JPH0551801B2 - - Google Patents
Info
- Publication number
- JPH0551801B2 JPH0551801B2 JP33097589A JP33097589A JPH0551801B2 JP H0551801 B2 JPH0551801 B2 JP H0551801B2 JP 33097589 A JP33097589 A JP 33097589A JP 33097589 A JP33097589 A JP 33097589A JP H0551801 B2 JPH0551801 B2 JP H0551801B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- water supply
- water
- boiler
- pipe
- 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 - Lifetime
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 97
- 239000000446 fuel Substances 0.000 claims description 5
- 239000008400 supply water Substances 0.000 claims description 4
- 230000007797 corrosion Effects 0.000 description 13
- 238000005260 corrosion Methods 0.000 description 13
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Landscapes
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Description
【発明の詳細な説明】
＜産業上の利用分野＞
この発明はボイラ装置、特に節炭器の低温腐食
を防止する手段を設けたボイラ装置に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a boiler system, and particularly to a boiler system provided with a means for preventing low-temperature corrosion of an economizer.
＜従来の技術及びその問題点＞
ボイラを構成する部材については硫黄分を含有
する燃料を使用するときは排ガス中に亜硫酸ガス
（SO3）を含むこととなり、この排ガスが低温部
材に接触するときその含有する蒸気は露点に達し
凝縮しこれにSO3が溶け込み硫酸となりその部材
を腐食し、事故に発展するものである。このよう
な部材としては空気予熱器、節炭器、ダクトを形
成する鋼板等が該当するものであることは知られ
ている。このうち圧力をもつ給水を加熱する節炭
器の伝熱管に腐食により漏水を生ずるときは運転
停止をして休缶し節炭器の補修または交換させね
ばならぬという問題がある。<Prior art and its problems> When using fuel containing sulfur in the parts that make up a boiler, the exhaust gas contains sulfur dioxide gas (SO 3 ), and when this exhaust gas comes into contact with low-temperature parts. The steam it contains reaches its dew point and condenses, and SO 3 dissolves into it to form sulfuric acid, which corrodes the parts and leads to an accident. It is known that such members include air preheaters, energy savers, steel plates forming ducts, and the like. Among these problems, when water leaks due to corrosion in the heat exchanger tubes of the energy saver that heats the pressurized water supply, there is a problem in that the operation must be shut down, the tank shut down, and the energy saver repaired or replaced.
第１図は炭素鋼チユーブで内部に給水が流れて
いる場合において、重油燃料中の硫黄含有量
（％）を横軸とし縦軸に腐食防止最低チユーブメ
タル温度をとつたときの線図である。チユーブメ
タル温度は伝熱管内にスケールのない場合はほぼ
管内流体の温度と考えてよい。曲線イは重油燃焼
ボイラの場合で燃料中にバナジウムを含まぬ場合
の腐食防止最低チユーブメタル温度を示し、曲線
ロは燃焼残渣（灰分）中に含有するバナジウムが
約3.5％の場合の腐食防止最低チユーブメタル温
度を示す。 Figure 1 is a diagram of a carbon steel tube with feed water flowing inside, with the horizontal axis representing the sulfur content (%) in heavy oil fuel and the vertical axis representing the minimum tube metal temperature for preventing corrosion. . If there is no scale inside the heat transfer tube, the tube metal temperature can be considered to be approximately the temperature of the fluid inside the tube. Curve A shows the minimum tube metal temperature for preventing corrosion when the fuel does not contain vanadium in the case of a heavy oil-fired boiler, and curve B shows the minimum temperature for preventing corrosion when the combustion residue (ash) contains approximately 3.5% vanadium. Indicates tube metal temperature.
この第１図よりも明かなごとく、流体（給水）
の温度をこの曲線より高い処にする必要がある。 As is clearer from this Figure 1, fluid (water supply)
It is necessary to set the temperature to a point higher than this curve.
従来のボイラにおいてはこのような低温腐食を
防止するため給水温度を上昇させる手段として給
水加熱器又は加熱形脱気器を設けるなどしていた
が設備費が大きいものとなるという問題がある。 In conventional boilers, in order to prevent such low-temperature corrosion, a feed water heater or heating type deaerator is installed as a means to increase the feed water temperature, but there is a problem in that the equipment cost is high.
本願発明者等は先に特開昭58−164907号公報で
節炭器の低温腐食を防止する完全自動制御型のボ
イラを提案した。 The inventors of the present application previously proposed a completely automatically controlled boiler that prevents low-temperature corrosion of the economizer in Japanese Patent Application Laid-Open No. 58-164907.
その第３図に示すごとく、主給水流量計６、温
度発信器１６，１８、排ガス温度計２１、の信号
及び図示しないドラム水位発信器の信号は主制御
箱２０に送られ、その主制御箱からの信号で主給
水流量制御弁５、再循環量調節弁１２、バイパス
調節弁９が調節されている。 As shown in FIG. 3, signals from the main water supply flow meter 6, temperature transmitters 16 and 18, exhaust gas thermometer 21, and signals from a drum water level transmitter (not shown) are sent to the main control box 20. The main water supply flow rate control valve 5, the recirculation amount control valve 12, and the bypass control valve 9 are controlled by signals from the main water supply water flow rate control valve 5.
従つて節炭器入口の給水の温度は、接続部８ａ
から分岐し給水バイパス管路８に流れる水量を、
ボイラ給水ポンプ４の給水量から差し引いた量
に、接続部１０ａでの温度の高い再循環給水と混
合させて始めてその温度が決まるので、その応答
はやや遅いうらみがある。 Therefore, the temperature of the supply water at the inlet of the economizer is equal to that at the connection part 8a.
The amount of water that branches from the water supply bypass pipe 8 and flows into the water supply bypass pipe 8 is
Since the temperature is determined only after the amount subtracted from the water supply amount of the boiler feed water pump 4 is mixed with the high temperature recirculated water supply water at the connection part 10a, the response is somewhat slow.
またこれらの自動調節弁は高価であり、より費
用の掛からぬ簡便な装置が要望されていた。 Furthermore, these automatic control valves are expensive, and a simpler device that is less expensive has been desired.
この発明は簡単な給水のバイパス管路と再循環
管路を主給水管路につき設けてこの問題を解決す
るものである。 The present invention solves this problem by providing a simple feedwater bypass line and recirculation line for the main water supply line.
＜発明の目的＞
この発明はこのような低温腐食を生ずることな
くかつ既設のボイラにも適用でき、また管路等の
増設により容易にボイラ装置の改造ができ、しか
も新設ボイラにおいては給水加熱器、加熱形脱気
器等を使用することなく節炭器の低温腐食を防止
したボイラの構造を提案することを目的とする。<Purpose of the invention> The present invention can be applied to existing boilers without causing such low-temperature corrosion, and the boiler equipment can be easily modified by adding pipes, etc. Moreover, in new boilers, the feed water heater The purpose of this study is to propose a boiler structure that prevents low-temperature corrosion of the economizer without using a heating deaerator or the like.
＜手段の概要＞
要するにこの発明は、ボイラの給水管路に設け
た節炭器の入口側管路と出口側管路とを弁付き給
水バイパス管路と弁付き再循環管路とで接続した
節炭器低温腐食防止型のボイラ装置において、前
記２つの弁を手動調節弁とし、給水バイパス管路
８と給水管３ａとの接続部８ａと、給水再循環管
路１０と給水管路３ａとの接続部１０ａとの間に
給水温度調節弁１２を設け、前記接続部１０ａの
下流に再循環ポンプ１１と給水温度発信器１６を
順に設け、該給水温度発信器１６の温度信号を受
ける給水温度調節器１７の信号で前記給水温度調
節弁１２を制御する信号回路１８を設けたことを
特徴とするボイラ装置である。<Summary of Means> In short, this invention connects the inlet side pipe and the outlet side pipe of the energy saver provided in the water supply pipe of the boiler with a valved water supply bypass pipe and a valved recirculation pipe. In a low-temperature corrosion prevention type boiler device, the two valves are manual control valves, and a connection part 8a between the water supply bypass pipe 8 and the water supply pipe 3a, a connection part 8a between the water supply bypass pipe 8 and the water supply pipe 3a, and a connection part 8a between the feed water recirculation pipe 10 and the water supply pipe 3a. A feed water temperature control valve 12 is provided between the connecting portion 10a of the connecting portion 10a, and a recirculation pump 11 and a feed water temperature transmitter 16 are sequentially provided downstream of the connecting portion 10a, and the feed water temperature control valve receives the temperature signal from the feed water temperature transmitter 16. This boiler apparatus is characterized by being provided with a signal circuit 18 that controls the feed water temperature control valve 12 using a signal from a regulator 17.
＜実施例＞
第２図はこの発明の一実施例を示す管系統図で
ある。ボイラ１への給水は給水タンク２より各部
材を接続して主給水系を形成する主給水管路３に
順に設けたボイラ給水ポンプ４、主給水流量制御
弁５、主給水流量計６を経て符号８ａで示す箇所
にて一部は節炭器７を経由、一部は節炭器７をバ
イパスし手動調節弁９を有する管路８を経由し符
号８ｂに示す箇所で合流し、ボイラの上胴１ａに
供給される。<Embodiment> FIG. 2 is a pipe system diagram showing an embodiment of the present invention. Water is supplied to the boiler 1 from a water supply tank 2 through a boiler feed water pump 4, a main water flow rate control valve 5, and a main water flow meter 6, which are installed in this order in a main water supply pipe 3 that connects each member to form a main water supply system. A portion of the water passes through the economizer 7 at a point 8a, and a portion bypasses the economizer 7 and passes through a conduit 8 having a manual control valve 9, and joins the boiler at a location 8b. It is supplied to the upper body 1a.
この発明においては上記系路の他管路３ａの主
給水流量制御弁５、主給水流量計６の後流に温度
検出センサ１６を伴う給水温度調節器１７に制御
される給水温度調節弁１２、再循環ポンプ１１を
順に設けるとともに、節炭器出口管路３６の符号
１０ｂの箇所より給水温度調節弁１２と再循環ポ
ンプ１１を接続する管路の符号１０ａに示す箇所
に接続される手動調節弁２３を有する給水再循環
管路１０を配し、運転中は節炭器７を出た給水を
ほぼ定量再循環する。 In this invention, the main feed water flow rate control valve 5 of the other pipe line 3a of the system, the feed water temperature control valve 12 controlled by the feed water temperature regulator 17 with a temperature detection sensor 16 downstream of the main feed water flow meter 6, The recirculation pumps 11 are installed in sequence, and a manual control valve is connected from the point 10b of the economizer outlet pipe 36 to the point 10a of the pipe connecting the feed water temperature control valve 12 and the recirculation pump 11. A feedwater recirculation line 10 with 23 is provided, which recirculates the feedwater leaving the economizer 7 almost quantitatively during operation.
ボイラの負荷に応じ節炭器７の出口給水温度は
変化するが節炭器入口給水温度は給水温度発信器
１６の信号を受ける給水温度調節器１７の指令信
号１８により制御される給水温度調節弁１２が作
動し、あらかじめ設定した低温腐食防止可能な温
度を維持する応答が速い。 The feed water temperature at the outlet of the economizer 7 changes depending on the load of the boiler, but the feed water temperature at the inlet of the economizer is controlled by the command signal 18 of the feed water temperature regulator 17 which receives a signal from the feed water temperature transmitter 16. 12 is activated and has a fast response to maintain a preset temperature capable of preventing low temperature corrosion.
節炭器７入口給水温度を制御のため給水温度調
節弁１２から供給された給水は節炭器７を経由し
て管路３６の符号８６の箇所で節炭器７をバイパ
スする管路８からの給水と合流してボイラの上胴
１ａに供給される。 In order to control the temperature of the feed water at the inlet of the economizer 7, the water supplied from the water supply temperature control valve 12 passes through the economizer 7 and is transferred from the conduit 8 that bypasses the economizer 7 at a point 86 in the conduit 36. The water is combined with the water supplied to the boiler and supplied to the upper shell 1a of the boiler.
＜発明の効果＞
この発明を実施した結果の一例を数値により以
下に述べる。ボイラ給水ポンプ入口温度80℃、給
水量（蒸発量）を37t／ｈとするとき、給水再循
環量を手動調節弁２３により約25t／ｈに調節設
定しボイラの負荷状態から節炭器出口給水温度が
143℃になる場合、給水温度調節計の設定を低温
腐食防止の130℃にすると給水温度調節弁１２よ
り15.4t／ｈの給水が供給されることになり、こ
の15.4t／ｈは節炭器を経由後節炭器バイパス系
から供給される21.6t／ｈの給水と合流し106℃の
給水としてボイラ１の上胴１ａに供給される。ボ
イラ負荷状態により節炭器出口の給水（再循環
水）温度は変化するが節炭器入口温度は給水温度
調節弁１２により常に一定に保たれる。またボイ
ラへ必要な給水の総量は主給水流量制御弁５によ
り規制されているため給水温度調節弁からの給水
量に応じ節炭器バイパス系の給水量は手動調節弁
９の抵抗により自然に増減する。<Effects of the Invention> An example of the results of implementing this invention will be described below using numerical values. When the boiler feed water pump inlet temperature is 80℃ and the water supply amount (evaporation amount) is 37 t/h, the feed water recirculation amount is adjusted to approximately 25 t/h using the manual control valve 23, and the water saver outlet water supply is adjusted based on the boiler load condition. temperature
When the temperature reaches 143℃, if the water supply temperature controller is set to 130℃ to prevent low-temperature corrosion, 15.4t/h of water will be supplied from the water supply temperature control valve 12, and this 15.4t/h will be supplied by the energy saving device. After passing through the water, it joins with 21.6 t/h of water supplied from the economizer bypass system and is supplied to the upper shell 1a of the boiler 1 as 106°C water. Although the temperature of the feed water (recirculated water) at the outlet of the economizer changes depending on the boiler load condition, the temperature at the inlet of the economizer is always kept constant by the feed water temperature control valve 12. In addition, the total amount of water supplied to the boiler is regulated by the main water supply flow rate control valve 5, so the amount of water supplied to the energy saver bypass system will naturally increase or decrease depending on the amount of water supplied from the water supply temperature control valve due to the resistance of the manual control valve 9. do.
この発明を実施することにより低温の給水しか
得られぬ場合でも低温腐食を防止可能となり、給
水温度調節弁１２の制御は給水温度調節器１７の
信号回路１８よりの信号のみでされ、給水タンク
２からの冷たい水の節炭器への供給量はこの弁で
直接的にされる。加えて温度の高い再循環水はこ
の弁の下流の供給部１０ａに供給され、この下流
に再循環ポンプ１１が設けられているので、冷水
と高温の再循環水の混合はこの再循環ポンプ内で
瞬時にされ、節炭器の入口給水温度を迅速かつ正
確に制御することができる。ボイラを高効率で使
用することができる。 By carrying out this invention, it is possible to prevent low temperature corrosion even when only low temperature water is available, and the feed water temperature control valve 12 is controlled only by the signal from the signal circuit 18 of the feed water temperature regulator 17, and the feed water tank 2 The supply of cold water from the to the economizer is done directly with this valve. In addition, high temperature recirculation water is supplied to the supply section 10a downstream of this valve, and a recirculation pump 11 is provided downstream of this, so that the mixing of cold water and high temperature recirculation water is carried out within this recirculation pump. The inlet water temperature of the economizer can be controlled quickly and accurately. Boilers can be used with high efficiency.
第１図は低温腐食を起さないための鋼管のメタ
ル温度と燃料中の硫黄含有量との関係を示す線
図、第２図は本発明の一実施例にかかるボイラ装
置の管系統図である。
１……ボイラ、３……主給水管路、３ａ，３ｂ
……管路、８……給水バイパス管路、９……手動
調節弁、１０……給水再循環管路、１１……再循
環ポンプ、１２……給水温度調節弁、１６……給
水温度発信器、１７……給水温度調節器、２３…
…手動調節弁。
Fig. 1 is a diagram showing the relationship between the metal temperature of steel pipes and the sulfur content in the fuel to prevent low-temperature corrosion, and Fig. 2 is a pipe system diagram of a boiler device according to an embodiment of the present invention. be. 1...Boiler, 3...Main water supply pipe, 3a, 3b
... Pipeline, 8 ... Water supply bypass pipe line, 9 ... Manual control valve, 10 ... Water supply recirculation pipe line, 11 ... Recirculation pump, 12 ... Water supply temperature control valve, 16 ... Water supply temperature transmission device, 17... water supply temperature regulator, 23...
...Manual control valve.
Claims (1)
路と出口側管路とを弁付き給水バイパス管路と弁
付き再循環管路とで接続した節炭器低温腐食防止
型のボイラ装置において、前記２つの弁を手動調
節弁とし、給水バイパス管路８と給水管路３ａと
の接続部８ａと、給水再循環管路１０と給水管路
３ａとの接続部１０ａとの間に給水温度調節弁１
２を設け、前記接続部１０ａの下流に再循環ポン
プ１１と給水温度発信器１６を順に設け、該給水
温度発信器１６の温度信号を受ける給水温度調節
器１７の信号で前記給水温度調節弁１２を制御す
る信号回路１８を設けたことを特徴とするボイラ
装置。1. A low-temperature corrosion-preventing boiler with a fuel saver in which the inlet and outlet pipes of the energy saver installed in the water supply pipe of the boiler are connected by a valved water supply bypass pipe and a valved recirculation pipe. In the device, the two valves are manual control valves, and between the connection part 8a between the water supply bypass pipe 8 and the water supply pipe 3a and the connection part 10a between the water supply recirculation pipe 10 and the water supply pipe 3a. Supply water temperature control valve 1
2, and a recirculation pump 11 and a feed water temperature transmitter 16 are sequentially provided downstream of the connection part 10a, and the feed water temperature control valve 12 is controlled by a signal from a feed water temperature regulator 17 that receives a temperature signal from the feed water temperature transmitter 16. A boiler device characterized by being provided with a signal circuit 18 for controlling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33097589A JPH02272205A (en) | 1989-12-19 | 1989-12-19 | Boiler device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33097589A JPH02272205A (en) | 1989-12-19 | 1989-12-19 | Boiler device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4461082A Division JPS58164907A (en) | 1982-03-23 | 1982-03-23 | Boiler device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02272205A JPH02272205A (en) | 1990-11-07 |
| JPH0551801B2 true JPH0551801B2 (en) | 1993-08-03 |
Family
ID=18238441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33097589A Granted JPH02272205A (en) | 1989-12-19 | 1989-12-19 | Boiler device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02272205A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4950324B2 (en) * | 2010-06-29 | 2012-06-13 | 株式会社桜井技術研究所 | Waste heat recovery system |
| CN106461206B (en) * | 2014-04-28 | 2020-04-10 | 通用电器技术有限公司 | System and method for preheating a fluid medium |
-
1989
- 1989-12-19 JP JP33097589A patent/JPH02272205A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02272205A (en) | 1990-11-07 |
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