JPH06193803A - Support structure of intra-bed tube in fluidized bed boiler - Google Patents

Abstract

PURPOSE:To furnish a support structure of an intra-bed tube in a fluidized bed boiler which can cope with thermal expansion of the intra-bed tube and is free from the possibility of collision of intra-bed tubes with each other and of the intra-bed tube with the main body of the boiler even when a horizontal force acts on the intra-bed tube in the case of an earthquake or the like. CONSTITUTION:A boiler main body 1 having a fluidized bed B inside and contained in a pressure vessel 4, a plurality of support tubes 18 hung down from above in the boiler main body, and a plurality of intra-bed tubes 20 fitted to the support tubes, are provided. The intra-bed tubes 20 have a construction wherein a plurality of horizontal tubes disposed vertically with a space therebetween are connected at the opposite ends alternately, and are disposed within the same vertical plane substantially as the support tubes. Moreover, the end parts of the horizontal tubes of the intra-bed tubes 20 on the side adjacent to the boiler main body are connected with the boiler main body through the intermediary of horizontal connecting members 25 having horizontal pins 24 in the opposite ends.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は流動層ボイラにおける層
内管の支持構造に係わり、更に詳しくは、六角形加圧流
動層ボイラにおける層内管の支持構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure for an inner layer tube in a fluidized bed boiler, and more particularly to a support structure for an inner layer tube in a hexagonal pressure fluidized bed boiler.

【０００２】[0002]

【従来の技術】加圧下で石炭を流動燃焼させる加圧流動
層ボイラ（Pressurised Fluidized Bed Combuster)は、
ガスタービンと組み合わせたコンバインドサイクルによ
り４０％以上の熱効率を有し、炉内脱硫率が高く、ＮＯ
x の発生量が少ない、等の特徴を有することから、従来
の微粉焚ボイラに代わる新型ボイラとして現在開発が進
められている。かかる加圧流動層ボイラは、例えば図９
に示すように、ボイラ本体１、サイクロン２、ベッド材
貯蔵容器３、等が圧力容器４内に格納された構成のもの
であり、外部から供給さた石炭Ｃをボイラ本体１内で燃
焼させ、その排ガスはサイクロン２に送られ、サイクロ
ン２で灰が除去された排ガスが外部のガスタービン（図
示せず）に供給され仕事（例えば発電機の駆動）をする
ようになっている。また、ボイラ本体１内には、石炭
灰、砂等のベッド材が下方から供給される空気Ａにより
流動した流動層Ｂが形成されており、この流動層Ｂ内に
は、水蒸気を発生させるための蒸発器５、過熱器６、及
び再熱器７が挿入されている。流動層Ｂ内で石炭の燃焼
により発生した熱により、蒸発器５内で水が蒸発して水
蒸気となり、過熱器６内で水蒸気が更に加熱されて過熱
蒸気となり、この過熱蒸気は外部に設けられた蒸気ター
ビン（図示せず）で膨張し仕事をする。更に、蒸気ター
ビンで温度が下がった蒸気は、再熱器７で再度加熱され
て過熱蒸気となり、外部の蒸気タービンで再び仕事をす
るようになっている。2. Description of the Related Art A pressurized fluidized bed combuster for fluidized combustion of coal under pressure is
The combined cycle combined with a gas turbine has a thermal efficiency of 40% or more, a high in-furnace desulfurization rate, and NO
Since it has features such as a small amount of x generation, it is currently under development as a new boiler replacing the conventional fine powder boiler. Such a pressurized fluidized bed boiler is shown in FIG.
As shown in, the boiler main body 1, the cyclone 2, the bed material storage container 3, etc. are configured to be stored in the pressure container 4, and the coal C supplied from the outside is burned in the boiler main body 1, The exhaust gas is sent to the cyclone 2, and the exhaust gas from which ash has been removed by the cyclone 2 is supplied to an external gas turbine (not shown) for work (for example, driving a generator). Further, in the boiler body 1, a fluidized bed B in which bed material such as coal ash or sand is fluidized by the air A supplied from below is formed. In the fluidized bed B, steam is generated. The evaporator 5, the superheater 6, and the reheater 7 are inserted. Due to the heat generated by the combustion of coal in the fluidized bed B, water is evaporated in the evaporator 5 to become steam, and the steam is further heated in the superheater 6 to become superheated steam, which is provided outside. The steam turbine (not shown) expands and does work. Further, the steam whose temperature has dropped in the steam turbine is reheated in the reheater 7 to become superheated steam, and the work is performed again in the external steam turbine.

【０００３】[0003]

【発明が解決しようとする課題】かかる加圧流動層ボイ
ラにおいて、石炭の燃焼により流動層Ｂの内部は、例え
ば８００℃以上の高温となり、ボイラ本体１と、蒸発器
５、過熱器６、及び再熱器７等の流動層内に配置された
伝熱管（以下、層内管という）とがそれぞれ熱膨張す
る。従って、熱応力の発生を防ぐためには層内管をボイ
ラ本体に直接固定することはできず、従来は、ボイラ本
体の上方から支持管（図示せず）を吊るし、この支持管
にそれぞれの層内管を取り付けていた。しかし、かかる
層内管の支持構造では、例えば地震等の場合に層内管に
水平力が作用すると、層内管が流動層内で水平に大きく
移動し、ボイラ本体の壁に衝突し、ボイラ本体や層内管
を損傷させるおそれがあった。更に、近年、かかる加圧
流動層ボイラの大容量化が要望されているが、大容量の
加圧流動層ボイラでは、多数の層内管を密に流動層内に
配置する必要があり、従来の層内管の支持構造では、地
震等による水平力により、層内管が互いに衝突して層内
管を損傷させるおそれがあった。In such a pressurized fluidized bed boiler, the inside of the fluidized bed B is heated to a high temperature of, for example, 800 ° C. or more due to the combustion of coal, and the boiler body 1, the evaporator 5, the superheater 6, and The heat transfer pipes (hereinafter, referred to as in-layer pipes) arranged in the fluidized bed such as the reheater 7 respectively thermally expand. Therefore, in order to prevent the generation of thermal stress, it is not possible to directly fix the inner layer pipe to the boiler body. Conventionally, a support pipe (not shown) is hung from above the boiler body, and each layer is attached to this support pipe. It had an inner tube attached. However, in such a support structure for an inner-layer pipe, when a horizontal force acts on the inner-layer pipe in the event of an earthquake, for example, the inner-layer pipe largely moves horizontally in the fluidized bed and collides with the wall of the boiler main body. There was a risk of damaging the main body and the inner layer tube. Further, in recent years, it has been demanded to increase the capacity of such a pressurized fluidized bed boiler. However, in a large capacity pressurized fluidized bed boiler, it is necessary to arrange a large number of inner pipes in the fluidized bed densely. In the support structure of the inner layer pipe, there is a possibility that the inner layer pipes may collide with each other and damage the inner layer pipe due to horizontal force due to an earthquake or the like.

【０００４】本発明は、上述した問題点を解決するため
に創案されたものである。すなわち、本発明の目的は、
層内管の熱膨張に対応することができ、かつ地震等の場
合に層内管に水平力が作用しても、層内管同士、及び層
内管とボイラ本体とが衝突するおそれのない流動層ボイ
ラにおける層内管の支持構造を提供することにある。The present invention was created to solve the above-mentioned problems. That is, the object of the present invention is to
Capable of coping with thermal expansion of inner-layer pipes, and there is no risk of collision between inner-layer pipes and between inner-layer pipes and boiler body even if horizontal force acts on inner-layer pipes in the event of an earthquake. The purpose of the present invention is to provide a support structure for an inner layer tube in a fluidized bed boiler.

【０００５】[0005]

【課題を解決するための手段】本発明によれば、内部に
流動層を有し、圧力容器内に格納されたボイラ本体と、
前記ボイラ本体内に上方から吊り下げられた複数の支持
管と、前記支持管に取り付けられた複数の層内管と、を
備える流動層ボイラにおいて、前記層内管は、上下方向
に間隔を隔てた複数の水平管が両端部で互い違いに連結
された構成であり、かつ前記支持管とほぼ同一の鉛直面
内に配置され、更に、層内管の水平管のボイラ本体に隣
接する側の端部と、ボイラ本体とが、両端部に水平ピン
を有する水平な連結部材を介して連結される、ことを特
徴とする流動層ボイラにおける層内管の支持構造が提供
される。本発明の好ましい実施例によれば、前記複数の
層内管は、ほぼ同一の前記鉛直面内に、ほぼ同一の高さ
に、間隔を隔てて複数配置され、該複数の層内管の隣接
する水平管の端部が、両端部に水平ピンを有する水平な
連結部材を介して連結される。According to the present invention, a boiler body having a fluidized bed inside and housed in a pressure vessel,
In a fluidized bed boiler comprising a plurality of support pipes suspended from above in the boiler body, and a plurality of inner layer pipes attached to the support pipes, wherein the inner layer pipes are vertically spaced from each other. A plurality of horizontal pipes are alternately connected at both ends and are arranged in substantially the same vertical plane as the supporting pipe, and further, the end of the horizontal pipe of the in-layer pipe adjacent to the boiler body. There is provided a support structure for an inner layer pipe in a fluidized bed boiler, wherein the portion and the boiler body are connected via horizontal connecting members having horizontal pins at both ends. According to a preferred embodiment of the present invention, the plurality of inner-layer pipes are arranged in the same vertical plane at substantially the same height and at intervals, and the plurality of inner-layer pipes are adjacent to each other. The ends of the horizontal tubes are connected via horizontal connecting members having horizontal pins at both ends.

【０００６】更に、本発明によれば、内部に流動層を有
し、圧力容器内に格納されたボイラ本体と、前記ボイラ
本体内に上方から吊り下げられた複数の支持管と、前記
支持管に取り付けられた複数の層内管と、を備える流動
層ボイラにおいて、前記層内管は、上下方向に間隔を隔
てた複数の水平管が両端部で互い違いに連結された構成
であり、かつ前記支持管とほぼ同一の鉛直面内に配置さ
れ、更に、前記複数の層内管は、ほぼ同一の間隔を隔て
た複数の鉛直面内に、ほぼ同一の高さに、配置され、隣
接する鉛直面内の隣接する層内管の水平管が互いに連結
金物で連結され、更に、ボイラ本体に隣接する前記連結
金物と、ボイラ本体とが、両端部に水平ピンを有する水
平な連結部材を介して連結される、ことを特徴とする流
動層ボイラにおける層内管の支持構造が提供される。本
発明の好ましい実施例によれば、前記ボイラ本体は、鉛
直な水管と該水管を連結するフィンとからなる炉壁と、
該炉壁を間隔を隔てて囲むバックステーと、からなり、
前記ボイラ本体に隣接する前記連結金物は、前記水平な
連結部材を介して炉壁に連結され、更に、前記連結部材
が連結された炉壁の部分は、両端部に水平ピンを有する
別の水平な連結部材を介してバックステーに連結され
る。Further, according to the present invention, a boiler main body having a fluidized bed inside and housed in a pressure vessel, a plurality of support tubes suspended from above in the boiler main body, and the support tube In a fluidized bed boiler comprising a plurality of inner layer pipes attached to the inner layer pipe, the inner layer pipe has a configuration in which a plurality of horizontal pipes spaced apart in the vertical direction are alternately connected at both ends, and The support pipes are arranged in substantially the same vertical plane, and the plurality of in-layer pipes are arranged at substantially the same height in a plurality of vertical planes at substantially the same intervals, and the adjacent vertical pipes are arranged. Horizontal pipes of the in-layer pipes adjacent to each other in the plane are connected to each other by a connecting metal object, and further, the connecting metal object adjacent to the boiler main body and the boiler main body are connected via a horizontal connecting member having horizontal pins at both ends. In a fluidized bed boiler characterized by being connected Support structure in the layer pipe is provided. According to a preferred embodiment of the present invention, the boiler body is a furnace wall composed of a vertical water pipe and fins connecting the water pipe,
A back stay surrounding the furnace wall with a space,
The connecting metal piece adjacent to the boiler body is connected to the furnace wall via the horizontal connecting member, and the part of the furnace wall to which the connecting member is connected is another horizontal plate having horizontal pins at both ends. It is connected to the back stay via another connecting member.

【０００７】[0007]

【作用】上記本発明の構成によれば、層内管が取り付け
られた支持管が上方から吊り下げられ、更に、ボイラ本
体に隣接する層内管の端部が、両端部に水平ピンを有す
る水平な連結部材を介してボイラ本体に連結されるの
で、層内管が熱膨張して僅かに上下しても、層内管は支
持管を介して吊り下げられたまま、層内管の軸線方向に
水平に僅かに移動するのみで、層内管は自由に熱膨張で
き、層内管に無理な熱応力が発生することがない。ま
た、地震等の場合に層内管の軸線方向に水平力が作用し
ても、この水平力は水平な連結部材を介してボイラ本体
に伝達されるので、層内管はボイラ本体内でほとんど移
動せず、層内管とボイラ本体とが衝突するおそれが全く
ない。特に、複数の層内管を、ほぼ同一の鉛直面内に、
ほぼ同一の高さに、間隔を隔てて複数配置し、複数の層
内管の隣接する水平管の端部を、両端部に水平ピンを有
する水平な連結部材を介して連結すれば、複数の層内管
に作用する層内管の軸線方向の水平力を、水平な連結部
材を介してボイラ本体に無理なく伝達することができ
る。According to the above-mentioned structure of the present invention, the support pipe to which the in-layer pipe is attached is suspended from above, and the end of the in-layer pipe adjacent to the boiler body has horizontal pins at both ends. Since it is connected to the boiler main body through a horizontal connecting member, even if the inner layer pipe thermally expands and slightly moves up and down, the inner layer pipe remains suspended from the support pipe, and the axis line of the inner layer pipe The inner pipe can be thermally expanded freely by only slightly moving horizontally in the direction, and undue thermal stress is not generated in the inner pipe. In addition, even if a horizontal force acts in the axial direction of the inner layer pipe in the event of an earthquake, etc., this horizontal force is transmitted to the boiler body via the horizontal connecting member, so the inner layer pipe is almost always inside the boiler body. It does not move and there is no risk of the inner layer tube colliding with the boiler body. In particular, pipes with multiple layers within almost the same vertical plane,
If a plurality of inner pipes in a plurality of layers are arranged at substantially the same height and are spaced apart from each other and end portions of adjacent horizontal pipes are connected via horizontal connecting members having horizontal pins at both end portions, a plurality of The horizontal force in the axial direction of the inner-layer pipe acting on the inner-layer pipe can be reasonably transmitted to the boiler body via the horizontal connecting member.

【０００８】また、上記本発明の構成によれば、複数の
層内管が、ほぼ同一の間隔を隔てた複数の鉛直面内に、
ほぼ同一の高さに、配置され、隣接する鉛直面内の隣接
する層内管の水平管が互いに連結金物で連結され、更
に、ボイラ本体に隣接する連結金物と、ボイラ本体と
が、両端部に水平ピンを有する水平な連結部材を介して
連結されるので、地震等の場合に層内管の軸線に直角方
向に水平力が作用しても、この水平力は連結金物を介
し、かつ水平な連結部材を介してボイラ本体に伝達され
るので、層内管はボイラ本体内でほとんど移動せず、層
内管同士、或いは層内管とボイラ本体とが衝突するおそ
れは全くない。また、層内管が熱膨張して僅かに上下し
ても、層内管は支持管を介して吊り下げられたまま、層
内管の軸線に直角方向に僅かに水平に移動するのみで、
層内管は自由に熱膨張でき、層内管に無理な熱応力が発
生することがない。特に、ボイラ本体に隣接する連結金
物を、水平な連結部材を介して炉壁に連結し、更に、こ
の連結部材が連結された炉壁の部分を、両端部に水平ピ
ンを有する別の水平な連結部材を介してバックステーに
連結すれば、層内管に作用する層内管の軸線に直角方向
な水平力を無理なくバックステーに伝達することができ
る。Further, according to the above-mentioned structure of the present invention, the plurality of inner-layer pipes are provided in the plurality of vertical planes at substantially the same intervals.
Horizontal pipes of adjacent in-layer pipes in adjacent vertical planes are arranged at substantially the same height and are connected to each other by connecting metal parts, and further, the connecting metal parts adjacent to the boiler body and the boiler body are Since it is connected via a horizontal connecting member with a horizontal pin, even if a horizontal force acts in the direction perpendicular to the axis of the in-layer pipe in the event of an earthquake, this horizontal force will pass through the connecting hardware and Since it is transmitted to the boiler main body through such a connecting member, the inner-layer pipe hardly moves in the boiler main body, and there is no possibility of collision between the inner-layer pipes or between the inner-layer pipe and the boiler main body. Further, even if the inner-layer pipe thermally expands and slightly moves up and down, the inner-layer pipe is suspended from the support pipe, and only moves slightly horizontally in the direction perpendicular to the axis of the inner-layer pipe,
The inner layer pipe can be thermally expanded freely, and undue thermal stress is not generated in the inner layer pipe. In particular, the connecting metal piece adjacent to the boiler main body is connected to the furnace wall via a horizontal connecting member, and the part of the furnace wall to which this connecting member is connected is further connected to another horizontal pin having horizontal pins. By connecting to the backstay via the connecting member, a horizontal force acting on the inner-layer pipe in a direction perpendicular to the axis of the inner-layer pipe can be transmitted to the backstay without difficulty.

【０００９】[0009]

【実施例】以下、本発明の好ましい実施例を図面を参照
して説明する。図１は、本発明を適用する加圧流動層ボ
イラの全体構成図である。この図において、加圧流動層
ボイラは、図９と同様に、ボイラ本体１、サイクロン
２、ベッド材貯蔵容器３、等が圧力容器４内に格納され
た構成のものであり、外部から供給さた石炭をボイラ本
体１内で燃焼させ、その排ガスが排ガスマニホールド８
を介してサイクロン２に送られ、サイクロン２で灰が除
去された排ガスは外部のガスタービン（図示せず）に供
給され仕事をするようになっている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of a pressurized fluidized bed boiler to which the present invention is applied. In this figure, the pressurized fluidized bed boiler has a structure in which the boiler body 1, the cyclone 2, the bed material storage container 3 and the like are housed in the pressure container 4, as in FIG. 9, and is supplied from the outside. The burned coal is burned in the boiler body 1, and the exhaust gas is exhausted from the exhaust gas manifold 8
The flue gas sent to the cyclone 2 through the ash and the ash removed by the cyclone 2 is supplied to an external gas turbine (not shown) for work.

【００１０】図２は、図１のＡ−Ａにおける水平断面図
である。この図において、ボイラ本体１は、水平断面が
六角形の内部を有し、６つの鉛直な炉壁１２ａ、１２ｂ
と、六角形の閉じたバックステー１４とからなる。ま
た、六角形の内部は、中心から互いに１２０°隔てた３
本の仮想一点鎖線で３つの空間に区分される。すなわ
ち、六角形の内部は、隣接する２つの炉壁１２ａ、１２
ｂを平行四辺形の２辺とする水平断面が平行四辺形の３
空間からなる。それぞれの空間には、一方の炉壁１２ａ
に平行で、かつ他方の炉壁１２ｂに一端が隣接し、互い
に鉛直面が平行な第１の層内管群１６ａと、一方の炉壁
１２ａに平行で、かつ前記第１の層内管群１６ａの他端
に一端が隣接し、互いに鉛直面が平行な第２の層内管群
１６ｂとが配置されている。FIG. 2 is a horizontal sectional view taken along line AA of FIG. In this figure, the boiler body 1 has a hexagonal interior in horizontal section, and has six vertical furnace walls 12a, 12b.
And a hexagonal closed back stay 14. The inside of the hexagon is 3 degrees apart from the center by 120 °.
It is divided into three spaces by the virtual dashed-dotted line of the book. That is, the inside of the hexagon has two adjacent furnace walls 12a, 12
The horizontal section with b as the two sides of the parallelogram is parallelogram 3
It consists of space. In each space, one furnace wall 12a
And a first inner layer tube group 16a which is adjacent to the other furnace wall 12b at one end and has vertical planes parallel to each other, and a first inner layer tube group 16a which is parallel to the one furnace wall 12a A second inner layer tube group 16b is arranged, one end of which is adjacent to the other end of 16a and whose vertical planes are parallel to each other.

【００１１】図３は、図２における層内管群１６ａ、１
６ｂを構成する層内管２０の側面図である。層内管２０
は、ボイラ本体１内に上方から吊り下げられた支持管１
８に取り付けられており、水を蒸発させる蒸発管２１、
蒸気を高温に加熱する過熱管２２、及び低温の蒸気を再
加熱する再熱管２３からなる。蒸発管２１、過熱管２
２、及び再熱管２３の層内管２０は、図示のように上下
方向に間隔を隔てた複数の水平管が両端部で互い違いに
連結された構成であり、全体として支持管１８とほぼ同
一の鉛直平面内に構成されている。支持管１８は、上部
が山形の矩形ループ部１８ａと、山形の頂点から上方に
延びる吊下げ部１８ｂと、矩形ループ部１８ａの下端か
らボイラ本体の下方に延びる水平Ｕ字部１８ｃとからな
る。支持管１８は、層内管と同様の中空管で構成され、
水平Ｕ字部１８ｃから吊下げ部１８ｂまで通して内部を
蒸気が流れるようになっており、過熱管の一部を構成し
ている。吊下げ部１８ｂの上端は、ボイラ本体内の図示
しない固定部分に枢着されており、これにより支持管１
８はボイラ本体内に上方から吊り下げられる。水平Ｕ字
部１８ｃは、比較的長い水平部分を有し、上下方向に撓
みやすく構成されている。これにより、支持管１８は、
上方から吊り下げられた状態で自由に熱膨張することが
できる。再熱管２３は、支持管１８の鉛直平面内の矩形
ループ部１８ａの内側にその大部分が設けられ、その下
端２３ａから上端２３ｂまで蒸気を流し、低温の蒸気を
再加熱できるようになっている。この再熱管２３は、図
示しない適当な管用のクランプ金具により支持管１８に
取り付けられている。蒸発管２１と過熱管２２は、それ
ぞれ支持管１８の両側（図３で紙面に垂直方向の両側）
に設けられ（図では一方のみを示す）、それぞれの下端
２１ａ、２２ａから上端２１ｂ、２２ｂまで水、蒸気を
それぞれ流し、蒸発、加熱ができるようになっている。
また、蒸発管２１と過熱管２２も、再熱管２３と同様に
適当なクランプ金具により支持管１８に取り付けられて
いる。かかる構成により、層内管２０の全て（蒸発管２
１、過熱管２２、再熱管２３）が、支持管１８に取り付
けられ、支持管の吊下げ部１８ｂを介して、上方から吊
り下げられている。従って、層内管のうち、例えば蒸発
管２１のみをボイラ本体１内で適当な手段により支持す
れば、層内管２０の全て（蒸発管２１、過熱管２２、再
熱管２３）を支持することができる。後述する本発明の
説明において、ボイラ本体等に支持する層内管は、特に
特定しない限り、蒸発管であるのがよい。これは、蒸発
管は内部に水が入っている水管であり、また、ボイラ本
体の炉壁も後述するように水管で構成されているので、
蒸発管とボイラ本体とは温度差が比較的少なく、熱膨張
による影響が少ないためである。なお、層内管２０（蒸
発管２１、過熱管２２、再熱管２３）のそれぞれの上端
及び下端は図示しない別の配管と連結され、内部を水又
は蒸気が通るようになっていることはいうまでもない。FIG. 3 shows inner layer tube groups 16a and 1 in FIG.
It is a side view of the inner layer pipe 20 which comprises 6b. Inner layer pipe 20
Is a support tube 1 suspended from above in the boiler body 1.
8 is attached to the evaporation pipe 21 for evaporating water,
It comprises a superheat pipe 22 for heating the steam to a high temperature and a reheat pipe 23 for reheating the low temperature steam. Evaporation tube 21, superheat tube 2
2, and the inner-layer tube 20 of the reheat tube 23 has a configuration in which a plurality of horizontal tubes, which are vertically spaced apart from each other, are alternately connected at both ends as shown in the drawing, and are substantially the same as the support tube 18 as a whole. It is constructed in the vertical plane. The support pipe 18 is composed of a rectangular loop portion 18a having a mountain-shaped upper portion, a hanging portion 18b extending upward from the apex of the mountain shape, and a horizontal U-shaped portion 18c extending from the lower end of the rectangular loop portion 18a to the lower side of the boiler body. The support tube 18 is composed of a hollow tube similar to the in-layer tube,
Steam flows through the horizontal U-shaped portion 18c to the hanging portion 18b, and constitutes a part of the superheated pipe. The upper end of the hanging portion 18b is pivotally attached to a fixed portion (not shown) in the boiler body, whereby the support tube 1
8 is suspended from above in the boiler body. The horizontal U-shaped portion 18c has a relatively long horizontal portion and is configured to be easily bent in the vertical direction. Thereby, the support tube 18 is
It can be thermally expanded freely while it is suspended from above. Most of the reheat pipe 23 is provided inside the rectangular loop portion 18a in the vertical plane of the support pipe 18, and steam is allowed to flow from the lower end 23a to the upper end 23b to reheat low-temperature steam. . The reheat tube 23 is attached to the support tube 18 by a suitable tube clamp fitting (not shown). The evaporation tube 21 and the superheat tube 22 are on both sides of the support tube 18 (both sides in the direction perpendicular to the paper surface in FIG. 3).
(Only one side is shown in the figure), and water and steam are allowed to flow from the respective lower ends 21a and 22a to the upper ends 21b and 22b for evaporation and heating.
Further, the evaporation pipe 21 and the superheat pipe 22 are also attached to the support pipe 18 by suitable clamp metal fittings like the reheat pipe 23. With this configuration, all of the inner layer tubes 20 (evaporation tube 2
1, the superheater tube 22, and the reheater tube 23) are attached to the support tube 18 and are hung from above via the suspending portion 18b of the support tube. Therefore, of the inner layer tubes, for example, if only the evaporation tube 21 is supported by an appropriate means in the boiler body 1, all the inner layer tubes 20 (evaporation tube 21, superheater tube 22, reheat tube 23) are supported. You can In the following description of the present invention, the inner layer tube supported on the boiler body and the like is preferably an evaporation tube unless otherwise specified. This is because the evaporation pipe is a water pipe containing water inside, and the furnace wall of the boiler body is also composed of a water pipe as described later,
This is because the temperature difference between the evaporator tube and the boiler body is relatively small, and the influence of thermal expansion is small. The upper and lower ends of each of the in-layer pipes 20 (evaporation pipe 21, superheating pipe 22, reheating pipe 23) are connected to other pipes (not shown) so that water or steam can pass through them. There is no end.

【００１２】図４は、図２における平行四辺形の３空間
のうちの１つのＢ−Ｂにおける横断面図である。図の明
瞭化のために蒸発管２１のみを層内管２０として示して
いる。この図において、２つの層内管２０が、ほぼ同一
の鉛直面内で、ほぼ同一の高さに、間隔を隔てて配置さ
れている。FIG. 4 is a cross-sectional view taken along the line B--B of the three spaces of the parallelogram shown in FIG. For clarity of the drawing, only the evaporation pipe 21 is shown as the inner layer pipe 20. In this figure, two in-layer tubes 20 are arranged at substantially the same height and at substantially the same height in the vertical plane.

【００１３】図５は、図４におけるＣ部の拡大図であ
る。この図において、層内管２０の水平管のボイラ本体
１に隣接する側の端部２０ａと、ボイラ本体１とが、両
端部に水平ピン２４を有する水平な連結部材２５を介し
て連結されている。この連結部材２５は層内管２０の上
下方向に少なくとも２つ設けるのがよい。かかる構成に
より、層内管２０が熱膨張して僅かに上下しても、層内
管２０は支持管１８を介して吊り下げられたまま、層内
管２０の軸線方向に水平に僅かに移動するのみで、層内
管２０は自由に熱膨張でき、層内管２０に無理な熱応力
が発生することがない。また、地震等の場合に層内管２
０の軸線方向に水平力が作用しても、この水平力は水平
な連結部材２５を介してボイラ本体１に伝達されるの
で、層内管２０はボイラ本体１内でほとんど移動せず、
層内管２０とボイラ本体１とが衝突するおそれが全くな
い。FIG. 5 is an enlarged view of portion C in FIG. In this figure, the end portion 20a of the horizontal pipe of the in-layer pipe 20 adjacent to the boiler body 1 and the boiler body 1 are connected via a horizontal connecting member 25 having horizontal pins 24 at both ends. There is. It is preferable to provide at least two connecting members 25 in the vertical direction of the inner layer tube 20. With this configuration, even if the inner-layer pipe 20 thermally expands and slightly moves up and down, the inner-layer pipe 20 is horizontally suspended in the axial direction of the inner-layer pipe 20 while being suspended through the support pipe 18. Only by doing so, the in-layer pipe 20 can be thermally expanded freely, and no undue thermal stress is generated in the in-layer pipe 20. In case of an earthquake, etc., the inner pipe 2
Even if a horizontal force acts in the axial direction of 0, this horizontal force is transmitted to the boiler main body 1 via the horizontal connecting member 25, so that the in-layer pipe 20 hardly moves in the boiler main body 1,
There is no risk of the inner layer tube 20 colliding with the boiler body 1.

【００１４】図６は、図４におけるＤ部の拡大図であ
る。この図において、２つの層内管２０は、ほぼ同一の
鉛直面内に、ほぼ同一の高さに、間隔を隔てて配置さ
れ、２つの層内管２０の隣接する水平管の端部２０ｂ、
２０ｃが、両端部に水平ピン２６を有する水平な連結部
材２７を介して連結されている。かかる構成により、２
つの層内管に作用する層内管の軸線方向の水平力を、水
平な連結部材を介してボイラ本体に無理なく伝達するこ
とができる。なお、層内管２０の水平管のボイラ本体１
に隣接する側の端部２０ａは、前述（図５）のようにボ
イラ本体１に連結されているが、別の層内管２０の端部
２０ｃの反対側の端部（図示せず）は、図２における別
の室の層内管群に隣接しているだけであり、ボイラ本
体、その他に連結されていない。これにより、２つの層
内管２０は、層内管の軸線方向に自由に熱膨張すること
ができる。FIG. 6 is an enlarged view of portion D in FIG. In this figure, the two inner-layer pipes 20 are arranged at substantially the same height and at substantially the same height in the vertical plane, and the end portions 20b of adjacent horizontal pipes of the two inner-layer pipes 20 are
20c are connected via a horizontal connecting member 27 having horizontal pins 26 at both ends. With this configuration, 2
A horizontal force in the axial direction of the inner-layer pipes acting on the inner-layer pipes can be reasonably transmitted to the boiler body via the horizontal connecting member. In addition, the boiler body 1 of the horizontal pipe of the in-layer pipe 20
The end portion 20a on the side adjacent to is connected to the boiler body 1 as described above (FIG. 5), but the end portion (not shown) on the opposite side of the end portion 20c of another inner-layer pipe 20 is 2 is only adjacent to the inner layer tube group of another chamber in FIG. 2, and is not connected to the boiler body or the like. Thereby, the two in-layer pipes 20 can freely thermally expand in the axial direction of the in-layer pipe.

【００１５】図７は、図２のＥ部の拡大横断面図であ
る。この図においてボイラ本体に隣接した２本の層内管
２０の水平部が、上下の部材３０ａ、３０ｂがボルト等
で挟持されるようになった連結金物３０により挟持さ
れ、層内管２０の軸線に直角方向の水平力を互いに伝達
できるようになっている。この連結金物３０と、ボイラ
本体１の炉壁１２ａとが、両端部に水平ピン３１を有す
る水平な連結部材３２を介して連結されている。更に、
連結部材３２が連結された炉壁１２ａの部分は、両端部
に水平ピン３３を有する別の水平な連結部材３４を介し
てバックステー１４に連結されている。かかる構成によ
り、ボイラ本体に隣接した２本の層内管２０から炉壁１
２ａを介してバックステー１４まで層内管の軸線に直角
方向の水平力を伝達することができる。更に、図２に示
すように、図７に示した連結金物３０により、隣接する
鉛直面内の隣接する層内管２０の水平管が互いに互い違
いに連結されている。かかる構成により、地震等の場合
に層内管２０の軸線に直角方向に水平力が作用しても、
この水平力は連結金物３０を介し、かつ水平な連結部材
３２、３４を介してボイラ本体のバックステー１４に伝
達されるので、層内管２０はボイラ本体内でほとんど移
動せず、層内管同士、或いは層内管とボイラ本体とが衝
突するおそれは全くなくなる。また、層内管２０が熱膨
張して僅かに上下しても、層内管２０は支持管を介して
吊り下げられたまま、層内管２０の軸線に直角方向に僅
かに水平に移動するのみで、層内管２０は自由に熱膨張
でき、層内管２０に無理な熱応力が発生することがな
い。なお、図７に示すように、バックステー１４の断面
は、平板により閉じた矩形に構成され、十分な剛性を有
するように構成されている。FIG. 7 is an enlarged cross-sectional view of portion E in FIG. In this figure, the horizontal portions of the two inner-layer pipes 20 adjacent to the boiler body are clamped by the connecting metal member 30 in which the upper and lower members 30a, 30b are clamped by bolts or the like. The horizontal force can be transmitted to each other at right angles to each other. The connecting hardware 30 and the furnace wall 12a of the boiler body 1 are connected via a horizontal connecting member 32 having horizontal pins 31 at both ends. Furthermore,
The portion of the furnace wall 12a to which the connecting member 32 is connected is connected to the backstay 14 via another horizontal connecting member 34 having horizontal pins 33 at both ends. With this configuration, the two inner wall tubes 20 adjacent to the boiler body are connected to the furnace wall 1
A horizontal force in a direction perpendicular to the axis of the inner layer pipe can be transmitted to the back stay 14 via 2a. Further, as shown in FIG. 2, the horizontal pipes of the adjacent in-layer pipes 20 in the adjacent vertical planes are alternately connected by the connecting metal piece 30 shown in FIG. With this configuration, even if a horizontal force acts in a direction perpendicular to the axis of the inner layer pipe 20 in the event of an earthquake,
This horizontal force is transmitted to the back stay 14 of the boiler main body through the connecting hardware 30 and the horizontal connecting members 32 and 34, so that the inner layer pipe 20 hardly moves in the boiler main body, and There is no risk of collision between the inner tubes and the boiler body. Further, even if the inner-layer pipe 20 thermally expands and slightly moves up and down, the inner-layer pipe 20 moves slightly horizontally in a direction perpendicular to the axis of the inner-layer pipe 20 while being suspended through the support pipe. Only by doing so, the in-layer pipe 20 can freely undergo thermal expansion, and undue thermal stress does not occur in the in-layer pipe 20. Note that, as shown in FIG. 7, the cross section of the backstay 14 is formed into a rectangular shape closed by a flat plate, and is configured to have sufficient rigidity.

【００１６】図８は、図２におけるＦ部の拡大斜視図で
ある。この図において、ボイラ本体１は、鉛直な水管１
１ａとこの水管１１ａを連結するフィン１１ｂとからな
る炉壁１２ａ、１２ｂと、炉壁を間隔を隔てて囲むバッ
クステー１４とからなる。また、炉壁１２ａ、１２ｂと
バックステー１４とは、両端部に水平ピン３５を有する
上下対の傾斜した連結部材３６を介して連結される。こ
の上下対の傾斜連結部材３６により三角形状のトラスが
構成され、炉壁１２ａ、１２ｂとバックステー１４とが
一体化されている。更に、バックステー１４は水平方向
外方に放射状に延びる少なくとも３つの突起部１４ａを
有し、この突起部１４ａは、圧力容器４の内面に摺動金
具４ａにより半径方向及び上下方向に摺動可能に案内さ
れている。かかる構成により、バックステー１４の上下
動及び半径方向移動を許容し、同時にバックステー１４
の水平移動と回転を阻止することができる。FIG. 8 is an enlarged perspective view of the F portion in FIG. In this figure, the boiler body 1 is a vertical water pipe 1
1a and fins 11b connecting the water pipes 11a, furnace walls 12a and 12b, and a back stay 14 surrounding the furnace wall with a space therebetween. Further, the furnace walls 12a, 12b and the back stay 14 are connected to each other via a pair of vertically inclined connecting members 36 having horizontal pins 35 at both ends. The pair of upper and lower inclined connecting members 36 form a triangular truss, and the furnace walls 12a and 12b and the back stay 14 are integrated. Further, the back stay 14 has at least three protrusions 14a extending radially outward in the horizontal direction, and the protrusions 14a can be slid on the inner surface of the pressure container 4 in the radial direction and the vertical direction by the sliding fittings 4a. Is being guided to. With this structure, the back stay 14 is allowed to move up and down and move in the radial direction, and at the same time, the back stay 14 is moved.
The horizontal movement and rotation of the can be prevented.

【００１７】[0017]

【発明の効果】上述したように、本発明の構成によれ
ば、層内管は自由に熱膨張でき、層内管に無理な熱応力
が発生することがない。また、地震等の場合に層内管の
軸線方向又は軸線に直角方向に水平力が作用しても、こ
の水平力は水平な連結部材を介してボイラ本体に伝達さ
れるので、層内管はボイラ本体内でほとんど移動せず、
層内管とボイラ本体とが衝突するおそれは全くない。従
って、本発明により、層内管の熱膨張に対応することが
でき、かつ地震等の場合に層内管に水平力が作用して
も、層内管同士、及び層内管とボイラ本体とが衝突する
おそれのない流動層ボイラにおける層内管の支持構造を
提供することができる。As described above, according to the structure of the present invention, the inner layer pipe can be thermally expanded freely, and an unreasonable thermal stress is not generated in the inner layer pipe. In addition, in the event of an earthquake or the like, even if a horizontal force acts on the inner layer pipe in the axial direction or in the direction perpendicular to the axis line, this horizontal force is transmitted to the boiler main body via the horizontal connecting member, so the inner layer pipe is Hardly moved within the boiler body,
There is no possibility of collision between the inner pipe and the boiler body. Therefore, according to the present invention, it is possible to cope with the thermal expansion of the inner-layer pipes, and even if a horizontal force acts on the inner-layer pipes in the event of an earthquake, etc., the inner-layer pipes, and between the inner-layer pipes and the boiler body, It is possible to provide a support structure for an inner-layer pipe in a fluidized-bed boiler in which there is no risk of collision between the two.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明を適用する加圧流動層ボイラの全体構成
図である。FIG. 1 is an overall configuration diagram of a pressurized fluidized bed boiler to which the present invention is applied.

【図２】図１のＡ−Ａにおける水平断面図である。FIG. 2 is a horizontal sectional view taken along line AA of FIG.

【図３】図２における層内管群１６ａ、１６ｂを構成す
る層内管２０の側面図である。FIG. 3 is a side view of an inner layer tube 20 forming the inner layer tube groups 16a and 16b in FIG.

【図４】図２における平行四辺形の３空間のうちの１つ
のＢ−Ｂにおける横断面図である。4 is a transverse cross-sectional view taken along the line BB of the three spaces of the parallelogram shown in FIG.

【図５】図４におけるＣ部の拡大図である。5 is an enlarged view of a C portion in FIG.

【図６】図４におけるＤ部の拡大図である。FIG. 6 is an enlarged view of part D in FIG.

【図７】図２のＥ部における拡大断面図である。7 is an enlarged cross-sectional view of a portion E of FIG.

【図８】図２のＦ部の拡大斜視図である。FIG. 8 is an enlarged perspective view of an F portion of FIG.

【図９】従来の加圧流動層ボイラの全体構成図である。FIG. 9 is an overall configuration diagram of a conventional pressurized fluidized bed boiler.

【符号の説明】[Explanation of symbols]

１ ボイラ本体 ２ サイクロン ３ ベッド材貯蔵容器 ４ 圧力容器 ５ 蒸発器 ６ 過熱器 ７ 再熱器 ８ 排ガスマニホールド １１ａ 水管 １１ｂ フィン １２ａ、１２ｂ 炉壁 １４ バックステー １４ａ 突起部 １６ａ 第１の層内管群 １６ｂ 第２の層内管群 １８ 支持管 ２０ 層内管 ２１ 蒸発管 ２２ 過熱管 ２３ 再熱管 ２４、２６、３１、３３、３５ 水平ピン ２５、２７、３２、３４、３６ 連結部材 ３０ 連結金物 Ａ 空気 Ｂ 流動層 Ｃ 石炭 1 Boiler main body 2 Cyclone 3 Bed material storage container 4 Pressure vessel 5 Evaporator 6 Superheater 7 Reheater 8 Exhaust gas manifold 11a Water pipe 11b Fins 12a, 12b Furnace wall 14 Backstay 14a Projection 16a First layer inner tube group 16b Second layer inner pipe group 18 Support pipe 20 Layer inner pipe 21 Evaporation pipe 22 Superheat pipe 23 Reheat pipe 24, 26, 31, 33, 35 Horizontal pin 25, 27, 32, 34, 36 Connecting member 30 Connecting hardware A Air B fluidized bed C coal

Claims (8)

【特許請求の範囲】[Claims] 【請求項１】 内部に流動層を有し、圧力容器内に格納
されたボイラ本体と、 前記ボイラ本体内に上方から吊り下げられた複数の支持
管と、 前記支持管に取り付けられた複数の層内管と、を備える
流動層ボイラにおいて、 前記層内管は、上下方向に間隔を隔てた複数の水平管が
両端部で互い違いに連結された構成であり、かつ前記支
持管とほぼ同一の鉛直面内に配置され、 更に、層内管の水平管のボイラ本体に隣接する側の端部
と、ボイラ本体とが、両端部に水平ピンを有する水平な
連結部材を介して連結される、ことを特徴とする流動層
ボイラにおける層内管の支持構造。1. A boiler main body having a fluidized bed inside and stored in a pressure vessel, a plurality of support pipes suspended from above in the boiler main body, and a plurality of support pipes attached to the support pipes. In a fluidized bed boiler including an inner-layer pipe, the inner-layer pipe has a configuration in which a plurality of horizontal pipes which are vertically spaced from each other are alternately connected at both ends, and are substantially the same as the support pipe. Arranged in the vertical plane, further, the end portion of the horizontal pipe of the inner-layer pipe adjacent to the boiler body, and the boiler body are connected via a horizontal connecting member having horizontal pins at both ends. A support structure for an inner layer pipe in a fluidized bed boiler, which is characterized in that 【請求項２】 前記複数の層内管は、ほぼ同一の前記鉛
直面内に、ほぼ同一の高さに、間隔を隔てて複数配置さ
れ、該複数の層内管の隣接する水平管の端部が、両端部
に水平ピンを有する水平な連結部材を介して連結され
る、ことを特徴とする請求項１に記載の流動層ボイラに
おける層内管の支持構造。2. The plurality of inner-layer pipes are arranged at substantially the same height and at substantially the same height in the same vertical plane at intervals, and ends of adjacent horizontal pipes of the plurality of inner-layer pipes. 2. The support structure for an inner layer pipe in a fluidized bed boiler according to claim 1, wherein the parts are connected via horizontal connecting members having horizontal pins at both ends. 【請求項３】 前記ボイラ本体は、鉛直な水管と該水管
を連結するフィンとからなる炉壁と、該炉壁を間隔を隔
てて囲むバックステーと、からなり、 前記炉壁とバックステーとは、両端部に水平ピンを有す
る上下対の傾斜した連結部材を介して連結され、該上下
対の連結部材により三角形状のトラスが構成され、 更に、前記バックステーは水平方向外方に放射状に延び
る少なくとも３つの突起部を有し、該突起部は、前記圧
力容器の内面に半径方向及び上下方向に摺動可能に案内
されている、ことを特徴とする請求項１に記載の流動層
ボイラにおける層内管の支持構造。3. The boiler main body comprises a furnace wall composed of a vertical water pipe and fins connecting the water pipe, and a backstay surrounding the furnace wall with a space therebetween. Are connected via a pair of vertically inclined connecting members having horizontal pins at both ends, and the pair of upper and lower connecting members form a triangular truss. Further, the back stay is radially outward in the horizontal direction. The fluidized bed boiler according to claim 1, wherein the fluidized bed boiler has at least three protrusions that extend, and the protrusions are slidably guided in an inner surface of the pressure vessel in a radial direction and a vertical direction. Structure of the inner layer pipe in. 【請求項４】 内部に流動層を有し、圧力容器内に格納
されたボイラ本体と、 前記ボイラ本体内に上方から吊り下げられた複数の支持
管と、 前記支持管に取り付けられた複数の層内管と、を備える
流動層ボイラにおいて、 前記層内管は、上下方向に間隔を隔てた複数の水平管が
両端部で互い違いに連結された構成であり、かつ前記支
持管とほぼ同一の鉛直面内に配置され、 更に、前記複数の層内管は、ほぼ同一の間隔を隔てた複
数の鉛直面内に、ほぼ同一の高さに、配置され、 隣接する鉛直面内の隣接する層内管の水平管が互いに連
結金物で連結され、 更に、ボイラ本体に隣接する前記連結金物と、ボイラ本
体とが、両端部に水平ピンを有する水平な連結部材を介
して連結される、ことを特徴とする流動層ボイラにおけ
る層内管の支持構造。4. A boiler body having a fluidized bed inside and stored in a pressure vessel, a plurality of support tubes suspended from above in the boiler body, and a plurality of support tubes attached to the support tubes. In a fluidized bed boiler including an inner-layer pipe, the inner-layer pipe has a configuration in which a plurality of horizontal pipes which are vertically spaced from each other are alternately connected at both ends, and are substantially the same as the support pipe. The pipes are arranged in a vertical plane, and the inner pipes in the plurality of layers are arranged in the plurality of vertical planes at substantially the same distance and at substantially the same height, and the adjacent layers in the adjacent vertical planes are adjacent to each other. The horizontal pipes of the inner pipe are connected to each other by a connecting metal piece, and further, the connecting metal piece adjacent to the boiler body and the boiler body are connected via a horizontal connecting member having horizontal pins at both ends. Supporting structure of inner-layer pipe in a fluidized bed boiler. . 【請求項５】 前記ボイラ本体は、鉛直な水管と該水管
を連結するフィンとからなる炉壁と、該炉壁を間隔を隔
てて囲むバックステーと、からなり、 前記ボイラ本体に隣接する前記連結金物は、前記水平な
連結部材を介して炉壁に連結され、更に、前記連結部材
が連結された炉壁の部分は、両端部に水平ピンを有する
別の水平な連結部材を介してバックステーに連結され
る、ことを特徴とする請求項４に記載の流動層ボイラに
おける層内管の支持構造。5. The boiler main body comprises a furnace wall composed of a vertical water pipe and fins connecting the water pipe, and a backstay surrounding the furnace wall with a space therebetween. The connecting hardware is connected to the furnace wall via the horizontal connecting member, and the part of the furnace wall to which the connecting member is connected is backed via another horizontal connecting member having horizontal pins at both ends. The support structure for an inner layer tube in a fluidized bed boiler according to claim 4, wherein the support structure is connected to a stay. 【請求項６】 前記層内管は、蒸発管、過熱管、及び再
熱管からなり、蒸発管のみボイラ本体に連結される、こ
とを特徴とする請求項１又は４に記載の流動層ボイラに
おける層内管の支持構造。6. The fluidized bed boiler according to claim 1, wherein the inner-layer pipe includes an evaporation pipe, a superheating pipe, and a reheating pipe, and only the evaporation pipe is connected to the boiler body. Support structure for inner layer pipe. 【請求項７】 前記ボイラ本体は、水平断面が六角形の
内部を有し、６つの鉛直な炉壁と、六角形の閉じたバッ
クステーとからなる、ことを特徴とする請求項１又は４
に記載の流動層ボイラにおける層内管の支持構造。7. The boiler main body has a horizontal cross section having a hexagonal interior, and comprises six vertical furnace walls and a hexagonal closed backstay.
A support structure for an inner-layer pipe in the fluidized bed boiler according to 1. 【請求項８】 前記六角形の内部は、隣接する２つの炉
壁を平行四辺形の２辺とする水平断面が平行四辺形の３
空間からなり、それぞれの空間には、一方の炉壁に平行
で、かつ他方の炉壁に一端が隣接する互いに鉛直面が平
行な第１の層内管群と、一方の炉壁に平行で、かつ前記
第１の層内管群の他端にその一端が隣接する互いに鉛直
面が平行な第２の層内管群とが配置される、ことを特徴
とする請求項７に記載の流動層ボイラにおける層内管の
支持構造。8. The inside of the hexagon is a parallelogram 3 having a horizontal section with two adjacent furnace walls serving as two sides of the parallelogram.
Each of the spaces is composed of a first group of in-layer tubes parallel to one furnace wall and one end of which is adjacent to the other furnace wall and parallel to each other in the vertical plane, and parallel to one furnace wall. 9. The flow according to claim 7, further comprising: a second inner layer tube group having one end adjacent to the other end of the first inner layer tube group and having vertical planes parallel to each other. Support structure for inner layer pipe in single layer boiler.