JPS6316983B2 - - Google Patents
Info
- Publication number
- JPS6316983B2 JPS6316983B2 JP8140480A JP8140480A JPS6316983B2 JP S6316983 B2 JPS6316983 B2 JP S6316983B2 JP 8140480 A JP8140480 A JP 8140480A JP 8140480 A JP8140480 A JP 8140480A JP S6316983 B2 JPS6316983 B2 JP S6316983B2
- Authority
- JP
- Japan
- Prior art keywords
- mill
- coal
- differential pressure
- ratio
- pulverized
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000003245 coal Substances 0.000 claims description 44
- 230000005856 abnormality Effects 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 238000000227 grinding Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000011017 operating method Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Landscapes
- Crushing And Grinding (AREA)
- Disintegrating Or Milling (AREA)
Description
【発明の詳細な説明】
本発明は、石炭焚きボイラへ微粉炭燃料を供給
する微粉炭機（以下、ミルと称する）の運転方式
に係り、特にミル内の石炭粉砕機構の異常を早期
に検出し、ミルを常に安全な状態にするミルの運
転方式に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operation method of a pulverized coal machine (hereinafter referred to as a mill) that supplies pulverized coal fuel to a coal-fired boiler, and in particular, to detect abnormalities in the coal pulverizing mechanism in the mill at an early stage. and related to mill operating methods that keep the mill in a safe condition at all times.
従来のミル運転は、１次空気差圧に対するミル
差圧の比率（ミルレシオと云う）が一定になる様
に、給炭機の回転数及び一次空気量を制御して行
なわれていた。 Conventional mill operation was carried out by controlling the rotational speed of the coal feeder and the amount of primary air so that the ratio of the mill differential pressure to the primary air differential pressure (referred to as the mill ratio) was constant.
第１図にミル運転の構成を示す。図において、
１０はミル、１１は石炭バンカー、１２は給炭
機、１３は給炭機モータ、１４は給炭機回転数検
出器、１５は分離器ダンパ、１６はミル差圧検出
器、１７は１次空気差圧検出器、１８はミル粉砕
用ボール、１９はミルテーブル、２０はミルモー
タ、２１はミル電流検出器、２２は１次空気ダン
パである。 Figure 1 shows the configuration of mill operation. In the figure,
10 is a mill, 11 is a coal bunker, 12 is a coal feeder, 13 is a coal feeder motor, 14 is a coal feeder rotation speed detector, 15 is a separator damper, 16 is a mill differential pressure detector, 17 is a primary An air differential pressure detector, 18 a mill grinding ball, 19 a mill table, 20 a mill motor, 21 a mill current detector, and 22 a primary air damper.
ミル１０は、給炭機１２の給炭機モータ１３の
回転数を、ボイラの負荷指令に応じて変化させる
ことにより、所望量の石炭をミル１０へ供給す
る。ミル１０では、ミルモータ２０によりミルテ
ーブル１９が予定速度で回転されており、ミルボ
ール１８に噛み込んで石炭を粉砕する。 The mill 10 supplies a desired amount of coal to the mill 10 by changing the rotation speed of the coal feeder motor 13 of the coal feeder 12 in accordance with the boiler load command. In the mill 10, a mill table 19 is rotated at a predetermined speed by a mill motor 20, and the mill table 19 bites into the mill balls 18 to crush the coal.
１次空気ダンパ２２によつて調節されたミルへ
の１次空気量によつて、前記のように粉砕された
石炭をミル１０の上部へ運ぶ。ミル上部では、分
離器ダンパ１５により、搬送された石炭の粒度を
分離し、細かい石炭はボイラバーナへ送り、一
方、粗い石炭はミルテーブルへ再び戻す。 The amount of primary air to the mill, regulated by the primary air damper 22, conveys the pulverized coal to the top of the mill 10 as described above. In the upper part of the mill, a separator damper 15 separates the grain size of the conveyed coal, sending the finer coal to the boiler burner, while the coarser coal is returned to the mill table again.
ミル１０の運転においては、ボイラでの石炭の
燃焼状態を一定に維持するために、第１図に示し
た検出器１７，１６によつて、１次空気差圧及び
ミル差圧をそれぞれ検出し、この比がボイラ各負
荷帯にわたり、一定になるように、ミル１０への
石炭給炭量と１次空気量を制御する。 During operation of the mill 10, in order to maintain a constant combustion state of coal in the boiler, the primary air pressure difference and the mill pressure difference are detected by the detectors 17 and 16 shown in FIG. 1, respectively. , the amount of coal fed to the mill 10 and the amount of primary air are controlled so that this ratio remains constant throughout each load zone of the boiler.
つまり、１次空気量に対して石炭が過剰の場合
は、ミル内に石炭が充満して、ミル差圧が異常に
高くなり、石炭をボイラへ搬送できなくなる。反
対に、１次空気量に対して石炭が少ない場合は、
粗い石炭がボイラへ送られるため、未燃分が多く
なつたり、燃料濃度が少ないためボイラで火が消
されたりする恐れがある。以上のことから、ミル
においては、ミル差圧と、１次空気差圧がほぼ一
定になる様な運転がなされている。 That is, if the amount of coal is excessive relative to the amount of primary air, the mill will be filled with coal, and the mill differential pressure will become abnormally high, making it impossible to convey the coal to the boiler. On the other hand, if the amount of coal is small compared to the amount of primary air,
Since coarse coal is sent to the boiler, there is a risk that there will be a large amount of unburned coal, or that the boiler will extinguish the fire due to the low fuel concentration. From the above, the mill is operated in such a way that the mill differential pressure and the primary air differential pressure are approximately constant.
以上の様に運転しているミルにおいて、従来の
ミル運転監視は、第２図に示す様に、ミルレシオ
を常時監視している。 In a mill operating as described above, conventional mill operation monitoring constantly monitors the mill ratio as shown in FIG.
第２図において、４０は除算器、４１はモータ
ーリレー、４２は故障表示器である。それぞれの
検出器１６，１７で測定されたミル差圧および１
次空気差圧は除算器４０に供給され、ミルレシオ
−すなわち両者の比が算出される。ミルレシオは
モニターリレー４１に加えられる。そして、モニ
ターリレー４１は、このミルレシオの値が許容範
囲（上限値または下限値）を越えた時に出力を生
じ、ミル異常として故障表示器４２を駆動した
り、警報を出したりしていた。 In FIG. 2, 40 is a divider, 41 is a motor relay, and 42 is a fault indicator. The mill differential pressure measured by each detector 16, 17 and 1
The sub-air differential pressure is supplied to a divider 40, and the mil ratio, that is, the ratio between the two is calculated. The mil ratio is added to monitor relay 41. The monitor relay 41 generates an output when the value of the mill ratio exceeds the allowable range (upper limit value or lower limit value), and drives the failure indicator 42 or issues an alarm as a mill abnormality.
第３図は、従来のミル運転方式における１次空
気差圧（直線PA）、ミル差圧（直線MD）及びミ
ルレシオ（直線MR）の負荷（横軸）との関係を
示す。また直線UL，LLはそれぞれミルレシオの
上限値および下限値を示している。 Figure 3 shows the relationship between the primary air differential pressure (line PA), mill differential pressure (line MD), and mill ratio (line MR) with the load (horizontal axis) in the conventional mill operation system. In addition, the straight lines UL and LL indicate the upper and lower limits of the mil ratio, respectively.
この様な従来のミル運転方式において、ミル粉
砕異常時等の、ミルレシオ監視によるミル異常警
報は、ミルに異常が発生してから非常に遅れて出
されていたため、ミル損傷等の事故を未然に防止
することができなかつた。 In such conventional mill operation methods, mill abnormality alarms based on mill ratio monitoring, such as when mill grinding abnormalities occur, are issued very late after an abnormality occurs in the mill, making it difficult to prevent accidents such as damage to the mill. could not be prevented.
すなわち、例えば、第４図１に示すように、ミ
ルの負荷上昇時の時刻t0に、ミルのボールが破損
して石炭の粉砕ができなくなつた場合には、石炭
が潰れずミル内に石炭が充満するので、同図２の
点線のように、ミル差圧が次第に増加していく。
この場合、１次空気差圧は、同図３のように、負
荷増加に対する応答が速い。 That is, for example, as shown in Fig. 4, if the balls of the mill break at time t 0 when the load on the mill increases and the coal cannot be pulverized, the coal will not be crushed and will not be crushed inside the mill. As the coal fills, the mill differential pressure gradually increases as shown by the dotted line in FIG.
In this case, the primary air differential pressure has a quick response to an increase in load, as shown in FIG.
したがつて、ミルレシオは、第４図４に示す様
に、一旦は減少し、ミル差圧が異常に高くなつた
後にはじめて応答する。このため、ミルレシオが
その上限ULを超えて警報を発する時期は、ミル
異常が発生してからT1時間後であり、非常に遅
くれる。このため、ミルに異常が発生しても、給
炭機１２は石炭を供給し続けることになり、ミル
の破損が著しくなるなどの問題があつた。 Therefore, as shown in FIG. 4, the mill ratio decreases once and responds only after the mill differential pressure becomes abnormally high. Therefore, the time when the mill ratio exceeds its upper limit UL and a warning is issued is very late, T 1 hour after the occurrence of the mill abnormality. For this reason, even if an abnormality occurs in the mill, the coal feeder 12 continues to supply coal, resulting in problems such as significant damage to the mill.
本発明の目的は、ミル内の粉砕異常を早期に発
見し、ミル損傷破及を未然に防止し、ミルを安全
に運転できるミル運転方式を提供するにある。 An object of the present invention is to provide a mill operation system that can detect grinding abnormalities in a mill at an early stage, prevent damage to the mill, and operate the mill safely.
本発明は、ミル内の異常がミル内の石炭量変化
にいち早く現れ、これに応答してミルモータの負
荷電流が直ぐに変化することに着目してなされた
ものである。 The present invention was developed by focusing on the fact that an abnormality in the mill quickly appears as a result of a change in the amount of coal in the mill, and in response to this, the load current of the mill motor immediately changes.
本発明は、前述の目的を達成するために、ミル
電流とミル差圧の比を監視し、この値を、ミル負
荷に応じて予め設定した上限及び下限値と比較
し、その許容範囲を越えた場合には、ミル異常と
判定して警報を発し、あるいは（及び）給炭機か
らの燃料供給をストツプする様にしたことを特徴
とする。 In order to achieve the aforementioned object, the present invention monitors the ratio of mill current to mill differential pressure, compares this value with preset upper and lower limit values depending on the mill load, and exceeds the permissible range. If this occurs, it is determined that there is an abnormality in the mill and an alarm is issued or (and) fuel supply from the coal feeder is stopped.
本発明の運転方式を用いることにより、ミルの
石炭粉砕異常時には直ぐに異常を検出できるた
め、ミルを安全に運転できる。 By using the operating method of the present invention, when there is an abnormality in coal crushing in the mill, the abnormality can be detected immediately, so the mill can be operated safely.
第５図に、本発明によるミル運転方式の一実施
例を示す。この図から明らかなように、本実施例
においては、まずミル差圧検出器１６及びミル電
流検出器２１の出力値を除算器４０に供給して両
者の比を算出する。そして、前記比の値をモニタ
ーリレー４１にて上限及び下限と比較し、異常の
時には故障表示器４２によつて故障表示や警報を
行ないまたは（及び）給炭機停止指令STを出す
ものである。 FIG. 5 shows an embodiment of the mill operation method according to the present invention. As is clear from this figure, in this embodiment, the output values of the mill differential pressure detector 16 and the mill current detector 21 are first supplied to the divider 40 to calculate the ratio between them. Then, the value of the ratio is compared with the upper and lower limits by a monitor relay 41, and when an abnormality occurs, a failure display or warning is given by a failure indicator 42, or (and) a coal feeder stop command ST is issued. .
第６図に、ミル電流、ミル差圧及びその比の時
性を示している。ミル差圧（直線MD）及びミル
電流（直線MI）は負荷（横軸）に対してはほぼ
比例しており、したがつて、ミル差圧とミル電流
の比（直線Ｒ）は負荷に対してほぼ一定である。
それ故に、前記比の値が大幅に変化している場合
は、ミル異常として検出することができる。 FIG. 6 shows the time characteristics of mill current, mill differential pressure, and their ratio. Mill differential pressure (straight line MD) and mill current (straight line MI) are approximately proportional to load (horizontal axis), therefore, the ratio of mill differential pressure to mill current (straight line R) is proportional to load (horizontal axis). is almost constant.
Therefore, if the value of the ratio changes significantly, it can be detected as a mill abnormality.
本発明によれば、ミル内の粉砕機構に異常が発
生して石炭を粉砕できなくなつた場合は、従来方
式のミルレシオよりも速くミル電流とミル差圧の
比率が大幅に変化するため、早期に異常を検出す
ることができる。 According to the present invention, if an abnormality occurs in the pulverizing mechanism in the mill and coal cannot be pulverized, the ratio of mill current to mill differential pressure changes significantly faster than the conventional mill ratio, so can detect abnormalities.
例えば、第７図１の様に負荷上昇中に、時刻t0
において、ミル粉砕に異常が発生すると、供給さ
れた石炭の分だけミル差圧は徐々に増加するが
（第７図２の点線）、ミル電流はミル内石炭重量の
分だけ直ぐに増加する（第７図３の点線）。この
ために、ミル差圧とミル電流の比は、第７図４の
点線で示したように、直ぐに上限値を越える。 For example, when the load is increasing as shown in FIG. 7, time t 0
When an abnormality occurs in the mill grinding, the mill differential pressure gradually increases by the amount of coal supplied (dotted line in Figure 7), but the mill current immediately increases by the amount of coal in the mill (dotted line in Figure 7). 7 (dotted line in Figure 3). For this reason, the ratio of the mill differential pressure to the mill current immediately exceeds the upper limit value, as shown by the dotted line in FIG.
このために、ミルの異常発生から警報発生まで
の時間T2は、明らかに、第４図の従来方式の時
間T1よりも短かくなる。したがつて、ミル粉砕
異常時におけるミルへの石炭供給を適確に制限で
き、ミル内の損傷破及を防ぐことができる。 For this reason, the time T 2 from the occurrence of an abnormality in the mill to the generation of the alarm is obviously shorter than the time T 1 of the conventional system shown in FIG. Therefore, it is possible to appropriately limit the supply of coal to the mill when the mill is grinding abnormally, and it is possible to prevent damage within the mill.
尚、ミル電流の代りにミル電力を検出しても、
本発明と同じ効果を得ることが出来ることは、容
易に推測できるところである。 Furthermore, even if mill power is detected instead of mill current,
It is easy to infer that the same effects as the present invention can be obtained.
以上の説明から明らかなように、本発明によれ
ば、ミルの過負荷状態の異常はもちろん低負荷状
態の異常をも検出でき、しかも前記のようなミル
異常を早期に検出できるため、ミルを安全に運転
できる効果がある。 As is clear from the above description, according to the present invention, it is possible to detect not only abnormalities in the overload state of the mill but also abnormalities in the low load state, and furthermore, such mill abnormalities as described above can be detected at an early stage. It has the effect of making driving safer.
第１図はミル運転の構成略図、第２図は従来方
式によるミル監視方式のブロツク図、第３図は負
荷に対するミル差圧、１次空気差圧、ミルレシオ
の特性を示す図、第４図は従来方式におけるミル
異常時の動作特性図、第５図は本発明によるミル
監視方式の一実施例のブロツク図、第６図は本発
明における負荷に対するミル差圧、ミル電流及び
その比の特性を示す図、第７図は本発明における
ミル異常時の動作特性の１例を示す図である。
１０……ミル、１２……給炭機、１６……ミル
差圧検出器、１７……１次空気差圧検出器、１８
……ミル粉砕用ボール、１９……ミルテーブル、
２０……ミルモータ、２１……ミル電流検出器、
２１……１次空気ダンパ。
Figure 1 is a schematic diagram of the mill operation configuration, Figure 2 is a block diagram of the conventional mill monitoring system, Figure 3 is a diagram showing the characteristics of mill differential pressure, primary air differential pressure, and mill ratio with respect to load. Figure 4 5 is a block diagram of an embodiment of the mill monitoring method according to the present invention, and FIG. 6 is a characteristic diagram of the mill differential pressure, mill current, and their ratio with respect to the load in the present invention. FIG. 7 is a diagram showing an example of the operating characteristics at the time of abnormality in the mill according to the present invention. 10... Mill, 12... Coal feeder, 16... Mill differential pressure detector, 17... Primary air differential pressure detector, 18
... Mill grinding ball, 19 ... Mill table,
20...Mil motor, 21...Mil current detector,
21...Primary air damper.
Claims (1)
る）へ供給された石炭を、ミル内におけるミルテ
ーブルの回転によつて規定の粉炭粒度になるまで
粉砕し、その粉炭をミルに供給された一次空気に
より搬送してボイラの火炉へ粉炭を送る石炭焚き
ボイラのミル運転方式において、 ミルの入口および出口の差圧と、ミルテーブル
を回転させているミルモータの負荷電流との比を
監視し、 前記の比が予め設定された上限または下限値を
超えた場合は、ミル異常と判定することを特徴と
する石炭焚きボイラのミル運転方式。 ２ 特許請求の範囲第１項の石炭焚きボイラのミ
ル運転方式において、上記の比が予め設定された
上限または下限値を超えた場合は、ミルへの給炭
指令のストツプおよび警報発生の少くとも一方を
実施することを特徴とする石炭焚きボイラのミル
運転方式。[Claims] 1 Coal supplied to a pulverizer (hereinafter referred to as a mill) by a coal feeder is pulverized to a specified pulverized coal particle size by rotating a mill table in the mill, and the pulverized coal is In the mill operation method of a coal-fired boiler, in which pulverized coal is conveyed by the primary air supplied to the mill and sent to the furnace of the boiler, the differential pressure at the inlet and outlet of the mill, the load current of the mill motor that rotates the mill table, and the A mill operation method for a coal-fired boiler, characterized in that: a ratio of: is monitored, and if the ratio exceeds a preset upper or lower limit, a mill abnormality is determined. 2. In the mill operation system for a coal-fired boiler as set forth in claim 1, if the above ratio exceeds a preset upper or lower limit, at least the coal feeding command to the mill is stopped and an alarm is issued. A mill operation method for a coal-fired boiler characterized by implementing one of the methods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8140480A JPS5710348A (en) | 1980-06-18 | 1980-06-18 | System of operating mill of coal burning boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8140480A JPS5710348A (en) | 1980-06-18 | 1980-06-18 | System of operating mill of coal burning boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5710348A JPS5710348A (en) | 1982-01-19 |
| JPS6316983B2 true JPS6316983B2 (en) | 1988-04-12 |
Family
ID=13745375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8140480A Granted JPS5710348A (en) | 1980-06-18 | 1980-06-18 | System of operating mill of coal burning boiler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5710348A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58223450A (en) * | 1982-05-17 | 1983-12-26 | 日鉄鉱業株式会社 | Mill drive control apparatus |
| JPH0534422U (en) * | 1991-10-14 | 1993-05-07 | 日立造船株式会社 | Melting furnace slag outlet |
-
1980
- 1980-06-18 JP JP8140480A patent/JPS5710348A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5710348A (en) | 1982-01-19 |
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