EP2325560B1 - Chaudière de réchauffe - Google Patents

Chaudière de réchauffe Download PDF

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Publication number
EP2325560B1
EP2325560B1 EP09814438.9A EP09814438A EP2325560B1 EP 2325560 B1 EP2325560 B1 EP 2325560B1 EP 09814438 A EP09814438 A EP 09814438A EP 2325560 B1 EP2325560 B1 EP 2325560B1
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EP
European Patent Office
Prior art keywords
reheat
combustion gas
furnace
closing plate
reheater
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.)
Active
Application number
EP09814438.9A
Other languages
German (de)
English (en)
Other versions
EP2325560A1 (fr
EP2325560A4 (fr
Inventor
Junji Imada
Isao Uchida
Syuji Sato
Hideo Fukuda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of EP2325560A1 publication Critical patent/EP2325560A1/fr
Publication of EP2325560A4 publication Critical patent/EP2325560A4/fr
Application granted granted Critical
Publication of EP2325560B1 publication Critical patent/EP2325560B1/fr
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Classifications

    • 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
    • F22B37/40—Arrangements of partition walls in flues of steam boilers, e.g. built-up from baffles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22G—SUPERHEATING OF STEAM
    • F22G1/00—Steam superheating characterised by heating method
    • F22G1/02—Steam superheating characterised by heating method with heat supply by hot flue gases from the furnace of the steam boiler
    • F22G1/04—Steam superheating characterised by heating method with heat supply by hot flue gases from the furnace of the steam boiler by diverting flow or hot flue gases to separate superheaters operating in reheating cycle, e.g. for reheating steam between a high-pressure turbine stage and an intermediate turbine stage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22G—SUPERHEATING OF STEAM
    • F22G1/00—Steam superheating characterised by heating method
    • F22G1/16—Steam superheating characterised by heating method by using a separate heat source independent from heat supply of the steam boiler, e.g. by electricity, by auxiliary combustion of fuel oil

Definitions

  • the present invention relates to a reheat boiler having a reheat furnace and a reheater on the downstream of evaporator tubes, in which an imbalance in temperature of the combustion gas near the outlet of the reheat furnace is reduced.
  • boilers having a superheater are employed as marine boilers (see JP 2002-243106 A ).
  • conventional marine boilers use a reheat boiler having a reheat furnace and a reheater on the downstream of combustion gas.
  • FIG. 5 shows an example of the configuration of a conventional marine reheat boiler.
  • FIG. 5 is a schematic diagram showing the configuration of the conventional reheat boiler in a simple form.
  • a conventional reheat boiler 100 includes a main boiler 106 consisting of a burner 101, a furnace 102, a front tube bank 103, a superheater (superheater: SH) 104, and evaporator tubes (a rear tube bank) 105; a reheat furnace 108 having a reheat burner 107; and a reheater 109 provided on the exhaust-gas outlet side, the reheat furnace 108 and the reheater 109 being disposed on the downstream of the evaporator tubes 105.
  • a main boiler 106 consisting of a burner 101, a furnace 102, a front tube bank 103, a superheater (superheater: SH) 104, and evaporator tubes (a rear tube bank) 105; a reheat furnace 108 having a reheat burner 107; and a reheater 109 provided on the exhaust-gas outlet side, the reheat furnace
  • the combustion gas generated by combustion in the burner 101 flows from the furnace 102 through the front tube bank 103, the superheater 104, and the evaporator tubes 105 to the reheat furnace 108, where it is mixed with the reheat combustion gas from the reheat burner 107, after which the combustion gas then flows while undergoing heat exchange with the reheater 109 and is discharged from a gas outlet 110, which has achieved efficient operation.
  • the reference numeral 111 denotes a water drum
  • 112 denotes a steam drum
  • 113 and 114 denote headers
  • 115 denotes a wall tube.
  • US 3956898 A discloses a reheat boiler with the features of the preamble portion of claim 1.
  • JP 61-101233 A discloses a combustion treatment apparatus including a burner, a reacting furnace, and a heat exchanger.
  • One or two baffle plates provided with plural openings is/are mounted into the reaction furnace so as to cross the cross section of the furnace for uniformizing a gas flow speed and to allow the reaction to easily advance.
  • JP 51-089236 A and JP 51-148862 A disclose measures for promoting the mixing of gases with different temperature including measures to introduce a swirl or directional change in only one of the respective gas flows.
  • the reheat burner 107 is installed only at the front wall of the reheat furnace 108, not at the rear wall of the reheat furnace 108.
  • the difference in temperature of the combustion gas between the front wall (X in FIG. 6 ) side and the rear wall (Y in FIG. 6 ) side of the reheat furnace 108 is sometimes several hundred degrees.
  • This significant imbalance in the temperature of the combustion gas is a problem.
  • Such an imbalance in temperature of the combustion gas is considered to be due to incomplete mixing of the combustion gas and the reheat combustion gas because of a temperature difference between the combustion gas flowing from the main boiler 106 and the reheat combustion gas from the reheat burner 107.
  • the imbalance in temperature of the combustion gas at the outlet of the reheat furnace 108 (at the inlet of the reheater 109), i.e., the imbalance in the temperature distribution of the mixed combustion gas composed of the combustion gas and the reheat combustion gas, is undesirable because it may decrease the heat-transfer performance of the reheat furnace 108 and the reheater 109 and may lead to high-temperature corrosion of a reheat tube of the reheater 109 and a decrease in strength of a support member.
  • the present invention has been made in view of the above-described problem, and an object thereof is to provide a reheat boiler in which the imbalance in the temperature distribution of the combustion gas at the outlet of the reheat furnace is reduced by changing the flow pattern of the gas in the reheat furnace.
  • the present invention provides a reheat boiler with the features of claim 1.
  • the drift preventing portion that narrows the cross-sectional area of the flow path for the combustion gas is provided at a reheat furnace outlet connecting the reheat furnace and the reheater and forming the flow path for the mixed combustion gas (the combustion gas and the reheat combustion gas). This allows the flow of the main combustion gas and the reheat combustion gas passing through the drift preventing portion to cause turbulence, facilitating mixing.
  • the drift preventing portion is formed by attaching a closing plate to the outlet of the reheat furnace. This configuration enables the opening ratio of the cross-sectional area of the flow path to be easily adjusted by appropriately changing the size of the closing plate.
  • the closing plate in this case is divided into a plurality of segments such that the segments can be independently attached or removed. This configuration enables the opening ratio of the cross-sectional area of the flow path to be easily adjusted at the installation site by changing the number of closing plate members attached or removed.
  • the drift preventing portion that narrows the cross-sectional area of the flow path is provided at the outlet of the reheat furnace forming the flow path for the mixed combustion gas (the combustion gas and the reheat combustion gas), it is possible to allow the flow of the main combustion gas and the reheat combustion gas passing through the drift preventing portion to cause turbulence. Because this turbulence of the reheat combustion gas facilitates mixing of the combustion gas and the reheat combustion gas having different temperatures, it is possible to provide a reheat boiler in which the imbalance is reduced such that the temperature distribution of the mixed combustion gas is uniform at the outlet of the reheat furnace (at the inlet of the reheater) on the downstream side of the drift preventing portion.
  • the flow pattern of the combustion gas and the reheat combustion gas can be changed by allowing the combustion gas and the reheat combustion gas to pass through the drift preventing portion, the two combustion gases having different temperatures are mixed on the downstream side of the drift preventing portion and flow in the reheater with a substantially uniform temperature distribution.
  • a reheat boiler according to an embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 3 .
  • a reheat boiler 10A is configured such that the combustion gas generated by combustion in a burner 101 flows through a main boiler 106 in which the gas from a furnace 102 passes through a superheater 104 and evaporator tubes 105, a reheat furnace 108 in which the combustion gas is reheated in a reheat burner 107, and a reheater 109 through which the reheated combustion gas passes.
  • the combustion gas generated by combustion in the burner 101 flows from the furnace 102 and passes through the front tube bank 103, the superheater 104, and the evaporator tubes 105 in the main boiler 106. Then, the combustion gas flowing into the reheat furnace 108 from the main boiler 106 flows in the reheater 109 together with the reheat combustion gas generated in the reheat burner 107.
  • the gas composed of the mixture of the combustion gas flowing from the main boiler 106 and the reheat combustion gas generated in the reheat furnace 108 i.e., the gas flowing through the reheat furnace 108 and on the downstream thereof, is generally referred to as the "mixed combustion gas".
  • the mixed combustion gas which is the combustion gas flowing from the main boiler 106 merged with the reheat combustion gas generated in the reheat furnace 108, passes through a reheat furnace outlet (which is also the inlet of the reheater 109) 120 connecting the reheat furnace 108 and the reheater 109 and forming a flow path.
  • the reheat furnace outlet 120 is provided with a closing plate 130 to form a drift preventing portion that narrows the cross-sectional area of the flow path for the mixed combustion gas.
  • This closing plate 130 narrows and drastically changes the cross-sectional area of the flow path at the reheat furnace outlet 120, where the combustion gas flow flowing from the main boiler 106 and making a substantially 90-degree upward turn is merged with the reheat combustion gas flow rising from the lower side of the reheat furnace 108 and where the mixed combustion gas is directed from the reheat furnace 108 to the reheater 109. That is, the closing plate 130 installed in a high-temperature area where the high-temperature mixed combustion gas flows serves to narrow the cross-sectional area of the flow path for the mixed combustion gas at the reheat furnace outlet 120 to temporarily and drastically reduce the cross-sectional area of the flow path.
  • FIGS. 2A to 2C Installation examples of the closing plate 130 that narrows the cross-sectional area of the flow path are shown in FIGS. 2A to 2C .
  • the closing plates 130 are attached on the front and rear sides (on the front wall side and the rear wall side), or on the left and right sides (on the left wall side and the right wall side), of the reheat furnace outlet 120 to partially close the flow path and drastically reduce the cross-sectional area of the flow path.
  • the closing plate 130 is attached either on the front side or the rear side (on the front wall side or the rear wall side), or on the left side or the right side (on the left wall side or the right wall side), of the reheat furnace outlet 120 to partially close the flow path and drastically reduce the cross-sectional area of the flow path.
  • this closing plate 130 drastically reduces the cross-sectional area of the flow path at the reheat furnace outlet 120 connecting the reheat furnace 108 and the reheater 109 and forming the flow path for the mixed combustion gas (the combustion gas and the reheat combustion gas), allowing the flow of the main combustion gas and the reheat combustion gas passing through the closing plate 130 to cause turbulence, such as swirl, such that they are stirred. That is, the flow of the combustion gas having made a substantially 90-degree upward turn and the flow of the reheat combustion gas rising upward collide with the closing plate 130, and a decrease in the cross-sectional area of the flow path changes the flow direction and increases the flow rate, making the flow pattern in the reheat furnace 108 complex. Thus, stirring and mixing of the combustion gas in the reheat furnace 108 is facilitated.
  • FIG. 3 is a graph showing the relationship between the opening ratio and the gas temperature ratio when the closing plate 130 is installed at the cross-sectional area of the reheat furnace outlet 120.
  • the opening ratio on the horizontal axis represents the proportion of the area of the opening where the cross-sectional area of the flow path of the reheat furnace outlet 120 remains unclosed by the closing plate 130. The larger the value is, the greater the area of the opening serving as the flow path for the mixed combustion gas.
  • the gas temperature ratio on the vertical axis represents the ratio of the maximum gas temperature (Tmax) to the average gas temperature (Tav). The closer the value is to 1, the more uniform the temperature is. That is, as the gas temperature ratio increases, the difference between the maximum gas temperature and the average gas temperature of the mixed combustion gas increases, resulting in a greater temperature imbalance.
  • the opening ratio of the reheat furnace outlet 120 should be appropriately adjusted by changing the size of the closing plate 130 (the area of the flow path blocked) such that the maximum operating efficiency is achieved, taking into consideration the temperature imbalance and pressure loss of the mixed combustion gas.
  • the opening ratio of the cross-sectional area of the flow path can be easily adjusted by changing the size of the closing plate 130.
  • the above-described closing plate 130 should have a structure such that it is installed on stack tubes 140 extending through the reheat furnace outlet 120, like, for example, a closing plate 130A according to a modification of the above-described embodiment, shown in FIG. 4 .
  • the stack 140 is composed of evaporator tubes (stack) 141 crossing above the reheat furnace 108.
  • a new support member does not need to be provided in the high-temperature area where the mixed combustion gas flows.
  • the support member mounted in the high-temperature area needs to be made of a material capable of withstanding a high-temperature environment.
  • the closing plate 130A shown in FIG. 4 is divided into a plurality of segments to enable the cross-sectional area of the flow path to be adjusted.
  • a pair of closing plates 130A on the left and right sides are each divided into three segments. That is, one closing plate 130A is divided into three, namely, closing plate members 131, 132, and 133, enabling the closing plate members 131, 132, and 133 to be independently attached or removed.
  • This configuration enables the opening ratio of the cross-sectional area of the flow path to be easily adjusted at the installation site by changing the number of closing plate members attached or removed. That is, the number of closing plate members 131, 132, and 133 to be installed can be easily adjusted by attaching or removing them to achieve the appropriate opening ratio on the basis of the result of a combustion test conducted on the reheat boiler 10A at the installation site (the temperature imbalance level, etc.). Note that the number of segments into which the closing plate 130A is divided is not limited to three as described above.
  • the closing plate 130A shown constitutes an inclined surface such that the area of the opening gradually increases toward the outlet. Therefore, the mixed combustion gas with a uniform temperature distribution is smoothly distributed in the reheater 109 and passes substantially uniformly through the entire interior of the reheater 109. Thus, the heat exchange efficiency in the reheater 109 is improved. Note that an improvement in the heat exchange efficiency in the reheater 109 is also effective in improving the efficiency of the reheat boiler 10A.
  • the closing plate 130 that narrows the cross-sectional area of the flow path is attached to the reheat furnace outlet 120 constituting the flow path for the mixed combustion gas (the combustion gas and the reheat combustion gas) to form the drift preventing portion, the flow of the mixed combustion gas passing through the drift preventing portion causes turbulence, facilitating mixing.
  • the temperature imbalance is reduced so that the temperature distribution is uniform at the outlet of the reheat furnace 108 (the inlet of the reheater 109) on the downstream side of the drift preventing portion.
  • the flow pattern of the combustion gas and the reheat combustion gas, serving as the mixed combustion gas can be changed by allowing the mixed combustion gas to pass through the drift preventing portion where the cross-sectional area of the flow path is narrowed by attaching the closing plate 130, the two combustion gases having different temperatures are mixed on the downstream side of the drift preventing portion and flow in the reheater 109 with a substantially uniform temperature distribution.
  • the imbalance in temperature of the mixed combustion gas at the inlet of the reheater 109 is eliminated, and it is possible to provide the reheat boiler 10A having a high efficiency in which a decrease in heat-transfer performance of the reheat furnace 108 and the reheater 109 is prevented or suppressed..

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Combustion Of Fluid Fuel (AREA)

Claims (3)

  1. Chaudière (10A) de réchauffe, comprenant :
    une chaudière (16) principale, configurée de manière à ce que des gaz de combustion principaux, produits par combustion dans un brûleur (101), puissent passer d'un four (102) dans un surchauffeur (104) et dans des tubes (105) d'évaporateur;
    un four (108) de réchauffe, qui est monté en amont des tubes (105) d'évaporateur et qui est configuré pour produire des gaz de combustion de réchauffe par combustion dans un brûleur (107) de réchauffe et
    un réchauffeur (109) disposé au dessus du four (108) de réchauffe,
    caractérisée en ce que la chaudière (10a) de réchauffe comprend en outre
    une partie empêchant une dérive, qui rend plus étroite la surface de section transversale d'un trajet d'écoulement des gaz de combustion prévue à une sortie (120) du four de réchauffe, reliant le four (108) de réchauffe et le réchauffeur (109) et formant le trajet de passage des gaz de combustion et des gaz de combustion de réchauffe,
    dans laquelle la partie empêchant une dérive est formée fixant une plaque (130; 130A) de fermeture à la sortie (120) du four (108) de réchauffe et
    dans laquelle la plaque (130; 130A) de fermeture est fixée : à un côté de paroi avant et/ou à un côté de paroi arrière de la sortie (120) du réchauffeur ou à un côté de paroi gauche et/ou à un côté de paroi droit de la sortie (120) du réchauffeur.
  2. Chaudière (10A) de réchauffe suivant la revendication 1, dans laquelle la plaque (130A) de fermeture est subdivisée en une pluralité de segments (131, 132, 133), de manière à pouvoir fixer ou retirer les segments (131, 132, 133) indépendamment.
  3. Chaudière (10A) de réchauffe suivant la revendication 1 ou 2, dans laquelle la plaque (130; 130A) de fermeture est montée sur des tubes (140) d'empilement passant dans la sortie (120) du four de réchauffe.
EP09814438.9A 2008-09-17 2009-08-26 Chaudière de réchauffe Active EP2325560B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008237711A JP5148426B2 (ja) 2008-09-17 2008-09-17 再熱ボイラ
PCT/JP2009/064880 WO2010032593A1 (fr) 2008-09-17 2009-08-26 Chaudière de réchauffe

Publications (3)

Publication Number Publication Date
EP2325560A1 EP2325560A1 (fr) 2011-05-25
EP2325560A4 EP2325560A4 (fr) 2016-10-26
EP2325560B1 true EP2325560B1 (fr) 2018-06-20

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ID=42039431

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09814438.9A Active EP2325560B1 (fr) 2008-09-17 2009-08-26 Chaudière de réchauffe

Country Status (6)

Country Link
US (1) US20110139092A1 (fr)
EP (1) EP2325560B1 (fr)
JP (1) JP5148426B2 (fr)
KR (1) KR101280130B1 (fr)
CN (1) CN102132095B (fr)
WO (1) WO2010032593A1 (fr)

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JP5010425B2 (ja) * 2007-10-17 2012-08-29 三菱重工業株式会社 再熱ボイラ及び再熱ボイラのガス温度制御方法
CN103742209A (zh) * 2013-08-21 2014-04-23 王强 可演化分级热焓加热锅炉技术
CN103776020B (zh) * 2014-02-26 2015-06-17 章礼道 尾部三烟道双挡板加射流烟气再循环二次再热电站锅炉
KR102681525B1 (ko) 2023-04-21 2024-07-04 에이에스티 주식회사 열효율 개선 및 증발관 점검 기능을 갖는 수관식 보일러

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Also Published As

Publication number Publication date
CN102132095A (zh) 2011-07-20
KR101280130B1 (ko) 2013-06-28
CN102132095B (zh) 2013-11-06
JP2010071513A (ja) 2010-04-02
WO2010032593A1 (fr) 2010-03-25
EP2325560A1 (fr) 2011-05-25
EP2325560A4 (fr) 2016-10-26
US20110139092A1 (en) 2011-06-16
JP5148426B2 (ja) 2013-02-20
KR20110043710A (ko) 2011-04-27

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