JPS62202929A - Flow rate control unit of variable speed fan - Google Patents
Flow rate control unit of variable speed fanInfo
- Publication number
- JPS62202929A JPS62202929A JP61043981A JP4398186A JPS62202929A JP S62202929 A JPS62202929 A JP S62202929A JP 61043981 A JP61043981 A JP 61043981A JP 4398186 A JP4398186 A JP 4398186A JP S62202929 A JPS62202929 A JP S62202929A
- Authority
- JP
- Japan
- Prior art keywords
- fan
- flow rate
- discharge pressure
- discharge
- pressure
- 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.)
- Granted
Links
- 238000009423 ventilation Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
- F23N5/184—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2223/00—Signal processing; Details thereof
- F23N2223/36—PID signal processing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/04—Measuring pressure
- F23N2225/06—Measuring pressure for determining flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2233/00—Ventilators
- F23N2233/06—Ventilators at the air intake
- F23N2233/08—Ventilators at the air intake with variable speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/02—Air or combustion gas valves or dampers
- F23N2235/06—Air or combustion gas valves or dampers at the air intake
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は制御性と省エネルギーとの両立を達成した可変
速ファンの流量制御装置に係り、特に火力発電所内の押
込ファン、誘引通風機、１次空気通風機及びガス再循環
ファン等の流量制御に好適な制御装置に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a flow rate control device for a variable speed fan that achieves both controllability and energy saving, and is particularly applicable to forced fans, induced draft fans, and 1 in thermal power plants. The present invention relates to a control device suitable for controlling the flow rate of secondary air ventilators, gas recirculation fans, etc.
従来の流量制御装置は、雑誌「火力発電必携」Ｐ１７４
〜１７７に記載の超臨界圧ボイラの制御系統の例のよう
に、オリアイス等の差圧式にて計６１３された実窒気流
量を制御系のフィート′バック信号としていた。The conventional flow control device is described in the magazine "Thermal Power Generation Essentials" P174
As in the example of the control system for a supercritical pressure boiler described in 177, the actual nitrogen flow rate calculated by the differential pressure system such as Olyce was used as the foot'back signal for the control system.
しかし差圧発生器を設置する事により通風損失が増加し
、また大口径差圧発生器を煙風コ■内に設置する事によ
り、膨大な費用を生じるといった点については特に配慮
されていなかった。However, no particular consideration was given to the fact that installing a differential pressure generator would increase ventilation loss, and that installing a large-diameter differential pressure generator inside a smoke ventilation chamber would incur enormous costs. .
第４図に従来の風道内に設置１嘔れている差圧発生器の
取付図例を示すが１例えば３５０ＭＷ級火力発電所の風
道１０４０寸法は縦横約１０ｍにも及ぶ大きさである。FIG. 4 shows an example of an installation diagram of a differential pressure generator installed in a conventional wind duct. For example, the wind duct 1040 of a 350 MW class thermal power plant has dimensions of about 10 meters in length and width.
この風道１０４の１部にエアフォイル１００と称する飛
行機の羽根形ｔした翼を図のように複数個設置し、エア
フォイル１００の前面孔１０１より動圧を側面横孔１０
２より静圧を測定し、それぞれのエアフォイル１００の
動圧、静圧は外部に設けられた差圧動圧＝ｆｆ１０３に
て平均化されて差圧光１ｇ器の人力となる。なお、エア
フォイル１００から得られる差圧は、風量１０４内の気
体の流値の自乗に比例した１１［が得られる。従って実
際の流量ｒｉ差圧導圧管１０３から得られた差圧を別途
設けられた差圧発信器で受け。A plurality of aircraft blade-shaped wings called airfoils 100 are installed in a part of this airway 104 as shown in the figure, and dynamic pressure is transferred from the front hole 101 of the airfoil 100 to the side horizontal hole 10.
The static pressure is measured from 2, and the dynamic pressure and static pressure of each airfoil 100 are averaged by an externally provided differential pressure dynamic pressure=ff103 and become the manual power of the differential pressure light 1g machine. Note that the differential pressure obtained from the airfoil 100 is 11 [, which is proportional to the square of the gas flow value in the air volume 104. Therefore, the differential pressure obtained from the actual flow rate ri differential pressure impulse pipe 103 is received by a differential pressure transmitter provided separately.
この差圧発信器の信号を開平演算することによυ得らｎ
る。この装置を風道内に設置することは大きな費用を要
すると共に導圧機構のつまシ等の不具会発生要因がある
のみならず風道通風損失の１つの要因であった。By square rooting the signal of this differential pressure transmitter, υ can be obtained n
Ru. Installing this device in the air duct not only requires a large amount of cost, but also causes problems such as the tabs of the pressure guiding mechanism, and is also one of the causes of ventilation loss in the air duct.
〔発明が解決しようとする間一点」
上韻従米技術でぼ、流量計測用のエア７オイル１００の
設置による風道の流動損失については避けらｎず、シス
テムの雀エネルギー制効率化上問題がめった。[One point while the invention is trying to solve the problem.] With the above technology, flow loss in the wind duct due to the installation of air 7 oil 100 for flow measurement is unavoidable, and there are problems in improving the energy efficiency of the system. Rarely.
本発明の目的は従来、匠遣計測の為に設置していた差圧
発生機構を排除し、他の検出器によるａＪ変速７γンの
流値制御装置を提供することにある。An object of the present invention is to provide a flow value control device with an aJ speed of 7 gamma by eliminating the differential pressure generating mechanism conventionally installed for manual measurement and using another detector.
［１ｔＭ点を解決するための手段」
上記目的は、可変速ファンの吐出圧力を一定値に制御し
た条件下では可変速ファンの吐出流量がファン回転数と
一定の関係で比例することに着目し、ファンＬｇ１転数
信号をファン吐出ｉｔ信号として流値制御装置のフィー
ドバック信号として使用することにより、達成される。[Means for solving the 1tM point] The above objective focuses on the fact that under the condition that the discharge pressure of the variable speed fan is controlled to a constant value, the discharge flow rate of the variable speed fan is proportional to the fan rotation speed in a constant relationship. , is achieved by using the fan Lg1 rotation speed signal as the fan discharge IT signal as a feedback signal of the flow value control device.
可変速ファンの吐出圧力制御Ｉ！４Ｉ疾遭は圧力調節計
の信号により、ファン入口ダンパを誦速で制御し。Variable speed fan discharge pressure control I! In 4I, the fan inlet damper is controlled at the same speed by the signal from the pressure controller.
ファンの吐出圧力を虐に一定値に制御する。Control the fan discharge pressure to a constant value.
この時、ファンの吐出流量はファン回転故に比例する。At this time, the discharge flow rate of the fan is proportional to the rotation of the fan.
この関係よりファンの回転数信号τ７アンの実訛情信号
の代りに使用した流量制御系が（１°ダ成出来ることに
なり、流量信号を作るための大がか）な差圧発生機構が
不要となる。From this relationship, the flow rate control system used in place of the actual variation signal of the fan rotational speed signal τ7 can achieve a difference of 1 degree, which means that the differential pressure generation mechanism used to generate the flow rate signal is quite large. No longer needed.
ｄｉ図は、本発明による可変速ファンによる流ｍ ７１
１１１−系統図である。第１図においてファン１は可変
速電動機や流体継手等の可変速駆動装置２によシ回転数
が変化させられる。ファン１の吸込側にはダンパ操作器
３によってその開度を制御される入口ダンパ４が設けら
れる。吸込側風道よシ吸引され良風はファン１によシ吐
出側風道を通じて需要端へ送風される。吐出側風道には
、ファン圧力発信器５が設置されており、ファン１の吐
出圧力を演出して吐出圧ガに比例した１ご号を発信する
。The di diagram shows the flow m71 caused by the variable speed fan according to the present invention.
111-System diagram. In FIG. 1, the rotational speed of a fan 1 is varied by a variable speed drive device 2 such as a variable speed motor or a fluid coupling. An inlet damper 4 whose opening degree is controlled by a damper operating device 3 is provided on the suction side of the fan 1 . Good air is sucked through the suction side air duct and is blown to the demand end by the fan 1 through the discharge side air duct. A fan pressure transmitter 5 is installed in the discharge side air passage, and it produces the discharge pressure of the fan 1 and transmits a signal proportional to the discharge pressure.
この信号は吐出圧力調節計７に導かれる。吐出圧力調節
計７は吐出圧力に比例しだ信号をファン吐出圧力設定器
６の圧力設定値と比較調節績算し。This signal is guided to the discharge pressure regulator 7. The discharge pressure regulator 7 compares a signal proportional to the discharge pressure with the pressure setting value of the fan discharge pressure setting device 6 and calculates the adjustment results.
し、７°アヘタ゛ンバ４の開度調節をしてファン吐出出
力がｇ時一定値となるようにする。Then, adjust the opening of the 7° adjuster chamber 4 so that the fan discharge output becomes a constant value at g.
一方、ファンに城付けられた回転数発信器８は回転故に
比例した信号を関数発生器９に送る。関数発生器９はフ
ァン回転故の大小に対応した風量信号を出力する。この
風量１８号は風量調節計１１に導かれる。風量調節ｇｔ
ｔｉは、他の制御系よシ発信された風波指令値１０と比
較調ｍ演算し、その調節出力でファン可変速駆動装置２
を介してファン１０回転数を制御して、ファン回転数す
なわちファンの吐出流量を調節する。本発明は、ファン
の吐出圧カ一定値制御を付カロすることにより。On the other hand, a rotation speed transmitter 8 attached to the fan sends a signal proportional to the rotation to a function generator 9. The function generator 9 outputs an air volume signal corresponding to the magnitude of fan rotation. This air volume No. 18 is guided to an air volume controller 11. Air volume adjustment gt
ti is compared with the wind wave command value 10 transmitted from another control system, and the adjustment output is used to control the fan variable speed drive device 2.
The rotation speed of the fan 10 is controlled via the fan 10 to adjust the fan rotation speed, that is, the discharge flow rate of the fan. The present invention provides constant value control of the fan discharge pressure.
ファンの回転数がその流量を代表する関数として扱う事
が出来るようにしたものである。This allows the fan rotation speed to be treated as a function representing the flow rate.
以上のように構成された本発明による可変速ファンの流
量制御ｌＩ％Ｉ装置は、差圧式流量計等を用いた直接流
量計測を風道内に設ｄする必要がないため。The variable speed fan flow rate control device according to the present invention configured as described above does not require direct flow measurement using a differential pressure flow meter or the like in the air passage.
風道内のドラフトロスが少なく、従来装置に比べて、大
巾に所要動力がり１１減され省エネルギーが達成される
。また、使用する検出器１ま圧力と回転故０２つでこれ
らは低い圧力１回転故から高い信号まで元金な＋ｆＬ線
性を・イする１ｇ号が得られるので制（Ｉ１４Ｉ注の良
い制御系が構成ざｎる。There is little draft loss in the wind duct, and compared to conventional equipment, the required power is significantly reduced by 11, achieving energy savings. In addition, since the pressure and rotation of the detector 1 to be used is 02, it is possible to obtain No. 1g which has the basic +fL linearity from a low pressure 1 rotation to a high signal. Configuration.
第２ＬＩＡＶ′ｉＱｆ変速フアンの回転数、圧カーηε
量特性曲線の１例を示す。2nd LIAV′iQf speed change fan rotation speed, pressure curve ηε
An example of a quantity characteristic curve is shown.
回転数は１１Ｊ１＜Ｎ２ ＜ Ｎ３であり例えばＮ１回
転時のファン流４Ｉｔ付吐出圧力の関係は曲線ａ−ｂで
表わ式れている。今ファンの吐出圧力がＰ。で、ｂると
すればｉ’Ｊｔｌ転数時のファン流値はＰｕと曲線ａ
−ｂのクロスポイントａ′に相当する流量軸上のＱ＋
となる事を示している。同様にファンｌｆｉ数Ｎ２時
、Ｎｓ時の７°ｒ）流量はＱ２．Ｑ３の如く回転数に比
例した流量となる。The number of rotations is 11J1<N2<N3, and for example, the relationship between the discharge pressure and the fan flow of 4It at N1 rotation is expressed by a curve a-b. The fan discharge pressure is now P. So, if b is the fan flow value at i'Jtl rotation, Pu and curve a
Q+ on the flow rate axis corresponding to cross point a' of -b
It shows that. Similarly, when the fan lfi number is N2 and Ns, the flow rate is Q2. As shown in Q3, the flow rate is proportional to the rotation speed.
従って、ファンの吐出圧力をいかなる回転数においても
一定値Ｐｏに保持する事により、ファンの流量はその回
転数に比例したものとする事が出来る。Therefore, by maintaining the discharge pressure of the fan at a constant value Po at any rotation speed, the flow rate of the fan can be made proportional to the rotation speed.
以上、詳述したように本発明によれば、流量計を用いな
いで制御性と省エネルギーとの両立を達成した流着制御
装置を提供する事が出来る。As described in detail above, according to the present invention, it is possible to provide a drift control device that achieves both controllability and energy saving without using a flow meter.
１ｉＪ３図は、本発明を火力発電所に適用するときの適
用可能なファンを示したものであり、ボイラ火炉２０に
燃焼用空気を送るための押込ファンＦＦＤＦや１次空気
ファンＰ Ａ １ｉ”、ボイラ火炉２０での燃焼ガスを
排出するための吸込７アンＩＤＦ。Figure 1iJ3 shows applicable fans when the present invention is applied to a thermal power plant, including a forced fan FFDF for sending combustion air to the boiler furnace 20, a primary air fan P A 1i'', A suction 7-amp IDF for discharging combustion gas in the boiler furnace 20.
燃焼ガスの一部をボイラ火炉２０内に戻し排出ガスに含
まれる窒ｇ酸化物のｍ度を制御するためのガス再循環フ
ァンに適用して好適である。なお。It is suitable for application to a gas recirculation fan for returning part of the combustion gas into the boiler furnace 20 and controlling the degree of nitrogen oxides contained in the exhaust gas. In addition.
流量を制御するものであれば、火力発−所以外のファン
にも適用できることは言うまでもないことである。It goes without saying that the present invention can be applied to fans other than thermal power plants as long as the flow rate is controlled.
本発明によれば、風道内に流量を計測する装置をｊ！！
置する必要がないため、風道内の通風損失要因をなくす
ることが出来るなどの経済的効果と回転故に関係なく吐
出圧カ一定の風量を需要側に送風上米る等の効果がある
。According to the present invention, a device for measuring the flow rate is installed in the wind duct! !
Since there is no need to install the pump, there are economical effects such as eliminating the cause of ventilation loss in the air duct, and effects such as blowing a constant amount of air to the demand side with the discharge pressure regardless of the rotation.
第１図は本発明による可変速ファンの制御装置の構成を
示すブロック系統図１ｇ２図は、 ｏＪ変速ファンの回
転数対圧力、流を特性を示す特性図。
第３図は火力発電所煙風道系統図に於けるファンの配置
例、第４図は従来の流量計測用差圧発生器の風量への取
付図を示す。
ｌ・・・ファン、２・・・可変速駆動装置、３・・・ダ
ンパ操作指、４・・・入口ダンパ、５・・・ファン吐出
圧力発信ｄｔ、 ｓ・・・圧力設定器、７・・・圧力調
節計、８・・・回転数発１Ｌ＋器、９・・・関数発生器
、１０・・・風量指令１直。
１１・・・風量調節計。
代理人 弁理士 小川勝男 ゛′−
フ７ンシ先￥ ＣＱ）
第 ３２
１ｆｇ
ＧＲＦ・・・γス再六警須ファン
（ト）FIG. 1 is a block system diagram showing the configuration of a control device for a variable speed fan according to the present invention. FIG. 1g2 is a characteristic diagram showing characteristics of rotation speed versus pressure and flow of an oJ variable speed fan. FIG. 3 shows an example of the arrangement of fans in a smoke and wind duct system diagram of a thermal power plant, and FIG. 4 shows an installation diagram of a conventional differential pressure generator for measuring flow rate to the air volume. l...Fan, 2...Variable speed drive device, 3...Damper operating finger, 4...Inlet damper, 5...Fan discharge pressure transmitter dt, s...Pressure setting device, 7. ...Pressure regulator, 8...Rotation speed generator 1L + device, 9...Function generator, 10...Air volume command 1 shift. 11...Air volume controller. Agent Patent Attorney Katsuo Ogawa ゛'- 7th Anniversary CQ) No. 32 1fg GRF...
Claims (1)
設置されたダンパとから成る通風系統に於いて、ファン
吐出圧力を所定値とすべく前記風道に設けられたファン
入口ダンパの開度を調節し、前記ファンの回転数から、
ファンの吐出圧力を一定値に保持した条件下でのファン
の吐出流量を求め、この吐出流量を所定量とすべく前記
ファンの可変速駆動装置を作動せしめる事を特徴とする
可変速ファンの流量制御装置。1. In a ventilation system consisting of a fan equipped with a variable speed drive device and a damper installed on the fan suction side, the fan inlet damper installed in the air passage is opened in order to maintain the fan discharge pressure at a predetermined value. From the rotation speed of the fan,
Flow rate of a variable speed fan characterized in that the discharge flow rate of the fan is determined under conditions where the discharge pressure of the fan is maintained at a constant value, and a variable speed drive device of the fan is operated to maintain the discharge flow rate at a predetermined amount. Control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61043981A JPH0718428B2 (en) | 1986-03-03 | 1986-03-03 | Variable speed fan flow controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61043981A JPH0718428B2 (en) | 1986-03-03 | 1986-03-03 | Variable speed fan flow controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62202929A true JPS62202929A (en) | 1987-09-07 |
| JPH0718428B2 JPH0718428B2 (en) | 1995-03-06 |
Family
ID=12678894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61043981A Expired - Lifetime JPH0718428B2 (en) | 1986-03-03 | 1986-03-03 | Variable speed fan flow controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0718428B2 (en) |
-
1986
- 1986-03-03 JP JP61043981A patent/JPH0718428B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0718428B2 (en) | 1995-03-06 |
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