Heat exchanger, boiler, and setting method for heat exchanger

Patent metadata

Field	Value
Publication number	US-10955201-B2
Application number	US-201916256256-A
Country	US
Kind code	B2
Filing date	Jan 24, 2019
Priority date	Jan 25, 2018
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

The present invention provides an economizer 70 including a plurality of cylindrical heat transfer tubes 71 a - 71 d extending along a crossing direction crossing a flowing direction of combustion gas and disposed at a predetermined disposition interval P along the flowing direction, the combustion gas and fluid flowing in the plurality of heat transfer tubes performing heat exchange, and a swirl preventing section 75 disposed in contact with a downstream side outer circumferential surface 71 Aa- 71 Ad in the flowing direction of each of the plurality of heat transfer tubes 71 a - 71 d and configured to prevent a swirl of the combustion gas from occurring near the downstream side outer circumferential surface 71 Aa- 71 Ad.

First claim

The invention claimed is:

1. A heat exchanger comprising:
a plurality of cylindrical heat transfer tubes extending in a direction which crosses a flowing direction of a combustion gas, the plurality of heat transfer tubes being disposed at a predetermined disposition interval along the flowing direction, such that heat exchange is performed between a fluid flowing in the plurality of heat transfer tubes and the combustion gas; and
a swirl preventing section disposed in contact with a downstream side outer circumferential surface, relative to the flowing direction, of each of the plurality of heat transfer tubes and configured to prevent a swirl of the combustion gas from occurring near the downstream side outer circumferential surface, the swirl preventing section being disposed in contact with the downstream side outer circumferential surface in a range of 120° or more and 180° or less along the downstream side outer circumferential surface.

2. The heat exchanger according to claim 1 , wherein the predetermined disposition interval is 1.5 times or more an outer diameter of one of the heat transfer tubes.

3. The heat exchanger according to claim 1 , wherein the swirl preventing section includes a fireproof material including at least any one of SiO 2 , Al 2 O 3 , and SiC.

4. The heat exchanger according to claim 3 , further comprising a holding section configured to hold the fireproof material, the holding section being disposed between a pair of the heat transfer tubes, the pair of the heat transfer tubes being adjacent to each other in the flowing direction.

5. The heat exchanger according to claim 1 , wherein the swirl preventing section is a tube body extending in a longitudinal axial direction of the heat transfer tubes so as to cross the flowing direction of the combustion gas.

6. A heat exchanger comprising:
a plurality of cylindrical heat transfer tubes extending in a direction which crosses a flowing direction of a combustion gas, the plurality of heat transfer tubes being disposed at a predetermined disposition interval along the flowing direction, such that heat exchange is performed between a fluid flowing in the plurality of heat transfer tubes and the combustion gas; and
a swirl preventing section disposed in contact with a downstream side outer circumferential surface, relative to the flowing direction, of each of the plurality of heat transfer tubes and configured to prevent a swirl of the combustion gas from occurring near the downstream side outer circumferential surface,
wherein the swirl preventing section is disposed in contact with both
the downstream side outer circumferential surface of a first heat transfer tube among the heat transfer tubes, and
an upstream side outer circumferential surface, relative to the flowing direction, of a second heat transfer tube among the heat transfer tubes, the second heat transfer tube being disposed adjacent to the first heat transfer tube on a downstream side of the first heat transfer tube in the flowing direction.

7. A heat exchanger comprising:
a plurality of cylindrical heat transfer tubes extending in a direction which crosses a flowing direction of a combustion gas, the plurality of heat transfer tubes being disposed at a predetermined disposition interval along the flowing direction, such that heat exchange is performed between a fluid flowing in the plurality of heat transfer tubes and the combustion gas;
a swirl preventing section disposed in contact with a downstream side outer circumferential surface, relative to the flowing direction, of each of the plurality of heat transfer tubes and configured to prevent a swirl of the combustion gas from occurring near the downstream side outer circumferential surface; and
a holding section disposed between a pair of the heat transfer tubes, the pair of the heat transfer tubes being adjacent to each other in the flowing direction,
wherein the swirl preventing section includes a fireproof material including at least any one of SiO 2 , Al 2 O 3 , and SiC, and the holding section is configured to hold the fireproof material, and wherein the holding section includes
a first bar-like member made of metal, both end portions of which are welded to the pair of heat transfer tubes, and
a second bar-like member made of metal welded to the first bar-like member and disposed to cross the first bar-like member.

8. A boiler comprising a heat exchanger that performs heat exchange with combustion gas generated in a furnace,
wherein the heat exchanger includes:
a plurality of cylindrical heat transfer tubes extending in a direction which crosses a flowing direction of a combustion gas, the plurality of heat transfer tubes being disposed at a predetermined disposition interval along the flowing direction, such that heat exchange is performed between a fluid flowing in the plurality of heat transfer tubes and the combustion gas; and
a swirl preventing section disposed in contact with a downstream side outer circumferential surface, relative to the flowing direction, of each of the plurality of heat transfer tubes and configured to prevent a swirl of the combustion gas from occurring near the downstream side outer circumferential surface, the swirl preventing section being disposed in contact with the downstream side outer circumferential surface in a range of 120° or more and 180° or less along the downstream side outer circumferential surface.

9. A setting method for a heat exchanger, comprising:
disposing a plurality of cylindrical heat transfer tubes at a predetermined disposition interval along a flowing direction of a combustion gas, the plurality of cylindrical heat transfer tubes extending in a direction which crosses the flowing direction of the combustion gas, such that heat exchange is performed between a fluid flowing in the plurality of heat transfer tubes and the combustion gas; and
disposing a swirl preventing section so as to be in contact with a downstream side outer circumferential surface, relative to the flowing direction, of each of the plurality of heat transfer tubes, the swirl preventing section being configured to prevent a swirl of the combustion gas from occurring near the downstream side outer circumferential surface, the swirl preventing section being disposed in contact with the downstream side outer circumferential surface in a range of 120° or more and 180° or less along the downstream side outer circumferential surface.

Assignees

• Mitsubishi Hitachi Power Sys
• Mitsubishi Power Ltd

Inventors

• Yamasaki Yoshinori

Classifications

• F28D1/0477 Primary

  the conduits being bent in a serpentine or zig-zag · CPC title

• F28F19/00

  Preventing the formation of deposits or corrosion, e.g. by using filters {or scrapers} · CPC title

• F22G1/02

  with heat supply by hot flue gases from the furnace of the steam boiler · CPC title

• F28F1/12

  the means being only outside the tubular element · CPC title

• F28F2215/10

  Secondary fins, e.g. projections or recesses on main fins · CPC title