JPH0129847B2 - - Google Patents
Info
- Publication number
- JPH0129847B2 JPH0129847B2 JP7336187A JP7336187A JPH0129847B2 JP H0129847 B2 JPH0129847 B2 JP H0129847B2 JP 7336187 A JP7336187 A JP 7336187A JP 7336187 A JP7336187 A JP 7336187A JP H0129847 B2 JPH0129847 B2 JP H0129847B2
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- gas
- combustion
- powdered fuel
- powdered
- 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 128
- 238000002347 injection Methods 0.000 claims description 24
- 239000007924 injection Substances 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 20
- 238000007664 blowing Methods 0.000 claims description 3
- 238000010344 co-firing Methods 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 description 49
- 239000007789 gas Substances 0.000 description 45
- 230000000694 effects Effects 0.000 description 13
- 239000000843 powder Substances 0.000 description 12
- 239000000571 coke Substances 0.000 description 11
- 239000003245 coal Substances 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 6
- 239000012159 carrier gas Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Landscapes
- 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）を高炉内へ吹込む方法において、
粉体燃料の燃焼率を高めることのできる方法に関
するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for injecting powdered fuel into a blast furnace. In the method of inhaling,
The present invention relates to a method capable of increasing the combustion rate of powdered fuel.
［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
する技術を提案した。この方法は、粉体燃料の燃
焼率向上とブローパイプ内への灰分付着防止とい
う２つの要望をどちらも満足させる手段として粉
体燃料の吹込み位置をブローパイプの上流側へ移
行させたものであり、この方法であればブローパ
イプ内に供給される熱風温度を高めてもブローパ
イプ壁面への灰分の付着が防止される為、前記２
つの要望を同時に満足することができるに至つ
た。 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 has proposed, for example, the technique disclosed in Japanese Patent Publication No. 53081/1981. This method moves the injection position of powdered fuel to the upstream side of the blowpipe in order to satisfy the two demands of improving the combustion rate of powdered fuel and preventing ash from adhering to the inside of the blowpipe. Yes, this method prevents ash from adhering to the blowpipe wall even if the temperature of the hot air supplied into the blowpipe is increased.
We have now been able to satisfy two demands at the same time.
［発明が解決しようとする問題点］
即ち前記提案発明では、公告公報第４頁の第５
図にも示している通り1050℃以上という高温の熱
風を用いることが燃焼率向上の為の必要条件と考
えており、1050℃未満の熱風を用いた場合の燃焼
率は非常に低い。その為熱風炉の操業温度を高め
なければならず、省エネルギーの観点から不利に
なることに加えて炉壁耐火物やダクトの寿命が短
縮されることとなり、設備のメンテナンス性が悪
化する。[Problems to be solved by the invention] In other words, in the proposed invention,
As shown in the figure, we believe that using hot air at a high temperature of 1050℃ or higher is a necessary condition for improving the combustion rate, and the combustion rate when using hot air below 1050℃ is extremely low. Therefore, the operating temperature of the hot air stove must be increased, which is disadvantageous from the viewpoint of energy conservation, and also shortens the life of the furnace wall refractories and ducts, which deteriorates the maintainability of the equipment.
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するものである。 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. This paper attempts 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
の構成は、粉体燃料を高炉内へ吹込むに当たり、
ブローパイプから供給される熱風温度を810℃以
上に調整すると共に、粉体燃料吹込管と平行して
ガス燃料吹込管を配設し、粉体燃料とガス燃料の
混焼を行なわせつつ高炉内へ吹込むところに要旨
を有するものである。[Means for solving the problems] The structure of the method of the present invention that can achieve the above object is that when injecting powdered fuel into the blast furnace,
The temperature of the hot air supplied from the blow pipe is adjusted to 810°C or higher, and a gas fuel injection pipe is installed in parallel with the powder fuel injection pipe, allowing the powder fuel and gas fuel to co-fire while flowing into the blast furnace. The gist is what you say.
［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、実際の高炉羽口部を模し
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、輸送空
気５と共に輸送管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 operation 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 pulverized fuel quantitative feeder 4 is provided at the bottom of the coal bin 3, and the pulverized fuel A cut out in fixed amounts at this portion is sent to the burner 7 through a transport pipe 6 together with transport air 5. 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 tuyeres 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35重量％
粉体燃料吹込量：100Kg／時間
熱風温度：700〜1200℃
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、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
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り、実質
的な燃焼時間が不足気味となつて燃焼率の向上を
果たし得なかつたものと考えられる。Experimental conditions Powdered fuel: Coal, volatile content 35% by weight Powdered fuel injection amount: 100Kg/hour Hot air temperature: 700 to 1200℃ Powdered fuel injection position: Q point, 200mm upstream from the boundary between the tuyere and blowpipe First When the method disclosed in the above-mentioned published invention was further tested and the reason why the combustion rate was not sufficiently improved when the hot air temperature was less than 1050°C was investigated, 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 will be taken away by the carrier gas that is blown in a mixed phase with the temperature of the powdered fuel itself, and the essential powdered fuel will not be sufficiently heated. As a result, not only is the start of volatilization of the volatile matter delayed, but also the rate of volatilization is slowed, and furthermore, the time for the volatile gas to reach the ignition temperature is delayed, and it takes a considerable amount of time from injection to ignition combustion. become. 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. Therefore, if the hot air temperature is lower than 1050℃, the powder fuel injection position should be changed to 100℃ as shown in the above-mentioned published invention.
Even if it was moved upstream by about 350 mm, the combustion time within the raceway could not be substantially extended, and the combustion state 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, and the actual combustion time becomes insufficient to improve the combustion rate. It is considered that it was not obtained.
そこで本発明者は、比較的低温の熱風を用いた
場合でも粉体燃料の燃焼率を満足の行く程度まで
高める為には、ブローパイプ内へ吹込まれた粉体
燃料が着火するまでの所要時間をできるだけ短縮
するのが有効であろうと考え、かかる着想に沿つ
て更に研究を進めた。その結果、ブローパイプ内
へ粉体燃料と共にガス燃料を吹込み、該ガス燃料
の燃焼熱によつて粉体燃料からの揮発分の急速揮
発化及び該揮発分の着火を促進させるのが有効で
あろうとの着想を持つに至つた。即ち粉体燃料と
ガス燃料の混焼という手段の採用を意図するに至
つたのである。そこでこうした着想を実現すべく
更に研究を進めた結果、ガス燃料としてコークス
炉ガス、天然ガス、都市ガス、転炉ガス、石油ガ
ス、高炉ガスなどを選択し、且つ該ガス燃料の吹
込管を粉体燃料の吹込管に併設して両燃料を同時
に吹込む方法を採用すれば、上記の着想が実用に
即した技術として実現され得るという結論を得る
に至つた。とりわけ、これらのガス燃料のうちコ
ークス炉ガスは燃焼速度が高いので本発明の効果
が大きいし、製鉄所で副生するので最適である。 Therefore, the present inventor has determined that in order to increase the combustion rate of powdered fuel to a satisfactory level even when using relatively low-temperature hot air, the time required for the powdered fuel blown into the blow pipe to ignite is We thought that it would be effective to shorten the time period as much as possible, and conducted further research based on this idea. As a result, it is effective to blow gas fuel together with powdered fuel into the blowpipe and use the combustion heat of the gaseous fuel to rapidly volatilize the volatile matter from the powdered fuel and promote the ignition of the volatile matter. I came up with the idea that it would be possible. In other words, the idea was to adopt a method of co-firing powdered fuel and gas fuel. Therefore, as a result of further research to realize this idea, we selected coke oven gas, natural gas, city gas, converter gas, petroleum gas, blast furnace gas, etc. as gas fuels, and we also changed the injection pipe of the gas fuel to powder. We have come to the conclusion that the above idea can be realized as a practical technology by adopting a method in which both fuels are injected simultaneously by installing the fuel injector pipe alongside the fuel injection pipe. In particular, among these gas fuels, coke oven gas has a high combustion rate, so the effects of the present invention are large, and it is optimal because it is produced as a by-product in ironworks.
すなわち、コークス炉ガスの主成分は水素（全
体の50〜60％）であつて、その燃焼速度はLPG
や天然ガスの７〜８倍であり、これをブローパイ
プ内へ吹込むと比較的低温の熱風であつてもすみ
やかに着火燃焼する。そしてその燃焼熱によつて
粉体燃料中の揮発分の急速揮発化及びその着火が
促進される結果、粉体燃料の着火までの所要時間
が著しく短縮され、それに伴つて粉体燃料の燃焼
時間が延長されることとなり、燃焼率を著しく高
めることができる。この場合、ガス燃料を粉体燃
料送給用のキヤリヤガスとして同時に供給するこ
とも考えられるが、本発明者が実験により確認し
たところでは、該ガス燃料は粉体燃料とは独立し
て供給すべきであることが分かつた。その理由は
下記の通りである。即ちガス燃料を粉体燃料と混
合した状態でブローパイプ内へ供給した場合、熱
風によるガス燃料の昇温・着火が粉体燃料の混入
によつて抑制され、期待されるほどの燃焼促進効
果を得ることができない。この点をより詳細に説
明すると、高炉への粉体燃料吹込みに当たつて
は、温度の低いキヤリヤガス量はできるだけ少な
い方がよいとされており、粉体燃料／キヤリヤガ
スの重量比率は一般に10〜30（Kg／Kg）の範囲か
ら選択される。この様に粉体燃料濃度の高い吹込
条件のもとでは、吹込まれる固気混相流における
輻射伝熱率及び光学的透過性は非常に低いものと
ならざるを得ない。しかもガス燃料を粉体燃料中
に混入して供給する方法を採用すると、ガス燃料
は大量の粉体燃料によつて稀釈されることとな
る。そして当該混相流の着火燃焼は、その最外周
側で熱風による熱を受けて進行することになる
が、ガス燃料が着火温度まで昇温する為には同時
に粉体燃料（ガスに比べて熱容量が大きい）まで
も昇温させなければならない為、粉体燃料による
稀釈に伴う着火遅延とも相まつてガス燃料の着火
燃焼自体が遅延し、燃焼促進効果を満足に高める
ことができない。また粉体燃料とガス燃料の流量
を個別に制御する面からも両燃料を独立して吹込
んだほうが好ましいことはいうまでもないし、安
全性を確保される。 In other words, the main component of coke oven gas is hydrogen (50-60% of the total), and its combustion rate is that of LPG.
It is seven to eight times more powerful than natural gas, and when it is blown into a blowpipe, it quickly ignites and burns even with relatively low-temperature hot air. The heat of combustion promotes the rapid volatilization of the volatile matter in the powdered fuel and its ignition, resulting in a marked reduction in the time required to ignite the powdered fuel, and as a result, the combustion time of the powdered fuel As a result, the combustion rate can be significantly increased. In this case, it is possible to simultaneously supply gas fuel as a carrier gas for powder fuel delivery, but the inventor has confirmed through experiments that gas fuel should be supplied independently from powder fuel. It turns out that it is. The reason is as follows. In other words, when gas fuel is mixed with powdered fuel and supplied into the blow pipe, the temperature rise and ignition of the gaseous fuel caused by hot air is suppressed by the mixture of powdered fuel, and the expected combustion promotion effect is achieved. can't get it. To explain this point in more detail, when injecting powdered fuel into a blast furnace, it is said that the amount of low-temperature carrier gas should be as small as possible, and the weight ratio of powdered fuel/carrier gas is generally 10. Selected from the range of ~30 (Kg/Kg). Under such injection conditions with a high concentration of powdered fuel, the radiant heat transfer rate and optical transparency of the solid-gas multiphase flow that is injected must be extremely low. Moreover, if a method of supplying gas fuel mixed with powdered fuel is adopted, the gaseous fuel will be diluted with a large amount of powdered fuel. The ignition combustion of the multiphase flow proceeds by receiving heat from the hot air on the outermost side, but at the same time, in order for the gas fuel to rise to the ignition temperature, the powder fuel (which has a lower heat capacity than the gas) Since it is necessary to raise the temperature even to a large temperature, the ignition combustion itself of the gas fuel is delayed together with the ignition delay due to dilution with the powdered fuel, making it impossible to satisfactorily enhance the combustion promotion effect. It goes without saying that it is preferable to inject the powdered fuel and the gaseous fuel independently from the viewpoint of controlling the flow rates of the powdered fuel and the gaseous fuel separately, and safety is ensured.
これに対しガス燃料を粉体燃料が独立して平行
供給すると、ガス燃料は熱風に接して瞬時に着火
温度まで昇温して着火・燃焼し、その燃焼熱が粉
体燃料中の揮発分の揮発・着火に生かされる結
果、粉体燃料の燃焼開始までの時間が著しく短縮
される。従つてガス燃料を粉体燃料とは独立して
供給する限り本発明の効果は有効に発揮される
が、最も好ましいのは、例えば第２図（縦断面
図）に示す如く粉体燃料吹込用ノズル７を多重管
構造（図例では二重管）とし、内管７ａから粉体
燃料Ａを供給すると共に外管７ｂからガス燃料Ｃ
を供給する方法である。しかしてこの様な吹込み
方式を採用すると、粉体燃料Ａをとりまく様にし
てガス燃料Ｃが吹込まれることになり、最外周側
のガス燃料は熱風により直ちに着火・燃焼すると
共に、粉体燃料を外周側から一斉に加熱すること
となり、粉体燃料の着火・燃焼開始時間を著しく
短縮することができる。 On the other hand, when gas fuel and powdered fuel are supplied independently and in parallel, the gaseous fuel comes into contact with hot air and instantaneously rises in temperature to the ignition temperature, ignites and burns, and the combustion heat is absorbed by the volatile matter in the powdered fuel. As a result of being utilized for volatilization and ignition, the time it takes for powdered fuel to start burning is significantly shortened. Therefore, the effects of the present invention can be effectively exhibited as long as the gas fuel is supplied independently of the powdered fuel, but it is most preferable to supply the powdered fuel as shown in FIG. 2 (longitudinal cross-sectional view). The nozzle 7 has a multi-tube structure (double pipe in the illustrated example), and powdered fuel A is supplied from the inner pipe 7a, and gaseous fuel C is supplied from the outer pipe 7b.
This is a method of supplying However, if such a lever injection method is adopted, the gas fuel C will be injected so as to surround the powder fuel A, and the gas fuel on the outermost side will be immediately ignited and burned by the hot air, and the powder will be ignited and burned. Since the fuel is heated all at once from the outer circumferential side, the ignition and combustion start time of the powdered fuel can be significantly shortened.
ところでガス燃料の吹込みによつて得られる上
記の燃焼促進効果を発揮させる為には、ガス燃料
を着火させる最少限の温度が必要であり、以下の
実験例（第３図参照）でも明らかにする通り熱風
温度を少なくとも810℃以上としなければならな
い。しかして熱風温度が810℃未満である場合は
ガス燃料の着火自体に相当の時間がかかり、従来
例（ガス燃料吹込みなし）を超える燃焼促進効果
を得ることはできない。ちなみに第３図は、前記
第１図に示した燃焼実験装置を使用し、
(A) 粉体燃料単独吹込み、
(B) 粉体燃料輸送空気５内へ10Nm3／Ｈのコーク
ス炉ガスを混入させて粉体燃料と共に供給、或
は
(C) 第２図に示す二重管構造の粉体燃料吹込みバ
ーナ７を使用し、内管７ａから粉体燃料を、ま
た外管７ｂからはコークス炉ガス（10Nm3／
Ｈ）を夫々独立して送給した場合
について、夫々の熱風温度と燃焼率の関係を示し
たものである。 By the way, in order to exhibit the above-mentioned combustion promotion effect obtained by injecting gas fuel, a minimum temperature is required to ignite the gas fuel, and the following experimental example (see Figure 3) clearly shows that The hot air temperature must be at least 810℃ or higher. However, when the hot air temperature is less than 810° C., it takes a considerable amount of time to ignite the gas fuel, and it is not possible to obtain a combustion promotion effect exceeding that of the conventional example (without gas fuel injection). By the way, Fig. 3 shows the combustion experiment equipment shown in Fig. 1 above (A) injecting powdered fuel alone, (B) coke oven gas of 10Nm 3 /H into the powdered fuel transport air 5. (C) Use the powder fuel injection burner 7 with a double pipe structure shown in Fig. 2 to supply powder fuel from the inner pipe 7a and from the outer pipe 7b. Coke oven gas (10Nm 3 /
The relationship between the hot air temperature and the combustion rate is shown in the case where H) is fed independently.
第３図の結果から次の様に考えることができ
る。 From the results shown in Figure 3, the following can be considered.
(1) 前記公告発明の方法(A)では、熱風温度を1050
℃以上に高めることによつてはじめて急激な燃
焼率の向上が認められ、1050℃未満の熱風温度
を採用する限り十分な燃焼率向上効果を期待す
ることはできない。(1) In the method (A) of the announced invention, the hot air temperature is set to 1050
A rapid improvement in the combustion rate is observed only when the temperature is increased above 1050°C, and as long as a hot air temperature of less than 1050°C is used, a sufficient effect of improving the combustion rate cannot be expected.
(2) コークス炉ガスを粉体燃料と共に供給した場
合であつても、両者を混合状態で供給した例(B)
では、上記(A)法に比べて極くわずかの燃焼率向
上効果が認められるだけであつて、飛躍的効果
は得られない。(2) Even when coke oven gas is supplied together with powdered fuel, an example where both are supplied in a mixed state (B)
In this case, compared to the above method (A), only a slight effect of improving the combustion rate is observed, and no dramatic effect is obtained.
(3) これらに対し、二重管構造のノズルを使用
し、内管から粉体燃料、外管からコークス炉ガ
スを夫々独立して送給する本発明法(C)を採用す
ると、810℃前後を境としてそれより高温側で
は燃焼率が急激に上昇し、殊に810〜1050℃の
熱風温度領域においては、燃焼率を従来例の２
〜３倍に激増することができる。(3) On the other hand, if we adopt the present invention method (C), which uses a nozzle with a double tube structure and feeds powdered fuel from the inner tube and coke oven gas from the outer tube, the temperature rises to 810℃. The combustion rate rises rapidly on the higher temperature side, especially in the hot air temperature range of 810 to 1050℃, where the combustion rate is lower than that of the conventional example.
It can be increased up to 3 times.
本発明は上記の様に構成されるが、その最大の
特徴は、粉体燃料とガス燃料を独立して供給し、
高温の熱風により該ガス燃料を即座に燃焼させて
その燃焼熱により粉体燃料を急速に加熱するとこ
ろにあり、これにより粉体燃料中の揮発分の揮発
及び着火を加速し、燃焼開始までの時間、ひいて
は完全燃焼に要する時間を大幅に短縮したところ
にある。従つてこうした特徴を有効に発揮し得る
限り、ガス燃料の供給手段や粉体燃料の吹込み位
置等は必要に応じて任意に変更することができ
る。たとえばガス燃料の供給手段としては、第２
図に示した様に多重管構造の外管７ｂ側を活用す
る方法のほか、たとえば第４図Ａ，Ｂ〔何れも横
断面図〕に示す如く、粉体燃料吹込用バーナ７の
外周をとりまく様に設けたガス燃料供給管１５
〔第４図Ａは一体取付け型、第４図Ｂは別体取付
け型を示す〕等を使用することも勿論可能であ
る。また第１図の例では、粉体燃料吹込用バーナ
７をブローパイプ１０内へ突込んで挿設し、該バ
ーナ７の先端をブローパイプ１０内に開口した例
を示したが、本発明では前述の如く粉体燃料の燃
焼時間を著しく短縮し、吹込み後即座に着火・燃
焼し得る様に構成されているので、たとえば第５
図Ａ，Ｂ〔何れも縦断面図〕に示す如く、粉体燃
料吹込用バーナ７の先端を羽口１１内に臨ませた
り、更には羽口１１からレースウエイＬを臨む位
置まで突出させることも可能である。この場合バ
ーナ７はかなり高温にさらされるのでガス燃料供
給管を含めて耐熱材を使用すべきであることは当
然であり、必要によつては水冷構造とすることも
可能である。 The present invention is configured as described above, but its greatest feature is that powdered fuel and gas fuel are supplied independently,
The gaseous fuel is immediately combusted by high-temperature hot air, and the combustion heat rapidly heats the powdered fuel. This accelerates the volatilization and ignition of the volatile matter in the powdered fuel, and increases the speed until the start of combustion. The result is a significant reduction in the time required for complete combustion. Therefore, as long as these features can be effectively exhibited, the gas fuel supply means, the powder fuel injection position, etc. can be changed as desired. For example, as a gas fuel supply means, the second
In addition to the method of utilizing the outer tube 7b side of the multi-tube structure as shown in the figure, for example, as shown in FIG. Gas fuel supply pipe 15 installed in the same manner
[FIG. 4A shows an integrally mounted type, FIG. 4B shows a separately mounted type] etc. can of course be used. In the example shown in FIG. 1, the burner 7 for blowing powdered fuel is inserted into the blow pipe 10, and the tip of the burner 7 is opened in the blow pipe 10. The combustion time of the powdered fuel is significantly shortened as shown in the figure, and it is configured so that it can be ignited and burned immediately after being blown into the fuel.
As shown in Figures A and B (both longitudinal cross-sectional views), the tip of the burner 7 for blowing powdered fuel can be made to face into the tuyere 11, or even to protrude from the tuyere 11 to a position where it faces the raceway L. is also possible. In this case, since the burner 7 is exposed to a considerably high temperature, it is natural that heat-resistant materials should be used including the gas fuel supply pipe, and if necessary, a water-cooled structure may be used.
［発明の効果］
本発明は以上の様に構成されており、その効果
を要約すれば次の通りである。[Effects of the Invention] The present invention is configured as described above, and its effects can be summarized as follows.
(1) 熱風温度が低い場合でも粉体燃料の燃焼率を
満足のいく程度まで高めることができ、粉体燃
料の多量吹込みが可能となり、大幅な燃料コス
トダウンになる。また、高温の熱風温度が得ら
れ難いときでも粉体燃料を有効に活用すること
ができる。(1) Even when the hot air temperature is low, the combustion rate of powdered fuel can be increased to a satisfactory level, and a large amount of powdered fuel can be injected, resulting in a significant reduction in fuel costs. Moreover, powdered fuel can be effectively utilized even when it is difficult to obtain hot air at a high temperature.
(2) 熱風温度を積極的に下げて高炉操業を行なう
こともでき、省エネルギーとなるばかりでなく
ダクト等を含めた耐火物の劣化も抑制すること
が可能となる。(2) It is also possible to operate the blast furnace by actively lowering the hot air temperature, which not only saves energy but also suppresses deterioration of refractories including ducts.
(3) 燃焼率を十分に高め得るところから安価な微
粉炭の使用比率を高めることが可能となり、燃
料費の低減を図ることができる。(3) Since the combustion rate can be sufficiently increased, it is possible to increase the usage ratio of inexpensive pulverized coal, and it is possible to reduce fuel costs.
(4) 燃焼率が高レベルで安定するので高炉々況の
安定性も高めることができ、高炉操業効率も向
上する。(4) Since the combustion rate is stabilized at a high level, the stability of blast furnace conditions can also be improved, and blast furnace operating efficiency can also be improved.
(5) 本発明を実施するに当たり別途必要となるの
は多重構造のバーナだけであり、或はその他ガ
ス燃料吹込用装置だけであり、負担増は少な
い。(5) To carry out the present invention, only burners with a multi-layered structure or other gas fuel injection devices are required, so the increase in burden is small.
(6) ガス燃料のうち、最も燃焼速度が高く最適な
コークス炉ガスは、高炉装入原料として欠くこ
とのできないコークス製造工程で生成するもの
であり、通常は高炉設備に隣接して設けられて
いるので安価に入手することができる。(6) Among gas fuels, coke oven gas, which has the highest combustion rate and is most suitable, is produced in the coke manufacturing process, which is essential as a raw material for blast furnace charging, and is usually installed adjacent to blast furnace equipment. Because it is available, it can be obtained cheaply.
(7) 固体燃料とガス燃料とが独立して吹込まれる
ので、それぞれの流量制御が容易である。(7) Since solid fuel and gas fuel are injected independently, it is easy to control the flow rates of each.
(8) ガス燃料が冷却ガスとなり、バーナの寿命を
増すことができる。(8) The gas fuel becomes a cooling gas, which can extend the life of the burner.
(9) 粉体燃料の吹込位置を高炉レースウエイに対
して可及的近い位置に設定できるので、ブロー
パイプ内への灰分付着という欠陥の発生を大幅
に抑制することができる。(9) Since the injection position of powdered fuel can be set as close as possible to the blast furnace raceway, the occurrence of defects such as ash adhesion inside the blow pipe can be significantly suppressed.
第１図は実験で用いた燃焼装置を示す説明図、
第２図は本発明を実施する際に用いられる多重構
造のバーナを例示する一部破断側面図、第３図は
本発明の効果を従来例と対比して示すグラフ、第
４図Ａ，Ｂは本発明で使用するバーナの他の例を
示す横断面図、第５図Ａ，Ｂはバーナの他の挿設
例を示す横断面略図である。
Ａ……粉体燃料、Ｃ……コークス炉ガス、１…
…地上ホツパー、２……スクリユーコンベア、３
……コールビン、４……定量供給機、５……輸送
空気、６……輸送管、７……バーナ、８……高温
熱風炉、９……送風管、１０……ブローパイプ、
１１……水冷羽口、１２……燃焼試験炉、１３…
…煙突、１４……のぞき窓、７ａ……内管、７ｂ
……外管。
Figure 1 is an explanatory diagram showing the combustion device used in the experiment.
Fig. 2 is a partially cutaway side view illustrating a multi-structure burner used in carrying out the present invention, Fig. 3 is a graph showing the effects of the present invention in comparison with a conventional example, and Figs. 4 A and B. 5 is a cross-sectional view showing another example of the burner used in the present invention, and FIGS. 5A and 5B are schematic cross-sectional views showing other examples of burner insertion. A... Powdered fuel, C... Coke oven gas, 1...
...Ground hopper, 2...Screw conveyor, 3
...Coal bottle, 4...Quantitative feeder, 5...Transport air, 6...Transport pipe, 7...Burner, 8...High temperature hot blast furnace, 9...Blow pipe, 10...Blow pipe,
11...Water-cooled tuyere, 12...Combustion test furnace, 13...
...Chimney, 14...Peephole, 7a...Inner pipe, 7b
...Outer tube.
Claims (1)
パイプから供給される熱風温度を810℃以上に調
整すると共に、粉体燃料吹込管と平行してガス燃
料吹込管を配設し、粉体燃料とガス燃料の混焼を
行なわせつつ高炉内へ吹込むことを特徴とする高
炉への粉体燃料吹込方法。1. When blowing powdered fuel into the blast furnace, the temperature of the hot air supplied from the blow pipe is adjusted to 810°C or higher, and a gas fuel injection pipe is installed in parallel with the powdered fuel injection pipe. A method for injecting powdered fuel into a blast furnace, characterized by injecting powdered fuel into the blast furnace while co-firing the fuel and gas fuel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61-71608 | 1986-03-28 | ||
| JP7160886 | 1986-03-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6311608A JPS6311608A (en) | 1988-01-19 |
| JPH0129847B2 true JPH0129847B2 (en) | 1989-06-14 |
Family
ID=13465533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7336187A Granted JPS6311608A (en) | 1986-03-28 | 1987-03-26 | Method for blowing power fuel into blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6311608A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006233332A (en) * | 2005-01-31 | 2006-09-07 | Jfe Steel Kk | Blast furnace operation method |
| WO2012098715A1 (en) | 2011-01-18 | 2012-07-26 | Ｊｆｅスチール株式会社 | Method for operating blast furnace |
| WO2012098713A1 (en) | 2011-01-18 | 2012-07-26 | Ｊｆｅスチール株式会社 | Method for operating blast furnace |
| WO2012098714A1 (en) | 2011-01-18 | 2012-07-26 | Ｊｆｅスチール株式会社 | Blast furnace operation method |
| WO2015029424A1 (en) | 2013-08-28 | 2015-03-05 | Ｊｆｅスチール株式会社 | Method for operating blast furnace |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5824813B2 (en) * | 2010-01-19 | 2015-12-02 | Ｊｆｅスチール株式会社 | Blast furnace operation method |
| JP5824811B2 (en) * | 2010-01-19 | 2015-12-02 | Ｊｆｅスチール株式会社 | Blast furnace operation method |
| JP5824812B2 (en) * | 2010-01-19 | 2015-12-02 | Ｊｆｅスチール株式会社 | Blast furnace operation method |
| JP2011168885A (en) * | 2010-01-19 | 2011-09-01 | Jfe Steel Corp | Blast furnace operation method |
| JP6003535B2 (en) * | 2012-10-31 | 2016-10-05 | Ｊｆｅスチール株式会社 | Blast furnace operation method and blast furnace tuyere lance |
| JP6034313B2 (en) * | 2014-01-08 | 2016-11-30 | Ｊｆｅスチール株式会社 | Combined lance for blast furnace tuyere |
-
1987
- 1987-03-26 JP JP7336187A patent/JPS6311608A/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006233332A (en) * | 2005-01-31 | 2006-09-07 | Jfe Steel Kk | Blast furnace operation method |
| WO2012098715A1 (en) | 2011-01-18 | 2012-07-26 | Ｊｆｅスチール株式会社 | Method for operating blast furnace |
| WO2012098713A1 (en) | 2011-01-18 | 2012-07-26 | Ｊｆｅスチール株式会社 | Method for operating blast furnace |
| WO2012098714A1 (en) | 2011-01-18 | 2012-07-26 | Ｊｆｅスチール株式会社 | Blast furnace operation method |
| WO2015029424A1 (en) | 2013-08-28 | 2015-03-05 | Ｊｆｅスチール株式会社 | Method for operating blast furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6311608A (en) | 1988-01-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6067916A (en) | Process and device for producing and utilizing gas from waste materials | |
| TWI481721B (en) | Blast furnace operation method | |
| JPH0129847B2 (en) | ||
| US4259081A (en) | Process of calcining limestone in a rotary kiln | |
| JP4642972B2 (en) | Combustion process applicable to cement production | |
| TWI484041B (en) | Blast furnace operation method | |
| CN105026333A (en) | Method for burning lump material | |
| RU2379237C1 (en) | Burning of solid fuel for industrial melting with slag-forming fire chamber | |
| KR101223319B1 (en) | Solid fuel boiler for perfect combustion | |
| JPS6332842B2 (en) | ||
| CN109539240A (en) | A kind of non-forming biomass combustion device | |
| JPH0126445B2 (en) | ||
| CN101479530B (en) | Oxygenated Combustion of Unburned Carbon in Ash | |
| JP4077584B2 (en) | Method of injecting fuel gas into a waste melting furnace | |
| RU2174649C2 (en) | Pulverized-coal lighting-up burner and method of its operation | |
| US4780136A (en) | Method of injecting burning resistant fuel into a blast furnace | |
| JP2005213591A (en) | Solid fuel injection method and injection lance for blast furnace | |
| JP3742441B2 (en) | Method for adjusting combustion temperature in shaft furnace type waste melting furnace | |
| JP5981696B2 (en) | Gasification melting equipment melting furnace | |
| WO1997049954A1 (en) | Burning/melting method of waste melting furnace | |
| RU2265774C1 (en) | Method and device for treating solid waste | |
| JPH0129846B2 (en) | ||
| CA2096615A1 (en) | Carbon black enriched combustion | |
| JP2005264189A (en) | Method of injecting solid fuel into the blast furnace | |
| KR101471636B1 (en) | Pellet Combustion Device and Method for Low-Emission |