Coal blockage-proof feeding pipe apparatus for coal storage eurosilo

Abstract

A coal blockage-proof feeding pipe apparatus for a coal storage Eurosilo includes a central telescopic feeding pipe, a coal blockage-proof feeding pipe, and a feeding pipe mounting base connected. A middle part of a first section of round pipes of the central telescopic feeding pipe is of a conical pipe structure with a smaller upper part and a larger lower part; the first section of round pipes is connected to an upper end of the coal blockage-proof feeding pipe; a dust return plate is arranged inside the coal blockage-proof feeding pipe to guide dust-laden gas, generated at a coal falling point below and ascending along a pipe wall, downward, preventing the dust-laden gas from ascending along a cylinder wall into gaps among round pipe walls of the central 10 telescopic feeding pipe. The coal blockage-proof feeding pipe has an exhaust port to discharge the internal dust-laden gas to the outside.

Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims the priority benefit of China application serial no. 202410980976.3, filed on Jul. 22, 2024. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.BACKGROUNDTechnical Field

[0002] The present invention relates to the technical field of devices for thermal power plants, and particularly relates to a coal blockage-proof feeding pipe apparatus for coal storage Eurosilo.Description of Related Art

[0003] Eurosilo coal storage is a latest environmentally friendly method for coal storage. Currently, domestic thermal power enterprises have introduced an Eurosilo technology for the coal storage. However, some issues have arisen during the use of the Eurosilo coal storage, which directly affect a safe and stable operation of an Eurosilo.

[0004] Numerous devices are arranged inside the Eurosilo. These devices are primarily used for stacking and storing coal from low to high levels within the Eurosilo, extracting coal in the Eurosilo from high to low levels, and outputting coal from the Eurosilo.

[0005] As shown in FIG. 1, the existing coal storage Eurosilo mainly consists of components such as an Eurosilo cylindrical silo wall 1, an Eurosilo feeding inlet 2, an Eurosilo top trestle 3, a rotary trestle 4, a rotary trestle traveling apparatus 5, a central telescopic feeding pipe 6, a spiral frame lifting wire rope 7, a spiral frame 8, a screw conveyor 9, a guide chute 10, a spiral frame type-A frame 11, a central winch platform 12, a central rotary platform 13, and a spiral frame central platform 14. An upper port of the central telescopic feeding pipe 6 connects to the Eurosilo feeding inlet 2, while its lower port connects to the guide chute 10 on the spiral frame central platform 14. As a feeding channel of the Eurosilo, the central telescopic feeding pipe 6 extends and retracts with ascending and descending of the spiral frame central platform 14. Coal enters the guide chute 10 through the central telescopic feeding pipe 6 and is dropped into the Eurosilo via a coal outlet 16 to accumulate inside.

[0006] As shown in FIG. 2, the central telescopic feeding pipe 6 is composed of several concentric sections of round pipes of different diameters. Taking five sections of round pipes as an example, the central telescopic feeding pipe 6 consists of a first section of round pipes 6-1, a foundation flange of first section of round pipes 6-1-1, guide rod holes 6-1-2, buffer fixing bolt holes 6-1-3, reinforcing ribs 6-1-4, limit stop rings 6-1-5, second section of round pipes 6-2, third section of round pipes 6-3, fourth section of round pipes 6-4, and fifth section of round pipes 6-5.

[0007] As shown in FIG. 3 to FIG. 5, the central telescopic feeding pipe 6 is connected to the guide chute 10. A connection structure mainly consists of the foundation flange of first section of round pipes 6-1-1, a guide chute 10, a spiral frame central platform 14, a coal dropping outlet 16, a grating plate 16-1, a feeding pipe mounting base 17, a mounting interface 17-1, a fixed support frame 17-2, rubber buffers 18, guide rods 19, and buffer fixing bolt holes 17-1. The foundation flange of the first section of round pipes 6-1-1 of the first section of round pipes 6-1 of the central telescopic feeding pipe 6 is connected to the mounting interface 17-1 on the feeding pipe mounting base 17 through the rubber buffers 18. The rubber buffers 18 provides cushioning, while the guide rods 19 ensure a proper amount of movement between the first section of round pipes 6-1 of the central telescopic feeding pipe 6 and the feeding pipe mounting base 17 to reduce impact forces. It also ensures axial movement along the guide rods 19 without causing deflection.

[0008] A discharging outlet at a lower end of the central telescopic feeding pipe 6 is directly aligned with the coal dropping outlet 16, the grating plate 16-1, and the dropping area plane (coal accumulation zone) 14-1 on the spiral frame central platform 14. This plane is also an area where coal accumulates during a feeding process of the Eurosilo. The accumulated coal cannot be discharged automatically, leading to an increasing accumulation that may even reach the lower port of the central telescopic feeding pipe. Consequently, the coal may affect the normal telescopic motion of the telescopic feeding pipe.

[0009] It can thus be seen that the device arranged inside the Eurosilo mainly consists of the rotary trestle, a hoisting and lifting apparatus, a trestle traveling mechanism, a central rotary platform, a central telescopic feeding pipe, a spiral frame, and a spiral stacking and reclaiming apparatus. The top of the Eurosilo is equipped with a coal conveying trestle, which contains a belt conveyor. Coal is transported by the conveyor to the inlet of the central telescopic falling pipe at the upper part of the Eurosilo. It then enters the interior of the Eurosilo through the upper port of the central telescopic falling pipe installed on the central rotary platform. The coal reaches the spiral frame at the lower outlet of the central telescopic falling pipe. The spiral frame is equipped with an apparatus for stacking and reclaiming coal within the Eurosilo, namely the screw conveyor. The screw conveyor may rotate in both forward and reverse directions, thereby achieving the stacking and reclaiming of coal within the Eurosilo.

[0010] When the screw conveyor rotates forward, it pushes the coal emerging from the bottom of the central telescopic feeding pipe along the radius of the Eurosilo cylindrical body to a circumferential direction until the coal reaches the Eurosilo wall. The spiral frame and the rotary trestle simultaneously perform horizontal rotational movement around the central axis of the Eurosilo, allowing the screw conveyor to uniformly stack the incoming coal inside the Eurosilo. When reclaiming coal from the Eurosilo, the screw conveyor rotates in an opposite direction to that during stacking, converging the coal on a surface of a coal pile toward the circle center, which is then discharged through an activated feeder.

[0011] During the stacking of coal into the Eurosilo, the spiral frame always maintains a fixed distance (30 cm to 50 cm) from an upper surface of the coal within the Eurosilo. During coal reclaiming, the screw conveyor must be in contact with the upper surface of the coal pile within the Eurosilo.

[0012] When coal is fed into the Eurosilo from outside, it passes through the central telescopic feeding pipe. An upper end of the central telescopic feeding pipe is connected to the coal feeding pipe outlet on the central platform, and the lower end thereof is connected to a coal receiving point on the spiral frame. Therefore, the coal entering the Eurosilo must pass through the central telescopic feeding pipe. During coal stacking, the length of the central telescopic feeding pipe continues to shorten with the lifting of the spiral frame. When coal is taken out of the Eurosilo, the length of the central telescopic feeding pipe continues to extend with the descent of the spiral frame. The function of the central telescopic feeding pipe is to prevent the coal entering the

[0013] Eurosilo from dispersing and spilling during a falling process, so that the falling coal always lands on the coal receiving point of the spiral frame, preventing the coal from directly impacting the coal pile. At the same time, it reduces coal dust and ensures the safety of coal stacking in the Eurosilo.

[0014] Since the central telescopic feeding pipe is composed of several concentric sections of round pipes with different diameters, each section of the round pipes having the same length. From the top down, the diameters of the round pipes increase sequentially from the first section to the last. This design allows each upper section to be inserted into the adjacent lower section, and this insertion is repeated sequentially so that all round pipes can eventually be inserted into the last one, forming a so-called transport state. Each section of the round pipes is equipped with stepped sections of different diameters at both ends as sliding limit connectors, which allow adjacent sections to slide against each other while remaining hooked and connected without separation, and also enable relative sliding along the central axis of the round pipe body. This structure enables several sections of the feeding pipes to be connected along a central axis, unfolding or contracting section by section as a distance between the two ends extends or retracts. This structural feature allows a distance between the feeding inlet and a discharging outlet of the central telescopic feeding pipe to change with a distance between the rotary trestle and the spiral frame, ensuring that materials always pass through the telescopic feeding pipe. When the spiral frame is at its highest position, the central telescopic feeding pipe is retracted to its shortest length. Since the central feeding pipe is in a vertical state, each section of the round pipes is stacked on the lower one under action of gravity. When the spiral frame descends, starting from a topmost first section of round pipes, each section is sequentially pulled out one by one until a penultimate section of round pipes is fully pulled out. At this point, the spiral frame has reached a lowest part of the Eurosilo, and all coal in the Eurosilo has been emptied. When coal is fed into the Eurosilo for stacking, the spiral frame gradually rises, and the fully extended central telescopic feeding pipe begins to retract. During retraction, the penultimate section of round pipes from the bottom is inserted into the last section of round pipes. When fully inserted, the penultimate section of round pipes remains in a stationary state relative to the last section of round pipes. As the spiral frame continues to ascend, the third-to-last section of round pipes starts to insert into the penultimate section of round pipes. In this way, as the spiral frame rises higher, the central telescopic feeding pipe retracts into a lower section of round pipes. When the spiral frame reaches the highest point, the entire central telescopic feeding pipe is retracted into the lowermost section of round pipes. The extension and retraction of the central telescopic feeding pipe always remain consistent with upward and downward movements of the spiral frame.

[0015] In practical applications, lignite is currently a main type of coal used for power generation in China. It has a high proportion of powdery particles, significant volatile components, high moisture content, and strong adhesiveness. Due to its relatively low price, lignite can effectively reduce power generation costs and improve economic benefits, making its application a trend in the power generation industry. When such coal is stored in a storage of an Eurosilo, as the coal enters the Eurosilo from the central feeding pipe, the falling coal generates a large impact at a bottom landing point. Under the action of this impact force, fine coal particles are ejected in all directions, while surrounding air is compressed to form a strong airflow. This airflow carries the fine coal particles and diffuses to areas with a relatively lower air pressure. After the diffusing airflow reaches a wall of the central telescopic feeding pipe, it climbs upward along the pipe wall, leading the airflow to enter space among pipe walls of several overlapping sections of the feeding pipes. Due to the high moisture in the coal, the coal particles mixed with moisture are highly prone to adhering to the pipe walls. As more and more coal adheres to the wall, it inevitably hinders a relative sliding movement of each section of feeding pipes during telescoping, or even cause jamming (i.e., complete inability to slide). In severe cases, the adhered coal can bond a plurality of sections of feeding pipes into a single whole. When the telescopic movement of the central telescopic feeding pipe fails to synchronize with the upward and downward changes of the spiral frame, it causes a damage to the central telescopic feeding pipe. Repair work for the damaged central telescopic feeding pipe is difficult and time-consuming, which will seriously affect normal coal feeding and discharging operations of the Eurosilo coal storage device, and is not conducive to the normal coal storage operations of the Eurosilo.

[0016] The central telescopic feeding pipe of the Eurosilo adopts a nested structure. When the spiral frame is not at the lowest position in the Eurosilo, several sections of the telescopic feeding pipe are always nested and overlapped (i.e., not extended). At this time, a distance between the lower end of the feeding pipe and the coal falling point is extremely close. During coal falling, part of the coal dust inevitably expands upward along the wall of the feeding pipe with the airflow. This easily causes coal to deposit among the walls of the nested and overlapped feeding pipes. When the accumulated amount of coal reaches a certain level, adhesion among the telescopic feeding pipes forms. This situation is caused by the too close distance between the existing central telescopic feeding pipe of the Eurosilo and the coal falling point.

[0017] The bottom of the central telescopic feeding pipe is directly aligned with the coal falling point at the center of the spiral frame. The central feeding pipe has a circular structure, and the falling coal also exhibits a cylindrical characteristic. However, the coal falling point area adopts a triangular discharge zone. The triangular discharge zone uses a grid for coal accumulation to reduce coal impact, while the area outside the triangle is a plane. Such features are highly prone to causing coal accumulation outside the triangular discharge zone. When the coal accumulates to a certain height, it touches a lower opening of the telescopic feeding pipe. When the coal has strong adhesiveness, the coal entering the gaps between all sections of the feeding pipe causes adhesion among the central telescopic feeding pipes, leading to jamming.

[0018] Due to the nested structure of the central telescopic feeding pipe, it is difficult to arrange coal blockage detection sensors in the existing feeding pipe. Once encountering coal with strong adhesiveness, if the coal at the discharge outlet cannot flow out quickly, the deposition occurs at the bottom coal falling point inside the feeding pipe, leading to coal blockage, which would block the coal from entering the Eurosilo. These accumulated coal keeps piling up to the feeding inlet at the top of the Eurosilo. At this time, the central telescopic feeding pipe is filled with coal, causing a sharp increase in the weight acting on the spiral frame, endangering the safe operation of the Eurosilo and being highly likely to cause major device accidents.

[0019] A part of area of the coal receiving point directly below the lower end of the central telescopic feeding pipe of the Eurosilo has the plane feature. When encountering highly viscous coal, this area is extremely prone to coal accumulation, leading to a reduction in coal discharge flow or even coal blockage, thus interrupting the coal conveying operation into the Eurosilo. Due to the nested structure of the central telescopic feeding pipe, when coal blockage occurs in the discharge area, it is impossible to directly access the blockage area, making manual cleaning difficult.

[0020] The above-mentioned issues are frequent failures that occur in existing Eurosilo coal storage devices when handling highly viscous coal. These failures are precisely caused by the inability of the existing structures to adapt to highly viscous coal.SUMMARY

[0021] An objective of the present invention is to overcome the defects in the prior art and provide a coal blockage-proof feeding pipe apparatus for a coal storage Eurosilo. This apparatus can effectively reduce the jamming and coal blocking phenomena occurring in the central telescopic feeding pipe, prevent a damage to the Eurosilo device, enhance the adaptability of the Eurosilo to viscous coal, and improve the operational stability of coal storage in the Eurosilo.

[0022] The objective of the present invention can be achieved through the following technical scheme: a coal blockage-proof feeding pipe apparatus for a coal storage Eurosilo, comprising a central telescopic feeding pipe, a coal blockage-proof feeding pipe, and a feeding pipe mounting base connected in sequence, wherein a middle part of a first section of round pipes of the central telescopic feeding pipe is of a conical pipe structure with a smaller upper part and a larger lower part; the first section of round pipes is connected to an upper end of the coal blockage-proof feeding pipe; a dust return plate is arranged inside the coal blockage-proof feeding pipe to guide dust-laden gas, generated at a coal falling point below and ascending along a pipe wall, downward, preventing the dust-laden gas from ascending along a cylinder wall into gaps among round pipe walls of the central telescopic feeding pipe; and the coal blockage-proof feeding pipe is provided with an exhaust port to discharge the internal dust-laden gas to the outside of the coal blockage-proof feeding pipe.

[0023] Further, the coal blockage-proof feeding pipe comprises a flange interface, a straight section of the feeding pipe, an inclined section of the feeding pipe, and a triangular straight section of the feeding pipe connected in sequence, wherein the flange interface is connected to a lower port of the first section of round pipes, the dust return plate is arranged at a connection position of the straight section of the feeding pipe and the flange interface, and the exhaust port is opened on an upper end pipe wall of the straight section of the feeding pipe.

[0024] Further, a periphery of the exhaust port is provided with a gas collection ring for collecting the dust-laden gas, the gas collection ring is connected to a gas guide pipe, and the gas guide pipe is configured to guide the collected dust-laden gas to a coal accumulation area below.

[0025] Further, a dust removal device or an exhaust fan is installed at an outlet position of the gas guide pipe to accelerate the discharge of the dust-laden gas.

[0026] Further, a blockage sensor mounting base is arranged at a lower end of the straight section of the feeding pipe for installing and connecting a blockage sensor, the blockage sensor is configured to detect a coal accumulation state inside a feeding pipe apparatus, and a sensor shield is arranged on the blockage sensor mounting base to protect the blockage sensor from being impacted and damaged by falling coal.

[0027] Further, an inspection door that is capable of being opened and closed is opened on a wall surface of the inclined section of the feeding pipe to facilitate inspection and maintenance for a user.

[0028] Further, a lower end of the inclined section of the feeding pipe is provided with a horizontal reinforcement rib and a fixed mounting surface, the fixed mounting surface is connected to the feeding pipe mounting base through a rubber buffer and a guide rod.

[0029] Further, an upper end of the triangular straight section of the feeding pipe is provided with an arc-shaped baffle to form a triangular prism-shaped feeding pipe; two edges at a lower end of the triangular straight section of the feeding pipe directly abuts against two edges of a triangular shape on the feeding area plane of a coal discharge outlet; two sealing plates are arranged on both sides of a feeding opening on the feeding area plane; and through the sealing plates and the triangular straight section of feeding pipe, the feeding area plane and the coal discharge outlet are separated within a guide chute, ensuring that all the falling coal is concentrated onto a triangular inlet before being discharged to prevent the falling coal from accumulating on the feeding area plane.

[0030] Further, an upper port of the first section of round pipes is a sealing ring, which is configured to seal a gap between the first section of round pipes and a second section of round pipes at the upper port of the first section of round pipes, and to ensure an up and down sliding movement of the second section of round pipes relative to the first section of round pipes; the lower port of the first section of round pipes is a flange interface of the first section of round pipes, which is configured to connect and fix with a flange interface of the coal blockage-proof feeding pipe.

[0031] Further, the sealing ring is made of rubber or polyurethane materials.

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] The present invention arranges the coal blockage-proof feeding pipe between the central telescopic feeding pipe and the feeding pipe mounting seat, and designs the first section of round pipes of the central telescopic feeding pipe as the conical pipe structure with a smaller upper part and a larger lower part in the middle, so as to increase the space between the first section of round pipes and the second section of round pipes and avoid coal adhesion between the first section of round pipes and the second section of round pipes. The first section of round pipes is also connected with the upper end of the coal blockage-proof feeding pipe. The dust return plate and the exhaust port are provided inside the coal blockage-proof feeding pipe. The dust return plate is utilized to guide the dust-laden gas ascending along the pipe wall from the coal falling point below to the lower part, preventing the dust-laden gas from ascending along the pipe wall into the gaps among the round pipe walls of the central telescopic feeding pipe. The exhaust port is utilized to discharge the internal dust-laden gas to the outside of the coal blockage-proof feeding pipe. Therefore, the present invention can effectively reduce the jamming and coal blocking phenomena occurring in the central telescopic feeding pipe, prevent a damage to the Eurosilo device, enhance the adaptability of the Eurosilo to viscous coal, and significantly improve the operational stability of coal storage in the Eurosilo.

[0034] The coal blockage-proof feeding pipe designed in the present invention comprises the flange interface, the straight section of the feeding pipe, the inclined section of the feeding pipe, and the triangular straight section of the feeding pipe connected in sequence. The flange interface is connected to the lower port of the first section of round pipes. The coal blocking sensor is installed on the lower end of the straight section of the feeding pipe through the coal blocking sensor mounting seat. The exhaust port is provided on the pipe wall at the upper end of the straight section of the feeding pipe. The inspection door that can be opened and closed is further provided on the wall surface of the inclined section of the feeding pipe. Thereby, the purposes of coal blockage detection and dust-laden gas discharge are achieved, avoiding the damage to the Eurosilo device caused by the large accumulation of coal inside the feeding pipe due to blockage. The present invention is provided with the annular gas collection ring and the gas guide

[0035] pipe outside the exhaust port, which can collect the dust-laden gas discharged from the exhaust port in the gas collection ring, and then guide it to the coal accumulation area below through the gas guide pipe. In addition, the dust removal device can be installed at the outlet of the gas guide pipe to purify the dust-laden gas or the exhaust fan can be installed to accelerate the discharge of the dust-laden gas, thereby effectively preventing the dust-laden gas from climbing upward along the pipe wall in the central telescopic feeding pipe and entering the gaps among the pipe walls, reducing the coal adhered to the pipe walls, and improving the reliability of the sliding movement among the round pipes of the central telescopic feeding pipe.

[0036] The present invention adopts a circular pipe wall for the upper part of the coal blockage-proof feeding pipe, i.e., the straight section of the feeding pipe, and the inclined section of the feeding pipe for the lower part. The inclined section is designed to match the size of the triangular inlet of the coal discharge outlet at the coal falling point. The lower part is composed of the triangular straight section of feeding pipe and the arc baffle to form the triangular prismatic feeding pipe. The two sides of the lower end of the feeding pipe directly abuts against the two sides of the triangle on the plane of the coal falling area of the coal discharge outlet. Two sealing plates are arranged on both sides of the coal discharge outlet on the plane of the coal falling area. In this way, the plane of the coal falling area and the coal discharge outlet are separated by the sealing plates and the triangular straight section of feeding pipe in the guide chute, ensuring that all the falling coal is concentrated on the triangular inlet and then discharged. This avoids the accumulation of falling coal on the plane of the coal falling area and eliminates coal accumulation on the plane of the coal falling area. The coal falling from the central telescopic feeding pipe of the Eurosilo to the coal falling area at the bottom would not accumulate on the plane of the coal falling area, but directly fall onto the coal discharge outlet and enter the Eurosilo through the outlet. Due to the smooth surfaces of the inclined section of the feeding pipe, the triangular straight section of feeding pipe, and the arc baffle, and the angle between the inclined surface and the horizontal plane, the highly viscous coal cannot accumulate in the guide chute at the bottom of the central telescopic feeding pipe of the Eurosilo, which improves the pass ability of the Eurosilo for viscous coal.BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG. 1 is a schematic diagram of an overall structure of an Eurosilo;

[0038] FIG. 2 is a structural schematic diagram of an existing central telescopic feeding pipe;

[0039] FIG. 3 is a structural schematic diagram of a guide chute;

[0040] FIG. 4 is a schematic diagram of a connection between the existing central telescopic feeding pipe and a coal falling point;

[0041] FIG. 5 is a cross-sectional schematic diagram of the connection between the existing central telescopic feeding pipe and the coal falling point;

[0042] FIG. 6 is an installation schematic diagram of the present invention;

[0043] FIG. 7 is a cross-sectional schematic diagram of FIG. 6;

[0044] FIG. 8 is a schematic diagram of a coal blockage-proof feeding pipe in the present invention;

[0045] FIG. 9 is a schematic diagram of the central telescopic feeding pipe in the present invention;

[0046] FIG. 10 is a schematic diagram of a connection between a gas collection ring and a gas guide pipe in the present invention; and

[0047] FIG. 11 is an assembly schematic diagram of the coal blockage-proof feeding pipe in the present invention.DESCRIPTION OF THE EMBODIMENTS

[0048] The present invention will be elaborated hereafter in conjunction with the accompanying drawings and specific embodiments.Embodiments

[0049] As shown in FIG. 5, an existing central feeding pipe 6 of the Eurosilo is composed of several concentrically nested round pipes with different diameters. Two adjacent round pipes can drag each other, forming a telescopic feeding pipe apparatus with a group of round pipes. When coal adheres to pipe walls or gaps 15 among nested and overlapped pipe walls, the adhered coal hinders a normal sliding movement among the round pipes. Since lower ends of the group of overlapped round pipes are close to a coal falling point, and the coal falling point of the Eurosilo adopts a method of reducing an impact force of coal on a bearing surface through accumulated coal, it is easy to cause a lower end of the telescopic feeding pipe to directly contact the accumulated coal, leading to occurrence of various failures. In addition, a structure of the existing coal falling point of the Eurosilo makes it difficult for personnel to enter and handle the situation.

[0050] Once the central feeding pipe is blocked by coal, it cannot be stopped in time with feedback. These problems result in reduction of reliability, difficult personnel handling, high maintenance costs, and long maintenance time when the Eurosilo stores highly viscous coal.

[0051] To address this, the present solution improves the structure and mounting connection of the existing central telescopic feeding pipe of the Eurosilo (a first section of round pipes 6-1 of the central telescopic feeding pipe is directly connected to a mounting interface 17-1 of a feeding pipe mounting seat 17 on a guide chute 10), so as to solve various related problems and deficiencies that occur when the existing Eurosilo stores the highly viscous coal. As shown in FIG. 6 and FIG. 7, a coal blockage-proof feeding pipe apparatus for a coal storage Eurosilo is provided. After improvement, a coal blockage-proof feeding pipe 20 is added between the central telescopic feeding pipe 6 and the feeding pipe mounting base 17 on the guide chute 10. The coal blockage-proof feeding pipe 20 enables coal blockage detection, dust-laden gas discharge, and coal accumulation at the coal falling point, thereby addressing a telescopic jamming issue of the central telescopic feeding pipe 6 and enhancing adaptability of the Eurosilo to various types of coal. An upper end of the coal blockage-proof feeding pipe 20 is fixedly connected to a first section of round pipes 6-111 of the improved central telescopic feeding pipe 6 through a flange. A lower part of the coal blockage-proof feeding pipe 20 is connected to the feeding pipe mounting seat 17 via a fixed mounting surface 20-8, still adopting a connection manner of a rubber buffer 18 and a guide rod 19. This ensures that the entire central telescopic feeding pipe 6, coal blockage-proof feeding pipe 20, and the coal falling point do not transmit impact forces generated by coal entry to each other.

[0052] As shown in FIG. 8, the coal blockage-proof feeding pipe 20 is mainly consisted of components such as a flange interface 20-1. an exhaust port 20-2, a straight section of feeding pipe 20-3, an inclined section of feeding pipe 20-4, a horizontal reinforcing rib plate 20-5, a triangular straight section of feeding pipe 20-6, an arc baffle 20-7, a fixed mounting surface 20-8, a fastening bolt 20-9, an inspection door 20-10, a coal blockage sensor mounting base 20-11.

[0053] The upper port of the coal blockage-proof feeding pipe 20 is the flange interface 20-1, which is connected to the lower port of the improved central telescopic feeding pipe 6 through the flange. The lower port of the coal blockage-proof feeding pipe is the fixed mounting surface 20-8, which can be connected to the feeding pipe mounting seat 17 on the existing guide chute 10. A connection manner is the same as that of the first section of round pipes 6-1 of the existing central telescopic feeding pipe 6, and it is also connected through the rubber buffer 18 and the guide rod 19.

[0054] As shown in FIG. 9, an upper port of the first section of round pipes 6-111 of the improved central telescopic feeding pipe 6 is a sealing ring 6-111-2, which seals a gap between the first section of round pipes 6-111 and the second section of round pipes 6-2 at the upper port of the first section of round pipes 6-111, ensuring that the second section of round pipes 6-2 can slide up and down relative to the first section of round pipes 6-111. The sealing ring 6-111-2 can be made of rubber or polyurethane and other polymer compounds. The lower port is a flange interface 6-111-1 of the first section of round pipes, which can be connected and fixed to the flange interface 20-1 of the coal blockage-proof feeding pipe 20. A middle part of the first section of round pipes 6-111 is of a conical pipe with a smaller upper part and a larger lower part, so as to increase space between it and the second section of round pipes 6-2, preventing coal from adhering between it and the second section of round pipes.

[0055] To collect the dust-laden gas discharged from the exhaust port 20-2 of the coal blockage-proof feeding pipe 20, a gas collection ring 21-1 and a gas guide pipe 21-2 are further configured on the coal blockage-proof feeding pipe 20 (as shown in FIG. 10), and an assembly effect is shown in FIG. 11.

[0056] In a practical application, first, the position of overlapped round pipes of the unextended portion of the central telescopic feeding pipe 6 is raised, and a coal blockage-proof feeding pipe 20 is placed between it and the feeding pipe mounting base 17 (if applied to the modification of the existing Eurosilo central feeding pipe, when the Eurosilo is full and a screw conveyor 9 and a screw platform 14 are at their highest positions, it is necessary to pre-confirm an upper stroke margin of the telescopic feeding pipe 6 during retraction or appropriately reduce a coal storage volume of the Eurosilo before installing the coal blockage-proof feeding pipe 20. If applied to a newly designed Eurosilo, the modification and installation can be carried out directly). The upper port of the coal blockage-proof feeding pipe 20 is fixedly connected to the first section of round pipes 6-111 of the central telescopic feeding pipe 6 via a flange, and the middle fixed mounting surface 20-8 is connected to the feeding pipe mounting base 17. Inside the coal blockage-proof feeding pipe 20, a dust return plate 20-12 is arranged to guide the dust-laden gas, generated at the coal falling point below and ascending along the pipe wall, downward, preventing the dust-laden gas from ascending along the cylinder wall into the gaps 15 among the round pipe walls of the central telescopic feeding pipe. Simultaneously, a certain number of exhaust ports 20-2 are opened on the circumference of the pipe wall at this position to discharge part of the dust-laden gas outside the coal blockage-proof feeding pipe 20, and an annular gas collection ring 21-1 and a gas guide pipe 21-2 are arranged around the exhaust port 20-2 to collect the dust-laden gas discharged from the exhaust port 20-2 into the gas collection ring 21-1. The collected gas is then guided to a coal accumulation area below through the gas guide pipe 21-2. Furthermore, a dust removal device can be installed at the outlet of the gas guide pipe 21-2 to purify the dust-laden gas or an exhaust fan can be installed to accelerate discharge of the dust-laden gas. This method effectively prevents the dust-laden gas from climbing upward along the pipe wall of the central telescopic feeding pipe and entering the gap 15 between the pipe walls, thereby reducing adhered coal on the pipe walls and improving the reliability of the sliding movement among the round pipes of the central telescopic feeding pipe.

[0057] An inspection door 20-10 is provided on the coal blockage-proof feeding pipe 20. The inspection door 20-10 is normally closed and can be opened when handling of personnel is needed, which facilitates personnel to deal with the abnormal conditions at the coal falling point and ensures the safety of personnel.

[0058] A coal blockage sensor 22 is arranged on the coal blockage-proof feeding pipe 20, for which a coal blockage sensor mounting base 20-11 needs to be provided, and the coal blockage sensor 22 is protected from damage caused by falling coal through a sensor shield 20-11-1. The coal blockage sensor 22 is configured to detect coal accumulation inside the coal blockage-proof feeding pipe 20. When the height of the coal pile reaches a certain position, it sends a signal, which can be used to control the reduction or cessation of coal feeding. Once the coal blockage is cleared, coal feeding resumes. This avoids coal accumulation at the falling point from contacting the central feeding pipe wall, thereby reducing jamming faults during the telescopic movement of the telescopic feeding pipe and preventing safety issues in the Eurosilo caused by coal blockage in the central feeding pipe accumulating to the top.

[0059] A circular pipe wall is adopted for the upper part of the coal blockage-proof feeding pipe 20, i.e., the straight section 20-3 of the feeding pipe, and the inclined section 20-4 of the feeding pipe is adopted for the lower part of the coal blockage-proof feeding pipe 20. The inclined section is designed to match the size of the triangular inlet 16-2 of the coal discharge outlet 16 at the coal falling point. The lower part is composed of the triangular straight section 20-6 of feeding pipe and the arc baffle 20-7 to form the triangular prismatic feeding pipe. The two sides of the lower end of the feeding pipe directly abuts against the two sides of the triangle on the plane 14-1 of the coal falling area of the coal discharge outlet 16. Two sealing plates 23 are arranged on both sides of the coal discharge outlet on the plane 14-1 of the coal falling area. Through the sealing plates 23 and the triangular straight section 20-6 of feeding pipe of the coal blockage-proof feeding pipe 20, the feeding area plane 14-1 and the coal discharge outlet 16 are separated within a guide chute 10, ensuring that all the falling coal is concentrated onto a triangular inlet 16-2 before being discharged, thereby preventing the falling coal from accumulating on the feeding area plane 14-1 and eliminating accumulated coal on the plane 14-1 of the coal falling area. Using the coal blockage-proof feeding pipe 20 designed in this scheme, coal entering from the central telescopic feeding pipe of the Eurosilo to the bottom coal falling area would not accumulate on the plane 14-1 of coal falling area but directly fall onto the coal discharge outlet 16 and then enter the Eurosilo through this outlet. Through the special structure of the coal blockage-proof feeding pipe 20 (the inclined section 20-4 of the coal feeding pipe, the triangular straight-section 20-6 of feeding pipe, and the arc baffle 20-7 feature smooth surfaces, and an angle between the inclined surface and the horizontal plane greater than) 70°, even for highly viscous coal, it cannot accumulate in the bottom guide chute 10 of the central telescopic feeding pipe 6 of the Eurosilo, effectively improving the capacity of the Eurosilo to handle viscous coal. In practical applications, the triangular straight section 20-6 of feeding pipe and the inclined section 20-4 of feeding pipe can be designed using wear-resistant materials or internally equipped with wear-resistant support plates (such as ceramics or wear-resistant steel plates) to further enhance a service life of the coal blockage-proof feeding pipe 20.

[0060] In summary, the present scheme can reduce various jamming and coal blockage failures of the central telescopic feeding pipe 6 caused by wet and sticky coal, minimizing severe consequences resulting from the inability of the Eurosilo to store coal normally. It also integrates functions of coal blockage detection, dust-laden gas exhaust, and prevention of coal accumulation at the coal falling point.

[0061] It will be apparent to those skilled in the art that various modifications and variations can be made to the disclosed embodiments without departing from the scope or spirit of the disclosure. In view of the foregoing, it is intended that the disclosure covers modifications and variations provided that they fall within the scope of the following claims and their equivalents.

Examples

embodiments

[0049]As shown in FIG. 5, an existing central feeding pipe 6 of the Eurosilo is composed of several concentrically nested round pipes with different diameters. Two adjacent round pipes can drag each other, forming a telescopic feeding pipe apparatus with a group of round pipes. When coal adheres to pipe walls or gaps 15 among nested and overlapped pipe walls, the adhered coal hinders a normal sliding movement among the round pipes. Since lower ends of the group of overlapped round pipes are close to a coal falling point, and the coal falling point of the Eurosilo adopts a method of reducing an impact force of coal on a bearing surface through accumulated coal, it is easy to cause a lower end of the telescopic feeding pipe to directly contact the accumulated coal, leading to occurrence of various failures. In addition, a structure of the existing coal falling point of the Eurosilo makes it difficult for personnel to enter and handle the situation.

[0050]Once the central feeding pipe i...

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims the priority benefit of China application serial no. 202410980976.3, filed on Jul. 22, 2024. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.BACKGROUNDTechnical Field

[0002] The present invention relates to the technical field of devices for thermal power plants, and particularly relates to a coal blockage-proof feeding pipe apparatus for coal storage Eurosilo.Description of Related Art

[0003] Eurosilo coal storage is a latest environmentally friendly method for coal storage. Currently, domestic thermal power enterprises have introduced an Eurosilo technology for the coal storage. However, some issues have arisen during the use of the Eurosilo coal storage, which directly affect a safe and stable operation of an Eurosilo.

[0004] Numerous devices are arranged inside the Eurosilo. These devices are primarily used for stacking and storing coal from low to high levels within the Eurosilo, extracting coal in the Eurosilo from high to low levels, and outputting coal from the Eurosilo.

[0005] As shown in FIG. 1, the existing coal storage Eurosilo mainly consists of components such as an Eurosilo cylindrical silo wall 1, an Eurosilo feeding inlet 2, an Eurosilo top trestle 3, a rotary trestle 4, a rotary trestle traveling apparatus 5, a central telescopic feeding pipe 6, a spiral frame lifting wire rope 7, a spiral frame 8, a screw conveyor 9, a guide chute 10, a spiral frame type-A frame 11, a central winch platform 12, a central rotary platform 13, and a spiral frame central platform 14. An upper port of the central telescopic feeding pipe 6 connects to the Eurosilo feeding inlet 2, while its lower port connects to the guide chute 10 on the spiral frame central platform 14. As a feeding channel of the Eurosilo, the central telescopic feeding pipe 6 extends and retracts with ascending and descending of the spiral frame central platform 14. Coal enters the guide chute 10 through the central telescopic feeding pipe 6 and is dropped into the Eurosilo via a coal outlet 16 to accumulate inside.

[0006] As shown in FIG. 2, the central telescopic feeding pipe 6 is composed of several concentric sections of round pipes of different diameters. Taking five sections of round pipes as an example, the central telescopic feeding pipe 6 consists of a first section of round pipes 6-1, a foundation flange of first section of round pipes 6-1-1, guide rod holes 6-1-2, buffer fixing bolt holes 6-1-3, reinforcing ribs 6-1-4, limit stop rings 6-1-5, second section of round pipes 6-2, third section of round pipes 6-3, fourth section of round pipes 6-4, and fifth section of round pipes 6-5.

[0007] As shown in FIG. 3 to FIG. 5, the central telescopic feeding pipe 6 is connected to the guide chute 10. A connection structure mainly consists of the foundation flange of first section of round pipes 6-1-1, a guide chute 10, a spiral frame central platform 14, a coal dropping outlet 16, a grating plate 16-1, a feeding pipe mounting base 17, a mounting interface 17-1, a fixed support frame 17-2, rubber buffers 18, guide rods 19, and buffer fixing bolt holes 17-1. The foundation flange of the first section of round pipes 6-1-1 of the first section of round pipes 6-1 of the central telescopic feeding pipe 6 is connected to the mounting interface 17-1 on the feeding pipe mounting base 17 through the rubber buffers 18. The rubber buffers 18 provides cushioning, while the guide rods 19 ensure a proper amount of movement between the first section of round pipes 6-1 of the central telescopic feeding pipe 6 and the feeding pipe mounting base 17 to reduce impact forces. It also ensures axial movement along the guide rods 19 without causing deflection.

[0008] A discharging outlet at a lower end of the central telescopic feeding pipe 6 is directly aligned with the coal dropping outlet 16, the grating plate 16-1, and the dropping area plane (coal accumulation zone) 14-1 on the spiral frame central platform 14. This plane is also an area where coal accumulates during a feeding process of the Eurosilo. The accumulated coal cannot be discharged automatically, leading to an increasing accumulation that may even reach the lower port of the central telescopic feeding pipe. Consequently, the coal may affect the normal telescopic motion of the telescopic feeding pipe.

[0009] It can thus be seen that the device arranged inside the Eurosilo mainly consists of the rotary trestle, a hoisting and lifting apparatus, a trestle traveling mechanism, a central rotary platform, a central telescopic feeding pipe, a spiral frame, and a spiral stacking and reclaiming apparatus. The top of the Eurosilo is equipped with a coal conveying trestle, which contains a belt conveyor. Coal is transported by the conveyor to the inlet of the central telescopic falling pipe at the upper part of the Eurosilo. It then enters the interior of the Eurosilo through the upper port of the central telescopic falling pipe installed on the central rotary platform. The coal reaches the spiral frame at the lower outlet of the central telescopic falling pipe. The spiral frame is equipped with an apparatus for stacking and reclaiming coal within the Eurosilo, namely the screw conveyor. The screw conveyor may rotate in both forward and reverse directions, thereby achieving the stacking and reclaiming of coal within the Eurosilo.

[0010] When the screw conveyor rotates forward, it pushes the coal emerging from the bottom of the central telescopic feeding pipe along the radius of the Eurosilo cylindrical body to a circumferential direction until the coal reaches the Eurosilo wall. The spiral frame and the rotary trestle simultaneously perform horizontal rotational movement around the central axis of the Eurosilo, allowing the screw conveyor to uniformly stack the incoming coal inside the Eurosilo. When reclaiming coal from the Eurosilo, the screw conveyor rotates in an opposite direction to that during stacking, converging the coal on a surface of a coal pile toward the circle center, which is then discharged through an activated feeder.

[0011] During the stacking of coal into the Eurosilo, the spiral frame always maintains a fixed distance (30 cm to 50 cm) from an upper surface of the coal within the Eurosilo. During coal reclaiming, the screw conveyor must be in contact with the upper surface of the coal pile within the Eurosilo.

[0012] When coal is fed into the Eurosilo from outside, it passes through the central telescopic feeding pipe. An upper end of the central telescopic feeding pipe is connected to the coal feeding pipe outlet on the central platform, and the lower end thereof is connected to a coal receiving point on the spiral frame. Therefore, the coal entering the Eurosilo must pass through the central telescopic feeding pipe. During coal stacking, the length of the central telescopic feeding pipe continues to shorten with the lifting of the spiral frame. When coal is taken out of the Eurosilo, the length of the central telescopic feeding pipe continues to extend with the descent of the spiral frame. The function of the central telescopic feeding pipe is to prevent the coal entering the

[0013] Eurosilo from dispersing and spilling during a falling process, so that the falling coal always lands on the coal receiving point of the spiral frame, preventing the coal from directly impacting the coal pile. At the same time, it reduces coal dust and ensures the safety of coal stacking in the Eurosilo.

[0014] Since the central telescopic feeding pipe is composed of several concentric sections of round pipes with different diameters, each section of the round pipes having the same length. From the top down, the diameters of the round pipes increase sequentially from the first section to the last. This design allows each upper section to be inserted into the adjacent lower section, and this insertion is repeated sequentially so that all round pipes can eventually be inserted into the last one, forming a so-called transport state. Each section of the round pipes is equipped with stepped sections of different diameters at both ends as sliding limit connectors, which allow adjacent sections to slide against each other while remaining hooked and connected without separation, and also enable relative sliding along the central axis of the round pipe body. This structure enables several sections of the feeding pipes to be connected along a central axis, unfolding or contracting section by section as a distance between the two ends extends or retracts. This structural feature allows a distance between the feeding inlet and a discharging outlet of the central telescopic feeding pipe to change with a distance between the rotary trestle and the spiral frame, ensuring that materials always pass through the telescopic feeding pipe. When the spiral frame is at its highest position, the central telescopic feeding pipe is retracted to its shortest length. Since the central feeding pipe is in a vertical state, each section of the round pipes is stacked on the lower one under action of gravity. When the spiral frame descends, starting from a topmost first section of round pipes, each section is sequentially pulled out one by one until a penultimate section of round pipes is fully pulled out. At this point, the spiral frame has reached a lowest part of the Eurosilo, and all coal in the Eurosilo has been emptied. When coal is fed into the Eurosilo for stacking, the spiral frame gradually rises, and the fully extended central telescopic feeding pipe begins to retract. During retraction, the penultimate section of round pipes from the bottom is inserted into the last section of round pipes. When fully inserted, the penultimate section of round pipes remains in a stationary state relative to the last section of round pipes. As the spiral frame continues to ascend, the third-to-last section of round pipes starts to insert into the penultimate section of round pipes. In this way, as the spiral frame rises higher, the central telescopic feeding pipe retracts into a lower section of round pipes. When the spiral frame reaches the highest point, the entire central telescopic feeding pipe is retracted into the lowermost section of round pipes. The extension and retraction of the central telescopic feeding pipe always remain consistent with upward and downward movements of the spiral frame.

[0015] In practical applications, lignite is currently a main type of coal used for power generation in China. It has a high proportion of powdery particles, significant volatile components, high moisture content, and strong adhesiveness. Due to its relatively low price, lignite can effectively reduce power generation costs and improve economic benefits, making its application a trend in the power generation industry. When such coal is stored in a storage of an Eurosilo, as the coal enters the Eurosilo from the central feeding pipe, the falling coal generates a large impact at a bottom landing point. Under the action of this impact force, fine coal particles are ejected in all directions, while surrounding air is compressed to form a strong airflow. This airflow carries the fine coal particles and diffuses to areas with a relatively lower air pressure. After the diffusing airflow reaches a wall of the central telescopic feeding pipe, it climbs upward along the pipe wall, leading the airflow to enter space among pipe walls of several overlapping sections of the feeding pipes. Due to the high moisture in the coal, the coal particles mixed with moisture are highly prone to adhering to the pipe walls. As more and more coal adheres to the wall, it inevitably hinders a relative sliding movement of each section of feeding pipes during telescoping, or even cause jamming (i.e., complete inability to slide). In severe cases, the adhered coal can bond a plurality of sections of feeding pipes into a single whole. When the telescopic movement of the central telescopic feeding pipe fails to synchronize with the upward and downward changes of the spiral frame, it causes a damage to the central telescopic feeding pipe. Repair work for the damaged central telescopic feeding pipe is difficult and time-consuming, which will seriously affect normal coal feeding and discharging operations of the Eurosilo coal storage device, and is not conducive to the normal coal storage operations of the Eurosilo.

[0016] The central telescopic feeding pipe of the Eurosilo adopts a nested structure. When the spiral frame is not at the lowest position in the Eurosilo, several sections of the telescopic feeding pipe are always nested and overlapped (i.e., not extended). At this time, a distance between the lower end of the feeding pipe and the coal falling point is extremely close. During coal falling, part of the coal dust inevitably expands upward along the wall of the feeding pipe with the airflow. This easily causes coal to deposit among the walls of the nested and overlapped feeding pipes. When the accumulated amount of coal reaches a certain level, adhesion among the telescopic feeding pipes forms. This situation is caused by the too close distance between the existing central telescopic feeding pipe of the Eurosilo and the coal falling point.

[0017] The bottom of the central telescopic feeding pipe is directly aligned with the coal falling point at the center of the spiral frame. The central feeding pipe has a circular structure, and the falling coal also exhibits a cylindrical characteristic. However, the coal falling point area adopts a triangular discharge zone. The triangular discharge zone uses a grid for coal accumulation to reduce coal impact, while the area outside the triangle is a plane. Such features are highly prone to causing coal accumulation outside the triangular discharge zone. When the coal accumulates to a certain height, it touches a lower opening of the telescopic feeding pipe. When the coal has strong adhesiveness, the coal entering the gaps between all sections of the feeding pipe causes adhesion among the central telescopic feeding pipes, leading to jamming.

[0018] Due to the nested structure of the central telescopic feeding pipe, it is difficult to arrange coal blockage detection sensors in the existing feeding pipe. Once encountering coal with strong adhesiveness, if the coal at the discharge outlet cannot flow out quickly, the deposition occurs at the bottom coal falling point inside the feeding pipe, leading to coal blockage, which would block the coal from entering the Eurosilo. These accumulated coal keeps piling up to the feeding inlet at the top of the Eurosilo. At this time, the central telescopic feeding pipe is filled with coal, causing a sharp increase in the weight acting on the spiral frame, endangering the safe operation of the Eurosilo and being highly likely to cause major device accidents.

[0019] A part of area of the coal receiving point directly below the lower end of the central telescopic feeding pipe of the Eurosilo has the plane feature. When encountering highly viscous coal, this area is extremely prone to coal accumulation, leading to a reduction in coal discharge flow or even coal blockage, thus interrupting the coal conveying operation into the Eurosilo. Due to the nested structure of the central telescopic feeding pipe, when coal blockage occurs in the discharge area, it is impossible to directly access the blockage area, making manual cleaning difficult.

[0020] The above-mentioned issues are frequent failures that occur in existing Eurosilo coal storage devices when handling highly viscous coal. These failures are precisely caused by the inability of the existing structures to adapt to highly viscous coal.SUMMARY

[0021] An objective of the present invention is to overcome the defects in the prior art and provide a coal blockage-proof feeding pipe apparatus for a coal storage Eurosilo. This apparatus can effectively reduce the jamming and coal blocking phenomena occurring in the central telescopic feeding pipe, prevent a damage to the Eurosilo device, enhance the adaptability of the Eurosilo to viscous coal, and improve the operational stability of coal storage in the Eurosilo.

[0022] The objective of the present invention can be achieved through the following technical scheme: a coal blockage-proof feeding pipe apparatus for a coal storage Eurosilo, comprising a central telescopic feeding pipe, a coal blockage-proof feeding pipe, and a feeding pipe mounting base connected in sequence, wherein a middle part of a first section of round pipes of the central telescopic feeding pipe is of a conical pipe structure with a smaller upper part and a larger lower part; the first section of round pipes is connected to an upper end of the coal blockage-proof feeding pipe; a dust return plate is arranged inside the coal blockage-proof feeding pipe to guide dust-laden gas, generated at a coal falling point below and ascending along a pipe wall, downward, preventing the dust-laden gas from ascending along a cylinder wall into gaps among round pipe walls of the central telescopic feeding pipe; and the coal blockage-proof feeding pipe is provided with an exhaust port to discharge the internal dust-laden gas to the outside of the coal blockage-proof feeding pipe.

[0023] Further, the coal blockage-proof feeding pipe comprises a flange interface, a straight section of the feeding pipe, an inclined section of the feeding pipe, and a triangular straight section of the feeding pipe connected in sequence, wherein the flange interface is connected to a lower port of the first section of round pipes, the dust return plate is arranged at a connection position of the straight section of the feeding pipe and the flange interface, and the exhaust port is opened on an upper end pipe wall of the straight section of the feeding pipe.

[0024] Further, a periphery of the exhaust port is provided with a gas collection ring for collecting the dust-laden gas, the gas collection ring is connected to a gas guide pipe, and the gas guide pipe is configured to guide the collected dust-laden gas to a coal accumulation area below.

[0025] Further, a dust removal device or an exhaust fan is installed at an outlet position of the gas guide pipe to accelerate the discharge of the dust-laden gas.

[0026] Further, a blockage sensor mounting base is arranged at a lower end of the straight section of the feeding pipe for installing and connecting a blockage sensor, the blockage sensor is configured to detect a coal accumulation state inside a feeding pipe apparatus, and a sensor shield is arranged on the blockage sensor mounting base to protect the blockage sensor from being impacted and damaged by falling coal.

[0027] Further, an inspection door that is capable of being opened and closed is opened on a wall surface of the inclined section of the feeding pipe to facilitate inspection and maintenance for a user.

[0028] Further, a lower end of the inclined section of the feeding pipe is provided with a horizontal reinforcement rib and a fixed mounting surface, the fixed mounting surface is connected to the feeding pipe mounting base through a rubber buffer and a guide rod.

[0029] Further, an upper end of the triangular straight section of the feeding pipe is provided with an arc-shaped baffle to form a triangular prism-shaped feeding pipe; two edges at a lower end of the triangular straight section of the feeding pipe directly abuts against two edges of a triangular shape on the feeding area plane of a coal discharge outlet; two sealing plates are arranged on both sides of a feeding opening on the feeding area plane; and through the sealing plates and the triangular straight section of feeding pipe, the feeding area plane and the coal discharge outlet are separated within a guide chute, ensuring that all the falling coal is concentrated onto a triangular inlet before being discharged to prevent the falling coal from accumulating on the feeding area plane.

[0030] Further, an upper port of the first section of round pipes is a sealing ring, which is configured to seal a gap between the first section of round pipes and a second section of round pipes at the upper port of the first section of round pipes, and to ensure an up and down sliding movement of the second section of round pipes relative to the first section of round pipes; the lower port of the first section of round pipes is a flange interface of the first section of round pipes, which is configured to connect and fix with a flange interface of the coal blockage-proof feeding pipe.

[0031] Further, the sealing ring is made of rubber or polyurethane materials.

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] The present invention arranges the coal blockage-proof feeding pipe between the central telescopic feeding pipe and the feeding pipe mounting seat, and designs the first section of round pipes of the central telescopic feeding pipe as the conical pipe structure with a smaller upper part and a larger lower part in the middle, so as to increase the space between the first section of round pipes and the second section of round pipes and avoid coal adhesion between the first section of round pipes and the second section of round pipes. The first section of round pipes is also connected with the upper end of the coal blockage-proof feeding pipe. The dust return plate and the exhaust port are provided inside the coal blockage-proof feeding pipe. The dust return plate is utilized to guide the dust-laden gas ascending along the pipe wall from the coal falling point below to the lower part, preventing the dust-laden gas from ascending along the pipe wall into the gaps among the round pipe walls of the central telescopic feeding pipe. The exhaust port is utilized to discharge the internal dust-laden gas to the outside of the coal blockage-proof feeding pipe. Therefore, the present invention can effectively reduce the jamming and coal blocking phenomena occurring in the central telescopic feeding pipe, prevent a damage to the Eurosilo device, enhance the adaptability of the Eurosilo to viscous coal, and significantly improve the operational stability of coal storage in the Eurosilo.

[0034] The coal blockage-proof feeding pipe designed in the present invention comprises the flange interface, the straight section of the feeding pipe, the inclined section of the feeding pipe, and the triangular straight section of the feeding pipe connected in sequence. The flange interface is connected to the lower port of the first section of round pipes. The coal blocking sensor is installed on the lower end of the straight section of the feeding pipe through the coal blocking sensor mounting seat. The exhaust port is provided on the pipe wall at the upper end of the straight section of the feeding pipe. The inspection door that can be opened and closed is further provided on the wall surface of the inclined section of the feeding pipe. Thereby, the purposes of coal blockage detection and dust-laden gas discharge are achieved, avoiding the damage to the Eurosilo device caused by the large accumulation of coal inside the feeding pipe due to blockage. The present invention is provided with the annular gas collection ring and the gas guide

[0035] pipe outside the exhaust port, which can collect the dust-laden gas discharged from the exhaust port in the gas collection ring, and then guide it to the coal accumulation area below through the gas guide pipe. In addition, the dust removal device can be installed at the outlet of the gas guide pipe to purify the dust-laden gas or the exhaust fan can be installed to accelerate the discharge of the dust-laden gas, thereby effectively preventing the dust-laden gas from climbing upward along the pipe wall in the central telescopic feeding pipe and entering the gaps among the pipe walls, reducing the coal adhered to the pipe walls, and improving the reliability of the sliding movement among the round pipes of the central telescopic feeding pipe.

[0036] The present invention adopts a circular pipe wall for the upper part of the coal blockage-proof feeding pipe, i.e., the straight section of the feeding pipe, and the inclined section of the feeding pipe for the lower part. The inclined section is designed to match the size of the triangular inlet of the coal discharge outlet at the coal falling point. The lower part is composed of the triangular straight section of feeding pipe and the arc baffle to form the triangular prismatic feeding pipe. The two sides of the lower end of the feeding pipe directly abuts against the two sides of the triangle on the plane of the coal falling area of the coal discharge outlet. Two sealing plates are arranged on both sides of the coal discharge outlet on the plane of the coal falling area. In this way, the plane of the coal falling area and the coal discharge outlet are separated by the sealing plates and the triangular straight section of feeding pipe in the guide chute, ensuring that all the falling coal is concentrated on the triangular inlet and then discharged. This avoids the accumulation of falling coal on the plane of the coal falling area and eliminates coal accumulation on the plane of the coal falling area. The coal falling from the central telescopic feeding pipe of the Eurosilo to the coal falling area at the bottom would not accumulate on the plane of the coal falling area, but directly fall onto the coal discharge outlet and enter the Eurosilo through the outlet. Due to the smooth surfaces of the inclined section of the feeding pipe, the triangular straight section of feeding pipe, and the arc baffle, and the angle between the inclined surface and the horizontal plane, the highly viscous coal cannot accumulate in the guide chute at the bottom of the central telescopic feeding pipe of the Eurosilo, which improves the pass ability of the Eurosilo for viscous coal.BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG. 1 is a schematic diagram of an overall structure of an Eurosilo;

[0038] FIG. 2 is a structural schematic diagram of an existing central telescopic feeding pipe;

[0039] FIG. 3 is a structural schematic diagram of a guide chute;

[0040] FIG. 4 is a schematic diagram of a connection between the existing central telescopic feeding pipe and a coal falling point;

[0041] FIG. 5 is a cross-sectional schematic diagram of the connection between the existing central telescopic feeding pipe and the coal falling point;

[0042] FIG. 6 is an installation schematic diagram of the present invention;

[0043] FIG. 7 is a cross-sectional schematic diagram of FIG. 6;

[0044] FIG. 8 is a schematic diagram of a coal blockage-proof feeding pipe in the present invention;

[0045] FIG. 9 is a schematic diagram of the central telescopic feeding pipe in the present invention;

[0046] FIG. 10 is a schematic diagram of a connection between a gas collection ring and a gas guide pipe in the present invention; and

[0047] FIG. 11 is an assembly schematic diagram of the coal blockage-proof feeding pipe in the present invention.DESCRIPTION OF THE EMBODIMENTS

[0048] The present invention will be elaborated hereafter in conjunction with the accompanying drawings and specific embodiments.Embodiments

[0049] As shown in FIG. 5, an existing central feeding pipe 6 of the Eurosilo is composed of several concentrically nested round pipes with different diameters. Two adjacent round pipes can drag each other, forming a telescopic feeding pipe apparatus with a group of round pipes. When coal adheres to pipe walls or gaps 15 among nested and overlapped pipe walls, the adhered coal hinders a normal sliding movement among the round pipes. Since lower ends of the group of overlapped round pipes are close to a coal falling point, and the coal falling point of the Eurosilo adopts a method of reducing an impact force of coal on a bearing surface through accumulated coal, it is easy to cause a lower end of the telescopic feeding pipe to directly contact the accumulated coal, leading to occurrence of various failures. In addition, a structure of the existing coal falling point of the Eurosilo makes it difficult for personnel to enter and handle the situation.

[0050] Once the central feeding pipe is blocked by coal, it cannot be stopped in time with feedback. These problems result in reduction of reliability, difficult personnel handling, high maintenance costs, and long maintenance time when the Eurosilo stores highly viscous coal.

[0051] To address this, the present solution improves the structure and mounting connection of the existing central telescopic feeding pipe of the Eurosilo (a first section of round pipes 6-1 of the central telescopic feeding pipe is directly connected to a mounting interface 17-1 of a feeding pipe mounting seat 17 on a guide chute 10), so as to solve various related problems and deficiencies that occur when the existing Eurosilo stores the highly viscous coal. As shown in FIG. 6 and FIG. 7, a coal blockage-proof feeding pipe apparatus for a coal storage Eurosilo is provided. After improvement, a coal blockage-proof feeding pipe 20 is added between the central telescopic feeding pipe 6 and the feeding pipe mounting base 17 on the guide chute 10. The coal blockage-proof feeding pipe 20 enables coal blockage detection, dust-laden gas discharge, and coal accumulation at the coal falling point, thereby addressing a telescopic jamming issue of the central telescopic feeding pipe 6 and enhancing adaptability of the Eurosilo to various types of coal. An upper end of the coal blockage-proof feeding pipe 20 is fixedly connected to a first section of round pipes 6-111 of the improved central telescopic feeding pipe 6 through a flange. A lower part of the coal blockage-proof feeding pipe 20 is connected to the feeding pipe mounting seat 17 via a fixed mounting surface 20-8, still adopting a connection manner of a rubber buffer 18 and a guide rod 19. This ensures that the entire central telescopic feeding pipe 6, coal blockage-proof feeding pipe 20, and the coal falling point do not transmit impact forces generated by coal entry to each other.

[0052] As shown in FIG. 8, the coal blockage-proof feeding pipe 20 is mainly consisted of components such as a flange interface 20-1. an exhaust port 20-2, a straight section of feeding pipe 20-3, an inclined section of feeding pipe 20-4, a horizontal reinforcing rib plate 20-5, a triangular straight section of feeding pipe 20-6, an arc baffle 20-7, a fixed mounting surface 20-8, a fastening bolt 20-9, an inspection door 20-10, a coal blockage sensor mounting base 20-11.

[0053] The upper port of the coal blockage-proof feeding pipe 20 is the flange interface 20-1, which is connected to the lower port of the improved central telescopic feeding pipe 6 through the flange. The lower port of the coal blockage-proof feeding pipe is the fixed mounting surface 20-8, which can be connected to the feeding pipe mounting seat 17 on the existing guide chute 10. A connection manner is the same as that of the first section of round pipes 6-1 of the existing central telescopic feeding pipe 6, and it is also connected through the rubber buffer 18 and the guide rod 19.

[0054] As shown in FIG. 9, an upper port of the first section of round pipes 6-111 of the improved central telescopic feeding pipe 6 is a sealing ring 6-111-2, which seals a gap between the first section of round pipes 6-111 and the second section of round pipes 6-2 at the upper port of the first section of round pipes 6-111, ensuring that the second section of round pipes 6-2 can slide up and down relative to the first section of round pipes 6-111. The sealing ring 6-111-2 can be made of rubber or polyurethane and other polymer compounds. The lower port is a flange interface 6-111-1 of the first section of round pipes, which can be connected and fixed to the flange interface 20-1 of the coal blockage-proof feeding pipe 20. A middle part of the first section of round pipes 6-111 is of a conical pipe with a smaller upper part and a larger lower part, so as to increase space between it and the second section of round pipes 6-2, preventing coal from adhering between it and the second section of round pipes.

[0055] To collect the dust-laden gas discharged from the exhaust port 20-2 of the coal blockage-proof feeding pipe 20, a gas collection ring 21-1 and a gas guide pipe 21-2 are further configured on the coal blockage-proof feeding pipe 20 (as shown in FIG. 10), and an assembly effect is shown in FIG. 11.

[0056] In a practical application, first, the position of overlapped round pipes of the unextended portion of the central telescopic feeding pipe 6 is raised, and a coal blockage-proof feeding pipe 20 is placed between it and the feeding pipe mounting base 17 (if applied to the modification of the existing Eurosilo central feeding pipe, when the Eurosilo is full and a screw conveyor 9 and a screw platform 14 are at their highest positions, it is necessary to pre-confirm an upper stroke margin of the telescopic feeding pipe 6 during retraction or appropriately reduce a coal storage volume of the Eurosilo before installing the coal blockage-proof feeding pipe 20. If applied to a newly designed Eurosilo, the modification and installation can be carried out directly). The upper port of the coal blockage-proof feeding pipe 20 is fixedly connected to the first section of round pipes 6-111 of the central telescopic feeding pipe 6 via a flange, and the middle fixed mounting surface 20-8 is connected to the feeding pipe mounting base 17. Inside the coal blockage-proof feeding pipe 20, a dust return plate 20-12 is arranged to guide the dust-laden gas, generated at the coal falling point below and ascending along the pipe wall, downward, preventing the dust-laden gas from ascending along the cylinder wall into the gaps 15 among the round pipe walls of the central telescopic feeding pipe. Simultaneously, a certain number of exhaust ports 20-2 are opened on the circumference of the pipe wall at this position to discharge part of the dust-laden gas outside the coal blockage-proof feeding pipe 20, and an annular gas collection ring 21-1 and a gas guide pipe 21-2 are arranged around the exhaust port 20-2 to collect the dust-laden gas discharged from the exhaust port 20-2 into the gas collection ring 21-1. The collected gas is then guided to a coal accumulation area below through the gas guide pipe 21-2. Furthermore, a dust removal device can be installed at the outlet of the gas guide pipe 21-2 to purify the dust-laden gas or an exhaust fan can be installed to accelerate discharge of the dust-laden gas. This method effectively prevents the dust-laden gas from climbing upward along the pipe wall of the central telescopic feeding pipe and entering the gap 15 between the pipe walls, thereby reducing adhered coal on the pipe walls and improving the reliability of the sliding movement among the round pipes of the central telescopic feeding pipe.

[0057] An inspection door 20-10 is provided on the coal blockage-proof feeding pipe 20. The inspection door 20-10 is normally closed and can be opened when handling of personnel is needed, which facilitates personnel to deal with the abnormal conditions at the coal falling point and ensures the safety of personnel.

[0058] A coal blockage sensor 22 is arranged on the coal blockage-proof feeding pipe 20, for which a coal blockage sensor mounting base 20-11 needs to be provided, and the coal blockage sensor 22 is protected from damage caused by falling coal through a sensor shield 20-11-1. The coal blockage sensor 22 is configured to detect coal accumulation inside the coal blockage-proof feeding pipe 20. When the height of the coal pile reaches a certain position, it sends a signal, which can be used to control the reduction or cessation of coal feeding. Once the coal blockage is cleared, coal feeding resumes. This avoids coal accumulation at the falling point from contacting the central feeding pipe wall, thereby reducing jamming faults during the telescopic movement of the telescopic feeding pipe and preventing safety issues in the Eurosilo caused by coal blockage in the central feeding pipe accumulating to the top.

[0059] A circular pipe wall is adopted for the upper part of the coal blockage-proof feeding pipe 20, i.e., the straight section 20-3 of the feeding pipe, and the inclined section 20-4 of the feeding pipe is adopted for the lower part of the coal blockage-proof feeding pipe 20. The inclined section is designed to match the size of the triangular inlet 16-2 of the coal discharge outlet 16 at the coal falling point. The lower part is composed of the triangular straight section 20-6 of feeding pipe and the arc baffle 20-7 to form the triangular prismatic feeding pipe. The two sides of the lower end of the feeding pipe directly abuts against the two sides of the triangle on the plane 14-1 of the coal falling area of the coal discharge outlet 16. Two sealing plates 23 are arranged on both sides of the coal discharge outlet on the plane 14-1 of the coal falling area. Through the sealing plates 23 and the triangular straight section 20-6 of feeding pipe of the coal blockage-proof feeding pipe 20, the feeding area plane 14-1 and the coal discharge outlet 16 are separated within a guide chute 10, ensuring that all the falling coal is concentrated onto a triangular inlet 16-2 before being discharged, thereby preventing the falling coal from accumulating on the feeding area plane 14-1 and eliminating accumulated coal on the plane 14-1 of the coal falling area. Using the coal blockage-proof feeding pipe 20 designed in this scheme, coal entering from the central telescopic feeding pipe of the Eurosilo to the bottom coal falling area would not accumulate on the plane 14-1 of coal falling area but directly fall onto the coal discharge outlet 16 and then enter the Eurosilo through this outlet. Through the special structure of the coal blockage-proof feeding pipe 20 (the inclined section 20-4 of the coal feeding pipe, the triangular straight-section 20-6 of feeding pipe, and the arc baffle 20-7 feature smooth surfaces, and an angle between the inclined surface and the horizontal plane greater than) 70°, even for highly viscous coal, it cannot accumulate in the bottom guide chute 10 of the central telescopic feeding pipe 6 of the Eurosilo, effectively improving the capacity of the Eurosilo to handle viscous coal. In practical applications, the triangular straight section 20-6 of feeding pipe and the inclined section 20-4 of feeding pipe can be designed using wear-resistant materials or internally equipped with wear-resistant support plates (such as ceramics or wear-resistant steel plates) to further enhance a service life of the coal blockage-proof feeding pipe 20.

[0060] In summary, the present scheme can reduce various jamming and coal blockage failures of the central telescopic feeding pipe 6 caused by wet and sticky coal, minimizing severe consequences resulting from the inability of the Eurosilo to store coal normally. It also integrates functions of coal blockage detection, dust-laden gas exhaust, and prevention of coal accumulation at the coal falling point.

[0061] It will be apparent to those skilled in the art that various modifications and variations can be made to the disclosed embodiments without departing from the scope or spirit of the disclosure. In view of the foregoing, it is intended that the disclosure covers modifications and variations provided that they fall within the scope of the following claims and their equivalents.

Examples

embodiments

[0049]As shown in FIG. 5, an existing central feeding pipe 6 of the Eurosilo is composed of several concentrically nested round pipes with different diameters. Two adjacent round pipes can drag each other, forming a telescopic feeding pipe apparatus with a group of round pipes. When coal adheres to pipe walls or gaps 15 among nested and overlapped pipe walls, the adhered coal hinders a normal sliding movement among the round pipes. Since lower ends of the group of overlapped round pipes are close to a coal falling point, and the coal falling point of the Eurosilo adopts a method of reducing an impact force of coal on a bearing surface through accumulated coal, it is easy to cause a lower end of the telescopic feeding pipe to directly contact the accumulated coal, leading to occurrence of various failures. In addition, a structure of the existing coal falling point of the Eurosilo makes it difficult for personnel to enter and handle the situation.

[0050]Once the central feeding pipe i...

Claims

1. A coal blockage-proof feeding pipe apparatus for a coal storage Eurosilo, comprising a central telescopic feeding pipe, a coal blockage-proof feeding pipe, and a feeding pipe mounting base connected in sequence, wherein a middle part of a first section of round pipes of the central telescopic feeding pipe is of a conical pipe structure with a smaller upper part and a larger lower part; the first section of round pipes is connected to an upper end of the coal blockage-proof feeding pipe; a dust return plate is arranged inside the coal blockage-proof feeding pipe to guide dust-laden gas, generated at a coal falling point below and ascending along a pipe wall, downward, preventing the dust-laden gas from ascending along a cylinder wall into gaps among round pipe walls of the central telescopic feeding pipe; and the coal blockage-proof feeding pipe is provided with an exhaust port to discharge the internal dust-laden gas to the outside of the coal blockage-proof feeding pipe.

2. The coal blockage-proof feeding pipe apparatus for a coal storage Eurosilo according to claim 1, wherein the coal blockage-proof feeding pipe comprises a flange interface, a straight section of the feeding pipe, an inclined section of the feeding pipe, and a triangular straight section of the feeding pipe connected in sequence, wherein the flange interface is connected to a lower port of the first section of round pipes, the dust return plate is arranged at a connection position of the straight section of the feeding pipe and the flange interface, and the exhaust port is opened on an upper end pipe wall of the straight section of the feeding pipe.

3. The coal blockage-proof feeding pipe apparatus for a coal storage Eurosilo according to claim 2, wherein a periphery of the exhaust port is provided with a gas collection ring for collecting the dust-laden gas, the gas collection ring is connected to a gas guide pipe, and the gas guide pipe is configured to guide the collected dust-laden gas to a coal accumulation area below.

4. The coal blockage-proof feeding pipe apparatus for a coal storage Eurosilo according to claim 3, wherein a dust removal device or an exhaust fan is installed at an outlet position of the gas guide pipe to accelerate the discharge of the dust-laden gas.

5. The coal blockage-proof feeding pipe apparatus for a coal storage Eurosilo according to claim 2, wherein a blockage sensor mounting base is arranged at a lower end of the straight section of the feeding pipe for installing and connecting a blockage sensor, the blockage sensor is configured to detect a coal accumulation state inside a feeding pipe apparatus, and a sensor shield is arranged on the blockage sensor mounting base to protect the blockage sensor from being impacted and damaged by falling coal.

6. The coal blockage-proof feeding pipe apparatus for a coal storage Eurosilo according to claim 2, wherein an inspection door that is capable of being opened and closed is opened on a wall surface of the inclined section of the feeding pipe to facilitate inspection and maintenance for a user.

7. The coal blockage-proof feeding pipe apparatus for a coal storage Eurosilo according to claim 2, wherein a lower end of the inclined section of the feeding pipe is provided with a horizontal reinforcement rib and a fixed mounting surface, the fixed mounting surface is connected to the feeding pipe mounting base through a rubber buffer and a guide rod.

8. The coal blockage-proof feeding pipe apparatus for a coal storage Eurosilo according to claim 2, wherein an upper end of the triangular straight section of the feeding pipe is provided with an arc-shaped baffle to form a triangular prism-shaped feeding pipe; two edges at a lower end of the triangular straight section of the feeding pipe directly abuts against two edges of a triangular shape on the feeding area plane of a coal discharge outlet; two sealing plates are arranged on both sides of a feeding opening on the feeding area plane; and through the sealing plates and the triangular straight section of feeding pipe, the feeding area plane and the coal discharge outlet are separated within a guide chute, ensuring that all the falling coal is concentrated onto a triangular inlet before being discharged to prevent the falling coal from accumulating on the feeding area plane.

9. The coal blockage-proof feeding pipe apparatus for a coal storage Eurosilo according to claim 2, wherein an upper port of the first section of round pipes is a sealing ring, which is configured to seal a gap between the first section of round pipes and a second section of round pipes at the upper port of the first section of round pipes, and to ensure an up and down sliding movement of the second section of round pipes relative to the first section of round pipes; the lower port of the first section of round pipes is a flange interface of the first section of round pipes, which is configured to connect and fix with a flange interface of the coal blockage-proof feeding pipe.

10. The coal blockage-proof feeding pipe apparatus for a coal storage Eurosilo according to claim 9, wherein the sealing ring is made of rubber or polyurethane materials.

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