JPH06184652A - Furnace pressure control method - Google Patents
Furnace pressure control methodInfo
- Publication number
- JPH06184652A JPH06184652A JP35534392A JP35534392A JPH06184652A JP H06184652 A JPH06184652 A JP H06184652A JP 35534392 A JP35534392 A JP 35534392A JP 35534392 A JP35534392 A JP 35534392A JP H06184652 A JPH06184652 A JP H06184652A
- Authority
- JP
- Japan
- Prior art keywords
- furnace pressure
- furnace
- fan
- dumper
- induction fan
- 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.)
- Withdrawn
Links
Landscapes
- Control Of Heat Treatment Processes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は加熱炉等の工業炉の炉圧
制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a furnace pressure control method for an industrial furnace such as a heating furnace.
【０００２】[0002]
【従来の技術】工業炉の炉圧は、過大であると、炉体
に過大応力が作用してその寿命を短くする他、炉内エネ
ルギ（炎等）が炉開口部から外部に噴出してエネルギ損
失を大とし、過小であると、大気が炉開口部から炉内
に侵入して炉内雰囲気を冷却し、燃料消費量を徒らに大
ならしめる。従って、炉圧は、適性値に制御することが
必要である。2. Description of the Related Art If the furnace pressure of an industrial furnace is too high, excessive stress acts on the furnace body to shorten its life, and energy in the furnace (flame, etc.) is ejected from the furnace opening to the outside. If the energy loss is large and is too small, the atmosphere penetrates into the furnace through the opening of the furnace and cools the atmosphere in the furnace, which unnecessarily increases the fuel consumption. Therefore, it is necessary to control the furnace pressure to an appropriate value.
【０００３】然るに、従来の炉圧制御方法は、炉の排ガ
スを誘引ファンで誘引して排出することにより、炉圧を
制御するものとしている。そして、誘引ファンを一定回
転数にて運転するとともに、誘引ファンの上流側に煙道
ダンパを設け、炉の燃焼量、即ち排ガスの発生量に応じ
て、ダンパの開度を変更することにより、炉圧を制御し
ている。However, in the conventional furnace pressure control method, the furnace pressure is controlled by inducing the exhaust gas of the furnace by the induction fan and discharging it. Then, while operating the induction fan at a constant rotation speed, a flue damper is provided on the upstream side of the induction fan, and the combustion amount of the furnace, that is, by changing the opening degree of the damper according to the amount of exhaust gas generated, The furnace pressure is controlled.
【０００４】然しながら、上述の方法では、ダンパにて
大きな圧力損失を生じ、エネルギロスとなる。また、広
い範囲の燃焼量をもつ炉の場合、誘引ファンのモーター
容量を最大燃焼量に合わせて決定するため、低負荷燃焼
時には、ダンパを全閉しても、過剰な排ガスドラフト力
（排ガス誘引力）を生じ、炉圧を安定維持できない。However, in the above method, a large pressure loss occurs in the damper, resulting in energy loss. In addition, in the case of a furnace with a wide range of combustion amount, the motor capacity of the induction fan is determined according to the maximum combustion amount, so at low load combustion, even if the damper is fully closed, the excess exhaust gas draft force (exhaust gas induction Force) and cannot keep the furnace pressure stable.
【０００５】そこで従来の炉圧制御方法において、煙道
ダンパによるエネルギロスを回避するため、特開昭56-1
00227 号公報、特開昭59-177329 号公報に記載のものが
提案されている。これらの従来技術は、誘引ファンの回
転数を燃焼量に応じて増減するものである。特開昭56-1
00227 号公報では、ファン回転数の増減を連続的に行な
い、特開昭59-177329 号公報では、ファン回転数の増減
を段階的に行なう。Therefore, in the conventional furnace pressure control method, in order to avoid energy loss due to the flue damper, Japanese Patent Laid-Open No. 56-1
The ones described in 00227 and JP-A-59-177329 have been proposed. These conventional techniques increase or decrease the rotation speed of the induction fan according to the combustion amount. JP 56-1
In 00227, the fan rotation speed is continuously increased and decreased, and in JP-A-59-177329, the fan rotation speed is increased and decreased stepwise.
【０００６】[0006]
【発明が解決しようとする課題】然しながら、特開昭56
-100227 号公報においては、誘引ファンの回転数の可変
範囲に限界があるため、燃焼負荷範囲の広い炉で実施し
た場合、ファン最大回転数を最大燃焼量に合わせて設定
すると、ファン回転数を下限回転数まで低減しても尚過
剰な排ガスドラフト力を生ずることがあり、炉圧を安定
維持できない。However, Japanese Patent Laid-Open No. Sho 56-56
In the -100227 publication, there is a limit to the variable range of the rotation speed of the induction fan. Therefore, when the maximum rotation speed of the fan is set according to the maximum combustion amount when the furnace is used with a wide combustion load range, the rotation speed of the fan is reduced. Even if it is reduced to the lower limit rotation speed, an excessive exhaust gas draft force may still be generated, and the furnace pressure cannot be stably maintained.
【０００７】また、特開昭59-177329 号公報において
は、ファン回数を段階的に増減させるものであるため、
煙道ダンパの常時介入が避けられず、エネルギロスを回
避できない。Further, in JP-A-59-177329, since the number of fans is increased / decreased stepwise,
The constant intervention of the flue damper is inevitable and energy loss cannot be avoided.
【０００８】本発明は、煙道ダンパの常時介入によるエ
ネルギロスを回避し、かつ炉圧を安定制御することを目
的とする。An object of the present invention is to avoid energy loss due to the constant intervention of the flue damper and to stably control the furnace pressure.
【０００９】[0009]
【課題を解決するための手段】本発明は、炉の排ガスを
誘引ファンで誘引して排出することにより、炉圧を制御
する炉圧制御方法において、低負荷燃焼時には、誘引フ
ァンを下限回転数にて運転するとともに、煙道ダンパを
開閉することにて炉圧制御し、通常燃焼時には、煙道ダ
ンパを全開とするとともに、誘引ファンの回転数を連続
的に増減することにて炉圧制御するようにしたものであ
る。According to the present invention, in a furnace pressure control method for controlling furnace pressure by inducing and discharging exhaust gas from a furnace with an induction fan, the induction fan has a lower limit rotation speed during low load combustion. The furnace pressure is controlled by opening and closing the flue damper, and during normal combustion, the flue damper is fully opened and the rotation speed of the induction fan is continuously increased or decreased to control the furnace pressure. It is something that is done.
【００１０】[0010]
【作用】 通常燃焼時に、煙道ダンパは完全に全開を維持するも
のとなり、煙道ダンパの常時介入によるエネルギロスを
回避できる。[Operation] During normal combustion, the flue damper is kept fully open, and energy loss due to constant intervention of the flue damper can be avoided.
【００１１】通常燃焼時には、誘引ファンの回転数の
連続的な増減により炉圧を高精度で制御できる。また、
誘引ファンの回転数が下限に到達した低負荷燃焼時に
は、煙道ダンパの介入により、排ガスドラフト力を制御
し、炉圧を高精度に制御できる。即ち、高範囲の燃焼に
対し、炉圧を安定制御できる。During normal combustion, the furnace pressure can be controlled with high accuracy by continuously increasing or decreasing the number of revolutions of the induction fan. Also,
During low load combustion when the induction fan speed reaches the lower limit, the exhaust gas draft force can be controlled and the furnace pressure can be controlled with high accuracy by the intervention of the flue damper. That is, the furnace pressure can be controlled stably for a high range of combustion.
【００１２】[0012]
【実施例】図１は本発明の一実施例を示す模式図、図２
は本発明の具体的実施例を示す模式図である。1 is a schematic view showing an embodiment of the present invention, FIG.
FIG. 3 is a schematic view showing a specific example of the present invention.
【００１３】図１（Ａ）の炉圧制御装置１０において、
１１は炉、１２は煙道、１３は煙突、１４は炉圧検出
器、１５は炉圧指示調節計、１６は誘引ファン、１７は
煙道ダンパである。In the furnace pressure control device 10 of FIG. 1 (A),
11 is a furnace, 12 is a flue, 13 is a chimney, 14 is a furnace pressure detector, 15 is a furnace pressure indicating controller, 16 is an induction fan, and 17 is a flue damper.
【００１４】炉圧指示調節計１５は、炉圧検出器１４が
検出した炉１１の炉圧実績値Ｐx を炉圧設定値Ｐy （図
１（Ｃ））に比較し、炉圧実績値Ｐx が炉圧設定値Ｐｙ
に一値するように、炉１１の排ガスを誘引ファン１６で
誘引して排出する。The furnace pressure indicating controller 15 compares the actual furnace pressure value Px of the furnace 11 detected by the furnace pressure detector 14 with the preset furnace pressure value Py (FIG. 1 (C)) and determines that the actual furnace pressure value Px is Furnace pressure set value Py
The exhaust gas of the furnace 11 is attracted by the attracting fan 16 and is discharged so that the value is equal to
【００１５】このとき、炉圧指示調節計１５は、(A) 低
負荷燃焼時には、誘引ファン１６を下限回転数Ｎ0 にて
運転するとともに、煙道ダンパ１７を開閉する（図１
（Ｂ）のＡゾーン）。また、炉圧指示調節計１５は、
(B) 通常燃焼時には、煙道ダンパ１７を全開（Ｗf ）と
するとともに、誘引ファン１６の回転数を連続的に増減
する（図１（Ｂ）のＢゾーン）。尚、誘引ファン１６の
上限回転数は、最大燃焼時の排ガス量に適合し得るよう
に設定される。At this time, the furnace pressure indicating controller 15 operates the induction fan 16 at the lower limit rotation speed N0 and opens and closes the flue damper 17 (A) during low load combustion (see FIG. 1).
(A zone in (B)). Further, the furnace pressure indicating controller 15 is
(B) During normal combustion, the flue damper 17 is fully opened (Wf) and the rotation speed of the induction fan 16 is continuously increased / decreased (B zone in FIG. 1 (B)). The upper limit rotation speed of the induction fan 16 is set so as to be compatible with the exhaust gas amount at the time of maximum combustion.
【００１６】以下、炉圧指示調節計１５による炉圧制御
内容について説明する。The details of the furnace pressure control by the furnace pressure indicating controller 15 will be described below.
【００１７】(1) 炉１１の最適炉圧は、燃焼負荷に応じ
て図１（Ｃ）に示すような線図（設定値Ｐy ）で与えら
れる。そこで、炉圧指示調節計１５は、炉圧検出器１４
で得た炉圧実績値Ｐx を炉圧設定値Ｐy と比較し、炉圧
実績値Ｐx が炉圧設定値Ｐyに一値するように、誘引フ
ァン１６、煙道ダンパ１７に制御信号を出力する。(1) The optimum furnace pressure of the furnace 11 is given by a diagram (set value Py) as shown in FIG. 1 (C) according to the combustion load. Therefore, the furnace pressure indicating controller 15 includes the furnace pressure detector 14
The actual furnace pressure value Px obtained in step 1 is compared with the furnace pressure set value Py, and a control signal is output to the induction fan 16 and the flue damper 17 so that the actual furnace pressure value Px is equal to the furnace pressure set value Py.
【００１８】(2) 炉圧指示調節計１５は、炉圧実績値Ｐ
x が炉圧設定値Ｐy より大きい場合には、図１（Ｂ）に
おいて燃焼量大の方向へと移行させ、炉圧実績値Ｐx が
炉圧設定値Ｐy よりも小さい場合には、図１（Ｂ）にお
いて燃焼量小の方向へと移行させる。(2) The furnace pressure indicating controller 15 has a furnace pressure actual value P
When x is larger than the furnace pressure set value Py, the combustion amount is shifted to a larger amount in FIG. 1 (B), and when the furnace pressure actual value Px is smaller than the furnace pressure set value Py, FIG. In B), the amount of combustion is reduced.
【００１９】(3) 誘引ファン１６の回転数の増減で炉圧
制御できる通常燃焼範囲（Ｂゾーン）では、煙道ダンパ
１７は常に全開とし、無駄なエネルギロスを回避する。 (4) 誘引ファン１６の回転数が下限値に到達したとき、
炉圧実績値Ｐx が炉圧設定値Ｐy よりも小さい場合に
は、低負荷燃焼範囲（Ａゾーン）内にて煙道ダンパ１７
を介入させる。(3) In the normal combustion range (B zone) where the furnace pressure can be controlled by increasing or decreasing the number of revolutions of the induction fan 16, the flue damper 17 is always fully opened to avoid unnecessary energy loss. (4) When the rotation speed of the induction fan 16 reaches the lower limit value,
When the actual furnace pressure value Px is smaller than the furnace pressure set value Py, the flue damper 17 is set in the low load combustion range (A zone).
To intervene.
【００２０】尚、炉圧指示調節計１５は、誘引ファン１
６を例えばインバータ制御方式にて制御する。このイン
バータ制御は、誘引ファン１６の駆動モータへ供給する
交流電流の周波数を変換することにて、誘引ファン１６
の回転数を増減するものである。The furnace pressure indicating controller 15 is the induction fan 1
6 is controlled by an inverter control system, for example. This inverter control converts the frequency of the alternating current supplied to the drive motor of the attracting fan 16 into the attracting fan 16
The number of rotations of is increased or decreased.
【００２１】以下、本実施例の作用について説明する。The operation of this embodiment will be described below.
【００２２】通常燃焼時に、煙道ダンパ１７は完全に
全開を維持するものとなり、煙道ダンパ１７の常時介入
によるエネルギロスを回避できる。During normal combustion, the flue damper 17 is kept fully open, and energy loss due to constant intervention of the flue damper 17 can be avoided.
【００２３】通常燃焼時には、誘引ファン１６の回転
数の連続的な増減により炉圧を高精度で制御できる。ま
た、誘引ファン１６の回転数が下限に到達した低負荷燃
焼時には、煙道ダンパ１７の介入により、排ガスドラフ
ト力を制御し、炉圧を高精度に制御できる。即ち、高範
囲の燃焼に対し、炉圧を安定制御できる。During normal combustion, the furnace pressure can be controlled with high accuracy by continuously increasing or decreasing the number of revolutions of the induction fan 16. Further, during low load combustion when the rotation speed of the induction fan 16 has reached the lower limit, the exhaust gas draft force can be controlled by the intervention of the flue damper 17, and the furnace pressure can be controlled with high accuracy. That is, the furnace pressure can be controlled stably for a high range of combustion.
【００２４】図２（Ａ）は、前述の炉圧制御装置１０を
継目無鋼管用回転炉床式の加熱炉１１に適用した具体例
である。煙道１２の中間部には、予熱炉１１Ａ、レキュ
ペレータ１１Ｂ、廃熱ボイラ１１Ｃが配設されている。
図２の場合、加熱炉１１から煙突１３までの煙道１２が
長いため、炉圧検出器１４はレキュペレータ１１Ｂの入
側に設置した。圧力の制御ポイントは、炉内に限定され
ず、図２の場合のように煙道１２であっても良い。FIG. 2A shows a concrete example in which the furnace pressure control device 10 is applied to a rotary hearth type heating furnace 11 for seamless steel pipes. A preheating furnace 11A, a recuperator 11B, and a waste heat boiler 11C are arranged in the middle of the flue 12.
In the case of FIG. 2, since the flue 12 from the heating furnace 11 to the chimney 13 is long, the furnace pressure detector 14 is installed on the inlet side of the recuperator 11B. The control point of the pressure is not limited to the inside of the furnace, and may be the flue 12 as in the case of FIG.
【００２５】図２（Ｂ）は誘引ファン１６の回転数制御
線図と煙道ダンパ１７の開度制御線図である。また、図
２（Ｃ）は煙道圧力設定値である。FIG. 2B is a rotational speed control diagram of the induction fan 16 and an opening control diagram of the flue damper 17. Further, FIG. 2C shows the flue pressure setting value.
【００２６】図２（Ａ）の具体的実施例により、下記
、を効果を認めた。The following effects were recognized by the concrete example of FIG. 2 (A).
【００２７】誘引ファン１６の回転数を連続的に制御
するものとしたことにより、誘引ファン１６の回転数を
最大回転数にて一定保持したものに比して、ファンモー
タ消費電力を113kw から20kwに低減できる、省電力効果
を認めた。Since the rotation speed of the induction fan 16 is continuously controlled, the fan motor power consumption is 113 kw to 20 kw compared to the case where the rotation speed of the induction fan 16 is kept constant at the maximum rotation speed. The power saving effect was recognized.
【００２８】低負荷燃焼時にも、煙道ダンパ１７の開
度制御によって適正炉圧を保つことができ、炉開口部か
らの侵入空気を削減できたことにより、燃焼量1500L/H
以下の低負荷燃焼時の燃料原単位は約 1×104kcal/T 削
減できることを認めた。Even at low load combustion, the proper furnace pressure can be maintained by controlling the opening of the flue damper 17, and the amount of air entering from the furnace opening can be reduced.
It was confirmed that the fuel consumption rate at low load combustion below could be reduced by about 1 × 10 4 kcal / T.
【００２９】[0029]
【発明の効果】以上のように本発明によれば、煙道ダン
パの常時介入によるエネルギロスを回避し、かつ炉圧を
安定制御することができる。As described above, according to the present invention, it is possible to avoid the energy loss due to the constant intervention of the flue damper and to stably control the furnace pressure.
【図１】図１は本発明の一実施例を示す模式図である。FIG. 1 is a schematic view showing an embodiment of the present invention.
【図２】図２は本発明の具体的実施例を示す模式図であ
る。FIG. 2 is a schematic diagram showing a specific example of the present invention.
１０ 炉圧制御装置 １１ 炉 １４ 炉圧検出器 １５ 炉圧指示調節計 １６ 誘引ファン １７ 煙道ダンパ 10 Furnace Pressure Control Device 11 Furnace 14 Furnace Pressure Detector 15 Furnace Pressure Indicating Controller 16 Induction Fan 17 Flue Damper
Claims (1)
することにより、炉圧を制御する炉圧制御方法におい
て、低負荷燃焼時には、誘引ファンを下限回転数にて運
転するとともに、煙道ダンパを開閉することにて炉圧制
御し、通常燃焼時には、煙道ダンパを全開とするととも
に、誘引ファンの回転数を連続的に増減することにて炉
圧制御することを特徴とする炉圧制御方法。1. A furnace pressure control method for controlling furnace pressure by inducing and discharging exhaust gas of a furnace with an induction fan, wherein the induction fan is operated at a lower limit rotation speed and a flue gas duct during low load combustion. The furnace pressure is controlled by opening and closing the damper, and during normal combustion, the flue damper is fully opened and the furnace pressure is controlled by continuously increasing and decreasing the number of revolutions of the induction fan. Control method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35534392A JPH06184652A (en) | 1992-12-21 | 1992-12-21 | Furnace pressure control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35534392A JPH06184652A (en) | 1992-12-21 | 1992-12-21 | Furnace pressure control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06184652A true JPH06184652A (en) | 1994-07-05 |
Family
ID=18443391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35534392A Withdrawn JPH06184652A (en) | 1992-12-21 | 1992-12-21 | Furnace pressure control method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06184652A (en) |
-
1992
- 1992-12-21 JP JP35534392A patent/JPH06184652A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000307 |