JP2006102666A - Mill and coal fired boiler provided with it - Google Patents

Mill and coal fired boiler provided with it Download PDF

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JP2006102666A
JP2006102666A JP2004293838A JP2004293838A JP2006102666A JP 2006102666 A JP2006102666 A JP 2006102666A JP 2004293838 A JP2004293838 A JP 2004293838A JP 2004293838 A JP2004293838 A JP 2004293838A JP 2006102666 A JP2006102666 A JP 2006102666A
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mill
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temperature
outlet temperature
air
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JP4638708B2 (en
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Moriji Miyake
盛士 三宅
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Babcock Hitachi Kk
バブコック日立株式会社
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<P>PROBLEM TO BE SOLVED: To provide a mill capable of being safely and stably operated. <P>SOLUTION: The mill is provided with a measuring means 51 of the temperature of an opening of the mill which measures the air temperature of the opening of the mill for mixed air, a setting means 63 of the temperature of a charge opening of the mill which sets the temperature of the charge opening of the mill, a detecting means 61 which detects that the measured temperature of the charge opening of the mill becomes not lower than the set temperature of the charge opening of the mill compared with the measured temperature of the charge opening of the mill and the set temperature of the charge opening of the mill, and an altering means 65, 68 of the set temperature of the discharge opening of the mill which lowers the set temperature of the discharge opening of the mill of a setting means of the temperature of a discharge opening of the mill based on a controlling signal from the detecting means 61. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、例えば石炭、セメント、クリンカ、各種工業材料などを粉砕するミル装置に係り、特にそれのミル入口温度制御装置に関する。  The present invention relates to a mill device for pulverizing, for example, coal, cement, clinker, various industrial materials, and the like, and more particularly to a mill inlet temperature control device for the mill device.
石炭焚ボイラ設備に付設するミル装置は図4に示すように、熱空気1の流量を熱空気ダンパ3により、冷空気2の流量を冷空気ダンパ4により、それぞれ調節し、熱空気ダクト5と冷空気ダクト6の合流部7で両者が混合され、ミル入口部9に導入される。  As shown in FIG. 4, the mill apparatus attached to the coal fired boiler facility adjusts the flow rate of hot air 1 using a hot air damper 3 and the flow rate of cold air 2 using a cold air damper 4. Both are mixed at the junction 7 of the cold air duct 6 and introduced into the mill inlet 9.
ミル8の内部では別の系統から投入された石炭が粉砕ローラ(または粉砕ボール)によって微粉炭化され、ミル入口部9から導入された前記空気により乾燥(暖気)されながらミル出口部10に搬送され、微粉炭管11を経由して石炭バーナ12へ導かれ、火炉13で燃焼に供される。  Inside the mill 8, coal input from another system is finely carbonized by a pulverizing roller (or pulverizing ball), and conveyed to the mill outlet 10 while being dried (warmed) by the air introduced from the mill inlet 9. Then, it is guided to the coal burner 12 through the pulverized coal pipe 11 and is used for combustion in the furnace 13.
この際に微粉炭およびその搬送空気が適切な温度に加温されないと、石炭バーナ12での冷却を招き、燃焼不良となる。そのためミル出口部10に設置したミル出口温度計52により微粉炭と搬送空気の温度を計測して、信号設定器54によって設定されているミル出口温度設定値59と減算器53で差分を演算し、その偏差信号55を比例・積分制御器56にかけ、冷空気ダンパ4の開度指令信号57とするミル入口(出口)温度フィードバック制御系を構成して空気温度制御している。  At this time, if the pulverized coal and its carrier air are not heated to an appropriate temperature, the coal burner 12 is cooled, resulting in poor combustion. Therefore, the temperature of the pulverized coal and the conveying air is measured by the mill outlet thermometer 52 installed at the mill outlet 10, and the difference is calculated by the mill outlet temperature set value 59 set by the signal setting unit 54 and the subtractor 53. The deviation signal 55 is applied to a proportional / integral controller 56 to configure a mill inlet (outlet) temperature feedback control system for opening degree command signal 57 of the cold air damper 4 to control the air temperature.
なお、この際に冷空気ダンパ4の開度指令信号57に対して逆特性を持たせる関数発生器58を設置して、その出力信号を用いて熱空気ダンパ3を動作させることにより、熱空気1と冷空気2の流量の比率を制御する方式をとるのが一般的である。  At this time, a function generator 58 having reverse characteristics with respect to the opening degree command signal 57 of the cold air damper 4 is installed, and the hot air damper 3 is operated by using the output signal to thereby generate hot air. Generally, a method of controlling the ratio of the flow rate of 1 and cold air 2 is adopted.
近年、石炭燃料のコストダウンを追求する傾向により、水分含有量が多く且つ低燃比炭、すなわち、亜瀝青炭と称される石炭を使用するニーズが高まっているが、そのような燃料を使用した場合、水分量の多さにより、その潜熱分が前記したミル暖気時の熱を大量に消費するため、ミル出口温度が上がりにくい状態となる。  In recent years, due to the trend of pursuing cost reduction of coal fuel, there is an increasing need to use low-fuel coal with a high water content, that is, sub-bituminous coal. When such fuel is used Because of the large amount of water, the latent heat consumes a large amount of heat during the above-described warming of the mill, so that the mill outlet temperature is unlikely to rise.
そのため、前記従来技術によるミル入口(出口)温度フィードバック制御のままであると、その制御動作により、ミル出口温度の不達分に対して冷空気2を減少し、熱空気1を増加させる動作で補償を繰り返し、結果的にミル入口部9の空気温度が非常に高い状態でバランスすることになる。このようになると、最悪の場合、石炭の発火温度を超えて発火事故を起すことになり、ミル入口温度が過剰に上昇することを防止しなければならない。  For this reason, if the mill inlet (outlet) temperature feedback control according to the prior art is maintained, the control operation is performed to reduce the cold air 2 and increase the hot air 1 with respect to the unachieved portion of the mill outlet temperature. Compensation is repeated, and as a result, the air temperature at the mill inlet 9 is balanced in a very high state. When this happens, in the worst case, an ignition accident will occur beyond the ignition temperature of the coal, and the mill inlet temperature must be prevented from excessively rising.
このような問題に対処するため、下記特許文献1に記載されているような提案がある。この提案では、ミル入口温度が上昇したことを検知すると、一旦、熱空気ダンパ3と冷空気ダンパ4の開度調整を中止してミル出口温度制御を中止すると共に、ミル入口空気温度偏差信号55に応じてミル一次空気流量を増加するように制御するものである。
特開平10−281453号公報
In order to deal with such a problem, there is a proposal as described in Patent Document 1 below. In this proposal, when it is detected that the mill inlet temperature has risen, the opening adjustment of the hot air damper 3 and the cold air damper 4 is temporarily stopped to stop the mill outlet temperature control, and the mill inlet air temperature deviation signal 55 is also stopped. According to the control, the mill primary air flow rate is controlled to increase.
JP-A-10-281453
前記特許文献1記載のものでは、次のような問題点がある。
(1) 熱空気ダンパ3と冷空気ダンパ4の開度調整を中止するだけなので、基本的に一旦上昇したミル入口温度を下げるものではなく、ミル入口部での発火危険状態から離脱できない可能性がある。
The thing of the said patent document 1 has the following problems.
(1) Since the adjustment of the opening degree of the hot air damper 3 and the cold air damper 4 is only canceled, the temperature of the mill inlet that has once increased is not basically lowered, and there is a possibility that it cannot be removed from the ignition danger state at the mill inlet. There is.
(2) ミル入口空気温度偏差信号55に応じてミル一次空気流量を増加させることにより、燃焼排ガス中に含まれる窒素酸化物の温度上昇などの悪影響が懸念される。 (2) By increasing the mill primary air flow rate according to the mill inlet air temperature deviation signal 55, there is a concern about adverse effects such as temperature rise of nitrogen oxides contained in the combustion exhaust gas.
(3) ミル一次空気流量の増加は、ミル内に投入される熱量の絶対的な量を増加することになり、ミル入口部を含めたミル内部の全体的な温度上昇を招き、最悪の場合、発火危険状態がさらに促進される。 (3) An increase in the primary air flow rate of the mill will increase the absolute amount of heat input into the mill, leading to an overall temperature rise inside the mill including the mill inlet, which is the worst case. Further, the ignition danger state is further promoted.
本発明の目的は、このような従来技術の欠点を解消し、安全でかつ安定な運転ができるミル装置ならびにそれを備えた石炭焚ボイラ設備を提供することにある。  An object of the present invention is to provide a mill apparatus capable of solving the above-described drawbacks of the prior art and capable of safe and stable operation, and a coal fired boiler facility equipped with the mill apparatus.
前記目的を達成するため本発明の第1の手段は、例えば熱空気ダクト、冷空気ダクトならびに合流部などを有する熱空気と冷空気を混合する空気混合手段と、
その空気混合手段で混合された混合空気を導入して、内部で粉砕した粉砕物を前記混合空気で乾燥するとともに、外部の粉砕物供給先に気相搬送するミルと、
ミル出口側の搬送空気温度を計測するミル出口温度計測手段と、
ミル出口温度を設定するミル出口温度設定手段と、
前記ミル出口温度計測値とミル出口温度設定値の偏差を求める減算手段と、
その減算手段からの偏差信号に基づいて前記空気混合手段による熱空気と冷空気の混合流量比率を調整する例えば熱空気ダンパや冷空気ダンパなどを有する流量比率調整手段とを備えたミル装置を対象とするものである。
In order to achieve the above object, the first means of the present invention includes, for example, an air mixing means for mixing hot air and cold air having a hot air duct, a cold air duct and a merging section, and the like.
A mill that introduces mixed air mixed by the air mixing means, dries the pulverized material internally crushed with the mixed air, and conveys the gas to an external pulverized material supply destination;
A mill outlet temperature measuring means for measuring the conveying air temperature on the mill outlet side;
Mill outlet temperature setting means for setting the mill outlet temperature;
Subtraction means for obtaining a deviation between the mill outlet temperature measurement value and the mill outlet temperature setting value;
For example, a mill apparatus including a flow rate ratio adjusting unit having a hot air damper, a cold air damper, or the like that adjusts a mixing flow rate ratio of hot air and cold air by the air mixing unit based on a deviation signal from the subtracting unit It is what.
そして前記混合空気のミル入口空気温度を計測するミル入口温度計測手段と、
ミル入口温度を設定するミル入口温度設定手段と、
前記ミル入口温度計測値とミル入口温度設定値とを比較して、ミル入口温度計測値がミル入口温度設定値以上になったことを検知する例えばモニタリレーなどの検知手段と、
その検知手段からの制御信号によって前記ミル出口温度設定手段のミル出口温度設定値を下げる例えばフリップ・フロップ回路ならびにアナログスイッチなどのミル出口温度設定値変更手段とを備えたことを特徴とするものである。
And mill inlet temperature measuring means for measuring the mill inlet air temperature of the mixed air,
Mill inlet temperature setting means for setting the mill inlet temperature;
The mill inlet temperature measurement value and the mill inlet temperature set value are compared, and detection means such as a monitor relay for detecting that the mill inlet temperature measured value is equal to or higher than the mill inlet temperature set value,
For example, a flip-flop circuit and a mill outlet temperature setting value changing means such as an analog switch for lowering the mill outlet temperature setting value of the mill outlet temperature setting means by a control signal from the detecting means are provided. is there.
本発明の第2の手段は前記第1の手段において、前記ミル出口温度設定値変更手段によりミル出口温度設定値を下げた状態からミル出口温度設定値を元の値に戻す例えばモニタリレー、フリップ・フロップ回路ならびにアナログスイッチなどの設定値復帰手段を設けたことを特徴とするものである。   According to a second means of the present invention, in the first means, the mill outlet temperature setting value is returned to the original value from the state where the mill outlet temperature setting value is lowered by the mill outlet temperature setting value changing means. A set value return means such as a flop circuit and an analog switch is provided.
本発明の第3の手段は前記第1の手段において、前記ミル出口温度設定値変更手段によりミル出口温度設定値を下げる際に規定の変化率で設定値を徐々に下げる例えば変化率制限器などの変化率制限手段と、
その変化率制限手段によってミル出口温度設定値を下げている途中で前記ミル入口温度計測値がミル入口温度設定値まで下がると、ミル出口温度設定値を下げる動作を中止して、その時点のミル出口温度設定値をホールドする例えばNOT回路、AND回路ならびにONディレータイマーなどからなる設定値ホールド手段を設けたことを特徴とするものである。
According to a third means of the present invention, in the first means, when the mill outlet temperature setting value is lowered by the mill outlet temperature setting value changing means, the setting value is gradually lowered at a prescribed rate of change. Change rate limiting means,
If the measured value at the mill inlet temperature falls to the mill inlet temperature set value while the mill outlet temperature set value is being lowered by the change rate limiting means, the operation of lowering the mill outlet temperature set value is stopped, and the mill at that time is stopped. The present invention is characterized in that a set value holding means including, for example, a NOT circuit, an AND circuit, and an ON delay timer for holding the outlet temperature set value is provided.
本発明の第4の手段は前記第1の手段において、粉砕物が石炭で、その粉砕物の供給先が石炭焚ボイラ設備であって、前記ミル入口温度設定値が石炭発火温度よりも低い温度であることを特徴とするものである。   According to a fourth means of the present invention, in the first means, the pulverized product is coal, the pulverized product is supplied to a coal fired boiler facility, and the mill inlet temperature set value is lower than the coal ignition temperature. It is characterized by being.
本発明の第5の手段は、石炭を粉砕して微粉炭を生成するとともに入口空気温度を制御するミル装置と、そのミル装置から気相搬送された微粉炭を燃焼するバーナを有する火炉とを備えた石炭焚ボイラ設備において、前記ミル装置が前記第1ないし第4の手段のミル装置であることを特徴とするものである。   The fifth means of the present invention comprises a mill device that pulverizes coal to generate pulverized coal and controls the inlet air temperature, and a furnace having a burner that burns pulverized coal conveyed in a vapor phase from the mill device. In the coal fired boiler equipment provided, the mill device is a mill device of the first to fourth means.
本発明は前述のような構成になっており、ミル入口温度の過剰上昇による発火事故が有効に防止できて、ミル出口温度制御が継続できるため、安全かつ安定な運転が可能である。  The present invention is configured as described above, and can effectively prevent a fire accident due to an excessive increase in the mill inlet temperature, and can continue the mill outlet temperature control, thereby enabling safe and stable operation.
本発明の実施形態を図と共に説明する。図1は、本発明の第1実施形態に係るミル入口温度制御系統図である。  An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a mill inlet temperature control system diagram according to the first embodiment of the present invention.
熱空気1の流量を熱空気ダンパ3により、冷空気2の流量を冷空気ダンパ4によりそれぞれ調節し、熱空気ダクト5と冷空気ダクト6の合流部7で両者が混合され、ミル入口部9に導入される。  The flow rate of the hot air 1 is adjusted by the hot air damper 3 and the flow rate of the cold air 2 is adjusted by the cold air damper 4. The hot air duct 5 and the cold air duct 6 are mixed at the junction 7, and the mill inlet 9 To be introduced.
ミル8の内部では別の系統から投入された石炭が粉砕ローラ(または粉砕ボール)によって微粉炭化され、ミル入口部9から導入された前記空気により乾燥(暖気)されながらミル出口部10に搬送され、微粉炭管11を経由して石炭バーナ12へ導かれ、火炉13での燃焼に供される。  Inside the mill 8, coal input from another system is finely carbonized by a pulverizing roller (or pulverizing ball), and conveyed to the mill outlet 10 while being dried (warmed) by the air introduced from the mill inlet 9. Then, it is guided to the coal burner 12 through the pulverized coal pipe 11 and used for combustion in the furnace 13.
この際に微粉炭およびその搬送空気が適切な温度に加温されないと、石炭バーナ12での冷却を招き、燃焼不良となる。そのためミル出口部10に設置したミル出口温度計52により微粉炭と搬送空気の温度を計測する。  At this time, if the pulverized coal and its carrier air are not heated to an appropriate temperature, the coal burner 12 is cooled, resulting in poor combustion. Therefore, the temperature of pulverized coal and carrier air is measured by the mill exit thermometer 52 installed in the mill exit section 10.
一方、ミル入口部9にミル入口温度計51を設置し、それで検出されたミル入口温度測定値60をモニタリレー61に与えて、石炭発火温度よりも低いミル入口温度設値以上になったかどうかを判断する。なお、ミル入口温度設値は信号設定器63によってモニタリレー61に与えられ、前記ミル入口温度測定値60がミル入口温度設値以上になると、その判断信号に基づいてフリップ・フロップ回路65をセットする。  On the other hand, the mill inlet thermometer 51 is installed in the mill inlet 9 and the detected mill inlet temperature 60 is given to the monitor relay 61 to determine whether the mill inlet temperature is lower than the coal ignition temperature. Judging. The mill inlet temperature setting value is given to the monitor relay 61 by the signal setting unit 63. When the mill inlet temperature measurement value 60 becomes equal to or higher than the mill inlet temperature setting value, the flip-flop circuit 65 is set based on the judgment signal. To do.
フリップ・フロップ回路65がセットされると、アナログスイッチ68の出力が信号設定器67で与えられる「0℃」の値から信号設定器66で与えられる「−α℃」の値に切り替わり、急激な変化を抑制するため変化率制限器69を経て加算器70に入力される。加算器70では信号設定器54によって予め設定されているミル出口温度設定値59に前記「−α℃」の値が加算されてミル出口温度設定値59がα℃だけ下げられ、その結果が減算器53に入力されてミル出口温度計測値との差分が演算される。  When the flip-flop circuit 65 is set, the output of the analog switch 68 is switched from the value “0 ° C.” given by the signal setting device 67 to the value “−α ° C.” given by the signal setting device 66, and suddenly. In order to suppress the change, the signal is input to the adder 70 via the change rate limiter 69. In the adder 70, the value of “−α ° C.” is added to the mill outlet temperature set value 59 preset by the signal setter 54 to lower the mill outlet temperature set value 59 by α ° C., and the result is subtracted. The difference between the measured value and the mill outlet temperature measurement value is calculated.
その偏差信号55を比例・積分制御器56にかけ、冷空気ダンパ4の開度指令信号57とするミル入口(出口)温度フィードバック制御系を構成している。  The deviation signal 55 is applied to the proportional / integral controller 56 to constitute a mill inlet (outlet) temperature feedback control system for the opening degree command signal 57 of the cold air damper 4.
なお、この際に冷空気ダンパ4の開度指令信号57に対して逆特性を持たせる関数発生器58を設置して、その出力信号を用いて熱空気ダンパ3を動作させることにより、熱空気1と冷空気2の流量の比率を制御するようになっている。  At this time, a function generator 58 having reverse characteristics with respect to the opening degree command signal 57 of the cold air damper 4 is installed, and the hot air damper 3 is operated by using the output signal to thereby generate hot air. The ratio of the flow rate of 1 and cold air 2 is controlled.
先に述べたフィードバック制御動作が行われて、ミル入口温度が低下していき、ミル出口温度設定値59がα℃下げられたのに応じたバランス温度に落ち着き目的を達する。  The above-described feedback control operation is performed, the mill inlet temperature decreases, and the balance temperature corresponding to the mill outlet temperature set value 59 being lowered by α ° C. is settled to achieve the purpose.
この状態から状況が変化し、ミル入口温度が低下するとミル出口温度設定値を元の値に戻すことになるが、その際は先のミル入口温度が上昇する際の設定値に比べて十分低い値の設定値を信号設定器64で設定しておき、ミル入口温度測定値60がこの値以下になったことをモニタリレー62で検知し、フリップ・フロップ回路65をリセットする。そしてアナログスイッチ68の信号を「0℃」側の信号設定器67の信号に切替えて、変化率制限器69を経て、加算器70に加算される。これにより、通常のミル出口温度制御に復帰する。  If the situation changes from this state and the mill inlet temperature falls, the mill outlet temperature set value will be restored to the original value, but in that case it is sufficiently lower than the set value when the previous mill inlet temperature rises The set value is set by the signal setting unit 64, and the monitor relay 62 detects that the mill inlet temperature measurement value 60 is equal to or lower than this value, and the flip-flop circuit 65 is reset. Then, the signal of the analog switch 68 is switched to the signal of the signal setting unit 67 on the “0 ° C.” side, and is added to the adder 70 through the change rate limiter 69. This returns to normal mill exit temperature control.
図2は、本発明の第2実施形態に係るミル入口温度制御系統図である。前記第1実施形態では、ミル入口温度が低下して信号設定器64によって設定されているミル入口温度設定値以下に到達したことを検出して、ミル出口温度設定値を自動的に通常の設定値に戻した。  FIG. 2 is a mill inlet temperature control system diagram according to the second embodiment of the present invention. In the first embodiment, it is detected that the mill inlet temperature has fallen and reached below the mill inlet temperature set value set by the signal setter 64, and the mill outlet temperature set value is automatically set to the normal setting. Returned to value.
この第2実施形態ではオペレータの判断で、通常のミル出口温度設定値に戻すことができるようにフリップ・フロップ回路65をリセット側に押しボタン71あるいは手動切り替えスイッチの接点信号をフリップ・フロップ回路65に入力する構成になっている。他の構成ならびに動作は前記第1実施形態と同様であるので、それらの説明は省略する。  In this second embodiment, the flip-flop circuit 65 is pushed to the reset side so that the normal mill outlet temperature set value can be restored at the operator's discretion, and the contact signal of the push button 71 or the manual changeover switch is sent to the flip-flop circuit 65. Is configured to input. Other configurations and operations are the same as those in the first embodiment, and a description thereof will be omitted.
図3は、第3実施形態に係るミル入口温度制御系統図である。図中の符号81はNOT回路、82はAND回路、83はONディレータイマーである。  FIG. 3 is a mill inlet temperature control system diagram according to the third embodiment. In the figure, reference numeral 81 is a NOT circuit, 82 is an AND circuit, and 83 is an ON delay timer.
この実施形態は、ミル入口温度が信号設定器63で与えられるミル入口温度設定値以上になったことをモニタリレー61で検知し、フリップ・フロップ回路65がセットされ、アナログスイッチ68の選択信号が「−α℃」側に切り替わり、変化率制限器69によりゆっくりと「0℃」側から「−α℃」に変化中に、信号設定器63で与えられる設定値以下にした場合(「−α℃」側に切り替える判断の基準となった温度高の状態が回復した状況になったことを意味している)、変化率制限器69の変化率の設定を0にし、その出力信号(その時点でのミル出口温度設定値)がホールドされ、ミル出口温度設定値がそれ以上下がらないようにする機能を、前記第1実施形態に付加したものである。  In this embodiment, the monitor relay 61 detects that the mill inlet temperature has become equal to or higher than the mill inlet temperature set value given by the signal setter 63, the flip-flop circuit 65 is set, and the selection signal of the analog switch 68 is When switching to the “−α ° C.” side and slowly changing from the “0 ° C.” side to the “−α ° C.” by the change rate limiter 69, the value is made to be equal to or lower than the set value given by the signal setting unit 63 (“−α This means that the state of the high temperature that has been a criterion for switching to “° C.” has been recovered), the change rate setting of the change rate limiter 69 is set to 0, and the output signal (at that time) The function of preventing the mill outlet temperature setting value from being further lowered is added to the first embodiment.
なお、前記第1実施形態と同様に状況が変化して、ミル入口温度が十分に低下した場合は、自動的に元のミル出口温度制御設定値に回復させるため、モニタリレー62によりこれを検知し、フリップ・フロップ回路65をリセットして、アナログスイッチ68の選択を「0℃」側に切り替える機能を有している。  If the situation changes and the mill inlet temperature is sufficiently lowered as in the first embodiment, the monitor relay 62 detects this to automatically restore the original mill outlet temperature control setting value. In addition, the flip-flop circuit 65 is reset to switch the selection of the analog switch 68 to the “0 ° C.” side.
このように温度高の状態が正常範囲に回復した時点で、ミル出口温度制御設定値をそれ以上低下させないようにすることで、石炭バーナ12に送り込む微粉炭と搬送空気の温度が必要以上に低下するのを防止し、燃焼性能の悪化を可及的に防止するのに効果がある。  When the high temperature state is restored to the normal range in this way, the temperature of the pulverized coal fed to the coal burner 12 and the temperature of the conveying air is unnecessarily lowered by preventing the mill outlet temperature control setting value from being further reduced. This is effective in preventing the deterioration of combustion performance as much as possible.
瀝青炭や亜瀝青炭でも含有する水分量にはばらつきがあリ、ミル入口温度の上昇傾向の程度に差があるため、本発明の実施形態ではその状況に応じたミル入口温度制御が可能である。  Since the amount of water contained in bituminous coal and subbituminous coal varies, and the degree of rising tendency of the mill inlet temperature varies, in the embodiment of the present invention, mill inlet temperature control according to the situation is possible.
前記実施形態では粉砕物として石炭を用いる例を示したが、本発明のミル装置はこれに限定されるものできなく、例えばセメント、クリンカ、各種工業材料など他の粉砕物を粉砕するミル装置にも適用可能である。   In the above-described embodiment, an example in which coal is used as the pulverized product has been shown. However, the mill apparatus of the present invention is not limited to this. Is also applicable.
本発明の第1実施形態例に係るミル入口温度制御系統図である。It is a mill inlet temperature control system diagram concerning the 1st example of an embodiment of the present invention. 本発明の第2実施形態例に係るミル入口温度制御系統図である。It is a mill inlet temperature control system diagram concerning the example of a 2nd embodiment of the present invention. 本発明の第3実施形態例に係るミル入口温度制御系統図である。It is a mill inlet temperature control system diagram concerning the example of a 3rd embodiment of the present invention. 従来技術に係るミル入口温度制御系統図である。It is a mill inlet temperature control system diagram concerning a prior art.
符号の説明Explanation of symbols
1:熱空気、2:冷空気、3:熱空気ダンパ、4:冷空気ダンパ、5:熱空気ダクト、6:冷空気ダクト、7:合流部、8:ミル、9:ミル入口部、10:ミル出口部、11:微粉炭管、12:石炭バーナ、13:火炉、51:ミル入口温度計、52:ミル出口温度計、53:減算器、54:信号設定器、55:偏差信号、56:比例・積分制御器、57:開度指令信号、58:関数発生器、59:ミル出口温度設定値、60:ミル入口温度測定値、61:モニタリレー、62:モニタリレー、63:信号設定器、64:信号設定器、65:フリップ・フロップ回路、66:信号設定器、67:信号設定器、68:アナログスイッチ、69:変化率制限器、70:加算器、71:押しボタン、81:NOT回路、82:AND回路、83:ONディレータイマー。   1: hot air, 2: cold air, 3: hot air damper, 4: cold air damper, 5: hot air duct, 6: cold air duct, 7: confluence, 8: mill, 9: mill inlet, 10 : Mill outlet, 11: pulverized coal pipe, 12: coal burner, 13: furnace, 51: mill inlet thermometer, 52: mill outlet thermometer, 53: subtractor, 54: signal setter, 55: deviation signal, 56: Proportional / integral controller, 57: Opening command signal, 58: Function generator, 59: Mill outlet temperature set value, 60: Mill inlet temperature measured value, 61: Monitor relay, 62: Monitor relay, 63: Signal Setter, 64: Signal setter, 65: Flip-flop circuit, 66: Signal setter, 67: Signal setter, 68: Analog switch, 69: Change rate limiter, 70: Adder, 71: Push button, 81: NOT circuit, 82: AND circuit, 83: O Delay timer.

Claims (5)

  1. 熱空気と冷空気を混合する空気混合手段と、
    その空気混合手段で混合された混合空気を導入して、内部で粉砕した粉砕物を前記混合空気で乾燥するとともに、外部の粉砕物供給先に気相搬送するミルと、
    ミル出口側の搬送空気温度を計測するミル出口温度計測手段と、
    ミル出口温度を設定するミル出口温度設定手段と、
    前記ミル出口温度計測値とミル出口温度設定値の偏差を求める減算手段と、
    その減算手段からの偏差信号に基づいて前記空気混合手段による熱空気と冷空気の混合流量比率を調整する流量比率調整手段とを備えたミル装置において、
    前記混合空気のミル入口空気温度を計測するミル入口温度計測手段と、
    ミル入口温度を設定するミル入口温度設定手段と、
    前記ミル入口温度計測値とミル入口温度設定値とを比較して、ミル入口温度計測値がミル入口温度設定値以上になったことを検知する検知手段と、
    その検知手段からの制御信号によって前記ミル出口温度設定手段のミル出口温度設定値を下げるミル出口温度設定値変更手段と
    を備えたことを特徴とするミル装置。
    An air mixing means for mixing hot air and cold air;
    A mill that introduces mixed air mixed by the air mixing means, dries the pulverized material internally crushed with the mixed air, and conveys the gas to an external pulverized material supply destination;
    A mill outlet temperature measuring means for measuring the conveying air temperature on the mill outlet side;
    Mill outlet temperature setting means for setting the mill outlet temperature;
    Subtraction means for obtaining a deviation between the mill outlet temperature measurement value and the mill outlet temperature setting value;
    In a mill apparatus comprising flow rate adjusting means for adjusting the mixing flow rate ratio of hot air and cold air by the air mixing means based on a deviation signal from the subtracting means,
    Mill inlet temperature measuring means for measuring the mill inlet air temperature of the mixed air;
    Mill inlet temperature setting means for setting the mill inlet temperature;
    Detecting means for comparing the mill inlet temperature measurement value with the mill inlet temperature setting value, and detecting that the mill inlet temperature measurement value is equal to or higher than the mill inlet temperature setting value;
    A mill apparatus comprising: a mill outlet temperature setting value changing means for lowering a mill outlet temperature setting value of the mill outlet temperature setting means by a control signal from the detecting means.
  2. 請求項1記載のミル装置において、
    前記ミル出口温度設定値変更手段によりミル出口温度設定値を下げた状態からミル出口温度設定値を元の値に戻す設定値復帰手段を設けたことを特徴とするミル装置。
    The mill device according to claim 1, wherein
    A mill apparatus, comprising: a set value return means for returning the mill outlet temperature set value to the original value from a state where the mill outlet temperature set value is lowered by the mill outlet temperature set value changing means.
  3. 請求項1記載のミル装置において、
    前記ミル出口温度設定値変更手段によりミル出口温度設定値を下げる際に規定の変化率で設定値を徐々に下げる変化率制限手段と、
    その変化率制限手段によってミル出口温度設定値を下げている途中で前記ミル入口温度計測値がミル入口温度設定値まで下がると、ミル出口温度設定値を下げる動作を中止して、その時点のミル出口温度設定値をホールドする設定値ホールド手段を設けたことを特徴とするミル装置。
    The mill device according to claim 1, wherein
    Change rate limiting means for gradually lowering the set value at a specified change rate when lowering the mill outlet temperature set value by the mill outlet temperature set value changing means,
    If the measured value at the mill inlet temperature falls to the mill inlet temperature set value while the mill outlet temperature set value is being lowered by the change rate limiting means, the operation of lowering the mill outlet temperature set value is stopped, and the mill at that time is stopped. A mill apparatus comprising set value holding means for holding an outlet temperature set value.
  4. 請求項1記載のミル装置において、
    前記粉砕物が石炭で、その粉砕物の供給先が石炭焚ボイラ設備であって、
    前記ミル入口温度設定値が石炭発火温度よりも低い温度であることを特徴とするミル装置。
    The mill device according to claim 1, wherein
    The pulverized product is coal, and the supply destination of the pulverized product is a coal fired boiler facility,
    The mill apparatus, wherein the mill inlet temperature set value is lower than the coal ignition temperature.
  5. 石炭を粉砕して微粉炭を生成するとともに入口空気温度を制御するミル装置と、
    そのミル装置から気相搬送された微粉炭を燃焼するバーナを有する火炉とを備えた石炭焚ボイラ設備において、
    前記ミル装置が請求項1ないし4のいずれか1項記載のミル装置であることを特徴とする石炭焚ボイラ設備。
    A mill device for pulverizing coal to produce pulverized coal and controlling the inlet air temperature;
    In a coal fired boiler facility equipped with a furnace having a burner for burning pulverized coal conveyed in a vapor phase from the mill device,
    A coal fired boiler facility, wherein the mill device is the mill device according to any one of claims 1 to 4.
JP2004293838A 2004-10-06 2004-10-06 Mill device and coal fired boiler equipment provided with the same Active JP4638708B2 (en)

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WO2008068883A1 (en) * 2006-12-07 2008-06-12 Ihi Corporation Coal burning boiler apparatus
CN103331202A (en) * 2013-04-24 2013-10-02 广东电网公司电力科学研究院 Coal mill outlet temperature setting method
JP2013221684A (en) * 2012-04-16 2013-10-28 Central Research Institute Of Electric Power Industry Combustion method for coal mixed fuel in boiler
US8590464B2 (en) 2007-03-26 2013-11-26 Mitsubishi Heavy Industries, Ltd. Pulverized coal concentration adjustment apparatus and pulverized coal combustion boiler
JP2014114994A (en) * 2012-12-07 2014-06-26 Nippon Steel & Sumitomo Metal Device and method for temperature control of crushing plant, and computer program
JP2014159900A (en) * 2013-02-19 2014-09-04 Idemitsu Kosan Co Ltd Crushed state determination program of crushing equipment, combustion efficiency determination program of coal, crushed state determination device of crushing equipment and combustion efficiency determination device of coal
JP2014231049A (en) * 2013-05-30 2014-12-11 中国電力株式会社 Mill temperature control method
CN104801416A (en) * 2015-04-23 2015-07-29 东南大学 Control system and control method for outlet temperature of novel coal mill

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CN103341396A (en) * 2013-07-28 2013-10-09 洛阳理工学院 Dual temperature measurement and control protective device for main bearing of cement mill

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Publication number Priority date Publication date Assignee Title
WO2008068883A1 (en) * 2006-12-07 2008-06-12 Ihi Corporation Coal burning boiler apparatus
JP2008145007A (en) * 2006-12-07 2008-06-26 Ihi Corp Coal burning boiler
US8590464B2 (en) 2007-03-26 2013-11-26 Mitsubishi Heavy Industries, Ltd. Pulverized coal concentration adjustment apparatus and pulverized coal combustion boiler
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JP2014114994A (en) * 2012-12-07 2014-06-26 Nippon Steel & Sumitomo Metal Device and method for temperature control of crushing plant, and computer program
JP2014159900A (en) * 2013-02-19 2014-09-04 Idemitsu Kosan Co Ltd Crushed state determination program of crushing equipment, combustion efficiency determination program of coal, crushed state determination device of crushing equipment and combustion efficiency determination device of coal
CN103331202A (en) * 2013-04-24 2013-10-02 广东电网公司电力科学研究院 Coal mill outlet temperature setting method
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CN104801416A (en) * 2015-04-23 2015-07-29 东南大学 Control system and control method for outlet temperature of novel coal mill

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