component ( 9 ) and the second insert component ( 9 ) have a twisted tape shape, and are inserted in the first-zone tube and the core tube ( 13 ), respectively.

11. The gas-gas high-temperature heat exchanger according to claim 1 , wherein
the first insert component ( 9 ) and the second insert component ( 9 ) include a hole, a slit or an airfoil structure.

Assignees

• Univ Xi An Jiaotong

Inventors

• Wang Qiuwang
• Zhang Pan
• Ma Ting

Classifications

• F28F1/42 Primary

  the means being both outside and inside the tubular element · CPC title

• F28D21/001

  for thermal power plants or industrial processes · CPC title

• F28D2021/0056

  for ovens or furnaces · CPC title

• F28D7/106

  consisting of two coaxial conduits or modules of two coaxial conduits · CPC title

• F28F1/30

  the means being attachable to the element (F28F1/32 takes precedence) · CPC title