JP3676054B2

JP3676054B2 - Pressure monitoring unit life monitoring device

Info

Publication number: JP3676054B2
Application number: JP29856197A
Authority: JP
Inventors: 巧時吉; 保幸田中; 知充横山; 正昭藤田
Original assignee: Mitsubishi Heavy Industries Ltd
Current assignee: Mitsubishi Heavy Industries Ltd
Priority date: 1997-10-30
Filing date: 1997-10-30
Publication date: 2005-07-27
Anticipated expiration: 2017-10-30
Also published as: JPH11132406A

Description

【０００１】
【発明の属する技術分野】
本発明は、ボイラのスーパーヒータヘッダ、リヒータヘッダ等、管寄せリガメント部を設けるようにした高温厚肉の耐圧部の寿命監視装置に係わり、特に、寿命消費演算に必要な管寄せリガメント部における内周面の温度を、穴開け加工作業が難しい既設の耐圧部の管寄せリガメント部に穴開け加工することなく、検出できるようにした耐圧部の寿命監視装置に関する。
【０００２】
【従来の技術】
従来の寿命監視装置は、ボイラ等の厚肉耐圧部における一般部の内、外周面の温度を計測し、これから熱応力を計算して一般部の寿命監視のみを行うようにしていた。
【０００３】
しかし、最近の欧米での知見によれば、ボイラ厚肉耐圧部の損傷は、一般部ではなく管寄せリガメント部、すなわち、耐圧部に管台を取り付ける部分である管穴貫通周辺部に多発することが知られるようになってきている。
このため、一般部の内、外周面の温度を計測して行うようにした、従来の一般部の寿命監視のみでは信頼性において不安のあるものとなってきた。
このような従来の寿命監視装置の信頼性における不安を解消するため、本出願人は、特願平７−５５６０８号「耐圧部の寿命監視装置」を提案した。
【０００４】
この装置においては、図４に示すように、耐圧部１の寿命消費を演算するための耐圧部１各部の温度を検出する温度センサ２は、特に、寿命消費の監視を必要とする対象である管寄せリガメント部１１の内、外周面および管寄せリガメント部１１の反対側である一般部１２の内、外周面にそれぞれ配設されて、管寄せリガメント部１１の内面温度Ｔ₂、外面温度Ｔ₁、および一般部の内面温度Ｔ₄、外面温度Ｔ₃を検出し、各温度信号を出力するようにしている。
【０００５】
また、配置上の都合等により、内周面又は外周面ではなく内周面近傍又は耐圧部１の中央部にセンサ２′を取り付けるようにした場合には、例えば、２次曲線で温度分布を近似し、内面温度Ｔ₂，Ｔ₄および外面温度Ｔ₁，Ｔ₃を推定して求め、各温度信号を出力するようにする事も可能である。
このような温度センサ２，２′で計測された内面温度Ｔ₂，Ｔ₄および外面温度Ｔ₁，Ｔ₃の各温度信号は、熱応力計算装置３に入力され、数１により管寄せリガメント部１１に、これらの内面温度Ｔ₂，Ｔ₄および外面温度Ｔ₁，Ｔ₃で生じる熱応力σが算出される。
【０００６】
【数１】

【０００７】
また、応力範囲演算装置１３は、熱応力計算装置３で新しく計算された熱応力σと、メモリー４中に温度検出の都度計算されて入力された熱応力とを比較して、最大応力範囲を求め、そのデータを疲労損傷評価装置５へ送る。
疲労損傷評価装置５では、この入力された最大応力範囲のデータから疲労損傷率Ｄ_fを算出する。
【０００８】
一方、内圧応力計算装置７は、耐圧部１の内部に設けた圧力センサ６からの内部圧力の出力信号を受け、この出力信号から内圧応力を算出し、この内圧応力をクリープ損傷評価装置８へ送る。
クリープ損傷評価装置８では、この入力された内圧応力からクリープ損傷率Ｄ_cを算出する。
【０００９】
疲労損傷評価装置５で算出された疲労損傷率Ｄ_f、およびクリープ損傷評価装置８で算出されたクリープ損傷率Ｄ_cは、それぞれ加算器１４へ送られ、加算器１４では疲労損傷率Ｄ_fおよびクリープ損傷率Ｄ_cを加算して、その結果を寿命消費演算装置９へ送る。
寿命消費演算装置９では、この入力された疲労損傷率Ｄ_fとクリープ損傷率Ｄ_cの加算値から、監視対象の管寄せリガメント部１１の寿命消費１０を算出して、耐圧部１において、特に損傷が多発する管寄せリガメント部１１の寿命監視を行うようにしている。
【００１０】
しかしながら、本出願人が提案したこの耐圧部１の寿命監視装置では、従来の一般部の内、外周面の温度を計測して行うようにした耐圧部の寿命監視では、信頼性において不安があり、厚肉耐圧部１で最も損傷を起こすことが知られてきた管寄せリガメント部１１の寿命消費が、実機の挙動に即して定量的に算出されるので、ボイラ等の耐圧部１の管寄せリガメント部１１の損傷程度が常時監視でき、耐圧部１の構造信頼性が向上する利点がある反面、耐圧部１の一般部１２の内、外周面に加えて、温度センサ２を管寄せリガメント部１１の内、外周面、又は温度センサ２′の如く、内、外周面の近傍に取り付けて、温度データを取得するようにしているために、既設ボイラ等に、新たにこのような耐圧部の寿命監視装置を取り付ける場合、特に、管寄せリガメント部１１の内周面に温度センサ２を取付ける場合に、不具合が発生することがある。
【００１１】
すなわち、管寄せリガメント部１１外周面には、本図では図示省略している多数の管台２０を取り付けるようにしているため、温度センサ２，２′設置のための耐圧部１の管寄せリガメント部１１での穴開け加工作業が困難であり、管寄せリガメント部内周面の温度を計測する温度センサ２，２′の設置が難しくなるという不具合があった。
【００１２】
【発明が解決しようとする課題】
本発明は、耐圧部において損傷が多発することが知られてきた、管寄せリガメント部の損傷状況が常時定量的に把握され、耐圧部全体としての構造信頼性を向上させることができる反面、特に、多数の管台が設けられ、穴開け加工作業が難しく、管寄せリガメント部の内周面の温度を検出する温度センサの設置が困難であった、従来の耐圧部の寿命監視装置の不具合を解消するため、温度センサを管台の外周面に取付けて、この温度センサにより、耐圧部の管寄せリガメント部の寿命監視に必要な管寄せリガメント部内周面の温度を検出できるようにした耐圧部の寿命監視装置を提供することを課題とする。
【００１３】
【課題を解決するための手段】
このため、本発明の耐圧部の寿命監視装置は、次の手段とした。
【００１４】
管寄せリガメント部を設けた耐圧部の管寄せリガメント部を含む各部の温度および耐圧部内部の圧力の検出値から耐圧部の寿命消費を算出し、耐圧部の寿命監視を行うようにした耐圧部の寿命監視装置において、管寄せリガメント部の寿命消費の演算に必要な管寄せリガメント部の内周面温度を検出する温度センサを、管寄せリガメント部から外部に向けて突出された管台外周面に設けるものとした。
【００１５】
これにより、管寄せリガメント部の内周面温度を検出する温度センサの設置が、多数の管台が取り付けられている管寄せリガメント部の穴開け加工作業を行うことなくできるようになり、設置がきわめて容易になり、管寄せリガメント部の内周面温度データの取得が容易になるとともに、内周面の正確な温度データが得られるようになる。
【００１６】
特に、管寄せリガメント部を設けた既設ボイラ等への、新たな耐圧部の寿命監視装置が設置が容易になるため、耐圧部で最も損傷を起すことが知られてきた管寄せリガメント部の寿命消費が、実機の挙動に即し定量的に、常時算出できるようになるので、ボイラ等の耐構造にされた耐圧部の信頼性を著しく向上させることができる。
【００１７】
【発明の実施の形態】
以下、本発明の耐圧部の寿命監視装置の実施の一形態を、図面にもとづき説明する。
図１は、本発明の耐圧部の寿命監視装置の実施の第１形態を示す温度センサの取付位置における耐圧部の横断面図、並びにこれらの温度センサからの温度信号および耐圧部内に設けた圧力センサからの圧力信号から耐圧部の寿命消費を算出する装置を示すブロック図、図２は図１に示す矢視Ａ−Ａにおける管寄せリガメント部の部分外周面を示す図である。
なお、図において図４に示す部材と同一部材には同一符号を符して説明は極力省略した。
【００１８】
図において、２０は管寄せリガメント部１１に貫通された穴２７に差し込まれた管台、２１は耐圧部１の一般部１２の外周面に設置された温度センサＡ、２２は一般部１２の管厚の中間部に埋設された温度センサＢ、２３は一般部１２の内周面近傍に埋設された温度センサＣ、２４は管寄せリガメント部１１の外周面で図２に示すように周方向に間隔ｈで配置された管台２０の隣接する管台２０の中央部に設置された温度センサＤ、２５は管寄せリガメント部１１の外周面で図に示すよう軸方向に間隔ｌで配置された管台２０の隣接する管台２０の中央で、温度センサＤ２４と同一の周位置に設けられた温度センサＥ、２６は管台２０の一般部外周面に設けた温度センサＦである。
【００１９】
すなわち、設置が容易にできる温度センサＡ〜Ｅ２１〜２５は、図４に示す従来の耐圧部の寿命監視装置と同様に、耐圧部１の管寄せリガメント部１１の外周面、一般部１２の外周面に設けられる温度センサ２および一般部１２の耐圧部１内に設けられる温度センサ２′と同様にして配設するようにしている。
【００２０】
しかしながら、管寄せリガメント部１１の内周面温度を計測するために管寄せリガメント部１１の内周面に従来設けていた温度センサ２については、管台２０外周面の一般部に設けた温度センサＦ２６で代用して計測するようにした。
これは、温度センサＦ２６の取付けが容易であるばかりでなく、管寄せリガメント部内面は多数の穴２７が空けられており、温度応答が早く、その温度応答が肉厚の薄くされた管台１１の一般部外周面での温度が管寄せリガメント部の内周面の温度と等しくなる温度応答が早く、同等にできるためである。
【００２１】
これらの仮定については、図３に示す非定常温度分布計算結果により妥当である事を確認した。
【００２２】
すなわち、図３に示すように本非定常温度分布計算結果に示すように、温度センサＡ２１、温度センサＢ２２および温度センサＣ２３のそれぞれを模擬する温度出力位置Ｊ２０４１、Ｊ２０３６、およびＪ２０５５のメタル温度は、それぞれ▽、△および菱形で示すように、耐圧部１の温度を上昇させたとき、当然ながら温度差を保って上昇するが、一般部１２の内周面温度を計測する温度センサＣ２３、および管台１０の外周面温度を計測する温度センサＦ２６のそれぞれを模擬する温度出力位置Ｊ２０５５およびＪ８１０のメタル温度である菱形、□は、耐圧部１の温度を上昇させたとき管寄せリガメント部１１内周面の温度出力位置Ｊ５２８のメタル温度○と略一致して上昇しており、管寄せリガメント部１１内周面の温度が、管台２０の一般部外周面に設けた温度センサＦ２６で計測できることが確認された。
【００２３】
このように、管寄せリガメント部１１の内周面の温度計測位置を、管台２０の外周面で代用することにより、既設ボイラに、新たに本実施の形態の耐圧部の寿命監視装置を取り付ける場合等に、外面に多数の管台２０が設置されている管寄せリガメント部１１の狭隘な箇所で、管寄せリガメント部１１の内周面の温度計測を行う温度センサを設置するための穴開け加工を行う必要が無くなり、温度センサの取付が容易になり、本出願人が提案した従来の耐圧部の寿命監視装置の不具合が解消でき、厚肉耐圧部１で最も損傷を起こすことが知られてきた、管寄せリガメント部１１の寿命消費が実機の挙動に即して定量的に算出され、ボイラ等の耐圧部１の管寄せリガメント部１１の損傷程度が常時監視でき、耐圧部１の構造信頼性が向上する利点を既設ボイラ等においても享有できるようになる。
【００２４】
【発明の効果】
以上説明したように、本発明の耐圧部の寿命監視装置によれば、寿命消費の演算に必要な耐圧部の管寄せリガメント部の内周面温度を、管寄せリガメント部から外部に突出させて設けた管台の外周面に設置した温度センサで検知するようにした。
【００２５】
これにより、耐圧部の寿命監視に必須となる管寄せリガメント部の内周面の温度を検出するための温度センサの設置が、多数の管台を取り付け、狭隘な管寄せリガメント部の穴開け加工作業を行うことなくできるようになり、耐圧部の寿命監視設置がきわめて容易になり、管寄せリガメント部の内周面の温度が容易にできるとともに、正確な温度データが得られ、精度の高い寿命消費が算出でき、精度の高い耐圧部の寿命監視ができ、ボイラ等の耐圧部の構造信頼性が向上する。
【００２６】
また、狭隘な管寄せリガメント部の穴開け加工作業を必要とする管寄せリガメント部の内周面の温度を検出する内周面に設置する温度センサの設置が不要になるため、耐圧部の寿命監視装置の既設ボイラ等への適用が容易になり、既設ボイラ等の寿命監視ができ、不慮の事故の発生等を確実に防止できる。
【図面の簡単な説明】
【図１】本発明の耐圧部の寿命監視装置の第１形態を示す温度センサ取付位置の耐圧部の横断面図、並びにこれらの温度センサからの温度信号および耐圧部内に設けた圧力センサからの圧力信号から耐圧部の寿命消費を算出する装置を示すブロック図、
【図２】図１に示す矢視Ａ−Ａにおける管寄せリガメント部外周面の一部を示す図、
【図３】耐圧部の各部に設置される温度センサ設置部のメタル温度の非定常温度分布計算結果を示す図、
【図４】本出願人が先に提案した耐圧部の寿命監視装置を示す耐圧部の横断面図、並びに耐圧部の寿命消費を算出するための装置を示すブロック図である。
【符号の説明】
１耐圧部
２温度センサ
２′ 温度センサ
３熱応力計算装置
４メモリー
５疲労損傷評価装置
６圧力センサ
７内圧応力計算装置
８クリープ損傷評価装置
９寿命消費演算装置
１０寿命消費
１１管寄せリガメント部
１２一般部
１３応力範囲演算装置
１４加算器
２０管台
２１温度センサＡ
２２温度センサＢ
２３温度センサＣ
２４温度センサＤ
２５温度センサＥ
２６温度センサＦ
２７穴
Ｔ₁ 管寄せリガメント部外面温度
Ｔ₂ 管寄せリガメント部内面温度
Ｔ₃ 一般部外面温度
Ｔ₄ 一般部内面温度
σ 管寄せリガメント部の熱応力
Ｄ_c クリープ損傷率
Ｄ_f 疲労損傷率[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a life monitoring device for a high-temperature thick-wall pressure-resistant portion such as a boiler super heater header, reheater header, etc. provided with a header ligament portion, and in particular, an inner circumference in a header ligament portion required for life consumption calculation. The present invention relates to a life monitoring device for a pressure-resistant section that can detect the temperature of a surface without drilling in a ligament part of an existing pressure-resistant section that is difficult to drill.
[0002]
[Prior art]
Conventional life monitoring devices measure the temperature of the outer peripheral surface of a general part in a thick pressure-resistant part such as a boiler, calculate thermal stress from this, and perform only life monitoring of the general part.
[0003]
However, according to recent knowledge in Europe and the United States, damage to the boiler thick wall pressure-resistant part occurs frequently in the peripheral part of the header ligament, that is, the part where the nozzle is attached to the pressure-resistant part, not the general part. It is becoming known.
For this reason, only the conventional life monitoring of the general part, which is performed by measuring the temperature of the outer peripheral surface of the general part, has become uneasy in terms of reliability.
In order to eliminate such anxiety about the reliability of the conventional lifetime monitoring device, the present applicant has proposed Japanese Patent Application No. 7-55608 “Lifetime monitoring device for pressure-resistant portion”.
[0004]
In this apparatus, as shown in FIG. 4, the temperature sensor 2 that detects the temperature of each part of the pressure-resistant unit 1 for calculating the lifetime consumption of the pressure-resistant unit 1 is a target that particularly requires monitoring of the lifetime consumption. The inner surface temperature T ₂ and the outer surface temperature T of the header ligament part 11 are respectively arranged on the outer peripheral surface of the header ligament part 11 and on the outer peripheral surface of the general part 12 opposite to the header ligament part 11. ₁ , and the internal surface temperature T ₄ and the external surface temperature T ₃ of the general part are detected, and each temperature signal is output.
[0005]
For example, when the sensor 2 'is attached not to the inner peripheral surface or the outer peripheral surface but in the vicinity of the inner peripheral surface or the central portion of the pressure-resistant portion 1 for the convenience of arrangement, for example, the temperature distribution is expressed by a quadratic curve. It is also possible to approximate and determine the inner surface temperatures T ₂ and T ₄ and the outer surface temperatures T ₁ and T ₃ and output each temperature signal.
The temperature signals of the inner surface temperatures T ₂ and T ₄ and the outer surface temperatures T ₁ and T ₃ measured by the

temperature sensors

2 and 2 ′ are input to the thermal stress calculation device 3, and the header ligament part is expressed by Equation (1). 11, the thermal stress σ generated at the inner surface temperatures T ₂ and T ₄ and the outer surface temperatures T ₁ and T ₃ is calculated.
[0006]
[Expression 1]

[0007]
Further, the stress range calculation device 13 compares the thermal stress σ newly calculated by the thermal stress calculation device 3 with the thermal stress calculated and inputted every time the temperature is detected in the memory 4 to determine the maximum stress range. The data is obtained and sent to the fatigue damage evaluation apparatus 5.
The fatigue damage evaluation apparatus 5 calculates the fatigue damage rate D _f from the input data of the maximum stress range.
[0008]
On the other hand, the internal pressure stress calculation device 7 receives an output signal of the internal pressure from the pressure sensor 6 provided inside the pressure-resistant portion 1, calculates the internal pressure stress from this output signal, and sends this internal pressure stress to the creep damage evaluation device 8. send.
The creep damage evaluation apparatus 8 calculates a creep damage rate D _c from the input internal pressure stress.
[0009]
Calculated fatigue damage evaluation device 5 fatigue damage rate D _f, and creep damage rate D _c calculated creep damage evaluation device 8 is sent to the adders 14, the fatigue damage rate D _f and the adder 14 The creep damage rate D _c is added, and the result is sent to the life consumption calculating device 9.
In lifetime consumption computing unit 9, the sum of the input fatigue damage rate D _f and the creep damage rate D _c, to calculate the life consumption 10 monitored the tube pulling the ligament portions 11, the withstand voltage portion 1, in particular The life of the header ligament part 11 that is frequently damaged is monitored.
[0010]
However, in the lifetime monitoring device of the pressure-resistant portion 1 proposed by the present applicant, there is anxiety in reliability in the lifetime monitoring of the pressure-resistant portion that is performed by measuring the temperature of the outer peripheral surface of the conventional general portion. Since the lifetime consumption of the header ligament part 11 that has been known to cause the most damage in the thick wall pressure resistant part 1 is quantitatively calculated according to the behavior of the actual machine, the pipe of the pressure resistant part 1 such as a boiler While the degree of damage of the shift ligament part 11 can be monitored at all times and there is an advantage that the structural reliability of the pressure resistant part 1 is improved, the temperature sensor 2 is connected to the outer peripheral surface of the general part 12 of the pressure resistant part 1 in addition to the pipe ligament. Since the temperature data is acquired by attaching to the inner and outer peripheral surfaces of the portion 11 and in the vicinity of the inner and outer peripheral surfaces like the temperature sensor 2 ', such a pressure-resistant portion is newly added to the existing boiler or the like. When installing a lifetime monitoring device In the inner peripheral surface of the pipe pulling the ligament portions 11 when mounting the temperature sensor 2, a malfunction may occur.
[0011]
That is, since a large number of nozzles 20 (not shown in the drawing) are attached to the outer peripheral surface of the header ligament 11, the header ligament of the pressure-resistant portion 1 for installing the

temperature sensors

2, 2 ′. There is a problem in that it is difficult to perform drilling work at the portion 11 and it is difficult to install the

temperature sensors

2 and 2 ′ for measuring the temperature of the inner peripheral surface of the header ligament portion.
[0012]
[Problems to be solved by the invention]
While the present invention has been known to cause frequent damage in the pressure-resistant part, the damage status of the header ligament part can always be quantitatively grasped, and the structural reliability of the entire pressure-resistant part can be improved, in particular This is a problem with the conventional pressure monitoring unit life monitoring device, which is equipped with a large number of nozzles, making drilling work difficult, and installing a temperature sensor that detects the temperature of the inner peripheral surface of the header ligament. In order to solve this problem, a temperature sensor is attached to the outer peripheral surface of the nozzle, and this temperature sensor can detect the temperature of the inner peripheral surface of the header ligament part necessary for monitoring the life of the header ligament part of the pressure resistant part. It is an object of the present invention to provide a lifetime monitoring apparatus.
[0013]
[Means for Solving the Problems]
For this reason, the lifetime monitoring apparatus of the pressure | voltage resistant part of this invention was used as the following means.
[0014]
Pressure-resistant part that calculates the lifetime consumption of the pressure-resistant part from the detected values of the temperature of each part including the header ligament part and the pressure inside the pressure-resistant part, and monitors the life of the pressure-resistant part. In the life monitoring device, the outer peripheral surface of the nozzle that protrudes outward from the header ligament part is a temperature sensor that detects the inner peripheral surface temperature of the header ligament part necessary for calculating the life consumption of the header ligament part. It was supposed to be provided.
[0015]
This makes it possible to install a temperature sensor that detects the inner peripheral surface temperature of the header ligament part without performing drilling work on the header ligament part to which many nozzles are attached. It becomes extremely easy, and it becomes easy to obtain the inner peripheral surface temperature data of the header ligament part, and accurate temperature data of the inner peripheral surface can be obtained.
[0016]
In particular, it is easy to install a new pressure monitoring unit life monitoring device on existing boilers equipped with a header ligament part, so the life of the header ligament part that has been known to cause the most damage in the pressure resistant part Since the consumption can be always calculated quantitatively in accordance with the behavior of the actual machine, the reliability of the pressure-resistant portion having a resistance structure such as a boiler can be remarkably improved.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a pressure monitoring unit life monitoring apparatus according to the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a pressure-resistant portion at a temperature sensor mounting position showing a first embodiment of a pressure-resistant portion life monitoring apparatus according to the present invention, temperature signals from these temperature sensors, and pressure provided in the pressure-resistant portion. FIG. 2 is a diagram showing a partial outer peripheral surface of the header ligament part taken along the line AA shown in FIG. 1. FIG. 2 is a block diagram showing an apparatus for calculating the lifetime consumption of the pressure-resistant part from the pressure signal from the sensor.
In the figure, the same members as those shown in FIG. 4 are denoted by the same reference numerals, and description thereof is omitted as much as possible.
[0018]
In the figure, 20 is a nozzle inserted into a hole 27 penetrating through the header ligament part 11, 21 is a temperature sensor A installed on the outer peripheral surface of the general part 12 of the pressure-

resistant part

1, and 22 is a pipe of the general part 12. Temperature sensors B and 23 embedded in the middle portion of the thickness are temperature sensors C and 24 embedded in the vicinity of the inner peripheral surface of the general portion 12, and 24 is an outer peripheral surface of the header ligament portion 11 in the circumferential direction as shown in FIG. The temperature sensors D and 25 installed at the center of the nozzle 20 adjacent to the nozzle 20 arranged at the interval h are arranged at the interval l in the axial direction on the outer peripheral surface of the header ligament part 11 as shown in the figure. Temperature sensors E and 26 provided at the same peripheral position as the temperature sensor D24 in the center of the nozzle 20 adjacent to the nozzle 20 are temperature sensors F provided on the outer peripheral surface of the general part of the nozzle 20.
[0019]
That is, the temperature sensors A to E 21 to 25 that can be easily installed are provided on the outer peripheral surface of the header ligament part 11 of the pressure-resistant part 1 and the general part 12 in the same manner as the conventional pressure-monitoring part life monitoring device shown in FIG. The temperature sensor 2 provided on the outer peripheral surface and the temperature sensor 2 ′ provided in the pressure-resistant part 1 of the general part 12 are arranged in the same manner.
[0020]
However, with respect to the temperature sensor 2 conventionally provided on the inner peripheral surface of the header ligament part 11 in order to measure the inner peripheral surface temperature of the header ligament part 11, the temperature sensor provided on the general part of the outer peripheral face of the nozzle 20 Instead of F26, measurement was made.
This is not only easy to attach the temperature sensor F26, but also has a large number of holes 27 in the inner surface of the header ligament part, and the temperature response is fast, and the temperature response is made thin. This is because the temperature response at which the temperature at the outer peripheral surface of the general portion becomes equal to the temperature of the inner peripheral surface of the pipe ligament portion is fast and can be made equal.
[0021]
These assumptions were confirmed to be valid from the unsteady temperature distribution calculation results shown in FIG.
[0022]
That is, as shown in this unsteady temperature distribution calculation result as shown in FIG. 3, the metal temperatures of the temperature output positions J2041, J2036, and J2055 that respectively simulate the temperature sensor A21, the temperature sensor B22, and the temperature sensor C23 are As indicated by ▽, △, and rhombus, respectively, when the temperature of the pressure-resistant portion 1 is increased, the temperature sensor C23 that measures the inner peripheral surface temperature of the general portion 12 and the tube naturally rises while maintaining a temperature difference. Diamonds □, which are the metal temperatures of the temperature output positions J2055 and J810 simulating each of the temperature sensors F26 that measure the temperature of the outer peripheral surface of the table 10, are the inner periphery of the ligament part 11 when the pressure-resistant part 1 is raised. The temperature of the surface temperature output position J528 is substantially coincident with the metal temperature ○, and the temperature of the inner peripheral surface of the header ligament portion 11 is increased to the nozzle 2 It was confirmed that the measurement by the general part temperature sensor F26 provided on the outer peripheral surface.
[0023]
In this way, by replacing the temperature measurement position of the inner peripheral surface of the header ligament unit 11 with the outer peripheral surface of the nozzle 20, the lifetime monitoring device for the pressure resistant unit of the present embodiment is newly attached to the existing boiler. In some cases, a hole for installing a temperature sensor for measuring the temperature of the inner peripheral surface of the header ligament unit 11 at a narrow portion of the header ligament unit 11 where many nozzles 20 are installed on the outer surface. It is known that it is no longer necessary to perform processing, the temperature sensor can be easily mounted, the problems of the conventional pressure resistant part lifetime monitoring device proposed by the applicant can be solved, and the thickest pressure resistant part 1 is most damaged. The lifetime consumption of the header ligament unit 11 has been quantitatively calculated according to the behavior of the actual machine, the damage degree of the header ligament unit 11 of the pressure-resistant unit 1 such as a boiler can be constantly monitored, and the structure of the pressure-proof unit 1 Benefits that improve reliability The it becomes possible enjoyment even in existing boiler.
[0024]
【The invention's effect】
As described above, according to the pressure monitoring unit life monitoring device of the present invention, the inner peripheral surface temperature of the header ligament part of the pressure resistance part necessary for the calculation of the life consumption is projected to the outside from the header ligation part. It was made to detect with the temperature sensor installed in the outer peripheral surface of the provided nozzle.
[0025]
This makes it possible to install a temperature sensor to detect the temperature of the inner peripheral surface of the header ligament part, which is essential for monitoring the life of the pressure-resistant part. This makes it possible to perform the work without any work, and makes it very easy to monitor and install the pressure-resistant part's life. The temperature of the inner peripheral surface of the header ligament part can be easily obtained, and accurate temperature data is obtained, resulting in a highly accurate life. Consumption can be calculated, the life of the pressure-resistant part can be monitored with high accuracy, and the structural reliability of the pressure-resistant part such as a boiler is improved.
[0026]
In addition, it is not necessary to install a temperature sensor on the inner peripheral surface that detects the temperature of the inner peripheral surface of the header ligament that requires drilling of a narrow header ligament. The monitoring device can be easily applied to an existing boiler, etc., and the life of the existing boiler can be monitored, so that an unexpected accident can be reliably prevented.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a pressure-resistant portion at a temperature sensor mounting position showing a first embodiment of a pressure-monitoring portion life monitoring device according to the present invention, as well as a temperature signal from these temperature sensors and a pressure sensor provided in the pressure-resistant portion. Block diagram showing a device for calculating the lifetime consumption of the pressure-resistant portion from the pressure signal,
FIG. 2 is a view showing a part of the outer peripheral surface of the header ligament part in the direction of arrows AA shown in FIG.
FIG. 3 is a diagram showing an unsteady temperature distribution calculation result of a metal temperature of a temperature sensor installation part installed in each part of a pressure-resistant part;
FIG. 4 is a cross-sectional view of a pressure-resistant portion showing a lifetime monitoring device for a pressure-resistant portion previously proposed by the present applicant, and a block diagram showing an apparatus for calculating the lifetime consumption of the pressure-resistant portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pressure | voltage resistant part 2 Temperature sensor 2 'Temperature sensor 3 Thermal stress calculation apparatus 4 Memory 5 Fatigue damage evaluation apparatus 6 Pressure sensor 7 Internal pressure stress calculation apparatus 8 Creep damage evaluation apparatus 9 Life consumption calculating apparatus 10 Life consumption 11 Pipe ligation part 12 General Part 13 Stress range calculation device 14 Adder 20 Tubular base 21 Temperature sensor A
22 Temperature sensor B
23 Temperature sensor C
24 Temperature sensor D
25 Temperature sensor E
26 Temperature sensor F
27 Hole T ₁ Heading ligament part outer surface temperature T ₂ Heading ligament part inner surface temperature T ₃ General part outer surface temperature T ₄ General part inner surface temperature σ Thermal stress of the heading ligament part D _c Creep damage rate D _f Fatigue damage rate

Claims

Lifetime monitoring of the pressure-resistant part, which calculates the life consumption of the pressure-resistant part from the temperature of each part of the pressure-resistant part provided with the header ligament part and the detected value of the pressure inside the pressure-resistant part and monitors the life of the pressure-resistant part. In the apparatus, a temperature sensor for detecting an inner peripheral surface temperature of the header ligament part is provided on an outer peripheral surface of a nozzle base protruding outward from the header ligament part. apparatus.