JP5787154B2 - Waste heat recovery boiler - Google Patents

Waste heat recovery boiler Download PDF

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JP5787154B2
JP5787154B2 JP2011196510A JP2011196510A JP5787154B2 JP 5787154 B2 JP5787154 B2 JP 5787154B2 JP 2011196510 A JP2011196510 A JP 2011196510A JP 2011196510 A JP2011196510 A JP 2011196510A JP 5787154 B2 JP5787154 B2 JP 5787154B2
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heat transfer
transfer tube
panels
vibration
tube panels
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JP2013057463A (en
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清 相田
清 相田
譲 吉元
譲 吉元
宏昭 細井
宏昭 細井
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Mitsubishi Power Ltd
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Mitsubishi Hitachi Power Systems Ltd
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Description

本発明は、排熱回収ボイラ（ＨＲＳＧ）に関し、特にガスタービンからの高温高速の排ガスの流れにより励振される排熱回収ボイラの伝熱管パネルの防振構造に関する。   The present invention relates to an exhaust heat recovery boiler (HRSG), and more particularly to a vibration isolation structure of a heat transfer tube panel of an exhaust heat recovery boiler excited by a flow of high-temperature and high-speed exhaust gas from a gas turbine.

急増する電力需要に応えるために、高効率発電の一環として、最近複合発電プラントが注目されている。この複合発電プラントはまず、ガスタービンによる発電を行うとともに、ガスタービンから排出される排ガス中の熱を排熱回収装置（排熱回収ボイラ）によって回収し、この排熱回収ボイラで発生した蒸気により、蒸気タービンを駆動させて発電するものである。   Recently, combined power plants have attracted attention as part of high-efficiency power generation in order to meet the rapidly increasing power demand. This combined power plant first generates power by a gas turbine, recovers heat in exhaust gas discharged from the gas turbine by an exhaust heat recovery device (exhaust heat recovery boiler), and uses steam generated in the exhaust heat recovery boiler. The steam turbine is driven to generate electricity.

この複合発電プラントは、ガスタービンによる発電と蒸気タービンによる発電を同時に行うことができるために、発電効率が高い上にガスタービンは負荷応答性に優れており、急激な電力需要の上昇、下降にも充分対応し得る負荷追従性に優れた利点もあり、特にいわゆる毎日起動停止（Daily Start Stop）運転や、週末起動停止（Weekly Start Stop）運転を行うプラントには有効である。   Since this combined power plant can perform power generation using a gas turbine and power generation using a steam turbine at the same time, the power generation efficiency is high and the gas turbine has excellent load responsiveness. There is also an advantage of excellent load followability that can be sufficiently handled, and it is particularly effective for a plant that performs a so-called daily start / stop operation or a weekend start / stop operation.

ところが、この複合発電プラントにおいては、ＬＮＧ、灯油などのクリーンな燃料を使用するので、ＳＯｘ量やダスト量は少なくなるが、ガスタービンの燃焼においては酸素量が多く、高温燃焼を行うために、排ガス中のＮＯｘ量が増加するので、脱硝装置を内蔵した排熱回収ボイラが用いられている。   However, in this combined power plant, since clean fuel such as LNG and kerosene is used, the amount of SOx and the amount of dust are reduced, but in the combustion of the gas turbine, the amount of oxygen is large and high temperature combustion is performed. Since the amount of NOx in the exhaust gas increases, an exhaust heat recovery boiler with a built-in denitration device is used.

図１１には脱硝装置が配置された複合発電プラントの概略系統図を示す。図１１において、ガスタービン１からの高温高速の排ガス１１は排熱回収ボイラ（ＨＲＳＧ）ダクト１２に設置された過熱器３、第１の蒸発器４、脱硝装置５、第２の蒸発器６、節炭器７に順次に接触して熱交換される。また第１の蒸発器４と第２の蒸発器６からの蒸気を含む水が管路２８ａと管路２８ｂから汽水分離ドラム８にそれぞれ送られ、該汽水分離ドラム８から分離された蒸気は飽和蒸気管３７を経て過熱器３でさらに過熱された後、主蒸気管３１を経由して蒸気タービン９を駆動する過熱蒸気として利用される。蒸気タービン９で用いられた蒸気は復水器１０で水Ｗに戻され、給水管路３２に配置された復水ポンプ３０により節炭器７に循環され、節炭器７でガスタービン１からの排ガス１１より予熱されてドラム８内に供給される。ドラム８内の水は降水管３３を通って下降し、管路３５ａ、３５ｂを経て蒸発器４、６へ導入され、その後、管路２８ａ、２８ｂを経てドラム８内に戻る。主蒸気管３１に接続されたタービンバイパス管３８は、蒸気タービン９をバイパスして蒸気を直接復水器１０に導いても良い。   FIG. 11 shows a schematic system diagram of a combined power plant in which a denitration device is arranged. In FIG. 11, high-temperature and high-speed exhaust gas 11 from the gas turbine 1 includes a superheater 3, a first evaporator 4, a denitration device 5, a second evaporator 6, installed in an exhaust heat recovery boiler (HRSG) duct 12. Heat is exchanged by sequentially contacting the economizer 7. Further, water containing the steam from the first evaporator 4 and the second evaporator 6 is sent to the brackish water separation drum 8 from the pipes 28a and 28b, respectively, and the steam separated from the brackish water separation drum 8 is saturated. After being further heated by the superheater 3 via the steam pipe 37, it is used as superheated steam for driving the steam turbine 9 via the main steam pipe 31. The steam used in the steam turbine 9 is returned to the water W by the condenser 10, and circulated to the economizer 7 by the condensate pump 30 disposed in the feed water pipe 32, and from the gas turbine 1 by the economizer 7. The exhaust gas 11 is preheated and supplied into the drum 8. The water in the drum 8 descends through the downpipe 33 and is introduced into the evaporators 4 and 6 through the pipes 35a and 35b, and then returns to the drum 8 through the pipes 28a and 28b. The turbine bypass pipe 38 connected to the main steam pipe 31 may bypass the steam turbine 9 and guide the steam directly to the condenser 10.

また、図１１には、蒸気タービン９への蒸気の流量を調節する蒸気タービン加減弁３９、蒸気タービン９への蒸気の供給により蒸気のバイパス量を調節するタービンバイパス弁４０および排ガスダクト１２のダンパ４１が設けられている。   Further, FIG. 11 shows a steam turbine control valve 39 for adjusting the flow rate of steam to the steam turbine 9, a turbine bypass valve 40 for adjusting the amount of steam bypass by supplying steam to the steam turbine 9, and a damper for the exhaust gas duct 12. 41 is provided.

以上の説明は、複合発電プラントにおける高温高速の排ガス１１、給水Ｗ及び蒸気の各流れの概要を説明したものであるが、一般に、排熱回収ボイラ（ＨＲＳＧ）内には、過熱器３、蒸発器４、６及び節炭器７等の熱交換器が組み込まれて、排ガス１１の排熱を回収するとともに排ガス１１の脱硝を行うために脱硝装置５が配置されている。   Although the above description has explained the outline of each flow of the high-temperature and high-speed exhaust gas 11, feed water W, and steam in the combined power plant, generally, in the exhaust heat recovery boiler (HRSG), the superheater 3, the evaporation Heat exchangers such as the units 4 and 6 and the economizer 7 are incorporated, and a denitration device 5 is arranged to recover exhaust heat of the exhaust gas 11 and denitrate the exhaust gas 11.

図１２には排熱回収ボイラ（ＨＲＳＧ）内に配置される熱交換器を構成する伝熱管パネル１３の斜視図を示している。該伝熱管パネル１３は、前記図１１の過熱器３、第１の蒸発器４、第２の蒸発器６及び節炭器７等の伝熱面を構成する熱交換器であり、上部、下部管寄せ１７、１７とそれらの間に多数の伝熱管２２を接続し、伝熱管２２の外周には排ガス１１からの熱を吸収し易くしたフィン２３が螺旋状に巻き付けられ、溶接接続されたフィンチューブ２４からなる。このような伝熱管パネル１３が図１２に示す例では、パネル面をガス流れに直交する方向に向けて３つ伝熱管パネル１３を一ユニットとして、このユニットを複数並べて配置し、これらをガス流れに直交するボイラ左右方向の水平サポート１９とガス流れ方向に沿った連結金具１８と水平サポート端部補強板２０（図１２には図示せず。図１９に示すように水平サポート端部補強板２０は１つの伝熱管パネル１３の並列位置にある２つの水平サポート１９間を連結し、２つの隣接伝熱管パネル１３の補強板２０同士を連結する）で束ねている。   In FIG. 12, the perspective view of the heat exchanger tube panel 13 which comprises the heat exchanger arrange | positioned in an exhaust heat recovery boiler (HRSG) is shown. The heat transfer tube panel 13 is a heat exchanger that constitutes a heat transfer surface such as the superheater 3, the first evaporator 4, the second evaporator 6 and the economizer 7 of FIG. The headers 17, 17 and a large number of heat transfer tubes 22 are connected between them, and fins 23 that are easy to absorb heat from the exhaust gas 11 are spirally wound around the outer periphery of the heat transfer tubes 22, and are connected by welding. It consists of a tube 24. In the example in which such a heat transfer tube panel 13 is shown in FIG. 12, three heat transfer tube panels 13 are arranged as a unit with the panel surface facing in a direction orthogonal to the gas flow, and a plurality of these units are arranged side by side. The horizontal support 19 in the left-right direction of the boiler orthogonal to the horizontal direction, the connecting metal fitting 18 along the gas flow direction, and the horizontal support end reinforcing plate 20 (not shown in FIG. 12. As shown in FIG. 19, the horizontal support end reinforcing plate 20 Are connected together by connecting two horizontal supports 19 in a parallel position of one heat transfer tube panel 13 and connecting reinforcing plates 20 of two adjacent heat transfer tube panels 13).

３列の伝熱管２２を千鳥配置する伝熱管パネル１３の横断面図を図１３に示し、図１４に図１３の伝熱管パネルの側面図と、図１５に図１３の伝熱管パネル１３の上下に管寄せを接続する前の状態の側面図を示している。   FIG. 13 shows a cross-sectional view of the heat transfer tube panel 13 in which the three rows of heat transfer tubes 22 are arranged in a staggered manner. FIG. 14 is a side view of the heat transfer tube panel of FIG. The side view of the state before connecting a header is shown.

これら図１３、図１４及び図１５の断面図、側面図及び組み立て前の側面図に示す構成からなるフィンチューブ２４（伝熱管２２とフィン２３からなる）をハニカムサポート２９（図１３）で束ね、さらにハニカムサポート２９の外側を連結金具１８、水平サポート１９及び補強板２０（図１７〜図２０参照）で束ねて一伝熱管パネル１３として用いる例である。ここでは、各伝熱管パネル１３は伝熱管２２とその回りに螺旋状に溶接されるフィン２３からなるフィンチューブ２４を備え、このフィンチューブ２４を２列また３列千鳥配置した例を示している。   The fin tubes 24 (consisting of the heat transfer tubes 22 and the fins 23) having the configurations shown in the cross-sectional views, side views, and side views before assembly in FIGS. 13, 14 and 15 are bundled with the honeycomb support 29 (FIG. 13). Further, in this example, the outside of the honeycomb support 29 is bundled with the connecting metal fitting 18, the horizontal support 19, and the reinforcing plate 20 (see FIGS. 17 to 20) and used as the one heat transfer tube panel 13. Here, each heat transfer tube panel 13 includes a heat transfer tube 22 and a fin tube 24 composed of fins 23 spirally welded around the heat transfer tube 22, and an example in which the fin tubes 24 are arranged in two or three rows in a staggered manner is shown. .

３列のフィンチューブ２４を一伝熱管パネルユニットとして製造する場合には、上部、下部管寄せ１７、１７の間に図１３に示すようにフィンチューブ２４の上下にそれぞれ波板からなるハニカムサポート２９の互いに接触する部分の要所を溶接接続して溶接部Ｙとする。   When three rows of fin tubes 24 are manufactured as a single heat transfer tube panel unit, a honeycomb support 29 made of corrugated plates is provided above and below the fin tubes 24 between the upper and lower headers 17 and 17 as shown in FIG. The points of the parts that are in contact with each other are welded to form a welded portion Y.

図１６にＨＲＳＧの鳥瞰図を示す。ＨＲＳＧは、ダクト１２の内部に伝熱管パネル１３を収納した蒸気発生器である。ダクト１２の内部には、ガスタービン(図示せず)からの高温高速の排ガス１１が流入され、伝熱管パネル１３で熱吸収されて比較的低温になったガスが煙突１４から排出される。   FIG. 16 shows a bird's-eye view of HRSG. The HRSG is a steam generator in which the heat transfer tube panel 13 is housed in the duct 12. High-temperature and high-speed exhaust gas 11 from a gas turbine (not shown) flows into the duct 12, and the gas that has been absorbed by the heat transfer tube panel 13 and has a relatively low temperature is discharged from the chimney 14.

図１７にＨＲＳＧの排ガス入口部の側面図を示す。また図１８には図１７のＡ−Ａ線断面図を示し、図１９には図１７のＢ−Ｂ線断面図を示し、例えば伝熱管パネル１３Ａは排ガス１１の流れガスに直交する方向に左、中央、右と３列並列配置された例を示しており、伝熱管パネル１３ＡＬ、伝熱管パネル１３ＡＭ、伝熱管パネル１３ＡＲからなる。なお、伝熱管パネル１３Ａ、１３Ｂ、１３Ｃをガスタービンからの排ガス１１の流れ方向に沿って順次配置する。   FIG. 17 shows a side view of the exhaust gas inlet of HRSG. 18 shows a cross-sectional view taken along the line AA in FIG. 17, and FIG. 19 shows a cross-sectional view taken along the line BB in FIG. 17. For example, the heat transfer tube panel 13A is left in the direction perpendicular to the flow gas of the exhaust gas 11. , An example in which three rows are arranged in parallel with the center and the right, and includes a heat transfer tube panel 13AL, a heat transfer tube panel 13AM, and a heat transfer tube panel 13AR. The heat transfer tube panels 13A, 13B, and 13C are sequentially arranged along the flow direction of the exhaust gas 11 from the gas turbine.

また各伝熱管パネル１３ＡＬ、伝熱管パネル１３ＡＭ、伝熱管パネル１３ＡＲはダクト１２の前後方向の連結金具１８とダクト１２の横断方向に水平サポート１９がそれぞれ複数段配置されている。連結金具１８は水平サポート１９の端部に設けられている。   Each heat transfer tube panel 13AL, heat transfer tube panel 13AM, and heat transfer tube panel 13AR are provided with a plurality of stages of connecting brackets 18 in the front-rear direction of the duct 12 and horizontal supports 19 in the transverse direction of the duct 12. The connecting fitting 18 is provided at the end of the horizontal support 19.

また各伝熱管パネル１３ＡＬ、伝熱管パネル１３ＡＭ、伝熱管パネル１３ＡＲは上部管寄せ１７ＡＬ、１７ＡＭ、１７ＡＲにそれぞれ吊下げ支持され、また伝熱管パネル１３ＡＬ、伝熱管パネル１３ＡＭ、伝熱管パネル１３ＡＲは下部管寄せ１７ＡＬ、１７ＡＭ、１７ＡＲにそれぞれ接続している。また、ダクト１２は架構１６を介して地面１５に支持されている。   Further, each heat transfer tube panel 13AL, heat transfer tube panel 13AM, and heat transfer tube panel 13AR are suspended and supported by upper headers 17AL, 17AM, and 17AR, respectively, and heat transfer tube panel 13AL, heat transfer tube panel 13AM, and heat transfer tube panel 13AR are lower tubes. They are connected to the 17AL, 17AM, and 17AR, respectively. The duct 12 is supported on the ground 15 via a frame 16.

伝熱管パネル１３Ａ、１３Ｂ、１３Ｃには、約６５０℃で約２０ｍ／ｓの高温高流速ガス１１が作用して振動する。この振動を抑制するため、従来、伝熱管パネル１３Ａ、１３Ｂ、１３Ｃをガスタービンからの排ガス（ガス流れ）１１の流れる方向に沿った（前後）方向に連結する金具１８を設置していた(特開２０００−２９１９０１号公報参照)。この連結金具１８による伝熱管パネル１３Ａ、１３Ｂ、１３Ｃの前後方向の連結状態を、図１７とは異なる方向から表示したものを、図１８（図１７のＡ−Ａ線断面図）及び図１９（図１７のＢ−Ｂ線断面図）に示す。   The heat transfer tube panels 13A, 13B, and 13C are vibrated by the high temperature and high flow velocity gas 11 of about 20 m / s acting at about 650 ° C. In order to suppress this vibration, conventionally, a metal fitting 18 that connects the heat transfer tube panels 13A, 13B, 13C in the (front-rear) direction along the flow direction of the exhaust gas (gas flow) 11 from the gas turbine has been installed. No. 2000-291901). The connection state in the front-rear direction of the heat transfer tube panels 13A, 13B, and 13C by the connection fitting 18 is shown from a direction different from that in FIG. It is shown in the BB line sectional view of FIG.

図１９に示すように、水平サポート１９の端部には補強板２０が設置されており、この補強板２０にピン２１を介して連結金具１８が設置されている。図１９に示す伝熱管パネル１３ＡＬ、１３ＡＭ、１３ＡＲに、ガスタービン１からの約６５０℃で約２０ｍ／ｓの高温高流速ガス１１が作用した場合の伝熱管パネル１３ＡＬ、１３ＡＭ、１３ＡＲの変形状態を図２０に示す。   As shown in FIG. 19, a reinforcing plate 20 is installed at the end of the horizontal support 19, and a connecting metal fitting 18 is installed on the reinforcing plate 20 via a pin 21. The deformation state of the heat transfer tube panels 13AL, 13AM, 13AR when the high temperature high flow rate gas 11 of about 20 m / s from the gas turbine 1 acts on the heat transfer tube panels 13AL, 13AM, 13AR shown in FIG. It shows in FIG.

排ガス１１の流れは、均等流ではなく旋回流であり、これが各伝熱管パネル１３ＡＬ、１３ＡＭ、１３ＡＲの間隙である圧力損失の小さい部分に流れ込むことが振動のトリガとなり、排ガス１１の流れに対して左右方向に連結されていない伝熱管パネル１３ＡＬ、１３ＡＭ、１３ＡＲの振動が除々に大きくなる。また、この振動により、連結金具１８の変形が大きくなり、連結金具１８の損傷や破断につながるとともに、伝熱管パネル１３ＡＬ、１３ＡＭ、１３ＡＲ同士が接触して（図２０に点線サークルＳで示す）により伝熱管パネル１３ＡＬ、１３ＡＭ、１３ＡＲに損傷が生じることが問題であった。   The flow of the exhaust gas 11 is not a uniform flow but a swirl flow. The flow of the exhaust gas 11 flows into a portion of the heat transfer tube panels 13AL, 13AM, and 13AR where the pressure loss is small. The vibrations of the heat transfer tube panels 13AL, 13AM, and 13AR that are not connected in the left-right direction gradually increase. Moreover, the deformation of the connection fitting 18 is increased by this vibration, leading to damage or breakage of the connection fitting 18 and the heat transfer tube panels 13AL, 13AM, 13AR coming into contact with each other (indicated by a dotted circle S in FIG. 20). It was a problem that the heat transfer tube panels 13AL, 13AM, and 13AR were damaged.

このような従来の問題点を解決すべく、ＨＲＳＧ内での排ガス１１の流れに対して左右方向にも連結金具１８を設けることが考えられるが、単純に前記左右方向を連結する金具１８を設けるだけでは、全伝熱管パネル１３ＡＬ、１３ＡＭ、１３ＡＲ；１３ＢＬ、１３ＢＭ、１３ＢＲ；１３ＣＬ、１３ＣＭ、１３ＣＲの安定した振動モードを形成できず、連結金具１８による十分な振動吸収ができないことが問題であった。   In order to solve such a conventional problem, it is conceivable to provide the connecting fitting 18 in the left-right direction with respect to the flow of the exhaust gas 11 in the HRSG. However, the fitting 18 simply connecting the left-right direction is provided. Alone, the stable vibration modes of all the heat transfer tube panels 13AL, 13AM, 13AR; 13BL, 13BM, 13BR; 13CL, 13CM, 13CR cannot be formed, and sufficient vibration absorption by the connecting bracket 18 is a problem. .

また、本出願人が先に出願した発明（特許文献１）では排ガス１１の流れの前後方向に配置される一対の伝熱管パネル同士を連結金具で連結することで、伝熱管パネル群の剛性を高めることを開示している。   Moreover, in the invention (patent document 1) filed earlier by the present applicant, the rigidity of the heat transfer tube panel group is increased by connecting a pair of heat transfer tube panels arranged in the front-rear direction of the flow of the exhaust gas 11 with a connecting metal fitting. It is disclosed to enhance.

特開２０００−２９１９０１号公報JP 2000-291901 A

近年、ガスタービンが大型化して、ＨＲＳＧ に流入する排ガスは、従来の約２０ｍ／ｓの流速に比べて遥かに高速流である約５０ｍ／sで、しかも約６５０℃という高温ガスとなっている。そのため、ＨＲＳＧ内で高速高温の排ガス１１に偏流が生じると、１００ｍ／ｓにもなる高速ガス流が部分的に発生する場合がある。   In recent years, gas turbines have become larger, and the exhaust gas flowing into HRSG has a high-speed gas of about 650 ° C. at about 50 m / s, which is a much higher flow rate than the conventional flow rate of about 20 m / s. . Therefore, when a drift occurs in the high-speed and high-temperature exhaust gas 11 in the HRSG, a high-speed gas flow as high as 100 m / s may be partially generated.

そのため、上記したように図１８、図１９記載の伝熱管パネル構成では、前記約６５０℃で約５０ｍ／ｓ以上、局所的には約１００ｍ／ｓの高温高速流のガスタービン排ガス１１が旋回流となって作用した場合に図２０に示すように伝熱管パネルの振動を抑制することができないことがあり、また、特許文献１記載の方法では剛性が高くなっても高温高速の排ガス流による変形防止を達成させることはできない。   Therefore, as described above, in the heat transfer tube panel configuration shown in FIGS. 18 and 19, the gas turbine exhaust gas 11 having a high-temperature high-speed flow of about 50 m / s or more at about 650 ° C. and locally about 100 m / s is swirling. 20 may not be able to suppress the vibration of the heat transfer tube panel as shown in FIG. 20, and the method described in Patent Document 1 may be deformed by a high-temperature and high-speed exhaust gas flow even if the rigidity is increased. Prevention cannot be achieved.

本発明の課題は、上記従来技術における問題点を解決し、約６５０℃で約５０ｍ／ｓ以上、場合によっては約１００ｍ／ｓの高温高流速のガスタービン排ガスの旋回流によって励起される伝熱管パネルの振動を抑制を図りながらＨＲＳＧの安定運用を可能とする排熱回収ボイラを提供することにある。   An object of the present invention is to solve the above-mentioned problems in the prior art, and a heat transfer tube excited by a swirling flow of a gas turbine exhaust gas having a high temperature and a high flow rate of about 50 m / s or more at about 650 ° C. An object of the present invention is to provide an exhaust heat recovery boiler that enables stable operation of HRSG while suppressing vibration of the panel.

本発明は以下の請求項に記載した発明により達成される。
請求項１記載の発明は、ガスタービン排ガスが旋回流となって流入するダクト内でのガス流れに直交する方向に２列以上並列配置され、ガス流れに沿って２列以上配置され、複数個の伝熱管を束ねた伝熱管パネルと、前記ダクト内でのガス流れに沿って２列以上配置された伝熱管パネルの隣接する伝熱管パネル同士を連結する第１の連結部材で連結し、またガス流れに直交する方向に２列以上配置された伝熱管パネルの隣接する伝熱管パネル同士を連結する第２の連結部材で連結し、前記第２の連結部材は、隣接する２つの伝熱管パネル同士の相対変位に応じて変位自由度を変化させた構成からなることを特徴とする排熱回収ボイラである。 The present invention is achieved by the invention described in the following claims.
According to the first aspect of the present invention, two or more rows are arranged in parallel in a direction orthogonal to the gas flow in the duct into which the gas turbine exhaust gas flows as a swirling flow, and two or more rows are arranged along the gas flow. A heat transfer tube panel in which the heat transfer tubes are bundled, and a first connection member that connects adjacent heat transfer tube panels of two or more rows arranged along the gas flow in the duct; and Two or more heat transfer tube panels arranged in two or more rows in a direction orthogonal to the gas flow are connected by a second connection member that connects adjacent heat transfer tube panels, and the second connection member includes two adjacent heat transfer tube panels. An exhaust heat recovery boiler having a configuration in which a degree of freedom of displacement is changed according to relative displacement between each other.

請求項２記載の発明は、前記第２の連結部材が、隣接する２つの伝熱管パネル同士の相対変位が他の隣接する２つの伝熱管パネル同士の相対変位より大きくなる部位は変位自由度のある２以上のピン止め体で第２の連結部材が構成され、隣接する２つの伝熱管パネル同士の相対変位が他の隣接する２つの伝熱管パネル同士の相対変位より小さくなる部位は変位自由度のある１つのピン止め体で第２の連結部材が構成されることを特徴とする請求項１記載の排熱回収ボイラである。   According to a second aspect of the present invention, the portion where the second connecting member has a relative displacement between two adjacent heat transfer tube panels larger than the relative displacement between the other two adjacent heat transfer tube panels has a degree of freedom of displacement. A portion where the second connecting member is constituted by two or more pinned bodies and the relative displacement between the two adjacent heat transfer tube panels is smaller than the relative displacement between the other two adjacent heat transfer tube panels is the degree of freedom of displacement. 2. The exhaust heat recovery boiler according to claim 1, wherein the second connecting member is configured by a single pinned body.

請求項３記載の発明は、前記ピン止め体が、隣接する２つの伝熱管パネルにそれぞれ支持固定された係止板と前記各係止板に設けられたそれぞれの丸孔より小径である、前記丸孔に挿着して２つの伝熱管パネルを係止するピンからなることを特徴とする請求項２記載の排熱回収ボイラである。   According to a third aspect of the present invention, the pinning body is smaller in diameter than the locking plate supported and fixed to two adjacent heat transfer tube panels and the respective round holes provided in the locking plates. The exhaust heat recovery boiler according to claim 2, comprising a pin that is inserted into the round hole and engages the two heat transfer tube panels.

請求項１記載の発明によれば、例えば約６５０℃で約５０ｍ／ｓ以上、局所的には約１００ｍ／ｓの高温高速流のガスタービン排ガスの旋回流によって伝熱管パネルが振動を励起されようとする場合に、前記第２の連結部材は、隣接する２つの伝熱管パネル同士の相対変位に応じて変位自由度を変化させた構成であるので、全伝熱管パネルの安定した振動モードを形成して十分な振動エネルギー吸収効果を得ることができる。   According to the first aspect of the present invention, the heat transfer tube panel is excited to vibrate by the swirling flow of the gas turbine exhaust gas having a high temperature and a high speed flow of, for example, about 50 m / s or more at about 650 ° C., locally about 100 m / s. In this case, since the second connecting member has a configuration in which the degree of freedom of displacement is changed according to the relative displacement between two adjacent heat transfer tube panels, a stable vibration mode of all the heat transfer tube panels is formed. Thus, a sufficient vibration energy absorption effect can be obtained.

請求項２記載の発明によれば、請求項１記載の発明の効果に加えて、ガス流れに直交する方向に配置される隣接する２つの伝熱管パネル同士の相対変位が他の隣接する２つの伝熱管パネル同士の相対変位より大きくなる部位には変位自由度のある２以上のピン止め体で第２の連結部材が構成され、またガス流れに直交する方向に配置される隣接する２つの伝熱管パネル同士の相対変位が他の隣接する２つの伝熱管パネル同士の相対変位より小さくなる部位には変位自由度のある１つのピン止め体で第２の連結部材が構成されることで、確実に全伝熱管パネルの安定した振動モードを形成して十分な振動エネルギー吸収効果を得ることができ、確実にＨＲＳＧの防振が達成できる。   According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the relative displacement between two adjacent heat transfer tube panels arranged in a direction orthogonal to the gas flow is different from the other two adjacent ones. A second connecting member is constituted by two or more pinning bodies having a degree of freedom of freedom at a portion larger than the relative displacement between the heat transfer tube panels, and two adjacent transmissions arranged in a direction orthogonal to the gas flow. Since the second connecting member is constituted by a single pinned body having a degree of freedom of freedom at a portion where the relative displacement between the two heat transfer tube panels is smaller than the relative displacement between the two adjacent heat transfer tube panels, it is ensured. In addition, a stable vibration mode of the entire heat transfer tube panel can be formed to obtain a sufficient vibration energy absorption effect, and the vibration isolation of the HRSG can be reliably achieved.

請求項３記載の発明によれば、請求項２記載の発明の効果に加えて、ガス流れに直交する方向に隣接する２つの伝熱管パネルを連結する第２の連結部材としてピン止めという簡単な構成を用いることができるので、安価にＨＲＳＧの防振を達成することができる。   According to the invention described in claim 3, in addition to the effect of the invention described in claim 2, as a second connecting member for connecting two heat transfer tube panels adjacent to each other in a direction orthogonal to the gas flow, pinning is simple. Since the configuration can be used, vibration isolation of HRSG can be achieved at low cost.

本発明の実施例のＨＲＳＧパネル防振構造における図１７のＢ−Ｂ線断面図である。It is the BB sectional view taken on the line of FIG. 17 in the HRSG panel vibration isolating structure of the Example of this invention. 図１のＨＲＳＧの伝熱管パネルの連結用のピンの形状とパネル間の左右方向の相対変形時に荷重Ｐとその反力（Ｐ／２）のピンへの発生部位を説明する図である。It is a figure explaining the generation | occurrence | production site | part to the pin of the shape of the pin for connection of the heat transfer tube panel of HRSG of FIG. 1, and the load P and its reaction force (P / 2) at the time of the relative deformation of the horizontal direction between panels. 図１のＨＲＳＧの伝熱管パネルの連結用ピンの変位δと荷重Ｐとの関係を示すグラフである。2 is a graph showing a relationship between a displacement δ of a connecting pin of the HRSG heat transfer tube panel of FIG. 図１のＨＲＳＧの中央部の伝熱管パネルに設置した１本のピンを有する左右方向連結金具の詳細を示す平面図である。It is a top view which shows the detail of the left-right direction coupling metal fitting which has one pin installed in the heat exchanger tube panel of the center part of HRSG of FIG. 図１のＨＲＳＧの中央部の伝熱管パネルに設置した１本のピンを有する左右方向連結金具の詳細を示す側面図である。It is a side view which shows the detail of the left-right direction coupling metal fitting which has one pin installed in the heat exchanger tube panel of the center part of HRSG of FIG. 図１のＨＲＳＧの前側の伝熱管パネルと後側の伝熱管パネルの各縁部分に設置した２本のピンを有する左右方向連結金具の詳細を示す平面図である。It is a top view which shows the detail of the left-right direction coupling metal fitting which has two pins installed in each edge part of the heat exchanger tube panel of the front side of HRSG of FIG. 1, and a rear heat exchanger tube panel. 図１のＨＲＳＧの前側の伝熱管パネルと後側の伝熱管パネルの各縁部分に設置した２本のピンを有する左右方向連結金具の詳細を示す側面図である。It is a side view which shows the detail of the left-right direction coupling metal fitting which has two pins installed in each edge part of the front heat exchanger tube panel of HRSG of FIG. 1, and a rear heat exchanger tube panel. ガスタービン排ガスの旋回流が、本実施例による防振構造に作用した場合の伝熱管パネルの振動モードを示す図１７のＢ−Ｂ線断面図である。FIG. 18 is a cross-sectional view taken along the line BB of FIG. 17 showing a vibration mode of the heat transfer tube panel when the swirling flow of the gas turbine exhaust gas acts on the vibration isolation structure according to the present embodiment. ガスタービン排ガスの旋回流が、本実施例による防振構造に作用した場合の伝熱管パネルのもう１つの振動モードを示す図１７のＢ−Ｂ線断面図である。It is the BB sectional drawing of FIG. 17 which shows another vibration mode of the heat exchanger tube panel at the time of the swirling flow of gas turbine exhaust gas acting on the vibration isolating structure by a present Example. 従来の構造と本実施例による防振構造での伝熱管パネルの振動レベルを比較した結果を示すグラフである。It is a graph which shows the result of having compared the vibration level of the heat exchanger tube panel in the conventional structure and the vibration proof structure by a present Example. 脱硝装置が配置された複合発電プラントの概略系統図であるIt is a schematic system diagram of a combined power plant in which a denitration device is arranged 排熱回収ボイラ（ＨＲＳＧ）内に配置される熱交換器を構成する伝熱管パネルの斜視図である。It is a perspective view of the heat exchanger tube panel which comprises the heat exchanger arrange | positioned in a waste heat recovery boiler (HRSG). 排熱回収ボイラ内に配置される伝熱管パネルの断面図である。It is sectional drawing of the heat exchanger tube panel arrange | positioned in an exhaust heat recovery boiler. 図１３の伝熱管パネルの側面図である。It is a side view of the heat exchanger tube panel of FIG. 図１３の伝熱管パネルの組み立て前の側面図である。It is a side view before the assembly of the heat exchanger tube panel of FIG. ＨＲＳＧの鳥瞰図である。It is a bird's-eye view of HRSG. ＨＲＳＧの入口部分の側面図である。It is a side view of the entrance part of HRSG. 図１７のＡ−Ａ線断面図である。It is the sectional view on the AA line of FIG. 図１７のＢ−Ｂ線断面図である。It is the BB sectional view taken on the line of FIG. 従来のＨＲＳＧの伝熱管パネルの振動を抑制することができない場合の伝熱管パネルの排ガス流による変形状態を説明する図１７のＢ−Ｂ線断面図である。FIG. 18 is a cross-sectional view taken along line B-B in FIG. 17 for explaining a deformation state of the heat transfer tube panel due to the exhaust gas flow when vibration of the conventional HRSG heat transfer tube panel cannot be suppressed.

本発明の実施例を図面と共に説明する。
図１には本発明の実施例のＨＲＳＧパネル防振構造における図１７のＢ−Ｂ線断面図を示す。本実施例では排ガス流れ方向に３列、排ガス流れに直交する方向に３列の伝熱管パネル（以下単にパネルということがある）１３が配置しているものとして説明する。しかし実際は排ガス流れ方向には３列以上、排ガス流れに直交する方向にも３列以上の伝熱管パネル１３が配置されているものもある。 Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view taken along line B-B of FIG. 17 in the HRSG panel vibration-proof structure of the embodiment of the present invention. In the present embodiment, it is assumed that three rows of heat transfer tube panels (hereinafter sometimes simply referred to as panels) 13 are arranged in the direction of the exhaust gas flow and three rows in the direction orthogonal to the exhaust gas flow. However, in reality, there are some in which three or more rows of heat transfer tube panels 13 are arranged in the exhaust gas flow direction and three or more rows in the direction orthogonal to the exhaust gas flow.

また、図１において、排ガスの入口側（缶前）の伝熱管パネル１３Ａ、中央部の伝熱管パネル１３Ｂ、出口側（缶後）の伝熱管パネル１３Ｃとし、各伝熱管パネル１３Ａ〜１３Ｃのうちで缶前から見て左側のものを伝熱管パネル１３ＡＬ、１３ＢＬ、１３ＣＬ、中央のものを伝熱管パネル１３ＡＭ、１３ＢＭ、１３ＣＭ、そして右側を伝熱管パネル１３ＡＲ、１３ＢＲ、１３ＣＲということにする。   Moreover, in FIG. 1, it is set as the heat exchanger tube panel 13A of the inlet side (before a can) of exhaust gas, the heat exchanger tube panel 13B of a center part, and the heat exchanger tube panel 13C of an outlet side (after a can), Of each heat exchanger tube panel 13A-13C As seen from the front of the can, the left one is the heat transfer tube panels 13AL, 13BL, 13CL, the central one is the heat transfer tube panels 13AM, 13BM, 13CM, and the right is the heat transfer tube panels 13AR, 13BR, 13CR.

図１に示す全伝熱管パネル１３ＡＬ、１３ＡＭ、１３ＡＲ；１３ＢＬ、１３ＢＭ、１３ＢＲ；１３ＣＬ、１３ＣＭ、１３ＣＲ（以下全パネルということがある。）の縁部分の伝熱管パネル１３ＣＬと伝熱管パネル１３ＣＲが伝熱管パネル１３ＣＭと接合をする連結金具５３Ａ、５３Ｂに２本のピン２５を設置し、全パネルの中央部分に１本のピン２６を有する左右方向連結金具５２Ａ、５２Ｂ、５２Ｃを設置することで、全パネルの安定した振動モードを形成して十分な振動エネルギー吸収効果を得ることを可能にする防振構造である。
ここで、排ガス１１が作用しない時点(パネル変形前の時点)でのパネル間のギャップδｂとする。 The heat transfer tube panel 13CL and the heat transfer tube panel 13CR at the edge of all the heat transfer tube panels 13AL, 13AM, 13AR; 13BL, 13BM, 13BR; 13CL, 13CM, 13CR (hereinafter also referred to as all panels) shown in FIG. By installing two pins 25 on the connecting fittings 53A and 53B to be joined to the heat tube panel 13CM, and installing left and right connecting fittings 52A, 52B and 52C having one pin 26 at the center of all the panels, The anti-vibration structure makes it possible to obtain a sufficient vibration energy absorption effect by forming a stable vibration mode of the entire panel.
Here, the gap δb between the panels when the exhaust gas 11 does not act (before the panel deformation).

本構造では、振動時に生じるパネル間の左右方向の相対変位を利用してエネルギー吸収部材である鋼製ピン２５、２６により振動エネルギーを吸収する。このピン２５、２６の詳細を、図２、図３を用いて説明する。   In this structure, vibration energy is absorbed by the steel pins 25 and 26 that are energy absorbing members using the relative displacement in the left-right direction between the panels that occurs during vibration. Details of the pins 25 and 26 will be described with reference to FIGS.

図２は、ピン２５、２６の形状を示したものである。直径Ｄで長さＬのピン２５、２６の長さ方向の中央部にパネル間の左右方向の相対変形時に荷重Ｐが発生する。また、荷重Ｐの反力（Ｐ／２）がピン２５、２６の両端部に発生する。図３は、横軸をピン２５、２６の変位δ、縦軸を荷重Ｐとするグラフであり、変位δと荷重Ｐによる平行四辺形内の面積Ａ分のエネルギー吸収が行われる。   FIG. 2 shows the shapes of the pins 25 and 26. A load P is generated at the center in the length direction of the pins 25 and 26 having a diameter D and a length L at the time of relative deformation between the panels in the left-right direction. Further, a reaction force (P / 2) of the load P is generated at both ends of the pins 25 and 26. FIG. 3 is a graph in which the horizontal axis represents the displacement δ of the pins 25 and 26 and the vertical axis represents the load P, and energy absorption corresponding to the area A in the parallelogram by the displacement δ and the load P is performed.

図１における全パネルの中央部のパネル１３Ｂに設置した１本のピン２６を有する左右方向連結金具５２Ａ、５２Ｂ、５２Ｃの詳細を図４及び図５に示す。図４は平面図であり、図５は側面図である。これらの図に示すように、伝熱管パネル１３ＢＬ、１３ＢＭ、１３ＢＲに設けた左右のパネルを束ねる水平サポート１９と水平サポート端部補強板２０の中で、水平サポート端部補強板２０にピン支持板固定板５２Ｄを取り付け、伝熱管パネル１３ＢＬ、１３ＢＲのピン支持板固定板５２Ｄにそれぞれ並列状に配置して支持された一対のピン支持板５２Ａ、５２Ａ又は５２Ｃ、５２Ｃを設け、伝熱管パネル１３ＢＭのピン支持板固定板５２Ｄにはピン支持板５２Ｂを設け、各ピン支持板５２Ａ、５２Ｂ、５２Ｃにはそれぞれ丸孔（図示せず）を設けておく。そして並列配置された一対のピン支持板５２Ａ、５２Ａ又は５２Ｃ、５２Ｃの間にピン支持板５２Ｂをそれぞれ差し込み、互いの丸孔同士を重ね合わせて、これに振動吸収部材であるピン２６は差し込む。   4 and 5 show the details of the left and right connecting fittings 52A, 52B, and 52C having one pin 26 installed on the panel 13B at the center of all the panels in FIG. 4 is a plan view and FIG. 5 is a side view. As shown in these drawings, among the horizontal support 19 and the horizontal support end reinforcing plate 20 for bundling the left and right panels provided on the heat transfer tube panels 13BL, 13BM, 13BR, the horizontal support end reinforcing plate 20 has a pin support plate. A fixed plate 52D is attached, and a pair of pin support plates 52A, 52A or 52C, 52C are arranged and supported in parallel on the pin support plate fixed plate 52D of the heat transfer tube panels 13BL, 13BR, respectively. The pin support plate fixing plate 52D is provided with a pin support plate 52B, and each pin support plate 52A, 52B, 52C is provided with a round hole (not shown). Then, the pin support plates 52B are respectively inserted between the pair of pin support plates 52A, 52A or 52C, 52C arranged in parallel, the circular holes are overlapped with each other, and the pins 26 that are vibration absorbing members are inserted therein.

図１におけるＨＲＳＧ前側の伝熱管パネル１３ＡとＨＲＳＧ後側の伝熱管パネル１３Ｃの各縁部分に設置した２本のピン２５を有する左右方向連結金具５３Ａ、５３Ｂの詳細を、図６及び図７に示す。図６は平面図であり、図７は側面図である。これらの図に示すように、左側に図示するパネル１３ＡＬ、１３ＡＭ；１３ＣＬ、１３ＣＭと右側に図示するパネル１３ＡＭ、１３ＡＲ；１３ＣＭ、１３ＣＲとをそれぞれ束ねる水平サポート１９と水平サポート端部補強板２０の中で、相対向する水平サポート端部補強板２０、２０にそれぞれピン支持板固定板５３Ｄ、５３Ｄを設け、これらピン支持板固定板５３Ｄ、５３Ｄに丸孔（図示せず）を設け、該ピン支持板固定板５３Ｄ、５３Ｄを挟むように設けた２枚の並列位置に配置したピン支持板５３Ａ、５３Ａ又は５３Ｂ、５３Ｂにもそれぞれ２つの丸孔を設け、前記ピン支持板固定板５３Ｄと２枚のピン支持板５３Ａ、５３Ａ又は５３Ｂ、５３Ｂの丸孔同士を重ね合わせてピン２５を差し込む。各ピン支持板５３Ａ、５３Ｂにはそれぞれ２つの丸孔があるので、それぞれにピン２５を差し込む。なお、ピン支持板５３Ａ、５３Ｂはピン２５を中心に回動自在である。ピン支持板５２Ａ、５２Ｂ、５２Ｃはピン２６を中心に回動自在である。
なお、図４、図６で水平サポート１９と水平サポート端部補強板２０の内部には伝熱管２２とフィン２３を束ねたハニカムサポート２９ａ、２９ｂと、該ハニカムサポート２９ａ、２９ｂの端部と水平サポート１９と水平サポート端部補強板２０で囲まれた空間部には充填部材４３が配置されている。 FIG. 6 and FIG. 7 show the details of the left and right connecting fittings 53A and 53B having two pins 25 installed at the respective edge portions of the heat transfer tube panel 13A on the HRSG front side and the heat transfer tube panel 13C on the rear side of the HRSG in FIG. Show. 6 is a plan view and FIG. 7 is a side view. As shown in these figures, in the horizontal support 19 and the horizontal support end reinforcing plate 20 for binding the panels 13AL, 13AM; 13CL, 13CM shown on the left side and the panels 13AM, 13AR; 13CM, 13CR shown on the right side, respectively. The horizontal support end reinforcing plates 20 and 20 facing each other are provided with pin support plate fixing plates 53D and 53D, respectively, and the pin support plate fixing plates 53D and 53D are provided with round holes (not shown) to support the pins. The pin support plates 53A, 53A or 53B, 53B arranged at two parallel positions so as to sandwich the plate fixing plates 53D, 53D are also provided with two round holes, respectively, and the two pin support plate fixing plates 53D. The pin support plates 53A, 53A or 53B, 53B are overlapped with each other and the pin 25 is inserted. Since each pin support plate 53A, 53B has two round holes, the pin 25 is inserted into each of them. The pin support plates 53A and 53B are rotatable around the pin 25. The pin support plates 52A, 52B, and 52C are rotatable about the pin 26.
4 and 6, the horizontal support 19 and the horizontal support end reinforcing plate 20 have honeycomb supports 29a and 29b in which heat transfer tubes 22 and fins 23 are bundled, and the end portions of the honeycomb supports 29a and 29b. A filling member 43 is disposed in the space surrounded by the support 19 and the horizontal support end reinforcing plate 20.

ただし、フィン２４を持たない伝熱管２２群を伝熱管パネル１３として用いる場合はハニカムサポート２９がない構成とすることもできる。   However, when the heat transfer tube 22 group having no fins 24 is used as the heat transfer tube panel 13, the honeycomb support 29 can be omitted.

このような構造とすることで、ＨＲＳＧを流れる排ガス１の旋回流による振動時に生じるパネル間の左右方向（排ガス流れに直交する方向）の相対変位を利用したエネルギー吸収が可能となる。   By adopting such a structure, it is possible to absorb energy using a relative displacement in the left-right direction (direction orthogonal to the exhaust gas flow) between the panels that is generated when the exhaust gas 1 flowing through the HRSG vibrates due to the swirling flow.

本発明による防振構造の効果を、以下に説明する。
図８は、約６５０℃、約５０ｍ／ｓのガスタービンからの排ガス１１の旋回流が、本実施例による防振構造に作用した場合の振動モードを示す。この振動モードは、全パネル(図中の９個のパネル１３ＡＬ、１３ＡＭ、１３ＡＲ；１３ＢＬ、１３ＢＭ、１３ＢＲ；１３ＣＬ、１３ＣＭ、１３ＣＲ)における、ＨＲＳＧ後側のパネル１３ＣＬ、１３ＣＭ、１３ＣＲ間のギャップδａ１が振動前のギャップδbより大きく、ＨＲＳＧ前側のパネル１３ＡＬ、１３ＡＭ、１３ＡＲ間のギャップδａ３が振動前のギャップδｂより小さく、中央部分のパネル１３ＢＬ、１３ＢＭ、１３ＢＲのパネルのギャップδａ２が振動前のギャップδｂにほぼ等しくなる形状、つまり１次モードで変形する形状である。 The effect of the vibration isolating structure according to the present invention will be described below.
FIG. 8 shows a vibration mode when the swirling flow of the exhaust gas 11 from the gas turbine at about 650 ° C. and about 50 m / s acts on the vibration isolating structure according to this embodiment. In this vibration mode, the gap δa1 between the panels 13CL, 13CM, 13CR on the rear side of the HRSG in all panels (9 panels 13AL, 13AM, 13AR; 13BL, 13BM, 13BR; 13CL, 13CM, 13CR in the figure) The gap δa3 between the panels 13AL, 13AM, and 13AR on the front side of the HRSG is smaller than the gap δb before the vibration, and the gap δa2 of the panels of the panels 13BL, 13BM, and 13BR in the center portion is the gap δb before the vibration. Is a shape deformed in the first-order mode.

上述のように、ＨＲＳＧ後側のパネル１３ＣＬ、１３ＣＭ、１３ＣＲ間のギャップδａ１は振動前のギャップδｂより大きいため相対変位が生じており、この部分で大きい振動エネルギー吸収が期待できるため、このエネルギー吸収量に対応した２本のピン２５が設置されている。同様に、ＨＲＳＧ前側のパネル１３ＡＬ、１３ＡＭ、１３ＡＲ間のギャップδａ３は振動前のギャップδｂより小さいため相対変位が生じており、この部分におけるこのエネルギー吸収量に対応した２本のピン２５が設置されている。   As described above, since the gap δa1 between the panels 13CL, 13CM, and 13CR on the rear side of the HRSG is larger than the gap δb before the vibration, a relative displacement occurs, and a large vibration energy absorption can be expected in this portion. Two pins 25 corresponding to the amount are installed. Similarly, since the gap δa3 between the panels 13AL, 13AM, and 13AR on the front side of the HRSG is smaller than the gap δb before vibration, relative displacement occurs, and two pins 25 corresponding to this energy absorption amount in this portion are installed. ing.

これに対し、中央部分のパネル１３ＢＬ、１３ＢＭ、１３ＢＲのパネルのギャップδａ２は振動前のギャップδｂにほぼしく、相対変位がほとんど生じず、この部分で大きい振動エネルギー吸収が期待できないため１本のピン２６が設置されている。   On the other hand, the gap δa2 of the panels 13BL, 13BM, and 13BR in the central portion is almost the same as the gap δb before vibration, so that relative displacement hardly occurs, and a large vibration energy absorption cannot be expected in this portion. 26 is installed.

図９は、本発明による防振構造のもう一つの振動モードを示す。このモードでは、ＨＲＳＧ後側のパネル１３ＣＬ、１３ＣＭ間のギャップδｃ１が振動前のギャップδｂより大きく、ＨＲＳＧ前側のパネル１３ＡＭ、１３ＡＲ間のギャップδｃ１も振動前のギャップδｂより大きい。一方、ＨＲＳＧ後側のパネル１３ＣＭ、１３ＣＲ間のギャップδｃ３が振動前のギャップδｂより小さく、下縁側のパネル１３ＡＬ、１３ＡＭ間のギャップδｃ３も振動前のギャップδｂより小さい。   FIG. 9 shows another vibration mode of the vibration-proof structure according to the present invention. In this mode, the gap δc1 between the HRSG rear panels 13CL and 13CM is larger than the gap δb before vibration, and the gap δc1 between the HRSG front panels 13AM and 13AR is also larger than the gap δb before vibration. On the other hand, the gap δc3 between the panels 13CM and 13CR on the rear side of the HRSG is smaller than the gap δb before vibration, and the gap δc3 between the panels 13AL and 13AM on the lower edge side is also smaller than the gap δb before vibration.

これに対し、中央部分のパネル１３ＢＬ、１３ＢＭ、１３ＢＲのパネルのギャップδｃ２が振動前のギャップδｂにほぼ等しくなる。つまりこの振動モード形状は、２次モードで変形する形状である。   On the other hand, the gap δc2 of the panels 13BL, 13BM, 13BR in the central portion is substantially equal to the gap δb before vibration. That is, this vibration mode shape is a shape that deforms in the secondary mode.

本モード(２次モード)におけるパネル間の相対変位が大きい場所は、上述した一次モードの場合と同じであり、相対変位が大きくなる部分に２本のピン２５が設置され、相対変位が小さい部分に１本のピン２６が設置されている。   The place where the relative displacement between the panels in this mode (secondary mode) is large is the same as in the case of the primary mode described above, and the two pins 25 are installed in the portion where the relative displacement is large, and the portion where the relative displacement is small. A single pin 26 is provided on each.

図１０に、従来の防振構造と本実施例による構造での、パネルの振動レベルを比較した結果を示す。本図の横軸は運転時間、縦軸は振動レベルを示し、振動レベルは所期の振動変位を１とした時の無次元化した振動変位を表す。   FIG. 10 shows the result of comparing the vibration level of the panel between the conventional vibration-proof structure and the structure according to this example. In this figure, the horizontal axis represents the operating time, the vertical axis represents the vibration level, and the vibration level represents the dimensionless vibration displacement when the desired vibration displacement is 1.

点線で示す従来構造のパネルの振動レベルは、ガスタービンからの排ガスの旋回流によって、個々のパネルが振動するため、運転時間に対して２次曲線的に振動レベルが増加していた。これに対し、実線で示す本実施例の防振構造では、運転時間に対して、直線的に振動レベルが増加するものの、その増加の勾配は、従来構造に比べて極めて小さくなる。   The vibration level of the panel having the conventional structure indicated by the dotted line is increased in a quadratic curve with respect to the operation time because each panel vibrates due to the swirling flow of the exhaust gas from the gas turbine. On the other hand, in the vibration isolating structure of the present embodiment shown by the solid line, the vibration level increases linearly with respect to the operation time, but the gradient of the increase is extremely small compared to the conventional structure.

本発明は、今後、タービンの大型化等による排ガス偏流が増加することが予想されるため、本発明による伝熱管パネルの防振構造は、今後のＨＲＳＧにも利用される可能性が高い。   Since the present invention is expected to increase exhaust gas drift due to an increase in the size of the turbine and the like in the future, the vibration isolation structure for the heat transfer tube panel according to the present invention is likely to be used for future HRSG.

１ ガスタービン ３ 過熱器
４ 第１の蒸発器 ５ 脱硝装置
６ 第２の蒸発器 ７ 節炭器
８ 汽水分離ドラム ９ 蒸気タービン
１０ 復水器 １１ 排ガス
１２ ＨＲＳＧダクト
１３Ａ ガス流れ前側の伝熱管パネル
１３Ｂ ガス流れ中央部の伝熱管パネル
１３Ｃ ガス流れ後側伝熱管パネル
１３ＡＬ、１３ＢＬ、１３ＣＬ 左側の伝熱管パネル
１３ＡＭ、１３ＢＭ、１３ＣＭ 中央の伝熱管パネル
１３ＡＲ、１３ＢＲ、１３ＣＲ 右側の伝熱管パネル
１４ 煙突 １５ 地面
１６ 架構
１７Ａ、１７Ｂ、１７Ｃ 上部、下部管寄せ
１８ 連結金具 １９ 水平サポート
２０ 水平サポート端部補強板
２１ ピン ２２ 伝熱管
２３ フィン ２４ フィンチューブ
２５、２６ ピン ２８ａ、２８ｂ 管路
２９ ハニカムサポート ３０ 復水ポンプ
３１ 主蒸気管 ３２ 給水管路
３３ 降水管 ３５ａ、３５ｂ 管路
３７ 飽和蒸気管
３８ タービンバイパス管 ３９ 蒸気タービン加減弁
４０ タービンバイパス弁 ４１ ダンパ
４３ 充填部材
５２Ａ、５２Ｂ、５２Ｃ ピン支持板
５２Ｄ ピン支持板固定板 ５３Ａ、５３Ｂ ピン支持板
５３Ｄ ピン支持板固定板 Ｐ 荷重
δ 変位 DESCRIPTION OF SYMBOLS 1 Gas turbine 3 Superheater 4 1st evaporator 5 Denitration device 6 2nd evaporator 7 Carbon-saving device 8 Brackish water separation drum 9 Steam turbine 10 Condenser 11 Exhaust gas 12 HRSG duct 13A Heat transfer tube panel 13B before gas flow Heat transfer tube panel 13C, 13BL, 13CL Left heat transfer tube panel 13AM, 13BM, 13CM Right heat transfer tube panel 13AR, 13BR, 13CR Right heat transfer tube panel 14 Chimney 15 Ground 16 Frame 17A, 17B, 17C Upper and lower headers 18 Connecting bracket 19 Horizontal support 20 Horizontal support end reinforcing plate 21 Pin 22 Heat transfer tube 23 Fin 24 Fin tube 25, 26 Pin 28a, 28b Pipe 29 Honeycomb support 30 Condensate Pump 31 Main steam pipe 32 Water supply line 33 Precipitation pipe 35a, 35b Pipe line 37 Saturated steam pipe 38 Turbine bypass pipe 39 Steam turbine control valve
40 Turbine bypass valve 41 Damper 43 Filling member 52A, 52B, 52C Pin support plate 52D Pin support plate fixing plate 53A, 53B Pin support plate 53D Pin support plate fixing plate P Load δ Displacement

Claims (3)

ガスタービン排ガスが旋回流となって流入するダクト内でのガス流れに直交する方向に２列以上並列配置され、ガス流れに沿って２列以上配置され、複数個の伝熱管を束ねた伝熱管パネルと、
前記ダクト内でのガス流れに沿って２列以上配置された伝熱管パネルの隣接する伝熱管パネル同士を連結する第１の連結部材で連結し、またガス流れに直交する方向に２列以上配置された伝熱管パネルの隣接する伝熱管パネル同士を連結する第２の連結部材で連結し、
前記第２の連結部材は、隣接する２つの伝熱管パネル同士の相対変位に応じて変位自由度を変化させた構成からなることを特徴とする排熱回収ボイラ。 Two or more rows are arranged in parallel in a direction orthogonal to the gas flow in the duct into which the gas turbine exhaust gas flows as a swirl flow, and two or more rows are arranged along the gas flow, and a plurality of heat transfer tubes are bundled together. A panel,
Two or more rows of heat transfer tube panels arranged along the gas flow in the duct are connected by a first connecting member that connects adjacent heat transfer tube panels, and two or more rows are arranged in a direction perpendicular to the gas flow. Connected by a second connecting member that connects adjacent heat transfer tube panels to each other,
The exhaust heat recovery boiler, wherein the second connecting member has a configuration in which a degree of freedom of displacement is changed in accordance with a relative displacement between two adjacent heat transfer tube panels. 前記第２の連結部材は、隣接する２つの伝熱管パネル同士の相対変位が他の隣接する２つの伝熱管パネル同士の相対変位より大きくなる部位は変位自由度のある２以上のピン止め体で構成され、隣接する２つの伝熱管パネル同士の相対変位が他の隣接する２つの伝熱管パネル同士の相対変位より小さくなる部位は変位自由度のある１つのピン止め体で構成されることを特徴とする請求項１記載の排熱回収ボイラ。   In the second connecting member, the portion where the relative displacement between two adjacent heat transfer tube panels is larger than the relative displacement between the other two adjacent heat transfer tube panels is two or more pinned bodies having a degree of freedom of displacement. The region where the relative displacement between the two adjacent heat transfer tube panels is smaller than the relative displacement between the other two adjacent heat transfer tube panels is constituted by one pinned body having a degree of freedom of displacement. The exhaust heat recovery boiler according to claim 1. 前記ピン止め体は、隣接する２つの伝熱管パネルにそれぞれ支持固定された係止板と前記各係止板に設けられたそれぞれの丸孔より小径である前記丸孔に挿着して２つの伝熱管パネルを係止するピンからなることを特徴とする請求項２記載の排熱回収ボイラ。   The pinned body is inserted into two round holes each having a smaller diameter than a locking plate supported and fixed by two adjacent heat transfer tube panels and each round hole provided in each locking plate. The exhaust heat recovery boiler according to claim 2, comprising a pin for locking the heat transfer tube panel.
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