JP6954824B2 - Hot air furnace equipment and hot air furnace operation method - Google Patents

Hot air furnace equipment and hot air furnace operation method Download PDF

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JP6954824B2
JP6954824B2 JP2017242038A JP2017242038A JP6954824B2 JP 6954824 B2 JP6954824 B2 JP 6954824B2 JP 2017242038 A JP2017242038 A JP 2017242038A JP 2017242038 A JP2017242038 A JP 2017242038A JP 6954824 B2 JP6954824 B2 JP 6954824B2
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furnace
hot air
combustion
blast
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JP2019108583A (en
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健吾 薄井
健吾 薄井
昭二 古舘
昭二 古舘
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Nippon Steel Engineering Co Ltd
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Priority to KR1020207020460A priority patent/KR102443024B1/en
Priority to CN201880079434.1A priority patent/CN111684083A/en
Priority to PCT/JP2018/032444 priority patent/WO2019123727A1/en
Priority to BR112020012112-6A priority patent/BR112020012112B1/en
Priority to RU2020119665A priority patent/RU2769340C2/en
Priority to EP18892629.9A priority patent/EP3730631B1/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/007—Controlling or regulating of the top pressure
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/06—Making pig-iron in the blast furnace using top gas in the blast furnace process
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B9/00—Stoves for heating the blast in blast furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B9/00—Stoves for heating the blast in blast furnaces
    • C21B9/02—Brick hot-blast stoves
    • C21B9/04—Brick hot-blast stoves with combustion shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/22—Arrangements of heat-exchange apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
    • C21B2100/64—Controlling the physical properties of the gas, e.g. pressure or temperature
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
    • C21B2100/66—Heat exchange

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Environmental & Geological Engineering (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Air Supply (AREA)
  • Blast Furnaces (AREA)
  • Vending Machines For Individual Products (AREA)
  • Electric Stoves And Ranges (AREA)
  • Massaging Devices (AREA)

Description

本発明は熱風炉装置および熱風炉運転方法に関する。 The present invention relates to a hot air furnace device and a hot air furnace operating method.

製銑用の高炉に熱風を供給するために、熱風炉が用いられている（特許文献１参照）。
熱風炉においては、燃焼運転と送風運転とが繰り返される。
燃焼運転の際には、外部から燃料ガスおよび空気が供給され、これらを内部で燃焼させることで、熱風炉内の蓄熱煉瓦が高温まで加熱される。
送風運転には、燃焼時とは逆向きに空気が供給され、供給された空気は蓄熱煉瓦で加熱され、高温とされて高炉へと供給される。 A hot air furnace is used to supply hot air to a blast furnace for iron making (see Patent Document 1).
In the hot blast furnace, the combustion operation and the blast operation are repeated.
During the combustion operation, fuel gas and air are supplied from the outside, and by burning these inside, the heat storage brick in the hot air furnace is heated to a high temperature.
In the blast operation, air is supplied in the direction opposite to that at the time of combustion, and the supplied air is heated by the heat storage brick, heated to a high temperature, and supplied to the blast furnace.

熱風炉は複数本が並列に設置され、一つが燃焼運転する間にも他が送風運転を続けることで、高炉への熱風の供給が途絶えないようにしている。
通常、燃焼運転の際には、燃料ガスとして高炉の炉頂ガス（ＢＦＧ）が利用される。燃焼排気は大気開放されるため、熱風炉内圧力は大気圧よりやや高い程度とされる。
一方、送風運転の際には、高圧の高炉内部に熱風を吹き込むべく、ブロアなどで加圧された空気が熱風炉内に導入されており、熱風炉内圧力は高炉の内部圧力以上とされる。 Multiple hot blast furnaces are installed in parallel, and while one is in combustion operation, the other continues in blast operation so that the supply of hot air to the blast furnace is not interrupted.
Normally, during the combustion operation, the top gas (BFG) of the blast furnace is used as the fuel gas. Since the combustion exhaust is open to the atmosphere, the pressure inside the hot air furnace is considered to be slightly higher than the atmospheric pressure.
On the other hand, during the blowing operation, air pressurized by a blower or the like is introduced into the hot blast furnace in order to blow hot air into the high pressure blast furnace, and the pressure inside the hot blast furnace is considered to be higher than the internal pressure of the blast furnace. ..

熱風炉の運用にあたっては、燃焼運転と送風運転とを所定時間毎に切り替えるとともに、切り替えの際に各々の熱風炉内圧力に応じた圧力調整を行っていた。
燃焼運転から送風運転へ切り換える際には、均圧運転を行い、加圧された空気を熱風炉内へ導入し、熱風炉内の圧力を高めていた。
送風運転から燃焼運転に切り換える際には、排圧運転を行い、熱風炉内から徐々に排気することで、熱風炉内の圧力を下げていた。 In the operation of the hot blast furnace, the combustion operation and the blast operation were switched at predetermined time intervals, and the pressure was adjusted according to the pressure inside each hot blast furnace at the time of switching.
When switching from the combustion operation to the blower operation, the pressure equalizing operation was performed and the pressurized air was introduced into the hot air furnace to increase the pressure in the hot air furnace.
When switching from the blowing operation to the combustion operation, the exhaust pressure operation was performed and the pressure in the hot air furnace was lowered by gradually exhausting the air from the hot air furnace.

ところで、特許文献１の熱風炉装置では、燃焼運転の際に供給される燃料ガスおよび空気の圧力を高めることで、いくつかの改善が図られている。
すなわち、燃焼運転時の熱風炉内圧力を従来の大気圧程度よりも高めることで、燃焼ガスの体積を削減し、炉体および設備の小型化が可能となる。また、燃焼運転時の熱風炉内圧力を送風運転時の熱風炉内圧力に近づけることで、各々の間の圧力差が小さくなり、従来の均圧運転および排圧運転時間を短縮でき、省エネルギーとなる。
燃焼運転時の熱風炉内圧力を高めるための具体的な構成として、特許文献１の熱風炉装置では、燃焼運転に用いるＢＦＧを高炉のＢＦＧ回収ラインから取り出す位置を、炉頂圧回収タービン発電設備（ＴＲＴ）よりも上流側の高圧部分としている。 By the way, in the hot air furnace device of Patent Document 1, some improvements are achieved by increasing the pressures of the fuel gas and the air supplied during the combustion operation.
That is, by increasing the pressure inside the hot air furnace during the combustion operation to a level higher than that of the conventional atmospheric pressure, the volume of the combustion gas can be reduced and the furnace body and equipment can be miniaturized. In addition, by making the pressure inside the hot air furnace during the combustion operation close to the pressure inside the hot air furnace during the blowing operation, the pressure difference between them becomes smaller, and the conventional pressure equalization operation and exhaust pressure operation time can be shortened, resulting in energy saving. Become.
As a specific configuration for increasing the pressure inside the hot blast furnace during combustion operation, in the hot blast furnace device of Patent Document 1, the position where the BFG used for the combustion operation is taken out from the BFG recovery line of the blast furnace is set at the top pressure recovery turbine power generation facility. It is a high-pressure part on the upstream side of (TRT).

特開昭５９−１４３００８号公報JP-A-59-143008

前述のように、特許文献１の熱風炉装置では、燃焼運転に用いるＢＦＧを、高炉のＢＦＧ回収ラインのＴＲＴよりも上流側の高圧部分から取り出すことで、燃焼運転時の熱風炉内圧力を高めている。
しかし、高炉のＢＦＧ回収ラインのＴＲＴよりも上流側から取り出したＢＦＧであっても、その圧力（例えば２８０ＫＰａ）は、燃焼運転時の熱風炉内圧力を送風運転時の熱風炉内圧力（例えば５００ＫＰａ）にまで高める程度に十分ではなく、均圧運転および排圧運転を解消するまでには至っていない。つまり、特許文献１においては、均圧運転および排圧運転で調整する圧力差が小さくできたとしても、各々の作業自体は解消することができず、作業効率の削減、運転効率の向上に繋がらないという問題があった。 As described above, in the hot air furnace device of Patent Document 1, the BFG used for the combustion operation is taken out from the high pressure portion on the upstream side of the TRT of the BFG recovery line of the blast furnace to increase the pressure inside the hot air furnace during the combustion operation. ing.
However, even if the BFG is taken out from the upstream side of the TRT of the BFG recovery line of the blast furnace, its pressure (for example, 280 KPa) is the pressure inside the hot blast furnace during the combustion operation and the pressure inside the hot blast furnace during the blast operation (for example, 500 KPa). ) Is not enough, and the pressure equalizing operation and the exhaust pressure operation have not been eliminated. That is, in Patent Document 1, even if the pressure difference adjusted in the pressure equalizing operation and the exhaust pressure operation can be reduced, each work itself cannot be eliminated, which leads to reduction of work efficiency and improvement of operation efficiency. There was a problem that there was no.

また、特許文献１のように、高炉のＢＦＧ回収ラインのＴＲＴよりも上流側から取り出されたＢＦＧには、次のような問題がある。
ＢＦＧ回収ラインの高炉に近い部分であるため、高炉の炉頂圧力の変動の影響を受け易く、ＢＦＧの圧力が安定しないため、熱風炉における燃焼運転の安定性が低下する。
さらに、高圧であることからＢＦＧ中に含まれる水分量が多く、熱風炉に導入された際にミストになって耐火煉瓦を劣化させる原因になる。 Further, as in Patent Document 1, the BFG taken out from the upstream side of the TRT of the BFG recovery line of the blast furnace has the following problems.
Since the part of the BFG recovery line is close to the blast furnace, it is easily affected by fluctuations in the top pressure of the blast furnace, and the pressure of the BFG is not stable, so that the stability of the combustion operation in the hot blast furnace is lowered.
Further, since the pressure is high, the amount of water contained in the BFG is large, and when it is introduced into a hot air furnace, it becomes mist and causes deterioration of refractory bricks.

本発明の目的は、燃焼運転時の熱風炉内圧力を十分に高圧化できる熱風炉装置および熱風炉運転方法を提供することにある。 An object of the present invention is to provide a hot blast furnace device and a hot blast furnace operating method capable of sufficiently increasing the pressure inside the hot blast furnace during combustion operation.

本発明の熱風炉装置は、高炉に熱風を送風する送風運転および熱風炉内で燃料ガスを燃焼させる燃焼運転を行う熱風炉と、前記高炉の炉頂ガスを前記燃料ガスとして前記熱風炉に供給する燃料ガス供給ラインと、前記燃料ガス供給ラインに設置されて前記燃料ガスを昇圧する昇圧機とを有することを特徴とする。 The hot blast furnace device of the present invention supplies a hot blast furnace that blows hot air to the blast furnace and a combustion operation that burns fuel gas in the hot blast furnace, and the top gas of the blast furnace as the fuel gas to the hot blast furnace. It is characterized by having a fuel gas supply line to be used and a booster installed in the fuel gas supply line to boost the fuel gas.

本発明の熱風炉運転方法は、高炉に熱風を送風する送風運転および熱風炉内で燃料ガスを燃焼させる燃焼運転を行う熱風炉の運転方法であって、前記高炉の炉頂ガスを前記燃料ガスとして前記熱風炉に供給するとともに、前記熱風炉に供給される前記燃料ガスを昇圧機で昇圧することを特徴とする。 The hot blast furnace operating method of the present invention is a hot blast furnace operating method in which hot air is blown to the blast furnace and combustion operation is performed to burn fuel gas in the hot blast furnace, and the top gas of the blast furnace is used as the fuel gas. The fuel gas supplied to the hot air furnace is boosted by a booster while being supplied to the hot air furnace.

本発明では、熱風炉に供給される燃料ガスを、昇圧機で昇圧することで十分な高圧にすることができる。
このため、熱風炉においては、燃焼運転時の熱風炉内圧力を送風運転時の熱風炉内圧力まで十分に高圧化することができ、燃焼運転時と送風運転時の熱風炉内圧力の差がなくなることで、均圧運転および排圧運転が必要なくなり、各々の作業を解消することができる。 In the present invention, the fuel gas supplied to the hot air furnace can be boosted to a sufficiently high pressure by boosting the pressure with a booster.
Therefore, in the hot blast furnace, the pressure inside the hot blast furnace during the combustion operation can be sufficiently increased to the pressure inside the hot blast furnace during the blast operation, and the difference between the pressure inside the hot blast furnace during the combustion operation and the blast operation is different. By eliminating the need for pressure equalization operation and exhaust pressure operation, each work can be eliminated.

熱風炉の運転において均圧運転および排圧運転が全解消できることで、各々の作業工程を削減でき、作業効率および作業コストを低減できる。また、熱風炉の運転において、均圧運転および排圧運転が占めていた期間を解消でき、運転効率を向上することができる。さらに、熱風炉基数の削減も可能である。加えて、従来の排圧運転時には、熱風炉内に残留していたＢＦＧから、熱風炉内圧力の低下に伴って結露が発生していたが、排圧運転の解消により、このような熱風炉内の結露も防止することができる。 Since the pressure equalizing operation and the exhaust pressure operation can be completely eliminated in the operation of the hot air furnace, each work process can be reduced, and the work efficiency and work cost can be reduced. Further, in the operation of the hot air furnace, the period occupied by the pressure equalizing operation and the exhaust pressure operation can be eliminated, and the operation efficiency can be improved. Furthermore, it is possible to reduce the number of hot air furnaces. In addition, during the conventional exhaust pressure operation, dew condensation was generated from the BFG remaining in the hot air furnace as the pressure inside the hot air furnace decreased. Condensation inside can also be prevented.

さらに、本発明では、熱風炉に導入される燃料ガスを、昇圧機により断熱圧縮することで昇温させることができる。これにより、従来の燃料ガスの予熱装置や、従来の補助燃料ガスの供給も解消でき、設備および運転コストの抑制ができる。 Further, in the present invention, the fuel gas introduced into the hot air furnace can be heated by adiabatic compression by a booster. As a result, the conventional fuel gas preheating device and the conventional auxiliary fuel gas supply can be eliminated, and the equipment and operating costs can be suppressed.

本発明において、燃焼運転時の熱風炉内圧力を高めることで、燃焼運転の時間も短縮できる。従来は、一般に送風運転に対して燃焼運転の時間が長く設定され、かつ前述した均圧運転および排圧運転が必要であった。しかし、本発明では、均圧運転および排圧運転が解消できるとともに、燃焼運転時間を短縮して送風運転と同程度の時間とすることもでき、燃焼運転と送風運転とが繰り返す簡素な運転スケジュールの設定も可能となる。 In the present invention, the time of the combustion operation can be shortened by increasing the pressure in the hot air furnace during the combustion operation. Conventionally, the combustion operation time is generally set longer than that of the blower operation, and the above-mentioned pressure equalization operation and exhaust pressure operation are required. However, in the present invention, the pressure equalizing operation and the exhaust pressure operation can be eliminated, and the combustion operation time can be shortened to the same time as the blast operation, and a simple operation schedule in which the combustion operation and the blast operation are repeated can be eliminated. Can also be set.

上述した作用効果に加え、本発明では、前述した特許文献１における燃料ガスの高圧化による作用効果についても得ることができる。
すなわち、送風運転時の熱風炉内圧力と燃焼運転時の熱風炉内圧力との差が減少し、均圧運転および排圧運転における圧力変動が解消されるため、熱風炉各部の寿命を延長することができる。例えば、鉄皮の疲労破壊の防止、熱風炉内の耐火煉瓦の割れや、煉瓦目地の開きを防止することができ、目地からの熱風炉内ガスの吹き抜けといった問題も解消することができる。
さらに、燃焼運転時の熱風炉内圧力の高圧化により、燃料ガスの体積を抑制でき、熱風炉内断面積を抑制でき、燃焼運転時の燃焼効率も向上でき、炉体および設備を小型化することができる。 In addition to the above-mentioned action and effect, in the present invention, the above-mentioned action and effect by increasing the pressure of the fuel gas in Patent Document 1 can also be obtained.
That is, the difference between the pressure inside the hot blast furnace during the blowing operation and the pressure inside the hot blast furnace during the combustion operation is reduced, and the pressure fluctuations during the pressure equalization operation and the exhaust pressure operation are eliminated, so that the life of each part of the hot blast furnace is extended. be able to. For example, it is possible to prevent fatigue destruction of the iron skin, cracking of refractory bricks in the hot air furnace, opening of brick joints, and solving problems such as blow-by of gas in the hot air furnace from the joints.
Furthermore, by increasing the pressure inside the hot air furnace during combustion operation, the volume of fuel gas can be suppressed, the cross-sectional area inside the hot air furnace can be suppressed, the combustion efficiency during combustion operation can be improved, and the furnace body and equipment can be miniaturized. be able to.

本発明の熱風炉装置において、前記燃料ガス供給ラインは、前記高炉の炉頂から前記炉頂ガスを取り出す炉頂ガス回収ラインの炉頂圧回収設備よりも下流側から前記炉頂ガスを取り出すことが好ましい。 In the hot blast furnace apparatus of the present invention, the fuel gas supply line takes out the top gas from the downstream side of the top pressure recovery facility of the top gas recovery line that takes out the top gas from the top of the blast furnace. Is preferable.

本発明の熱風炉運転方法において、前記燃料ガスとして、前記高炉の炉頂から取り出されて炉頂圧回収設備で圧力回収された前記炉頂ガスを用いることが好ましい。 In the hot blast furnace operating method of the present invention, it is preferable to use the top gas taken out from the top of the blast furnace and recovered in pressure by the top pressure recovery facility as the fuel gas.

本発明では、燃料ガスとして用いる炉頂ガスが、炉頂圧回収設備で圧力回収された後であるため、高炉の炉頂圧力の変動の影響は炉頂圧回収設備で緩和され、燃料ガスにおける圧力変動を安定化することができる。
本発明では、燃料ガスとして用いる炉頂ガスが、炉頂圧回収設備で圧力回収されて低圧の状態であるため、炉頂ガス中の水分量を低い状態とすることができ、燃料ガスとして導入された際に熱風炉内のミスト発生による耐火煉瓦の劣化などを防止することができる。
本発明では、昇圧機による昇圧ができるため、このような低圧の炉頂ガスを用いても、熱風炉に導入される燃料ガスを十分な高圧とすることができる。 In the present invention, since the top gas used as the fuel gas is pressure-recovered by the top pressure recovery facility, the influence of the fluctuation of the top pressure of the blast furnace is mitigated by the top pressure recovery facility, and the fuel gas is affected. The pressure fluctuation can be stabilized.
In the present invention, since the furnace top gas used as the fuel gas is pressure-recovered by the furnace top pressure recovery facility and is in a low pressure state, the water content in the furnace top gas can be kept low and introduced as a fuel gas. It is possible to prevent the refractory bricks from deteriorating due to the generation of mist in the hot air furnace.
In the present invention, since the pressure can be increased by the booster, the fuel gas introduced into the hot air furnace can be made sufficiently high pressure even if such a low pressure furnace top gas is used.

本発明の熱風炉装置において、前記燃焼運転時の前記熱風炉の排ガスから排圧および排熱を回収する排熱回収設備を有し、前記昇圧機は前記排熱回収設備で回収した排圧および排熱を動力に用いることが好ましい。 The hot air furnace device of the present invention has an exhaust heat recovery facility for recovering exhaust pressure and exhaust heat from the exhaust gas of the hot air furnace during the combustion operation, and the booster has exhaust pressure and exhaust heat recovered by the exhaust heat recovery facility. It is preferable to use waste heat as power.

本発明の熱風炉運転方法において、前記燃焼運転時の前記熱風炉の排ガスから排圧および排熱を回収し、回収した排圧および排熱を前記昇圧機の動力に用いることが好ましい。 In the hot air furnace operating method of the present invention, it is preferable to recover the exhaust pressure and the exhaust heat from the exhaust gas of the hot air furnace during the combustion operation, and use the recovered exhaust pressure and the exhaust heat for the power of the booster.

本発明では、昇圧機の動力を、熱風炉の燃焼運転時の排ガスから回収した排圧および排熱でまかなうことができ、運転コストを抑制することができる。本発明における昇圧機の効果は、前述した通りであるが、その動力についても熱風炉の燃焼運転時の排エネルギーを利用することで、本発明の実施に必要なコストを最小限にすることができる。 In the present invention, the power of the booster can be supplied by the exhaust pressure and the exhaust heat recovered from the exhaust gas during the combustion operation of the hot air furnace, and the operating cost can be suppressed. The effect of the booster in the present invention is as described above, but the cost required for carrying out the present invention can be minimized by utilizing the exhaust energy during the combustion operation of the hot air furnace for its power. can.

本発明の熱風炉運転方法において、前記送風運転と、前記熱風炉を前記送風運転から前記燃焼運転に切り替える燃焼切替作業と、前記燃焼運転と、前記熱風炉を前記燃焼運転から前記送風運転に切り替える送風切替作業と、を繰り返すとともに、前記燃焼切替作業、前記燃焼運転および前記送風切替作業の合計時間を、前記送風運転を行う時間以下とすることが好ましい。 In the hot blast furnace operation method of the present invention, the blast operation, the combustion switching operation of switching the hot blast furnace from the blast operation to the combustion operation, the combustion operation, and switching the hot blast furnace from the combustion operation to the blast operation. It is preferable that the blast switching work is repeated and the total time of the combustion switching work, the combustion operation and the blast switching work is set to be equal to or less than the time for performing the blast operation.

本発明では、例えば熱風炉２本運転を行う場合、２本の熱風炉を交互に、一方を送風運転とし、その間に他方で燃焼切替作業、燃焼運転および送風切替作業を実行することができる。
本発明では、燃焼切替作業および送風切替作業に圧力調整（均圧および排圧）を含まないので、燃焼切替作業および送風切替作業は燃焼ガスあるいは送風用の空気の切り替えだけでよく、ごく短時間で実行することができる。
そして、本発明では、燃焼運転が高圧で行われるため、送風運転と同程度の時間で十分な蓄熱が得られる。 In the present invention, for example, when two hot blast furnaces are operated, the two hot blast furnaces can be alternately operated, one of which is a blast operation, and the other of which is capable of performing combustion switching operation, combustion operation, and blast switching operation.
In the present invention, since the combustion switching work and the blower switching work do not include pressure adjustment (pressure equalization and exhaust pressure), the combustion switching work and the blower switching work need only be switched between the combustion gas and the air for blowing, and the time is very short. Can be executed with.
Further, in the present invention, since the combustion operation is performed at a high pressure, sufficient heat storage can be obtained in the same time as the ventilation operation.

その結果、２本の熱風炉の一方が送風運転する間に、他方を前後に燃焼切替作業および送風切替作業を伴う燃焼運転とすることができ、２本の熱風炉で従来の３本熱風炉運転と同条件の送風運転させることができる。この際、送風運転は、２本の熱風炉で交互に行われるので、高炉に対する送風が途切れることはない。
なお、偶数本の熱風炉を有する熱風炉装置であれば、２本ずつの熱風炉に対して本発明を適用することができる。 As a result, while one of the two hot blast furnaces is in the blast operation, the other can be in the combustion operation with the combustion switching work and the blast switching work in the front-rear direction. It can be operated by blowing air under the same conditions as the operation. At this time, since the blast operation is alternately performed by the two hot blast furnaces, the blast furnace is not interrupted.
The present invention can be applied to two hot blast furnaces as long as it is a hot blast furnace apparatus having an even number of hot blast furnaces.

本発明の熱風炉運転方法において、前記送風運転と、前記熱風炉を前記送風運転から前記燃焼運転に切り替える燃焼切替作業と、前記燃焼運転と、前記熱風炉を前記燃焼運転から前記送風運転に切り替える送風切替作業と、を繰り返すとともに、前記燃焼切替作業、前記燃焼運転および前記送風切替作業の合計時間を、前記送風運転を行う時間の２倍以下とすることが好ましい。 In the hot blast furnace operation method of the present invention, the blast operation, the combustion switching operation of switching the hot blast furnace from the blast operation to the combustion operation, the combustion operation, and switching the hot blast furnace from the combustion operation to the blast operation. It is preferable that the blast switching work is repeated and the total time of the combustion switching work, the combustion operation and the blast switching work is twice or less the time for performing the blast operation.

本発明では、例えば熱風炉３本運転を行う場合、３本の熱風炉のうち１本を送風運転とし、その間に他の２本で燃焼切替作業、燃焼運転および送風切替作業を実行することができる。
すなわち、送風運転していた熱風炉を燃焼運転に切り換えて２本目の熱風炉で送風運転を行い、所定の送風運転時間が経過したら２本目の熱風炉を送風運転から燃焼運転に切り換えて３本目の熱風炉で送風運転を行う。このとき、１本目の熱風炉は燃焼運転の半分が経過した状態であり、所定の送風運転時間が経過したら３本目の熱風炉を送風運転から燃焼運転に切り換えるとともに、１本目の熱風炉で送風運転を行う。
その結果、３本の熱風炉のうち１本が送風運転する間に、他の２本を前後に燃焼切替作業および送風切替作業を伴う燃焼運転とすることができ、３本の熱風炉を効率的に運転させることができる。この際、送風運転は、３本の熱風炉のいずれかで交互に行われるので、高炉に対する送風が途切れることはない。
さらに、本発明では、送風運転に対して燃焼運転がほぼ２倍の時間となるため、送風運転の時間を短くして蓄熱温度の低下を小さくすることができる。また、燃焼が行われる燃焼室のサイズを小さくすることもできる。 In the present invention, for example, when three hot air furnaces are operated, one of the three hot air furnaces is set to blow air, and the other two perform combustion switching work, combustion operation, and blow air switching work in the meantime. can.
That is, the hot blast furnace that had been in the blast operation is switched to the combustion operation and the blast operation is performed in the second hot blast furnace. Blow operation is performed in the hot air furnace of. At this time, half of the combustion operation of the first hot blast furnace has passed, and when the predetermined blasting operation time has elapsed, the third hot blast furnace is switched from the blasting operation to the combustion operation, and the first hot blast furnace blows air. Drive.
As a result, while one of the three hot blast furnaces is in the blast operation, the other two can be in the combustion operation with the combustion switching work and the blast switching work back and forth, and the three hot blast furnaces can be efficiently operated. Can be operated as a target. At this time, since the blast operation is alternately performed in any of the three hot blast furnaces, the blast furnace is not interrupted.
Further, in the present invention, since the combustion operation takes almost twice as long as the blower operation, the blower operation time can be shortened to reduce the decrease in the heat storage temperature. It is also possible to reduce the size of the combustion chamber in which combustion takes place.

なお、３の倍数本の熱風炉を有する熱風炉装置であれば、３本ずつの熱風炉に対して本発明を適用することができる。
また、熱風炉３本運転の場合で、１本で燃焼運転を実行する間に、２本で送風運転を行うとしてもよく、送風運転を行う２本の熱風炉については、先ず１本目の熱風炉だけで送風運転を行い、１本目の送風運転が半分経過した段階で２本目の熱風炉が送風運転を開始することで、高炉への送風温度を前述した熱風炉２本ないし偶数本の交互運転に比べ高くできる。 The present invention can be applied to three hot blast furnaces as long as it is a hot blast furnace apparatus having three hot blast furnaces.
Further, in the case of the operation of three hot blast furnaces, the blast operation may be performed by two while the combustion operation is performed by one. For the two blast furnaces that perform the blast operation, first, the first hot air The blast operation is performed only by the furnace, and when the first blast operation has passed halfway, the second hot blast furnace starts the blast operation, so that the blast temperature to the blast furnace is alternately set to the above-mentioned two or even number of hot blast furnaces. It can be higher than driving.

本発明によれば、燃焼運転時の熱風炉内圧力を十分に高圧化できる熱風炉装置および熱風炉運転方法を提供することができる。 According to the present invention, it is possible to provide a hot blast furnace device and a hot blast furnace operating method capable of sufficiently increasing the pressure inside the hot blast furnace during combustion operation.

本発明の熱風炉装置の一実施形態を示す模式図。The schematic diagram which shows one Embodiment of the hot air furnace apparatus of this invention. 前記実施形態での送風運転および燃焼運転を示す模式図。The schematic diagram which shows the blowing operation and combustion operation in the said embodiment. 従来の送風運転および燃焼運転を示す模式図。The schematic diagram which shows the conventional blowing operation and combustion operation. 前記実施形態での他の送風運転および燃焼運転を示す模式図。The schematic diagram which shows the other blowing operation and combustion operation in the said embodiment.

図１において、熱風炉装置１は、高炉２に熱風を供給するものである。
高炉２には、炉頂２１に装入装置２２が設置され、鉄鉱石およびコークスを主体とする装入物が挿入される。高炉２には、複数の羽口２３が炉体の周方向に配列され、各々には環状管２４を介して熱風炉装置１が接続されている。
熱風炉装置１から熱風が供給されると、熱風は環状管２４で分配されて羽口２３から高炉内へ均等に吹き込まれる。高炉内に吹き込まれた熱風は、装入物を加熱して鉄分の還元反応に寄与したのち、炉頂ガス（ＢＦＧ）として炉頂２１から取り出される。 In FIG. 1, the hot air furnace device 1 supplies hot air to the blast furnace 2.
In the blast furnace 2, a charging device 22 is installed at the top 21 of the furnace, and charged materials mainly composed of iron ore and coke are inserted. A plurality of tuyere 23 are arranged in the circumferential direction of the furnace body in the blast furnace 2, and a hot air furnace device 1 is connected to each of them via an annular pipe 24.
When hot air is supplied from the hot air furnace device 1, the hot air is distributed by the annular pipe 24 and evenly blown into the blast furnace from the tuyere 23. The hot air blown into the blast furnace heats the charge and contributes to the iron reduction reaction, and then is taken out from the furnace top 21 as the furnace top gas (BFG).

高炉２には、炉頂ガスを回収する炉頂ガス回収ライン３が接続されている。
炉頂ガス回収ライン３は、炉頂２１に接続された炉頂配管３１によりＢＦＧを取り出し、ダストキャッチャ３２、第１ベンチュリスクラバ３３、第２ベンチュリスクラバ３４を順次通過させることでＢＦＧを除塵する。
除塵されたＢＦＧは、炉頂圧回収設備３５（ＴＲＴ）により圧力および熱などの残留エネルギーを回収され、電力などに変換して再利用される。
エネルギー回収されたＢＦＧは、ガスホルダ３６に貯蔵され、他の設備の燃料などに利用される。 A top gas recovery line 3 for recovering top gas is connected to the blast furnace 2.
The furnace top gas recovery line 3 takes out the BFG through the furnace top pipe 31 connected to the furnace top 21, and removes the BFG by sequentially passing through the dust catcher 32, the first Venturi scrubber 33, and the second Venturi scrubber 34.
The dust-removed BFG is recovered from residual energy such as pressure and heat by the furnace top pressure recovery facility 35 (TRT), converted into electric power, and reused.
The energy-recovered BFG is stored in the gas holder 36 and used as fuel for other equipment.

熱風炉装置１は、３本の熱風炉４（４Ａ〜４Ｃ）を備えている。熱風炉４Ａ〜４Ｃは、それぞれ蓄熱室４１および燃焼室４２を有する外燃式である。
蓄熱室４１は、内部に蓄熱用のチェッカー煉瓦が積まれ、炉頂部が燃焼室４２と連通されるとともに、炉底部に送風本管４３および煙道本管４４が接続されている。
燃焼室４２は、中間部に環状管２４に至る熱風本管４５が接続され、炉底のバーナ部分に空気供給管４６および燃料ガス供給管４７が接続されている。
熱風炉４Ａ〜４Ｃは、それぞれ送風本管４３、煙道本管４４および熱風本管４５との接続部分に図示しない開閉弁を有し、動作状態に応じて各々との接続が断続される。 The hot air furnace device 1 includes three hot air furnaces 4 (4A to 4C). The hot air furnaces 4A to 4C are external combustion type having a heat storage chamber 41 and a combustion chamber 42, respectively.
The heat storage chamber 41 is loaded with checker bricks for heat storage, the top of the furnace is communicated with the combustion chamber 42, and the blower main 43 and the flue main 44 are connected to the bottom of the furnace.
In the combustion chamber 42, the hot air main pipe 45 leading to the annular pipe 24 is connected to the intermediate portion, and the air supply pipe 46 and the fuel gas supply pipe 47 are connected to the burner portion of the furnace bottom.
The hot air furnaces 4A to 4C each have an on-off valve (not shown) at a connection portion with the blower main 43, the flue main main 44, and the hot air main 45, and the connection with each is interrupted according to the operating state.

熱風炉４Ａ〜４Ｃにおいては、それぞれ高炉２に熱風を供給する送風運転と、蓄熱するための蓄熱運転とが交互に行われる。
送風運転時には、送風本管４３から空気が導入され、蓄熱室４１を通る間に加熱されて熱風が生成され、熱風が燃焼室４２から熱風本管４５を経て環状管２４へと供給される。
燃焼運転時には、バーナ部分で空気供給管４６からの空気および燃料ガス供給管４７からの燃料ガスによる燃焼が燃焼室４２内で行われ、高温の燃焼ガスが蓄熱室４１に通されてチェッカー煉瓦に蓄熱が行われる。蓄熱室４１を通った燃焼ガスは、煙道本管４４から排出される。
これらの送風運転および燃焼運転に関して、３本の熱風炉４Ａ〜４Ｃの相互の連携については後に詳述する。 In the hot blast furnaces 4A to 4C, the blast operation for supplying hot air to the blast furnace 2 and the heat storage operation for storing heat are alternately performed.
During the blowing operation, air is introduced from the blowing main 43, heated while passing through the heat storage chamber 41 to generate hot air, and the hot air is supplied from the combustion chamber 42 to the annular pipe 24 via the hot air main 45.
During the combustion operation, the air from the air supply pipe 46 and the fuel gas from the fuel gas supply pipe 47 are burned in the combustion chamber 42 at the burner portion, and the high temperature combustion gas is passed through the heat storage chamber 41 to the checker brick. Heat is stored. The combustion gas that has passed through the heat storage chamber 41 is discharged from the flue main 44.
Regarding these ventilation operations and combustion operations, the mutual cooperation of the three hot air furnaces 4A to 4C will be described in detail later.

送風本管４３には送風用のブロア４３１が設置され、吸入した空気を所定圧力まで昇圧して蓄熱室４１ないし熱風本管４５に送ることができる。ブロア４３１により送風運転時の蓄熱室４１および燃焼室４２の熱風炉内圧力が所定の高圧に維持され、高炉２の内部が高圧であっても羽口２３から熱風を吹き込むことができる。
煙道本管４４にはタービン発電機などの排気圧回収設備４４１が設置され、煙道本管４４を通して排出される燃焼ガスの圧力および熱などの残留エネルギーが回収される。 A blower 431 for blowing air is installed in the blowing main 43, and the sucked air can be boosted to a predetermined pressure and sent to the heat storage chamber 41 or the hot air main 45. The blower 431 maintains the pressure inside the hot air furnace of the heat storage chamber 41 and the combustion chamber 42 during the blowing operation at a predetermined high pressure, and hot air can be blown from the tuyere 23 even if the inside of the blast furnace 2 is high pressure.
Exhaust pressure recovery equipment 441 such as a turbine generator is installed in the flue main 44, and residual energy such as pressure and heat of combustion gas discharged through the flue main 44 is recovered.

空気供給管４６には空気供給用のブロア４６１が設置され、燃焼運転時に外気を燃焼室４２へと圧送することができる。
燃料ガス供給管４７は、燃料ガス供給ライン５を介して炉頂ガス回収ライン３に接続され、高炉２から回収されたＢＦＧを燃焼室４２の燃料ガスとして用いることができる。 A blower 461 for supplying air is installed in the air supply pipe 46, and outside air can be pumped to the combustion chamber 42 during the combustion operation.
The fuel gas supply pipe 47 is connected to the furnace top gas recovery line 3 via the fuel gas supply line 5, and the BFG recovered from the blast furnace 2 can be used as the fuel gas in the combustion chamber 42.

燃料ガス供給ライン５は、分岐配管５１が炉頂ガス回収ライン３の炉頂圧回収設備３５の下流側に接続され、当該部分から取り出したＢＦＧを熱風炉４に供給することができる。
燃料ガス供給ライン５の途中には、本発明の昇圧機としてのブロア５２が設置されている。燃料ガス供給ライン５を通して燃焼室４２へ送られるＢＦＧは、ブロア５２により所定圧力まで昇圧され、燃焼運転時の燃焼室４２および蓄熱室４１の熱風炉内圧力を所定の高圧に維持することができる。 In the fuel gas supply line 5, the branch pipe 51 is connected to the downstream side of the furnace top pressure recovery facility 35 of the furnace top gas recovery line 3, and the BFG taken out from the portion can be supplied to the hot air furnace 4.
A blower 52 as a booster of the present invention is installed in the middle of the fuel gas supply line 5. The BFG sent to the combustion chamber 42 through the fuel gas supply line 5 is boosted to a predetermined pressure by the blower 52, and the pressure in the hot air furnace of the combustion chamber 42 and the heat storage chamber 41 during the combustion operation can be maintained at a predetermined high pressure. ..

昇圧機としてのブロア５２は、その動力として、煙道本管４４に設置された排気圧回収設備４４１による回収エネルギーを用いる。例えば、熱風炉４Ａ〜４Ｃのいずれかで燃焼運転を行う際には、ブロア５２により燃料ガスであるＢＦＧを昇圧するが、その動力は現在燃焼運転中の熱風炉４Ａ〜４Ｃのいずれかからの回収エネルギーとすることができる。 The blower 52 as a booster uses the energy recovered by the exhaust pressure recovery equipment 441 installed in the flue main 44 as its power. For example, when the combustion operation is performed in any of the hot air furnaces 4A to 4C, the blower 52 boosts the BFG which is the fuel gas, but the power is from any of the hot air furnaces 4A to 4C currently in the combustion operation. It can be used as recovered energy.

ブロア５２により昇圧を行い、燃料ガス供給管４７から燃焼室４２へ供給される燃料ガス（ＢＦＧ）の圧力を高めた場合、燃焼バランスをとるために、空気供給管４６から燃焼室４２に供給される空気の圧力を高める必要がある。そのための昇圧は、ブロア４６１により行うことができる。なお、ブロア４６１の動力も、排気圧回収設備４４１による回収エネルギーとすることができる。また、空気供給用のブロア４６１は、送風用のブロア４３１の風量に余裕があれば、これで代用してもよい。 When the pressure is increased by the blower 52 and the pressure of the fuel gas (BFG) supplied from the fuel gas supply pipe 47 to the combustion chamber 42 is increased, the fuel gas (BFG) is supplied from the air supply pipe 46 to the combustion chamber 42 in order to balance the combustion. It is necessary to increase the pressure of the air. The boosting for that purpose can be performed by the blower 461. The power of the blower 461 can also be used as the energy recovered by the exhaust pressure recovery equipment 441. Further, the blower 461 for air supply may be substituted with the blower 461 for blowing air if the air volume of the blower 431 is sufficient.

本実施形態の熱風炉装置１においては、３本の熱風炉４Ａ〜４Ｃのうち２本を用い、各々に送風運転および燃焼運転を交互に実行させる。
図２に示すように、熱風炉４Ａ，４Ｂの２本を用いる場合、例えば基準時点０分から４５分サイクルで、送風運転および燃焼運転を交互に実行させる。 In the hot blast furnace device 1 of the present embodiment, two of the three hot blast furnaces 4A to 4C are used, and the blast operation and the combustion operation are alternately executed in each of them.
As shown in FIG. 2, when two hot air furnaces 4A and 4B are used, for example, the blowing operation and the combustion operation are alternately executed in a cycle of 0 to 45 minutes at the reference time.

熱風炉４Ａでは、基準時点０分から、送風運転を４５分行い、０．５分で送風運転から燃焼運転への切り替え（燃焼切替作業）を行い、燃焼運転を４４分行い、０．５分で燃焼運転から送風運転への切り替え（送風切替作業）を行い、以降これらの４つの工程を繰り返す。
送風運転は４５分であるから、１サイクル分となる。燃焼運転４４分と燃焼および送風の切替作業０．５分が２回で合計４５分となり、１サイクル分に相当する。 In the hot air furnace 4A, the blowing operation is performed for 45 minutes from 0 minutes at the reference time, the switching from the blowing operation to the combustion operation (combustion switching work) is performed in 0.5 minutes, the combustion operation is performed for 44 minutes, and the combustion operation is performed in 0.5 minutes. Switching from the combustion operation to the blower operation (blower switching work) is performed, and then these four steps are repeated.
Since the ventilation operation is 45 minutes, it is for one cycle. The combustion operation of 44 minutes and the combustion and ventilation switching work of 0.5 minutes are performed twice, for a total of 45 minutes, which is equivalent to one cycle.

熱風炉４Ａの熱風炉内圧力は、送風運転時には、送風本管４３のブロア４３１により送風用の空気の昇圧が行われ、所定の熱風炉内圧力が維持される。一方、燃焼運転時には、燃料ガス供給ライン５のブロア５２により燃料ガスであるＢＦＧの昇圧が行われ、送風運転時と同じ熱風炉内圧力が維持される。
燃焼切替作業および送風切替作業では、空気の流通方向の反転のために、熱風炉４Ａ〜４Ｃの送風本管４３、煙道本管４４および熱風本管４５との接続部分にそれぞれ設置される図示しない開閉弁を駆動させるための切替時間が発生する。 The pressure inside the hot blast furnace 4A is maintained at a predetermined pressure inside the hot blast furnace by boosting the air for blowing by the blower 431 of the blowing main 43 during the blowing operation. On the other hand, during the combustion operation, the blower 52 of the fuel gas supply line 5 boosts the BFG, which is the fuel gas, and maintains the same pressure in the hot air furnace as during the blower operation.
In the combustion switching work and the blower switching work, in order to reverse the air flow direction, they are installed at the connection portions with the blower main 43, the flue main 44, and the hot air main 45 of the hot air furnaces 4A to 4C, respectively. No switching time is required to drive the on-off valve.

熱風炉４Ａの熱風炉内温度は、送風運転時に、送風に伴って低下してゆく。一方、燃焼運転時には、燃焼室４２での燃焼により、徐々に上昇してゆき、送風運転の当初必要な温度が確保される。
このような短時間の燃焼運転で十分な蓄熱を行うことができるのは、昇圧機であるブロア５２により燃料ガスであるＢＦＧを昇圧し、燃焼室４２での燃焼運転を高圧で行うことに起因する。 The temperature inside the hot blast furnace 4A decreases with the blast during the blast operation. On the other hand, during the combustion operation, the temperature gradually rises due to the combustion in the combustion chamber 42, and the initially required temperature for the ventilation operation is secured.
Sufficient heat storage can be performed in such a short-time combustion operation because the BFG, which is a fuel gas, is boosted by the blower 52, which is a booster, and the combustion operation in the combustion chamber 42 is performed at high pressure. do.

以上のような熱風炉４Ａに対し、熱風炉４Ｂでは、基準時点０分から、０．５分の燃焼切替作業を行い、燃焼運転を４４分行い、０．５分の送風切替作業を行い、送風運転を４５分行い、以降これらの４つの工程を繰り返す。
熱風炉４Ｂにおいても、送風運転４５分が１サイクル分、燃焼運転４４分と燃焼切替作業０．５分および送風切替作業０．５分とで合計４５分が１サイクル分となる。
送風運転時および燃焼運転時の圧力および温度の変化は、熱風炉４Ｂにおいても熱風炉４Ａで説明した通りの挙動を示す。 In contrast to the hot air furnace 4A as described above, in the hot air furnace 4B, the combustion switching work is performed for 0.5 minutes from 0 minutes at the reference time, the combustion operation is performed for 44 minutes, the air blowing switching work is performed for 0.5 minutes, and the air is blown. The operation is performed for 45 minutes, and then these four steps are repeated.
Also in the hot air furnace 4B, 45 minutes of the blast operation is for one cycle, 44 minutes for the combustion operation, 0.5 minutes for the combustion switching work, and 0.5 minutes for the blast switching work, for a total of 45 minutes for one cycle.
The changes in pressure and temperature during the blowing operation and the combustion operation show the behavior as described in the hot air furnace 4A also in the hot air furnace 4B.

このように、本実施形態では、図２に示すように、熱風炉４Ａ，４Ｂが４５分サイクルで交互に送風運転と燃焼運転とを行うことができる。
熱風炉４Ａ，４Ｂにおいて、送風運転は４５分サイクルの全体にわたるため、高炉２への送風が途絶えることはない。一方、燃焼運転は、高圧での燃焼とすることで、４４分で所定の蓄熱を行うことができる。これにより、燃焼切替作業および送風切替作業を含めて燃焼運転を４５分サイクルに収めることができ、熱風炉４Ａ，４Ｂの２本での４５分サイクルでの送風および燃焼の交互運転を実現することができる。
図２の運転を行う際には、熱風炉４Ａ，４Ｂの組み合わせではなく、熱風炉４Ａ，４Ｃの組み合わせ、あるいは、熱風炉４Ｂ，４Ｃの組み合わせを用いてもよい。 As described above, in the present embodiment, as shown in FIG. 2, the hot air furnaces 4A and 4B can alternately perform the blowing operation and the combustion operation in a 45-minute cycle.
In the hot blast furnaces 4A and 4B, the blast operation extends over the entire 45-minute cycle, so that the blast furnace 2 is not interrupted. On the other hand, in the combustion operation, by performing combustion at a high pressure, a predetermined heat storage can be performed in 44 minutes. As a result, the combustion operation including the combustion switching work and the ventilation switching work can be contained in the 45-minute cycle, and the alternating operation of the ventilation and the combustion in the 45-minute cycle with the two hot air furnaces 4A and 4B can be realized. Can be done.
When performing the operation of FIG. 2, instead of the combination of the hot air furnaces 4A and 4B, the combination of the hot air furnaces 4A and 4C or the combination of the hot air furnaces 4B and 4C may be used.

本実施形態の熱風炉装置１においては、３本の熱風炉４Ａ〜４Ｃの３本を用いるとともに、昇圧機であるブロア５２を用いず、燃焼運転を常圧で行うことで、従来通りの送風運転および燃焼運転を行うこともできる。
図３に示すように、熱風炉４Ａ〜４Ｃの３本を用い、燃焼運転を常圧で行う場合、例えば基準時点０分から４５分サイクルで、送風運転および燃焼運転を交互に実行させる。
ただし、送風運転は４５分の１サイクルであるが、燃焼運転は昇温に時間がかかるため、２サイクル９０分を用いる。さらに、２サイクル９０分においては、燃焼運転７５分の前後には、送風運転時の高圧を燃焼運転時の常圧まで下げる排圧運転７．５分と、燃焼運転時の常圧を送風運転時の高圧まで高める均圧運転７．５分とが設定される。 In the hot air furnace device 1 of the present embodiment, three hot air furnaces 4A to 4C are used, and the combustion operation is performed at normal pressure without using the blower 52 which is a booster, so that the air is blown as before. It is also possible to perform operation and combustion operation.
As shown in FIG. 3, when the combustion operation is performed at normal pressure using three hot air furnaces 4A to 4C, the ventilation operation and the combustion operation are alternately executed, for example, in a cycle of 0 to 45 minutes at the reference time.
However, although the ventilation operation is 1/45 cycle, the combustion operation takes time to raise the temperature, so 2 cycles of 90 minutes are used. Further, in 90 minutes of the two cycle, around 75 minutes of the combustion operation, 7.5 minutes of the exhaust pressure operation for lowering the high pressure during the ventilation operation to the normal pressure during the combustion operation and 7.5 minutes for the normal pressure during the combustion operation are blown. A pressure equalizing operation of 7.5 minutes is set to increase the pressure to the current high pressure.

図３において、熱風炉４Ａ〜４Ｃの各々では、前述した送風運転４５分（１サイクル分）に続いて、排圧運転７．５分、燃焼運転７５分および均圧運転７．５分の計９０分（２サイクル分）が実行され、以降これらの工程が繰り返される。
この際、熱風炉４Ａ〜４Ｃの各々では、互いに１サイクル分ずつ工程がずらされ、高炉２への熱風の供給が途絶えることがない。すなわち、熱風炉４Ａの送風運転に続いて熱風炉４Ｂの送風運転が行われ、さらに熱風炉４Ｃの送風運転が続き、再び熱風炉４Ａの送風運転が行われ、このような繰り返しにより常にいずれかの熱風炉４Ａ〜４Ｃが送風運転を行っている。 In FIG. 3, in each of the hot air furnaces 4A to 4C, following the above-mentioned blowing operation of 45 minutes (for one cycle), the exhaust pressure operation is 7.5 minutes, the combustion operation is 75 minutes, and the pressure equalizing operation is 7.5 minutes. 90 minutes (2 cycles) are executed, and these steps are repeated thereafter.
At this time, in each of the hot air furnaces 4A to 4C, the steps are shifted by one cycle from each other, and the supply of hot air to the blast furnace 2 is not interrupted. That is, the blowing operation of the hot air furnace 4A is followed by the blowing operation of the hot air furnace 4B, the blowing operation of the hot air furnace 4C is continued, and the blowing operation of the hot air furnace 4A is performed again. Hot air furnaces 4A to 4C are operating to blow air.

このように、図３に示す従来通りの送風運転および燃焼運転では、熱風炉４Ａ〜４Ｃが常圧での燃焼運転を行うため、所期の蓄熱を確保するためには燃焼運転に時間が必要であり、熱風炉４Ａ〜４Ｃの３本運用が必須となる。また、燃焼運転と送風運転との熱風炉内圧力の差を確保するために均圧運転および排圧運転が必要であり、運転作業の繁雑さが避けられない。 As described above, in the conventional ventilation operation and combustion operation shown in FIG. 3, since the hot air furnaces 4A to 4C perform the combustion operation at normal pressure, it takes time for the combustion operation to secure the desired heat storage. Therefore, it is essential to operate three hot air furnaces 4A to 4C. In addition, pressure equalization operation and exhaust pressure operation are required to secure the difference in pressure in the hot air furnace between the combustion operation and the blower operation, and the complexity of the operation work is unavoidable.

以上に説明した通り、本実施形態の熱風炉装置１によれば、とくに図２のような運転を行うことで、以下の効果を得ることができる。
本実施形態では、熱風炉４（４Ａ〜４Ｃ）に供給される燃料ガス（ＢＦＧ）を、昇圧機であるブロア５２で昇圧することで、十分な高圧にすることができる。
このため、熱風炉４においては、燃焼運転時の熱風炉内圧力を送風運転時の熱風炉内圧力まで十分に高圧化することができ（図２参照）、燃焼運転時と送風運転時の熱風炉内圧力の差がなくなることで、均圧運転および排圧運転（図３参照）が必要なくなり、各々の作業を解消することができる。 As described above, according to the hot air furnace device 1 of the present embodiment, the following effects can be obtained particularly by performing the operation as shown in FIG.
In the present embodiment, the fuel gas (BFG) supplied to the hot air furnaces 4 (4A to 4C) can be boosted by a blower 52, which is a booster, to obtain a sufficiently high pressure.
Therefore, in the hot air furnace 4, the pressure inside the hot air furnace during the combustion operation can be sufficiently increased to the pressure inside the hot air furnace during the blowing operation (see FIG. 2), and the hot air during the combustion operation and the blowing operation can be sufficiently increased. By eliminating the difference in the pressure inside the furnace, the pressure equalizing operation and the exhaust pressure operation (see FIG. 3) are not required, and each operation can be eliminated.

本実施形態では、熱風炉４の送風運転および燃焼運転を図２のように行うことで、図３のような均圧運転および排圧運転が全解消することができ、各々の作業工程を削減でき、作業効率および作業コストを低減できる。
また、図２に示す熱風炉４の運転によれば、図３の均圧運転および排圧運転が占めていた期間を解消でき、運転効率を向上することができる。
さらに、図２に示す熱風炉４の運転は、熱風炉４Ａ〜４Ｃのうち２本を用いればよく、１本を休止させ、あるいは保守点検に当てることもできる。
図２のような運転のみを行うのであれば、熱風炉装置１に設置する熱風炉４は２本だけでもよく、基数の削減も可能である。 In the present embodiment, by performing the blowing operation and the combustion operation of the hot air furnace 4 as shown in FIG. 2, the pressure equalizing operation and the exhaust pressure operation as shown in FIG. 3 can be completely eliminated, and the respective work processes are reduced. It is possible to reduce work efficiency and work cost.
Further, according to the operation of the hot air furnace 4 shown in FIG. 2, the period occupied by the pressure equalizing operation and the exhaust pressure operation in FIG. 3 can be eliminated, and the operating efficiency can be improved.
Further, for the operation of the hot air furnace 4 shown in FIG. 2, two of the hot air furnaces 4A to 4C may be used, and one of them may be suspended or used for maintenance and inspection.
If only the operation as shown in FIG. 2 is performed, only two hot air furnaces 4 are installed in the hot air furnace device 1, and the number of units can be reduced.

図３に示す従来通りの運転を行う場合、均圧運転時に熱風炉４の内部に残留していたＢＦＧから、熱風炉内圧力の上昇に伴って結露が発生していた。しかし、図２の運転を行うのであれば、均圧運転の解消により、このような熱風炉内の結露も防止することができる。 When the conventional operation shown in FIG. 3 was performed, dew condensation was generated from the BFG remaining inside the hot air furnace 4 during the pressure equalization operation as the pressure inside the hot air furnace increased. However, if the operation shown in FIG. 2 is performed, such dew condensation in the hot air furnace can be prevented by eliminating the pressure equalizing operation.

さらに、本実施形態では、熱風炉４に導入される燃料ガスを、本発明の昇圧機であるブロア５２、および、空気を昇圧する空気供給用のブロア４６１より、それぞれ断熱圧縮することで昇温させることができる。これにより、従来の熱風炉装置で用いられていた燃料ガスの予熱装置や、従来の補助燃料ガスの供給も解消でき、設備および運転コストの抑制ができる。 Further, in the present embodiment, the fuel gas introduced into the hot air furnace 4 is heated by adiabatic compression from the blower 52 which is the booster of the present invention and the blower 461 for air supply which boosts the air. Can be made to. As a result, the supply of the fuel gas preheating device and the conventional auxiliary fuel gas used in the conventional hot air furnace device can be eliminated, and the equipment and operating costs can be suppressed.

本実施形態においては、図２の説明で述べた通り、燃焼運転時の熱風炉内圧力を高めることで、燃焼運転の時間も短縮できる。従来は、一般に送風運転に対して燃焼運転の時間が長く設定され、かつ前述した均圧運転および排圧運転が必要であった。しかし、本実施形態では、均圧運転および排圧運転が解消できるとともに、燃焼運転を短縮して送風運転と同程度の時間とすることもでき、燃焼運転と送風運転とが繰り返す簡素な運転スケジュールの設定も可能となる。 In the present embodiment, as described in the explanation of FIG. 2, the time of the combustion operation can be shortened by increasing the pressure in the hot air furnace during the combustion operation. Conventionally, the combustion operation time is generally set longer than that of the blower operation, and the above-mentioned pressure equalization operation and exhaust pressure operation are required. However, in the present embodiment, the pressure equalizing operation and the exhaust pressure operation can be eliminated, and the combustion operation can be shortened to the same time as the blower operation, and the combustion operation and the blower operation are repeated in a simple operation schedule. Can also be set.

さらに、本実施形態においては、送風運転時の熱風炉内圧力と燃焼運転時の熱風炉内圧力との差をなくすことができ、均圧運転および排圧運転における圧力変動（図３参照）が解消されるため、熱風炉４の各部の寿命を延長することができる。例えば、鉄皮の疲労破壊の防止、熱風炉内の耐火煉瓦の割れや、煉瓦目地の開きを防止することができ、目地からの熱風炉内ガスの吹き抜けといった問題も解消することができる。
さらに、燃焼運転時の熱風炉内圧力の高圧化により、燃料ガスの体積を抑制でき、熱風炉内断面積を抑制でき、燃焼運転時の燃焼効率も向上でき、炉体および設備を小型化することができる。 Further, in the present embodiment, it is possible to eliminate the difference between the pressure in the hot air furnace during the blowing operation and the pressure in the hot air furnace during the combustion operation, and the pressure fluctuation in the pressure equalizing operation and the exhaust pressure operation (see FIG. 3). Since this is eliminated, the life of each part of the hot air furnace 4 can be extended. For example, it is possible to prevent fatigue destruction of the iron skin, cracking of refractory bricks in the hot air furnace, opening of brick joints, and solving problems such as blow-by of gas in the hot air furnace from the joints.
Furthermore, by increasing the pressure inside the hot air furnace during combustion operation, the volume of fuel gas can be suppressed, the cross-sectional area inside the hot air furnace can be suppressed, the combustion efficiency during combustion operation can be improved, and the furnace body and equipment can be miniaturized. be able to.

本実施形態では、熱風炉４に燃料ガスとして炉頂ガス回収ライン３に回収された高炉２の炉頂２１からの炉頂ガス（ＢＦＧ）を用いるとともに、燃料ガス供給ライン５は、分岐配管５１により、炉頂ガス回収ライン３の炉頂圧回収設備３５よりも下流側からＢＦＧを取り出すようにした。
このため、燃料ガスとして用いるＢＦＧが、炉頂圧回収設備３５で圧力回収された後のものになり、高炉２の炉頂２１の圧力変動の影響は炉頂圧回収設備３５で緩和され、熱風炉４のバーナ部分に供給されるＢＦＧにおける圧力変動を安定化することができる。
さらに、燃料ガスとして用いるＢＦＧが、炉頂圧回収設備３５で圧力回収されて低圧の状態であるため、ＢＦＧ中の水分量を低い状態とすることができ、熱風炉４のバーナ部分に導入された際に、熱風炉４の内部でミスト発生による耐火煉瓦の劣化などを防止することができる。 In the present embodiment, the top gas (BFG) from the top 21 of the blast furnace 2 recovered in the top gas recovery line 3 is used as the fuel gas in the hot air furnace 4, and the fuel gas supply line 5 is the branch pipe 51. Therefore, the BFG was taken out from the downstream side of the furnace top pressure recovery facility 35 of the furnace top gas recovery line 3.
Therefore, the BFG used as the fuel gas is after the pressure is recovered by the furnace top pressure recovery facility 35, and the influence of the pressure fluctuation of the furnace top 21 of the blast furnace 2 is mitigated by the furnace top pressure recovery facility 35, and hot air is used. It is possible to stabilize the pressure fluctuation in the BFG supplied to the burner portion of the furnace 4.
Further, since the BFG used as the fuel gas is pressure-recovered by the furnace top pressure recovery facility 35 and is in a low pressure state, the water content in the BFG can be kept low, and the BFG is introduced into the burner portion of the hot air furnace 4. At that time, deterioration of refractory bricks due to mist generation inside the hot air furnace 4 can be prevented.

比較として、前述した特許文献１のように、炉頂ガス回収ライン３の炉頂圧回収設備３５よりも上流側からＢＦＧを取り出す場合（図１の分岐配管５１Ｐ参照）、熱風炉４の燃焼運転に供給されるＢＦＧに、高炉２の炉頂２１の圧力変動の影響を受ける可能性があるとともに、より高圧であるためＢＦＧ中の水分量が高く、熱風炉４のバーナ部分に導入された際に、熱風炉４の内部にミストを発生させ、耐火煉瓦の劣化などを招く可能性もある。
しかし、本実施形態では、炉頂ガス回収ライン３の炉頂圧回収設備３５よりも下流側からＢＦＧを取り出すようにしたので、これらの不都合を解消することができる。 For comparison, as in Patent Document 1 described above, when the BFG is taken out from the upstream side of the furnace top pressure recovery facility 35 of the furnace top gas recovery line 3 (see the branch pipe 51P in FIG. 1), the combustion operation of the hot air furnace 4 is performed. When the BFG supplied to the BFG is affected by the pressure fluctuation of the furnace top 21 of the blast furnace 2 and the water content in the BFG is high due to the higher pressure, it is introduced into the burner portion of the hot blast furnace 4. In addition, mist may be generated inside the hot air furnace 4 to cause deterioration of refractory bricks.
However, in the present embodiment, since the BFG is taken out from the downstream side of the furnace top pressure recovery facility 35 of the furnace top gas recovery line 3, these inconveniences can be solved.

本実施形態では、燃料ガス供給ライン５に昇圧機としてブロア５２を設置し、熱風炉４に供給されるＢＦＧを昇圧することができる。
このため、炉頂圧回収設備３５で圧力回収された後の低圧のＢＦＧを用いても、熱風炉４に導入されるＢＦＧを十分な高圧とすることができる。 In the present embodiment, the blower 52 can be installed as a booster in the fuel gas supply line 5 to boost the BFG supplied to the hot air furnace 4.
Therefore, even if the low pressure BFG after the pressure is recovered by the furnace top pressure recovery facility 35 is used, the BFG introduced into the hot air furnace 4 can be made sufficiently high pressure.

本実施形態では、煙道本管４４に設置された排気圧回収設備４４１により、熱風炉４の排ガスから排圧および排熱を回収し、回収した排圧および排熱のエネルギーを、昇圧機であるブロア５２および空気供給管４６のブロア４６１の動力に用いている。このため、熱風炉４の燃焼運転時のブロア５２，４６１の動力を、熱風炉４の燃焼運転時の排ガスからの回収エネルギーでまかなうことができ、運転コストを抑制することができる。
従って、本実施形態におけるブロア５２により実現される燃焼運転時の昇圧の効果は、前述した通りであるが、その動力についても熱風炉４の燃焼運転時の排エネルギーを利用することができ、運転に必要なコストを最小限にすることができる。 In the present embodiment, the exhaust pressure recovery equipment 441 installed in the flue main 44 recovers the exhaust pressure and the exhaust heat from the exhaust gas of the hot air furnace 4, and the recovered exhaust pressure and the exhaust heat energy are collected by the booster. It is used to power a blower 52 and a blower 461 of an air supply pipe 46. Therefore, the power of the blowers 52 and 461 during the combustion operation of the hot air furnace 4 can be supplied by the recovered energy from the exhaust gas during the combustion operation of the hot air furnace 4, and the operating cost can be suppressed.
Therefore, the effect of boosting during the combustion operation realized by the blower 52 in the present embodiment is as described above, but the exhaust energy during the combustion operation of the hot air furnace 4 can be used for the power thereof, and the operation can be performed. The cost required for this can be minimized.

前述した図２では、本実施形態の熱風炉装置１において、２本の熱風炉４を４５分サイクルで交替させる運転について説明した。これに対し、同じ熱風炉装置１において、３本の熱風炉４を３０分サイクルで運転してもよい。
図４において、熱風炉４Ａ〜４Ｃの３本は、それぞれ基準時点０分から３０分サイクルで、送風運転および燃焼運転を交互に実行させる。 In FIG. 2 described above, in the hot air furnace device 1 of the present embodiment, the operation of alternating the two hot air furnaces 4 in a 45-minute cycle has been described. On the other hand, in the same hot air furnace device 1, three hot air furnaces 4 may be operated in a 30-minute cycle.
In FIG. 4, each of the three hot air furnaces 4A to 4C alternately executes the blowing operation and the combustion operation in a cycle of 0 to 30 minutes at the reference time point.

熱風炉４Ａでは、基準時点０分から、送風運転を３０分行い、０．５分で送風運転から燃焼運転への切り替え（燃焼切替作業）を行い、燃焼運転を５９分行い、０．５分で燃焼運転から送風運転への切り替え（送風切替作業）を行い、以降これらの４つの工程を繰り返す。
送風運転は３０分で１サイクル分となる。燃焼運転５９分と燃焼および送風の切替作業０．５分が２回で合計６０分となり、２サイクル分に相当する。 In the hot air furnace 4A, the blowing operation is performed for 30 minutes from 0 minutes at the reference time, the switching from the blowing operation to the combustion operation (combustion switching work) is performed in 0.5 minutes, the combustion operation is performed for 59 minutes, and the combustion operation is performed in 0.5 minutes. Switching from the combustion operation to the blower operation (blower switching work) is performed, and then these four steps are repeated.
The ventilation operation takes 30 minutes for one cycle. The combustion operation of 59 minutes and the combustion and ventilation switching work of 0.5 minutes are performed twice, for a total of 60 minutes, which is equivalent to two cycles.

熱風炉４Ａの熱風炉内圧力については、前述した図２と同様である。
すなわち、送風運転時には、送風本管４３のブロア４３１により送風用の空気の昇圧が行われ、所定の熱風炉内圧力が維持される。一方、燃焼運転時には、燃料ガス供給ライン５のブロア５２により燃料ガスであるＢＦＧの昇圧が行われ、送風運転時と同じ熱風炉内圧力が維持される。
燃焼切替作業および送風切替作業では、空気の流通方向の反転のために、熱風炉４Ａ〜４Ｃの送風本管４３、煙道本管４４および熱風本管４５との接続部分にそれぞれ設置される図示しない開閉弁を駆動させるための切替時間が発生する。 The pressure inside the hot blast furnace 4A is the same as in FIG. 2 described above.
That is, during the blowing operation, the blower 431 of the blowing main 43 boosts the blowing air, and the predetermined hot air furnace pressure is maintained. On the other hand, during the combustion operation, the blower 52 of the fuel gas supply line 5 boosts the BFG, which is the fuel gas, and maintains the same pressure in the hot air furnace as during the blower operation.
In the combustion switching work and the blower switching work, in order to reverse the air flow direction, they are installed at the connection portions with the blower main 43, the flue main 44, and the hot air main 45 of the hot air furnaces 4A to 4C, respectively. No switching time is required to drive the on-off valve.

熱風炉４Ａの熱風炉内温度は、送風運転時に、送風に伴って低下してゆく。ただし、送風運転の時間が短いため、送風運転の終了時の温度は、前述した図２の送風運転よりも高い温度に保たれている。
一方、燃焼運転時には、燃焼室４２での燃焼により、徐々に上昇してゆき、送風運転の当初必要な温度が確保される。ただし、前述した送風運転時の温度低下の縮小に加え、燃焼運転の時間としてほぼ２サイクル分の時間（５９分）が確保されているため、図２の燃焼運転（２９分）よりも緩やかな上昇特性とすることができ、燃焼温度が低い燃焼運転または燃料ガスの消費が少ない燃焼運転とすることができる。また、燃焼が行われる燃焼室４２のサイズを小さくできる。 The temperature inside the hot blast furnace 4A decreases with the blast during the blast operation. However, since the blowing operation time is short, the temperature at the end of the blowing operation is maintained at a temperature higher than that of the blowing operation of FIG. 2 described above.
On the other hand, during the combustion operation, the temperature gradually rises due to the combustion in the combustion chamber 42, and the initially required temperature for the ventilation operation is secured. However, in addition to the reduction of the temperature drop during the ventilation operation described above, the combustion operation time is about 2 cycles (59 minutes), which is slower than the combustion operation (29 minutes) shown in FIG. It can be an ascending characteristic, and can be a combustion operation in which the combustion temperature is low or a combustion operation in which the consumption of fuel gas is small. Further, the size of the combustion chamber 42 in which combustion is performed can be reduced.

以上のような熱風炉４Ａに対し、熱風炉４Ｂでは、基準時点０分から、燃焼運転の後半および０．５分の送風切替作業に続いて、送風運転３０分、燃焼切替作業０．５分、燃焼運転５９分、送風切替作業０．５分の繰り返しが行われる。
また、熱風炉４Ｃでは、基準時点０分から、燃焼切替作業０．５分、燃焼運転５９分、送風切替作業０．５分、送風運転３０分が繰り返し行われる。 In contrast to the hot air furnace 4A as described above, in the hot air furnace 4B, from 0 minutes at the reference time, after the second half of the combustion operation and 0.5 minutes of the air blowing switching work, the air blowing operation is 30 minutes and the combustion switching work is 0.5 minutes. The combustion operation is repeated for 59 minutes and the ventilation switching work is repeated for 0.5 minutes.
Further, in the hot air furnace 4C, the combustion switching work 0.5 minutes, the combustion operation 59 minutes, the blower switching work 0.5 minutes, and the blower operation 30 minutes are repeatedly performed from 0 minutes at the reference time.

このように、図４の運転では、熱風炉４Ａ〜４Ｃが３０分サイクルで順次、送風運転と燃焼運転とを行うことができる。そして、熱風炉４Ａ〜４Ｃのいずれかが送風運転３０分を交替で行うことで、高炉２への熱風の供給を絶え間なく行うことができる。
また、均圧運転および排圧運転（図３参照）が不要であるため、各々の作業を解消することができるとともに、前述した均圧運転および排圧運転における圧力変動による機器の影響、結露の発生などの不都合を解消することができる。また、２本での送風運転を実施すれば、１本での送風運転に比べて送風温度を上げることができる。 As described above, in the operation of FIG. 4, the hot air furnaces 4A to 4C can sequentially perform the blowing operation and the combustion operation in a 30-minute cycle. Then, when any of the hot air furnaces 4A to 4C alternately performs the blowing operation for 30 minutes, the hot air can be continuously supplied to the blast furnace 2.
Further, since the pressure equalizing operation and the exhaust pressure operation (see FIG. 3) are not required, each operation can be eliminated, and the influence of the equipment due to the pressure fluctuation in the pressure equalization operation and the exhaust pressure operation described above and the dew condensation. Inconveniences such as occurrence can be eliminated. Further, if the blowing operation with two lines is carried out, the blowing temperature can be raised as compared with the blowing operation with one line.

なお、本発明は前述した実施形態に限定されるものではなく、本発明の目的を達成できる範囲での変形などは本発明に含まれる。
例えば、熱風炉装置１に設置される熱風炉４は３本に限らず、２本（図２の運転が可能）、４本以上（図２の運転または図４の運転が可能）であってもよい。例えば、熱風炉４が４本の場合、その２本ずつを前述した図２の運転とすることができるほか、１本を休止し、３本で図４の運転を行うようにしてもよい。もしくは、４本の熱風炉４のうち、２本を休止し、２本を運転してもよい。 The present invention is not limited to the above-described embodiment, and modifications within the range in which the object of the present invention can be achieved are included in the present invention.
For example, the number of hot air furnaces 4 installed in the hot air furnace device 1 is not limited to three, but two (the operation of FIG. 2 is possible) and four or more (the operation of FIG. 2 or the operation of FIG. 4 is possible). May be good. For example, when there are four hot air furnaces 4, each of the two may be operated in FIG. 2 described above, or one may be suspended and three may be operated in FIG. Alternatively, two of the four hot air furnaces 4 may be suspended and two may be operated.

前記実施形態では、図２のような４５分サイクルでの運転、あるいは、図４のような３０分サイクルの運転について説明したが、運転のサイクルタイムは適宜設定すればよく、例えば２０分サイクルと短くしてもよく、あるいは６０分サイクルと長くしてもよい。ただし、サイクルタイムが短いと、工程の切り替えが頻繁となって効率的でない場合もある。一方、サイクルタイムを長くするためには、熱風炉４の容量の大きさが必要となるほか、送風運転および燃焼運転での熱風炉内温度の変化幅が制限される場合もある。従って、熱風炉装置１としての要求条件に応じてサイクルタイムを適宜設定することが望ましい。 In the above embodiment, the operation in the 45-minute cycle as shown in FIG. 2 or the operation in the 30-minute cycle as shown in FIG. 4 has been described, but the cycle time of the operation may be appropriately set, for example, a 20-minute cycle. It may be shortened, or it may be as long as a 60-minute cycle. However, if the cycle time is short, the process may be switched frequently, which may not be efficient. On the other hand, in order to lengthen the cycle time, the capacity of the hot air furnace 4 needs to be large, and the range of change in the temperature inside the hot air furnace during the blowing operation and the combustion operation may be limited. Therefore, it is desirable to appropriately set the cycle time according to the requirements of the hot air furnace device 1.

前記実施形態では、熱風炉４は外燃式としたが、内燃式あるいは炉頂燃焼式などであってもよく、その形式は限定されない。
また、昇圧機としてブロア５２を用いたが、燃料ガス供給ライン５を通る燃料ガスを昇圧できる装置であれば、他の構成の昇圧機であってもよい。
また、各々の熱風炉４の煙道本管４４に至る排ガスラインに、流量計および流量調整装置を設け、燃料ガスと空気量に見合った排ガス量になるように流量調整することで、燃焼運転と送風運転との切替時の弁の切替動作を不要としてもよい。 In the above embodiment, the hot air furnace 4 is an external combustion type, but it may be an internal combustion type, a furnace top combustion type, or the like, and the type is not limited.
Further, although the blower 52 is used as the booster, a booster having another configuration may be used as long as it is a device capable of boosting the fuel gas passing through the fuel gas supply line 5.
Further, a flow meter and a flow rate adjusting device are provided in the exhaust gas line leading to the flue main 44 of each hot air furnace 4, and the flow rate is adjusted so as to match the amount of fuel gas and air, thereby performing combustion operation. It is also possible to eliminate the need for the valve switching operation when switching between the air and the blower operation.

本発明は熱風炉装置および熱風炉運転方法に利用できる。 The present invention can be used for a hot air furnace device and a hot air furnace operating method.

１…熱風炉装置、２…高炉、２１…炉頂、２２…装入装置、２３…羽口、２４…環状管、３…炉頂ガス回収ライン、３１…炉頂配管、３２…ダストキャッチャ、３３…第１ベンチュリスクラバ、３４…第２ベンチュリスクラバ、３５…炉頂圧回収設備、３６…ガスホルダ、４，４Ａ，４Ｂ，４Ｃ…熱風炉、４１…蓄熱室、４２…燃焼室、４３…送風本管、４３１…送風用のブロア、４４…煙道本管、４４１…排気圧回収設備、４５…熱風本管、４６…空気供給管、４６１…燃焼用空気加圧用のブロア、４７…燃料ガス供給管、５…燃料ガス供給ライン、５１，５１Ｐ…分岐配管、５２…昇圧機であるブロア。 1 ... hot air furnace device, 2 ... blast furnace, 21 ... furnace top, 22 ... charging device, 23 ... tuyere, 24 ... annular pipe, 3 ... furnace top gas recovery line, 31 ... furnace top piping, 32 ... dust catcher, 33 ... 1st Venturi Slava, 34 ... 2nd Venturi Slava, 35 ... Furnace top pressure recovery equipment, 36 ... Gas holder, 4, 4A, 4B, 4C ... Hot air furnace, 41 ... Heat storage chamber, 42 ... Combustion chamber, 43 ... Blower Main pipe, 431 ... Blower for ventilation, 44 ... Smoke main, 441 ... Exhaust pressure recovery equipment, 45 ... Hot air main, 46 ... Air supply pipe, 461 ... Blower for combustion air pressurization, 47 ... Fuel gas Supply pipe, 5 ... Fuel gas supply line, 51, 51P ... Branch pipe, 52 ... Blower which is a booster.

Claims (8)

高炉に熱風を送風する送風運転および熱風炉内で燃料ガスを燃焼させる燃焼運転を行う熱風炉と、前記高炉の炉頂ガスを前記燃料ガスとして前記熱風炉に供給する燃料ガス供給ラインと、前記燃料ガス供給ラインに設置されて前記燃料ガスを昇圧する昇圧機とを有し、前記昇圧機は前記燃料ガスを昇圧し、前記熱風炉の前記燃焼運転時の炉内圧力を前記熱風炉の前記送風運転時と同じ炉内圧力にすることを特徴とする熱風炉装置。 A hot air furnace that blows hot air to the blast furnace and a combustion operation that burns fuel gas in the hot air furnace, a fuel gas supply line that supplies the top gas of the blast furnace as the fuel gas to the hot air furnace, and the above. is installed in the fuel gas supply line possess a booster for boosting the fuel gas, the booster boosts the fuel gas, the said furnace pressure during combustion operation of the hot stove of the hot stove A hot-air furnace device characterized in that the pressure inside the furnace is the same as during the blowing operation. 請求項１に記載された熱風炉装置において、
前記燃料ガス供給ラインは、前記高炉の炉頂から前記炉頂ガスを取り出す炉頂ガス回収ラインの炉頂圧回収設備よりも下流側から前記炉頂ガスを取り出すことを特徴とする熱風炉装置。 In the hot air furnace apparatus according to claim 1,
The fuel gas supply line is a hot blast furnace apparatus characterized in that the top gas is taken out from the downstream side of the top pressure recovery facility of the top gas recovery line for taking out the top gas from the top of the blast furnace. 請求項１または請求項２に記載された熱風炉装置において、
前記燃焼運転時の前記熱風炉の排ガスから排圧および排熱を回収する排熱回収設備を有し、前記昇圧機は前記排熱回収設備で回収した排圧および排熱を動力に用いることを特徴とする熱風炉装置。 In the hot air furnace apparatus according to claim 1 or 2.
It has an exhaust heat recovery facility that recovers exhaust pressure and exhaust heat from the exhaust gas of the hot air furnace during the combustion operation, and the booster uses the exhaust pressure and exhaust heat recovered by the exhaust heat recovery facility as power. A featured hot air furnace device. 高炉に熱風を送風する送風運転および熱風炉内で燃料ガスを燃焼させる燃焼運転を行う熱風炉の運転方法であって、
前記高炉の炉頂ガスを前記燃料ガスとして前記熱風炉に供給するとともに、前記熱風炉に供給される前記燃料ガスを昇圧機で昇圧し、前記熱風炉の前記燃焼運転時の炉内圧力を前記熱風炉の前記送風運転時と同じ炉内圧力にすることを特徴とする熱風炉運転方法。 It is an operation method of a hot blast furnace that performs a blast operation that blows hot air to the blast furnace and a combustion operation that burns fuel gas in the hot blast furnace.
The top gas of the blast furnace is supplied to the hot air furnace as the fuel gas, the fuel gas supplied to the hot air furnace is boosted by a booster, and the pressure inside the hot air furnace during the combustion operation is adjusted. A method for operating a hot blast furnace, characterized in that the pressure inside the hot blast furnace is the same as that during the blowing operation of the hot blast furnace. 請求項４に記載された熱風炉運転方法において、
前記燃料ガスとして、前記高炉の炉頂から取り出されて炉頂圧回収設備で圧力回収された前記炉頂ガスを用いることを特徴とする熱風炉運転方法。 In the hot air furnace operating method according to claim 4,
A hot-air furnace operating method, characterized in that, as the fuel gas, the top gas that is taken out from the top of the blast furnace and whose pressure is recovered by the top pressure recovery facility is used. 請求項４または請求項５に記載された熱風炉運転方法において、
前記燃焼運転時の前記熱風炉の排ガスから排圧および排熱を回収し、回収した排圧および排熱を前記昇圧機の動力に用いることを特徴とする熱風炉運転方法。 In the hot air furnace operating method according to claim 4 or 5.
A method for operating a hot air furnace, characterized in that exhaust pressure and waste heat are recovered from the exhaust gas of the hot air furnace during the combustion operation, and the recovered exhaust pressure and exhaust heat are used as power for the booster. 請求項４から請求項６のいずれか一項に記載された熱風炉運転方法において、
前記送風運転と、前記熱風炉を前記送風運転から前記燃焼運転に切り替える燃焼切替作業と、前記燃焼運転と、前記熱風炉を前記燃焼運転から前記送風運転に切り替える送風切替作業と、を繰り返すとともに、
前記燃焼切替作業、前記燃焼運転および前記送風切替作業の合計時間を、前記送風運転を行う時間以下とすることを特徴とする熱風炉運転方法。 In the hot air furnace operating method according to any one of claims 4 to 6,
The blast operation, the combustion switching operation of switching the hot blast furnace from the blast operation to the combustion operation, the combustion operation, and the blast switching operation of switching the hot blast furnace from the combustion operation to the blast operation are repeated, and the operation is repeated.
A hot air furnace operating method, characterized in that the total time of the combustion switching operation, the combustion operation, and the blower switching work is set to be equal to or less than the time for performing the blower operation. 請求項４から請求項６のいずれか一項に記載された熱風炉運転方法において、
前記送風運転と、前記熱風炉を前記送風運転から前記燃焼運転に切り替える燃焼切替作業と、前記燃焼運転と、前記熱風炉を前記燃焼運転から前記送風運転に切り替える送風切替作業と、を繰り返すとともに、
前記燃焼切替作業、前記燃焼運転および前記送風切替作業の合計時間を、前記送風運転を行う時間の２倍以下とすることを特徴とする熱風炉運転方法。 In the hot air furnace operating method according to any one of claims 4 to 6,
The blast operation, the combustion switching operation of switching the hot blast furnace from the blast operation to the combustion operation, the combustion operation, and the blast switching operation of switching the hot blast furnace from the combustion operation to the blast operation are repeated, and the operation is repeated.
A hot air furnace operating method characterized in that the total time of the combustion switching operation, the combustion operation, and the blower switching work is set to be twice or less the time for performing the blower operation.
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