JPH0233764B2 - - Google Patents
Info
- Publication number
- JPH0233764B2 JPH0233764B2 JP56180641A JP18064181A JPH0233764B2 JP H0233764 B2 JPH0233764 B2 JP H0233764B2 JP 56180641 A JP56180641 A JP 56180641A JP 18064181 A JP18064181 A JP 18064181A JP H0233764 B2 JPH0233764 B2 JP H0233764B2
- Authority
- JP
- Japan
- Prior art keywords
- pulverized coal
- gas
- blast furnace
- feed pipe
- sec
- 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 - Lifetime
Links
- 239000003245 coal Substances 0.000 claims description 48
- 239000007789 gas Substances 0.000 claims description 28
- 239000012159 carrier gas Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 238000007664 blowing Methods 0.000 claims description 12
- 239000012530 fluid Substances 0.000 description 14
- 239000000463 material Substances 0.000 description 9
- 238000004880 explosion Methods 0.000 description 6
- 239000000843 powder Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000010959 steel Substances 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
Description
【発明の詳細な説明】
本発明は微粉炭を高炉内へ吹込む方法に関し、
更に詳述すればノズルと送給管との摩耗を防止
し、燃焼性を高め得る微粉炭吹込み方法に関す
る。[Detailed description of the invention] The present invention relates to a method of injecting pulverized coal into a blast furnace,
More specifically, the present invention relates to a pulverized coal injection method that can prevent wear between a nozzle and a feed pipe and improve combustibility.
従来、微粉炭を高炉内へ羽口から吹き込む場
合、キヤリアガスとして空気を用いていた。この
空気と微粉炭との混合流体は、常に爆発の危険性
を有しているのでその安全対策が必要である。ま
たその混合流体の火炎伝播速度は約10〜20ｍ／秒
と非常に速いので、微粉炭を羽口先の燃焼空間に
吹き込む場合における空気微粉炭混合流体の輸送
管内通過時及び吹出し時の流速は、逆火を防止す
るために20ｍ／秒以上とする必要があつた。この
ように微粉炭を高速輸送して高炉内へ吹き込む場
合には、次に掲げるような問題点がある。 Conventionally, when blowing pulverized coal into a blast furnace through a tuyere, air was used as a carrier gas. This mixed fluid of air and pulverized coal always has the risk of explosion, so safety measures are required. In addition, the flame propagation velocity of the mixed fluid is very fast, approximately 10 to 20 m/sec, so when the pulverized coal is blown into the combustion space at the tip of the tuyere, the flow velocity of the air-pulverized coal mixed fluid when it passes through the transport pipe and when it is blown out is as follows: To prevent backfire, it was necessary to set the speed to 20 m/sec or more. When pulverized coal is transported at high speed and blown into a blast furnace in this way, there are the following problems.
(1) 微粉炭による輸送ラインの関内壁及び吹込み
ノズルの摩耗が激しい。即ち空気微粉炭混合流
体の流速の約３乗に比例して管内摩耗量が増大
するので、その流速を20ｍ／秒以上の高速にす
る場合は、管内摩耗量が著しく、それに対処す
べく、送給管曲部、各羽口の吹込みノズル等に
は高価な高耐摩耗性材料、例えばセルフライニ
ング材、ポリエチレン材、バサルト材等を用い
る必要がある。(1) Severe wear on the inner wall and injection nozzle of the transportation line due to pulverized coal. In other words, the amount of wear inside the tube increases in proportion to the third power of the flow rate of the air-pulverized coal mixed fluid, so when the flow rate is increased to a high speed of 20 m/sec or more, the amount of wear inside the tube becomes significant, and in order to cope with this, the amount of wear inside the tube increases. It is necessary to use expensive and highly wear-resistant materials such as self-lining materials, polyethylene materials, basalt materials, etc. for the supply pipe bends, the blowing nozzles of each tuyere, and the like.
(2) 微粉炭吹込み速度が速いためにレースウエイ
空間内での微粉炭の滞留時間が短かくなり、未
燃焼物がレースウエイ壁に溜まり、通気阻害を
起こし易くなる。(2) Because the pulverized coal injection speed is high, the residence time of pulverized coal in the raceway space is shortened, and unburnt materials accumulate on the raceway wall, which tends to cause ventilation obstruction.
本発明は斯かる問題点を解消するためになされ
たものであり、N2ガスを利用して設備の簡素化、
長寿命化を図ると共に燃焼性を高めた微粉炭吹込
み方法を提供することを目的とする。 The present invention was made to solve such problems, and uses N2 gas to simplify equipment and
The purpose of the present invention is to provide a method for injecting pulverized coal that has a long life and improved combustibility.
本発明に係る高炉への微粉炭吹込み方法は、
N2ガス含有量が90％以上のN2ガス（以下単にN2
ガスという）をキヤリアガスとし、微粉炭を高炉
羽口へ5m／秒を超え、20m／秒未満の速度にて
送給した後、高炉羽口に装着した吹込みノズルに
より、その微粉炭を高炉内へ低吹込み速度にて吹
き込むことを特徴とする。なお本発明におけるキ
ヤリアガスとしてN2ガス含有量が90％以上のN2
ガスを使用するのは、微粉炭供給時の爆発の危険
性をなくすためであり、少なくともN2ガス含有
量が90％以上であることがよいと判明したからで
ある。 The method for injecting pulverized coal into a blast furnace according to the present invention includes:
N2 gas with N2 gas content of 90% or more (hereinafter simply N2
After feeding the pulverized coal to the blast furnace tuyeres at a speed of more than 5 m/s and less than 20 m/s using the carrier gas, the pulverized coal is transported into the blast furnace using the blowing nozzle attached to the blast furnace tuyeres. It is characterized by blowing at a low blowing speed. Note that N 2 with an N 2 gas content of 90% or more is used as the carrier gas in the present invention.
The reason for using gas is to eliminate the risk of explosion when pulverized coal is supplied, and it has been found that it is better to have at least a N 2 gas content of 90% or more.
以下本発明方法を実施例を示す図面に基づいて
詳細に説明する。第１図は本発明方法の実施状態
を示す模式図であり、出入口を除き密閉された均
圧ホツパ１には、粉砕機（図示せず）にて石炭を
粉砕してなる微粉炭が供給ライン２を経て搬送供
給され、一方N2ガスも、図示しないガスタンク
に連結されたキヤリアガス供給管３から分岐され
た均圧ライン４を経て供給され、前記微粉炭は均
圧ホツパ１内に加圧された状態にて貯留される。
均圧ホツパ１の下方には、出入口を除き密閉され
た切出しホツパ５が設置されており、均圧ホツパ
１の下部に設けられた均圧ホツパ出口１ａと切出
しホツパ５の上部に設けられた切出しホツパ入口
５ａとが、供給バルブ６を介して連結されてお
り、この供給バルブ６が開栓されることにより均
圧ホツパ１と切出しホツパ５とが連通され、微粉
炭に作用する重力と均圧ホツパ１内の圧力とによ
り均圧ホツパ１内に貯留された微粉炭が切出しホ
ツパ５内へ供給される。更に切出しホツパ５に
も、N2ガスが前記均圧ライン４を経て供給され
てそ内部が加圧されるようになつており、切出し
ホツパ５の下部に設けられた切出しホツパ出口５
ｂに取り付けられた切出しバルブ７を作動させる
ことにより、その切出し力と切出しホツパ５内の
圧力とにより切出しホツパ５内の微粉末を必要量
だけ切り出す。そして前記キヤリアガス供給管３
に連通し、上記切出しバルブ７が連結された微粉
炭送給管８の内部へ微粉末を供給する。斯くして
微粉炭送給管８内へ供給された微粉炭は、図示し
ないガスタンクからキヤリアガス供給管３を経由
して供給されたN2ガスと共にN2ガス微粉炭混合
流体を生成する。そしてこの混合流体は、上記微
粉炭送給管８が分岐した複数の分岐管９へ分配さ
れた後、高炉の各羽口へ送給される。そして高炉
の各羽口へ送給されたN2ガス微粉炭混合流体が
各羽口に装着された吹込みノズルを通流して高炉
内へ吹き込まれ、羽口にて送給された燃焼用空気
によつて燃焼される。 Hereinafter, the method of the present invention will be explained in detail based on the drawings showing examples. FIG. 1 is a schematic diagram showing the implementation state of the method of the present invention. Pulverized coal obtained by pulverizing coal in a pulverizer (not shown) is supplied to the pressure equalizing hopper 1, which is sealed except for the entrance and exit, through the supply line. On the other hand, N2 gas is also supplied via a pressure equalization line 4 branched from a carrier gas supply pipe 3 connected to a gas tank (not shown), and the pulverized coal is pressurized into the pressure equalization hopper 1. It is stored in the same condition.
A cutting hopper 5 is installed below the pressure equalizing hopper 1, which is sealed except for the entrance and exit. The hopper inlet 5a is connected to the hopper inlet 5a via a supply valve 6, and when the supply valve 6 is opened, the pressure equalization hopper 1 and the cutting hopper 5 are communicated with each other, and the gravity acting on the pulverized coal and the pressure equalization The pulverized coal stored in the pressure equalizing hopper 1 is supplied into the cutting hopper 5 due to the pressure in the hopper 1 . Furthermore, N 2 gas is supplied to the cutting hopper 5 through the pressure equalization line 4 to pressurize the inside thereof, and a cutting hopper outlet 5 provided at the lower part of the cutting hopper 5 is connected to the cutting hopper 5 .
By operating the cutting valve 7 attached to b, the necessary amount of fine powder in the cutting hopper 5 is cut out by its cutting force and the pressure in the cutting hopper 5. and the carrier gas supply pipe 3
The fine powder is supplied to the inside of the pulverized coal feed pipe 8 to which the cut-off valve 7 is connected. The pulverized coal thus supplied into the pulverized coal feed pipe 8 generates an N 2 gas pulverized coal mixed fluid together with the N 2 gas supplied via the carrier gas supply pipe 3 from a gas tank (not shown). This mixed fluid is distributed to a plurality of branch pipes 9 into which the pulverized coal feed pipe 8 is branched, and then is delivered to each tuyere of the blast furnace. Then, the N2 gas pulverized coal mixed fluid sent to each tuyere of the blast furnace is blown into the blast furnace through the blowing nozzle attached to each tuyere, and the combustion air is sent by the tuyere. is burned by.
次に斯かる方法により微粉炭を高炉内へ吹き込
む場合の効果について以下に述べる。従来法にお
いては、微粉炭送給管８内へ供給される微粉炭
が、キヤリアガス供給管３を経由して供給される
空気と共に、空気微粉炭混合流体を生成し、その
混合流体が上述の場合と同様にして高炉内へ吹き
込まれるが、空気微粉炭混合流体は爆発の危険性
があり、またその火炎伝播速度は前述した如く10
〜20ｍ／秒と非常に速いので、逆火、爆発を防止
するために、その混合流体を20ｍ／秒以上の高速
にて送給吹込みを行う必要があつた。これに対し
て上述した如き本発明方法による場合は、空気に
替えてN2ガス含有量が90％以上のN2ガスを用い
るので、全く爆発の危険性のないN2ガス微粉炭
混合流体が生成される。従つてその混合流体を20
ｍ／秒よりも遅い速度にて送給吹込みを行うこと
が可能となる。一方、粉体を気体で輸送する場
合、送給速度の下限は、以下の点に於いて律速さ
れる。 Next, the effects of injecting pulverized coal into the blast furnace using this method will be described below. In the conventional method, the pulverized coal supplied into the pulverized coal feed pipe 8 generates an air-pulverized coal mixed fluid together with the air supplied via the carrier gas supply pipe 3, and when the mixed fluid is as described above. However, the air-pulverized coal mixed fluid has a risk of explosion, and the flame propagation speed is 10% as described above.
Since the speed is extremely high at ~20 m/sec, it was necessary to feed and blow the mixed fluid at a high speed of 20 m/sec or more to prevent backfire and explosion. On the other hand, in the case of the method of the present invention as described above, N2 gas with a N2 gas content of 90 % or more is used instead of air, so the N2 gas pulverized coal mixed fluid has no risk of explosion. generated. Therefore, the mixed fluid is 20
It becomes possible to carry out feed blowing at a speed lower than m/sec. On the other hand, when transporting powder in gas, the lower limit of the feeding rate is determined by the following points.
(1) 送給の安定性：送給速度を低下させすぎる
と、粉体が送給ラインを閉塞し、送給不能とな
る。(1) Feeding stability: If the feeding speed is reduced too much, the powder will block the feeding line, making feeding impossible.
(2) 送給圧力：送給速度が速いほど送給圧力が高
くなるのが一般的であるが、粉体輸送の特徴と
して、送給速度を低くしすぎても送給圧力が高
くなる。(2) Feeding pressure: Generally speaking, the faster the feeding speed, the higher the feeding pressure, but a characteristic of powder transportation is that even if the feeding speed is too low, the feeding pressure will increase.
微粉炭タンクから高炉羽口にいたる水平部、垂
直部、傾斜部、曲り部から構成される送給ライン
における微粉炭送給特性に関する試行検討の結
果、送給速度を５ｍ／秒超過にすることにより実
機に於ける微粉炭送給においても上記の問題を回
避できるとの結論に到達し、送給速度を５ｍ／秒
超過とすべきこととした。即ち本発明方法による
場合は、N2ガスをキヤリアガスとして、微粉炭
を５〜20ｍ／秒の低速度にて送給し、高炉内へ吹
き込むことが可能になるといえる。 As a result of a trial study on the pulverized coal feeding characteristics of the feeding line, which is comprised of horizontal, vertical, inclined, and curved sections, from the pulverized coal tank to the blast furnace tuyere, the feeding speed was set to exceed 5 m/sec. Therefore, it was concluded that the above-mentioned problem could be avoided even when feeding pulverized coal in an actual machine, and it was decided that the feeding speed should exceed 5 m/sec. That is, in the case of the method of the present invention, it is possible to feed pulverized coal at a low speed of 5 to 20 m/sec and blow it into the blast furnace using N2 gas as a carrier gas.
第２図は送給管内壁の摩耗量に対する送給管内
を通流する混合流体の流速の影響を、横軸に送給
管内流速をとり、縦軸に相対摩耗量をとつて示し
たグラフである。図において送給管内流速が20
ｍ／秒以上の場合は従来法に相当し、送給管内流
速が５〜20ｍ／秒の場合は本発明方法に相当する
が、送給管内流速が従来法と比して低速に抑える
ことができる本発明方法による場合は、送給管内
壁の摩耗量を著しく減少させることが分かる。例
えば送給管内流速が20ｍ／秒の場合と比して送給
管内流速が10ｍ／秒の場合は、送給管内壁の摩耗
量は約1/10に減少することが分かる。このように
送給管内流速を低速に抑えることができるので、
送給管曲部等に高価な高耐摩耗性材料を用いる必
要がなくなる。また羽口からの吹込み速度も低速
に抑えることができるので、上述の場合と同様、
羽口の吹出しノズル等に高価な高耐摩耗性材料を
用いる必要がなくなる上、微粉炭のレースウエイ
空間内での滞留時間が長くなり、微粉炭のレース
ウエイ空間内での完全燃焼が促進されて燃焼性が
高まるので、未燃物がレースウエイ壁に蓄積する
ことによる通気阻害が緩和されることとなる。 Figure 2 is a graph showing the effect of the flow velocity of the mixed fluid flowing through the supply pipe on the amount of wear on the inner wall of the supply pipe, with the horizontal axis representing the flow velocity in the supply pipe and the vertical axis representing the relative amount of wear. be. In the figure, the flow velocity in the feed pipe is 20
If the flow velocity in the feed pipe is 5 to 20 m/sec, it corresponds to the conventional method, and if the flow velocity in the feed pipe is 5 to 20 m/sec, it corresponds to the method of the present invention, but the flow velocity in the feed pipe can be kept low compared to the conventional method. It can be seen that when the method of the present invention is used, the amount of wear on the inner wall of the feed pipe is significantly reduced. For example, it can be seen that when the flow velocity in the feed pipe is 10 m/sec, the amount of wear on the inner wall of the feed pipe is reduced to about 1/10 compared to when the flow velocity in the feed pipe is 20 m/sec. In this way, the flow velocity in the feed pipe can be kept low, so
There is no need to use expensive, highly wear-resistant materials for bends in the feed pipe, etc. In addition, the blowing speed from the tuyere can be kept low, so as in the case above,
In addition to eliminating the need to use expensive, highly wear-resistant materials for the tuyere blow-off nozzles, etc., the residence time of pulverized coal within the raceway space is increased, and complete combustion of pulverized coal within the raceway space is promoted. Since the combustibility is improved, the obstruction of ventilation caused by the accumulation of unburned materials on the raceway walls is alleviated.
なおN2ガスとしてO2ガスが３％含有している
ものを用いることとすれば、高炉を有する製鉄所
内においては、転炉用O2ガスを製造するときの
副成物として充分な量のN2ガスが存在するので、
空気を圧縮してキヤリアガズとして用いる場合と
比してコスト的にも同等である。 If N 2 gas containing 3% O 2 gas is used, a sufficient amount of O 2 gas will be used as a by-product when producing O 2 gas for converters in steel works with blast furnaces. Since N2 gas is present,
The cost is also equivalent to that of compressing air and using it as a carrier gas.
またキヤリアガスを空気からN2ガスへ替える
ことによる高炉操業への影響は、高炉の各羽口か
ら高炉内へ吹き込まれる空気量に比してキヤリア
ガラスとしてのN2ガスの量は僅かであることか
ら、殆ど問題にならない。 In addition, the effect on blast furnace operation of changing the carrier gas from air to N 2 gas is that the amount of N 2 gas as the carrier glass is small compared to the amount of air blown into the blast furnace from each tuyere of the blast furnace. Since then, it's hardly a problem.
以上詳述した如く本発明は、微粉炭を高炉内へ
吹き込むにあたり、低純度のN2ガスをキヤリア
ガスとして用いるので、全く爆発の危険性がなく
なり、その安全対策が不要となる上、低速度にて
送給吹込みが行えるので、送給管曲部、各羽口の
吹込みノズル等の摩耗量を大幅に削減でき、それ
らの部分に高耐摩耗性材料を用いる必要がなくな
る。また低速度にて微粉炭を高炉内へ吹き込むこ
とができることから、レースウエイ空間における
通気阻害も緩和される。更にキヤリアガスを用い
て微粉炭を給送することとしているから、送給管
の配管角度についての制限も少なく水平配管等に
おいても微粉炭を滞留させることなく、給送する
ことが可能となる。従つて本発明は、高炉操業の
安全性確保、高炉安定操業の確保等を図る上で著
しい効果がある。 As detailed above, the present invention uses low-purity N2 gas as a carrier gas when blowing pulverized coal into the blast furnace, so there is no risk of explosion, no safety measures are required, and the flow rate is low. Since feeding and blowing can be carried out at the same time, it is possible to significantly reduce the amount of wear on the bending portion of the feed pipe, the blowing nozzle of each tuyere, etc., and there is no need to use highly wear-resistant materials in these parts. Furthermore, since pulverized coal can be blown into the blast furnace at a low speed, ventilation obstruction in the raceway space is alleviated. Furthermore, since the pulverized coal is fed using a carrier gas, there are few restrictions on the piping angle of the feed pipe, and it becomes possible to feed the pulverized coal without stagnation even in horizontal piping or the like. Therefore, the present invention has a significant effect in ensuring safety of blast furnace operation, stable blast furnace operation, etc.
第１図は本発明方法の実施状態を示す模式図、
第２図は送給管内壁摩耗量に対する送給管内を通
流する混合気体の流速の影響を示すグラフであ
る。
１……均圧ホツパ、５……切出しホツパ、６…
…供給バルブ、７……切出しバルブ、８……微粉
炭送給管。
FIG. 1 is a schematic diagram showing the implementation state of the method of the present invention,
FIG. 2 is a graph showing the influence of the flow rate of the mixed gas flowing through the feed pipe on the amount of wear on the inner wall of the feed pipe. 1... Equalizing pressure hopper, 5... Cutting hopper, 6...
...Supply valve, 7... Cut-out valve, 8... Pulverized coal feed pipe.
Claims (1)
羽口へ５ｍ／秒を超え、20ｍ／秒未満の速度にて
送給した後、高炉羽口に装着した吹込みノズルに
より、その微粉炭を高炉内へ吹き込むことを特徴
とする高炉への微粉炭吹込み方法。1 Using N2 gas as a carrier gas, the pulverized coal is fed to the blast furnace tuyere at a speed of more than 5 m/sec but less than 20 m/sec, and then the pulverized coal is transferred to the blast furnace using the blowing nozzle attached to the blast furnace tuyere. A method of injecting pulverized coal into a blast furnace, which is characterized by injecting pulverized coal into the blast furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18064181A JPS5881906A (en) | 1981-11-10 | 1981-11-10 | Process for blowing pulverized coal into blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18064181A JPS5881906A (en) | 1981-11-10 | 1981-11-10 | Process for blowing pulverized coal into blast furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5881906A JPS5881906A (en) | 1983-05-17 |
| JPH0233764B2 true JPH0233764B2 (en) | 1990-07-30 |
Family
ID=16086739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18064181A Granted JPS5881906A (en) | 1981-11-10 | 1981-11-10 | Process for blowing pulverized coal into blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5881906A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5776109A (en) * | 1980-10-31 | 1982-05-13 | Nippon Kokan Kk <Nkk> | Injection of fine powder coal into blast furnace and device therefor |
-
1981
- 1981-11-10 JP JP18064181A patent/JPS5881906A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5776109A (en) * | 1980-10-31 | 1982-05-13 | Nippon Kokan Kk <Nkk> | Injection of fine powder coal into blast furnace and device therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5881906A (en) | 1983-05-17 |
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