JP2005241211A - Method for preventing dew condensation in piping - Google Patents

Method for preventing dew condensation in piping Download PDF

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JP2005241211A
JP2005241211A JP2004054209A JP2004054209A JP2005241211A JP 2005241211 A JP2005241211 A JP 2005241211A JP 2004054209 A JP2004054209 A JP 2004054209A JP 2004054209 A JP2004054209 A JP 2004054209A JP 2005241211 A JP2005241211 A JP 2005241211A
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temperature
pipe
water
piping
air
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JP4350554B2 (en
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Yoshio Yuno
与志雄 油納
Takayuki Uchida
隆之 内田
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Nihon Spindle Manufacturing Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for preventing dew condensation in piping capable of increasing a service life of a piping or the like by reducing in-duct corrosion due to dew condensation during operation outage. <P>SOLUTION: In a system sucking in exhaust gas exhausted from an electric furnace 1, passing it through a piping duct or the like of a double structure water jacket type, treating it into normal air by a dust collector, and then exhausting it out into the atmosphere, during system outage, hot water that is hotter than an in-piping air temperature is supplied into a jacket J. Temperature of the water to be sent to the jacket J is controlled by an impression signal from a temperature detector detecting the in-piping air temperature. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、電気炉から排出される排ガスを直接吸引し、集塵機で正常空気に処理した後大気中に排出するシステムの配管経路に用いられる水冷ダクトやガスクーラーの内面に発生する、システム停止時の結露を防止する方法に関するものである。   The present invention directly sucks exhaust gas discharged from an electric furnace, treats it to normal air with a dust collector, and then discharges it into the atmosphere, and then occurs on the inner surface of a water-cooled duct or gas cooler used in the piping path of the system. It is related with the method of preventing dew condensation.

従来、電気炉から発生する塵埃等を含む排ガス（以下、単に「排ガス」という。）を直接吸引し、集塵機で正常空気に処理した後大気中に排出するシステムは、図４に示すように電気炉１から排出される１４００〜１５００℃程度の排ガスを通す燃焼塔２や水冷ダクト３を含む配管ダクトに二重構造のジャケット方式（図４において、破線で示す。）を採用し、該ジャケットＪ内に冷却水温調器によって調整された冷却水を流出コック７から流入コック８を循環させることによって高温の排ガスを集塵機５に入る際には４００℃（好ましくは２５０℃程度）以下に冷却するようにしている。
図例、流出コック７からの流出と流入コック８への流入経路は２系統の例を示すが電気炉１に備わる排出管１ａ等にも接続するように構成される場合もある。 Conventionally, a system that directly sucks exhaust gas containing dust generated from an electric furnace (hereinafter simply referred to as “exhaust gas”), processes it into normal air with a dust collector, and discharges it into the atmosphere as shown in FIG. A double jacket system (shown by a broken line in FIG. 4) is adopted for the piping duct including the combustion tower 2 and the water cooling duct 3 through which the exhaust gas of about 1400 to 1500 ° C. discharged from the furnace 1 passes. The cooling water adjusted by the cooling water temperature controller is circulated from the outflow cock 7 to the inflow cock 8 so that the hot exhaust gas is cooled to 400 ° C. (preferably about 250 ° C.) or less when entering the dust collector 5. I have to.
In the illustrated example, the outflow from the outflow cock 7 and the inflow path to the inflow cock 8 are shown in two systems, but may be configured to be connected to the discharge pipe 1a provided in the electric furnace 1 or the like.

しかし、運転休止中の配管ダクトに対して何らかの処置が施されることはなかった。
これは、従前の電気炉から排出される排ガス成分によっては多少の結露が生じたとしても腐食は少なく、また、運転の停止時間も長いものではなかったためであり、近年電気炉に投入する原料の変化により塩素分を含む材料が増えるとともに、操業コストを考慮し電気炉の昼間の運転が停止されるケースが多くなってきた。 However, no measures were taken for the piping ducts that were out of service.
This is because, depending on the exhaust gas components discharged from the conventional electric furnace, even if some condensation occurs, the corrosion is small and the operation stop time is not long. Due to the change, the number of materials containing chlorine has increased, and the operation of electric furnaces in the daytime has been stopped in consideration of operating costs.

また、ジャケット内の水は運転中において内部に空気が存在することは許されず、停止中において水を抜き去ると、運転再開時に気抜き作業に多大の手数を要するため停止中もジャケット内部に水を滞留させる必要があり、停止直後は３０℃程度ある冷却水温度も時間の経過とともに低下し、配管内空気温度を下回ることとなり特に配管内空気温度が冷却水温度より高い時期には配管内部に結露が発生し易くなる。   Also, the water inside the jacket is not allowed to have air inside during operation, and if water is removed during stoppage, it will take a lot of work to vent the air when operation is resumed. Immediately after stopping, the cooling water temperature, which is about 30 ° C, also decreases with the passage of time and falls below the air temperature in the pipe, especially when the air temperature in the pipe is higher than the cooling water temperature. Condensation is likely to occur.

この様に、停止時間が長く塩素分を多く含む排ガスの流通後のダクト内に結露が発生すると従前に比して腐食の進行が早く配管寿命が極端に短くなるという問題が生じるようになった。   In this way, if condensation occurs in the duct after the circulation of the exhaust gas containing a long amount of chlorine with a long stop time, the problem is that the corrosion progresses faster and the pipe life becomes extremely short compared to the conventional case. .

本発明は、上記従来の電気炉から排出される排ガスを吸引し、二重構造の水冷ジャケット式とした配管ダクト等を通過して集塵機で正常空気に処理した後大気中に排出するシステムにおいて、運転停止時に発生する結露によってダクト内腐食が生じ、ダクト寿命が短縮化されるという問題点に鑑み、運転停止時の結露によるダクト内腐食を低減せしめ、配管等の寿命の向上を図ることのできる配管内の結露防止方法を提供することを目的とする。   The present invention sucks the exhaust gas discharged from the conventional electric furnace, passes through a pipe duct or the like having a double-structured water-cooled jacket type, and is processed into normal air with a dust collector and then discharged into the atmosphere. In view of the problem that the corrosion in the duct is caused by the condensation that occurs when the operation is stopped and the life of the duct is shortened, the corrosion in the duct due to the condensation when the operation is stopped can be reduced, and the life of the piping and the like can be improved. It aims at providing the dew condensation prevention method in piping.

上記目的を達成するため、本発明の配管内の結露防止方法は、電気炉から排出される排ガスを吸引し、二重構造の水冷ジャケット式とした配管ダクト等を通過して集塵機で正常空気に処理した後大気中に排出するシステムにおいて、システム停止時に、ジャケット内に、配管内空気温度以上の温水を供給することを特徴とする。   In order to achieve the above object, the dew condensation prevention method in the pipe of the present invention sucks the exhaust gas discharged from the electric furnace and passes it through a double-structured water-cooled jacket type pipe duct or the like to normal air with a dust collector. In the system that discharges to the atmosphere after processing, when the system is stopped, hot water that is equal to or higher than the air temperature in the pipe is supplied into the jacket.

この場合において、配管内空気温度を検出する温度検出器からの印加信号によってジャケットに送水する水の温度を管理することができる。   In this case, the temperature of the water fed to the jacket can be managed by the applied signal from the temperature detector that detects the air temperature in the pipe.

また、第２の発明は、電気炉から排出される排ガスを吸引し、二重構造の水冷ジャケット式とした配管ダクト等を通過して集塵機で正常空気に処理した後大気中に排出するシステムにおいて、システム停止時に、ジャケット内の水温以下の温度の空気を配管内に供給することを特徴とする。   Further, the second invention is a system in which exhaust gas discharged from an electric furnace is sucked, passed through a pipe duct or the like having a double-structured water-cooled jacket type, processed into normal air with a dust collector, and then discharged into the atmosphere. When the system is stopped, air having a temperature equal to or lower than the water temperature in the jacket is supplied into the pipe.

この場合において、配管内に供給する空気の温度とジャケット内の水温を温度検出器によって検出し、該検出値に基づいてこれら空気温度と水温を管理することができる。   In this case, the temperature of the air supplied into the pipe and the water temperature in the jacket can be detected by the temperature detector, and the air temperature and water temperature can be managed based on the detected value.

本発明の配管内の結露防止方法では、運転停止時にジャケット内に存在する水の温度を配管内空気温度に比して相対的に高く保持することにより、配管内面を結露による腐食から有効に防止することができる。   In the method for preventing condensation in a pipe according to the present invention, the temperature of water existing in the jacket is kept relatively high compared to the air temperature in the pipe when operation is stopped, thereby effectively preventing the inner surface of the pipe from corrosion due to condensation. can do.

また、システム停止時に配管内空気温度を検出する温度検出器からの印加信号によってジャケットに送水する水の温度を管理するときは、必要以上にジャケット内の水温を上げる必要がなく省エネを図ることができる。   In addition, when managing the temperature of the water sent to the jacket by the applied signal from the temperature detector that detects the air temperature in the pipe when the system is stopped, it is not necessary to raise the water temperature in the jacket more than necessary, thus saving energy. it can.

更に、第２の発明においては冷却水を加熱することなく配管内に冷風を循環させることによって配管内面を結露による腐食から有効に防止することができる。   Furthermore, in the second invention, it is possible to effectively prevent the inner surface of the pipe from corrosion due to condensation by circulating the cool air in the pipe without heating the cooling water.

以下、本発明の配管内の結露防止方法の実施の形態を、図面に基づいて説明する。
従来例と同様の構成に関しては同様の符号を付しその説明を省略する。 Embodiments of a method for preventing condensation in piping according to the present invention will be described below with reference to the drawings.
The same components as those of the conventional example are denoted by the same reference numerals, and the description thereof is omitted.

図１に配管内の結露防止方法の第１実施例を示す。
本発明の配管内の結露防止方法ではシステム稼働時は、従来例と同様に電気炉１から排出される１４００〜１５００℃程度の排ガスを通す燃焼塔２や水冷ダクト３を含む配管ダクトに二重構造のジャケット方式（図例破線で示す）を採用し、該ジャケットＪ内に冷却装置６によって調整された冷却水を流出コック７から流入コック８を循環させることによって４００℃（好ましくは２５０℃程度）以下に冷却された排ガスが集塵機５で処理された後、清浄空気として排出管５ａを通過し外部に放出される。 FIG. 1 shows a first embodiment of a method for preventing condensation in piping.
In the method for preventing dew condensation in the pipe of the present invention, when the system is in operation, the pipe duct including the combustion tower 2 and the water cooling duct 3 through which the exhaust gas of about 1400 to 1500 ° C. discharged from the electric furnace 1 passes is doubled as in the conventional example. By adopting a jacket system (shown by a broken line in the figure) of the structure and circulating the cooling water adjusted by the cooling device 6 in the jacket J from the outflow cock 7 to the inflow cock 8, 400 ° C (preferably about 250 ° C) ) After the exhaust gas cooled below is processed by the dust collector 5, it passes through the discharge pipe 5a as clean air and is discharged to the outside.

冷却水は水槽Ｗから冷却装置６（例えばクーリングタワー）によって、冷却され循環ポンプＰによって流出コック７を介してジャケットＪ内に送水され、燃焼塔２や水冷ダクト３内の排ガスから抜熱した後に流入コック８を介し水槽Ｗに返還される。   The cooling water is cooled by the cooling device 6 (for example, a cooling tower) from the water tank W, is fed into the jacket J by the circulation pump P through the outflow cock 7, and flows out after removing heat from the exhaust gas in the combustion tower 2 and the water cooling duct 3. It is returned to the water tank W via the cock 8.

而して、システムを停止した後は、外気温測定器Ｔ２（本実施例では、外気の流入する流入管２ａ近傍に測定部を設けているが、燃焼塔２や水冷ダクト３の外壁より内部に貫通させて測定部を設けるようにしてもよい。）による温度信号と水温測定器Ｔ１による温度信号が比較され、水槽Ｗ内のヒーターＨを制御又はＯＮ・ＯＦＦして配管内空気温度以下にならないようにジャケットＪ内の水温をコントロールする。
ヒーターＨの熱源として電気炉１内の余熱や電気炉１により発生した熱を蓄熱したものを利用するように構成してもよい。 Thus, after the system is stopped, the outside air temperature measuring device T2 (in this embodiment, a measuring part is provided in the vicinity of the inflow pipe 2a into which the outside air flows, but the inside of the outer wall of the combustion tower 2 and the water cooling duct 3 is provided. And the temperature signal from the water temperature measuring device T1 is compared, and the heater H in the water tank W is controlled or turned ON / OFF to be equal to or lower than the air temperature in the pipe. The water temperature in jacket J is controlled so that it does not become.
As a heat source of the heater H, a configuration in which residual heat in the electric furnace 1 or heat generated by the electric furnace 1 is stored may be used.

なお、循環ポンプＰの吐出量等も制御機構Ｍによって制御することが好ましく、また、システム停止直前の冷却装置６の運転に関しても、配管内空気温度を考慮して制御機構Ｍによって制御するようにすることが好ましい。   Note that the discharge amount of the circulation pump P is preferably controlled by the control mechanism M, and the operation of the cooling device 6 immediately before the system is stopped is also controlled by the control mechanism M in consideration of the air temperature in the pipe. It is preferable to do.

水槽Ｗの大きさは特に限定されるものではないが、システム停止時に温水を供給する際の保温性を考慮してジャッケトＪの全容積を考慮した大きさで密閉化される様に構成することが好ましい。   Although the size of the water tank W is not particularly limited, it should be configured to be sealed with a size that takes into account the total volume of the jacket J in consideration of heat retention when supplying hot water when the system is stopped. Is preferred.

これにより、システム停止時のジャケットＪ内の水温は配管内空気温度より低くなることはなく、結露によって配管内面が腐食することはない。   Thereby, the water temperature in the jacket J when the system is stopped does not become lower than the air temperature in the pipe, and the inner surface of the pipe does not corrode due to condensation.

図２は、配管内の結露防止方法の第２実施例を示す。
第２の発明において、システム稼働時のジャケットＪ内に冷却水を送水し、排ガス温度を低下させる点は従来例・第１の発明と同様であり説明を省略する。 FIG. 2 shows a second embodiment of a method for preventing condensation in piping.
In the second invention, the point that the cooling water is fed into the jacket J when the system is operating and the exhaust gas temperature is lowered is the same as in the prior art and the first invention, and the description is omitted.

システム停止時には、冷却水を冷却する冷却装置６の運転を停止し、冷却装置９によって冷却された空気をファンＦによって流入管２ａ付近より配管内に送り込み、配管４から冷却装置９に循環せしめ、配管内の空気温度をジャケットＪ内を循環する冷却水の温度以上にならないように調整するものである。
なお、配管内に冷風を吹き込む際には、流入管２ａの入り口をメガネダンパー等（図示しない）によって封鎖し電気炉１側に冷風が流れ出ないように構成することはいうまでもない。 When the system is stopped, the operation of the cooling device 6 for cooling the cooling water is stopped, the air cooled by the cooling device 9 is sent into the pipe from the vicinity of the inflow pipe 2a by the fan F, and is circulated from the pipe 4 to the cooling apparatus 9. The air temperature in the piping is adjusted so as not to exceed the temperature of the cooling water circulating in the jacket J.
Needless to say, when the cool air is blown into the pipe, the inlet of the inflow pipe 2a is blocked by a spectacle damper or the like (not shown) so that the cool air does not flow out to the electric furnace 1 side.

この際、図３に示すように、第１の発明で説明したジャケットＪ内を循環する水の加温と併せて制御機構Ｍによって冷却装置９やファンＦを制御するように構成してもよい。   At this time, as shown in FIG. 3, the cooling device 9 and the fan F may be controlled by the control mechanism M together with the heating of the water circulating in the jacket J described in the first invention. .

また、冷却装置９の冷却媒体として水槽Ｗ内の冷却水を使いシステム全体のコストを低減させるようにすることもできる。   Further, the cooling water in the water tank W can be used as the cooling medium of the cooling device 9 to reduce the cost of the entire system.

以上、本発明の配管内の結露防止方法について、複数の実施例に基づいて説明したが、本発明は上記実施例に記載した構成に限定されるものではなく、各実施例に記載した構成を適宜組み合わせる等、その趣旨を逸脱しない範囲において適宜その構成を変更することができるものである。   As mentioned above, although the dew condensation prevention method in the piping of this invention was demonstrated based on several Example, this invention is not limited to the structure described in the said Example, The structure described in each Example was used. The configuration can be changed as appropriate within a range that does not depart from the spirit of the invention, such as appropriate combination.

本発明の配管内の結露防止方法は、新設の電気炉集塵システムに用いることができるほか、既設の電気炉集塵システムにおいても簡単な改造を施すことによって好適に用いることができる。   The dew condensation prevention method in the pipe of the present invention can be used for a newly installed electric furnace dust collection system, and can also be suitably used for existing electric furnace dust collection systems by performing simple modifications.

本発明の配管内の結露防止方法の第１実施例を説明する全体図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a general view explaining 1st Example of the dew condensation prevention method in piping of this invention. 本発明の配管内の結露防止方法の第２実施例を説明する全体図である。It is a whole figure explaining 2nd Example of the dew condensation prevention method in piping of this invention. 本発明の配管内の結露防止方法の第２実施例を説明する別の全体図である。It is another whole figure explaining 2nd Example of the dew condensation prevention method in piping of this invention. 従来の電気炉集塵システムを説明する全体図である。It is a general view explaining the conventional electric furnace dust collection system.

符号の説明Explanation of symbols

１ 電気炉
２ 燃焼塔
３ 水冷ダクト
Ｊ ジャケット 1 Electric furnace 2 Combustion tower 3 Water-cooled duct J Jacket

Claims (4)

電気炉から排出される排ガスを吸引し、二重構造の水冷ジャケット式とした配管ダクト等を通過して集塵機で正常空気に処理した後大気中に排出するシステムにおいて、システム停止時に、ジャケット内に、配管内空気温度以上の温水を供給することを特徴とする配管内の結露防止方法。   In a system that sucks the exhaust gas discharged from the electric furnace, passes it through a double-structured water-cooled jacket type piping duct, etc., processes it into normal air with a dust collector, and then discharges it into the atmosphere. A method for preventing dew condensation in a pipe, characterized by supplying hot water that is equal to or higher than the air temperature in the pipe. 配管内空気温度を検出する温度検出器からの印加信号によってジャケットに送水する水の温度を管理することを特徴とする請求項１記載の配管内の結露防止方法。   The dew condensation prevention method in a pipe according to claim 1, wherein the temperature of the water fed to the jacket is managed by an applied signal from a temperature detector for detecting the air temperature in the pipe. 電気炉から排出される排ガスを吸引し、二重構造の水冷ジャケット式とした配管ダクト等を通過して集塵機で正常空気に処理した後大気中に排出するシステムにおいて、システム停止時に、ジャケット内の水温以下の温度の空気を配管内に供給することを特徴とする配管内の結露防止方法。   In a system that sucks exhaust gas discharged from an electric furnace, passes through a pipe duct with a double-structured water-cooled jacket type, treats it with normal air with a dust collector, and then discharges it into the atmosphere. A method for preventing dew condensation in a pipe, wherein air having a temperature equal to or lower than the water temperature is supplied into the pipe. 配管内に供給する空気の温度とジャケット内の水温を温度検出器によって検出し、該検出値に基づいてこれら空気温度と水温を管理することを特徴とする請求項３記載の配管内の結露防止方法。   4. The dew condensation prevention in the pipe according to claim 3, wherein the temperature of the air supplied into the pipe and the water temperature in the jacket are detected by a temperature detector, and the air temperature and the water temperature are managed based on the detected value. Method.
JP2004054209A 2004-02-27 2004-02-27 Condensation prevention method in piping Expired - Fee Related JP4350554B2 (en)

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JP2009109107A (en) * 2007-10-31 2009-05-21 Nippon Spindle Mfg Co Ltd Cooling apparatus
CN101324408B (en) * 2008-08-04 2010-06-02 中国铝业股份有限公司 Flue gas waste heat recovery method of aluminum oxide gaseous state suspending calcining furnace
CN102243021A (en) * 2010-05-10 2011-11-16 中国石油天然气股份有限公司 Heat conducting oil smoke residual heat recovery method

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CN102313454A (en) * 2010-06-29 2012-01-11 沈阳铝镁设计研究院有限公司 Waste heat recovery device of calcinator
CN102435076A (en) * 2010-09-29 2012-05-02 中国铝业股份有限公司 Waste heat utilization method for fluidized-bed roaster in alumina production
CN102401580B (en) * 2011-12-02 2013-07-31 郑州远东耐火材料有限公司 Equipment for utilizing waste heat and improving internal circulating water of electric furnace

Cited By (3)

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Publication number Priority date Publication date Assignee Title
JP2009109107A (en) * 2007-10-31 2009-05-21 Nippon Spindle Mfg Co Ltd Cooling apparatus
CN101324408B (en) * 2008-08-04 2010-06-02 中国铝业股份有限公司 Flue gas waste heat recovery method of aluminum oxide gaseous state suspending calcining furnace
CN102243021A (en) * 2010-05-10 2011-11-16 中国石油天然气股份有限公司 Heat conducting oil smoke residual heat recovery method

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