JP3621711B2 - Gas fired exhaust gas boiler - Google Patents

Gas fired exhaust gas boiler Download PDF

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Publication number
JP3621711B2
JP3621711B2 JP27949293A JP27949293A JP3621711B2 JP 3621711 B2 JP3621711 B2 JP 3621711B2 JP 27949293 A JP27949293 A JP 27949293A JP 27949293 A JP27949293 A JP 27949293A JP 3621711 B2 JP3621711 B2 JP 3621711B2
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JP
Japan
Prior art keywords
heat transfer
header
exhaust gas
transfer tubes
gas boiler
Prior art date
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Expired - Lifetime
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JP27949293A
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Japanese (ja)
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JPH07133902A (en
Inventor
聰樹 甕
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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Description

【0001】
【産業上の利用分野】
本発明は、伝熱管と管寄せとの接続方式を改良したガス竪流れ型排ガスボイラに関する。
【0002】
【従来の技術】
従来のガス竪流れ型排ガスボイラ1例を、図4及び図5によって説明する。図4に示すように、下方から上方へ向ってガスが竪流れする排ガスボイラ1は、その全体の荷重伝達のために、排ガスボイラ1内に設置される伝熱管群2と、その荷重を吊り下げ構造として支持するためにガスダクト内に設置されたホットビーム19と、このホットビーム19からの荷重を地面に伝達させるための支持架構13、16を備えている。また、排ガスボイラ1は、前記の部材の他に、伝熱管群2の管端部にガス流れの両側に設けられた対をなすガス案内板6およびその外側に対をなす管寄せ収納部3、さらに燃焼排ガスを完全にシールするためのケーシング部20を備えている。排ガスボイラ1の高温ガス入口部は、入口高温ダクト14と入口プレナム15により構成され、排ガスボイラ1の出口部は低温ダクト11により構成されている。
【0003】
図示される排ガスボイラ1は二段圧力式であり、高圧蒸気発生系に装備される高圧蒸気ドラム17は、支持架構16の上に設けられた支持架台18の上に設置されている。一方、低圧蒸気発生系に装備される低圧蒸気ドラム10は、支持架構13の上に設けられた支持架台12の上に設置されている。
【0004】
図5に示すように、排ガスボイラ1内のガス流れの側部の管寄せ収納部3内には、互いに間隔をおいてそれぞれ1個の下方の入口管寄せ4と1個の上方の出口管寄せ5が配置され、入口管寄せ4と出口管寄せ5に伝熱管群2を形成する複数の伝熱管2aの両端部が接続され、伝熱管群2は、ガス流れを横切るように水平に配置され、かつ、ガス流れの両側においてU字形に湾曲されており、排ガスボイラ1内において伝熱面を構成している。
【0005】
伝熱管群2は、管内流量を確保するために、通常水平方向に列をなし、かつ、上下方向に間隔をおいて配置された4列又はそれ以上の列をなす複数の伝熱管2aで構成され、この上下方向に4列又はそれ以上の列をなす伝熱管2aの両端部は、図5に示すように、入口管寄せ4と出口管寄せ5に溶接によって接続されている(本明細書ではこれを4本取り又はそれ以上の本数取りという)。
【0006】
記従来のガス竪流れ型排ガスボイラにおける伝熱管の管寄せに接続される位置を、図6に示す。図6は、4本取りの伝熱管群2において、入口管寄せ4及び出口管寄せ5に接続される伝熱管2aの部分を黒丸で示し、それ以外の伝熱管2aの部分を白丸で示している。
【0007】
図6に示すように、伝熱管2aを入口管寄せ4と出口管寄せ5に溶接して接続する部分では、黒丸で示す隣接する複数の伝熱管2aがそれぞれ入口管寄せ4又は出口管寄せ5に接続されているために、接続される伝熱管2aの部分の間のピッチが小さい。従って、伝熱管2aを前記管寄せ4、5へ溶接するために広い作業スペースが必要となり、図4及び図5中に示す管寄せ収納部3の水平方向の寸法L及び入口管寄せ4と出口管寄せ5との間の上下方向の寸法H(高さ方向の寸法)が大きくなり、排ガスボイラ全体を大型化する要因の一つとなっている。特に、伝熱管の本取り数の多い伝熱管群(蒸発器系統等)においては、この傾向が顕著である。
【0008】
本発明は、以上の問題点を解決することができるガス竪流れ型排ガスボイラを提供しようとするものである。
【0009】
【課題を解決するための手段】
本発明は、上下に間隔をおいて配置された入口管寄せと出口管寄せとに両端部が接続されガス流れを横切って配置された複数の伝熱管によって構成される伝熱管群を備えたガス竪流れ型排ガスボイラにおいて、入口管寄せと出口管寄せのそれぞれに伝熱管を2本取りに接続し、左右の一方の組の上下に隣接する伝熱管の間に他方の組の伝熱管を配置したことを特徴とする。
【0010】
【作用】
本発明では、入口管寄せと出口管寄せに伝熱管をそれぞれ2本取りの方式で接続し、左右の一方の組の上下に隣接する伝熱管の間に他方の組の伝熱管を配置しているために、前記入口管寄せと出口管寄せに接続されるこれらの伝熱管の部分の間のピッチが大きくなり、伝熱管の前記管寄せとの接続部において、溶接等の接続作業に要するスペースを小さくすることができる。また、2本取りとすることによって管寄せの寸法も小さくてすむ。従って、排ガスボイラ全体を小形化することが可能になる。
【0011】
なお、本発明では伝熱管の本取りを2本と少なくしているので、伝熱管1本あたりが受持つ管内流量が増加し、管内圧力損失が許容値に納まらなくなるおそれがあるが、伝熱管1本あたりの管内通過流量を計画条件にそろえるように、2本取りの管寄せ数を調整することによって、この問題は容易に解決され、排ガスボイラの性能に悪影響を及ぼすことはない。
【0012】
【実施例】
本発明の第1の実施例を、図1及び図2によって説明する。本実施例は、図4ないし図6に示される型式のガス竪流れ型排ガスボイラにおいて、入口管寄せ4、出口管寄せ5及び伝熱管群2を次のように構成したものである。
【0013】
伝熱管群2は、水平方向に列をなし、かつ、上下方向に間隔をおいて2列をなして配置された複数の伝熱管2aによって構成されている。排ガスボイラ1内を矢印に示すように上下方向に竪方向に流れるガスの流れの両側には、対をなすガス案内板6が設けられ、その外側には対をなす管寄せ収納部3が設けられている。
【0014】
各管寄せ収納部3内には、間隔をおいて下方の入口管寄せ4と上方の出口管寄せ5が配置されており、前記上下方向に2列をなす伝熱管2aの両端は、それぞれ入口管寄せ4と出口管寄せ5に溶接によって接続(2本取り)されている。伝熱管群2は、排ガスボイラ1内のガス流れを横切るように水平に配置されており、かつ、ガス流れの両側の管寄せ収納部3内でU字形に湾曲されていて、排ガスボイラ1内において伝熱面を形成している。ガス流れの各側部にある入口管寄せ4と出口管寄せ5との間に前記のように伝熱管群2が形成されているので、排ガスボイラ1は、図1に示すように、左右の2組の入口管寄せ4、出口管寄せ5及び伝熱管群2を具備している。また、図1に示すように、一方の組の上下に隣接する伝熱管2a、2aの間に、他方の組の伝熱管2aが配置されるようになっている。
【0015】
図2に、図1の左側の入口管寄せ4と出口管寄せ5とに接続される伝熱管群2の部分を示す。図中黒丸は、一方の組の前記管寄せ4、5に接続される部分にある伝熱管2aを示し、白丸は、一方の組の伝熱管2aのその他の部分と他の組の伝熱管2aを示している。
【0016】
図2に示すように、入口管寄せ4と出口管寄せ5は上下に2列をなす複数の伝熱管2aが接続される2本取りの接続方式を採用しており、かつ、黒丸で示される一方の組の伝熱管2aの管寄せ4、5に接続される部分の隣接するものの間には、他方の組の伝熱管2aが配置されているために、管寄せ4、5に接続される伝熱管2aの間の間隔が広がる。
【0017】
従って、入口管寄せ4と出口管寄せ5において、伝熱管2aの溶接による接続作業を容易に行うことができ、管寄せ収納部3の水平方向の寸法Lと両管寄せ間の上下方向の寸法Hを小さくし、かつ、管寄せ4、5の寸法も小さくすることができる。これによって、本実施例では、排ガスボイラ1全体を小形化することが可能である。
【0018】
また、本実施例では、伝熱管を2本取りで接続する各管寄せ4、5においては、接続される伝熱管2aの数が減少するが、管寄せ4、5と伝熱管群2を2組備えているために、各伝熱管2a1本当りが受持つ管内流量を計画条件内にすることが可能であり、管内圧力損失を抑えて所定の性能を実現することができる。
【0019】
本発明の第2の実施例を、図3によって説明する。本実施例は、従来のガス竪流れ型排ガスボイラの8本取りの管寄せの配置に対応するものであり、ガス流れの両側の各々に、それぞれ2個ずつ下方に位置して上下に位置をずらせた入口管寄せ4と上方に位置して上下に位置をずらせた出口管寄せ5を配置し、かつ、ガス流れの両側の対応するもの同士が同じ高さにあるように配置し、入口管寄せ4と出口管寄せ5の各々に上下に2列をなす複数の伝熱管2aを2本取りの方式で接続したものである。従って、本実施例では、図3の左側と右側にそれぞれ2組、計4組の入口管寄せ4、出口管寄せ5及び伝熱管群2の組が構成されており、前記第1の実施例におけると同様に、対応する左右の組の一方の上下に隣接する伝熱管2aの間に他方の組の伝熱管2aが配置されている。また、本実施例では、図3に示すように、伝熱管2aはガス流れの他側の管寄せ収納部3内でU字形に1回湾曲しており、かつ、ガス流れの各側において、最下位の入口管寄せ4に1端部が接続された伝熱管2aの他端部は最上位の出口管寄せ5に接続されており、また、上下方向の中間の入口管寄せ4に1端部が接続された伝熱管2aの他端部は上下方向中間の出口管寄せ5に接続されている。
【0020】
本実施例においても、前記第1の実施例と同様に寸法L及びHを小さくして、排ガスボイラ1の全体を小形化することができる。
【0021】
【発明の効果】
本発明は、ガス竪流れ型排ガスボイラにおいて、入口管寄せと出口管寄せに伝熱管を2本取りに接続し、左右の一方の組の上下に隣接する伝熱管の間に他方の組の伝熱管を配置しているために、従来のガス竪流れ型排ガスボイラと比較して排ガスボイラの管寄せ収納部の水平方向の寸法と入口管寄せと出口管寄せ間の上下方向の寸法を減させることができ、排ガスボイラ全体をコンパクトにすることができる。
【図面の簡単な説明】
【図1】本発明の第1の実施例の要部の立面図である。
【図2】同第1の実施例の管寄せへの接続部における伝熱管の配置を示す説明図である。
【図3】本発明の第2の実施例の要部の立面図である。
【図4】従来のガス竪流れ型排ガスボイラの1例の構成を示す縦断面図である。
【図5】同従来のガス竪流れ型排ガスボイラの要部の立面図である。
【図6】同従来のガス竪流れ型排ガスボイラの管寄せへの接続部における伝熱管の配置を示す説明図である。
【符号の説明】
1 排ガスボイラ
2 伝熱管群
2a 伝熱管
3 管寄せ収納部
4 入口管寄せ
5 出口管寄せ
6 ガス案内板
[0001]
[Industrial application fields]
TECHNICAL FIELD The present invention relates to a gas-fired exhaust gas boiler having an improved connection system between a heat transfer tube and a header.
[0002]
[Prior art]
An example of a conventional gas vertical flow type exhaust gas boiler, is described by FIGS. As shown in FIG. 4, the exhaust gas boiler 1 in which gas flows from the lower side to the upper side is suspended by a heat transfer tube group 2 installed in the exhaust gas boiler 1 and the load for the entire load transmission. A hot beam 19 installed in the gas duct for supporting as a lowered structure, and support frames 13 and 16 for transmitting a load from the hot beam 19 to the ground are provided. In addition to the above-described members, the exhaust gas boiler 1 includes a pair of gas guide plates 6 provided on both ends of the gas flow at the tube end of the heat transfer tube group 2, and a header housing portion 3 that forms a pair on the outside thereof. Further, a casing portion 20 for completely sealing the combustion exhaust gas is provided. The hot gas inlet portion of the exhaust gas boiler 1 is constituted by an inlet high temperature duct 14 and an inlet plenum 15, and the outlet portion of the exhaust gas boiler 1 is constituted by a low temperature duct 11.
[0003]
Exhaust gas boiler 1 shown is a two-stage pressure-type, high-pressure steam drum 17 to be mounted to a high pressure steam generating system is mounted on the support cradle 18 provided on the supporting Jika構16. On the other hand, low-pressure steam drum 10 to be mounted to the low pressure steam generating system is mounted on the support cradle 12 provided on the supporting Jika構13.
[0004]
As shown in FIG. 5, in the header housing 3 at the side of the gas flow in the exhaust gas boiler 1, one lower inlet header 4 and one upper outlet tube are spaced apart from each other. A header 5 is disposed, and both ends of a plurality of heat transfer tubes 2a forming the heat transfer tube group 2 are connected to the inlet header 4 and the outlet header 5, and the heat transfer tube group 2 is disposed horizontally so as to cross the gas flow. In addition, it is curved in a U shape on both sides of the gas flow and constitutes a heat transfer surface in the exhaust gas boiler 1.
[0005]
The heat transfer tube group 2 is composed of a plurality of heat transfer tubes 2a that form a row in the horizontal direction and have four or more rows arranged at intervals in the vertical direction in order to ensure the flow rate in the tube. As shown in FIG. 5, both ends of the heat transfer tubes 2a that form four or more rows in the vertical direction are connected to the inlet header 4 and the outlet header 5 by welding (this specification). (This is called taking four or more.)
[0006]
The position to be connected to a tube pulling the heat transfer tubes before Symbol conventional gas vertical flow type exhaust gas boiler, shown in Fig. FIG. 6 shows the heat transfer tube 2a connected to the inlet header 4 and the outlet header 5 with black circles in the four-tube heat transfer tube group 2, and the other heat transfer tube 2a portions with white circles. Yes.
[0007]
As shown in FIG. 6, in a portion where the heat transfer tube 2 a is welded to the inlet header 4 and the outlet header 5, a plurality of adjacent heat transfer tubes 2 a indicated by black circles are respectively the inlet header 4 or the outlet header 5. Therefore, the pitch between the portions of the heat transfer tubes 2a to be connected is small. Accordingly, a large work space is required to weld the heat transfer tube 2a to the headers 4 and 5, and the horizontal dimension L of the header storage portion 3 shown in FIGS. The vertical dimension H (height dimension) between the header 5 is increased, which is one of the factors for increasing the size of the exhaust gas boiler as a whole. In particular, this tendency is remarkable in the heat transfer tube group (evaporator system etc.) having a large number of heat transfer tubes.
[0008]
The present invention is intended to provide a gas-fired exhaust gas boiler that can solve the above problems.
[0009]
[Means for Solving the Problems]
The present invention provides a gas having a heat transfer tube group composed of a plurality of heat transfer tubes arranged at both ends of an inlet header and an outlet header arranged at intervals in the vertical direction and arranged across a gas flow. In a vertical flow type exhaust gas boiler, two heat transfer tubes are connected to each of the inlet header and outlet header, and the other set of heat transfer tubes is placed between the upper and lower adjacent heat transfer tubes. characterized in that it was.
[0010]
[Action]
In the present invention, two heat transfer tubes are connected to the inlet header and the outlet header, respectively, and the other set of heat transfer tubes is arranged between the upper and lower adjacent heat transfer tubes. Therefore, the pitch between the portions of the heat transfer tubes connected to the inlet header and the outlet header is increased, and the space required for connection work such as welding at the connection portion of the heat transfer tubes with the header. Can be reduced. Moreover, the size of the header can be reduced by using two. Therefore, it becomes possible to reduce the size of the entire exhaust gas boiler.
[0011]
In the present invention, since the number of heat transfer tubes is reduced to two, the flow rate in the tube per heat transfer tube increases and the pressure loss in the tube may not be within the allowable value. This problem can be easily solved by adjusting the number of pipes taken by two pipes so that the flow rate in the pipe per pipe matches the planned condition, and the performance of the exhaust gas boiler is not adversely affected.
[0012]
【Example】
A first embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the inlet header 4, the outlet header 5, and the heat transfer tube group 2 are configured as follows in the gas-fired exhaust gas boiler of the type shown in FIGS.
[0013]
The heat transfer tube group 2 is composed of a plurality of heat transfer tubes 2a arranged in rows in the horizontal direction and arranged in two rows at intervals in the vertical direction. A pair of gas guide plates 6 are provided on both sides of the gas flow flowing in the vertical direction as indicated by the arrow in the exhaust gas boiler 1, and a pair of header storage portions 3 are provided on the outside thereof. It has been.
[0014]
In each header storage section 3, a lower inlet header 4 and an upper outlet header 5 are arranged at intervals, and both ends of the two heat transfer tubes 2a in the vertical direction are respectively connected to the inlet header 4a. The header 4 and the outlet header 5 are connected to each other by welding (two pieces). The heat transfer tube group 2 is horizontally disposed so as to cross the gas flow in the exhaust gas boiler 1 and is curved in a U shape in the header housing portions 3 on both sides of the gas flow. The heat transfer surface is formed at. Since the heat transfer tube group 2 is formed between the inlet header 4 and the outlet header 5 on each side of the gas flow as described above, the exhaust gas boiler 1 has left and right as shown in FIG. Two sets of inlet header 4, outlet header 5, and heat transfer tube group 2 are provided. Moreover, as shown in FIG. 1, the heat transfer tube 2a of the other group is arranged between the heat transfer tubes 2a, 2a adjacent to the upper and lower sides of one set.
[0015]
FIG. 2 shows a portion of the heat transfer tube group 2 connected to the left inlet header 4 and the outlet header 5 in FIG. In the figure, black circles indicate the heat transfer tubes 2a in the portion connected to one set of the headers 4 and 5, and white circles indicate the other portions of the one set of heat transfer tubes 2a and the other set of heat transfer tubes 2a. Is shown.
[0016]
As shown in FIG. 2, the inlet header 4 and the outlet header 5 adopt a two-piece connection method in which a plurality of heat transfer tubes 2a in two rows are connected vertically, and are indicated by black circles. Between the adjacent ones of the portions connected to the headers 4 and 5 of the one set of heat transfer tubes 2 a, the other set of heat transfer tubes 2 a is arranged, so that they are connected to the headers 4 and 5. The space between the heat transfer tubes 2a is widened.
[0017]
Therefore, in the inlet header 4 and the outlet header 5, connection work by welding of the heat transfer tubes 2a can be easily performed, and the horizontal dimension L of the header storage section 3 and the vertical dimension between both headers. H can be reduced and the dimensions of the headers 4 and 5 can also be reduced. Thereby, in the present embodiment, the entire exhaust gas boiler 1 can be reduced in size.
[0018]
Further, in this embodiment, in each header 4, 5 in which two heat transfer tubes are connected, the number of connected heat transfer tubes 2a is reduced. Since it is provided with a set, it is possible to set the flow rate in the pipe that each heat transfer pipe 2a takes within the planned condition, and it is possible to achieve a predetermined performance while suppressing the pressure loss in the pipe.
[0019]
A second embodiment of the present invention will be described with reference to FIG. This embodiment corresponds to the arrangement of the eight-headed header of a conventional gas-fired exhaust gas boiler, with two on each side of the gas flow, and two vertically located positions. Displaced inlet header 4 and outlet header 5 located above and displaced vertically are arranged so that corresponding ones on both sides of the gas flow are at the same height, A plurality of heat transfer tubes 2a in two rows are connected to each of the header 4 and the outlet header 5 in a two-piece manner. Therefore, in this embodiment, two sets are formed on each of the left side and the right side in FIG. 3, and a total of four sets of the inlet header 4, the outlet header 5, and the heat transfer tube group 2 are configured. As in the above, the other set of heat transfer tubes 2a is arranged between the upper and lower adjacent heat transfer tubes 2a. Further, in this embodiment, as shown in FIG. 3, the heat transfer tube 2 a is curved once in a U shape within the header housing 3 on the other side of the gas flow, and on each side of the gas flow, The other end of the heat transfer tube 2a, one end of which is connected to the lowermost inlet header 4, is connected to the uppermost outlet header 5, and one end is connected to the intermediate inlet header 4 in the vertical direction. The other end of the heat transfer tube 2a to which the portion is connected is connected to the outlet header 5 in the middle in the vertical direction.
[0020]
Also in the present embodiment, the overall size of the exhaust gas boiler 1 can be reduced by reducing the dimensions L and H as in the first embodiment.
[0021]
【The invention's effect】
The present invention relates to a gas-fired exhaust gas boiler, in which two heat transfer tubes are connected to the inlet header and the outlet header, and the other set of heat transfer tubes is connected between the upper and lower adjacent heat transfer tubes. to have arranged the heat pipe, decline the vertical dimension between the horizontal dimension and the inlet pipe pulling and outlet pipe pulling of the tube pulling housing portion of the exhaust gas boiler in comparison with the conventional gas vertical flow type exhaust gas boiler The entire exhaust gas boiler can be made compact.
[Brief description of the drawings]
FIG. 1 is an elevation view of a main part of a first embodiment of the present invention.
FIG. 2 is an explanatory view showing an arrangement of heat transfer tubes in a connection portion to the header of the first embodiment.
FIG. 3 is an elevational view of a main part of a second embodiment of the present invention.
FIG. 4 is a longitudinal sectional view showing a configuration of an example of a conventional gas-fired exhaust gas boiler.
FIG. 5 is an elevation view of a main part of the conventional gas-fired exhaust gas boiler.
FIG. 6 is an explanatory view showing the arrangement of heat transfer tubes at the connection portion to the header of the conventional gas-fired exhaust gas boiler.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Exhaust gas boiler 2 Heat transfer tube group 2a Heat transfer tube 3 Heading storage part 4 Inlet heading 5 Outlet heading 6 Gas guide plate

Claims (1)

上下に間隔をおいて配置された入口管寄せと出口管寄せに両端部が接続されガス流れを横切って配置された複数の伝熱管によって構成される伝熱管群を備えたガス竪流れ型排ガスボイラにおいて、入口管寄せと出口管寄せのそれぞれに伝熱管を2本取りに接続し、左右の一方の組の上下に隣接する伝熱管の間に他方の組の伝熱管を配置したことを特徴とするガス竪流れ型排ガスボイラ。A gas-fired exhaust gas boiler having a heat transfer tube group composed of a plurality of heat transfer tubes connected at both ends to an inlet header and an outlet header arranged at intervals in the vertical direction and arranged across the gas flow In the present invention, two heat transfer tubes are connected to each of the inlet header and the outlet header, and the other set of heat transfer tubes is disposed between the upper and lower adjacent heat transfer tubes. Gas fired flow type exhaust gas boiler.
JP27949293A 1993-11-09 1993-11-09 Gas fired exhaust gas boiler Expired - Lifetime JP3621711B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27949293A JP3621711B2 (en) 1993-11-09 1993-11-09 Gas fired exhaust gas boiler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27949293A JP3621711B2 (en) 1993-11-09 1993-11-09 Gas fired exhaust gas boiler

Publications (2)

Publication Number Publication Date
JPH07133902A JPH07133902A (en) 1995-05-23
JP3621711B2 true JP3621711B2 (en) 2005-02-16

Family

ID=17611806

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27949293A Expired - Lifetime JP3621711B2 (en) 1993-11-09 1993-11-09 Gas fired exhaust gas boiler

Country Status (1)

Country Link
JP (1) JP3621711B2 (en)

Also Published As

Publication number Publication date
JPH07133902A (en) 1995-05-23

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