JPH0452232A - Continuous heat treatment for steel strip - Google Patents
Continuous heat treatment for steel stripInfo
- Publication number
- JPH0452232A JPH0452232A JP16140190A JP16140190A JPH0452232A JP H0452232 A JPH0452232 A JP H0452232A JP 16140190 A JP16140190 A JP 16140190A JP 16140190 A JP16140190 A JP 16140190A JP H0452232 A JPH0452232 A JP H0452232A
- Authority
- JP
- Japan
- Prior art keywords
- steel strip
- furnace
- combustion
- heat treatment
- direct
- 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.)
- Pending
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 57
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 53
- 239000010959 steel Substances 0.000 title claims abstract description 53
- 238000002485 combustion reaction Methods 0.000 claims abstract description 51
- 239000007789 gas Substances 0.000 claims abstract description 28
- 238000007664 blowing Methods 0.000 claims abstract description 9
- 239000011261 inert gas Substances 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 8
- 229910001873 dinitrogen Inorganic materials 0.000 abstract description 8
- 239000000446 fuel Substances 0.000 abstract description 5
- 238000013021 overheating Methods 0.000 abstract description 4
- 239000000567 combustion gas Substances 0.000 abstract description 3
- 230000001590 oxidative effect Effects 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 238000007747 plating Methods 0.000 description 4
- 238000000137 annealing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000000571 coke Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010812 mixed waste Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は鋼帯の連続熱処理方法に関する。[Detailed description of the invention] [Industrial application field] This invention relates to a continuous heat treatment method for steel strip.
この発明は、冷延深絞り鋼板、ステンレス鋼板の連続焼
鈍ライン、電磁鋼板の熱処理ライン、連続熱処理を含む
溶融めっきラインなどに利用される。The present invention is utilized in continuous annealing lines for cold-rolled deep-drawn steel sheets, stainless steel sheets, heat treatment lines for electrical steel sheets, hot-dip plating lines including continuous heat treatment, and the like.
［従来の技術］
鋼帯の連続熱処理設備では、ラジアントチューブによる
間接加熱炉に代えて直火加熱炉を備えたものがある。直
火加熱炉は、走行する鋼帯の表面に向かうバーナー群を
備えており、バーナーからの燃焼炎により鋼帯を直接加
熱１−る。また、バーナーとして無酸化燃焼バーナーが
用いられている。無酸化燃焼バーナーは、燃焼炎により
鋼帯を直接加熱するとともに、酸化スケールの生成を防
止し、さらにはすでに生成した酸化スケールを還元して
スケール量を減少する。[Prior Art] Some continuous heat treatment equipment for steel strips is equipped with a direct heating furnace instead of an indirect heating furnace using a radiant tube. A direct-fired heating furnace includes a group of burners directed toward the surface of a running steel strip, and directly heats the steel strip with combustion flame from the burners. Further, a non-oxidizing combustion burner is used as a burner. The non-oxidizing combustion burner directly heats the steel strip with a combustion flame, prevents the formation of oxide scale, and further reduces the amount of scale by reducing the oxide scale that has already been formed.
直火加熱炉で発生した燃焼排ガスは、直火加熱炉の入側
に接続された予熱炉に導く。予熱炉において燃焼排ガス
により鋼帯を予熱し、排ガスによる熱損失を低減するよ
うにしている。また、上記無酸化燃焼バーナーを備えた
直火加熱炉では、空気比０．７〜０．９５で燃料を燃焼
するのて、直火加熱炉からの燃焼排ガスには一酸化炭素
、水素などの多量の未燃分が含まわている。未燃分を含
む燃焼排ガスをそのまま炉外に排出すると熱損失の増大
を招くのて、従来ては炉外に排出するまでに未燃分を燃
焼させ、その燃焼熱を鋼帯の予熱に利用している。The combustion exhaust gas generated in the direct-fired heating furnace is led to a preheating furnace connected to the inlet side of the direct-fired heating furnace. The steel strip is preheated by combustion exhaust gas in the preheating furnace to reduce heat loss due to the exhaust gas. In addition, in a direct-fired heating furnace equipped with the above-mentioned non-oxidizing combustion burner, the fuel is combusted at an air ratio of 0.7 to 0.95, so the combustion exhaust gas from the direct-fired heating furnace contains carbon monoxide, hydrogen, etc. Contains a large amount of unburned matter. Discharging combustion exhaust gas containing unburned components directly outside the furnace would result in increased heat loss, so conventionally the unburned components were combusted before being discharged outside the furnace, and the combustion heat was used to preheat the steel strip. are doing.
このように燃焼排ガス中の未燃分を燃焼させる技術とし
て、たとえば特公昭５：］−３３９８４号公報て開示さ
れた技術がある。As a technique for burning unburned components in combustion exhaust gas in this manner, there is a technique disclosed in Japanese Patent Publication No. 5:]-33984, for example.
特公昭５３−３９８４８号公報て開示された連続焼鈍炉
では、予熱炉に、空気ノズルを備え、予熱室内に燃焼用
空気を送り込み、予熱炉内で未燃ガスを燃焼させる。In the continuous annealing furnace disclosed in Japanese Patent Publication No. 53-39848, the preheating furnace is equipped with an air nozzle, combustion air is sent into the preheating chamber, and unburnt gas is combusted within the preheating furnace.
［発明が解決しようとする課題」
特公昭５３−３９８４８号公報で開示された連続焼鈍炉
では、予熱炉において多量の未燃分を過剰空気により完
全燃焼する。また、空気ノズルは一箇所に集中して配置
されている。直火式加熱炉では従来炉とは異なり多量の
未燃分が発生するため、燃焼ガス温度は１５００℃以上
にも達する。このために、熱処理ラインが緊急停止した
場合、未燃分の燃焼炎により加熱された耐火物により鋼
帯が過熱され、鋼帯が破断することかあった。[Problems to be Solved by the Invention] In the continuous annealing furnace disclosed in Japanese Patent Publication No. 53-39848, a large amount of unburned matter is completely combusted in a preheating furnace using excess air. Furthermore, the air nozzles are concentrated in one location. Unlike conventional furnaces, direct-fired heating furnaces generate a large amount of unburned matter, so the combustion gas temperature reaches 1500°C or higher. For this reason, when the heat treatment line is brought to an emergency stop, the steel strip may be overheated by the refractory heated by the combustion flame of unburned components, causing the steel strip to break.
そこて、この発明は緊急停止時に鋼帯の破断を防止する
ことができる鋼帯の連続熱処理方法を提供しようとする
ものである。Therefore, it is an object of the present invention to provide a continuous heat treatment method for a steel strip that can prevent the steel strip from breaking during an emergency stop.
［課題を解決するための手段］
この発明の鋼帯の連続熱処理方法は、予熱炉および予熱
炉の出側に接続された直火加熱炉を備えた熱処理設備に
より鋼帯を連続熱処理する方法において、前記予熱炉の
出側寄りの位置で過剰空気比で燃焼させるバーナーから
燃焼用空気を鋼帯面に平行方向に吹き込んで直火加熱炉
からの燃焼排ガス中の未燃分を燃焼させる。また、熱処
理ライン停止時には、前記燃焼用空気の吹込みを停止す
るとともに、前記未燃分の燃焼位置で不活性ガスを鋼帯
面に垂直に吹き付ける。[Means for Solving the Problems] The continuous heat treatment method for a steel strip of the present invention is a method for continuously heat treating a steel strip using a heat treatment facility equipped with a preheating furnace and a direct-fired heating furnace connected to the exit side of the preheating furnace. , Combustion air is blown in parallel to the surface of the steel strip from a burner that performs combustion at an excess air ratio at a position near the exit side of the preheating furnace to burn unburned components in the combustion exhaust gas from the direct-fired heating furnace. Furthermore, when the heat treatment line is stopped, the blowing of the combustion air is stopped, and an inert gas is blown perpendicularly to the surface of the steel strip at the position where the unburned material is combusted.
燃焼排ガス中の未燃分の燃焼により発生した熱を鋼帯の
予熱に有効に利用するために、予熱炉の出側寄りで未燃
分を燃焼する。燃焼用空気を鋼帯面に平行方向に吹き込
むために、バーナーはバーナー軸が鋼帯面に平行となる
ように配置されるか、鋼帯の両面側にそれぞｔ配置する
ことか好ましい。燃焼用空気を鋼帯面に平行方向に吹き
込むのは、燃焼用空気による鋼帯の酸化を防ぐためであ
る。バーナーの数あるいは対の数は、複数であってもよ
い。複数あるいは複数対のバーナーを設ける場合には、
鋼帯の通板方向に沿って適当な間隔をおいて配置する。In order to effectively utilize the heat generated by the combustion of unburned components in the combustion exhaust gas for preheating the steel strip, the unburned components are combusted near the exit side of the preheating furnace. In order to blow combustion air in a direction parallel to the steel strip surface, it is preferable that the burners are arranged so that their burner axes are parallel to the steel strip surface, or that they are arranged on both sides of the steel strip. The reason why the combustion air is blown in parallel to the steel strip surface is to prevent the steel strip from being oxidized by the combustion air. The number of burners or pairs may be plural. When installing multiple or multiple pairs of burners,
Arrange them at appropriate intervals along the threading direction of the steel strip.
バーナーは燃焼排ガス中に燃焼用空気を吹き込んで未燃
分を燃焼させるものであるが、バーナーの消火を防ぎ、
燃焼を確実に維持するために少量の燃料をバーナーに供
給する。バーナーに供給する燃料として、コークス炉ガ
ス、軽油などが用いられる。空気量は直火加熱帯て生じ
る未燃ガスの燃焼に必要な量だけを供給する。A burner blows combustion air into the combustion exhaust gas to burn unburned matter, but it prevents the burner from extinguishing.
Supply a small amount of fuel to the burner to ensure combustion. Coke oven gas, light oil, etc. are used as fuel to be supplied to the burner. Only the amount of air required for combustion of unburned gas generated in the open heating zone is supplied.
ライン停止の際に鋼帯に吹き付ける冷却用不活性ガスと
しては、窒素ガスが適当である。Nitrogen gas is suitable as the cooling inert gas to be sprayed onto the steel strip when the line is stopped.
直火加熱炉は、竪型あるいは横型であってもよい。The direct-fired heating furnace may be vertical or horizontal.
［作用］
直火加熱炉からの燃焼排ガス中に含まれる未燃分は、バ
ーナーで吹き込まれた燃焼用空気により燃焼する。熱処
理ラインか停止した場合、不活性ガスは燃焼排ガス温度
を下げるとともに、停止した鋼帯を直接冷却する。不活
性ガスは鋼帯面に垂直に吹き付けられるので、冷却能は
高い。不活性ガスを鋼帯面に垂直に吹き付けた場合、伝
熱係数は鋼帯面に平行に吹き付けた場合の２倍となる。[Operation] Unburned components contained in the combustion exhaust gas from the direct-fired heating furnace are combusted by combustion air blown into the burner. When a heat treatment line is shut down, the inert gas lowers the flue gas temperature and directly cools the shut down steel strip. Since the inert gas is blown perpendicularly to the steel strip surface, the cooling capacity is high. When inert gas is blown perpendicularly to the steel strip surface, the heat transfer coefficient is twice that when it is blown parallel to the steel strip surface.
また、熱処理ライン停止時には、対流効果が増し、冷却
能が高くなる。Furthermore, when the heat treatment line is stopped, the convection effect increases and the cooling capacity increases.
［実施例］
第１図はこの発明の方法を実施する連続熱処理設備を併
設した溶融めっき設備の概略構成図である。[Example] FIG. 1 is a schematic diagram of a hot-dip plating facility equipped with a continuous heat treatment facility for carrying out the method of the present invention.
第１図に示すように、連続熱処理設備１は予熱炉２、直
火加熱炉３、均熱炉４、徐冷炉５および急冷炉６とから
なっている。溶融めっき設備８は連続熱処理設備１に続
いて設けられている。直火加熱炉３には、無酸化燃焼バ
ーナー群 （図示しない）か設けられている。予熱炉２
の出側寄り１１に、バーナー１６および窒素ガス吹付は
ノズル１８が配置される。第２図は、予熱炉２における
バーナー１６および窒素ガス吹付はノズル１８の配置状
況を示している。バーナー１６は鋼帯Ｓの両面側にそわ
そわ配置され、炉側壁１３に取り付けられている。窒素
ガス吹付はノズル１８はバーナー１６と同じ位置で、炉
前後壁１４にそれぞれ取り付けられている。As shown in FIG. 1, the continuous heat treatment equipment 1 includes a preheating furnace 2, a direct-fired heating furnace 3, a soaking furnace 4, a slow cooling furnace 5, and a rapid cooling furnace 6. Hot-dip plating equipment 8 is provided following continuous heat treatment equipment 1 . The direct-fired heating furnace 3 is provided with a group of non-oxidizing combustion burners (not shown). Preheating furnace 2
A burner 16 and a nitrogen gas nozzle 18 are arranged near the outlet side 11 of the tank. FIG. 2 shows the arrangement of the burner 16 and the nitrogen gas nozzle 18 in the preheating furnace 2. The burners 16 are arranged on both sides of the steel strip S and are attached to the furnace side wall 13. For nitrogen gas spraying, nozzles 18 are attached to the front and rear walls 14 of the furnace at the same position as the burner 16, respectively.
上記直火加熱炉３において、無酸化燃焼バーナーにより
空気比０．８で燃料 （コークス炉ガス）が不完全燃焼
され、鋼帯Ｓを直火加熱する。直火加熱炉３には予熱炉
２に向かうドラフトが加えられているので、直火加熱炉
３で発生した燃焼排ガスａは予熱炉２に流れ込む。予熱
炉２の出側寄りで、バーナー１６から吹き込まれた燃焼
用空気によって燃焼排ガス中の未燃分は燃焼される。直
火加熱炉３からの燃焼排ガスａおよび未燃分の燃焼ガス
の混合ガス流すによって、鋼帯Ｓは予熱される。In the direct-fired heating furnace 3, fuel (coke oven gas) is incompletely combusted by a non-oxidizing combustion burner at an air ratio of 0.8, and the steel strip S is directly heated. Since the direct-fired heating furnace 3 has a draft directed toward the preheating furnace 2, the combustion exhaust gas a generated in the direct-fired heating furnace 3 flows into the preheating furnace 2. Near the exit side of the preheating furnace 2, unburned components in the combustion exhaust gas are combusted by combustion air blown from the burner 16. The steel strip S is preheated by flowing a mixed gas of the combustion exhaust gas a from the direct-fired heating furnace 3 and the unburned combustion gas.
熱処理ラインが緊急停止した場合、直火加熱炉３の無酸
化燃焼バーナーは消火される。また、予熱炉２のバーナ
ー１６からの燃焼用空気吹込みも停止されると同時に窒
素ガスの吹込みを開始する。In the case of an emergency stop of the heat treatment line, the non-oxidizing combustion burner of the direct-fired heating furnace 3 is extinguished. Further, the blowing of combustion air from the burner 16 of the preheating furnace 2 is also stopped, and at the same time the blowing of nitrogen gas is started.
この結果、炉内温度および鋼帯温度は低下し、過熱によ
る鋼帯Ｓの破断は防止される。As a result, the temperature inside the furnace and the temperature of the steel strip decrease, and breakage of the steel strip S due to overheating is prevented.
第３図（ａ）および第３図（ｂ）は、それぞれ熱処理ラ
インか緊急停止した場合に予熱炉内における燃焼排ガス
Ｇおよび鋼帯Ｓの温度変化を示している。第３図（ａ）
はこの発明による場合であって、鋼帯Ｓの温度は１００
０℃以下となっている。これに対して従来の方法では、
第３図（ｂ）に示すように燃焼排カスＧおよび鋼帯Ｓの
温度は約１４００℃を維持したままである。FIG. 3(a) and FIG. 3(b) respectively show the temperature changes of the combustion exhaust gas G and the steel strip S in the preheating furnace when the heat treatment line is brought to an emergency stop. Figure 3(a)
is the case according to this invention, and the temperature of the steel strip S is 100
The temperature is below 0℃. In contrast, in the conventional method,
As shown in FIG. 3(b), the temperature of the combustion waste G and the steel strip S remains at approximately 1400°C.
第１表は熱処理ライン緊急停止における鋼帯破断回数を
示している。Table 1 shows the number of times the steel strip broke during emergency stoppage of the heat treatment line.
第１表
第１表から明らかなように、この発明の方法によれば熱
処理ライン緊急停止の場合、過熱による鋼帯の破断を防
止することができる。As is clear from Table 1, according to the method of the present invention, in the case of an emergency stop of the heat treatment line, it is possible to prevent the steel strip from breaking due to overheating.
［発明の効果］
この発明によれば、熱処理ラインが緊急停止した場合、
予熱炉において不活性ガスを吹き込むことにより燃焼排
ガスの温度を下げるとともに、鋼帯を直接冷却する。こ
の結果、鋼帯が過熱により破断することはない。[Effects of the Invention] According to this invention, when the heat treatment line has an emergency stop,
By blowing inert gas into the preheating furnace, the temperature of the flue gas is lowered and the steel strip is directly cooled. As a result, the steel strip will not break due to overheating.
第１図はこの発明の直火加熱炉を含む連続熱処理設備を
併設した溶融めっき設備の概略構成図、第２図は第１図
の予熱炉におけるバーナーおよび窒素ガス吹付はノズル
の配置状況を示す図面、ならびに第３図（ａ）および第
３図（ｂ）はそれぞれ熱処理ラインが緊急停止した場合
の予熱炉における燃焼排ガスおよび鋼帯の温度変化の一
例を示す線図で、第３図（ａ）はこの発明の方法による
場合、第３図（ｂ）は従来の方法による場合をそれぞれ
示している。
１・・・連続熱処理設備、２・・・予熱炉、３・・・直
火加熱炉、４・・・均熱炉、５・・・徐冷炉、６・・・
急冷炉、８・・・溶融めっき設備、１１・・・バーナー
設置位置、１３・・・予熱炉の側壁、１４・・・予熱炉
の前後壁、１６・・・バーナー、１８−・・窒素ガス吹
付はノズル、ａ・・・直火加熱炉からの燃焼排ガス、ｂ
−・・直火加熱炉からの燃焼排ガスおよび未燃分の燃焼
カスの混合カス流、Ｓ・・・鋼帯。Fig. 1 is a schematic configuration diagram of a hot-dip plating facility equipped with continuous heat treatment equipment including a direct-fired heating furnace according to the present invention, and Fig. 2 shows the arrangement of burners and nitrogen gas spray nozzles in the preheating furnace of Fig. 1. The drawings and FIGS. 3(a) and 3(b) are diagrams showing an example of the temperature changes of the flue gas and steel strip in the preheating furnace when the heat treatment line is brought to an emergency stop. ) shows the case using the method of the present invention, and FIG. 3(b) shows the case using the conventional method. 1... Continuous heat treatment equipment, 2... Preheating furnace, 3... Direct fire heating furnace, 4... Soaking furnace, 5... Slow cooling furnace, 6...
Rapid cooling furnace, 8...Hot dipping equipment, 11...Burner installation position, 13...Side wall of preheating furnace, 14...Front and rear walls of preheating furnace, 16...Burner, 18-...Nitrogen gas Spraying is done through a nozzle, a... combustion exhaust gas from a direct-fired heating furnace, b
-... Mixed waste flow of combustion exhaust gas and unburned residue from the direct-fired heating furnace, S... Steel strip.
Claims (1)
を備えた熱処理設備により鋼帯を連続熱処理する方法に
おいて、前記予熱炉の出側寄りの位置で燃焼用空気を鋼
帯面に平行方向に吹き込んで直火加熱炉からの燃焼排ガ
ス中の未燃分を燃焼させ、熱処理ライン停止時には前記
燃焼用空気の吹込みを停止するとともに、前記未燃分の
燃焼位置で不活性ガスを鋼帯面に垂直に吹き付けること
を特徴とする鋼帯の連続熱処理方法。1. In a method of continuously heat-treating a steel strip using a heat treatment facility equipped with a preheating furnace and a direct-fired heating furnace connected to the exit side of the preheating furnace, combustion air is supplied to the steel strip surface at a position near the exit side of the preheating furnace. When the heat treatment line is stopped, the blowing of the combustion air is stopped, and inert gas is blown at the combustion position of the unburned gas to burn the unburned air in the combustion exhaust gas from the direct-fired heating furnace. A continuous heat treatment method for steel strip, characterized by spraying perpendicularly onto the surface of the steel strip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16140190A JPH0452232A (en) | 1990-06-21 | 1990-06-21 | Continuous heat treatment for steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16140190A JPH0452232A (en) | 1990-06-21 | 1990-06-21 | Continuous heat treatment for steel strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0452232A true JPH0452232A (en) | 1992-02-20 |
Family
ID=15734393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16140190A Pending JPH0452232A (en) | 1990-06-21 | 1990-06-21 | Continuous heat treatment for steel strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0452232A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100567910B1 (en) * | 2001-11-02 | 2006-04-05 | 주식회사 포스코 | Appratus for perfect combustion of exhaust gas of direct fired furnace |
-
1990
- 1990-06-21 JP JP16140190A patent/JPH0452232A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100567910B1 (en) * | 2001-11-02 | 2006-04-05 | 주식회사 포스코 | Appratus for perfect combustion of exhaust gas of direct fired furnace |
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