JPH0223921Y2 - - Google Patents
Info
- Publication number
- JPH0223921Y2 JPH0223921Y2 JP1983091829U JP9182983U JPH0223921Y2 JP H0223921 Y2 JPH0223921 Y2 JP H0223921Y2 JP 1983091829 U JP1983091829 U JP 1983091829U JP 9182983 U JP9182983 U JP 9182983U JP H0223921 Y2 JPH0223921 Y2 JP H0223921Y2
- Authority
- JP
- Japan
- Prior art keywords
- steam
- boiler
- water
- enthalpy
- recirculation pump
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 43
- 239000012530 fluid Substances 0.000 claims description 8
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- 108010077279 cyclo(lysyl-prolyl-glycyl-prolyl-glycyl-glutamyl-prolyl-glycyl-prolyl-glycyl)cyclo(1epsilon-6-gamma)glycine Proteins 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000010742 number 1 fuel oil Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Landscapes
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Description
【考案の詳細な説明】
〔考案の利用分野〕
本考案はボイラー制御装置に係り、特に、再循
環運転と貫流運転の切替えを円滑に行なう好適な
変圧運転ボイラーのウエツト−ドライ切替制御装
置に関する。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a boiler control device, and particularly to a wet-dry switching control device for a variable pressure boiler that smoothly switches between recirculation operation and once-through operation.
〔考案の背景〕
第1図は変圧運転ボイラーの一例を示す系統図
であり、給水ポンプ1と、給水ポンプ1よりの給
水を加熱する高圧給水ヒータ2と、ボイラよりの
煙道ガスの余熱を利用して給水を予熱する節炭器
3と、節炭器3よりの給水が導入される水冷炉壁
構造を有するボイラ4と、ボイラ4よりの蒸気を
気水分離する気水分離器5と、分離されたボイラ
水を貯水する貯水タンク6と、タンク内の水を節
炭器3に送るボイラ循環ポンプ(BCP)7と、
気水分離器5で分離された飽和蒸気を過熱して過
熱蒸気とする過熱器8と、過熱器8よりの過熱蒸
気を駆動源として回転する高圧タービン9とより
構成されている。[Background of the invention] Figure 1 is a system diagram showing an example of a boiler with variable pressure operation. A boiler 4 having a water-cooled furnace wall structure into which the water supplied from the economizer 3 is introduced, and a steam-water separator 5 that separates steam from the boiler 4 into steam and water. , a water storage tank 6 that stores separated boiler water, and a boiler circulation pump (BCP) 7 that sends water in the tank to the energy saver 3.
It is comprised of a superheater 8 that superheats the saturated steam separated by the steam/water separator 5 to produce superheated steam, and a high-pressure turbine 9 that rotates using the superheated steam from the superheater 8 as a driving source.
以上の構成において、予熱された給水はボイラ
4内で混炭、重油等の燃料によつて加熱され蒸気
が生成される。この蒸気は気水分離器5によつて
気水分離され、ボイラ水は貯水タンク6に送ら
れ、飽和蒸気は過熱器8に送られる。貯水タンク
6の水は高圧給水ヒータ2よりの給水と共に節炭
器3に送られ、一方、過熱器8では飽和蒸気を過
熱して過熱蒸気を生成し高圧タービン9に送出す
る。 In the above configuration, preheated feed water is heated in the boiler 4 with fuel such as mixed coal and heavy oil to generate steam. This steam is separated into steam and water by a steam separator 5, boiler water is sent to a water storage tank 6, and saturated steam is sent to a superheater 8. The water in the water storage tank 6 is sent to the energy saver 3 together with the water supplied from the high-pressure water supply heater 2, while the superheater 8 superheats saturated steam to generate superheated steam and sends it to the high-pressure turbine 9.
第2図は気水分離入口での変圧運転における起
動時のエンタルピー軌跡を示すものであり、ボイ
ラ圧力を上昇させるに従つて特性の昇温昇圧
域、圧力一定のままでエンタルピーが急変する特
性の定圧域、徐々にエンタルピーが増大する特
性の変圧域、ついで圧力一定のままエンタルピ
ーが急変する特性の定圧域を有している。特性
はいわゆるウエツト域であり、この領域では気
水分離器5で分離されたボイラ水がボイラー側に
再循環される。 Figure 2 shows the enthalpy trajectory at startup in variable pressure operation at the steam/water separation inlet, showing the temperature and pressure rising region as the boiler pressure increases, and the characteristic where the enthalpy suddenly changes while the pressure remains constant. It has a constant pressure region, a variable pressure region where the enthalpy gradually increases, and then a constant pressure region where the enthalpy suddenly changes while the pressure remains constant. The characteristic is a so-called wet region, in which boiler water separated by the steam-water separator 5 is recirculated to the boiler side.
ところで、従来におけるウエツト(再循環運
転)−ドライ(貫流運転)切替運転において、定
圧域(特性)から変圧域(特性)に切替えて
ゆく場合、静特性ベース(定常状態)の負荷に達
した時点でBCP7を停止し、貫流に切替えてい
た。しかし、負荷運転中の動特性ベース(過渡状
態)では、必らずしも切替ポイント負荷で、気水
分離器入口エンタルピーが、第2図に図示の点
に一致するのは非常に難かしく、また今日のよう
に燃料カロリー変動や、NOx制御によるガス再
循環量割合によつても切替ポイント負荷で、完全
に湿り度0、即ち図示の点に一致せずに変動す
る(エンタルピーが低くなる)。従つて、ウエツ
トからドライ切替直後、即ちBCP停止直後、第
2図の過熱器8の入口でエンタルピー変化が生
じ、これが、流体温度変動を生じさせ、蒸気温度
制御の外乱となつていた。 By the way, in conventional wet (recirculation operation) - dry (throughflow operation) switching operation, when switching from a constant pressure region (characteristics) to a variable pressure region (characteristics), when the load on a static characteristic basis (steady state) is reached. BCP7 was stopped and switched to once-through flow. However, based on the dynamic characteristics (transient state) during load operation, it is very difficult for the steam/water separator inlet enthalpy to match the point shown in Fig. 2, not necessarily at the switching point load. Also, as seen today, due to fuel calorie fluctuations and the rate of gas recirculation due to NOx control, at the switching point load, the humidity is completely 0, that is, it does not match the point shown in the diagram, but it fluctuates (the enthalpy becomes low). . Therefore, immediately after switching from wet to dry, that is, immediately after BCP is stopped, an enthalpy change occurs at the inlet of the superheater 8 shown in FIG. 2, which causes fluid temperature fluctuations and disturbs steam temperature control.
本考案の目的は、上記した従来の欠点を無く
し、蒸気温度変動を極力低減させてウエツト−ド
ライ切替えを円滑に行なうことのできる変圧運転
ボイラーのウエツト−ドライ切替制御装置を提供
するにある。
The object of the present invention is to provide a wet-dry switching control device for a variable pressure boiler that eliminates the above-mentioned conventional drawbacks, reduces steam temperature fluctuations as much as possible, and allows smooth wet-dry switching.
要するに本考案は、気水分離器入口の流体エン
タルピーが湿り度が零となるところ(気水分離器
入口圧力の飽和温度エンタルピー)と等価になる
までBCPを運転し、一致した時点で運転を停止
するようにしたものである。
In short, the present invention operates the BCP until the fluid enthalpy at the inlet of the steam-water separator becomes equivalent to the point where the wetness becomes zero (saturation temperature enthalpy of the pressure at the steam-water separator inlet), and then stops operation at the point when the fluid enthalpy reaches the same level It was designed to do so.
第3図は本考案の一実施例を示すものであり、
第2図と同一であるものには同一引用数字を用い
たので重複する説明は省略するが、主蒸気流量と
ボイラー再循環流量との割合いを演算する除算器
11と、貯水タンク6内の圧力を検出する圧力検
出器12と、圧力検出器12の検出値と除算器1
1の出力値とを乗算する掛算器13と、圧力検出
器12の出力値に基づいて貯水タンク6の飽和蒸
気エンタルピーとしての関数を発生する関数発生
器14と、関数発生器14の出力値と掛算器13
の出力値との差を演算する減算器15と、減算器
15の偏差が零になつた時点でBCPを停止させ
るための信号を発生するモニター回路16とより
構成される。
FIG. 3 shows an embodiment of the present invention,
The same reference numerals are used for the same parts as in Fig. 2, so redundant explanations will be omitted. A pressure detector 12 that detects pressure, a detected value of the pressure detector 12, and a divider 1
1, a function generator 14 that generates a function as the saturated steam enthalpy of the water storage tank 6 based on the output value of the pressure detector 12, and an output value of the function generator 14. Multiplier 13
, and a monitor circuit 16 that generates a signal to stop the BCP when the deviation of the subtracter 15 becomes zero.
以上の構成において、ボイラー循環運転中の気
水分離器エンタルピーは、除算器11および掛算
器13によつて算出され、一方、湿り度が零のエ
ンタルピーは貯水タンク圧力の飽和蒸気エンタル
ピーとして、関数発生器14により算出される。
従つて、掛算器13の出力信号と関数発生器14
の出力信号の偏差を減算器15で求めることによ
り、偏差が零の時点でモニター回路16を作動さ
せ、この信号はBCP(ボイラ循環ポンプ)7を停
止させる。 In the above configuration, the steam-water separator enthalpy during boiler circulation operation is calculated by the divider 11 and the multiplier 13, while the enthalpy at zero humidity is calculated as the saturated steam enthalpy at the water storage tank pressure. Calculated by the device 14.
Therefore, the output signal of the multiplier 13 and the function generator 14
By determining the deviation of the output signal of , using the subtractor 15, the monitor circuit 16 is activated when the deviation is zero, and this signal causes the BCP (boiler circulation pump) 7 to stop.
すなわち、気水分離器に流入する気水混合流体
流量と、前記ボイラー再循環ポンプによるボイラ
ー再循環量と、前記ボイラー水を貯水するタンク
内圧力値とにより気水分離器のエンタルピーを算
出するとともに、前記タンク内圧力値に基づいて
湿り度0のエンタルピーを算出し、これらのエン
タルピーの偏差が消失したときに前記ボイラー再
循環ポンプを停止させるのである。 That is, the enthalpy of the steam-water separator is calculated based on the flow rate of the steam-water mixed fluid flowing into the steam-water separator, the amount of boiler recirculation by the boiler recirculation pump, and the internal pressure value of the tank storing the boiler water. , the enthalpy at zero humidity is calculated based on the tank internal pressure value, and the boiler recirculation pump is stopped when the enthalpy deviation disappears.
ボイラー循環運転中は、気水混合蒸気を気水分
離器5で、分離させ、かわき蒸気のみを過熱器8
へ送り込む。貫流運転に切替えた場合、BCP7
を停止させると、気水分離器5で、分離されるよ
うな状態にある混合蒸気についても、過熱器8へ
送りこまれるため、BCP7停止直後、かわき蒸
気から湿り蒸気と、一時的な流体エンタルピー変
化が生じて、蒸気温度の変動が生じることにな
る。 During boiler circulation operation, the steam/water mixture is separated by the steam/water separator 5, and only the dry steam is sent to the superheater 8.
send to. When switching to once-through operation, BCP7
When the BCP 7 is stopped, the mixed steam that is being separated in the steam separator 5 is also sent to the superheater 8, so immediately after the BCP 7 is stopped, there is a temporary fluid enthalpy change from dry steam to wet steam. occurs, resulting in fluctuations in steam temperature.
しかし、本考案のように、BCP停止インター
ロツクを流体エンタルピーが、完全にかわくまで
運転し、その後停止させるインターロツク機能を
追加することにより、貫流運転に切替えても
BCPをかならずしも停止させないことにより、
蒸気温度変動が軽減される。因みに、従来では、
このポイントで、蒸気温度が、切替直後、急激に
低下し、この蒸気温度の低下を修正するために燃
料を過剰に投入して蒸気温度を高めていたが、そ
の反動として、蒸気温度が高すぎるという、制御
ハンチングが生じていたものである。 However, as in the present invention, by adding an interlock function that operates the BCP stop interlock until the fluid enthalpy becomes completely dry and then stops, it is possible to switch to once-through operation.
By not necessarily stopping BCP,
Steam temperature fluctuations are reduced. By the way, conventionally,
At this point, the steam temperature suddenly drops immediately after switching, and in order to correct this drop in steam temperature, excessive fuel is injected to raise the steam temperature, but as a reaction, the steam temperature becomes too high. This caused control hunting.
なお、上記制御態様のほか、ボイラー循環運転
中から、貫流へ切替える過程で、水燃比の割合を
補正し、燃料を静的状態よりも多目に投入し、切
替ポイントで、気水分離器入口エンタルピーのか
わき度を上昇させる方法がある。 In addition to the above control mode, in the process of switching from boiler circulating operation to once-through flow, the water-fuel ratio is corrected, more fuel is injected than in the static state, and at the switching point, the water-water separator inlet is There is a way to increase the degree of enthalpy.
又、切替ポイントで、過熱器スプレー流量を調
整し、切替える方法もある。これは、切替ポイン
トで、火炉通過流量を少なくし、気水分離器入口
流体エンタルピーを上昇させるものである。 Another method is to adjust and switch the superheater spray flow rate at a switching point. This is a switching point that reduces the flow rate through the furnace and increases the fluid enthalpy at the water separator inlet.
以上より明らかなように本考案によれば、ウエ
ツトとドライの切替えを蒸気温度の外乱を招くこ
となく行なうことができる。
As is clear from the above, according to the present invention, switching between wet and dry conditions can be performed without causing any disturbance in the steam temperature.
第1図は変圧運転ボイラーの一例を示す系統
図、第2図は気水分離入口における変圧運転の起
動時のエンタルピー軌跡図、第3図は本考案の一
実施例を示すブロツク図である。
3……節炭器、4……ボイラー、5……気水分
離器、6……貯水タンク、7……ボイラ循環ポン
プ、8……過熱器、11……除算器、12……圧
力検出器、13……掛算器、14……関数発生
器、15……減算器、16……モニター回路。
FIG. 1 is a system diagram showing an example of a variable pressure operation boiler, FIG. 2 is an enthalpy locus diagram at the start of variable pressure operation at the steam/water separation inlet, and FIG. 3 is a block diagram showing an embodiment of the present invention. 3... Energy saver, 4... Boiler, 5... Steam water separator, 6... Water storage tank, 7... Boiler circulation pump, 8... Superheater, 11... Divider, 12... Pressure detection 13...Multiplier, 14...Function generator, 15...Subtractor, 16...Monitor circuit.
Claims (1)
して蒸気を生成し、この蒸気を気水分離器で気水
分離し、飽和蒸気を過熱器に送ると共に分離され
たボイラ水を所定時にボイラー再循環ポンプを介
して前記節炭器に戻す変圧運転ボイラシステムに
おいて、気水分離器に流入する気水混合流体流量
と、前記ボイラー再循環ポンプによるボイラー再
循環量と、前記ボイラー水を貯水するタンク内圧
力値とにより気水分離器のエンタルピーを算出す
る演算部と、前記タンク内圧力値に基づいて湿り
度0のエンタルピーを算出する関数発生器と、該
関数発生器の出力値と前記演算部の出力値との偏
差が消失するときに出力信号を発生する減算器
と、該減算器の出力信号に基づいて前記ボイラー
再循環ポンプを停止させる停止インターロツク部
とを具備することを特徴とする変圧運転ボイラー
のウエツト−ドライ切替制御装置。 Feed water introduced through the economizer is heated in a boiler to generate steam, this steam is separated into steam and water in a steam-water separator, and the saturated steam is sent to a superheater and the separated boiler water is sent to the boiler at a predetermined time. In a variable pressure operation boiler system that returns the water to the economizer via a recirculation pump, the flow rate of the steam/water mixed fluid flowing into the steam/water separator, the amount of boiler recirculation by the boiler recirculation pump, and the boiler water are stored. a calculation unit that calculates the enthalpy of the steam-water separator based on the tank internal pressure value; a function generator that calculates the enthalpy of humidity 0 based on the tank internal pressure value; and an output value of the function generator and the calculation unit. and a stop interlock section that stops the boiler recirculation pump based on the output signal of the subtractor, the subtractor generating an output signal when the deviation from the output value of the boiler recirculation pump disappears. Wet/dry switching control device for variable voltage operation boilers.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9182983U JPS602105U (en) | 1983-06-15 | 1983-06-15 | Wet-dry switching control device for variable voltage boiler |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9182983U JPS602105U (en) | 1983-06-15 | 1983-06-15 | Wet-dry switching control device for variable voltage boiler |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS602105U JPS602105U (en) | 1985-01-09 |
JPH0223921Y2 true JPH0223921Y2 (en) | 1990-06-29 |
Family
ID=30221914
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9182983U Granted JPS602105U (en) | 1983-06-15 | 1983-06-15 | Wet-dry switching control device for variable voltage boiler |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS602105U (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0615921B2 (en) * | 1985-01-10 | 1994-03-02 | バブコツク日立株式会社 | Operation control device for transformer once-through boiler |
JPH0820043B2 (en) * | 1986-12-09 | 1996-03-04 | バブコツク日立株式会社 | Once-through boiler operation method |
JPH0418988Y2 (en) * | 1987-12-07 | 1992-04-28 | ||
JPH0269639U (en) * | 1988-11-11 | 1990-05-28 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5697702A (en) * | 1980-01-09 | 1981-08-06 | Hitachi Ltd | Control device of pressure changable operation boiler |
JPS5822804A (en) * | 1981-07-31 | 1983-02-10 | 三菱重工業株式会社 | Controller for temperature of steam in case of pressure change operation |
-
1983
- 1983-06-15 JP JP9182983U patent/JPS602105U/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5697702A (en) * | 1980-01-09 | 1981-08-06 | Hitachi Ltd | Control device of pressure changable operation boiler |
JPS5822804A (en) * | 1981-07-31 | 1983-02-10 | 三菱重工業株式会社 | Controller for temperature of steam in case of pressure change operation |
Also Published As
Publication number | Publication date |
---|---|
JPS602105U (en) | 1985-01-09 |
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