JP5545015B2 - Clogging judgment method for cooling water supply piping in continuous casting equipment - Google Patents
Clogging judgment method for cooling water supply piping in continuous casting equipment Download PDFInfo
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本発明は、製鋼工場の連続鋳造設備において、放射温度計を用いて二次冷却スプレーのノズル詰まりに起因する冷却水供給配管詰まりを判定し、冷却水供給配管の詰まりが発生した位置を特定する方法に関する。 The present invention uses a radiation thermometer in a continuous casting facility of a steel factory to determine clogging of a cooling water supply pipe caused by nozzle clogging of a secondary cooling spray, and identify a position where the cooling water supply pipe is clogged. Regarding the method.
連続鋳造機に付帯する二次冷却スプレーノズル（以下、「スプレーノズル」又は「ノズル」と称する場合がある）は、現場工程において高温、高湿、高粉塵環境下で使用されるため、スプレーノズルの先端が詰まって、水流がスプレーノズルから噴出しないか、又は十分な水流が供給されずスラブの冷却が不均一な状態となる頻度が多く発生する場合がある。かかる状況では、連鋳スラブの内部の凝固が不均一となり、スラブの表面及び内部で割れが発生する原因となり、スラブ材質の品質上の問題のみならず、連続鋳造操業上のトラブルが発生しやすくなる。したがって、二次冷却スプレーノズル詰まりを迅速に判定し、ノズル詰まりが発生した位置を簡便に特定する方法が望まれている。
たとえば、特許文献１には、ノズルへの供給圧力と流量の関係を監視することで、ノズル詰まりを判別する方法が開示されている。また、スプレー冷却されているスラブの表面温度変化の推移を測定し、ノズル詰まりを検知する方法が特許文献２に開示されている。
Secondary cooling spray nozzles (hereinafter sometimes referred to as “spray nozzles” or “nozzles”) attached to continuous casting machines are used in high-temperature, high-humidity, high-dust environments in field processes. In many cases, the tip of the slab is clogged, and the water flow is not ejected from the spray nozzle, or the slab is not uniformly cooled due to insufficient supply of water flow. In such a situation, the solidification inside the continuous cast slab becomes uneven, causing cracks on the surface and inside of the slab, and not only problems with the quality of the slab material but also problems with continuous casting operations. Become. Therefore, a method for quickly determining secondary cooling spray nozzle clogging and simply specifying the position where nozzle clogging has occurred is desired.
For example, Patent Document 1 discloses a method of determining nozzle clogging by monitoring the relationship between the supply pressure to the nozzle and the flow rate. Further, Patent Document 2 discloses a method of detecting nozzle clogging by measuring the transition of the surface temperature change of a slab that is spray-cooled.
しかし、これら方法では、二次冷却スプレーノズルがスラブの幅方向に左右対称に設置されている場合であっても、実測されるスラブの表面温度分布は左右対称にならない場合があり、また、ノズル詰まりと表面温度分布との相関は明らかではないという問題点があった。さらに、スプレーノズルの詰まりの発生ゾーン又はノズルが配管される二次冷却水供給配管（以下、単に「冷却水供給配管」という場合もある。）の配管配置位置とスラブ表面温度分布の相関が判明すればスプレーノズルの不具合が早期に検出でき、連続鋳造操業での保全効率の向上にも資する。 However, in these methods, even when the secondary cooling spray nozzle is installed symmetrically in the width direction of the slab, the surface temperature distribution of the measured slab may not be symmetrical, and the nozzle There was a problem that the correlation between clogging and surface temperature distribution was not clear. Furthermore, the correlation between the slab surface temperature distribution and the piping arrangement position of the spray nozzle clogging zone or the secondary cooling water supply pipe (hereinafter sometimes simply referred to as “cooling water supply pipe”) to which the nozzle is piped is found. If this is done, problems with the spray nozzle can be detected at an early stage, which contributes to the improvement of maintenance efficiency in continuous casting operations.
本発明は、連続鋳造機の外すなわち、二次冷却帯をスラブが通過する直後に設置した放射温度計によるスラブの表面の温度分布を観測し、スラブの表面の温度分布がスラブ幅方向に対称か否かを監視し、スラブの表面の温度分布の測定からノズルに配管されている冷却水供給配管の詰まりを判定し、かつノズル詰まりが起こったゾーン又はノズルが配管される冷却水供給配管の位置を特定することを目的とする。 The present invention observes the temperature distribution on the surface of the slab by a radiation thermometer installed outside the continuous casting machine, that is, immediately after the slab passes through the secondary cooling zone, and the temperature distribution on the surface of the slab is symmetrical in the slab width direction. Whether the cooling water supply pipe connected to the nozzle is clogged from the measurement of the temperature distribution on the surface of the slab, and the zone where the nozzle is clogged or the cooling water supply pipe where the nozzle is connected The purpose is to specify the position.
本発明は、前記課題を解決するために、連続鋳造機外に出た直後、すなわち、二次冷却帯をスラブが通過した直後に設置した放射温度計によりスラブ表面温度を測定する事で、スラブの表面の温度分布がスラブ幅方向に対して左右対称か否かを監視することを行うことを特徴の一つとしている。ここで、連続鋳造機外に出た直後とは、すなわち、図１にて１０ゾーンを通過して、二次冷却帯の外に出て、スラブ搬送領域に入り、スラブを視認できた時期をいう。 In order to solve the above problems, the present invention measures the slab surface temperature by using a radiation thermometer installed immediately after going out of the continuous casting machine, that is, immediately after the slab passes through the secondary cooling zone. One of the features is to monitor whether or not the temperature distribution on the surface is symmetrical with respect to the slab width direction. Here, immediately after going out of the continuous casting machine, that is, after passing through the 10 zones in FIG. 1, going out of the secondary cooling zone, entering the slab conveyance area, and the time when the slab was visible. Say.
さらに、本発明は、各ゾーンに配置される複数の異なる冷却水供給配管の冷却水量を実測し、さらに冷却水供給配管の背圧値から、冷却水量理論値を算出し、これと実績冷却水量とを比較することで、冷却水量理論値が実績冷却水量より多い場合に、ノズル詰まりが発生したと判定し、その発生したゾーンを特定することを特徴とする。 Further, the present invention measures the cooling water amount of a plurality of different cooling water supply pipes arranged in each zone, further calculates the theoretical value of the cooling water amount from the back pressure value of the cooling water supply pipe, and the actual cooling water amount. Is compared, it is determined that nozzle clogging has occurred when the theoretical value of the cooling water amount is greater than the actual cooling water amount, and the zone in which the clogging has occurred is specified.
本発明の具体的構成を以下に示す。
（１）連続鋳造機の二次冷却帯の冷却ゾーン毎にスラブの幅方向に対称に配置された複数の二次冷却スプレーノズルが接続された冷却水供給配管を前記冷却ゾーン毎に複数備える連続鋳造機における冷却水供給配管の詰まりの位置を特定する方法であって、
前記スラブが前記二次冷却帯を通過した直後、放射温度計を用いて前記スラブの表面の温度分布を測定する工程と、
該温度分布がスラブ幅方向に対称か否かを判断する工程とを有し、
該判断する工程において対称でないと判断した場合には、さらに、
前記複数の冷却水供給配管系統から流れる実際の水量を測定する工程と、
前記冷却水供給配管毎の背圧値を測定する工程と、
該背圧値を用いて前記冷却水供給配管毎の理論二次冷却水量を算出する工程と、
前記実際の水量と前記理論二次冷却水量を前記冷却水供給配管毎に比較し、理論二次冷却水量が大きい場合には、大きい結果となった冷却水供給配管の冷却水路に詰まりが生じていると判定する工程とを有する連続鋳造機における冷却水供給配管の詰まりの位置を特定する方法。
（２）前記放射温度計が二次元放射温度計であることを特徴とする（１）に記載の連続鋳造機における冷却水供給配管の詰まりの位置を特定する方法。
（３）前記温度分布がスラブ幅方向に対称か否かを判断する工程において、前記スラブの表面の温度分布が幅方向の左右の領域のそれぞれの最高温度の温度差が任意の設定温度以上の場合に、前記温度分布がスラブ幅方向に対称でないと判断する（１）または（２）に記載の連続鋳造機における冷却水供給配管の詰まりの位置を特定する方法。
A specific configuration of the present invention is shown below.
(1) Continuously provided with a plurality of cooling water supply pipes connected to a plurality of secondary cooling spray nozzles arranged symmetrically in the width direction of the slab for each cooling zone of the secondary cooling zone of the continuous casting machine. A method for identifying a clogged position of a cooling water supply pipe in a casting machine,
Immediately after the slab passes through the secondary cooling zone, measuring the temperature distribution of the surface of the slab using a radiation thermometer;
Determining whether the temperature distribution is symmetric in the slab width direction,
If it is determined that the determination process is not symmetrical,
Measuring the actual amount of water flowing from the plurality of cooling water supply piping systems;
Measuring a back pressure value for each cooling water supply pipe;
Calculating the theoretical secondary cooling water amount for each cooling water supply pipe using the back pressure value;
The actual water amount and the theoretical secondary cooling water amount are compared for each cooling water supply pipe. When the theoretical secondary cooling water amount is large, the cooling water passage of the cooling water supply pipe that has resulted in a large blockage has occurred. And a step of determining that the cooling water supply pipe is clogged in the continuous casting machine.
(2) The method for identifying the clogging position of the cooling water supply pipe in the continuous casting machine according to (1), wherein the radiation thermometer is a two-dimensional radiation thermometer.
(3) In the step of determining whether or not the temperature distribution is symmetric in the width direction of the slab, the temperature distribution on the surface of the slab has a temperature difference between the maximum temperatures of the left and right regions in the width direction equal to or greater than an arbitrary set temperature. In this case, the method of determining the clogging position of the cooling water supply pipe in the continuous casting machine according to (1) or (2), wherein the temperature distribution is determined not to be symmetric in the slab width direction.
本発明は、連続鋳造機の二次冷却スプレーノズルに配管されている冷却水供給配管の詰まりを判定し、かつノズル詰まりが起こったゾーン又はノズルが配管される冷却水供給配管の位置を簡便に特定することができ、保全作業に役立てことができる。 The present invention determines the clogging of the cooling water supply pipe piped to the secondary cooling spray nozzle of the continuous casting machine, and easily positions the cooling water supply pipe where the nozzle clogged or the nozzle is piped. Can be identified and can be used for maintenance work.
以下、本発明の実施の形態を図面に基づき説明する。
連続鋳造機本体は、例えば、第１図に示すように、モールド及び複数のガイドロールで構成される１９台のセグメントと呼ばれるユニットで構成されている。また、この例では、連続鋳造機を１０のゾーンに区分し、各ゾーンの内側・外側からの冷却水量とそれに伴うスプレー背圧を測定し監視している。スプレー背圧の測定及び制御並びに二次冷却スプレーの制御は幅切り制御とよばれる制御方法が行われている。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
For example, as shown in FIG. 1, the continuous casting machine main body is composed of 19 units called a segment composed of a mold and a plurality of guide rolls. In this example, the continuous casting machine is divided into 10 zones, and the amount of cooling water from the inside and outside of each zone and the spray back pressure associated therewith are measured and monitored. Measurement and control of the spray back pressure and control of the secondary cooling spray are performed by a control method called width control.
ここで、幅切り制御とは、むだ水抑止、スラブの割れ発生抑止のため、図２に示すように各ゾーンにおいてスプレーを幅方向に３つのスプレー群（以下、「ルート」ともいう。）毎に分割し、鋳造するスラブ幅によって各ルートの遮断弁を開閉する制御をいう。例えば、図２において、スプレーノズル１３への冷却水供給配管１４は、ルート１，２，３の３つの系統に分かれており、ルート１が鋳造可能な最大幅の鋳片に対してその中央部を冷却し、ルート３がその端部を冷却し、ルート２がルート１とルート３との間を冷却するように構成されている。第１ゾーンから第１０ゾーンまでの各冷却ゾーンで、それぞれ独立して二次冷却水の供給量が調整可能となっているのみならず、各冷却ゾーンのルート１，２，３の３つの系統でも独立して二次冷却水供給配管が配備されており、独立の冷却水の供給量が調整可能となっている。したがって、冷却水の供給に関しては、表現上、ルート毎とは、すなわち二次冷却水供給配管毎と同様な意味で用いる場合がある。 Here, the width cutting control is to suppress waste water and slab cracking, and to spray each of three spray groups in the width direction (hereinafter also referred to as “route”) in each zone as shown in FIG. The control which opens and closes the shutoff valve of each route according to the width of the slab to be divided and cast. For example, in FIG. 2, the cooling water supply pipe 14 to the spray nozzle 13 is divided into three systems of routes 1, 2, and 3. , Route 3 cools its end, and route 2 cools between route 1 and route 3. In each cooling zone from the first zone to the tenth zone, not only the supply amount of secondary cooling water can be adjusted independently, but also three systems of routes 1, 2, and 3 of each cooling zone However, a secondary cooling water supply pipe is provided independently, and the independent cooling water supply amount can be adjusted. Therefore, regarding the supply of the cooling water, in terms of expression, each route may be used in the same meaning as for each secondary cooling water supply pipe.
本発明は、前提として、連続鋳造機の二次冷却帯が複数のゾーンからなり、該ゾーンはスラブの幅方向に対称に配置された複数の二次冷却スプレーノズル群を備え、該複数の二次冷却スプレーノズル群は各々群毎に異なる冷却水供給配管に接続された冷却設備を用いた二次冷却制御を行う工程において適用される。この条件を具備すれば、垂直曲げ方式、垂直式又はＳ字式等の連続鋳造方式に適用できる。 The present invention is based on the premise that the secondary cooling zone of the continuous casting machine is composed of a plurality of zones, and the zones are provided with a plurality of secondary cooling spray nozzle groups arranged symmetrically in the width direction of the slab. The secondary cooling spray nozzle group is applied in a process of performing secondary cooling control using a cooling facility connected to a different cooling water supply pipe for each group. If this condition is satisfied, it can be applied to a continuous casting system such as a vertical bending system, a vertical system, or an S-shaped system.
本発明によれば、まず連続鋳造機外に搬送された直後、すなわち二次冷却帯をスラブが通過した直後のスラブの表面の温度分布を放射温度計で測定する。放射温度計を用いるのは、スラブが凝固し、冷却される過程の温度が高精度かつ容易に測定できるので、特に適しており、２次元の放射温度計であればスラブ表面の温度の分布を効率良く観察測定できるので好ましい。また、スラブが通過した直後の放射温度計による温度分布を測定するとは、当該スラブの先端が二次冷却帯を通過したときに放射温度計にてスラブの表面の温度分布の測定を開始し、スラブの後端が通過するまで続ける操作を意味する。 According to the present invention, first, the temperature distribution on the surface of the slab immediately after being conveyed out of the continuous casting machine, that is, immediately after the slab has passed through the secondary cooling zone, is measured with a radiation thermometer. The use of a radiation thermometer is particularly suitable because the temperature of the process in which the slab solidifies and is cooled can be measured with high accuracy and ease, and a two-dimensional radiation thermometer can be used to determine the temperature distribution on the surface of the slab. This is preferable because observation and measurement can be performed efficiently. Also, to measure the temperature distribution with a radiation thermometer immediately after the slab has passed, when the tip of the slab has passed the secondary cooling zone, start measuring the temperature distribution on the surface of the slab with the radiation thermometer, It means an operation that continues until the rear end of the slab passes.
該温度分布がスラブ幅方向に対称か否かを判断するのは、スラブの表面の温度分布を、デイスプレイ等により映像化して観測することもできるが、コンピュータによりデジタル処理して、次工程のシーケンス制御及び分散制御処理に供することが好ましい。 Whether the temperature distribution is symmetric in the slab width direction can be determined by visualizing the temperature distribution on the surface of the slab by using a display or the like. It is preferable to use for control and distributed control processing.
ここで、幅方向の測定温度間隔は、２次元の放射温度計を用いた場合であれば、２次元放射温度計の測定視野に対応するデイスプレイ上の１画素当たりの温度とした。 Here, in the case where a two-dimensional radiation thermometer is used, the measurement temperature interval in the width direction is a temperature per pixel on the display corresponding to the measurement field of view of the two-dimensional radiation thermometer.
また、スラブの長手方向の中心線に対して左右の領域の温度分布から、左右のスラブ１／２幅におけるピーク温度（最高温度）を決定し、この左右のピーク温度を比較してその温度差が任意の設定温度以上であった場合にはノズル詰まりが発生したと判断して次の工程に移行するように指示を出す。例えば、この任意の設定温度が１００℃以上であればノズル詰まりが生じている可能性が極めて高いといえるので、この温度を判断の基準値とすることが好ましい。 Also, the peak temperature (maximum temperature) in the left and right slab widths is determined from the temperature distribution of the left and right regions with respect to the longitudinal center line of the slab, and the temperature difference between the left and right peak temperatures is compared. Is higher than an arbitrary set temperature, it is determined that nozzle clogging has occurred, and an instruction is issued to proceed to the next step. For example, if this arbitrary set temperature is 100 ° C. or higher, it can be said that the possibility of nozzle clogging is extremely high, and this temperature is preferably used as a reference value for determination.
次の工程では、二次冷却水量の実績値と冷却水供給配管毎の背圧値を測定し、この背圧値を用いて二次冷却水量理論値を算出する。次に、各ルート毎、すなわち二次冷却水供給配管毎に二次冷却水量の実績値と算出した二次冷却水量理論値とを比較する。この結果、理論二次冷却水量が二次冷却水量の実績値よりも大きい冷却水供給配管の場合には、該当する冷却水供給配管の冷却水路に詰まりが生じていると判定する。この判定により、ノズル詰まり生じている発生ゾーンを特定することが出来る。 In the next step, the actual value of the secondary cooling water amount and the back pressure value for each cooling water supply pipe are measured, and the theoretical value of the secondary cooling water amount is calculated using this back pressure value. Next, the actual value of the secondary cooling water amount and the calculated secondary cooling water amount theoretical value are compared for each route, that is, for each secondary cooling water supply pipe. As a result, in the case of a cooling water supply pipe whose theoretical secondary cooling water quantity is larger than the actual value of the secondary cooling water quantity, it is determined that the cooling water passage of the corresponding cooling water supply pipe is clogged. By this determination, it is possible to identify the occurrence zone where nozzle clogging occurs.
以下、実施例により本発明を詳細に説明するが、本発明はこの実施例に限定されるものではない。 EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to this Example.
第３図に本発明に係る一実施形態であるシステム構成を、第４図には本発明に係る一実施形態である処理フロー図を示す。第４図には例えば、スラブ１／２幅左右における、最高温度を比較し、温度差が１００℃以上の場合を示す。スラブの表面の温度分布が幅方向左右の温度のピークの温度の差が１００℃以上の場合に、温度分布がスラブ幅方向に対称でないと判断して、処理を行うこともできる。 FIG. 3 shows a system configuration which is an embodiment according to the present invention, and FIG. 4 shows a processing flow diagram which is an embodiment according to the present invention. For example, FIG. 4 shows a case where the maximum temperature is compared between the left and right sides of the slab 1/2 width, and the temperature difference is 100 ° C. or more. When the temperature distribution of the temperature distribution on the surface of the slab is 100 ° C. or more, the temperature distribution on the left and right in the width direction can be determined to be not symmetrical in the slab width direction and the processing can be performed.
各冷却水供給配管からの冷却水量は下式で算出される。設置の冷却水供給配管型式より、任意の流量における背圧値が既知であることから、背圧実績値から想定される冷却水量を算出できる。 The amount of cooling water from each cooling water supply pipe is calculated by the following equation. Since the back pressure value at an arbitrary flow rate is known from the installed cooling water supply piping model, the amount of cooling water assumed from the back pressure actual value can be calculated.
Ｑ１＝Ｑ２×√（Ｐ１／Ｐ２）
Ｑ１：理論二次冷却水量
Ｑ２：冷却水供給配管の背圧値がＰ２の時の設定冷却水量
Ｐ１：冷却水供給配管の実績の背圧値
Ｐ２：任意の流量での設定冷却水供給配管の背圧値
スラブ幅方向において非対称な表面温度分布を示すスラブを検知した場合、当該表面のプロセス実績（各ゾーンでの冷却水量）より、シーケンス制御および計装ＤＣＳ（分散制御システム）により、各ルートの冷却水供給配管毎の冷却水量を算出が実行される。同時に冷却水供給配管毎の背圧値より想定される各ルートの冷却水供給配管毎を算出し、比較することで、ノズル詰まりを起こしている該当ルートを特定する。
Q 1 = Q 2 × √ (P 1 / P 2 )
Q 1 : Theoretical secondary cooling water amount
Q 2: Set the amount of cooling water P 1 at the time of the back pressure value of the cooling water supply pipe P 2: the back of the performance of the cooling water supply pipe pressure value P 2: backpressure value of the set cooling water supply pipe in any of the flow rate When a slab showing an asymmetric surface temperature distribution in the slab width direction is detected, the cooling water of each route is detected by sequence control and instrumentation DCS (distributed control system) based on the process results (cooling water amount in each zone) of the surface. Calculation of the amount of cooling water for each supply pipe is executed. At the same time, each cooling water supply pipe for each route assumed from the back pressure value for each cooling water supply pipe is calculated and compared to identify the corresponding route causing nozzle clogging.
１２ スラブ
１３ スプレーノズル
１４ 冷却水供給配管
12 Slab 13 Spray nozzle 14 Cooling water supply piping
Claims (3)
前記スラブが前記二次冷却帯を通過した直後、放射温度計を用いて前記スラブの表面の温度分布を測定する工程と、
該温度分布がスラブ幅方向に対称か否かを判断する工程とを有し、
該判断する工程において対称でないと判断した場合には、さらに、
前記複数の冷却水供給配管から流れる実際の水量を測定する工程と、
前記冷却水供給配管毎の背圧値を測定する工程と、
該背圧値を用いて前記冷却水供給配管毎の理論二次冷却水量を算出する工程と、
前記実際の水量と前記理論二次冷却水量を前記冷却水供給配管毎に比較し、理論二次冷却水量が大きい場合には、大きい結果となった冷却水供給配管の冷却水路に詰まりが生じていると判定する工程とを有する連続鋳造機における冷却水供給配管の詰まりの位置を特定する方法。 In a continuous casting machine comprising a plurality of cooling water supply pipes connected to a plurality of secondary cooling spray nozzles arranged symmetrically in the width direction of the slab for each cooling zone of a secondary cooling zone of the continuous casting machine. A method for identifying the position of a clogged cooling water supply pipe,
Immediately after the slab passes through the secondary cooling zone, measuring the temperature distribution of the surface of the slab using a radiation thermometer;
Determining whether the temperature distribution is symmetric in the slab width direction,
If it is determined that the determination process is not symmetrical,
Measuring the actual amount of water flowing from the plurality of cooling water supply pipes ;
Measuring a back pressure value for each cooling water supply pipe;
Calculating the theoretical secondary cooling water amount for each cooling water supply pipe using the back pressure value;
The actual water amount and the theoretical secondary cooling water amount are compared for each cooling water supply pipe. When the theoretical secondary cooling water amount is large, the cooling water passage of the cooling water supply pipe that has resulted in a large blockage has occurred. And a step of determining that the cooling water supply pipe is clogged in the continuous casting machine.
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| JPS6384751A (en) * | 1986-09-29 | 1988-04-15 | Kobe Steel Ltd | Method for detecting clogging of spray nozzle for continuous casting |
| JPS63290670A (en) * | 1987-05-22 | 1988-11-28 | Kawasaki Steel Corp | Method for detecting clogging of spray nozzle for secondary cooling of continuously cast slab of steel |
| JPH05185196A (en) * | 1991-11-13 | 1993-07-27 | Aichi Steel Works Ltd | Method for monitoring crogging condition of spray nozzle for continuous casting |
| JPH0740018A (en) * | 1993-08-04 | 1995-02-10 | Kawasaki Steel Corp | Method for preventing clogging of spray nozzle for secondary cooling in continuous casting |
| JP3373007B2 (en) * | 1993-10-14 | 2003-02-04 | 新日本製鐵株式会社 | Nozzle abnormality detection device |
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