JPH03207824A - Operating method for sintering - Google Patents
Operating method for sinteringInfo
- Publication number
- JPH03207824A JPH03207824A JP27690A JP27690A JPH03207824A JP H03207824 A JPH03207824 A JP H03207824A JP 27690 A JP27690 A JP 27690A JP 27690 A JP27690 A JP 27690A JP H03207824 A JPH03207824 A JP H03207824A
- Authority
- JP
- Japan
- Prior art keywords
- waste gas
- ore
- temp
- exhaust
- exhaust 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.)
- Pending
Links
- 238000005245 sintering Methods 0.000 title claims abstract description 25
- 238000011017 operating method Methods 0.000 title description 2
- 238000000034 method Methods 0.000 claims description 10
- 239000002253 acid Substances 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 7
- 238000009833 condensation Methods 0.000 abstract description 5
- 230000005494 condensation Effects 0.000 abstract description 5
- 239000002912 waste gas Substances 0.000 abstract 11
- 239000007789 gas Substances 0.000 description 29
- 239000002994 raw material Substances 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009770 conventional sintering Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、焼結機の操業方法に関し、さらに詳しくは、
ドワイトロイド式焼結機において、吸引排ガスの向け先
を切替えることにより排熱回収量を増大させる方法に係
るものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of operating a sintering machine, and more specifically,
This invention relates to a method of increasing the amount of exhaust heat recovered by switching the direction of suction exhaust gas in a Dwight Lloyd sintering machine.
一般に、高炉用等の原料鉱石を塊状化するには第２図に
示すドワイトロイド式焼結機が使用されている。この焼
結機では、まず原料鉱石２は焼結機１のコンベヤ上に所
定量ずつ切り出され、カットプレート４により厚さの調
整がなされる。次いで、点火炉５により原料鉱石２の上
面がわから着火され燃焼帯７を形威させる。この燃焼帯
７は、コンベヤの移動方向に沿ってコンベヤ下方に設置
された、排風機８、９からの吸引力による機長方向に配
設されたウインドボックスおよび下降管からなる複数の
排風路６、６・・・を通じての下向きの通風により、下
方に吸引され、図示のように漸次下方に移行する。この
燃焼帯の移動に伴って、原料鉱石の焼成反応が進行完了
することになる。Generally, a Dwight Lloyd type sintering machine shown in FIG. 2 is used to agglomerate raw material ore for use in blast furnaces, etc. In this sintering machine, the raw material ore 2 is first cut out in predetermined amounts onto the conveyor of the sintering machine 1, and its thickness is adjusted by the cut plate 4. Next, the upper surface of the raw material ore 2 is ignited by the ignition furnace 5 to form a combustion zone 7. This combustion zone 7 consists of a plurality of air exhaust passages 6 which are provided below the conveyor along the moving direction of the conveyor and are made up of wind boxes and downcomers arranged in the longitudinal direction by suction force from exhaust fans 8 and 9. , 6... are sucked downward and gradually move downward as shown in the figure. As this combustion zone moves, the firing reaction of the raw material ore progresses to completion.
上記焼結操業においては、排熱回収と排ガス量の削減等
の観点から、排気系を機長方向に２分割し、排鉱側排ガ
スを上記焼戒促進用に循環使用している。その一例とし
ては、第３図に示すように、温度Ｔ１、熱量Ｑｌの給鉱
側の排ガスを主排気系から排出し、温度Ｔ２、熱量Ｑ２
の排ガスを排鉱側の排気系に排出する。この排鉱側排気
系では排熱回収ボイラー１２を組み込んで排ガスから排
熱回収を行った後、その排ガスを焼結鉱の加温用として
循環使用させている。In the above-mentioned sintering operation, the exhaust system is divided into two in the machine length direction from the viewpoint of exhaust heat recovery and reduction of the amount of exhaust gas, and the exhaust gas on the ore discharge side is circulated and used for promoting the above-mentioned sintering. As an example, as shown in Fig. 3, the exhaust gas on the ore supply side having a temperature T1 and a calorific value Ql is discharged from the main exhaust system, and a temperature T2 and a calorific value Q2 are discharged from the main exhaust system.
Exhaust gas is discharged to the exhaust system on the ore discharge side. This ore discharge side exhaust system incorporates an exhaust heat recovery boiler 12 to recover exhaust heat from the exhaust gas, and then circulates and uses the exhaust gas for heating the sintered ore.
ところで、かかる焼結操業においては、比較的低温の排
ガスが通過する給鉱側の排気系では、排ガスの温度が比
較的低いことによる酸腐食が問題となる。すなわち、排
ガス温度の低下により、排気系を構成する管路に結露を
生じ、この結露中に排ガス中の酸分が溶解し酸腐食を生
じる。By the way, in such a sintering operation, acid corrosion due to the relatively low temperature of the exhaust gas becomes a problem in the exhaust system on the ore feed side through which relatively low-temperature exhaust gas passes. That is, due to the decrease in exhaust gas temperature, dew condensation occurs in the pipes constituting the exhaust system, and during this dew condensation, acid content in the exhaust gas dissolves, resulting in acid corrosion.
かかる問題を防止するため、給鉱側の排気系の温度を定
期的に検出し、温度が露点以下に低下したような場合、
主排風機の風量を増加させて、主排気系の温度を上昇さ
せて上記結露を防止する方法が従来採られている。To prevent such problems, the temperature of the exhaust system on the ore supply side is periodically detected, and if the temperature drops below the dew point,
Conventionally, a method has been adopted to prevent the above-mentioned dew condensation by increasing the air volume of the main exhaust fan and raising the temperature of the main exhaust system.
しかし、主排風機の風量を過度に増加させるのは無駄で
あるばかりか、循環排風機への風量が低下すると、いわ
ゆる焼結完了点（ＢＴＰ）の位置が変化し、焼結が充分
に行われない結果、焼結鉱の品質低下を招来する。そこ
で本発明者は先に（特願昭６３−１４４８１６号）、主
排風機の排風量に呼応させて循環排風機の排風量を調節
して焼結条件を適当に維持する方法を提案した（以下「
先行法」という。）。However, not only is it wasteful to excessively increase the air volume of the main exhaust fan, but if the air volume to the circulation exhaust fan decreases, the position of the so-called sintering completion point (BTP) changes, and sintering does not take place sufficiently. As a result, the quality of sintered ore deteriorates. Therefore, the present inventor has previously proposed (Japanese Patent Application No. 144816/1982) a method for maintaining appropriate sintering conditions by adjusting the amount of air discharged by a circulating fan in response to the amount of air discharged by the main fan. below"
"precedent law". ).
しかしながら、先行法では、主排気系の温度として酸腐
食を生じない温度以上に設定しなから主排風機の排風量
に呼応させて循環排風機の排風量を調節することは、Ｂ
ＰＴ点の変動防止には効果があるものの、分割点（焼結
機からの排風が循環排気系と主排気系とに分割される点
）が固定されているため、原料条件、焼成条件、大気温
度の変動があったとき、排風量のみの調節では、排ガス
温度のコントロールには限界があった。However, in the prior method, the temperature of the main exhaust system is not set above a temperature that does not cause acid corrosion, and the exhaust air volume of the circulation exhaust fan is adjusted in response to the air volume of the main exhaust fan.
Although it is effective in preventing fluctuations in the PT point, since the dividing point (the point where the exhaust air from the sintering machine is divided into the circulation exhaust system and the main exhaust system) is fixed, the raw material conditions, firing conditions, When there are fluctuations in atmospheric temperature, there are limits to controlling the exhaust gas temperature by adjusting only the exhaust air volume.
すなわち、操業条件によっては低温側（給鉱側）排ガス
の温度が過度に上昇させられることがあり、その分排鉱
側への顕熱量が低下し、もって排熱回収効率が低下する
事態を招く。In other words, depending on the operating conditions, the temperature of the exhaust gas on the low temperature side (ore supply side) may rise excessively, which reduces the amount of sensible heat transferred to the ore discharge side, leading to a situation where the exhaust heat recovery efficiency decreases. .
そこで本発明の主たる課題は、効率的な排熱回収を行う
ことにある。Therefore, the main object of the present invention is to efficiently recover waste heat.
上記課題は、排鉱側の高温排ガス吸引系と給鉱側の低温
排ガス吸引系とに分割するとともに、その高温排ガスの
排熱回収した後再循環使用する焼結機の操業方法におい
て：
吸引排気系の上記分割位置近傍の吸引路に排気向け先切
替え手段を設け、操業状況に応じて、前記切替え手段を
操作して前記吸引路からの吸引排ガスの向け先を排鉱側
あるいは給鉱側へ切替えることで解決できる。The above issues are addressed in the operating method of a sintering machine, which is divided into a high-temperature exhaust gas suction system on the ore discharge side and a low-temperature exhaust gas suction system on the ore supply side, and the exhaust heat of the high-temperature exhaust gas is recovered and then recirculated. An exhaust gas destination switching means is provided in the suction passage near the dividing position of the system, and the switching means is operated to direct the suction exhaust gas from the suction passage to the ore discharge side or the ore supply side, depending on the operating situation. This can be resolved by switching.
本発明では、吸引排気系の分割位置近傍の吸弓路に排気
向け先切替え手段を設け、操業状況に応じて、前記切替
え手段を操作して前記吸引路からの吸引排ガスの向け先
を排鉱側あるいは給鉱側へ切替えるようにしているので
、主排気系の排ガス温度を酸腐食を生じる限界温度近傍
に保持しながら、循環排気を行うことができるので、循
環排気系の熱量が増大し、もって排熱回収効率が高まる
。In the present invention, an exhaust destination switching means is provided in the suction path near the dividing position of the suction and exhaust system, and the switching means is operated to change the destination of the suction exhaust gas from the suction path according to the operating situation. Since the exhaust gas temperature in the main exhaust system can be maintained close to the limit temperature that causes acid corrosion, circulating exhaust can be performed, which increases the amount of heat in the circulating exhaust system. This increases waste heat recovery efficiency.
以下本発明を図面を参照しながらさらに詳説する。 The present invention will be explained in more detail below with reference to the drawings.
まず第１図により、本発明にかかる焼結操業方法を説明
する。なお、前記第３図に示す従来例と同一構或部分は
説明を省略する。First, the sintering operation method according to the present invention will be explained with reference to FIG. Note that explanations of the same structures and parts as those of the conventional example shown in FIG. 3 will be omitted.
第Ｆ図に示す本発明の具体例では、分割点近傍のウイン
ドボックス下降管６“の下部を分岐管６０、６０′に分
岐し、分岐管６０を給鉱側の排気系に、分岐管６０゛を
排鉱側の排気系にそれぞれ連通させるとともに、その分
岐点に本発明に係る切替手段としての切替ダンバーＩＩ
を設け、操業条件に応じて高温側（排鉱例）、低温側（
給鉱例）への排風の切替えを行う。排鉱例へ吸収した排
ガスは排熱回収ボイラーｌ２により排熱回収した後、循
環排風機８によりフードエ０内に投入し、再循環使用す
るようにする。In the specific example of the present invention shown in FIG. are connected to the exhaust system on the ore discharge side, and a switching damper II as a switching means according to the present invention is installed at the branch point.
A high temperature side (example) and a low temperature side (example) are installed depending on the operating conditions.
Switch the exhaust air to (example). After the exhaust gas absorbed into the discharged ore is recovered by the exhaust heat recovery boiler 12, it is introduced into the hood 0 by the circulation exhaust fan 8, so that it can be recirculated and used.
このような設備構成の下で、いま、低温側の排気系の温
度が結露点以下になりそうな時は、上記ダンバー１１を
操作して、下降管６゜を通る排ガスの全量または一部を
主排気系（給鉱例排気系）通風するようにし、また低温
側が必要以上に高温になった時は、上記ダンパー１ｌを
操作して、循環排気系（排鉱例排気系）に通風するよう
にする。Under this equipment configuration, if the temperature of the exhaust system on the low-temperature side is about to drop below the condensation point, operate the damper 11 to remove all or part of the exhaust gas passing through the downcomer pipe 6°. Make sure that the main exhaust system (exhaust system for ore supply) is ventilated, and when the low temperature side becomes higher than necessary, operate the damper 1l mentioned above to ventilate the circulation exhaust system (exhaust system for ore discharge example). Make it.
また、かかる排気ガスの向け先の切替えとともに、先行
法を併用して、主排気系の排風量の変動とこれに呼応し
た循環排風系の風量調整を行うことができる。In addition to switching the destination of the exhaust gas, it is also possible to use the preceding method in combination to change the exhaust air volume of the main exhaust system and adjust the air volume of the circulation exhaust system in response to this change.
また、第１図の下方にグラフで示したように、排ガス温
度は、上記ベース状態からＢ状態に変化しても、焼結の
完了する点（ＢＴＰ）はベース状態から変化させない制
御が可能で、これにより焼結鉱の品質は良好に維持でき
る。Furthermore, as shown in the graph at the bottom of Figure 1, even if the exhaust gas temperature changes from the base state to state B, it is possible to control the sintering completion point (BTP) so that it does not change from the base state. This allows the quality of the sintered ore to be maintained at a good level.
上記分割点の決定方法は、主排気系の酸腐食防止のため
、低温側排ガスの温度が酸露点以下にならないように定
められる。具体的には、ウインドボックス下降管の温度
が２５０〜３００℃の個所とすることができる。また主
排風機９の人口温度が８５゜Ｃ以上となるように、切替
え操作を行うようにするのが望ましい。The method for determining the division points is determined so that the temperature of the low-temperature side exhaust gas does not fall below the acid dew point in order to prevent acid corrosion of the main exhaust system. Specifically, the wind box downcomer may have a temperature of 250 to 300°C. Further, it is desirable to perform the switching operation so that the population temperature of the main exhaust fan 9 is 85°C or higher.
上記例では、ダンパーを一つのウインドボックス下降管
に設置したが、複数の下降管にダンパーを設けて、分割
点を操業条件に応じて変更することも本発明発明の要旨
内である。In the above example, the damper is installed in one wind box downcomer pipe, but it is also within the scope of the present invention to provide dampers in a plurality of downcomer pipes and change the dividing point depending on the operating conditions.
次に実施例を説明する。 Next, an example will be described.
第１図に示すように、機長６０ｍの焼結機を５＝１に二
分割し、排鉱側高温ガスを排熱回収ボイラーにて排熱回
収後再循環する焼結設備の下で、本発明を実施した。As shown in Figure 1, a sintering machine with a machine length of 60 m is divided into two parts (5 = 1), and the high temperature gas on the exhaust side is recovered in an exhaust heat recovery boiler and then recirculated under the sintering equipment. carried out the invention.
ベース（定常状態）において、主排気系の腐食防止のた
め、主排風機の入口温度Ｔ１が９０℃となるように、主
排風機の排風量を制御した。In the base (steady state), in order to prevent corrosion of the main exhaust system, the exhaust air volume of the main exhaust fan was controlled so that the inlet temperature T1 of the main exhaust fan was 90°C.
これに対して、排ガスの向け先を切り替えない従来例を
そのまま採用した場合には、操業条件がＢに変化したと
きは、第１表に示すように、主排風系のＴｌおよびＱ１
が上昇する反面、循環排風系のＱ２が低下する結果、排
熱回収量が大幅に低下した。On the other hand, if the conventional example in which the exhaust gas destination is not switched is adopted as is, when the operating condition changes to B, as shown in Table 1, Tl and Q1 of the main exhaust system
On the other hand, Q2 of the circulation exhaust system decreased, and as a result, the amount of exhaust heat recovered decreased significantly.
一方、本発明に従って、操業条件Ｂに変化したとき、排
ガスの向け先を排鉱側に切り替えると、主排風系のＴＩ
およびＱｌがほぼ一定であるとともに、循環排風系のＱ
２が増大し、排熱回収量が約１．５２倍（２９７０ ／
１９５０ ）に高まった。On the other hand, according to the present invention, when the operating condition changes to B, if the exhaust gas direction is switched to the ore discharge side, the main exhaust system TI
and Ql are almost constant, and the Q of the circulating exhaust system
2 increases, and the amount of waste heat recovered is approximately 1.52 times (2970 /
1950).
第
ｌ
表
〔発明の効果〕
以上の通り、本発明によれば、低温側の排ガスの温度管
理が容易であるとともに、効率的な排熱回収が可能とな
る。Table 1 [Effects of the Invention] As described above, according to the present invention, it is easy to manage the temperature of the exhaust gas on the low temperature side, and it is possible to efficiently recover exhaust heat.
第Ｆ図は本発明例の模式図、第２図はドヮイトロイド式
焼結機における燃焼状況説明図、第３図は従来の焼結機
の模式図である。
１・・・焼結機、３・・・焼結原料、５・・・点火炉、
６・・・ウインドボックス（排風機）、７・・・燃焼帯
、８・・・循環排風機、９・・一主排風機、ＩＯ、１０
’・・・フード、１１・・・ダンパーFIG. F is a schematic diagram of an example of the present invention, FIG. 2 is an explanatory diagram of a combustion situation in a German sintering machine, and FIG. 3 is a schematic diagram of a conventional sintering machine. 1... Sintering machine, 3... Sintering raw material, 5... Ignition furnace,
6... Wind box (exhaust fan), 7... Combustion zone, 8... Circulation exhaust fan, 9... Main exhaust fan, IO, 10
'...Hood, 11...Damper
Claims (1)
吸引系とに分割するとともに、その高温排ガスの排熱回
収した後再循環使用する焼結機の操業方法において； 吸引排気系の上記分割位置近傍の吸引路に排気向け先切
替え手段を設け、操業状況に応じて、前記切替え手段を
操作して前記吸引路からの吸引排ガスの向け先を排鉱側
あるいは給鉱側へ切替えることを特徴とする焼結操業方
法。(1) In a method of operating a sintering machine that is divided into a high-temperature exhaust gas suction system on the ore discharge side and a low-temperature exhaust gas suction system on the ore supply side, and the exhaust heat of the high-temperature exhaust gas is recovered and then recirculated; An exhaust gas destination switching means is provided in the suction passage near the dividing position, and the switching means is operated to switch the destination of the suction exhaust gas from the suction passage to the ore discharge side or the ore supply side, depending on the operating situation. A sintering operation method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27690A JPH03207824A (en) | 1990-01-05 | 1990-01-05 | Operating method for sintering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27690A JPH03207824A (en) | 1990-01-05 | 1990-01-05 | Operating method for sintering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03207824A true JPH03207824A (en) | 1991-09-11 |
Family
ID=11469382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27690A Pending JPH03207824A (en) | 1990-01-05 | 1990-01-05 | Operating method for sintering |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03207824A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009523912A (en) * | 2006-01-19 | 2009-06-25 | シーメンス・ファオアーイー・メタルズ・テクノロジーズ・ゲーエムベーハー・ウント・コ | Process for sintering in sintering equipment |
| JP2011105985A (en) * | 2009-11-16 | 2011-06-02 | Kobe Steel Ltd | Method for treating exhaust gas in sintering machine |
| JP2012251698A (en) * | 2011-06-01 | 2012-12-20 | Jp Steel Plantech Co | Waste heat recovery equipment of sintered ore cooling device, waste heat recovering method, and sintering machine system |
| CN113183048A (en) * | 2021-04-20 | 2021-07-30 | 淄博日新陶瓷磨削制品有限公司 | Resin grinding wheel sintering and waste gas treatment device |
-
1990
- 1990-01-05 JP JP27690A patent/JPH03207824A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009523912A (en) * | 2006-01-19 | 2009-06-25 | シーメンス・ファオアーイー・メタルズ・テクノロジーズ・ゲーエムベーハー・ウント・コ | Process for sintering in sintering equipment |
| JP2011105985A (en) * | 2009-11-16 | 2011-06-02 | Kobe Steel Ltd | Method for treating exhaust gas in sintering machine |
| JP2012251698A (en) * | 2011-06-01 | 2012-12-20 | Jp Steel Plantech Co | Waste heat recovery equipment of sintered ore cooling device, waste heat recovering method, and sintering machine system |
| CN113183048A (en) * | 2021-04-20 | 2021-07-30 | 淄博日新陶瓷磨削制品有限公司 | Resin grinding wheel sintering and waste gas treatment device |
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