Novel online uniform feeding buffer device for ultrahigh-pressure filter-pressing dry coal slime

Abstract

The utility model discloses a novel online uniform feeding buffer device for ultrahigh pressure filter pressing dry coal slime, which comprises a traveling mechanism, a feeding chute, a buffer tank and an ultrahigh pressure filter press, the feeding chute is positioned above the traveling mechanism, the buffer tank is positioned at the upper end of the feeding chute, the ultrahigh pressure filter press is positioned at the upper end of the buffer tank, and the buffer tank is positioned above the traveling mechanism. A walking frame is arranged on the walking mechanism, an impeller driving seat is positioned at the upper end of the walking frame, a crushing impeller is movably arranged on the impeller driving seat, and the crushing impeller is located in the feeding chute. The novel online uniform feeding buffer device for the ultrahigh-pressure filter-pressed dry coal slime can ensure that the coal slime is continuously and uniformly discharged, the granularity of a filter cake is greatly reduced, clean coal can be uniformly mixed, the quality of the clean coal is ensured, meanwhile, the phenomenon that the clean coal is blocked due to the overlarge granularity when entering a bin is avoided, the adaptability to different working conditions is high, and the service life of the clean coal is prolonged. Functions are highly integrated, the structure is compact, field installation condition adaptability is high, mechanical and electrical integration is achieved, and the automation degree is high.

Description

Technical Field

[0001] This utility model relates to the field of uniform and continuous feeding of filter press coal slime, and in particular to a novel online uniform feeding buffer device for ultra-high pressure filter press dry coal slime. Background Technology

[0002] The online uniform feeding buffer device for coal slime is a supporting equipment for the uniform and continuous feeding of coal slime for filter press. Coal slime generally refers to the semi-solid material formed by the moisture content of coal powder, and is one of the by-products generated in the current wet coal washing process. Currently, the mature coal slime dewatering processes include hot air drying systems, ordinary drum drying, and filter press. As a by-product of coal washing plants, coal slime has unfavorable characteristics such as high moisture content, high viscosity, high water holding capacity, high ash content, and low calorific value. The comprehensive utilization of coal slime has become a major challenge, and its value has not been fully realized. Drying technology generally cannot directly process concentrated slurry, is dependent on heat sources, and is greatly affected by environmental protection policies. Outdoor drying occupies a large area; the drying time is long; it is greatly affected by the season; it cannot be continuously produced; and it is prone to secondary dust and water pollution. High-temperature flue gas drying technology has poor safety performance and is difficult to obtain environmental impact assessment approval for hot air use, and has now been phased out by the market; low-temperature drying technology requires additional supporting equipment from thermal power plants, which is costly and easily subject to energy conservation and environmental protection policies. Currently, various ultra-high pressure filter presses have been developed in China, mainly using two technical routes: water pressing and mechanical pressing. These two types of filter presses can reduce the moisture content of coal slime by 6-10% compared to ordinary filter presses. After crushing, the coal slime is in a dry powder form, exhibiting excellent blending properties. Due to the reduced moisture content, the calorific value of ultra-high pressure coal slime is generally increased, allowing it to be blended into middlings, mixed coal, and other products for sale. However, because filter presses operate cyclically, the discharge is concentrated within a short period, resulting in a large instantaneous volume. This puts significant pressure on subsequent crushing and transfer processes. Therefore, solving the problem of uniform material discharge from filter presses is a core issue that the filter press industry needs to address. With continuous technological advancements, the manufacturing process requirements for online uniform feeding buffer devices for coal slime are also becoming increasingly stringent.

[0003] Existing online uniform feeding buffer devices for coal slime have certain drawbacks in use. Currently, many coal preparation plants use ultra-high pressure filter presses for coal slime, which have lower moisture content and better product quality. Coal slime can be used as a blended coal product or mixed with clean coal for sale. Coal slime products account for a high proportion of the products of coal preparation plants, and the sales of coal slime products directly affect the economic benefits of coal preparation plants.

[0004] During the filter press operation in a coal preparation plant, a single work cycle of the filter press can take 30-60 minutes. Taking the production data of a certain coal preparation plant as an example:

[0005] Mold closing and pressure holding for 3 minutes

[0006] Total feeding time: 13 minutes

[0007] Backdraft for 5 minutes

[0008] Press for 8 minutes

[0009] 5 minutes of backflow

[0010] Mold opening and unloading in 6 minutes

[0011] One cycle lasts 40 minutes, with a discharge time of 4-6 minutes. The discharge of coal slime from the filter press is discontinuous and involves a relatively large instantaneous volume, with the filter cake being pulsed into the collection belt piece by piece. Simultaneously, the coal slime has a certain viscosity, and coupled with the high-pressure pressing during the filtration process, the coal slime material discharged from the filter press is in the form of relatively compact, large cakes that are not easily broken naturally. This causes the following problems:

[0012] Due to the discontinuous discharge of filter press material, the impact on the discharge scraper is large, the filter cake is large, and material overflow occurs. Overload tripping accidents occur frequently, and the workshop environment is unsanitary.

[0013] Due to the uneven feeding of materials into the blended product, the instantaneous quantity is large, resulting in oversized particles. The moisture and calorific value are lower than those of the mixed coal product, which can easily cause periodic fluctuations in the quality of the final product. The particle size of the final product may exceed the standard or the quality of some parts of the product may be substandard, which can easily affect the sales of the final product.

[0014] Because the filter cake blocks are large and sticky, they cause blockages when mixed with coal and put into the silo.

[0015] The coal slime filter cake is discharged unevenly with a large instantaneous volume. When selecting subsequent coal slime transfer scraper conveyors and crushers, the instantaneous capacity must be based on 300t / h. Moreover, the transfer and crushing equipment only works during the unloading of coal slime filter cake within one hour, resulting in short effective working time, large equipment selection, high energy consumption, and uneconomical operation.

[0016] To avoid significant periodic fluctuations in the quality of the filter cake after discharge, the discharge speed was manually controlled to reduce the amount of coal slime cake mixed in. This extended the normal discharge time of the filter press from approximately 5 minutes to approximately 20 minutes, reducing the efficiency of the filter press and affecting its processing capacity.

[0017] In view of this, uneven discharge from the filter press and difficulty in breaking the filter cake seriously affect production and make it difficult to mix coal slime into clean coal, severely impacting economic benefits. Therefore, it is necessary to install a coal slime homogenization equipment system. We propose a new type of ultra-high pressure filter press dry coal slime online uniform feeding buffer device. Utility Model Content

[0018] To address the shortcomings of existing technologies, this utility model provides a novel online uniform feeding and buffering device for ultra-high pressure filtered coal slime. This device ensures continuous and uniform unloading of coal slime, significantly reduces filter cake particle size, allows for uniform mixing with clean coal to guarantee its quality, and prevents silo blockage due to excessively large particles. It exhibits strong adaptability to various working conditions, highly integrates functions, has a compact structure, strong adaptability to on-site installation conditions, and is electromechanically integrated with a high degree of automation. This effectively solves the problems mentioned in the background technology.

[0019] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a novel online uniform feeding and buffering device for ultra-high pressure filter press dry coal slime, comprising a walking mechanism, a feed chute, a buffer box, and an ultra-high pressure filter press. The feed chute is located above the walking mechanism, the buffer box is located at the upper end of the feed chute, and the ultra-high pressure filter press is located at the upper end of the buffer box. A walking frame is provided on the walking mechanism, and an impeller drive seat is positioned at the upper end of the walking frame. A crushing impeller is movably mounted on the impeller drive seat. The crushing impeller is located inside the feed chute. A conveyor is installed at the bottom of the walking mechanism, and an impeller maintenance space is provided at the end of the feed chute.

[0020] Preferably, a support base is installed at the bottom of the walking mechanism, a material feeding mechanism is installed on the side of the buffer box, a filter pressing mechanism is installed at the end of the ultra-high pressure filter press, a filter press power supply mechanism is installed at the top of the ultra-high pressure filter press, a filter press is installed between the ultra-high pressure filter press and the filter pressing mechanism, a buffer partition is installed inside the buffer box, and a positioning support is installed between the buffer box and the ultra-high pressure filter press.

[0021] Preferably, the side of the walking frame is provided with a walking wheel at the position where it contacts the walking mechanism, and a variable frequency motor is installed on the walking wheel to drive the walking wheel. A coal slurry collection belt is provided on the inner side of the walking mechanism.

[0022] Preferably, the bottom of the walking mechanism is fixed by a support base, the side of the buffer box is connected to the filter press mechanism through a material feeding mechanism, the filter press power supply mechanism supplies power to the ultra-high pressure filter press, and the interior of the buffer box is separated by a buffer partition.

[0023] Preferably, the traveling wheels drive the traveling frame to move horizontally on the traveling mechanism, and the traveling wheels are driven and controlled by a crushing impeller.

[0024] Preferably, the crushing impeller moves horizontally inside the feed chute and initially crushes the filter cake inside the feed chute, while feeding it evenly into the conveyor at the bottom.

[0025] Compared with existing technologies, this utility model provides a novel online uniform feeding and buffering device for ultra-high pressure filter-dried coal slime, which has the following beneficial effects: In this novel online uniform feeding and buffering device for ultra-high pressure filter-dried coal slime, the coal slime falling from the filter press falls into a modified chute, which serves as a buffer chamber. An impeller driven by a variable frequency motor in the middle of the chute pre-crushes the filter cake stored in the buffer chamber, while simultaneously feeding it evenly into the conveyor below. Below the impeller mounting bracket are two wheels driven by variable frequency motors, which travel along a track installed below to achieve continuous operation. The impeller speed and wheel travel speed are controlled by a frequency converter to pre-crush the coal slime filter cake, ensuring uniform particle size of the discharged material after pre-crushing. The unloading time of the novel uniform and continuous coal slime feeding device is automatically controlled by an intelligent control cabinet, ensuring synchronization with the filter press cycle time. This ensures that after the coal slime in the buffer chute of the previous cycle is evenly unloaded onto the scraper below, the coal slime of the next cycle can be unloaded into the empty buffer chute.

[0026] 1. After the installation of the new type of uniform and continuous coal slime feeding device, it can ensure the continuous and uniform unloading of coal slime, significantly reduce the particle size of filter cake, and uniformly mix in clean coal to ensure the quality of clean coal. At the same time, the clean coal entering the bin will not cause blockage due to excessively large particles.

[0027] 2. The coal slime homogenization system can intelligently adjust the cutting of coal slime, preventing chute blockage and material accumulation. The unloading time of the homogenization unloading device is consistent with the working cycle time of the filter press, and the unloading time can be intelligently adjusted according to the site conditions.

[0028] 3. The filter press can achieve normal unloading without the need for manual adjustment of the unloading speed due to uneven unloading, which can greatly improve the efficiency of the filter press system and increase the hourly coal slime processing capacity of the filter press.

[0029] 4. It has strong adaptability to different working conditions, highly integrated functions, compact structure, strong adaptability to on-site installation conditions, electromechanical integration, high degree of automation, and the entire online uniform feeding buffer device for coal slime has a simple structure, is easy to operate, and has better performance than traditional methods. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of a novel ultra-high pressure filter dry coal slime online uniform feeding buffer device according to this utility model.

[0031] Figure 2 This is a side view of the structural schematic diagram of a novel ultra-high pressure filter dry coal slime online uniform feeding buffer device according to this utility model.

[0032] Figure 3 This is a schematic diagram of the walking mechanism in a novel ultra-high pressure filter dry coal slime online uniform feeding buffer device of this utility model.

[0033] Figure 4 This is a schematic diagram of the crushing impeller in a novel ultra-high pressure filter dry coal slime online uniform feeding buffer device according to this utility model.

[0034] Figure 5 This is a schematic diagram of the structure of the walking mechanism and the feed chute assembly in a novel ultra-high pressure filtered coal slime online uniform feeding buffer device of this utility model.

[0035] Figure 6 This is a schematic diagram of the feed chute in a novel ultra-high pressure filter dry coal slime online uniform feeding buffer device according to this utility model.

[0036] Figure 7 This is a schematic diagram of the structure of the traveling frame in the traveling mechanism of a novel ultra-high pressure filter dry coal slime online uniform feeding buffer device of this utility model.

[0037] In the diagram: 1. Walking mechanism; 2. Feed chute; 3. Support base; 4. Walking frame; 5. Conveyor; 6. Impeller drive base; 7. Crushing impeller; 8. Feeding mechanism; 9. Filter press mechanism; 10. Filter press; 11. Filter press power supply mechanism; 12. Ultra-high pressure filter press; 13. Buffer box; 14. Impeller maintenance space; 15. Positioning support; 16. Buffer baffle; 17. Variable frequency motor; 18. Walking wheels; 19. Coal slime collection belt. Detailed Implementation

[0038] The technical solution of this utility model will now be clearly and completely described in conjunction with the accompanying drawings and specific embodiments.

[0039] like Figure 1-7 As shown, a novel online uniform feeding and buffering device for ultra-high pressure filter press dry coal slime includes a traveling mechanism 1, a feed chute 2, a buffer box 13, and an ultra-high pressure filter press 12. The feed chute 2 is located above the traveling mechanism 1, the buffer box 13 is located at the upper end of the feed chute 2, and the ultra-high pressure filter press 12 is located at the upper end of the buffer box 13. A traveling frame 4 is installed on the traveling mechanism 1, and an impeller drive seat 6 is positioned at the upper end of the traveling frame 4. A crushing impeller 7 is movably installed on the impeller drive seat 6 and is located inside the feed chute 2. A conveyor 5 is installed at the bottom of the traveling mechanism 1, and an impeller maintenance space 14 is provided at the end of the feed chute 2. This device can ensure continuous and uniform unloading of coal slime, significantly reduce the particle size of the filter cake, and uniformly mix in clean coal to ensure the quality of clean coal. At the same time, the clean coal entering the bin will not cause blockage due to excessively large particles. It has strong adaptability to different working conditions, highly integrated functions, compact structure, strong adaptability to on-site installation conditions, and is electromechanical integrated with a high degree of automation.

[0040] The bottom of the walking mechanism 1 is equipped with a support base 3, the side of the buffer box 13 is equipped with a material feeding mechanism 8, the end of the ultra-high pressure filter press 12 is equipped with a filter pressing mechanism 9, the upper end of the ultra-high pressure filter press 12 is equipped with a filter press power supply mechanism 11, a filter press 10 is installed between the ultra-high pressure filter press 12 and the filter pressing mechanism 9, a buffer partition 16 is installed inside the buffer box 13, and a positioning support 15 is installed between the buffer box 13 and the ultra-high pressure filter press 12.

[0041] The walking frame 4 has a walking wheel 18 at the position where it contacts the walking mechanism 1. A variable frequency motor 17 is installed on the walking wheel 18 to drive the walking wheel 18. A coal slime collection belt 19 is provided on the inner side of the walking mechanism 1.

[0042] The bottom of the walking mechanism 1 is fixed by the support base 3, the side of the buffer box 13 is connected to the filter press mechanism 9 through the material feeding mechanism 8, the filter press power supply mechanism 11 supplies power to the ultra-high pressure filter press 12, and the interior of the buffer box 13 is separated by the buffer partition 16.

[0043] The traveling wheel 18 drives the traveling frame 4 to move horizontally on the traveling mechanism 1, and the traveling wheel 18 is driven and controlled by the crushing impeller 7.

[0044] The crushing impeller 7 moves horizontally inside the feed chute 2 and initially crushes the filter cake inside the feed chute 2, while feeding it evenly into the conveyor 5 at the bottom.

[0045] Working Principle: This utility model includes a walking mechanism 1, a feed chute 2, a support base 3, a walking frame 4, a conveyor 5, an impeller drive base 6, a crushing impeller 7, a material feeding mechanism 8, a filter press mechanism 9, a filter press 10, a filter press power supply mechanism 11, an ultra-high pressure filter press 12, a buffer tank 13, an impeller maintenance space 14, a positioning support 15, a buffer partition 16, a variable frequency motor 17, walking wheels 18, and a coal slime collection belt 19. The coal slime falling from the filter press falls into the modified chute, which serves as a buffer tank. The impeller, driven by a variable frequency motor, initially crushes the filter cake stored in the buffer tank and simultaneously feeds it evenly into the conveyor below. Below the impeller support are two wheels driven by variable frequency motors, which travel along the track below to achieve continuous operation. The speed of the impeller and the speed of the wheels are controlled by a frequency converter to pre-crush the coal slime filter cake, ensuring uniform particle size of the discharged filter cake after pre-crushing. The unloading time of the new type of uniform and continuous coal slime feeding device is automatically controlled by the intelligent control cabinet, which can ensure synchronization with the cycle time of the filter press. This ensures that after the coal slime in the buffer chute of the previous cycle is uniformly unloaded onto the scraper below, the coal slime in the next cycle can be unloaded into the empty buffer chute.

[0046] The novel coal slime uniform and continuous feeding device adds a buffer system between the filter press chute and the unloading scraper conveyor. The chute below the filter press maintains a height of over 1500mm as a coal slime buffer, and then a coal slime homogenization device is installed below the chute. The intelligent filter press coal slime homogenizer occupies approximately 750mm of the existing lower section of the coal slime chute. Tracks are added to both sides of the lower scraper conveyor, allowing the intelligent filter press coal slime homogenizer to move automatically on the tracks. It cuts the coal slime in the buffer chute using a guide wheel and then evenly unloads it onto the lower scraper conveyor, thus achieving uniform unloading. The equipment is easy to install and has minimal impact on on-site production. The above describes the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A novel online uniform feeding and buffering device for ultra-high pressure filter press dry coal slime, comprising a traveling mechanism (1), a feed chute (2), a buffer box (13), and an ultra-high pressure filter press (12), characterized in that: The feed chute (2) is located above the walking mechanism (1), the buffer box (13) is located at the upper end of the feed chute (2), the ultra-high pressure filter press (12) is located at the upper end of the buffer box (13), the walking mechanism (1) is provided with a walking frame (4), the upper end of the walking frame (4) is positioned with an impeller drive seat (6), the impeller drive seat (6) is movably provided with a crushing impeller (7), the crushing impeller (7) is located inside the feed chute (2), the bottom of the walking mechanism (1) is equipped with a conveyor (5), and the end of the feed chute (2) is provided with an impeller maintenance space (14).

2. The novel ultra-high pressure filter-dry coal slime online uniform feeding buffer device according to claim 1, characterized in that: The bottom of the walking mechanism (1) is equipped with a support base (3), the side of the buffer box (13) is equipped with a feeding mechanism (8), the end of the ultra-high pressure filter press (12) is equipped with a filter pressing mechanism (9), the upper end of the ultra-high pressure filter press (12) is equipped with a filter press power supply mechanism (11), a filter press (10) is installed between the ultra-high pressure filter press (12) and the filter pressing mechanism (9), a buffer partition (16) is installed inside the buffer box (13), and a positioning support (15) is installed between the buffer box (13) and the ultra-high pressure filter press (12).

3. The novel ultra-high pressure filter-dry coal slime online uniform feeding buffer device according to claim 1, characterized in that: The walking frame (4) has a walking wheel (18) at the position where it contacts the walking mechanism (1). A variable frequency motor (17) is installed on the walking wheel (18) to drive the walking wheel (18). A coal slime collection belt (19) is provided on the inner side of the walking mechanism (1).

4. The novel ultra-high pressure filter-dry coal slime online uniform feeding buffer device according to claim 2, characterized in that: The bottom of the walking mechanism (1) is fixed by the support seat (3), the side of the buffer box (13) is connected to the filter press mechanism (9) through the material feeding mechanism (8), the filter press power supply mechanism (11) supplies power to the ultra-high pressure filter press (12), and the interior of the buffer box (13) is separated by the buffer partition (16).

5. A novel online uniform feeding and buffering device for ultra-high pressure filtered dry coal slime according to claim 3, characterized in that: The walking wheel (18) drives the walking frame (4) to move horizontally on the walking mechanism (1), and the walking wheel (18) is driven and controlled by the crushing impeller (7).

6. The novel ultra-high pressure filter-dry coal slime online uniform feeding buffer device according to claim 1, characterized in that: The crushing impeller (7) moves horizontally inside the feed chute (2) and initially crushes the filter cake inside the feed chute (2) through the crushing impeller (7), while feeding it evenly into the conveyor (5) at the bottom.

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