JPS6337281B2 - - Google Patents
Info
- Publication number
- JPS6337281B2 JPS6337281B2 JP13529979A JP13529979A JPS6337281B2 JP S6337281 B2 JPS6337281 B2 JP S6337281B2 JP 13529979 A JP13529979 A JP 13529979A JP 13529979 A JP13529979 A JP 13529979A JP S6337281 B2 JPS6337281 B2 JP S6337281B2
- Authority
- JP
- Japan
- Prior art keywords
- steam
- fluidized bed
- tube
- superheater
- superheater tube
- 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 8
- 238000000034 method Methods 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 239000003245 coal Substances 0.000 description 7
- 239000000446 fuel Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Description
【発明の詳細な説明】
この発明はタービンその他の蒸気を使用する機
器に対して蒸気を供給する流動層ボイラの層内過
熱器管の焼損防止方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing burnout of an intrabed superheater tube of a fluidized bed boiler that supplies steam to a turbine or other steam-using equipment.
石炭等の燃料を流動層において燃焼させること
により発生する熱を蒸気発生に利用する流動層ボ
イラは層内の熱を有効に利用するため流動層内に
蒸発管、過熱器管を配置している。この流動層ボ
イラにおいて、蒸気を利用する機器、例えば発電
用の蒸気タービンが故障等の緊急時において、タ
ービンに対する蒸気の供給をただちに停止すると
共に流動層に対する燃料の供給も停止して流動層
の運転も停止せねばならない。この場合、流動層
は運転中約850℃の高温となつており、かつ流動
媒体の保有熱量が大であるため運転停止後相当の
時間高温状態を保つことになる。タービンに対す
る蒸気の供給を停止することにより、流動層の余
熱により発生した蒸気は蒸気溜又は系外に排出す
る等の方法を採る必要がある。この場合過熱器管
に対する蒸気の供給量を装置の運転中のままにし
ておくと系外に大量の蒸気が放出されることとな
るという問題が生ずる。反対に蒸気の供給を停止
すると管内の残留蒸気は蒸発し、これを系外に放
出してしまうと管壁が過熱して管体を焼損する虞
れが生ずる。 A fluidized bed boiler uses the heat generated by burning coal or other fuel in a fluidized bed to generate steam.Evaporator tubes and superheater tubes are placed within the fluidized bed to effectively utilize the heat within the bed. . In this fluidized bed boiler, in the event of an emergency such as a failure of equipment that uses steam, such as a steam turbine for power generation, the supply of steam to the turbine is immediately stopped, and the supply of fuel to the fluidized bed is also stopped to operate the fluidized bed. must also be stopped. In this case, the fluidized bed is at a high temperature of about 850° C. during operation, and the fluidized medium has a large amount of heat, so the high temperature state will be maintained for a considerable period of time after the operation is stopped. By stopping the supply of steam to the turbine, it is necessary to take a method such as discharging the steam generated by the residual heat of the fluidized bed to a steam reservoir or outside the system. In this case, if the amount of steam supplied to the superheater tube remains unchanged while the device is in operation, a problem arises in that a large amount of steam will be released outside the system. On the other hand, if the supply of steam is stopped, the residual steam inside the tube will evaporate, and if this is released outside the system, there is a risk that the tube wall will overheat and the tube body will burn out.
この発明の目的は流動層ボイラの緊急停止時に
系外に排出する損失蒸気の量を少なくし、通常の
鋼管等の材料を使用した層内過熱器管でも焼損を
起こすことのない方法を提供することにある。 The purpose of this invention is to provide a method for reducing the amount of lost steam discharged to the outside of the system during emergency shutdown of a fluidized bed boiler, and preventing burnout even in bed superheater tubes made of materials such as ordinary steel tubes. There is a particular thing.
要するにこの発明は、蒸気の供給を緊急に停止
し、かつ流動層ボイラの運転を停止する必要が生
じた場合、流動層内の過熱器管に対する蒸気の供
給を一旦停止し、過熱器管の管壁温度を検知しつ
つ配管が焼損しないよう徐々に蒸気の供給を再開
し、かつ流動層の余熱により生じた蒸気を配管内
の圧力を検知しつつ徐々に系外に放出し、場合に
よつては、層内過熱器管にも注水して管体の冷却
を行なう方法であることを特徴とする。 In short, this invention temporarily stops the supply of steam to the superheater tubes in the fluidized bed when it is necessary to stop the supply of steam and stop the operation of the fluidized bed boiler. While detecting the wall temperature, the steam supply is gradually restarted to prevent piping from burning out, and the steam generated by the residual heat of the fluidized bed is gradually released outside the system while detecting the pressure inside the piping. This method is characterized in that water is also injected into the intralayer superheater tube to cool the tube body.
先ず流動層ボイラ運転の概略について説明す
る。 First, an overview of fluidized bed boiler operation will be explained.
第１図に示す第１の実施例において、１は流動
層ボイラ本体、２は気胴である。給水は給水ポン
プ３によりエコノマイザ４を経由して気胴２に供
給される。本体１の下部には空気室５が形成され
多孔板６を通して流動層８に対して焼燃用空気が
供給される。流動層８にはこの流動層と熱交換を
行なう伝熱管として蒸発管９および過熱器管１０
が設けてある。過熱器管１０内の蒸気は蒸気配管
３０、主蒸気弁３４を経由してタービン３１を作
動させる。流動層８内で石炭等の燃料が燃焼する
ことにより生じた高温のガスは蒸発管群１２ａ，
１２ｂ、エコノマイザ４を経て系外に排出され
る。ホツパ１８内の石炭は分級装置２０において
分級され、粗粒炭は粗粒炭ホツパ２１、スクリユ
ーフイーダ２４を経て散布装置２５により前記流
動層８に供給される。一方微粉炭は気流輪送され
バーナ２９ａ，２９ｂにより流動層内で燃焼す
る。 In the first embodiment shown in FIG. 1, 1 is a fluidized bed boiler main body, and 2 is a gas cylinder. Water is supplied to the gas cylinder 2 by a water pump 3 via an economizer 4. An air chamber 5 is formed in the lower part of the main body 1, and combustion air is supplied to the fluidized bed 8 through a perforated plate 6. The fluidized bed 8 includes an evaporator tube 9 and a superheater tube 10 as heat transfer tubes for exchanging heat with the fluidized bed.
is provided. The steam in the superheater tube 10 operates a turbine 31 via a steam pipe 30 and a main steam valve 34. High-temperature gas generated by combustion of fuel such as coal in the fluidized bed 8 is passed through the evaporator tube group 12a,
12b, and is discharged from the system through the economizer 4. The coal in the hopper 18 is classified in a classifier 20, and the coarse coal is supplied to the fluidized bed 8 by a scattering device 25 via a coarse coal hopper 21 and a screw feeder 24. On the other hand, the pulverized coal is air-fed and burned in the fluidized bed by burners 29a and 29b.
以上の流動層ボイラ装置において、タービン３
１の故障が生じた場合、タービン故障の信号が制
御箱３２に送られる。制御箱３２はこの信号に基
づいて蒸気供給管３０に設けた主蒸気弁３４を全
閉としてタービン３１に対する蒸気の供給を完全
に停止し、かつ蒸気管３３に設けた弁３５も全閉
とし、前記過熱器管１０に対する蒸気の供給を一
旦停止する。もとよりここの時点において流動層
８に対する燃料（石炭）の供給は停止する。３６
は蒸気供給管３０に接続した蒸気排出管、３７は
この蒸気排出管３６に接続した管内圧力検知器、
３８は蒸気逃し弁である。前記蒸気の供給を一旦
停止したことにより過熱器管１０の温度は上昇す
るので、この過熱器管１０に設けた管壁温度検知
器３９により検知し、この信号に基づいて制御箱
３２は弁３５を微開にして過熱器管１０が焼損し
ないように蒸気を供給する。このため過熱器管１
０内の圧力は上昇し、この管内圧力を圧力検知器
３７により検知し、蒸気逃し弁３８を操作し、例
えば半開程度として蒸気を徐々に系外に排出す
る。以上の操作において層中温度の低下に対応し
て蒸気量をさらに減少させ、圧力検知器３７によ
り検知した管内圧力がほぼ０になり、かつ管壁温
度が焼損のおそれのない温度となつたときは弁３
８を全開にして管内の蒸気を完全に放出し、作業
を完了する。この実施例では過熱器管をステンレ
ス材とし過熱器管内には気胴から蒸気を供給し放
出させるものでステンレス材の使用により焼損も
なく特別の配管も不用となるという効果がある。 In the above fluidized bed boiler device, the turbine 3
1 failure, a turbine failure signal is sent to control box 32. Based on this signal, the control box 32 fully closes the main steam valve 34 provided in the steam supply pipe 30 to completely stop the supply of steam to the turbine 31, and also fully closes the valve 35 provided in the steam pipe 33. The supply of steam to the superheater tube 10 is temporarily stopped. Of course, at this point, the supply of fuel (coal) to the fluidized bed 8 is stopped. 36
37 is a steam exhaust pipe connected to the steam supply pipe 30; 37 is an internal pressure sensor connected to the steam exhaust pipe 36;
38 is a steam relief valve. Since the temperature of the superheater tube 10 rises by temporarily stopping the supply of steam, the temperature is detected by the tube wall temperature detector 39 provided in the superheater tube 10, and based on this signal, the control box 32 closes the valve 35. is slightly opened to supply steam so as not to burn out the superheater tube 10. For this reason, superheater tube 1
The pressure inside the pipe increases, and the pressure inside the pipe is detected by the pressure detector 37, and the steam relief valve 38 is operated, for example, to a half-open position to gradually discharge steam out of the system. In the above operations, the amount of steam is further reduced in response to the decrease in the temperature in the bed, and when the pressure inside the pipe detected by the pressure detector 37 becomes almost 0 and the temperature of the pipe wall reaches a temperature where there is no risk of burnout. Haben 3
8 is fully opened to completely release the steam inside the pipe and complete the work. In this embodiment, the superheater tube is made of stainless steel, and steam is supplied and released from the gas cylinder into the superheater tube, and the use of stainless steel has the advantage that there is no burnout and no special piping is required.
第２図は第２の実施例を示し、前記実施例に示
した過熱器管１０の温度制御系に加えて蒸発管９
の温度制御を行うようにしたものである。この実
施例においては蒸気管３３と蒸発管９の間を配管
４１で接続し、さらにこの配管４１には給水流量
を調整する弁４２が設けてある。タービン３１の
停止により主蒸気弁３４を閉とし、前記実施例に
示した操作で過熱器管１０の温度制御をする一
方、過熱器管１０に設けた温度検知器３９により
過熱器管１０の管壁温度を検知した制御箱３２は
弁４２を微開にして過熱器管１０内に給水を注入
して管壁温度を制御する。このため、過熱器管の
材料を高価なステンレス系金属とする必要がな
い。 FIG. 2 shows a second embodiment, in which in addition to the temperature control system of the superheater tube 10 shown in the previous embodiment, the evaporator tube 9
temperature control. In this embodiment, the steam pipe 33 and the evaporation pipe 9 are connected by a pipe 41, and the pipe 41 is further provided with a valve 42 for adjusting the flow rate of water supply. When the turbine 31 is stopped, the main steam valve 34 is closed and the temperature of the superheater tube 10 is controlled by the operation shown in the above embodiment. The control box 32 that has detected the wall temperature slightly opens the valve 42 to inject water into the superheater tube 10 to control the tube wall temperature. Therefore, there is no need to use expensive stainless metal as the material of the superheater tube.
なお層内の蒸発管９にはボイラ水が自然循環で
供給されるので過熱器管のような焼損の心配はな
い。 It should be noted that since boiler water is supplied to the evaporator tube 9 in the layer through natural circulation, there is no risk of burning out unlike the superheater tube.
この発明によれば、流動層ボイラの運転停止に
伴う流動層の温度降下に対応して過熱器管の管壁
温度を制御するので、大量の蒸気の放出による熱
損失、管の焼損等の問題が生じない。 According to this invention, the tube wall temperature of the superheater tube is controlled in response to the temperature drop in the fluidized bed due to the suspension of operation of the fluidized bed boiler, so problems such as heat loss due to release of a large amount of steam and burnout of the tubes occur. does not occur.
また操作を制御箱にて行なえばすべて自動制御
することができる。 Furthermore, if all operations are performed using the control box, all operations can be automatically controlled.
第１図はこの発明の第１の実施例を示す管壁温
度制御の系統図、第２図は第２の実施例を示す管
壁温度制御の系統図である。
１……流動層ボイラ本体、２……気胴、８……
流動層、９……蒸発管、１０……過熱器管、３０
……蒸気供給管、３１……タービン、３２……制
御箱、３３……給水管、３４……主蒸気弁、３
５，３８，４２……弁、３６……蒸気排出管、３
７……圧力検知器、３９，４０……管壁温度検知
器。
FIG. 1 is a system diagram of tube wall temperature control showing a first embodiment of the present invention, and FIG. 2 is a system diagram of tube wall temperature control showing a second embodiment. 1... Fluidized bed boiler main body, 2... Gas cylinder, 8...
Fluidized bed, 9... Evaporation tube, 10... Superheater tube, 30
... Steam supply pipe, 31 ... Turbine, 32 ... Control box, 33 ... Water supply pipe, 34 ... Main steam valve, 3
5, 38, 42... Valve, 36... Steam exhaust pipe, 3
7...Pressure detector, 39,40...Pipe wall temperature detector.
Claims (1)
イラの主蒸気弁を緊急遮断する場合、層内過熱器
管に対する蒸気の供給を停止し、層内過熱器管の
管壁温度に対応して過熱器管の損傷を生じない量
の水または蒸気を供給して過熱器管の温度御御を
行ない、かつ過熱器管内圧を検知しつつ流動層の
余熱により生じた蒸気を徐々に系外に排出するこ
とを特徴とする流動層ボイラの層内過熱器管焼損
防止方法。 ２ 前記層内過熱器管の温度制御を制御箱により
自動的に行なうことを特徴とする特許請求の範囲
第１項記載の流動層ボイラの層内過熱器管焼損防
止方法。 ３ 過熱器管をステンレス材の管とすることを特
徴とする特許請求の範囲第１項記載の流動層ボイ
ラの層内過熱器管焼損防止方法。[Claims] 1. When the main steam valve of a fluidized bed boiler in which a superheater tube is disposed within a fluidized bed is to be shut off in an emergency, the supply of steam to the intrabed superheater tube is stopped and the intrabed superheater tube is The temperature of the superheater tubes is controlled by supplying an amount of water or steam that does not cause damage to the superheater tubes in accordance with the tube wall temperature of A method for preventing burnout of an intrabed superheater tube of a fluidized bed boiler, which is characterized by gradually discharging steam from the system out of the system. 2. The method for preventing burnout of an intrabed superheater tube in a fluidized bed boiler according to claim 1, characterized in that the temperature of the intrabed superheater tube is automatically controlled by a control box. 3. A method for preventing burnout of an intrabed superheater tube of a fluidized bed boiler according to claim 1, characterized in that the superheater tube is made of stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13529979A JPS5661502A (en) | 1979-10-22 | 1979-10-22 | Method of preventing burning loss of interrlayer heat exchanger tube for fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13529979A JPS5661502A (en) | 1979-10-22 | 1979-10-22 | Method of preventing burning loss of interrlayer heat exchanger tube for fluidized bed boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5661502A JPS5661502A (en) | 1981-05-27 |
| JPS6337281B2 true JPS6337281B2 (en) | 1988-07-25 |
Family
ID=15148450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13529979A Granted JPS5661502A (en) | 1979-10-22 | 1979-10-22 | Method of preventing burning loss of interrlayer heat exchanger tube for fluidized bed boiler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5661502A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56130501A (en) * | 1980-03-19 | 1981-10-13 | Babcock Hitachi Kk | Fluidized bed boiler |
| JPS58102001A (en) * | 1981-12-11 | 1983-06-17 | バブコツク日立株式会社 | Fluid layer boiler device |
| JPS58107401U (en) * | 1982-01-13 | 1983-07-21 | 川崎重工業株式会社 | Fluidized bed combustion furnace |
| JPS6123001U (en) * | 1984-07-10 | 1986-02-10 | バブコツク日立株式会社 | Burnout prevention type fluidized bed boiler |
-
1979
- 1979-10-22 JP JP13529979A patent/JPS5661502A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5661502A (en) | 1981-05-27 |
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