Two-stage coal blending system based on coking coal graded and quality-divided crushing

Abstract

The utility model discloses a two-stage coal blending system based on coking coal grading and grading crushing, and belongs to the technical field of coal storage and blending. The coal blending system comprises a hard coal silo, a two-stage screening and crushing mechanism, a coal blending bunker and a coal bunker, a discharging port of the hard coal silo is connected with a feeding port of the first-stage screening and crushing mechanism through a belt, and a discharging port of the first-stage screening and crushing mechanism is connected with a feeding port of the coal blending bunker through a belt; a discharging port of the coal blending bin is connected with a feeding port of the second-stage screening and crushing mechanism through a belt, and a discharging port of the second-stage screening and crushing mechanism is connected with a feeding port of the coal bin through a belt. By adopting the coal blending system disclosed by the utility model, the characteristics of various coals are effectively utilized, and various coking coals are matched according to a proportion, screened and then crushed, so that the mixing uniformity of the coals is improved, the phenomenon of coarse coal leakage in the coal blending process is improved, the coke quality is improved, and the coal blending cost is also reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal storage and blending, and more specifically relates to a secondary coal blending system based on grading, quality-based and crushing of coking coal. Background Art

[0002] Silos are large-scale devices used to store and easily unload bulk materials. They are also the main facilities used by coking enterprises to store raw coal in recent years. Raw coal silos are cylindrical structures built of reinforced concrete, with a volume of thousands to tens of thousands of cubic meters. The internal structure varies slightly depending on the capacity. The upper part of the silo is equipped with a ring-type coal distributor for coal distribution, the lower part is equipped with a ring-type coal unloader for coal discharge, and a dust collector is installed to prevent dust from overflowing from the silo. It is a relatively closed container.

[0003] Silos are currently used in the coal blending of coking enterprises. They have a small footprint and large coal storage capacity. They can replace traditional coal blending silos for coal blending, realizing storage and storage integration, and have good application effects. Therefore, they are widely used in the coking industry. However, silos also have the disadvantage of poor coal blending uniformity, because coal blending is usually carried out according to the first-in-first-out principle, and the coal cannot be mixed before blending. Traditional coal yards and stackers can mix the coal in the coal yard and adopt the method of flat laying and direct taking. When taking coal, the properties of the piled coal can be blended to the greatest extent, and the quality of the coal is stable. Therefore, it is necessary to improve the existing coal blending method of silos.

[0004] In the coking industry, the process of mixing gas, fat, coke, lean coal and other types of coal and then crushing them is a relatively traditional process. In actual application, it is found that whether it is ramming coking or top loading coking, the large and fine particles of hard coal such as gas and lean coal cannot be evenly mixed, and the phenomenon of "coarseness" will occur during storage and transportation, making it easy for coarse and fine particles of coal to separate, which affects the quality of the final coke product.

[0005] As for top-loading coking, although more strongly adhesive coal types are used and the density of coke is increased, there are still individual honeycombs and particles, and the "coarseness" phenomenon is still difficult to avoid.

[0006] After searching, the Chinese patent authorization announcement number is CN 101081989 B. The invention title is a method for blending coking coal. The patent document discloses the steps of blending each single type of coking coal; the single type of coking coal includes: gas fat coal, fat coal, 1 / 3 coking coal, coking coal, and lean coal; the characteristic interval and characteristic interval concentration of the vitrinite reflectance distribution of each single type of coking coal meet the requirements; the weight percentage of each single type of coal is: gas fat coal: 5-10%; fat coal: 5-20%; 1 / 3 coking coal: 30-45%; coking coal: 30-45%; lean coal: 10-18%. The coal blending method of this patent can make reasonable use of coking coal resources and accurately blend coal, thereby improving the quality of coke. However, the coal blending method disclosed in the patent document requires relatively large adjustments to various equipment in the coking plant, and the improvement cost is also high. In actual operation, it is more common for coking plants to blend coal according to coal types and price ranges, and coal blending in the above-mentioned manner is rarely performed, and its practicality is relatively poor. Therefore, in the actual coal blending process in coking plants, the "coarse coal" phenomenon is still relatively significant, thereby affecting the quality of the coke finally produced.

[0007] For another example, the system disclosed in the patent document with the patent application publication number CN 115140571 A and the invention name being a system for a coal blending process for an integrated silo for coking storage and blending includes a concrete silo, the bottom of which is a W-shaped section, a ring-slit coal outlet is provided along the circumference of the bottom of the W-shaped section, a wear-resistant metal lining is installed on the outer circumference of the ring-slit coal outlet, a coal plow car is installed below the ring-slit coal outlet, the coal plow car is an annular box-type rotating body structure, the top of the coal plow car is connected to one end of the coal plow car sealing cover, and the other end of the coal plow car sealing cover is connected to the bottom of the W-shaped section, one or two anti-blocking coal plow claws are installed on the coal plow car, and the anti-blocking coal plow claws are inserted into the annular coal supporting platform at the bottom of the concrete silo, and the anti-blocking coal plow claws are respectively installed with ring-slit coal outlets at positions near the outer circumference and inner circumference of the ring-slit coal outlet. The outer circumferential scraper of the coal mouth and the cylindrical scraper of the inner circumferential side of the annular seam coal outlet are installed under the coal plow car. The coal plow car is a ring-shaped box-type rotating body structure. The upper and outer edges of the coal tray of the coal plow car are equipped with a coal plow car sealing cover. The coal outlet of the coal plow car is connected to a coal flow leveling guide plate. Two sets of electro-hydraulic coal plows are symmetrically installed on the coal plow car. A video surveillance camera of the coal plow car's coal drop pipe is installed under the coal plow car. The video surveillance camera of the coal plow car's coal drop pipe is aimed at the inlet of the coal plow car's coal drop pipe. Two closed weighing coal feeders are installed under the coal plow car. The two sets of electro-hydraulic coal plows correspond to the two closed weighing coal feeders respectively. The coal plow car, the coal plow car, the closed weighing coal feeder and the video surveillance camera of the coal plow car's coal drop pipe are all connected to the electric control system. The technical solution provided by this patent document can only solve the problem of coal uniformity under the silo, but it is difficult to solve the problem of uneven mixing of coal materials themselves.

[0008] Therefore, a new type of coal blending system is urgently needed to solve the "coarse coal running" phenomenon existing in the existing coal blending process with lower cost and higher coal blending flexibility. Summary of the invention

[0009] 1. Problems to be solved

[0010] In view of the problem that the "coarseness" phenomenon is still quite significant in the existing coal blending process, thus affecting the quality of the coke finally produced, the utility model provides a two-level coal blending system based on the grading and quality-based crushing of coking coal. Various coking coals can be blended in proportion and first screened and then crushed, thereby improving the mixing uniformity of the coal material itself, improving the "coarseness" phenomenon, and improving the quality of the coking coal.

[0011] 2. Technical solution

[0012] To solve the above problems, the utility model adopts the following technical solutions.

[0013] The utility model discloses a two-stage coal blending system based on the classification and quality-based crushing of coking coal, comprising a hard coal silo, a two-stage screening and crushing mechanism, a coal blending bin and a coal bin;

[0014] The discharge port of the hard coal silo is connected to the feed port of the first-stage screening and crushing mechanism through a belt, and the discharge port of the first-stage screening and crushing mechanism is connected to the feed port of the coal distribution bin through a belt;

[0015] The coal distribution bunker discharge port is connected to the second-stage screening and crushing mechanism feed port through a belt, and the second-stage screening and crushing mechanism discharge port is connected to the coal bunker feed port through a belt.

[0016] As a further improvement of the utility model, it also includes a third belt, which is used to transport soft coal. The third belt is arranged between the first-stage screening and crushing mechanism and the coal blending bin to transport the soft coal to the soft coal blending bin.

[0017] As a further improvement of the utility model, the first-stage screening and crushing mechanism includes a primary ultrafine screen and a first crusher. The feed port of the primary ultrafine screen is connected to the discharge port of the hard coal silo through a belt, the coarse particle discharge port of the primary ultrafine screen is connected to the feed port of the first crusher through a belt, and the fine particle discharge port of the primary ultrafine screen is connected to the feed port of the coal distribution bin through a belt.

[0018] As a further improvement of the present invention, the primary ultrafine screen adopts any one of a cross screen and a roller screen, and the aperture is set to 2-5 mm.

[0019] As a further improvement of the utility model, the second-stage screening and crushing mechanism includes a secondary ultrafine screen and a second crusher. The feed port of the secondary ultrafine screen is connected to the discharge port of the coal distribution bin through a belt, the coarse particle discharge port of the secondary ultrafine screen is connected to the feed port of the second crusher through a belt, and the fine particle discharge port of the secondary ultrafine screen is connected to the feed port of the coal bin through a belt.

[0020] As a further improvement of the present invention, the secondary ultrafine screen adopts any one of a cross screen and a roller screen, and the aperture is set to 4-6 mm.

[0021] As a further improvement of the present utility model, at least one hard coal silo is provided.

[0022] As a further improvement of the present invention, the coal distribution bunker includes a hard coal distribution bunker and a soft coal distribution bunker, and at least one of the hard coal distribution bunker and the soft coal distribution bunker is provided.

[0023] As a further improvement of the present invention, the hard coal includes gas coal, lean coal, and poor lean coal; the soft coal includes coking coal, fat coal, and gas fat coal.

[0024] As a further improvement of the utility model, the single-bin capacity of the hard coal silo is 5000m 3 ~20000m 3 .

[0025] 3. Beneficial effects

[0026] Compared with the prior art, the beneficial effects of the utility model are:

[0027] (1) The utility model is a two-stage coal blending system based on the grading and quality-based crushing of coking coal. By setting a hard coal silo, a two-stage screening and crushing mechanism, a coal blending bin and a coal bin, it can effectively group and crush different types of coal according to their characteristics, and then blend the coal after crushing. It has the significant advantages of saving investment and reducing costs. At the same time, it reduces the "coarseness" phenomenon, makes the blended coal fineness range more concentrated, significantly improves the mixing uniformity of the coal material itself, makes the coke quality more stable, and also reduces the coal blending cost.

[0028] (2) The utility model is a two-stage coal blending system based on the classification and quality crushing of coking coal. By setting up a two-stage screening and crushing mechanism, the hard coal is first screened separately and then crushed, which can reduce the crushing energy consumption and production cost compared with direct full crushing. At the same time, the hard coal types that have been pre-crushed in the coal blending bin will not be mixed unevenly, and will not have the phenomenon of segregation. The properties are more consistent. After being mixed in the coal blending bin according to the final coal blending ratio, it is transported to the lower belt and transported to the final selective crushing process.

[0029] (3) The utility model is a two-stage coal blending system based on the grading and quality-grading crushing of coking coal. After the hard coal reaches the specified particle size, it is sent to the coal blending bin and mixed with other types of coal to form the final mixed coal. The mixed coal then enters the top of the secondary ultra-fine screen for final screening. The coal particles on the screen enter the final crusher for crushing. The crushed coal particles are mixed with the coal particles under the screen on the belt behind the crusher. After more than two transfers on the subsequent conveyor belt, they are evenly mixed and sent to the coal tower as coal material for the coke oven. The final crushing ensures the crushing effect and the particle size control effect is good.

[0030] (4) The utility model is a two-stage coal blending system based on the classification and quality crushing of coking coal. The ultra-fine screening cross screen and roller screen used in the utility model can dynamically adjust the aperture and the fineness of the coal to be crushed, and transport it to the crusher at the same time. In terms of operation and maintenance, the workload of the pre-crusher is reduced, and the replacement cycle is virtually extended.

[0031] (5) The utility model is a two-stage coal blending system based on the grading and quality-grading crushing of coking coal. For hard coal, the aperture of the ultrafine screen is set to 2-5 mm. In addition, more optimally, for gas coal and 1 / 3 coking coal, the aperture of the primary ultrafine screen can be set to 3-5 mm, and for lean coal and poor lean coal, the aperture of the primary ultrafine screen can be set to 2-4 mm, so as to obtain a finer fineness of the lean coal and poor lean coal.

[0032] (6) The utility model is a two-stage coal blending system based on the classification and quality-based crushing of coking coal. Since the proportion of hard coal in the second crushing is relatively small, most of it passes through the secondary ultra-fine screen as undersize and directly enters the next conveyor belt, so the crushing work required for high-quality coking coal in the second crushing is relatively small. Therefore, the sieve hole diameter of the secondary ultra-fine screen is generally set to 4-6 mm to ensure that part of the high-quality coking coal, such as coking coal and fat coal, can be used as furnace coal for coking without being crushed.

[0033] (7) The utility model is a two-stage coal blending system based on the grading and quality-based crushing of coking coal. It has wide adaptability and can be used for coal blending in all silos or in some silos and coal yards. During the design, only one coal blending silo needs to be added, which requires a small investment and low operating cost. It can effectively improve the quality of coal blending, reduce the cost of coal blending, and thus improve the quality of coke. It is especially suitable for coal blending transformation by adding a new silo on the basis of an existing coal blending silo. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of a two-level coal blending system based on the classification and quality-based crushing of coking coal in the utility model;

[0035] In the figure:

[0036] 101. First hard coal silo; 102. Second hard coal silo;

[0037] 201, first belt; 202, second belt; 203, third belt; 204, fourth belt; 205, fifth belt; 206, sixth belt; 207, seventh belt;

[0038] 301, primary ultrafine screen; 302, secondary ultrafine screen;

[0039] 401, first hard coal distribution bunker; 402, second hard coal distribution bunker; 403, first soft coal distribution bunker; 404, second soft coal distribution bunker;

[0040] 501, first crusher; 502, second crusher;

[0041] 6. Coal bunker; DETAILED DESCRIPTION

[0042] The utility model is described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] Example 1

[0044] Combination Figure 1 As shown, a two-stage coal blending system based on the classification and quality-based crushing of coking coal in this embodiment includes a hard coal silo, a two-stage screening and crushing mechanism, a coal blending bin and a coal bin 6, which can effectively group and crush different types of coal according to their characteristics, and then blend the coal after crushing, which has the significant advantages of saving investment and reducing costs. At the same time, it reduces the "coarse" phenomenon, makes the blended coal fineness range more concentrated, significantly improves the mixing uniformity of the coal material itself, makes the coke quality more stable, and reduces the coal blending cost. Specifically, as Figure 1 As shown, the single-bin capacity of the hard coal silo is 5000m 3 ~20000m 3 The discharge port of the hard coal silo is connected to the feed port of the first-stage screening and crushing mechanism through a belt (i.e., the first belt 201). The number of hard coal silos is at least one, and the number can be set according to the type of hard coal that needs to be prepared. For the convenience of description, this embodiment is specifically set to two, namely the first hard coal silo 101 and the second hard coal silo 102. Through the setting of the first hard coal silo 101 and the second hard coal silo 102, different types of hard coal, such as common lean coal, lean coal, gas coal, etc., are first transported from different silos to the belt in proportion according to the coal blending ratio. The discharge port of the first-stage screening and crushing mechanism is then connected to the feed port of the coal blending bin through belts (i.e., the second belt 202 and the fourth belt 204). The first-stage screening and crushing mechanism is arranged to screen and then crush the hard coal, and after it reaches the specified particle size, it is sent into the coal blending bin and mixed evenly with other coking soft coal types (i.e., coking coal, fat coal, gas fat coal, part of 1 / 3 coking coal, etc.).

[0045] The coal blending bin includes a hard coal blending bin and a soft coal blending bin, and at least one of the hard coal blending bin and the soft coal blending bin is provided. In this embodiment, the hard coal blending bin includes a first hard coal blending bin 401 and a second hard coal blending bin 402, and the soft coal blending bin includes a first soft coal blending bin 403 and a second soft coal blending bin 404. The coal blending bin discharge port is connected to the feed port of the second-stage screening and crushing mechanism through a belt (i.e., the fifth belt 205), and the second-stage screening and crushing mechanism discharge port is connected to the feed port of the coal bin 6 through a belt (i.e., the sixth belt 206). In addition, it also includes a third belt 203, which is used to transport soft coal. The third belt 203 is provided between the first-stage screening and crushing mechanism and the coal blending bin, and the soft coal is transported to the fourth belt 204 for mixing, and finally transported to the soft coal blending bin.

[0046] Through the above arrangement, the pre-screened and crushed hard coal can be mixed with other coking soft coal types and then screened for the second time, and the coarse particles on the screen can be finally crushed and mixed evenly with the secondary screened materials after crushing as the feed coal for coking. This can effectively improve the quality of coking coal at a lower cost and with higher flexibility in coal blending, and the coke strength can be further improved.

[0047] As another implementation method of this embodiment, in order to ensure the two-stage screening and crushing effect of hard coal, the first-stage screening and crushing mechanism and the second-stage screening and crushing mechanism are further optimized and designed in this embodiment. Specifically:

[0048] First stage screening and crushing mechanism:

[0049] The first-stage screening and crushing mechanism includes a primary ultrafine screen 301 and a first crusher 501. The feed port of the primary ultrafine screen 301 is connected to the discharge port of the hard coal silo through a belt, the coarse particle discharge port of the primary ultrafine screen 301 is connected to the feed port of the first crusher 501 through a belt (i.e., the seventh belt 207), and the fine particle discharge port of the primary ultrafine screen 301 is connected to the feed port of the coal distribution bin through a belt.

[0050] Among them, it is more optimized that the primary ultra-fine screen 301 adopts any one of a cross screen and a roller screen. Compared with the traditional screen, the ultra-fine screen can not only dynamically adjust the aperture, dynamically adjust the fineness of the coal to be crushed, and transport it to the crusher. In terms of operation and maintenance, the workload of the pre-crusher is reduced, and the replacement cycle is virtually extended. Moreover, the ultra-fine cross screen can achieve self-cleaning of materials and dynamic screen holes during screening, which improves the screening effect of coal and reduces the operation and maintenance costs.

[0051] In addition, the aperture of the primary ultra-fine screen is set to 2-5mm. More optimally, for gas coal and 1 / 3 coking coal, the aperture of the primary ultra-fine screen can be set to 3-5mm, and for lean coal and lean lean coal, the aperture of the primary ultra-fine screen can be set to 2-4mm to obtain a finer fineness of lean coal and lean lean coal. Using the first-stage screening and crushing mechanism to screen and crush hard coal separately will reduce crushing energy consumption and production costs compared to full crushing.

[0052] At the same time, the various types of coal that have been selectively pre-crushed enter the coal blending bin. The hard coal types that have been pre-crushed in the coal blending bin will not be mixed unevenly, and there will be no segregation. The properties are more consistent. The hard coal types are pre-crushed and then mixed. After the initial crushing, the proportion of those larger than 3mm will be greatly reduced, up to 25%, which is relatively small compared with the existing soft coal types. After the final crushing, they can be fully mixed, and the proportion of those smaller than 3mm is also increased to 72%-80%. The thermal reactivity of coke is reduced by 1.5%, and the strength after reaction is increased by 2%. Finally, the coal is mixed according to the final coal blending ratio in the coal blending bin, transported to the lower belt, and transported to the final selective crushing process.

[0053] Second stage screening and crushing mechanism:

[0054] The second-stage screening and crushing mechanism includes a secondary ultra-fine screen 302 and a second crusher 502. The feed port of the secondary ultra-fine screen 302 is connected to the discharge port of the coal bunker through a belt, the coarse particle discharge port of the secondary ultra-fine screen 302 is connected to the feed port of the second crusher 502 through a belt (i.e., the seventh belt 207), and the fine particle discharge port of the secondary ultra-fine screen 302 is connected to the feed port of the coal bunker 6 through a belt. The secondary ultra-fine screen 302 also adopts any one of a cross screen and a roller screen.

[0055] The crushed hard coal and other types of coal are mixed together to form the final mixed coal, and the mixed coal is then placed above the secondary ultrafine screen for final screening. The coal particles on the screen enter the final crusher for crushing. The crushed coal particles are mixed with the coal particles under the screen on the belt behind the crusher. After being transferred more than twice by the subsequent belt, they are evenly mixed and sent to the coal tower as coal material for the coke oven. The final crushing ensures the crushing effect and the particle size control effect is better.

[0056] Because the proportion of hard coal in the second crushing is relatively small, most of it passes through the secondary ultra-fine screen as the undersize and directly enters the next conveyor belt, so the crushing work required for high-quality coking coal in the second crushing is relatively small. The aperture of the secondary ultra-fine screen 302 is set to 4-6 mm to ensure that some high-quality coking coal, such as coking coal and fat coal, can be used as furnace coal for coking without being crushed. When the coal blending system of the utility model is used for processing, the distribution machine will also be more uniform in the subsequent production of coke, effectively avoiding the large-particle coal from being put down first, and the high-fineness coal from being put down later or even accumulating on the edge of the silo, so that the quality of the coal finally entering the coke oven is more uniform and stable.

[0057] The coal blending system of the utility model can be applied not only to coal blending in all silos, but also to coal blending in some silos and some coal yards. It only needs to increase the coal blending silo, with less investment in the modification of the on-site equipment configuration and low operating cost. It can effectively improve the coal blending quality and reduce the coal blending cost, thereby improving the quality of coke. It is particularly suitable for the coal blending modification of adding a silo on the basis of the existing coal blending silo, and has a wide range of applications.

[0058] In addition, a material flow detection system (not shown in the figure) can be set on the ultra-fine screens of the first-stage screening and crushing mechanism and the second-stage screening and crushing mechanism to ensure the stability of the fineness of the coal entering the furnace and reduce fluctuations in the quality of the coal entering the furnace, which is conducive to the automation of the coal blending process and intelligent coal blending operations.

[0059] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope of the present invention as determined by the new claims.

Claims

1. A two-stage coal blending system based on grading, quality classification and crushing of coking coal, characterized by: It includes a hard coal silo, a two-stage screening and crushing mechanism, a coal blending bunker and a coal bunker (6); The discharge port of the hard coal silo is connected to the feed port of the first-stage screening and crushing mechanism through a belt, and the discharge port of the first-stage screening and crushing mechanism is connected to the feed port of the coal distribution bin through a belt; The coal distribution bin discharge port is connected to the feed port of the second-stage screening and crushing mechanism via a belt, and the second-stage screening and crushing mechanism discharge port is connected to the feed port of the coal bin (6) via a belt.

2. A two-stage coal blending system based on coking coal classification, quality classification and crushing according to claim 1, characterized in that: The invention also includes a third belt (203) for transporting soft coal. The third belt (203) is arranged between the first-stage screening and crushing mechanism and the coal blending bin to transport the soft coal to the soft coal blending bin.

3. The two-stage coal blending system based on coking coal classification, quality classification and crushing according to claim 1 is characterized in that: The first-stage screening and crushing mechanism comprises a primary ultrafine screen (301) and a first crusher (501); the feed port of the primary ultrafine screen (301) is connected to the discharge port of the hard coal silo via a belt; the coarse particle discharge port of the primary ultrafine screen (301) is connected to the feed port of the first crusher (501) via a belt; and the fine particle discharge port of the primary ultrafine screen (301) is connected to the feed port of the coal distribution silo via a belt.

4. A two-stage coal blending system based on coking coal classification, quality classification and crushing according to claim 3, characterized in that: The primary ultrafine screen (301) is a cross screen or a roller screen, and the aperture is set to 2-5 mm.

5. The two-stage coal blending system based on coking coal classification, quality classification and crushing according to claim 1 is characterized in that: The second-stage screening and crushing mechanism comprises a secondary ultrafine screen (302) and a second crusher (502); the feed port of the secondary ultrafine screen (302) is connected to the discharge port of the coal bunker via a belt; the coarse particle discharge port of the secondary ultrafine screen (302) is connected to the feed port of the second crusher (502) via a belt; and the fine particle discharge port of the secondary ultrafine screen (302) is connected to the feed port of the coal bunker (6) via a belt.

6. A two-stage coal blending system based on coking coal classification, quality classification and crushing according to claim 5, characterized in that: The secondary ultrafine screen (302) is a cross screen or a roller screen, and the aperture is set to 4-6 mm.

7. A two-stage coal blending system based on grading, quality classification and crushing of coking coal according to any one of claims 1 to 4, characterized in that: There is at least one hard coal silo.

8. A two-stage coal blending system based on grading, quality classification and crushing of coking coal according to any one of claims 1 to 4, characterized in that: The coal distribution bunker includes a hard coal distribution bunker and a soft coal distribution bunker, and at least one of the hard coal distribution bunker and the soft coal distribution bunker is provided.

9. The two-stage coal blending system based on coking coal classification, quality classification and crushing according to claim 2, characterized in that: The hard coal includes gas coal, lean coal, and poor lean coal; the soft coal includes coking coal, fat coal, and gas fat coal.

10. A two-stage coal blending system based on coking coal classification, quality classification and crushing according to any one of claims 1 to 4, characterized in that: The single-bin capacity of hard coal silo is 5000m 3 ~20,000m 3 .

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