JPH08562Y2

JPH08562Y2 - Multi-tube once-through boiler

Info

Publication number: JPH08562Y2
Application number: JP8799690U
Authority: JP
Inventors: 洋一野村
Original assignee: 株式会社サムソン
Priority date: 1990-08-24
Filing date: 1990-08-24
Publication date: 1996-01-10
Anticipated expiration: 2005-08-24
Also published as: JPH0449703U

Description

【考案の詳細な説明】（産業上の利用分野）本考案は内側水管と外側水管のボイド率の相違を減少
させ、水位制御を容易にした多管式貫流ボイラの構造に
関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a structure of a multi-tube once-through boiler in which the difference in void ratio between the inner water pipe and the outer water pipe is reduced and the water level is easily controlled.

（従来の技術とその問題点）多管式貫流ボイラでは内側水管と外側水管の伝熱量の
相違により、内側水管と外側水管のボイド率が大きく異
なり、内側水管と外側水管では水の到達する位置が異な
るので、適正な運転水位の設定が難しい。運転水位を高
く設定すると、内側水管の水位が上昇し、蒸気に水分が
含まれ、発生蒸気質が低下するばかりでなく、循環比が
大きくなり循環比が２以上になると貫流ボイラの規定か
ら外れてしまう。また運転水位を低く設定すると、外側
水管上部へ水が達しないため過熱状態となり、缶体の寿
命が短くなる。そのため、内側水管と外側水管とのボイ
ド率の相違が大きくなる程、運転水位の適切な設定は難
しくなる。(Conventional technology and its problems) In a multi-tube once-through boiler, the void rate of the inner water pipe and the outer water pipe is significantly different due to the difference in heat transfer amount between the inner water pipe and the outer water pipe, and the water arrival position in the inner water pipe and the outer water pipe. However, it is difficult to set the proper operating water level. When the operating water level is set high, the water level in the inner water pipe rises, the steam contains water, and the generated steam quality deteriorates. In addition, when the circulation ratio increases and the circulation ratio becomes 2 or more, the once-through boiler is out of regulation. Will end up. Also, if the operating water level is set low, the water will not reach the upper part of the outer water pipe, resulting in overheating and shortening the life of the can body. Therefore, as the difference in void ratio between the inner water pipe and the outer water pipe increases, it becomes more difficult to appropriately set the operating water level.

（問題点を解決するための手段）本考案は上記の問題点を解決するために、外側水管の
管口径を小さくし、ヒレを外側に設けることにより、外
側水管におけるボイド率を向上させて、外側水管と内側
水管のボイド率の相違を低減させる。(Means for Solving Problems) In order to solve the above problems, the present invention improves the void ratio in the outer water pipe by reducing the diameter of the outer water pipe and providing a fin on the outside. The difference in void ratio between the outer water pipe and the inner water pipe is reduced.

（実施例）本考案の実施例を図面を用いて説明する。環状に形成
した上部管寄せ１と下部管寄せ２の間に内側水管３と外
側水管４をそれぞれ同心円周上に立設して、内側水管３
をそれぞれヒレ５により連結して内側水管壁を形成し、
外側水管４をそれぞれヒレにより連結して外側水管壁を
形成させた。外側水管の管径を内側水管のものより小さ
くして、管外径が減少した分に見合うだけ、ヒレ６を外
側水管の外側に設置した。内側水管壁の内側に燃焼室７
を形成し、内側水管の開口部９より、内側水管壁と外側
水管壁の間の燃焼ガスのガス通路８を通り、外側水管の
開口部10へと燃焼ガス通路を形成する。この時、外側水
管の内容積に対しての伝熱量は、第２図のもの（従来の
もの）より増加して外側水管のボイド率は増加する。(Example) The Example of this invention is described using drawing. An inner water pipe 3 and an outer water pipe 4 are erected on concentric circles between an upper pipe header 1 and a lower pipe header 2 which are formed in an annular shape, respectively.
To form inner water pipe wall by connecting fins 5,
The outer water pipes 4 were connected by fins to form outer water pipe walls. The diameter of the outer water pipe was made smaller than that of the inner water pipe, and the fins 6 were installed outside the outer water pipe as much as the outer diameter of the water pipe was reduced. Combustion chamber 7 inside the inner water tube wall
From the opening 9 of the inner water pipe, through the gas passage 8 of the combustion gas between the inner water pipe wall and the outer water pipe wall, to form the combustion gas passage to the opening 10 of the outer water pipe. At this time, the amount of heat transferred to the inner volume of the outer water pipe is larger than that in FIG. 2 (conventional one), and the void ratio of the outer water pipe is increased.

（効果）本考案の実施により、内側水管と外側水管のボイド率
の相違の低減により、適正の運転水位の範囲が大きくと
れることにより水位制御が容易になった。(Effect) By implementing the present invention, the difference in the void ratio between the inner water pipe and the outer water pipe is reduced, and the range of the appropriate operating water level can be widened, thereby facilitating the water level control.

[Brief description of drawings]

第１図は本考案の実施例の縦断面図である。第２図は従
来ボイラの場合の第１図のＡ−Ａに該当する断面図であ
る。第３図は第１図のＡ−Ａ断面図である。１……上部管寄せ、２……下部管寄せ３……内側水管、４……外側水管５……内側水管のヒレ、６……外側水管のヒレ７……燃焼室８……燃焼ガスのガス通路FIG. 1 is a vertical sectional view of an embodiment of the present invention. FIG. 2 is a sectional view corresponding to AA of FIG. 1 in the case of a conventional boiler. FIG. 3 is a sectional view taken along line AA of FIG. 1 ... Upper heading 2 ... Lower heading 3 ... Inner water pipe 4 ... Outer water pipe 5 ... Inner water pipe fin, 6 ... Outer water pipe fin 7 ... Combustion chamber 8 ... Combustion gas Gas passage

Claims

[Scope of utility model registration request]

A water pipe is erected concentrically on the inside and the outside between an upper pipe header 1 and a lower pipe header 2, which are formed in an annular shape, and inner water pipes 3 are connected by fins 5, respectively. A pipe wall is formed, the outer water pipes 4 are connected by fins 6 respectively to form an outer water pipe wall, a combustion chamber 7 is formed inside the inner water pipe wall, and an inner water pipe wall is formed from an inner water pipe opening 9. In a multi-tube type once-through boiler in which a combustion gas passage is formed through the combustion gas passage 8 between the outer water pipe wall and the outer water pipe wall, the outer water pipe 4 has a smaller diameter than the inner water pipe. A structure of a multi-tube once-through boiler, characterized in that fins are attached to the outside of the outer water pipe so that the heat transfer area of the water pipe 4 is the same as before the diameter was reduced.