JPH10185180A - Temperature control method for regenerative burner combustion system - Google Patents
Temperature control method for regenerative burner combustion systemInfo
- Publication number
- JPH10185180A JPH10185180A JP8345626A JP34562696A JPH10185180A JP H10185180 A JPH10185180 A JP H10185180A JP 8345626 A JP8345626 A JP 8345626A JP 34562696 A JP34562696 A JP 34562696A JP H10185180 A JPH10185180 A JP H10185180A
- Authority
- JP
- Japan
- Prior art keywords
- burner
- combustion
- exhaust
- temperature
- valve
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Air Supply (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、リジェネバーナ燃
焼システムの温度制御方法に係わる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control method for a regenerative burner combustion system.
【０００２】[0002]
【従来の技術】従来から、リジェネバーナ燃焼システム
では、加熱炉の側面に向い合わせてリジェネバーナ装置
が配置されている。このようなリジェネバーナ燃焼シス
テムは、例えば、炉の片側のリジェネバーナ装置に燃料
と燃焼用空気を供給して燃焼を行い、向い側のリジェネ
バーナ装置から排ガスを吸引する動作を、燃焼と吸引の
役割を交互に交替させて運転される。この結果、吸引側
のリジェネバーナ装置の蓄熱器は排ガスの熱が蓄えら
れ、次に燃焼側となったときに炉内に吹き込む燃焼用空
気の加熱に利用される。2. Description of the Related Art Conventionally, in a regenerative burner combustion system, a regenerative burner device is arranged facing a side surface of a heating furnace. Such a regenerative burner combustion system, for example, performs an operation of supplying fuel and combustion air to a regenerative burner device on one side of a furnace to perform combustion, and sucking exhaust gas from a regenerative burner device on the opposite side. It is operated with roles alternated. As a result, the heat regenerator of the regenerative burner device on the suction side stores the heat of the exhaust gas, and is used for heating the combustion air blown into the furnace when the regenerative burner enters the combustion side next time.
【０００３】このような、リジェネバーナ燃焼システム
は炉内の温度を下げようとすると、一般的には、高温領
域においてはバーナの燃料供給量及び燃焼空気供給量を
減らして全体の燃焼量を減らしている。ところが、減し
過ぎると不燃焼が生じたり火炎の長さが短くなったりし
て炉内温度が不均一になる。又、低温領域においては、
Ｎｏｘの発生を押えるために、燃焼バーナの本数の削減
（間引き）を行なっていることが特開平６−２００３２
１号に示されている。In order to reduce the temperature inside the furnace, such a regenerative burner system generally reduces the burner fuel supply amount and combustion air supply amount in a high temperature region to reduce the overall combustion amount. ing. However, if the temperature is reduced too much, non-combustion occurs or the length of the flame becomes short, so that the furnace temperature becomes uneven. In the low temperature region,
Japanese Unexamined Patent Publication No. Hei 6-20032 discloses that the number of combustion burners is reduced (thinned out) in order to suppress the generation of Nox.
No. 1 is shown.
【０００４】このような間引きを実施すると熱源の歯抜
けにより炉内温度が不均一になったり、材料の温度が不
均一になったりしていた。又、間引きによって燃焼バー
ナの本数が少なくなるとバーナ１本当たりの燃料流量の
全体に占める割合が増大するため、バーナの切り替え時
に燃料流量が相対的に大きく変動することにより制御系
がハンチングを起こし制御ができなくなることがある。
そのために、バーナの切り替えの際は、流量調節弁の制
御をホールドしている。従って、応答性が劣化し、昇温
時間の遅延を起こしたり、オーバーヒートさせてしまう
という問題が生じていた。[0004] When such thinning is performed, the temperature inside the furnace becomes uneven or the temperature of the material becomes uneven due to omission of the heat source. Also, when the number of combustion burners decreases due to thinning, the ratio of the fuel flow per burner to the whole increases, so that the control system causes hunting due to a relatively large change in the fuel flow when the burner is switched. May not be possible.
Therefore, when the burner is switched, the control of the flow control valve is held. Therefore, there has been a problem that the responsiveness is deteriorated, and the temperature rise time is delayed or overheating is caused.
【０００５】[0005]
【発明が解決しようとする課題】そこで、本発明は、低
温領域でも制御系にハンチングを起こしたりしない、リ
ジェネバーナ燃焼システムの温度制御方法を提供するこ
とを目的とする。Accordingly, an object of the present invention is to provide a temperature control method for a regenerative burner combustion system, which does not cause hunting in a control system even in a low temperature range.
【０００６】[0006]
【課題を解決するための手段、発明の実施の形態及び発
明の効果】上記目的を達成するためになされた請求項１
の発明は、バーナと蓄熱器を有するリジェネバーナ燃焼
システムの低燃焼領域内の温度制御方法において、バー
ナを燃焼から排気に切り替える際、まず燃焼側バーナの
燃料供給弁を閉とし、次に該燃焼側バーナの燃焼空気供
給弁及び排気側バーナの排気弁を閉とし、その後所定の
保持時間に渡って、前記燃焼側及び排気側のバーナの各
燃焼空気供給弁及び各排気弁をいずれも閉に保持し続け
た後、前記燃焼側バーナの排気弁及び前記排気側のバー
ナの燃焼空気供給弁を開いて、バーナの燃焼側と排気側
とを切り替えることを特徴とする。Means for Solving the Problems, Embodiments of the Invention and Effects of the Invention Claims have been made to achieve the above object.
The invention relates to a temperature control method in a low combustion region of a regenerative burner combustion system having a burner and a regenerator, wherein when the burner is switched from combustion to exhaust, first the fuel supply valve of the combustion side burner is closed, and then the combustion The combustion air supply valve of the burner on the side and the exhaust valve of the burner on the exhaust side are closed, and thereafter, for a predetermined holding time, both the combustion air supply valve and the exhaust valve of the burner on the combustion side and the exhaust side are closed. After the holding, the exhaust valve of the combustion side burner and the combustion air supply valve of the exhaust side burner are opened to switch between the combustion side and the exhaust side of the burner.
【０００７】請求項１記載の発明によると、バーナ切り
替えの間に燃焼ガス排気弁を閉じて保持時間を設けたか
ら炉内の温度が下がり難いし、燃料の燃焼時間が少なく
て済む。又、従来例のように燃焼バーナの間引きを行な
わないから炉内温度が均一になるし、燃料流量が少し変
動しても大きな変動量にならないからバーナの切り替え
の際、制御系にハンチングを起こしたりしない。従っ
て、安定した制御ができる。According to the first aspect of the present invention, since the combustion gas exhaust valve is closed and the holding time is provided during the switching of the burner, the temperature in the furnace is hardly lowered, and the combustion time of the fuel is reduced. In addition, since the combustion burner is not thinned out as in the conventional example, the temperature inside the furnace becomes uniform, and even if the fuel flow rate fluctuates a little, it does not become a large fluctuation amount, so when switching the burner, hunting occurs in the control system. Or not. Therefore, stable control can be performed.
【０００８】請求項２記載の発明は、請求項１記載のリ
ジェネバーナ燃焼システムの温度制御方法において、前
記保持時間をバーナの切替サイクル時間に対して１０〜
９０％の範囲とするとよい。請求項２記載の発明による
と、燃焼後の保持時間が十分とれるから、この間は高温
の排ガスを炉外に逃さないで済む。従って燃焼時間を少
なくできる。According to a second aspect of the present invention, in the temperature control method for a regenerative burner combustion system according to the first aspect, the holding time is set to be 10 to the switching cycle time of the burner.
The range is preferably 90%. According to the second aspect of the present invention, since a sufficient holding time after combustion can be secured, high-temperature exhaust gas does not have to escape outside the furnace during this time. Therefore, the burning time can be reduced.
【０００９】なお、保持時間を１０〜９０％としたのは
バーナ燃焼の安定性を確保するためである。バーナ燃焼
の安定性を確保しながら炉内温度を下げるためには、保
持時間を２５〜５０％とするのが望ましい。リジェネバ
ーナ燃焼システムでは、一般に、バーナの切替サイクル
は約３０秒に設定されている。そこで、請求項３記載の
発明は、請求項１又は２記載のリジェネバーナ燃焼シス
テムの温度制御方法において、前記バーナの切替サイク
ル時間を３０秒としたとき、燃料の供給時間を９〜１５
秒間とし、前記保持時間を８〜１４秒間としたことを特
徴とする。The holding time is set to 10 to 90% in order to ensure the stability of burner combustion. In order to lower the furnace temperature while ensuring the stability of burner combustion, the holding time is desirably set to 25 to 50%. In regenerative burner combustion systems, the burner switching cycle is typically set at about 30 seconds. Therefore, a third aspect of the present invention is the temperature control method for a regenerative burner combustion system according to the first or second aspect, wherein the switching cycle time of the burner is 30 seconds, and the fuel supply time is 9 to 15 seconds.
Seconds, and the holding time is 8 to 14 seconds.
【００１０】請求項３記載の発明によると、低温領域で
も、燃焼量を燃焼時間で減らし、燃焼量を絞り過ぎたり
しないからＮＯｘが増大しない。尚、燃料供給時間をバ
ーナの切替サイクルの９〜１５秒間にしたのは、９秒間
以下では昇温不足を招くし、１５秒間以上では低い温度
で保持できなくなるからである。その両方を満させるよ
うに９〜１５秒間とした。又、保持時間を８〜１４秒間
にしたのは、８秒間以下では保持効果が現れ難いし、１
４秒間以上では蓄熱器の温度が蓄えられなくなり、次の
燃焼の際に低温の燃焼空気を吹き込むことになるからで
ある。According to the third aspect of the present invention, even in a low temperature range, the amount of combustion is reduced by the combustion time, and the amount of combustion is not excessively reduced, so that NOx does not increase. The reason for setting the fuel supply time to 9 to 15 seconds in the burner switching cycle is that if the time is shorter than 9 seconds, the temperature rise will be insufficient, and if it is longer than 15 seconds, it will not be possible to maintain a low temperature. 9-15 seconds to fill both. The reason why the holding time is set to 8 to 14 seconds is that the holding effect is difficult to be exhibited if the holding time is 8 seconds or less.
This is because if it is longer than 4 seconds, the temperature of the regenerator will not be stored, and low-temperature combustion air will be blown in the next combustion.
【００１１】[0011]
【実施例】本発明の実施例を図に基づいて説明する。実
施例のリジェネバーナ燃焼システム１は、図１に示すよ
うな構成をしている。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. The regenerative burner combustion system 1 of the embodiment has a configuration as shown in FIG.
【００１２】炉２の側壁に設けられたバーナＡ，バーナ
Ｂと、燃料供給系１０と燃焼空気供給系２０と燃焼排ガ
ス排気系３０とからなる。バーナＡ，バーナＢの内部に
は蓄熱体３，４が備えられている。燃料供給系１０は、
燃料供給口１１から供給される燃料をパイプ１２を介し
てバーナＡ，Ｂに燃料が供給される。１３，１４は切替
用の電磁弁である。A burner A, a burner B provided on a side wall of the furnace 2, a fuel supply system 10, a combustion air supply system 20, and a combustion exhaust gas exhaust system 30 are provided. The heat storage bodies 3 and 4 are provided inside the burners A and B. The fuel supply system 10
Fuel supplied from a fuel supply port 11 is supplied to burners A and B via a pipe 12. 13 and 14 are switching solenoid valves.
【００１３】燃焼空気供給系２０は、ブロア２１から供
給される燃焼空気をパイプ２２を介してバーナＡ又はバ
ーナＢに供給している。２３は開閉ダンパであり、２
４，２５は切替用の電磁弁である。燃焼排ガス排気系３
０は、ブロア３１でパイプ３２を介してバーナＢ又はバ
ーナＡから燃焼排ガスを吸引して排出する。３３は開閉
ダンパであり、３４，３５は切替用の電磁弁である。The combustion air supply system 20 supplies combustion air supplied from a blower 21 to a burner A or a burner B via a pipe 22. 23 is an opening / closing damper, 2
Reference numerals 4 and 25 denote switching solenoid valves. Exhaust gas exhaust system 3
Numeral 0 indicates that the combustion exhaust gas is sucked and discharged from the burner B or the burner A via the pipe 32 by the blower 31. Reference numeral 33 denotes an open / close damper, and reference numerals 34 and 35 denote switching solenoid valves.
【００１４】図１の場合はバーナＡ側が燃焼状態にあ
り、バーナＢが燃焼排ガス排気系になっている状態を表
している。所定の時間が来ると夫々の電磁弁を切り替え
て、今度はバーナＢ側を燃焼させると共に、バーナＡ側
から燃焼排ガスを排出する。このようにすると、燃焼排
ガスを排出する際に蓄熱体３，４に高温の排ガスの熱が
蓄えられて、次の燃焼に使用する際の燃焼空気を加熱す
る。FIG. 1 shows a state in which the burner A is in a combustion state and the burner B is a combustion exhaust gas exhaust system. When a predetermined time comes, the respective electromagnetic valves are switched to burn the burner B side and discharge the combustion exhaust gas from the burner A side. In this way, when exhausting the combustion exhaust gas, the heat of the high-temperature exhaust gas is stored in the regenerators 3 and 4 to heat the combustion air when used for the next combustion.
【００１５】次に、リジェネバーナ燃焼システムの燃焼
時間制御方法を図２に基づいて説明する。最初は、電磁
弁１３，１４，２４，２５，３４，３５及びダンパ２
３，３３を閉としてある。パイロットバーナを点火し、
次に、電磁弁２４，３４とダンパ２３，３３を開とし、
バーナＡのバーナ本体内に残っている燃焼排気ガスを炉
内に押し出すために、ブロア２１からの燃焼空気でプレ
パージを３〜５秒間行なう（Ｔｗ）。このようにしてバ
ーナＡ内に残っている排ガスを一掃する。これと同時に
ブロア３１でバーナＢを介して排ガスが排出される。次
に電磁弁１３を開とし、燃料を９〜１５秒間供給し（Ｔ
ｆ）、燃焼する。所定時間燃焼させた後電磁弁１３を閉
じる。電磁弁１３が閉じたら、今度はバーナ本体内に残
っている未燃燃料を一掃するために、燃焼空気を送り続
けてポストパージを３〜５秒間行なう（Ｔｐ）。ポスト
パージの終了直前に電磁弁２４と電磁弁３４を同時に閉
じる。電磁弁２４と電磁弁３４を閉じたらそのままの状
態で８〜１４秒間保持する。Next, a method of controlling the combustion time of the regenerating burner combustion system will be described with reference to FIG. Initially, solenoid valves 13, 14, 24, 25, 34, 35 and damper 2
3, 33 are closed. Ignite pilot burner,
Next, the solenoid valves 24 and 34 and the dampers 23 and 33 are opened,
In order to push out the combustion exhaust gas remaining in the burner body of the burner A into the furnace, prepurge is performed for 3 to 5 seconds with the combustion air from the blower 21 (Tw). Thus, the exhaust gas remaining in the burner A is wiped out. At the same time, exhaust gas is discharged from the blower 31 via the burner B. Next, the solenoid valve 13 is opened, and fuel is supplied for 9 to 15 seconds (T
f) Burn. After burning for a predetermined time, the solenoid valve 13 is closed. After the solenoid valve 13 is closed, in order to purge unburned fuel remaining in the burner body, post-purge is performed for 3 to 5 seconds by continuously feeding the combustion air (Tp). Immediately before the end of the post-purge, the solenoid valves 24 and 34 are simultaneously closed. When the electromagnetic valves 24 and 34 are closed, the state is maintained for 8 to 14 seconds.
【００１６】こうすることによって、バーナＡの燃焼か
らバーナＢの燃焼への切り替えが終了し、後はバーナＡ
を排気側、バーナＢを燃焼側として上記と同様のパター
ンの交互の繰り返しである。バーナＡ，Ｂの燃焼性に問
題のない流量域では流量調節弁で燃焼量を調節し、問題
のある少ない流量域ではバーナＡ，Ｂの本数を間引きせ
ずにバーナＡ，Ｂの燃焼時間を短縮させたり、排気系３
０を閉じてそのままの状態で所定時間保持する。このよ
うにするとバーナＡ，Ｂを間引きしたように切替時の制
御系へのハンチングが生じないし、バーナＡ，Ｂの損傷
も少なくて済む。Thus, the switching from the combustion of the burner A to the combustion of the burner B is completed.
Is the exhaust side, and the burner B is the combustion side. In the flow rate range where there is no problem in the burnability of the burners A and B, the amount of combustion is adjusted by the flow rate control valve. Or shorten the exhaust system 3
0 is closed and held for a predetermined period of time. In this manner, hunting to the control system at the time of switching does not occur as if the burners A and B were thinned out, and damage to the burners A and B can be reduced.
【００１７】又、バーナの切り替えの間に保持時間を設
けたから、従来は１サイクル３０秒間内に燃料供給時間
が２１秒間あったものを９〜１５秒間に減らすと共に、
それに伴う燃焼空気も減らして実質的には単位時間当り
の燃焼量を減少できるし、バーナの歯ぬけがないから炉
内温度も均一になる。Further, since the holding time is provided between the switching of the burners, the fuel supply time which was conventionally 21 seconds within 30 seconds per cycle is reduced to 9 to 15 seconds.
As a result, the amount of combustion air per unit time can be reduced by reducing the amount of combustion air, and the temperature inside the furnace becomes uniform since there is no burnout in the burner.
【００１８】以上、本発明の実施例について説明した
が、本発明の趣旨の範囲を越えない限り種々の実施がで
きる。例えば、各電磁弁やダンパーの開閉制御はタイマ
ー制御を用いたり、炉内温度センサーからの信号又は抽
出直後の非加熱材の温度センサーからの信号を受けて温
度調節計からの出力信号によつて各電磁弁やダンパーの
開閉制御をしてもよい。Although the embodiments of the present invention have been described above, various embodiments can be made without departing from the scope of the present invention. For example, the opening / closing control of each solenoid valve and damper uses timer control, or receives a signal from a furnace temperature sensor or a signal from a non-heated material temperature sensor immediately after extraction, and outputs the signal from a temperature controller. Opening and closing control of each solenoid valve and damper may be performed.
【図１】 実施例のレジェネバーナ燃焼システムの要部
を表す説明図。FIG. 1 is an explanatory diagram illustrating a main part of a regenerative burner combustion system according to an embodiment.
【図２】 実施例の動作を表す説明図。FIG. 2 is an explanatory diagram illustrating an operation of the embodiment.
１…リジェネバーナ燃焼システム、３，４…蓄熱器、１
３，１４…燃料供給弁、２４，２５…燃焼空気供給弁、
３４，３５…燃焼排ガス排気弁、Ａ，Ｂ…バーナ。1: Regeneration burner combustion system, 3, 4: Regenerator, 1
3, 14 ... fuel supply valve, 24, 25 ... combustion air supply valve,
34, 35 ... exhaust gas exhaust valves, A, B ... burners.
Claims (3)
燃焼システムの低燃焼領域内の温度制御方法において、 バーナを燃焼から排気に切り替える際、まず燃焼側バー
ナの燃料供給弁を閉とし、次に該燃焼側バーナの燃焼空
気供給弁及び排気側バーナの排気弁を閉とし、その後所
定の保持時間に渡って、前記燃焼側及び排気側のバーナ
の各燃焼空気供給弁及び各排気弁をいずれも閉に保持し
続けた後、前記燃焼側バーナの排気弁及び前記排気側の
バーナの燃焼空気供給弁を開いて、バーナの燃焼側と排
気側とを切り替えることを特徴とするリジェネバーナ燃
焼システムの温度制御方法。In a temperature control method in a low combustion region of a regenerative burner combustion system having a burner and a regenerator, when a burner is switched from combustion to exhaust, first, a fuel supply valve of a combustion side burner is closed. The combustion air supply valve of the combustion side burner and the exhaust valve of the exhaust side burner are closed, and thereafter, for a predetermined holding time, both the combustion air supply valve and each exhaust valve of the combustion side and the exhaust side burner are closed. After maintaining the temperature of the regenerative burner combustion system, the exhaust valve of the combustion side burner and the combustion air supply valve of the exhaust side burner are opened to switch between the combustion side and the exhaust side of the burner. Control method.
テムの温度制御方法において、 前記保持時間をバーナの切替サイクル時間に対して１０
〜９０％の範囲としたことを特徴とするリジェネバーナ
燃焼システムの温度制御方法。2. The method for controlling a temperature of a regenerative burner combustion system according to claim 1, wherein the holding time is set to 10 times a burner switching cycle time.
A temperature control method for a regenerative burner combustion system, wherein the temperature is set in the range of 90% to 90%.
焼システムの温度制御方法において、 前記バーナの切替サイクル時間を３０秒としたとき、燃
料の供給時間を９〜１５秒間とし、前記保持時間を８〜
１４秒間としたことを特徴とするリジェネバーナ燃焼シ
ステムの温度制御方法。3. The temperature control method for a regenerative burner combustion system according to claim 1, wherein the switching cycle time of the burner is 30 seconds, the fuel supply time is 9 to 15 seconds, and the holding time is 8 ~
A temperature control method for a regenerative burner combustion system, wherein the temperature is set to 14 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8345626A JPH10185180A (en) | 1996-12-25 | 1996-12-25 | Temperature control method for regenerative burner combustion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8345626A JPH10185180A (en) | 1996-12-25 | 1996-12-25 | Temperature control method for regenerative burner combustion system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10185180A true JPH10185180A (en) | 1998-07-14 |
Family
ID=18377883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8345626A Pending JPH10185180A (en) | 1996-12-25 | 1996-12-25 | Temperature control method for regenerative burner combustion system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10185180A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100447491C (en) * | 2007-02-06 | 2008-12-31 | 顾向涛 | Inverting time control method for heat accumulation type burner |
| CN102865741A (en) * | 2012-09-27 | 2013-01-09 | 北京慧研义和科技有限公司 | Metal magnesium and calcium reduction furnace thermal storage combustion system and control method thereof |
| CN112146447A (en) * | 2020-09-15 | 2020-12-29 | 广西柳州钢铁集团有限公司 | Method for preventing ash spraying of air release valve of double-chamber kiln |
-
1996
- 1996-12-25 JP JP8345626A patent/JPH10185180A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100447491C (en) * | 2007-02-06 | 2008-12-31 | 顾向涛 | Inverting time control method for heat accumulation type burner |
| CN102865741A (en) * | 2012-09-27 | 2013-01-09 | 北京慧研义和科技有限公司 | Metal magnesium and calcium reduction furnace thermal storage combustion system and control method thereof |
| CN102865741B (en) * | 2012-09-27 | 2014-07-23 | 北京慧研义和科技有限公司 | Metal magnesium and calcium reduction furnace thermal storage combustion system and control method thereof |
| CN112146447A (en) * | 2020-09-15 | 2020-12-29 | 广西柳州钢铁集团有限公司 | Method for preventing ash spraying of air release valve of double-chamber kiln |
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