A blending and washing system for medium coal and lump coal in a coal preparation plant

Abstract

The present invention discloses a blending and washing system for middlings and lump coal in a coal preparation plant. The middlings crusher is sequentially connected to a middlings bin, a middlings feeder, and a middlings belt. The lump coal crusher is sequentially connected to a lump coal bin, a lump coal feeder, and a lump coal belt. The discharge ends of the middlings belt and the lump coal belt are connected to a coal blending and mixing device, and the discharge end of the coal blending and mixing device is connected to a coal washing device. Moisture measuring instruments, ash content meters, and nuclear weighers are provided on both the middlings belt and the lump coal belt. The moisture measuring instruments, ash content meters, and nuclear weighers are all electrically connected to the signal input end of a feedback control device, and the middlings feeder and the lump coal feeder are all electrically connected to the signal output end of the feedback control device. The present invention mixes middlings and lump coal for washing according to a certain coal blending ratio, increases the coal washing amount on the basis of ensuring the quality of clean coal, and the structural form of the supporting chassis, combined with its ability to move and the changes in the pitch and radius of the stirring blades above, comprehensively realizes a dynamic real-time changing stirring effect that cannot be achieved by the relatively static effect of the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of coal washing, and in particular to a combined coal washing system for medium coal and lump coal in a coal preparation plant. Background Art

[0002] At present, the coal washing process in coal preparation plants adopts a combined process of heavy medium - flotation. The existing process only separately washes lump coal or medium coal. The following problems exist in this washing process: First, when washing lump coal alone, the load of some hand - sorting equipment in the coal preparation plant is too large, the processing capacity per unit time is low, the effective utilization rate of equipment is low, the overall labor efficiency is reduced, and the production cost is high; Second, when washing medium coal alone, the yield of washed clean coal is low, the yield of medium coal is high, which affects the comprehensive processing capacity. Summary of the Invention

[0003] Object of the Invention: In order to overcome the deficiencies in the prior art, the present invention provides a combined coal washing system for medium coal and lump coal in a coal preparation plant, which mixes medium coal and lump coal according to a certain coal blending ratio for combined coal washing. On the basis of ensuring the quality of clean coal, the coal washing volume is increased, and the structural form of the supporting chassis combined with its ability to move and the changes in the pitch and radius of the stirring blades above comprehensively achieve a dynamic real - time change stirring effect that cannot be achieved by the relatively static effect of the prior art.

[0004] Technical Solution: To achieve the above object, a combined coal washing system for medium coal and lump coal in a coal preparation plant of the present invention includes a medium coal crusher, a medium coal bin, a medium coal feeder, a medium coal belt, a lump coal hand - sorting system, a lump coal crusher, a lump coal bin, a lump coal feeder, a lump coal belt, a feedback control device, a coal blending device, and a coal washing device; the medium coal crusher is sequentially connected to the medium coal bin and the medium coal feeder, the feeding end of the medium coal belt is connected to the medium coal feeder, and the discharging end of the medium coal belt is connected to the coal blending device; the lump coal enters the lump coal crusher after passing through the lump coal hand - sorting system, the lump coal crusher is sequentially connected to the lump coal bin and the lump coal feeder, the feeding end of the lump coal belt is connected to the lump coal feeder, and the discharging end of the lump coal belt is connected to the coal blending device; the discharging end of the coal blending device is connected to the coal washing device; a medium coal moisture meter, a medium coal ash meter, and a medium coal nuclear weigher are arranged on the medium coal belt, and a lump coal moisture meter, a lump coal ash meter, and a lump coal nuclear weigher are arranged on the lump coal belt; the medium coal moisture meter, the medium coal ash meter, the medium coal nuclear weigher, the lump coal moisture meter, the lump coal ash meter, and the lump coal nuclear weigher are all electrically connected to the signal input end of the feedback control device, and the signal output end of the feedback control device is electrically connected to the medium coal feeder and the lump coal feeder.

[0005] Furthermore, the coal blending and mixing device includes an outer support frame, a feed cylinder, a mixing cylinder, and a distribution block; the feed cylinder is rotatably mounted above the outer support frame and is driven to rotate by a rotating motor; the interior of the feed cylinder is funnel-shaped, and the lower discharge port of the feed cylinder communicates with the upper feed port of the mixing cylinder. An electric stirring rod is arranged inside the mixing cylinder; the distribution block is located at the lower discharge port of the feed cylinder and is fixedly connected to the outer support frame; the upper end of the distribution block is conical, and the distribution block divides the lower discharge port of the feed cylinder into an annular shape; the discharge ends of the medium coal belt and the lump coal belt are correspondingly located directly above the funnel-shaped inner wall of the feed cylinder.

[0006] Furthermore, a number of helical outer convex ribs arranged at equal angles in the circumferential direction are provided on the funnel-shaped inner wall of the feed cylinder and the upper surface of the distribution block, and the spiral directions of the outer convex ribs of the two are opposite.

[0007] Furthermore, a spatial spiral-shaped stirring blade is arranged on the electric stirring rod.

[0008] Furthermore, the pitch of the stirring blade gradually decreases from top to bottom, and the radius of the stirring blade gradually increases from top to bottom.

[0009] Furthermore, the supporting chassis of the mixing cylinder is of a flat cylindrical structure, and the upper surface of the flat cylindrical structure is a non-horizontal plane, and at least a pair of mutually distant arc tangent ends form a maximum height difference in the vertical direction, and the supporting chassis is movably connected to the electric stirring rod through a movable connecting block.

[0010] Furthermore, the upper surface of the supporting chassis is in the shape of an elliptical surface formed after a straight line is obliquely cut.

[0011] Furthermore, the upper surface of the supporting chassis is a non-linear surface gradient surface.

[0012] Beneficial effects: The beneficial effects of a coal preparation plant's medium coal and lump coal combined washing system of the present invention are as follows:

[0013] 1) High degree of automation, timely, accurate, and comprehensive data collection. By adjusting the mixing ratio of washed lump coal and medium coal in a timely manner through data feedback, the quality of clean coal can be effectively guaranteed;

[0014] 2) Medium coal and lump coal are mixed and washed according to a certain coal blending ratio. According to different particle size distributions, the processing capacity of washed coal can be effectively increased, the washing efficiency can be improved, the processing capacity can be increased, and the coal washing cost can be reduced;

[0015] 3) The coal blending and mixing equipment is fed by a rotating feed drum above, and the discharge port of the feed drum is annular, which can play the role of mixing medium coal and lump coal; the electric stirring rod in the mixing drum below is equipped with a spatial spiral stirring blade, which has a good stirring effect, and the pitch of the stirring blade is larger at the top and smaller at the bottom, which is easy to stir the compressed coal blocks below, and the structural setting is more reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attachment Figure 1 This is a schematic diagram of the mixed coal and lump coal washing system of the present invention;

[0017] Attachment Figure 2 This is a structural diagram of a coal blending and mixing device;

[0018] Attachment Figure 3 It is a schematic cross-sectional view of the interior of the coal blending and mixing device;

[0019] Attachment Figure 4 Schematic diagram of the structure of the electric stirring rod. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] As attached Figures 1 to 4 The described medium coal and lump coal washing system of a coal preparation plant includes a medium coal crusher 1, a medium coal silo 2, a medium coal feeder 3, a medium coal belt 4, a lump coal manual selection system 5, a lump coal crusher 6, a lump coal silo 7, a lump coal feeder 8, a lump coal belt 9, a feedback control device 10, a coal blending and mixing device 11 and a coal washing device 12.

[0022] The medium coal pulverizer 1 is sequentially connected to the medium coal silo 2 and the medium coal feeder 3. The feed end of the medium coal belt 4 is connected to the medium coal feeder 3, and the discharge end of the medium coal belt 3 is connected to the coal blending and mixing device 11. The lump coal is transported to the lump coal crusher 6 through the lump coal hand-sorting system 5, and the lump coal greater than or equal to 55 mm is crushed to the following particle size. The lump coal crusher 6 is sequentially connected to the lump coal silo 7 and the lump coal feeder 8. The feed end of the lump coal belt 9 is connected to the lump coal feeder 8, and the discharge end of the lump coal belt 9 is connected to the coal blending and mixing device 11; the discharge end of the coal blending and mixing device 11 is connected to the coal washing device 12;

[0023] A middle coal belt 4 is provided with a middle coal moisture detector 13, a middle coal ash content detector 14 and a middle coal nuclear weigher 15, and a lump coal belt 9 is provided with a lump coal moisture detector 16, a lump coal ash content detector 17 and a lump coal nuclear weigher 18; the middle coal moisture detector 13, the middle coal ash content detector 14, the middle coal nuclear weigher 15, the lump coal moisture detector 16, the lump coal ash content detector 17 and the lump coal nuclear weigher 18 are all electrically connected to a signal input end of the feedback control device 10, and a signal output end of the feedback control device 10 is electrically connected to the middle coal feeder 3 and the lump coal feeder 8.

[0024] When the present invention is in operation, first, according to the float-sink test to obtain the washability curve data, the clean coal yield is calculated, and then according to the clean coal yield, and large-grained lump coal and fine-grained middle coal are mixed in different particle sizes for washing. The middle coal moisture detector 13, the middle coal ash content detector 14, the middle coal nuclear weigher 15, the lump coal moisture detector 16, the lump coal ash content detector 17 and the lump coal nuclear weigher 18 are used to detect the moisture, ash content and quality of the middle coal and the lump coal, and the detected data is transmitted into the feedback control device 10, and the feedback control device 10 then calculates the dry coal amount of each for mixed washing. The feedback control device 10 performs feedback control on the mixing ratios a and b of the crushed dry coal and the lump coal for washing by dynamically adjusting the feeding amounts of the middle coal feeder 3 and the lump coal feeder 8. Since the particle size distributions of the middle coal and the lump coal are different, the present invention can greatly increase the coal washing amount, improve the processing capacity of the coal preparation plant and increase the enterprise benefits.

[0025] As shown in the attached Figure 2 figure, the coal blending device 11 includes an outer support frame 19, a feed cylinder 20, a mixing cylinder 21 and a dividing block 22. As shown in the attached Figure 2 figure, the outer support frame 19 is fixedly installed on the working bottom surface, and the outer support frame 19 is composed of a circular rotating installation support and a plurality of support legs. The feed cylinder 20 is rotatably mounted above the outer support frame 19 and is driven to rotate by a rotating motor 26. The outside of the feed cylinder 20 is cylindrical and the inside is funnel-shaped. The lower discharge port of the feed cylinder 20 is communicated with the upper feed port of the mixing cylinder 21, and the upper feed port of the mixing cylinder 21 is in contact connection with the outer support frame 19. As shown in the attached Figure 3As shown, the mixing drum 21 is a vertical cylindrical shape, and an inclined discharge port is provided below the mixing drum 21. An electric mixing rod 23 is arranged inside the mixing drum 21, and the driving motor of the electric mixing rod 23 is arranged below the mixing drum 21. The upper end of the electric mixing rod 23 is rotationally matched with the lower end of the material distribution block 22. The material distribution block 22 is located at the discharge port at the lower end of the feeding cylinder 20 and is fixedly connected to the outer support frame 19. The upper end of the material distribution block 22 is conical, and the material distribution block 22 divides the discharge port at the lower end of the feeding cylinder 20 into a ring shape. The discharge ends of the medium coal belt 4 and the lump coal belt 9 are correspondingly located directly above the funnel-shaped inner wall of the feeding cylinder 20. The discharge ends of the medium coal belt 4 and the lump coal belt 9 are usually arranged on both sides of the feeding cylinder 20 respectively. The medium coal and the lump coal fall from the belt onto the funnel-shaped inner wall of the feeding cylinder 20. Since the feeding cylinder 20 is rotationally arranged and in cooperation with the material distribution block 22, the medium coal and the lump coal can enter the lower mixing drum 21 more evenly from the annular discharge port at the lower end of the feeding cylinder 20, and the medium coal and the lump coal are preliminarily mixed and stirred evenly.

[0026] A number of helical outer convex ribs 24 arranged at equal angles in the circumferential direction are provided on the funnel-shaped inner wall of the feeding cylinder 20 and the upper surface of the material distribution block 22, and the spiral directions of the outer convex ribs 24 of the two are opposite. The setting of the outer convex ribs 24 makes the funnel-shaped inner wall of the feeding cylinder 20 have a stronger ability to grasp and drive the lump coal and the medium coal, which is beneficial to driving the movement and mixing of the medium coal and the lump coal. The spiral directions of the outer convex ribs 24 on the feeding cylinder 20 and the material distribution block 22 are opposite, and they can cooperate with each other to better mix the medium coal and the lump coal evenly.

[0027] A space spiral-shaped mixing blade 25 is arranged on the electric mixing rod 23 to mix and stir the medium coal and the lump coal.

[0028] The pitch of the mixing blade 25 gradually decreases from top to bottom, and the radius of the mixing blade 25 gradually increases from top to bottom. Due to the gravity effect, coal blocks are easily pressed and piled up below the mixing drum 21. The structural setting of the mixing blade 25 makes the electric mixing rod 21 have a better stirring effect on the coal blocks inside the lower part of the mixing drum 21, and the overall structure is more reasonable. In order to make the stirring effect of the coal blocks better, the shape of the supporting chassis 27 is fully improved and can be rotated and moved if necessary. The supporting chassis 27 of the mixing drum 21 is a flat cylindrical structure, and the upper surface of the flat cylindrical structure is not a horizontal plane, and at least a pair of mutually distant arc tangent ends form the maximum height difference in the vertical direction, and the supporting chassis 27 is movably connected to the electric mixing rod 23 through a movable connecting block 28, and this movable connection can be opened in a movable and non-movable manner according to necessary circumstances.

[0029] The upper surface of the supporting chassis 27 is in the shape of an elliptical surface formed by straight-line chamfering. The upper surface of the supporting chassis 27 is a non-linear surface with gradual change. The structural forms of the supporting chassis 27 in the above two embodiments, combined with its ability to move and the changes in the pitch and radius of the upper stirring blades, comprehensively achieve a dynamic real-time change stirring effect that cannot be achieved by the relatively static effect of the prior art.

[0030] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A blending and washing system for middlings and lump coal in a coal preparation plant, characterized in that: It includes a medium coal pulverizer (1), a medium coal bin (2), a medium coal feeder (3), a medium coal belt (4), a lump coal handpicking system (5), a lump coal pulverizer (6), a lump coal bin (7), a lump coal feeder (8), a lump coal belt (9), a feedback control device (10), a coal blending and mixing device (11), and a coal washing device (12); The medium coal pulverizer (1) is sequentially connected to the medium coal bin (2) and the medium coal feeder (3). The feeding end of the medium coal belt (4) is connected to the medium coal feeder (3), and the discharging end of the medium coal belt (3) is connected to the coal blending and mixing device (11). After passing through the lump coal handpicking system (5), the lump coal enters the lump coal pulverizer (6). The lump coal pulverizer (6) is sequentially connected to the lump coal bin (7) and the lump coal feeder (8). The feeding end of the lump coal belt (9) is connected to the lump coal feeder (8), and the discharging end of the lump coal belt (9) is connected to the coal blending and mixing device (11). The discharging end of the coal blending and mixing device (11) is connected to the coal washing device (12); A medium coal moisture meter (13), a medium coal ash meter (14), and a medium coal nuclear weigher (15) are arranged on the medium coal belt (4). A lump coal moisture meter (16), a lump coal ash meter (17), and a lump coal nuclear weigher (18) are arranged on the lump coal belt (9). The medium coal moisture meter (13), the medium coal ash meter (14), the medium coal nuclear weigher (15), the lump coal moisture meter (16), the lump coal ash meter (17), and the lump coal nuclear weigher (18) are all electrically connected to the signal input end of the feedback control device (10). The signal output end of the feedback control device (10) is electrically connected to the medium coal feeder (3) and the lump coal feeder (8); The coal blending and mixing device (11) includes an outer support frame (19), a feeding cylinder (20), a stirring cylinder (21), and a dividing block (22). The feeding cylinder (20) is rotatably mounted above the outer support frame (19) and is driven to rotate by a rotating motor (26). The inside of the feeding cylinder (20) is funnel-shaped. The lower discharging port of the feeding cylinder (20) is communicated with the upper feeding port of the stirring cylinder (21). An electric stirring rod (23) is arranged in the stirring cylinder (21). The dividing block (22) is located at the lower discharging port of the feeding cylinder (20) and is fixedly connected to the outer support frame (19). The upper end of the dividing block (22) is conical, and the dividing block (22) divides the lower discharging port of the feeding cylinder (20) into a ring shape. The discharging ends of the medium coal belt (4) and the lump coal belt (9) are correspondingly located directly above the funnel-shaped inner wall of the feeding cylinder (20); The electric stirring rod (23) is provided with a spatial spiral stirring blade (25); The pitch of the stirring blade (25) gradually decreases from top to bottom, and the radius of the stirring blade (25) gradually increases from top to bottom; The supporting chassis (27) of the mixing drum (21) is of a flat cylindrical structure, and the upper surface of the flat cylindrical structure is a non-horizontal plane, and at least a pair of mutually distant arc tangent ends form a maximum height difference in the vertical direction. The supporting chassis (27) is movably connected to the electric mixing rod (23) through a movable connecting block (28); this movable connection can be switched between movable and non-movable according to necessary conditions; the structural form of the supporting chassis (27), combined with its ability to move and the changes in the pitch and radius of the mixing blades (25), can achieve dynamic real-time variable mixing.

2. The combined coal washing system for middlings and lump coal in a coal preparation plant according to claim 1, wherein: A plurality of helical convex ribs (24) arranged at equal circumferential angles are provided on the funnel-shaped inner wall of the feeding cylinder (20) and the upper surface of the material distribution block (22), and the helical directions of the convex ribs (24) of the two are opposite.

3. The coal blending and washing system for middlings and lump coal in a coal preparation plant according to claim 1, wherein: The upper surface of the supporting chassis (27) is in the shape of an elliptical surface formed after a straight-line oblique cut.

4. The coal washing system for the combined feeding of middlings and lump coal in a coal preparation plant according to claim 1, wherein: The upper surface of the supporting chassis (27) is a non-linear surface with a gradually changing surface.

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