JPH04285116A - Method for recovering atmospheric gas of heat-treating furnace and equipment therefor - Google Patents
Method for recovering atmospheric gas of heat-treating furnace and equipment thereforInfo
- Publication number
- JPH04285116A JPH04285116A JP7216891A JP7216891A JPH04285116A JP H04285116 A JPH04285116 A JP H04285116A JP 7216891 A JP7216891 A JP 7216891A JP 7216891 A JP7216891 A JP 7216891A JP H04285116 A JPH04285116 A JP H04285116A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- heat treatment
- treatment furnace
- furnace
- atmospheric 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
- 238000000034 method Methods 0.000 title claims description 8
- 239000007789 gas Substances 0.000 claims abstract description 83
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 230000008929 regeneration Effects 0.000 claims abstract description 27
- 238000011069 regeneration method Methods 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 20
- 239000011261 inert gas Substances 0.000 claims abstract description 16
- 238000007664 blowing Methods 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims description 29
- 230000003647 oxidation Effects 0.000 claims description 11
- 238000007254 oxidation reaction Methods 0.000 claims description 11
- 239000003054 catalyst Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims description 6
- 238000007791 dehumidification Methods 0.000 claims description 2
- 238000005192 partition Methods 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 21
- 239000001257 hydrogen Substances 0.000 abstract description 9
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 9
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 7
- 230000002829 reductive effect Effects 0.000 abstract description 7
- 125000004435 hydrogen atom Chemical class [H]* 0.000 abstract 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 10
- 229910001873 dinitrogen Inorganic materials 0.000 description 7
- 238000000137 annealing Methods 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 238000005246 galvanizing Methods 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000480 nickel oxide Inorganic materials 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、熱処理炉から流出する
雰囲気ガスを浄化して熱処理炉に返送する回収方法及び
装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recovery method and apparatus for purifying atmospheric gas flowing out of a heat treatment furnace and returning it to the heat treatment furnace.
【０００２】0002
【従来の技術】鋼板焼鈍用等の熱処理炉は、高温に加熱
された鋼板の酸化を防止するため、水素及び窒素を混合
した混合ガスにより還元性雰囲気に維持されている。ま
た、炉内雰囲気は、シールロールを使用して大気圧より
も若干高い炉内雰囲気に維持することにより、外気が炉
内に侵入することを防止している。2. Description of the Related Art Heat treatment furnaces for annealing steel plates are maintained in a reducing atmosphere using a mixed gas of hydrogen and nitrogen in order to prevent oxidation of steel plates heated to high temperatures. Furthermore, the atmosphere inside the furnace is maintained at a level slightly higher than atmospheric pressure using a seal roll, thereby preventing outside air from entering the furnace.
【０００３】炉内圧を大気圧より高く設定するとき、炉
内の雰囲気ガスが鋼板の入側や出側から炉外部に常時漏
出する。漏出した雰囲気ガスは、可燃性の水素を含有し
ているため、一般に燃焼処理した後で排気される。水素
は、高価なガスであり、これを燃焼して排気することは
製造コストを上昇させる原因となる。しかも、雰囲気ガ
スの漏出に伴って熱量も炉外に逸散し、熱経済的な損失
もある。[0003] When the pressure inside the furnace is set higher than atmospheric pressure, the atmospheric gas inside the furnace constantly leaks to the outside of the furnace from the inlet and outlet sides of the steel plate. Since the leaked atmospheric gas contains flammable hydrogen, it is generally exhausted after combustion treatment. Hydrogen is an expensive gas, and burning and exhausting it causes an increase in manufacturing costs. Moreover, as the atmospheric gas leaks, the amount of heat is also dissipated outside the furnace, resulting in a thermoeconomic loss.
【０００４】特に、溶融亜鉛めっきラインに組み込まれ
ている前焼鈍炉のように高い還元力の雰囲気が必要とさ
れる場合には、７５容量％程度まで水素含有量を高めた
雰囲気ガスが使用される。このような炉からは、多量の
水素が漏洩する。また、この漏洩分を補填するため、補
給する水素ガス量も多くなる。しかも、補給される水素
ガス量が多くなると、その水素ガスを炉内温度に昇温さ
せるために新たに熱供給を行うことが要求されることは
勿論、炉内の温度分布も不安定になる。[0004] In particular, when an atmosphere with high reducing power is required, such as in a pre-annealing furnace built into a hot-dip galvanizing line, an atmosphere gas with an increased hydrogen content of about 75% by volume is used. Ru. Such furnaces leak a large amount of hydrogen. Furthermore, in order to compensate for this leakage, the amount of hydrogen gas to be replenished also increases. Moreover, as the amount of hydrogen gas to be replenished increases, not only will new heat be required to raise the temperature of the hydrogen gas to the temperature inside the furnace, but the temperature distribution inside the furnace will also become unstable. .
【０００５】この雰囲気ガスの漏洩による問題を解消す
るため、従来から種々の提案が行われている。たとえば
、特開昭５６−１３６９１７号公報，特公昭６１−４０
７３０号公報では、焼鈍炉から排出された雰囲気ガスを
熱交換することによって、熱量の回収を図ることが提案
されている。また、特開平１−１８８６３３号公報では
、加熱帯高温部から流出したガスを雰囲気ガスと熱交換
し、昇温した雰囲気ガスを予熱帯に拭き込むことが提案
されている。更に、一部では、流出したガスを再生した
後、炉内に返送する方式も採用されている。[0005] Various proposals have been made in the past in order to solve the problem caused by the leakage of atmospheric gas. For example, Japanese Patent Publication No. 56-136917, Japanese Patent Publication No. 61-40
No. 730 proposes recovering heat by exchanging heat with atmospheric gas discharged from an annealing furnace. Further, Japanese Patent Application Laid-Open No. 1-188633 proposes that the gas flowing out from the high temperature section of the heating zone is heat exchanged with atmospheric gas, and the heated atmospheric gas is wiped into the preheating zone. Furthermore, in some cases, a method is adopted in which the gas that has flowed out is regenerated and then returned to the furnace.
【０００６】[0006]
【発明が解決しようとする課題】何れの方法によっても
、熱処理炉から漏出する雰囲気ガス及びその熱量を有効
に回収することはできない。特に、鋼板が導入される熱
処理炉入側に炉内雰囲気を大気から遮断するためにシー
ルロール対が設けられているが、このシールロール対と
鋼板との間の隙間を介して外部に雰囲気ガスが流出する
ことに対して有効な対策が採られていない。[Problems to be Solved by the Invention] No matter which method is used, it is not possible to effectively recover the atmospheric gas leaking from the heat treatment furnace and the amount of heat thereof. In particular, a pair of seal rolls is provided on the entry side of the heat treatment furnace where the steel plate is introduced to insulate the furnace atmosphere from the atmosphere. No effective measures have been taken to prevent the leakage.
【０００７】たとえば、熱処理炉入側から炉内に至るガ
ス循環系を設けたものにあっては、雰囲気ガスの全量が
ガス循環系を介し炉内に返送されるものではなく、依然
として外部に漏出する雰囲気ガスがある。For example, in a heat treatment furnace equipped with a gas circulation system from the entrance side to the inside of the furnace, the entire amount of atmospheric gas is not returned to the furnace through the gas circulation system, and some gas still leaks to the outside. There is an atmosphere of gas.
【０００８】本発明は、このような問題を解消するため
に案出されたものであり、熱処理炉入側の雰囲気を多段
に調節することによって、流出した雰囲気ガスを全量回
収して熱処理炉に返送し、高価な水素ガスの浪費をなく
すことを目的とする。The present invention was devised to solve these problems, and by controlling the atmosphere on the entrance side of the heat treatment furnace in multiple stages, the entire amount of the atmospheric gas that has flowed out is recovered and transferred to the heat treatment furnace. The purpose is to eliminate the waste of expensive hydrogen gas by returning it.
【０００９】[0009]
【課題を解決するための手段】本発明の雰囲気ガス回収
方法は、その目的を達成するため、熱処理炉の鋼板導入
部に設けたガス吸引口を介して前記熱処理炉から流出す
る雰囲気ガスを再生ラインに循環させ、酸素及び水蒸気
を除去した後の再生ガスを前記熱処理炉炉に返送すると
共に、前記熱処理炉の内部から前記再生ラインへの前記
雰囲気ガスの吸引によって前記鋼板導入部の雰囲気圧を
低下させ、該低下した雰囲気圧と同等或いはそれ以上の
圧力で不活性ガスを前記ガス吸引口よりも上流側の前記
鋼板導入部に供給することを特徴とする。[Means for Solving the Problems] In order to achieve the object, the atmospheric gas recovery method of the present invention regenerates the atmospheric gas flowing out from the heat treatment furnace through a gas suction port provided at the steel sheet introduction part of the heat treatment furnace. The regeneration gas after oxygen and water vapor have been removed is returned to the heat treatment furnace, and the atmospheric pressure at the steel sheet introduction part is reduced by suctioning the atmospheric gas from the inside of the heat treatment furnace to the regeneration line. The method is characterized in that the inert gas is supplied to the steel plate introduction section upstream of the gas suction port at a pressure equal to or higher than the reduced atmospheric pressure.
【００１０】また、この方法を実施するための回収装置
は、熱処理炉の鋼板導入部に配置され、該鋼板導入部を
複数のチャンバーに仕切るに多段のシールロール対と、
通板方向に関して下流側のチャンバーに設けられたガス
吸引口に一端が接続され、他端が前記熱処理炉の内部に
開口した再生ラインと、上流側のチャンバーに開口した
不活性ガス吹込み管とを備えており、前記再生ラインに
は、前記熱処理炉から流出した雰囲気ガスの流れ方向に
沿って酸化触媒槽及び除湿装置が設けられていることを
特徴とする。[0010] A recovery device for carrying out this method is disposed at the steel plate introduction part of the heat treatment furnace, and includes a multistage pair of seal rolls for partitioning the steel plate introduction part into a plurality of chambers;
a regeneration line whose one end is connected to a gas suction port provided in a chamber on the downstream side in the sheet passing direction and whose other end is open to the inside of the heat treatment furnace; and an inert gas blowing pipe opened to the chamber on the upstream side. The regeneration line is characterized in that an oxidation catalyst tank and a dehumidification device are provided along the flow direction of the atmospheric gas flowing out from the heat treatment furnace.
【００１１】[0011]
【実施例】以下、図面を参照しながら、実施例によって
本発明を具体的に説明する。本実施例においては、図１
に示すように熱処理炉１０の鋼板導入部１１にシールロ
ール対１２〜１４が多段に設けられている。鋼板導入部
１１は、これらシールロール対１２〜１４によって炉内
１５から下流側チャンバー１６及び上流側チャンバー１
７に区画されている。下流側チャンバー１６には、ガス
吸引口１８が設けられている。[Examples] The present invention will be specifically explained below by way of examples with reference to the drawings. In this example, FIG.
As shown in the figure, seal roll pairs 12 to 14 are provided in multiple stages in a steel plate introduction section 11 of a heat treatment furnace 10. The steel plate introduction part 11 is connected from the furnace interior 15 to the downstream chamber 16 and the upstream chamber 1 by these seal roll pairs 12 to 14.
It is divided into 7 sections. A gas suction port 18 is provided in the downstream chamber 16 .
【００１２】再生ライン２０は、一端がガス吸引口１８
に接続され、他端が炉内１５に開口する配管２１を備え
ている。配管２１には、下流側チャンバー１６から過剰
の雰囲気ガスを再生ライン２０に逃がすための炉圧制御
弁２２が設けられている。炉圧制御弁２２は、適宜の圧
力計によって測定された炉内１５の雰囲気圧が制御信号
として入力され、その雰囲気圧に対応した開度に自動的
に設定される。The regeneration line 20 has one end connected to the gas suction port 18.
A pipe 21 is connected to the furnace 15 and the other end thereof opens into the furnace interior 15. The piping 21 is provided with a furnace pressure control valve 22 for releasing excess atmospheric gas from the downstream chamber 16 to the regeneration line 20. The furnace pressure control valve 22 receives the atmospheric pressure in the furnace 15 measured by a suitable pressure gauge as a control signal, and is automatically set to an opening corresponding to the atmospheric pressure.
【００１３】炉圧制御弁２２の下流側に、循環ファン２
３が設けられている。循環ファン２３によって、炉内１
５から下流側チャンバー１６に流入した雰囲気ガスが再
生ライン２０に吸引される。これにより、下流側チャン
バー１６の内圧は、一定に維持される。A circulation fan 2 is installed downstream of the furnace pressure control valve 22.
3 is provided. The inside of the furnace 1 is
Atmospheric gas flowing into the downstream chamber 16 from the regeneration line 20 is sucked into the regeneration line 20. Thereby, the internal pressure of the downstream chamber 16 is maintained constant.
【００１４】再生ライン２０に送り込まれた雰囲気ガス
は、次いで酸化触媒槽２４に送り込まれる。酸化触媒槽
２４には酸化鉄，酸化ニッケル，酸化クロム等の酸化触
媒が充填されており、雰囲気ガスが酸化触媒槽２４を通
過する間に、雰囲気ガスに混入した酸素が水素と反応し
、水蒸気となる。The atmospheric gas sent into the regeneration line 20 is then sent into the oxidation catalyst tank 24. The oxidation catalyst tank 24 is filled with oxidation catalysts such as iron oxide, nickel oxide, chromium oxide, etc., and while the atmospheric gas passes through the oxidation catalyst tank 24, oxygen mixed in the atmospheric gas reacts with hydrogen, and water vapor is generated. becomes.
【００１５】酸化触媒槽２４を通過した雰囲気ガスは、
除湿装置２５に送られる。除湿装置２５にはシリカゲル
等の除湿剤が充填されており、酸化触媒槽２４で発生し
た水蒸気及び鋼板換言により発生した水蒸気を雰囲気ガ
スから除去する。このようにして、酸素が除去された雰
囲気ガスは、返送口２６から炉内１５に返送される。The atmospheric gas that has passed through the oxidation catalyst tank 24 is
It is sent to the dehumidifier 25. The dehumidifying device 25 is filled with a dehumidifying agent such as silica gel, and removes the water vapor generated in the oxidation catalyst tank 24 and the water vapor generated by the steel plate conversion from the atmospheric gas. The atmospheric gas from which oxygen has been removed in this way is returned to the furnace interior 15 through the return port 26.
【００１６】他方、上流側チャンバー１７には、不活性
ガスとして安価な窒素を吹き込むため、窒素ガス供給源
に接続された不活性ガス吹込み管３０が開口している。
また、不活性ガス吹込み管３０には、圧力制御弁３１が
設けられている。圧力制御弁３１は、炉圧制御弁２２と
連動し、下流側チャンバー１６の内圧をＰ１ 、上流側
チャンバー１７の内圧をＰ２ とするとき、Ｐ１ ≦Ｐ
２ の関係が維持されるように開度が設定される。On the other hand, an inert gas blowing pipe 30 connected to a nitrogen gas supply source is opened in the upstream chamber 17 in order to blow cheap nitrogen as an inert gas. Further, the inert gas blowing pipe 30 is provided with a pressure control valve 31 . The pressure control valve 31 works in conjunction with the furnace pressure control valve 22, and when the internal pressure of the downstream chamber 16 is P1 and the internal pressure of the upstream chamber 17 is P2, P1 ≦P
The opening degree is set so that the following relationship is maintained.
【００１７】たとえば、溶融亜鉛めっきラインで使用さ
れる前焼鈍炉は、炉内１５の雰囲気圧Ｐ０ が大気圧よ
りも１０〜２０ｍｍ水柱高い値に維持される。この圧力
差によって炉内１５の雰囲気ガスが、鋼板導入部から外
部に流出し易い。そこで、下流側チャンバー１６の内圧
Ｐ１ が７〜１０ｍｍ水柱となるように、炉内１５から
下流側チャンバー１６に流入した雰囲気ガスを再生ライ
ン２０に吸引した。また、上流側チャンバー１７の内圧
Ｐ２ が７〜１０ｍｍ水柱の範囲で内圧Ｐ１ 或いはそ
れ以上になるように、不活性ガス吹込み管３０を介して
上流側チャンバー１７に窒素ガスを吹込んだ。For example, in a pre-annealing furnace used in a hot-dip galvanizing line, the atmospheric pressure P0 in the furnace 15 is maintained at a value 10 to 20 mm of water column higher than atmospheric pressure. Due to this pressure difference, the atmospheric gas in the furnace 15 tends to flow out from the steel plate introduction part. Therefore, the atmospheric gas flowing into the downstream chamber 16 from the furnace interior 15 was sucked into the regeneration line 20 so that the internal pressure P1 of the downstream chamber 16 was 7 to 10 mm water column. Further, nitrogen gas was blown into the upstream chamber 17 through the inert gas blowing pipe 30 so that the internal pressure P2 of the upstream chamber 17 was equal to or higher than the internal pressure P1 within the range of 7 to 10 mm of water column.
【００１８】この窒素ガスの吹込みにより、下流側チャ
ンバー１６から上流側チャンバー１７への雰囲気ガスの
流出がなくなり、上流側チャンバー１７から外部に流出
するものは、上流側チャンバー１７に吹込まれた窒素ガ
スのみとなった。また、下流側チャンバー１６から再生
ライン２０に送り込まれた雰囲気ガスは、酸化触媒槽２
４及び除湿装置２５を通過した後で酸素濃度０．１容量
％以下、露点−７０℃に浄化されたものであった。した
がって、炉内１５が酸素等の不純物で汚染されることが
ないため、通板された鋼板４０は、焼鈍後に酸化物のな
い清浄な表面をもっていた。By blowing this nitrogen gas, the outflow of atmospheric gas from the downstream chamber 16 to the upstream chamber 17 is stopped, and what flows out from the upstream chamber 17 to the outside is the nitrogen blown into the upstream chamber 17. It became only gas. Further, the atmospheric gas sent from the downstream chamber 16 to the regeneration line 20 is transferred to the oxidation catalyst tank 2
4 and a dehumidifier 25, it was purified to an oxygen concentration of 0.1% by volume or less and a dew point of -70°C. Therefore, since the inside of the furnace 15 is not contaminated with impurities such as oxygen, the passed steel sheet 40 had a clean surface free of oxides after annealing.
【００１９】通常の操業状態で、下流側チャンバー１６
から再生ライン２０に送り込まれる雰囲気ガスの流量は
１０Ｎｍ３ ／分であった。すなわち、本発明に従った
回収装置を設けない場合、この雰囲気ガスが損失流量と
して外部に放出されると共に、それに伴った熱量の逸散
があることになる。また、再生ライン２０に沿って雰囲
気ガスを循環させるが、不活性ガス吹込み管３０を介し
て窒素ガスを吹き込まない場合には、下流側チャンバー
１６から上流側チャンバー１７を経て外部に放出される
雰囲気ガスの流れがあり、危険防止のために漏出した雰
囲気ガスに含まれている水素を燃焼させる必要があった
。Under normal operating conditions, the downstream chamber 16
The flow rate of the atmospheric gas sent into the regeneration line 20 was 10 Nm3/min. That is, if the recovery device according to the present invention is not provided, this atmospheric gas will be released to the outside as a loss flow rate, and the amount of heat will be dissipated accordingly. In addition, although atmospheric gas is circulated along the regeneration line 20, if nitrogen gas is not blown in through the inert gas blowing pipe 30, it is released from the downstream chamber 16 to the upstream chamber 17 to the outside. There was a flow of atmospheric gas, and to prevent danger, it was necessary to burn off the hydrogen contained in the leaked atmospheric gas.
【００２０】これに対し、再生ライン２０に沿った雰囲
気ガスの循環及び不活性ガス吹込み管３０を介した窒素
ガスの吹込みを行った場合、前述したように雰囲気ガス
の漏洩が完全に無くなり、炉内１５に補給される雰囲気
ガスの流量を１Ｎｍ３ ／分から４Ｎｍ３ ／分に節減
することができた。しかも、循環される雰囲気ガスが脱
酸素及び除湿されたものであるため、炉内１５の雰囲気
が劣化することなく、４８時間経過後も初期と同じ状況
で鋼板４０の焼鈍を行うことができた。そして、上流側
チャンバー１７から外部に漏出するガスは、水素よりも
安価で且つ不燃性の窒素であるため、操業上の安全性及
びガス消費の経済性も向上した。On the other hand, when the atmospheric gas is circulated along the regeneration line 20 and nitrogen gas is blown in through the inert gas blowing pipe 30, the leakage of the atmospheric gas is completely eliminated as described above. , the flow rate of atmospheric gas supplied into the furnace interior 15 could be reduced from 1 Nm3/min to 4 Nm3/min. Moreover, since the atmospheric gas being circulated was deoxidized and dehumidified, the atmosphere in the furnace 15 did not deteriorate, and the steel plate 40 could be annealed under the same conditions as the initial stage even after 48 hours had passed. . Furthermore, since the gas leaking to the outside from the upstream chamber 17 is nitrogen, which is less expensive than hydrogen and is nonflammable, operational safety and economy of gas consumption are also improved.
【００２１】以上の実施例においては、不活性ガス吹込
み管３０を介して吹込んだ窒素ガスを雰囲気ガスと置換
して外部に漏出させている。しかし、この不活性ガスの
吹込みを省略し、且つ雰囲気ガスの漏出を可能な限り抑
えることも可能である。この場合には、鋼板導入部１１
に多数のシールロール対１２〜１４を多段配置し、３個
或いはそれ以上のチャンバーに鋼板導入部１１を区分す
る。そして、それぞれのチャンバーの内圧を炉内１５側
に向けて高く設定し、最も上流側にあるチャンバーの内
圧を大気圧に維持する。これにより、炉内１５から流出
した雰囲気ガスは、それぞれのチャンバーに接続された
再生ライン２０に送り込まれ、上流側に向けて流れ炉外
に流出する雰囲気ガスの流量を著しく低減することがで
きる。In the embodiments described above, the nitrogen gas blown in through the inert gas blowing pipe 30 is replaced with atmospheric gas and leaked to the outside. However, it is also possible to omit this inert gas blowing and to suppress leakage of atmospheric gas as much as possible. In this case, the steel plate introduction part 11
A large number of seal roll pairs 12 to 14 are arranged in multiple stages, and the steel plate introduction section 11 is divided into three or more chambers. Then, the internal pressure of each chamber is set higher toward the furnace interior 15 side, and the internal pressure of the chamber closest to the upstream side is maintained at atmospheric pressure. Thereby, the atmospheric gas flowing out from the inside of the furnace 15 is sent to the regeneration line 20 connected to each chamber, and the flow rate of the atmospheric gas flowing out of the furnace toward the upstream side can be significantly reduced.
【００２２】[0022]
【発明の効果】以上に説明したように、本発明において
は、熱処理炉の入側から外部に流出する雰囲気ガスを窒
素ガスと置換し、再生ラインを経由して雰囲気ガスを炉
内に返送し、雰囲気ガスが直接外部に漏出することを防
止している。雰囲気ガスは、再生ラインで脱酸素及び除
湿されるため、炉内雰囲気を劣化することなく循環使用
される。このように雰囲気ガスの有効利用を図ることに
より、漏出分を補填する補給量が節減されると共に、操
業性も改善される。[Effects of the Invention] As explained above, in the present invention, the atmospheric gas flowing out from the inlet side of the heat treatment furnace is replaced with nitrogen gas, and the atmospheric gas is returned to the furnace via the regeneration line. , preventing atmospheric gas from leaking directly to the outside. Since the atmospheric gas is deoxidized and dehumidified in the regeneration line, it can be circulated and used without deteriorating the atmosphere inside the furnace. By effectively utilizing the atmospheric gas in this manner, the amount of replenishment required to compensate for leakage can be reduced, and operability is also improved.
【図１】 本発明実施例の雰囲気ガス回収装置を示す
。FIG. 1 shows an atmospheric gas recovery device according to an embodiment of the present invention.
１０ 熱処理炉 １１ 鋼板導入部
１２〜１４ シールロール対
１５ 炉内 １６ 下流側チャ
ンバー １７ 上流側チャンバー
１８ ガス吸引口 ２０ 再生ライン
２１ 配管
２２ 炉圧制御弁 ２３ 循環ファン
２４ 酸化触媒槽
２５ 除湿装置 ２６ 返送口
３０ 不活性ガス吹込み管10 Heat treatment furnace 11 Steel plate introduction section
12-14 Seal roll pair 15 Inside the furnace 16 Downstream chamber 17 Upstream chamber 18 Gas suction port 20 Regeneration line
21 Piping 22 Furnace pressure control valve 23 Circulation fan
24 Oxidation catalyst tank 25 Dehumidifier 26 Return port
30 Inert gas blowing pipe
Claims (2)
引口を介して前記熱処理炉から流出する雰囲気ガスを再
生ラインに循環させ、酸素及び水蒸気を除去した後の再
生ガスを前記熱処理炉に返送すると共に、前記熱処理炉
の内部から前記再生ラインへの前記雰囲気ガスの吸引に
よって前記鋼板導入部の雰囲気圧を低下させ、該低下し
た雰囲気圧と同等或いはそれ以上の圧力で不活性ガスを
前記ガス吸引口よりも上流側の前記鋼板導入部に供給す
ることを特徴とする熱処理炉雰囲気ガスの回収方法。1. Circulating atmospheric gas flowing out of the heat treatment furnace to a regeneration line through a gas suction port provided at a steel plate introduction part of the heat treatment furnace, and supplying the regeneration gas after removing oxygen and water vapor to the heat treatment furnace. At the same time, the atmospheric pressure at the steel plate introduction section is lowered by suctioning the atmospheric gas from the inside of the heat treatment furnace to the regeneration line, and the inert gas is introduced into the steel sheet at a pressure equal to or higher than the lowered atmospheric pressure. A method for recovering heat treatment furnace atmospheric gas, characterized in that the gas is supplied to the steel plate introduction section upstream of the gas suction port.
鋼板導入部を複数のチャンバーに仕切る多段のシールロ
ール対と、通板方向に関して下流側のチャンバーに設け
られたガス吸引口に一端が接続され、他端が前記熱処理
炉の内部に開口した再生ラインと、上流側のチャンバー
に開口した不活性ガス吹込み管とを備えており、前記再
生ラインには、前記熱処理炉から流出した雰囲気ガスの
流れ方向に沿って酸化触媒槽及び除湿装置が設けられて
いることを特徴とする熱処理炉雰囲気ガスの回収装置。2. A pair of multi-stage seal rolls arranged at a steel plate introduction part of a heat treatment furnace to partition the steel plate introduction part into a plurality of chambers, and a gas suction port provided in a downstream chamber in the sheet passing direction. The regeneration line is connected to the heat treatment furnace, and includes a regeneration line whose other end opens into the inside of the heat treatment furnace, and an inert gas blowing pipe that opens into an upstream chamber, and the regeneration line is equipped with an atmosphere flowing out from the heat treatment furnace. A heat treatment furnace atmospheric gas recovery device, characterized in that an oxidation catalyst tank and a dehumidification device are provided along the gas flow direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3072168A JP2601378B2 (en) | 1991-03-13 | 1991-03-13 | Method and apparatus for recovering atmosphere gas of heat treatment furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3072168A JP2601378B2 (en) | 1991-03-13 | 1991-03-13 | Method and apparatus for recovering atmosphere gas of heat treatment furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04285116A true JPH04285116A (en) | 1992-10-09 |
| JP2601378B2 JP2601378B2 (en) | 1997-04-16 |
Family
ID=13481442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3072168A Expired - Lifetime JP2601378B2 (en) | 1991-03-13 | 1991-03-13 | Method and apparatus for recovering atmosphere gas of heat treatment furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2601378B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008015964A1 (en) | 2006-08-03 | 2008-02-07 | Mitsubishi-Hitachi Metals Machinery, Inc. | Sealing apparatus and strip plate continuously annealing equipment |
| JPWO2016024586A1 (en) * | 2014-08-13 | 2017-07-20 | 国立研究開発法人産業技術総合研究所 | Metal material processing equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60224713A (en) * | 1984-04-23 | 1985-11-09 | Daido Steel Co Ltd | Gas sealing apparatus |
| JPS6145690A (en) * | 1984-08-10 | 1986-03-05 | Mitsubishi Heavy Ind Ltd | Processor of binary picture |
| JPS6173827A (en) * | 1984-09-20 | 1986-04-16 | Daido Steel Co Ltd | Atmosphere heat treatment device |
| JPS61106750A (en) * | 1984-10-31 | 1986-05-24 | Nippon Kokan Kk <Nkk> | Weather resistant steel plate of more than 16mm thickness having high weldability |
| JPH02228420A (en) * | 1989-01-17 | 1990-09-11 | Linde Ag | Heat treating method for metal piece under protecting gas abundant in hydrogen in blast furnace |
-
1991
- 1991-03-13 JP JP3072168A patent/JP2601378B2/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60224713A (en) * | 1984-04-23 | 1985-11-09 | Daido Steel Co Ltd | Gas sealing apparatus |
| JPS6145690A (en) * | 1984-08-10 | 1986-03-05 | Mitsubishi Heavy Ind Ltd | Processor of binary picture |
| JPS6173827A (en) * | 1984-09-20 | 1986-04-16 | Daido Steel Co Ltd | Atmosphere heat treatment device |
| JPS61106750A (en) * | 1984-10-31 | 1986-05-24 | Nippon Kokan Kk <Nkk> | Weather resistant steel plate of more than 16mm thickness having high weldability |
| JPH02228420A (en) * | 1989-01-17 | 1990-09-11 | Linde Ag | Heat treating method for metal piece under protecting gas abundant in hydrogen in blast furnace |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008015964A1 (en) | 2006-08-03 | 2008-02-07 | Mitsubishi-Hitachi Metals Machinery, Inc. | Sealing apparatus and strip plate continuously annealing equipment |
| EP2048250A1 (en) * | 2006-08-03 | 2009-04-15 | Mitsubishi-Hitachi Metals Machinery, Inc. | Sealing apparatus and strip plate continuously annealing equipment |
| EP2048250A4 (en) * | 2006-08-03 | 2012-05-16 | Mitsubishi Hitachi Metals | Sealing apparatus and strip plate continuously annealing equipment |
| JPWO2016024586A1 (en) * | 2014-08-13 | 2017-07-20 | 国立研究開発法人産業技術総合研究所 | Metal material processing equipment |
| JP2021073370A (en) * | 2014-08-13 | 2021-05-13 | 国立研究開発法人産業技術総合研究所 | Treatment device for metallic material |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2601378B2 (en) | 1997-04-16 |
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