A low-dust-emission coal feeding device

Abstract

A low-dust-emission coal feeding device, belonging to the field of industrial dust removal technology, comprises a double-layer conveying cylinder, an air curtain bladder, an annular jet belt, and a cyclone separator. The inner layer of the double-layer conveying cylinder is a coal conveying chamber, and the outer layer is a pressurized air curtain chamber. The air curtain bladders in the pressurized air curtain chamber are spaced apart along the conveying direction. Multiple sets of annular jet belts contain multiple sets of jet units evenly distributed along the circumference. The jet units of adjacent annular jet belts are offset 15° circumferentially, which can spray high-speed airflow to form a spiral air curtain. The cyclone separator includes a venturi tube and a separation box. The venturi tube is located downstream of the double-layer conveying cylinder and its throat is connected to a water supply pipe. The air outlet of the separation box is connected to the air inlet of the air curtain bladder through a pipe with a dust filter, and the water outlet is connected to a sedimentation tank. This device can reduce coal dust emissions during the coal feeding process, reduce energy waste and environmental pollution.

Description

Technical Field

[0001] This invention relates to the field of industrial dust removal technology, specifically to a coal feeding device with low dust emissions. Background Technology

[0002] In industrial production, coal feeding devices, as key equipment for coal transportation and supply, are widely used in production processes in industries such as thermal power generation, metallurgy, and chemicals. Their operational efficiency and environmental performance directly affect the stability and environmental friendliness of the entire production system. However, existing coal feeding devices generally suffer from high dust emissions during actual operation, which not only poses a serious threat to the health of operators but also causes energy waste and environmental pollution. Summary of the Invention

[0003] In view of the above situation and to overcome the defects of the prior art, the present invention provides a coal feeding device with low dust emission, which at least partially solves the problems mentioned in the background art.

[0004] The technical solution adopted in this invention is as follows: A coal feeding device with low dust emissions, comprising: The double-layer conveying cylinder has an inner coal conveying chamber and an outer pressurized air curtain chamber. Air curtain airbags are installed inside the pressurized air curtain cavity and spaced apart along the conveying direction; The annular jet strip includes multiple sets of jet units evenly distributed around the circumference of the conveying cavity. The circumferential positions of the jet units of adjacent annular jet strips are offset by 15° in sequence, so that the ejected airflow forms a spiral air curtain. The cyclone separator includes a venturi tube and a separator box. The venturi tube is located downstream of the double-layer conveying cylinder and its throat is connected to a water supply pipe. The air outlet of the separator box is connected to the air inlet of the air curtain airbag through a pipe, and a dust filter is provided on the pipe. The water outlet of the separator box is connected to a sedimentation tank.

[0005] In a further embodiment, the jet nozzle of the jet unit is arranged in a fan shape, with a fan-shaped diffusion angle of 90°-120°.

[0006] Furthermore, the upstream end of the double-layer conveying cylinder is the coal inlet end, which is provided with a coal inlet, and the downstream end is the coal outlet end, which is provided with a coal outlet; the bottom of the double-layer conveying cylinder is provided with a steel support, and the bottom of the support is provided with an anti-slip rubber pad.

[0007] In a further embodiment, the jet unit of the annular jet belt near the coal inlet end of the double-layer conveyor cylinder is offset vertically from the conveying chamber by 0°, and the jet units of the adjacent annular jet belt are offset sequentially by 15° toward the end of the coal conveying chamber.

[0008] Furthermore, the double-layer conveying cylinder is provided with multiple sets of quick-opening inspection windows on both sides, and the edges of the windows are inlaid with sealing strips.

[0009] In a further implementation, the quick-opening inspection window includes a window frame, a glass observation panel, and a quick-locking mechanism. The glass observation panel is made of high-temperature resistant tempered glass with a thickness of not less than 5 mm.

[0010] Furthermore, the coal conveying chamber is equipped with a conveyor belt with an automatic correction unit and a cleaning scraper unit.

[0011] In a further embodiment, a flow regulating valve is provided between the throat of the venturi tube and the water supply pipe. The flow regulating valve is electrically connected to a dust concentration sensor in the separation box and can automatically adjust the water inlet volume according to the dust concentration.

[0012] The beneficial effects achieved by the present invention using the above structure are as follows: Through the structural design of the double-layer conveying cylinder, the air curtain bladder in the outer pressurized air curtain cavity and multiple sets of annular jet belts work together to form a spiral air curtain by shifting adjacent jet units circumferentially by 15°, which can efficiently constrain the dust generated during coal conveying and reduce its escape. In the downstream cyclone separator, the venturi tube combined with water flow achieves dust capture. The gas separated in the separator box is purified by the dust filter and then circulated back to the air curtain bladder, which improves the dust collection efficiency and realizes gas recycling, reducing energy consumption. It has the advantages of low dust emission and energy-saving utilization. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the low-dust-emission coal feeding device proposed in an embodiment of the present invention; Figure 2 This is a front view of the low-dust-emission coal feeding device proposed in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the double-layer conveying cylinder proposed in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the air curtain airbag proposed in an embodiment of the present invention; Figure 5 for Figure 1 Enlarged view of point A in the middle.

[0014] The components include: 1. Double-layer conveying cylinder; 2. Coal conveying chamber; 3. Pressurized air curtain chamber; 4. Air curtain airbag; 5. Annular jet belt; 6. Jet unit; 7. Cyclone separator; 8. Venturi tube; 9. Separation box; 10. Coal inlet; 11. Coal outlet; 12. Support; 13. Anti-slip rubber pad; 14. Quick-opening inspection window; 15. Window frame; 16. Glass observation panel; 17. Quick-locking mechanism; 18. Conveyor belt; and 19. Flow regulating valve.

[0015] The accompanying drawings are provided to further understand the embodiments and form part of the specification. They are used together with the embodiments for explanation and do not constitute a limitation on the embodiments. Detailed Implementation

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection.

[0017] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments.

[0018] In industrial production, coal feeding devices, as key equipment for coal transportation and supply, are widely used in production processes in industries such as thermal power generation, metallurgy, and chemicals. Their operational efficiency and environmental performance directly affect the stability and environmental friendliness of the entire production system. However, existing coal feeding devices generally suffer from high dust emissions during actual operation, which not only poses a serious threat to the health of operators but also causes energy waste and environmental pollution.

[0019] Recognizing the above problems, this application proposes and discloses a low-dust-emission coal feeding device, which can reduce coal dust emissions during the coal feeding process, thereby reducing energy waste and environmental pollution.

[0020] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this disclosure provides a low-dust-emission coal feeding device, comprising: The double-layer conveying cylinder 1 has an inner coal conveying chamber 2 and an outer pressurized air curtain chamber 3. Air curtain airbags 4 are located inside the pressurized air curtain cavity 3 and are spaced apart along the conveying direction; The annular jet belt 5 includes multiple sets of jet units 6 evenly distributed around the circumference of the conveying cavity. The circumferential positions of the jet units 6 of adjacent annular jet belts 5 are offset by 15° in sequence, so that the ejected high-speed airflow forms a spiral air curtain. The cyclone separator 7 includes a venturi tube 8 and a separator 9. The venturi tube 8 is located downstream of the double-layer conveying cylinder 1, and its throat is connected to a water supply pipe. The air outlet of the separator 9 is connected to the air inlet of the air curtain airbag 4 through a pipe, and a dust filter is provided on the pipe. The water outlet of the separator 9 is connected to a sedimentation tank.

[0021] In this embodiment, through the structural design of the double-layer conveying cylinder 1, the air curtain airbag 4 in the outer pressurized air curtain cavity 3 and multiple sets of annular jet belts 5 work together, and the adjacent jet units 6 are offset by 15° in the circumference to form a spiral air curtain, which can efficiently constrain the dust generated by coal conveying and reduce its escape; in the downstream cyclone separator 7, the venturi tube 8 combined with water flow realizes dust capture, and the gas separated by the separator 9 is purified by the dust filter and then circulated to the air curtain airbag 4, which improves the dust collection efficiency and realizes gas recycling, reduces energy consumption, and takes into account both low dust emissions and energy-saving utilization.

[0022] In this embodiment, multiple sets of jet units 6 are evenly distributed along the circumference to form a closed air curtain base. With the circumferential offset of 515° between adjacent annular jet belts, a continuous spiral air curtain can be constructed in the conveying chamber. This not only completely wraps the coal conveying path to constrain dust diffusion, but also uses the axial propulsion force of the spiral airflow to directionally push the dust to the separation device, improving dust collection efficiency. At the same time, the spiral air curtain can reduce the interference of airflow on coal conveying and ensure conveying stability.

[0023] The principle is that the 615° circumferential offset of adjacent jet units causes the velocity of the latter airflow to be superimposed in the tangential direction on the trajectory of the former airflow, forming a composite airflow with spiral motion along the axial direction. This spiral airflow forms an annular sealing pressure in the radial direction to prevent dust from penetrating, and forms a propulsive force in the axial direction to drive the dust to move towards the coal outlet end, thus forming a dual synergistic effect of sealing and pushing to achieve efficient control of dust.

[0024] like Figure 3 and Figure 4 As shown, the jet nozzle of the jet unit 6 is arranged in a fan shape, and its fan-shaped diffusion angle is 90°-120°.

[0025] In this embodiment, the fan-shaped diffusion angle of 90°-120° ensures that the airflow from adjacent jet units 6 forms a seamless coverage of the conveying cavity cross-section, while also preventing excessively rapid attenuation of the airflow edge velocity due to an excessively large angle, thus ensuring the constraint strength of the air curtain on the dust. The fan-shaped airflow, in conjunction with the 15° circumferential offset of the jet unit 6, can form a continuous spiral flow field in the axial direction, both constraining the dust and propelling it towards the separation device, thereby improving dust collection efficiency.

[0026] like Figure 1 and Figure 2As shown, the upstream end of the double-layer conveying cylinder 1 is the coal inlet end, which is provided with a coal inlet 10, and the downstream end is the coal outlet end, which is provided with a coal outlet 11; the bottom of the double-layer conveying cylinder 1 is provided with a steel support 12, and the bottom of the support 12 is provided with an anti-slip rubber pad 13.

[0027] In this embodiment, the steel bracket 12 provides stable support for the entire device, which can reduce vibration during equipment operation and prevent components from loosening or seal failure due to vibration.

[0028] In this embodiment, the jet unit 6 of the annular jet belt 5 near the coal inlet end of the double-layer conveying cylinder 1 is offset vertically from the conveying cavity by 0°, and the jet unit 6 of the adjacent annular jet belt 5 is offset sequentially by 15° toward the end of the coal conveying cavity 2.

[0029] Specifically, the jet units 6 of the first annular jet belt 5 are all offset from the conveying cavity by zero degrees; the jet units 6 of the second annular jet belt 5 are offset towards the end of the conveying cavity by 15°, the jet units 6 of the third annular jet belt 5 by 30°, the jet units 6 of the fourth annular jet belt 5 by 45°, and the jet units 6 of the fifth annular jet belt 5 by 60°. As the axial movement progresses, the offset gradually increases, causing the airflow to form a continuous spiral twisting trend in the axial direction.

[0030] In this embodiment, the circumferential offset of the jet unit 6 in the annular jet belt 5 increases sequentially from the coal inlet end to the coal outlet end, forming a continuous and stable spiral air curtain in the coal conveying chamber 2. This spiral air curtain can completely envelop the coal conveying path, constraining dust diffusion at the source. Simultaneously, the spiral propulsion force directs the dust towards the cyclone separator 7 at the coal outlet end, improving dust collection efficiency. Furthermore, the gradient offset design ensures comprehensive air curtain coverage, accommodating dust control needs at different conveying locations, effectively reducing dust escape, and significantly minimizing pollution to the working environment.

[0031] like Figure 1 and Figure 2 As shown, the double-layer conveying cylinder 1 is provided with multiple sets of quick-opening inspection windows 14 on both sides, and the edges of the windows are inlaid with sealing strips.

[0032] In this embodiment, multiple quick-opening inspection windows 14 on both sides of the double-layer conveying cylinder 1, together with sealing strips on the edge of the windows, not only facilitate operators to quickly open and inspect and maintain core components such as the annular jet belt 5 and coal conveying device inside the device, reducing the difficulty and time cost of maintenance, but also ensure the airtightness of the inspection windows when closed through the sealing strips, preventing airflow leakage in the pressurized air curtain cavity 3 and the entry of external dust, ensuring the stable formation of the spiral air curtain and the dust containment effect.

[0033] like Figure 1 and Figure 5As shown, the quick-opening inspection window 14 includes a window frame 15, a glass observation plate 16, and a quick-locking mechanism 17. The glass observation plate 16 is made of high-temperature resistant tempered glass with a thickness of not less than 5mm.

[0034] In this embodiment, the quick-locking mechanism 17 enables rapid opening and closing, facilitating timely inspection and maintenance of the device's interior by operators and significantly shortening maintenance time. The high-temperature tempered glass observation panel 16 can withstand the high-temperature environment inside the conveying chamber and allows for direct observation of the internal operating status, enabling operators to monitor the equipment's condition without frequent opening and closing. At the same time, the sealing strip ensures airtightness when closed, preventing air curtain leakage or external dust intrusion.

[0035] like Figure 1 and Figure 2 As shown, the coal conveying chamber 2 is equipped with a conveyor belt 18 with an automatic correction unit and a cleaning scraper unit.

[0036] In this embodiment, the conveyor belt 18 can adjust its position in real time through the automatic correction unit to avoid increased local friction and excessive dust generation caused by deviation during coal transportation. At the same time, it can prevent blockage caused by the conveyor belt 18 running off-track and ensure the continuity of transportation. The cleaning scraper unit can promptly remove coal debris remaining on the surface of the conveyor belt 18 and the inner wall of the conveying cavity, reducing secondary dust generated by the accumulation and friction of residual materials. This reduces dust generation at the source of transportation and, together with the air curtain constraint and separation device, further improves the overall low dust emission effect.

[0037] like Figure 1 and Figure 2 As shown, a flow regulating valve 19 is provided between the throat of the venturi tube 8 and the water supply pipe. The flow regulating valve 19 is electrically connected to the dust concentration sensor in the separation box 9 and can automatically adjust the water inlet volume according to the dust concentration.

[0038] It should be noted that, in this document, relational terms such as “first” and “second” are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0039] Although embodiments have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit, the scope of which is defined by the appended claims and their equivalents.

[0040] The embodiments have been described above, and such description is not restrictive. The figures shown are only one embodiment, and the actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit, such design should fall within the scope of protection.

Claims

1. A coal feeding device with low dust emissions, characterized in that, include: The double-layer conveying cylinder (1) has an inner coal conveying chamber (2) and an outer pressurized air curtain chamber (3). Multiple air curtain airbags (4) are disposed in the pressurized air curtain cavity (3) and spaced apart along the conveying direction; The annular jet belt (5) includes multiple sets of jet units (6) evenly distributed around the circumference of the conveying cavity. The circumferential positions of the jet units (6) of adjacent annular jet belts (5) are offset by 15° in sequence, so that the ejected airflow forms a spiral air curtain. Cyclone separator (7) includes a venturi tube (8) and a separator (9). The venturi tube (8) is located downstream of the double-layer conveying cylinder (1), and its throat is connected to a water supply pipe. The air outlet of the separator (9) is connected to the air inlet of the air curtain airbag (4) through a pipe, and a dust filter is provided on the pipe. The water outlet of the separator (9) is connected to a sedimentation tank.

2. The low-dust-emission coal feeding device according to claim 1, characterized in that, The jet nozzle of the jet unit (6) is arranged in a fan shape, and its fan-shaped diffusion angle is 90°-120°.

3. The low-dust-emission coal feeding device according to claim 1, characterized in that, The upper end of the double-layer conveying cylinder (1) is the coal inlet end, which is provided with a coal inlet (10), and the lower end is the coal outlet end, which is provided with a coal outlet (11); the bottom of the double-layer conveying cylinder (1) is provided with a steel bracket (12), and the bottom of the bracket (12) is provided with an anti-slip rubber pad (13).

4. The low-dust-emission coal feeding device according to claim 3, characterized in that, The jet unit (6) of the annular jet belt (5) near the coal inlet end of the double-layer conveying cylinder (1) is offset vertically from the conveying chamber by 0°, and the jet unit (6) of the adjacent annular jet belt (5) is offset by 15° toward the end of the coal conveying chamber (2).

5. The low-dust-emission coal feeding device according to claim 1, characterized in that, The double-layer conveying cylinder (1) is provided with multiple quick-opening inspection windows (14) on both sides, and the edges of the windows are inlaid with sealing strips.

6. The low-dust-emission coal feeding device according to claim 5, characterized in that, The quick-opening inspection window (14) includes a window frame (15), a glass observation plate (16) and a quick-locking mechanism (17). The glass observation plate (16) is made of high-temperature resistant tempered glass with a thickness of not less than 5 mm.

7. The low-dust-emission coal feeding device according to claim 1, characterized in that, The coal conveying chamber (2) is equipped with a conveyor belt (18) with an automatic correction unit and a cleaning scraper unit.

8. The low-dust-emission coal feeding device according to claim 1, characterized in that, A flow regulating valve (19) is provided between the throat of the venturi tube (8) and the water supply pipe. The flow regulating valve (19) is electrically connected to the dust concentration sensor in the separation box (9) and can automatically adjust the water intake according to the dust concentration.

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