JPH0225407B2 - - Google Patents
Info
- Publication number
- JPH0225407B2 JPH0225407B2 JP19581484A JP19581484A JPH0225407B2 JP H0225407 B2 JPH0225407 B2 JP H0225407B2 JP 19581484 A JP19581484 A JP 19581484A JP 19581484 A JP19581484 A JP 19581484A JP H0225407 B2 JPH0225407 B2 JP H0225407B2
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- pressure
- converter
- waste gas
- 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.)
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Description
〔発明の属する技術分野〕
この発明は、転炉廃ガス処理装置（OG）にお
ける炉圧補償方法に関するものである。
〔従来技術とその問題点〕
従来の転炉廃ガス処理装置においては、炉口部
の上部に位置するスカートを炉口部に密着させる
事なく操業していた。それ故、炉圧は約プラス、
マイナス数mmH2O（水柱）の範囲に入つていた。
しかし、スカートを下げ炉口部を密着ないしそれ
に近い方法で操業する時に何らかの原因で大きな
外乱を受けると、炉圧はプラス、マイナス数百mm
H2Oに達し、このため、転炉廃ガス処理装置の
本体保護の点からも好ましくない結果となる。例
えば、ガスシール装置のシール切れを生じさせた
り、ダクト本体へ過剰なストレスが加わつたりす
る。
〔発明の目的〕
この発明は、かかる点に鑑みてなされたもの
で、炉内圧が各該設定値の範囲外になれば、それ
に対応した処理を行なうことにより、炉内圧を所
定範囲内に入るように補償し、その安全を図るこ
とを目的とする。
〔発明の要点〕
この発明は、転炉廃ガス処理装置において、炉
内圧を所定の範囲内に抑えるために、炉内圧に対
応した複数個の設定値を予め決めておく一方、炉
内圧を一定周期で監視し、これが各設定値を越え
たときそれと対応する炉内圧復圧処理を行なうよ
うにしたものである。
〔発明の実施例〕
図はこの発明の実施例を説明するための転炉廃
ガス処理装置の１例を示す構成図である。同図に
おいて、１は転炉、２は溶銑およびスクラツプ、
３は上吹ランス、４はスカート、５は外側シー
ル、６は炉内圧発信器、７はフード部、８は制御
用N2（窒素）弁、９は空気吸入弁、１０は上部安
全弁、１１−１は１次集塵器、１１−２は２次集
塵器、１２はダンパ、１３は電油操縦機、１４は
バイパス弁、１５は誘引送風機（IDF）、１６は
炉内圧制御装置、１７は非常N2弁である。
転炉１の中に主原料としてスクラツプ、溶銑２
を装入し、転炉上部からランス３を用いて高圧酸
素を吹込み、溶銑を精練して溶鋼にする。この事
を吹練という。吹練中に、酸素は溶銑中の炭素と
化合し、COガスを主成分とする廃ガスを発生す
る。この廃ガスは、約1200℃の高温であり、約
150ｇ／Ｎm3という多量の酸化鉄系ダストを含ん
でいる。この廃ガスは高温であるから、装置本体
を保護するためフード部７は水冷管にて水冷され
ている。一方、この廃ガス中のダストを除去する
ために１次集塵器（1DC）１１−１、２次集塵器
（2DC）１１−２が設けられている。これらの集
塵器は集塵水を用いた方式であるため、廃ガスは
急冷されて温度は約70℃まで下がる。廃ガスから
除塵をするためには、先に述べた２つの集塵器に
ところでガスを高速で通過させる必要があり、各
集塵器１１−１，１１−２にはダンパ１２を備
え、絞り機構となつている。又、ガス吸引は誘引
送風機（IDF）１５によつて行なわれる。炉口部
のガス圧力は炉内圧力（炉内圧）と呼ばれ、炉内
圧検出器６で検出されるとともに、炉内圧制御装
置１６を用いて２次集塵器１１−２内のダンパ１
２を動かすことにより制御される。なお、このダ
ンパの駆動装置には通常、電油操縦機１３が使用
されている。この炉内圧は通常大気圧近くに制御
され、炉口部とスカート４とのすき間からガスが
吹出したり、大気を吸引したりする量をできるか
ぎり少なくなる様にしている。通常、スカート４
と炉口のすき間が200mm位であれば、炉内圧はプ
ラス、マイナス数mmH2Oの間で制御される。し
かしスカート４を下げ、更に外側シール５と呼ば
れるスカートを炉体に密着させる装置を動作させ
ると、炉口部のすき間はほとんど無くなる。この
ような密閉状態で操業すると、炉圧の振れ幅は大
きくなり、異常時にはプラス、マイナス数百mm
H2Oになり得る。このため、制御性を向上させ
るべく炉内圧制御装置１６には種々の工夫がされ
ているのが普通である。しかしながら、非常に大
きな外乱、例えば炉内発生ガス量の急激な増加ま
たは減少があると、炉内圧は急激に増加または減
少する。
したがつて、この発明ではかかる炉内圧力の異
常正圧、異常負圧を防止するために、炉内圧力に
数段階の設定値（以下、バンド幅とも呼ぶ。）を
設け、このバンド幅を越えたら、各バンド幅に対
応した処理を行なうことにより、炉内圧力を大気
圧レベルまで復圧させるようにする。
以下、この発明の復圧操作方法の１例について
説明する。なお、記号PHH3〜PLL3は、それぞ
れの設定値を示している。
(イ) PHH3を越えた（以上になつた）とき
OGダクト中に設けられた上部安全弁１０を
開け、ダクト内のガスを外部に逃し、炉内圧を
下げる。
(ロ) PHH2を越えたとき
スカート４を１mmだけ上昇し、炉内のガスを
外部に逃し、炉内圧を下げる。
(ハ) PHH1を越えたとき
スカート４をＨmm（Ｈ＜Ｉ）だけ上昇し、炉
内のガスを外部に逃し、炉内圧を下げる。
(ニ) PH3を越えたとき
２次集塵器（2DC）１１−２をバイパスする
ダクトに設けた遮断弁１４を開き、２次集塵器
前のガスを２次集塵器後に流すこと（バイパス
させること）により、炉口迄のガス量を減ら
し、炉内圧を下げる。なお、２次集塵器１１−
２のかわりに、１次集塵器１１−１においてこ
れと同様の操作を行なうことができる。
(ホ) PH2を越えたとき
炉内圧を制御している操作端（2DCダンパ）
１２をΔKHHの開度だけ開き、２次集塵器前の
ガスを後に逃がし、炉内圧を下げる。
(ヘ) PH1を越えたとき
PH2と同様にΔKH（ΔKH＜ΔKHH）の開度だけ
開き、炉内圧を下げる。
(ト) PL1を越えた（以下になつた）とき
PH2、PH1の処理とは逆に2DCダンパ１２
をΔKHの開度だけ閉め、２次集塵器１１−２の
流路を狭くして、炉内圧を上げる。
(チ) PL2を越えたとき
PL1と同様に、ΔKHHの開度だけ閉め、炉内
圧を上げる。
(リ) PL3を越えたとき
炉口部に比較的流路の狭い配管で制御用N2
弁８を開いてN2（窒素ガス）を吹き込み、炉口
内ガス量を増し、炉内圧を上げる。
(ヌ) PLL0を越えたとき
外側シール５を開き、外部から空気を炉口内
に吸い込み、炉口内ガス量を増し、炉内圧を上
げる。
(ル) PLL1を越えたとき
スカート４をＨmmだけ上昇し、外部から空気
を炉口内に吸い込み、炉口内ガス量を増し、炉
内圧を上げる。
(オ) PLL2を越えたとき
スカート４をＩmmだけ上昇し、外部から空気
を炉口内に吸い込み、炉口内ガス量を増し、炉
内圧を上げる。また、炉口上部に設けられてい
る比較的流路の広い配管の非常N2弁１７を開
いてN2を吹き込み、炉内圧を上げる。更に、
炉口上部の空気吸入弁９を開き、外部から空気
を吸い込み、炉内圧を上げる。
(ワ) PLL3を越えたとき、
誘引送風機（IDF）１５を停止し、炉口内お
よびダクト内のガスの減少を防ぎ、炉内圧の低
下を抑える。
このように、炉内圧力の値により、炉口内及び
ダクト内のガスを適宜に増加又は、減少させ、復
圧を行なう。なお、以上の如き炉内圧設定値とそ
の復圧処理との対応関係をまとめると表の如くな
る。
[Technical field to which the invention pertains] The present invention relates to a furnace pressure compensation method in a converter waste gas treatment device (OG). [Prior art and its problems] Conventional converter waste gas treatment equipment operates without bringing the skirt located above the furnace mouth into close contact with the furnace mouth. Therefore, the furnace pressure is approximately positive,
It was within the range of minus several mmH 2 O (water column).
However, when operating with the skirt lowered and the furnace mouth in close contact, or in a similar manner, if large disturbances occur for some reason, the furnace pressure will increase or decrease by several hundred millimeters.
H 2 O, which is unfavorable from the standpoint of protecting the converter waste gas treatment equipment. For example, this may cause the gas seal device to break, or excessive stress may be applied to the duct body. [Purpose of the Invention] This invention has been made in view of the above points, and is capable of bringing the furnace pressure within a predetermined range by performing corresponding processing when the furnace pressure falls outside the range of each set value. The purpose is to provide compensation and ensure safety. [Summary of the Invention] This invention provides a converter waste gas treatment system in which a plurality of set values corresponding to the furnace pressure are determined in advance in order to suppress the furnace internal pressure within a predetermined range, and the furnace pressure is kept constant. The pressure is monitored periodically, and when the value exceeds each set value, the corresponding pressure recovery process in the furnace is performed. [Embodiment of the Invention] The figure is a configuration diagram showing an example of a converter waste gas treatment apparatus for explaining an embodiment of the invention. In the figure, 1 is a converter, 2 is hot metal and scrap,
3 is a top blow lance, 4 is a skirt, 5 is an outer seal, 6 is a furnace pressure transmitter, 7 is a hood part, 8 is a control N 2 (nitrogen) valve, 9 is an air intake valve, 10 is an upper safety valve, 11 -1 is a primary precipitator, 11-2 is a secondary precipitator, 12 is a damper, 13 is an electrohydraulic control device, 14 is a bypass valve, 15 is an induced fan (IDF), 16 is a furnace pressure control device, 17 is the emergency N2 valve. Converter 1 contains scrap and hot metal 2 as main raw materials.
is charged, and high-pressure oxygen is blown into the converter using a lance 3 from the top of the converter to refine the hot metal into molten steel. This is called blowing training. During blowing, oxygen combines with carbon in the hot metal, producing waste gas consisting mainly of CO gas. This waste gas has a high temperature of approximately 1200℃, and is approximately
It contains a large amount of iron oxide dust of 150g/ Nm3 . Since this waste gas has a high temperature, the hood part 7 is water-cooled with a water-cooled pipe to protect the main body of the apparatus. On the other hand, a primary dust collector (1DC) 11-1 and a secondary dust collector (2DC) 11-2 are provided to remove dust from this waste gas. Since these dust collectors use dust-collecting water, the waste gas is rapidly cooled down to a temperature of approximately 70°C. In order to remove dust from waste gas, it is necessary to pass the gas through the two dust collectors mentioned above at high speed, and each dust collector 11-1, 11-2 is equipped with a damper 12, It has become a mechanism. Further, gas suction is performed by an induced fan (IDF) 15. The gas pressure at the furnace mouth is called furnace pressure (furnace pressure), and is detected by the furnace pressure detector 6, and the furnace pressure control device 16 is used to control the damper 1 in the secondary precipitator 11-2.
It is controlled by moving 2. Note that an electro-hydraulic control device 13 is normally used as a drive device for this damper. The pressure inside the furnace is usually controlled to be close to atmospheric pressure, so that the amount of gas blown out from the gap between the furnace mouth and the skirt 4 and the amount of air sucked in are minimized. Usually skirt 4
If the gap between the furnace opening and the furnace opening is about 200 mm, the furnace pressure will be controlled between plus and minus several mmH 2 O. However, if the skirt 4 is lowered and a device called an outer seal 5 that brings the skirt into close contact with the furnace body is operated, the gap at the furnace mouth will almost disappear. When operating in such a closed condition, the fluctuation of the furnace pressure becomes large, and in the event of an abnormality, the pressure may vary by several hundred millimeters.
Can be H2O . For this reason, it is common for the furnace internal pressure control device 16 to be devised in various ways to improve controllability. However, if there is a very large disturbance, such as a sudden increase or decrease in the amount of gas generated in the furnace, the pressure in the furnace will suddenly increase or decrease. Therefore, in this invention, in order to prevent such abnormal positive pressure and abnormal negative pressure in the furnace pressure, several levels of set values (hereinafter also referred to as band widths) are provided for the furnace pressure, and this band width is set. If the pressure exceeds the threshold, the pressure inside the furnace is restored to the atmospheric pressure level by performing processing corresponding to each band width. An example of the pressure recovery operation method of the present invention will be described below. Note that symbols PHH3 to PLL3 indicate respective setting values. (b) When PHH3 is exceeded (becomes more than) Open the upper safety valve 10 installed in the OG duct, release the gas in the duct to the outside, and lower the pressure inside the furnace. (b) When PHH2 is exceeded, raise the skirt 4 by 1mm to release the gas inside the furnace to the outside and lower the pressure inside the furnace. (c) When PHH1 is exceeded Raise skirt 4 by Hmm (H<I) to release gas inside the furnace to the outside and lower the pressure inside the furnace. (d) When PH3 is exceeded, open the shutoff valve 14 installed in the duct that bypasses the secondary precipitator (2DC) 11-2, and allow the gas before the secondary precipitator to flow after the secondary precipitator ( By bypassing), the amount of gas up to the furnace mouth is reduced and the pressure inside the furnace is lowered. In addition, the secondary dust collector 11-
2, a similar operation can be performed in the primary dust collector 11-1. (E) When PH2 is exceeded The operating end (2DC damper) that controls the furnace internal pressure
12 is opened by the opening degree of ΔK HH , the gas in front of the secondary precipitator is released to the rear, and the pressure inside the furnace is lowered. (f) When PH1 is exceeded, similarly to PH2, open by ΔK H (ΔK H < ΔK HH ) to lower the pressure inside the furnace. (g) When PL1 is exceeded (below), the 2DC damper 12
is closed by an opening of ΔK H , the flow path of the secondary precipitator 11-2 is narrowed, and the pressure inside the furnace is increased. (h) When PL2 is exceeded Similar to PL1, close the opening by ΔK HH and increase the furnace pressure. (li) When exceeding PL3 Contain N2 for control using piping with a relatively narrow flow path at the furnace mouth.
Open valve 8 and blow in N 2 (nitrogen gas) to increase the amount of gas inside the furnace mouth and raise the pressure inside the furnace. (NU) When PLL0 is exceeded Open the outer seal 5 and suck air from the outside into the furnace mouth, increasing the amount of gas inside the furnace mouth and raising the furnace pressure. (Le) When PLL1 is exceeded, raise skirt 4 by Hmm, suck air from outside into the furnace mouth, increase the amount of gas inside the furnace mouth, and raise the furnace pressure. (e) When PLL2 is exceeded, raise skirt 4 by Imm, suck air from outside into the furnace mouth, increase the amount of gas inside the furnace mouth, and raise the furnace pressure. Additionally, the emergency N 2 valve 17 of the piping with a relatively wide flow path provided above the furnace mouth is opened to blow in N 2 to raise the pressure inside the furnace. Furthermore,
Open the air suction valve 9 at the top of the furnace mouth to suck in air from outside to increase the pressure inside the furnace. (W) When PLL3 is exceeded, the induced draft fan (IDF) 15 is stopped to prevent a decrease in the gas inside the furnace mouth and duct, and to suppress the drop in pressure inside the furnace. In this way, depending on the value of the pressure inside the furnace, the gas inside the furnace mouth and inside the duct is increased or decreased as appropriate to restore the pressure. The table below summarizes the correspondence between the furnace internal pressure set value and the pressure recovery process as described above.
この発明によれば、炉内圧力が異常に高くなる
時、または低くなる時に、その時の炉内圧力の値
により、復圧能力の低い処理から高い処理まで各
段階に応じた復圧処理を行なうようにしているの
で、プラント（転炉廃ガス処理装置）の操業を可
能な限り継続し、且つプラントの損傷を防ぐこと
ができる効果がもたらされる。
According to this invention, when the pressure in the furnace becomes abnormally high or low, depressurization treatment is performed according to each stage from treatment with low depressurization capacity to treatment with high depressurization capacity, depending on the value of the pressure in the furnace at that time. As a result, the operation of the plant (converter waste gas treatment equipment) can be continued as much as possible, and damage to the plant can be prevented.
図はこの発明の実施例を説明するための転炉廃
ガス処理装置のプラント説明図である。
符号説明、１……転炉、２……スクラツプ、溶
銑、３……上吹ランス、４……スカート、５……
外側シール、６……炉内圧発信器、７……フード
部、８……制御用N2弁、９……空気吸入弁、１
０……上部安全弁、１１−１……１次集塵器、１
１−２……２次集塵器、１２……ダンパ、１３…
…電油操縦機、１４……2DCバイパス弁、１５…
…誘引送風機、１６……炉内圧制御装置、１７…
…非常N2弁。
The figure is a plant explanatory diagram of a converter waste gas treatment apparatus for explaining an embodiment of the present invention. Description of symbols, 1... Converter, 2... Scrap, hot metal, 3... Top blowing lance, 4... Skirt, 5...
Outer seal, 6...furnace pressure transmitter, 7...hood section, 8...control N2 valve, 9...air suction valve, 1
0... Upper safety valve, 11-1... Primary dust collector, 1
1-2... Secondary dust collector, 12... Damper, 13...
...Electrohydraulic control aircraft, 14...2DC bypass valve, 15...
...Induced blower, 16...Furnace pressure control device, 17...
…Emergency N 2 valves.
Claims (1)
略同等の状態にして転炉からの廃ガスを回収、処
理する転炉廃ガス処理装置において、転炉の炉内
圧を所定の周期をもつて監視する一方、該炉内圧
に対する複数の設定値を予め段階的に設定してお
き、炉内圧検出値を該各設定値と比較し該検出さ
れた炉内圧がいずれの設定値を越えるかにより、
それと対応して廃ガスの増、減量を調整する所定
の炉内圧復圧処理を行なうことを特徴とする転炉
廃ガス処理装置の操業方法。1 In a converter waste gas treatment device that collects and processes waste gas from a converter by keeping the converter mouth and skirt sealed or in a substantially equivalent state, the converter internal pressure is adjusted to a predetermined period. At the same time, a plurality of set values for the furnace internal pressure are set in advance in stages, and the detected value of the furnace internal pressure is compared with each of the set values to determine which set value the detected furnace internal pressure exceeds. ,
A method for operating a converter waste gas treatment apparatus, characterized in that a predetermined furnace pressure recovery process is performed to adjust the increase or decrease of waste gas in response to this.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19581484A JPS6173808A (en) | 1984-09-20 | 1984-09-20 | Operating method of waste gas treating device for converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19581484A JPS6173808A (en) | 1984-09-20 | 1984-09-20 | Operating method of waste gas treating device for converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6173808A JPS6173808A (en) | 1986-04-16 |
| JPH0225407B2 true JPH0225407B2 (en) | 1990-06-04 |
Family
ID=16347429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19581484A Granted JPS6173808A (en) | 1984-09-20 | 1984-09-20 | Operating method of waste gas treating device for converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6173808A (en) |
-
1984
- 1984-09-20 JP JP19581484A patent/JPS6173808A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6173808A (en) | 1986-04-16 |
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