JPH0313288B2 - - Google Patents
Info
- Publication number
- JPH0313288B2 JPH0313288B2 JP10861586A JP10861586A JPH0313288B2 JP H0313288 B2 JPH0313288 B2 JP H0313288B2 JP 10861586 A JP10861586 A JP 10861586A JP 10861586 A JP10861586 A JP 10861586A JP H0313288 B2 JPH0313288 B2 JP H0313288B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- blast furnace
- temperature
- exhaust gas
- pulverized coal
- 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
- 239000007789 gas Substances 0.000 claims description 47
- 239000003245 coal Substances 0.000 claims description 21
- 238000002485 combustion reaction Methods 0.000 claims description 21
- 239000012159 carrier gas Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000032258 transport 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)
- Air Transport Of Granular Materials (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、高炉吹込み用微粉炭を搬送方法に関
し、特に粉砕、乾燥した微粉炭を主として貯蔵槽
まで搬送するキヤリアガスとして、高炉用熱風炉
の燃焼排ガスを利用する技術についての提案であ
る。Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a method for transporting pulverized coal for blast furnace injection, and in particular to a method for transporting pulverized coal to a hot blast furnace for blast furnaces as a carrier gas for mainly transporting pulverized and dried pulverized coal to a storage tank. This is a proposal for technology that utilizes combustion exhaust gas.
（従来の技術）
送風羽口を通じて高炉内に吹込む微粉炭は、例
えば特開昭59−211512号公報に記載されているよ
うに、不活性ガスで搬送する。この際、石炭が粉
砕、乾燥されていないような場合、搬送の途中で
粉砕と乾燥ができるように、そして安価で不活性
なキヤリアガスとして、ガス燃焼炉の燃焼排ガス
を使うのが普通である。(Prior Art) Pulverized coal that is blown into a blast furnace through a blowing tuyere is conveyed using an inert gas, as described in, for example, Japanese Patent Application Laid-Open No. 59-211512. At this time, if the coal has not been pulverized and dried, it is common to use combustion exhaust gas from a gas combustion furnace as an inexpensive and inert carrier gas so that the coal can be pulverized and dried during transportation.
すなわち、第２図は燃焼排ガスを使う既知技術
を例示するものである。石炭はまず粉砕乾燥機１
に入れられる。この粉砕乾燥機１内には別の用途
に供せられるガス燃焼炉２から発生する燃焼排ガ
ス（CO2：20〜50％、CO：０〜２％、N2：残）
を導入する。そして、この燃焼排ガス（100〜400
℃）は粉砕した微粉炭を乾燥すると同時にこのガ
スをキヤリアガスとして微粉炭捕集器３、貯蔵槽
４内にまで搬送し、引き続き空気などを使つて送
風羽口を通じて高炉１内に吹込んでいる。 That is, FIG. 2 illustrates a known technique that uses flue gas. Coal is first crushed and dried in 1
can be placed in This pulverizing dryer 1 contains combustion exhaust gas ( CO2 : 20-50%, CO: 0-2%, N2 : remainder) generated from a gas combustion furnace 2 that is used for another purpose.
will be introduced. And this combustion exhaust gas (100 to 400
℃) dries the crushed pulverized coal and at the same time transports this gas as a carrier gas into the pulverized coal collector 3 and storage tank 4, and then blows it into the blast furnace 1 through the blast tuyere using air or the like.
ところで、上記粉砕乾燥器１内に導入する燃焼
排ガスの流量や温度は、高炉の操業状態の影響を
受けて変動する処理すべき石炭の量に応じて変動
させなければならないが、N2を使うかブリーダ
ー５及び冷風（空気）の導入によつて対処してい
るものの種々の問題点があつた。 By the way, the flow rate and temperature of the combustion exhaust gas introduced into the pulverizer dryer 1 must be varied depending on the amount of coal to be treated, which varies depending on the operational status of the blast furnace. Although this problem was solved by introducing a bleeder 5 and cold air (air), various problems arose.
（発明が解決しようとする問題点）
上記燃焼排ガスの温度、流量制御は、前記ガス
燃焼炉２が専用機の場合、キヤリアガスの温度計
６により指示を該炉２のバーナーにフイードバツ
クすれば足りるが、それでも残存する炉熱のため
に応答性が悪く実用的でない。(Problems to be Solved by the Invention) For controlling the temperature and flow rate of the combustion exhaust gas, if the gas combustion furnace 2 is a dedicated machine, it is sufficient to feed back instructions from the carrier gas thermometer 6 to the burner of the furnace 2. However, due to the residual furnace heat, the response is poor and it is not practical.
また、ガス燃焼炉２が本来の目的として他の用
途を持つている場合には、高炉操業変動に追随さ
せてバーナーを制御（燃焼ガス量、温度の変動）
をすることはできず、高価につくN2を使うか、
ブリーダー５や冷風の導入で対処するものの、冷
風量が多くなるとO2の富化につながり、高温微
粉炭と結びつくと爆発が懸念され、またブリーダ
ー５からの放出では大巾なエネルギー損となる問
題点があつた。 In addition, if the gas combustion furnace 2 has other purposes as its original purpose, the burner can be controlled to follow the fluctuations in blast furnace operation (fluctuations in combustion gas amount and temperature).
You can't use N2 , which is expensive, or
Although this problem can be solved by introducing bleeder 5 or cold air, if the amount of cold air increases, it will lead to enrichment of O 2 , and if it combines with high-temperature pulverized coal, there is a concern about explosion, and if it is released from bleeder 5, it will cause a large amount of energy loss. The point was hot.
本発明の目的はかかる従来技術が抱える問題点
を克服できる微粉炭搬送方法を開発するところに
ある。 An object of the present invention is to develop a method for transporting pulverized coal that can overcome the problems faced by the prior art.
（問題点を解決するための手段）
従来技術が抱える上述した問題点を克服するた
めの有効な手段として本発明は、基本的には高炉
に付属している熱風炉の燃焼排ガスをキヤリアガ
スとして使うことにあり、しかも熱交換器の前・
後から採り出した高温、低温のガスを原則的には
混合し又は必要に応じてどちらか一方を単独で使
う方法を開発した。すなわち本発明は、
燃焼排ガスをキヤリアガスとすることにより、
吹込み炭を搬送途中で乾燥し、引き続き貯蔵槽を
経て高炉送風羽口まで搬送するに当たり、前記キ
ヤリアガスとして、熱風炉燃焼排ガスの熱交換の
前後における高温ガスおよび低温ガスによる温度
調節可能なミツクスガスを使うことを特徴とする
高炉吹込み用微粉炭の搬送方法、を上記課題解決
手段とする。(Means for Solving the Problems) As an effective means for overcoming the above-mentioned problems of the prior art, the present invention basically uses combustion exhaust gas from a hot blast furnace attached to a blast furnace as a carrier gas. In particular, in front of the heat exchanger
We have developed a method that basically mixes high-temperature and low-temperature gases extracted later, or uses either one alone as needed. That is, in the present invention, by using combustion exhaust gas as a carrier gas,
When the blown coal is dried during transportation and subsequently transported to the blast furnace blowing tuyere via a storage tank, mix gas whose temperature can be adjusted by high temperature gas and low temperature gas before and after heat exchange of hot blast furnace combustion exhaust gas is used as the carrier gas. A method for transporting pulverized coal for blast furnace injection, which is characterized in that it is used, is a means for solving the above problem.
（作用）
高炉用熱風炉７には、燃焼用空気を予熱するた
めに、熱風炉燃焼排ガス管系に熱交換器８を設置
しているのが普通である。その入側排ガス管９ａ
の排ガス温度は約350℃、出側排ガス管９ｂでの
それは約150℃である。(Function) In the blast furnace hot blast furnace 7, a heat exchanger 8 is usually installed in the hot blast furnace combustion exhaust gas pipe system in order to preheat the combustion air. The inlet exhaust gas pipe 9a
The exhaust gas temperature at the exhaust gas pipe 9b is approximately 350°C, and that at the outlet exhaust gas pipe 9b is approximately 150°C.
要するに本発明は、前記入側、出側排ガス管９
ａ，９ｂからそれぞれ高温、低温のガスを取り出
し、これを上記微粉炭キヤリアガスとしようとす
るものである。また、さらにガス燃焼炉２を必要
に応じて併用しようとするものである。 In short, the present invention provides the inlet and outlet exhaust gas pipes 9
High-temperature and low-temperature gases are taken out from a and 9b, respectively, and used as the pulverized coal carrier gas. Furthermore, the gas combustion furnace 2 is also intended to be used in combination as necessary.
こうした着想の下で本発明は、粉砕乾燥後の地
点Ａにおけるキヤリアガスが温度：約100〜120
℃、O2濃度：10％以下、好ましくは２〜６％に
なるように制御すべく、上記入側、出側排ガス管
からの混合すべきガス量を調整することとした。
なお、酸素はブロワー１０でのサクシヨンに伴う
粉砕乾燥機１でリークする空気によるものであ
る。 Based on this idea, the present invention has been developed so that the carrier gas at point A after pulverization and drying has a temperature of about 100 to 120.
The amount of gas to be mixed from the inlet and outlet exhaust gas pipes was adjusted to control the temperature to 10% or less, preferably 2 to 6%.
Note that the oxygen is due to air leaking from the crushing dryer 1 due to suction in the blower 10.
（実施例）
第１図は本発明の好適実施例を示すもので、粉
砕乾燥機（ロツシユミル）１に導入するガスとし
て、入側排ガス管９ａから分岐した高温ガス管１
１の高温ガス（350℃）と出側排ガス管９ｂから
分岐した低温ガス管１２の低温ガス（150℃）を
１：１の割合で混合した約250℃のものを用いた。
この混合ガス25000Nm3／〓を前記粉砕乾燥機１
に導入すると、地点Ａでは温度：95℃、O2：３
％の微粉炭含有ガスとなり、サイクロンを経て安
全に貯蔵槽４まず搬送できた。(Embodiment) FIG. 1 shows a preferred embodiment of the present invention, in which a high-temperature gas pipe 1 branched from an inlet exhaust gas pipe 9a is used as the gas introduced into the crushing dryer (rotushi mill) 1.
A mixture of high-temperature gas (350°C) from No. 1 and low-temperature gas (150°C) from low-temperature gas pipe 12 branched from outlet exhaust gas pipe 9b at a ratio of 1:1 was used.
This mixed gas of 25000Nm 3 /〓 is passed through the pulverizing dryer 1
temperature at point A: 95℃, O 2 : 3
% of pulverized coal, and was safely transported to storage tank 4 through a cyclone.
（発明の効果）
以上説明したように本発明によれば、N2など
の稀釈用不活性ガスを用いることなく、また専用
のガス燃焼炉を用いることなく、そして石炭を粉
砕−乾燥−搬送する工程を全て熱風炉の燃焼排ガ
スだけで賄うことができるので経済的であり、ま
た高温段階では空気を使わないので安全な取扱い
が保証される。(Effects of the Invention) As explained above, according to the present invention, coal can be crushed, dried, and transported without using an inert gas for dilution such as N 2 or without using a dedicated gas combustion furnace. It is economical because the entire process can be carried out using only the combustion exhaust gas from the hot air stove, and since no air is used in the high temperature stage, safe handling is guaranteed.
第１図は、本発明の実施状態を示す高炉微粉炭
吹込み設備例の略線図、第２図は、従来の微粉炭
吹込み設備の略線図である。
１……粉砕乾燥機、２……ガス燃焼炉、３……
捕集器、４……貯蔵槽、５……ブリーダー、６…
…温度計、７……熱風炉、８……熱交換器、９
ａ，９ｂ……排ガス管、１０……ブロワー、１１
……高温ガス管、１２……低温ガス管。
FIG. 1 is a schematic diagram of an example of blast furnace pulverized coal injection equipment showing an implementation state of the present invention, and FIG. 2 is a schematic diagram of a conventional pulverized coal injection equipment. 1... Grinding dryer, 2... Gas combustion furnace, 3...
Collector, 4...Storage tank, 5...Bleeder, 6...
...Thermometer, 7...Hot stove, 8...Heat exchanger, 9
a, 9b...Exhaust gas pipe, 10...Blower, 11
...High temperature gas pipe, 12...Low temperature gas pipe.
Claims (1)
り、吹込み炭を搬送途中で乾燥し、引き続き貯蔵
槽を経て高炉送風羽口まで搬送するに当たり、前
記キヤリアガスとして、熱風炉燃焼排ガスの熱交
換の前後における高温ガスおよび低温ガスによる
温度調節可能なミツクスガスを使うことを特徴と
する高炉吹込み用微粉炭の搬送方法。1 By using the combustion exhaust gas as a carrier gas, the blown coal is dried during transportation, and when it is subsequently conveyed to the blast furnace blowing tuyere via the storage tank, the high temperature gas before and after heat exchange of the hot blast furnace combustion exhaust gas is used as the carrier gas. and a method for transporting pulverized coal for blast furnace injection, characterized by using mix gas whose temperature can be adjusted using low-temperature gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10861586A JPS62267404A (en) | 1986-05-14 | 1986-05-14 | Method for conveying pulverized coal to be blown in to blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10861586A JPS62267404A (en) | 1986-05-14 | 1986-05-14 | Method for conveying pulverized coal to be blown in to blast furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62267404A JPS62267404A (en) | 1987-11-20 |
| JPH0313288B2 true JPH0313288B2 (en) | 1991-02-22 |
Family
ID=14489285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10861586A Granted JPS62267404A (en) | 1986-05-14 | 1986-05-14 | Method for conveying pulverized coal to be blown in to blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62267404A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU88763A1 (en) * | 1996-05-30 | 1997-11-30 | Kuettner Gmbh & Co Kg Dr | Method and device for blowing coal in a shaft furnace |
| WO2001004030A1 (en) * | 1999-07-08 | 2001-01-18 | Nkk Corporation | Method and device for cutting out and transporting powder and granular material |
| CN109353825B (en) * | 2018-12-11 | 2023-07-18 | 鞍钢集团工程技术有限公司 | Powdery material preheating pneumatic conveying device and process |
-
1986
- 1986-05-14 JP JP10861586A patent/JPS62267404A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62267404A (en) | 1987-11-20 |
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