JP6604344B2 - Preheating gas blowing device to blast furnace shaft, preheating gas blowing method and blast furnace operating method - Google Patents
Preheating gas blowing device to blast furnace shaft, preheating gas blowing method and blast furnace operating method Download PDFInfo
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- 238000007664 blowing Methods 0.000 title claims description 87
- 238000000034 method Methods 0.000 title claims description 28
- 238000011017 operating method Methods 0.000 title claims description 8
- 239000007789 gas Substances 0.000 claims description 420
- 238000002485 combustion reaction Methods 0.000 claims description 53
- 238000010790 dilution Methods 0.000 claims description 48
- 239000012895 dilution Substances 0.000 claims description 48
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 34
- 239000001301 oxygen Substances 0.000 claims description 31
- 229910052760 oxygen Inorganic materials 0.000 claims description 31
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 30
- 229910052757 nitrogen Inorganic materials 0.000 claims description 17
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 239000000428 dust Substances 0.000 description 18
- 239000000203 mixture Substances 0.000 description 14
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 11
- 239000000571 coke Substances 0.000 description 8
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 235000013980 iron oxide Nutrition 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- -1 ore Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000003085 diluting agent Substances 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000010405 reoxidation reaction Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 150000003752 zinc compounds Chemical class 0.000 description 1
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- Manufacture Of Iron (AREA)
- Blast Furnaces (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Description
本発明は、安定した低還元材比操業を実施するための高炉シャフト部への予熱ガス吹込み装置、予熱ガス吹込み方法および高炉操業方法に関する。 The present invention relates to a preheating gas blowing device, a preheating gas blowing method, and a blast furnace operating method for a blast furnace shaft portion for performing stable low reducing material ratio operation.
近年、ＣＯ２排出量の増加による地球温暖化が問題となっており、製鉄業においてもＣＯ２排出量の抑制は重要な課題である。これを受け、最近の高炉操業では低還元材比（低ＲＡＲ）操業が推進されている。しかしながら、ＲＡＲ（Ｒｅｄｕｃｔｉｏｎ Ａｇｅｎｔ Ｒａｔｉｏ：銑鉄１ｔ製造当たりの、吹込み燃料と炉頂から装入されるコークスの合計量）を低下させることは吹込み燃料やコークスの燃焼量を低減することであるので、原理的に羽口からの送風量を低減させることになる。この結果、炉内ガス量は減少し、また炉内ガスの有する熱量も減少する。 In recent years, global warming due to an increase in CO 2 emissions has become a problem, and suppression of CO 2 emissions is also an important issue in the steel industry. In response, recent blast furnace operations are promoting low-reducing material ratio (low RAR) operations. However, reducing the RAR (Reduction Agent Ratio: the total amount of injected fuel and coke charged from the top of the furnace per 1 ton of pig iron) is to reduce the amount of injected fuel and coke combustion. In principle, the amount of air blown from the tuyere will be reduced. As a result, the amount of gas in the furnace is reduced, and the amount of heat of the gas in the furnace is also reduced.
高炉へ装入される装入物は、高炉内を上昇する炉内ガスにより昇温されるが、炉内ガスの有する熱量が減少するとシャフト上部においては装入物の昇温が遅れ、順調な還元が達成されなくなるおそれがある。加えて、特にシャフト上部で温度低下が生じると、シャフト上部の内壁に炉内ガスに含まれる亜鉛化合物などが付着する、いわゆる壁付きが助長され、これが炉内ガスの流れを阻害して、高炉内の風圧変動や、高炉内の装入物の降下異常などの炉況不調を招く。また、炉上部の温度が低下して１００℃を下回るような場合には、炉頂ガス中の水分が炉頂ガス配管内に結露し、配管内壁の耐火物の劣化や配管腐食といった問題が生じることもある。 The charge charged to the blast furnace is heated by the furnace gas rising in the blast furnace, but if the amount of heat of the furnace gas decreases, the temperature rise of the charge is delayed at the upper part of the shaft, and smooth. Reduction may not be achieved. In addition, when a temperature drop occurs especially at the upper part of the shaft, zinc compounds contained in the furnace gas adhere to the inner wall of the upper part of the shaft, which promotes the so-called wall attachment, which hinders the flow of the gas in the furnace, It causes instability of the furnace such as fluctuation of the wind pressure in the inside and abnormal drop of the charge in the blast furnace. Further, when the temperature at the top of the furnace is lowered to below 100 ° C., moisture in the furnace top gas is condensed in the furnace top gas pipe, causing problems such as deterioration of the refractory on the pipe inner wall and pipe corrosion. Sometimes.
特許文献１には、普通高炉において低ＲＡＲ操業を行った場合にシャフト上部での装入物の昇温が遅れるという課題を解決するために、シャフト部に設けられたガス吹込み部から予熱ガスを吹込む方法が開示されている。 In Patent Document 1, in order to solve the problem that the temperature rise of the charge in the upper part of the shaft is delayed when a low RAR operation is performed in an ordinary blast furnace, a preheating gas is supplied from a gas blowing part provided in the shaft part. A method of blowing is disclosed.
一方、上記した通常の普通高炉とは異なるタイプの高炉として、羽口から常温の純酸素を高炉内に吹込むことにより溶銑を製造する酸素高炉がある（特許文献２参照）。この酸素高炉は、実質的に窒素を含まない高炉ガスを発生させ、これを回収して合成化学工業用ガスとして使用する点に特徴がある。このような酸素高炉では、実質的に窒素を含まない炉内ガスにより装入物の昇温還元を行うが、普通高炉以上に炉内ガス量が少ないので、さらにシャフト上部の装入物の昇温が遅れ、順調な還元が達成されなくなるおそれがある。特許文献３には、このような酸素高炉のシャフト部から吹込むガスとして、酸素高炉の炉頂から発生する高炉ガスを昇圧し、純酸素を用いて燃焼させた予熱ガスを使用することが開示されている。 On the other hand, there is an oxygen blast furnace that produces hot metal by injecting pure oxygen at room temperature into a blast furnace from a tuyere as a type of blast furnace different from the above-described ordinary ordinary blast furnace (see Patent Document 2). This oxygen blast furnace is characterized in that a blast furnace gas containing substantially no nitrogen is generated and recovered and used as a gas for the synthetic chemical industry. In such an oxygen blast furnace, the temperature of the charge is reduced by a furnace gas that does not substantially contain nitrogen, but the amount of gas in the furnace is smaller than that of a normal blast furnace. The temperature is delayed, and there is a risk that smooth reduction cannot be achieved. Patent Document 3 discloses that a preheated gas that is pressurized from blast furnace gas generated from the top of the oxygen blast furnace and burned with pure oxygen is used as the gas blown from the shaft portion of the oxygen blast furnace. Has been.
シャフト部へ吹込むガスの成分、温度、圧力は厳密に制御する必要がある。しかしながら、特許文献１および特許文献３に開示されているように高炉ガスの一部を取り出し、燃焼炉で燃焼させると、予熱ガスの温度はシャフト部から吹込むガスの目標温度より高くなりすぎる傾向があり、燃焼炉における燃焼の制御では予熱ガスの温度のばらつきが大きく、予熱ガスの温度を適切に調整するのが困難である、という課題があった。 It is necessary to strictly control the composition, temperature, and pressure of the gas blown into the shaft portion. However, when a part of the blast furnace gas is taken out and burned in the combustion furnace as disclosed in Patent Document 1 and Patent Document 3, the temperature of the preheated gas tends to be higher than the target temperature of the gas blown from the shaft portion. In the combustion control in the combustion furnace, there is a problem that the temperature of the preheating gas varies greatly, and it is difficult to appropriately adjust the temperature of the preheating gas.
このような課題を解決する本発明の特徴は、以下の通りである。
（１）高炉ガスを昇圧する昇圧機と、昇圧された高炉ガスを燃焼して予熱ガスを生成する燃焼炉と、前記燃焼炉で生成された予熱ガスを貯蔵する貯蔵室と、前記貯蔵室に希釈ガスを供給する希釈ガス流路と、高炉シャフト部を囲むように設けられた環状管であるレシーバータンクと、を有し、前記レシーバータンクは、前記貯蔵室と、高炉シャフト部の円周方向に設置された複数のガス吹込みノズルとに接続されている、高炉シャフト部への予熱ガス吹込み装置。
（２）前記貯蔵室には、少なくとも前記予熱ガスの温度を測定するセンサが設けられ、前記貯蔵室と前記レシーバータンクとの間には遮断弁が設けられている、（１）に記載の高炉シャフト部への予熱ガス吹込み装置。
（３）高炉ガスを回収し、前記高炉ガスを昇圧して高圧ガスを生成し、前記高圧ガスを燃焼して予熱ガスを生成し、前記予熱ガスを貯蔵室に貯蔵し、前記貯蔵室に貯蔵された予熱ガスを、高炉シャフト部を囲むように設けられた環状管を通じて高炉シャフト部の円周方向から高炉内に吹込む予熱ガスの吹込み方法であって、
前記貯蔵室に希釈ガスを導入することで、前記貯蔵室に貯蔵された前記予熱ガスの温度を調整する、予熱ガス吹込み方法。
（４）前記貯蔵室と前記環状管の間に遮断弁が設けられ、前記予熱ガスの温度が調整された後に、前記遮断弁を開いて前記予熱ガスを前記高炉内に吹込む、（３）に記載の予熱ガス吹込み方法。
（５）前記希釈ガスは、前記高圧ガスである、（３）または（４）に記載の予熱ガス吹込み方法。
（６）前記希釈ガスは、窒素である、（３）から（５）のいずれか１つに記載の予熱ガス吹込み方法。
（７）高炉炉下部の羽口から酸素を吹込む高炉操業方法であって、（３）から（５）のいずれか１つに記載の予熱ガス吹込み方法で、高炉シャフト部の円周方向から高炉内に予熱ガスを吹込む、高炉操業方法。
（８）高炉炉下部の羽口から空気または酸素富化空気を吹込む高炉操業方法であって、（３）から（６）のいずれか１つに記載の予熱ガス吹込み方法で、高炉シャフト部の円周方向から高炉内に予熱ガスを吹込む、高炉操業方法。
The features of the present invention that solve such problems are as follows.
(1) A booster that boosts the blast furnace gas, a combustion furnace that burns the boosted blast furnace gas to generate a preheating gas, a storage chamber that stores the preheating gas generated in the combustion furnace, and a storage chamber A dilution gas flow path for supplying a dilution gas; and a receiver tank that is an annular pipe provided so as to surround the blast furnace shaft portion; and the receiver tank includes the storage chamber and a circumferential direction of the blast furnace shaft portion. A preheating gas blowing device connected to a plurality of gas blowing nozzles installed in the blast furnace shaft portion.
(2) The blast furnace according to (1), wherein the storage chamber is provided with at least a sensor for measuring the temperature of the preheating gas, and a shutoff valve is provided between the storage chamber and the receiver tank. Preheating gas blowing device to the shaft.
(3) Collect blast furnace gas, pressurize the blast furnace gas to generate high pressure gas, burn the high pressure gas to generate preheated gas, store the preheated gas in a storage room, and store in the storage room The preheating gas is blown into the blast furnace from the circumferential direction of the blast furnace shaft portion through an annular pipe provided so as to surround the blast furnace shaft portion,
A preheating gas blowing method of adjusting a temperature of the preheating gas stored in the storage chamber by introducing a dilution gas into the storage chamber.
(4) A shutoff valve is provided between the storage chamber and the annular pipe, and after the temperature of the preheated gas is adjusted, the shutoff valve is opened and the preheated gas is blown into the blast furnace. (3) The preheating gas blowing method described in 1.
(5) The preheating gas blowing method according to (3) or (4), wherein the dilution gas is the high-pressure gas.
(6) The preheating gas blowing method according to any one of (3) to (5), wherein the dilution gas is nitrogen.
(7) A blast furnace operating method in which oxygen is blown from the tuyeres at the bottom of the blast furnace, wherein the preheating gas blowing method according to any one of (3) to (5) A blast furnace operation method in which preheating gas is blown into the blast furnace.
(8) A blast furnace operating method for blowing air or oxygen-enriched air from a tuyeres at the bottom of the blast furnace, wherein the preheated gas blowing method according to any one of (3) to (6) A blast furnace operation method in which preheating gas is blown into the blast furnace from the circumferential direction of the section.
本発明に係る予熱ガス吹込み方法の実施により、温度が適切に調整された予熱ガスを高炉シャフト部から吹込むことができる。これにより、炉況不良を回避でき、通常高炉および酸素高炉の安定操業に寄与できる。 By carrying out the preheating gas blowing method according to the present invention, the preheating gas whose temperature is appropriately adjusted can be blown from the blast furnace shaft portion. Thereby, a poor furnace condition can be avoided and it can contribute to the stable operation of a normal blast furnace and an oxygen blast furnace.
以下、本発明に係る高炉シャフト部への予熱ガス吹込み装置を高炉炉下部の羽口から空気または酸素富化空気を吹込むことで溶銑を製造する通常高炉に適用させた実施形態で説明する。図１は、高炉１０と、本実施形態に係る予熱ガス吹込み装置３０を示す断面模式図である。図１に示すように、高炉１０の炉下部には複数の羽口１４が設けられ、複数の羽口１４から補助還元材１６と熱風１７とが高炉内に吹込まれて高炉操業が実施される。 Hereinafter, an embodiment in which a preheating gas blowing device for a blast furnace shaft according to the present invention is applied to a normal blast furnace for producing hot metal by blowing air or oxygen-enriched air from a tuyere at the lower part of the blast furnace will be described. . FIG. 1 is a schematic cross-sectional view showing a blast furnace 10 and a preheating gas blowing device 30 according to the present embodiment. As shown in FIG. 1, a plurality of tuyere 14 are provided at the bottom of the blast furnace 10, and auxiliary reducing material 16 and hot air 17 are blown into the blast furnace from the plurality of tuyere 14 to perform blast furnace operation. .
高炉１０の炉頂部から排出される高炉ガスＧ０は、ダストキャッチャー２２で粗粒ダストが除去され、湿式除塵機２４で細粒ダストが除去され、炉頂ガス発電装置２６で高炉ガスＧ０の圧力が電気として回収された後に系外２８へ排出される。 The blast furnace gas G 0 discharged from the top of the blast furnace 10 has coarse dust removed by the dust catcher 22, fine dust removed by the wet dust remover 24, and the blast furnace gas G 0 is removed by the furnace gas generator 26. After the pressure is recovered as electricity, it is discharged out of the system 28.
高炉１０には８つのガス吹込みノズル１９が設けられている。８つのガス吹込みノズル１９は、シャフト部１８の炉周方向に等間隔となるように設けられている。ガス吹込みノズル１９には、遮断弁が設けられておらず、開放された状態になっている。何れかのガス吹込みノズル１９の近傍には、高炉１０の炉内圧力および炉内温度を測定するセンサ２０が設けられている。さらに、高炉１０の炉頂にも炉頂圧力および炉頂温度を測定するセンサ２１が設けられている。 The blast furnace 10 is provided with eight gas blowing nozzles 19. The eight gas blowing nozzles 19 are provided at equal intervals in the furnace circumferential direction of the shaft portion 18. The gas blowing nozzle 19 is not provided with a shut-off valve and is open. A sensor 20 that measures the in-furnace pressure and the in-furnace temperature of the blast furnace 10 is provided in the vicinity of any of the gas blowing nozzles 19. Furthermore, a sensor 21 for measuring the furnace top pressure and the furnace top temperature is also provided at the furnace top of the blast furnace 10.
本実施形態に係る予熱ガス吹込み装置３０は、昇圧機３２と、燃焼炉３４と、貯蔵室３５と、レシーバータンク３８と、遮断弁３６とを有する。昇圧機３２は、高炉ガスＧ０を昇圧して高圧ガスを生成する。燃焼炉３４は、高圧ガスを燃焼して、予熱ガスを生成する。貯蔵室３５は、予熱ガスを貯蔵する。レシーバータンク３８は、シャフト部１８を囲むように設けられた環状管であって、貯蔵室３５と、高炉シャフト部の円周方向に設置された複数のガス吹込みノズル１９とを接続している。遮断弁３６は、弁を遮断状態と開放状態とに切り替えることができ、開放状態では貯蔵室３５からレシーバータンク３８への予熱ガスの搬送を許容し、遮断状態では貯蔵室３５からレシーバータンク３８への予熱ガスの搬送を停止する。 The preheated gas blowing device 30 according to the present embodiment includes a booster 32, a combustion furnace 34, a storage chamber 35, a receiver tank 38, and a shutoff valve 36. Booster 32 generates a high-pressure gas boosts the blast furnace gas G 0. The combustion furnace 34 burns high-pressure gas and generates preheated gas. The storage chamber 35 stores preheated gas. The receiver tank 38 is an annular tube provided so as to surround the shaft portion 18, and connects the storage chamber 35 and a plurality of gas blowing nozzles 19 installed in the circumferential direction of the blast furnace shaft portion. . The shut-off valve 36 can switch the valve between a shut-off state and an open state, and allows the preheated gas to be transferred from the storage chamber 35 to the receiver tank 38 in the open state, and from the storage chamber 35 to the receiver tank 38 in the shut-off state. Stop the preheating gas transport.
さらに、予熱ガス吹込み装置３０は、回収流路４０と、高圧ガス流路４２、４３と、予熱ガス流路４４、４５と、センサ５０、５２とを有する。回収流路４０は、高炉ガスＧ０の一部を回収する流路であって、高炉１０の炉頂部とダストキャッチャー２２とを接続する流路から分岐された流路である。高圧ガス流路４２は、昇圧機３２と燃焼炉３４とを接続する流路である。高圧ガス流路４３は、昇圧機３２と貯蔵室３５とを接続する流路である。予熱ガス流路４４は、燃焼炉３４と貯蔵室３５とを接続する流路である。予熱ガス流路４５は、貯蔵室３５とレシーバータンク３８とを接続する流路である。センサ５０は、回収流路４０に設けられ、高炉ガスＧ０の組成、ダスト濃度、温度、圧力を測定する。また、センサ５２は、貯蔵室３５に設けられ、少なくとも予熱ガスの温度を測定する。 Further, the preheating gas blowing device 30 includes a recovery channel 40, high-pressure gas channels 42 and 43, preheating gas channels 44 and 45, and sensors 50 and 52. The recovery flow path 40 is a flow path for recovering a part of the blast furnace gas G 0 , and is a flow path branched from a flow path connecting the top of the blast furnace 10 and the dust catcher 22. The high-pressure gas channel 42 is a channel that connects the booster 32 and the combustion furnace 34. The high-pressure gas channel 43 is a channel that connects the booster 32 and the storage chamber 35. The preheating gas channel 44 is a channel that connects the combustion furnace 34 and the storage chamber 35. The preheating gas channel 45 is a channel that connects the storage chamber 35 and the receiver tank 38. Sensor 50 is provided in the recovery flow path 40, to measure the composition of the blast furnace gas G 0, dust concentration, temperature, pressure. The sensor 52 is provided in the storage chamber 35 and measures at least the temperature of the preheating gas.
予熱ガス吹込み装置３０では、まず、ダストキャッチャー２２に導入される前の高炉ガスＧ０の一部が回収され、回収流路４０を通じて、昇圧機３２に搬送される。昇圧機３２では、高炉ガスＧ０が高炉の炉内圧力以上に昇圧されて高圧ガスが生成される。高圧ガスは、高圧ガス流路４２を通じて燃焼炉３４に搬送される。燃焼炉３４では、高圧ガスに支燃ガス４６が導入されて、高炉ガスＧ０中にダストの一部として含まれる炭素が燃焼されて予熱ガスが生成される。 In the preheating gas blowing device 30, first, a part of the blast furnace gas G 0 before being introduced into the dust catcher 22 is recovered and conveyed to the booster 32 through the recovery flow path 40. In booster 32, blast furnace gas G 0 is a high-pressure gas is generated is boosted above the furnace pressure of the blast furnace. The high pressure gas is conveyed to the combustion furnace 34 through the high pressure gas flow path 42. In the combustion furnace 34, it introduces the oxidizing gas 46 to the high pressure gas, the preheating gas is produced carbon contained as part of the dust in blast furnace gas G 0 is burned.
燃焼炉３４では、高炉内に吹込む予熱ガスとして好ましい温度以上の予熱ガスを生成する。このように、本実施形態では、予熱ガスとして好ましい温度の範囲内になるように燃焼を制御するのではなく、好ましい温度以上になるように燃焼を制御する。予熱ガスの温度を好ましい温度以上になるようにする燃焼の制御は、好ましい温度の範囲内にする燃焼の制御よりも簡易であり、燃焼炉３４において厳密に燃焼の制御をしなくてよい。燃焼炉３４で生成された予熱ガスは、予熱ガス流路４４を通じて貯蔵室３５に搬送される。 In the combustion furnace 34, a preheating gas having a temperature higher than a preferable temperature as the preheating gas to be blown into the blast furnace is generated. Thus, in this embodiment, combustion is not controlled so that it may become in the range of preferable temperature as preheating gas, but combustion is controlled so that it may become more than preferable temperature. Combustion control for setting the temperature of the preheated gas to be equal to or higher than a preferable temperature is simpler than control for combustion within the preferable temperature range, and it is not necessary to strictly control the combustion in the combustion furnace 34. The preheated gas generated in the combustion furnace 34 is conveyed to the storage chamber 35 through the preheated gas passage 44.
センサ５２は、貯蔵室３５に貯蔵されている予熱ガスの温度を測定する。センサ５２で測定された予熱ガスの温度が、高炉内に吹込む予熱ガスとして好ましい温度の範囲を超えている場合、高炉内に吹込む予熱ガスとして好ましい温度の範囲内になるように、高圧ガス流路４３を通じて貯蔵室３５に高圧ガスが導入される。これにより、貯蔵室３５内の予熱ガスの温度が調整される。貯蔵室３５に導入される高圧ガスおよび予熱ガスの混合割合は、センサ５２によって測定される貯蔵室３５の予熱ガス温度と、センサ５０によって測定される高炉ガスの温度とに基づいて決定される。貯蔵室３５に高圧ガスを導入することによる予熱ガスの温度の調整は、高圧ガスおよび予熱ガスの混合割合を調整することで行えるので、燃焼炉３４における燃焼を制御することによる温度の調整よりも容易であって高い精度で予熱ガスの温度を調整できる。貯蔵室３５の容量は、１０秒程度の吹込みができる容量とすることが好ましい。レシーバータンク３５の容量が小さすぎると、燃焼炉３４で生成した予熱ガスの圧力や組成の均一性が悪くなるので好ましくない。また、貯蔵室３５の容量が大きすぎると、設備費が高くなり、経済合理性の観点からは好ましくない。なお、本実施形態における高圧ガスは希釈ガスの一例であり、高炉ガス流路４３は希釈ガス流路の一例である。 The sensor 52 measures the temperature of the preheated gas stored in the storage chamber 35. When the temperature of the preheating gas measured by the sensor 52 exceeds the temperature range preferable as the preheating gas to be blown into the blast furnace, the high pressure gas is set so as to be within the temperature range preferable as the preheating gas to be blown into the blast furnace. High-pressure gas is introduced into the storage chamber 35 through the flow path 43. Thereby, the temperature of the preheating gas in the storage chamber 35 is adjusted. The mixing ratio of the high-pressure gas and the preheating gas introduced into the storage chamber 35 is determined based on the preheating gas temperature of the storage chamber 35 measured by the sensor 52 and the temperature of the blast furnace gas measured by the sensor 50. The adjustment of the temperature of the preheating gas by introducing the high pressure gas into the storage chamber 35 can be performed by adjusting the mixing ratio of the high pressure gas and the preheating gas, so that the temperature adjustment by controlling the combustion in the combustion furnace 34 is performed. It is easy and the temperature of the preheating gas can be adjusted with high accuracy. The capacity of the storage chamber 35 is preferably set to a capacity capable of blowing for about 10 seconds. If the capacity of the receiver tank 35 is too small, the uniformity of the pressure and composition of the preheated gas generated in the combustion furnace 34 is not preferable. Moreover, when the capacity | capacitance of the storage chamber 35 is too large, an installation cost will become high and it is unpreferable from a viewpoint of economic rationality. In addition, the high pressure gas in this embodiment is an example of a dilution gas, and the blast furnace gas flow path 43 is an example of a dilution gas flow path.
また、センサ５２で測定された予熱ガスの温度が、高炉内に吹込む予熱ガスとして好ましい範囲を超えている場合、高炉内に吹込む予熱ガスとして好ましい温度の範囲内になるように、高圧ガスの導入に代え、または、高圧ガスの導入とともに、貯蔵室３５内に窒素４７を導入して予熱ガスの温度を調整してもよい。製鉄所内には窒素の供給配管が設置されているので、窒素４７を導入することによっても、容易であって高い精度で予熱ガスの温度を調整できる。なお、窒素４７は、希釈ガスの他の例であり、窒素を導入するために用いる窒素の供給配管と接続する流路は、希釈ガス流路の他の例である。 Further, when the temperature of the preheating gas measured by the sensor 52 exceeds a preferable range as the preheating gas to be blown into the blast furnace, the high pressure gas is set so as to be within a preferable temperature range as the preheating gas to be blown into the blast furnace. Alternatively, or together with the introduction of high-pressure gas, nitrogen 47 may be introduced into the storage chamber 35 to adjust the temperature of the preheating gas. Since a nitrogen supply pipe is installed in the steelworks, the temperature of the preheating gas can be adjusted easily and with high accuracy by introducing nitrogen 47. Nitrogen 47 is another example of the dilution gas, and the flow path connected to the nitrogen supply pipe used for introducing nitrogen is another example of the dilution gas flow path.
また、センサ５２は、貯蔵室３５に貯蔵される予熱ガスの温度とともに圧力および／または組成を測定してもよい。予熱ガスの圧力および組成が予熱ガスとして好ましい範囲内でない場合に、貯蔵室３５に高圧ガスおよび／または窒素４７を導入したり、一部の予熱ガスを不図示の流路を通じて系外２８へ放散させることで、貯蔵室３５の予熱ガスの圧力および組成を調整してもよい。 The sensor 52 may measure the pressure and / or composition together with the temperature of the preheated gas stored in the storage chamber 35. When the pressure and composition of the preheating gas are not within the preferred range for the preheating gas, a high pressure gas and / or nitrogen 47 is introduced into the storage chamber 35, or a part of the preheating gas is dissipated outside the system 28 through a flow path (not shown). By doing so, the pressure and composition of the preheating gas in the storage chamber 35 may be adjusted.
センサ５２によって測定される予熱ガスの温度、圧力および組成が予熱ガスとして好ましい範囲内の場合には、遮断弁３６の弁が開放状態となり、予熱ガスは、貯蔵室３５からレシーバータンク３８へ搬送される。一方、センサ５２によって測定される予熱ガスの温度、圧力および組成の少なくとも１つが予熱ガスとして好ましい範囲内でない場合には、遮断弁３６の弁が遮断状態となり、予熱ガスの温度、圧力および組成が調整される。なお、予熱ガスの温度、圧力および組成の調整が困難な場合には、不図示の流路を通じて予熱ガスを系外２８へ放散させてもよい。本実施形態において、センサ５０およびセンサ５２は、例えば、温度を測定する温度センサ、圧力を測定する圧力センサおよび組成を測定する赤外線ガス分析センサを含むセンサである。 When the temperature, pressure and composition of the preheating gas measured by the sensor 52 are within the preferable ranges for the preheating gas, the shutoff valve 36 is opened, and the preheating gas is transferred from the storage chamber 35 to the receiver tank 38. The On the other hand, when at least one of the temperature, pressure and composition of the preheating gas measured by the sensor 52 is not within the preferable range as the preheating gas, the shutoff valve 36 is shut off and the temperature, pressure and composition of the preheating gas are changed. Adjusted. If it is difficult to adjust the temperature, pressure and composition of the preheating gas, the preheating gas may be diffused to the outside of the system 28 through a flow path (not shown). In the present embodiment, the sensor 50 and the sensor 52 are sensors including, for example, a temperature sensor that measures temperature, a pressure sensor that measures pressure, and an infrared gas analysis sensor that measures composition.
レシーバータンク３８は、高炉シャフト部１８の周囲を囲むように設けられた環状管であって、８つガス吹込みノズル１９のそれぞれに接続されている。レシーバータンク３８では、搬送された予熱ガスを貯留するとともに、当該レシーバータンク３８を通じて、８つのガス吹込みノズル１９から予熱ガスの吹込みが行われる。本実施形態において、レシーバータンク３８は、予熱ガスのリザーバーとして機能するのに十分な容量を有している。このようなレシーバータンク３８を用いることで、予熱ガスの圧力や組成の均一性を高めることができる。また、燃焼炉３４が高炉１０から離れた位置に設置されたとしても、レシーバータンク３８を通じて、均一な流量で８つのガス吹込みノズルから予熱ガスを高炉内に吹込むことができる。なお、レシーバータンク３８の容量は、３〜１５秒程度の吹込みができる容量とすることが好ましい。レシーバータンク３８の容量が小さすぎると、燃焼炉３４で生成した予熱ガスの圧力や組成の均一性が悪くなるので好ましくない。また、レシーバータンク３８の容量が大きすぎると、高炉でのトラブル時に遮断弁３６が動作した後も、予熱ガスが高炉内に入り続けることになるので好ましくない。 The receiver tank 38 is an annular pipe provided so as to surround the periphery of the blast furnace shaft portion 18, and is connected to each of the eight gas blowing nozzles 19. In the receiver tank 38, the transported preheating gas is stored, and preheating gas is blown from the eight gas blowing nozzles 19 through the receiver tank 38. In the present embodiment, the receiver tank 38 has a sufficient capacity to function as a reservoir of preheated gas. By using such a receiver tank 38, the pressure and composition uniformity of the preheating gas can be increased. Even if the combustion furnace 34 is installed at a position away from the blast furnace 10, the preheated gas can be injected into the blast furnace through the receiver tank 38 from the eight gas injection nozzles at a uniform flow rate. In addition, it is preferable that the capacity | capacitance of the receiver tank 38 is a capacity | capacitance which can be blown in about 3 to 15 seconds. If the capacity of the receiver tank 38 is too small, the pressure and composition uniformity of the preheated gas generated in the combustion furnace 34 deteriorates, which is not preferable. Further, if the capacity of the receiver tank 38 is too large, it is not preferable because the preheating gas continues to enter the blast furnace even after the shut-off valve 36 is operated in case of trouble in the blast furnace.
また、レシーバータンク３８は、高炉シャフト部１８の周囲を囲むように設けられているので、レシーバータンク３８から高炉シャフト部に設けられたガス吹込みノズル１９までの流路は、８つのガス吹込みノズル間でほぼ等しくなる。これにより、レシーバータンク３８からそれぞれのガス吹込みノズル１９までの圧力損失の差を小さくすることができ、ガス吹込みノズル１９から吹込まれる予熱ガスの流量をさらに均一にできる。本実施形態では、ガス吹込みノズル１９には遮断弁が設けられていないので、ガス吹込みノズル１９を通じた高炉内への予熱ガスの吹込みは、遮断弁３６によって制御される。すなわち、遮断弁３６の弁が開放状態にされている場合に、ガス吹込みノズル１９から高炉内に予熱ガスが吹込まれ、遮断弁３６の弁が遮断状態にされている場合に、高炉内への予熱ガスの吹込みが停止される。 Further, since the receiver tank 38 is provided so as to surround the blast furnace shaft portion 18, the flow path from the receiver tank 38 to the gas injection nozzle 19 provided in the blast furnace shaft portion has eight gas injections. Almost equal between nozzles. Thereby, the difference of the pressure loss from the receiver tank 38 to each gas blowing nozzle 19 can be made small, and the flow volume of the preheating gas blown from the gas blowing nozzle 19 can be made more uniform. In the present embodiment, since the gas injection nozzle 19 is not provided with a cutoff valve, the injection of the preheated gas into the blast furnace through the gas injection nozzle 19 is controlled by the cutoff valve 36. That is, when the shut-off valve 36 is opened, preheated gas is blown into the blast furnace from the gas blowing nozzle 19 and when the shut-off valve 36 is shut off, the blast furnace enters the blast furnace. The preheating gas blowing is stopped.
ガス吹込みノズル１９から高炉内に予熱ガスを吹込むには、予熱ガスの圧力が、吹込む位置における高炉１０の炉内圧力より高いことが必要である。高炉内に予熱ガスを吹込むには、予熱ガスの圧力を高炉の炉内圧力よりも０．０２〜０．１０ＭＰａ以上高くすればよい。高炉の炉内圧力は、センサ２０によって測定できるので、予熱ガスとして好ましい圧力は、センサ２０によって測定される圧力に０．０２〜０．１０ＭＰａ以上を加えた圧力になる。 In order to blow the preheating gas into the blast furnace from the gas blowing nozzle 19, it is necessary that the pressure of the preheating gas is higher than the pressure inside the blast furnace 10 at the blowing position. In order to blow the preheating gas into the blast furnace, the pressure of the preheating gas may be set higher by 0.02 to 0.10 MPa or more than the pressure in the blast furnace. Since the in-furnace pressure of the blast furnace can be measured by the sensor 20, the pressure preferable as the preheating gas is a pressure obtained by adding 0.02 to 0.10 MPa or more to the pressure measured by the sensor 20.
昇圧機３２で昇圧させる圧力は、センサ５０によって測定された高炉ガスＧ０の圧力と、上記予熱ガスとして好ましい圧力とから定めることができる。回収される高炉ガスＧ０は、高炉の炉頂ガス圧（通常０．２０〜０．２５ＭＰａ）を維持している。このため、高炉ガスＧ０を用いることで、昇圧機３２では軽度に昇圧させるだけで、ガス吹込みノズル１９から高炉内に予熱ガスを吹込むための圧力を確保できる。 The pressure to be boosted by the booster 32 can be determined from the pressure of the blast furnace gas G 0 measured by the sensor 50 and the pressure preferable as the preheating gas. Blast furnace gas G 0 to be recovered maintains the furnace top gas pressure of the blast furnace (usually 0.20~0.25MPa). Accordingly, by using the blast furnace gas G 0, simply by booster 32 in mildly boosting, it can be secured pressure for blowing the preheating gas into the blast furnace through the gas blowing nozzle 19.
また、ガス吹込みノズル１９から高炉内に吹込む予熱ガスの温度が吹込む位置の炉内ガス温度より低いと高炉内を逆に冷やしてしまう。このため、予熱ガスの温度は、吹込む位置における高炉の炉内温度よりも高いことが必要である。このため、予熱ガスの温度を５００℃以上、より好ましくは８００℃以上にすることが好ましい。一方、予熱ガス流速などにも依存するが、予熱ガスの温度を１０００℃以上にすると高炉内のステーブへの熱負荷が大きくなるのでステーブ破損が懸念される。このため、予熱ガスの温度を１０００℃未満にすることが好ましい。 Moreover, if the temperature of the preheating gas blown into the blast furnace from the gas blowing nozzle 19 is lower than the furnace gas temperature at the blowing position, the inside of the blast furnace is cooled. For this reason, the temperature of the preheating gas needs to be higher than the in-furnace temperature of the blast furnace at the blowing position. For this reason, it is preferable that the temperature of the preheating gas is 500 ° C. or higher, more preferably 800 ° C. or higher. On the other hand, depending on the flow rate of the preheating gas, if the temperature of the preheating gas is set to 1000 ° C. or more, the heat load on the stave in the blast furnace increases, so there is a concern about stave breakage. For this reason, it is preferable to set the temperature of the preheating gas to less than 1000 ° C.
ガス吹込みノズル１９から高炉内に吹込む予熱ガスが酸素を含有すると、高炉内で還元中の鉄酸化物（Ｆｅ２Ｏ３、ＦｅＯ）を再酸化してしまう。このため、酸素濃度の低い予熱ガスを用いることが好ましく、酸素を含まない予熱ガスを用いることがより好ましい。したがって、燃焼炉３４に供給する支燃ガス４６の酸素は、ダストを含む高炉ガス組成から算出される燃焼に必要な理論酸素量を１以下にすることが好ましい。 When the preheating gas blown into the blast furnace from the gas blowing nozzle 19 contains oxygen, iron oxide (Fe 2 O 3 , FeO) being reduced in the blast furnace is reoxidized. For this reason, it is preferable to use a preheating gas having a low oxygen concentration, and it is more preferable to use a preheating gas not containing oxygen. Therefore, it is preferable that the oxygen of the combustion support gas 46 supplied to the combustion furnace 34 has a theoretical oxygen amount required for combustion calculated from a blast furnace gas composition including dusts of 1 or less.
さらに、ガス吹込みノズル１９から高炉内への予熱ガスの吹込みは、常時行ってもよく、また、センサ２１によって測定される炉頂温度が低下した場合にのみ行ってもよい。炉頂温度が低下したときに予熱ガスの吹込みを行う場合に、例えば、炉頂温度が所定温度以下（例えば、１１０℃以下）になった場合に、ガス吹込みノズル１９から予熱ガスの吹込みを行うとしてもよい。 Further, the preheating gas may be blown from the gas blowing nozzle 19 into the blast furnace at all times, or only when the furnace top temperature measured by the sensor 21 is lowered. When the preheating gas is blown when the furnace top temperature is lowered, for example, when the furnace top temperature is equal to or lower than a predetermined temperature (for example, 110 ° C. or lower), the preheating gas is blown from the gas blowing nozzle 19. May be included.
予熱ガスの吹込み量は、炉頂温度を概ね１００℃以上に維持できるようなガス吹込み量とすればよい。例えば、ＲＡＲ４７０ｋｇ／ｔ相当の高炉操業では、８００℃の予熱ガスを１００Ｎｍ３／ｔ吹込むことによって、炉上部の温度を１００℃以上に維持でき、これにより炉上部の昇温不良を解消できる。 The blowing amount of the preheating gas may be a gas blowing amount that can maintain the furnace top temperature at approximately 100 ° C. or higher. For example, in blast furnace operation equivalent to RAR 470 kg / t, the temperature of the upper part of the furnace can be maintained at 100 ° C. or more by blowing a preheated gas of 800 ° C. at 100 Nm 3 / t, thereby eliminating the temperature rise failure at the upper part of the furnace.
また、高炉内において吹抜けが発生し、炉頂圧力や炉頂温度が急激に上昇した場合に、高炉内からガス吹込みノズル１９を通じて炉内ガス、鉱石、コークス等の逆流が発生する。このため、センサ２１で、炉頂圧力または炉頂温度の少なくとも１つを測定し、予め定められた閾値を超える炉頂圧力または炉頂温度が検出された場合に、遮断弁３６の弁を遮断状態にし、レシーバータンク３８への予熱ガスの搬送を停止する。これにより、炉内ガスやコークスの逆流によって燃焼炉３４が破損することを防止できる。 Further, when a blow-through occurs in the blast furnace and the furnace top pressure and the furnace top temperature rise rapidly, a back flow of furnace gas, ore, coke and the like is generated from the blast furnace through the gas blowing nozzle 19. Therefore, the sensor 21 measures at least one of the furnace top pressure or the furnace top temperature, and shuts off the valve of the shutoff valve 36 when a furnace top pressure or a furnace top temperature exceeding a predetermined threshold is detected. Then, the conveyance of the preheated gas to the receiver tank 38 is stopped. Thereby, it is possible to prevent the combustion furnace 34 from being damaged by the backflow of the furnace gas and coke.
本実施形態において、高炉１０のシャフト部１８の炉周方向に等間隔となるよう８つのガス吹込みノズル１９を設けた例を示したが、これに限らない。ガス吹込みノズル１９の設置数や設置形態は特に限定しないが、炉周方向において等間隔で複数箇所に設けることが好ましい。特に、少なくとも、炉周方向において等間隔でｎ箇所（但し、ｎは４以上の偶数）に設け、予熱ガスの吹込み総量に応じて、前記ｎ箇所のガス吹込みノズル１９のなかから、予熱ガスの吹込みを行うガス吹込みノズル１９を炉周方向に等間隔に選択することが好ましい。この場合のガス吹込みノズル１９の等間隔での設置数は４、８、１６、３２、６４などである。なお、実際の設備では、ガス吹込みノズル１９を炉周方向に等間隔に設けることは、炉体冷却構造等との関係から困難な場合があるので、ガス吹込みノズル１９を設置する位置は、炉周方向に等間隔でなくてもよい。 In this embodiment, although the example which provided the eight gas blowing nozzles 19 so that it might become equal intervals in the furnace peripheral direction of the shaft part 18 of the blast furnace 10 was shown, it does not restrict to this. The number of gas blowing nozzles 19 and the installation form are not particularly limited, but are preferably provided at a plurality of locations at equal intervals in the furnace circumferential direction. In particular, at least n places (where n is an even number of 4 or more) at equal intervals in the furnace circumferential direction, and according to the total amount of preheated gas blowing, preheating is performed from among the n gas blowing nozzles 19. It is preferable to select the gas injection nozzles 19 that perform gas injection at equal intervals in the furnace circumferential direction. In this case, the number of gas blowing nozzles 19 installed at equal intervals is 4, 8, 16, 32, 64, or the like. In actual equipment, it may be difficult to provide the gas injection nozzles 19 at equal intervals in the furnace circumferential direction because of the relationship with the furnace body cooling structure and the like. , It may not be equally spaced in the furnace circumferential direction.
また、ガス吹込みノズル１９の設置位置は、シャフト部１８の中部から上部の範囲内が好ましく、特に、炉口半径をＲ０とし、ストックラインからの深さがＲ０となる位置をｐ１、シャフト部下端からの高さがシャフト部全高の１／３となる位置をｐ２としたとき、炉高方向において位置ｐ１と位置ｐ２との間にガス吹込みノズル１９を設置し、このガス吹込みノズル１９から予熱ガスを吹込むことが好ましい。ガス吹込みノズル１９の設置位置が高すぎると、高炉原料によって形成される鉱石層またはコークス層が堆積されておらず、その荷重が小さいので、予熱ガスを吹込むことで高炉原料が撹拌され、流動化が生じてしまい高炉原料の降下の安定性が損なわれるので好ましくない。一方、ガス吹込みノズル１９の設置位置が下すぎると、予熱ガスの吹込みが高炉内の軟化融着帯にかかる可能性が高くなるので好ましくない。 Also, the installation position of the gas blow nozzle 19 is preferably in the range of middle shaft portion 18 of the upper, in particular, the throat radius and R 0, p 1 the position where the depth from the stock line is R 0 , when the 1/3 a position height of the total height shaft portion from the shaft portion lower end and p 2, established the gas blow nozzle 19 between the position p 1 and the position p 2 in the furnace height direction, Preheating gas is preferably blown from the gas blowing nozzle 19. If the installation position of the gas blowing nozzle 19 is too high, the ore layer or coke layer formed by the blast furnace raw material is not deposited and the load is small, so the blast furnace raw material is stirred by blowing the preheating gas, Since fluidization occurs and the stability of descent of the blast furnace raw material is impaired, it is not preferable. On the other hand, if the installation position of the gas blowing nozzle 19 is too low, there is a high possibility that the blowing of the preheated gas will be applied to the softened cohesive zone in the blast furnace.
本実施形態に係る高炉シャフト部への予熱ガス吹込み装置３０および予熱ガス吹込み方法では、高炉内に吹込む予熱ガスを、高炉ガスＧ０を用いて生成している。このように、高炉ガスＧ０を用いることで、高炉ガスＧ０の圧力および温度を利用できるので、昇圧機３２で高圧ガスを生成させるためのエネルギーおよび燃焼炉３４で予熱ガスを生成するためのエネルギーを少なくできる。 The preheating gas blow device 30 and the preheating gas blowing method of the blast furnace shaft portion according to the present embodiment, the blown preheating gas into the blast furnace, are generated using the blast furnace gas G 0. In this manner, by using the blast furnace gas G 0, it is possible to utilize the pressure and temperature of the blast furnace gas G 0, to produce a preheated gas energy and combustion furnace 34 for generating a high-pressure gas booster 32 Energy can be reduced.
また、通常の高炉操業では１０〜３０ｋｇ／ｔ（炭素濃度２０〜３０質量％）のダストが高炉ガスＧ０とともに排出されているので、当該ダストを燃焼炉３４で予熱ガスを生成するための燃料の一部として使用できる。仮に、ダスト排出量原単位が２５ｋｇ／ｔ（炭素濃度２５質量％）であったとすると、２２．９ｋｇ／ｔのＣＯ２排出量を削減できるので、高炉の低ＲＡＲ操業にも寄与できる。また、炭素を燃焼させる分、高炉ガスＧ０の循環量を少なくできるので、燃焼用の酸素量も減らすことができる。 Further, in normal blast furnace operation, 10 to 30 kg / t (carbon concentration 20 to 30% by mass) of dust is discharged together with the blast furnace gas G 0 , so that the fuel for generating the preheating gas in the combustion furnace 34 is used. Can be used as part of If the dust emission basic unit is 25 kg / t (carbon concentration 25% by mass), the CO 2 emission of 22.9 kg / t can be reduced, which can contribute to the low RAR operation of the blast furnace. Also, minutes to burn the carbon, it is possible to reduce the circulation amount of the blast furnace gas G 0, can also reduce the amount of oxygen for combustion.
また、高炉ガスＧ０以外のガスを高炉ガスＧ０とともに燃焼炉３４に導入し、炉内に吹込むための予熱ガスを得てもよい。高炉ガスＧ０以外のガスとしては、例えば、湿式除塵機２４よりも下流側から抜き出した高炉ガスを用いることができる。すなわち、図１に破線で示すように、湿式除塵機２４と炉頂ガス発電装置２６との間から抜き出した高炉ガスまたは／および炉頂ガス発電装置２６の下流側から抜き出した高炉ガスを、昇圧機３２で昇圧して燃焼炉３４に導入する。湿式除塵機２４で処理された高炉ガスを使用する場合は、より清浄なガスを使用することになるので、高圧ガス流路４２、予熱ガス流路４４や燃焼炉３４でのダストの影響を受けにくく、より安定した予熱ガスの吹込みが実施できる。しかしながら、ダストキャッチャー２２および湿式除塵機２４で高炉ガスＧ０の圧力が低下するので、昇圧機３２で高圧ガスを生成させるためのエネルギーが多く必要となる。なお、高炉ガスＧ０以外のガスとして、例えば、製鉄所のガスホルダーに貯蔵されている高炉発生ガス（Ｂガス）、または高炉発生ガスとコークス炉発生ガス（Ｃガス）の混合ガスなどを用いることもできる。 Furthermore, the blast furnace gas G 0 other gas is introduced into the combustion furnace 34 with blast furnace gas G 0, may be obtained pre-heating gas for blowing into the furnace. The blast furnace gas G 0 other than gas, for example, than the wet dust remover 24 can be used blast furnace gas extracted from the downstream side. That is, as shown by a broken line in FIG. 1, the blast furnace gas extracted from between the wet dust remover 24 and the top gas power generation device 26 and / or the blast furnace gas extracted from the downstream side of the top gas power generation device 26 is boosted. The pressure is increased by the machine 32 and introduced into the combustion furnace 34. When using the blast furnace gas processed by the wet dust remover 24, a cleaner gas is used. Therefore, the blast furnace gas is affected by dust in the high pressure gas passage 42, the preheating gas passage 44 and the combustion furnace 34. Difficult and more stable preheating gas can be injected. However, since the pressure of the blast furnace gas G 0 is reduced in the dust catcher 22 and wet dust remover 24, the energy for generating a high-pressure gas often required by booster 32. As the blast furnace gas G 0 other than gas, for example, using a mixed gas of the blast furnace generating gas stored in the gas holder steelworks (B gas), or blast furnace gas generated and coke oven gas generated (C gas) You can also.
以上説明したように、貯蔵室３５で予熱ガスの温度を調整することで、燃焼炉における燃焼の制御よる温度調整よりも容易であって高い精度で予熱ガスの温度を調整できるので、本実施形態に係る高炉シャフト部への予熱ガス吹込み装置および予熱ガス吹込み方法を用いることで、貯蔵室３５で温度が適切に調整された予熱ガスを、レシーバータンク３８を介して高炉内に吹込むことができる。このように温度が適切に調整された予熱ガスを高炉内に吹込むことで、炉上部の昇温不良を解消でき、通常高炉および酸素高炉の安定操業を維持できる。 As described above, by adjusting the temperature of the preheating gas in the storage chamber 35, the temperature of the preheating gas can be adjusted with higher accuracy and easier than temperature adjustment by controlling combustion in the combustion furnace. By using the preheating gas blowing device and the preheating gas blowing method to the blast furnace shaft portion according to the above, the preheating gas whose temperature is appropriately adjusted in the storage chamber 35 is blown into the blast furnace through the receiver tank 38. Can do. By blowing the preheated gas whose temperature is appropriately adjusted in this way into the blast furnace, the temperature rise failure at the upper part of the furnace can be eliminated, and the stable operation of the normal blast furnace and the oxygen blast furnace can be maintained.
本実施形態に係る高炉シャフト部への予熱ガス吹込み装置３０では、貯蔵室３５とレシーバータンク３８を接続する予熱ガス流路４４に遮断弁３６を設けて予熱ガスの吹込みを制御する。このように、予熱ガス流路４４に遮断弁３６を設けることによって遮断弁を１つに集約でき、仮に、高炉内で吹抜けが発生してガス吹込みノズル１９から炉内ガス、鉱石、コークス等が逆流しても遮断弁３６の弁を遮断状態にすることで燃焼炉３４に、炉内ガス、鉱石、コークス等が到達することを防止できる。特に、８００℃以上の高温環境下に設置可能な遮断弁は非常に高価であることから、本実施形態に係る高炉シャフト部へのガス吹込み装置を用いることで遮断弁３６の設置数を少なくでき、これにより、高炉１０を含む高炉シャフト部への予熱ガス吹込み装置３０全体の設備コストの上昇を抑制できる。 In the preheating gas blowing device 30 to the blast furnace shaft portion according to the present embodiment, the shutoff valve 36 is provided in the preheating gas flow path 44 connecting the storage chamber 35 and the receiver tank 38 to control the blowing of the preheating gas. In this way, by providing the shut-off valve 36 in the preheating gas flow path 44, the shut-off valves can be integrated into one, and tentatively, blow-off occurs in the blast furnace, and the gas in the furnace, gas, ore, coke, etc. Even if the gas flows backward, by setting the shut-off valve 36 to the shut-off state, it is possible to prevent the in-furnace gas, ore, coke and the like from reaching the combustion furnace 34. In particular, shut-off valves that can be installed in a high-temperature environment of 800 ° C. or higher are very expensive. Therefore, the number of shut-off valves 36 can be reduced by using the gas blowing device for the blast furnace shaft according to this embodiment. This can suppress an increase in equipment cost of the entire preheated gas blowing device 30 to the blast furnace shaft portion including the blast furnace 10.
なお、本実施形態では、高炉シャフト部への予熱ガス吹込み装置３０および予熱ガス吹込み方法を通常高炉に適用した例を示したが、これに限らない。例えば、本実施形態に係る予熱ガス吹込み装置３０および予熱ガス吹込み方法を、羽口１４から常温の純酸素を高炉内に吹込むことにより溶銑を製造する酸素高炉に適用してもよい。但し、酸素高炉において、支燃ガス４６および希釈ガスに窒素を含むガスを用いることは、酸素高炉プロセスに反することになるので、酸素高炉に適用させる場合には、支燃ガス４６として純酸素、希釈ガスとして酸素高炉ガスＧ０を昇圧させた高圧ガスを用いる必要がある。
［実験例１］
In the present embodiment, the example in which the preheating gas blowing device 30 and the preheating gas blowing method to the blast furnace shaft portion are applied to a normal blast furnace is shown, but the present invention is not limited thereto. For example, the preheating gas blowing device 30 and the preheating gas blowing method according to the present embodiment may be applied to an oxygen blast furnace that produces hot metal by blowing pure oxygen at room temperature from the tuyere 14 into the blast furnace. However, in the oxygen blast furnace, using a gas containing nitrogen as the combustion support gas 46 and the dilution gas is contrary to the oxygen blast furnace process. Therefore, when applied to the oxygen blast furnace, pure oxygen, it is necessary to use a high-pressure gas is boosted oxygen blast furnace gas G 0 as a diluent gas.
[Experimental Example 1]
図２は、実験例１で用いたオフライン実験装置６０および実験条件の概要を示す模式図である。図２に示すオフライン実験装置６０を用いて、本実施形態に係る高炉シャフト部への予熱ガス吹込み方法を通常高炉に適用させることを想定して検証実験を実施した。 FIG. 2 is a schematic diagram showing an outline of the offline experimental device 60 and experimental conditions used in Experimental Example 1. Using the off-line experimental apparatus 60 shown in FIG. 2, a verification experiment was performed assuming that the preheated gas blowing method to the blast furnace shaft portion according to this embodiment is applied to a normal blast furnace.
オフライン実験装置６０は、燃焼炉６４と、予熱ガス流路６６と、貯蔵室７０と、予熱ガス流路７４と、センサ６８と、センサ７６とから構成される。まず、空気６１と高炉ガスの成分を模して成分調整された模擬高炉ガス６２を燃焼炉６４へ吹込んで、模擬高炉ガス６２に含まれるＣＯを、空気を用いて燃焼させて予熱ガス（希釈前）６７を生成する。 The offline experimental apparatus 60 includes a combustion furnace 64, a preheating gas channel 66, a storage chamber 70, a preheating gas channel 74, a sensor 68, and a sensor 76. First, a simulated blast furnace gas 62 whose components are adjusted by imitating the components of the air 61 and the blast furnace gas is blown into the combustion furnace 64, and CO contained in the simulated blast furnace gas 62 is combusted using air to produce a preheated gas (diluted). Before) 67 is generated.
予熱ガス流路６６は、燃焼炉６４と貯蔵室７０を接続する流路である。燃焼炉６４で生成された予熱ガス（希釈前）６７を、予熱ガス流路６６を通じて貯蔵室７０に搬送する。貯蔵室７０にはセンサ６８が設けられており、当該センサを用いて貯蔵室７０に搬送された予熱ガス（希釈前）６７の温度と成分を測定する。 The preheating gas channel 66 is a channel that connects the combustion furnace 64 and the storage chamber 70. The preheated gas (before dilution) 67 generated in the combustion furnace 64 is conveyed to the storage chamber 70 through the preheated gas channel 66. A sensor 68 is provided in the storage chamber 70, and the temperature and components of the preheated gas (before dilution) 67 conveyed to the storage chamber 70 are measured using the sensor 68.
貯蔵室７６では、希釈ガスとして模擬高炉ガス６２または窒素７２が混合され、予熱ガス６７の温度が調整される。予熱ガス流路７４は、貯蔵室７０とレシーバータンク７８とを接続する流路である。貯蔵室７６で希釈された予熱ガス（希釈後）７４を、予熱ガス流路７４を通じてレシーバータンク７８に搬送する。予熱ガス流路７４にはセンサ７６が設けられており、当該センサを用いて予熱ガス（希釈後）７４の温度と成分を測定する。このように動作するオフライン実験装置６０を用いて、予熱ガス（希釈前）６７と、予熱ガス（希釈後）７４の温度と成分を測定した。その結果を表１に示す。 In the storage chamber 76, the simulated blast furnace gas 62 or nitrogen 72 is mixed as a dilution gas, and the temperature of the preheating gas 67 is adjusted. The preheating gas channel 74 is a channel that connects the storage chamber 70 and the receiver tank 78. The preheating gas (after dilution) 74 diluted in the storage chamber 76 is conveyed to the receiver tank 78 through the preheating gas channel 74. A sensor 76 is provided in the preheating gas channel 74, and the temperature and components of the preheating gas (after dilution) 74 are measured using the sensor. Using the off-line experimental apparatus 60 operating in this manner, the temperature and components of the preheating gas (before dilution) 67 and the preheating gas (after dilution) 74 were measured. The results are shown in Table 1.
実験例１では、燃焼炉６４に模擬高炉ガス６２のＣＯと空気との酸素比が１程度になるように、空気６１と模擬高炉ガス６２を吹込んで、模擬高炉ガス６２に含まれるＣＯを燃焼させた。燃焼炉６４で燃焼されて生成される予熱ガスは、燃焼炉やバーナーの形状に依存するが、１１００〜１３００℃になる。実験例１において予熱ガス（希釈前）６７の温度は１１８０℃であった。１０００℃以上の予熱ガスを高炉に吹込むと高炉内のステーブへの熱負荷が大きくなり、ステーブ破損が発生するので、高炉内に吹込む予熱ガスとして高すぎる温度であった。一方、予熱ガス（希釈前）６７の酸素濃度は０．１質量％以下であり、当該予熱ガスが高炉内に吹込まれたとしても高炉内の還元中の鉄酸化物（Ｆｅ２Ｏ３、ＦｅＯ）の再酸化が懸念される濃度ではなかった。 In Experimental Example 1, air 61 and simulated blast furnace gas 62 are blown into the combustion furnace 64 so that the oxygen ratio of CO and air of the simulated blast furnace gas 62 is about 1, and CO contained in the simulated blast furnace gas 62 is combusted. I let you. The preheating gas generated by burning in the combustion furnace 64 is 1100 to 1300 ° C., depending on the shape of the combustion furnace and the burner. In Experimental Example 1, the temperature of the preheated gas (before dilution) 67 was 1180 ° C. When a preheated gas of 1000 ° C. or higher was blown into the blast furnace, the heat load on the stave in the blast furnace was increased and the stave was broken. Therefore, the temperature was too high as the preheated gas blown into the blast furnace. On the other hand, the oxygen concentration of the preheating gas (before dilution) 67 is 0.1% by mass or less, and even if the preheating gas is blown into the blast furnace, iron oxide (Fe 2 O 3 , FeO) being reduced in the blast furnace. ) Was not the concentration at which reoxidation was a concern.
発明例１では、希釈ガスとして模擬高炉ガス６２を用いた。２０Ｎｍ３／ｈの流量で貯蔵室７０に模擬高炉ガス６２を導入して、予熱ガス（希釈前）６７を希釈した。これにより、予熱ガス（希釈後）７５の温度を、目標温度の１０００℃未満を満足する７９０℃に調整できた。 In Invention Example 1, simulated blast furnace gas 62 was used as the dilution gas. The simulated blast furnace gas 62 was introduced into the storage chamber 70 at a flow rate of 20 Nm 3 / h to dilute the preheating gas (before dilution) 67. As a result, the temperature of the preheated gas (after dilution) 75 could be adjusted to 790 ° C., which satisfies the target temperature of less than 1000 ° C.
発明例２では、希釈ガスとして窒素７２を用いた。２０Ｎｍ３／ｈの流量で貯蔵室７０に窒素７２を導入し、予熱ガス（希釈前）６７を希釈した。これにより、予熱ガス（希釈後）７５の温度を、目標温度の１０００℃未満を満足する７７０℃に調整できた。 In Invention Example 2, nitrogen 72 was used as the diluent gas. Nitrogen 72 was introduced into the storage chamber 70 at a flow rate of 20 Nm 3 / h to dilute the preheating gas (before dilution) 67. As a result, the temperature of the preheated gas (after dilution) 75 could be adjusted to 770 ° C., which satisfies the target temperature of less than 1000 ° C.
このように、本実施形態に係る予熱ガス吹込み方法を用いることで、予熱ガスの温度を適切な温度に調整できることが確認され、通常高炉においてもシャフト部へ適切な温度に調整された予熱ガスを吹込むことができ、これにより、通常高炉の安定操業に寄与できることが確認された。
［実験例２］
Thus, it was confirmed that the temperature of the preheating gas can be adjusted to an appropriate temperature by using the preheating gas blowing method according to the present embodiment, and the preheating gas adjusted to an appropriate temperature to the shaft portion even in a normal blast furnace. It was confirmed that this can contribute to the stable operation of the normal blast furnace.
[Experiment 2]
図３は、実験例２で用いたオフライン実験装置６０および実験条件の概要を示す模式図である。図３に示すオフライン実験装置６０を用いて、本実施形態に係る高炉シャフト部への予熱ガス吹込み方法を酸素高炉に適用させることを想定して検証実験を実施した。 FIG. 3 is a schematic diagram showing an outline of the offline experimental apparatus 60 and experimental conditions used in Experimental Example 2. Using the off-line experiment apparatus 60 shown in FIG. 3, a verification experiment was conducted assuming that the preheating gas blowing method to the blast furnace shaft portion according to the present embodiment is applied to the oxygen blast furnace.
まず、純酸素８０と酸素高炉ガスの成分を模して成分調整された模擬高炉ガス８２を燃焼炉６４へ吹込んで、模擬高炉ガス８２に含まれるＣＯを、酸素を用いて燃焼させて予熱ガス（希釈前）６７を生成する。燃焼炉６４で生成された予熱ガス（希釈前）６７を、予熱ガス流路６６を通じて貯蔵室７０に搬送する。貯蔵室７０にはセンサ６８が設けられており、当該センサを用いて貯蔵室７０に搬送された予熱ガス（希釈前）６７の温度と成分を測定する。 First, a simulated blast furnace gas 82, which is prepared by imitating components of pure oxygen 80 and oxygen blast furnace gas, is blown into the combustion furnace 64, and CO contained in the simulated blast furnace gas 82 is burned using oxygen to be a preheating gas. 67 (before dilution) is produced. The preheated gas (before dilution) 67 generated in the combustion furnace 64 is conveyed to the storage chamber 70 through the preheated gas channel 66. A sensor 68 is provided in the storage chamber 70, and the temperature and components of the preheated gas (before dilution) 67 conveyed to the storage chamber 70 are measured using the sensor 68.
貯蔵室７０では、希釈ガスとして模擬高炉ガス８２が混合され、予熱ガス（希釈前）６７の温度が調整される。貯蔵室７０で希釈された予熱ガス（希釈後）７４を、予熱ガス流路７４を通じてレシーバータンク７８に搬送する。予熱ガス流路７４にはセンサ７６が設けられており、当該センサを用いて予熱ガス（希釈後）７４の温度と成分を測定する。このように動作するオフライン実験装置６０を用いて、予熱ガス（希釈前）６７と、予熱ガス（希釈後）７４の温度と成分を測定した。その結果を表２に示す。 In the storage chamber 70, the simulated blast furnace gas 82 is mixed as a dilution gas, and the temperature of the preheating gas (before dilution) 67 is adjusted. The preheated gas (after dilution) 74 diluted in the storage chamber 70 is conveyed to the receiver tank 78 through the preheated gas channel 74. A sensor 76 is provided in the preheating gas channel 74, and the temperature and components of the preheating gas (after dilution) 74 are measured using the sensor. Using the off-line experimental apparatus 60 operating in this manner, the temperature and components of the preheating gas (before dilution) 67 and the preheating gas (after dilution) 74 were measured. The results are shown in Table 2.
実験例２では、燃焼炉６４に模擬高炉ガス８２のＣＯと空気との酸素比が１程度になるように、純酸素８０と模擬高炉ガス８２を吹込んで、模擬高炉ガス８２に含まれるＣＯを燃焼させた。実験例２において、予熱ガス（希釈前）６７の温度は１７３０℃であった。１０００℃以上の予熱ガスを高炉に吹込むと高炉内のステーブへの熱負荷が大きくなり、ステーブ破損が発生するので、高炉内に吹込む予熱ガスとして高すぎる温度であった。一方、酸素濃度は、０．１質量％以下であり、高炉内に吹込まれた後に、内部の還元中の鉄酸化物（Ｆｅ２Ｏ３，ＦｅＯ）の再酸化が懸念される濃度ではなかった。 In Experimental Example 2, pure oxygen 80 and simulated blast furnace gas 82 were blown into the combustion furnace 64 so that the oxygen ratio between CO and air in the simulated blast furnace gas 82 was about 1, and the CO contained in the simulated blast furnace gas 82 was reduced. Burned. In Experimental Example 2, the temperature of the preheated gas (before dilution) 67 was 1730 ° C. When a preheated gas of 1000 ° C. or higher was blown into the blast furnace, the heat load on the stave in the blast furnace was increased and the stave was broken. Therefore, the temperature was too high as the preheated gas blown into the blast furnace. On the other hand, the oxygen concentration was 0.1% by mass or less, and it was not a concentration at which reoxidation of iron oxides (Fe 2 O 3 , FeO) during reduction inside the blast furnace was a concern. .
発明例１１では、希釈ガスとして模擬高炉ガス８２を用いた。１６Ｎｍ３／ｈの流量で貯蔵室７０に模擬高炉ガス８２を導入して、予熱ガス（希釈前）６７を希釈した。これにより、予熱ガス（希釈後）７５の温度を、目標温度の１０００℃未満を満足する９５０℃に調整できた。 In Invention Example 11, simulated blast furnace gas 82 was used as the dilution gas. The simulated blast furnace gas 82 was introduced into the storage chamber 70 at a flow rate of 16 Nm 3 / h to dilute the preheating gas (before dilution) 67. Thereby, the temperature of the preheating gas (after dilution) 75 could be adjusted to 950 ° C. that satisfies the target temperature of less than 1000 ° C.
発明例１２においても、希釈ガスとして模擬高炉ガス８２を用いた。３０Ｎｍ３／ｈの流量で貯蔵室７０に模擬高炉ガス８２を導入して、予熱ガス（希釈前）６７を希釈した。これにより、予熱ガス（希釈後）７５の温度を、目標温度の１０００℃未満を満足する６８０℃に調整できた。 Also in Example 12, the simulated blast furnace gas 82 was used as the dilution gas. The simulated blast furnace gas 82 was introduced into the storage chamber 70 at a flow rate of 30 Nm 3 / h to dilute the preheating gas (before dilution) 67. As a result, the temperature of the preheating gas (after dilution) 75 could be adjusted to 680 ° C., which satisfies the target temperature of less than 1000 ° C.
このように、本実施形態に係る予熱ガス吹込み方法を用いることで、予熱ガスの温度を適切な温度に調整できることが確認され、酸素高炉においてもシャフト部へ適切な温度に調整された予熱ガスを吹込むことができ、これにより、通常高炉の安定操業に寄与できることが確認された。 Thus, it was confirmed that the temperature of the preheating gas can be adjusted to an appropriate temperature by using the preheating gas blowing method according to the present embodiment, and the preheating gas adjusted to an appropriate temperature to the shaft portion even in the oxygen blast furnace. It was confirmed that this can contribute to the stable operation of the normal blast furnace.
１０ 高炉
１４ 羽口
１６ 補助還元材
１７ 熱風
１８ シャフト部
１９ ガス吹込みノズル
２０ センサ
２１ センサ
２２ ダストキャッチャー
２４ 湿式除塵機
２６ 炉頂ガス発電装置
２８ 系外
３０ 予熱ガス吹込み装置
３２ 昇圧機
３４ 燃焼炉
３５ 貯蔵室
３６ 遮断弁
３８ レシーバータンク
４０ 回収流路
４２ 高圧ガス流路
４３ 高圧ガス流路
４４ 予熱ガス流路
４５ 予熱ガス流路
４６ 支燃ガス
４７ 窒素
４８ センサ
５０ センサ
５２ センサ
６０ オフライン実験装置
６１ 空気
６２ 模擬高炉ガス
６４ 燃焼炉
６６ 予熱ガス流路
６７ 予熱ガス（希釈前）
６８ センサ
７０ 貯蔵室
７２ 窒素
７４ 予熱ガス流路
７５ 予熱ガス（希釈後）
７６ センサ
７８ レシーバータンク
８０ 純酸素
８２ 模擬高炉ガス
DESCRIPTION OF SYMBOLS 10 Blast furnace 14 tuyere 16 Auxiliary reducing material 17 Hot air 18 Shaft part 19 Gas injection nozzle 20 Sensor 21 Sensor 22 Dust catcher 24 Wet dust remover 26 Top gas generator 28 Out-of-system 30 Preheating gas injection device 32 Booster 34 Combustion Furnace 35 Storage chamber 36 Shut-off valve 38 Receiver tank 40 Recovery flow path 42 High pressure gas flow path 43 High pressure gas flow path 44 Preheating gas flow path 45 Preheating gas flow path 46 Combustion gas 47 Nitrogen 48 Sensor 50 Sensor 52 Sensor 60 Offline experimental device 61 Air 62 Simulated blast furnace gas 64 Combustion furnace 66 Preheating gas flow path 67 Preheating gas (before dilution)
68 Sensor 70 Storage chamber 72 Nitrogen 74 Preheated gas flow path 75 Preheated gas (after dilution)
76 Sensor 78 Receiver tank 80 Pure oxygen 82 Simulated blast furnace gas
Claims (6)
昇圧された高炉ガスを燃焼して予熱ガスを生成する燃焼炉と、
前記燃焼炉で生成された予熱ガスを貯蔵する貯蔵室と、
前記貯蔵室に希釈ガスを供給する希釈ガス流路と、
高炉シャフト部を囲むように設けられた環状管であるレシーバータンクと、
を有し、
前記レシーバータンクは、前記貯蔵室と、高炉シャフト部の円周方向に設置された複数のガス吹込みノズルとに接続され、
前記貯蔵室には、少なくとも前記予熱ガスの温度を測定するセンサが設けられ、
前記貯蔵室と前記レシーバータンクとの間には遮断弁が設けられている、高炉シャフト部への予熱ガス吹込み装置。 A booster for boosting the blast furnace gas;
A combustion furnace that generates preheated gas by combusting the pressurized blast furnace gas;
A storage chamber for storing preheated gas generated in the combustion furnace;
A dilution gas flow path for supplying a dilution gas to the storage chamber;
A receiver tank that is an annular pipe provided to surround the blast furnace shaft portion;
Have
The receiver tank is connected to the storage chamber and a plurality of gas blowing nozzles installed in the circumferential direction of the blast furnace shaft portion ,
The storage chamber is provided with a sensor for measuring at least the temperature of the preheating gas,
A preheating gas blowing device for a blast furnace shaft portion, wherein a shutoff valve is provided between the storage chamber and the receiver tank .
前記高炉ガスを昇圧して高圧ガスを生成し、
前記高圧ガスを燃焼して予熱ガスを生成し、
前記予熱ガスを貯蔵室に貯蔵し、
前記貯蔵室に貯蔵された予熱ガスを、高炉シャフト部を囲むように設けられた環状管を通じて高炉シャフト部の円周方向から高炉内に吹込む予熱ガスの吹込み方法であって、
前記貯蔵室に希釈ガスを導入することで、前記貯蔵室に貯蔵された前記予熱ガスの温度を調整し、
前記貯蔵室と前記環状管の間に遮断弁が設けられ、
前記予熱ガスの温度が調整された後に、前記遮断弁を開いて前記予熱ガスを前記高炉内に吹込む、予熱ガス吹込み方法。 Recover the blast furnace gas,
Pressurizing the blast furnace gas to produce high pressure gas,
Combusting the high-pressure gas to generate a preheating gas,
Storing the preheating gas in a storage room;
The preheating gas stored in the storage chamber is a preheating gas blowing method for blowing into the blast furnace from the circumferential direction of the blast furnace shaft portion through an annular pipe provided so as to surround the blast furnace shaft portion,
By introducing a dilution gas into the storage chamber, the temperature of the preheating gas stored in the storage chamber is adjusted ,
A shut-off valve is provided between the storage chamber and the annular pipe;
A preheating gas blowing method in which, after the temperature of the preheating gas is adjusted, the shutoff valve is opened and the preheating gas is blown into the blast furnace .
前記高炉ガスを昇圧して高圧ガスを生成し、
前記高圧ガスを燃焼して予熱ガスを生成し、
前記予熱ガスを貯蔵室に貯蔵し、
前記貯蔵室に貯蔵された予熱ガスを、高炉シャフト部を囲むように設けられた環状管を通じて高炉シャフト部の円周方向から高炉内に吹込む予熱ガスの吹込み方法であって、
前記貯蔵室に希釈ガスを導入することで、前記貯蔵室に貯蔵された前記予熱ガスの温度を調整し、
前記希釈ガスは窒素である、予熱ガスの吹込み方法。 Recover the blast furnace gas,
Pressurizing the blast furnace gas to produce high pressure gas,
Combusting the high-pressure gas to generate a preheating gas,
Storing the preheating gas in a storage room;
The preheating gas stored in the storage chamber is a preheating gas blowing method for blowing into the blast furnace from the circumferential direction of the blast furnace shaft portion through an annular pipe provided so as to surround the blast furnace shaft portion,
By introducing a dilution gas into the storage chamber, the temperature of the preheating gas stored in the storage chamber is adjusted ,
The preheating gas blowing method, wherein the dilution gas is nitrogen .
請求項２から請求項４のいずれか一項に記載の予熱ガス吹込み方法で、高炉シャフト部の円周方向から高炉内に予熱ガスを吹込む、高炉操業方法。 A blast furnace operating method in which oxygen is blown from the tuyeres at the bottom of the blast furnace furnace,
A blast furnace operating method in which the preheating gas is injected into the blast furnace from the circumferential direction of the blast furnace shaft portion by the preheating gas injection method according to any one of claims 2 to 4 .
請求項２から請求項４のいずれか一項に記載の予熱ガス吹込み方法で、高炉シャフト部の円周方向から高炉内に予熱ガスを吹込む、高炉操業方法。 A blast furnace operating method in which air or oxygen-enriched air is blown from a tuyere at the bottom of the blast furnace furnace,
A blast furnace operating method in which the preheating gas is injected into the blast furnace from the circumferential direction of the blast furnace shaft portion by the preheating gas injection method according to any one of claims 2 to 4 .
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| EP2870225A2 (en) * | 2012-07-03 | 2015-05-13 | HYL Technologies, S.A. de C.V. | Method and system for operating a blast furnace with top-gas recycle and a fired tubular heater |
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