JPH0463282B2 - - Google Patents
Info
- Publication number
- JPH0463282B2 JPH0463282B2 JP16007785A JP16007785A JPH0463282B2 JP H0463282 B2 JPH0463282 B2 JP H0463282B2 JP 16007785 A JP16007785 A JP 16007785A JP 16007785 A JP16007785 A JP 16007785A JP H0463282 B2 JPH0463282 B2 JP H0463282B2
- Authority
- JP
- Japan
- Prior art keywords
- wall
- steam
- water
- cooled wall
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000007921 spray Substances 0.000 claims description 21
- 239000002184 metal Substances 0.000 claims description 19
- 229910052751 metal Inorganic materials 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 238000001816 cooling Methods 0.000 description 22
- 239000012530 fluid Substances 0.000 description 16
- 238000010586 diagram Methods 0.000 description 6
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 230000008646 thermal stress Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
Landscapes
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、蒸気発生装置、特に圧力が負荷に応
じて変化する変圧運転ボイラに関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a steam generator, and particularly to a variable pressure boiler in which the pressure changes depending on the load.
従来の技術
従来のボイラでは、一般に、その火炉周壁の少
なくとも側壁を蒸発管で構成した水冷壁構造と
し、また火炉に接続される後部煙道の周壁の少な
くとも側壁を蒸冷壁（蒸気冷却壁）で構成し、こ
れら火炉水冷壁と後部煙道蒸冷壁とをフイン等を
使用して溶接により接合している。BACKGROUND ART Conventional boilers generally have a water-cooled wall structure in which at least the side wall of the furnace peripheral wall is composed of evaporation tubes, and at least the side wall of the peripheral wall of the rear flue connected to the furnace is a steam-cooled wall (steam cooling wall). The furnace water-cooled wall and the rear flue steam-cooled wall are joined by welding using fins or the like.
発明が解決しようとする問題点
しかして、このようなボイラにおいては、第５
図及び第６図に示すように、火炉水冷壁と後部煙
道蒸冷壁との蓄熱容量及び加熱条件等の相違によ
り、ボイラ負荷変化時、両者の温度変化速度が異
なり、特に負荷降下時に水冷壁出口流体の温度と
蒸冷壁出口流体（蒸気）の温度、又は水冷壁と蒸
冷壁の各壁管の平均メタル温度に差が生じる。Problems to be solved by the invention However, in such a boiler, the fifth
As shown in Fig. 6 and Fig. 6, due to differences in heat storage capacity and heating conditions between the water-cooled wall of the furnace and the steam-cooled wall of the rear flue, the rate of temperature change between the two is different when the boiler load changes. A difference occurs between the temperature of the wall outlet fluid and the temperature of the vapor-cooled wall outlet fluid (steam), or the average metal temperature of each wall tube of the water-cooled wall and the vapor-cooled wall.
特に、変圧運転ボイラでは、その特有の現象、
即ち負荷降下時は飽和温度が負荷と共に低下する
ため、メタルの保有熱量差の分だけ先行して燃料
を絞る（アンダーフアイアリング）ので、水冷壁
流体温度及び水冷壁メタル温度は負荷変化に応じ
て急速に変化する。これに対し、蒸冷壁は、管内
流体の状態変化に対する追従が遅く、ガス流れの
後流側に位置する後部煙道にあるため、アンダー
フアイアリングの影響（熱負荷低下）が遅れ、ま
た入口連絡管、蒸冷壁管等のメタルの保有熱の影
響を受け、蒸冷壁メタル温度は水冷壁メタル温度
の変化に対し遅れが生じる。この結果、水冷壁と
蒸冷壁との熱膨張に大きな差異が生ずる。 In particular, in variable voltage operation boilers, the peculiar phenomenon,
In other words, when the load drops, the saturation temperature decreases with the load, so the fuel is throttled in advance by the difference in heat capacity of the metal (underfire), so the water-cooled wall fluid temperature and the water-cooled wall metal temperature change in accordance with the load change. Change rapidly. On the other hand, the steam-cooled wall is slow to follow changes in the state of the fluid inside the pipe, and because it is located in the rear flue on the downstream side of the gas flow, the effect of underfiring (reduction in heat load) is delayed, and the inlet Affected by the heat retained in metals such as connecting pipes and steam-cooled wall pipes, the steam-cooled wall metal temperature lags behind changes in the water-cooled wall metal temperature. This results in a large difference in thermal expansion between the water-cooled wall and the steam-cooled wall.
従つて、火炉水冷壁と後部煙道蒸冷壁とをフイ
ン等を使用して溶接により接合している場合に
は、熱膨張差により発生した応力がこの接合部特
にフイン端部に発生し、このためフインが損傷す
ることがある。 Therefore, when the water-cooled wall of the furnace and the steam-cooled wall of the rear flue are joined by welding using fins, etc., stress due to the difference in thermal expansion occurs at this joint, especially at the ends of the fins. This may cause damage to the fins.
そこで、本発明は、火炉水冷壁と後部煙道蒸冷
壁との接合部に発生する熱応力を低減して、その
接合部の損傷を防止することを目的とする。 SUMMARY OF THE INVENTION Therefore, an object of the present invention is to reduce the thermal stress generated at the joint between the water-cooled wall of the furnace and the steam-cooled wall of the rear flue, and to prevent damage to the joint.
問題点を解決するための手段
本発明は、火炉周壁の少なくとも側壁が水冷壁
で構成され、またこの水冷壁に接合されている後
部煙道周壁の少なくとも側部が蒸冷壁で構成され
ている蒸気発生装置において、蒸冷壁入口連絡管
の途中に過熱低減器で配置するとともにこの過熱
低減器にスプレイ水を供給するスプレイ水供給管
を連結し、このスプレイ水供給管の途中に水冷壁
出口の流体と蒸冷壁出口の流体との温度差又は水
冷壁出口近傍と蒸冷壁出口近傍とのメタルの温度
差により開度がコントロールされるスプレイ制御
弁を設けたものである。Means for Solving the Problems In the present invention, at least the side wall of the furnace peripheral wall is constituted by a water-cooled wall, and at least the side part of the rear flue peripheral wall joined to the water-cooled wall is constituted by a steam-cooled wall. In a steam generator, a superheat reducer is placed in the middle of the steam cooling wall inlet communication pipe, and a spray water supply pipe that supplies spray water is connected to this superheat reducer, and a water cooling wall outlet is placed in the middle of this spray water supply pipe. The spray control valve is provided with a spray control valve whose opening degree is controlled by the temperature difference between the fluid at the outlet of the steam cooling wall and the fluid at the outlet of the steam cooling wall, or by the temperature difference between the metal near the outlet of the water cooling wall and the vicinity of the outlet of the steam cooling wall.
作 用
このような手段によれば、スプレイ制御弁によ
るスプレイ制御によつて、負荷変化時には、蒸冷
壁出口流体温度と水冷壁出口流体温度との差又は
蒸冷壁メタル温度と水冷壁メタル温度との差が一
定の温度以下となるよう制御することにより、過
大な温度差発生、従つて熱応力の発生を防止する
ことができる。According to such a means, when the load changes, the difference between the steam cooling wall outlet fluid temperature and the water cooling wall outlet fluid temperature or the steam cooling wall metal temperature and the water cooling wall metal temperature is controlled by the spray control by the spray control valve. By controlling the difference so that the difference is below a certain temperature, it is possible to prevent the generation of an excessive temperature difference and therefore the generation of thermal stress.
実施例
以下図面を参照して本発明の実施例について詳
述する。Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
第１図及び第２図において、１は火炉周壁を構
成する水冷壁、２は後部煙道周壁を構成する蒸冷
壁、３は水冷壁入口連絡管、４は水冷壁出口連絡
管、５は気水分離器又はドラム、６は蒸冷壁入口
連絡管、７は過熱低減器、８は蒸冷壁入口分配
管、９は蒸冷壁入口管寄せ、１０は蒸冷壁出口連
絡管である。 In Figures 1 and 2, 1 is a water-cooled wall forming the furnace peripheral wall, 2 is a steam-cooled wall forming the rear flue surrounding wall, 3 is a water-cooled wall inlet connecting pipe, 4 is a water-cooled wall outlet connecting pipe, and 5 is a water-cooled wall that forms the peripheral wall of the furnace. Steam/water separator or drum, 6 is a steam cooling wall inlet connecting pipe, 7 is a superheat reducer, 8 is a steam cooling wall inlet distribution pipe, 9 is a steam cooling wall inlet header, 10 is a steam cooling wall outlet connecting pipe .
しかして、蒸冷壁入口連絡管６の途中に配置さ
れている過熱低減器７にはスプレイ水を供給する
スプレイ水供給管１１が連結され、この管１１の
途中には温度差制御器１２により開度がコントロ
ールされるスプレイ制御弁１３が設けられてい
る。 A spray water supply pipe 11 for supplying spray water is connected to the superheat reducer 7 disposed in the middle of the steam-cooled wall inlet communication pipe 6, and a temperature difference controller 12 is connected in the middle of this pipe 11. A spray control valve 13 whose opening degree is controlled is provided.
かかる温度差制御器１２は、第１図では、水冷
壁出口連絡管４を流れる流体と蒸冷壁出口連絡管
１０を流れる流体との温度差を検出してスプレイ
制御弁１３の開度をコントロールするようにされ
ており、これら流体の温度はそれぞれ温度検出器
１４ａ，１４ｂにより検出されるようになつてい
る。 In FIG. 1, the temperature difference controller 12 detects the temperature difference between the fluid flowing through the water-cooled wall outlet connecting pipe 4 and the fluid flowing through the steam-cooled wall outlet connecting pipe 10 to control the opening degree of the spray control valve 13. The temperatures of these fluids are detected by temperature detectors 14a and 14b, respectively.
また、第２図では、温度差制御器１２は、水冷
壁１の出口近傍におけるメタルと蒸冷壁２の出口
近傍におけるメタルとの温度差を検出してスプレ
イ制御弁１３の開度をコントロールするようにさ
れており、これらメタルの温度はそれぞれ複数の
温度検出素子１４c′，１４d′を有する温度検出器
１４ｃ，１４ｄにより検出されるようになつてい
る。 Further, in FIG. 2, the temperature difference controller 12 detects the temperature difference between the metal near the outlet of the water-cooled wall 1 and the metal near the outlet of the steam-cooled wall 2, and controls the opening degree of the spray control valve 13. The temperature of these metals is detected by temperature detectors 14c and 14d each having a plurality of temperature detection elements 14c' and 14d'.
しかして、負荷変化時には、第３図及び第４図
に示すように、水冷壁出口流体温度と蒸冷壁出口
流体温度との差、又は水冷壁メタル温度と蒸冷壁
メタル温度との差が水冷壁と蒸冷壁との接合部に
大きな熱応力を生じさせることのないような一定
の温度以下となるように、スプレイ制御弁１３に
よつて過熱低減器７へのスプレイ水供給量が制御
される。 Therefore, when the load changes, as shown in Figures 3 and 4, the difference between the fluid temperature at the outlet of the water-cooled wall and the fluid temperature at the outlet of the steam-cooled wall, or the difference between the temperature of the water-cooled wall metal and the steam-cooled wall metal temperature increases. The amount of spray water supplied to the attenuator 7 is controlled by the spray control valve 13 so that the temperature is below a certain level without causing large thermal stress at the joint between the water-cooled wall and the steam-cooled wall. be done.
発明の効果
以上詳述したように、本発明によれば、スプレ
イ制御弁による給水のスプレイ量制御により、火
炉水冷壁と後部煙道蒸冷壁との接合部に過大な熱
応力が発生するのを防止し、これによりこの接合
部特にその溶接フインが損傷するのを確実に防止
することができる。Effects of the Invention As detailed above, according to the present invention, excessive thermal stress is prevented from being generated at the joint between the furnace water-cooled wall and the rear flue steam-cooled wall by controlling the spray amount of water supply using the spray control valve. This makes it possible to reliably prevent damage to the joint, particularly the weld fin.
第１図は本発明による蒸気発生装置の一例を示
す系統図、第２図はその変形例を示す図、第３図
は負荷変化時における本発明による給水スプレイ
制御による水冷壁出口流体温度と蒸冷壁出口流体
温度との変化を示す図、第４図は同様に水冷壁メ
タル温度と蒸冷壁メタル温度との変化を示す図、
第５図は負荷降下時における従来の水冷壁出口流
体温度と蒸冷壁出口流体温度との変化を示す図、
第６図は同様に水冷壁メタル温度と蒸冷壁メタル
温度との変化を示す図である。
１……火炉水冷壁、２……後部煙道蒸冷壁、４
……水冷壁出口連絡管、６……蒸冷壁入口連絡
管、７……過熱低減器、１０……蒸冷壁出口連絡
管、１１……スプレイ水供給管、１２……温度差
制御器、１３……スプレイ制御弁、１４ａ〜１４
ｄ……温度検出器。
FIG. 1 is a system diagram showing an example of the steam generator according to the present invention, FIG. 2 is a diagram showing a modification thereof, and FIG. FIG. 4 is a diagram showing changes in cold wall outlet fluid temperature, and FIG. 4 is a diagram similarly showing changes in water cooling wall metal temperature and steam cooling wall metal temperature.
FIG. 5 is a diagram showing changes in the conventional water-cooled wall outlet fluid temperature and steam-cooled wall outlet fluid temperature when the load decreases;
FIG. 6 is a diagram similarly showing changes in water-cooled wall metal temperature and steam-cooled wall metal temperature. 1... Furnace water cooling wall, 2... Rear flue steam cooling wall, 4
... Water cooling wall outlet connection pipe, 6 ... Steam cooling wall inlet connection pipe, 7 ... Superheat reducer, 10 ... Steam cooling wall outlet connection pipe, 11 ... Spray water supply pipe, 12 ... Temperature difference controller , 13... spray control valve, 14a-14
d...Temperature detector.
Claims (1)
れ、またこの水冷壁に接合されている後部煙道周
壁の少なくとも側部が蒸冷壁で構成されている蒸
気発生装置において、蒸冷壁入口連絡管の途中に
過熱低減器で配置するとともにこの過熱低減器に
スプレイ水を供給するスプレイ水供給管を連結
し、このスプレイ水供給管の途中に水冷壁出口の
流体と蒸冷壁出口の流体との温度差又は水冷壁出
口近傍と蒸冷壁出口近傍とのメタルの温度差によ
り開度がコントロールされるスプレイ制御弁を設
けてなる蒸気発生装置。1. In a steam generator in which at least the side wall of the furnace peripheral wall is constituted by a water-cooled wall, and at least the side part of the rear flue peripheral wall joined to the water-cooled wall is constituted by a steam-cooled wall, the steam-cooled wall inlet connecting pipe A desuperheater is placed in the middle of the desuperheater, and a spray water supply pipe that supplies spray water to the desuperheater is connected. A steam generator equipped with a spray control valve whose opening degree is controlled by the temperature difference or the difference in metal temperature between the vicinity of the outlet of the water-cooled wall and the vicinity of the outlet of the steam-cooled wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16007785A JPS6222902A (en) | 1985-07-22 | 1985-07-22 | Steam generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16007785A JPS6222902A (en) | 1985-07-22 | 1985-07-22 | Steam generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6222902A JPS6222902A (en) | 1987-01-31 |
| JPH0463282B2 true JPH0463282B2 (en) | 1992-10-09 |
Family
ID=15707373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16007785A Granted JPS6222902A (en) | 1985-07-22 | 1985-07-22 | Steam generator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6222902A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0757669B2 (en) * | 1988-02-16 | 1995-06-21 | 日立電線株式会社 | Winding control method for tsuba spread bobbin |
| JPH0768006B2 (en) * | 1988-02-17 | 1995-07-26 | 日立電線株式会社 | Automatic control winding method for filament |
| BRPI0618509A2 (en) * | 2005-11-11 | 2011-09-06 | Burford Corp | tape closure for securing the neck of a bag with an adhesive film and a non-adhesive holder |
-
1985
- 1985-07-22 JP JP16007785A patent/JPS6222902A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6222902A (en) | 1987-01-31 |
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