JPS6144112A - Method for controlling water blowing rate in blasting for humidification of blast furnace - Google Patents
Method for controlling water blowing rate in blasting for humidification of blast furnaceInfo
- Publication number
- JPS6144112A JPS6144112A JP59164220A JP16422084A JPS6144112A JP S6144112 A JPS6144112 A JP S6144112A JP 59164220 A JP59164220 A JP 59164220A JP 16422084 A JP16422084 A JP 16422084A JP S6144112 A JPS6144112 A JP S6144112A
- Authority
- JP
- Japan
- Prior art keywords
- water
- blast furnace
- temp
- cold wind
- hot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 238000007664 blowing Methods 0.000 title claims description 16
- 238000000034 method Methods 0.000 title claims description 11
- 238000005422 blasting Methods 0.000 title 1
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 239000011449 brick Substances 0.000 abstract description 8
- 230000006378 damage Effects 0.000 abstract description 3
- 208000027418 Wounds and injury Diseases 0.000 abstract 1
- 208000014674 injury Diseases 0.000 abstract 1
- 230000008929 regeneration Effects 0.000 abstract 1
- 238000011069 regeneration method Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 241001385733 Aesculus indica Species 0.000 description 1
- 101100540419 Danio rerio kdrl gene Proteins 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009423 ventilation Methods 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は高炉用送風の調湿に関し、この明細書で述べる
技術は、高炉送風を加湿するときの水吹込み量制御方法
について提案する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to humidity control of blast furnace air, and the technology described in this specification proposes a method for controlling the amount of water blown when humidifying blast furnace air.
（従来の技術〉
一般に高炉の操業では、炉内羽口レベルの温度を一定に
保つために送風の加湿を紬す、いわゆる１ｊ７Ｊ湿操業
を行っている。例えば、炉内の熱レベルが低下（上１）
ｔ、たときは、送風中の湿分を下げ（上げ）で炉熱の上
昇（低下）が達せられるように制御するのである。(Prior art) In general, blast furnace operations are carried out in a so-called 1J7J humidification operation in which blast air is humidified in order to keep the temperature at the tuyere level in the furnace constant.For example, when the heat level inside the furnace decreases ( Above 1)
At t, control is performed so that the furnace heat can be increased (decreased) by decreasing (increasing) the humidity in the air being blown.
従来の調湿操柴としては、特公昭３６−１８３０３号で
開示するような水蒸気の形態で吹込む方法、あるいは特
開昭６６−１１９７１２号、特開昭５７−１４３４１２
号、特開昭５７−８５９０９号として開示の水吹込み方
法があり、大体送風機によってａｍ炉へ供給する送風中
に対して水分子−添加することにより、熱風炉から高炉
へ供給する送風を加湿することで共通している。Conventional humidity control methods include the method of blowing in the form of steam as disclosed in Japanese Patent Publication No. 36-18303, or the method disclosed in Japanese Patent Publication No. 66-119712 and Japanese Patent Application Publication No. 57-143412.
There is a water injection method disclosed in JP-A No. 57-85909, which humidifies the air supplied from the hot stove to the blast furnace by adding water molecules to the air supplied to the AM furnace by a blower. They have something in common.
（発明が解決しようとする問題点）
一般に水熱気添加は種々の不都合があって最近では水添
加が主流である。しかし、この水を送風中に添加（吹込
む）する技術の場合、添加した水が冷風管内で蒸発せず
、熱風炉蓄熱室れんが積み部分にまで持込まれ、その結
果、れんがのスポーリング、粉化さらにはれんが材質の
変成等の問題点を惹起していた。(Problems to be Solved by the Invention) Generally, adding hot air to water has various disadvantages, and recently, adding water has become mainstream. However, in the case of technology that adds (blows in) this water while blowing air, the added water does not evaporate in the cold air pipe and is brought into the brickwork of the hot blast furnace heat storage chamber, resulting in brick spalling and powder. Furthermore, problems such as alteration of the brick material were caused.
水添加時に蒸気化しない理由としては、冷風温度と冷風
圧力で定まる沸点に大きく依存しており、たとえば２０
０〜ｓｏｏ’ｃの高温ガス体へ水を霧化すれば一瞬に蒸
気化することが明らかである。The reason why water does not evaporate when adding water is largely dependent on the boiling point determined by the cold air temperature and cold air pressure.
It is clear that if water is atomized into a high-temperature gas body of 0 to soo'c, it will instantly vaporize.
１例として鉄と鋼８４−３３７に冷風温度が２１０゛Ｃ
のときに１６ 、６ｇｌＮｍ＆吹込んだことが報告され
ている。しかし、高炉送風用の冷風温度は、常に２００
℃以上ある場合は少なく、通常２００〜１５０℃程度で
、送風圧力から定まる沸点は１５０℃ｆｆｔＪ後の状態
が多い。又、冷風温度が日々変動するものであり、冷風
温度に応じた管理が必要であるが、従来技術では、その
管理方法が不明であり、ドレンが生じたら水添加を減少
させるというトライアンードエラー法に頼ることが多か
った。これでは、上記熱風炉レンガ損傷等の問題を根本
的に解決したことにならｒｌい。As an example, the cold air temperature is 210°C for iron and steel 84-337.
It is reported that 16.6 glNm was injected at the time of the test. However, the temperature of the cold air for blast furnace ventilation is always 200.
There are few cases where the temperature is higher than 0.degree. C., and it is usually about 200 to 150.degree. C., and the boiling point determined from the blowing pressure is often after 150.degree. In addition, the temperature of cold air fluctuates daily, and it is necessary to manage it according to the temperature of the cold air. However, in the conventional technology, it is unclear how to manage this, and a trial-and-error method is used in which water addition is reduced when drainage occurs. They often relied on the law. This does not mean that the problems such as damage to the hot air stove bricks have been fundamentally solved.
このように従来の技術には、冷風温度が２００℃以下の
ときに冷風管への水添加時に気化が完了しないでドレン
を発生するという無視できない問題点を有するが、ｌに
ドレントラップを沢山設：して実際にドレンの発生をみ
てから作動させるという手段しかなく、ドレンの発生し
ないような条絆の水吹込み制御は実施されていないのが
実情である。As described above, the conventional technology has a non-negligible problem in that when water is added to the cold air pipe when the cold air temperature is below 200°C, vaporization is not completed and drain is generated. The only way to do this is to check for actual drainage before starting the operation, and the reality is that water injection control for row ties that prevents drainage has not been implemented.
（問題点を解決するための手段）
本発明者らは従来不明であったドレンの発生機Ｌ’Ｇに
ついて研究し、非常に小さい液滴球の熱伝達ｆ＋数が既
知のランッ晦マーシャルの式（Ｒａｎｇ ｂＭａｒｓｈ
ａｌｌ ） ＜機械学会用、伝熱工学資料Ｐ４３＞にも
とづく係数の０．０５〜０．１０％に相当することをつ
きとめ、これにより吹込前の冷風温度が２００℃以下で
もドレン化しない吹込み凋の限界を推定することが可能
になり、安全な冷風管水吹込みを可能にしたのである。(Means for Solving the Problems) The present inventors researched the condensate generator L'G, which was previously unknown, and used Runsho Marshall's equation for which the heat transfer f+ number of a very small droplet sphere was known. (Rang bMarsh
All) It was found that the coefficient corresponds to 0.05 to 0.10% of the coefficient based on <Heat Transfer Engineering Material P43 for the Japan Society of Mechanical Engineers>, and this shows that the blowing temperature does not turn into a drain even when the cold air temperature before blowing is 200℃ or less. This made it possible to estimate the limits of water flow, making it possible to safely inject water into cold air pipes.
すなわち、本発明は、送Ｘ機と熱風炉の間における送風
中に水を添加して搗炉送風を加湿するに当り吹込ｒＩＩ
」の冷ＦＭ、湿度カ２００”Ｃ以下（１）ｊａ＆ニ水吹
込ミｊｌｌ’ｆ （ｇ／Ｈｍ”）を、吹込み前冷風温度
（℃）との１１１１連のもとで、次式；
％式％
にもとづき制御することにつき、上記課題解決手段とし
てｍ案する。That is, the present invention provides a method for adding water to the air being blown between the X blower and the hot stove to humidify the air being blown from the hearth.
'' cold FM, humidity 200"C or less (1) ja & water blowing temperature (g/Hm") and pre-blowing cold air temperature (℃) under 1111 series, the following formula; Regarding control based on the % formula %, we propose m as a means to solve the above problem.
（作用）
第１図は上記式：Ｙ ＜ ”／８Ｘ −４８，８の根拠
を示す冷風温度（℃）と吹込み水分（ｇ／Ｎｍ）との関
係を示す図であり、以下にその算出の根拠を説明する。(Function) Figure 1 is a diagram showing the relationship between cold air temperature (℃) and blown moisture (g/Nm), which shows the basis of the above formula: Y <''/8X -48,8, and the calculation is shown below. Explain the basis of this.
冷風管１内の微小区間ＩＺＨの入側の冷風湿度Ｔ、 （
℃） 、ａｉ１′１度ＴＷ（℃）、液滴半径Ｒ（ｍ）、
ｌ１１：滴速度ｖ（ｍ／、）とし、微小空間Δ２内を単
位時間当り旬過する液ｆｔ ２ （ｋｉ数は不変でＮで
あるとした倶弐図を第２図で示す。The cold air humidity T on the inlet side of the minute section IZH in the cold air pipe 1, (
℃), ai1'1 degree TW (℃), droplet radius R (m),
FIG. 2 shows a diagram in which the droplet velocity is v (m/, ), and the liquid ft 2 (ki number remains constant and is N) passing through the minute space Δ2 per unit time.
冷風ｔａＢ Ｖ （Ｎｍ’／ ｈ ）、冷ＪｉｉＬｉ４
ｉ［Ｖ （”／ｈ）、吹込みｍＷ （ｋｇ／ｈ ）とし
、これらのパラメータを用いて、微小区間Δ２の前後で
の各バランスを求めると次の■〜■を導くことができる
。Cold air taB V (Nm'/h), cold JiiLi4
i[V (''/h) and the blowing mW (kg/h), and by using these parameters and finding each balance before and after the minute section Δ2, the following ① to ② can be derived.
（１１冷風の顕熱変化は、１］個の液滴表面が受ける受
熱量に等しいから次式■が成立する。(11) Since the sensible heat change of the cold air is equal to the amount of heat received by the surface of 1] droplets, the following equation (2) holds true.
ａｖｘｃｐｇｘΔＴ、−ＮＸ４ｇｕ”ｘＨｘ （Ｔｇ−
ＴＶ）ＸＴ’ 、、、■○ｐｇ：ガスの比熱
（２］ 液滴は顕熱変化ｆｉｌｌＫ度上昇）と潜熱変
化（蒸発）を受けるが、その顕熱変化における熱Ａラン
スは次のようになる。avxcpgxΔT, -NX4gu"xHx (Tg-
TV) Become.
Ｃｐ’ｘρ、ｘΔＴＷＸ÷ＰｃＲ’−４ｇＲ”ｘｈｘ（
Ｔｇ−ＴＶ）ｘ Ｖ −・・■ｃｐＷ 、水の比熱
ρＷ、；水の密度
α ；補正係数
ｈ：液層−・冷風間の全熱伝達係数■のうちの顕然変化
分の熱伝熱係数
ｈ −２１（０＜２＜１１
（８） 液滴の蒸発は、昇温過程で表面から蒸発が起
り、その潜熱は液滴が受けた受熱量から昇温に使用され
る熱量の残りであるから次式■が成立する。Cp'xρ, xΔTWX÷PcR'-4gR"xhx(
Tg-TV) Coefficient h -21 (0<2<11 (8) Evaporation of a droplet occurs from the surface during the temperature rising process, and the latent heat is the remainder of the heat used to raise the temperature from the amount of heat received by the droplet. Since there is, the following formula ■ holds true.
上π・３ルＲ”Ｘ４．ＸＬＸＮ−ＮＸ４ｒＲ”Ｘ（Ｔｇ
−ＴＶ）Ｘ’７”Ｘ（Ｈ−ｈ） ・・・■δ
Ｌ：蒸発潜熱
（４） 液滴はｖＪ連Ｖで吹込まれ、抵抗指数０．６
３を受けながら冷風速度Ｕに近づく。その運動方程式は
、
（÷πＲ８ｐＷ）Ｈ＝−０，６３”ｐｇＲ”ｔ （Ｖ−
Ｕ）シ２・・・■ρｇ：ガスの比熱
以上の０〜０式をまとめるさ
となり、次式■）が成立する。Upper π・3R"X4.XLXN-NX4rR"X(Tg
-TV)X'7"
3, the cold air speed approaches U. The equation of motion is (÷πR8pW)H=-0,63"pgR"t (V-
U) C2... ■ρg: This is a summary of the 0 to 0 equations that are greater than the specific heat of the gas, and the following equation (■) holds true.
λ：熱伝導率
１ ｖ；動粘性係数ここで、上、
尼Ｈがランフ・マーシャル式にもとづく熱伝達係数であ
る。λ: thermal conductivity 1 v; kinematic viscosity coefficient where, above,
H is the heat transfer coefficient based on the Rumph-Marshall equation.
ことにより、冷風管長手方向における液滴径の変化をシ
ミュレーションすることができる。By doing so, it is possible to simulate the change in droplet diameter in the longitudinal direction of the cold air pipe.
第３図には、補正係数αを変化させたときのシミュレー
ション結果を示す。これは水吹込みの位置から熱風炉ま
で約１００ｍの冷風管長さに対応させて、（１）式にも
とづく冷風温度、（Ｉ）式にもとすく液適温度、（Ｉ）
式にもとづく液滴径の変化を表わしたものであるが、液
滴径１０μを気化状態とした場合αが０．１０の場合を
例にとると、冷風管長さが１００ｍのところで１０Ｐ以
下の気化状態にあることがわかる。例えばαが０．０５
の場合は、配管長８５ｍのところで１０μ以下の気化状
態になる。FIG. 3 shows simulation results when the correction coefficient α is varied. This corresponds to the cold air pipe length of about 100 m from the water injection position to the hot air stove, and the cold air temperature is calculated based on equation (1), the optimum liquid temperature is calculated based on equation (I), and the temperature is calculated based on equation (I).
This shows the change in the droplet diameter based on the formula. For example, when α is 0.10 when the droplet diameter is 10μ and the droplet diameter is 10μ, the vaporization is less than 10P when the cold air pipe length is 100m. You can see that it is in a state. For example, α is 0.05
In this case, the vaporized state becomes less than 10μ at a pipe length of 85m.
上述した結果から望ましいαの範囲は０．０５〜０．１
０ということになる。From the above results, the desirable range of α is 0.05 to 0.1.
This means 0.
このαのｖｌに対応させて冷風温度が２００℃以下の冷
風温度と水吹込みｆ（ｋとの関係を示したのが第１図で
ある。これを実操業で確認したところ、若干の差はあっ
たものの実績値とシミュレーション結果とがよく一致し
ていることが確められた。Figure 1 shows the relationship between the cold air temperature and the water injection f(k) when the cold air temperature is below 200°C in correspondence to vl of α.When this was confirmed in actual operation, there was a slight difference. Although there were some differences, it was confirmed that the actual values and simulation results were in good agreement.
要するに、冷風温度が２００℃以下においてドレン化を
起さない水吹込みの安全領域が、図よりｙぐ／、χ−４
８，３
ｙ：水吹込みｍ （ｇ／Ｎｍ ）
Ｘ：冷風温度（℃）
である。In short, the safe area for water injection that does not cause drainage when the cold air temperature is below 200℃ is yg/, χ-4.
8,3 y: Water injection m (g/Nm) X: Cold air temperature (°C).
（実施例）
冷風管の配管径：１０００ｗφ、吹込み位看から熱風炉
入口までの配管是：ｌＱＱｍ、の設備を用い、水吹込み
量をノズル本数で制υνするｒ９Ｒ制闘を行った例につ
いて述べる。(Example) An example of performing r9R control in which the amount of water blown in is controlled by the number of nozzles, using equipment with a cold air pipe diameter of 1000wφ and a piping ratio from the blowing point to the hot blast furnace inlet: 1QQm. Let's talk about.
ノズル１本当りのノズルの吹込み量：０．４／ｈ１圧力
’ ４．５１ ｋｄｒｌ、送風Ｑ ： ４０００ Ｎｍ
’／、、、ｎ。Nozzle blowing amount per nozzle: 0.4/h1 pressure' 4.51 kdrl, air blowing Q: 4000 Nm
'/,,,n.
冷に温度：１９５℃″′Ｃ操業する場合について見ると
、第５図かられかるように、安全吹込み限界量は１６．
７ ｇ／Ｎｒｎ３（１０本） ＴＪル。ｔ タｚ 送Ｘ
Ｑが３°” ” ／ｍｉｎ ％ １２７ Ｘ 温ｕ
カ１８０℃のときの同吹込み限界ｆｒ１１１．７Ｕ′Ｎ
ｍ’ ニなる。ＣＭ （１１，７）＝”／ａ ｘ（１８
０）−４８，３〕（発
明の効果）
以上ＨＱ ＋９Ｊ したように本発明によれは、冷風温
度が低い状態でも、送風中の水分を熱風炉に送り込む前
に完全に気化させることができるからドレンの発生がな
く、従って熱風炉蓄熱室のれんがを損傷させて寿命を短
縮するようなことがなく、モしてドレンの発生がないの
でドレントラップ等の諸設備配設が軽減される。If we look at the case of cold operation at 195°C'''C, as can be seen from Figure 5, the safe limit amount of injection is 16.
7 g/Nrn3 (10 bottles) TJ Le. t t z send
Q is 3°” ” /min % 127
The same blowing limit fr111.7U'N at 180℃
m' ni naru. CM (11,7)=”/a x(18
0) -48,3] (Effect of the invention) As mentioned above, according to the present invention, even when the temperature of the cold air is low, the moisture in the air can be completely vaporized before being sent to the hot air stove. No condensate is generated, so there is no damage to the bricks of the hot air stove heat storage chamber and shortening of its life.Furthermore, since no condensate is generated, the installation of various equipment such as a drain trap can be reduced.
李９図面のｊｌむ単な説明
第１図は、冷風温度と水吹込み丘（との関係を示すグラ
フ、
第２図は、ドレンの発生１１！ｌｌ構を説明するための
シミュレーションモデルの概念図、
第８図は、ランフ・マーシャルの熱伝達係数の補正係数
Ｉａ）の限定を明らかにするグラフ、第４図は、吹込み
抛業列について示す操某グラフである。Figure 1 is a graph showing the relationship between cold air temperature and water injection hill. Figure 2 is a concept of a simulation model to explain the condensate generation structure. Figure 8 is a graph clarifying the limitations of the correction coefficient Ia) of the Lampf-Marshall heat transfer coefficient, and Figure 4 is a certain graph showing the blowing operation sequence.
１・・・冷風管 ２・・・数滴。1... Cold air pipe 2... Several drops.
同 弁理士 杉 村 興 第１図 第２図Same patent attorney Oki Sugi Mura Figure 1 Figure 2
Claims (1)
ける送風に対し水を添加する方法において、吹込み前の
冷風温度が２００℃以下の場合にその添加に当り水吹込
み量ｙ（ｇ／Ｎｍ＾３）を、吹込み前冷風温度（℃）と
の関連のもとで、次式； ｙ≦１／８ｘ−４８．８ にもとづき制御することを特徴とする高炉調湿送風にお
ける水吹込み量制御方法。[Scope of Claims] 1. In a method of adding water to air blown between a blower and a hot blast furnace in order to humidify the air blown into a blast furnace, when the temperature of cold air before blowing is 200°C or less, water is added. The water injection amount y (g/Nm^3) is controlled based on the following equation; y≦1/8x-48.8 in relation to the pre-injection cold air temperature (°C). A method for controlling the amount of water injected in blast furnace humidity-controlled air blowing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59164220A JPS6144112A (en) | 1984-08-07 | 1984-08-07 | Method for controlling water blowing rate in blasting for humidification of blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59164220A JPS6144112A (en) | 1984-08-07 | 1984-08-07 | Method for controlling water blowing rate in blasting for humidification of blast furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6144112A true JPS6144112A (en) | 1986-03-03 |
Family
ID=15788950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59164220A Pending JPS6144112A (en) | 1984-08-07 | 1984-08-07 | Method for controlling water blowing rate in blasting for humidification of blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6144112A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55115958U (en) * | 1979-02-09 | 1980-08-15 | ||
| JPS57194938A (en) * | 1981-05-13 | 1982-11-30 | Crown Cork Japan | Vessel having vessel cover fly preventive characteristic and combination of vessel and vessel cover |
-
1984
- 1984-08-07 JP JP59164220A patent/JPS6144112A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55115958U (en) * | 1979-02-09 | 1980-08-15 | ||
| JPS57194938A (en) * | 1981-05-13 | 1982-11-30 | Crown Cork Japan | Vessel having vessel cover fly preventive characteristic and combination of vessel and vessel cover |
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