JP3129347B2 - Roller mill operation control method - Google Patents
Roller mill operation control methodInfo
- Publication number
- JP3129347B2 JP3129347B2 JP04155049A JP15504992A JP3129347B2 JP 3129347 B2 JP3129347 B2 JP 3129347B2 JP 04155049 A JP04155049 A JP 04155049A JP 15504992 A JP15504992 A JP 15504992A JP 3129347 B2 JP3129347 B2 JP 3129347B2
- Authority
- JP
- Japan
- Prior art keywords
- coal
- amount
- mill
- roller mill
- line
- 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 - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
Description
【０００１】[0001]
【産業上の利用分野】本発明は微粉炭焚きボイラに供給
される微粉炭を製造する石炭粉砕用ローラミルの制御方
法、特にボイラ負荷変動時の運転制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of controlling a roller mill for coal pulverization for producing pulverized coal supplied to a pulverized coal-fired boiler, and more particularly to an operation control method when a boiler load fluctuates.
【０００２】[0002]
【従来の技術】発電プラントの負荷を例えば３０万ＫＷ
から５０万ＫＷに変化させる場合、その変化量に応じた
微粉炭量をミルからボイラに供給して必要があるが、そ
の場合に従来は図４に示されるように、要求電力量Ｖと
ボイラＢの主蒸気の圧力Ｐおよび温度Ｔから給炭量を演
算し、その演算結果に基づいて、石炭をミルＭへ供給す
る給炭機Ｆへ給炭量指示信号が出され、その指示に従っ
てミルＭが運転されていた。2. Description of the Related Art A load of a power plant is, for example, 300,000 KW.
To 500,000 KW, it is necessary to supply the amount of pulverized coal according to the amount of change from the mill to the boiler. In such a case, as shown in FIG. The amount of coal supplied is calculated from the pressure P and temperature T of the main steam of B, and based on the calculation result, a signal indicating the amount of coal supplied to a coal feeder F that supplies coal to the mill M is output. M was driving.
【０００３】[0003]
【発明が解決しようとする課題】前記従来のローラミル
運転方法においては、ミルＭへ供給される石炭量（以後
単に給炭量と記す）の指示はミルＭからボイラＢへ供給
される粉砕炭量（以後単に排炭量と記す）に基づくもの
ではない。そして給炭量変化指示信号が出されてから実
際に排炭量が変化するまでには粉砕遅れ等の遅れ時間が
あり、図５（ａ）に破線と実線で示すように数１０秒以
上の差が生じる。また排炭量変化特性自体も一定ではな
く、図５（ｂ）に実線Ａ，Ｂで示すように、ミルや石炭
の条件によって異なり、遅れ時間も異なる。In the conventional roller mill operating method, the amount of coal supplied to the mill M (hereinafter simply referred to as coal supply) is indicated by the amount of pulverized coal supplied from the mill M to the boiler B. (Hereinafter simply referred to as coal removal). There is a delay time, such as a pulverization delay, between the output of the coal supply amount change instruction signal and the actual change of the coal removal amount. As shown by the broken line and the solid line in FIG. There is a difference. In addition, the coal discharge amount change characteristics themselves are not constant, and as shown by solid lines A and B in FIG.
【０００４】最近ボイラの急速な負荷変化の要求が強く
なっているが、それに対応して給炭量の変化幅と変化速
度を大きくした場合には、ボイラの目標出力に対して給
炭量が過大あるいは過小になるという問題が生じ、発電
プラント全体を円滑に運転制御する上で大きな支障とな
ってくる。[0004] Recently, the demand for rapid load change of the boiler has become strong. However, if the change width and the change speed of the coal feed rate are correspondingly increased, the coal feed rate becomes smaller than the target output of the boiler. There is a problem that the power generation plant becomes too large or too small, which is a great obstacle to smoothly controlling the operation of the entire power plant.
【０００５】[0005]
【課題を解決するための手段】本発明は、前記従来の課
題を解決するために、回転式分級機を備えた石炭粉砕用
のローラミルにおいて、上記ローラミルに供給される搬
送気体の流量と上記ローラミルから排出される微粉炭の
輸送管の圧損とを計測し、それら計測値に基づいて上記
微粉炭の流量を演算するとともに、上記ローラミルに石
炭を供給する給炭機に与えられる給炭量指示信号を上記
演算の結果に基づいて修正し、かつ上記回転式分級機の
回転数を上記演算結果に基づいて制御することを特徴と
するローラミルの運転制御方法を提案するものである。SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention relates to a roller mill for coal pulverization provided with a rotary classifier, wherein the flow rate of a carrier gas supplied to the roller mill and the flow rate of the roller mill are increased. And the pressure loss of the pulverized coal transport pipe discharged from the furnace, calculate the flow rate of the pulverized coal based on the measured values, and supply a coal feed instruction signal supplied to a coal feeder that supplies coal to the roller mill. Is corrected based on the result of the calculation, and the number of revolutions of the rotary classifier is controlled based on the result of the calculation.
【０００６】[0006]
【作用】実機やテストプラントにおける数多くのテスト
を通じて、微粉炭輸送管の圧損実測値を用いることによ
り実排炭量を常時正確に演算できること、また排炭量は
回転式分級機の回転数増減により増減できることを見出
した。そこで本発明方法においては、上記の実排炭量演
算値と回転式分級機の排炭量調整機能を有効利用するこ
とにより、石炭やミルの条件に関係なく排炭量実際値の
変化遅れ時間を大幅に減少し、給炭量変化指示に対して
追従性の良い排炭量特性を得ることができる。[Action] Through many tests in actual machines and test plants, the actual amount of coal removed can always be calculated accurately by using the measured value of the pressure loss of the pulverized coal transport pipe. The amount of coal removed is determined by increasing or decreasing the rotation speed of the rotary classifier. I found that it can be increased or decreased. Therefore, in the method of the present invention, by effectively utilizing the calculated value of the actual amount of coal removed and the function of adjusting the amount of coal removed of the rotary classifier, the change delay time of the actual amount of coal removed regardless of the conditions of the coal or the mill. Can be greatly reduced, and a coal removal characteristic with good followability to the coal supply change instruction can be obtained.
【０００７】すなわち、実排炭量演算値を回転式分級機
の回転数の指示信号として使用し、実排炭量を常時監視
しながら要求排炭量に対する過不足を極めて短時間で修
正し、要求排炭量特性に殆んど等しい実排炭量を得るこ
とができる。また、実排炭量演算値を給炭量指示系統に
フィードバックすることにより、ボイラ出力変化に応じ
た適切な給炭量指示を給炭機に与えることができ、負荷
急速の変動時に最も警戒すべきことの１つであるボイラ
出力の上り過ぎと下り過ぎを防止できる。That is, by using the calculated actual amount of coal removal as an instruction signal for the number of revolutions of the rotary classifier, while constantly monitoring the actual amount of coal removal, the excess or deficiency with respect to the required amount of coal removal can be corrected in a very short time. It is possible to obtain an actual coal removal amount almost equal to the required coal removal characteristic. In addition, by feeding back the calculated actual coal output to the coal feed indicator system, it is possible to give an appropriate coal feed instruction to the coal feeder according to the change in the boiler output, and to be alert when the load changes rapidly. It is possible to prevent the boiler output from rising and falling too much, which is one of the things to be done.
【０００８】[0008]
【実施例】図１は本発明の一実施例を示す系統図であ
る。ホッパー（１）から給炭機（２）によりミル（４）
へ供給された石炭は、ミル（４）内の粉砕テーブル
（５）に落下してテーブル上炭（７）を形成し、ロール
（６）により荷重が加えられて粉砕炭となる。その粉砕
炭は、ライン（１１）から供給される熱風により乾燥さ
れて回転式分級機（９）の入口に運ばれるが、細い粉砕
炭のみが輸送管（１３）を通ってボイラ（２０）へ供給
される。分級機（９）で阻止された粉砕炭のうち、粗い
ものはテーブル（５）上に落下して再粉砕されるが、比
較的細い粉砕炭はミル（４）内を浮遊して浮遊炭（８）
となる。ボイラ（２０）へ供給された粉砕炭は燃焼さ
れ、その燃焼熱により高温高圧の蒸気が作られて、ライ
ン（２１）により図示省略のタービンへ送られる。FIG. 1 is a system diagram showing an embodiment of the present invention. Mill (4) from hopper (1) with coal feeder (2)
The coal supplied to the mill is dropped on a pulverizing table (5) in the mill (4) to form charcoal (7) on the table, and a load is applied by the roll (6) to become pulverized coal. The pulverized coal is dried by the hot air supplied from the line (11) and carried to the inlet of the rotary classifier (9), but only the fine pulverized coal passes through the transport pipe (13) to the boiler (20). Supplied. Of the pulverized coal blocked by the classifier (9), coarse coal falls onto the table (5) and is re-pulverized, while relatively fine pulverized coal floats in the mill (4) and floats. 8)
Becomes The pulverized coal supplied to the boiler (20) is burned, and high-temperature and high-pressure steam is produced by the combustion heat, and is sent to a turbine (not shown) by a line (21).
【０００９】この系統において、ミル（４）へ供給すべ
き要求給炭量は、演算器（２４）において、石炭発熱
量、ライン（２３）から送られてくる要求電力量、ライ
ン（２２）から送られてくる主蒸気特性（温度，圧
力）、およびライン（１９）から送られてくる実排炭量
（ボイラ（２０）へ送給されている粉砕炭量）演算値に
基づいて演算される。そして給炭量指示信号としてライ
ン（２６）により給炭機（２）に送られ、その信号に基
づいて給炭機モータ（３）の回転数が制御される。こう
して、要求給炭量の石炭がミル（４）へ供給される。In this system, the required amount of coal to be supplied to the mill (4) is calculated from the calorific value of the coal, the required amount of electric power sent from the line (23), and the required amount of coal from the line (22). It is calculated based on the calculated values of the main steam characteristics (temperature and pressure) sent and the actual coal removal (pulverized coal fed to the boiler (20)) sent from the line (19). . Then, the signal is sent to the coal feeder (2) via the line (26) as a coal feed amount instruction signal, and the rotation speed of the coal feeder motor (3) is controlled based on the signal. Thus, the required amount of coal is supplied to the mill (4).
【００１０】ここで実排炭量の演算方法について簡単に
説明する。固気混相流であるミル出口からボイラ入口ま
での微粉炭輸送管の圧損ΔＰは次式で表わされる。Here, a method of calculating the actual coal removal amount will be briefly described. The pressure loss ΔP of the pulverized coal transport pipe from the mill outlet to the boiler inlet, which is a solid-gas multiphase flow, is expressed by the following equation.
【００１１】[0011]
【数１】 (Equation 1)
【００１２】上式においてγa ，Ｌ，Ｄは与条件であ
り、ｕa はＧa とＤとから定まる。またλ，φ，ｋは文
献やテスト結果から容易に求めることができる。そこで
上式は次式に変形することができる。[0012] In the above equation γ a, L, D is given condition, u a is determined from the G a and D. Further, λ, φ, and k can be easily obtained from literatures and test results. Therefore, the above equation can be transformed into the following equation.
【００１３】[0013]
【数２】 (Equation 2)
【００１４】すなわち、空気流量（ミル入口風量）Ｇa
と圧損ΔＰを計測すれば、排炭量Ｇ c をオンラインで求
めることができる。図２は上式［数２］で求めた排炭量
演算値と、排炭を集塵装置で全量連続回収しロードセル
で計測した排炭量実測値（いずれも無次元化してある）
を示したものであるが、両者は良く一致しており、演算
値を実排炭量と見なして良いことが分る。なお、式［数
２］は実際には温度補正が必要であるが、これは一般的
であるので式には示してない。That is, the air flow rate (mill inlet air volume) Ga
And the pressure loss ΔP, the amount of coal removal G cRequest online
Can be Fig. 2 shows the amount of coal removed from the above equation [Equation 2].
Calculated values and coal exhaust are continuously collected and collected by a dust collector and load cell
Actual measured values of coal emissions measured in (all dimensionless)
, But both agree well, and the calculation
It can be seen that the value can be regarded as the actual amount of coal removed. Note that the expression [number
2] actually requires temperature correction, which is generally
Therefore, it is not shown in the equation.
【００１５】排炭量演算に必要な空気流量Ｇa は、ミル
入口熱風ライン（１１）で検出されライン（１２）より
送信される圧力の差として、ライン（１４）により演算
器（１８）へ送られ、温度補正（ラインは図示せず）し
て求められる。微粉炭輸送管（１３）の圧損ΔＰはライ
ン（１５）より送信される圧力の差としてライン（１
６）により、また温度補正用データはライン（１７）に
より、それぞれ演算器（１８）へ送られ、上記式［数
２］により排炭量が求められる。The air flow rate G a necessary Haisumi amount calculation, as the difference in pressure that is transmitted from the line is detected in a mill inlet hot air line (11) (12), the computing unit via line (14) to (18) And is obtained by temperature correction (line not shown). The pressure loss ΔP of the pulverized coal transport pipe (13) is calculated as the difference in pressure transmitted from the line (15) in the line (1).
According to 6), the temperature correction data is sent to the arithmetic unit (18) via the line (17), and the coal removal amount is calculated by the above equation (Equation 2).
【００１６】ところで給炭量変化指示、例えばミル１台
当り３０ｔ／ｈから４０ｔ／ｈへ給炭量を変化させる指
示が給炭機モータ（３）に対してなされても、ミル
（４）の粉砕遅れ等があるので、４０ｔ／ｈに相当する
排炭量となってボイラ（２０）に供給されるまでには、
前述した様に数１０秒以上の遅れ時間がある。本実施例
では、排炭量演算値を常時求めているので、給炭量指示
値と実排炭量演算値との差を演算器（２４）で演算し、
その信号をライン（２５）によりミル（４）内の分級機
駆動モータ（１０）へ送る。こうして分級機回転数を調
整することにより、前述したミル内浮遊炭量を増減さ
せ、給炭量指示値に対する実排炭量の過不足を極めて短
時間で調整して、指示値通りの排炭量をボイラ（２０）
へ供給する。By the way, even if an instruction to change the coal feed rate is given to the coal feeder motor (3), for example, an instruction to change the coal feed rate from 30 t / h per mill to 40 t / h, the mill (4) Since there is a delay in pulverization, etc., before the coal is discharged to the boiler (20) with an amount of coal equivalent to 40 t / h,
As described above, there is a delay time of several tens seconds or more. In this embodiment, since the calculated value of the amount of coal removed is always obtained, the difference between the indicated value of the amount of coal supplied and the calculated value of the actual amount of coal removed is calculated by the calculator (24).
The signal is sent by line (25) to the classifier drive motor (10) in mill (4). By adjusting the number of revolutions of the classifier in this way, the amount of suspended coal in the mill is increased or decreased as described above. Boiler quantity (20)
Supply to
【００１７】ローラミル内には通常，給炭量の３〜５倍
の保有炭が有る。この保有炭は粉砕テーブル上炭と空間
部に浮遊している浮遊炭とに分けられる。浮遊炭は、回
転式分級機により阻止されてミル内を循環しているもの
で、粒径はミル出口粉砕炭よりもやや粗いが、量は保有
炭量の半分以上を占めていることが実測により明らかに
なった。したがって、分級機の阻止力の調整（分級機回
転数の調整）によって浮遊炭量を増減することができ、
当然また排炭量を増減することができるのである。図３
は同一給炭量で分級機回転数を変化させた時の排炭量の
変化状況を示したものであるが、回転数を増加すれば排
炭量は減少し、回転数を減少すれば排炭量が増加するこ
とが分る。[0017] In the roller mill, there is usually 3 to 5 times the amount of coal stored in the roller mill. This coal is divided into coal on the crushing table and suspended coal floating in the space. Suspended coal is circulated in the mill after being blocked by the rotary classifier, and its particle size is slightly coarser than the pulverized coal at the mill outlet, but its amount accounts for more than half of the amount of coal held. Revealed. Therefore, the amount of suspended coal can be increased or decreased by adjusting the stopping power of the classifier (adjusting the rotation speed of the classifier),
Naturally, the amount of coal emissions can be increased or decreased. FIG.
Fig. 4 shows the change in the amount of coal removed when the classifier rotation speed is changed with the same coal supply, but when the rotation speed is increased, the amount of coal removed is reduced, and when the rotation speed is reduced, the emission is reduced. It can be seen that the amount of coal increases.
【００１８】以上詳しく説明したとおり本実施例は、実
排炭量をオンラインで精度良く演算可能としたこと、回
転式分級機の回転数増減により排炭量調整を可能とした
こと、およびそれらを組み合わせたミル運転制御システ
ムにより、給炭量変化指示に対する排炭量の応答性を著
しく向上させたものである。As described in detail above, the present embodiment is characterized in that the actual amount of coal removal can be calculated with high accuracy on-line, the amount of coal removal can be adjusted by increasing or decreasing the number of revolutions of a rotary classifier. With the combined mill operation control system, the responsiveness of the coal removal amount to the coal supply amount change instruction is significantly improved.
【００１９】[0019]
【発明の効果】本発明方法によれば次の効果が得られ
る。 １） 実排炭量を常時演算して給炭量指示値との差を常
に求め、粉砕遅れのないミル内浮遊炭を排炭量の先行調
整と微調整に使用することにより、ミルや石炭の条件に
関係なく、排炭量の応答遅れ時間を従来の１／３以下に
大幅に短縮するとともに一定とし、かつ排炭量変化勾配
を指示勾配と殆んど同一とすることができる。 ２） 実排炭量を常時監視しているので、ボイラ目標出
力に対する過大過小を事前に予測できる。 ３） 上記１），２）により発電プラント全体に対して
信頼性のある円滑な運転制御ができる。According to the method of the present invention, the following effects can be obtained. 1) Always calculate the actual amount of coal removed and always calculate the difference from the indicated amount of coal supply, and use the suspended coal in the mill, which has no crushing delay, for advance adjustment and fine adjustment of the amount of coal removed. Irrespective of the above conditions, the response delay time of the coal removal amount can be greatly reduced to 1/3 or less of the conventional value and kept constant, and the coal removal amount change gradient can be made almost the same as the indicated gradient. 2) Since the actual coal emission is constantly monitored, it is possible to predict in advance whether the boiler target output is too large or too small. 3) Due to the above 1) and 2), reliable and smooth operation control can be performed for the entire power plant.
【図１】図１は本発明の一実施例を示す系統図である。FIG. 1 is a system diagram showing one embodiment of the present invention.
【図２】図２は排炭量の演算値と実測値とを比較して示
す図である。FIG. 2 is a diagram showing a comparison between a calculated value of the amount of coal removed and an actually measured value.
【図３】図３は分級機回転数と排炭量の変化状況を示す
図である。FIG. 3 is a diagram showing a change state of a classifier rotation speed and a coal exhaust amount.
【図４】図４は従来のミル運転制御方法を示す系統図で
ある。FIG. 4 is a system diagram showing a conventional mill operation control method.
【図５】図５は従来のミル運転制御方法における排炭量
特性を示す図である。FIG. 5 is a view showing a coal discharge amount characteristic in a conventional mill operation control method.
（１） 石炭ホッパー （２） 給炭機 （３） 給炭機モータ （４） ミル （５） 粉砕テーブル （６） ロール （７） テーブル上炭 （８） 浮遊炭 （９） 回転式分級機 （１０） 分級機モータ （１１） 熱風供給ライン （１２） 圧力信号ライン （１３） 微粉炭輸送管 （１４） 圧損送信ライン （１５） 圧力信号ライン （１６） 圧損送信ライン （１７） 温度信号ライン （１８） 排炭量演算器 （１９） 演算値送信ライン （２０） ボイラ （２１） 主蒸気ライン （２２） 蒸気特性送信ライン （２３） 要求電力量送信ライン （２４） 燃料系演算器 （２５） 分級機回転数指示ライン （２６） 給炭量指示ライン (1) Coal hopper (2) Coal feeder (3) Coal feeder motor (4) Mill (5) Crushing table (6) Roll (7) Charcoal on table (8) Floating coal (9) Rotary classifier ( 10) Classifier motor (11) Hot air supply line (12) Pressure signal line (13) Pulverized coal transport pipe (14) Pressure loss transmission line (15) Pressure signal line (16) Pressure loss transmission line (17) Temperature signal line (18) ) Coal removal amount calculator (19) Calculation value transmission line (20) Boiler (21) Main steam line (22) Steam characteristic transmission line (23) Required power amount transmission line (24) Fuel system computing unit (25) Classifier Revolution speed instruction line (26) Coal supply amount instruction line
───────────────────────────────────────────────────── フロントページの続き (72)発明者 飯田 豊 長崎市飽の浦町１番１号 三菱重工業株 式会社長崎造船所内 (72)発明者 丸田 得志 東京都千代田区丸の内二丁目５番１号 三菱重工業株式会社内 (56)参考文献 特開 平２−122848（ＪＰ，Ａ) 特開 平４−145957（ＪＰ，Ａ) 特開 平５−332803（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B02C 15/00 - 15/16 B02C 25/00 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yutaka Iida 1-1, Akunouracho, Nagasaki-shi Inside Nagasaki Shipyard, Mitsubishi Heavy Industries, Ltd. (72) Inventor Toshishi Maruta 2-5-1 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Heavy Industries (56) References JP-A-2-122848 (JP, A) JP-A-4-145957 (JP, A) JP-A-5-332803 (JP, A) (58) Fields surveyed (Int. Cl. 7 , DB name) B02C 15/00-15/16 B02C 25/00
Claims (1)
ラミルにおいて、上記ローラミルに供給される搬送気体
の流量と上記ローラミルから排出される微粉炭の輸送管
の圧損とを計測し、それら計測値に基づいて上記微粉炭
の流量を演算するとともに、上記ローラミルに石炭を供
給する給炭機に与えられる給炭量指示信号を上記演算の
結果に基づいて修正し、かつ上記回転式分級機の回転数
を上記演算結果に基づいて制御することを特徴とするロ
ーラミルの運転制御方法。In a roller mill for coal pulverization provided with a rotary classifier, a flow rate of a carrier gas supplied to the roller mill and a pressure loss of a transport pipe for pulverized coal discharged from the roller mill are measured. While calculating the flow rate of the pulverized coal based on the value, the coal feed amount instruction signal given to the coal feeder that supplies coal to the roller mill is corrected based on the result of the calculation, and the rotary classifier is An operation control method for a roller mill, wherein the number of revolutions is controlled based on the result of the calculation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04155049A JP3129347B2 (en) | 1992-06-15 | 1992-06-15 | Roller mill operation control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04155049A JP3129347B2 (en) | 1992-06-15 | 1992-06-15 | Roller mill operation control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05345144A JPH05345144A (en) | 1993-12-27 |
| JP3129347B2 true JP3129347B2 (en) | 2001-01-29 |
Family
ID=15597559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04155049A Expired - Lifetime JP3129347B2 (en) | 1992-06-15 | 1992-06-15 | Roller mill operation control method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3129347B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5875977A (en) * | 1998-05-13 | 1999-03-02 | Combustion Engineering, Inc. | Technique for improving the response time of pulverized coal boilers |
-
1992
- 1992-06-15 JP JP04155049A patent/JP3129347B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05345144A (en) | 1993-12-27 |
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