JP5440435B2 - Method for producing sintered ore and sintering machine - Google Patents

Description

  The present invention relates to a method for producing a sintered ore and a sintering machine for producing a sintered ore for a blast furnace raw material.

  For example, as shown in Patent Document 1, the above-mentioned sintered ore is manufactured by using a downward suction type sintering machine (dwightroid type sintering machine). This lower suction type sintering machine is arranged above a plurality of sintered pallet trucks that circulate, a raw material charging portion for charging sintered raw materials into the sintered pallet, and a sintered pallet to be conveyed An ignition furnace, a lower suction part for sucking from below the sintered pallet to be conveyed, and an exhausting part for discharging the sinter cake generated in the sintering pallet are provided.

  In such a downward suction type sintering machine, a raw material charging portion is used to charge a sintered raw material into a sintering pallet to form a sintered raw material layer, and while transferring the sintered pallet, While igniting the solid fuel located in the surface layer part of the sintering raw material layer in the sintering pallet and suctioning from below by the lower suction part, the sintering proceeds from the upper side to the lower side of the sintering raw material layer. Then, a sintered ingot called a sinter cake is generated, and the sinter cake is pulverized by a crusher provided in the discharge section to produce a sintered ore having a particle size of about 20 mm, for example. .

  Here, the sintering raw material charged into the sintering pallet is a mixture of iron ore raw material and auxiliary raw material such as limestone with coke which is a solid fuel. In the sintered raw material layer in which such sintered raw materials are laminated, coke is burned by the ignition furnace, limestone added as an auxiliary raw material and some iron ore are melted to form a melt, and this melt is It becomes the binder phase that binds the iron ore raw materials, and produces the above-mentioned sinter cake (sintered lump).

  By the way, when manufacturing a sintered ore using a downward suction-type sintering machine, since the surface layer (upper surface) of the sintering raw material layer is exposed to the outside air, in the surface layer portion of the sintering raw material layer, coke When the combustion is finished, the temperature quickly decreases. Therefore, for example, the time for which the temperature is maintained at a high temperature of 1300 to 1400 ° C. is shortened, the melt serving as the binder phase is not sufficiently generated, and the sintering becomes insufficient. Then, since the strength of the surface layer portion is low in the obtained sinter cake, the surface layer portion cannot be used as a sintered ore to be charged into a blast furnace, and the production efficiency of the sintered ore is reduced. It was.

Therefore, as means for solving the heat shortage in the surface layer portion of the sintering material layer, for example, Patent Documents 2 and 3 disclose that gaseous fuel is directed toward the surface layer of the sintering material layer after igniting the sintering material layer in an ignition furnace. A technique for injecting water is disclosed.
Patent Document 4 discloses a technique in which a hood is disposed on a sintered raw material layer and air or a mixed gas of coke oven gas and combustible gas is blown through the hood.
Furthermore, Patent Document 5 discloses a technique for supplying liquid fuel toward the surface layer of a sintering material layer after igniting the sintering material layer in an ignition furnace.

Japanese Patent Laid-Open No. 04-314833 Japanese Patent Laid-Open No. 48-18102 JP 2008-291354 A JP-A-55-18585 JP 2009-228133 A

  By the way, in the invention described in Patent Documents 2-5, gaseous fuel, combustible gas, or liquid fuel is configured to be supplied toward the surface layer portion of the sintered raw material layer ignited in the ignition furnace. Gaseous fuel, combustible gas, or liquid fuel is ignited because the temperature of the upper part of the sintering material layer is relatively high, or ignited by the type of fire that jumps out of the ignition furnace. There was a risk of burning before reaching the surface layer. For this reason, heat from combustion of gaseous fuel, combustible gas, or liquid fuel is not sufficiently transmitted to the surface layer portion of the sintering raw material layer, resulting in a significant decrease in thermal efficiency. There was a problem that it was not possible to do it. Therefore, the surface layer portion of the sintering raw material layer cannot be sufficiently sintered despite the supply of the corner, gaseous fuel, combustible gas or liquid fuel, and the production yield of sintered ore can be improved. I couldn't plan.

  The present invention has been made in view of the above-described situation, and is capable of efficiently increasing the temperature of the surface layer portion of the sintering raw material layer and improving the production yield of the sintered ore. It aims at providing the manufacturing method and sintering machine of a ore.

  In order to solve the above-mentioned problems, a method for producing a sintered ore according to the present invention uses a downward suction type sintering machine having a circulation type sintering pallet to sinter a sintering raw material and thereby sinter the ore. A method for producing a sintered ore that produces a sintered raw material layer by charging the sintered pallet with the sintered raw material containing an iron-containing raw material, an auxiliary raw material, and a solid fuel. A step of transferring the sintering pallet on which the sintering material layer is formed to an ignition furnace, and igniting a solid fuel located in a surface layer portion of the sintering material layer in the ignition furnace; By sucking air from the lower side of the unloaded sintering pallet, the combustion zone is moved from the upper side to the lower side of the sintering raw material layer, and the sintering raw material layer is sintered to produce a sinter cake. The sintering process and the sintering pallet transported to the discharge section. A discharge process for discharging the tar cake, and spraying water to the sintering material layer in the sintering pallet in a section in which the sintering pallet is transported from the ignition furnace to the discharging part. And a liquid fuel spraying step of spraying liquid fuel to the sintering material layer in the sintering pallet in which water is sprayed.

According to the method of manufacturing a sintered ore with this configuration, water is sprayed on the sintering raw material layer in the sintering pallet in a section in which the sintering pallet is transported from the ignition furnace to the discharge portion. Water spraying step and a liquid fuel spraying step of spraying liquid fuel to the sintered raw material layer sprayed with water, when spraying the liquid fuel on the sintering raw material layer, The surface layer portion of the sintered raw material layer has a low temperature, and the liquid fuel is prevented from igniting and burning before reaching the sintered raw material layer. Further, even if the fire type comes out from the ignition furnace, the fire type is extinguished by the water spraying process, and the liquid fuel is prevented from being ignited.
Thus, according to the method for producing a sintered ore of the present invention, the liquid fuel can be prevented from inadvertently burning before reaching the surface layer portion of the sintered material layer, and the surface layer of the sintered material layer can be prevented. It becomes possible to burn the liquid fuel in the section. As a result, the heat from combustion is efficiently transferred to the sintering material layer, the surface layer portion of the sintering material layer can be sufficiently sintered, and the production efficiency of sintered ore is greatly improved. It becomes possible.

Here, in the water spraying step, it is preferable to adjust the spraying amount of water so that the surface temperature of the sintering raw material layer is lower than the ignition point of the liquid fuel.
In this case, since the surface temperature of the sintered raw material layer is made lower than the ignition point of the liquid fuel by the water spraying step, it is ensured that the liquid fuel ignites and burns above the sintered raw material layer. Can be prevented.

The liquid fuel is preferably an organic compound composed of one or more of alcohols having a hydroxyl group or hydrocarbons containing an oxygen atom in a chemical structural formula.
In the case of alcohols having a hydroxyl group or hydrocarbons containing oxygen atoms in the chemical structural formula, the liquid fuel itself contains oxygen, so that it can be sufficiently burned even under a low air ratio. Therefore, it can be burned efficiently in the sintering raw material layer. Examples of the hydrocarbon containing an oxygen atom in the chemical structural formula include an organic compound having a carbosyl group, an organic compound having an aldehyde group, and an organic compound containing an ether bond. Furthermore, since organic compounds in a liquid state at room temperature can be easily mixed, a mixture of these organic compounds may be used as a liquid fuel.

Furthermore, in the water spraying step, it is preferable to spray water in a plurality of stages.
In this case, water can be uniformly sprayed on the sintering material layer. Even when the amount of water sprayed is large, a large amount of water is sprayed in a plurality of stages, so there is no risk of extinguishing the combustion zone in the sintering material layer. Therefore, even if water is sprinkled on the sintering material layer, the combustion in the sintering material layer can be maintained in a stable state.

  In addition, the sintering machine according to the present invention includes a plurality of sintering pallets that circulate, a raw material charging portion that charges the sintering raw material into the sintering pallet, and a sintering formed in the sintering pallet. Ignition furnace for igniting solid fuel located on the surface layer part of the sintering raw material layer, a lower suction part for sucking air from the lower side of the sintering pallet, and a sinter cake obtained by sintering the sintering raw material layer A lower suction type sintering machine having a discharge portion that discharges the sintering pallet from the sintering pallet, wherein the sintering pallet is conveyed from the ignition furnace to the discharge portion in the section where the sintering is performed. Water spraying means for spraying water on the sintered raw material layer in the pallet, and liquid fuel spraying means for spraying liquid fuel on the sintered raw material layer in the sintering pallet are provided, The liquid fuel spraying means is located closer to the exhaust portion than the water spraying means. It is characterized in that it is arranged.

  According to the sintering machine of this configuration, in the section where the sintering pallet is transported from the ignition furnace to the exhausting section, water spraying that sprays water on the sintering raw material layer in the sintering pallet And a liquid fuel spraying means for spraying liquid fuel to the sintered raw material layer, and the liquid fuel spraying means is disposed closer to the ore discharge portion than the water spraying means. Therefore, after spraying water on the sintering raw material layer in the sintering pallet, the liquid fuel is sprayed. Therefore, when the liquid fuel is sprayed, the temperature of the surface layer portion of the sintered raw material layer is lowered, so that the liquid fuel may ignite and burn before reaching the sintered raw material layer. It is suppressed. Further, even when a fire type comes out of the ignition furnace, the water spray means prevents the fire type from coming into contact with the liquid fuel. Thus, according to the sintering machine of the present invention, the liquid fuel can be prevented from inadvertently burning above the sintering material layer, and the liquid fuel is reliably combusted in the sintering material layer. It becomes possible to make it. Thereby, the surface layer part of the sintering raw material layer can be sufficiently sintered, and the production efficiency of the sintered ore can be greatly improved.

The water spraying means includes a plurality of water spray nozzles in the width direction of the sintering pallet, and the liquid fuel spraying means includes a plurality of liquid fuel spray nozzles in the width direction of the sintering pallet. Is preferred.
In this case, water and liquid fuel can be uniformly sprayed in the width direction of the sintered raw material layer, and the liquid fuel can be burned uniformly.

  Thus, according to the present invention, it is possible to efficiently increase the temperature of the surface layer portion of the sintering raw material layer, and to improve the production yield of the sintered ore and the sintering method. It becomes possible to provide a kneading machine.

It is a schematic explanatory drawing of the sintering machine which is one Embodiment of this invention. It is a partial top view of the sintering machine shown in FIG. It is XX sectional drawing in FIG. It is YY sectional drawing in FIG. It is a graph which shows the result of an Example.

  Hereinafter, a method for producing a sintered ore according to an embodiment of the present invention and a downward suction type sintering machine (dwightroid type sintering machine) suitable for the method for producing the sintered ore will be described with reference to the accompanying drawings. To explain.

The sintering machine 10 according to the present embodiment includes a pair of sprockets 11A and 11B, a rail part 12 connecting the sprockets 11A and 11B, and a plurality of sintered pallet carriages 13 conveyed along the rail part 12, A floor hopper 14 for supplying a sintering raw material to the bottom surface of the sintering pallet carriage 13 to form a floor layer, and a raw material device for forming a sintering raw material layer M by filling the flooring layer with a sintering raw material The inlet 15, the ignition furnace 16 arranged above the conveyed sintering pallet carriage 13, the lower suction part 17 located on the lower side of the sintering pallet carriage 13, and the obtained sinter cake S are sintered. And an excavation part 18 for excavation from the pallet carriage 13.
The sintering pallet carriage 13 is provided with a support stand 13A for supporting the sinter cake S formed on the surface layer portion of the sintering raw material layer M in the sintering process.

  A plurality of sintered pallet carts 13 are connected endlessly, and the plurality of sintered pallet carts 13 are transported in the transport direction Z along the rail portion 12 between the pair of sprockets 11A and 11B. A floor hopper 14, a raw material charging portion 15, an ignition furnace 16, a lower suction portion 17, and an ore discharging portion 18 are provided in this order from one sprocket 11A side. Here, the discharge portion 18 is configured such that when the sintered pallet carriage 13 is tilted at the other sprocket 11B, the sinter cake S in the sintered pallet carriage 13 is discharged to the outside. Yes. In addition, the excavation section 18 is provided with a crusher 18A that crushes the sinter cake S that has been excavated, and a crushing guide 18B that guides the sinter cake S to the crusher 18A.

In the sintering machine 10, in the section from the ignition furnace 16 to the discharge unit 18, water spraying means 20 for spraying water on the sintering raw material layer M in the sintering pallet carriage 13, and a liquid Liquid fuel spraying means 30 for spraying fuel is provided. As shown in FIGS. 1 and 2, the water spraying means 20 is provided on the ignition furnace 16 side, and the liquid fuel spraying means 30 is disposed on the side of the discharge portion 18 from the water spraying means 20. is there.
Here, in this embodiment, as shown in FIG. 2, the distance L1 between the ignition furnace 16 and the water spraying means 20 is set within a range of 5 m ≦ L1 ≦ 20 m, and the ignition furnace 16 and the liquid The distance L2 from the fuel spraying means 30 is set within a range of 6 m ≦ L2 ≦ 21 m.

  As shown in FIGS. 1 to 3, the water spraying means 20 is connected to a water supply pipe 21 connected to a water supply tank 25, and is connected to the water supply pipe 21 and spans above the sintering pallet carriage 13. A water supply header pipe 22 and a water spray nozzle 23 connected to the water supply header pipe 22 are provided. In this embodiment, as shown in FIGS. 1 and 2, the two water supply header pipes 22 are arranged at intervals in the transport direction Z of the sintered pallet carriage 13. Further, as shown in FIG. 3, ten water spray nozzles 23 are arranged in parallel in one water supply header pipe 22 in the width direction of the sintering pallet carriage 13. It is set as the structure which spreads water over the whole width direction of the raw material layer M. The water spray nozzle 23 is a so-called full cone spray nozzle.

  As shown in FIGS. 1, 2, and 4, the liquid fuel spraying means 30 includes a liquid fuel supply pipe 31 connected to the liquid fuel supply tank 35, a liquid pallet supply pipe 31, and a sintering pallet. A liquid fuel supply header pipe 32 spanned above the carriage 13 and a liquid fuel spray nozzle 33 connected to the liquid fuel supply header pipe 32 are provided. In the present embodiment, as shown in FIGS. 1 and 2, six liquid fuel supply header pipes 32 are arranged at intervals in the transport direction Z of the sintered pallet carriage 13. In addition, as shown in FIG. 4, eight liquid fuel spray nozzles 33 are juxtaposed in one liquid fuel supply header pipe 32 in the width direction of the sintering pallet carriage 13. The liquid fuel is spread over the entire width direction of the sintering material layer M. The liquid fuel spray nozzle 33 is a so-called full cone spray nozzle.

  The liquid fuel used in the present embodiment is an alcohol having a hydroxyl group or an organic compound composed of one or more of hydrocarbons containing an oxygen atom in a chemical structural formula. Specific examples include alcohols, organic compounds having a carbosyl group, organic compounds having an aldehyde group, and organic compounds containing an ether bond. Moreover, you may use the mixture of these organic compounds as a liquid fuel. The liquid fuel to be used preferably has a melting point of −130 ° C. or higher and a boiling point of 180 ° C. or lower from the viewpoint of handling. An example of usable organic compounds is shown in Table 1.

In the sintering machine 10 configured as described above, sintered ore is manufactured as follows.
First, as shown in FIG. 1, the calcined ore is supplied from the floor hopper 14 to the sintered pallet carriage 13 conveyed along the rail portion 12, and the floor layer is formed on the bottom surface of the sintered pallet truck 13. Form.
Further, a sintered raw material in which an iron-containing raw material, an auxiliary raw material, and a solid fuel (coke) are blended is supplied from the raw material charging unit 15 to form a sintered raw material layer M.

The sintering pallet carriage 13 on which the sintering material layer M is formed is conveyed in the conveying direction Z, and is ignited by solid fuel (coke) located in the surface layer portion of the sintering material layer M in the ignition furnace 16.
While the sintering pallet carriage 13 moves from the ignition furnace 16 to the discharge section 18, the sintering pallet carriage 13 is sucked with respect to the sintering pallet carriage 13 from the upper side of the sintering raw material layer M downward. Sinter cake S is manufactured by moving the combustion zone of solid fuel (coke) and proceeding with sintering.

Then, water is sprayed by the water spraying means 20 on the surface layer portion of the sintering raw material layer M in the sintering pallet carriage 13 carried out from the ignition furnace 16. The amount of water sprayed from the water spraying means 20 is adjusted so that the surface temperature of the sintering material layer M is lower than the ignition point of the liquid fuel to be used. In this embodiment, ethanol (ignition point 363 ° C.) is used as the liquid fuel, and the amount of water sprayed by the water spraying means 20 is 1.0 L / min / m ² or more and 6.0 L / min / m ² or less. It is set within the range.
In the present embodiment, the water spraying means 20 includes a plurality of (two) water supply header pipes 22 arranged at intervals in the transport direction Z of the sintering pallet carriage 13 and one water supply header. Since the water spray nozzle 23 is arranged in parallel with the pipe 22, the water is divided into a plurality of stages (two stages) and sprayed.

  Then, the sintering pallet carriage 13 is further conveyed in the conveying direction Z, and the liquid fuel is distributed to the sintering material layer M in the sintering pallet carriage 13 by the liquid fuel distribution means 30. Then, the sprayed liquid fuel is combusted in the sintering pallet carriage 13, the surface temperature of the sintering raw material layer M rises, and the sintering proceeds sufficiently even in the surface layer portion of the sintering raw material layer M. It will be.

  The sinter cake S obtained in this way is discharged from the sintering pallet carriage 13 in the discharge section 18, guided to the crusher 18A by the crushing guide 18B, crushed in the crusher 18A, and about 20 mm in particle size. Sintered ore is produced.

  According to the sintered ore manufacturing method and the sintering machine 10 according to the present embodiment configured as described above, the sintering raw material layer M in the sintering pallet carriage 13 carried out from the ignition furnace 16 is used. Since the water spraying means 20 for spraying water and the liquid fuel spraying means 30 for spraying the liquid fuel to the sintered raw material layer M sprayed with the water by the water spraying means 20 are provided. In the state where the temperature of the surface layer portion of the sintering raw material layer M is lowered by the water spraying by the liquid 20, the liquid fuel is sprayed to the sintering raw material layer M. Therefore, it can be suppressed that the liquid fuel ignites and burns before reaching the sintering material layer M. Furthermore, even when a fire type comes out of the ignition furnace 16, it is possible to prevent the fire type from coming into contact with the liquid fuel by the water spraying means 20.

  Thus, the liquid fuel can be prevented from inadvertently burning before reaching the surface layer portion of the sintering material layer M, and the liquid fuel can be combusted in the surface layer portion of the sintering material layer M. Become. As a result, the heat from the combustion is efficiently transferred to the sintering material layer M, the surface layer portion of the sintering material layer M can be sufficiently sintered, and the production efficiency of sintered ore is greatly improved. Can be made.

Further, the amount of water sprayed by the water spraying means 20 is adjusted so that the surface temperature of the sintering material layer M is lower than the ignition point of the liquid fuel. Specifically, ethanol (ignition point 363) is used as the liquid fuel. ) And the amount of water sprayed is set within the range of 1.0 L / min / m ² or more and 6.0 L / min / m ² or less, so that the sintering after passing through the water spraying means 20 The surface temperature of the raw material layer M becomes sufficiently low, and the liquid fuel can be reliably prevented from igniting and burning above the sintered raw material layer M.

  Further, the water spraying means 20 includes a plurality (two) of water supply header pipes 22 arranged at intervals in the transport direction Z of the sintering pallet carriage 13 and sprays water on one water supply header pipe 22. Since the nozzles 23 are arranged in parallel, and the water is divided into a plurality of stages (two stages) and sprayed, even if the amount of water sprayed is large, this large amount of water is separated into a plurality of stages. Can be divided and sprayed, and there is no fear of extinguishing the combustion zone in the sintering material layer M.

  In addition, an alcohol having a hydroxyl group or an organic compound composed of one or more of hydrocarbons containing an oxygen atom in the chemical structural formula is used as the liquid fuel. Specifically, ethanol is used as the liquid fuel. Since (ignition point 363 ° C.) is used, it can be sufficiently burned even under a low air ratio, and can be burned efficiently in the sintering material layer M.

Further, the water spraying means 20 includes a water supply header pipe 22 that extends over the sintered pallet carriage 13 to be conveyed, and a water spray nozzle 23 connected to the water supply header pipe 22. Since the plurality (10) of water spray nozzles 23 are arranged in parallel in the width direction of the sintering pallet carriage 13, water can be sprayed uniformly in the width direction of the sintering raw material layer M.
Similarly, the liquid fuel spraying means 30 includes a liquid fuel supply header pipe 32 spanned above the sintered pallet carriage 13 being conveyed, and a liquid fuel spray nozzle 33 connected to the liquid fuel supply header pipe 32. , And a plurality (eight) of liquid fuel spray nozzles 33 are juxtaposed in the width direction of the sintering pallet carriage 13, so that the liquid fuel is uniformly sprayed in the width direction of the sintering material layer M. Can do.

  Further, in the present embodiment, since the water spraying means 20 is disposed between the ignition furnace 16 and the liquid fuel spraying means 30, as described above, ignition by fire types from the ignition furnace 16 is prevented. It becomes possible. Therefore, it is not necessary to make the distance between the ignition furnace 16 and the liquid fuel spraying means 30 longer than necessary. Specifically, the distance L1 between the ignition furnace 16 and the water spraying means 20 is set within a range of 5 m ≦ L1 ≦ 20 m, and the distance L2 between the ignition furnace 16 and the liquid fuel spraying means 30 is 6 m ≦ It can be set within a range of L2 ≦ 21 m, and the liquid fuel can be dispersed in a wide section.

As mentioned above, although the manufacturing method and sintering machine of the sintered ore which are embodiment of this invention were demonstrated, this invention is not limited to this, In the range which does not deviate from the technical idea of the invention, it can change suitably. It is.
For example, although it demonstrated as what manufactures a sintered ore using the downward suction type sintering machine shown in FIG. 1, it is not limited to what was illustrated and you may change a design suitably.

In addition, the water spraying means has two water supply header pipes and has been described as a structure in which water is divided into two stages and sprayed. However, the present invention is not limited to this and may be one stage or three or more stages. It may be.
Similarly, the liquid fuel spraying means has six liquid fuel supply header pipes, and the liquid fuel is divided into six stages and sprayed. However, the present invention is not limited to this. Any number of stages may be used.
Furthermore, the section for spraying water and the section for spraying liquid fuel are not limited to the present embodiment, and can be set to any section from the ignition furnace to the discharge section.

The result of the confirmation experiment conducted to confirm the effect of the present invention will be described.
The sintered ore was manufactured using the downward suction-type sintering machine described in the embodiment. The sintering machine had a sintering area of 600 m ² (the width of the sintering pallet truck was 5 m and the distance from the ignition furnace to the discharge portion was 120 m). The height of the sintering raw material layer was 600 mm.

In the comparative example, in the sintering machine shown in FIGS. 1 to 4, the liquid fuel was sprayed from the liquid fuel spraying means without spraying water from the water spraying means.
In Invention Examples 1 and 2, in the sintering machine shown in FIGS. 1 to 4, water was sprayed from the water spraying means and liquid fuel was sprayed from the liquid fuel spraying means.
The operation was carried out for 6 hours, and the number of times the liquid fuel was ignited and the average surface temperature of the sintered raw material layer were calculated. In addition, about the frequency | count of ignition, it evaluated by the ignition frequency index | exponent which set the comparative example to 1. Experimental conditions and results are shown in Table 2 and FIG.

As shown in Table 2 and FIG. 5, in the comparative example in which water was not dispersed, the average surface temperature of the sintered raw material layer exceeded 400 ° C., and the ignition point of ethanol as a liquid fuel (363 ° C.) It was the above and it was in the state which is easy to catch fire.
On the other hand, in Invention Examples 1 and 2 in which water is sprinkled, the average surface temperature of the sintered raw material layer is kept low, and the ignition frequency is also lower than in the comparative example. In particular, in Example 2 of the present invention in which the amount of water sprayed was 4.3 L / min / m ² , no ignition was observed.
Therefore, according to the example of the present invention, even when the liquid fuel is sprayed on the sintering material layer, the liquid fuel is not inadvertently burned, and the surface layer portion of the sintering material layer is sufficiently sintered. It was confirmed that it could be done. Thereby, the surface layer part of a sinter cake can also be used as a sintered ore, and it becomes possible to improve the manufacturing efficiency and manufacturing yield of a sintered ore.

10 Sintering machine 13 Sintering pallet truck (sintering pallet)
16 Ignition furnace 18 Exhaust section 20 Water spraying means 23 Water spraying nozzle 30 Liquid fuel spraying means 33 Liquid fuel spraying nozzle

Claims (6)

A method for producing a sintered ore using a downward suction type sintering machine having a circulation type sintering pallet to sinter a sintering raw material to produce a sintered ore,
A charging step of charging the sintered pallet with the sintered raw material in which an iron-containing raw material, an auxiliary raw material and a solid fuel are blended to form a sintered raw material layer;
An ignition step of transferring the sintering pallet formed with the sintering raw material layer to an ignition furnace, and igniting a solid fuel located in a surface layer portion of the sintering raw material layer in the sintering pallet in the ignition furnace;
By sucking air from the lower side of the sintering pallet carried out from the ignition furnace, the combustion zone is moved from the upper side to the lower side of the sintering raw material layer, and the sintering raw material layer is sintered. A sintering process to produce a sinter cake;
A discharge step of discharging the sinter cake from the sintered pallet transferred to the discharge portion,
In the section in which the sintered pallet is transported from the ignition furnace to the discharge section,
A water spraying step of spraying water on the sintering raw material layer in the sintering pallet;
A liquid fuel spraying step of spraying liquid fuel to the sintering raw material layer in the sintering pallet in which water is sprayed;
The manufacturing method of the sintered ore characterized by including.   2. The sintered ore according to claim 1, wherein in the water spraying step, a water spray amount is adjusted so that a surface temperature of the sintering raw material layer is lower than an ignition point of the liquid fuel. Manufacturing method.   The said liquid fuel is an organic compound which consists of 1 type, or 2 or more types of the hydrocarbon which contains the alcohol which has an oxygen atom in the alcohol or chemical structure which has a hydroxyl group. Method for producing sintered ore.   4. The method for producing a sintered ore according to claim 1, wherein in the water spraying step, water is sprayed in a plurality of stages. A plurality of sintering pallets that circulate, a raw material charging portion that charges the sintering raw material into the sintering pallet, and a solid fuel that is located in the surface layer portion of the sintering raw material layer formed in the sintering pallet An ignition furnace for igniting, a lower suction part for sucking air from the lower side of the sintering pallet, and an exhausting part for discharging the sintered cake obtained by sintering the sintering raw material layer from the sintering pallet A lower suction type sintering machine comprising:
In the section in which the sintered pallet is transported from the ignition furnace to the discharge section,
Water spraying means for spraying water to the sintering raw material layer in the sintering pallet;
A liquid fuel spraying means for spraying liquid fuel to the sintering raw material layer in the sintering pallet;
The sintering machine according to claim 1, wherein the liquid fuel spraying means is disposed closer to the draining part than the water spraying means.   The water spraying means includes a plurality of water spray nozzles in the width direction of the sintering pallet, and the liquid fuel spraying means includes a plurality of liquid fuel spray nozzles in the width direction of the sintering pallet. The sintering machine according to claim 5.

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