JPH04128395A - Method for injecting gas to inhibit corrosion of boiler pipeline - Google Patents
Method for injecting gas to inhibit corrosion of boiler pipelineInfo
- Publication number
- JPH04128395A JPH04128395A JP24619890A JP24619890A JPH04128395A JP H04128395 A JPH04128395 A JP H04128395A JP 24619890 A JP24619890 A JP 24619890A JP 24619890 A JP24619890 A JP 24619890A JP H04128395 A JPH04128395 A JP H04128395A
- Authority
- JP
- Japan
- Prior art keywords
- value
- oxygen gas
- flow rate
- measured
- condensate
- 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
Links
- 238000000034 method Methods 0.000 title claims description 14
- 238000005260 corrosion Methods 0.000 title claims description 9
- 230000007797 corrosion Effects 0.000 title claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910001882 dioxygen Inorganic materials 0.000 claims abstract description 38
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000001301 oxygen Substances 0.000 claims abstract description 22
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 22
- 238000002347 injection Methods 0.000 claims description 26
- 239000007924 injection Substances 0.000 claims description 26
- 238000010612 desalination reaction Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000001629 suppression Effects 0.000 claims description 2
- 238000011033 desalting Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 238000009835 boiling Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 101150006569 rpsR gene Proteins 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
Landscapes
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、火力発電ボイラのＣＷＴ（２）素ガス及びア
ンモニア注入による腐食抑制手（支）またはＮＷＴ ＠
素ガス注入のみによる腐食抑制手段）における酸素ガス
注入方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention provides CWT (2) corrosion suppression means (support) or NWT @ by injection of raw gas and ammonia for thermal power generation boilers.
This invention relates to a method for injecting oxygen gas in a method for inhibiting corrosion by injecting only raw gas.
従来、ボイラの配管の腐食を抑制するために、配管の内
面に給水中の酸素ガスで酸化被膜を形成させることが提
案されている。例えば原子力発電の沸騰水型原子炉の炉
水処理では、ＮＷＴが既に実施されている。このＮＷＴ
では、予め定めた酸素ガス注入流量を、調整弁で調整し
ている。Conventionally, in order to suppress corrosion of boiler piping, it has been proposed to form an oxide film on the inner surface of the piping using oxygen gas in water supply. For example, NWT has already been implemented in the reactor water treatment of boiling water reactors for nuclear power generation. This N.W.T.
In this case, a predetermined oxygen gas injection flow rate is adjusted by a regulating valve.
しかしながら、火力発電ボイラの水処理では、ＣＷＴ、
ＮＷＴの何れも行われていない。However, in water treatment for thermal power boilers, CWT,
None of the NWT is being done.
第３図は火力発電ボイラの水循環系路を示す模試図であ
る。核間において、ボイラｌで発生した蒸気は過熱器２
で加熱された後タービン３に供給されてタービン３を回
転させる。該タービン３の回転により発電機４が回転し
発電する。タービン３でエネルギーが消費された蒸気は
復水器５で凝縮される。該復水器５には循環水（２次水
）が消失される分の水（１次水）を補給するための補給
水路６が配備されている。そして復水器５の水（復水）
は脱塩装置！７に送給され脱塩（純水化）された後、低
圧給水加熱器８で加熱さ汰脱気器９で脱気さ汰さらに高
圧給水加熱器１０で加熱さねへ節炭器１１を経て給水と
して再びボイラ１に供給される。Figure 3 is a mock diagram showing the water circulation system of a thermal power boiler. Between the cores, the steam generated in boiler 1 is transferred to superheater 2.
After being heated, it is supplied to the turbine 3 and rotates the turbine 3. The rotation of the turbine 3 causes the generator 4 to rotate and generate electricity. The steam whose energy has been consumed in the turbine 3 is condensed in the condenser 5. The condenser 5 is provided with a replenishment waterway 6 for replenishing the amount of water (primary water) that is lost in the circulating water (secondary water). And the water in condenser 5 (condensate)
is a desalination device! After the water is desalinated (purified), it is heated in a low-pressure feed water heater 8, degassed in a deaerator 9, and then heated in a high-pressure feed water heater 10. The water is then supplied to the boiler 1 again as feed water.
このように従来の火力発電ボイラの水循環系では酸素ガ
スを注入するということは行われておらず、反対に脱酸
素が行われている。As described above, in the water circulation system of a conventional thermal power boiler, oxygen gas is not injected, but on the contrary, oxygen is removed.
第２図は沸騰水型原子炉の炉水処理で行われているＮＷ
Ｔの＄１８１１方法を示す図である。核間において、復
水母管１２ （または給水母管）に注入する酸素ガス注
入流量を酸素ガス流量発信器１３によって測定し、ここ
で得られる測定値を調節計１４に供給して、ここで予め
設定されているガス注入流量目標値と比較し、この比較
結果に応じて発生する出力により、注入流量調整弁１５
の開度を調節し、復水母管１２の酸素ガス注入部１２ａ
における酸素ガス注入流量を制御する。Figure 2 shows the NW used in reactor water treatment for boiling water reactors.
It is a diagram showing T's $1811 method. Between the cores, the oxygen gas injection flow rate to be injected into the condensate main pipe 12 (or water supply main pipe) is measured by the oxygen gas flow rate transmitter 13, and the measured value obtained here is supplied to the controller 14, where it is preliminarily determined. The injection flow rate adjustment valve 15 is compared with the set gas injection flow rate target value, and the output generated according to the comparison result
The opening degree of the oxygen gas injection part 12a of the condensate main pipe 12 is adjusted.
Control the oxygen gas injection flow rate at
〔発明が解決しようとする間上記
ところがこの場合、酸素ガス注入流量は常に一定となる
ため、プラント負荷変動に代表される給水及び復水流量
変動に対して注入量が追従せず、溶存酸素濃度を一定に
保つことができないという問題かあった。[While the invention is trying to solve the above problem, in this case, the oxygen gas injection flow rate is always constant, so the injection amount does not follow fluctuations in the supply water and condensate flow rates, which are typified by plant load fluctuations, and the dissolved oxygen concentration increases. There was a problem that it was not possible to maintain a constant value.
本発明はこのような事情に鑑みてなされたもので、その
目的は給水・復水流量に変動があっても溶存酸素濃度を
目的値に常時一定に保持し、配管内面に強固な酸化被膜
を形成することを可能とした酸素ガス注入方法を提供す
ることである。The present invention was developed in view of the above circumstances, and its purpose is to maintain the dissolved oxygen concentration at a constant target value even if there are fluctuations in the flow rate of water supply and condensate, and to form a strong oxide film on the inner surface of the piping. An object of the present invention is to provide an oxygen gas injection method that makes it possible to form an oxygen gas.
〔課題を解決するための手則
このために本発明は、給復水系の流水量の測定値に応じ
た比例値と、上記給復水系の流水の溶存酸素濃度の測定
値を目標値と比較して発生する出力値との加算値に応じ
て酸素ガス注入量を制御するようにした。[Methods for solving the problem] To this end, the present invention compares a proportional value according to the measured value of the flow rate of the water supply and condensate system with a target value of the measured value of the dissolved oxygen concentration of the water flowing in the water supply and condensate system. The amount of oxygen gas injected is controlled according to the added value to the output value generated.
演施例〕
以下、本発明の一実施例のボイラ配管の腐食抑制におけ
る酸素ガス注入方法について説明する。Example] Hereinafter, an oxygen gas injection method for suppressing corrosion of boiler piping according to an example of the present invention will be described.
第１図において、復水母管１６を流通する復水の流量を
流量発信器１７で測定し、その測定値を比率設定器１８
によって比例値として検出する。In FIG. 1, the flow rate of condensate flowing through the condensate main pipe 16 is measured by a flow rate transmitter 17, and the measured value is sent to a ratio setting device 18.
is detected as a proportional value.
一方、脱気器入口１９の溶存酸素濃度を溶存酸素計２０
で測定する。この測定値を調節計２１において、予め設
定されている水質目標値と比較演算する。この演算値と
上記設定ｒｓ１８で検出した給水流量の検出値とを加算
演算器２２において加算し、その加算値伽算演算器２２
の出力値）を酸素ガス注入流量目標値とする。そしてこ
の目標値と酸素ガス流量発信器２３で測定した復水母管
１６への酸素ガス流量測定値とを調節計２４において比
較演算し、その出力値によって、脱塩装置出口２６に備
えた酸素ガス注入流量調節弁２５の開度を調節する。On the other hand, the dissolved oxygen concentration at the deaerator inlet 19 is measured by the dissolved oxygen meter 20.
Measure with. The controller 21 compares and calculates this measured value with a preset water quality target value. This calculated value and the detected value of the water supply flow rate detected in the setting rs18 are added in the addition calculator 22, and the sum is subtracted by the addition calculator 22.
output value) is set as the oxygen gas injection flow rate target value. Then, this target value and the measured value of the oxygen gas flow rate to the condensate main pipe 16 measured by the oxygen gas flow rate transmitter 23 are compared and calculated in the controller 24, and based on the output value, the oxygen gas provided at the desalination equipment outlet 26 is calculated. The opening degree of the injection flow rate control valve 25 is adjusted.
かくして酸素ガス注入部２６から復水の流量及び水質（
溶存酸素）の変動に係わらず、常時溶存酸素を一定値と
するため最も目標値に適合した酸素ガス注入が自動的に
できる。In this way, the flow rate and water quality of condensate from the oxygen gas injection part 26 (
Regardless of fluctuations in dissolved oxygen (dissolved oxygen), dissolved oxygen is always kept at a constant value, so oxygen gas can be automatically injected to best match the target value.
なお、上記実施例では復水の流量と溶存酸素を検出する
ようにしたが、これに代えて給水の流量と溶存酸素を検
出して行うこともできる。また、溶存酸素濃度測定位置
及び酸素ガス注入部の位置は上記の位置に限定するもの
ではない。In the above embodiment, the flow rate of condensate water and dissolved oxygen are detected, but the flow rate and dissolved oxygen of feed water may be detected instead. Further, the position for measuring the dissolved oxygen concentration and the position of the oxygen gas injection part are not limited to the above-mentioned positions.
また、本発明では脱気器は不要となるため脱気器を備え
るシステムに通用した場合は、脱気器の運転を停止させ
ておくことは勿論である。Further, since the present invention does not require a deaerator, if the present invention is applicable to a system equipped with a deaerator, the operation of the deaerator can of course be stopped.
〔発明の効果〕
以上から本発明によれば、酸素ガス注入量が給復水流量
に追従するので、給水中の溶存酸素濃度が常に一定とな
る。さらに溶存酸素濃度と、水質目標値を比較演算し、
注入流量の補正として加えているので、最終的に溶存酸
素濃度をより高精度で目的値に適合するようにコントロ
ールすることができる。[Effects of the Invention] As described above, according to the present invention, since the amount of oxygen gas injected follows the flow rate of the feed water and condensate, the dissolved oxygen concentration in the feed water is always constant. Furthermore, the dissolved oxygen concentration and water quality target value are compared and calculated.
Since it is added as a correction to the injection flow rate, it is possible to ultimately control the dissolved oxygen concentration to match the target value with higher accuracy.
第１図は本発明の一実施例の酸素ガス注入方法を示す説
明図、第２図は沸騰水型原子炉のＮＷＴの＠御方法を示
す説明図、第３図は火力発電ボイラの水循環系路を示す
模試図である。
１６・・・復水母管、１７・−・流量発信器、１８・・
・比率設定器、１９・・・脱気器入口、２０・・・溶存
酸素計、２１・・・調節針、２２・・・加算演算器、２
３・・・酸素ガス流量発信器、２４・・・調節計、２５
・・・酸素ガス注入流量調節弁、２６・・・酸素ガス注
入部。Fig. 1 is an explanatory diagram showing an oxygen gas injection method according to an embodiment of the present invention, Fig. 2 is an explanatory diagram showing a method for controlling NWT in a boiling water reactor, and Fig. 3 is a water circulation system of a thermal power boiler. This is a mock diagram showing the route. 16... Condensate main pipe, 17... Flow rate transmitter, 18...
・Ratio setting device, 19... Deaerator inlet, 20... Dissolved oxygen meter, 21... Adjustment needle, 22... Addition calculator, 2
3...Oxygen gas flow rate transmitter, 24...Controller, 25
...Oxygen gas injection flow rate control valve, 26...Oxygen gas injection part.
Claims (4)
への酸素ガス注入方法において、上記給復水系の流水量
の測定値に応じた比例値と、上記給復水系の流水の溶存
酸素濃度の測定値を目標値と比較して発生する出力値と
の加算値に応じて酸素ガス注入量を制御するようにした
ことを特徴とするボイラ配管の腐食抑制における酸素ガ
ス注入方法。(1) In the method of injecting oxygen gas into the water supply and condensate system to form an oxide film on boiler piping, a proportional value according to the measured value of the flow rate of the water supply and condensate system, and dissolved oxygen in the water flowing through the water supply and condensate system. An oxygen gas injection method for suppressing corrosion of boiler piping, characterized in that the amount of oxygen gas injection is controlled according to an added value of an output value generated by comparing a measured concentration value with a target value.
ようにしたことを特徴とする特許請求の範囲第１項記載
のボイラ配管の腐食抑制における酸素ガス注入方法。(2) The oxygen gas injection method for suppressing corrosion of boiler piping according to claim 1, characterized in that the added value is applied to an oxygen gas injection flow rate regulating valve.
ことを特徴とする特許請求の範囲第１項または第２項記
載のボイラ配管の腐食抑制における酸素ガス注入方法。(3) An oxygen gas injection method for suppressing corrosion of boiler piping according to claim 1 or 2, characterized in that the oxygen gas injection is provided at an outlet of a condensate desalination device.
において測定するようにしたことを特徴とする特許請求
の範囲第１項乃至第３項記載のボイラ配管の腐食抑制に
おける酸素ガス注入方法。(4) Oxygen gas injection for corrosion suppression of boiler piping according to claims 1 to 3, characterized in that the dissolved oxygen concentration is measured at the inlet of the deaerator or the inlet of the economizer. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24619890A JPH04128395A (en) | 1990-09-18 | 1990-09-18 | Method for injecting gas to inhibit corrosion of boiler pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24619890A JPH04128395A (en) | 1990-09-18 | 1990-09-18 | Method for injecting gas to inhibit corrosion of boiler pipeline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04128395A true JPH04128395A (en) | 1992-04-28 |
Family
ID=17144970
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24619890A Pending JPH04128395A (en) | 1990-09-18 | 1990-09-18 | Method for injecting gas to inhibit corrosion of boiler pipeline |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04128395A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011007640A (en) * | 2009-06-26 | 2011-01-13 | Shikoku Electric Power Co Inc | Continuous concentration measuring apparatus and method |
| US8111827B2 (en) | 2009-01-16 | 2012-02-07 | Fujitsu Limited | Cryptographic processing apparatus and cryptographic processing method |
-
1990
- 1990-09-18 JP JP24619890A patent/JPH04128395A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8111827B2 (en) | 2009-01-16 | 2012-02-07 | Fujitsu Limited | Cryptographic processing apparatus and cryptographic processing method |
| JP2011007640A (en) * | 2009-06-26 | 2011-01-13 | Shikoku Electric Power Co Inc | Continuous concentration measuring apparatus and method |
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