JPS6046337B2 - Boiler combustion control device - Google Patents
Boiler combustion control deviceInfo
- Publication number
- JPS6046337B2 JPS6046337B2 JP52149120A JP14912077A JPS6046337B2 JP S6046337 B2 JPS6046337 B2 JP S6046337B2 JP 52149120 A JP52149120 A JP 52149120A JP 14912077 A JP14912077 A JP 14912077A JP S6046337 B2 JPS6046337 B2 JP S6046337B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- fuel
- boiler
- flow rate
- amount
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2237/00—Controlling
- F23N2237/08—Controlling two or more different types of fuel simultaneously
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)
Description
【発明の詳細な説明】
本発明は複数種類の燃料を焚くボイラをボイラ・マスタ
信号に従つて制御する制御装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device that controls a boiler that burns a plurality of types of fuel according to a boiler master signal.
ボイラの燃焼制御装置においては、燃料の流量と空気の
流量がいずれもボイラ・マスタ信号に従つて制御される
。In a boiler combustion control device, both the fuel flow rate and the air flow rate are controlled according to a boiler master signal.
複数種類の燃料を焚くボイラ（製鉄所のボイラなど）に
おいては、各燃料ごとに必要な空気量が異なるために、
かなり多めに空気を投入して完全燃焼をはかるのが普通
である。In boilers that burn multiple types of fuel (such as boilers in steel plants), the amount of air required for each fuel is different.
Normally, a large amount of air is injected to achieve complete combustion.
しかしこのような方法は効率が悪く、また公害防止の上
からも好ましくない。そこで、ボイラ・マスタ信号に従
つて制御される空気の流量を、燃料の組成に応じた適切
なものにするための工夫が必要とされる。However, such a method is inefficient and is also undesirable from the standpoint of preventing pollution. Therefore, it is necessary to devise a way to make the flow rate of air controlled according to the boiler master signal appropriate according to the composition of the fuel.
本発明の目的は、複数種類の燃料を焚くボイラにおいて
、燃料流量と空気流量をいずれもボイラ・マスタ信号に
基づいで制御しながら、ボイラを低過剰空気て運転する
燃焼制御装置を提供することにある。An object of the present invention is to provide a combustion control device for a boiler that burns multiple types of fuel, which operates the boiler with low excess air while controlling both the fuel flow rate and the air flow rate based on a boiler master signal. be.
本発明は、
ボイラ・マスタ信号が設定信号として与えられ、後述す
る第１の加算器の出力信号が入力信号として与えられ、
これら両信号の差に基づく燃料流量制御信号を出力する
燃料流量調節計、ボイラに供給される空気の流量信号が
入力信号として与えられ、後述する掛算器の出力信号が
設定信号として与えられ、これら両信号の差に基づく空
気流量制御信号を出力する空気流量調節計、ボイラに供
給される複数の種類の燃料のおのおのの流量Ｖｉを、実
質的に、その燃料による単位蒸発量Ｃｉとボイラ・マス
タ信号が１００パーセントのときの熱量Ｚの逆数との積
で重み付けして加算する第１の加算器、ボイラに供給さ
れる複数の種類の燃料のおのおのの流量Ｖｉを、，実質
的に、その燃料に対する単位理論空気量Ａｉと１つの燃
料の単位蒸発量引と同じ１つの燃料の単位理論空気量ａ
１の逆数とボイラ・マスタ信号が１００パーセントのと
きの熱量ｚの逆数との積で重み付けして加算する第２の
加算器、第２の加算器の出力信号を第１の加算器の出力
信号で割算する割算器、ボイラ・マスタ信号に上記１つ
の燃料をボイラで専焼するとしたときの過剰空気率ηの
逆数を掛けた信号を発生する関数発生器、及び
この関数発生器の出力信号と前記割算器の出力信号との
積を求める掛算器を具備するボイラの燃焼制御装置
によつて上記の目的を達成したものである。In the present invention, a boiler master signal is given as a setting signal, an output signal of a first adder to be described later is given as an input signal,
A fuel flow controller outputs a fuel flow control signal based on the difference between these two signals, the flow rate signal of air supplied to the boiler is given as an input signal, and the output signal of a multiplier to be described later is given as a setting signal. An air flow controller outputs an air flow control signal based on the difference between the two signals, and the flow rate Vi of each of a plurality of types of fuel supplied to the boiler is substantially determined by the unit evaporation amount Ci of the fuel and the boiler master. The first adder weights and adds the flow rate Vi of each of the plurality of types of fuel supplied to the boiler by the product with the reciprocal of the amount of heat Z when the signal is 100%. The unit theoretical air amount Ai of one fuel is the same as the unit evaporation amount of one fuel minus the unit theoretical air amount Ai for
A second adder weights and adds the product of the reciprocal of 1 and the reciprocal of the amount of heat z when the boiler master signal is 100%, and the output signal of the second adder is added to the output signal of the first adder. a function generator that generates a signal obtained by multiplying the boiler master signal by the reciprocal of the excess air ratio η when the above one fuel is exclusively burned in the boiler, and an output signal of this function generator. The above object is achieved by a combustion control device for a boiler, which is equipped with a multiplier for calculating the product of the output signal of the multiplier and the output signal of the divider.
以下図面によつて本発明を説明する。図は本発明実施例
の概念的構成図てある。図において、ＣＴＬｌおよびＣ
ＴＩ−２はそれぞれ燃料流量調節計および空気流量調節
計である。燃料流量調節計ＣＴＬｌには各燃量の流量が
それぞれ流量検出器Ｆ１〜Ｆ４で検出され加算器Ｓ１で
重み付け加算されて、入力信号として与えられる、ボイ
ラ・マスタ信号ＢＭＳが設定信号として与えられる。空
気流量調節討ＣＴＬ２には空気の流量が流量検出器Ａで
検出され入力信号として与えられ、ボイラ・マスタ信号
ＢＭＳが関数発生器ＦＸと掛算器Ｍで補正されて設定信
号として与えられる。両調節計は設定信号とそれぞれの
入力信号との差に基づいて、それぞれ燃料流量制御信号
ＦＣＳおよび空気流量制御信号ＡＣＳを生じる。関数発
生器ＦＸには後述のような入出力特性が付与され、ボイ
ラ・マスタ信号ＢＭＳと所定の関係にある出力信号Ｅ４
が発生される。The present invention will be explained below with reference to the drawings. The figure is a conceptual configuration diagram of an embodiment of the present invention. In the figure, CTLl and C
TI-2 are a fuel flow controller and an air flow controller, respectively. A boiler master signal BMS, in which the flow rate of each fuel is detected by the flow rate detectors F1 to F4, weighted and added by the adder S1, and is given as an input signal, is given to the fuel flow rate controller CTLl as a setting signal. The air flow rate is detected by a flow rate detector A and given as an input signal to the air flow rate adjustment CTL2, and the boiler master signal BMS is corrected by a function generator FX and a multiplier M and given as a setting signal. Both controllers produce a fuel flow control signal FCS and an air flow control signal ACS, respectively, based on the difference between the setpoint signal and their respective input signals. The function generator FX is given input/output characteristics as described below, and outputs an output signal E4 having a predetermined relationship with the boiler master signal BMS.
is generated.
割算器Ｄには加算器Ｓｌ，Ｓ２によつて各燃料の流量信
号が重み付け加算された結果Ｅｌ，Ｅ２が与えられる。
割算器Ｄは信号Ｅ２をＥ１で割算してその結果Ｅ３を掛
算器Ｍに与える。さて、低過剰空気で燃焼を維持するた
めにはボイラ・マスタ信号ＢＭＳが適切に空気流量信号
ＡＦ′Ｓ相当の信号に変換されて空気流量調節器ＣＴＬ
２に設定され名必要がある。The divider D is given El, E2 as a result of weighted addition of the flow rate signals of each fuel by the adders Sl, S2.
Divider D divides signal E2 by E1 and provides the result E3 to multiplier M. Now, in order to maintain combustion with low excess air, the boiler master signal BMS is appropriately converted into a signal equivalent to the air flow rate signal AF'S, and the air flow controller CTL
Name must be set to 2.
ボイラ・マスタ信号ＢＭＳは熱量に基づく信号であつて
次式で表わされる。ただし、
Ｚ・・・ＢＭＳ＝１００％のときの熱量（Ｃａｅ／Ｈ）
Ｑｉ・・・燃料流量計Ｆｉの測定レンジ（Ｎｄ／Ｈ）ｃ
ピ・・燃料１による単位蒸発量（Ｃａｅ／Ｎｄ）ｆピ・
・燃料１の流量（％）これに対す−る空気の必要量は次
式で表わされる。The boiler master signal BMS is a signal based on the amount of heat and is expressed by the following equation. However, Z...The amount of heat when BMS=100% (Cae/H)
Qi...Measurement range of fuel flow meter Fi (Nd/H) c
Pi... Unit evaporation amount (Cae/Nd) f Pi...
・Flow rate (%) of fuel 1 The required amount of air for this is expressed by the following formula.
ただし、η・・・過剰空気率
Ｙ・・・ＡＦＳ＝１００％のときの空気流量（Ｎｄ／Ｈ
）ａピ・・燃料１に対する単位理論空気量（Ｎｄ／Ｎイ
）したがつてボイラ・マスタ信号ＢＭＳを空気流量信号
ＡＦＳ相当の信号に変換する係数は次式で与えられるか
ら、ボイラ・マスタ信号ＢＭＳに（３）式の係数を掛け
れば、空気流量調節信号ＣＴＬ２に設定する適正な信号
が次式のように得られる。However, η...Excess air rate Y...Air flow rate when AFS=100% (Nd/H
) a pi... unit theoretical air amount for fuel 1 (Nd/N i) Therefore, the coefficient for converting the boiler master signal BMS into a signal equivalent to the air flow rate signal AFS is given by the following equation, so the boiler master signal By multiplying BMS by the coefficient of equation (3), an appropriate signal to be set as the air flow rate adjustment signal CTL2 can be obtained as shown in the following equation.
すなわちこの式がボイラ・マスタ信号ＢＭＳを空気流量
信号，ＡＦ′Ｓ相当の信号に変換する関数となる。That is, this equation becomes a function for converting the boiler master signal BMS into a signal equivalent to the air flow rate signal, AF'S.
いま単一燃料として主燃料１（通常この燃料のみで定格
ボイラ負荷運転が可能な燃料）の専燃状態を仮定すると
（４）式は次のようになる。Assuming that the main fuel 1 (normally, the rated boiler load can be operated only with this fuel) is in the exclusive combustion state as the single fuel, equation (4) becomes as follows.
ここで、ηとして単一燃料に対して各負荷帯ごとに適正
な過剰空気率を確保できる値が用いられたとすると、変
換関数は次式となるべきである。したがつて、となる。Here, if a value that can ensure an appropriate excess air ratio for each load zone for a single fuel is used as η, then the conversion function should be as shown in the following equation. Therefore, it becomes.
ηは単一燃料の専焼状態における過剰空気率であるから
、容易に求めることができ、したがつて変換関数η・Ｂ
ＭＳは容易に関数発生器ＦＸに設定することができる。
単一燃料としては主燃料１を選定するのが一般であるが
、他の燃料２〜燃料４を選定しても（７）式に相当する
関係を容易に導くことができる。多種燃料に対しては（
７）式の関係を（４）式に入れることによつて次のよう
な変換関数を得ることができる。Since η is the excess air ratio in the exclusive combustion state of a single fuel, it can be easily determined, and therefore the conversion function η・B
MS can be easily set to function generator FX.
Generally, main fuel 1 is selected as the single fuel, but even if other fuels 2 to 4 are selected, the relationship equivalent to equation (7) can be easily derived. For various fuels (
By inserting the relationship in equation (7) into equation (4), the following conversion function can be obtained.
とすると、（８）式は次のように書ける（９）式のＫ，
は燃料１の流量Ｆ，を燃料１の流量カロリーベースに変
換する係数、００）式のＨ，は燃料ｉの流量Ｆ，を理論
空気ベースに変換する係数であると言える。Then, equation (8) can be written as follows: K in equation (9),
can be said to be a coefficient for converting the flow rate F of fuel 1 into a flow rate calorie basis of fuel 1, and H in equation 00) is a coefficient for converting the flow rate F of fuel i into a theoretical air base.
ここで、Ｑ，，ｃｉ，ａ，およびＺは既知の定数である
から、Ｋ，，ｈ，も定数となる。Here, since Q,, ci, a, and Z are known constants, K,, h, is also a constant.
そこで加算器Ｓ１は（１１）式におけるΣＫ，ｆ，を算
出するもので、燃料流量信号Ｆ，を係数でＫ，で重み付
けして加算した出力Ｅ１を発生する。Therefore, the adder S1 calculates ΣK,f in equation (11), and generates an output E1 that is the sum of the fuel flow rate signal F, weighted by a coefficient K.
次に加算？２は（１１）式におけるぞＨ，ｆ，を算出す
るもので、燃料流量ＦＩを係数ＨＩで重み付けして加算
した出力Ｅ２を発生する。Ｄはこれら出力の商を算出す
る割算器でＥ３＝Ｅ２／Ｅ１を出力するので、Ｅ３＝干
Ｈｉｆｉ／Ｉｋｉｆｉとなる。これを掛算器Ｍで関数発
生器下Ｘの出力信号に掛算すると、（１１）式に従つた
信号が得られる。したがつて空気流量調節討ＣＴＬ２に
は適正な設定信号が与えられるので、空気流量調節訂Ｃ
ＴＬ２により空気流量は適正な低過剰状態に制御される
。なお、上記の実施例は燃料流量検出器Ｆ１〜Ｆ４の出
力信号Ｆ，がそれぞれの測定レンジＱ，の％でノ得られ
る例であるが、Ｑ，ｆ，は絶対値流量に他ならないので
、これを■として次式により変換を行うようにしてもよ
い。Addition next? 2 calculates H and f in equation (11), and generates an output E2 obtained by weighting and adding the fuel flow rate FI with a coefficient HI. D is a divider that calculates the quotient of these outputs and outputs E3=E2/E1, so E3=Hifi/Ikifi. When this is multiplied by the output signal of the function generator lower X by the multiplier M, a signal according to equation (11) is obtained. Therefore, since an appropriate setting signal is given to the air flow rate adjustment controller CTL2, the air flow rate adjustment controller CTL2 is given an appropriate setting signal.
The air flow rate is controlled to an appropriate low excess state by TL2. Note that the above embodiment is an example in which the output signals F of the fuel flow rate detectors F1 to F4 are obtained as percentages of the respective measurement ranges Q, but since Q and f are nothing but absolute value flow rates, This may be set as ■ and the conversion may be performed using the following equation.
本発明の特徴は複数の燃料のうちの一つ例えば主燃料に
着目して、他の燃量流量信号を熱量ベーフスでも理論空
気量ベースでも変換する点にある。The feature of the present invention is to focus on one of the plurality of fuels, for example, the main fuel, and convert other fuel flow signals either on a calorific value basis or on a theoretical air quantity basis.
つまりボイラ燃料として最も重要な単位燃料当りの発熱
量と理論空気量の単純な物性値のみを使用するので、他
の燃料の比重や流量の計測方法等に支配されないで適正
な空気流量を算出することができる。以上のように、本
発明によれば、複数種類の燃料を焚くボイラにおいて、
燃料流量と空気流量をいずれもボイラ・マスタ信号に基
づいて制御しながら、ボイラを低過剰空気で運転する燃
焼制御装置が実現できる。In other words, since only the simple physical property values of the calorific value per unit fuel and theoretical air volume, which are the most important for boiler fuel, are used, the appropriate air flow rate can be calculated without being influenced by other fuel specific gravity or flow rate measurement methods. be able to. As described above, according to the present invention, in a boiler that burns multiple types of fuel,
It is possible to realize a combustion control device that operates a boiler with low excess air while controlling both the fuel flow rate and air flow rate based on the boiler master signal.
図は本発明実施例の概念的構成図である。
ＣＴＬｌ・・・・・・燃料流量調節計、ＣＴＬ２・・・
・・・空気流量調節計、Ｆ１〜Ｆ４・・・・・・燃料流
量検出器、Ａ・・・・空気流量検出器、Ｓｌ，Ｓ２・・
・・・・加算器、Ｄ・・・・・・割算器、Ｍ・・・・・
・掛算器、ＦＸ・・・・・・関数発生器。The figure is a conceptual configuration diagram of an embodiment of the present invention. CTLl...Fuel flow rate controller, CTL2...
...Air flow rate controller, F1-F4...Fuel flow rate detector, A...Air flow rate detector, Sl, S2...
... Adder, D ... Divider, M ...
・Multiplier, FX...Function generator.
Claims (1)
述する第１の加算器の出力信号が入力信号として与えら
れ、これら両信号の差に基づく燃料流量制御信号を出力
する燃料流量調節計、ボイラに供給される空気の流量信
号が入力信号として与えられ、後述する掛算器の出力信
号が設定信号として与えられ、これら両信号の差に基づ
く空気流量制御信号を出力する空気流量調節計、ボイラ
に供給される複数の種類の燃料のおのおのの流量Ｖｉを
、実質的に、その燃料による単位蒸発量ｃｉとボイラ・
マスタ信号が１００パーセントのときの熱量Ｚの逆数と
の積で重み付けして加算する第１の加算器、ボイラに供
給される複数の種類の燃料のおのおのの流量Ｖｉを、実
質的に、その燃料に対する単位理論空気量ａｉと１つの
燃料の単位蒸発量ｃｌと同じ１つの燃料の単位理論空気
量ａｌの逆数とボイラ・マスタ信号が１００パーセント
のときの熱量Ｚの逆数との積で重み付けして加算する第
２の加算器、第２の加算器の出力信号を第１の加算器の
出力信号で割算する割算器、ボイラ・マスタ信号に上記
１つの燃料をボイラで専焼するとしたときの過剰空気率
ηを掛けた信号を発生する関数発生器、及び この関数発生器の出力信号と前記割算器の出力信号との
積を求める掛算器を具備するボイラの燃焼制御装置。[Claims] 1. A fuel system that receives a boiler master signal as a setting signal, receives an output signal of a first adder (described later) as an input signal, and outputs a fuel flow control signal based on the difference between these two signals. The flow rate controller receives the flow rate signal of air supplied to the boiler as an input signal, receives the output signal of a multiplier described later as a setting signal, and outputs an air flow rate control signal based on the difference between these two signals. The controller essentially calculates the flow rate Vi of each of the plurality of types of fuel supplied to the boiler by calculating the unit evaporation amount ci of the fuel and the boiler.
The first adder weights and adds the amount of heat Z by the product of the reciprocal of the amount of heat Z when the master signal is 100%, and the flow rate Vi of each of the plurality of types of fuel supplied to the boiler is substantially added. Weighted by the product of the unit theoretical air amount ai, the unit evaporation amount cl of one fuel, the reciprocal of the unit theoretical air amount al of one fuel, and the reciprocal of the heat amount Z when the boiler master signal is 100%. A second adder that adds, a divider that divides the output signal of the second adder by the output signal of the first adder, and a boiler master signal that is used when the above one fuel is burnt exclusively in the boiler. A combustion control device for a boiler, comprising a function generator that generates a signal multiplied by an excess air ratio η, and a multiplier that calculates the product of the output signal of the function generator and the output signal of the divider.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP52149120A JPS6046337B2 (en) | 1977-12-12 | 1977-12-12 | Boiler combustion control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP52149120A JPS6046337B2 (en) | 1977-12-12 | 1977-12-12 | Boiler combustion control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5481528A JPS5481528A (en) | 1979-06-29 |
| JPS6046337B2 true JPS6046337B2 (en) | 1985-10-15 |
Family
ID=15468148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP52149120A Expired JPS6046337B2 (en) | 1977-12-12 | 1977-12-12 | Boiler combustion control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6046337B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103822225A (en) * | 2013-12-31 | 2014-05-28 | 深圳市国创新能源研究院 | Integrated low-nitrogen combustion system and control method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4825359B2 (en) * | 2001-04-10 | 2011-11-30 | テイ・エス テック株式会社 | Rotating sheet |
-
1977
- 1977-12-12 JP JP52149120A patent/JPS6046337B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103822225A (en) * | 2013-12-31 | 2014-05-28 | 深圳市国创新能源研究院 | Integrated low-nitrogen combustion system and control method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5481528A (en) | 1979-06-29 |
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