JP6497342B2 - Ignition determination method and ignition determination apparatus - Google Patents

Ignition determination method and ignition determination apparatus Download PDF

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JP6497342B2
JP6497342B2 JP2016049797A JP2016049797A JP6497342B2 JP 6497342 B2 JP6497342 B2 JP 6497342B2 JP 2016049797 A JP2016049797 A JP 2016049797A JP 2016049797 A JP2016049797 A JP 2016049797A JP 6497342 B2 JP6497342 B2 JP 6497342B2
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正洋 宇野
正洋 宇野
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JFE Steel Corp
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Description

本発明は、高炉ガスを燃料放散塔で燃焼放散するための技術に関する。   The present invention relates to a technique for burning and diffusing blast furnace gas in a fuel diffusion tower.

従来のガス点火の検知に関しては、例えば特許文献1に記載の着火検出方法がある。
特許文献1に記載の技術は、主バーナ及び着火装置である点火バーナにより発生する微小圧力振動を電気信号として取り出し、その取り出した電気信号が含む、燃焼音に対応する高周波成分の振動エネルギーと、気流音に対応する低周波成分の振動エネルギーとの、各振動エネルギーの絶対値と両者の比とに基づき、主バーナと点火バーナの各着火及び消火を判別することが記載されている。
しかし、この着火検出方法が、本発明が対象とする、高炉ガス(以下、Bガスとも呼ぶ)を燃焼放散する際における燃焼放散塔での点火判定に適用可能な不明である。
As for conventional gas ignition detection, for example, there is an ignition detection method described in Patent Document 1.
The technique described in Patent Document 1 takes out a minute pressure vibration generated by an ignition burner which is a main burner and an ignition device as an electric signal, and includes vibration energy of a high-frequency component corresponding to the combustion sound included in the extracted electric signal; It is described that each ignition and extinguishing of the main burner and the ignition burner is discriminated based on the absolute value of each vibration energy and the ratio between the vibration energy of the low frequency component corresponding to the airflow sound.
However, it is unclear that this ignition detection method can be applied to the ignition determination in the combustion diffusion tower when the blast furnace gas (hereinafter also referred to as B gas) targeted by the present invention is burned and diffused.

ここで、燃焼放散する高炉ガスは、水素含有率が低いことから着火性が悪い。このため、コークス炉ガス(以下、Cガスとも呼ぶ)も併せて燃焼放散塔に供給することで、高炉ガスの燃焼を担保している。また、燃焼放散塔に供給するCガスに着火装置(点火バーナ)で着火して点火することで、燃焼放散塔に供給される高炉ガス燃焼を実現している。
しかし、コークス炉ガスを着火しても、必ずしも燃焼放散塔内のコークス炉ガスに点火されたか否かの確実性がない。
Here, the blast furnace gas that burns and diffuses has poor ignitability because of its low hydrogen content. For this reason, coke oven gas (hereinafter also referred to as C gas) is also supplied to the combustion stripping tower to ensure combustion of the blast furnace gas. Also, blast furnace gas combustion supplied to the combustion diffusion tower is realized by igniting and igniting the C gas supplied to the combustion diffusion tower with an ignition device (ignition burner).
However, even if the coke oven gas is ignited, there is no certainty as to whether or not the coke oven gas in the combustion stripping tower has been ignited.

また従来、燃焼放散塔の温度が所定の点火推定温度以上となっているか否かで点火を判定する。しかし、高炉ガスの燃焼放散を中断してから、次の高炉ガスの燃焼開始までの時間が短い場合、燃焼放散塔の温度が、点火推定温度以上の場合も想定される。そのような場合には、燃焼放散塔内のコークス炉ガスが再点火しても、再度、高炉ガスが燃焼可能な状態になったか判別出来ない。このため、従来、確実な燃焼を確保しようとすると、例えば、高炉ガスの燃焼を行わない期間においても、コークス炉ガスを燃焼放散塔に供給して燃焼を継続させたままにするなどの方策を採用する必要があるが、このことはコークス炉ガスを無駄に消費することとなる。
なお、塔内の高炉ガスが燃焼しない場合には、生の高炉ガスを放散することになるという課題がある。
Conventionally, ignition is determined based on whether or not the temperature of the combustion diffusion tower is equal to or higher than a predetermined estimated ignition temperature. However, in the case where the time until the start of the combustion of the next blast furnace gas after the interruption of the combustion emission of the blast furnace gas is short, it may be assumed that the temperature of the combustion diffusion tower is equal to or higher than the estimated ignition temperature. In such a case, even if the coke oven gas in the combustion stripping tower is re-ignited, it cannot be determined whether the blast furnace gas has become combustible again. Therefore, conventionally, in order to ensure reliable combustion, for example, measures such as supplying coke oven gas to the combustion stripping tower and continuing combustion even during a period when combustion of the blast furnace gas is not performed are taken. Although it is necessary to adopt, this will waste coke oven gas.
In addition, when the blast furnace gas in a tower does not burn, there exists a subject that raw blast furnace gas will be diffused.

特許第2922770号公報Japanese Patent No. 2922770

本発明は、上記のような点に着目したもので、簡易な手段によって、燃焼放散塔内のガスへの点火を判定可能とすることを目的とする。   The present invention focuses on the above points, and an object of the present invention is to make it possible to determine ignition of a gas in a combustion diffusion tower by simple means.

課題を解決するために、本発明の一態様は、高炉ガスを燃焼放散塔で燃焼放散するに際し、コークス炉ガスをパイロットガスとして燃焼放散塔に供給し、その燃焼放散塔に供給されるコークス炉ガスに着火装置で着火することで上記燃焼放散塔での上記高炉ガスの燃焼を確保する際における、上記燃焼放散塔でのコークス炉ガスの点火を検出する点火判定方法であって、上記燃焼放散塔内の温度である塔内温度を検出する温度検出装置を備え、上記着火後から予め設定した時間内において、上記塔内温度が予め設定した点火推定温度以上となったと判定し、且つ上記塔内温度が着火時の温度よりも昇温したと判定すると、上記燃焼放散塔で高炉ガスが燃焼可能状態になったと判定する。
ここで、上記昇温は、例えば予め実験などで求めた、点火時に発生する温度勾配以上で温度上昇しているかで判定する。
In order to solve the problem, according to one aspect of the present invention, when blast furnace gas is burned and diffused in a combustion stripping tower, the coke oven gas is supplied as a pilot gas to the combustion stripping tower, and the coke oven supplied to the combustion stripping tower An ignition determination method for detecting ignition of coke oven gas in the combustion stripping tower when igniting the gas with an ignition device to ensure combustion of the blast furnace gas in the combustion stripping tower, A temperature detecting device for detecting the temperature in the tower, which is the temperature in the tower, and determining that the temperature in the tower is equal to or higher than a preset ignition estimated temperature within a preset time after the ignition, and the tower If it is determined that the internal temperature has risen above the temperature at the time of ignition, it is determined that the blast furnace gas has become combustible in the combustion diffusion tower.
Here, the above temperature rise is determined based on whether the temperature rises above a temperature gradient generated during ignition, which is obtained in advance through experiments or the like.

本発明の態様によれば、簡易な手段によって、燃焼放散塔内のガスの点火を判定可能となる。   According to the aspect of the present invention, it is possible to determine the ignition of the gas in the combustion diffusion tower by simple means.

本発明に基づく実施形態に係るガス燃焼放散設備を示す模式図である。It is a mimetic diagram showing gas combustion diffusion equipment concerning an embodiment based on the present invention. 点火判定の条件を説明するための概念図である。It is a conceptual diagram for demonstrating the conditions of ignition determination.

次に、本発明の実施形態について図面を参照しつつ説明する。
(構成)
本実施形態のガス燃焼放散設備は、図1に示すように、燃焼放散塔1に対し、放散ガス用管路2の下流端とパイロットガス用管路5の下流端がそれぞれ接続している。なお、パイロットガス用管路5の方が燃焼放散塔1の上部に接続する。
放散ガス用管路2には、適宜、高炉ガスが供給される。その放散ガス用管路2の途中位置には、遮断弁4および流量調整弁3が配置されていて、これらの弁4,3によって、燃焼放散塔1へのBガスの供給・供給停止、および供給流量が調整可能となっている。
Next, embodiments of the present invention will be described with reference to the drawings.
(Constitution)
As shown in FIG. 1, in the gas combustion / dissipation facility of this embodiment, the downstream end of the diffused gas pipe 2 and the downstream end of the pilot gas pipe 5 are connected to the combustion / diffusing tower 1. The pilot gas pipe 5 is connected to the upper part of the combustion diffusion tower 1.
Blast furnace gas is appropriately supplied to the stripping gas pipe 2. A shutoff valve 4 and a flow rate adjusting valve 3 are arranged at a midway position of the stripping gas pipe 2, and by these valves 4, 3, supply / stop of supply of B gas to the combustion stripping tower 1, and The supply flow rate can be adjusted.

パイロットガス用管路5の途中位置には、遮断弁7および流量調整弁6が配置されていて、これらの弁7,6によって、燃焼放散塔1へのCガスの供給・供給停止、および供給流量が調整可能となっている。更に、パイロットガス用管路5の、流量調整弁6よりも燃焼放散塔1側(下流側位置には、着火バーナなどからなる着火装置8が配置されている。着火装置8は、着火指令を入力すると、燃焼放散塔1に供給するCガスに対する着火処理を実施する。
また燃焼放散塔1の上部側には、温度検出センサ9が設置されている。温度検出センサ9は、燃焼放散塔1内の温度(以下、塔内温度とも呼ぶ)を検出し、その検出した温度情報を点火判定部10に供給する。
A shutoff valve 7 and a flow rate adjusting valve 6 are disposed in the middle of the pilot gas pipe 5, and supply, supply stop, and supply of C gas to the combustion diffusion tower 1 are performed by these valves 7, 6. The flow rate can be adjusted. Further, an ignition device 8 made of an ignition burner or the like is disposed on the pilot gas pipe line 5 on the side of the combustion-dissipating tower 1 from the flow rate adjustment valve 6 (at a downstream position. The ignition device 8 issues an ignition command. If input, the ignition process with respect to C gas supplied to the combustion diffusion tower 1 will be implemented.
A temperature detection sensor 9 is installed on the upper side of the combustion diffusion tower 1. The temperature detection sensor 9 detects the temperature in the combustion diffusion tower 1 (hereinafter also referred to as the tower temperature) and supplies the detected temperature information to the ignition determination unit 10.

点火判定部10は、着火装置8が着火指令による着火開始から予め設定した時間(、点火が確認可能な時間、例えば10秒)の間、温度検出センサ9の検出値に基づき、燃焼放散塔1に供給されたCガスが点火したか否かを判定する。即ち、Bガスを燃焼可能な状態になったか否かを判定する。
本実施形態の点火判定部10は、図2に示すような、下記2つの条件(条件1及び条件2)の両方を満足する場合に、燃焼放散塔1に供給されたCガスが点火してBガスの燃焼可能状態になったと判定し、2つの条件のいずれかを満足しない場合には、燃焼放散塔1内のCガスが点火していないと判定する。
The ignition determination unit 10 is based on the detection value of the temperature detection sensor 9 for a preset time from the start of ignition by the ignition command by the ignition device 8 (a time during which ignition can be confirmed, for example, 10 seconds). It is determined whether or not the C gas supplied to is ignited. That is, it is determined whether or not the B gas can be combusted.
The ignition determination unit 10 of the present embodiment ignites the C gas supplied to the combustion diffusion tower 1 when both of the following two conditions (condition 1 and condition 2) are satisfied as shown in FIG. If it is determined that the B gas can be combusted and one of the two conditions is not satisfied, it is determined that the C gas in the combustion diffusion tower 1 is not ignited.

条件1:塔内温度が予め設定した点火推定温度以上である。
(点火推定温度は、例えば100℃である。)
条件2:着火により着火時よりも塔内温度が昇温した。
ここで、上記昇温の判定は、例えば、予め実験などによって、塔内のCガスが点火することで、塔内の温度が上昇する際の温度勾配を求めておき、その温度勾配以上で温度上昇しているときに昇温と判定する。
または、点火判定部10は、着火前後の塔内温度が点火推定温度未満の場合には、点火推定温度以上で且つ着火前後の塔内温度よりも予め設定した温度以上高くなったときに、高炉ガスが点火して燃焼状態になったと判定するようにしても良い。また、点火判定部10は、着火前後の塔内温度が点火推定温度以上の場合には、その着火前後の塔内温度よりも予め設定した温度以上高くなったときに(条件2)、高炉ガスが点火して燃焼状態になったと判定するようにしても良い。予め設定した温度とは、有意に、新たなCガスの点火を推定可能なだけの温度上昇分であって、例えば40℃である。
Condition 1: The tower internal temperature is equal to or higher than a preset ignition estimated temperature.
(The estimated ignition temperature is, for example, 100 ° C.)
Condition 2: The temperature in the tower was raised by ignition than when ignited.
Here, the determination of the temperature rise is, for example, by previously obtaining a temperature gradient when the temperature in the tower rises by igniting the C gas in the tower by an experiment or the like. When it is rising, it is determined that the temperature has risen.
Alternatively, when the temperature in the tower before and after the ignition is lower than the estimated ignition temperature, the ignition determination unit 10 determines whether the blast furnace is equal to or higher than the estimated ignition temperature and higher than a predetermined temperature before and after the ignition. It may be determined that the gas has been ignited and is in a combustion state. Further, when the temperature in the tower before and after ignition is equal to or higher than the estimated ignition temperature, the ignition determination unit 10 determines that the blast furnace gas is higher than the preset temperature in the tower before and after ignition (condition 2). It may be determined that is in a combustion state after ignition. The preset temperature is a temperature rise that can significantly estimate the ignition of new C gas, for example, 40 ° C.

点火判定部10は、高炉ガスが点火していないと判定した場合に、着火装置8に着火指令を供給するようにしても良い。
ここで、本実施形態では、コンピュータの制御部からなる点火判定部10で、上記2つの条件を満足したか否かを判定する場合を例示しているが、これに限定されない。例えば作業員が、温度検出センサ9が検出した温度を表示部などで確認して、上記の2つの条件を満足したか判定するようにしても良い。
The ignition determination unit 10 may supply an ignition command to the ignition device 8 when it is determined that the blast furnace gas is not ignited.
Here, in this embodiment, the case where the ignition determination unit 10 including the control unit of the computer determines whether or not the two conditions are satisfied is illustrated, but the present invention is not limited to this. For example, an operator may check the temperature detected by the temperature detection sensor 9 on a display unit or the like, and determine whether the above two conditions are satisfied.

(動作その他)
高炉で発生した高炉ガスは、各種のガス使用設備に供給されて再利用されるが、再利用しきれない高炉ガスは、一時的にガスホルダに貯留される。そのよう処理を行っても、対応しきれない高炉ガスは、燃焼放散塔1で燃焼されて放散される。
このようにBガスの燃焼放散が必要になったとみなすと、先ず、遮断弁7を開け且つ流量調整弁6を調整して、所定量のCガスをパイロットガス用管路5に供給すると共に、着火装置8に着火指令を供給して、Cガスの点火を行う。
(Operation other)
The blast furnace gas generated in the blast furnace is supplied to various gas use facilities and reused, but the blast furnace gas that cannot be reused is temporarily stored in the gas holder. Even if such a process is performed, the blast furnace gas that cannot be handled is burned in the combustion diffusion tower 1 and diffused.
Assuming that the B gas needs to be burned and diffused in this way, first, the shut-off valve 7 is opened and the flow rate adjusting valve 6 is adjusted to supply a predetermined amount of C gas to the pilot gas conduit 5. An ignition command is supplied to the ignition device 8 to ignite C gas.

このとき本実施形態では、点火判定部10が、着火によって、燃焼放散塔1の温度が所定温度以上となり且つ昇温したと判定したら、燃焼放散塔1がBガスの燃焼可能状態となったと判定する。
ここで、燃焼放散塔1がBガスの燃焼可能状態になっていないと判定したら、再度着火処理を行う。
また点火判定部10が、燃焼放散塔1がBガスの燃焼可能状態となったと判定したら、遮断弁4を開け且つ流量調整弁3を調整して、燃焼放散塔1にBガスを供給して、燃焼放散塔1を介したBガスの燃焼放散を行う。
At this time, in the present embodiment, if the ignition determination unit 10 determines that the temperature of the combustion stripping tower 1 is equal to or higher than the predetermined temperature and has been raised due to ignition, it is determined that the combustion stripping tower 1 is in a B gas combustible state. To do.
Here, if it determines with the combustion-dissipation tower 1 not being in the combustion possible state of B gas, an ignition process will be performed again.
When the ignition determination unit 10 determines that the combustion diffusion tower 1 is in a B gas combustible state, the shutoff valve 4 is opened and the flow rate adjustment valve 3 is adjusted to supply the B gas to the combustion diffusion tower 1. Then, the B gas is burned and diffused through the burning and diffusing tower 1.

また、Bガスの燃焼を終了する場合には、Bガス側の流量調整弁3を閉じた後に、Cガス側の流量調整弁6を閉じて、消火する。
以上のように、本実施形態によれば、簡易な手段によって、燃焼放散塔1内のCガスの点火をより確実に判定可能となる。
このため、Bガスの燃焼を行わない場合に、Cガスを燃焼放散塔1内に供給して燃焼状態を維持しておく必要が無くなり、Bガスの燃焼放散のために使用される、コークス炉ガス使用量を削減することが可能となる。
When the combustion of the B gas is ended, the B gas side flow rate adjusting valve 3 is closed, and then the C gas side flow rate adjusting valve 6 is closed to extinguish the fire.
As described above, according to the present embodiment, the ignition of the C gas in the combustion-dispersion tower 1 can be more reliably determined by simple means.
For this reason, when combustion of B gas is not performed, it is not necessary to supply the C gas into the combustion diffusion tower 1 and maintain the combustion state, and the coke oven used for combustion emission of B gas is eliminated. It becomes possible to reduce the amount of gas used.

1 燃焼放散塔
2 放散ガス用管路
3 流量調整弁
4 遮断弁
5 パイロットガス用管路
6 流量調整弁
7 遮断弁
8 着火装置
9 温度検出センサ
10 点火判定部
DESCRIPTION OF SYMBOLS 1 Combustion / dissipation tower 2 Dissipated gas line 3 Flow rate adjusting valve 4 Shut-off valve 5 Pilot gas line 6 Flow rate adjusting valve 7 Shut-off valve 8 Ignition device 9 Temperature detection sensor 10 Ignition determination unit

Claims (2)

高炉ガスを燃焼放散塔で燃焼放散するに際し、コークス炉ガスをパイロットガスとして燃焼放散塔に供給し、その燃焼放散塔に供給されるコークス炉ガスに着火装置で着火することで上記燃焼放散塔での上記高炉ガスの燃焼を確保する際における、上記燃焼放散塔でのコークス炉ガスの点火を検出する点火判定方法であって、
上記燃焼放散塔内の温度である塔内温度を検出する温度検出装置を備え、
上記着火後から予め設定した時間内において、上記塔内温度が予め設定した点火推定温度以上となったと判定し、且つ上記塔内温度が上記着火時の温度よりも昇温したと判定すると、上記燃焼放散塔でコークス炉ガスが点火され、上記燃焼放散塔での高炉ガスの燃焼が可能状態になったと判定することを特徴とする点火判定方法。
When the blast furnace gas is burned and diffused in the combustion stripping tower, the coke oven gas is supplied to the combustion stripping tower as a pilot gas, and the coke oven gas supplied to the combustion stripping tower is ignited by an igniting device. An ignition determination method for detecting ignition of coke oven gas in the combustion stripping tower when ensuring combustion of the blast furnace gas,
A temperature detection device for detecting the temperature in the tower, which is the temperature in the combustion diffusion tower,
Within a preset time after the ignition, when the tower temperature is determined to become preset ignition estimated temperature or above and the tower temperature is determined and the temperature was raised than the temperature at the time of the ignition, the An ignition determination method comprising: determining that coke oven gas has been ignited in a combustion stripping tower and combustion of blast furnace gas in the combustion stripping tower has become possible.
高炉ガスを燃焼放散塔で燃焼放散するに際し、コークス炉ガスをパイロットガスとして燃焼放散塔に供給し、その供給されるコークス炉ガスに着火装置で着火することで上記燃焼放散塔での上記高炉ガスの燃焼を確保する際における、上記燃焼放散塔でのコークス炉ガスの点火を検出する点火判定装置であって、
上記燃焼放散塔内の温度である塔内温度を検出する温度検出センサと、
上記温度検出センサの検出温度に基づき、上記着火後から予め設定した時間内において、上記塔内温度が予め設定した点火推定温度以上になったと判定し、且つ上記塔内温度が上記着火時の温度よりも昇温したと判定すると、上記燃焼放散塔でコークス炉ガスが点火され、上記燃焼放散塔で高炉ガスが燃焼可能状態になったと判定する点火判定部と、を備えることを特徴とする点火判定装置。
When blast furnace gas is burned and diffused in the combustion stripping tower, the coke oven gas is supplied to the combustion stripping tower as a pilot gas, and the supplied coke oven gas is ignited by an ignition device so that the blast furnace gas in the combustion stripping tower is ignited. An ignition determination device that detects ignition of coke oven gas in the combustion stripping tower when ensuring combustion of
A temperature detection sensor for detecting the temperature in the tower, which is the temperature in the combustion diffusion tower,
Based on the temperature detected by the temperature detection sensor, it is determined that the temperature in the tower is equal to or higher than the preset ignition estimated temperature within a preset time after the ignition, and the temperature in the tower is the temperature at the time of ignition. And an ignition determination unit that determines that the coke oven gas is ignited in the combustion stripping tower and the blast furnace gas is in a combustible state in the combustion stripping tower. Judgment device.
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