JPH02178594A - Discharged gas processing device for arc furnace - Google Patents
Discharged gas processing device for arc furnaceInfo
- Publication number
- JPH02178594A JPH02178594A JP33415688A JP33415688A JPH02178594A JP H02178594 A JPH02178594 A JP H02178594A JP 33415688 A JP33415688 A JP 33415688A JP 33415688 A JP33415688 A JP 33415688A JP H02178594 A JPH02178594 A JP H02178594A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- sub
- suction system
- arc furnace
- discharged gas
- 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.)
- Granted
Links
Landscapes
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明はアーク炉から発生する排ガスの処理装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an apparatus for treating exhaust gas generated from an arc furnace.
金属材料の溶解にアーク炉が広く利用されているが、該
アーク炉からは、金属材料をアーク熱により溶解する性
質上、高温の排ガスが発生する。Although arc furnaces are widely used for melting metal materials, high-temperature exhaust gas is generated from the arc furnace due to the nature of melting the metal materials using arc heat.
該排ガスは、アーク炉の環境（建屋、中間／＼ラウス）
から間接的に吸引する主吸引系統と該アーク炉から直接
吸引する副吸引系統とを介し、両系統の合流後に装備さ
れた主吸引ファンで吸引され最終的には集塵装置で処理
された後に大気中へ放出される。The exhaust gas is the environment of the arc furnace (building, intermediate/\Rous)
Through the main suction system that draws air indirectly from the arc furnace and the sub-suction system that draws directly from the arc furnace, after the two systems join, it is sucked in by the main suction fan installed, and finally processed by the dust collector. Released into the atmosphere.
本発明は、上記のような排ガスの処理において、該排ガ
スを全体として効率的に且つ経済的に処理することがで
きる装置に関するものである。The present invention relates to an apparatus that can process the exhaust gas as a whole efficiently and economically in the treatment of the exhaust gas as described above.
〈従来の技術、その課題〉
従来、アーク炉から発生する排ガスの処理装置として一
般に、該排ガスを主吸引系統と副吸引系統とを介し両系
統の合流後に装備された主吸引ファンで吸引しつつ集塵
装置で処理する装置が使用されている。<Prior art and its problems> Conventionally, as a treatment device for exhaust gas generated from an arc furnace, the exhaust gas is generally sucked through a main suction system and a sub-suction system with a main suction fan installed after the two systems join together. A device that uses a dust collector is used.
ところが、この従来装置には、排ガスの処理が全体とし
て非効率的且つ非経済的に過ぎるという課題がある０通
常、主吸引系統における排ガスの風量は比較的大きいが
、その配管抵抗は比較的小さく、したがって風圧は比較
的小さい。逆に、副吸引系統における排ガスの風量は比
較的小さいが、その配管抵抗は比較的大きく、したがっ
て風圧は比較的大きい０両系統の排ガスをその合流後に
装備された主吸引ファンでのみ吸引しようとすると、該
主吸引ファンは、両系統の排ガスの風量及び風圧を合わ
せた能力のものとしなければならず七の結果、該主吸引
ファンは風量及び風圧の双方ともに大きなものを稼動さ
せることになってしまうからである。However, this conventional device has the problem that the exhaust gas treatment as a whole is too inefficient and uneconomical.Normally, the air volume of exhaust gas in the main suction system is relatively large, but the piping resistance is relatively small. , so the wind pressure is relatively small. On the other hand, although the air volume of exhaust gas in the sub-suction system is relatively small, the piping resistance is relatively large, so the wind pressure is relatively large. Then, the main suction fan must have a capacity that combines the air volume and wind pressure of the exhaust gas of both systems, and as a result, the main suction fan has to operate with a large air volume and wind pressure. This is because
そこで従来、アーク炉から発生する排ガスの処理装置と
して、該排ガスの吸引を、主吸引系統と副吸引系統の合
流後に装備された主吸引ファンだけではなく、副吸引系
統に装備された副吸引ファンでも行なう装置が提案され
ている（実公昭５２２６１９８号公報）。この従来装置
は、副吸弓系統における排カスの吸引に必要とされる風
圧と主吸引系統における排ガスの吸引に必要とされる風
圧との間の差圧を、副吸引ファンにより補い、よって主
吸引ファンに必要とされる主に風圧を軽減して、排ガス
の処理をより経済的に行なうものである。Conventionally, as a treatment device for the exhaust gas generated from an arc furnace, suction of the exhaust gas is performed not only by a main suction fan installed after the main suction system and the sub-suction system join, but also by a sub-suction fan installed in the sub-suction system. A device has also been proposed (Japanese Utility Model Publication No. 5226198). This conventional device uses a sub-suction fan to compensate for the differential pressure between the wind pressure required for suction of waste gas in the sub-suction system and the wind pressure required for suction of exhaust gas in the main suction system. This mainly reduces the wind pressure required by the suction fan, making exhaust gas treatment more economical.
ところが、この従来装置にも依然として、排ガスの処理
が全体としてなお非効率的且つ非経済的であるという課
題がある。アーク炉から発生する排ガスの風量は該アー
ク炉の操業段階に応して大きく変動するのであるが、主
吸引ファンを常時−定稼動させる従来装置では、主吸引
ファンを、実際には排ガスのＸＩが小さいときでも、該
υ１ガスの風量が最大のときに見合う高速で回転させる
ことになってしまうからである。However, this conventional device still has the problem that the treatment of exhaust gas as a whole is still inefficient and uneconomical. The volume of exhaust gas generated from an arc furnace varies greatly depending on the operating stage of the arc furnace.However, in conventional devices that operate the main suction fan constantly, the main suction fan is actually This is because even when υ1 gas is small, the rotation is performed at a high speed corresponding to when the air volume of the υ1 gas is maximum.
〈発明が解決しようとする課題、その解決Ｆ段〉本発明
は叙上の如き従来の課題を解決する改良された排ガスの
処理装置を提供するものである。<Problems to be Solved by the Invention, Step F of Solving the Problems> The present invention provides an improved exhaust gas treatment device that solves the conventional problems as described above.
しかして本発明は、
アーク炉から発生する排ガスを、該アーク炉の環境から
間接的に吸引する主吸引系統と該アーク炉から直接吸引
する副吸引系統とを介し、両系統の合流後に装備された
主吸引ファンで吸引しつつ集塵装置で処理する装置にお
いて、主吸引ファンの回転数が排ガスの風量及び温度を
制御因子として制御されており、併せてこの制御下にお
いて副吸引系統に、主吸引系統の排ガスを吸引するに必
要とされる風圧と副吸引系統の排ガスを吸引するに必要
とされる風圧との間の最大差圧を補う副吸引ファンが装
備されて成ることを特徴とする排ガスの処理袋めに係る
。Therefore, the present invention is equipped with a main suction system that sucks exhaust gas generated from an arc furnace indirectly from the environment of the arc furnace, and a sub suction system that sucks it directly from the arc furnace, after the two systems join together. In a device that processes suction with a main suction fan and processes it with a dust collector, the rotation speed of the main suction fan is controlled using the air volume and temperature of the exhaust gas as control factors, and under this control, the main suction system is It is characterized by being equipped with an auxiliary suction fan that compensates for the maximum differential pressure between the wind pressure required to suction the exhaust gas of the suction system and the wind pressure required to suction the exhaust gas of the auxiliary suction system. Concerning waste gas processing bags.
本発明において肝要な点は、第一に、排ガスの風量及び
温度を制御因子として主吸引ファンの回転数を制御する
処にある。該主吸引ファンは、排カスのＸ［’ｒが最大
のときに見合う能力を有するものであるが１例えばアー
ク炉の操業段階に応じて設定される排ガスの風量だけを
制御因子にすると、高温の排ガスか集塵装置へ吸引され
て、該集塵装置のフィルタメディア等を損ない、また二
次公害を引き起こすことがあるからである。アーク炉の
原料籾袋、原料連装或は出鋼段階では、主吸弓系統へ吸
引されることとなる排ガスの風量は太きいが、副吸引系
統へ吸引されることとなる排カスの風量は極めて小さく
、そして全体としては排カスのに量は大きいが温度は低
い。逆に、アーク炉の溶解段階では、上記の原料籾袋、
原料連装或は出鋼段階に比べ、主吸引系統へ吸引される
こととなる排ガスの風量は小さいが、副吸引系統へ吸引
されることとなる排ガスの風量は大きく、全体としては
排ガスの風量は小さいが温度は高い。したがって、アー
ク炉の溶解段階において排ガスの風量だけを制御因子と
して主吸引ファンの回転数を少なくすると、高温の排ガ
スが集塵装置へ吸引されてしまうのである。本発明は、
排ガスの風量及び温度を制御因子として、温度について
は例えば１１０°Ｃを一ヒ限として、主吸引ファンの回
転数を制御するものである。The important point in the present invention is, first, that the rotation speed of the main suction fan is controlled using the air volume and temperature of the exhaust gas as control factors. The main suction fan has a capacity that corresponds to the maximum X['r of the exhaust gas. This is because the exhaust gas may be sucked into the dust collector, damaging the filter media of the dust collector, and causing secondary pollution. At the raw material paddy bag, raw material loading, or tapping stage of an arc furnace, the air volume of exhaust gas that is sucked into the main suction system is large, but the air volume of exhaust gas that is sucked into the sub suction system is large. Although it is extremely small and the amount of waste is large overall, the temperature is low. On the contrary, in the melting stage of the arc furnace, the above raw material paddy bags,
Compared to the raw material loading or tapping stage, the air volume of the exhaust gas that is sucked into the main suction system is small, but the air volume of the exhaust gas that is sucked into the sub-suction system is large, and the overall air volume of the exhaust gas is Although it is small, the temperature is high. Therefore, if the number of rotations of the main suction fan is reduced in the melting stage of the arc furnace using only the air volume of the exhaust gas as a control factor, the high-temperature exhaust gas will be sucked into the dust collector. The present invention
The number of rotations of the main suction fan is controlled using the air volume and temperature of the exhaust gas as control factors, with the temperature being limited to, for example, 110°C.
本発明において肝要な点は、第二に、上記のような主吸
引ファンの回転数制御下において、副吸引系統に、該副
吸引系統の排ガスを吸引するに必要とされる風圧と主吸
引系統の排ガスを吸引するに必要とされる風圧との間の
最大差圧を補う副吸引ファンを装備する処にある。主吸
引ファンの回転数を制御することなく、従来装置のよう
に主吸引ファンを常時最大回転数で稼動させる場合でも
、副吸引系統に装備される副吸引ファンには、副吸引系
統における排ガスの風圧と主吸引系統における排ガスの
風圧との間の差圧を補うことが通常必要となる。従来装
置では、このような差圧を補う副吸引ファンを副吸引系
統に装備すればよいのである。しかし、主吸引ファンの
回転数を前述したように制御すると、副吸引系統におけ
る排ガスの風圧と主吸引系統における排ガスの風圧との
間の最大差圧は、上記従来装置の場合よりも大きくなる
。主吸引ファンの回転数を前述したように制御すると、
従来装置の場合と同じ副吸引ファンでは該副吸引ファン
が本来の機能すなわち、渭吸引系統における排ガスの風
圧と主吸引系統における排ガスの風圧との間の差圧を補
うという機能を完全に果たすことができなくなってしま
うのである。The second important point in the present invention is that, under the rotational speed control of the main suction fan as described above, the wind pressure required to suck the exhaust gas from the sub suction system and the main suction system It is equipped with an auxiliary suction fan that compensates for the maximum differential pressure between the wind pressure and the wind pressure required to suck in the exhaust gas. Even when the main suction fan is always operated at the maximum rotation speed like in conventional equipment without controlling the rotation speed of the main suction fan, the sub suction fan installed in the sub suction system is It is usually necessary to compensate for the differential pressure between the wind pressure and the wind pressure of the exhaust gas in the main suction system. In the conventional device, it is sufficient to equip the sub-suction system with a sub-suction fan to compensate for such a pressure difference. However, when the rotational speed of the main suction fan is controlled as described above, the maximum differential pressure between the exhaust gas wind pressure in the sub suction system and the exhaust gas wind pressure in the main suction system becomes larger than in the case of the conventional device. If the rotation speed of the main suction fan is controlled as described above,
With the same sub-suction fan as in the case of the conventional device, the sub-suction fan completely fulfills its original function, that is, the function of compensating for the differential pressure between the wind pressure of the exhaust gas in the side suction system and the wind pressure of the exhaust gas in the main suction system. This makes it impossible to do so.
本発明は、前述したような主吸引ファンの回転数制御下
において、副吸引系統における排ガスの風圧と主吸引系
統における排ガスの風圧との間の最大差圧を補う副吸引
ファン、すなわち従来装置の場合よりも余裕を持たせた
副吸引ファンを副吸引系統に装備するものである。The present invention provides a sub-suction fan that compensates for the maximum differential pressure between the wind pressure of exhaust gas in the sub-suction system and the wind pressure of exhaust gas in the main suction system under the control of the rotation speed of the main suction fan as described above. The auxiliary suction system is equipped with a auxiliary suction fan that has more leeway than the case.
以下、図面に・基いて本発明の構成を更に詳細に説明す
る。Hereinafter, the configuration of the present invention will be explained in more detail based on the drawings.
〈実施例〉 第１図は本発明の−・実施例を示す全体略視図である。<Example> FIG. 1 is an overall schematic diagram showing an embodiment of the present invention.
アーク炉１１の建ｇ； １２に該ア〜り炉１１から発生
する排ガスを間接的に吸引する主吸引系統２１が接続さ
れており、またアーク炉１１には該アーク炉１１から発
生する排ガスを直接吸引する副吸引系統２２が接続され
ていて１両系統はその下流側で合流している。副吸引系
統２２には、該副吸引系統２２における排ガスの風圧と
主吸弓系統２１における排ガスの風圧との間の差圧を補
う副吸引ファン３２が装備されており、主吸引系統２工
と副吸引系統２２との合流後における排ガス吸引系統２
３には主吸引ファン３１が装備されていて、更に該主吸
引ファン３１の下流側に集塵袋２１４１が装備されてい
る。A main suction system 21 that indirectly sucks the exhaust gas generated from the arc furnace 11 is connected to the construction 12 of the arc furnace 11; A sub-suction system 22 for direct suction is connected, and both systems merge on the downstream side thereof. The sub-suction system 22 is equipped with a sub-suction fan 32 that compensates for the differential pressure between the wind pressure of the exhaust gas in the sub-suction system 22 and the wind pressure of the exhaust gas in the main suction system 21. Exhaust gas suction system 2 after merging with the sub suction system 22
3 is equipped with a main suction fan 31, and further equipped with a dust collection bag 2141 on the downstream side of the main suction fan 31.
第１図において、主吸引ファン３１は、アーク炉１１か
ら発生する排ガスの風量に応じて、すなわち該排ガスの
Ｘ敬に密接な関係を有するアーク炉１１からの各操業段
階に応じて発せられる信号によって制御装置５１を介し
その回転数が制御されており、同時に、主吸引ファン３
１の上流側の排ガス吸引系、絖２３における排ガスの温
度を検知する温度計５２から発せられる信号により制御
装置５１を介しその回転数が制御されている。In FIG. 1, the main suction fan 31 generates a signal according to the flow rate of the exhaust gas generated from the arc furnace 11, that is, according to each operating stage from the arc furnace 11, which has a close relationship with the exhaust gas. The rotation speed of the main suction fan 3 is controlled via the control device 51, and at the same time, the main suction fan 3
The rotation speed of the exhaust gas suction system on the upstream side of the exhaust gas suction system 1 is controlled via a control device 51 based on a signal emitted from a thermometer 52 that detects the temperature of exhaust gas in the wire 23.
アーク炉１１の溶解段階において、建屋１２内に発生す
る排ガスの風量はアーク炉１１の原料切裂、原料迫装成
は出鋼段階に比べてＣ以下、相対的と略記する）小さい
が、逆にアーク炉ｌｌ内に発生する排ガスの風量は相対
的に大きくその温度が高い、したがって、主吸引系統２
１や副吸引系統２２を介し排ガス吸引系統２３に吸引さ
れる全体としての排ガスの風量は相対的に小さくその温
度が高くなる。この場合、アーク炉１１から発生する排
ガスの風量に応じて制御袋ご５１を介し主吸引ファン３
１の回転数を制御すると、その回転数は相対的に少なく
、高温の排ガスが集塵装置４１へ吸引されて、該集塵装
置４１のフィルタメディアを損なったり、また二次公害
を引き起こしてしまう。そこで、排ガス吸引系統２３に
おける排ガスの温度を温度計５２で検知して、その温度
が例えば１１０℃を超えるときには、該１１Ｏ℃を上限
として（上限温度は集塵装置４１のフィルタメディアの
素材との関係で設定される）、該排ガスの温度が１１０
″Ｃ以下となるように制御装置５１を介し主吸引ファン
３１の回転数を多くする。During the melting stage of the arc furnace 11, the air volume of the exhaust gas generated in the building 12 is smaller than that of the raw material cutting and raw material pressing stage of the arc furnace 11 (compared to the tapping stage (abbreviated as "relative")), but the opposite is true. The air volume of the exhaust gas generated in the arc furnace II is relatively large and its temperature is high, so the main suction system 2
1 and the sub suction system 22 to the exhaust gas suction system 23 as a whole, the air volume of the exhaust gas as a whole is relatively small and its temperature becomes high. In this case, depending on the air volume of exhaust gas generated from the arc furnace 11, the main suction fan 3 is
1, the rotation speed is relatively low, and high-temperature exhaust gas is sucked into the dust collector 41, damaging the filter media of the dust collector 41 and causing secondary pollution. . Therefore, when the temperature of the exhaust gas in the exhaust gas suction system 23 is detected by the thermometer 52 and the temperature exceeds, for example, 110°C, the upper limit temperature is set to 110°C (the upper limit temperature is the same as the material of the filter media of the dust collector 41). ), the temperature of the exhaust gas is 110
The number of rotations of the main suction fan 31 is increased via the control device 51 so that the rotation speed becomes less than ``C''.
発生する排ガスの風量に優先して排ガスの温度がｍＶＢ
因子として機能するのである。そしてこの際、それでも
なお主吸引系統２１に吸引される排ガスの風量は相対的
に小さく、風圧も相対的に小さいが、副吸引系統３２に
吸引される排ガスの風量は相対的に大きく、風圧も大き
い。したがって、両系統の間の差圧は相対的に大きいの
で、このような大きい差圧を補うだけの余裕を持った副
吸引ファン３２を副吸引系統２２に装備しているのであ
る。The temperature of the exhaust gas takes priority over the air volume of the generated exhaust gas.
It functions as a factor. At this time, the air volume of the exhaust gas sucked into the main suction system 21 is still relatively small, and the wind pressure is also relatively small, but the air volume of the exhaust gas sucked into the sub suction system 32 is relatively large, and the wind pressure is also relatively small. big. Therefore, since the pressure difference between the two systems is relatively large, the sub-suction fan 32 is equipped with the sub-suction fan 32 which has enough margin to compensate for such a large pressure difference.
〈発明の効果〉
以り説明した通りであるから、本発明には、アーク炉か
ら発生する排ガスを全体として効率的に且つ経済的に処
理することができるという効果がある。<Effects of the Invention> As explained above, the present invention has the effect that the exhaust gas generated from the arc furnace can be treated efficiently and economically as a whole.
第１図は本発明の一実施例を示す全体略視図である。
１１・・・・アーク炉、１２・・・・建Ｅ１２１・・・
・主吸引系統、２２・・・・副吸引系統３１・・・・主
吸引ファン、３２・・・・副吸引ファン４１・・・・集
塵装置、５１・・・・制御装置５２・・・・温度計
特許出願人 大同特殊鋼株式会社
代理人 弁理士 入 山 宏 正FIG. 1 is an overall schematic diagram showing an embodiment of the present invention. 11...Arc furnace, 12...E121...
-Main suction system, 22...Sub suction system 31...Main suction fan, 32...Sub suction fan 41...Dust collector, 51...Control device 52...・Thermometer patent applicant Daido Steel Co., Ltd. Agent Patent attorney Hiromasa Iriyama
Claims (1)
から間接的に吸引する主吸引系統と該アーク炉から直接
吸引する副吸引系統とを介し、両系統の合流後に装備さ
れた主吸引ファンで吸引しつつ集塵装置で処理する装置
において、主吸引ファンの回転数が排ガスの風量及び温
度を制御因子として制御されており、併せてこの制御下
において副吸引系統に、主吸引系統の排ガスを吸引する
に必要とされる風圧と副吸引系統の排ガスを吸引するに
必要とされる風圧との間の最大差圧を補う副吸引ファン
が装備されて成ることを特徴とする排ガスの処理装置。1. A main suction fan installed after the merging of both systems, through a main suction system that indirectly sucks the exhaust gas generated from the arc furnace from the environment of the arc furnace and a sub suction system that sucks it directly from the arc furnace. In a device that processes dust with a dust collector while suctioning, the rotation speed of the main suction fan is controlled using the air volume and temperature of the exhaust gas as control factors, and under this control, the exhaust gas from the main suction system is transferred to the sub-suction system. An exhaust gas processing device characterized in that it is equipped with a sub-suction fan that compensates for the maximum differential pressure between the wind pressure required to suction the exhaust gas and the wind pressure required to suction the exhaust gas of the sub-suction system. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63334156A JP2737192B2 (en) | 1988-12-29 | 1988-12-29 | Exhaust gas generated from arc furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63334156A JP2737192B2 (en) | 1988-12-29 | 1988-12-29 | Exhaust gas generated from arc furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02178594A true JPH02178594A (en) | 1990-07-11 |
| JP2737192B2 JP2737192B2 (en) | 1998-04-08 |
Family
ID=18274162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63334156A Expired - Fee Related JP2737192B2 (en) | 1988-12-29 | 1988-12-29 | Exhaust gas generated from arc furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2737192B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5845663A (en) * | 1996-03-13 | 1998-12-08 | Lg Semicon Co., Ltd. | Wafer wet processing device |
| CN103353238A (en) * | 2013-07-09 | 2013-10-16 | 曲沃县民政福利企业有限公司 | Multistation multi-angle dust remover front end device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101277745B1 (en) * | 2011-07-28 | 2013-06-24 | 현대제철 주식회사 | Apparatus for recovering Lintz Donawitz Gas and Method for recovering Lintz Donawitz Gas |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5929700U (en) * | 1982-08-16 | 1984-02-24 | トピ−工業株式会社 | Exhaust gas white smoke extinguisher for scrap preheating equipment |
-
1988
- 1988-12-29 JP JP63334156A patent/JP2737192B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5929700U (en) * | 1982-08-16 | 1984-02-24 | トピ−工業株式会社 | Exhaust gas white smoke extinguisher for scrap preheating equipment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5845663A (en) * | 1996-03-13 | 1998-12-08 | Lg Semicon Co., Ltd. | Wafer wet processing device |
| CN103353238A (en) * | 2013-07-09 | 2013-10-16 | 曲沃县民政福利企业有限公司 | Multistation multi-angle dust remover front end device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2737192B2 (en) | 1998-04-08 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |