JP5598191B2 - Coal storage method and storage equipment for iron making - Google Patents

Description

  The present invention can efficiently accept a plurality of metallurgical coke coking coals of different brands in a plurality of coal storage silos, and can supply coke raw coal from a coal storage silo to a blending tank without stagnation. The present invention relates to a coal storage method and storage equipment.

  In recent years, in coal-fired power plants, coal for fuel is stored in a coal storage silo, the amount of storage per unit site is increased to save space, and the generation of dust is reduced. As a method of storing coal for fuel in a coal storage silo in this coal-fired power plant, different brands of fuel coal are stored in a single coal storage silo divided into multiple layers for each brand. A method has been proposed (Patent Document 1).

In this coal storage method, the lowermost coal is cut out from the outlet provided at the lower end of the silo, but if the lowermost coal is different from the desired brand of coal, until the desired brand of coal becomes the lowermost coal Coil different from the desired brand is cut out, put into an inlet provided in the upper part of the silo by a coal transport device, and re-accommodated to improve the filling rate of the silo.

On the other hand, in the steel industry, iron-making coal is currently piled up for each brand in the open yard of the steelworks, and if the iron-making coal can be stored in silos instead of field loading, It can save a lot of space, reduce the generation of dust, and prevent coal from getting wet by rain.

However, there are always 30 brands of iron-making coal and the number of brands used is about 20, and from the viewpoint of coke quality control, the coal storage method of Patent Document 1 described above is applied to the storage of coking coal for ironmaking. Then, the following problems arise.

  1. In order to store different brands of coal in layers and store them in a coal storage silo, for example, a mixed layer in which brand A and brand B coal are mixed at the boundary between the piles of brand A and B Occurs.

  The mixed coal produced by such a mixed layer has little influence on combustibility when used as fuel for boilers in thermal power plants, but cannot be used as coking coking coal from the following points.

  That is, coke coal is produced with coke of a predetermined quality by using a blended coal obtained by accurately blending a plurality of coals having different properties and compositions. Moreover, the blending accuracy of coal is extremely important in terms of preventing clogging operation troubles during coke extrusion after carbonization in a coke oven (Patent Document 2).

  Here, considering about 70,000 tons as silos for storing coal, assuming that the inner diameter of the silo is around 40 m and the thickness (height) of the mixed layer is 0.5 m, the mixed coal in the mixed layer is 500 tons. Reach. This 500-ton mixed coal cannot be used for coke due to coke quality control. In the coke oven, the coal is carbonized in units of 25 tons, so the influence of this mixed layer is absolutely acceptable. I can't.

  2. According to the method described in Patent Document 2, when the coal of the desired brand constituting the blended coal for producing coke is not in the lowermost layer, but is present on the plural coal beds, It is necessary to cut out all the coal bed and re-inject into the silo from the inlet through the coal transport device. During that time, the desired brand of coal cannot be cut out and transported to the coke oven. It will be a hindrance.

JP 2002-302265 A JP 7-278562 A

  When storing coking coking coal for iron making in a silo, as in Cited Document 1, one brand of coal is used for storing one coal without stacking multiple brands of coal in one coal storage silo. By storing in a silo, it is possible to avoid the formation of a large amount of mixed coal that cannot be used for coke quality control in the silo.

  Then, for example, in order to be able to store 30 brands of coal, 30 coal storage silos are required. In addition, when one brand of coal is stored, another coal will not be input until the coal in the silo is finally used up, so the filling rate is low due to the amount of coal cut out. If it is left for a period of time, the use efficiency of the silo may deteriorate, and from the point of high-efficiency use of the coal storage silo equipment, the coal storage silo should be quickly emptied and another coal can be input. Is required.

By the way, if the stock of coke coal is 45 days, if it is cut out from the coal storage silo, it will become impossible to store another coal until it becomes empty even if the filling rate becomes low In order to satisfy the stockpiling amount for 45 days, it is necessary to increase the number of silos accordingly.
The object of the present invention is to quickly cut out the entire amount of coking raw material coal for iron making for each brand stored in a plurality of coal storage silos to increase the use efficiency of the coal storage silo, and to combine the coal coking coal equipment An object of the present invention is to provide a storage method and storage facility for iron-making coal that can supply coal without delay.

The present invention solves the above technical problem, and the gist of the invention is as follows.
(1) A method of storing iron-making coal in a coal storage facility equipped with a plurality of silos, in a coal receiving process that accepts a single brand of coal with respect to the silo, and in a range that can be stored in an empty silo, Cutting out the total amount of a single brand of coal stored in two or more silos, and combining these cut-out coals into a mixed coal;
A recharging step of recharging the mixed coal into an empty silo; and an external conveying step of conveying the single brand of coal cut out from the silo and / or the mixed coal outside the coal storage facility, A method for storing iron-making coal, wherein the recharging process and the external conveying process can be performed in parallel.
(2) In the mixing step, the coal to be mixed is coke raw coal, and is cut out from the silo at a constant mass speed at a predetermined mixing ratio suitable for coke production, and / or the external transport step. Is connected to a coal blending tank, the method for storing iron-making coal according to (1).
(3) In the mixing step, the coal to be mixed is a coal having properties close to each other, and the method for storing iron-making coal according to (1) or (2).
(4) The coals having similar properties are low coal content high fluidity coal classified by coal reflectance and coal flow rate, medium low coal content high fluidity coal, medium and high coal content high fluidity coal, High coalification high fluidity coal, low coalification medium fluidity coal, medium low coalification medium fluidity coal, medium and high coalification medium fluidity coal, high coalification medium fluidity coal, low coalization degree Within one of the groups of low-flowing coal, medium-coalizing low-flowing coal, and high-coalizing-low-flowing coal, or the difference in coal reflectance within the above group is within the range of 0.4. The method for storing coal for iron making as described in (3).
( 5 ) A coal storage silo group having a plurality of coal storage silos having a cutting device for accepting iron-making coal and cutting out the stored coal from the lower part, and a new storage coal to the coal storage silo. Coal receiving means for receiving each brand, first and second coal conveying means arranged below the plurality of coal storage silos and conveying the cut coal, and the first coal conveying means The coal transported by the third coal transporting means for reloading the coal transported into any one of the plurality of coal storage silos, and the coal transported by the second coal transporting means as the coal storage silo group A single brand stored in two or more coal storage silos in the coal storage silo group in a range that can be stored in an empty coal storage silo. the total amount of coal Wherein the first mixed simultaneously cut that coal conveying means and the mixing charcoal and stored by recharged The mixture charcoal to the empty coal silos by the third coal conveying means A storage facility for coal for steelmaking.
( 6 ) Coal storage silo group in which a plurality of coal storage silos having a cutting device that cuts out stored coal from the lower side and arranged in a matrix of a plurality of rows and a plurality of rows are received, and a new storage coal And a coal receiving means for receiving each brand in the coal storage silo and a plurality of coal storage silos arranged in a matrix, respectively, and arranged below each of the coal storage silos. The coal transported by the first and second coal transport means for transporting the coal, and the coal transported by the first coal transport means in each row is re-used as one of the coal storage silos in the coal storage silo group. A third coal conveying means for charging, and a fourth coal conveying means for conveying the coal conveyed by the second coal conveying means in each row to the outside of the coal storage silo group, Mixed by cutting out the total amount of coal single name stored in two or more coal silos in each column simultaneously with the first coal conveying means, the empty coal storage by the third coal conveying means A coal for iron making is characterized in that mixed coal is recharged in a silo for storage and stored, and the mixed coal cut out from the coal storage silo in which the mixed coal is stored is transferred to the fourth coal conveying means. Storage equipment.
( 7 ) The storage facility for ironmaking coal as set forth in ( 6 ), wherein the transport destination of the mixed coal by the fourth coal transport means is a coal blending tank for coke production.
( 8 ) The iron making machine as set forth in any one of ( 5 ) to ( 7 ), wherein the first conveying means and the second conveying means have the same or opposite directions for conveying coal. Coal storage equipment.

  According to the iron storage coal storage method of the present invention, for example, a plurality of iron coke coking coals of different brands are stored in silos, respectively. Among these different brands of coal, properties for maintaining the coke quality. Since several different brands of coal are recharged and stored in an empty silo as mixed coal, silos with a low coal filling rate can be actively emptied. Can be increased. As a result, even if the number of silo towers is reduced, the same amount of coal can be stored, so that the installation space for the silo group can be reduced.

  In addition, when a single brand of coal stored in a silo with a low coal filling rate is mixed with a different brand of coal stored in another silo and refilled into an empty coal storage silo, By making the properties of different brands of coal close to each other, the coke to be produced can have a desired quality.

  In addition, when multiple silos are arranged in a matrix of multiple columns and multiple rows, the single brand coal stored in the silo in each column is a coal with similar properties, and the single brand stored in the silo in the same column This makes it easy to accept and mix a single brand of coal.

  According to the iron storage coal storage facility according to the present invention, a single brand of coal stored in a silo having a low filling rate of 2 or more by first and second coal conveying means corresponding to a plurality of silos. The cutting for mixing and the cutting operation for conveying a single brand of coal or mixed coal stored in another silo to a coal blending tank for coke, for example, can be performed in parallel. The use efficiency of the silo can be increased without delaying the transportation of a single brand of coal or mixed coal to the tank.

  In addition, a plurality of brands of coal stored in a silo having a low filling rate of 2 or more are simultaneously cut out and mixed to form mixed coal, and a single brand of coal or the mixed coal is cut. If the coal conveying direction with the second conveying means used for taking out is the same direction, the third coal conveying means used for recharging the mixed coal, and a single brand of coal or the above The 4th coal conveyance means used in order to convey mixed coal to the coal blending tank for coke, for example can be arranged collectively on the coal transfer side, the 1st conveyance means and the 2nd conveyance means By making the coal transport direction opposite to the above, the coal transfer side of the third and fourth coal transport means can be arranged without making a three-dimensional intersection, and the equipment can be simplified.

The coal storage flow in the storage facility of the coal for steel which shows 1st Embodiment of this invention. The schematic block diagram of the storage facility of the coal for iron manufacture which shows 2nd Embodiment of this invention. The incidental installation of the silo for coal storage in FIG. 2 is shown, (a) is a longitudinal cross-sectional view of the silo for coal storage, (b) is a side view of the silo for coal storage. The schematic of the storage facility of the coal for iron manufacture which shows 3rd Embodiment of this invention. The schematic of the storage facility of the coal for iron manufacture which shows the modification of 3rd Embodiment. FIG. 3 is a diagram for explaining the effect of the present invention.

  Hereinafter, the present invention will be described based on embodiments shown in the drawings.

  FIG. 1 is a schematic view showing a first embodiment of a coal storage flow in the iron-making coal storage facility according to the present invention.

  In FIG. 1, the first storage silo 101 and the second storage silo 102 having the same storage capacity in the coal storage silo group have, for example, single brands with different brands unloaded from a coal carrier. And a single brand of coal are received and stored by a coal receiving conveyor E. When coking coal is received in a coal storage silo, a single brand of coal is used to maintain coke quality. The coal in the silo after acceptance is cut out on an external discharge conveyor (second coal conveyor means) B according to a coke production plan, and is supplied by a coal blending tank supply conveyor (fourth coal conveyor means) C. Transported to coal blending tank equipment. In coal blending tank equipment, after being charged into multiple coal tanks for each coal brand, a predetermined amount of coal from multiple brands is cut out from each coal tank based on the blending design, blended and mixed to produce blended coal for coke production. As a coke oven.

When the filling rate of coal i in the coal storage silo 101 and coal coal in the coal storage silo 102 is reduced due to the use of coal, the respective coals are on the mixing conveyor (first coal conveying means) A. In a predetermined ratio, coal I and coal B are mixed and conveyed to the end of the conveyor as mixed coal C. Then, this mixed coal C is transferred to a coal recharging transport conveyor (third coal transport means) D and has the same storage capacity as the first and second coal storage silos 101 and 102. Are recharged and stored in a third silo 103 for storing coal. Coal that has a different brand from that of coal to be mixed and recharged is a brand of coal with similar properties to maintain the quality of coke. This makes it possible to increase the coal filling rate of silos for storing coal while maintaining good coke quality when using coal as a blended coal for coke production, and as a result, without increasing the number of silos. The capacity of the coal storage facility can be improved. That is, when the filling rate of coal i in the coal storage silo 101 and coal silo in the coal storage silo 102 is reduced due to the use of coal, the entire amount of coal stored in the coal storage silo is cut out at once. Instead, it means that an appropriate amount is cut out as needed.

  In addition, in the case of the said embodiment, although the case of 2 types is illustrated about the coal to mix, 3 types or more may be sufficient.

  The mixed coal C in the third coal storage silo 103 is the same as the single brand coal stored in the first and second coal storage silos 101 and 102, and the external discharge conveyor (second coal). It is cut out on (conveying means) B, and further conveyed to coal blending tank equipment by a coal blending tank supply transport conveyor (fourth coal transporting means) C.

  In the lower part of the main body of the coal storage silo S, for example, as shown in FIG. 3 (a), a cutting device F for cutting coal on the mixing conveyor A or on the external discharging conveyor B, A weighing device (not shown) for measuring the cut-out amount of coal is provided, and for example, the cut-out amount (t / h) of coal per unit time can be controlled. That is, it can cut out at a constant mass speed. In addition, the stored quantity can be detected by measuring the height of stored coal.

  The mixing conveyor A and the external discharge conveyor B form a pair (hereinafter referred to as a conveyor pair) and are driven separately. For this reason, using the transport conveyor A for mixing and the transport conveyor D for recharging the coal, coal is cut out, mixed with other brands of coal, and the resulting mixed coal is recharged into the coal storage silo. Then, using the external discharge conveyor B and the coal blending tank transport conveyor C, a single brand of coal can be cut out and supplied to the coal blending tank equipment as it is.

  The conveyor pair may be a single row or a plurality of rows, and a plurality of coal storage silos are arranged immediately above each row.

  When coal storage silos are arranged in a matrix with multiple columns and multiple rows, the mixed coal mixed in each column may be recharged into an empty coal storage silo in that column, and other columns. May be recharged into an empty coal storage silo.

  By the way, there is a limit to the cutting accuracy of the cutting device provided in the lower part of the coal storage silo (5 to 10%), and mixing coal with significantly different properties may lead to fluctuations in the properties of the mixed coal. Therefore, it is desirable to limit the coal to be mixed to those having similar properties.

  When coal of different brands is cut out and mixed on the conveyor A for mixing, the coals of different brands are, for example, in the same group of the raw coal classification in the Japan Iron and Steel Institute Coal Coal Classification Table shown in Table 1 By doing so, fluctuations in coke quality can be minimized.

Table 1 shows that the vertical classification is coal flow rate MF, and the horizontal classification is coal reflectance R _O, and the coal reflectance R _O is 0.7 or less, 0.7 to 1 .1 range is medium-low coalification degree, 1.1-1.5 range is medium-high coalification degree, 1.5-1.9 range is high coalification degree, coal fluidity MF is 0.5 The following is a low fluidity, 0.5 to 2.5 is a medium fluidity, and 2.5 to 3.5 is a high fluidity, and coal is classified according to these combinations. For example, if the coal reflectance R _O is 1.3 and the coal fluidity MF is 3.0, it is classified as a medium-high coalification high-fluidity coal. Incidentally, as seen in the coal reflectance R _O, each group of coking coal classification is in the range of 0.4 except for the low coalification degree coal. On the other hand, if the difference in the coal reflectivity R _O of a plurality of coals is within 0.4, it is considered that the influence on the coke quality is small. May be. In this case, it depends on the mixing accuracy, the allowable range of quality fluctuation of the coke to be manufactured, and the like.

  In FIG. 1, when the coal filling rate in the first coal storage silo 101 is high and the coal filling rate in the second coal storage silo 102 is low, the cutting ratio of coal coal and coal loro is the same. When the coal coal and coal coal are mixed until the second coal storage silo 102 is emptied, the second coal storage silo 102 is emptied, and the filling rate of coal coal in the first coal storage silo 101 is obtained. Becomes lower.

  Here, the coal i of the first coal storage silo 101 having a low filling rate and the coal of the other fifth coal storage silo (not shown) in the same row are mixed with the conveying conveyor A for mixing at a constant ratio. The mixed coal can be recharged into the second coal storage silo 102 that has been emptied, for example. In this way, the coal in the plurality of coal storage silos arranged in the same row can be used without leaving the coal in the coal storage silo by appropriately combining and setting the cutting ratio, so that The coal storage silo can be emptied, and the emptied coal storage silo can be used as a new coal receiving silo or a mixed coal recharging silo.

  At the start of operation of this silo type coal storage facility, all coal storage silos shall accept coal simultaneously from the point of view of coal handling facilities and port facilities when coal is unloaded from the carrier. In order to receive coal one by one into the coal storage silo, for example, there are still many empty coal storage silos at the time when the coal is received into two or three coal storage silos. Therefore, by using these empty coal storage silos and mixing coals of similar properties, remixing the coal and accepting new coal, for example, 30 brands, brands used 20 brands of coal can be stored in a coal storage silo.

  On the other hand, when a single coal in the fourth coal storage silo 104 can be supplied to the blending tank equipment, it is cut out not to the mixing conveyor A but to the external discharge conveyor B to supply the coal blending tank. It can be supplied to the coal blending tank facility via the transfer device C. In addition, when the coal in the fourth coal storage silo 104 is not for coke production, for example, when used for other purposes for iron making such as blast furnace blowing pulverized coal or sintering carbonaceous material, It is sent from the external discharge conveyor B to the intended processing facility via the coal blending tank supply conveyor C.

Second Embodiment FIG. 2 and FIG. 3 show a second embodiment of the present invention, FIG. 2 shows a schematic configuration of a coal storage facility composed of a coal storage silo group for iron making, and FIG. 3 shows an outline of the coal storage silo. It is a figure which shows a structure.

  In the second embodiment, in a coal storage silo facility composed of coal storage silos having, for example, a 5 × 6 matrix of coal storage silos S having the same storage capacity, each row of coal storage silos S Below, as shown in FIG. 3 (a), two mixing conveying conveyors A (A1, A2) and two external conveying conveyors B (B1, B2) are arranged in parallel, Coal cut from the coal storage silo S is conveyed in the same direction.

In the lower part of the coal storage silo S, coal cutting devices F are provided corresponding to the respective transport conveyors A (A1, A2) for mixing and the respective transport conveyors B (B1, B2) for external discharge. By driving the coal cutting device F (F ₁ , F ₂ , F ₃ , F ₄ ), the coal in the coal storage silo S is cut out to the lower conveyors A (A1, A2) and B (B1, B2). be able to.

  Further, a branch receiving device G is arranged above the coal storage silo S in each row, and this branch receiving device G is connected to the coal receiving transport conveyor E and the mixing transport conveyor A via the main transport conveyor H. Connected to allow new coal to be accepted or mixed coal to be re-accepted. As an example of the branch receiving device G, for example, as shown in FIG. 3 (b), a switching device 12 is arranged immediately above each coal storage silo S adjacent in the column direction, and the first switching device 12 is connected via the switching device 12. 1 conveyor 10 and 2nd conveyor 11 are arrange | positioned in a line along the row direction. In the example of FIG. 3B, the first conveyor 10 is disposed on the upstream side in the coal conveyance direction, the second conveyor 11 is disposed on the downstream side, and the switching device 12 is disposed below the conveyance terminal portion of the first conveyor 10. Is arranged, and the conveyance start end of the second conveyor 11 is disposed below the second outlet 12a of the switching device 12, and the first outlet 12b of the switching device 12 is connected to the coal inlet 13 of the coal storage silo S. Deploy.

  When the coal transported from the first conveyor 10 is received by the coal storage silo S using the branch receiving device G, the switching device 12 is switched to the first outlet 12b side, and the switching device 12 is the first outlet. From 12b, coal is introduced into the inlet 13 of the silo S for storing coal. On the other hand, when the coal is received in another coal storage silo S located on the downstream side in the transport direction from the coal storage silo S, the switching device 12 is switched to the second outlet 12a side, and the second It supplies to the 2nd conveyor 11 from the exit 12a of this, and it conveys toward the other silo S for coal storage located in the adjacent conveyance direction downstream.

  The branch receiving devices G arranged above the plurality of coal storage silos S in each row are used for mixing via the main conveying conveyor H via the coal receiving conveying conveyor E and the coal recharging conveying conveyor D. It is connected to the conveyor A. The main transport conveyor H is connected to the branch receiving device G in each row, and a coal transport switching device is arranged at this connection point. The coal transported from the main transport conveyor H by the coal transport switching device is arranged in an arbitrary row. It can be conveyed to the branch receiving device G. This coal conveyance switching device may have any configuration. For example, the same device as the switching device 12 used in the branch receiving device G shown in FIG. In addition, the said branch acceptance apparatus G shows an example of embodiment of this invention, and is not limited to an above-described structure.

  Hereinafter, when the plurality of coal storage silos are arranged in a matrix of a plurality of rows and a plurality of rows, the first row of conveying conveyors A is indicated by 1A, and the first row of external discharging conveyors B is indicated by 1B. Similarly, a row number is given before A and B to the conveyors A and B of each row.

  The conveying conveyors 1A to 5A arranged below the respective coal storage silos in each row, the conveying terminal portion extends to the upstream of the conveying start end portion of the coal recharging conveying conveyor D, and is at least two or more. Coal of different brands is cut out from the coal storage silo on the mixing conveyors 1A to 5A to be in a mixed state, and this mixed coal is further conveyed to the main conveyor H by the coal recharging conveyor D. The main transport conveyor H is connected to a branch receiving device G arranged above each coal storage silo in each row by a coal transport switching device, and the coal transported from the main transport conveyor H is arbitrarily selected by the coal transport switching device. It is made to convey to the branch acceptance apparatus G of a row | line, and mixed coal can be supplied to the arbitrary coal storage silos S of the said row | line | column.

  In the embodiment of the present invention shown in FIG. 2, the coal is conveyed to the branch receiving device G in each row by one coal re-loading conveyer D and the main conveyer H.

  Here, when the tank in which the coal to be mixed is stored is on the same conveying conveyor A, the mixing operation is performed on the conveying conveyor A for mixing, and the mixed coal is conveyed on the conveying conveyor for coal recharging. D, stored again via the main conveyor H and the branch receiving device G. Moreover, when it exists on the different conveyance conveyor A, after conveying each conveyance conveyor A, it will be mixed on the conveyance conveyor D for coal recharging.

  In addition, when the mixed coal is reloaded into a specific coal storage silo, new coal cannot be received from the coal receiving transport conveyor E into the other coal storage silos. However, when a plurality of coal re-loading conveyors D and main conveyors H are provided for each row or group row, the mixed coal is transported from the plurality of mixing conveyors A at the same time. It is possible to supply to the conveyor D. If two main transport conveyors H, a main transport conveyor for coal recharging and a main transport conveyor for receiving coal, are provided, the recharging operation of mixed coal and a new coal receiving operation can be performed simultaneously.

  Next, the conveyance end of the external discharge conveyors 1B to 5B extends to the upstream of the coal blending tank supply conveyor C, and is recharged with a single brand of coal received in each coal storage silo S. The mixed coal consisting of a plurality of brands of coal is supplied to the coal blending tank conveyor C. In addition, the coal transfer side of the conveyance conveyor C for coal mixing tanks is three-dimensionally crossed with respect to the conveyance conveyors 1A to 5A for mixing.

  In the case of the embodiment of the invention shown in FIG. 2, since there is only one coal-conveying tank transport conveyor C, all five rows of external discharge conveyors 1B to 5B are simultaneously transported to a plurality of external discharge conveyors. Coal is not supplied from the conveyor B to the coal-conveying tank transport conveyor C, and the coal is supplied from the other external discharge conveyor B until the coal supply from one specific external discharge conveyor B is completed. Coal is not supplied to the conveyance tank C for the mixing tank. However, when a plurality of coal blending tank conveyors C and switching devices are provided for each column or each group column, mixed coal is simultaneously supplied to the coal blending tank conveyor C from a plurality of external discharge conveyors. It is possible to supply coal.

  The coal conveyor tank conveyor C supplies mixed coal to the coal tank facility I. In the coal blending tank facility I, a plurality of coal blending tanks 20 with fixed quantity cutting devices are arranged in a matrix, and coal transport conveyors 21 are provided below the coal blending tanks 20 in each row. These plural rows of coal transport conveyors 21 transport simple coal delivered from the coal blending tank 20 or coal mixed by the mixing operation in the same direction, and supply it to the blended coal discharge conveyor 22 disposed at the transport end. To do. The blended coal on the blended coal discharge conveyor 22 is sent to, for example, a pulverization processing facility or the like for charging into the coke oven.

  Coal receiving conveyors 23 are arranged above the coal blending tanks 20 in each row so that the coal from the coal blending tank transport conveyor C can be received in any coal blending tank 20.

  In the coal storage silo facility shown in FIG. 2, it is preferable to accept coals having different properties but having similar properties (for example, the same group in Table 1) in each row of coal storage silos S. This facilitates the mixing and recharging process.

  The coal storage silo facility shown in FIG. 2 can accept up to 30 brands of coal. Since coke production generally contains about 20 brands of coal, it can be said that it has a sufficient number of silos. Prior to the carbonization treatment in the coke oven, the coal is mixed with, for example, 20 types of different brands according to a preset composition so as to obtain a desired coke strength and coke with a coke component. This blending process is performed by transporting predetermined coal to the coal blending tank 20 of FIG. 2 and cutting it at a predetermined T / H according to the blending ratio.

Third Embodiment FIG. 4 shows a third embodiment of the present invention.

  In the second embodiment shown in FIG. 2 described above, the conveying direction of the coal cut out by the conveying conveyor A for mixing and the conveying conveyor B for external discharge is the same direction, but in this embodiment, the conveying conveyor for mixing is used. The conveying direction of the cut-out coal A and the conveying direction of the cut-out coal of the external discharge conveyer B are opposite directions.

  Thus, since the conveyance termination of the conveyance conveyor A for mixing and the conveyance termination of the conveyance conveyor B for external discharge were made into the opposite direction in the row | line | column direction of the coal storage silo S, the conveyance conveyor C for coal mixing tanks and coal re-mounting It is possible to avoid the coal transfer portion with respect to the incoming transport conveyor D from being concentrated on one side as in the second embodiment, and the silo equipment for storing coal can be simplified as a whole. In the second embodiment, the coal transfer side of the coal blending tank transfer conveyor C to which the coal from the external discharge transfer conveyors 1B to 5B is transferred is three-dimensional with respect to the mixing transfer conveyors 1A to 5A. Although intersecting, in this embodiment, there is no such a three-dimensional intersection, and the configuration can be simplified.

  As a modification of the third embodiment, as shown in FIG. 5, the conveying directions of the mixing conveyors 1A to 5A and the external discharging conveyors B1 to B5 are not limited to the normal conveying direction shown in FIG. The coal can be conveyed in the reverse conveyance direction on the opposite side, the coal is supplied to the coal mixing tank conveyance conveyor C by the mixing conveyance conveyors 1A to 5A driven in the reverse conveyance direction, and the external discharge driven in the reverse conveyance direction You may enable it to supply coal to the conveyance conveyor D for coal reloading by the conveyance conveyors B1-B5. In this case, for example, even if any one of the conveying conveyors 1A to 5A for mixing and the conveying conveyors B1 to B5 for external discharge breaks down, as an emergency measure, the conveying conveyors for mixing 1A to 5A that are not broken or for external discharging Coal mixing and external discharge operations can be performed by forward transport driving and reverse transport driving of the transport conveyors B1 to B5.

  In the second embodiment and the third embodiment described above, an example in which 30 coal storage silos S having the same storage capacity are arranged has been shown, but when the coal in these coal storage silos is mixed and recharged The effect will be described below in a simplified manner in the case of four units as shown in FIG.

  Consider an initial state in which four silos (tanks) a, b, c, and d shown in FIG. 6 have filling rates of 0, 30, 60, and 100%, respectively. In the comparative example (conventional method), only the empty tank a is filled. In this case, the overall filling rate is restored from the initial 45% to 70%.

  On the other hand, in the embodiment of the present invention, first, the coals in the tanks b and c are mixed and transferred to the tank a, and then both the tanks b and c emptied by the operation are filled with coal. . In this case, the filling rate is restored from the initial 45% to 95%. From the above, it can be seen that the effect of improving the filling rate by the embodiment of the present invention is remarkable.

  In each of the above-described embodiments, the conveying conveyor A for mixing, the conveying conveyor B for external discharge, the conveying conveyor C for coal blending tank, the conveying conveyor D for coal recharging, the conveying conveyor E for receiving coal as coal conveying means. The branch receiving device G and the main transfer conveyor H are shown, but these transfer means only have to be configured to transfer coal, and any means can be used as long as coal transfer between the transfer means is possible. good. Further, the branch receiving device G may have any configuration as long as the transported coal can be input to an arbitrary coal storage silo S.

A: Conveyor for mixing (first coal conveying means)
B: Conveyor for external discharge (second coal conveying means)
C: Conveyor for coal blending tank (fourth coal conveying means)
D: Conveyor for recharging coal (third coal conveying means)
E: Coal receiving conveyor F: Coal cutting device G: Branch receiving device H: Main transporting conveyor I: Coal mixing tank equipment S: Coal storage silo 10, 11: Conveyor 12: Switching device 12a, 12b: Exit 13: Coal inlet 20: Coal blending tank 21: Coal blending tank conveyor 22: Blended coal discharge conveyor 23: Conveyor for receiving coal

Claims (8)

A method of storing iron-making coal in a coal storage facility equipped with a plurality of silos,
A coal acceptance process that accepts a single brand of coal for the silo;
In a range that can be stored in an empty silo, a mixing step of cutting out the entire amount of a single brand of coal stored in two or more silos, and combining these cut-out coals into a mixed coal;
A recharging step of recharging the mixed coal into an empty silo;
The single brand coal and / or the mixed coal cut out from the silo comprises an external transport process for transporting the coal storage facility outside the coal storage facility, and the recharging process and the external transport process can be performed in parallel. A method for storing coal for iron making.   In the mixing step, the coal to be mixed is coke raw material coal, which is cut out from the silo at a constant mass rate at a predetermined mixing ratio so as to be suitable for coke production, and / or the external transport step is coal blending. It connects to a tank, The storage method of the coal for iron manufacture of Claim 1 characterized by the above-mentioned.   3. The method for storing coal for iron making according to claim 1, wherein in the mixing step, coals to be mixed are coals having properties close to each other.   The coals with similar properties are classified into low coality high fluidity coal, medium low coalification high fluidity coal, medium and high coalification degree high fluidity coal, and high coalization. High fluidity coal, low coalification medium fluidity coal, medium low coalification medium fluidity coal, medium high coalification medium fluidity coal, high coalification medium fluidity coal, low coalization low fluidity The difference in coal reflectivity is within the range of 0.4 within the group of any one of coal, medium coal low flow coal, high coal low flow coal, or even above the group The storage method of the coal for iron manufacture of Claim 3. A coal storage silo group that includes a plurality of coal storage silos that receive iron-making coal and have a cutting device that cuts out stored coal from below;
Coal receiving means for receiving new storage coal for each brand into the coal storage silo;
First and second coal conveying means arranged below the plurality of coal storage silos for conveying the cut coal;
A third coal conveying means for re-charging the coal conveyed by the first coal conveying means into any one of the plurality of coal storage silos;
A fourth coal conveying means for conveying the coal conveyed by the second coal conveying means to the outside of the coal storage silo group;
With
In the range that can be stored in an empty coal storage silo, all the single brand coal stored in two or more coal storage silos in the coal storage silo group is simultaneously cut into the first coal transport means. A coal storage facility for iron making, wherein the mixed coal is mixed by taking out into mixed coal, and the mixed coal is recharged and stored in the empty coal storage silo by the third coal conveying means. A coal storage silo group in which a plurality of coal storage silos having a cutting device that cuts out stored coal from the bottom and arranged in a matrix of a plurality of columns and a plurality of rows are received while accepting iron-making coal;
Coal receiving means for receiving new storage coal for each brand into the coal storage silo;
1st and 2nd coal conveyance means which is respectively arranged under a plurality of coal storage silos in each row of the coal storage silo group arranged in the matrix, and conveys the cut coal,
Third coal conveying means for recharging the coal conveyed by the first coal conveying means of each row into any one of the coal storage silos in the coal storage silo group;
A fourth coal conveying means for conveying the coal conveyed by the second coal conveying means in each row to the outside of the coal storage silo group;
With
The entire amount of single-brand coal stored in two or more coal storage silos in each row is mixed by cutting out to the first coal conveying means at the same time, and empty coal is mixed by the third coal conveying means. For storing steel, wherein the mixed coal is recharged and stored in a storage silo, and the mixed coal cut out from the coal storage silo in which the mixed coal is stored is transferred to the fourth coal conveying means. Coal storage equipment. The storage facility for coal for iron making according to claim 6 , wherein the transport destination of the mixed coal by the fourth coal transport means is a coal blending tank for coke production. The said 1st conveyance means and the said 2nd conveyance means made the conveyance direction of coal the same direction or the reverse direction, The storage equipment of the coal for iron manufacture in any one of Claim 5 to 7 characterized by the above-mentioned. .

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