JP2022114696A5

JP2022114696A5 -

Info

Publication number: JP2022114696A5
Application number: JP2021011092A
Authority: JP
Filing date: 2021-01-27
Publication date: 2024-01-29

Description

本開示の第１態様は、固体燃料が載置される粉砕テーブルと、前記粉砕テーブル上に載置された前記固体燃料を押圧して粉砕する粉砕ローラと、前記粉砕ローラを支持し、前記粉砕ローラと一体的に揺動するジャーナルヘッドと、前記ジャーナルヘッドに固定して設けられており、前記粉砕ローラの外表面の摩耗状態を監視する監視部と、を備え、前記監視部は、前記粉砕ローラの外表面に対する距離を計測する複数の測距センサを用いて構成されており、前記測距センサの計測結果に基づいて、前記粉砕ローラの摩耗量を演算する演算部を備える固体燃料粉砕装置である。 A first aspect of the present disclosure includes a crushing table on which a solid fuel is placed, a crushing roller that presses and crushes the solid fuel placed on the crushing table, and a crushing roller that supports the crushing roller and that crushes the solid fuel. a journal head that swings integrally with the roller; and a monitoring section that is fixed to the journal head and monitors the wear state of the outer surface of the grinding roller, and the monitoring section is configured to The solid fuel pulverizer is configured using a plurality of distance sensors that measure the distance to the outer surface of the roller, and includes a calculation unit that calculates the amount of wear of the pulverizer roller based on the measurement results of the distance sensors. It is a device.

本開示の第２態様は、固体燃料が載置される粉砕テーブルと、前記粉砕テーブル上に載置された前記固体燃料を押圧して粉砕する粉砕ローラと、前記粉砕ローラを支持し、前記粉砕ローラと一体的に揺動するジャーナルヘッドとを備える固体燃料粉砕装置のローラ摩耗量監視方法であって、前記粉砕ローラの外表面に対する距離を計測する複数の測距センサを用いて構成されており、前記測距センサの計測結果に基づいて、前記粉砕ローラの摩耗量を演算する演算部を備えるとともに、前記ジャーナルヘッドに固定して設けられた監視部を用いて、前記粉砕ローラの外表面の摩耗状態を監視するローラ摩耗量監視方法である。 A second aspect of the present disclosure provides a crushing table on which a solid fuel is placed, a crushing roller that presses and crushes the solid fuel placed on the crushing table, and a crushing roller that supports the crushing roller and that crushes the solid fuel. A method for monitoring the amount of roller wear of a solid fuel pulverizer including a roller and a journal head that swings integrally with the roller, the method comprising using a plurality of distance sensors that measure distances to the outer surface of the pulverizing roller. , a calculation unit that calculates the wear amount of the grinding roller based on the measurement result of the distance sensor, and a monitoring unit fixedly provided to the journal head to measure the outer surface of the grinding roller. This is a roller wear amount monitoring method for monitoring the wear state.

さらに、監視部１０１では、センサＳのセット（以下、「センサ群」という。）がローラ部６４の周方向においても設けられている。具体的には、ローラ１３の回転軸方向（軸方向）に配置された複数のセンサＳを１組のセンサ群とする。そして、このセンサ群がローラ部６４の周方向において複数配置される。本実施形態では、図６に示すように、５つのセンサＳがセンサ群に含まれることとし、このセンサ群が２列設けられる場合を例として説明する。なお、センサ群に含まれるセンサ数は限定されず、また、列数についても限定されない。列数については１列としてもよい。 Furthermore, in the monitoring section 101, a set of sensors S (hereinafter referred to as "sensor group") is also provided in the circumferential direction of the roller section 64. Specifically, a plurality of sensors S arranged in the rotational axis direction (axial direction) of the roller 13 are set as one sensor group. A plurality of these sensor groups are arranged in the circumferential direction of the roller portion 64. In this embodiment, as shown in FIG. 6, it is assumed that five sensors S are included in a sensor group, and the case where two rows of this sensor group are provided will be described as an example. Note that the number of sensors included in the sensor group is not limited, nor is the number of columns. The number of columns may be one.

位置調整機構１１０の構成については、上記に限定されない。すなわち、ローラ部６４の半径方向に位置調整が可能な構成であれば、ボルト穴等に限定されない。また、手動で位置調整することとしても良いし、１つまたは複数のセンサＳで検知される摩耗量が、測定範囲や所定の値を超えたことを検知して、自動で位置調整することとしてもよい。このとき、位置調整量は該当の監視部１０１に設けられたセンサＳの内、最も摩耗量が小さいセンサＳの摩耗量以下となるように調整され、ローラ１３と監視部１０１の接触を防止する。従って、駆動装置はアナログ的に任意の位置での位置決め及び保持が可能な、油圧シリンダ、電動モータ等により駆動されることが好ましい。 The configuration of the position adjustment mechanism 110 is not limited to the above. That is, as long as the position of the roller portion 64 can be adjusted in the radial direction, it is not limited to bolt holes or the like. Alternatively, the position may be adjusted manually, or the position may be adjusted automatically when the amount of wear detected by one or more sensors S exceeds a measurement range or a predetermined value. Good too. At this time, the position adjustment amount is adjusted to be equal to or less than the amount of wear of the sensor S with the smallest amount of wear among the sensors S provided in the corresponding monitoring section 101, thereby preventing contact between the roller 13 and the monitoring section 101. . Therefore, it is preferable that the drive device be driven by a hydraulic cylinder, an electric motor, etc., which can be positioned and held at any arbitrary position in an analog manner.

予測部５４は、固体燃料粉砕装置１００の運転状態と、運転状態に対応した余寿命推移特性とが予め蓄積されたデータベース、及び現在の運用で蓄積されたデータベースに基づいて、推定部５３において推定した余寿命の推移より将来の余寿命の推移を予測する。余寿命推移特性とは、運転状態によって推移する余寿命の特性を示した情報であり、具体的には図２０のａ、ｂ、ｃに示すような曲線特性（直線でもよい）である。すなわち、データベースには、固体燃料粉砕装置１００の過去及び現在までの運転情報が格納されている。データベースには、寿命推定対象の固体燃料粉砕装置１００の過去運転データを格納することとしてもよいし、構成が類似する他の固体燃料粉砕装置１００の過去運転データを格納することとしてもよい。また、実運転データだけでなく、仮想的にシミュレーションしたデータをデータベースに格納することとしてもよい。データベースは制御装置５０に設けられてもよい（記憶部）し、別装置に設けられることとしてもよい。運転状態は、固体燃料の種類（炭種情報や燃料種類情報など）、固体燃料の供給量（給炭量）、ローラ１３への油圧荷重（ローラ１３の粉砕テーブル１２に対する押圧力）、固体燃料粉砕装置１００の累積運転時間、固体燃料粉砕装置１００の運転負荷の少なくともいずれか１つを含む。なお、運転状態としては、ローラ１３の寿命に影響を与えるパラメータであれば上記に限定されず含むことができる。 The prediction unit 54 performs estimation in the estimation unit 53 based on a database in which the operating state of the solid fuel pulverizer 100 and remaining life transition characteristics corresponding to the operating state are accumulated in advance, and a database accumulated in the current operation. Predict future trends in remaining life based on trends in remaining life. The remaining life transition characteristic is information indicating the characteristic of the remaining life that changes depending on the operating state, and specifically, it is a curved characteristic (a straight line may be used) as shown in a, b, and c of FIG. 20. That is, the database stores past and present operating information of the solid fuel pulverizer 100. The database may store past operating data of the solid fuel pulverizer 100 whose lifetime is to be estimated, or may store past operating data of other solid fuel pulverizers 100 with similar configurations. Furthermore, not only actual operation data but also virtually simulated data may be stored in the database. The database may be provided in the control device 50 (storage unit) or may be provided in a separate device. The operating status includes the type of solid fuel (coal type information, fuel type information, etc.), solid fuel supply amount (coal feed amount), hydraulic load on roller 13 (pressure force of roller 13 against crushing table 12), solid fuel This includes at least one of the cumulative operating time of the pulverizer 100 and the operating load of the solid fuel pulverizer 100. Note that the operating state is not limited to the above and may include any parameter that affects the life of the roller 13.

予測部５４は、選定した余寿命推移特性（ａ、ｂ、ｃ）の中から、余寿命推定対象となっている固体燃料粉砕装置１００のローラ１３（ローラ部６４）に対して実施した余寿命の推定結果の推移特性Ｅに類似するローラ肉厚の推移特性をもつ余寿命推移特性（ａ、ｂ、ｃ）を特定する。図２０の例では、ローラ肉厚の計測情報からのＥ１からＥｎまでの推移特性が、特性ｃに類似しているため、特性ｃが特定される。例えば、類否の判断は、例えば、累積時間に対するローラ肉厚（または摩耗量）の推移特性が所定の範囲内で一致しているか否かで判断してもよい。所定の範囲内で一致しているか否かは、例えば、明らかに突飛と判断される計測情報（ローラ肉厚または摩耗量）を除いて±１０％以内での一致であってもよく、さらに好ましくは±５％以内での一致であってもよい。
特性ｃが特定されると、余寿命推定対象となっている固体燃料粉砕装置１００は、将来的に特性ｃのように余寿命特性が推移し、寿命到達時期Ｔｂに達すると推定される。このように現在計測中のデータを除いた過去のデータベースに基づくことで、将来の余寿命推移を固体燃料粉砕装置１００の運転状態も加味して予測することができるため、より精度よく余寿命を推定することが可能となる。余寿命推定対象となっている固体燃料粉砕装置１００のローラ１３（ローラ部６４）に対して実施した余寿命の推定結果の推移特性Ｅについては、ミル１０の新規設置時から現在までの推移特性としてもよいし、現在から過去所定期間における推移特性としてもよいし、運転状態が大きく変化した（例えば固体燃料の種類が変化した）時点から現在までの推移特性としてもよい。 The prediction unit 54 calculates the remaining life of the roller 13 (roller part 64) of the solid fuel pulverizer 100 whose remaining life is to be estimated from among the selected remaining life transition characteristics (a, b, c). Remaining life transition characteristics (a, b, c) having a roller thickness transition characteristic similar to the transition characteristic E of the estimation result are specified. In the example of FIG. 20, the characteristic c is specified because the transition characteristic from E1 to En based on the measurement information of the roller wall thickness is similar to the characteristic c. For example, the determination of similarity may be made based on, for example, whether or not the transition characteristics of the roller wall thickness (or wear amount) with respect to cumulative time match within a predetermined range. Whether or not they match within a predetermined range may be, for example, a match within ±10%, excluding measurement information that is clearly judged to be unusual (roller wall thickness or wear amount), and more preferably. may be within ±5%.
Once the characteristic c is specified, it is estimated that the remaining life characteristic of the solid fuel pulverizer 100, which is the target of remaining life estimation, will change in the future like the characteristic c, and will reach the end of life time Tb. In this way, based on the past database excluding the data currently being measured, it is possible to predict future trends in remaining life, taking into account the operating status of the solid fuel pulverizer 100, so it is possible to predict the remaining life more accurately. It becomes possible to estimate. Regarding the transition characteristic E of the remaining life estimation results carried out for the roller 13 (roller part 64) of the solid fuel pulverizer 100, which is the target of remaining life estimation, the transition characteristic from the time of new installation of the mill 10 to the present Alternatively, it may be a transition characteristic from the present to a predetermined period in the past, or a transition characteristic from a time when the operating condition has changed significantly (for example, the type of solid fuel has changed) to the present.

計画部５５では、例えば、推定される寿命到達時期に対して、所定期間前にメンテナンス計画を作成する。所定期間とは、例えばメンテナンスを行うローラ１３の手配から交換に要する時間までを所定期間とする等のメンテナンスを安全安定に行うために必要な期間に基づいて所定期間が設定される。メンテナンス計画では、例えば、メンテナンス時期、メンテナンス時期を調整するための運転方案、及び複数台の固体燃料粉砕装置１００における負荷分担調整の少なくとも１つを含んで計画される。 For example, the planning unit 55 creates a maintenance plan a predetermined period before the estimated end of life. The predetermined period is set based on the period necessary for performing maintenance safely and stably, such as setting the predetermined period as the period from arranging the maintenance roller 13 to replacing it. The maintenance plan includes, for example, at least one of maintenance timing, an operation plan for adjusting the maintenance timing, and load sharing adjustment among the plurality of solid fuel pulverizers 100.

本開示に係る固体燃料粉砕装置（１００）によれば、運転状態と余寿命推移特性とが対応づけられたデータベースに基づくことで、推定部（５３）において推定した余寿命の推移より将来の余寿命の推移を予測することができる。将来の余寿命の推移をより正確に予測することができ、より適切なタイミングで粉砕ローラ（１３）のメンテナンス（交換等）を実施することができる。すなわち、より長く粉砕ローラ（１３）を使用することができるため、メンテナンス頻度を低減させることができる。このため、メンテナンスコストを低減することができる。また、固体燃料粉砕装置（１００）の稼働率を向上させることができる。 According to the solid fuel pulverizer (100) according to the present disclosure, based on the database in which operating conditions and remaining life transition characteristics are associated with each other, future surplus is determined based on the remaining life transition estimated by the estimation unit (53). It is possible to predict changes in lifespan. It is possible to predict future trends in remaining life more accurately, and maintenance (replacement, etc.) of the crushing roller (13) can be performed at a more appropriate timing. That is, since the crushing roller (13) can be used for a longer period of time, maintenance frequency can be reduced. Therefore, maintenance costs can be reduced. Moreover, the operating rate of the solid fuel pulverizer (100) can be improved.

Claims

a crushing table on which solid fuel is placed;
a crushing roller that presses and crushes the solid fuel placed on the crushing table;
a journal head that supports the crushing roller and swings integrally with the crushing roller;
a monitoring unit that is fixedly provided to the journal head and monitors the wear state of the outer surface of the crushing roller;
Equipped with
The monitoring unit is configured using a plurality of distance measuring sensors that measure distances to the outer surface of the crushing roller,
A solid fuel crushing device including a calculation unit that calculates an amount of wear of the crushing roller based on a measurement result of the distance measurement sensor .

The solid fuel crushing device according to claim 1, wherein the monitoring unit monitors the wear state of the outer surface of the crushing roller in the circumferential direction based on the rotation speed of the crushing roller.

The solid fuel crushing apparatus according to claim 1 or 2, wherein the monitoring section is provided with a protector for the falling solid fuel.

The solid fuel pulverizer according to any one of claims 1 to 3, wherein the monitoring section has a vertical upper surface inclined with respect to a horizontal direction.

The solid fuel crushing device according to claim 1 , wherein the distance measuring sensor is of an eddy current type or an ultrasonic type.

In the monitoring unit, a plurality of the distance measuring sensors arranged in the rotation axis direction of the grinding roller are set as one sensor group, and a plurality of the sensor groups are arranged in the circumferential direction of the grinding roller, and a plurality of sensor groups are arranged in the circumferential direction of the grinding roller. The solid fuel crushing device according to any one of claims 1 to 5 , wherein the adjacent distance measuring sensors are located at the same position in the direction of the rotation axis.

In the monitoring unit, a plurality of distance measuring sensors arranged in the rotational axis direction of the grinding roller are set as one sensor group, and a plurality of the sensor groups are arranged in the circumferential direction of the grinding roller, and a plurality of sensor groups are arranged in the circumferential direction of the grinding roller. The solid fuel crushing device according to any one of claims 1 to 5 , wherein the adjacent distance measuring sensors are located at different positions in the rotation axis direction.

The solid fuel pulverizer according to any one of claims 1 to 7 , further comprising a cleaning section for cleaning deposits on the pulverizing roller, upstream of the monitoring section in the rotational direction of the pulverizing roller.

The solid fuel crushing device according to any one of claims 1 to 8 , wherein the monitoring section includes an input section that inputs gas between the monitoring section and the outer surface of the crushing roller.

From claim 1, wherein the monitoring unit is arranged within a range of 90° or more and 315° or less with respect to the rotational direction of the grinding roller, with a point where the grinding roller and the grinding table are closest to 0°. 9. The solid fuel pulverizer according to any one of 9 .

The solid fuel crushing device according to any one of claims 1 to 10 , wherein the monitoring unit is provided with a position adjustment mechanism that allows position adjustment in the radial direction of the crushing roller.

2. The solid fuel crushing device according to claim 1 , wherein the monitoring unit is provided with a position adjustment mechanism that allows position adjustment of each of the distance measurement sensors with respect to the radial direction of the crushing roller.

The solid fuel crushing device according to any one of claims 1 to 12 , further comprising an estimation section that estimates the remaining life of the crushing roller based on the amount of wear detected by the monitoring section.

A prediction unit that predicts future trends in remaining life from trends in remaining life estimated by the estimating unit based on a database in which operating conditions and remaining life transition characteristics corresponding to the operating conditions are stored in advance. The solid fuel crushing device according to item 13 .

The solid fuel pulverizer according to claim 14 , wherein the operating state includes at least one of information regarding the type of solid fuel, cumulative operating time, and operating load.

The solid fuel pulverizer according to any one of claims 13 to 15 , further comprising a planning unit that creates a maintenance plan based on the estimated remaining life.

The monitoring unit includes:
an auxiliary distance sensor that measures a distance to a portion of the crushing roller that is not worn out by crushing the solid fuel;
a correction unit that corrects the measurement results of each of the distance measurement sensors based on the measurement results of the auxiliary distance measurement sensors;
The solid fuel crushing device according to any one of claims 1 to 5 .

The solid fuel crushing device according to any one of claims 1 to 16 ,
a boiler that generates steam by burning the solid fuel pulverized by the solid fuel pulverizer;
A power generation plant equipped with

A crushing table on which solid fuel is placed, a crushing roller that presses and crushes the solid fuel placed on the crushing table, and supports the crushing roller and swings integrally with the crushing roller. A method for monitoring roller wear of a solid fuel pulverizer comprising a journal head, the method comprising:
It is configured using a plurality of distance measuring sensors that measure distances to the outer surface of the crushing roller, and includes a calculation unit that calculates the amount of wear of the crushing roller based on the measurement results of the distance measuring sensors, A roller wear amount monitoring method that monitors the wear state of the outer surface of the crushing roller using a monitoring unit fixedly provided to the journal head.