A small experimental coke oven for coal blending test

Abstract

The utility model relates to the technical field of coal blending test, disclose a kind of experimental small coke oven of coal blending test, including mixing barrel, the inside of mixing barrel is provided with mixing mechanism, the right side of mixing barrel is provided with crushing cylinder, the inside of crushing cylinder is provided with crushing mechanism, the left side of mixing barrel is provided with feeding mechanism, the mixing mechanism includes shaft bar one, the top of shaft bar one is placed in the inside of mixing barrel, the outside top of shaft bar one is fixedly connected with stirring fan blade, the outside of shaft bar one is fixedly connected with stirring cage, the bottom of shaft bar one is fixedly connected with bearing block. In the utility model, shaft bar one drives stirring fan blade to rotate, fully stirs upper coal material, middle stirring cage screw pushes material, avoids stratification, bottom capstan rotates with bearing block, scrapes mixing barrel bottom, eliminates accumulation dead angle, reduces the experimental error caused by uneven mixing, reduces industrial production trial and error cost.

Description

Technical Field

[0001] This utility model relates to the field of coal blending and testing technology, and in particular to a small experimental coke oven for coal blending and testing. Background Technology

[0002] Coal blending analysis is a process that uses experimental methods to analyze the coal quality characteristics after different coal types are blended in proportion, providing a basis for optimizing coking coal blending schemes. It involves mixing multiple single coal types in proportion, evaluating coking properties, thermal stability, and coking performance, and determining the optimal coal blending ratio through analysis. This process reduces costs while ensuring coke quality and is an important step in guiding scientific coal blending in coking production.

[0003] In the steel industry, experimental small coke ovens for coal blending testing can simulate the coking process of industrial coke ovens. They can quickly verify different coal blending schemes with lower costs and less raw materials, providing data support for optimizing the coal blending structure. They can accurately analyze the coke yield and thermal strength indicators of single coal or coal blends, thereby rationally selecting coking coal, reducing production costs, and improving the economic benefits of enterprises.

[0004] Existing experimental small coke ovens used for coal blending testing struggle to achieve uniform mixing of coal samples during the mixing stage, resulting in uneven coal quality in certain areas and dead zones at the bottom of the oven. This leads to uneven heating and insufficient coking of some coal materials, affecting the accuracy of coke quality testing. Consequently, experimental results deviate from those of actual large coke ovens, making it difficult to accurately reflect the true coking effect of the coal blending scheme. This misleads the optimization of coal blending ratios and increases the trial-and-error costs in industrial production. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a small experimental coke oven for coal blending and testing. It aims to improve the existing technology, which has difficulties in achieving uniform mixing of coal samples during the mixing stage, resulting in uneven coal quality in some areas, dead corners at the bottom of the furnace, uneven heating of some coal materials, insufficient coking, misleading the optimization of coal blending ratio, and increasing the trial and error costs of industrial production.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a small experimental coke oven for coal blending and testing, comprising a mixing cylinder, wherein a mixing mechanism is provided inside the mixing cylinder, a crushing cylinder is provided on the right side of the mixing cylinder, a crushing mechanism is provided inside the crushing cylinder, and a feeding mechanism is provided on the left side of the mixing cylinder. The mixing mechanism includes a rotating shaft, the top of which is located inside the mixing cylinder. A stirring fan blade is fixedly connected to the top outer side of the rotating shaft, and a stirring cage is fixedly connected to the outer side of the rotating shaft. A bearing block is fixedly connected to the bottom end of the rotating shaft, and a bottom winch is fixedly connected to the outer side of the bearing block. A mixing outlet is fixedly connected to the bottom of the mixing cylinder.

[0007] As a further description of the above technical solution: The crushing mechanism includes a second rotating shaft, the top of which is located inside the crushing cylinder. A grinding disc is fixedly connected to the top outer side of the second rotating shaft. A material dropping groove is provided on the bottom inner side of the grinding disc. Grinding balls are provided inside the grinding disc. An air pump is provided at the top of the crushing cylinder. An extrusion assembly is provided in the middle outer side of the second rotating shaft. A dispersion assembly is provided at the bottom of the second rotating shaft. A screening assembly is provided at the bottom of the crushing cylinder.

[0008] As a further description of the above technical solution: The extrusion assembly includes multiple support rods, which are fixedly connected to each other on the outer middle of the second rotating shaft. The opposite sides of the multiple support rods are fixedly connected to the same grooved extrusion disc, and the lower part of the second rotating shaft is fixedly connected to the lower extrusion disc.

[0009] As a further description of the above technical solution: The dispersing component includes a mounting block, the top of which is fixedly connected to the bottom end of the rotating shaft, and a material distribution rack is fixedly connected to the outside of the mounting block.

[0010] As a further description of the above technical solution: The screening assembly includes a discharge funnel, the top of which is fixedly connected to the bottom of the crushing cylinder, and a screen is fixedly connected to the top inner side of the discharge funnel.

[0011] As a further description of the above technical solution: The feeding mechanism includes a ton bag box, the right side of which is located on the left side of the mixing cylinder. A discharge port is provided on the top right side of the ton bag box, and a pneumatic motor is fixedly connected to the left side of the ton bag box.

[0012] As a further description of the above technical solution: A vacuum pipe is connected between the adjacent feeding mechanism and the mixing cylinder, and a meter is fixedly connected to the top of the outer side of the vacuum pipe.

[0013] As a further description of the above technical solution: An exhaust chimney is provided on the top right side of the mixing cylinder, and a vacuum pipe is connected between the adjacent mixing cylinder and the crushing cylinder.

[0014] This utility model has the following beneficial effects: 1. In this utility model, the rotating shaft drives the stirring fan blades to rotate, which fully stirs the upper coal material. The middle stirring cage spiral pushes the material to avoid stratification. The bottom winch rotates with the bearing block to scrape the bottom of the mixing cylinder, eliminating dead corners of accumulation. The mixing outlet accurately discharges homogeneous coal material, ensuring the uniformity of coal sample mixing, reducing local component deviations, providing representative samples for subsequent small coke oven experiments, improving the accuracy of coal blending analysis, reducing experimental errors caused by uneven mixing, and reducing trial and error costs in industrial production.

[0015] 2. In this utility model, the coal material is ground by the cooperation of the top grinding disc and grinding balls through rotational friction. The material is guided to fall by the dropping chute. The middle extrusion component further crushes and breaks down the material, improving the fineness. The bottom dispersion component breaks up the clumps. The material screening component screens the qualified particle size, improving the crushing efficiency and fineness, ensuring that the coal sample has a uniform particle size, providing high-quality raw materials for subsequent coal blending and small coke oven experiments, and reducing experimental deviations caused by substandard crushing. Attached Figure Description

[0016] Figure 1 A three-dimensional view of a small experimental coke oven for coal blending and testing proposed in this utility model; Figure 2 This is a front view of a small experimental coke oven for coal blending and testing proposed in this utility model. Figure 3 This is a structural breakdown diagram of the mixing mechanism in a small experimental coke oven for coal blending and testing proposed in this utility model. Figure 4 This is a structural breakdown diagram of the pulverizing mechanism in a small experimental coke oven for coal blending and testing, as proposed in this utility model. Figure 5 This is a schematic diagram of the feeding mechanism in a small experimental coke oven for coal blending and testing, as proposed in this utility model.

[0017] Legend: 1. Mixing cylinder; 2. Crushing cylinder; 3. Mixing mechanism; 301. Rotating shaft one; 302. Stirring cage; 303. Bearing block; 304. Mixing discharge nozzle; 305. Stirring fan blade; 306. Bottom winch; 4. Crushing mechanism; 401. Rotating shaft two; 402. Material drop chute; 403. Grinding ball; 404. Grinding disc; 405. Extrusion assembly; 4051. Grooved extrusion disc; 4052. Support rod; 4053. Lower extrusion disc; 406. Dispersion assembly; 4061. Mounting block; 4062. Material distribution frame; 407. Screening assembly; 4071. Discharge funnel; 4072. Screen; 408. Air pump; 5. Feeding mechanism; 501. Ton bag box; 502. Air compressor; 503. Discharge port; 6. Meter; 7. Exhaust chimney; 8. Vacuum pipe one; 9. Vacuum pipe two. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Reference Figure 1 , Figure 2 and Figure 3 An embodiment of this utility model is provided: a small experimental coke oven for coal blending and testing, including a mixing cylinder 1, a mixing mechanism 3 is provided inside the mixing cylinder 1, a crushing cylinder 2 is provided on the right side of the mixing cylinder 1, a crushing mechanism 4 is provided inside the crushing cylinder 2, and a feeding mechanism 5 is provided on the left side of the mixing cylinder 1 for feeding. The mixing mechanism 3 includes a rotating shaft 301. The top of the rotating shaft 301 is located inside the mixing cylinder 1. A stirring fan blade 305 is fixedly connected to the top of the outer side of the rotating shaft 301. A stirring cage 302 is fixedly connected to the outer side of the rotating shaft 301. A bearing block 303 is fixedly connected to the bottom of the rotating shaft 301. A bottom winch 306 is fixedly connected to the outer side of the bearing block 303. A mixing outlet 304 is fixedly connected to the bottom of the mixing cylinder 1. The rotating shaft 301 drives the stirring fan blade 305 to rotate, which fully mixes the upper coal material. The stirring cage 302 in the middle spiral pushes the material to avoid stratification. The bottom winch 306 rotates with the bearing block 303 to scrape the bottom of the mixing cylinder 1 to eliminate dead corners of accumulation. The mixing outlet 304 accurately discharges homogeneous coal material to ensure the uniformity of coal sample mixing. Specifically, the mixing mechanism 3 adopts a multi-stage collaborative stirring design to ensure that the coal sample is three-dimensionally mixed in the mixing cylinder 1. When the rotating motor drives the rotating shaft 301 to rotate, the top stirring fan blade 305 radially disperses the upper coal material at a moderate speed, breaking up coal particle agglomeration under shear force. The rotating motor and the feeding channel are installed separately. The pitch of the middle stirring cage 302 decreases from top to bottom, forming a progressive material compression zone, so that the coal flow is continuously squeezed and relaxed during axial conveying, strengthening the inter-particle permeation and mixing. The outer edge of the bottom winch 306 maintains a small gap with the bottom surface of the mixing cylinder 1. When the scraper rotates, it generates an upward thrust, which rolls the deposited material back into the stirring zone, eliminating the dead corner at the bottom of the mixing cylinder 1. The 304 mixing nozzle adopts a gradually narrowing flow channel design, which makes the coal flow form a swirling flow at the outlet, further homogenizing the material and controlling the ash content deviation and volatile matter deviation of different coal types within a very small range, thus improving the mixing uniformity. It is not only suitable for conventional bituminous coal blending, but also has a significant effect on the blending of high volatile gas coal or low caking lean coal, effectively solving the problem of uneven mixing in micro-coal blending experiments in experimental small coke ovens.

[0020] Reference Figure 1 , Figure 2 and Figure 4 The crushing mechanism 4 includes a second rotating shaft 401, the top of which is located inside the crushing cylinder 2. A grinding disc 404 is fixedly connected to the top of the outer side of the second rotating shaft 401. A material dropping groove 402 is provided at the bottom of the inner side of the grinding disc 404. Grinding balls 403 are provided inside the grinding disc 404. An air pump 408 is provided at the top of the crushing cylinder 2. An extrusion component 405 is provided in the middle of the outer side of the second rotating shaft 401. A dispersion component 406 is provided at the bottom of the second rotating shaft 401. A screening component 407 is provided at the bottom of the crushing cylinder 2. The coal is ground by the rotation friction of the top grinding disc 404 and the grinding balls 403. The material dropping groove 402 guides the material to fall. The middle extrusion component 405 further extrudes and crushes the material, improving the fineness. The bottom dispersion component 406 breaks up clumps. The material screening component 407 screens qualified particles, improving crushing efficiency and fineness. Specifically, the crushing mechanism 4 adopts a multi-stage composite crushing design, which achieves efficient fine crushing of coal samples through the synergistic effect of mechanical force and airflow. When the rotating shaft rod 401 rotates at high speed under the drive of the rotating motor, the rotating motor and the feeding channel are staggered and will not affect each other. The top grinding disc 404 drives the internal grinding balls 403 to make irregular movements at a specific speed. Under the action of centrifugal force, the coal material is subjected to impact, crushing and grinding. After the coal material falls into the grinding disc 404 from the feed port, it is first coarsely ground to the initial particle size, and then falls in an orderly manner through the spiral-shaped material drop groove 402 at the bottom of the inner side. When coal particles enter the extrusion zone, the radial extrusion force generated by the rotation of the middle extrusion component 405 causes the coal particles to fracture brittlely as they pass through the gap. The bottom dispersion component 406 forms a powerful vortex when rotating at high speed, which disperses the agglomerated coal powder. The screening component 407 allows coal powder of qualified particle size to fall through the screen 4072 into the discharge port 503, while particles that do not meet the standard are bounced back to the crushing zone for further processing. The negative pressure airflow generated by the air pump 408 runs through the feed channel, allowing the mixed material to enter the crushing cylinder 2 in an orderly manner. The mechanism can stably output coal powder of the target particle size when processing different types of coal, effectively improving the accuracy and repeatability of subsequent coal blending experiments.

[0021] Reference Figure 4The extrusion assembly 405 includes multiple support rods 4052, which are fixedly connected to the middle of the outer side of the rotating shaft rod 401. The opposite sides of the multiple support rods 4052 are fixedly connected to the same grooved extrusion disc 4051. The lower part of the rotating shaft rod 401 is fixedly connected to the lower part for secondary crushing. The dispersion assembly 406 includes a mounting block 4061, the top of which is fixedly connected to the bottom of the rotating shaft rod 401. The outer side of the mounting block 4061 is fixedly connected to a material distribution frame 4062. The screening assembly 407 includes a discharge funnel 4071, the top of which is fixedly connected to the bottom of the crushing cylinder 2. The inner top of the discharge funnel 4071 is fixedly connected to a screen 4072. Specifically, the extrusion assembly 405 adopts a double-layer nested structure to enhance the crushing effect. Multiple support rods 4052 are evenly distributed along the circumference, and the grooved extrusion disc 4051 is firmly connected to the outside of the rotating shaft rod 401 to form a rotating extrusion unit. The bottom surface of the grooved extrusion disc 4051 is provided with a guide groove, and the groove depth decreases from the outside to the inside. When the coal particles enter the groove, they move towards the edge along the spiral path under the action of centrifugal force. During this period, they are subjected to double extrusion by the groove wall and the lower extrusion disc 4053. The lower extrusion disc 4053 and the grooved extrusion disc 4051 form an extrusion, and shear crushing force is generated when rotating, causing the coal particles to undergo brittle fracture when passing through the gap, thus achieving secondary crushing. The dispersing component 406 achieves efficient dispersion of coal powder through the material distribution frame 4062. The material distribution frame 4062 on the outside of the mounting block 4061 is spiral-shaped. When the rotating shaft rod 401 drives the material distribution frame 4062 to rotate at high speed, the centrifugal force generated throws the agglomerated coal powder toward the screen 4072, and the vortex airflow generated at the same time makes the fine powder fully diffused. The discharge hopper 4071 of the screening assembly 407 adopts an inverted conical design with a smooth inner wall and a Teflon coating to prevent coal powder from sticking. The screen 4072 is made of woven stainless steel wire, which allows qualified coal powder to slide quickly to the discharge port 503, forming a closed loop in the entire crushing process and significantly improving the efficiency and particle size uniformity of coal powder preparation.

[0022] Reference Figure 1 , Figure 2 and Figure 5The feeding mechanism 5 includes a ton bag box 501. The right side of the ton bag box 501 is located on the left side of the mixing cylinder 1. The top right side of the ton bag box 501 is provided with a discharge port 503. The left side of the ton bag box 501 is fixedly connected to a pneumatic pump 502. A vacuum pipe 8 is connected between the adjacent parts of the feeding mechanism 5 and the mixing cylinder 1. The pneumatic pump 502 forms a negative pressure in the vacuum pipe 8 for feeding. A metering device 6 is fixedly connected to the top outside of the vacuum pipe 8. An exhaust chimney 7 is provided on the top right side of the mixing cylinder 1. A vacuum pipe 9 is connected between the adjacent parts of the mixing cylinder 1 and the crushing cylinder 2. One end of the vacuum pipe 9 is connected to the bottom of the mixing discharge nozzle 304, and the other end is connected to the top of the crushing cylinder 2. The negative pressure airflow generated by the air pump 408 passes through the vacuum pipe 9. Specifically, the feeding mechanism 5 adopts a negative pressure pneumatic conveying design to achieve precise quantitative conveying of coal samples. The ton bag box 501 can stably carry the coal sample. When the pneumatic motor 502 starts, a negative pressure environment is formed in the vacuum pipeline 8. Under the action of gravity and airflow, the coal sample enters the vacuum pipeline 8 through the discharge port 503. Meter 6 uses real-time monitoring of coal mass flow rate. The inner wall of the pipeline is coated with a ceramic coating to reduce coal particle adhesion. When the cumulative feed amount reaches the set value, the control system automatically shuts down the gas turbine 502 and stops feeding. The exhaust chimney 7 at the top of the mixing cylinder 1 is filled with an activated carbon filter element. When the airflow generated during mixing rises, the dust is adsorbed and intercepted in sequence, thus purifying the air. Vacuum pipe 29 is made of seamless stainless steel pipe. The elbows are designed with a large radius of curvature to reduce conveying resistance. The negative pressure generated by air pump 408 ensures that the mixed coal sample is stably conveyed to crushing cylinder 2. A quick-release interface is set in the middle of the pipe for easy regular cleaning. The fully enclosed negative pressure conveying system avoids coal powder leakage and realizes continuous automated operation of feeding, mixing and crushing, improving the efficiency and safety of coal blending experiments.

[0023] Working principle: First, the feeding mechanism 5 is started. The coal sample in the ton bag box 501 is sucked in by the negative pressure environment formed by the vacuum pipe 8 under the action of the pneumatic motor 502. The metering device 6 monitors the coal flow in real time. After the set amount is reached, the control system shuts off the pneumatic motor 502 to stop feeding. During this period, the exhaust chimney 7 at the top of the mixing cylinder 1 adsorbs and intercepts dust to purify the air. After the coal sample enters the mixing cylinder 1, the rotating shaft 301 of the mixing mechanism 3 rotates, the top stirring fan 305 radially disperses the upper coal material and breaks up agglomerates, the middle stirring cage 302 forms a compression zone due to the decreasing screw pitch, so that the coal flow is squeezed and relaxed in the axial conveying to strengthen the mixing, the bottom winch 306 rotates with the bearing block 303, and scrapes the bottom of the cylinder with a small gap to roll the deposited material into the mixing zone to eliminate dead corners. After the mixed coal material is further homogenized by the swirling of the mixing outlet 304, it is conveyed to the crushing cylinder 2 through the vacuum pipe 9 under the negative pressure of the air pump 408. After entering the crushing cylinder 2, the rotating shaft 401 of the crushing mechanism 4 drives the top grinding disc 404 to rotate. The internal grinding balls 403 impact, crush, and grind the coal material under centrifugal force. The coarsely ground coal material falls into the middle extrusion assembly 405 through the dropping chute 402. The grooved extrusion disc 4051 rotates with the rotating shaft, and the double extrusion and shearing with the lower extrusion disc 4053 causes the coal material to undergo brittle fracture, achieving secondary crushing. Subsequently, the coal material falls into the bottom dispersion assembly 406. The spiral material distribution frame 4062 on the outside of the mounting block 4061 rotates at high speed. The centrifugal force and vortex airflow generated break up the agglomerated coal powder and throw it onto the screen 4072 of the screening assembly 407. The qualified coal powder slides out through the inverted conical discharge funnel 4071. Through continuous automated operation of feeding, mixing, and crushing, the coal sample is ensured to be mixed evenly and crushed to meet the standards, providing high-quality raw materials for coal blending and testing, and effectively improving the accuracy and efficiency of the experiment.

[0024] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A laboratory small coke oven for coal blending test, comprising a mixing drum (1), characterized in that: The mixing cylinder (1) is equipped with a mixing mechanism (3), a crushing cylinder (2) is provided on the right side of the mixing cylinder (1), a crushing mechanism (4) is provided inside the crushing cylinder (2), and a feeding mechanism (5) is provided on the left side of the mixing cylinder (1). The mixing mechanism (3) includes a rotating shaft (301), the top of which is located inside the mixing cylinder (1). A stirring fan (305) is fixedly connected to the top of the outer side of the rotating shaft (301). A stirring cage (302) is fixedly connected to the outer side of the rotating shaft (301). A bearing block (303) is fixedly connected to the bottom end of the rotating shaft (301). A bottom winch (306) is fixedly connected to the outer side of the bearing block (303). A mixing outlet (304) is fixedly connected to the bottom of the mixing cylinder (1).

2. The experimental small coke oven for coal blending analysis according to claim 1, characterized in that: The crushing mechanism (4) includes a second rotating shaft (401), the top of which is located inside the crushing cylinder (2). A grinding disc (404) is fixedly connected to the top of the outer side of the second rotating shaft (401). A material dropping groove (402) is provided at the bottom of the inner side of the grinding disc (404). Grinding balls (403) are provided inside the grinding disc (404). An air pump (408) is provided at the top of the crushing cylinder (2). An extrusion assembly (405) is provided at the middle of the outer side of the second rotating shaft (401). A dispersion assembly (406) is provided at the bottom of the second rotating shaft (401). A screening assembly (407) is provided at the bottom of the crushing cylinder (2).

3. The experimental small coke oven for coal blending and testing according to claim 2, characterized in that: The extrusion assembly (405) includes multiple support rods (4052), which are fixedly connected to the middle of the outer side of the second rotating shaft (401) and the same grooved extrusion disc (4051) is fixedly connected to the opposite side of the multiple support rods (4052). The lower extrusion disc (4053) is fixedly connected to the lower middle part of the second rotating shaft (401).

4. The experimental small coke oven for coal blending analysis according to claim 2, characterized in that: The dispersing component (406) includes a mounting block (4061), the top of which is fixedly connected to the bottom end of the rotating shaft rod (401), and a material distribution rack (4062) is fixedly connected to the outside of the mounting block (4061).

5. The experimental small coke oven for coal blending and testing according to claim 2, characterized in that: The screening assembly (407) includes a discharge funnel (4071), the top of which is fixedly connected to the bottom of the crushing cylinder (2), and a screen (4072) is fixedly connected to the top of the inner side of the discharge funnel (4071).

6. The experimental small coke oven for coal blending analysis according to claim 1, characterized in that: The feeding mechanism (5) includes a ton bag box (501), the right side of which is located on the left side of the mixing cylinder (1), the top right side of which is provided with a discharge port (503), and the left side of which is fixedly connected with a pneumatic motor (502).

7. The experimental small coke oven for coal blending analysis according to claim 1, characterized in that: The feeding mechanism (5) and the mixing cylinder (1) are connected by a vacuum pipe (8), and a meter (6) is fixedly connected to the top of the outer side of the vacuum pipe (8).

8. The experimental small coke oven for coal blending analysis according to claim 1, characterized in that: An exhaust chimney (7) is provided on the top right side of the mixing cylinder (1), and a vacuum pipe (9) connects the adjacent mixing cylinder (1) and the crushing cylinder (2).

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