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JP6773066B2 - Abnormality judgment method and abnormality judgment device of oxygen concentration meter installed in the continuous heating furnace - Google Patents
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JP6773066B2 - Abnormality judgment method and abnormality judgment device of oxygen concentration meter installed in the continuous heating furnace - Google Patents

Abnormality judgment method and abnormality judgment device of oxygen concentration meter installed in the continuous heating furnace Download PDF

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JP6773066B2
JP6773066B2 JP2018047293A JP2018047293A JP6773066B2 JP 6773066 B2 JP6773066 B2 JP 6773066B2 JP 2018047293 A JP2018047293 A JP 2018047293A JP 2018047293 A JP2018047293 A JP 2018047293A JP 6773066 B2 JP6773066 B2 JP 6773066B2
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JP2019158268A (en
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西村 隆
隆 西村
一晃 原
一晃 原
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JFE Steel Corp
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本発明は、連続式加熱炉内に設置された酸素濃度計の異常判定方法及び異常判定装置に関する。 The present invention relates to an abnormality determination method and an abnormality determination device of an oxygen concentration meter installed in a continuous heating furnace.

製鉄所における連続式加熱炉(以下、単に加熱炉という)では、副生ガスを燃焼させて鋼片を加熱している。加熱炉の燃焼制御(燃焼空気量制御)として、燃料ガスの使用量に対して予め規定された空気比を持って燃焼させる空気比制御と、加熱炉内の排ガス中の酸素濃度を一定値にする排ガス酸素濃度制御の二つが存在する。排ガス酸素濃度制御は、加熱炉内の排ガス中の酸素濃度を0.5〜2.0体積%の低い値に設定することで空気比を低く保つための制御である。一般的に排ガス中の酸素濃度は次の式によって表される。 In a continuous heating furnace (hereinafter, simply referred to as a heating furnace) in a steel mill, by-product gas is burned to heat steel pieces. As combustion control (combustion air amount control) of the heating furnace, air ratio control for burning with a predetermined air ratio to the amount of fuel gas used and oxygen concentration in the exhaust gas in the heating furnace are kept constant. There are two types of exhaust gas oxygen concentration control. The exhaust gas oxygen concentration control is a control for keeping the air ratio low by setting the oxygen concentration in the exhaust gas in the heating furnace to a low value of 0.5 to 2.0% by volume. Generally, the oxygen concentration in the exhaust gas is expressed by the following formula.

Figure 0006773066
Figure 0006773066

ここで、Aは理論空気量を表し、ガス量(G)が1.0に対して完全燃焼が必要な空気量を意味している。また、Gは理論排ガス量を表し、ガス量(G)が1.0、燃焼空気量(A)が理論空気量Aであった時に発生する排ガス量を意味している。また、mは空気比であり、m=燃焼空気量A/理論空気量Aで表される。
製鉄所においては、理論空気量と異なるガス種を同じ加熱炉で使用したり、加熱炉内への侵入空気の発生により、一定の空気比としても、排ガス中の酸素濃度が一定となっていない。さらに、加熱炉外に排出される排ガスの持ち出す顕熱(排ガス損失熱)は、加熱炉内の排ガス中の酸素濃度と燃料ガスの使用量で推定できることから、排ガス酸素濃度制御が用いられているのが一般的である。
Here, A 0 represents the theoretical air amount, and means the amount of air that requires complete combustion with respect to the gas amount (G) of 1.0. Further, G 0 represents the theoretical exhaust gas amount, and means the exhaust gas amount generated when the gas amount (G) is 1.0 and the combustion air amount (A) is the theoretical air amount A 0 . Further, m is an air ratio, and is represented by m = combustion air amount A / theoretical air amount A 0 .
At steelworks, the oxygen concentration in the exhaust gas is not constant even if the air ratio is constant due to the use of gas types different from the theoretical amount of air in the same heating furnace or the generation of invading air into the heating furnace. .. Furthermore, the exhaust gas oxygen concentration control is used because the apparent heat (exhaust gas loss heat) brought out by the exhaust gas discharged to the outside of the heating furnace can be estimated from the oxygen concentration in the exhaust gas in the heating furnace and the amount of fuel gas used. Is common.

ここで、従来の排ガス酸素濃度制御を行うものとして、例えば、特許文献1乃至5に示すものが知られている。
特許文献1に示す炎症制御補方法は、外気が侵入し得る燃焼制御方法において、火口に供給される燃料流量が設定値以上のときは一定範囲で空燃比を操作し、燃料流量が設定値未満のときは、空燃比を前記一定範囲に保ちながら燃焼設備の内圧を操作して侵入空気量を調節することにより排ガス中の酸素濃度を制御するものである。
また、特許文献2に示す連続鋼材加熱炉は、蓄熱式切替燃焼バーナを有する燃焼制御毎の誘引排ガスヘッダ管に酸素濃度を検出する酸素濃度検出器と、酸素濃度検出器の検出値に基づいて加熱炉内の空気比を制御する制御手段とを備えたものである。
Here, as a conventional exhaust gas oxygen concentration control, for example, those shown in Patent Documents 1 to 5 are known.
The inflammation control supplementary method shown in Patent Document 1 is a combustion control method in which outside air can invade. When the fuel flow rate supplied to the crater is equal to or higher than the set value, the air-fuel ratio is operated within a certain range, and the fuel flow rate is less than the set value. In this case, the oxygen concentration in the exhaust gas is controlled by adjusting the amount of invading air by manipulating the internal pressure of the combustion equipment while keeping the air-fuel ratio within the certain range.
Further, the continuous steel heating furnace shown in Patent Document 2 is based on an oxygen concentration detector that detects an oxygen concentration in an induced exhaust gas header pipe for each combustion control having a heat storage type switching combustion burner and a detection value of the oxygen concentration detector. It is provided with a control means for controlling the air ratio in the heating furnace.

更に、特許文献3に示す連続式加熱炉の操業方法は、各燃焼帯の内で燃焼排ガス流れの最下流に位置する燃焼帯の入口又はその近傍に局所的な加熱を行う燃焼バーナを配置し、燃焼バーナの近傍の燃焼排ガス中の酸素濃度が目標酸素濃度となるように燃焼バーナに対する空気比を制御するものである。
また、特許文献4に示す加熱炉の加熱炉の燃焼制御方法は、排気中の未燃分燃料濃度と酸素濃度とを測定し、これらの測定値に基づいて、燃料と空気とのバーナへの供給量の比率を調整するものである。
Further, in the operation method of the continuous heating furnace shown in Patent Document 3, a combustion burner for local heating is arranged at or near the inlet of the combustion zone located at the most downstream of the combustion exhaust gas flow in each combustion zone. , The air ratio to the combustion burner is controlled so that the oxygen concentration in the combustion exhaust gas in the vicinity of the combustion burner becomes the target oxygen concentration.
Further, in the combustion control method of the heating furnace of the heating furnace shown in Patent Document 4, the unburned fuel concentration and the oxygen concentration in the exhaust gas are measured, and based on these measured values, the fuel and air are transferred to the burner. It adjusts the ratio of supply.

また、特許文献5に示す直火式連続加熱炉の無酸化加熱方法は、直火式連続加熱炉において鋼材を加熱するに際し、加熱帯及び均熱帯においては空気比1.0以下の還元雰囲気で燃焼を行い、予熱帯においては加熱帯及び均熱帯における燃料流量及び未燃ガス濃度に基づいて予め算出した完全燃焼必要空気量を供給し、加熱炉炉尻の排ガス中の酸素濃度に基づいて予熱帯への供給空気量を加減するものである。 Further, in the non-oxidizing heating method of the direct-fired continuous heating furnace shown in Patent Document 5, when heating the steel material in the direct-fired continuous heating furnace, the air ratio is 1.0 or less in the heating zone and in the solitary tropics. Combustion is performed, and in the pre-tropical zone, a pre-calculated amount of complete combustion required air is supplied based on the fuel flow rate and unburned gas concentration in the heating zone and average tropics, and pre-combustion is performed based on the oxygen concentration in the exhaust gas from the furnace butt. It adjusts the amount of air supplied to the tropics.

特公昭58−43658号公報Special Publication No. 58-43658 特許第4653689号公報Japanese Patent No. 4653689 特開2001−272028号公報Japanese Unexamined Patent Publication No. 2001-272028 特開平9−280551号公報Japanese Unexamined Patent Publication No. 9-280551 特公平5−2725号公報Special Fair No. 5-2725

ここで、これら従来の特許文献1乃至5に示す技術のいずれにあっても、加熱炉内に酸素濃度計を設置し、その酸素濃度計から得られた情報をもとに、排ガス酸素濃度制御を行っている。
しかしながら、これら従来の特許文献1乃至5に示す技術のいずれにあっても、酸素濃度計に異常が発生した場合には、燃焼空気量の制御ができなくなってしまう問題がある。特に、酸素濃度計の応答遅れの場合には、一見すると、それなりの数値が表示されており、操炉担当者が異常が発生していることに気付くことができない。酸素濃度計に応答遅れが発生すると、当該応答遅れにより空気比を変動させても酸素濃度計の反応が遅くなるため、結果的に大きく空気比を変化させることになる。空気比が大きく変動することで目標値よりも低い値の酸素濃度となるまで空気比を変化させた結果、燃焼空気不足となる可能性がある。
Here, in any of these conventional techniques shown in Patent Documents 1 to 5, an oxygen concentration meter is installed in the heating furnace, and the exhaust gas oxygen concentration is controlled based on the information obtained from the oxygen concentration meter. It is carried out.
However, any of these conventional techniques shown in Patent Documents 1 to 5 has a problem that the amount of combustion air cannot be controlled when an abnormality occurs in the oxygen concentration meter. In particular, in the case of a delay in the response of the oxygen concentration meter, at first glance, a reasonable value is displayed, and the person in charge of the furnace operator cannot notice that an abnormality has occurred. When a response delay occurs in the oxygen concentration meter, the reaction of the oxygen concentration meter is delayed even if the air ratio is changed due to the response delay, and as a result, the air ratio is greatly changed. As a result of changing the air ratio until the oxygen concentration becomes lower than the target value due to the large fluctuation of the air ratio, there is a possibility that the combustion air becomes insufficient.

従って、本発明はこの従来の問題点を解決するためになされたものであり、その目的は、加熱炉内に設置された酸素濃度計の応答遅れ時間が長い場合に異常と判定し、空気比を異常にすることなく制御することができる、連続式加熱炉内に設置された酸素濃度計の異常判定方法及び異常判定装置を提供することにある。 Therefore, the present invention has been made to solve this conventional problem, and an object of the present invention is to determine that an abnormality occurs when the response delay time of the oxygen concentration meter installed in the heating furnace is long, and to determine the air ratio. It is an object of the present invention to provide an abnormality determination method and an abnormality determination device of an oxygen concentration meter installed in a continuous heating furnace, which can be controlled without making an abnormality.

上記目的を達成するために、本発明の一態様に係る連続式加熱炉内に設置された酸素濃度計の異常判定方法は、連続式加熱炉内に設置された酸素濃度計の異常判定方法であって、前記酸素濃度計により第1の特定時間から第2の特定時間に至るまで連続的に測定された前記連続式加熱炉内の排ガス中の酸素濃度を取得する酸素濃度取得ステップと、燃料ガス流量計により前記第1の特定時間から前記第2の特定時間に至るまで連続的に測定された前記連続式加熱炉に設けられたバーナへの燃料ガス流量を取得する燃料ガス流量取得ステップと、燃焼空気流量計により前記第1の特定時間から前記第2の特定時間に至るまで連続的に測定された前記バーナへの燃焼空気量を取得する燃焼空気流量取得ステップと、取得した燃焼空気流量と前記連続式加熱炉内で使用される理論空気量とから前記第1の特定時間から前記第2の特定時間に至るまで連続的に変化する空気比を算出する空気比算出ステップと、前記第1の特定時間における排ガス中の酸素濃度を目的変数とし、取得された前記第1の特定時間における前記燃料ガス流量及び算出された前記第1の特定時間における前記空気比を説明変数として重回帰分析を行い、重回帰分析の結果得られる前記第1の特定時間における排ガス中の予測酸素濃度と取得された前記第1の特定時間における排ガス中の酸素濃度との前記第1の特定時間における相関係数Rを算出し、この相関係数Rの算出を前記第1の特定時間における相関係数Rから前記第2の特定時間における相関係数Rまで連続的に行って、連続的に変化する相関係数Rを算出する相関係数算出ステップと、前記酸素濃度計により排ガス中の酸素濃度を測定した前記第1の特定時間から、連続的に変化する前記相関係数Rが最大値に至る時間までの前記酸素濃度計の応答遅れ時間を算出する応答遅れ時間算出ステップと、算出された前記酸素濃度計の応答遅れ時間が、所定の閾値よりも長い場合に、前記酸素濃度計の異常と判定する異常判定ステップとを含むことを要旨とする。 In order to achieve the above object, the abnormality determination method of the oxygen concentration meter installed in the continuous heating furnace according to one aspect of the present invention is the abnormality determination method of the oxygen concentration meter installed in the continuous heating furnace. Therefore, the oxygen concentration acquisition step of acquiring the oxygen concentration in the exhaust gas in the continuous heating furnace continuously measured from the first specific time to the second specific time by the oxygen concentration meter, and the fuel. A fuel gas flow rate acquisition step of acquiring a fuel gas flow rate to a burner provided in the continuous heating furnace continuously measured from the first specific time to the second specific time by a gas flow meter. , A combustion air flow rate acquisition step for acquiring the amount of combustion air to the burner continuously measured from the first specific time to the second specific time by a combustion air flow meter, and the acquired combustion air flow rate. And the air ratio calculation step of calculating the air ratio that continuously changes from the first specific time to the second specific time from the theoretical amount of air used in the continuous heating furnace, and the first. Multiple regression analysis with the oxygen concentration in the exhaust gas at the specific time of 1 as the objective variable, and the acquired fuel gas flow rate at the first specific time and the calculated air ratio at the first specific time as explanatory variables. The phase relationship between the predicted oxygen concentration in the exhaust gas at the first specific time obtained as a result of the multiple regression analysis and the acquired oxygen concentration in the exhaust gas at the first specific time at the first specific time. calculates a number R 2, performs calculation of the correlation coefficient R 2 continuously until the correlation coefficient R 2 in the second specific time from the correlation coefficient R 2 in the first specific time, continuous a correlation coefficient calculation step of calculating a correlation coefficient R 2 which changes from the oxygen concentration of the first specified time of measuring the oxygen concentration in the exhaust gas by meter, the correlation coefficient R 2 for continuously change When the response delay time calculation step for calculating the response delay time of the oxygen concentration meter up to the time when is reached the maximum value and the calculated response delay time of the oxygen concentration meter are longer than a predetermined threshold value, the oxygen The gist is to include an abnormality determination step for determining an abnormality in the densitometer.

また、本発明の別の態様に係る連続式加熱炉内に設置された酸素濃度計の異常判定装置は、連続式加熱炉内に設置された酸素濃度計の異常判定装置であって、前記酸素濃度計により第1の特定時間から第2の特定時間に至るまで連続的に測定された前記連続式加熱炉内の排ガス中の酸素濃度を取得する酸素濃度取得部と、燃料ガス流量計により前記第1の特定時間から前記第2の特定時間に至るまで連続的に測定された前記連続式加熱炉に設けられたバーナへの燃料ガス流量を取得する燃料ガス流量取得部と、燃焼空気流量計により前記第1の特定時間から前記第2の特定時間に至るまで連続的に測定された前記バーナへの燃焼空気量を取得する燃焼空気流量取得部と、取得した燃焼空気流量と前記連続式加熱炉内で使用される理論空気量とから前記第1の特定時間から前記第2の特定時間に至るまで連続的に変化する空気比を算出する空気比算出部と、前記第1の特定時間における排ガス中の酸素濃度を目的変数とし、取得された前記第1の特定時間における前記燃料ガス流量及び算出された前記第1の特定時間における前記空気比を説明変数として重回帰分析を行い、重回帰分析の結果得られる前記第1の特定時間における排ガス中の予測酸素濃度と取得された前記第1の特定時間における排ガス中の酸素濃度との前記第1の特定時間における相関係数Rを算出し、この相関係数Rの算出を前記第1の特定時間における相関係数Rから前記第2の特定時間における相関係数Rまで連続的に行って、連続的に変化する相関係数Rを算出する相関係数算出部と、前記酸素濃度計により排ガス中の酸素濃度を測定した前記第1の特定時間から、連続的に変化する前記相関係数Rが最大値に至る時間までの前記酸素濃度計の応答遅れ時間を算出する応答遅れ時間算出部と、算出された前記酸素濃度計の応答遅れ時間が、所定の閾値よりも長い場合に、前記酸素濃度計の異常と判定する異常判定部とを備えていることを要旨とする。 Further, the abnormality determination device of the oxygen concentration meter installed in the continuous heating furnace according to another aspect of the present invention is an abnormality determination device of the oxygen concentration meter installed in the continuous heating furnace, and the oxygen. The oxygen concentration acquisition unit that acquires the oxygen concentration in the exhaust gas in the continuous heating furnace continuously measured from the first specific time to the second specific time by the densitometer, and the fuel gas flow meter A fuel gas flow rate acquisition unit that acquires a fuel gas flow rate to a burner provided in the continuous heating furnace, which is continuously measured from the first specific time to the second specific time, and a combustion air flow meter. The combustion air flow rate acquisition unit that acquires the amount of combustion air to the burner continuously measured from the first specific time to the second specific time, the acquired combustion air flow rate, and the continuous heating. In the air ratio calculation unit that calculates the air ratio that continuously changes from the theoretical amount of air used in the furnace from the first specific time to the second specific time, and in the first specific time. Multiple regression analysis is performed with the oxygen concentration in the exhaust gas as the objective variable and the acquired fuel gas flow rate at the first specific time and the calculated air ratio at the first specific time as explanatory variables. calculating a correlation coefficient R 2 in the first specific time and oxygen concentration in the exhaust gas in the prediction of oxygen concentration acquired first specific time in the exhaust gas in that said first specific time obtained analysis and by performing calculation of the correlation coefficient R 2 continuously until the correlation coefficient R 2 in the second specific time from the correlation coefficient R 2 in the first specific time, continuously varying phase relationship From the correlation coefficient calculation unit that calculates the number R 2 and the first specific time when the oxygen concentration in the exhaust gas is measured by the oxygen concentration meter, the continuously changing correlation coefficient R 2 reaches the maximum value. When the response delay time calculation unit that calculates the response delay time of the oxygen concentration meter up to the time and the calculated response delay time of the oxygen concentration meter are longer than a predetermined threshold value, an abnormality of the oxygen concentration meter occurs. The gist is that it is equipped with an abnormality determination unit for determination.

本発明に係る、連続式加熱炉内に設置された酸素濃度計の異常判定方法及び異常判定装置によれば、連続式加熱炉内に設置された酸素濃度計の応答遅れ時間が長い場合に異常と判定し、空気比を異常にすることなく制御することができる、連続式加熱炉内に設置された酸素濃度計の異常判定方法及び異常判定装置を提供できる。 According to the abnormality determination method and the abnormality determination device of the oxygen concentration meter installed in the continuous heating furnace according to the present invention, an abnormality occurs when the response delay time of the oxygen concentration meter installed in the continuous heating furnace is long. It is possible to provide an abnormality determination method and an abnormality determination device of an oxygen concentration meter installed in a continuous heating furnace, which can determine that the air ratio is not abnormal and can control the air ratio.

本発明の一実施形態に係る連続式加熱炉内に設置された酸素濃度計の異常判定装置の概略構成図である。It is a schematic block diagram of the abnormality determination apparatus of the oxygen concentration meter installed in the continuous heating furnace which concerns on one Embodiment of this invention. 図1に示す異常判定装置における処理の流れを示すフローチャートである。It is a flowchart which shows the flow of processing in the abnormality determination apparatus shown in FIG. 連続式加熱炉において燃料ガス流量及び酸素濃度の0時間(第1の特定時間T1)から35時間(第2の特定時間T2)に至るまでの変動データの一例を示すグラフである。It is a graph which shows an example of the variation data from 0 hour (first specific time T1) to 35 hours (second specific time T2) of a fuel gas flow rate and oxygen concentration in a continuous heating furnace. 連続式加熱炉において空気比及び酸素濃度の0時間(第1の特定時間T1)から35時間(第2の特定時間T2)に至るまでの変動データの一例を示すグラフである。It is a graph which shows an example of the variation data from 0 hour (first specific time T1) to 35 hours (second specific time T2) of an air ratio and oxygen concentration in a continuous heating furnace. 相関係数算出部で算出された連続的に変化する相関係数Rの一例を示すグラフである。Is a graph showing an example of a correlation coefficient R 2 for continuously varying calculated by the correlation coefficient calculating unit. 応答遅れ時間分を是正した連続的に変化する相関係数Rの一例を示すグラフである。Is a graph showing an example of a correlation coefficient R 2 for continuously changes that correct response delay time period.

以下、本発明の実施の形態を図面を参照して説明する。以下に示す実施形態は、本発明の技術的思想を具体化するための装置や方法を例示するものであって、本発明の技術的思想は、構成部品の材質、形状、構造、配置等を下記の実施形態に特定するものではない。また、図面は模式的なものである。そのため、厚みと平面寸法との関係、比率等は現実のものとは異なることに留意すべきであり、図面相互間においても互いの寸法の関係や比率が異なる部分が含まれている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments shown below exemplify devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention describes the material, shape, structure, arrangement, etc. of the components. It is not specified in the following embodiments. The drawings are schematic. Therefore, it should be noted that the relationship, ratio, etc. between the thickness and the plane dimension are different from the actual ones, and there are parts where the relationship and ratio of the dimensions are different between the drawings.

図1には、本発明の一実施形態に係る連続式加熱炉内に設置された酸素濃度計の異常判定装置の概略構成が示されている。連続式加熱炉(以降、単に加熱炉という)1は、被加熱材Sを所定温度にまで加熱する加熱炉本体2を備えている。加熱炉本体2の被加熱材Sの装入側には装入扉3が設けられ、加熱炉本体2の被加熱材Sの抽出側には抽出扉4が設けられている。被加熱材Sは、装入扉3のある装入側から抽出扉4のある抽出側にスキッド12で搬送する間に所定温度に加熱される。
そして、加熱炉本体2の装入側端部近傍には煙道11が設けられており、排ガスは、煙道11からその煙道11の途中に設けられたレキュペレータ7によって熱交換されつつ煙突9に排出されるようになっている。
FIG. 1 shows a schematic configuration of an abnormality determination device of an oxygen concentration meter installed in a continuous heating furnace according to an embodiment of the present invention. The continuous heating furnace (hereinafter, simply referred to as a heating furnace) 1 includes a heating furnace main body 2 that heats the material S to be heated to a predetermined temperature. A charging door 3 is provided on the charging side of the material S to be heated of the heating furnace main body 2, and an extraction door 4 is provided on the extraction side of the material S to be heated of the heating furnace main body 2. The material S to be heated is heated to a predetermined temperature while being transported by the skid 12 from the charging side having the charging door 3 to the extracting side having the extraction door 4.
A flue 11 is provided near the charging side end of the heating furnace main body 2, and the exhaust gas is heat-exchanged from the flue 11 by a recuperator 7 provided in the middle of the flue 11 while the chimney 9 is provided. It is designed to be discharged to.

そして、加熱炉本体2内の煙道11の近傍には、被加熱材Sを加熱するリジェネバーナ5が設けられるとともに、加熱炉本体2内には、装入側から抽出側に向けて所定ピッチで複数のバーナ6が設けられている。各バーナ6も、被加熱材Sを加熱するのである。
ここで、リジェネバーナ5には、燃料ガス供給源10から燃料ガス流量計52を介して燃料ガスが導入されるとともに、燃焼空気供給源54から燃焼空気流量計53及び蓄熱体51を介して燃焼空気が導入される。そして、リジェネバーナ5では、これら導入された燃料ガス及び燃焼空気によって燃焼し、燃焼された排ガスが蓄熱体51及び排ガス流量計55を介して煙突9に排出されるようになっている。ここで、符号56は、排ガス配管に設けられた吸引ブロワである。
A regenerator 5 for heating the material S to be heated is provided in the vicinity of the flue 11 in the heating furnace main body 2, and a predetermined pitch is provided in the heating furnace main body 2 from the charging side to the extraction side. A plurality of burners 6 are provided. Each burner 6 also heats the material S to be heated.
Here, the fuel gas is introduced into the regenerator 5 from the fuel gas supply source 10 via the fuel gas flow meter 52, and is burned from the combustion air supply source 54 via the combustion air flow meter 53 and the heat storage body 51. Air is introduced. Then, the regenerator 5 is burned by the introduced fuel gas and combustion air, and the burned exhaust gas is discharged to the chimney 9 via the heat storage body 51 and the exhaust gas flow meter 55. Here, reference numeral 56 is a suction blower provided in the exhaust gas pipe.

また、各バーナ6には、燃料ガス供給源10から燃料ガス流量計61を介して燃料ガスが導入されるとともに、煙道11に設置されたレキュペレータ7で熱交換された燃焼空気が燃焼空気流量計62を介して導入される。各バーナ6では、これら導入された燃料ガス及び燃焼空気によって燃焼し、燃焼された排ガスが煙道11から排出されるようになっている。ここで、符号71は、熱風温度計、73は吸引ブロワである。
また、加熱炉本体2の煙道11入口近傍であって加熱炉本体2の天井部には、排ガス中の酸素濃度を測定する酸素濃度計8が設置されている。
Further, fuel gas is introduced into each burner 6 from the fuel gas supply source 10 via the fuel gas flow meter 61, and the combustion air heat-exchanged by the recuperator 7 installed in the flue 11 is the combustion air flow rate. It is introduced via a total of 62. Each burner 6 is burned by the introduced fuel gas and combustion air, and the burned exhaust gas is discharged from the flue 11. Here, reference numeral 71 is a hot air thermometer, and 73 is a suction blower.
Further, an oxygen concentration meter 8 for measuring the oxygen concentration in the exhaust gas is installed near the inlet of the flue 11 of the heating furnace main body 2 and on the ceiling of the heating furnace main body 2.

この酸素濃度計8は、図3に示すように、加熱炉本体2内の排ガス中の酸素濃度を、0時間(第1の特定時間T1)から35時間(第2の特定時間T2)に至るまで連続的に測定する。
また、リジェネバーナ5用の燃料ガス流量計52及び各バーナ6用の燃料ガス流量計61は、それぞれ、図3に示すように、リジェネバーナ5に導入される燃料ガス流量、各バーナ6に導入される燃料ガス流量を、0時間(第1の特定時間T1)から35時間(第2の特定時間T2)に至るまで連続的に測定する。
As shown in FIG. 3, the oxygen concentration meter 8 increases the oxygen concentration in the exhaust gas in the heating furnace main body 2 from 0 hours (first specific time T1) to 35 hours (second specific time T2). Measure continuously up to.
Further, the fuel gas flow meter 52 for the regenerator 5 and the fuel gas flow meter 61 for each burner 6 are introduced into the fuel gas flow rate introduced into the regenerator 5 and each burner 6, respectively, as shown in FIG. The fuel gas flow rate to be measured is continuously measured from 0 hour (first specific time T1) to 35 hours (second specific time T2).

ここで、酸素濃度計8で測定された排ガス中の酸素濃度の変動データと、リジェネバーナ5用の燃料ガス流量計52及び各バーナ6用の燃料ガス流量計61で測定された燃料ガス流量の変動データとの関係を、図3(変動データの一例を示す)から見てみる。酸素濃度計8で測定された排ガス中の酸素濃度の変動データは、燃料ガス流量の変動データに対し、明確に応答時間の遅れを見ることはできないが、若干遅れている。
更に、リジェネバーナ5用の燃焼空気流量計53及び各バーナ6用の燃焼空気流量計62は、それぞれ、リジェネバーナ5に導入される燃焼空気流量、各バーナ6に導入される燃焼空気流量を、0時間(第1の特定時間T1)から35時間(第2の特定時間T2)に至るまで連続的に測定する。
Here, the fluctuation data of the oxygen concentration in the exhaust gas measured by the oxygen concentration meter 8 and the fuel gas flow rate measured by the fuel gas flow meter 52 for the regenerator 5 and the fuel gas flow meter 61 for each burner 6. Let us see the relationship with the fluctuation data from FIG. 3 (an example of the fluctuation data is shown). The fluctuation data of the oxygen concentration in the exhaust gas measured by the oxygen concentration meter 8 does not clearly show a delay in the response time with respect to the fluctuation data of the fuel gas flow rate, but it is slightly delayed.
Further, the combustion air flow meter 53 for the regenerator 5 and the combustion air flow meter 62 for each burner 6 have the combustion air flow rate introduced into the regenerate burner 5 and the combustion air flow rate introduced into each burner 6, respectively. The measurement is continuously performed from 0 hour (first specific time T1) to 35 hours (second specific time T2).

ここで、酸素濃度計8で測定された排ガス中の酸素濃度の変動データと、リジェネバーナ5用の燃焼空気流量計53及び各バーナ6用の燃焼空気流量計62で測定された燃焼空気流量を基に算出した空気比の変動データとの関係を、図4(変動データの一例を示す)から見てみる。酸素濃度計8で測定された排ガス中の酸素濃度の変動データは、リジェネバーナ5用の燃焼空気流量計53及び各バーナ6用の燃焼空気流量計62で測定された燃焼空気流量を基に算出した空気比の変動データに対し、明確に応答時間の遅れを見ることができる。 Here, the fluctuation data of the oxygen concentration in the exhaust gas measured by the oxygen concentration meter 8 and the combustion air flow rate measured by the combustion air flow meter 53 for the regenerator 5 and the combustion air flow meter 62 for each burner 6 are used. Let us see the relationship with the fluctuation data of the air ratio calculated based on FIG. 4 (an example of the fluctuation data is shown). The fluctuation data of the oxygen concentration in the exhaust gas measured by the oxygen concentration meter 8 is calculated based on the combustion air flow rate measured by the combustion air flow meter 53 for the regenerator 5 and the combustion air flow meter 62 for each burner 6. It is possible to clearly see the delay in the response time for the fluctuation data of the air ratio.

従って、本実施形態にあっては、燃料ガス流量及び空気比をパラメータとして用いて、酸素濃度計8の応答遅れ時間を算出し、当該応答遅れ時間が長いときには異常と判定するために、酸素濃度計8の異常判定装置20を備えている。
ここで、異常判定装置20は、図1に示すように、酸素濃度計8、リジェネバーナ5用の燃料ガス流量計52、各バーナ6用の燃料ガス流量計61、リジェネバーナ5用の燃焼空気流量計53、及び各バーナ6用の燃焼空気流量計62に接続されている。
この異常判定装置20は、酸素濃度計8の応答遅れ時間が長いときに異常判定するものであり、酸素濃度取得部21、燃料ガス流量取得部22、燃焼空気流量取得部23、空気比算出部24、相関係数算出部25、応答遅れ時間算出部26及び異常判定部27を備えている。
Therefore, in the present embodiment, the response delay time of the oxygen concentration meter 8 is calculated using the fuel gas flow rate and the air ratio as parameters, and when the response delay time is long, the oxygen concentration is determined to be abnormal. A total of 8 abnormality determination devices 20 are provided.
Here, as shown in FIG. 1, the abnormality determination device 20 includes an oxygen concentration meter 8, a fuel gas flow meter 52 for the regenerate burner 5, a fuel gas flow meter 61 for each burner 6, and combustion air for the regenerator 5. It is connected to the flow meter 53 and the combustion air flow meter 62 for each burner 6.
The abnormality determination device 20 determines an abnormality when the response delay time of the oxygen concentration meter 8 is long, and is an oxygen concentration acquisition unit 21, a fuel gas flow rate acquisition unit 22, a combustion air flow rate acquisition unit 23, and an air ratio calculation unit. 24, a correlation coefficient calculation unit 25, a response delay time calculation unit 26, and an abnormality determination unit 27 are provided.

異常判定装置20は、酸素濃度取得部21、燃料ガス流量取得部22、燃焼空気流量取得部23、空気比算出部24、相関係数算出部25、応答遅れ時間算出部26及び異常判定部27の各機能をコンピュータソフトウェア上でプログラムを実行することで実現するための演算処理機能を有するコンピュータシステムである。そして、このコンピュータシステムは、ROM,RAM,CPU等を備えて構成され、ROM等に予め記憶された各種専用のプログラムを実行することにより、前述した各機能をソフトウェア上で実現する。
ここで、異常判定装置20の酸素濃度取得部21は、酸素濃度計8に接続され、酸素濃度計8により第1の特定時間T1(0時間)から第2の特定時間T2(35時間)に至るまで連続的に測定された加熱炉本体2内の排ガス中の酸素濃度を取得する。
The abnormality determination device 20 includes an oxygen concentration acquisition unit 21, a fuel gas flow rate acquisition unit 22, a combustion air flow rate acquisition unit 23, an air ratio calculation unit 24, a correlation coefficient calculation unit 25, a response delay time calculation unit 26, and an abnormality determination unit 27. It is a computer system having an arithmetic processing function for realizing each of the above functions by executing a program on computer software. Then, this computer system is configured to include a ROM, RAM, CPU, etc., and realizes each of the above-mentioned functions on software by executing various dedicated programs stored in advance in the ROM, etc.
Here, the oxygen concentration acquisition unit 21 of the abnormality determination device 20 is connected to the oxygen concentration meter 8, and the oxygen concentration meter 8 changes from the first specific time T1 (0 hours) to the second specific time T2 (35 hours). The oxygen concentration in the exhaust gas in the heating furnace main body 2 measured continuously up to that point is acquired.

また、燃料ガス流量取得部22は、リジェネバーナ5用の燃料ガス流量計52及び各バーナ6用の燃料ガス流量計61に接続され、燃料ガス流量計52、61により第1の特定時間T1(0時間)から第2の特定時間(35時間)T2に至るまで連続的に測定された燃料ガス流量を取得する。
更に、燃焼空気流量取得部23は、リジェネバーナ5用の燃焼空気流量計53及び各バーナ6用の燃焼空気流量計62により第1の特定時間T1(0時間)から第2の特定時間T2(35時間)に至るまで連続的に測定されたリジェネバーナ5及びバーナ6への燃焼空気量を取得する。
また、空気比算出部24は、燃焼空気流量取得部23から取得した燃焼空気流量と加熱炉本体2内で使用される理論空気量とから第1の特定時間T1(0時間)から第2の特定時間T2(35時間)に至るまで連続的に変化する空気比を算出する。
Further, the fuel gas flow rate acquisition unit 22 is connected to the fuel gas flow meter 52 for the regenerator 5 and the fuel gas flow meter 61 for each burner 6, and the fuel gas flow meters 52 and 61 provide the first specific time T1 ( The fuel gas flow rate measured continuously from 0 hour) to the second specific time (35 hours) T2 is acquired.
Further, the combustion air flow rate acquisition unit 23 uses the combustion air flow meter 53 for the regenerator 5 and the combustion air flow meter 62 for each burner 6 to perform the first specific time T1 (0 hours) to the second specific time T2 ( The amount of combustion air to the regen burner 5 and the burner 6 measured continuously up to (35 hours) is acquired.
Further, the air ratio calculation unit 24 is the first specific time T1 (0 hours) to the second from the combustion air flow rate acquired from the combustion air flow rate acquisition unit 23 and the theoretical air amount used in the heating furnace main body 2. The air ratio that continuously changes until the specific time T2 (35 hours) is calculated.

そして、相関係数算出部25は、第1の特定時間T1(0時間)における排ガス中の酸素濃度を目的変数とし、燃料ガス流量取得部22で取得された第1の特定時間T1(0時間)における燃料ガス流量及び空気比算出部24で算出された第1の特定時間T1(0時間)における空気比を説明変数として次の(1)式により重回帰分析を行う。
y=a+a+b ……(1)
ここで、y:加熱炉本体2における排ガス中の酸素濃度の予測値である予測濃度、x:空気比、x:燃料ガス流量、b:定数項である。
Then, the correlation coefficient calculation unit 25 uses the oxygen concentration in the exhaust gas in the first specific time T1 (0 hours) as the objective variable, and the first specific time T1 (0 hours) acquired by the fuel gas flow rate acquisition unit 22. ), The air ratio at the first specific time T1 (0 hours) calculated by the air ratio calculation unit 24 is used as an explanatory variable, and multiple regression analysis is performed by the following equation (1).
y = a 1 x 1 + a 2 x 2 + b …… (1)
Here, y: predicted concentration which is a predicted value of oxygen concentration in exhaust gas in the heating furnace main body 2, x 1 : air ratio, x 2 : fuel gas flow rate, b: constant term.

また、相関係数算出部25は、重回帰分析の結果得られる第1の特定時間T1(0時間)における排ガス中の予測酸素濃度yと、酸素濃度取得部21で取得された第1の特定時間T1(0時間)における排ガス中の酸素濃度(実測された酸素濃度)との第1の特定時間T1(0時間)における相関係数R(重決定係数ともいう)を算出する。
また、相関係数算出部25は、この相関係数Rの算出を第1の特定時間T1(0時間)における相関係数Rから第2の特定時間T2(35時間)における相関係数Rまで連続的に行って、連続的に変化する相関係数Rを算出する。
Further, the correlation coefficient calculation unit 25 has the predicted oxygen concentration y in the exhaust gas at the first specific time T1 (0 hours) obtained as a result of the multiple regression analysis, and the first identification acquired by the oxygen concentration acquisition unit 21. time and calculates the T1 (also referred to as a coefficient of multiple determination) oxygen concentration (actually measured oxygen concentrations) the correlation coefficient of the first specific time T1 (0 h) and R 2 in the exhaust gas at (0 hours).
Moreover, the correlation coefficient calculation unit 25, a correlation coefficient at the correlation coefficient R to calculate the 2 first specific time T1 from the correlation coefficient R 2 in (0 hours) the second specific time T2 (35 hours) continuously performed until R 2, calculates a correlation coefficient R 2 for continuously varying.

つまり、相関係数算出部25は、(1)式におけるyとxとxの時間を第1の特定時間T1(0時間)から第2の特定時間(35時間)まで少しずつずらしながら重回帰分析を何度も実施し、その都度、相関係数Rを算出して連続的に変化する相関係数Rを算出する。
相関係数算出部25で算出された連続的に変化する相関係数Rの一例を図5に示す。
図5を参照すると、相関係数Rは、酸素濃度計8により排ガス中の酸素濃度を測定した第1の特定時間T1(0時間)から連続的に変化し、この一例では、第1の特定時間T1(0時間)から49分(DT)後に相関係数Rが最大値となっている。
That is, the correlation coefficient calculation unit 25, while shifting little by little until (1) y and x 1 and x 2 of the time the first specific time T1 (0 hours) from the second specific time in the formula (35 hours) Multiple regression analysis was also performed several times, each time to calculate a correlation coefficient R 2 for continuously changed by calculating a correlation coefficient R 2.
An example of a correlation coefficient R 2 for continuously varying calculated by the correlation coefficient calculation unit 25 shown in FIG.
Referring to FIG. 5, the correlation coefficient R 2 is first continuously varied from the specific time T1 (0 h) was measured oxygen concentration in the exhaust gas by the oxygen concentration meter 8, in this example, the first the correlation coefficient R 2 is the maximum value after 49 minutes from a specific time T1 (0 h) (DT).

従って、応答遅れ時間算出部26は、酸素濃度計8により排ガス中の酸素濃度を測定した第1の特定時間T1(0時間)から相関係数Rが最大値に至る時間DT(49分後)までの酸素濃度計8の応答遅れ時間を算出する。
そして、異常判定部27は、応答遅れ時間算出部26で算出された応答遅れ時間が所定の閾値よりも長い場合には、酸素濃度計8の異常と判定する。この閾値は、過去の実績から定められるものであり、例えば、0〜5分程度である。
ここで、図5に示した一例では、応答遅れ時間49分は閾値(0〜5分)よりも長いので、酸素濃度計8は異常と判定される。
Accordingly, the response delay time calculating unit 26, a first specific time T1 (0 hours) Time to a maximum value correlation coefficient R 2 from DT (after 49 minutes of measurement of the oxygen concentration in the exhaust gas by the oxygen concentration meter 8 ), The response delay time of the oxygen concentration meter 8 is calculated.
Then, when the response delay time calculated by the response delay time calculation unit 26 is longer than a predetermined threshold value, the abnormality determination unit 27 determines that the oxygen concentration meter 8 is abnormal. This threshold value is determined from past achievements, and is, for example, about 0 to 5 minutes.
Here, in the example shown in FIG. 5, since the response delay time of 49 minutes is longer than the threshold value (0 to 5 minutes), the oxygen concentration meter 8 is determined to be abnormal.

また、異常判定装置20の異常判定部27には、表示装置30が接続されている。この表示装置30は、プリンタなどの出力装置によって構成され、異常判定部27で酸素濃度計8の異常と判定されたときに、前述の応答遅れ時間を表示する。
なお、図5において、酸素濃度計8により排ガス中の酸素濃度を測定した第1の特定時間T1(0時間)における相関係数Rは、0.0035となっており、ほとんど無相関となっているが、応答遅れ時間49分を加味すると、相関係数Rは0.435(最大値)となり、一定の相関を考えることができる。
Further, a display device 30 is connected to the abnormality determination unit 27 of the abnormality determination device 20. The display device 30 is composed of an output device such as a printer, and displays the above-mentioned response delay time when the abnormality determination unit 27 determines that the oxygen concentration meter 8 is abnormal.
Incidentally, it 5, the correlation coefficient R 2 in the first specific time T1 was measured oxygen concentration in the exhaust gas by the oxygen concentration meter 8 (0 hours) have been a 0.0035, and most uncorrelated However, when the response delay time of 49 minutes is taken into consideration, the correlation coefficient R 2 becomes 0.435 (maximum value), and a certain correlation can be considered.

従って、酸素濃度計8の応答遅れ時間49分を是正すると、連続的に変化する相関係数Rは、図6に示すようになり、是正後は応答遅れ時間がほとんど生じないところで、相関係数Rが最大値をもつことになる。
このため、酸素濃度計8の応答遅れ時間分だけ早くなるように、制御することで、応答遅れ時間がほとんど生じずに、排ガス中酸素濃度制御を行うことが可能となる。
Therefore, when the response delay time of the oxygen concentration meter 8 is corrected to 49 minutes, the continuously changing correlation coefficient R 2 becomes as shown in FIG. 6, and the phase relationship is where the response delay time hardly occurs after the correction. The number R 2 has the maximum value.
Therefore, by controlling the oxygen concentration meter 8 so as to be faster by the response delay time, it is possible to control the oxygen concentration in the exhaust gas with almost no response delay time.

次に、異常判定装置20における処理の流れについて、図2を参照して説明する。
異常判定装置20の酸素濃度取得部21は、酸素濃度取得ステップである以下に示すステップS1を実行する。また、燃料ガス流量取得部22は、燃料ガス流量取得ステップであるステップS2を実行する。また、燃焼空気流量取得部23は燃焼空気流量取得ステップであるステップS3を実行し、空気比算出部24は、空気比算出ステップであるステップS4を実行する。更に、相関係数算出部25は、相関係数算出ステップであるステップS5を実行し、応答遅れ時間算出部26は、応答遅れ算出ステップであるステップS6を実行し、異常判定部27は、異常判定ステップであるステップS7〜S9を実行する。
Next, the flow of processing in the abnormality determination device 20 will be described with reference to FIG.
The oxygen concentration acquisition unit 21 of the abnormality determination device 20 executes the oxygen concentration acquisition step S1 shown below. Further, the fuel gas flow rate acquisition unit 22 executes step S2, which is a fuel gas flow rate acquisition step. Further, the combustion air flow rate acquisition unit 23 executes step S3, which is a combustion air flow rate acquisition step, and the air ratio calculation unit 24 executes step S4, which is an air ratio calculation step. Further, the correlation coefficient calculation unit 25 executes the correlation coefficient calculation step S5, the response delay time calculation unit 26 executes the response delay calculation step S6, and the abnormality determination unit 27 executes the abnormality. Steps S7 to S9, which are determination steps, are executed.

先ず、ステップS1で、酸素濃度取得部21は、酸素濃度計8により第1の特定時間T1(0時間)から第2の特定時間T2(35時間)に至るまで連続的に測定された加熱炉本体2内の排ガス中の酸素濃度を取得する。
次いで、ステップS2で、燃料ガス流量取得部22は、燃料ガス流量計52、61により第1の特定時間T1(0時間)から第2の特定時間(35時間)T2に至るまで連続的に測定された燃料ガス流量を取得する。
更に、ステップS3で、燃焼空気流量取得部23は、リジェネバーナ5用の燃焼空気流量計53及び各バーナ6用の燃焼空気流量計62により第1の特定時間T1(0時間)から第2の特定時間T2(35時間)に至るまで連続的に測定されたリジェネバーナ5及びバーナ6への燃焼空気量を取得する。
First, in step S1, the oxygen concentration acquisition unit 21 continuously measures the oxygen concentration meter 8 from the first specific time T1 (0 hours) to the second specific time T2 (35 hours). Acquires the oxygen concentration in the exhaust gas in the main body 2.
Next, in step S2, the fuel gas flow rate acquisition unit 22 continuously measures the fuel gas flow rate meters 52 and 61 from the first specific time T1 (0 hours) to the second specific time (35 hours) T2. Obtain the fuel gas flow rate.
Further, in step S3, the combustion air flow rate acquisition unit 23 uses the combustion air flow meter 53 for the regenerator 5 and the combustion air flow meter 62 for each burner 6 to perform the first specific time T1 (0 hours) to the second. The amount of combustion air to the regenerate burner 5 and the burner 6 measured continuously up to the specific time T2 (35 hours) is acquired.

そして、ステップS4で、空気比算出部24は、燃焼空気流量取得部23から取得した燃焼空気流量と加熱炉本体2内で使用される理論空気量とから第1の特定時間T1(0時間)から第2の特定時間T2(35時間)に至るまで連続的に変化する空気比を算出する。
次いで、ステップS5で、相関係数算出部25は、第1の特定時間T1(0時間)における排ガス中の酸素濃度を目的変数とし、燃料ガス流量取得部22で取得された第1の特定時間T1(0時間)における燃料ガス流量及び空気比算出部24で算出された第1の特定時間T1(0時間)における空気比を説明変数として前述の(1)式により重回帰分析を行い、重回帰分析の結果得られる第1の特定時間T1(0時間)における排ガス中の予測酸素濃度yと、酸素濃度取得部21で取得された第1の特定時間T1(0時間)における排ガス中の酸素濃度(実測された酸素濃度)との第1の特定時間T1(0時間)における相関係数Rを算出する。
Then, in step S4, the air ratio calculation unit 24 determines the first specific time T1 (0 hours) from the combustion air flow rate acquired from the combustion air flow rate acquisition unit 23 and the theoretical air amount used in the heating furnace main body 2. The air ratio that continuously changes from 1 to the second specific time T2 (35 hours) is calculated.
Next, in step S5, the correlation coefficient calculation unit 25 uses the oxygen concentration in the exhaust gas in the first specific time T1 (0 hours) as the objective variable, and the first specific time acquired by the fuel gas flow rate acquisition unit 22. The fuel gas flow rate at T1 (0 hours) and the air ratio at the first specific time T1 (0 hours) calculated by the air ratio calculation unit 24 are used as explanatory variables, and multiple regression analysis is performed by the above equation (1). The predicted oxygen concentration y in the exhaust gas at the first specific time T1 (0 hours) obtained as a result of the regression analysis, and the oxygen in the exhaust gas at the first specific time T1 (0 hours) acquired by the oxygen concentration acquisition unit 21. calculating a correlation coefficient R 2 in a concentration first specific time T1 (the actually measured oxygen concentrations) (0 hours).

また、ステップS5で、相関係数算出部25は、この相関係数Rの算出を第1の特定時間T1(0時間)における相関係数Rから第2の特定時間T2(35時間)における相関係数Rまで連続的に行って、連続的に変化する相関係数Rを算出する。
次いで、ステップS6で、応答遅れ時間算出部26は、酸素濃度計8により排ガス中の酸素濃度を測定した第1の特定時間T1(0時間)から相関係数Rが最大値に至る時間DTまでの酸素濃度計8の応答遅れ時間を算出する。
そして、ステップS7で、異常判定部27は、応答遅れ時間算出部26で算出された応答遅れ時間が所定の閾値よりも長いか否かを判定し、長い場合(YES)にはステップS8に移行し、同じか短い場合(NO)には処理を終了する。
Further, in step S5, the correlation coefficient calculation unit 25, the second specific time T2 (35 hours) from the correlation coefficient R 2 in the calculation of the correlation coefficient R 2 first specific time T1 (0 hours) The correlation coefficient R 2 that changes continuously is calculated by continuously performing up to the correlation coefficient R 2 in.
Then, in step S6, the response delay time calculating unit 26, an oxygen concentration meter 8 times the first correlation coefficient R 2 from a certain time T1 (0 h) was measured oxygen concentration in the exhaust gas to a maximum value by DT The response delay time of the oxygen concentration meter 8 up to is calculated.
Then, in step S7, the abnormality determination unit 27 determines whether or not the response delay time calculated by the response delay time calculation unit 26 is longer than a predetermined threshold value, and if it is longer (YES), the process proceeds to step S8. If it is the same or shorter (NO), the process ends.

異常判定部27は、ステップS8で異常判定と認定し、ステップS9にて、ステップS6で算出された応答遅れ時間を表示装置30に対し出力し、処理を終了する。
このように、本実施形態に係る連続式加熱炉内に設置された酸素濃度計の異常判定方法及び異常判定装置によれば、第1の特定時間T1における相関係数Rから第2の特定時間T2における相関係数Rまで連続的に変化する相関係数Rを算出し、酸素濃度計8により排ガス中の酸素濃度を測定した第1の特定時間T1から、連続的に変化する相関係数Rが最大値に至る時間までの酸素濃度計8の応答遅れ時間を算出し、算出された酸素濃度計8の応答遅れ時間が、所定の閾値よりも長い場合に、酸素濃度計8の異常と判定する。
The abnormality determination unit 27 determines that the abnormality is determined in step S8, outputs the response delay time calculated in step S6 to the display device 30 in step S9, and ends the process.
Thus, according to the abnormality determination method and the abnormality determination apparatus for an oxygen concentration meter provided on the continuous heating furnace according to the present embodiment, the second identified from the correlation coefficient R 2 in the first specific time T1 calculating a correlation coefficient R 2 for continuously changing until the correlation coefficient R 2 in the time T2, the first specific time T1 was measured oxygen concentration in the exhaust gas by the oxygen concentration meter 8, a continuously varying phase The response delay time of the oxygen concentration meter 8 until the time when the relation number R 2 reaches the maximum value is calculated, and when the calculated response delay time of the oxygen concentration meter 8 is longer than a predetermined threshold value, the oxygen concentration meter 8 Judged as abnormal.

これにより、連続式加熱炉1内に設置された酸素濃度計8の応答遅れ時間が長い場合に異常と判定し、酸素濃度計8に不可避な応答時間遅れが発生した時も、空気比を異常にすることなく排ガス中酸素濃度制御をおこなうことができる。
また、酸素濃度計8の異常と判定されたときに、算出された酸素濃度計8の応答遅れ時間を表示装置30に出力し、表示装置30が応答遅れ時間を表示するので、操炉担当者が表示装置30を見て酸素濃度計8の異常をいち早く検知することができる。
そして、操炉担当者は、酸素濃度計8の応答遅れ時間をいち早く是正することができる。
As a result, if the response delay time of the oxygen concentration meter 8 installed in the continuous heating furnace 1 is long, it is determined to be abnormal, and even if the oxygen concentration meter 8 has an unavoidable response time delay, the air ratio is abnormal. It is possible to control the oxygen concentration in the exhaust gas without using.
Further, when it is determined that the oxygen concentration meter 8 is abnormal, the calculated response delay time of the oxygen concentration meter 8 is output to the display device 30, and the display device 30 displays the response delay time. Can quickly detect an abnormality in the oxygen concentration meter 8 by looking at the display device 30.
Then, the person in charge of operating the furnace can quickly correct the response delay time of the oxygen concentration meter 8.

以上、本発明の実施形態について説明してきたが、本発明はこれに限定されずに種々の変更、改良を行うことができる。
例えば、酸素濃度計8による測定、燃料ガス流量計52、61による測定、及び燃焼空気流量計53、62による測定における第1の特定時間T1は0時間、第2の特定時間T2は35時間としてあるが、これらの時間は任意に設定することができる。
Although the embodiments of the present invention have been described above, the present invention is not limited to this, and various modifications and improvements can be made.
For example, in the measurement by the oxygen concentration meter 8, the measurement by the fuel gas flowmeters 52 and 61, and the measurement by the combustion air flowmeters 53 and 62, the first specific time T1 is 0 hours and the second specific time T2 is 35 hours. However, these times can be set arbitrarily.

1 連続式加熱炉
2 加熱炉本体
3 装入扉
4 抽出扉
5 リジェネバーナ
6 バーナ
7 レキュペレータ
8 酸素濃度計
9 煙突
10 燃料ガス供給源
11 煙道
12 スキッド
20 異常判定装置
21 酸素濃度取得部
22 燃料ガス流量取得部
23 燃焼空気流量取得部
24 空気比算出部
25 相関係数算出部
26 応答遅れ時間算出部
27 異常判定部
30 表示装置
51 蓄熱体
52 燃料ガス流量計
53 燃焼空気流量計
54 燃焼空気供給源
55 排ガス流量計
56 吸引ブロワ
61 燃料ガス流量計
62 燃焼空気流量計
71 熱風温度計
72 吸引ブロワ
S 被加熱材
T1 第1の特定時間
T2 第2の特定時間
1 Continuous heating furnace 2 Heating furnace body 3 Loading door 4 Extraction door 5 Regeneration burner 6 Burner 7 Recuperator 8 Oxygen meter 9 Chimney 10 Fuel gas supply source 11 Smoke path 12 Skid 20 Abnormality judgment device 21 Oxygen concentration acquisition unit 22 Fuel Gas flow rate acquisition unit 23 Combustion air flow rate acquisition unit 24 Air ratio calculation unit 25 Correlation coefficient calculation unit 26 Response delay time calculation unit 27 Abnormality judgment unit 30 Display device 51 Heat storage device 52 Fuel gas flow meter 53 Combustion air flow meter 54 Combustion air Source 55 Exhaust gas flow meter 56 Suction blower 61 Fuel gas flow meter 62 Combustion air flow meter 71 Hot air thermometer 72 Suction blower S Heated material T1 First specific time T2 Second specific time

Claims (4)

連続式加熱炉内に設置された酸素濃度計の異常判定方法であって、
前記酸素濃度計により第1の特定時間から第2の特定時間に至るまで連続的に測定された前記連続式加熱炉内の排ガス中の酸素濃度を取得する酸素濃度取得ステップと、
燃料ガス流量計により前記第1の特定時間から前記第2の特定時間に至るまで連続的に測定された前記連続式加熱炉に設けられたバーナへの燃料ガス流量を取得する燃料ガス流量取得ステップと、
燃焼空気流量計により前記第1の特定時間から前記第2の特定時間に至るまで連続的に測定された前記バーナへの燃焼空気量を取得する燃焼空気流量取得ステップと、
取得した燃焼空気流量と前記連続式加熱炉内で使用される理論空気量とから前記第1の特定時間から前記第2の特定時間に至るまで連続的に変化する空気比を算出する空気比算出ステップと、
前記第1の特定時間における排ガス中の酸素濃度を目的変数とし、取得された前記第1の特定時間における前記燃料ガス流量及び算出された前記第1の特定時間における前記空気比を説明変数として重回帰分析を行い、重回帰分析の結果得られる前記第1の特定時間における排ガス中の予測酸素濃度と取得された前記第1の特定時間における排ガス中の酸素濃度との前記第1の特定時間における相関係数Rを算出し、この相関係数Rの算出を前記第1の特定時間における相関係数Rから前記第2の特定時間における相関係数Rまで連続的に行って、連続的に変化する相関係数Rを算出する相関係数算出ステップと、
前記酸素濃度計により排ガス中の酸素濃度を測定した前記第1の特定時間から、連続的に変化する前記相関係数Rが最大値に至る時間までの前記酸素濃度計の応答遅れ時間を算出する応答遅れ時間算出ステップと、
算出された前記酸素濃度計の応答遅れ時間が、所定の閾値よりも長い場合に、前記酸素濃度計の異常と判定する異常判定ステップとを含むことを特徴とする連続式加熱炉内に設置された酸素濃度計の異常判定方法。
It is an abnormality judgment method of the oxygen concentration meter installed in the continuous heating furnace.
An oxygen concentration acquisition step for acquiring the oxygen concentration in the exhaust gas in the continuous heating furnace continuously measured from the first specific time to the second specific time by the oxygen concentration meter.
A fuel gas flow rate acquisition step for acquiring a fuel gas flow rate to a burner provided in the continuous heating furnace continuously measured from the first specific time to the second specific time by a fuel gas flow meter. When,
A combustion air flow rate acquisition step for acquiring the amount of combustion air to the burner continuously measured from the first specific time to the second specific time by a combustion air flow meter,
Air ratio calculation to calculate the air ratio that continuously changes from the first specific time to the second specific time from the acquired combustion air flow rate and the theoretical air amount used in the continuous heating furnace. Steps and
The oxygen concentration in the exhaust gas at the first specific time is used as the objective variable, and the obtained fuel gas flow rate at the first specific time and the calculated air ratio at the first specific time are used as explanatory variables. A regression analysis is performed, and the predicted oxygen concentration in the exhaust gas at the first specific time obtained as a result of the multiple regression analysis and the acquired oxygen concentration in the exhaust gas at the first specific time are obtained at the first specific time. calculating a correlation coefficient R 2, performs calculation of the correlation coefficient R 2 to the continuously until the correlation coefficient R 2 in the second specific time from the correlation coefficient R 2 in the first specific time, a correlation coefficient calculation step of calculating a correlation coefficient R 2 for continuously changes,
From the oxygen concentration of the first specified time of measuring the oxygen concentration in the exhaust gas by meter, calculating the response delay time of the oxygen concentration meter up to the time that the correlation coefficient R 2 for continuously varying reaches the maximum value Response delay time calculation step and
It is installed in a continuous heating furnace including an abnormality determination step of determining an abnormality of the oxygen concentration meter when the calculated response delay time of the oxygen concentration meter is longer than a predetermined threshold value. How to determine the abnormality of the oxygen concentration meter.
前記異常判定ステップで前記酸素濃度計の異常と判定されたときに、算出された前記酸素濃度計の応答遅れ時間を表示装置に出力し、前記表示装置が前記応答遅れ時間を表示する表示ステップを含むことを特徴とする請求項1に記載の連続式加熱炉内に設置された酸素濃度計の異常判定方法。 When it is determined that the oxygen concentration meter is abnormal in the abnormality determination step, the calculated response delay time of the oxygen concentration meter is output to the display device, and the display device displays the response delay time in the display step. The method for determining an abnormality of an oxygen concentration meter installed in a continuous heating furnace according to claim 1, further comprising. 連続式加熱炉内に設置された酸素濃度計の異常判定装置であって、
前記酸素濃度計により第1の特定時間から第2の特定時間に至るまで連続的に測定された前記連続式加熱炉内の排ガス中の酸素濃度を取得する酸素濃度取得部と、
燃料ガス流量計により前記第1の特定時間から前記第2の特定時間に至るまで連続的に測定された前記連続式加熱炉に設けられたバーナへの燃料ガス流量を取得する燃料ガス流量取得部と、
燃焼空気流量計により前記第1の特定時間から前記第2の特定時間に至るまで連続的に測定された前記バーナへの燃焼空気量を取得する燃焼空気流量取得部と、
取得した燃焼空気流量と前記連続式加熱炉内で使用される理論空気量とから前記第1の特定時間から前記第2の特定時間に至るまで連続的に変化する空気比を算出する空気比算出部と、
前記第1の特定時間における排ガス中の酸素濃度を目的変数とし、取得された前記第1の特定時間における前記燃料ガス流量及び算出された前記第1の特定時間における前記空気比を説明変数として重回帰分析を行い、重回帰分析の結果得られる前記第1の特定時間における排ガス中の予測酸素濃度と取得された前記第1の特定時間における排ガス中の酸素濃度との前記第1の特定時間における相関係数Rを算出し、この相関係数Rの算出を前記第1の特定時間における相関係数Rから前記第2の特定時間における相関係数Rまで連続的に行って、連続的に変化する相関係数Rを算出する相関係数算出部と、
前記酸素濃度計により排ガス中の酸素濃度を測定した前記第1の特定時間から、連続的に変化する前記相関係数Rが最大値に至る時間までの前記酸素濃度計の応答遅れ時間を算出する応答遅れ時間算出部と、
算出された前記酸素濃度計の応答遅れ時間が、所定の閾値よりも長い場合に、前記酸素濃度計の異常と判定する異常判定部とを備えていることを特徴とする連続式加熱炉内に設置された酸素濃度計の異常判定装置。
It is an abnormality judgment device of the oxygen concentration meter installed in the continuous heating furnace.
An oxygen concentration acquisition unit that acquires the oxygen concentration in the exhaust gas in the continuous heating furnace continuously measured from the first specific time to the second specific time by the oxygen concentration meter.
A fuel gas flow rate acquisition unit that acquires a fuel gas flow rate to a burner provided in the continuous heating furnace continuously measured from the first specific time to the second specific time by a fuel gas flow meter. When,
A combustion air flow rate acquisition unit that acquires the amount of combustion air to the burner continuously measured from the first specific time to the second specific time by a combustion air flow meter.
Air ratio calculation to calculate the air ratio that continuously changes from the first specific time to the second specific time from the acquired combustion air flow rate and the theoretical air amount used in the continuous heating furnace. Department and
The oxygen concentration in the exhaust gas at the first specific time is used as the objective variable, and the obtained fuel gas flow rate at the first specific time and the calculated air ratio at the first specific time are used as explanatory variables. A regression analysis is performed, and the predicted oxygen concentration in the exhaust gas at the first specific time obtained as a result of the multiple regression analysis and the acquired oxygen concentration in the exhaust gas at the first specific time are obtained at the first specific time. calculating a correlation coefficient R 2, performs calculation of the correlation coefficient R 2 to the continuously until the correlation coefficient R 2 in the second specific time from the correlation coefficient R 2 in the first specific time, a correlation coefficient calculation unit for calculating a correlation coefficient R 2 for continuously changes,
From the oxygen concentration of the first specified time of measuring the oxygen concentration in the exhaust gas by meter, calculating the response delay time of the oxygen concentration meter up to the time that the correlation coefficient R 2 for continuously varying reaches the maximum value Response delay time calculation unit and
The continuous heating furnace is provided with an abnormality determination unit that determines that the oxygen concentration meter is abnormal when the calculated response delay time of the oxygen concentration meter is longer than a predetermined threshold value. Abnormality judgment device of the installed oxygen concentration meter.
前記異常判定部で前記酸素濃度計の異常と判定されたときに、前記応答遅れ時間を表示する表示装置を備えていることを特徴とする請求項3に記載の連続式加熱炉内に設置された酸素濃度計の異常判定装置。 It is installed in the continuous heating furnace according to claim 3, further comprising a display device for displaying the response delay time when the abnormality determination unit determines that the oxygen concentration meter is abnormal. An abnormality judgment device for the oxygen concentration meter.
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