JPH0257123B2 - - Google Patents
Info
- Publication number
- JPH0257123B2 JPH0257123B2 JP18040383A JP18040383A JPH0257123B2 JP H0257123 B2 JPH0257123 B2 JP H0257123B2 JP 18040383 A JP18040383 A JP 18040383A JP 18040383 A JP18040383 A JP 18040383A JP H0257123 B2 JPH0257123 B2 JP H0257123B2
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- exhaust gas
- amount
- exhaust
- refining
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
- C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Description
【発明の詳細な説明】
〔本発明の技術分野〕
本発明は、連続製鋼炉、特に樋形連続製鋼炉に
おける排ガス処理装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an exhaust gas treatment device in a continuous steel making furnace, particularly in a trough-type continuous steel making furnace.
一般的な樋形連続製鋼炉は第１図に示すよう
に、炉本体１と炉蓋８とから構成されている。炉
本体１は前後端に受湯口２及び出湯口３を有し、
内面に耐火材４を内張りして樋形状とした密閉炉
であり、途中に耐火材の堰５を設け、反応槽６と
鎮静槽７に分割し、鎮静槽７には排滓口１２を設
けている。
As shown in FIG. 1, a typical trough-type continuous steelmaking furnace is composed of a furnace body 1 and a furnace lid 8. The furnace body 1 has a receiving port 2 and a tapping port 3 at the front and rear ends,
It is a closed furnace in the shape of a gutter with the inner surface lined with refractory material 4. A refractory material weir 5 is installed in the middle to divide it into a reaction tank 6 and a calming tank 7, and the calming tank 7 is provided with a slag discharge port 12. ing.
一方炉蓋８には、造滓剤投入口１１及び排気口
１０を設けており、炉体同様耐火材９で内張りさ
れていて、上方から複数本の酸素ランス１３が炉
内に挿入できる構造としている。 On the other hand, the furnace lid 8 is provided with a sludge inlet 11 and an exhaust port 10, and is lined with a refractory material 9 like the furnace body, and has a structure that allows multiple oxygen lances 13 to be inserted into the furnace from above. There is.
溶銑１４は受湯口２から連続的に供給され、反
応槽６において、酸素ランス１３によつて上方か
ら、高圧酸素１８が吹込まれ、酸化反応が行なわ
れ、銑鉄成分のものが鋼成分のものに変る。同時
に造滓剤１６が投入口１１から、炉内反応槽６に
連続的に供給されており、滓化してスラグ１７と
なり、ランス保護及び精錬反応を行い、役目の終
つたスラグ１７は排滓口１２から排出される。 Hot metal 14 is continuously supplied from the inlet 2, and in the reaction tank 6, high-pressure oxygen 18 is blown from above by an oxygen lance 13 to carry out an oxidation reaction, changing the pig iron component to the steel component. Change. At the same time, a slag-forming agent 16 is continuously supplied from the inlet 11 to the reactor tank 6 in the furnace, and is turned into slag 17, which performs a lance protection and refining reaction. It is discharged from 12.
溶鋼は反応槽６から鎮静槽７に流入し、スラグ
１７との分離を行い出湯口３から溶鋼１５として
連続的に出鋼される。一方炉内においては、純酸
素１８による脱炭反応によりCOガスを主体とし
た多量の精錬排ガス１９が発生し、排気口１０か
ら排出される。 The molten steel flows into the calming tank 7 from the reaction tank 6, is separated from the slag 17, and is continuously tapped as molten steel 15 from the tapping port 3. On the other hand, inside the furnace, a large amount of refining exhaust gas 19 mainly consisting of CO gas is generated due to the decarburization reaction caused by pure oxygen 18, and is discharged from the exhaust port 10.
従来の上記製鋼炉における排気系統では、上記
精錬排ガス１９の排気方法に問題がある。すなわ
ち、通常の排気系統は第１図に示すように、排気
フード及びダクト２０′バツクフイルタ２２、排
気フアン２３及び煙突２４とから構成されてい
て、精錬排ガス１９は、うすめ空気と共に排気ガ
ス１９′として排気フード２０に吸引され、バツ
クフイルタ２２で集塵された後、排気フアン２３
で吸引されつつ煙突２４から排気される。この場
合、吸引する排ガス量が多すぎると炉内が極端な
負圧となり、外の空気が炉内に吸引され、炉内で
精錬排ガス１９が燃焼して、高温になつて、耐火
物寿命が短くなり、又逆に少なすぎると、精錬排
ガス１９が炉外に洩れ、いわゆる炉気吹出しによ
り、操業ができなくなる。
In the conventional exhaust system in the above-mentioned steelmaking furnace, there is a problem in the method of exhausting the above-mentioned refining exhaust gas 19. That is, as shown in FIG. 1, a normal exhaust system is composed of an exhaust hood and duct 20', a back filter 22, an exhaust fan 23, and a chimney 24, and the refined exhaust gas 19 is discharged as exhaust gas 19' together with thin air. After being sucked into the exhaust hood 20 and collected by the back filter 22, the exhaust fan 23
It is exhausted from the chimney 24 while being sucked in. In this case, if the amount of exhaust gas to be sucked is too large, the inside of the furnace will become extremely negative pressure, outside air will be sucked into the furnace, the refining exhaust gas 19 will be burned in the furnace, the temperature will increase, and the life of the refractory will be shortened. If it becomes too short, or conversely if it is too small, the refining exhaust gas 19 will leak out of the furnace, causing so-called furnace air blow-out, making it impossible to operate.
したがつて、従来は、炉内圧力を微圧計２９で
検出して、ダンパ２１の開度を調節して、排ガス
吸引量を制御していた。しかし、この方法では、
精錬排ガス１９が非常に温度が高く、ダストが多
く含まれるため、炉内圧を検出する微圧計２９の
信頼性が悪く、満足して使用できなかつた。 Therefore, conventionally, the pressure inside the furnace was detected by a micropressure gauge 29, and the opening degree of the damper 21 was adjusted to control the exhaust gas suction amount. However, with this method,
Since the refining exhaust gas 19 had a very high temperature and contained a lot of dust, the low pressure gauge 29 for detecting the furnace internal pressure had poor reliability and could not be used satisfactorily.
そこで、本発明は、上記した欠点を有する微圧
計を使用せずに、排ガス吸引量を簡単に制御でき
る連続製鋼炉における排ガス処理装置を提供する
ことを目的とする。
SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an exhaust gas treatment device for a continuous steelmaking furnace that can easily control the exhaust gas suction amount without using a micropressure gauge having the above-mentioned drawbacks.
そして、本発明は、上記目的を達成する手段と
して、酸素吹込量に比例して排ガスの吸引量を調
節する制御回路を設けた点にある。すなわち、本
発明は、連続製鋼炉内で発生する精錬排ガスを吸
引、排気する装置において、排ガスの吸引量を、
連続製鋼炉の酸素吹込量に比例して増減する制御
回路を設けたことを特徴とする連続製鋼炉におけ
る排ガス処理装置である。
As a means for achieving the above object, the present invention is provided with a control circuit that adjusts the amount of exhaust gas sucked in proportion to the amount of oxygen blown. That is, the present invention provides an apparatus for sucking and exhausting refining exhaust gas generated in a continuous steelmaking furnace, in which the amount of exhaust gas sucked is
This is an exhaust gas treatment device for a continuous steelmaking furnace, characterized by being provided with a control circuit that increases or decreases in proportion to the amount of oxygen blown into the continuous steelmaking furnace.
本発明は、精錬排ガスの発生量が、純酸素の吹
込量に比例することに着目し、酸素吹込量の増減
に応じて、ダンパ開度を調節し、排ガス吸引量を
制御するようにしたものである。そして、本発明
において、排ガスの吸引量を制御するダンパは、
排気ガスのダクト内に配設しても良く、また、バ
ツクフイルタと排気フアンとの間に配設すること
もできる。また、本発明において、排ガス吸引量
を制御するために、排気フアンの回転数を制御し
たり、ベーン角度を調節して、排風量を制御する
こともできるものである。 The present invention focuses on the fact that the amount of refining exhaust gas generated is proportional to the amount of pure oxygen blown in, and the damper opening degree is adjusted in accordance with the increase or decrease in the amount of oxygen blown in to control the amount of exhaust gas suction. It is. In the present invention, the damper that controls the suction amount of exhaust gas is
It may be disposed within the exhaust gas duct, or it may be disposed between the back filter and the exhaust fan. Further, in the present invention, in order to control the exhaust gas suction amount, the exhaust air amount can be controlled by controlling the rotation speed of the exhaust fan or adjusting the vane angle.
以下、第２図に基づいて本発明を詳細に説明す
る。第２図は本発明の実施例である連続製鋼炉に
おける排ガス処理装置を示す図であつて、従来の
連続製鋼炉を図示した第１図と同一部分には同一
付号が付与されている。そこで、第１図の従来の
製鋼炉との共通個所を省略して説明すると、精錬
排ガス１９は排気フード２０、排気ダクト２０′
を通り、バツクフイルタ２２等の集塵機を介して
排気フアン２３で吸引され、煙突２４から排気さ
れる。排気ダクト２０′の途中には風量調整ダン
パ２１を設け、サーボモータ２８により、開度を
調節し、排ガス吸引量を制御する。一方、酸素ラ
ンス１３に供給される純酸素１８の量は、オリフ
イス２５によつて検出し、指示計２６に指示され
ている。このような排気系統において、調節計２
７を設け、酸素供給量の変化を入力とし、サーボ
モータ２８によつて、ダンパ２１の開度を自動的
に調節する制御回路を設け、酸素吹込量に応じ
て、排ガスの吸引量を制御する。この結果精錬炉
の炉内をほぼ一定の圧力状態に維持することがで
き、過剰な空気の流入及び炉気吹出しが防止で
き、精錬炉の安定操業が可能となる。 Hereinafter, the present invention will be explained in detail based on FIG. 2. FIG. 2 is a diagram showing an exhaust gas treatment device in a continuous steel making furnace according to an embodiment of the present invention, and the same parts as in FIG. 1, which shows a conventional continuous steel making furnace, are given the same numbers. Therefore, to explain the parts common to the conventional steelmaking furnace shown in FIG.
The air passes through a dust collector such as a back filter 22, is sucked in by an exhaust fan 23, and is exhausted from a chimney 24. An air volume adjusting damper 21 is provided in the middle of the exhaust duct 20', and a servo motor 28 adjusts the opening degree to control the exhaust gas suction amount. On the other hand, the amount of pure oxygen 18 supplied to the oxygen lance 13 is detected by an orifice 25 and indicated by an indicator 26. In such an exhaust system, controller 2
7 is provided, and a control circuit is provided which receives changes in the amount of oxygen supply as input and automatically adjusts the opening degree of the damper 21 using the servo motor 28, thereby controlling the amount of suction of exhaust gas according to the amount of oxygen blown. . As a result, the inside of the refining furnace can be maintained at a substantially constant pressure state, preventing excessive air from entering and blowing out of the furnace, and allowing stable operation of the refining furnace.
本発明は、以上詳記したように、酸素吹精量の
変化に応じて排ガスの吸引量を調節する制御回路
を設けたものであり、炉内に特別な検出端を使用
しないため、故障が少く信頼性が高いことと、精
錬炉の一時停止時、すなわち、酸素吹込を停止し
た時には、自動的にダンパが全閉となり、排ガス
の吸引が停止し、炉内への冷空気の侵入がなくな
り、炉内溶鋼、スラグの熱放散及び耐火材の急冷
によるスポーリングが防止できる効果が生ずるも
のである。
As described in detail above, the present invention is equipped with a control circuit that adjusts the suction amount of exhaust gas according to changes in the amount of oxygen blown, and since no special detection end is used in the furnace, there is no possibility of failure. In addition, when the refining furnace is temporarily stopped, that is, when oxygen injection is stopped, the damper is automatically fully closed, stopping the suction of exhaust gas and preventing cold air from entering the furnace. This has the effect of preventing spalling due to heat dissipation of the molten steel and slag in the furnace and rapid cooling of the refractory material.
第１図は従来の樋形連続製鋼炉を示し、第２図
は本発明の実施例である連続製鋼炉における排ガ
ス処理装置を示す。
１……炉本体、２……受湯口、３……出湯口、
４……耐火材、５……堰、６……反応槽、７……
鎮静槽、８……炉蓋、９……耐火材、１０……排
気口、１１……造滓剤投入口、１２……排滓口、
１３……酸素ランス、１４……溶銑、１５……溶
鋼、１６……造滓剤、１７……スラグ、１８……
純酸素、１９……精錬排ガス、１９′……排気ガ
ス、２０……排気フード、２０′……ダクト、２
１……ダンパ、２２……バツクフイルタ、２３…
…排気フアン、２４……煙突、２５……オリフイ
ス、２６……指示計、２７……調節計、２８……
サーボモータ、２９……微圧計。
FIG. 1 shows a conventional trough-type continuous steel making furnace, and FIG. 2 shows an exhaust gas treatment device in a continuous steel making furnace which is an embodiment of the present invention. 1... Furnace body, 2... Inlet, 3... Outlet,
4... refractory material, 5... weir, 6... reaction tank, 7...
Sedation tank, 8... Furnace cover, 9... Refractory material, 10... Exhaust port, 11... Slag forming agent inlet, 12... Slag discharge port,
13... Oxygen lance, 14... Hot metal, 15... Molten steel, 16... Slag forming agent, 17... Slag, 18...
Pure oxygen, 19... Refining exhaust gas, 19'... Exhaust gas, 20... Exhaust hood, 20'... Duct, 2
1... Damper, 22... Back filter, 23...
...Exhaust fan, 24...Chimney, 25...Orifice, 26...Indicator, 27...Controller, 28...
Servo motor, 29...low pressure gauge.
Claims (1)
排気する装置において、排ガスの吸引量を、連続
製鋼炉の酸素吹込量に比例して増減する制御回路
を設けたことを特徴とする連続製鋼炉における排
ガス処理装置。1 Suction of refining exhaust gas generated in a continuous steelmaking furnace,
1. An exhaust gas treatment device for a continuous steel making furnace, characterized in that the exhaust device is provided with a control circuit that increases or decreases the amount of sucked exhaust gas in proportion to the amount of oxygen blown into the continuous steel making furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18040383A JPS6075508A (en) | 1983-09-30 | 1983-09-30 | Treating device for waste gas in continuous steel making furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18040383A JPS6075508A (en) | 1983-09-30 | 1983-09-30 | Treating device for waste gas in continuous steel making furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6075508A JPS6075508A (en) | 1985-04-27 |
| JPH0257123B2 true JPH0257123B2 (en) | 1990-12-04 |
Family
ID=16082629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18040383A Granted JPS6075508A (en) | 1983-09-30 | 1983-09-30 | Treating device for waste gas in continuous steel making furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6075508A (en) |
-
1983
- 1983-09-30 JP JP18040383A patent/JPS6075508A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6075508A (en) | 1985-04-27 |
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