JPH0129846B2 - - Google Patents
Info
- Publication number
- JPH0129846B2 JPH0129846B2 JP61114305A JP11430586A JPH0129846B2 JP H0129846 B2 JPH0129846 B2 JP H0129846B2 JP 61114305 A JP61114305 A JP 61114305A JP 11430586 A JP11430586 A JP 11430586A JP H0129846 B2 JPH0129846 B2 JP H0129846B2
- Authority
- JP
- Japan
- Prior art keywords
- combustion
- hot air
- powdered fuel
- blast furnace
- rate
- 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
- 239000000446 fuel Substances 0.000 claims description 51
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 30
- 239000001301 oxygen Substances 0.000 claims description 30
- 229910052760 oxygen Inorganic materials 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 13
- 238000007664 blowing Methods 0.000 claims description 8
- 238000002485 combustion reaction Methods 0.000 description 64
- 238000002347 injection Methods 0.000 description 21
- 239000007924 injection Substances 0.000 description 21
- 230000000694 effects Effects 0.000 description 13
- 239000000843 powder Substances 0.000 description 12
- 239000003245 coal Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 6
- 238000011144 upstream manufacturing Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 241000766026 Coregonus nasus Species 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 3
- 239000000295 fuel oil Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment 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
- 238000007689 inspection Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は高炉への粉体燃料吹込方法に関し、詳
細には、一般に燃焼性が悪いとされている粉体燃
料（微粉炭等）を燃料吹込用バーナからブローパ
イプ経由で羽口内へ吹込んで燃焼させるに当た
り、省エネルギーの観点からブローパイプ内への
供給熱風温度を低下させる場合であつても、優れ
た燃焼率を得ることのできる高炉への粉体燃料吹
込方法に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for injecting pulverized fuel into a blast furnace. A blast furnace that can obtain an excellent combustion rate even when the temperature of hot air supplied to the blow pipe is lowered from the viewpoint of energy saving when blowing from the blow burner into the tuyere via the blow pipe for combustion. This invention relates to a powder fuel injection method.
［従来の技術］
高炉操業における燃料は重油吹込みからオール
コークス操業へ移行し、更に微粉炭の吹込みに進
んでいる。しかしながら微粉炭等の粉体燃料（以
下粉体燃料と総称する）は重油に比べて燃焼性が
悪く且つ灰分等の未燃分を含有するという欠点を
有しているので、吹込みに当たつては色々の対策
を講ずる必要がある。[Prior Art] The fuel used in blast furnace operation has shifted from injection of heavy oil to all-coke operation, and has also progressed to injection of pulverized coal. However, pulverized coal and other pulverized fuels (hereinafter collectively referred to as pulverized fuels) have the disadvantages of poor combustibility and contain unburned matter such as ash compared to heavy oil, so it is difficult to inject them. Therefore, it is necessary to take various measures.
こうした状況のもとで本出願人もかねてより粉
体燃料の効果的な吹込み法を確立すべく研究を進
めており、例えば特公昭60−53081号公報に開示
する技術を先に提案した。この方法は粉体燃料の
燃焼率を高めるには熱風炉からブローパイプ内へ
供給される熱風の温度を高めなければならないと
いう前提の下でなされたものであるが、熱風温度
を高めた場合における粉体燃料吹込位置を、重油
燃焼時と同じ様に羽口とブローパイプの境界点近
傍に設定したままであると、羽口及び羽口に続く
レースウエイ内で粉体燃料を完全に燃焼させるこ
とができないという知見に基づいてなされたもの
である。これは粉体燃料の燃焼性が低いことによ
るものであるから、上記公告発明の方法では粉体
燃料の吹込位置をブローパイプ内の上流側へ移行
させ熱風との接触を早めることによつてレースウ
エイ終点に至るまでの熱風との総接触時間を長く
し（即ち粉体燃料の燃焼領域を広げ）、粉体燃料
はレースウエイ出口部へ至るまでに完全に燃焼さ
せてしまおうというものであつた。但し粉体燃料
吹込位置をブローパイプ上流側へ行き過ぎさせる
と、粉体燃料の溶融物（粉体燃料中に含まれる灰
分が高温熱風の為に溶融する）がブローパイプ内
に付着・堆積するので、移行位置については上限
を設けている。上記の様に公告発明では粉体燃料
吹込位置を調整することによつて灰分の付着を防
止しつつ燃料率を高めることに成功したのであ
る。 Under these circumstances, the present applicant has been conducting research for some time in order to establish an effective injection method for powdered fuel, and for example, has previously proposed the technique disclosed in Japanese Patent Publication No. 60-53081. This method was developed on the premise that in order to increase the combustion rate of powdered fuel, it was necessary to increase the temperature of the hot air supplied from the hot blast furnace into the blowpipe. If the powder fuel injection position is set near the boundary point between the tuyere and blowpipe, as in the case of heavy oil combustion, the powder fuel will be completely combusted within the tuyere and the raceway following the tuyere. This was done based on the knowledge that this was not possible. This is due to the low combustibility of powdered fuel, so the method of the announced invention moves the injection position of powdered fuel to the upstream side of the blowpipe to hasten contact with hot air. The idea is to lengthen the total contact time with the hot air until the end of the way (that is, expand the combustion area of the powdered fuel), and ensure that the powdered fuel is completely burned before reaching the exit of the raceway. Ta. However, if the powder fuel injection position is moved too far upstream of the blow pipe, the melted powder fuel (ash contained in the powder fuel melts due to the high temperature hot air) will adhere and accumulate inside the blow pipe. , an upper limit is set for the transition position. As mentioned above, in the disclosed invention, by adjusting the powder fuel injection position, it was possible to prevent the adhesion of ash and increase the fuel ratio.
［発明が解決しようとする問題点］
上記公告発明においては、公告公報第４頁の第
５図に示した通り1050℃以上の高温熱風を用いる
ことが燃焼率向上の前提条件であると認識し、熱
風温度が1050℃未満の場合には所定の効果を挙げ
ることができないと考えていた。一方省エネルギ
ーの要請は益々強くなり、熱風温度はできる限り
低くすることが望まれている。但し燃焼率を犠牲
にする訳にはいかず、粉体燃料の吹込み技術にお
いてき省エネルギーの要請に十分答えることがで
きないという苦渋があつた。[Problems to be solved by the invention] In the above-mentioned published invention, as shown in Figure 5 on page 4 of the published publication, it is recognized that the use of high-temperature hot air of 1050°C or higher is a prerequisite for improving the combustion rate. It was thought that the desired effect could not be achieved if the hot air temperature was less than 1050°C. On the other hand, there is an increasing demand for energy conservation, and it is desired to keep the hot air temperature as low as possible. However, the combustion rate could not be sacrificed, and it was difficult to fully meet the demands for energy conservation in powder fuel injection technology.
本発明はこの様な事情に着目してなされたもの
であつて、その目的は、1050℃を下回る様な低温
の熱風を使用した場合でも、粉体燃料の燃焼率を
十分に高めることのできる高炉への粉体燃料吹込
方法を提供しようといるものである。 The present invention was made with attention to these circumstances, and its purpose is to sufficiently increase the combustion rate of powdered fuel even when using hot air at a low temperature below 1050°C. The aim is to provide a method for injecting powdered fuel into a blast furnace.
［問題点を解決する為の手段］
上記の目的を達成することのできた本発明方法
は、粉体燃料吹込用バーナを、高炉羽口を連設さ
れた熱風吹込用ブローパイプの壁を貫通して該ブ
ローパイプ内へ突入させ、前記バーナから吹込ま
れた粉体燃料をブローパイプ内を流れる1050℃未
満の熱風と共に高炉羽口から吹込む高炉への粉体
燃料吹込方法であつて、熱風中の酸素濃度を23容
量％以上とする点に要旨を有するものである。[Means for Solving the Problems] The method of the present invention, which has achieved the above object, is a method of the present invention in which a burner for blowing powdered fuel is passed through a wall of a blow pipe for blowing hot air connected with a blast furnace tuyere. A method of blowing powdered fuel into a blast furnace in which the powdered fuel is blown into the blowpipe through the blast furnace tuyeres together with the hot air below 1050°C flowing through the blowpipe, and the powdered fuel is blown into the blast furnace through the blast furnace tuyere, The gist of this is that the oxygen concentration is 23% by volume or more.
［作用及び実施例］
以下実験経過に沿つて本発明の構成及び作用効
果を詳細に説明する。第１図は燃焼実験で使用し
た装置の概略図であり、実際の高炉羽口部に模し
た構造に設計されている。粉体燃料Ａは地上ホツ
パー１からスクリユーコンベア２によつてコール
ビン３へ搬送される。コールビン３の下部には粉
体燃料定量供給機４が設けられており、この部分
で一定量ずつ切り出された粉体燃料Ａは、輪送空
気５と共に輪送管６によつてバーナ７へ送られ
る。一方高温熱風炉８で得られた熱風は、送風管
９からブローパイプ１０及び水冷羽口１１を経て
燃焼試験炉１２へ送られる。図中１３は煙突であ
る。[Operations and Examples] The configuration and functions and effects of the present invention will be explained in detail below along with the progress of experiments. Figure 1 is a schematic diagram of the apparatus used in the combustion experiment, which is designed to resemble an actual blast furnace tuyere. Powdered fuel A is conveyed from a ground hopper 1 to a coal bin 3 by a screw conveyor 2. A powdered fuel quantitative feeder 4 is provided at the bottom of the coal bin 3, and the powdered fuel A cut out in fixed amounts at this portion is sent to the burner 7 along with the wheeled air 5 through the wheeled feed pipe 6. It will be done. On the other hand, the hot air obtained in the high-temperature hot air furnace 8 is sent from the blast pipe 9 to the combustion test furnace 12 via the blow pipe 10 and the water-cooled tuyere 11. 13 in the figure is a chimney.
高炉の燃料吹込部は一般の燃焼装置とは全く異
なり、ブローパイプ１０及び水冷羽口１１で構成
されているので、この実験装置は実際の高炉吹込
部に近似させている。またこの試験炉には粉体燃
料の燃焼状態及び着火状態を観察する為ののぞき
窓を多数設けると共に、炉内温度、炉内ガス組
成、炉内ダスト、火炎輻射量等を測定する為の検
査孔が設けられ、且つブローパイプ１０の上流側
曲り部には、該ブローパイプ１０の壁面への灰の
付着状況を観察する為ののぞき窓１４が設けられ
ている。 The fuel injection section of a blast furnace is completely different from a general combustion device and consists of a blow pipe 10 and a water-cooled tuyere 11, so this experimental device approximates an actual blast furnace injection section. In addition, this test furnace is equipped with numerous observation windows to observe the combustion and ignition conditions of the powdered fuel, as well as inspections to measure the temperature inside the furnace, gas composition inside the furnace, dust inside the furnace, amount of flame radiation, etc. A hole is provided, and a peephole 14 is provided at the upstream bent portion of the blowpipe 10 for observing the state of adhesion of ash to the wall surface of the blowpipe 10.
この装置を用いた後記一連の実験における条件
は下記の通りである。 The conditions for the series of experiments described later using this apparatus are as follows.
実験条件
粉体燃料：石炭(揮発分33重量%)
粉体燃料吹込量：100Kg／時間
熱風温度：950〜1200℃
粉体燃料吹込位置：Ｑ点、羽口とブローパイプ
の境界位置から上流200mm
まず前記公告発明に開示した方法を追試し、熱
風温度が1050℃未満であると燃焼率が十分に改善
されない理由を検討したところ、次の様な事実が
明らかとなつた。即ち粉体燃料吹込みバーナ７か
らブローパイプ１０内へ吹込まれた粉体燃料は、
ブローパイプ１０内を流れる熱風から熱を受けて
まず揮発分（水素や一酸化炭素等）が揮発し、こ
れらが着火温度に到達して燃焼が開始される。と
ころが上記の様な従来法において熱風温度が低過
ぎる場合は、粉体燃料自体の昇温と混相状態で吹
込まれてくるキヤリアガスにかなりの熱量が奪わ
れることもあつて、肝心の粉体燃料は十分に加熱
されず、その結果揮発分の揮発開始が遅れるばか
りでなく揮発速度も遅くなり、更には揮発ガスが
着火温度に達するまでの時間も遅れ気味となり、
吹込みから着火燃焼までに相当の時間を要するこ
とになる。その結果粉体燃料の着火は、羽口先端
或はレースウエイ内で起こることとなり、着火後
レースウエイを出るまでの燃焼時間が相対的に著
しく短縮されレースウエイから多量の未燃チヤー
を排出する。従つて熱風温度が1050℃より低い場
合は、前記公告発明に示した如く粉体燃料吹込位
置を100〜350mm程度上流側へ移動させても、レー
スウエイ内での燃焼時間を実質的に延長すること
ができず、結局レースウエイ終了部における粉体
燃料の燃焼状態は殆んど改善されなかつた。殊に
高炉操業時における粉体燃料のレースウエイ通過
所要時間は、ボイラー、キルン、焼結点火炉等に
おける燃料通過所要時間に比べて極端に短く（前
者は後者の1/300〜1/500程度）、こうした条件の
もとでは全滞留時間の半分近くが揮発分の揮発と
着火を含めた言わば予熱に消費されることとな
る。従つて実質的な燃焼時間が不足気味となつ
て、レースウエイ内で完全燃焼するに至らず、多
量の未燃チヤーを排出することになる。尚チヤー
の燃焼は、粒子表面あるいは粒子の空孔内で酸素
と反応することによつて進行する所謂固体の表面
燃焼である為、燃焼は、粒子表面あるいは粒子空
孔内への酸素の拡散律速であると考えられる。Experimental conditions Powdered fuel: Coal (volatile content 33% by weight) Powdered fuel injection amount: 100Kg/hour Hot air temperature: 950 to 1200℃ Powdered fuel injection position: Q point, 200mm upstream from the boundary between the tuyere and blowpipe First, the method disclosed in the above-mentioned published invention was tested and the reason why the combustion rate was not sufficiently improved when the hot air temperature was less than 1050°C was investigated, and the following facts became clear. That is, the powdered fuel blown into the blow pipe 10 from the powdered fuel injection burner 7 is
First, volatile components (hydrogen, carbon monoxide, etc.) are volatilized by receiving heat from the hot air flowing through the blow pipe 10, and when these components reach an ignition temperature, combustion is started. However, in the conventional method as described above, if the hot air temperature is too low, a considerable amount of heat may be taken away by the injected carrier gas in a mixed phase with the temperature of the powdered fuel itself. It is not heated sufficiently, and as a result, not only is the start of volatilization of the volatile matter delayed, but the rate of volatilization is also slow, and furthermore, the time for the volatile gas to reach the ignition temperature is delayed.
It takes a considerable amount of time from injection to ignition and combustion. As a result, ignition of the powdered fuel occurs at the tip of the tuyere or within the raceway, and the combustion time from ignition until exiting the raceway is relatively significantly shortened, and a large amount of unburned char is discharged from the raceway. . Therefore, if the hot air temperature is lower than 1050°C, even if the powder fuel injection position is moved upstream by about 100 to 350 mm as shown in the published invention, the combustion time in the raceway will be substantially extended. As a result, the combustion condition of the powdered fuel at the end of the raceway was hardly improved. In particular, the time required for powdered fuel to pass through the raceway during blast furnace operation is extremely short compared to the time required for fuel to pass through boilers, kilns, sintering ignition furnaces, etc. (the former is approximately 1/300 to 1/500 of the latter). ), under these conditions, nearly half of the total residence time is consumed in so-called preheating, including volatilization of volatile matter and ignition. Therefore, the actual combustion time is insufficient, and complete combustion within the raceway is not achieved, resulting in a large amount of unburned char being discharged. The combustion of char is so-called solid surface combustion that progresses by reacting with oxygen on the particle surface or within the particle pores, so the combustion is rate-limited by the diffusion of oxygen on the particle surface or within the particle pores. It is thought that.
しかるに微粉炭燃焼過程においては、燃焼初期
に急激な揮発化燃焼が起こり、多量の酸素が消費
される。この為揮発化燃焼に続いて起こるチヤー
の固体燃焼段階には粒子環境中の酸素が少なく燃
焼が遅延することになる。 However, in the pulverized coal combustion process, rapid volatile combustion occurs at the beginning of combustion, consuming a large amount of oxygen. For this reason, during the solid combustion stage of the char that follows the volatilization combustion, there is less oxygen in the particle environment and the combustion is delayed.
本発明者等は上記の様な実験結果を基に研究を
重ね、酸素富化された熱風をブローパイプ内へ供
給すれば上述の問題は全て解決できるのではない
かとの指針を得、更に研究を重ねた結果本発明を
完成するに至つた。 The inventors of the present invention conducted repeated research based on the above experimental results, and obtained a guideline that all of the above problems could be solved by supplying oxygen-enriched hot air into the blow pipe. As a result of repeated efforts, the present invention was completed.
即ち前記構成に示す様に、熱風中の酸素濃度を
富化した場合は、酸素富化をしない場合に比べて
着火位置は同じであつても着火後の揮発燃焼はよ
り高温となるので速く進行し、しかもチヤーの燃
焼段階においてはチヤー粒子環境に高温で且つ酸
素濃度の高い熱風が残存する為チヤーの燃焼もよ
り速く進行する。この結果レースウエイ出口部に
おける粉体燃料の燃焼率を向上させることができ
る。 In other words, as shown in the above configuration, when the oxygen concentration in the hot air is enriched, even if the ignition position is the same, the volatile combustion after ignition becomes higher temperature and proceeds faster than when the hot air is not enriched with oxygen. However, since hot air with high temperature and high oxygen concentration remains in the environment of the chir particles during the combustion stage of the chir, the combustion of the chir proceeds more rapidly. As a result, the combustion rate of powdered fuel at the raceway outlet can be improved.
尚本発明においては熱風中の酸素濃度を23容量
％以上とする必要があり、これ未満では上記効果
が得られない場合も発生する。但し必要以上に酸
素濃度を高くしても燃焼率改善効果はそれ以上あ
がらず、酸素富化コストが増大するばかりである
ので酸素濃度は25容量％にとどめることが望まし
い。 In the present invention, the oxygen concentration in the hot air needs to be 23% by volume or more, and if it is less than this, the above effects may not be obtained. However, even if the oxygen concentration is increased more than necessary, the effect of improving the combustion rate will not increase any further and the oxygen enrichment cost will only increase, so it is desirable to keep the oxygen concentration at 25% by volume.
［実施例］
第２図は、熱風温度を950℃とし、熱風中の酸
素濃度を種々変更した場合の燃焼率に及ぼす影響
を示すグラフであり、Ｐ点は羽口先端、Ｑ点はレ
ースウエイ出口部に相当する位置を示す。尚参考
例として前記公告発明において燃焼率が良好であ
つた条件即ち熱風温度が1200℃、O2濃度：21％
のときの燃焼率変化を（Ｆ）で示した。[Example] Figure 2 is a graph showing the effect on the combustion rate when the hot air temperature is 950°C and the oxygen concentration in the hot air is variously changed, where point P is the tip of the tuyere and point Q is the raceway. The position corresponding to the exit section is shown. As a reference example, the conditions under which the combustion rate was good in the published invention, namely, the hot air temperature was 1200°C and the O 2 concentration was 21%.
The change in combustion rate at this time is shown in (F).
第２図において、酸素を富化しない場合(A)
［O2濃度：21容量％］の燃焼率を基準にすると、
酸素富化率１％（O2濃度：22％）の場合(B)には
燃焼率の向上効果は極めて小さく殆んど効果がな
かつた。これに対し酸素富化率２％（O2濃度：
23％）の(C)の場合には顕著な燃焼率向上効果が認
められた。しかしながら酸素富化率をさらに増や
して(D)４％（O2濃度：25％）あるいは(E)８％
（O2濃度：29％）と高めてもそれ以上の燃焼率向
上効果は期待できない。即ち熱風温度が950℃の
場合に満足することのできる燃焼率［レースウエ
イ出口において(F)と同程度の燃焼率］を得ようと
すれば、酸素富化率を２％以上即ち酸素濃度を23
％以上とする必要のあることが分かつた。しかし
ながらレースウエイ出口部における燃焼率改善効
果は(D)酸素富化率４％（O2濃度：25％）で飽和
に達しており、(E)酸素富化率：８％に示す如くさ
らに酸素富化率を上げても燃焼率改善効果はそれ
以上にはあがらないことから、酸素富化率は４％
以下（即ちO2濃度は25％以下）にとどめること
が経済的に望ましいことが分かつた。 In Figure 2, when oxygen is not enriched (A)
Based on the combustion rate of [O 2 concentration: 21% by volume],
In the case of (B) with an oxygen enrichment rate of 1% (O 2 concentration: 22%), the effect of improving the combustion rate was extremely small and had almost no effect. On the other hand, oxygen enrichment rate is 2% (O 2 concentration:
In the case of (C) (23%), a significant combustion rate improvement effect was observed. However, if the oxygen enrichment rate is further increased (D) 4% (O 2 concentration: 25%) or (E) 8%
(O 2 concentration: 29%), no further effect of improving the combustion rate can be expected. In other words, in order to obtain a combustion rate that is satisfactory when the hot air temperature is 950℃ [combustion rate similar to (F) at the raceway exit], the oxygen enrichment rate must be 2% or more, that is, the oxygen concentration must be twenty three
It was found that it was necessary to set the value to % or more. However, the combustion rate improvement effect at the raceway exit reaches saturation at (D) oxygen enrichment rate of 4% (O 2 concentration: 25%), and as shown in (E) oxygen enrichment rate: 8%, further oxygen Even if the enrichment rate is increased, the combustion rate improvement effect will not increase further, so the oxygen enrichment rate is 4%.
It was found that it is economically desirable to keep the O 2 concentration below 25%.
尚第２図に示すグラフから理解される様に、熱
風温度が高い場合(F)のラインに示される通り着火
は、粉体燃料吹込み位置に近い側で起こつてお
り、羽口内および羽口先端（Ｐ点）の燃焼率も高
いレベルで推移している。即ち(F)の場合には熱風
温度が高い為に揮発化燃焼が急速に且つ十分に起
こり、全体としてレースウエイ出口（Ｑ点）にお
ける燃焼率が高くなつている。これに対し熱風温
度が950℃の(A)〜(E)の場合には着火位置は粉体燃
料吹込位置から下流側に移行し、(F)と比べると揮
発化燃焼は遅れ気味に進行する。しかるに(A)〜(E)
のうち酸素を２％以上富化した(C)〜(E)については
揮発化燃焼につづいて起こる未燃チヤーの固体燃
焼が、酸素濃度が高い故に後半に急激に進行し、
レースウエイ出口部（Ｑ点）で(F)と同程度の燃焼
率に到達している。尚酸素を２％以上富化した(C)
〜(E)については(A)、(B)と比べて揮発化燃焼も速く
進行するので、未燃チヤー燃焼段階で供給される
熱風温度が上昇して未燃チヤーの燃焼が一層促進
されたものであると考えられる。 As can be understood from the graph shown in Figure 2, when the hot air temperature is high, ignition occurs near the powder fuel injection position, as shown by line (F), and ignition occurs inside the tuyere and at the tuyere. The combustion rate at the tip (point P) also remains at a high level. That is, in case (F), since the hot air temperature is high, volatile combustion occurs rapidly and sufficiently, and the overall combustion rate at the raceway exit (point Q) is high. On the other hand, in cases (A) to (E) where the hot air temperature is 950℃, the ignition position shifts to the downstream side from the powder fuel injection position, and the volatilization combustion progresses a little later than in (F). . However, (A) ~ (E)
For (C) to (E) enriched with 2% or more of oxygen, the solid combustion of unburned char that occurs following the volatilization combustion rapidly progresses in the latter half due to the high oxygen concentration.
At the exit of the raceway (point Q), the combustion rate has reached the same level as (F). Furthermore, oxygen is enriched by 2% or more (C)
As for ~(E), the volatilization combustion progressed faster than in (A) and (B), so the temperature of the hot air supplied during the unburnt char combustion stage increased and the combustion of the unburned char was further promoted. It is considered to be a thing.
［発明の効果］
本発明は以上の様に構成されており、以下要約
する効果を得ることができる。[Effects of the Invention] The present invention is configured as described above, and can obtain the effects summarized below.
(1) 高炉内へ粉体燃料を吹込むに当たり熱風中の
酸素濃度を高めたことにより、揮発化燃焼につ
づいて起こる未燃チヤーの燃焼を効率良く進行
させることができ、熱風温度を1050℃未満に低
下させてもレースウエイ出口部において十分な
燃焼率を得ることができる。この結果熱風昇温
コストを低減することができ、経済的に高炉操
業を行なうことができる。(1) By increasing the oxygen concentration in the hot air when blowing powdered fuel into the blast furnace, the combustion of unburned coals that occurs following volatilization combustion can proceed efficiently, and the temperature of the hot air can be increased to 1050℃. A sufficient combustion rate can be obtained at the raceway outlet even if the combustion rate is lowered to below. As a result, the cost of heating up the hot air can be reduced, and the blast furnace can be operated economically.
(2) 熱風温度を低下させる場合、従来燃焼率の低
下分だけ粉体燃料の吹込量を低下させる必要が
あつたが、本発明においては熱風温度が高い場
合と同等の燃焼率を得ることができるので吹込
量を低下させる必要がなく、高炉操業を経済的
に実施することが可能である。(2) When lowering the hot air temperature, conventionally it was necessary to reduce the amount of powdered fuel injected by the reduction in combustion rate, but in the present invention, it is possible to obtain the same combustion rate as when the hot air temperature is high. Therefore, there is no need to reduce the amount of injection, and it is possible to operate the blast furnace economically.
第１図は粉体燃焼吹込み実験の概要を示す説明
図、第２図は酸素富化率毎の燃焼率の推移を示す
実験結果グラフである。
１……地上ホツパー、２……スクリユーコンベ
ア、３……コールビン、４……粉体燃料定量供給
機、５……輸送空気、７……粉体燃料吹込みバー
ナ、１０……ブローパイプ、１１……水冷羽口、
１２……燃焼試験炉。
FIG. 1 is an explanatory diagram showing an overview of the powder combustion injection experiment, and FIG. 2 is a graph of the experimental results showing changes in combustion rate for each oxygen enrichment rate. 1...Ground hopper, 2...Screw conveyor, 3...Coal bin, 4...Powdered fuel quantitative feeder, 5...Transporting air, 7...Powdered fuel injection burner, 10...Blow pipe, 11...Water-cooled tuyere,
12... Combustion test furnace.
Claims (1)
れた熱風吹込用ブローパイプの壁を貫通して該ブ
ローパイプ内へ突入させ、前記バーナから吹込ま
れた粉体燃料をブローパイプ内を流れる1050℃未
満の熱風と共に高炉羽口から吹込む高炉への粉体
燃料吹込方法であつて、熱風中の酸素濃度を23容
量％以上とすることを特徴とする高炉への粉体燃
料吹込方法。1. A burner for blowing powdered fuel penetrates the wall of a blowpipe for blowing hot air connected to a blast furnace tuyere and enters the blowpipe, and the powdered fuel injected from the burner is passed through the blowpipe. A method for injecting powdered fuel into a blast furnace by blowing it through a blast furnace tuyere together with flowing hot air at a temperature of less than 1050°C, the method characterized in that the oxygen concentration in the hot air is 23% by volume or more. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11430586A JPS62270709A (en) | 1986-05-19 | 1986-05-19 | Method for blowing powdery fuel into blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11430586A JPS62270709A (en) | 1986-05-19 | 1986-05-19 | Method for blowing powdery fuel into blast furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62270709A JPS62270709A (en) | 1987-11-25 |
| JPH0129846B2 true JPH0129846B2 (en) | 1989-06-14 |
Family
ID=14634544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11430586A Granted JPS62270709A (en) | 1986-05-19 | 1986-05-19 | Method for blowing powdery fuel into blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62270709A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2627232B2 (en) * | 1991-09-09 | 1997-07-02 | 新日本製鐵株式会社 | Blast furnace operation method |
-
1986
- 1986-05-19 JP JP11430586A patent/JPS62270709A/en active Granted
Non-Patent Citations (1)
| Title |
|---|
| THE JOINT SYMPOSIM JISI AND AIMM=1983 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62270709A (en) | 1987-11-25 |
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