JP2000005538A - Waste gas treating device of arc furnace - Google Patents
Waste gas treating device of arc furnaceInfo
- Publication number
- JP2000005538A JP2000005538A JP10189893A JP18989398A JP2000005538A JP 2000005538 A JP2000005538 A JP 2000005538A JP 10189893 A JP10189893 A JP 10189893A JP 18989398 A JP18989398 A JP 18989398A JP 2000005538 A JP2000005538 A JP 2000005538A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- waste gas
- tower
- combustion
- arc furnace
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- 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)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、アーク炉から排出
される排ガスの排出通路に設けられダイオキシン等の有
害物質の排出を防止する排ガス処理装置に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas treatment apparatus provided in a discharge passage for exhaust gas discharged from an arc furnace to prevent discharge of harmful substances such as dioxin.
【０００２】[0002]
【従来の技術】製鋼，焼却灰溶融等に用いられるアーク
炉の排ガス通路にはダストを捕集するために従来からバ
グフィルタが設けられ、該バグフィルタの上流側には排
ガス温度をそのバグの耐熱温度以下に下げるために冷却
設備が設けられて排ガスを１００℃〜２５０℃程度に冷
却させている。2. Description of the Related Art A bag filter is conventionally provided in an exhaust gas passage of an arc furnace used for steel making, melting of incinerated ash, etc. for collecting dust, and an exhaust gas temperature is provided upstream of the bag filter. Cooling equipment is provided to lower the temperature to below the heat resistant temperature to cool the exhaust gas to about 100 to 250 ° C.
【０００３】また、排ガス中に含まれるダイオキシン等
の塩素系有害物質は、排ガスを９００℃以上の温度に２
秒間以上保持することにより分解し、その後３００℃以
下に急冷することにより再生成が抑えられる。そこで、
図３に示したように、アーク炉１の排ガス通路２に燃焼
塔３とスプレー塔４とバグフィルタ５をその順に設け、
該燃焼塔に設けられたバーナ６によって排ガスを９００
℃以上に加熱した後、スプレー塔４における散水により
該排ガスを３００℃以下に急冷させる排ガス処理装置が
従来から知られている。[0003] Chlorine-based harmful substances such as dioxin contained in flue gas can reduce flue gas to a temperature of 900 ° C or more.
It is decomposed by holding for more than one second, and then rapidly cooled to 300 ° C. or less to suppress regeneration. Therefore,
As shown in FIG. 3, a combustion tower 3, a spray tower 4, and a bag filter 5 are provided in the exhaust gas passage 2 of the arc furnace 1 in that order,
Exhaust gas is reduced to 900 by a burner 6 provided in the combustion tower.
An exhaust gas treatment apparatus for rapidly cooling the exhaust gas to 300 ° C. or less by spraying water in a spray tower 4 after heating the exhaust gas to at least 300 ° C. is conventionally known.
【０００４】[0004]
【発明が解決しようとする課題】ところで、アーク炉は
一般にバッチ式の操業形態が採られているので、精錬期
には１０００℃以上、時には１２００℃以上の高温度の
排ガスが排出されるが、材料装入時や溶解初期等には排
ガス温度が２００℃以下になるなど、排ガスの温度変動
幅が非常に大きいという特質がある。またアーク炉の操
業例えば通電の状況や酸素及びカーボンの使用などによ
り、非常に短時間に急激な排ガスの温度変動が起こる。
図４はその操業状態と排ガス温度の経緯を、図３中のＡ
点，Ｂ点，Ｃ点について、ダイオキシン濃度およびバー
ナ燃焼量，散水スプレー水量とともにグラフに示したも
のであるが、同図から分かるように、溶解期に燃焼塔３
におけるバーナ６の加熱能力を最大にし、また精錬期に
はスプレー塔４におけるスプレー水量を極度に増大させ
ることにより、ダイオキシンの発生が防がれるものであ
った。このためダイオキシン発生防止のために燃料，冷
却水等に多大な経費を必要としていた。またこのような
措置をしたとしても、アーク炉から排出される排ガスの
温度変動は急であるので、燃焼塔３におけるバーナ６の
燃焼量制御とスプレー塔４におけるスプレー７の水量制
御が追従できないため、燃焼塔における燃焼過剰または
燃焼不足あるいはスプレー塔における冷却過剰または冷
却不足が起こる。燃焼過剰となった時の問題の１つとし
て燃焼費の増大が揚げられ、燃焼不足となった時の問題
の１つとしてＢ点の温度が９００℃以下になることによ
りダイオキシンの分解が不十分となり、ダイオキシンが
残存してしまう。冷却過剰となった時の問題としてバグ
フィルタの結露やそれに伴う設備トラブルが、冷却不足
となった時の問題としてＣ点の温度が３００℃以上にな
ることによりダイオキシンの再生成が顕著になること、
また、バグフィルタ前での温度が２５０℃以上になるこ
とによりバグの過熱焼失等、急激な排ガスの温度変動に
起因する悪影響は大きい。By the way, since the arc furnace is generally operated in a batch system, high-temperature exhaust gas of 1000 ° C. or more, sometimes 1200 ° C. or more is discharged in the refining period. There is a characteristic that the temperature fluctuation range of the exhaust gas is extremely large, for example, the temperature of the exhaust gas becomes 200 ° C. or less at the time of charging the material or at the initial stage of melting. Further, due to the operation of the arc furnace, for example, the state of energization and the use of oxygen and carbon, the temperature of the exhaust gas rapidly changes in a very short time.
FIG. 4 shows the operating state and the history of the exhaust gas temperature in FIG.
The points, points B, and C are shown in a graph together with the dioxin concentration, the burner combustion amount, and the amount of spray water spray. As can be seen from FIG.
In this case, the generation of dioxin was prevented by maximizing the heating capacity of the burner 6 and by extremely increasing the amount of spray water in the spray tower 4 during the refining period. For this reason, large expenses were required for fuel, cooling water, etc. in order to prevent the generation of dioxins. Even if such measures are taken, the temperature fluctuation of the exhaust gas discharged from the arc furnace is sharp, so that the control of the combustion amount of the burner 6 in the combustion tower 3 and the control of the water amount of the spray 7 in the spray tower 4 cannot follow. Excessive or insufficient combustion in the combustion tower or excessive or insufficient cooling in the spray tower occurs. One of the problems when excessive combustion occurs is the increase in combustion cost. One of the problems when insufficient combustion occurs is the insufficient decomposition of dioxin due to the temperature at point B being 900 ° C or lower. And dioxin remains. Excessive cooling causes dew condensation on the bag filter and associated equipment troubles. When cooling is insufficient, the point C temperature rises to 300 ° C or higher, and re-generation of dioxin becomes prominent. ,
Further, when the temperature in front of the bag filter becomes 250 ° C. or higher, adverse effects due to rapid temperature fluctuation of exhaust gas such as overheating and burning of the bag are large.
【０００５】[0005]
【課題を解決するための手段】本発明は上記課題を解決
しようとするもので、アーク炉の排ガス通路に燃焼塔と
スプレー塔とバグフィルタをその順に設け、該燃焼塔に
設けられたバーナによって排ガスを加熱して９００℃以
上の温度に２秒間以上保持した後、スプレー塔における
散水により該排ガスを３００℃以下に急冷する排ガス処
理装置であって、燃焼塔およびその前後の排ガス通路に
排ガスの温度に従い蓄熱と放熱を繰り返す蓄熱材を内張
してなることを特徴とする。SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and comprises a combustion tower, a spray tower, and a bag filter provided in this order in an exhaust gas passage of an arc furnace, and a burner provided in the combustion tower. An exhaust gas treatment device for heating an exhaust gas to maintain it at a temperature of 900 ° C. or more for 2 seconds or more, and then rapidly cooling the exhaust gas to 300 ° C. or less by spraying water in a spray tower. It is characterized in that it is lined with a heat storage material that repeats heat storage and heat release according to temperature.
【０００６】[0006]
【発明の実施の形態】次に図面と共に本発明の実施の形
態を説明する。図１において、１はアーク炉、２は排ガ
ス通路、３は燃焼塔、４はスプレー塔、５はバグフィル
タ、６は該燃焼塔に設けられたバーナ、７はスプレー塔
４に設けられたスプレーノズルである。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, 1 is an arc furnace, 2 is an exhaust gas passage, 3 is a combustion tower, 4 is a spray tower, 5 is a bag filter, 6 is a burner provided in the combustion tower, and 7 is a spray provided in the spray tower 4. Nozzle.
【０００７】しかして本発明では、燃焼塔３およびその
前後の排ガス通路２を構成する鉄皮の内面に蓄熱材８を
張設する。なおこの蓄熱材８としては熱容量が大きい耐
火物，レンガ等を用いることができる。In the present invention, however, the heat storage material 8 is provided on the inner surface of the shell constituting the combustion tower 3 and the exhaust gas passage 2 before and after the combustion tower 3. The heat storage material 8 may be a refractory or a brick having a large heat capacity.
【０００８】このように構成された排ガス処理装置で
は、精錬期に排出される高温度の排ガスが排ガス通路２
を通過する際にその内面の畜熱材８を加熱し、溶解期や
材料装入時等に排出される比較的低温度の排ガスが該排
ガス通路２を通過する際に該畜熱材８によって加熱され
る。このため、図２に示したように図１のＡ点における
温度変動は非常に大きくとも、Ａ’点の温度変動は比較
的ゆるやかになり、燃焼塔３において該排ガスを９００
℃以上に加熱するに必要なバーナ燃焼量が軽減される。
また燃焼塔３内およびその流出側の排ガス通路２内にも
畜熱材８が張設されていることで、燃焼塔３を通過した
後の排ガス温度も安定し、これをスプレー塔４にて３０
０℃以下に急冷するのに要するスプレー水量もこのよう
に排ガスの温度が安定するのに伴い平均化されるので、
その応答性が従来のように問題となることもない。そし
て該スプレー塔４を通過した後のＣ点の排ガス温度を安
定的に２５０℃程度に急冷させることが可能となる。こ
のためダイオキシンが再生成されるのを防ぐとともに、
バグフィルタの結露を防止できる。[0008] In the exhaust gas treatment apparatus configured as described above, the high-temperature exhaust gas discharged during the refining period is supplied to the exhaust gas passage 2.
Heats the heat storage material 8 on its inner surface when passing through, so that the relatively low temperature exhaust gas discharged during the melting period or at the time of material charging passes through the exhaust gas passage 2 by the heat storage material 8. Heated. For this reason, as shown in FIG. 2, even though the temperature fluctuation at point A in FIG. 1 is very large, the temperature fluctuation at point A ′ becomes relatively gentle, and
The amount of burner combustion required for heating above ℃ is reduced.
Further, since the heat storage material 8 is also stretched in the combustion tower 3 and the exhaust gas passage 2 on the outflow side thereof, the temperature of the exhaust gas after passing through the combustion tower 3 is also stabilized. 30
Since the amount of spray water required for quenching to 0 ° C. or less is also averaged as the temperature of the exhaust gas is stabilized,
The responsiveness does not pose a problem as in the prior art. Then, the temperature of the exhaust gas at point C after passing through the spray tower 4 can be rapidly cooled to about 250 ° C. stably. This prevents dioxin from being regenerated,
Dew condensation on the bag filter can be prevented.
【０００９】[0009]
【発明の効果】このように本発明のアーク炉の排ガス処
理装置は、燃焼塔およびその前後の排ガス通路に排ガス
の温度に従い蓄熱と放熱を繰り返す蓄熱材を内張してな
るので、操業状態によって大きく変動する排ガスの温度
を平均化することができ、燃焼塔で必要とするバーナ燃
焼量およびスプレー塔で必要とするスプレー水量を減ら
してランニングコストを大幅に軽減させるとともに、ダ
イオキシンの生成防止およびバグフィルタの結露防止等
を容易ならしめる有益な効果がある。As described above, the exhaust gas treatment apparatus for an arc furnace according to the present invention is provided with a heat storage material which repeats heat storage and heat release in accordance with the temperature of the exhaust gas in the combustion tower and the exhaust gas passages before and after the combustion tower. It can average the temperature of exhaust gas which fluctuates greatly, reducing the amount of burner combustion required in the combustion tower and the amount of spray water required in the spray tower, greatly reducing running costs, preventing dioxin generation and preventing bugs. There is a beneficial effect that facilitates prevention of dew condensation on the filter.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明に係るアーク炉の排ガス処理装置の実施
形態を示した排ガス排出系統図。FIG. 1 is an exhaust gas discharge system diagram illustrating an embodiment of an exhaust gas treatment device for an arc furnace according to the present invention.
【図２】図１の排ガス処理装置の排ガス温度等の経時的
変動を示した図。FIG. 2 is a diagram showing a change over time of the exhaust gas temperature and the like of the exhaust gas processing apparatus of FIG. 1;
【図３】従来の排ガス処理装置の排ガス排出系統図。FIG. 3 is an exhaust gas discharge system diagram of a conventional exhaust gas treatment device.
【図４】図３の排ガス処理装置の排ガス温度等の経時的
変動を示した図。FIG. 4 is a diagram showing a change over time of the exhaust gas temperature and the like of the exhaust gas processing apparatus of FIG. 3;
１ アーク炉 ２ 排ガス通路 ３ 燃焼塔 ４ スプレー塔 ５ バグフィルタ ６ バーナ ７ スプレーノズル ８ 蓄熱材 DESCRIPTION OF SYMBOLS 1 Arc furnace 2 Exhaust gas passage 3 Combustion tower 4 Spray tower 5 Bag filter 6 Burner 7 Spray nozzle 8 Heat storage material
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4D058 JA04 KB05 QA01 QA13 SA20 UA01 UA03 UA25 4K014 CD16 4K056 AA05 BB08 CA02 CA20 DB05 DB07 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D058 JA04 KB05 QA01 QA13 SA20 UA01 UA03 UA25 4K014 CD16 4K056 AA05 BB08 CA02 CA20 DB05 DB07
Claims (1)
ー塔とバグフィルタをその順に設け、該燃焼塔に設けら
れたバーナによって排ガスを加熱して９００℃以上の温
度に２秒間以上保持した後、スプレー塔における散水に
より該排ガスを３００℃以下に急冷する排ガス処理装置
であって、燃焼塔およびその前後の排ガス通路に排ガス
の温度に従い蓄熱と放熱を繰り返す蓄熱材を内張してな
ることを特徴としたアーク炉の排ガス処理装置。A combustion tower, a spray tower, and a bag filter are provided in this order in an exhaust gas passage of an arc furnace, and the exhaust gas is heated by a burner provided in the combustion tower and maintained at a temperature of 900 ° C. or more for 2 seconds or more. An exhaust gas treatment device for rapidly cooling the exhaust gas to 300 ° C. or lower by spraying water in a spray tower, wherein a heat storage material that repeats heat storage and heat release according to the temperature of the exhaust gas is lined in a combustion tower and exhaust gas passages before and after the combustion tower. Characteristic arc furnace exhaust gas treatment equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10189893A JP2000005538A (en) | 1998-06-18 | 1998-06-18 | Waste gas treating device of arc furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10189893A JP2000005538A (en) | 1998-06-18 | 1998-06-18 | Waste gas treating device of arc furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000005538A true JP2000005538A (en) | 2000-01-11 |
Family
ID=16248958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10189893A Pending JP2000005538A (en) | 1998-06-18 | 1998-06-18 | Waste gas treating device of arc furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000005538A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002020128A1 (en) * | 2000-09-06 | 2002-03-14 | Nkk Corporation | Method and device for cooling and collecting dust from exhaust gas containing soot and dust |
| JP2009109107A (en) * | 2007-10-31 | 2009-05-21 | Nippon Spindle Mfg Co Ltd | Cooling apparatus |
| CN104197727A (en) * | 2014-08-13 | 2014-12-10 | 湖州宏鑫铝业有限公司 | System and method for treating tail gas of aluminum smelting furnace |
| CN107541581A (en) * | 2017-07-21 | 2018-01-05 | 北京科技大学 | Steel-making course of the electric arc furnace bioxin is administered and waste heat recovery optimization progress control method |
| CN111944982A (en) * | 2020-09-15 | 2020-11-17 | 大连万通能源装备有限公司 | Novel energy-saving consumption-reducing continuous type cast tube annealing furnace system |
| JP2021105470A (en) * | 2019-12-26 | 2021-07-26 | 中外炉工業株式会社 | Exhaust gas treatment device for electric furnace |
| CN113521892A (en) * | 2021-06-28 | 2021-10-22 | 四川思达能环保科技有限公司 | Flue gas dust removal system |
-
1998
- 1998-06-18 JP JP10189893A patent/JP2000005538A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002020128A1 (en) * | 2000-09-06 | 2002-03-14 | Nkk Corporation | Method and device for cooling and collecting dust from exhaust gas containing soot and dust |
| JP2009109107A (en) * | 2007-10-31 | 2009-05-21 | Nippon Spindle Mfg Co Ltd | Cooling apparatus |
| CN104197727A (en) * | 2014-08-13 | 2014-12-10 | 湖州宏鑫铝业有限公司 | System and method for treating tail gas of aluminum smelting furnace |
| CN107541581A (en) * | 2017-07-21 | 2018-01-05 | 北京科技大学 | Steel-making course of the electric arc furnace bioxin is administered and waste heat recovery optimization progress control method |
| JP2021105470A (en) * | 2019-12-26 | 2021-07-26 | 中外炉工業株式会社 | Exhaust gas treatment device for electric furnace |
| JP7102084B2 (en) | 2019-12-26 | 2022-07-19 | 中外炉工業株式会社 | Electric furnace exhaust gas treatment equipment |
| TWI815003B (en) * | 2019-12-26 | 2023-09-11 | 日商中外爐工業股份有限公司 | Off-gas treatment system of electric arc furnace |
| CN111944982A (en) * | 2020-09-15 | 2020-11-17 | 大连万通能源装备有限公司 | Novel energy-saving consumption-reducing continuous type cast tube annealing furnace system |
| CN111944982B (en) * | 2020-09-15 | 2022-03-29 | 大连万通能源装备有限公司 | Novel energy-saving consumption-reducing continuous type cast tube annealing furnace system |
| CN113521892A (en) * | 2021-06-28 | 2021-10-22 | 四川思达能环保科技有限公司 | Flue gas dust removal system |
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