JPS6256710A - Temp. control method of furnace - Google Patents

Temp. control method of furnace

Info

Publication number
JPS6256710A
JPS6256710A JP60194616A JP19461685A JPS6256710A JP S6256710 A JPS6256710 A JP S6256710A JP 60194616 A JP60194616 A JP 60194616A JP 19461685 A JP19461685 A JP 19461685A JP S6256710 A JPS6256710 A JP S6256710A
Authority
JP
Japan
Prior art keywords
temp
control
furnace
temperature
combustion
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.)
Pending
Application number
JP60194616A
Other languages
Japanese (ja)
Inventor
Yoshiyuki Hashimoto
橋本 善幸
Hiroshi Miyake
弘士 三宅
Osamu Mori
修 森
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP60194616A priority Critical patent/JPS6256710A/en
Publication of JPS6256710A publication Critical patent/JPS6256710A/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N1/00Regulating fuel supply
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00Ignition or checking
    • F23N2227/10Sequential burner running

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)

Abstract

PURPOSE:To improve energy saving feature, operability of a furnace, and temp. distribution in the furnace by switching operation to a proportional control in a high burning and to an on-off control in a low burning range. CONSTITUTION:During a high burning time, the burning amount is continuously changed using such an advantage of a proportional control that fuel to air ratio is kept at a constant level and energy saving and temp. distribution properties are excellent as wee. On the other hand, during a low burning time, an on-off operation is carried out under the condition which throttles the amount of fuel and air together. Without stopping some of the burners and introducing excess air, the temp. range between the upper and lower limits is kept small as compared with an conventional on-off operation with improved temp. distribution during this operation. Switching temp. from the proportional to the on-off operation is determined by measuring the furnace inside temp. distribution. And, operation may be switched over automatically at an appropriate switching temp.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、燃焼炉における温度制御に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to temperature control in a combustion furnace.

(従来の技術および発明の解決すべき問題点)燃焼炉に
おける公知の代表的な温度制御方式として、比例制御と
オン・オフ制御がある。
(Prior Art and Problems to be Solved by the Invention) Typical known temperature control methods for combustion furnaces include proportional control and on-off control.

比例制御は比率制御とら呼ばれ、燃料と空気の割合が一
定となるようにするもので、その方法として、一方の流
量を測定して他方を調節する、一方の圧力を検出して他
方を調節する、両方を機械的に連動させる等がある。い
ずれにしても、比例制御は連続的にエネルギー投入量を
加減する特徴を持つ。バーナ一定格量に近い範囲即ち高
燃焼時(第4図(a)参照)では温度分布、エネルギー
とも全く問題はないが低燃焼域では問題がある。つまり
、バーナーのターンダウンの限界以下では燃焼が不安定
となるため、バーナーの着火本数を減らす(第4図(b
)参照)とか、過剰の空気を入れて安定燃焼を維持する
(第4図(c)参照)等の対策がとられるが、萌者では
温度分布の不良、後者では省エネルギー性の点でまた、
雨音とし人の手間がかかる点で問題がある。
Proportional control, also known as ratio control, ensures that the ratio of fuel and air remains constant.It can be done by measuring the flow rate of one and adjusting the other, or by detecting the pressure of one and adjusting the other. There are many ways to do this, such as mechanically interlocking both. In any case, proportional control has the characteristic of continuously adjusting the amount of energy input. There is no problem with temperature distribution or energy in a range close to the burner's rated capacity, that is, during high combustion (see FIG. 4(a)), but there is a problem in a low combustion range. In other words, below the burner turndown limit, combustion becomes unstable, so reduce the number of burner ignitions (see Figure 4 (b).
), or by introducing excess air to maintain stable combustion (see Figure 4 (c)), but the latter suffers from poor temperature distribution, and from the energy saving point of view.
There is a problem in that it requires a lot of human effort to make the sound of rain.

他方、オン・オフ制御はバーナーの燃料と空気の開度を
一定にセラl−しておいた状態で、燃料および空気を流
すかあるいは11:、めるかの制御である。
On the other hand, the on/off control is a control of whether the fuel and air are allowed to flow or not while the opening degrees of the fuel and air of the burner are kept constant.

流す場合には、たえず燃焼性の良い状態でイイ[持され
る。エネルギー投入量はオン・オフの時間の割合で調節
されるが、温度の変動が大きい。オン・オフの際は、燃
料、空気とも同時にオン・オフすると黒煙が発生ずる危
険があるので、オンの場合には空気を早めに出し、オフ
の場合には空気を遅れて止める方法か一般にとられるが
、これは過刺空気にあたるので、例えば温度上昇時の高
燃焼時には比例制御に比べて省エネルギー性で劣る。ま
た、定温保持時の低燃焼時では(第5図(b)参照)、
低燃焼時でしオン時の燃焼量は高燃焼時(第5図(a)
参照)と同じである。大容量の燃料がオン・オフするの
で、エネルギー投入量が急変し、炉内温度が変動しやす
いという問題がある。
When flushing, it must be kept in a good combustible state. The amount of energy input is adjusted by the ratio of on/off time, but the temperature fluctuates widely. When turning on and off, there is a danger that black smoke will be generated if both the fuel and air are turned on and off at the same time, so the general method is to let the air out early when it is on, and shut it off later when it is off. However, since this is turbulent air, it is less energy efficient than proportional control, for example, during high combustion when the temperature rises. In addition, during low combustion during constant temperature maintenance (see Figure 5(b)),
The combustion amount when turned on is the same as that at high combustion (Figure 5 (a)).
(see). Since a large amount of fuel is turned on and off, there is a problem in that the amount of energy input changes suddenly and the temperature inside the furnace tends to fluctuate.

本発明の目的は、省エネルギー性に優れ、操炉性が良く
、しかも炉内温度分布を良くする燃焼炉の新しい制御方
式を提供することである。
An object of the present invention is to provide a new control method for a combustion furnace that has excellent energy saving properties, good furnace operability, and improves temperature distribution within the furnace.

(問題点を解決するための手段) そこで、本発明者等は、比例制御の長所とオン・オフ制
御の長所をそれぞれ取り入れて組み合わせた新しい制御
方式を考案した。
(Means for Solving the Problems) Therefore, the present inventors devised a new control method that incorporates and combines the advantages of proportional control and on/off control.

本発明に係る燃焼炉の温度制御方式は、比例制御とオン
・オフ制御の機能を合わせ持ち、高燃焼域で比例制御、
低燃焼域でオン・オフ制御に、自動または手動で切り換
えて使用できる。
The combustion furnace temperature control method according to the present invention has both proportional control and on/off control functions, and has proportional control and on/off control functions in the high combustion range.
Can be used with automatic or manual switching for on/off control in the low combustion range.

(作用および発明の効果) 本発明に係る燃焼炉の温度制御方式は、高燃焼時では比
例制御とし、低燃焼時ではオン・オフ制御とする乙ので
ある。そのノとめ、高燃焼時では比例制御の長所である
燃料と空気の割合が−・定に保たれた状態で燃焼量を連
続的に変化4″るので、省エネルギー性、温度分布性と
も優れている。また、PID制御を行なえば、温度の変
動も小さい(第3図(a)参照)。一方、低燃焼時では
燃料、空気ともしぼってきた状態でオン・オフするので
、バーナーを間引きすることなくまた過剰空気を入れる
ことなく定温度で維持できるし、通常のオン・オフに比
べて温度の上5幅が小さくなり温度分布的に改善される
(第3図(b)参照)。また、比例からオン・オフへの
切換点は、6炉の状況により異なるので温度分布を実測
しながら適性に調節することができる。
(Operation and Effects of the Invention) The temperature control method of the combustion furnace according to the present invention is proportional control at high combustion times and on/off control at low combustion times. The bottom line is that during high combustion, the combustion amount is continuously changed while the ratio of fuel and air is kept constant, which is the advantage of proportional control, so it has excellent energy saving and temperature distribution. In addition, if PID control is performed, temperature fluctuations will be small (see Figure 3 (a)).On the other hand, during low combustion, the burners will be turned on and off with the fuel and air being pumped up, so the number of burners should be thinned out. It is possible to maintain a constant temperature without introducing excess air, and the upper width of the temperature is smaller than normal on/off, improving the temperature distribution (see Figure 3 (b)). Since the switching point from proportional to on/off differs depending on the situation of the six furnaces, it can be appropriately adjusted while actually measuring the temperature distribution.

(実施例) 以下、添付の図面を参照して本発明の詳細な説明する。(Example) Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

切換スイッチを用いた第1実施例のブロック図を第1図
に示す。比例制御系は、PID制御を行なう電流出力型
の温度指示調節計1、この温度指示調節計1の指示をコ
ントロールモータ等3に伝えろための変換器2、および
この変換52からの信号に応じて燃料と空気の割合を調
節するコントロールモータ等3からなる。一方、オン・
オフ制御系は、オン・オフパルス型の温度指示調節計4
、この温度指示調節計4の指示を電磁弁等6に伝えるた
めの変換器5、および、この変換器からの信号に応じて
燃料および空気の流れを開閉する電磁弁6からなる。プ
ログラム設定器7は、燃焼炉の温度上昇、定温度保持、
温度下降のプログラムを設定する。プログラム設定器7
の出力は、切換スイツチ(またはリレー)8を介して比
例制御系の温度指示調節計lまたはオン・オフ制御系の
温度指示調節計4に送られる。温度指示調節計1または
4は、図示しない炉内の温度分布を検出するセンサから
の信号に対応して温度調節を行なう。ここで、切換スイ
ッチ8は、高燃焼時には比例制御系に、低燃焼時にはオ
ン・オフ制御系に手動で切換えられる。比例制御からオ
ン・オフ制御への切換温度は、炉内の温度分布を実測し
ながら判断する。
A block diagram of a first embodiment using a changeover switch is shown in FIG. The proportional control system includes a current output type temperature indicating controller 1 that performs PID control, a converter 2 for transmitting instructions from the temperature indicating controller 1 to a control motor etc. 3, and a converter 52 that responds to signals from the converter 52. It consists of a control motor etc. 3 that adjusts the ratio of fuel and air. On the other hand,
The off control system is an on/off pulse type temperature indicating controller 4
, a converter 5 for transmitting the instruction from the temperature indicating controller 4 to a solenoid valve or the like 6, and a solenoid valve 6 for opening and closing the flow of fuel and air in response to signals from the converter. The program setting device 7 is configured to increase the temperature of the combustion furnace, maintain a constant temperature,
Set the temperature reduction program. Program setting device 7
The output is sent via a changeover switch (or relay) 8 to a temperature indicating controller 1 of a proportional control system or a temperature indicating controller 4 of an on/off control system. The temperature indicating controller 1 or 4 adjusts the temperature in response to a signal from a sensor (not shown) that detects the temperature distribution within the furnace. Here, the changeover switch 8 is manually switched to the proportional control system when the combustion is high, and to the on/off control system when the combustion is low. The switching temperature from proportional control to on/off control is determined by actually measuring the temperature distribution inside the furnace.

また、適性な切換温度で自動的に切換えてもよい。Alternatively, switching may be performed automatically at an appropriate switching temperature.

特殊開度設定器を用いた第2実施例のブロック図を第2
図に示す。プログラム設定器7は、プログラムにしたが
って信号を温度指示調節計11に送り、温度指示調節計
11は、図示しない炉内の温度分布を検出するセンサか
らの信号に対応して、温度制御の信号を特殊開度設定器
[2に送る。特殊開度設定器12は、開度が所定の開度
より大きいか小さいかに対応して(すなわち、温度が所
定の値より高いか低いかに対応して)比例制御系または
オン・オフ制御系に信号を送る。比例制御系では、変換
器13を介して、コントロールモータ等14を操作して
燃料と空気の流量と割合を制御する。オン・オフ制御系
では、パルス変換器15が特殊開度設定312の開度を
オン・オフのパルスに変換し、オンまたはオフに対応し
て、変換器16を介して電磁弁等17を操作させ、燃料
および空気を流すか止める。
The block diagram of the second embodiment using the special opening setting device is shown in the second example.
As shown in the figure. The program setting device 7 sends a signal to the temperature indicating controller 11 according to the program, and the temperature indicating controller 11 sends a temperature control signal in response to a signal from a sensor (not shown) that detects the temperature distribution in the furnace. Special opening setting device [Send to 2. The special opening setting device 12 controls a proportional control system or an on-off control system depending on whether the opening is larger or smaller than a predetermined opening (that is, depending on whether the temperature is higher or lower than a predetermined value). send a signal to. In the proportional control system, a control motor or the like 14 is operated via a converter 13 to control the flow rates and ratios of fuel and air. In the on/off control system, a pulse converter 15 converts the opening of the special opening setting 312 into on/off pulses, and operates a solenoid valve, etc. 17 via a converter 16 in response to on or off. and turn off or stop the flow of fuel and air.

なお、両実施例とも、センサまたは操作器(切換スイッ
チまたはリレー、コントロールモータ等)を除いた範囲
の機能をマイクロコンピュータに持たせることら可能で
ある。
In both embodiments, it is possible to provide the microcomputer with a range of functions other than sensors or operating devices (changeover switches, relays, control motors, etc.).

両実施例において、高燃焼時は比例制御であり、第3図
(a)に示すように、温度分布、エネルギー“面とも問
題がない。また、適当なPID制御を行なうと温度の変
動も小さい。
In both examples, proportional control is used during high combustion, and as shown in Fig. 3(a), there is no problem in terms of temperature distribution or energy.Furthermore, if appropriate PID control is performed, temperature fluctuations are small. .

比例制御(高燃焼時)からオン・オフ制御(低燃焼時)
への切換の際は、燃料、空気ともしぼった状態で比例制
御が行なわれているので、オン・オフ制御に移っても、
オン時の時間間隔が第3図(b)に示すように長〈従来
のオン・オフ制御(第5図(b)参照)に比べて温度の
変動が小さい。また、従来の比例制御の低燃焼時(第4
図(b)、 (c)参照)に比べて温度分布、エネルギ
ー面とも改拵される。
From proportional control (at high combustion) to on/off control (at low combustion)
When switching to on/off, proportional control is performed with both fuel and air reduced, so even when switching to on/off control,
As shown in FIG. 3(b), the time interval during on-time is long (temperature fluctuation is smaller than in conventional on-off control (see FIG. 5(b)). In addition, during low combustion of conventional proportional control (4th
Compared to Figures (b) and (c), the temperature distribution and energy aspects have been improved.

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

第1図と第2図は、それぞれ、本発明の実施例に係る制
御方式のブロック図である。 第3図(a) 、 (b)は、それぞれ、高燃焼時(比
例制御)と低燃焼時(オン・オフ制御)での温度と燃焼
量を示すグラフである。 第4図(a) 、 (1,1) 、 (e)は、それぞ
れ、比例制御において、高燃焼時、低燃焼時(バーナー
間引)、低燃焼時(過剰空気燃焼)の場合の炉内の各バ
ーナーの燃焼情況を図式的に示す図である。 第5図(a)、 (b)は、それぞれ、オン・オフ制御
において、高燃焼時と低燃焼時の場合の温度と燃焼量の
グラフである。 1〜3・・・比例制御系、 4〜6・・・オン・オフ制御系、 7・・・プログラム設定器、 8・・・切換スイッチまたはリレー。 特許出願人   株式会社 神戸製鋼所代  理  人
 弁理士 前出 葆ばか2名11111& 第28 オン・オフf7IJ#歪 13B
1 and 2 are block diagrams of control methods according to embodiments of the present invention, respectively. FIGS. 3(a) and 3(b) are graphs showing the temperature and combustion amount during high combustion (proportional control) and low combustion (on-off control), respectively. Figures 4(a), (1,1), and (e) show the inside of the furnace during high combustion, low combustion (burner thinning), and low combustion (excess air combustion) under proportional control, respectively. FIG. 2 is a diagram schematically showing the combustion situation of each burner. FIGS. 5(a) and 5(b) are graphs of temperature and combustion amount during high combustion and low combustion, respectively, in on-off control. 1-3...Proportional control system, 4-6...On/off control system, 7...Program setting device, 8...Selector switch or relay. Patent applicant Kobe Steel Co., Ltd. Representative Patent attorney Two idiots 11111 & 28th On/Off f7IJ #distortion 13B

Claims (1)

【特許請求の範囲】[Claims] (1)比例制御とオン・オフ制御の機能を合わせ持ち、
高燃焼域で比例制御、低燃焼域でオン・オフ制御に、自
動または手動で切り換えて使用できる燃焼炉の温度制御
方式。
(1) Combines proportional control and on/off control functions,
A combustion furnace temperature control method that can be used by automatically or manually switching between proportional control in the high combustion range and on/off control in the low combustion range.
JP60194616A 1985-09-02 1985-09-02 Temp. control method of furnace Pending JPS6256710A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60194616A JPS6256710A (en) 1985-09-02 1985-09-02 Temp. control method of furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60194616A JPS6256710A (en) 1985-09-02 1985-09-02 Temp. control method of furnace

Publications (1)

Publication Number Publication Date
JPS6256710A true JPS6256710A (en) 1987-03-12

Family

ID=16327496

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60194616A Pending JPS6256710A (en) 1985-09-02 1985-09-02 Temp. control method of furnace

Country Status (1)

Country Link
JP (1) JPS6256710A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011202842A (en) * 2010-03-25 2011-10-13 Ihi Packaged Boiler Co Ltd Once-through boiler device and combustion control method for once-through boiler
JP2018119700A (en) * 2017-01-23 2018-08-02 中外炉工業株式会社 Heating device inside refractory vessel and heating method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011202842A (en) * 2010-03-25 2011-10-13 Ihi Packaged Boiler Co Ltd Once-through boiler device and combustion control method for once-through boiler
JP2018119700A (en) * 2017-01-23 2018-08-02 中外炉工業株式会社 Heating device inside refractory vessel and heating method

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