JP2008291354A5

JP2008291354A5 -

Info

Publication number: JP2008291354A5
Application number: JP2008116023A
Authority: JP
Filing date: 2008-04-25
Publication date: 2010-12-16
Anticipated expiration: 2028-04-25

Description

上記目的を達成するために、本発明は、循環移動するパレット上に粉鉱石と炭材を含む焼結原料を装入して、パレット上に焼結原料の装入層を形成する装入工程と、装入層表面の炭材に点火炉を使って点火する点火工程と、気体燃料を装入層上方の空気中に供給して希釈し、燃焼下限濃度以下の希釈気体燃料を得る希釈気体燃料生成工程と、パレット下に配置されたウインドボックスの吸引力により、上記希釈気体燃料と空気とを装入層内に吸引し、該希釈気体燃料を焼結層内において燃焼させると同時に、装入層内に吸引した空気により、該装入層内の炭材を燃焼させることにより、焼結ケーキを生成させる燃焼工程とを有する焼結鉱の製造方法において、上記燃焼工程は、焼結原料中の炭材量および／または希釈気体燃料の供給量または濃度を変えることによって、焼結層内の最高到達温度を１２００℃超え１３８０℃未満に保持する工程、および／または、装入層内の温度が１２００℃以上に保持される高温域保持時間の延長を図る工程であることを特徴とする焼結鉱の製造方法を提案する。 In order to achieve the above object, the present invention provides a charging step of charging a sintered raw material containing fine ore and carbonaceous material on a circulating pallet and forming a charging layer of the sintered raw material on the pallet. And an ignition process in which an ignition furnace is used to ignite the charcoal material on the surface of the charging layer, and a diluted gas that supplies and dilutes gaseous fuel into the air above the charging layer to obtain a diluted gaseous fuel that is below the lower combustion limit concentration The diluted gas fuel and air are sucked into the charging layer by the fuel generation process and the suction force of the wind box disposed under the pallet, and the diluted gas fuel is burned in the sintered layer and simultaneously loaded. the air sucked into the sintering bed by combusting the carbonaceous material in該装sintering bed, in the manufacturing method of sintered ore and a combustion process to produce a sintered cake, the combustion process, sintering raw material The amount of carbonaceous material and / or the supply of diluted gas fuel or By changing the degree, the step of maintaining the maximum reached temperature in the sintered layer above 1200 ° C. and below 1380 ° C. and / or extending the high temperature region holding time in which the temperature in the charging layer is maintained at 1200 ° C. or higher. The manufacturing method of the sintered ore characterized by being the process of aiming at is proposed.

本発明の焼結鉱の製造方法において、上記燃焼工程では、
（ａ）最高到達温度を１２０５〜１３５０℃に保持すること、
（ｂ）装入層の上から導入した希釈気体燃料の少なくとも一部を未燃焼のまま前記装入層中の焼結層の燃焼・溶融帯に到達するようにして燃焼させること、
（ｃ）装入層の上から導入した希釈気体燃料を装入層内で燃焼させることによって、燃焼・溶融帯の高さ方向の厚みおよび／またはパレット進行方向の幅を拡大させること、
（ｄ）装入層の上から導入した希釈気体燃料を装入層内で燃焼させることによって、燃焼・溶融帯の高温域保持時間を延長させること、を特徴とする。 The method of manufacturing a sintered ore of the present invention, in the combustion process,
(A) holding the highest reached temperature of 1,205 to 1350 ° C.,
(B) and Turkey To is burned to reach the combustion and melting zone of the sintering layer in at least remain the instrumentation part unburned sintering bed dilution gaseous fuel introduced from above the sintering bed,
(C) by combusting the diluted gaseous fuel introduced from above the sintering bed in the sintering bed within, thereby enlarging the width of the thickness in the height direction of the combustion and melting zone and / or the pallet advancing direction,
( D ) The diluted gas fuel introduced from above the charging layer is combusted in the charging layer, thereby extending the high temperature region holding time of the combustion / melting zone.

また、本発明の方法において、上記燃焼工程では、
（ａ）希釈気体燃料の装入層への導入位置を変化させること、
（ｂ）希釈気体燃料の装入層への導入を、点火炉以降の位置で行うこと、
（ｃ）希釈気体燃料の装入層への導入を、装入層表層部に焼結ケーキが生成されてから焼結が完了するまでの間に行うこと、
（ｄ）希釈気体燃料の焼結層内への導入を、燃焼・溶融帯の厚みが１５ｍｍ以上となる領域において行うこと、
（ｅ）希釈気体燃料の装入層への導入を、燃焼前線が装入層表層下１００ｍｍに達した位置以降で行うこと、
（ｆ）希釈気体燃料の装入層への導入を、装入層の両サイドウォール近傍において行うこと、を特徴とする。 Further, in the method of the present invention, in the combustion process,
(A) changing the introduction position of the diluted gas fuel into the charging layer;
(B) the introduction into the sintering bed of the diluted gaseous fuel, be carried out at the position of the ignition furnace and later,
(C) the introduction into the sintering bed of the diluted gaseous fuel, be carried out between been generated sinter cake sintering bed surface portion until the sintering is completed,
(D) the introduction into the sintered layer of the diluted gaseous fuel, be carried out in a region where the thickness of the combustion and melting zone is equal to or greater than 15 mm,
(E) the introduction into the sintering bed of the diluted gaseous fuel, be carried out in subsequent position where the combustion front reaches the sintering bed subsurface 100 mm,
The introduction into the sintering bed in (f) dilution gaseous fuel, be carried out in both side walls near the sintering bed, characterized by.

また、本発明は、循環移動するパレットと、そのパレット上に粉鉱石と炭材を含む焼結原料を装入して装入層を形成する原料供給装置と、その焼結原料中の炭材に点火するための点火炉と、上記パレットの下方にウインドボックスを備える焼結機において、上記点火炉の下流側に、気体燃料を装入層上方の大気中に吐出し、空気と混合させて、燃焼下限濃度以下の希釈気体燃料とする気体燃料供給装置が配設されてなることを特徴とする焼結機である。 The present invention also includes a pallet that circulates, a raw material supply device that forms a charged layer by charging a sintered raw material containing fine ore and carbonaceous material on the pallet, and a carbonaceous material in the sintered raw material. an ignition furnace for igniting the, in the sintering machine provided with wind box below the pallet, on the downstream side of the ignition furnace, discharging the gaseous fuel into the atmosphere of the sintering bed above side, is mixed with air The sintering machine is characterized in that a gaseous fuel supply device for diluting gaseous fuel having a concentration lower than the lower limit of combustion is provided.

本発明における上記気体燃料供給装置は、
（ａ）パレットの幅方向に沿って、複数の気体燃料供給パイプを配設し、そのパイプには、気体燃料を吐出するスリットあるいは開口を設けるかまたはノズルを配設してなる構造を有するものであること、
（ｂ）パレットの進行方向に沿って、複数の気体燃料供給パイプを配設し、そのパイプには、気体燃料を吐出するスリットあるいは開口を設けるかまたはノズルを配設してなる構造を有するものであること、を特徴とする。 The gaseous fuel supply device in the present invention is
(A) along the width direction of the pallet, and disposed a plurality of gaseous fuel supply pipes, the the pipe, which has a structure formed by disposing or nozzle slits or openings for discharging the gaseous fuel Being
( B ) A plurality of gaseous fuel supply pipes are provided along the direction of travel of the pallet, and the pipes have a structure in which slits or openings for discharging gaseous fuel are provided or nozzles are provided. It is characterized by .

また、本発明における上記気体燃料供給装置は、
（ａ）パレット幅方向における気体燃料の供給量を変えることができるものであること、
（ｂ）パレット幅方向の吸引速度の分布に応じて、吸引速度の大きい部分には多くの燃料を供給し、吸引速度の小さい部分には燃料供給量を少なくすることにより、吸引空気量当りの燃料濃度を一定に保てるようにしたこと、を特徴とする。 Moreover, the gaseous fuel supply apparatus in the present invention is:
(A) The supply amount of gaseous fuel in the pallet width direction can be changed ,
(B) Depending on the distribution of the suction speed in the pallet width direction, a large amount of fuel is supplied to a portion where the suction speed is high, and a fuel supply amount is reduced to a portion where the suction speed is low, so that The fuel concentration can be kept constant.

また、本発明における上記気体燃料供給装置は、
（ａ）気体燃料の吐出を、装入層表面上方３００ｍｍ以上の高さで行なうものであること、
（ｂ）装入層表面上方３００ｍｍ以上の高さで、気体燃料の吐出位置を変える昇降機構を有すること、を特徴とする。 Moreover, the gaseous fuel supply apparatus in the present invention is:
(A) discharging gaseous fuel at a height of 300 mm or more above the charging layer surface;
(B) in the sintering bed above the surface of 300mm or more height, it has a lifting mechanism for changing a discharge position of the gaseous fuel, characterized by.

Claims

A charging step of charging a sintered raw material including powdered ore and carbonaceous material on a circulating pallet and forming a charging layer of the sintered raw material on the pallet;
An ignition process for igniting the charcoal material on the surface of the charging layer using an ignition furnace;
A diluted gas fuel generating step of diluting by supplying gaseous fuel into the air above the charging layer and obtaining a diluted gaseous fuel below the lower combustion limit concentration;
The diluted gas fuel and air are sucked into the charging layer by the suction force of the wind box placed under the pallet, and the diluted gas fuel is burned in the sintered layer and simultaneously sucked into the charging layer. In the method for producing a sintered ore having a combustion step of generating a sintered cake by burning the carbonaceous material in the charging layer with air that has been performed ,
The combustion step includes a step of maintaining the maximum temperature in the sintered layer at a temperature exceeding 1200 ° C. and lower than 1380 ° C. by changing the amount of carbonaceous material in the sintered raw material and / or the supply amount or concentration of the diluted gas fuel, and / Or a method for producing a sintered ore, which is a step of extending a high temperature region holding time in which the temperature in the charging layer is maintained at 1200 ° C. or higher .

2. The method for producing a sintered ore according to claim 1 , wherein in the combustion step , the maximum temperature reached is 1201 to 1350 ° C. 3.

Above the combustion process, it is burnt so as to reach the combustion and melting zone of the sintering layer in while the sintering bed unburned at least a portion of the diluted gaseous fuel introduced from above the sintering bed Turkey The manufacturing method of the sintered ore of Claim 1 or 2 characterized by these.

In the above combustion process , by diluting gaseous fuel introduced from above the charging layer in the charging layer, the thickness in the height direction of the combustion / melting zone and / or the width in the pallet traveling direction is expanded. The manufacturing method of the sintered ore of any one of Claims 1-3 characterized by the above-mentioned.

In the combustion process, by combusting the diluted gaseous fuel introduced from above the sintering bed in the sintering bed within, according to claim 1-4, characterized in that to extend the high temperature zone holding time in the combustion and melting zone The manufacturing method of the sintered ore of any one of Claims 1 .

In the said combustion process , the introduction position to the charging layer of dilution gas fuel is changed , The manufacturing method of the sintered ore of any one of Claims 1-5 characterized by the above-mentioned.

In the combustion process, the introduction into the sintering bed of the diluted gaseous fuel, the production method of the sintered ore according to any one of claims 1 to 6, characterized in that at the position of the ignition furnace after .

In the combustion process, claims, characterized in that the introduction into the sintering bed of the diluted gaseous fuel, while since the generated sinter cake sintering bed surface portion until the sintering is completed method for producing sintered ore according to any one of 1-7.

In the combustion process, the introduction into the sintered layer of the diluted gaseous fuel, in any one of claims 1 to 8, the thickness of the combustion and melting zone and performing in the region equal to or larger than 15mm The manufacturing method of the sintered ore as described.

In the combustion process, the introduction into the sintering bed of the diluted gaseous fuel, any one of claims 1 to 9, characterized in that in the subsequent position where the combustion front reaches the sintering bed subsurface 100mm The manufacturing method of the sintered ore as described in 1 ..

In the combustion process, the introduction into the sintering bed of the diluted gaseous fuel, sintered ore according to any one of claims 1 to 10, characterized in that on both side walls near the sintering bed Manufacturing method.

To the diluted gaseous fuel, according to any one of claims 1 to 11, characterized in that a combustible gas is diluted to a concentration of 75% or less and 2% or more of the lower flammable limit concentration of sintered ore Production method.

To the diluted gaseous fuel, according to any one of claims 1 to 11, characterized in that a combustible gas diluted to 60% or less and the concentration of 2% or more of the lower flammable limit concentration of sintered ore Production method.

To the diluted gaseous fuel, according to any one of claims 1 to 11, characterized in that a combustible gas is diluted to a concentration of less and 2% or more 25% of lower flammable limit concentration of sintered ore Production method.

The gaseous fuel is any flammable gas selected from blast furnace gas, coke oven gas, blast furnace / coke oven mixed gas, city gas, natural gas, methane gas, ethane gas, propane gas, and mixed gas thereof. method for producing sintered ore according to any one of claims 1 to 14, wherein.

A circulating pallet,
A raw material supply device for charging a sintered raw material containing fine ore and carbonaceous material on the pallet to form a charging layer;
An ignition furnace for igniting the carbonaceous material in the sintered raw material;
In a sintering machine provided with a wind box below the pallet,
At the downstream side of the ignition furnace, discharging the gaseous fuel into the atmosphere of the sintering bed on hand, by mixing with air, the gas fuel supply device is disposed to lower flammable limit concentration following dilution gaseous fuel A sintering machine characterized by

The gaseous fuel supply device includes a plurality of gaseous fuel supply pipes arranged along the width direction of the pallet, and the pipes are provided with slits or openings for discharging gaseous fuel or nozzles. The sintering machine according to claim 16 , wherein the sintering machine has a structure.

The gaseous fuel supply device is provided with a plurality of gaseous fuel supply pipes along the direction of travel of the pallet, and the pipes are provided with slits or openings for discharging gaseous fuel or nozzles. The sintering machine according to claim 16 , wherein the sintering machine has a structure.

The gaseous fuel supply apparatus has a structure in which a slit or opening for discharging gaseous fuel is provided in a fuel supply pipe or a nozzle is provided, and the diameter of the opening is in the range of 0.5 to 3 mmφ. The sintering machine according to claim 16 , wherein:

The gas fuel supply apparatus, the sintering machine according to any one of claims 16 to 19, characterized in that is capable of changing the supply amount of gaseous fuel in the pallet width direction.

The gaseous fuel supply device is configured to supply a large amount of fuel to a portion with a high suction speed and reduce a fuel supply amount to a portion with a low suction speed according to the distribution of the suction speed in the pallet width direction. The sintering machine according to any one of claims 16 to 20, wherein the fuel concentration per air amount can be kept constant.

The gas fuel supply apparatus, the gaseous fuel, above the sintering bed, according to any one of claims 16 to 21, characterized in that those ejected downward toward the sintering bed baked The machine.

The gas fuel supply apparatus, the gaseous fuel, above the sintering bed, sintering according to any one of claims 16 to 21, characterized in that those ejected in parallel to the sintering bed surface Machine.

The gas fuel supply apparatus, the gaseous fuel, above the sintering bed, sintering machine according to any one of claims 16 to 21, characterized in that those ejected toward the reflecting plate.

In the gaseous fuel supply device, the direction of the gas discharge slit, opening or nozzle provided in the gaseous fuel supply pipe is dispersed in the range of ± 90 degrees with respect to the vertical direction toward the charged layer surface. sintering machine according to any one of claims 16 to 21, characterized in that those.

The gas fuel supply apparatus, rotatable about the axis of the gaseous fuel supply pipes, sintering machine according to any one of claims 16 to 21, characterized in that the discharge direction is intended to swing .

The gas fuel supply apparatus, the discharge of the gaseous fuel, the sintering machine according to any one of claims 16 to 26, characterized in that those performed in the sintering bed above the surface of 300mm or more height.

The gas fuel supply apparatus, in the sintering bed above the surface of 300mm or more height, sintering according to any one of claims 16 to 26, characterized in that it comprises a lifting mechanism for changing a discharge position of the gaseous fuel Machine.

The gas fuel supply apparatus, the gaseous fuel, the sintering machine according to any one of claims 16 to 28, characterized in that eject more than twice the rate of the burn rate of the gaseous fuel.

The gas fuel supply apparatus, the gaseous fuel, the sintering machine according to any one of claims 16 to 29, characterized in that eject more than twice the speed of the turbulent burning velocity of the gaseous fuel.

The gas fuel supply apparatus, the gaseous fuel, the nozzle, the opening or slit, to any one of claims 16 to 30, characterized in that ejected at a pressure less than 300mmAq or more with respect to ambient pressure 40000mmAq The sintering machine described.

The gas fuel supply apparatus, the sintering machine according to any one of claims 16 to 31, characterized by comprising disposed at least above the ignition furnace downstream of the captain direction of the sintering machine.

The gas fuel supply apparatus in the pallet advancing direction, claim, characterized in that formed by a location disposed between the stage where the combustion front has advanced under the sintering bed surface until sintering is complete. 16 32 sintering machine according to any one of.

The gas fuel supply apparatus, the sintering machine according to any one of claims 16 to 33, characterized by comprising disposed near the sidewall.

The gaseous fuel is any flammable gas selected from blast furnace gas, coke oven gas, blast furnace / coke oven mixed gas, city gas, Tennobu gas, methane gas, ethane gas, propane gas and mixed gas thereof. sintering machine according to any one of claims 16 to 34, characterized in that.

Said gaseous fuel, sintering machine according to any one of claims 16 to 34, wherein city gas 13A, is either propane gas.

Said gaseous fuel, sintering machine according to any one of claims 16 to 36 in which the CO content is characterized in that it is of less 50Massppm.

It said gaseous fuel, ignition temperature in the gaseous state is, according to any one of claims 16 to 34 and 37, characterized in that is obtained by vaporizing a high liquid fuel than the temperature of the sintering bed surface Sintering machine.

The sintering machine according to claim 38 , wherein the liquid fuel is alcohols, ethers, petroleums, or other hydrocarbon compounds.

40. The sintering machine according to claim 38 or 39 , wherein the gaseous fuel supply pipe in the case of using the liquid fuel is maintained at a temperature equal to or higher than a boiling point of the liquid fuel and lower than an ignition temperature.