JPH0587569B2 - - Google Patents
Info
- Publication number
- JPH0587569B2 JPH0587569B2 JP2262340A JP26234090A JPH0587569B2 JP H0587569 B2 JPH0587569 B2 JP H0587569B2 JP 2262340 A JP2262340 A JP 2262340A JP 26234090 A JP26234090 A JP 26234090A JP H0587569 B2 JPH0587569 B2 JP H0587569B2
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- pressure
- sealing device
- exhaust gas
- heating zone
- 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.)
- Expired - Lifetime
Links
- 238000010438 heat treatment Methods 0.000 claims description 25
- 238000007789 sealing Methods 0.000 claims description 21
- 238000004891 communication Methods 0.000 claims description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 239000007789 gas Substances 0.000 description 32
- 238000000034 method Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 102100025490 Slit homolog 1 protein Human genes 0.000 description 1
- 101710123186 Slit homolog 1 protein Proteins 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、竪型連続鋼帯熱処理炉の外気侵入防
止方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for preventing outside air from entering a vertical continuous steel strip heat treatment furnace.
（従来の技術と発明が解決しようとする課題）
従来、たとえば、ステンレス鋼帯を、直火式加
熱帯を竪型にした竪型連続焼鈍炉で熱処理する場
合、炉内をO2濃度が10％以下となるように制御
する必要がある。(Problems to be Solved by the Prior Art and the Invention) Conventionally, for example, when heat treating a stainless steel strip in a vertical continuous annealing furnace with a vertical direct-fired heating zone, the O 2 concentration inside the furnace was 10. % or less.
ところで、直火式加熱帯が竪型であると、下部
の大気連通口部（炉尻）から外気が侵入するた
め、従来、この大気連通口部にシールロールを配
設し、外気の侵入を防止するようにしているが、
シールロール方式では鋼帯に傷が付きやすい。ま
た、ロールに軟いライニング材を設けることも実
用化されているが、ライニング材が摩耗すれば、
同調駆動が困難であり、また、メンテナンスを頻
繁に行わなければならないという問題を有する。 By the way, when a direct-fired heating zone is vertical, outside air enters through the atmosphere communication opening (furnace bottom) at the bottom, so conventionally a seal roll is placed at this atmosphere communication opening to prevent outside air from entering. I try to prevent it, but
With the seal roll method, the steel strip is easily damaged. Also, it has been put into practical use to provide a soft lining material to the roll, but if the lining material wears out,
There are problems in that synchronous driving is difficult and maintenance must be performed frequently.
したがつて、本発明は加熱帯の大気連通口部
に、気体シール装置を設け、この気体シール装置
からの噴出気体圧と炉内圧とを制御して外気の炉
内への侵入を効果的に防止する外気侵入防止方法
を提供することを目的とする。 Therefore, the present invention provides a gas sealing device at the atmosphere communication port of the heating zone, and controls the gas pressure ejected from the gas sealing device and the furnace internal pressure to effectively prevent outside air from entering the furnace. The purpose of the present invention is to provide a method for preventing outside air intrusion.
（課題を解決するための手段）
本発明は、前記目的を達成するために、直火式
加熱帯を竪型に配設した竪型連続鋼帯熱処理炉に
おいて、下部の大気連通口部に気体シール装置を
配設し、この気体シール装置に、直火式加熱帯の
排ガスを供給するとともに、前記大気連通口部近
傍の炉内圧を検出して、この検出値に基づき圧力
コントローラで排ガスダクト中の炉圧制御ダンパ
ーを作動させて当該炉内圧が設定圧力になるよう
に制御する一方、前記検出値に基づき差圧コント
ローラで前記気体シール装置への排ガス供給量を
制御することを特徴とする竪型連続鋼帯熱処理炉
の外気侵入防止方法である。(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a vertical continuous steel strip heat treatment furnace in which a direct-fired heating zone is vertically arranged, in which gas is supplied to the atmosphere communication port at the bottom. A sealing device is provided, and the gas sealing device is supplied with the exhaust gas from the direct-fired heating zone, and the pressure inside the furnace near the atmosphere communication port is detected, and based on this detected value, the pressure controller controls the pressure in the exhaust gas duct. The furnace pressure control damper is operated to control the internal pressure of the furnace to a set pressure, while the differential pressure controller controls the amount of exhaust gas supplied to the gas sealing device based on the detected value. This is a method for preventing outside air from entering a type continuous steel strip heat treatment furnace.
（実施例）
つぎに、本発明の一実施例を図面にしたがつて
説明する。(Example) Next, an example of the present invention will be described with reference to the drawings.
第１図において、１は直火バーナ３を有する直
火式加熱帯２を竪型に配設した竪型連続鋼帯熱処
理炉で、４は予熱帯、５はトツプロールチヤンバ
ー、６はデフレクタロール、７は冷却帯、８はデ
フレクタロール、９は最終冷却帯で、１０は前記
予熱帯４に設けた排ガスダクトである。 In Fig. 1, 1 is a vertical continuous steel strip heat treatment furnace in which a direct-fired heating zone 2 having a direct-fired burner 3 is vertically arranged, 4 is a preheating zone, 5 is a top roll chamber, and 6 is a deflector. 7 is a cooling zone, 8 is a deflector roll, 9 is a final cooling zone, and 10 is an exhaust gas duct provided in the preheating zone 4.
そして、前記直火式加熱帯２の下部である大気
連通口部２ａには、第２図に示す気体シール装置
１１が設けてある。 A gas sealing device 11 shown in FIG. 2 is provided at the atmosphere communication port 2a, which is the lower part of the direct-fired heating zone 2.
前記気体シール装置１１は、鋼帯Ｓの搬送通路
を挟んで配置された一対の静圧パツド１１ａ，１
１ｂからなり各静圧パッド１１ａ，１１ｂは、２
つの圧力室１２ａ，１２ｂに区画されるととも
に、鋼帯Ｓの平面部と対向する各圧力室１２ａ，
１２ｂの対向壁面には内方に傾斜したスリツト１
３が設けられ、各圧力室１２ａ，１２ｂはブロア
１４を介して前記排ガスダクト１０にシールガス
供給管１４ａによつて接続されている。１４ｂ
は、前記各圧力室１２ａ，１２ｂへの供給排ガス
量を初期設定するダンパーである。 The gas sealing device 11 includes a pair of static pressure pads 11a, 1 disposed across a conveyance path for the steel strip S.
Each static pressure pad 11a, 11b consists of 2
The pressure chambers 12a, 12b are partitioned into two pressure chambers 12a, 12b, and each pressure chamber 12a faces the flat surface of the steel strip S.
12b has an inwardly inclined slit 1 on the opposite wall surface.
3, and each pressure chamber 12a, 12b is connected to the exhaust gas duct 10 via a blower 14 by a seal gas supply pipe 14a. 14b
is a damper that initially sets the amount of exhaust gas to be supplied to each pressure chamber 12a, 12b.
また、前記排ガスダクト１０のブロア１４への
取出口１４ｃより上流には、炉圧制御ダンパー１
５が配設してある。 Further, a furnace pressure control damper 1 is provided upstream of the outlet 14c of the exhaust gas duct 10 to the blower 14.
5 are arranged.
さらに、前記加熱帯２の大気連通口部（炉尻）
２ａの近傍に炉圧検出器１６が設けられ、この炉
圧検出器１６の検出値に基づき、前記炉圧制御ダ
ンパー１５が圧力コントローラ１７により開閉す
る一方、前記検出値と大気圧とを比較して、差圧
コントローラ１８により、前記ブロア１４は回転
制御されるようになつている。 Furthermore, the atmosphere communication port (furnace bottom) of the heating zone 2
A furnace pressure detector 16 is provided near the furnace pressure detector 2a, and the furnace pressure control damper 15 is opened and closed by a pressure controller 17 based on the detected value of the furnace pressure detector 16, and the detected value is compared with atmospheric pressure. The rotation of the blower 14 is controlled by the differential pressure controller 18.
なお、前記実施例において、大気連通口部２ａ
は加熱帯２の炉尻であるが、加熱帯２に竪型の徐
冷帯が連設されている場合には、徐冷帯の炉尻で
ある。 In addition, in the above embodiment, the atmosphere communication port 2a
is the furnace bottom of the heating zone 2, but if a vertical slow cooling zone is connected to the heating zone 2, it is the furnace bottom of the slow cooling zone.
つぎに、前記構成の竪型連続鋼帯熱処理炉の外
気侵入防止方法を説明する。 Next, a method for preventing outside air from entering the vertical continuous steel strip heat treatment furnace having the above structure will be explained.
炉の操業中においては、種々の原因により炉内
圧が変動し、また、加熱帯２が竪型のものでは特
に炉尻から大気が侵入しやすい。 During operation of the furnace, the internal pressure of the furnace fluctuates due to various causes, and if the heating zone 2 is vertical, the atmosphere is likely to enter from the bottom of the furnace.
したがつて、本発明では、加熱帯２の大気連通
口部２ａに設置した炉圧検出器１６により炉内圧
が検出され、この検出値信号は圧力コントローラ
１７に入り、炉内圧が、たとえ、＋１〜３mmH2O
となるように前記炉圧制御ダンパー１５を駆動し
て、排ガスダクト１０の排ガス量を制御する。 Therefore, in the present invention, the furnace pressure is detected by the furnace pressure detector 16 installed at the atmosphere communication port 2a of the heating zone 2, and this detected value signal is input to the pressure controller 17, and the furnace pressure is increased even if the furnace pressure is +1. ~ 3mmH2O
The furnace pressure control damper 15 is driven so that the amount of exhaust gas in the exhaust gas duct 10 is controlled.
一方、前記検出値信号は差圧コントローラ１８
に入り、大気圧と比較され、その比較信号により
ブロア１４の回転数を制御して、前記気体シール
装置１１のスリツト１３からの噴出気体によるシ
ール能力を一定にする。 On the other hand, the detected value signal is the differential pressure controller 18
The pressure is compared with the atmospheric pressure, and the rotational speed of the blower 14 is controlled based on the comparison signal to keep the sealing ability of the gas ejected from the slit 13 of the gas sealing device 11 constant.
すなわち、前記検出値が設定値（大気圧との差
圧）より低いと、ブロア１４の回転数は増加し、
排ガス供給量が増加してシール気体装置１１自体
のシール性能を高めて、大気連通口部２ａ（シー
ル装置）からの外気の侵入を防止し、反対に高い
場合には、ブロア１４の回転数は減少し炉内雰囲
気を放出するようにする。 That is, when the detected value is lower than the set value (differential pressure from atmospheric pressure), the rotation speed of the blower 14 increases,
When the amount of exhaust gas supplied increases, the sealing performance of the sealing gas device 11 itself is improved to prevent outside air from entering through the atmosphere communication port 2a (sealing device). The atmosphere inside the furnace is released.
したがつて、炉内圧制御ダンパー１５の開閉と
ともに、気体シール装置１１からの噴出流体圧を
可変として、大気連通口部２ａでのシール能力を
一定とし、炉内圧を速やかに所定値（＋１〜３mm
H2O）になるようにし、かつ、その間における
外気の炉内侵入を防止するのである。 Therefore, with the opening and closing of the furnace pressure control damper 15, the fluid pressure ejected from the gas sealing device 11 is made variable to keep the sealing ability at the atmosphere communication port 2a constant, and the furnace pressure is quickly raised to a predetermined value (+1 to 3 mm).
H 2 O) and prevent outside air from entering the furnace during this time.
（発明の効果）
以上の説明で明らかなように、本発明によれ
ば、直火式加熱帯を竪型に配設した竪型連続鋼帯
熱処理炉の下部に設けた大気連通口部のシール
は、気体シール装置からの噴出気体で非接触で行
うため、鋼帯に傷を付けることはない。また、そ
の噴出気体は加熱帯で生成された酸素濃度が制御
された燃焼排ガスであるため、処理鋼帯を過酸化
させることもない。(Effects of the Invention) As is clear from the above description, according to the present invention, the seal of the atmosphere communication port provided at the lower part of the vertical continuous steel strip heat treatment furnace in which the direct-fired heating zone is vertically arranged. This is done without contact with the gas ejected from the gas sealing device, so there is no damage to the steel strip. Further, since the ejected gas is a combustion exhaust gas with a controlled oxygen concentration generated in the heating zone, the treated steel strip will not be overoxidized.
しかも、気体シール装置からのシール流体（噴
出気体）は前記大気連通口部の炉内圧により可変
としてあるため、炉内圧に変動があつても確実に
外気の炉内への侵入を防止することができる。 Moreover, since the sealing fluid (blown gas) from the gas sealing device is variable depending on the furnace internal pressure at the atmosphere communication port, it is possible to reliably prevent outside air from entering the furnace even if the furnace internal pressure fluctuates. can.
第１図は本発明を適用する竪型連続鋼帯熱処理
炉の概略説明図で、第２図は第１図の気体シール
装置の拡大図である。
２…直火式加熱帯、２ａ…大気連通口部、４…
予熱帯、１０…排ガスダクト、１１…気体シール
装置、１４…ブロア、１５…炉圧制御ダンパー、
１６…炉圧検出器、１７…圧力コントローラ、１
８…差圧コントローラ。
FIG. 1 is a schematic illustration of a vertical continuous steel strip heat treatment furnace to which the present invention is applied, and FIG. 2 is an enlarged view of the gas sealing device shown in FIG. 1. 2... Direct-fired heating zone, 2a... Atmosphere communication port, 4...
Pre-preparation zone, 10... Exhaust gas duct, 11... Gas seal device, 14... Blower, 15... Furnace pressure control damper,
16...Furnace pressure detector, 17...Pressure controller, 1
8...Differential pressure controller.
Claims (1)
熱処理炉において、下部の大気連通口部に気体シ
ール装置を配設し、この気体シール装置に、直火
式加熱帯の排ガスを供給するとともに、前記大気
連通口部近傍の炉内圧を検出して、この検出値に
基づき圧力コントローラで排ガスダクト中の炉圧
制御ダンパーを作動させて当該炉内圧が設定圧力
になるように制御する一方、前記検出値に基づき
差圧コントローラで前記気体シール装置への排ガ
ス供給量を制御することを特徴とする竪型連続鋼
帯熱処理炉の外気侵入防止方法。1. In a vertical continuous steel strip heat treatment furnace in which a direct-fired heating zone is arranged vertically, a gas sealing device is installed at the lower atmosphere communication port, and the exhaust gas from the direct-fired heating zone is connected to the gas sealing device. At the same time, the furnace internal pressure near the atmosphere communication port is detected, and based on this detected value, a pressure controller operates a furnace pressure control damper in the exhaust gas duct to control the furnace internal pressure to the set pressure. and, on the other hand, controlling the amount of exhaust gas supplied to the gas sealing device using a differential pressure controller based on the detected value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26234090A JPH04141529A (en) | 1990-09-28 | 1990-09-28 | Method for preventing infiltration of outdoor air in vertical type continuous heat treating furnace for steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26234090A JPH04141529A (en) | 1990-09-28 | 1990-09-28 | Method for preventing infiltration of outdoor air in vertical type continuous heat treating furnace for steel strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04141529A JPH04141529A (en) | 1992-05-15 |
| JPH0587569B2 true JPH0587569B2 (en) | 1993-12-17 |
Family
ID=17374395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26234090A Granted JPH04141529A (en) | 1990-09-28 | 1990-09-28 | Method for preventing infiltration of outdoor air in vertical type continuous heat treating furnace for steel strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04141529A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61110725A (en) * | 1984-11-02 | 1986-05-29 | Rozai Kogyo Kk | Outlet and inlet fluid sealing device of strip heat processing furnace |
| JPH028331A (en) * | 1988-06-27 | 1990-01-11 | Nkk Corp | Direct-fired strip heating device |
-
1990
- 1990-09-28 JP JP26234090A patent/JPH04141529A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61110725A (en) * | 1984-11-02 | 1986-05-29 | Rozai Kogyo Kk | Outlet and inlet fluid sealing device of strip heat processing furnace |
| JPH028331A (en) * | 1988-06-27 | 1990-01-11 | Nkk Corp | Direct-fired strip heating device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04141529A (en) | 1992-05-15 |
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