JP4786560B2 - Soot blower device and operation method thereof - Google Patents

Soot blower device and operation method thereof Download PDF

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JP4786560B2
JP4786560B2 JP2007012039A JP2007012039A JP4786560B2 JP 4786560 B2 JP4786560 B2 JP 4786560B2 JP 2007012039 A JP2007012039 A JP 2007012039A JP 2007012039 A JP2007012039 A JP 2007012039A JP 4786560 B2 JP4786560 B2 JP 4786560B2
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speed
heat exchanger
center position
axial center
soot blower
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JP2008175514A (en
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裕敏 坂田
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Chugoku Electric Power Co Inc
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Description

本発明は、軸心周りに回転される熱交換器の半径方向中央位置周辺の清掃効率を向上することが可能なスートブロワ装置およびその運転方法に関する。   The present invention relates to a soot blower device capable of improving the cleaning efficiency around the center position in the radial direction of a heat exchanger rotated about an axis, and an operation method thereof.

軸心周りに回転駆動される筒体状の回転再生式熱交換器を清掃するための装置として、スートブロワ装置が周知となっている（例えば、特許文献１参照）。このスートブロワ装置は、一方向に定速で連続的に回転駆動される回転駆動モータと、回転駆動モータの回転出力で一方向に定速で連続的に回転駆動されるスイングレバーと、スイングレバーと蒸気配管周りに回転自在に設けられたスリーブとの間に設けられ、スイングレバーの回転運動でスリーブを反復往復回転させるリンク機構と、スリーブに設けられ、当該スリーブの反復往復回転で往復揺動される長尺状の清掃用ノズルとから構成されている。そして、ノズルは、回転駆動モータによりスイングレバーが一回転されることで、筒体状の熱交換器の軸心位置と最外周位置との間を一回往復揺動するように設定されている。   As a device for cleaning a cylindrical rotary regenerative heat exchanger that is driven to rotate about an axis, a soot blower device is well known (see, for example, Patent Document 1). The soot blower device includes a rotation drive motor that is continuously driven to rotate at a constant speed in one direction, a swing lever that is continuously driven to rotate at a constant speed in one direction by the rotation output of the rotation drive motor, a swing lever, A link mechanism is provided between the sleeve and a sleeve that is rotatably provided around the steam pipe. And a long cleaning nozzle. The nozzle is set to reciprocate once between the axial center position and the outermost peripheral position of the cylindrical heat exchanger when the swing lever is rotated once by the rotation drive motor. .

この際、ノズルは、定速で回転駆動される回転駆動モータの回転出力に従ってリンク機構により、熱交換器の軸心位置および最外周位置で揺動速度が０となり、これら軸心位置と最外周位置との中央位置で最大揺動速度となる、ほぼ正弦曲線状の速度変化で揺動動作されるようになっていた。すなわち、軸心位置と最外周位置の真ん中に、揺動速度の極大値発生位置が設定されていた。   At this time, the nozzle has a rocking speed of 0 at the axial center position and the outermost peripheral position of the heat exchanger by the link mechanism according to the rotational output of the rotational drive motor driven to rotate at a constant speed. The oscillating operation is performed with a substantially sinusoidal speed change that has a maximum oscillating speed at the center position. That is, the maximum value generation position of the swing speed is set in the middle between the axial center position and the outermost peripheral position.

特開平９−１３３４９５号公報JP-A-9-133495

しかし、軸心周りに回転駆動される熱交換器の回転周速度は、軸心位置で遅く、最外周位置で速いのに対し、定速の回転駆動モータで駆動されるノズルの揺動速度は、リンク機構との関係で、熱交換器の軸心位置と最外周位置の中央位置で最速となり、この中央位置でのノズルの動きが速すぎるために、当該中央位置周辺の清掃効率が良くないという課題があった。   However, the rotational speed of the heat exchanger driven to rotate around the axis is slow at the axial position and fast at the outermost peripheral position, whereas the oscillation speed of the nozzle driven by the constant speed rotational drive motor is Because of the relationship with the link mechanism, the center position of the heat exchanger is the fastest at the center position and the outermost peripheral position, and the nozzle moves too fast at this center position, so the cleaning efficiency around the center position is not good. There was a problem.

本発明は、上記従来の課題に鑑みて創案されたものであって、軸心周りに回転される熱交換器の半径方向中央位置周辺の清掃効率を向上することが可能なスートブロワ装置およびその運転方法を提供することを目的とする。   The present invention has been made in view of the above-described conventional problems, and is a soot blower device capable of improving the cleaning efficiency around the central position in the radial direction of a heat exchanger rotated around an axis, and the operation thereof. It aims to provide a method.

上記目的は、本発明の一局面によれば、一方向に回転する回転駆動モータの一回転で、軸心周りに回転駆動される筒体状の熱交換器の軸心位置と最外周位置との間を一回往復揺動されるとともに、これら軸心位置と最外周位置との間に揺動速度の極大値発生位置が設定された清掃手段を有するスートブロワ装置において、上記清掃手段の揺動速度の極大値発生位置を上記軸心位置近傍に設定するために、上記回転駆動モータの回転速度を変速させる変速手段を備えたことを特徴とするスートブロワ装置によって達成される。   According to one aspect of the present invention, the object is to provide an axial center position and an outermost peripheral position of a cylindrical heat exchanger that is rotationally driven around an axial center by one rotation of a rotational drive motor that rotates in one direction. In a soot blower device having a cleaning means in which a position where the maximum value of the swing speed is set is set between the axial center position and the outermost peripheral position. In order to set the maximum value generation position of the speed in the vicinity of the axial center position, this is achieved by a soot blower device provided with a speed change means for changing the rotation speed of the rotary drive motor.

上記変速手段は、上記清掃手段の揺動速度が上記熱交換器の上記軸心位置から上記最外周位置にわたる当該熱交換器の半径方向いずれの位置における回転周速度も超えないように、上記回転駆動モータの回転速度を変速させることを特徴とする。この変速手段として、インバータを用いるのが好ましい。   The transmission means rotates the rotation means so that the swing speed of the cleaning means does not exceed the rotational peripheral speed at any position in the radial direction of the heat exchanger from the axial center position of the heat exchanger to the outermost peripheral position. The rotational speed of the drive motor is changed. An inverter is preferably used as the speed change means.

また、上記目的は、本発明の別の局面によれば、一方向に回転する回転駆動モータの一回転で、軸心周りに回転駆動される筒体状の熱交換器の軸心位置と最外周位置との間を一回往復揺動されるとともに、これら軸心位置と最外周位置との間に揺動速度の極大値発生位置が設定された清掃手段を有するスートブロワ装置の運転方法において、上記清掃手段の揺動速度の極大値発生位置を上記軸心位置近傍に設定したことを特徴とするスートブロワ装置の運転方法によって達成される。   In addition, according to another aspect of the present invention, the above object is achieved by the axial position and the outermost position of the cylindrical heat exchanger that is driven to rotate around the axis by one rotation of the rotary drive motor that rotates in one direction. In the operation method of the soot blower device having a cleaning means that is reciprocally swung between the outer peripheral position and the axial position and the outermost peripheral position, and the maximum value generation position of the swing speed is set between This is achieved by the operation method of the soot blower device, wherein the position where the maximum value of the swing speed of the cleaning means is generated is set in the vicinity of the axial center position.

上記清掃手段の揺動速度が、前記熱交換器の上記軸心位置から上記最外周位置にわたる当該熱交換器の半径方向いずれの位置における回転周速度も超えないように設定したことを特徴とする。   The swinging speed of the cleaning means is set so as not to exceed the rotational peripheral speed at any position in the radial direction of the heat exchanger from the axial position of the heat exchanger to the outermost peripheral position. .

本発明のスートブロワ装置およびその運転方法によれば、軸心周りに回転される熱交換器の半径方向中央位置周辺の清掃効率を向上することができる。   According to the soot blower device and the operating method thereof of the present invention, it is possible to improve the cleaning efficiency around the central position in the radial direction of the heat exchanger rotated around the axis.

以下に、図面を参照して本発明のスートブロワ装置およびその運転方法の好適な一実施形態を詳細に説明する。本実施形態のスートブロワ装置１は、図１に示すように、一方向に連続的に回転する回転駆動モータ２と、回転駆動モータ２に接続され、その回転出力を減速させる減速機３と、減速機３に接続され、その回転出力で一方向に連続的に回転駆動されるスイングレバー４と、蒸気配管５周りに回転自在に設けられたスリーブ６と、スイングレバー４に一端が回転自在に連結された第１リンク部材７ａおよびスリーブ６に一端が接合され他端が第１リンク部材７ａの他端に回転自在に連結された第２リンク部材７ｂからなり、スイングレバー４の一方向連続回転運動でスリーブ６を反復往復回転運動させるリンク機構７と、スリーブ６に連結され、当該スリーブ６の反復往復回転運動で往復揺動運動されつつ、蒸気配管５から供給される蒸気を筒体状の熱交換器８に向かって噴出する清掃手段としての長尺なノズル９とから構成される。   Hereinafter, a preferred embodiment of a soot blower apparatus and an operation method thereof according to the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the soot blower device 1 of the present embodiment includes a rotary drive motor 2 that rotates continuously in one direction, a speed reducer 3 that is connected to the rotary drive motor 2 and decelerates the rotational output thereof, and a speed reducer. The swing lever 4 connected to the machine 3 and continuously driven to rotate in one direction by the rotation output thereof, the sleeve 6 rotatably provided around the steam pipe 5, and one end of the swing lever 4 are rotatably connected. One-way continuous rotational motion of the swing lever 4 comprising a second link member 7b having one end joined to the first link member 7a and the sleeve 6 and the other end rotatably connected to the other end of the first link member 7a. The link mechanism 7 for reciprocating the sleeve 6 in a reciprocating manner and the sleeve 6 are connected to the sleeve 6, and the steam supplied from the steam pipe 5 is reciprocated by the reciprocating reciprocating motion of the sleeve 6. Composed of long nozzles 9 serving as a cleaning means for ejecting toward the Jo heat exchanger 8.

さらに、回転駆動モータ２には、その出力回転速度を変化させる変速手段としてのインバータ１０が電源１１からの動力線の途中に設けられる。変速手段としては、インバータ１０に限らず、減速機などに組み込み得る機械式や油圧式等の変速機を採用することができる。   Further, the rotation drive motor 2 is provided with an inverter 10 as a speed change means for changing the output rotation speed in the middle of the power line from the power source 11. The speed change means is not limited to the inverter 10, and a mechanical or hydraulic speed changer that can be incorporated into a reduction gear or the like can be employed.

ノズル９は、背景技術と同様に、リンク機構７により、回転駆動モータ２で回転運動されるスイングレバー４の一回転で、軸心周りに回転駆動される筒体状熱交換器８の軸心位置Ｏと最外周位置Ｂとの間を一回往復揺動される。そして、ノズル９は、図２に示すように、リンク機構７の動作に従って、往復揺動運動の折り返し点である熱交換器８の軸心位置Ｏおよび最外周位置Ｂで速度０となり、これら軸心位置Ｏと最外周位置Ｂとの間で一つの極大値発生位置が現れる、正弦波形状の速度変化をもって揺動運動される。背景技術にあっては、図１および図２に示すように、これら軸心位置Ｏと最外周位置Ｂの中央位置Ａが極大値発生位置となっていた（図２中、実線Ｘが背景技術におけるノズルの揺動速度）。本実施形態にあっては、インバータ１０は、極大値発生位置Ｄが軸心位置Ｏ近傍となるように、回転駆動モータ２の一回転中における出力回転速度を変更するようになっている。これにより、軸心位置Ｏ近傍に設定された極大値発生位置Ｄと最外周位置Ｂとの間での回転駆動モータ２の出力回転速度が低速化され、これによりこの間におけるノズル９の揺動速度も低速化される（図２中、破線Ｙが本実施形態におけるノズル９の揺動速度）。   As in the background art, the nozzle 9 is rotated by the link mechanism 7 with the rotation of the swing drive motor 2 by one rotation of the swing lever 4 and rotated around the axis of the cylindrical heat exchanger 8. Between the position O and the outermost peripheral position B, it is reciprocated once. Then, as shown in FIG. 2, the nozzle 9 has a speed of 0 at the axial center position O and the outermost peripheral position B of the heat exchanger 8, which is the turning point of the reciprocating swing motion, according to the operation of the link mechanism 7. Oscillation is performed with a sinusoidal speed change in which one local maximum generation position appears between the center position O and the outermost peripheral position B. In the background art, as shown in FIGS. 1 and 2, the central position A of the axial center position O and the outermost peripheral position B is a local maximum generation position (in FIG. 2, the solid line X is the background art). Oscillating speed of the nozzle). In the present embodiment, the inverter 10 changes the output rotation speed during one rotation of the rotary drive motor 2 so that the maximum value generation position D is in the vicinity of the axial center position O. As a result, the output rotational speed of the rotary drive motor 2 between the local maximum position D and the outermost peripheral position B set in the vicinity of the axial center position O is reduced, and thereby the oscillation speed of the nozzle 9 during this period. (The broken line Y in FIG. 2 is the oscillation speed of the nozzle 9 in this embodiment).

また、本実施形態にあっては、ノズル９の揺動速度Ｙが、熱交換器８の軸心位置Ｏから最外周位置Ｂにわたる当該熱交換器８の半径方向いずれの位置における回転周速度（図２中、実線Ｚが熱交換器の回転周速度）も越えないように、インバータ１０により回転駆動モータ２の出力回転速度が設定される。すなわち、図２に示すように、揺動速度Ｙが極大値発生位置Ｄに達したノズル９が位置する熱交換器８の半径方向位置の回転周速度Ｚを、当該極大値が越えないように、インバータ１０により回転駆動モータ２の出力回転速度の変速が設定される。   Further, in the present embodiment, the rotational speed Y of the nozzle 9 is such that the rotational peripheral speed at any position in the radial direction of the heat exchanger 8 extending from the axial center position O of the heat exchanger 8 to the outermost peripheral position B (see FIG. In FIG. 2, the output rotational speed of the rotary drive motor 2 is set by the inverter 10 so that the solid line Z does not exceed the rotational peripheral speed of the heat exchanger. That is, as shown in FIG. 2, the maximum value does not exceed the rotational peripheral speed Z at the radial position of the heat exchanger 8 where the nozzle 9 where the swing speed Y reaches the maximum value generation position D is located. The inverter 10 sets the shift of the output rotational speed of the rotary drive motor 2.

次に、本実施形態のスートブロワ装置１の運転方法について説明すると、熱交換器８が軸心周りに回転駆動されるとともに、回転駆動モータ２が減速機３を介してスイングレバー４を一方向に連続回転運動させ、このスイングレバー４の連続回転運動により、リンク機構７はスリーブ６を連続反復揺動回転運動させる。連続反復揺動回転運動されるスリーブ６は、ノズル９を熱交換器８の軸心位置Ｏと最外周位置Ｂとの間で連続的に揺動運動させる。この際、インバータ１０は、ノズル９の揺動速度Ｙの極大値発生位置Ｄが熱交換器８の軸心位置Ｏ近傍となるように、回転駆動モータ２の一回転中における出力回転速度を変化させる。揺動速度Ｙの極大値発生位置Ｄを軸心位置Ｏ近傍に寄せることで、軸心位置Ｏ近傍に設定された極大値発生位置Ｄよりも熱交換器８外周側でのノズル９の揺動速度Ｙを低速化させることができる。   Next, the operation method of the soot blower device 1 of the present embodiment will be described. The heat exchanger 8 is driven to rotate around the axis, and the rotary drive motor 2 moves the swing lever 4 in one direction via the speed reducer 3. The link mechanism 7 causes the sleeve 6 to continuously rotate and rotate by the continuous rotation motion of the swing lever 4. The sleeve 6 that is continuously and repeatedly oscillated and rotated causes the nozzle 9 to oscillate continuously between the axial position O and the outermost peripheral position B of the heat exchanger 8. At this time, the inverter 10 changes the output rotation speed during one rotation of the rotary drive motor 2 so that the maximum value generation position D of the swing speed Y of the nozzle 9 is in the vicinity of the axial center position O of the heat exchanger 8. Let By moving the maximum value generation position D of the swing speed Y to the vicinity of the axial center position O, the nozzle 9 swings on the outer peripheral side of the heat exchanger 8 relative to the maximum value generation position D set near the axial center position O. The speed Y can be reduced.

好適には、インバータ１０により、回転駆動モータ２の出力回転速度を、ノズル９の揺動速度Ｙが、極大値発生位置Ｄに達したノズル９が位置する熱交換器８の半径方向位置の回転周速度Ｚを越えないように設定することで、ノズル９の揺動速度Ｙを熱交換器８の半径方向いずれの位置における回転周速度Ｚよりも相対的に小さくすることができる。   Preferably, the output rotation speed of the rotary drive motor 2 is rotated by the inverter 10 at the position in the radial direction of the heat exchanger 8 where the nozzle 9 is located where the swing speed Y of the nozzle 9 reaches the maximum value generation position D. By setting so as not to exceed the peripheral speed Z, the swing speed Y of the nozzle 9 can be made relatively smaller than the rotational peripheral speed Z at any position in the radial direction of the heat exchanger 8.

以上説明したように、本実施形態のスートブロワ装置１およびその運転方法によれば、リンク機構７に基づいて回転駆動される熱交換器８の軸心位置Ｏと最外周位置Ｂとの間に揺動速度の極大値発生位置が設定されたノズル９の揺動速度Ｙを、インバータ１０を用いて回転駆動モータ２の一回転中における出力回転速度を変速して当該極大値発生位置Ｄを軸心位置Ｏ近傍に設定するようにしたので、従来のように定速で回転駆動される回転駆動モータによって設定されて熱交換器８の中央位置Ａで極大値を迎えるノズルの揺動速度Ｘに比べて、回転駆動される熱交換器８の軸心位置Ｏと最外周位置Ｂとの間の中央位置Ａにおけるノズル９の揺動速度Ｙを低速化することができ、熱交換器８の中央位置Ａの清掃効率を適切に向上することができる。   As described above, according to the soot blower device 1 and the operation method thereof according to the present embodiment, the rocking motion is performed between the axial center position O and the outermost peripheral position B of the heat exchanger 8 that is rotationally driven based on the link mechanism 7. The oscillation speed Y of the nozzle 9 where the maximum value generation position of the dynamic speed is set is changed using the inverter 10 to change the output rotation speed during one rotation of the rotary drive motor 2, and the maximum value generation position D is centered. Since it is set in the vicinity of the position O, it is set by a rotational drive motor that is rotationally driven at a constant speed as in the prior art, and compared with the oscillation speed X of the nozzle that reaches the maximum value at the central position A of the heat exchanger 8. Thus, the swing speed Y of the nozzle 9 at the center position A between the axial center position O and the outermost peripheral position B of the heat exchanger 8 that is rotationally driven can be reduced, and the center position of the heat exchanger 8 can be reduced. A cleaning efficiency of A can be improved appropriately .

また、インバータ１０による回転駆動モータ２の出力回転速度の設定により、ノズル９の揺動速度Ｙを、熱交換器８の軸心位置Ｏから最外周位置Ｂにわたる当該熱交換器８の半径方向いずれの位置における回転周速度Ｚも超えないように設定したので、揺動速度Ｙの極大値発生位置Ｄを軸心位置Ｏ近傍に設定したことと相俟って、適切にノズル９の揺動速度Ｙの低速化を達成して熱交換器８の清掃効率向上を図ることができる。   Further, by setting the output rotational speed of the rotary drive motor 2 by the inverter 10, the swing speed Y of the nozzle 9 is changed in any radial direction of the heat exchanger 8 from the axial center position O to the outermost peripheral position B of the heat exchanger 8. Since the rotational peripheral speed Z at the position is set so as not to exceed, the maximum speed generation position D of the swing speed Y is set in the vicinity of the axial center position O, and the swing speed of the nozzle 9 is appropriately set. The reduction in Y speed can be achieved and the cleaning efficiency of the heat exchanger 8 can be improved.

また、変速手段をインバータ１０を用いて構成することにより、きわめて簡単にノズル９の揺動速度Ｙを変更したり調整したりすることができる。なお、インバータ１０を用いたノズル９の揺動速度Ｙは、例えばスイングレバー４の1回転における適当な位置にスイングレバー４の位置検出手段を設けて、その位置検出結果をインバータ10
に入力することによっても可変、調整することができる。 Further, by configuring the speed change means using the inverter 10, the swing speed Y of the nozzle 9 can be changed or adjusted very easily. For the swing speed Y of the nozzle 9 using the inverter 10, for example, the position detection means of the swing lever 4 is provided at an appropriate position in one rotation of the swing lever 4, and the position detection result is converted into the inverter 10
It is also possible to change and adjust by inputting to.

本発明にかかるスートブロワ装置の好適な一実施形態を示す構成図である。It is a block diagram which shows suitable one Embodiment of the soot blower apparatus concerning this invention. 本発明にかかるスートブロワ装置の運転方法の好適な一実施形態を説明するための、熱交換器の半径方向位置におけるノズルの揺動速度および熱交換器の回転周速度の関係を示すグラフ図である。It is a graph which shows the relationship of the rocking | fluctuation speed of the nozzle in the radial direction position of a heat exchanger, and the rotational peripheral speed of a heat exchanger for describing suitable one Embodiment of the operation method of the soot blower apparatus concerning this invention. .

符号の説明Explanation of symbols

１ スートブロワ装置
２ 回転駆動モータ
８ 熱交換器
９ ノズル
１０ インバータ
Ｏ 熱交換器の軸心位置
Ｂ 熱交換器の最外周位置
Ｄ 揺動速度の極大値発生位置
Ｙ ノズルの揺動速度
Ｚ 熱交換器の回転周速度 DESCRIPTION OF SYMBOLS 1 Soot blower apparatus 2 Rotation drive motor 8 Heat exchanger 9 Nozzle 10 Inverter O The axial center position of a heat exchanger B The outermost peripheral position of a heat exchanger D The position where the maximum value of the swing speed is generated Y The swing speed of the nozzle Z The heat exchanger Rotational peripheral speed

Claims (3)

一方向に回転する回転駆動モータの一回転で、軸心周りに回転駆動される筒体状の熱交換器の軸心位置と最外周位置との間を一回往復揺動されるとともに、これら軸心位置と最外周位置との間に揺動速度の極大値発生位置が設定された清掃手段を有するスートブロワ装置において、
上記清掃手段の揺動速度が前記熱交換器の上記軸心位置から上記最外周位置にわたる当該熱交換器の半径方向いずれの位置における回転周速度をも超えず、かつその極大値発生位置を上記軸心位置近傍に設定するように、前記回転駆動モータの回転速度を変速させる変速手段を備えたことを特徴とするスートブロワ装置。 In one rotation of the rotary drive motor that rotates in one direction, the cylindrical heat exchanger that is driven to rotate around the axis is reciprocated once between the axial center position and the outermost peripheral position. In the soot blower device having the cleaning means in which the maximum value generation position of the swing speed is set between the shaft center position and the outermost peripheral position,
The swing speed of the cleaning means does not exceed the rotational peripheral speed at any position in the radial direction of the heat exchanger from the axial center position of the heat exchanger to the outermost peripheral position, and the maximum value generation position is A soot blower device comprising a speed change means for changing a rotation speed of the rotary drive motor so as to be set in the vicinity of an axial center position. 前記変速手段がインバータであることを特徴とする請求項１に記載のスートブロワ装置。 The soot blower device according to claim 1 , wherein the transmission means is an inverter. 一方向に回転する回転駆動モータの一回転で、軸心周りに回転駆動される筒体状の熱交換器の軸心位置と最外周位置との間を一回往復揺動されるとともに、これら軸心位置と最外周位置との間に揺動速度の極大値発生位置が設定された清掃手段を有するスートブロワ装置の運転方法において、
上記清掃手段の揺動速度が、前記熱交換器の前記軸心位置から前記最外周位置にわたる当該熱交換器の半径方向いずれの位置における回転周速度をも超えず、かつその極大値発生位置を上記軸心位置近傍に設定したことを特徴とするスートブロワ装置の運転方法。 In one rotation of the rotary drive motor that rotates in one direction, the cylindrical heat exchanger that is driven to rotate around the axis is reciprocated once between the axial center position and the outermost peripheral position. In the operation method of the soot blower device having the cleaning means in which the maximum value generation position of the swing speed is set between the shaft center position and the outermost peripheral position,
Rocking speed of the cleaning means, said shaft from said heart position without even exceed peripheral speed in the radial direction any position of the heat exchanger over the outermost position, the maximum value generation position of Katsuso of the heat exchanger Is set in the vicinity of the axial center position.
JP2007012039A 2007-01-22 2007-01-22 Soot blower device and operation method thereof Expired - Fee Related JP4786560B2 (en)

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US20110005706A1 (en) * 2009-07-08 2011-01-13 Breen Energy Solutions Method for Online Cleaning of Air Preheaters

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JPH0735497A (en) * 1993-07-23 1995-02-07 Japan Maintenance:Kk Cleaner for rotary heat exchanger
JPH09133495A (en) * 1995-11-06 1997-05-20 Mitsubishi Heavy Ind Ltd Rotating regenerative heat exchanger
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