JPH08200607A - Overheat preventing method for water tube of boiler - Google Patents
Overheat preventing method for water tube of boilerInfo
- Publication number
- JPH08200607A JPH08200607A JP2608595A JP2608595A JPH08200607A JP H08200607 A JPH08200607 A JP H08200607A JP 2608595 A JP2608595 A JP 2608595A JP 2608595 A JP2608595 A JP 2608595A JP H08200607 A JPH08200607 A JP H08200607A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- water
- tube
- water pipe
- controller
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims description 5
- 230000002265 prevention Effects 0.000 claims description 11
- 238000013021 overheating Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 abstract description 5
- 239000000567 combustion gas Substances 0.000 abstract description 2
- 229920006395 saturated elastomer Polymers 0.000 abstract description 2
- 238000002485 combustion reaction Methods 0.000 description 6
- 239000000446 fuel Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Landscapes
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、ボイラ用水管の過熱
を防止する方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing overheating of a boiler water pipe.
【０００２】[0002]
【従来の技術】従来、ボイラ用水管の安全装置としての
過熱防止手段は、水管上方部に温度センサを設けるとと
もに水管材料の耐熱限界温度（例えば６００℃）を設定
し、前記温度センサが前記耐熱限界温度を検出すればボ
イラは警報を発し停止するようにしている。しかしなが
ら、図４に示す水管２１のように、通常は缶水が沸騰し
水管２１の上部まで到達して水管２１の過熱を防止して
いるが、高圧時にバーナを停止した場合には沸騰があま
りなく、図５の水管２１のように缶水が約半分くらいと
なり、耐火材２２の蓄熱で水管２１の上部が前記耐熱限
界温度近くまで過熱することがある。このように水管材
料の耐熱限界温度までは達してはいないが、通常の水管
温度よりもかなり過熱し高温になっているため、過熱に
起因する熱応力によって水管２１が金属疲労から劣化す
ることがある。2. Description of the Related Art Conventionally, overheat preventing means as a safety device for a boiler water pipe is provided with a temperature sensor above the water pipe and sets a heat resistant limit temperature (for example, 600 ° C.) of the water pipe material. If it detects the limit temperature, the boiler gives an alarm and stops. However, as in the case of the water pipe 21 shown in FIG. 4, normally, the can water boils and reaches the upper part of the water pipe 21 to prevent overheating of the water pipe 21, but when the burner is stopped at high pressure, the boiling will not be so much. However, as in the case of the water pipe 21 in FIG. 5, the amount of canned water becomes about half, and the heat of the refractory material 22 may cause the upper portion of the water pipe 21 to overheat to near the heat-resistant limit temperature. As described above, although the water tube material has not reached the heat-resistant limit temperature, the water tube 21 is deteriorated from metal fatigue due to thermal stress due to overheating because the water tube material is considerably overheated and has a high temperature. is there.
【０００３】[0003]
【課題が解決しようとする課題】この発明は、上述の問
題点に鑑み、水管材料の耐熱限界温度以下で、しかも蒸
気圧力に対応した水管過熱防止方法を提供することを目
的とするものである。SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a water pipe overheating prevention method which is less than the heat resistant limit temperature of the water pipe material and corresponds to the steam pressure. .
【０００４】[0004]
【課題を解決するための手段】この発明は、上記課題を
解決するためになされたものであって、圧力センサを備
えた上部ヘッダと下部ヘッダとの間を多数の水管で連結
し、前記下部ヘッダに給水ポンプを備えた給水ラインを
接続し、前記水管の所定個所に温度センサを設けるとと
もに、この温度センサと前記圧力センサおよび給水ポン
プを回線を介して制御器に接続した構成のボイラにおい
て、前記制御器に、蒸気圧力に対する飽和温度と、この
飽和温度に対し予め設定した前記水管の過熱防止温度を
入力し、前記水管の温度が前記過熱防止温度に達したと
きに、前記制御器を介して前記給水ポンプを強制的に駆
動することを特徴としている。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an upper header provided with a pressure sensor and a lower header are connected by a large number of water pipes, A boiler having a structure in which a water supply line equipped with a water supply pump is connected to the header and a temperature sensor is provided at a predetermined position of the water pipe, and the temperature sensor, the pressure sensor and the water supply pump are connected to a controller via a line, In the controller, the saturation temperature with respect to the steam pressure and the preset overheat prevention temperature of the water pipe for this saturation temperature are input, and when the temperature of the water pipe reaches the overheat prevention temperature, the controller is operated through the controller. It is characterized by forcibly driving the water supply pump.
【０００５】[0005]
【作用】この発明によれば、水管の温度が予め設定した
過熱防止温度に達したとき制御器を介して給水ポンプを
強制的に駆動する。According to the present invention, when the temperature of the water pipe reaches the preset overheat prevention temperature, the water supply pump is forcibly driven via the controller.
【０００６】以下、この発明の実施例を図面に基づいて
詳細に説明する。図１は、この発明を実施した多管式貫
流ボイラの缶体の一部を破断して示す全体説明図であ
る。図中１は缶体で、環状に形成した上部ヘッダ２と下
部ヘッダ３との間を多数の水管４で連結して中央部に燃
焼室５を形成し、この燃焼室５の上部に加熱手段として
のバーナ６を配置している。このバーナ６には燃料供給
ライン７を接続しこのラインに燃料ポンプ８および燃料
用電磁弁９を挿設し、燃焼用空気は送風機１０にて前記
バーナ６に送るようにしている。そして、前記上部ヘッ
ダ２の一端に設けた蒸気圧力を検出する圧力センサ１１
の信号に基づいて制御器１２により制御する。即ち、缶
内蒸気圧力が高設定圧力を越えるとバーナ６の燃焼を停
止し、低設定圧力を切るとバーナ６の燃焼を開始するよ
うに制御している。１３は、缶体１内の水位を検出する
ための水位検出器であり、この検出器１３の信号に基づ
いて、適宜の水位制御装置により、前記下部ヘッダ３に
接続してある給水ライン１４中の給水ポンプ１５をＯＮ
−ＯＦＦさせて缶内の水位を一定のレベルに保つように
している。図中１６は、各機器と制御器１２を接続する
回線である。又、図中１７は耐火材である。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an overall explanatory view showing a can body of a multi-tube type once-through boiler according to the present invention with a part thereof broken away. In the figure, reference numeral 1 denotes a can body, and an upper header 2 and a lower header 3 formed in an annular shape are connected by a number of water pipes 4 to form a combustion chamber 5 at a central portion, and a heating means is provided above the combustion chamber 5. The burner 6 is arranged. A fuel supply line 7 is connected to the burner 6, a fuel pump 8 and a fuel electromagnetic valve 9 are inserted in this line, and combustion air is sent to the burner 6 by a blower 10. A pressure sensor 11 provided at one end of the upper header 2 for detecting the vapor pressure
It is controlled by the controller 12 based on this signal. That is, when the steam pressure in the can exceeds the high set pressure, the combustion of the burner 6 is stopped, and when the low set pressure is cut off, the combustion of the burner 6 is started. Reference numeral 13 denotes a water level detector for detecting the water level in the can body 1. Based on a signal from the detector 13, an appropriate water level control device connects the lower header 3 to the water supply line 14. Turn on the water supply pump 15
-It is turned off to keep the water level in the can at a constant level. In the figure, 16 is a line connecting each device and the controller 12. Reference numeral 17 in the figure is a refractory material.
【０００７】前記水管４の上部所定個所に温度センサ１
８を設け、この温度センサ１８を回線１６を介して制御
器１２に接続している。この制御器１２は、演算および
記憶機能を備えており、図２に示す蒸気圧力に対する飽
和温度と、この飽和温度に対して予め設定した過熱防止
温度が入力してある。A temperature sensor 1 is provided at a predetermined position above the water pipe 4.
8 is provided, and the temperature sensor 18 is connected to the controller 12 via the line 16. The controller 12 has a calculation and storage function, and the saturation temperature with respect to the vapor pressure shown in FIG. 2 and the overheat prevention temperature preset with respect to this saturation temperature are input.
【０００８】この発明の水管４の過熱防止方法は、例え
ば、ボイラの設定蒸気圧力を９ｋｇ／ｃｍ2 とすれば図
２から缶水の飽和温度約１８０℃が求められ、清浄な水
管の場合は図３に示すように、燃焼ガス８００℃のとき
水管外側温度は約２０３℃、水管内側温度１９６℃とな
る。また水管４の耐熱限界温度は６００℃に設定してい
る。この発明における過熱防止温度は、図２に示すよう
に、前記設定蒸気圧力に対する前記飽和温度にそれぞれ
Ｔ1 温度（例えば２００℃）を加算して設定している。
そして、前記水管４に過熱現象が発生し前記過熱防止温
度に達すると前記温度センサ１８から信号を回線１６を
介して前記制御器１２へ通報する。通報を受けた制御器
１２は、前記温度センサ１８からの信号と前記圧力セン
サ１１からの蒸気圧力信号とを照合し、水管過熱と判断
して前記給水ポンプ１５を強制的に駆動する。したがっ
て、水管の耐熱限界温度までには達していないが、通常
の水管温度よりも若干過熱している状態で強制的に給水
し水管温度を低下させるので、過熱による金属疲労から
の劣化を防止することができる。In the method of preventing overheating of the water pipe 4 of the present invention, for example, if the set steam pressure of the boiler is 9 kg / cm 2 , the saturation temperature of the can water is required to be about 180 ° C. from FIG. As shown in FIG. 3, when the combustion gas is 800 ° C., the temperature outside the water pipe is about 203 ° C. and the temperature inside the water pipe is 196 ° C. The heat-resistant limit temperature of the water pipe 4 is set to 600 ° C. As shown in FIG. 2, the overheat prevention temperature in the present invention is set by adding the T 1 temperature (for example, 200 ° C.) to the saturation temperature with respect to the set steam pressure.
Then, when an overheat phenomenon occurs in the water pipe 4 and the temperature reaches the overheat prevention temperature, a signal from the temperature sensor 18 is sent to the controller 12 via the line 16. The controller 12 that received the notification collates the signal from the temperature sensor 18 with the steam pressure signal from the pressure sensor 11, determines that the water pipe is overheated, and forcibly drives the water supply pump 15. Therefore, although the water pipe temperature has not reached the heat-resistant limit temperature, the water pipe temperature is lowered by forcibly supplying water when the water pipe temperature is slightly higher than the normal water pipe temperature, so deterioration from metal fatigue due to overheating is prevented. be able to.
【０００９】[0009]
【発明の効果】以上説明したように、この発明によれ
ば、制御器に蒸気圧力に対する飽和温度と、この飽和温
度に対し予め設定した過熱防止温度を入力し、水管の温
度が前記過熱防止温度に達したとき前記制御器を介して
給水ポンプを強制的に駆動するようにしたので、水管の
耐熱限界温度までは達していないが、通常の水管温度よ
りも若干過熱している状態で強制的に給水し、水管過熱
による金属疲労からの劣化を防止することができる。ま
た水管の耐熱限界温度まで過熱することがなく、したが
って水管過熱によるボイラの停止はなくなり効率的であ
る。As described above, according to the present invention, the saturation temperature with respect to the vapor pressure and the preset overheat prevention temperature for this saturation temperature are input to the controller, and the temperature of the water pipe is the above-mentioned overheat prevention temperature. When the temperature reaches, the water supply pump is forcibly driven via the controller, so the water pipe has not reached the heat-resistant limit temperature, but is forced to operate when it is slightly overheated from the normal water pipe temperature. Water can be supplied to prevent deterioration from metal fatigue due to overheating of the water pipe. Further, the water pipe does not overheat to the heat-resistant limit temperature, and therefore the boiler is not stopped due to overheating of the water pipe, which is efficient.
【図１】この発明を実施した多管式貫流ボイラの缶体の
一部を破断して示す説明図である。FIG. 1 is an explanatory view showing a can body of a multi-tube type once-through boiler embodying the present invention in a partially broken manner.
【図２】この発明におけるボイラの蒸気圧力に対する缶
水の飽和温度、通常の水管温度、過熱設定温度および水
管の耐熱限界温度の関係を示す説明図である。FIG. 2 is an explanatory diagram showing a relationship between a saturated temperature of can water, a normal water pipe temperature, a superheat set temperature, and a heat resistance limit temperature of the water pipe with respect to a steam pressure of a boiler in the present invention.
【図３】清浄水管における蒸気圧力９ｋｇ／ｃｍ2 のと
きの燃焼温度、水管温度、飽和温度を示す説明図であ
る。FIG. 3 is an explanatory diagram showing a combustion temperature, a water pipe temperature, and a saturation temperature when the steam pressure in the clean water pipe is 9 kg / cm 2 .
【図４】多管式貫流ボイラの水管上部まで缶水が沸騰し
ている状態を示す説明図である。FIG. 4 is an explanatory view showing a state in which can water is boiling up to the upper part of a water pipe of a multi-tube once-through boiler.
【図５】多管式貫流ボイラの水管内で缶水があまり沸騰
していない状態を示す説明図である。FIG. 5 is an explanatory view showing a state in which can water does not boil so much in a water pipe of a multi-tube once-through boiler.
２ 上部ヘッダ ３ 下部ヘッダ ４ 水管 １１ 圧力センサ １２ 制御器 １４ 給水ライン １５ 給水ポンプ １８ 温度センサ 2 Upper header 3 Lower header 4 Water pipe 11 Pressure sensor 12 Controller 14 Water supply line 15 Water supply pump 18 Temperature sensor
───────────────────────────────────────────────────── フロントページの続き (72)発明者 重松 信義 愛媛県松山市堀江町７番地 三浦工業株式 会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuyoshi Shigematsu 7 Horie-cho, Matsuyama-shi, Ehime Miura Industrial Co., Ltd.
Claims (1)
下部ヘッダ３との間を多数の水管４で連結し、前記下部
ヘッダ３に給水ポンプ１５を備えた給水ライン１４を接
続し、前記水管４の所定個所に温度センサ１８を設ける
とともに、この温度センサ１８と前記圧力センサ１１お
よび給水ポンプ１５を回線１６を介して制御器１２に接
続した構成のボイラにおいて、前記制御器１２に、蒸気
圧力に対する飽和温度と、この飽和温度に対し予め設定
した前記水管４の過熱防止温度を入力し、前記水管４の
温度が前記過熱防止温度に達したときに、前記制御器１
２を介して前記給水ポンプ１５を強制的に駆動すること
を特徴とするボイラ用水管の過熱防止方法。1. An upper header 2 equipped with a pressure sensor 11 and a lower header 3 are connected by a number of water pipes 4, and a water supply line 14 equipped with a water supply pump 15 is connected to the lower header 3. 4, a temperature sensor 18 is provided at a predetermined location, and the temperature sensor 18, the pressure sensor 11 and the water supply pump 15 are connected to the controller 12 via a line 16, and the controller 12 is provided with a steam pressure. And a preset overheat prevention temperature of the water pipe 4 for the saturation temperature are input, and when the temperature of the water pipe 4 reaches the overheat prevention temperature, the controller 1
2. A method for preventing overheating of a boiler water pipe, characterized in that the water supply pump 15 is forcibly driven via 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2608595A JPH08200607A (en) | 1995-01-20 | 1995-01-20 | Overheat preventing method for water tube of boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2608595A JPH08200607A (en) | 1995-01-20 | 1995-01-20 | Overheat preventing method for water tube of boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08200607A true JPH08200607A (en) | 1996-08-06 |
Family
ID=12183791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2608595A Pending JPH08200607A (en) | 1995-01-20 | 1995-01-20 | Overheat preventing method for water tube of boiler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08200607A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000007919A (en) * | 1998-07-08 | 2000-02-07 | 배길성 | Heater tank structure of an automatic vending machine |
| KR100419774B1 (en) * | 2001-04-03 | 2004-02-21 | 연 일 성 | The digital safe control device of a steam boiler |
-
1995
- 1995-01-20 JP JP2608595A patent/JPH08200607A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000007919A (en) * | 1998-07-08 | 2000-02-07 | 배길성 | Heater tank structure of an automatic vending machine |
| KR100419774B1 (en) * | 2001-04-03 | 2004-02-21 | 연 일 성 | The digital safe control device of a steam boiler |
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