JP5776654B2 - Method for reforming object to be reformed, method for producing coke and sintered ore, and method for operating blast furnace - Google Patents

Description

  The present invention relates to a technology for reforming a raw material used as a raw material for coke production, a solid fuel for producing sinter ore, and a reducing material for blowing blast furnace tuyere in an iron making process.

  Conventionally, high-quality caking coal such as bituminous coal has been mainly used as a raw material for coke, but caking coal is expensive and its output is limited. Therefore, it can be used as a raw material for coke by modifying low-grade coal, such as non-slightly caking coal, which has lower caking properties than caking coal, and blending it into caking coal. Has been done.

  For example, in Patent Document 1, a low-grade coal and a solvent are mixed to extract a soluble component in the solvent of the low-grade coal, an extraction residue is mixed with the extracted extract, and the solvent is removed from the mixture. A production method for producing a homogeneous modified low-grade coal in which localization of properties such as softening and melting properties is suppressed by removing is disclosed.

  Generally, in the iron ore sintering process, powdered coke as a solid fuel is mixed with iron ore and the mixture is sintered to produce a sintered ore. In the operation of the blast furnace, the operability of the blast furnace is improved by blowing pulverized coal as a reducing material together with hot air from the tuyere of the blast furnace. The reformed coal obtained by the conventional low-grade coal reforming method is mainly used as a raw material for coke production, and its use as a solid fuel for sinter production and a reducing material for blast furnace tuyere injection has been studied. Not.

JP 2007-161955 A

  In order to increase the blending ratio of low-grade coal such as non-slightly caking coal in the blended coal that is the raw material for coke and further reduce the blending ratio of high-grade coal such as caking coal It is necessary to produce modified coal with a high effect of improving coke strength.

  Moreover, in order to further improve the production rate of sintered ore, it is necessary to use a combustion material solid fuel having a higher combustion performance than the conventional coke, which is powdered coke. Moreover, in order to further improve the operability and production rate of the blast furnace, it is necessary to use a reducing material having higher combustion performance than conventional pulverized coal.

  Therefore, a first object of the present invention is to obtain a modified product having an excellent effect of improving coke strength. The second object of the present invention is to obtain a reformed product having excellent combustion performance.

The present invention has been made to solve the above problems, and the gist of the invention is as follows.
(1) A reforming object composed of lignite, subbituminous coal, steam coal or biomass and a solvent composed of oil containing 10% by mass or more of tar acid distilled in tar distillation are mixed, and the reforming object and the solvent The mixture is pressurized and heated to produce an insoluble component of the modification target and a first liquid phase component in which the soluble component of the modification target is dissolved in the solvent. A method for modifying an object to be reformed, comprising separating a dissolved component and the first liquid phase component. According to the configuration of (1), the first object can be achieved.

(2) In the configuration of (1), the first liquid phase component is further cooled to produce a first solid phase component and a second liquid phase component dissolved in the solvent. 2. The method for reforming an object to be reformed according to claim 1, wherein the second solid phase component is generated by separating and further separating the solvent from the second liquid phase component. According to the configuration of (2), the first and second objects can be achieved.

(3) In the configuration of (1) above, a method for reforming an object to be reformed, wherein the first liquid phase component is cooled to a temperature of 20 to 50 ° C. According to the configuration of (3), the extraction rate of the first solid phase component and the second solid phase component can be increased.

(4) One or two of the first solid phase component and the second solid phase component obtained by the method for reforming an object to be reformed as described in (2) above are used for producing blast furnace coke. A method for producing coke, which is used as a raw material. According to the configuration of (4), the coke strength can be increased at low cost.

(5) A mixture obtained by mixing the second solid phase component and the insoluble component obtained by the method for reforming an object to be reformed as described in (2) above is used as a raw material for producing blast furnace coke. Coke production method. According to the configuration of (5), the coke strength can be increased at low cost.

  (6) A mixture obtained by mixing the insoluble component obtained by the method for modifying an object to be modified described in (2) above with the first solid phase component, or a carbide obtained by carbonizing the mixture is sintered ore. A method for producing sintered ore, characterized by being used as a solid fuel for production. According to the structure of (6), the production efficiency of a sintered ore can be improved at low cost.

  (7) The first solid phase component obtained by the method for reforming an object to be modified as described in (2) above or a carbide obtained by carbonizing the first solid phase component is used as a solid for producing sintered ore. A method for producing a sintered ore characterized by being used as a fuel. According to the structure of (7), the production efficiency of a sintered ore can be improved at low cost.

(8) A mixture obtained by mixing the insoluble component obtained by the method for modifying an object to be modified described in (2) above with the first solid phase component, or a carbide obtained by carbonizing the mixture is used as a blast furnace blade. A method for operating a blast furnace characterized by being used as a reducing material for blowing in a mouth. According to the structure of (8), the operativity of a blast furnace can be improved at low cost.

  (9) Reduction of blast furnace tuyere injecting the first solid phase component or the carbide obtained by carbonizing the first solid phase component obtained by the method for reforming an object to be reformed according to (2) above A method of operating a blast furnace characterized by being used as a material. According to the structure of (9), the operativity of a blast furnace can be improved at low cost.

  According to the present invention, a modified product having a high effect of improving coke strength can be obtained.

It is the figure which showed the modification | reformation process of the modification target object. It is the figure which showed the utilization method of the modified material extracted at the modification | reformation process. It is process drawing which shows the modification | reformation process of the biomass of a modification | reformation target object.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
With reference to FIG. 1, the reforming method of the low-grade coal which is the modification target according to the present embodiment will be described. FIG. 1 is a process diagram showing a reforming process of low-grade coal. In the mixing step 13, the low-grade coal supplied from the coal tank 11 and the solvent supplied from the solvent tank 12 are mixed. In the pressure heating step 14, the mixture of the low-grade coal obtained in the mixing step 13 and the solvent is heated under pressure to dissolve the soluble component of the low-grade coal in the solvent. The solvent in which the soluble component of the low-grade coal is dissolved is referred to as the first liquid phase component X, and the insoluble component of the low-grade coal that is insoluble in the solvent is referred to as the insoluble coal R. In the first separation step 15, the first liquid phase component X and the insoluble coal R are subjected to solid-liquid separation.

  In the cooling step 16, the first liquid phase component X is cooled, and the extracted coal D (first solid phase component) which is a part of the soluble component of the low-grade coal, and the remaining second liquid phase component. Get Y. In the second separation step 17, the second liquid phase component Y and the extracted coal D obtained in the cooling step 16 are subjected to solid-liquid separation. In the third separation step 18, the solvent is removed from the second liquid phase component Y separated in the second separation step 17, and the remaining extracted coal S (second solid phase component) is obtained. That is, three different types of useful coal, that is, insoluble coal R, extracted coal D, and extracted coal S can be obtained from a mixture of low-grade coal and solvent.

(About coal tank 11)
The coal tank 11 stores low-grade coal made of lignite, subbituminous coal, or steam coal. By obtaining such low-grade coal as a raw material for iron making processes, raw materials for coke production, solid fuel for production of sintered ore, and reformed coal useful as a reducing material for blast furnace tuyere injection, raw material costs Can be reduced.

(About solvent tank 12)
The solvent tank 12 stores a solvent for dissolving the soluble components of the low-grade coal stored in the coal tank 11. As the solvent, oil containing 10% by mass or more of tar acid distilled in tar distillation can be used. And as oil distilled in tar distillation, carboru oil is preferable. Carbol oil is an oil that is distilled at 170-200 ° C in tar distillation, and contains 34-45% tar acid. It is also referred to as carboxylic acid oil (from the coal utilization technical terminology dictionary ((Japan) Fuel Association) Ed., 1983). Solvents other than carborub oil include naphthalene oil and creosote oil.

  Furthermore, by using carboru oil as a solvent, among the insoluble coal R, the extracted coal D, and the extracted coal S that are separated, more extracted coal S that has a higher effect of improving coke strength can be recovered. This is due to the action of a functional group (phenolic hydroxyl group) indicating the polarity of tar acid contained in carboru oil, which breaks the hydrogen bonds in the coal polymer structure and relaxes the coal agglomeration structure, and the extracted coal S is extracted. It is thought that it became easy to be done.

  The solvent preferably has a boiling point of 170 to 330 ° C. When the boiling point is less than 170 ° C., the required pressure in the pressure heating step 14 increases, and the loss due to volatilization increases in the step of recovering the solvent, and the solvent recovery rate decreases. Furthermore, the extraction rate of the solid phase component is reduced. On the other hand, if it exceeds 330 ° C., it will be difficult to separate the solvent described later, and the solvent recovery rate will decrease.

  Thus, the extraction rate of useful modified coal can be increased by heat-extracting low-grade coal using a solvent. Furthermore, since heat-extracting low-grade coal using a solvent eliminates the need to use expensive hydrogen or a catalyst, the low-grade coal is solubilized at low cost to improve economy. be able to.

(About mixing step 13)
In the mixing step 13, the solvent supplied from the solvent tank 12 and the low-grade coal supplied from the coal tank 11 are mixed. The mixture of the low-grade coal and the solvent exists in a slurry state in which the particles of the low-grade coal are dispersed in the solvent. Hereinafter, this mixture is referred to as a slurry.

(About pressure heating process 14)
In the pressure heating process 14, the slurry of low-grade coal and solvent is heated to a predetermined extraction temperature. This heat treatment is performed in a pressurized state so that the solvent in the slurry does not reach the boiling point. Specifically, by setting the gauge pressure value to 0.8 to 2.5 MPa, it is possible to prevent boiling of the solvent and increase the extraction rate of useful reformed coal. When the temperature of the slurry (more specifically, the liquid temperature of the slurry) reaches a temperature at which the soluble components of the low-grade coal are sufficiently extracted under this pressure condition (hereinafter referred to as the extraction temperature), the low-grade The soluble component of charcoal dissolves in the solvent.

  The extraction temperature is preferably set to 300 to 420 ° C. When the temperature is lower than 300 ° C., the binding force between the coal constituent molecules cannot be sufficiently reduced, so that the extraction rate of the solid phase component is lowered. On the other hand, when temperature is higher than 420 degreeC, the recombination of the radical produced | generated by the thermal decomposition reaction of coal occurs, and the extraction rate of reformed coal falls. Moreover, it is preferable to perform the pressure heat treatment of the low-grade coal and solvent slurry in an atmosphere of non-oxidizing gas. Nitrogen gas is preferably used as the non-oxidizing gas. The extraction processing time can be set to 20 to 30 minutes, for example.

  Due to the pressure heating treatment of the low-grade coal and solvent slurry in the pressure heating step 14 as described above, the soluble component of the low-grade coal is insoluble in the first liquid phase component X dissolved in the solvent and the solvent. Insoluble coal R, which is an insoluble component of low-grade coal, can be produced. These products are sent to the first separation step 15.

(Regarding the first separation step 15)
In the first separation step 15, the first liquid phase component X and the insoluble coal R are subjected to solid-liquid separation. For the solid-liquid separation method, a gravity settlement method can be used. The use of the insoluble coal R obtained by separation will be described later. The first liquid phase component X separated in the first separation step 15 can be sent to the cooling step 16 or used as a coke raw material as it is.

(About the cooling step 16)
The first liquid phase component X sent to the cooling step 16 is cooled. Here, when cooling temperature is higher than 50 degreeC, the extraction rate of the extraction coal S and the extraction coal D will fall. On the other hand, even if the cooling temperature is lower than 20 ° C., the extraction rate is not significantly improved, and the cooling time becomes longer. Therefore, the cooling temperature is preferably set to 20 to 50 ° C. In the cooling step 16, the first liquid phase component X is cooled to reform the lignite, subbituminous coal, or general coal, and the raw material for coke production, the solid fuel for the production of sintered ore, which is the raw material for the iron making process. It is intended to extract extracted coal S and extracted coal D that are useful as reducing materials for blowing blast furnace tuyere. Therefore, the cooling temperature indicates a preferable range for improving the extraction rate of the extracted coal S and the extracted coal D, and is limited to the cooling temperature as long as the extracted coal S and the extracted coal D can be extracted. It is not a thing. In addition, as a cooling method in the cooling step 16, air cooling may be used, or cooling may be performed using a cooling device capable of controlling cooling conditions such as a cooling temperature and a cooling rate.

(About the second separation step 17)
The second liquid phase component Y and the extracted coal D obtained in the cooling step 16 are solid-liquid separated in the second separation step 17. As the solid-liquid separation method in the second separation step 17, a gravity settlement method can be used. The use of the extracted coal D obtained by separation here will be described later.

(About the 3rd separation process 18)
The second liquid phase component Y separated in the second separation step 17 is sent to the third separation step 18. In the third separation step 18, the solvent contained in the second liquid phase component Y is removed. The method for removing the solvent may be an evaporation to dryness method or a spray drying method. Thereby, the extraction coal S contained in the 2nd liquid phase component Y can be extracted in a solid-phase state.

  Next, the uses of the extracted coal S, the extracted coal D, and the insoluble coal R will be described in detail. FIG. 2 is a diagram for explaining uses of the extracted coal S, the extracted coal D, and the insoluble coal R. First, the use of the extracted coal S obtained in the third separation step 18 will be described. Extracted coal S obtained by reforming inexpensive low-grade coal can be used as a raw coal for a coke production process to reduce raw material costs and improve coke strength.

  Therefore, the extracted coal S can be supplied, for example, to the coke raw coal blending unit shown in FIG. 2 and used as a coke blended coal. Thereby, the extraction coal S with a high improvement effect of coke intensity | strength can be obtained from lignite, subbituminous coal, or steam coal. Furthermore, although the effect of improving the coke strength is lower than that of the extracted coal S alone, the mixed coal S + D and the mixed coal S + R obtained by mixing the extracted coal S with the extracted coal D or the insoluble coal R in the mixing part are coke produced. It can also be used as a blended coal. Moreover, since the 1st liquid phase component X contains the extracted coal S and the extracted coal D, it can also be used as a coal blend for coke manufacture as it is, without cooling.

  Further, the extracted coal D obtained in the second separation step 17 has a microscopic pore structure, has a low combustion start temperature, and a high combustion speed, and thus has excellent combustion performance. In addition, the microporous structure is further developed by dry distillation and carbonization of the extracted coal D. Therefore, as shown in FIG. 2, the extracted coal D and the carbonized extracted coal DC obtained by carbonizing the extracted coal D in the carbonization processing unit are supplied to an iron ore sintering apparatus and used as a solid fuel for a sintered ore production process. Alternatively, it may be used as a reducing material supplied to the blast furnace and blown together with hot air from the blast furnace tuyeres. Extracted coal D and carbonized extracted coal DC are superior in combustion performance because they have a lower combustion start temperature and a higher combustion rate than the powder coke currently used as a solid fuel for iron ore sintering. Furthermore, extracted coal D and carbonized extracted coal DC are superior in combustion performance because the combustion start temperature is lower and the combustion speed is faster than pulverized coal currently used as a reducing material blown together with hot air from the blast furnace tuyeres. ing. Furthermore, although the effect of improving the coke strength is lower than that of the extracted coal S alone, the extracted coal D has the effect of improving the coke strength as well, and is supplied to the coke raw coal blending section for blending coal for coke production. Can also be used.

  The insoluble coal R obtained in the first separation step 15 has a more microscopic pore structure, has a low combustion start temperature, and a high combustion rate, and thus has excellent combustion performance. Further, by carbonizing the insoluble coal R, a microporous structure is further developed. Therefore, as shown in FIG. 2, mixed coal D + R of extracted coal D and undissolved coal R, and (D + R) C carbonized from this mixed coal D + R are obtained from the solid fuel of the sinter production process, the tuyere of the blast furnace. It can be used as a reducing material blown with hot air. Mixed coal D + R and carbonized mixed coal (D + R) C are superior in combustion performance because they have a lower combustion start temperature and a higher combustion speed than the powder coke currently used as a solid fuel in the sinter production process. . Furthermore, mixed coal D + R and carbonized mixed coal (D + R) C have lower combustion start temperature and faster combustion speed than pulverized coal currently used as a reducing material that is blown together with hot air from the blast furnace tuyeres. Excellent performance.

  When extracted coal D is used as a solid fuel for the sinter production process, it is a secondary raw material such as iron ore, limestone, and serpentine that are pulverized or adjusted to a suitable particle size as a raw material for the sinter. Then, a solid fuel such as extracted coal D is mixed, crushed, kneaded and granulated. This granulated product is charged in a layer with a predetermined thickness (for example, 500 to 700 mm), for example, on a pallet of a dwelloid type sintering machine. The ignition furnace ignites a solid fuel such as extracted coal D having a low combustion start temperature contained in the surface layer of the granulated material and having a high combustion speed and excellent combustion performance, and starts a sintering process. After ignition, the solid fuel and the volatile matter released from the solid fuel are burned while sucking air downward by a windbox, and the granulated material on the pallet is sintered and burnt by the combustion heat. Let it be a cake.

  The sintered cake obtained by the sintering process is fed from an endless pallet, and then crushed and cooled by a first crusher. Subsequently, it is further crushed by a second crusher, and a sintered ore having a predetermined particle size is obtained as a blast furnace raw material by a multistage sieve.

  On the other hand, when using extracted coal D etc. as a reducing material which blows with hot air from the tuyeres of a blast furnace, after pulverizing with a grinder, it is blown into a blast furnace with hot air from a tuyere. Reducing material heated by hot air has a lower combustion start temperature and faster combustion speed than pulverized coal, so it quickly becomes a reducing gas such as carbon monoxide and hydrogen gas, and massive iron ore charged into the blast furnace. Reduce stones, sintered ore, etc. Thereby, the combustibility at the tuyere is improved and the operability of the blast furnace can be improved.

(Embodiment 2)
Next, with reference to FIG. 3, a method for reforming biomass, which is a reforming target of the present embodiment, will be described. FIG. 3 is a process diagram showing a biomass reforming process. In the mixing step 13, the biomass supplied from the biomass tank 21 and the solvent supplied from the solvent tank 12 are mixed. In the pressure heating step 14, the mixture of the biomass and the solvent obtained in the mixing step 13 is pressurized and heated to dissolve the soluble components of the biomass in the solvent. A solvent in which a soluble component of biomass is dissolved is referred to as a first liquid phase component XB, and an insoluble component of biomass that is insoluble in the solvent is defined as a solid phase component RB. In the first separation step 15, these first liquid phase component XB and solid phase component RB are subjected to solid-liquid separation.

  In the cooling step 16, the first liquid phase component XB is cooled, and the extracted solid phase component DB (first solid phase component) that is a part of the soluble component of biomass and the remaining second liquid phase component. Get YB. In the second separation step 17, the second liquid phase component YB and the extracted solid phase component DB obtained in the cooling step 16 are subjected to solid-liquid separation. In the third separation step 18, the solvent is removed from the second liquid phase component YB separated in the second separation step 17 to obtain an extracted solid phase component SB (second solid phase component) as the remainder. That is, three different solid phase components (solid phase component RB, extraction solid phase component DB, and extraction solid phase component SB) can be obtained from a mixture of biomass and solvent. Hereinafter, although each part of a reforming process is explained in detail, explanation which overlaps with Embodiment 1 which made low grade coal the modification object is omitted.

(About biomass tank 21)
Biomass is stored in the biomass tank 21. The biomass preferably has an atomic ratio (molar ratio) of 1.42 ≦ H / C ≦ 1.78 and 0.66 ≦ O / C ≦ 0.95. As will be described later, raw material costs are reduced by obtaining raw materials that are useful as raw materials for ironmaking processes from biomass, such as raw materials for coke production, solid fuel for sinter ore production, and reducing materials for blast furnace tuyere injection. And environmental conservation.

(About solvent tank 12)
The solvent tank 12 stores a solvent for dissolving the soluble components of biomass stored in the biomass tank 21. About a solvent, since it overlaps with Embodiment 1, description is abbreviate | omitted.

  Thus, even when the modification target is biomass, the extraction rate of the solid phase component can be increased by heating and extracting the solid phase component using a solvent. Furthermore, since it is not necessary to use expensive hydrogen, a catalyst, or the like, biomass can be solubilized at an inexpensive cost to improve economic efficiency.

(About mixing step 13)
In the mixing step 13, the solvent supplied from the solvent tank 12 and the biomass supplied from the biomass tank 21 are mixed. The mixture of biomass and solvent exists in a slurry state in which biomass particles are dispersed in the solvent.

(About pressure heating process 14)
In the pressure heating step 14, the biomass and solvent slurry are heated to a predetermined extraction temperature. This heat treatment is performed in a pressurized state so that the solvent in the slurry does not reach the boiling point. Specifically, by setting the gauge pressure value to 0.8 to 2.5 MPa, it is possible to prevent boiling of the solvent and increase the extraction rate of the solid phase component. Under this pressure condition, when the temperature of the slurry (more specifically, the liquid temperature of the slurry) reaches a temperature at which the soluble component of the solid phase component is sufficiently extracted (hereinafter referred to as the extraction temperature), The solid phase component dissolves in the solvent.

  This extraction temperature is preferably 300 to 420 ° C. When the temperature is lower than 300 ° C., the binding force between the biomass constituent molecules cannot be sufficiently reduced, so that the extraction rate of the solid phase component is lowered. On the other hand, when temperature is higher than 420 degreeC, the recombination of the radical produced | generated by the thermal decomposition reaction of biomass occurs, and the extraction rate of a solid-phase component falls. Moreover, it is preferable to perform the pressurization heat processing of the slurry of biomass and a solvent in the atmosphere of non-oxidizing gas. Nitrogen gas is preferably used as the non-oxidizing gas. The extraction processing time can be set to 20 to 30 minutes, for example.

  By the pressure heating treatment of the biomass and solvent slurry in the pressure heating step 14 as described above, the first liquid phase component XB in which the biomass soluble component is dissolved in the solvent and the biomass insoluble in the solvent are removed. A solid phase component RB that is a dissolved component can be generated. These products are sent to the first separation step 15.

(Regarding the first separation step 15)
In the first separation step 15, the first liquid phase component XB and the solid phase component RB are subjected to solid-liquid separation. For the solid-liquid separation method, a gravity settlement method can be used. The first liquid phase component XB separated in the first separation step 15 can be sent to the cooling step 16 or used as a coke raw material as it is.

(About the cooling step 16)
The first liquid phase component XB sent to the cooling step 16 is cooled. The cooling temperature is preferably 20 to 50 ° C. The reason why this range is preferable is the same as in the first embodiment.

(About the second separation step 17)
The second liquid phase component YB and the extracted solid phase component DB obtained in the cooling step 16 are solid-liquid separated in the second separation step 17. As the solid-liquid separation method in the second separation step 17, a gravity settlement method can be used.

(About the 3rd separation process 18)
The second liquid phase component YB separated in the second separation step 17 is sent to the third separation step 18. In the third separation step 18, the solvent contained in the second liquid phase component YB is removed. The method for removing the solvent may be an evaporation drying method or a spray drying method. Thereby, the extraction solid phase component SB contained in the second liquid phase component YB can be extracted in a solid phase state.

  Each component separated and extracted from the biomass that is the object to be reformed by the above-described steps can be used for the same applications as the corresponding components in the first embodiment. That is, the solid phase component RB separated in the first separation step 15 corresponds to the insoluble coal R in FIG. 1, the first liquid phase component XB corresponds to the first liquid phase component X in FIG. The extracted solid phase component DB separated in the two separation steps corresponds to the extracted coal D in FIG. 1, the second liquid phase component YB corresponds to the second liquid phase component Y in FIG. The extracted solid phase components SB separated in FIG. 1 correspond to the extracted coal S in FIG. And each component obtained in this embodiment can be used for the use similar to the use of each corresponding component demonstrated in Embodiment 1. FIG.

(Embodiment 3)
Next, Embodiment 3 will be described. Embodiment 3 is characterized in that a solvent that is a combination of a solvent made of oil containing 10% by mass or more of tar acid distilled in tar distillation and a non-hydrogen-donating solvent is used as the solvent.

  The non-hydrogen donating solvent is a solvent mainly composed of bicyclic aromatics, which is purified from a dry distillation product of low-grade coal, and is a coal derivative. Since this non-hydrogen donating solvent is stable even in a heated state and has an excellent affinity with coal, the extraction rate of the solid phase component extracted into the solvent is high.

  The main components of the non-hydrogen-donating solvent include bicyclic aromatic naphthalene, methylnaphthalene, dimethylnaphthalene, trimethylnaphthalene and the like, other naphthalenes having an aliphatic side chain, biphenyl and long chain Alkylbenzenes with aliphatic side chains are included.

  The non-hydrogen donating solvent preferably has a boiling point of 180 to 330 ° C. When the boiling point is less than 180 ° C., the required pressure in the pressure heating step 14 increases, and the loss due to volatilization increases in the step of recovering the solvent, and the solvent recovery rate decreases. Furthermore, the extraction rate of the solid phase component is reduced. On the other hand, if it exceeds 330 ° C., it will be difficult to separate the solvent described later, and the solvent recovery rate will decrease.

  In the present embodiment, a solvent in which a non-hydrogen-donating solvent as described above is mixed with a solvent composed of an oil containing 10% by mass or more of tar acid distilled in the tar distillation described in Embodiment 1 is used. It is stored in the tank 12 and used as a solvent for dissolving the reforming target composed of low-grade coal or biomass.

  According to the present embodiment described above, as a solvent for dissolving the modification target, a solvent obtained by mixing a solvent made of oil containing 10% by mass or more of tar acid distilled in tar distillation and a non-hydrogen donating solvent Even in the case of using, as in the first embodiment, the extracted coal S and the extracted solid phase component SB, which are reformed products having a high effect of improving the coke strength, can be recovered in a high yield.

  Next, the present invention will be described more specifically with reference to examples.

Example 1
The effect of using a solvent composed of oil containing 10% by mass or more of tar acid distilled in tar distillation will be described in detail with reference to a comparative example. The effect was evaluated based on the recovery rate of extracted coal S, which has a high effect of improving coke strength. Tables 1A and 1B below show the recovery rate of each component by the modification treatment of the inventive example and the comparative example.

  In Invention Example 1, dried lignite L was used as the modification target. The composition of the lignite L is C: 66.8%, H: 5.1%, N: 0.6%, O: 27.5% by mass%. The reforming treatment of the lignite L is first performed by mixing the lignite L and the carboll oil in a mass ratio of 1:10, and in the pressure heating step, the heating temperature is 370 ° C. and the pressure is 2 MPa. Under the conditions, pressure heat treatment was performed for 1 hour. Next, in the first separation step, the insoluble coal R was separated by the gravity settlement method. Next, in the cooling step, the first liquid phase component X was cooled to 25 ° C. Next, in the second separation step, the extracted coal D was separated by a gravity settlement method. Next, in the third separation step, the solvent in the second liquid phase component Y was removed by evaporation to extract extracted coal S.

  The tar acid contained in the carboru oil used in Invention Example 1 is 40% by mass. Inventive Example 2 modified the lignite L in the same manner as Inventive Example 1, except that the solvent in Inventive Example 1 was changed to Solvent A containing 12% by mass of tar acid distilled by distillation of tar. In Invention Example 3, the same reforming treatment as in Invention Example 2 was carried out except that the reforming target was changed from lignite L to sub-bituminous coal N. The composition of subbituminous coal N is C: 74.3%, H: 6.0%, N: 1.4%, and O: 18.4% by mass%. In Invention Example 4, the same reforming treatment as in Invention Example 2 was performed except that the reforming target was changed from lignite L to biomass B4. The composition of the biomass B4 is C: 45.5%, H: 6.0%, N: 0.7%, and O: 47.9% by mass. In Invention Example 5, the same reforming treatment as in Invention Example 2 was carried out except that the reforming target was changed from brown coal L to a mixture N + B4 of subbituminous coal N and biomass B4. In the mixture N + B4, the mixing ratio of the subbituminous coal N and the biomass B4 was 1: 1 by mass ratio.

  In Comparative Example 1, the lignite L was reformed in the same manner as in Invention Example 1 except that the solvent in Invention Example 1 was changed to Solvent B containing 8% by mass of tar acid distilled by distillation of tar. In Comparative Example 2, lignite L was reformed in the same manner as in Invention Example 1 except that the solvent in Invention Example 1 was changed to 1-MN (methylnaphthalene). In Comparative Examples 3, 4 and 5, the same reforming treatment as in Comparative Example 1 was carried out except that the reforming target was changed from lignite L to subbituminous coal N, biomass B4 and mixture N + B4.

  As shown in Table 1A and Table 1B, in the reforming method using carboru oil and solvent A as a solvent, which is an example of the present invention, a high quality extracted coal S having a high effect of improving coke strength is used as a comparative example ( It was possible to recover with a higher yield compared to solvents B and 1-MN).

(Example 2)
Using the modified coals obtained in Invention Examples 1 to 5 and Comparative Examples 1 to 5 described above as raw materials, cokes of Invention Examples 6 to 30, Comparative Examples 6 to 30 and Reference Examples 1 to 5 were produced. The strength required for quality was evaluated. Table 2A shows the evaluation results of Invention Examples and Reference Examples, and Table 2B shows the evaluation results of Comparative Examples and Reference Examples.

In Invention Example 6, first, as a main raw material coal for producing coke, a base mixed coal in which strong caking coal and non-minor caking coal were blended at a mass ratio of 1: 1 was generated. And coke is manufactured by dry-distilling the blended coal which mix | blended base coal mixture 90 mass% and the extraction coal S obtained by the modification process of Invention Example 1 with the compounding ratio of 10 mass% with a test coke oven, and coke. A strength evaluation test was conducted. The coke was produced by charging the blended coal into a test coke oven with a filling bulk density of 0.75 g / cm ³ and dry distillation at a furnace temperature of 1000 ° C. Evaluation of coke strength is based on the drum strength of the rotational strength test method specified in JIS K2151 (percentage of the mass of coke remaining on a 15 mm sieve after coke is put in a drum test machine and the sample is 150 revolutions) DI ¹⁵⁰ ₁₅ was measured. Hereinafter, coke was prepared by the same method for the other invention examples, comparative examples, and reference examples, and the drum test was performed to evaluate the strength of the coke.

  In Invention Example 7, the blended coal in Invention Example 6 is 5% by mass of extracted coal S and 5% by mass of extracted coal D obtained by the reforming process of Invention Example 1 with respect to 90% by mass of the base mixed coal. Coke was produced in the same manner as in Invention Example 6 except that it was changed to blended coal blended at a blending ratio, and its strength was measured.

  In Invention Example 8, the blended coal in Invention Example 6 is 5% by mass of the extracted coal S obtained by the reforming process of Invention Example 1 and 5% by mass of the insoluble coal R with respect to 90% by mass of the base mixed coal. The coke was manufactured by the same method as Example 6 except that it was changed to the blended coal blended at the blending ratio, and its strength was measured.

  In Invention Example 9, the blended coal in Invention Example 6 is blended with 90% by mass of the base mixed coal and the blended coal obtained by blending the extracted coal D obtained by the reforming process of Invention Example 1 at a blending ratio of 10% by mass. Except for the changes, coke was produced in the same manner as in Invention Example 6, and its strength was measured.

  In Invention Example 10, the blended coal in Invention Example 6 was blended at a blending ratio of 10% by mass with the insoluble coal R obtained by the modification treatment of Invention Example 1 with respect to 90% by mass of the base mixed coal. The coke was manufactured by the same method as the invention example 6 except the point changed into, and the intensity | strength was measured.

  In invention examples 11, 16, 21, and 26, coke was produced in the same manner as in invention example 6 except that extracted coal S was obtained by the reforming process of invention examples 2 to 5, and the strength thereof was measured. did.

  In invention examples 12, 17, 22 and 27, coke was produced in the same manner as in invention example 7, except that extracted coal S and extracted coal D were obtained by the reforming treatment of invention examples 2 to 5, respectively. Its strength was measured.

  In inventive examples 13, 18, 23 and 28, coke was produced in the same manner as in inventive example 8, except that extracted coal S and insoluble coal R were obtained by the reforming treatment of inventive examples 2 to 5, respectively. The strength was measured.

  In invention examples 14, 19, 24 and 29, coke was produced in the same manner as in invention example 9 except that extracted coal D was obtained by the reforming process of invention examples 2 to 5, and the strength thereof was measured. did.

  In inventive examples 15, 20, 25 and 30, coke was produced in the same manner as in inventive example 10, except that insoluble coal R was obtained by the reforming process of inventive examples 2 to 5, respectively. It was measured.

  In Comparative Example 6, the blended coal in Invention Example 6 was blended with 90% by mass of the base mixed coal and the blended coal S obtained by blending the extracted coal S obtained by the modification process of Comparative Example 1 at a blending ratio of 10% by mass. Except for the changes, coke was produced in the same manner as in Invention Example 6, and its strength was measured.

  In Comparative Example 7, the blended coal in Invention Example 6 is 5% by mass of extracted coal S and 5% by mass of extracted coal D obtained by the reforming process of Comparative Example 1 with respect to 90% by mass of the base mixed coal. Coke was produced in the same manner as in Invention Example 6 except that it was changed to blended coal blended at a blending ratio, and its strength was measured.

  In Comparative Example 8, the blended coal in Invention Example 6 is 5% by mass of the extracted coal S obtained by the modification process of Comparative Example 1 and 5% by mass of the insoluble coal R with respect to 90% by mass of the base mixed coal. The coke was manufactured by the same method as Example 6 except that it was changed to the blended coal blended at the blending ratio, and its strength was measured.

  In Comparative Example 9, the blended coal in Invention Example 6 was blended with 90% by mass of the base mixed coal, and the blended coal obtained by blending the extracted coal D obtained by the modification process of Comparative Example 1 at a blending ratio of 10% by mass. Except for the changes, coke was produced in the same manner as in Invention Example 6, and its strength was measured.

  In Comparative Example 10, the blended coal in Invention Example 6 was blended with 90% by mass of the base mixed coal with the insoluble coal R obtained by the modification treatment of Comparative Example 1 at a blending ratio of 10% by mass. The coke was manufactured by the same method as the invention example 6 except the point changed into, and the intensity | strength was measured.

    In Comparative Examples 11, 16, 21, and 26, coke was produced by the same method as Comparative Example 6 except that the extracted coal S was obtained by the reforming process of Comparative Examples 2 to 5, and the strength was measured. did.

  In Comparative Examples 12, 17, 22 and 27, coke was produced in the same manner as in Comparative Example 7, except that the extracted coal S and the extracted coal D were obtained by the reforming process of Comparative Examples 2 to 5, respectively. Its strength was measured.

  In Comparative Examples 13, 18, 23 and 28, coke was produced in the same manner as in Comparative Example 8, except that the extracted coal S and the insoluble coal R were obtained by the reforming treatments of Comparative Examples 2 to 5, respectively. The strength was measured.

  In Comparative Examples 14, 19, 24 and 29, coke was produced in the same manner as in Comparative Example 9, except that the extracted coal D was obtained by the reforming process of Comparative Examples 2 to 5, and the strength was measured. did.

  In Comparative Examples 15, 20, 25 and 30, coke was produced in the same manner as in Comparative Example 10, except that the insoluble coal R was obtained by the reforming process of Comparative Examples 2 to 5, and the strength was increased. It was measured.

  In Reference Example 1, the blended coal in Invention Example 6 was blended at a blending ratio of 10% by mass without modifying the brown coal L, which is the modification target of Invention Example 1, with respect to 90% by mass of the base mixed coal. Coke was produced by the same method as in Invention Example 6 except that it was changed to blended coal, and its strength was measured.

  In Reference Example 2, coke was produced using only the base mixed coal, and the strength was measured. In Reference Examples 3 to 5, coke was produced in the same manner as in Reference Example 1 except that the lignite L of Reference Example 1 was transferred to subbituminous coal N, biomass B4, and mixture N + B4, respectively, and the strength was measured. did.

  Comparing the inventive examples and comparative examples, coke produced by adding reformed coal S, D, S + D, S + R obtained by reforming lignite L using carboru oil, solvent A as a solvent, It was found that the coke strength improvement effect was higher than that of coke produced by adding various modified coals obtained by reforming lignite L using solvents B and 1-MN as solvents.

In addition, coke produced by adding modified products S, D, S + D, S + R obtained by modifying sub-bituminous coal N, biomass B4, and mixtures thereof using solvent A is modified using solvent B. It has been found that it has a higher coke strength improvement effect than the case of tempering.
Therefore, by modifying the object to be reformed using carboru oil and solvent A, it is possible to obtain a modified product having a high effect of improving coke strength.

(Example 3)
In Example 3, the combustibility of the extracted coal D and the mixed coal D + R was evaluated. These coals were extracted from lignite L in the same manner as in Example 1. Moreover, combustibility was evaluated also about the carbonization extraction coal Dc and carbonization mixing coal (D + R) c which carbonized extraction coal D and mixed coal D + R, respectively. In addition, the same combustibility evaluation was performed also about the powder coke as a comparative example. Carbonization was performed at 750 ° C. using a kiln.

(I) Evaluation test of reaction start temperature and reaction rate maximum temperature using a thermobalance First, each sample adjusted to a predetermined particle size (0.15 to 0.25 mm) on a thermobalance is subjected to a predetermined mass. (10-20 mg) was added, the temperature was raised in an air atmosphere, and mass loss was measured. The temperature at which the mass reduction rate stably exceeded 0.002 (1 / min) was defined as the reaction start temperature and evaluated.

  In addition, the temperature at which the slope of the mass decrease curve was maximized (the temperature at which mass decrease per unit time was maximum) was defined and evaluated as the maximum reaction rate temperature.

(Ii) Sintering pan test evaluation (Production rate and yield evaluation test in the sintering process)
The test which manufactures a sintered ore with the predetermined | prescribed mixing | blending raw material was implemented using the sintering test apparatus of diameter 30cm and layer height 60cm. Each of the above samples was blended so as to be 4% by mass with respect to the raw iron ore and used as a blended raw material. After this blended raw material was charged to a height of 60 cm in the sintering test apparatus, the solid fuel on the surface of the raw material layer was ignited with a propane gas burner for 90 seconds. Thereafter, a sintering reaction was performed while suctioning air downward at a constant negative pressure of 15 kPa. After the sintered body having been subjected to the series of sintering treatments was sufficiently cooled, the sintered body was dropped four times from a height of 2 m and crushed, and those having a particle size of 5 mm or more were recovered as sintered ores. From this material balance, the production rate and yield of sintered ore were measured. Here, the production rate is obtained by dividing the mass of the sintered body by the area of the test apparatus and the firing time, and expressed as t / d / m2 as the amount of the sintered body per unit time unit area. The yield was defined by the ratio of the recovered sintered ore (+5 mm) to the charged mass.

  The evaluation was performed at the production rate and the product yield. Based on the production rate and the yield of the modified product of lignite alone (comparative example), the case of superiority to the comparative example was evaluated as ◯, and the case of superiority was evaluated as ◎. . The evaluation test results are shown in Table 3.

表３に示すように、カルボル油、溶剤Aにより抽出された抽出石炭Ｄ、炭化抽出石炭Ｄｃ、混合炭D＋R、炭化混合炭(D＋R)ｃは、粉コークスに比べて反応開始温度が低く、反応速度最大温度が低く、優れた燃焼性能を有していることがわかった。したがって、抽出石炭Ｄ、炭化抽出石炭Ｄｃ、混合炭Ｄ＋Ｒ、炭化混合炭(Ｄ＋Ｒ)ｃは、焼結鉱製造用固体燃料および高炉羽口吹込み用還元材として好適に用いることができる。また、焼結鍋試験から、固体燃料として、抽出石炭Ｄ、炭化抽出石炭Ｄｃ、混合炭Ｄ＋Ｒ、炭化混合炭(Ｄ＋Ｒ)ｃを用いることで、粉コークスに比べて生産率及び成品歩留が向上することが判った。従って、抽出石炭Ｄ、炭化抽出石炭Ｄｃ、混合炭Ｄ＋Ｒ、炭化混合炭(Ｄ＋Ｒ)ｃを焼結鉱製造プロセスの固体燃料として使用することにより、焼結鉱の生産率を向上させること
ができる。

As shown in Table 3, the extracted coal D, carbonized extracted coal Dc, mixed coal D + R, carbonized mixed coal (D + R) c extracted with carboru oil, solvent A has a lower reaction start temperature than the coke breeze. It was found that the maximum temperature temperature was low and the combustion performance was excellent. Accordingly, the extracted coal D, the carbonized extracted coal Dc, the mixed coal D + R, and the carbonized mixed coal (D + R) c can be suitably used as a solid fuel for producing sinter ore and a reducing material for blowing blast furnace tuyere. Also, from the sintering pot test, the use of extracted coal D, carbonized extracted coal Dc, mixed coal D + R, and carbonized mixed coal (D + R) c as solid fuel improves the production rate and product yield compared to powdered coke. I found out that Therefore, by using the extracted coal D, the carbonized extracted coal Dc, the mixed coal D + R, and the carbonized mixed coal (D + R) c as the solid fuel in the sinter production process, the production rate of the sinter can be improved.

11, 21 Coal tank 12 Solvent tank 13 Mixing process 14 Pressure heating process 15 First separation process 16 Cooling process 17 Second separation process 18 Third separation process

Claims (9)

  Mixing a reforming object consisting of lignite, subbituminous coal, steam coal or biomass and a solvent consisting of oil containing 10% by mass or more of tar acid distilled in tar distillation, and a mixture of the reforming object and the solvent Is heated under pressure to generate an insoluble component of the modification target and a first liquid phase component in which the soluble component of the modification target is dissolved in the solvent, and these insoluble components And the first liquid phase component are separated from each other.   Furthermore, by cooling the first liquid phase component, a first solid phase component and a second liquid phase component dissolved in the solvent are generated and separated, and the second liquid component is further separated. The method for reforming an object to be reformed according to claim 1, wherein the second solid phase component is generated by separating the solvent from the phase component.   The method for reforming an object to be reformed according to claim 2, wherein the first liquid phase component is cooled to a temperature of 20 to 50 ° C.   Use one or two of the first solid phase component and the second solid phase component obtained by the method for reforming an object to be reformed according to claim 2 as a raw material for producing blast furnace coke. A method for producing coke, characterized by:   A coke produced by using the mixture of the second solid phase component and the insoluble component obtained by the method for reforming an object to be reformed according to claim 2 as a raw material for producing coke for a blast furnace. Production method.   A solid fuel for producing a sintered ore obtained by mixing a mixture obtained by mixing the insoluble component with the first solid phase component obtained by the method for reforming an object to be reformed according to claim 2 or a carbide obtained by carbonizing the mixture. A method for producing a sintered ore characterized by being used as:   The first solid phase component or the carbide obtained by carbonizing the first solid phase component obtained by the method for reforming an object to be reformed according to claim 2 is used as a solid fuel for producing sinter ore. The manufacturing method of the sintered ore characterized by the above-mentioned.   A mixture obtained by mixing the insoluble component obtained by the method for reforming a modification object according to claim 2 with the first solid phase component, or a carbide obtained by carbonizing the mixture, is reduced for blast furnace tuyere blowing. A method of operating a blast furnace characterized by being used as a material. The carbide obtained by carbonizing the first solid phase component or the first solid phase component obtained by the method for reforming an object to be modified according to claim 2 is used as a reducing material for blowing blast furnace tuyere. A method of operating a blast furnace characterized by that.

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