WO2023033193A1 - Chaudière comprenant une structure de protection thermique - Google Patents

Chaudière comprenant une structure de protection thermique Download PDF

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Publication number
WO2023033193A1
WO2023033193A1 PCT/KP2022/000053 KP2022000053W WO2023033193A1 WO 2023033193 A1 WO2023033193 A1 WO 2023033193A1 KP 2022000053 W KP2022000053 W KP 2022000053W WO 2023033193 A1 WO2023033193 A1 WO 2023033193A1
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WO
WIPO (PCT)
Prior art keywords
heat
heat shield
boiler
container
transfer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KP2022/000053
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English (en)
Inventor
Hyon Il KIM
Hyon Ho Kim
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN202290000637.9U priority Critical patent/CN222560002U8/zh
Publication of WO2023033193A1 publication Critical patent/WO2023033193A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F24H9/001—Guiding means
    • F24H9/0026—Guiding means in combustion gas channels
    • F24H9/0031—Guiding means in combustion gas channels with means for changing or adapting the path of the flue gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/36—Arrangements for sheathing or casing boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B9/00—Steam boilers of fire-tube type, i.e. the flue gas from a combustion chamber outside the boiler body flowing through tubes built-in in the boiler body
    • F22B9/02—Steam boilers of fire-tube type, i.e. the flue gas from a combustion chamber outside the boiler body flowing through tubes built-in in the boiler body the boiler body being disposed upright, e.g. above the combustion chamber

Definitions

  • Boiler comprising heat shield structure
  • the present invention relates to a boiler comprising a heat shield structure.
  • heat loss of boiler due to exhaust gas is in the range of 5 to 12%, thus taking a great portion of the overall heat loss. It is therefore of great significance to reduce heat loss caused by exhaust gas.
  • the temperature of exhaust gas is set to 120-160 °C for power-generating boilers and 180-250 °C for small and medium-sized industrial or domestic boilers, respectively.
  • the object of the present invention is to provide a boiler comprising a heat-shield structure with less cost and material consumption, which can help reduce the temperature of exhaust gas to be lower than the threshold of the prior art and simultaneously prevent formation of dew point by overcoming the problems identified in the prior art.
  • One of the solutions to improve heat efficiency of boiler is to lower the temperature of exhaust gas by improving heat transfer characteristic, thus lowering heat loss due to exhaust gas.
  • a boiler comprising a heat shield structure, which can help reduce the temperature of exhaust gas to be lower than the threshold of the prior art and simultaneously prevent formation of dew point.
  • the boiler according to the present invention is a smoke-tube boiler or a water-tube boiler which is used for producing steam or hot water, mainly comprising: a boiler shell comprising a fire chamber, smoke-tubes or water-tubes, a heat-transfer-surface-of-exhaust-gas-container, a heat shield structure, and an exhaust gas container; a boiler proper cover; an exhaust gas outlet; and an exhaust gas duct.
  • the major part of heat amount of combustion gas originated from combustion of fuel in the fire chamber is transferred to heat-transfer medium through heat transfer surface by way of heat radiation, heat convection and heat conduction while combustion gas is passing along the inside of smoke-tubes or the outside of water-tubes and then finally is discharged through exhaust gas container and then through exhaust gas duct.
  • the boiler according to the present invention comprises a heat shield structure, which can help lower the temperature of exhaust gas and simultaneously prevent formation of dew point, installed to face a heat-transfer-surface-of-exhaust-gas-container inside the exhaust gas container.
  • the heat-transfer-surface-of-exhaust-gas-container means an upper tube-plate in the case of a smoke-tube boiler, or a virtual plane which touches the uppermost row of water-tubes that are farthest away from the fire chamber in the case of a water-tube boiler.
  • a cross-sectional area of the heat shield structure of the boiler equals to a cross-sectional area of the exhaust gas container minus 20 to 30% of a cross-sectional area of the fire chamber.
  • a lateral area of a virtual polyhedron which is obtained when vertically projecting the heat shield structure onto the heat-transfer-surface-of-exhaust-gas-container, is in the range of 10 to 24% of the cross-sectional area of the fire chamber.
  • the heat shield structure comprises a heat shield which can reflect residual heat of exhaust gas back to the heat-transfer-surface-of-exhaust-gas-container.
  • the heat shield structure of the boiler according to the present invention further comprises a thermal insulation layer on a side of the heat shield, which is not facing the heat-transfer-surface-of-exhaust-gas-container.
  • the heat shield structure of the boiler according to the present invention further comprises a fixing element which secures the heat shield structure to the inside of the exhaust gas container while adjusting a gap between the heat shield structure and the heat-transfer-surface-of-exhaust-gas-container.
  • the heat shield structure of the boiler of the invention may be integrated with the boiler proper cover.
  • the boiler according to the present invention has a merit of improved heat transfer characteristic and prolonged service life compared to boilers of the prior art as it can help reduce the temperature of exhaust gas to be lower than the threshold of the prior art and simultaneously prevent formation of dew point with less cost and material consumption.
  • Fig. 1 shows a three-dimensional diagram of a slanted smoke-tube boiler which comprises a heat shield structure installed inside an exhaust gas container according to an embodiment of the present invention.
  • Fig. 2 shows a schematic diagram of a slanted smoke-tube boiler which comprises a heat shield structure installed inside an exhaust gas container according to an embodiment of the present invention.
  • Fig. 3 shows a schematic diagram of a vertical smoke-tube boiler which comprises a heat shield structure installed inside an exhaust gas container according to an embodiment of the present invention.
  • Fig. 4 shows a three-dimensional diagram of a horizontal water-tube boiler which comprises a heat shield structure installed inside an exhaust gas container according to an embodiment of the present invention.
  • Fig. 5 shows a schematic diagram of a horizontal water-tube boiler which comprises a heat shield structure installed inside an exhaust gas container according to an embodiment of the present invention.
  • Fig 6 shows a schematic diagram of a slanted smoke-tube boiler wherein a heat shield structure is integrated with a boiler proper cover according to an embodiment of the present invention.
  • Fig 7 shows a schematic diagram of a horizontal water-tube boiler wherein a heat shield structure is integrated with a boiler proper cover according to an embodiment of the present invention.
  • Fig 8 shows a part drawing of a heat shield structure according to an embodiment of the present invention.
  • Fig 9 shows a schematic diagram of a slanted smoke-tube boiler wherein a heat shield structure is integrated with a boiler proper cover according to another embodiment of the present invention.
  • Fig 10 shows a schematic diagram for indicating a lateral area of a virtual polyhedron, which is obtained when vertically projecting the heat shield structure onto the heat-transfer-surface-of-exhaust-gas-container in smoke-tube boiler according to an embodiment of the present invention.
  • the heat shield structure and the slanted smoke-tube boiler, vertical smoke-tube boiler, horizontal water-tube boiler comprising the same described in examples and figures are merely specific examples which are in the range of protection of the present invention and it is not recognized as restriction to the range of protection of the present invention.
  • the cross-sectional area of the fire chamber of the boilers according to the embodiments of the present invention is 0.0346m 2 and the cross-sectional area of exhaust gas duct equals to 8% of the cross-sectional area of the fire chamber.
  • propane gas is used as fuel and water as heat-transfer medium.
  • the temperature of exhaust gas in the embodiments of the invention is measured in the space where exhaust gas outlet 7 is ended and exhaust gas duct 9 is started.
  • a smoke-tube boiler with a heat shield structure mainly comprises: a boiler shell 11 comprising a fire chamber 1, heat-transfer medium 2 surrounding the fire chamber 1, smoke tubes 5 and an upper tube-plate 3 which are heat transfer surfaces through which heat is transferred to heat-transfer medium 2, a heat shield structure 4, and an exhaust gas container 6; a boiler proper cover 8; an exhaust gas outlet 7; and an exhaust gas duct 9.
  • the exhaust gas container 6 is a space up to entrance of exhaust gas outlet 7 which is surrounded by the boiler proper cover 8 and the upper tube-plate 3.
  • the heat-transfer-surface-of-exhaust-gas-container means the upper tube plate3.
  • the reference number of “3” is equally applied to the heat-transfer-surface-of-exhaust-gas-container.
  • the heat shield structure 4 is installed to face the heat-transfer-surface-of-exhaust-gas-container 3 inside the exhaust gas container 6.
  • the cross-sectional area of the heat shield structure 4 is the same with the cross-sectional area of the heat shield 41 and equals to the cross-sectional area of the exhaust gas container 6 minus 20 to 30% of the cross-sectional area of the fire chamber.
  • the lateral area 12 of a virtual polyhedron as shown in Fig 10 which is obtained when vertically projecting the heat shield structure 4 onto the heat-transfer-surface-of-exhaust-gas-container 3, is in the range of 10 to 24% of the cross-sectional area of the fire chamber.
  • the geometric centre of the cross-section of the heat shield structure 4 is identical with that of boiler.
  • the heat shield structure 4 comprises: the heat shield 41 ; fixing element 40 which secures the heat shield structure 4 to the inside of the exhaust gas container, i.e. to the upper tube plate 3 or to the boiler proper cover 8, while adjusting the gap between the heat shield structure 4 and the heat-transfer-surface-of-exhaust-gas-container 3; and the thermal insulation layer 42 on a side of the heat shield 41 which is not facing the heat-transfer-surface-of-exhaust-gas-container 3.
  • the heat shield 41 of the heat shield structure 4 not only reflects a part of radiant energy of exhaust gas, which passes through the inside of smoke-tubes 5 and then flows out into the exhaust gas container 6, to the heat-transfer-surface-of-exhaust-gas-container 3, but intensifies convective heat transfer process during which the exhaust gas passes through in high speed along a narrow space between the heat shield 41 and the heat-transfer-surface-of-exhaust-gas-container 3.
  • stainless steel, or carbon steel, etc. may be used as a material for heat shield 41 .
  • stainless steel 1Cr18Ni9 is used.
  • Heat-resistant glass fiber, vermiculite or coal ash may be used as a material for thermal insulation layer 42, and in an embodiment of the present invention, coal ash is used.
  • the thermal insulation layer 42 of the heat shield structure 4 intensifies more the heat insulation effect of heat shield 41 .
  • the fixing elements may be secured to the heat-transfer-surface-of-exhaust-gas-container or boiler proper cover by using conventional means previously known in the art.
  • 4 fixing elements 40 are secured to the heat-transfer-surface-of-exhaust-gas-container 3 or the boiler proper cover 8 by welding for the purpose of adjusting the gap between the heat shield structure 4 and the heat-transfer-surface-of-exhaust-gas-container 3.
  • a slanted smoke-tube boiler comprises a heat shield structure 4 which is integrated with a boiler proper cover according to another embodiment of the invention.
  • the heat shield structure 4 was installed with a gap of 10mm from the heat-transfer-surface-of-exhaust-gas-container.
  • the diameter of boiler shell was 210mm, the height of boiler shell 210mm and the total heat transfer area 0.325m 2 .
  • the diameter of boiler shell was 210mm, the height of boiler shell 230mm and the total heat transfer area 0.336m 2 .
  • the initial water temperature was 16°C and the duration of test was 6 minutes from the starting time when steam is produced, respectively.
  • the temperatures of exhaust gas were 230 °C and 260 °C, respectively.
  • the table 1 shows the test results for slanted smoke tube boiler and the table 2 for vertical smoke-tube boiler.
  • St A the difference of the cross-sectional area of exhaust gas container minus the cross-sectional area of heat shield structure
  • test results show that the heat-transfer characteristic was improved and fuel burned sufficiently when the cross-sectional area of heat shield structure, i.e., the cross-sectional area of heat shield, equals to the cross-sectional area of the exhaust gas container minus 20-30% of the cross-sectional area of the fire chamber.
  • the tests were conducted in order to compare the heat transfer characteristic between the slanted smoke-tube boilers or vertical smoke-tube boilers according to lateral areas 12 of a virtual polyhedron, which is obtained when vertically projecting the heat shield structure 4 onto the heat-transfer-surface-of-exhaust-gas-container 3 under the same combustion conditions.
  • Steam produced in miniature slanted smoke-tube boilers and in miniature vertical smoke-tube boilers were collected respectively in a vessel containing 4L of water through outlet 32.
  • the diameter of boiler shell was 210mm, the height of boiler shell 210mm and the total heat transfer area 0.325m 2 .
  • the diameter of boiler shell was 210mm, the height of boiler shell 230mm and the total heat transfer area 0.336m 2 .
  • the initial water temperature was 16 °C and the duration of test was 6 minutes from the starting time when steam is produced, respectively.
  • the diameter of the heat shield structure 4, i.e. the diameter of the heat shield 41 is 180mm and the cross-sectional area of the heat shield structure 4 is equals to the cross-sectional area of exhaust gas container 6 minus 26% of the cross-sectional area of the fire chamber.
  • test results are shown in the table 3 and the table 4.
  • X ⁇ d the gap between the heat shield surface of the heat shield structure, which comprises the heat shield and thermal insulation layer, and the heat-transfer-surface-of-exhaust-gas-container; where oo means that there is no heat shield structure installed.
  • test results show that the heat-transfer characteristic was improved and fuel burned sufficiently when the lateral area of a virtual polyhedron, which is obtained when vertically projecting the heat shield structure onto the heat-transfer-surface-of-exhaust-gas-container, is in the range of 10 to 24% of the cross-sectional area of the fire chamber.
  • a water-tube boiler with a heat shield structure mainly comprises: a boiler shell 11 comprising a fire chamber 1 , heat-transfer medium 2, water-tubes 10 surrounding heat-transfer medium 2 which are heat transfer surfaces through which heat is transferred to heat-transfer medium 2, a heat-shield structure 4, and an exhaust gas container 6; a boiler proper cover 8; an exhaust gas outlet 7; and an exhaust gas duct 9.
  • the exhaust gas container 6 is a space up to entrance of exhaust gas outlet 7 which is surrounded by the boiler proper cover 8 and a virtual plane which touches the uppermost row of water-tubes that are farthest away from the fire chamber 1.
  • the heat-transfer-surface-of-exhaust-gas-container 3 means the virtual plane which touches the uppermost row of water-tubes that are farthest away from the fire chamber 1.
  • the heat shield structure 4 is installed to face the heat-transfer-surface-of-exhaust-gas-container 3 inside the exhaust gas container 6.
  • the cross-sectional area of the heat shield structure 4 is the same with the cross-sectional area of the heat shield 41 and equals to the cross-sectional area of the exhaust gas container 6 minus 20 to 30% of the cross-sectional area of the fire chamber.
  • the lateral area 12 of a virtual polyhedron which is obtained when vertically projecting the heat shield structure 4 onto the heat-transfer-surface-of-exhaust-gas-container 3, is in the range of 10 to 24% of the cross-sectional area of the fire chamber.
  • the geometric centre of the cross-section of the heat shield structure 4 is identical with that of boiler.
  • the heat shield structure 4 comprises: the heat shield 41; fixing element 40 which secures the heat shield structure 4 to the inside of the exhaust gas container, i.e. to the boiler proper cover 8, while adjusting the gap between the heat shield structure 4 and the heat-transfer-surface-of-exhaust-gas-container 3; and the thermal insulation layer 42 on a side of the heat shield 41 which is not facing the heat-transfer-surface-of-exhaust-gas-container 3.
  • the heat shield 41 of the heat shield structure 4 intensifies not only thermal radiation process of exhaust gas, which passes through outer surface of water-tubes and then flows out into the exhaust gas container 6, to the heat-transfer-surface-of-exhaust-gas-container 3, but also convective heat transfer process during which the exhaust gas passes through in high speed along a narrow space between the heat shield 41 and the heat-transfer-surface-of-exhaust-gas-container 3.
  • stainless steel, or carbon steel, etc. may be used as a material for heat shield 41 .
  • stainless steel 1Cr18Ni9 is used.
  • Heat-resistant glass fiber, vermiculite or coal ash may be used as a material for thermal insulation layer 42, and in an embodiment of the present invention, coal ash is used.
  • the thermal insulation layer 42 of the heat shield structure 4 intensifies more the heat insulation effect of heat shield 41.
  • the fixing elements may be secured to the heat-transfer-surface of-exhaust-gas-container or boiler proper cover by using conventional means previously known in the art.
  • 4 fixing elements 40 are secured to the boiler proper cover 8 by welding for the purpose of adjusting the gap between the heat shield structure 4 and the heat-transfer-surface-of-exhaust-gas-container 3.
  • a horizontal water-tube boiler comprises a heat shield structure 4 which is integrated with a boiler proper cover according to another embodiment of the invention.
  • the diameter of boiler shell was 210mm, the height of boiler shell 210mm and the total heat transfer area 0.379m 2 .
  • the initial water temperature was 16°C and the duration of test was 6 minutes from the starting time when steam is produced, respectively.
  • test results show that the heat-transfer characteristic was improved and fuel burned sufficiently when the cross-sectional area of heat shield structure, i.e., the cross-sectional area of heat shield, equals to the cross-sectional area of the exhaust gas container minus 20-30% of the cross-sectional area of the fire chamber.
  • the tests were conducted in order to compare the heat transfer characteristic between the horizontal water-tube boilers according to lateral areas 12 of a virtual polyhedron, which is obtained when vertically projecting the heat shield structure 4 onto the heat-transfer-surface-of-exhaust-gas-container 3 under the same combustion conditions.
  • the diameter of boiler shell was 210mm, the height of boiler jhell 210mm and the total heat transfer area 0.379m 2 .
  • the initial water temperature was 16“C and the duration of test was 6 minutes from the starting time when steam is produced, respectively.
  • the diameter of the heat shield structure 4, i.e. the diameter of the heat shield 41 is 180mm and the cross-sectional area of the heat shield structure 4 is equal to the cross-sectional area of exhaust gas container 6 minus 26% of the cross-sectional area of the fire chamber.
  • Table6 Comparison of heat transfer characteristics among miniature horizontal water-tube boilers according to lateral areas of a virtual polyhedron, which is obtained when vertically projecting the heat shield structure onto the heat-transfer-surface-of-exhau st-gas-container
  • test results show that the heat-transfer characteristic was improved and fuel burned sufficiently when the lateral area of a virtual polyhedron, which is obtained when vertically projecting the heat shield structure onto the heat-transfer-surface-of-exhaust-gas-container, is in the range of 10 to 24% of the cross-sectional area of the fire chamber.
  • the technical solutions according to the present invention can be used in all kinds of thermal exchange apparatus where heat radiation and heat convection exist.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Incineration Of Waste (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)

Abstract

L'invention concerne une chaudière comprenant une structure de protection thermique montée dans un récipient de gaz d'échappement (6) qui permet de réduire la température des gaz d'échappement à température inférieure à celle de l'état de la technique et d'empêcher simultanément la formation de point de rosée.
PCT/KP2022/000053 2021-09-01 2022-03-17 Chaudière comprenant une structure de protection thermique Ceased WO2023033193A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202290000637.9U CN222560002U8 (zh) 2021-09-01 2022-03-17 包括屏蔽热板构造物的锅炉

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KP202120001583 2021-09-01
KP202120001583 2021-09-01

Publications (1)

Publication Number Publication Date
WO2023033193A1 true WO2023033193A1 (fr) 2023-03-09

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PCT/KP2022/000053 Ceased WO2023033193A1 (fr) 2021-09-01 2022-03-17 Chaudière comprenant une structure de protection thermique

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CN (1) CN222560002U8 (fr)
WO (1) WO2023033193A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2017288A (en) * 1978-03-28 1979-10-03 Ygnis Sa Fluid Fuel Fire Heaters for Heating Water or a Gas
KR20010094083A (ko) * 2000-04-04 2001-10-31 임명식 소형보일러의 폐열온수기
EP1267134A2 (fr) * 2001-06-11 2002-12-18 Alley Enterprises Limited Chaudière à condensation
EP1522801A1 (fr) * 2003-10-07 2005-04-13 Daesung Industrial Corporation Absorbeur de chaleur latente pour une chaudière à gaz
JP2009052796A (ja) * 2007-08-27 2009-03-12 Miura Co Ltd ボイラ
CN102182996A (zh) * 2011-03-29 2011-09-14 张家港格林沙洲锅炉有限公司 顶喷式燃油废气组合锅炉
CN204438176U (zh) * 2015-01-28 2015-07-01 郭福洲 立式三回程燃油、燃气、燃生物质锅炉
JP2017161139A (ja) * 2016-03-09 2017-09-14 株式会社Ｉｈｉ環境エンジニアリング ボイラ装置
CN206929995U (zh) * 2017-05-23 2018-01-26 宿迁伊杉科技有限公司 一种废气保温的燃气热水装置
CN111998329A (zh) * 2020-08-26 2020-11-27 金文应 一种三回程立式燃气锅炉

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2017288A (en) * 1978-03-28 1979-10-03 Ygnis Sa Fluid Fuel Fire Heaters for Heating Water or a Gas
KR20010094083A (ko) * 2000-04-04 2001-10-31 임명식 소형보일러의 폐열온수기
EP1267134A2 (fr) * 2001-06-11 2002-12-18 Alley Enterprises Limited Chaudière à condensation
EP1522801A1 (fr) * 2003-10-07 2005-04-13 Daesung Industrial Corporation Absorbeur de chaleur latente pour une chaudière à gaz
JP2009052796A (ja) * 2007-08-27 2009-03-12 Miura Co Ltd ボイラ
CN102182996A (zh) * 2011-03-29 2011-09-14 张家港格林沙洲锅炉有限公司 顶喷式燃油废气组合锅炉
CN204438176U (zh) * 2015-01-28 2015-07-01 郭福洲 立式三回程燃油、燃气、燃生物质锅炉
JP2017161139A (ja) * 2016-03-09 2017-09-14 株式会社Ｉｈｉ環境エンジニアリング ボイラ装置
CN206929995U (zh) * 2017-05-23 2018-01-26 宿迁伊杉科技有限公司 一种废气保温的燃气热水装置
CN111998329A (zh) * 2020-08-26 2020-11-27 金文应 一种三回程立式燃气锅炉

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CN222560002U (zh) 2025-03-04

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