TW201028482A - Process for producing sintered ore and sintering apparatus - Google Patents

Abstract

A process for sintered-ore production in which high-quality sintered ore having high strength can be safely produced in a high yield with a sintering apparatus of a downward suction type; and the sintering apparatus. The process for sintered-ore production comprises: placing a raw material to be sintered comprising fine ore and a carbon material, on a circulating pallet (8) to form a raw-material layer (9); igniting the carbon material of the raw-material layer in an ignition furnace; and sucking air with a wind box disposed under the pallet to thereby produce sintered ore. After the raw-material layer (9) has been ignited in the ignition furnace, a liquid fuel is atomized to a particle size of 100 μm or smaller and supplied to over the raw-material layer (9), and the atomized liquid fuel is supplied from over the raw-material layer (9) into the raw-material layer (9) after having been diluted at least to the lower limit of ordinary-temperature combustion concentrations. The sintering apparatus has, disposed downstream from the ignition furnace, a liquid-fuel injector which injects the liquid fuel over the raw-material layer.

Description

201028482 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a method for producing a sintered ore sintered sinter and a sintering machine. [Prior Art] The sinter of the main raw material of the kiln iron making process is generally manufactured by the steps shown in Fig. 15. The raw materials of the sinter are as follows: iron powder ore, iron powder in the iron ore, sinter ore (recycled ore), limestone and dolomite and other Ca-based deuterium 10 raw materials; or raw reduction auxiliary; or coke Fans and so on. These raw materials are each cut from the plurality of hoppers 1 on a conveyor belt in a predetermined ratio. The cut raw material is conveniently added with a suitable water by a tumbler mixer 2, a rotary t3, etc., and mixed and granulated to form a sintered raw material having a quasiparticle of an average particle diameter of 3 〇 6 . On the other hand, the ore block of _(4) is cut from the bottoming hopper 4, and a bottom layer is formed on the sieve of the sintering machine pallet 8. The sintering raw material is formed from the receiving tank 5 disposed on the sintering machine, through the cylindrical feeding device 6 and the cutting chute 7, and is mounted on the bottom layer of the annular moving sintering machine pallet 8, and is also formed. The sintered raw material of the sintered bed is charged into the layer 9. The thickness of the loading layer (height) is usually about 400 to 800 mm. Then, the carbon material in the surface layer of the layer 9 is ignited by the ignition furnace 10' provided above the loading layer 9, and the air is pumped downward through the bellows 11 disposed under the pallet 8. The carbon material in the charged layer is sequentially burned, and the sintered raw material is burned and melted by the heat of combustion generated at this time to obtain a sintered cake. The sintered cake obtained therefrom is then crushed and sieved to form a finished sintered ore composed of agglomerates of 098141326 3 201028482 of 5.0 mm or more and recovered. In the above manufacturing process, first, the surface layer of the packed bed is ignited by the ignition furnace 10. The ignited carbon material in the charging layer will continue to burn with a certain amount of air sucked from the upper layer of the loading layer toward the lower layer by the bellows, and the burning belt will rapidly move downward and forward with the movement of the pallet 8. (downstream side). As the combustion proceeds, the moisture contained in the sintered raw material particles charged in the layer is vaporized by the heat generated by the combustion of the carbon material, and is sucked downward, and concentrated in the lower sintering raw material whose temperature has not risen. And form a wet belt. If the water concentration is more than a certain level, the voids between the raw material particles belonging to the suction gas flow path are buried by the water, resulting in an increase in ventilation resistance. Further, the molten portion necessary for the sintering reaction in the combustion zone may also be a cause of an increase in the ventilation resistance. The sintering machine throughput (t/hr) is generally determined by the sintering productivity (t/hr · m2) X sintering machine area (m2). Namely, the sintering machine throughput varies depending on, for example, the machine width and length of the sintering machine, the thickness of the raw material accumulation layer (loading layer thickness), the overall density of the sintered raw material, the sintering (combustion) time, the yield, and the like. Therefore, in order to increase the production amount of the sintered ore, it is considered to be effective, for example, to improve the air permeability (pressure loss) of the packed bed, to shorten the sintering time, or to increase the cold rolling strength of the sintered cake before the crushing, and to improve the yield. Figure 16 is a front view of a burning belt moving in a loading layer having a thickness of 6 mm, placed at a position of about 4 〇〇 nmi (200 mm below the surface of the loading layer) of the loading layer. Pressure loss and temperature distribution within the layer. The pressure loss distribution at this time will be about 60% in the wet zone and about 40% in the combustion and melting zone. 098141326 4 201028482 Figure 17 shows the temperature distribution in the produced layer during high production and low production (when the plate moving speed is slower and slower). It is kept at a fine 1 of the starting particle melting. When the temperature is higher than c (hereinafter referred to as "high temperature range holding time"), the case of low production is expressed by tl, and the high production condition with emphasis on productivity is expressed by t2. In high production, because the movement speed of the pallet is relatively fast, the high temperature domain retention time is shorter than that of the low production. If the holding time in the high temperature range is shortened, it is easy to become insufficiently burnt, resulting in a decrease in the cold rolling strength of the sintered ore and a decrease in the yield. Therefore, in order to improve the productivity of high-strength sinter, not only short-time sintering, but also any means to increase the strength of the sintered cake (ie, the strength of the sinter cold rolling) and to increase and maintain the yield are necessary. In addition, the index indicating the cold rolling strength of the sintered ore is generally SI (sludge index) and TI (drum index). Fig. 18(a) shows the sintering process in the charging layer on the sintering machine pallet, and Fig. 18(b) shows the temperature distribution during the sintering process in the layer (heating enthalpy mode). (c) shows the yield distribution of the sintered cake. As is apparent from Fig. 18(b), the upper portion of the packed layer is harder to rise than the lower portion, and the holding time in the high temperature region is also shorter. Therefore, the combustion-melting reaction (sintering reaction) in the upper portion of the packed bed is insufficient, and the strength of the sintered cake is lowered. Therefore, as shown in Fig. 18 (c), the cause of the decrease in yield and the decrease in productivity are caused. In view of this kind of problem, there is a proposal for the long-term and south-temperature maintenance of the upper layer of the loading layer. For example, Patent Document 1 discloses that, after the ignition of the intrusion layer, the gas fuel is injected onto the charging layer, 098141326 5 201028482. However, the above-mentioned techniques are not clear on the types of gaseous fuels (flammable gases), and even high-concentration gases can be used even in barreled gas (LPG) or natural gas (LNG). Moreover, when the flammable gas is blown in, the amount of carbon material is not reduced, so the sintered layer will have a high temperature of more than 138 (rc). Therefore, this technology cannot enjoy the improvement of sufficient cold rolling strength and yield. Moreover, - when the flammable gas is ejected immediately after the ignition furnace, the risk of fire caused by the combustion of the flammable gas is increased due to the combustion of the flammable gas, which is a technique that lacks reality and has not yet reached practical use. ◎ Further, Patent Document 2 discloses a technique of adding a flammable gas to the air sucked into the charging layer after ignition of the charging layer. After ignition, it is preferably about 1 to 1 Torr. Supply in a minute or so, but there is still a red hot state sinter in the surface layer immediately after ignition of the ignition furnace. According to the supply method, there is a risk of fire caused by the combustion of flammable gas, and the detailed description is small, but the specific description is small. Sintered sintered belt has no effect even if it burns combustible gas. If it is burned in the sintering zone, it will cause temperature rise due to combustion gas and thermal expansion. When the ventilating property is deteriorated, the productivity tends to decrease, and when the flammable gas is blown in, the amount of the carbon material is not reduced, so that the sintered layer will have a high temperature exceeding 138 (rc). However, it has not been able to enjoy the effect of improving the full cold rolling strength and the yield improvement, so it has not been put into practical use until now. Patent Document 3 discloses that in order to form a crucible dish in the layer of the sintered raw material, it is placed on the layer. A cover body is provided, and through the cover body, a mixed gas with air or 098141326 6 201028482 coke oven gas is blown in a position immediately after the ignition furnace. However, the technique is also due to the melting of the sintered layer. If the temperature of the belt exceeds the high temperature of the measurement c, the effect of blowing the coke oven gas will not be obtained, and the combustible gas mixture will ignite in the space of the sintering bed, and there is no danger of causing a fire. Patent Document 4 discloses a method in which a low-spot solvent, a carbonaceous material, or a combustible gas is simultaneously blown in a position immediately after the ignition furnace. However, the method is also because When the flame is blown in the state where the flame remains on the surface, the risk of causing a fire in the space of the sintering bed is high, and the width of the sintered belt cannot be sufficiently thickened (about 15 mm or less), so that it cannot be filled. The effect of blowing a combustible gas, and because there are a lot of low-melting-point solvents, excessive melting occurs in the upper portion, and pores that become air flow paths are blocked, resulting in deterioration of air permeability and productivity. The technology has not been put into practical use so far. According to the above description, the conventional technologies proposed so far have potential problems of practical use, and the development of flammable gas blowing technology that can be implemented is expected. In order to solve the above problems, the applicant has proposed in Patent Document 5: * From the sintering raw material deposited on the pallet of the sintering machine, a variety of gaseous fuels which are supplied "diluted" to a concentration lower than the lower limit of combustion, and A method of introducing into the loading layer and combusting to adjust one or both of the highest reaching temperature and the high temperature holding time in the loading layer. [Patent Document 1] Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. [Patent Document 4] Japanese Patent Laid-Open No. Hei 5-311257 (Patent Document 5) WO2007-052776 (Summary of the Invention) (Problems to be Solved by the Invention) The technique of the above Patent Document 5 is based on the lower suction belt. In a sintering machine, a gaseous fuel which is diluted to a predetermined concentration is supplied (introduced) into a charging layer, and a gaseous fuel supply which is burned at a target position in the layer is appropriately controlled, and the sintering raw material can be appropriately controlled. The highest temperature reached during combustion and the holding time in the high temperature range, and even in the upper layer of the loading layer which is likely to cause a decrease in the strength of the cold rolling of the sintered ore due to insufficient heat, even any part below the middle layer of the layer can be improved. The operation of sinter strength. However, when the above-described gas fuel supply sintering operation is performed, a high temperature portion such as a cracked portion of the sintering bed or the cake may become a fire, and the gas fuel may be backfired, and there is a possibility that the gas fuel is burned (ignition). If the sintering operation is continued in such a igniting state (the explosion problem is another level problem), it is not only impossible to supply the gaseous fuel to the charging layer, but also the oxygen-deficient atmosphere due to the consumption of oxygen due to the combustion of the gaseous fuel. Is supplied (imported) into the load layer. The result 'can not only control the maximum temperature of arrival and the time of the high temperature range, but also cause combustion, which leads to a decrease in the strength of the sintered ore, which reduces the yield and productivity, and thus has a significant adverse effect on the sintering operation. 098141326 201028482 The present invention has been made in view of the problems of the above-described conventional examples, and aims to provide a sintered ore which can produce high-strength and high-quality sintered ore in a low-yield and safe manner in a lower suction belt sintering machine. Manufacturing method and sintering machine. (Means for Solving the Problem) In order to achieve the above object, a method for producing a sintered ore provided by the present invention includes a charging step of forming a charging layer, an ignition step, and a liquid fuel supply step of supplying the charging layer. And sintering step.装入 The loading step is to load a sintered raw material containing fine ore and charcoal on a circulating moving pallet to form a packed layer. The ignition step ignites the carbon material from which the packed layer has been formed using an ignition furnace. The liquid fuel supply step is performed after the ignition, and the liquid fuel atomized to a particle size of 1 ο ο μηη or less is supplied to the loading layer. The sintering step produces a sintered ore by performing air suction by a bellows disposed below the pallet. The finely divided liquid fuel preferably has a particle diameter of 50 μm or less and ❹2 〇 μη or more. Preferably, the microparticulated liquid fuel has a concentration below a lower concentration of combustion. The above concentration is preferably 75% or less and 1% or more of the lower limit of the combustion limit. The above concentration is preferably 25% or less and 4% or more of the lower limit of the combustion concentration. The liquid fuel supply step is preferably as follows: (Α) The liquid fuel that has been micronized to a particle size of 1 μm or less is supplied to the packed bed and supplied to the lower limit of the lower limit of combustion at room temperature. Loaded into the layer. 098141326 201028482 (B) A liquid fuel that has been micronized to a particle size of 粒μηι is sprayed toward the upper side of the packed layer. (C) The liquid fuel is mixed in a compressed gas and atomized, and then sprayed onto the packed bed. The compressed gas system is a gas containing at least one of nitrogen, carbon dioxide, and water vapor having a flame-retardant property as a main component. The liquid fuel is preferably at least one selected from the group consisting of petroleum-based liquid fuels, alcohol-based liquid fuels, ether-based liquid fuels, and other hydrocarbon-based compound liquid fuels. The above petroleum-based liquid fuel is preferably selected from the group consisting of kerosene, light oil and heavy oil. The above alcohol liquid fuel is preferably selected from the group consisting of methanol, ethanol and diethanol. The above other hydrocarbon-based compound-based liquid fuels are selected from the group consisting of pentane, hexane, heptane, octane, decane, decane, benzene, and acetone. The liquid fuel is preferably supplied in any of the following positions: (4) The micronized liquid fuel is supplied during the period from the completion of the production of the manned layer of the silk layer to the completion of the sintering. (b) Supply of micronized liquid fuel in a region where the burning and county belts are more than 15 mm thick. (4) After the front line of the combustion reaches the position of the face under the surface layer, the micro-granulated liquid fuel is supplied. Furthermore, the sintering machine provided by the present invention is provided with: a pallet, a raw material for the t device 'ignition furnace, a liquid_mouth device and a bellows; and the pallet is cyclically moved; the raw material is for riding Attaching a sintered raw material containing fine ore 098141326 201028482 and carbon material to the pallet to form an ejecting layer; the ignition furnace is igniting the carbon material of the sintered (four) towel on the pallet; rhyme_injection device The utility model is disposed on the downstream side of the ignition furnace, and atomizes the liquid fuel to a particle diameter l_n or less and reduces the injection above the human layer; the wind box performs air suction toward the lower side of the tray. Preferably, the liquid fuel injection device is provided with: a compressed gas supply source, a liquid fuel supply source, and a spray mechanism; the spray mechanism is a compressed gas from the above-mentioned compressed medium supply source and the liquid fuel supply source The liquid fuel is tilted, and after being replenished, the redant on the loading layer is sprayed in the horizontal direction. In the above compression, the gas is preferably a gas containing at least one of a flame-retardant nitrogen, a sulphur dioxide, and a water vapor. Preferably, the spray mechanism includes a transfer pipe, a communication pipe, and a cutting nozzle; and the transfer pipe transports the mixed fluid of the compressed gas and the liquid fuel to a downstream side and has a downward slope; the communication pipe is connected The lower side of the transfer pipe is formed such that the discharge π which can eject the liquid fuel formed under the communication pipe in the horizontal direction is inclined downward. Preferably, the county fuel injection device has a preheating mechanism that preheats the material when the viscosity of the liquid fuel is high. The liquid fuel is preferably at least selected from the group consisting of petroleum-based liquid fuels, alcohol-based liquid fuels, liquid fuels, and other hydrocarbon-based compound liquid fuels which are in a liquid state near normal temperature. (Effect of the Invention) 098141326 201028482 According to the method for producing a sintered ore according to the present invention, since the liquid fuel is atomized to a particle diameter of 100 μm or less and supplied to the upper side of the charging layer on the downstream side of the ignition furnace, the charging is carried out from the loading layer. The layer is supplied in a state of being diluted to a concentration lower than the lower limit of combustion at normal temperature, so that the liquid fuel is not burned on the packed bed by the air suction by the bellows, and the upper layer of the layer is charged. After the chemical, it reaches the combustion and melting zone of the lower layer and burns according to the gaseous fuel, as in the case of using gaseous fuel, by the supply position of the micronized liquid fuel, the highest temperature reached during combustion, and the high temperature range. Time control 'g is insufficient to burn, resulting in a decrease in the strength of the sinter cold rolling. Not only the upper part of the layer but also any part below the middle layer of the layer can be used to increase the strength of the sinter. Here, if the particle diameter of the liquid fuel exceeds ΙΟΟμιη, a residual portion will occur in the surface layer portion of the layer, and burning in the surface portion will result in a lot of waste, which will impair the effect of prolonging the holding time in the high temperature region. If it is below ΙΟΟμηη, it will suppress the combustion at the upper part and the surface layer of the loading layer - it will be vaporized by the guided person I layer (10), and pumped to the lower layer, and reaches the combustion and melting zone. The gaseous fuel is burned. Here, the particle size of the micronized liquid fuel is preferably selected to be 5 Å or less and 2 Å or more. The particle size 敎 is 5 or less, and the atomized liquid fuel can be surely introduced into the human layer. Burning • in the smelting zone. The smaller the particle size of the microparticulated liquid material, the better, but the finer the granules are, the more the amount of ruthenium is reduced. Therefore, it is considered that the amount of production necessary for prolonging the holding time in the high temperature range is preferably selected. Up to 2〇μηι. 098141326 12 201028482 According to the sintering machine of the present invention, since the liquid fuel injection device that atomizes the liquid fuel and sprays in the horizontal direction is provided above the charging layer on the downstream side of the ignition furnace, the liquid fuel injection device is used to eject the liquid fuel injection device. The micronized liquid fuel is dispersed uniformly on the loading layer, and the uniformly dispersed micronized liquid fuel will pass through the bellows and be drawn into the loading layer. Therefore, as the liquid fuel is volatilized in the charging layer and used according to the gaseous fuel, the supply position of the micronized liquid fuel, the highest temperature at the time of combustion, and the holding time of the high temperature range are controlled, resulting in insufficient combustion. The cold rolling strength of the sintered ore is reduced, and not only the upper portion of the layer is charged, but also the operation for increasing the strength of the sintered ore can be performed at any portion below the middle layer of the layer. Moreover, by atomizing the liquid fuel and spraying it onto the charging layer, there is no concern such as igniting when the liquid fuel is directly used, and the micronized liquid can be safely and stably performed. The fuel is introduced into the raw material into the layer. Further, as the compressed gas for atomizing the liquid fuel, the combustion on the charging layer can be suppressed by using any of the flame-retarding nitrogen, carbon dioxide, and water vapor. [Embodiment] A method for producing a sintered ore using the sintering machine of the present invention is constituted by the following steps: a charging step, an ignition step, a liquid fuel supply step, and a sintering step. In the manufacturing method, the charging step is performed on a pallet which is circulated and moved, and a sintering raw material containing fine ore and carbon material is charged, and a sintering raw material charging layer is formed on the pallet; the ignition step is used. Ignition furnace, the step of igniting the carbon material on the surface of the table 098141326 13 201028482. Further, the liquid fuel supply step is a step of spraying the liquid fuel atomized to 1 μm or less from the liquid fuel injection device toward the loading layer; the sintering step is performed by using the wind disposed under the pallet The suction force of the tank sucks the above-mentioned micronized liquid fuel and air into the charging layer, so that the micronized liquid fuel is burned in the charging layer while being pumped to the loading layer The inside air is a step of burning the carbon material in the charging layer and sintering the sintered raw material by the heat generated by the combustion to form a sintered cake. In the present invention, the liquid fuel which is atomized above the charging layer is sprayed into the atmosphere on the downstream side of the ignition furnace, and the atomized liquid fuel is utilized in the bellows while suppressing the ignition or the like. Air is drawn and volatilized in the loading layer. Fig. 1 is a schematic structural view showing an embodiment of a sintering machine of the present invention. In Fig. 1, as in the conventional example, for example, iron powder ore, iron powder in the ironmaking, sinter sieve, limestone, dolomite and the like, a Ca0-based auxiliary material, and a granulation aid such as a stone ash; And a sintering raw material such as coke powder or anthracite carbon, which is cut out from the plurality of hoppers 1 on the conveyor belt according to a predetermined ratio, and the cut raw materials are mixed with a proper amount of water by using, for example, a rotary mixer 2, a rotary shovel, and mixed and granulated. On the other hand, a sintered raw material having quasiparticles having an average particle diameter of 3.0 to 6.0 mm is formed and stored in the receiving tank 5. On the other hand, an ore block having a predetermined particle size is cut out from the bottoming hopper 4, and a layup layer is formed on the stringer screen of the sintering machine tray 8. 098141326 14 201028482 Then, the sintering raw material is fed from the receiving tank 5 via the drum feeder 6 and the chute 7 into the bottom layer of the ring-shaped movable sintering machine pallet 8 to form a sintering bed. Into layer 9. The loading layer thickness (height) is usually around. Then, the carbon material in the surface layer of the loading layer 9 is ignited by using the setting device 2 above the loading layer 9, and the wire is sucked through the bellows u disposed below the pallet 8 to The carbon material in the charging layer is sequentially burned by this. ❹ Then, a liquid fuel injection device 15 is disposed on the downstream side of the ignition furnace 10, and the liquid fuel is atomized on the upper side of the charging layer 9 and sprayed in a horizontal direction. The liquid fuel (four) radiation device 15 is attached to the ignition furnace. The downstream side of 1G and the combustion/melting zone are carried out in the loading layer 9, and more than one position is arranged at any position in the direction of the pallet, and the liquid fuel mist in the loading layer 9 is supplied, preferably in the opposite direction. The carbon material in the layer 9 is subjected to a position after ignition. The liquid fuel injection squirting device 15 is disposed on the downstream side of the ignition furnace 1 at any position after the combustion front line travels to the surface layer, or a plurality of points, from the point of view of the product of the adjustment target 'The size, position, and number of configurations are determined as described later. As shown in Fig. 2, the liquid fuel injection device 15 has a cover 16 covering the upper portion of the sintering machine pallet 8, and a large opening 17 is provided in the upper portion of the cover 16. In the cover 16, as shown in Figs. 2 and 4, a compressed air supply pipe 21 and a liquid 098141326 201028482 fuel supply pipe 22 are disposed above the loading layer 9 in the conveying direction of the sintering machine pallet 8. Further, the compressed air supply pipe 21 and the liquid fuel supply carrier 22 are held at a predetermined interval in the width direction orthogonal to the direction in which the sintering machine pallet 8 is conveyed, and a plurality of arrays (for example, nine groups) are arranged in parallel. On the lower surface side of each of the compressed air supply piping 21 and the liquid fuel supply piping 22, a spray mechanism 23 is disposed at a predetermined distance in the conveying direction of the sintering machine pallet 8. The spray mechanisms 23 are arranged such that the spray mechanisms 23 adjacent to each other in the width direction of the sintering machine pallet 8 are opposed to each other, and the spray mechanisms are arranged in a staggered manner in the conveying direction of the sintering machine pallet 8. twenty three. Further, the number of sets of the compressed air supply pipe 21 and the liquid fuel supply pipe 22 is not limited to nine groups, and it is preferable to provide a plurality of sets (for example, 3 to 15 sets). Each of the spray mechanisms 23 is composed of a vertical pipe 24, a mixing portion 25, a connecting pipe 26, and a branching spray portion 27, as shown in an enlarged view in Fig. 3 . The vertical pipe 24 is coupled to the lower surface of the compressed gas supply pipe 21. The mixing portion 25 is formed at an intermediate portion of the vertical pipe 24. The connecting pipe 26 connects the mixing portion 25 to the lower surface of the liquid fuel supply pipe 22. The branching injection portion 27 is disposed at the lower end of the vertical pipe 24, and branches into a double-strand shape in the width direction of the sintering machine pallet 8. The branch ejecting unit 27 has two jet nozzle portions 28a and 28b which are symmetrical with respect to the trapezoidal straight tube 24. From the ejection nozzle portions 28a and 28b, the liquid fuel mist 29 atomized to the fine particles of, for example, ΙΟΟμηη or less is ejected in a horizontal direction. Here, the reason why the liquid fuel mist 29 is set to be less than or equal to ΙΟΟμηη, 098141326 16 201028482, if the particle diameter exceeds ΙΟΟμιη, the portion remaining in the surface layer portion of the layer 9 will be generated and will start to burn due to the surface layer portion. This causes a lack of combustion in the loading layer 9 and does not contribute to the prolongation of the high temperature region of the upper and middle layers, resulting in waste. Further, the particle size of the liquid fuel mist 29 is preferably as small as possible, but the amount of the liquid fuel mist 29 is preferably reduced by 50 μm or less and 20 μm or more. When the particle diameter of the liquid fuel mist 29 is 5 μm or less, the burning of the upper portion of the charging layer 9 and the surface layer portion is suppressed, and the cracked portion in the sintered cake formed by the surface layer is formed, or the sintered cake is first vaporized. Further, the cake is sintered in a gas state, and is burned by reaching a combustion/melting zone. Further, when the particle diameter is less than 2 (m), the amount of generation of the liquid fuel mist 29 is reduced, and the introduction of the liquid fuel mist 29 into the charging layer 9 cannot be exhibited, and the effect of maintaining the holding time in the high temperature region is prolonged. Each of the reading nozzle portions 28a and 28b is set to be slightly inclined downward as the center line thereof advances from the vertical pipe 24 toward the front end, and is opened at an angle of, for example, about 85 degrees with respect to the central axis of the vertical matching β pipe 24. By the spray nozzles 4 28a and the shifting; t is a slight downward inclination of the front end, and when the injection of the liquid fuel mist is completed, the liquid fuel mist does not form liquid remaining in the spray nozzle portions 28a and 28b, but will be all The above-mentioned opening angle is preferably from (10) degrees to 90 degrees, more preferably from 45 degrees to 85 degrees. Accordingly, the spray mechanism 23 is arranged in a staggered manner in the conveying direction of the sintering machine tray 8 so that the respective sprays are sprayed. The spray nozzle portion 28a of the mist mechanism 23 and the liquid fuel mist 29 emitted from the nozzle are not shown in Fig. $, and are not sprayed on the board loading layer 9. Then, the sintered cake formed by sintering is used. The suction force of the box, through the loading The surface layer of the layer 9 is introduced into the deep part (lower layer) of the loading layer. 〇❹ The details of the supply of the 21st sheet are shown in detail on the side of the sintering machine, and the side is connected to the lining via the flow meter FC via the control valve vc. The gas supply supply port 31 is connected to the compression reading supply source 32. The compressed gas supply source 32 has a nitrogen, carbon dioxide, water vapor, etc., which is stored in a flame-reducing manner. The gas storage tank 33 used, the gas stored in the storage tank 33 is compressed by the compressor 34 to form a compressed gas, and is stored in the receiving tank from the receiving tank 35 via the compressed gas supply source piping. 31 is supplied to each control valve VC. Here, between the receiving groove 35 and the flow meter Fc, a domain path LM interposed with the control valve VC is provided, and the control side % is bypassed to supply a small flow of compressed air. The bypass flow path LB. The bypass flow path LB causes the compressed gas from the receiving groove 35 to pass through the bypass flow path lb and the flow meter FC in a state where the liquid fuel mist 29 is not ejected from the spray mechanism 23. Supply a small amount of compressed gas to the spray mechanism 23, The injection nozzle portions 28a and 28b of the spray-stop mechanism 23 are clogged. Similarly, the liquid fuel supply pipe 22 is connected to the liquid fuel supply source pipe via the flow meter FF via the control valve VF on the upstream side of the sintering machine tray 8. 36. The liquid fuel supply source pipe 36 is connected to the liquid fuel storage tank 38 belonging to the liquid fuel supply source via the fuel supply pump 37. At 098141326 18 201028482, this 'liquid fuel supply pipe 22, s> iI The source pipes 36 are preferably arranged obliquely so as to be inclined downwardly compared to the arrangement height on the downstream side of the upper Δ, and the liquid is formed in the liquid state at the end of the injection of the smog-like mist 29 The fuel supply pipe 22 has a state in which the Panergy κμ is not left in the supply pipe 36 of the 枓 及 态 。 supply. Liquid fuels are liquids such as kerosene, light oil, heavy oil, etc., or petroleum liquid fuels such as ethanol and sterol; ❹ or hydrazine liquids: at least other hydrocarbon-based liquid fuels. One or more of these are stored in the liquid fuel storage tank 38. Here, the liquid fuel and its characteristics which can be used in the present invention are shown in Table 1 below. [Table 1] Material name specific gravity > 4 Ik Combustion limit ignition temperature (liquid fuel) (153⁄4) ('°C) (VO lower pole ΙΪΙ 1%) Upper limit (ignition temperature) (°〇戊烧~〇7M! 36. 0 1.5 7. 8 284 Burned U·From 4 68. 7 1.2 7. 4 260 Geng 0. 688 98.4 1.2 6. 7 247 Octane.0.707 125.0 1.0 240 Oyster 0.722 150.0 0.8 2. 9 234 癸Hyun 0.734 174 0. 8 5.4 231 Stupid 0.88R 80.1 1.3 7.9 592 Bing Ming 0. 792 56. 6 2. 6 13 561 sterol 0· 7 as 64.4 6.7 36 470 Ethanol 0. 789' 78.3 3.3 19 392 Diacetyl _ 0.714 ' 34.4 1.9 48 185 Kerosene (kerosene) 0.8-0.85 160-320 1.1 6. 0 255 Light oil (diesel) 0.83-0 88 250-350 1.0 6. 0 250 Weight 4 0.86 302- 1.0 7. 0 240 This liquid fuel is subjected to atomization and injection of a liquid fuel mist 29 because the ignition temperature is higher than, for example, blast furnace gas, coke oven gas, blast furnace/coke oven mixed gas, city gas, natural gas, or decane gas, ethane gas. , 098141326 19 201028482 The ignition temperature of any gaseous fuel such as a propane gas, a sulphur gas, or a mixture of these gases will therefore be The loading layer 9 (i.e., the surface layer of the sintered bed) has a higher temperature and is located closer to the inside than the loading layer 9, and has an effect on the temperature expansion of the flat region at the bottom of the burning and smelting zone of the blowing position. Preferably, the ignition temperature is 18 〇t: 〜500 eC. Further, it is preferable to provide a state in which the liquid fuel mist 29 is supplied to the position of the low-yield portion near the left and right side walls 18 of the cover 16. For example, waste oil or the like contains a component which is easy to ignite or has a low ignition temperature, and therefore the present invention is preferably not used. The reason is that a liquid fuel such as waste oil containing a component having a lower ignition temperature or a lower ignition point is preliminarily applied. When it is supplied to the loading layer 9 (i.e., the bed of the sintered raw material), it will be in the upper space of the surface layer of the loading layer 9 or even the surface layer of the loading layer 9 before reaching the vicinity of the burning belt in the loading layer 9. By riding on the combustion, it is not possible to obtain the effect of the present invention for burning in the vicinity of the combustion zone of the charging layer 9, and the effect of maintaining the temperature in the high temperature region maintained in, for example, 1200 C or more is achieved. The reason why the liquid fuel mist 29 is sprayed on the top of the liquid 9 to prolong the holding time of the liquid high temperature region is to prepare the experimental apparatus shown in Fig. 9 (i.e., a vertical tubular test pot with a window made of transparent quartz) (diameter: 150ηπηΦ, height) : 400mmH), the liquid fuel used is sesame oil, which is the same sintered raw material used by the applicant in the sintering plant, that is, the sintered raw material shown in Table 2 below is used to form the packed layer, and the squirting is sprayed. The nozzle mouth is set to be 32 距 mm from the surface of the loading layer, and the powder coke ratio is set to 098141326 20 201028482. When the heat is 5.0% (reference 5.25%), the ignition time is set to 30 seconds, and the suction is set. The force was set to 1200 mmH2 〇, the blowing amount was set to 5.0 ml/min, and the blowing position was set to 30 seconds after ignition to 1/2 portion of the upper layer. Further, the blowing period is set to a period of 1 to 6 minutes after ignition. Here, the sesane oil property of the liquid fuel is 255 ° C, a calorific value of 40.3 kJ / g, and a density of 0.92 g / cm 3 . [Table 2] Proportion of raw material species (mass%) Robe River 9.6 Yandi 23.8 Kalahas Mine 42.6 Limestone 16.6 Vermiculite 2.7 Powder Coke 4.7 The liquid fuel injection test results are shown in Figure 9, without blowing in the liquid fuel. In the (reference) state, the width of the burning zone after passing 5 minutes after ignition is 65 mm, and the heating mode 50 mm downward from the surface of the loading layer rises rapidly after 1 minute after ignition and exceeds 1200 ° C. The state of 1200 保持 is maintained for 33 sec, and then the temperature is lowered. On the other hand, when sesame oil is blown for 1 to 6 minutes after ignition, the width of the combustion zone after 5 minutes after ignition is expanded to 114 mm, and the heating mode 50 mm from the surface of the loading layer is from the ignition. After lmin, it rises sharply and exceeds 1200 °C. 'When it exceeds 120 (82 sec in TC state, 098141326 21 201028482 temperature will gradually decrease the slope. So 'by the blowing of sesame oil, the width of the burning zone can be enlarged. And the heating mode can be set to 82 sec over 1200 hours (the high temperature region time), compared to the case without blowing liquid fuel, the width of the combustion zone; the expansion is about 1.75 times 'the high temperature domain retention time can be Extend about 25 times.

Further, using the same test apparatus, in comparison with the above-described blowing conditions, the combustion belts were compared in three states: a state in which no liquid fuel was blown, a state in which a human linseed oil was blown, and a state in which heavy oil was blown. As shown in Fig. 7 (7), in the state of 7F', compared with the case of non-blowing liquid fuel, the width of the combustion zone can be expanded when the state of blowing human sesame oil is blown, and even in the state of heavy oil blowing, the combustion zone can be expanded even more. width. The properties of each liquid fuel are as described in Table 3. It is assumed that the calorific value (kJ/g) of vegetable oil and sesame oil is equivalent to soybean oil, and the rapeseed oil density (g/cm3) is also equivalent to soybean oil. . Such rapeseed oil, soybean oil

Although it has not been shown, it has been confirmed that as with sesame oil, the width of the burning zone can be increased and the temperature holding time of the temperature zone can be extended. Even if the kerosene is confirmed, the width of the burning zone corresponding to the heavy oil is enlarged and the holding time of the high temperature region is prolonged. [Table 3] Fire point (°c^~~ Cai Xuan oil 313-320 - Soybean oil 282 sesame oil 255 Viscosity (Pa · S) Calorific value (kJ/g) ~~~4〇1 ~ __0.051 40.3 40.3 Density (g/cm3) 0.92 0.92 0.92 45.3 0.86 79 Kerosene 44 0.030 46.4 0.79 In the above embodiment, the liquid fuel is mixed by the mixing unit 25 by the spray mechanism 23 that sprays the liquid fuel mist 29. 098141326 22 201028482 The case where the gas is micronized and then sprayed toward the loading layer 9 in the horizontal direction will be described, but it is not limited thereto, and may be supplied from the compressed gas supply source 32 and the fuel supply pump 37. The compressed gas and the liquid fuel are mixed by a mixer to form a liquid fuel mist, which is supplied to the branch injection portion 27 of each spray mechanism 23 via a mist supply pipe. In this case, the liquid fuel mist is no longer required. The liquefaction is preferably maintained at a temperature above the boiling point of the liquid fuel and not above the ignition temperature. © Then, in the present invention, as described above, a cover 16 for covering the upper portion of the sintering machine tray 8 is provided. Body 16 can suppress cross wind The inventors of the present invention have conducted various reviews, and as a result, it has been found that the arrangement of the cover 16 has an effect of achieving a screen or more in terms of cross wind countermeasures. As described above, the cover 16 must have a configuration in which the upper center portion has the opening 17, or has an appropriate transmittance (void ratio), and the atmosphere can be taken in from the portion. Thus, inside the cover 16, The liquid fuel mist 29 sprayed by the spray mechanism U is mixed with the atmosphere. The opening Π is a sintering machine having a width of 5 m of the sinter machine pallet 8, and if it is about lm, the cover 16 is The pressure loss is almost negligible, and it is known that when a gap is provided in the opening 17, 'if the penetration rate is set to about 80%', the pressure loss to the extent of several mmAq can be suppressed. The provision of the rectifying plate 4 in the body 16 has the effect of suppressing the eddy current in the cover 16, and is most effective when the air gap of the upper portion (around) of the cover 16 is in the range of 30 to 40%. 098141326 23 201028482

Clothing reduced thumb shed 16c. From the result of the analysis, 4 " " the left and right side walls of the right and left sides of the punching metal 専 横 ^ ^ ^ ^ ^ ^ ^ ^

Air intrudes from the lower end of the cover 16. Further, 'between the cover 16 and the surface of the sintered bed (with the surface of the human body), 'between the lower end of the left and right side walls w in the direction in which the cover 16 is conveyed in the direction of the sintering plate 8 and the side wall 8a of the pallet, Further, between the lower surface of the branching injection portion 27 of the spray mechanism 23 and the upper surface of the accommodating layer 9, as shown in Fig. 7, a wire brush extending in the direction in which the sintering plate 8 is conveyed is provided, and an edge seal of the sealing sheet is inserted. The strip 41 is provided on its outer side with a cover covering the edge strip 41 from the outside. Further, the sealing material is not limited to the edge strip 41, and a sealing material such as a chain curtain, a seal brush, or a sealing seal may be used. Further, the above-mentioned sealing material is preferably heat-resistant, and the flexibility and deformation are free to produce a large amount, which does not cause damage to the surface of the loading layer 9. On the other hand, on the upstream side and the downstream side in the conveying direction of the sintering machine pallet 8, between the lower end of the front and rear plate portions of the cover 16 and the surface of the loading layer 9, as shown in Fig. 8, 'be along the front and rear walls of the casing 16. The air passage 43 is disposed, and air is blown from below the air passage 43 to form the air curtain 44. Further, the installation position, size, and arrangement number of the liquid fuel injection device 15 are set as follows. Namely, after the carbon material in the charging layer 9 is ignited, the liquid fuel mist 29 is supplied (imported) onto the charging layer 9. The reason is that the liquid fuel mist 29 does not have any influence on the combustion layer even if the liquid fuel mist 29 is supplied at the position immediately after the ignition, and only on the surface layer of the layer 9 is filled. Therefore, it is necessary to supply the molten material to the charging layer 9 after the sintered raw material charged in the upper portion of the layer 9 is fired to form a sintered finish tape which is a sintered cake layer. ❹ The principle of use of the liquid fuel mist of the present invention will be described using FIG. Fig. 11 (a) shows a photograph in which ethanol was formed to have a particle diameter of about 5 μm and used in a pot test. It is known that as the ethanol is blown in, the combustion melting zone will be greatly expanded. A schematic illustration of this phenomenon is shown in Fig. 11(b), in which the left side refers to the sintering reaction when a liquid fuel is blown. The powdered coke belonging to the condensed material is ignited by the ignition furnace, and the combustion zone formed of the powdered coke is lowered while the charging layer of the sintering raw material is lowered. The sintered crucible formed by the sintering belt completes a gas burning belt which generates a liquid fuel gas when a liquid fuel gas is blown between the sintering completion belt and the powder coke combustion belt, and the temperature is not raised at the most In case of high temperature domain retention time is prolonged. The sintering reaction at the time of use of the liquid fuel mist of the present invention is shown on the right side. In the present invention, as described above, the particle size of the liquid fuel mist is not more than ΙΟΟμηι or less, preferably 5 〇μηη or less. If the particle size exceeds ΙΟΟμηι, the heat of the belt is completed by sintering, resulting in the remaining droplets and the possibility of burning in the surface layer. If the liquid fuel mist particle size is set below iqing m 098141326 25 201028482, the liquid fuel mist (liquid fuel particles) will also contain its agglomerated particles, which will be vaporized to form a vapor of liquid fuel, when the liquid fuel forms a liquid fuel mist. When it is blown between the sintered finish zone and the powdered coke combustion zone, a gas burning zone of liquid fuel gas will be generated, and here, the maximum temperature rise will not be extended to extend the high temperature range retention time. The same phenomenon as when using gaseous fuel. When the liquid fuel is blown, as shown in Fig. 11 (b), the gasification (liquid fuel vapor) region of the liquid fuel particles is important. That is, in the liquid fuel vaporization region of Fig. 11(b), first, it is preferable to spray the liquid fuel from the nozzle so that the vapor concentration of the liquid fuel becomes equal to or lower than the lower limit of combustion in Table 1. In order to prevent the surface layer portion of the sintered belt from being burned during the blowing, it is necessary to set it to 75% or less of the lower limit of the combustion concentration, and the lower limit is to use the fuel heat, and at least 1% of the lower limit of the combustion concentration. It is preferably 25% or less and 4% or more of the lower limit of the combustion concentration. The upper limit is determined from the safety test 4 such as fire. The lower limit is determined by the effective heat. In addition, it must be below the ignition temperature. The point of combustion as shown in Figure u(c) is the highest temperature in the powder coke side A control sintering reaction, while the high temperature domain holding time is below the maximum temperature to maintain the burning of the combustion zone temperature. Figure 1 (α) shows this example. The temperature secret represented by C will be difficult. The money junction (4), the in-layer temperature experience during sintering production in the sintering reaction. The maximum temperature control is performed using the ~j/ti material anomaly, and the high temperature range holding time E is determined by the temperature pattern. When 098141326 26 201028482 is extended according to the temperature profile of the c-temperature mode, the amount of powder coke added will be increased, and the flat bottom region of the curve above 12°°C in the high temperature region will be expanded, but the maximum temperature must also be increased. . The temperature profile when liquid fuel is used is expressed by D. As shown in Fig. 11 (c), the combustion of the liquid fuel is based on the combustion of the liquid fuel side B in Fig. 11 (c) which maintains the temperature of the combustion zone below the maximum temperature. By the combination of the two, the temperature φ type D of Fig. 11(d) which raises the temperature of the flat region at the bottom of the curve can be obtained without causing the maximum temperature change. With this temperature profile D, 12 turns are expanded. (: The flat area at the bottom of the curve in the above area ensures that the high temperature range is maintained for time F. Figure 12 shows the pot test photo of the conventional sintering method and the liquid fuel mist using the sintering method [when the sintering is performed] because of the heat of combustion using the powdered coke Therefore, the powder coke is relatively high, and even if it is high, it appears to be a white burning/melting zone, which is about 65 mm in this experiment. In the gasification zone (sintering completion zone) of the liquid fuel, the temperature system of the zone is set. It is above the boiling point of the liquid fuel and below the ignition temperature (can be controlled by making the concentration lower than the lower limit of the combustion limit), and the liquid fuel is heavy oil or ethanol. In order to suppress the maximum temperature to 1380 ° C, the powder coke is reduced. The amount of use can be as follows: either one can look like a white burning • the sinter strength obtained by expanding the melting zone can be higher than the conventional sintering method using only powdered coke. In the liquid fuel vaporization zone (sintering completion zone), the temperature of this zone must be equal to or higher than the boiling point of the liquid fuel and below the ignition temperature. Thereby, the phenomenon shown in Fig. 12 can be obtained. 098141326 27 201028482 In addition, if the temperature of the gasification _ (sintered wire) is above the ignition temperature (high concentration near the lower limit of the combustion limit), as shown in Fig. 13, the surface of the sintered band before entering the powdered coke combustion zone is The liquid fuel vapor will burn, causing the effect to disappear, which will adversely affect the sintering operation caused by insufficient oxygen. In addition, the supply of the liquid fuel mist can be formed by forming a layer of sintered cake on the surface of the loading layer 9. The calculation is carried out at any position where the money knot is completed. The reason why the supply of the liquid fuel mist is carried out after forming the layer of the sintered cake is as follows. (a) The sintered cake is not formed on the upper portion of the loading layer 9 In the state after the ignition, the supply of the liquid fuel mist may cause the possibility of combustion on the loading layer 9. (8) The supply of the liquid fuel mist is performed on the part that must increase the yield of the sintered ore. It is more desirable to supply the portion where the strength of the sinter is increased by looking for a burn. In order to adjust either or both of the highest cylinder temperature or the high temperature holding time of the loading layer, Preferably, the liquid fuel mist is supplied in a state where the thickness of the combustion/melting zone is at least 15 mm or more (preferably 2 mm or more, more preferably 3 mm or more). (4) If the burning and correction (4) thickness is less than 15 mm The cooling effect by the air sucked by the sintered layer (sintered cake) and the liquid fuel mist 'causes that even if the (four) fuel mist is burned, the effect is still insufficient. The burning cannot be expected and the thickness of the molten belt is enlarged. 098141326 28 201028482 When the thickness of the above-mentioned combustion/melting zone is 15 mm or more (preferably 2 mm or more, more preferably 30 mm or more), the supply of the liquid fuel mist is increased, and the thickness of the burning and melting zone is greatly expanded. It can prolong the holding time in the high temperature range and obtain the sinter with high cold rolling strength. Further, the introduction of the liquid fuel mist into the charging layer 9 is preferably performed below the surface layer after the combustion front, and the burning/melting belt is lowered to a position of more than 1 mm from the surface layer, preferably 200 mm or more, that is, The sintered cake region (sintered layer) formed in the middle layer and the lower layer of the layer 9 is burned and passed, and is supplied in a state in which the combustion front line moves to a temperature of more than 10 mm from the surface layer. The reason is that if the combustion front line is lowered to a position 100 mm or more from the surface layer, the adverse effect of cooling caused by the suction of air through the sintered layer can be alleviated, and the thickness of the melting zone can be increased. When it is lowered to a position of 2 GGmm or more from the surface layer, the cooling effect due to air can be slightly removed, and the thickness of the combustion/melting zone can be increased to 3Qmm or more. © In addition, the supply of the liquid fuel mist is preferably carried out near the side walls of the both ends of the width of the pallet where the yield is lowered. In addition, the liquid-fired (four)-emitting device 15 differs depending on the scale of the sintering machine. For example, a sintering machine having a production capacity of about 15,000 t/inch and a machine length of 9 〇m is preferably disposed about 5 〇1 on the downstream side of the ignition furnace 10. Later position. In the sintering machine of the present invention, the 'supply position of the liquid fuel mist (introduction position to the loading layer)' is preferably from the exit side of the ignition direction of the pallet, and the so-called combustion front line after the generation of the sintered cake is carried out to the surface layer. The position (for example, a position of 100 mm or more from the surface layer 098141326 29 201028482, preferably about 2 mm or less, which causes the liquid fuel mist to be burned) is performed at any position between one or more positions until the completion of sintering. This phenomenon is as described above, meaning that the introduction of the liquid fuel mist is started at the stage where the combustion front line moves under the surface of the loading layer, and as a result, the combustion of the liquid fuel mist will occur inside the loading layer, and then quickly move to the more. The lower layer, therefore means that there is no threat of explosion and a safe sintering operation. The method of producing a sintered ore according to the present invention also means that the liquid fuel mist contained in the layer is introduced to promote reheating of the resulting sintered cake. That is, the supply of the liquid fuel mist is originally maintained in a high temperature region for a short period of time, which is liable to cause heat deficiency, resulting in a lower cold rolling strength of the sintered ore, and a higher reactivity of the liquid fuel than the solid fuel. The fog will make up for the burning heat of this part which is easy to cause deficiency. It has the meaning of being responsible for the combustion and the regeneration of the melting zone. Furthermore, the method for producing a sintered ore according to the present invention is preferably supplied from a liquid fuel mist in an upper portion of the charged layer after ignition to a portion of the liquid fuel mist in the layer to be maintained in an unburned state. It reaches the combustion and melting zone, and the enthalpy is burned at the target position where the heat of combustion is to be compensated. The reason is that the supply of the liquid fuel mist, that is, the introduction effect into the charging layer is not only applied to the upper portion of the layer, but also to the combustion/melting zone in the center portion in the thickness direction on the right side, and the judgment is more effective. That is, the supply of liquid fuel mist, if implemented in the upper layer of the manned layer that is prone to heat shortage (insufficient holding time in the high temperature range), will provide sufficient combustion heat to improve the sintered cake of this part. The supply of 098141326 201028482 of the liquid fuel mist is also applied to the zone below the middle layer, and it is re-combusted with the liquid fuel mist on the combustion/melting zone originally composed of carbon material. The melting zone has the same result because It is associated with the expansion of the upper and lower directions of the combustion and melting zone, so that the effect of extending the holding time in the high temperature range can be achieved without increasing the maximum temperature of arrival, so that sufficient movement can be achieved without lowering the moving speed of the pallet. sintering. As a result, the quality of the sintered cake which is integrated into the entire layer is improved (the cold rolling strength is improved), and even the quality of the finished sintered ore (cold rolling strength) and productivity can be obtained. Further, in the present invention, when the liquid fuel mist is introduced (supplied) into the layer, it is preferable to adjust not only the supply position but also the form of the combustion/melting belt itself, and also to the combustion and melting. The maximum arrival temperature of the belt and/or the holding time of the > Generally, in the loaded layer after ignition, as the movement of the pallet moves rapidly toward the lower side and the front side (downstream side) of the combustion (flame) front, the position of the combustion/melting belt 10 is also as shown in the aforementioned FIG. 18 (a). ) Change as shown. However, as shown in Fig. 18, the thermal history experienced in the sintering process in the sintered layer is different from the upper layer to the lower layer in the upper layer to the lower layer in the high temperature region (becoming about 1200 〇C or more). Time) has a big difference. As a result, the sinter yield in the pallet is distributed as shown in Fig. 18(c). That is, the formation of the surface layer portion (upper layer portion) has a low yield. The middle layer and the lower layer portion have a high yield distribution. According to the method of the present invention, the supply of the liquid fuel mist is carried out, and the thickness of the combustion and the smelting zone in the vertical direction and the width of the pallet are expanded. 098141326 31 201028482 This phenomenon will be reflected in the finished sintered ore. Quality improvement. Then, it becomes the middle layer and the lower layer of the high-rate distribution, and it is possible to control the high-temperature range holding time, thereby further improving the yield. By adjusting the supply (introduction) position of the liquid fuel mist, it is possible to control the form of the combustion/melting zone (ie, the height of the combustion/melting zone in the height direction and/or the width of the pallet), and The maximum arrival temperature and the temperature range hold time can be controlled. These control systems can further highlight the effects of the present invention, and can be sufficiently burned by controlling the thickness of the combustion/melting zone in the vertical direction and the direction width of the pallet, or the control of the maximum temperature and the holding time in the high temperature range. Cheng, has an effective contribution to the improvement of cold rolling strength of finished sinter. Further, in the present invention, the supply (introduction) of the liquid fuel mist to the packed bed may be controlled by controlling the cold rolling strength of the entire finished sintered ore. That is, the initial purpose of supplying liquid fuel mist is to improve the cold rolling strength of the sintered cake (or even the sintered ore), in particular, by controlling the supply position of the liquid fuel mist, and sintering the raw material in the thief/melting zone. (4) Time control and maximum temperature control, the cold rolling strength (fragment index) of the sintered ore is set at about 75 to 85%, preferably 80% or more, and more preferably at most 9%. The strength level is in the present invention, in particular, by the concentration, the supply amount, the supply position and the supply of the liquid fuel mist, and the amount of carbon in the raw material of the smelting raw material (the input heat is set to a certain condition) And adjustments can be made cheaply. In addition, the cold rolling strength of the sinter is increased. On the other hand, 098141326 32 201028482 will cause the repairing power to increase and continue to be low (4). The problem is solved by _temperature and high temperature range-= line = system. The sinter mine cold rolling is also improved. The strength of the sintered ore is 2 degrees. The value of the new one is increased by 1〇~15%. ^In the fog of the steel test station, in the direction of the pallet, the introduction position of the liquid fuel mist into the loading layer will be from the loading layer to the wet zone, and the sintered ore will be cooled (10). In order to perform this control, in the present invention, by the scale (size), the number, the position of the injection device, the ", the 枓 spray (the distance from the ignition furnace), the gas 浓度 concentration, the sintering is performed. The carbon (4) (__) of the original money is adjusted, not only the size of the burning and melting zone (the thickness of the upper and lower direction and the square of the consumption plate = width), but also the temperature at which the high temperature reaches the temperature and the holding time in the high temperature range is controlled. The strength of the sintered cake produced in the loading layer can be controlled. The operation of the above embodiment will be described. First, as shown in Fig. 1, the sieved ore block is cut out from the bottoming hopper 4, and the bottom layer is formed on the 8 (four) sieve of the sintering machine tray, and then 5 submerged barrels are loaded on the bottom layer. The barrel feeder 6 applies a sinter amount of the sintered raw material to form a layer of the so-called "sintered bed". The layer 9 is attached to the left side, and then moved to the ignition furnace with the transfer of the sintering machine tray 8. The carbon material in the surface layer of the lower layer 9 is ignited. 098141326 33 201028482 After the ignition, the intrusion layer 9 is rapidly expanded downward and forward (downstream side) in the front of the combustion (flame) with the movement of the sintering machine plate 8, and the position of the combustion/melting zone will be as shown in Fig. 18 above. (a) The changes shown. Then, when the position of the combustion/melting zone is moved from the upper layer to the middle layer and reaches about 2 mm from the surface layer, the sintering machine pallet 8 reaches the position of the liquid fuel injection device 15. The liquid fuel nozzle device is used to uniformly spray the liquid fuel mist toward the surface of the loading layer 9 by the nozzle mist mechanism 23 in the cover 16 above the S-cover sintering machine tray 8. That is, in the liquid fuel injection device 15, at a predetermined distance from the surface of the loading layer 9 of the liquid sintering machine pallet 8, the conveying direction of the sintering plate 8 is parallelly extended 'and orthogonal to the conveying direction A combination of a predetermined array of compressed gas supply piping 21 and a liquid fuel supply piping 22 is disposed in the width direction, and a spray mechanism 23 is disposed in each of the compressed gas supply piping 2 and the liquid fuel supply piping 2 2 The 23 system mixes the condensed gas with the liquid fuel, and atomizes it into a liquid fuel having a particle diameter of 1 μm or less, a particle diameter of 5 μm or less, and a particle diameter of 20 μm or more, after forming a liquid fuel mist. Spray in a slightly horizontal direction. Then, as shown in FIG. 5, the spray mechanism 23 is disposed at a half-pitch arrangement in the direction in which the adjacent spray mechanisms 23 are not opposed to each other in the direction in which the adjacent spray nozzles 8 are conveyed, and thus from the adjacent group. The liquid fuel mist 29 emitted from the nozzles of the spray nozzle portions 28a and 28b of the spray mechanism forms a uniform spray region which does not interfere with each other. 098141326 34 201028482 The injected liquid fuel mist 29 is mixed with the air rectified by the rectifying plate 40, and is diluted to a lower limit of the combustion lower limit concentration at normal temperature to suppress the combustion above the charging layer 9. In this case, at least one of nitrogen, carbon dioxide, and water vapor having a flame-retardant property is used as a component for atomizing the liquid fuel, and the liquid fuel mist 29 contains such a consumer. • The flame compresses the gas, so that it is possible to surely suppress the combustion of the liquid fuel mist 29 on the upper side of the charging layer 9. Then, the liquid fuel mist 29' ejected from the injection nozzle portions 28a and 28b of the respective spray mechanisms 23 is sucked to the lower side via the bellows 11' disposed on the lower side of the sintering machine tray 8, thereby It is mixed with the air that has been rectified by the rectifying plate 4 and introduced into the loading layer 9. The liquid fuel mist 29 introduced into the charging layer 9 passes through the sintered cake ' formed in the surface layer portion and reaches the combustion/melting zone which is above the surface l〇〇nmi and burns in the combustion/melting layer. . Therefore, the original high temperature domain protection period is short, H causes heat deficiency, and the upper and middle domains with low intensity of pure cold rolling can be maintained at a temperature in the high temperature range maintained above 1200 ° C. The holding time is extended. It can improve the cold rolling strength of the sintered ore. Therefore, the yield of the upper and middle portions having a lower yield as shown in Fig. 18(c) can be improved when the liquid fuel mist 29 is not blown. According to this, if the supply action of the liquid fuel mist 29 affects the area below the middle portion, the formation of the re-combustion/melting zone by the liquid 4 fuel mist 29 is formed on the combustion/melting zone originally composed of the carbon material. The same result, 098141326 35 201028482 Because the width of the burning and melting zone in the vertical direction is increased, the effect of prolonging the holding time in the high temperature range can be achieved without increasing the maximum reaching temperature, so the sintering machine can be prevented from being lowered. In the case where the pallet 8 moves at a speed, sufficient sintering is achieved. As a result, the quality of the sintered cake which is up to the entire loading layer 9 can be improved (cold rolling strength improvement), and the quality (cold rolling strength) and productivity of the sintered ore can be improved. In addition, when the fuel supply pipe 21 starts to supply the liquid fuel and the liquid fuel supply is stopped, the heated gas is supplied as a forced gas to the liquid fuel supply pipe 21 to burn the liquid fuel remaining in the pipe. Remove. Accordingly, in the above embodiment, after the surface layer of the charging layer 9 is ignited by the ignition furnace 1 , the liquid fuel injection device 15 is conveniently placed on the upper side of the charging layer 9 of the sintering machine tray 8 to make the liquid fuel mist 29 uniform. Disperse and spray, in contrast to the use of a gaseous fuel such as a drum gas, LNG, mixed gas, or a dilute gas fuel diluted with air, because a liquid fuel having a higher fire temperature is used. Rather than directly using the liquid fuel, the liquid gas is atomized by the compressed gas, and after the liquid fuel mist is formed, the injection is performed, so that the possibility of ignition on the upper side of the charging layer 9 can be surely suppressed. Further, by using a gas containing at least one of nitrogen, carbon dioxide, and water vapor having a flame-retardant property as a main component of the compressed gas, it is possible to further suppress the possibility of ignition on the upper side of the charging layer 9. Further, in the above-described embodiment, the case where the liquid 098141326 36 201028482 state fuel injection device 15 is disposed on the downstream side of the ignition furnace 1 is described. However, the present invention is not limited thereto, and the case of the wire temperature furnace on the downstream side of the ignition furnace 1G is not limited thereto. It suffices that the liquid fuel injection device 15 is disposed on the downstream side of the holding furnace. Further, in the above-described embodiment, the cover body I6 of the liquid material ejection device is configured to have a structure in which the opening σ 1 is provided, but the structure is not limited thereto, and the structure may be as shown in FIG. The cover 16 is formed in an open configuration at the upper end and is disposed between the cover 17 and the front and rear walls 19 in the vertical direction.

3 rows of barrier plate columns 52' The barrier plate array 52 has a barrier plate 5 having a shape of a long shape along the direction in which the sintering plate 8 is conveyed and having a vertex as a top portion, and the barrier plate 51 is formed. In a width direction orthogonal to the conveying direction of the sintering machine pallet 8, a structure in which a predetermined pitch ρ is maintained in a predetermined number of parallels is maintained. Between the barrier plate rows 52 adjacent to each other in the up-and-down direction, the barrier plate 51 disposed as the other barrier plate row 52 is located between the towel-transfer row of the barrier plates 51 and at the lowermost barrier (four) 52 A spray mechanism 23 is disposed between the lower transfer plates 51. In the above-described embodiment, the case where the liquid fuel is supplied from the liquid fuel storage tank 38 to the liquid fuel supply source piping 36 and the liquid fuel supply piping 22 at normal temperature is not limited thereto, and is related to, for example, c heavy oil. A liquid material having a high degree of _ and a fine particle size at a normal temperature is preheated to, for example, 130 by using, for example, steam. (:~i5〇°c, after the viscosity is lowered, it is supplied to the liquid fuel supply pipe 22, and can be easily atomized by the spray mechanism 23, and the spray can be performed after the liquid fuel mist 29 is formed. 098141326 37 201028482 (Industrial Applicability) The technology of the present invention can be effectively used as a manufacturing technique of a sintered ore for use in iron making, particularly for a raw material for a blast furnace, and can also be utilized as a technique for forming other ore blocks. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic structural view of an embodiment of a sintering machine according to the present invention. Fig. 2 is a schematic cross-sectional view taken along line AA of Fig. 1. Fig. 3 is a front view of a spray mechanism. Fig. 4 is a spray mechanism of a liquid fuel injection device. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 5 is an explanatory view of a liquid fuel mist injection state of a liquid fuel injection device. Fig. 6 is a system diagram of a liquid fuel and compressed gas supply system in a liquid fuel injection device. The specific configuration of the apparatus is taken along the line AA in Fig. 1. Fig. 8 is an explanatory view of the front-back direction sealing mechanism of the liquid fuel injection device. Fig. 10 is a diagram showing the change of combustion and melting zone in a test pot which is blown into a test pot by a liquid fuel. Fig. 11 is a diagram showing the change of the combustion/melting zone in a test pot which is blown by a liquid fuel. Schematic diagram of the time, (a) is the pot test 098141326 38 201028482 (c) the condition map of the burning test, (b) the schematic diagram of the pot test phenomenon point diagram '(d) the temperature map inside the layer. Figure 12 Fig. 13 is a view showing a state of a fire when the liquid fuel is blown in. Fig. 13 is a cross-sectional view taken along line AA of Fig. 1 according to another embodiment of the present invention. An explanatory view of the sintering process is shown in Fig. 16. Fig. 16 is an explanatory view of pressure loss and temperature distribution in the sintered layer.

Fig. 17 is an explanatory diagram for comparison of temperature distribution at the time of rain production and low production. Fig. 18 is a graph showing temperature distribution and yield distribution in a sintering machine, (a) a sintered, a bismuth process (b) temperature distribution, and (4) a yield distribution. [Main component symbol description] Raw material hopper 2 Rotary mixer 3 Rotary kiln 4 Feeding bucket bottoming bucket feeder 7 Cutting chute winding machine pallet 9 Intrusion layer 10 11 Ignition: Bellows 098141326 39 201028482 15 Liquid fuel injection device 16 Cover 16b Front and rear plate portion 16c Cross wind attenuation fence 17 Opening 18 Side wall 21 Compressed air supply pipe 22 Liquid fuel supply pipe 23 Spray mechanism 24 Vertical pipe 25 Mixing portion 26 Connecting pipe 27 Branching injection portion 28a 28b injection nozzle portion 29 liquid fuel mist 31 compressed gas supply source pipe 32 compressed gas supply source 33 gas storage tank 34 compressor 35 receiving groove 36 liquid fuel supply source pipe 37 fuel supply pump 098141326 40 201028482 38 liquid fuel storage tank 40 rectification Plate 41 Edge banding 42 Cover body 43 Air passage 44 Air curtain 51 Barrier plate Ο 52 Barrier plate column FC flow meter LB Bypass flow path LM Main line VC control valve 098 098141326 41

Claims (1)

201028482 VII. Patent application scope: 1. A method for manufacturing sinter ore, comprising: loading step, loading a sputum material containing powder ore and carbon material on a circulating moving pallet to form an intrusion layer; The ignition step of igniting the carbon material in which the charged layer is formed by the ignition furnace, and the liquid fuel supply step, after the ignition, supplies the liquid fuel atomized to the particle size to the intrusion layer. And the diameter sintering step 'making a sintered ore by using a bellows disposed below the pallet. 2. The method for producing a sintered ore according to the invention of claim 2, wherein the microparticulated liquid fuel has a particle diameter of not more than ΓΑ20 μηι or less. 3. The method for producing a sintered ore according to claim 1, wherein the liquid fuel supply step is micronized to a particle size called 茁, the upper fuel is supplied to the packed bed and diluted to room temperature. It is supplied to the packed bed under the following conditions of combustion. 4. The method of manufacturing a sintered ore according to item 1 of the patent application, wherein '. The above-mentioned micronized liquid fuel has a lower limit of combustion concentration of 卞#. 5. The method for producing a sintered ore according to item 4 of the patent application scope, 75% or less and 1% of the lower limit concentration of the lower limit of combustion. . The above is a manufacturing sinter of the sinter ore according to item 5 of the patent application scope, and the concentration lower limit concentration of the combustion system is 25% or less and 4% or more. The method of manufacturing the sintering method according to the first aspect of the invention, wherein the liquid fuel supply step is to pour the r-state fuel which is micronized to a particle size of l_m or less in the horizontal direction. 8. The method for producing a sintered ore according to claim 1, wherein the liquid fuel supply step (4) is granulated in _(iv) and sprayed onto the packed bed. 9. The method of manufacturing a sintered ore according to item 8 of the patent application, which is a gas containing nitrogen, carbon dioxide, and water as a main component of the compressed gas fairy. 1. The method for producing a sintered ore according to claim 1, wherein the liquid fuel is selected from the group consisting of petroleum-based liquid fuel, alcohol-based liquid fuel fuel, and other hydrocarbon-based compound liquid fuel. Less one. Released to u. Manufacture method of sinter ore as claimed in Article 1G of the patent application The above-mentioned petroleum-based liquid fuel is derived from kerosene, light oil and heavy oil! Choose at least one. Selection 12. The method for producing a sintered ore according to the scope of claim 1G is to use at least one of methanol, ethanol and diethanol. ^Fresh and medium 13. As in the manufacturing method of the sinter of claim 10, the above other hydrocarbon-based liquid fuels are from decane, hexane, heptane, alkane, decane, decane Select from the group consisting of, stupid and acetone to + _ Xin Xi 1 . The method for producing a sintered ore according to the above aspect of the invention, wherein the liquid fuel supply step is performed after the sintering cake is formed in the surface layer portion of the layer, until the sintering element is stopped. Supply of micronized liquid fuel. 15. The method of producing a sintered ore according to claim 1, wherein the liquid fuel supply step is supplied to the micronized liquid fuel in a region where the thickness of the combustion/melting zone is 15 mm or more. 16. The method of producing a sintered ore according to claim 1, wherein the liquid fuel supply step is to supply the micronized liquid fuel after the combustion front reaches the l〇〇mm Q position below the surface layer. 17. A sintering machine comprising: a pallet that is recyclable; a raw material supply device 'loading a sintered raw material containing powdered ore and carbonaceous material on the pallet to form a charging layer; The carbon material in the sintering raw material on the pallet is ignited; the liquid fuel injection device is disposed on the downstream side of the ignition furnace, and atomizes the liquid cerium fuel to a particle diameter of 1 〇〇 μηη or less, and is loaded into the layer The upper spray; and the bellows, air suction below the pallet. 18. The sintering machine of claim 17, wherein the liquid fuel injection device is provided with: a compressed gas supply source, a liquid fuel supply source, and a spray mechanism; and the spray mechanism is derived from the compressed gas The compressed gas supplied from the source and the liquid fuel from the liquid fuel supply source are mixed, and atomized, and then sprayed in the horizontal direction toward the loading layer. The sintering machine according to claim 18, wherein the spraying mechanism is provided with: the conveying pipe is inclined downward toward a downstream side of the mixed fluid for conveying the compressed gas and the liquid fuel; The injection nozzle is connected to the lower side of the transfer pipe, and the discharge nozzle is inclined downward toward the discharge port in which the liquid fuel formed under the communication pipe is sprayed in the horizontal direction. 20. The sintering machine according to claim 17, wherein the liquid fuel is a petroleum-based liquid fuel, an alcohol liquid fuel, an ether liquid fuel, or another hydrocarbon-based compound liquid fuel which is in a liquid state at a normal temperature. Select at least one of the constituent groups. 21. The sintering machine of claim 18, wherein the compressed gas system is a gas having at least a sulphur content of nitrogen, carbon dioxide, and water vapor. 22. The sintering machine of claim π, wherein the liquid fuel injection device has a preheating mechanism, wherein the preheating mechanism is optimal for microparticulation when the viscosity of the liquid fuel is high. The liquid fuel is preheated in a manner of viscosity. 098141326 45