Novel efficient dust suppression fuel conveying device and method

Abstract

The invention relates to the technical field of thermal power plant fuel conveying equipment, in particular to a novel efficient dust suppression fuel conveying device and method.The device comprises a conveying frame, a first rotating roller, a second rotating roller and a net-shaped belt, and the first rotating roller is arranged at one end of the conveying frame; the second rotating roller is arranged at the other end of the conveying frame; the first rotating roller and the second rotating roller are sleeved with the net-shaped belt, the net-shaped belt is provided with leakage holes, and the net-shaped belt can screen fuel in the fuel conveying process. In the fuel conveying process, the net-shaped belt is periodically jacked up by the cam structure, so that a powder and particle mixture vibrates frequently, and separation of particles and powder is promoted. The sealing cover seals the whole conveying process, and dust leakage is reduced. The centrifugal fan extracts pulverized coal from the discharge port through the flow guide cover and the pipeline to provide fuel for the combustion chamber. Separation of particle powder is completed in the fuel conveying process through the net-shaped belt, and special screening equipment is omitted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fuel conveying equipment for thermal power plants, and in particular to a novel fuel conveying device and method with high dust suppression efficiency. BACKGROUND

[0002] With the rapid development of the power industry, as one of the main sources of electricity supply, the efficiency and environmental protection of the fuel conveying system of thermal power plants are increasingly valued. However, in the existing fuel conveying device for thermal power plants, there are generally defects such as the need for pre-screening of coal powder and a large amount of dust in the conveying process.

[0003] Coal powder screening requirement: In the existing fuel conveying device for thermal power plants, it is usually necessary to pre-screen the coal powder to remove impurities and particles that do not meet the combustion requirements. This step not only increases the complexity and cost of fuel processing, but also reduces the utilization rate of fuel.

[0004] Large amount of dust in the conveying process: During the fuel conveying process, due to factors such as particle size, humidity, and wind speed of the coal powder, a large amount of dust is easily generated. These dusts not only cause environmental pollution, but also cause damage to the equipment and workers of the thermal power plant.

[0005] For example, dust will adhere to the surface of the equipment, affecting the normal operation of the equipment; at the same time, workers exposed to a dust environment for a long time are also prone to suffer from occupational diseases such as pneumoconiosis.

[0006] Therefore, there is an urgent need for a novel fuel conveying device for thermal power plants to provide an effective solution to the defects of the prior art. SUMMARY

[0007] The present application provides a novel fuel conveying device and method with high dust suppression efficiency to solve the problem that in the prior art, fuel usually needs to be pre-screened before being conveyed to the combustion chamber to remove impurities and particles that do not meet the combustion requirements. This step not only increases the complexity and cost of fuel processing, but also reduces the utilization rate of fuel.

[0008] In one aspect, the present application provides a novel fuel conveying device with high dust suppression efficiency, comprising:

[0009] a conveying frame;

[0010] a first rotating roller arranged at one end of the conveying frame;

[0011] a second rotating roller arranged at the other end of the conveying frame;

[0012] a mesh belt sleeved on the first rotating roller and the second rotating roller, the mesh belt having perforations, and the mesh belt being capable of screening fuel during the conveying of fuel.

[0013] In a possible design, the device further comprises a sealing cover, the sealing cover surrounds the mesh belt, the sealing cover is provided with an inlet corresponding to the position of the first rotating roller, and the sealing cover is provided with an outlet and a slag outlet corresponding to the position of the second rotating roller.

[0014] In a possible design, the device further comprises a slag guide plate, the slag guide plate is arranged at the slag outlet, one end of the slag guide plate is arranged in the sealing cover and located below the second rotating roller, and the other end of the slag guide plate extends from the slag outlet to outside the sealing cover.

[0015] In a possible design, a dustproof curtain is further arranged at the slag outlet.

[0016] In a possible design, the device further comprises a plurality of supporting rollers, the supporting rollers are arranged on the conveying frame and located between the first rotating roller and the second rotating roller, and the supporting rollers are used for supporting the upper belt surface of the mesh belt.

[0017] In a possible design, the two opposite ends of the supporting roller are respectively formed with an increasing section, and the diameter of the increasing section gradually increases in the direction close to the end of the supporting roller.

[0018] In a possible design, the radial section of the increasing section is in a cam structure.

[0019] In a possible design, the device further comprises a material blocking plate, the material blocking plate is arranged on the conveying frame and located around the upper belt surface of the mesh belt.

[0020] In a possible design, the device further comprises:

[0021] a flow guide cover arranged at the outlet, one end of the flow guide cover being in communication with the inside of the sealing cover;

[0022] a centrifugal fan, an air inlet of the centrifugal fan being in communication with the other end of the flow guide cover, and an air outlet of the centrifugal fan being in communication with the combustion chamber through a pipeline.

[0023] On the other hand, the application further provides a novel fuel transmission method with high dust suppression efficiency, which adopts the novel fuel transmission device with high dust suppression efficiency as described above, and the method comprises the following steps:

[0024] The pulverized coal powder particle mixture is sent to the mesh belt, the coal powder with smaller particles passes through the leakage hole of the mesh belt and falls into the sealing cover and is discharged from the outlet to become fuel;

[0025] The coal particles with larger particles are conveyed by the mesh belt to the slag outlet and discharged, and are sent to the mesh belt again after being pulverized again.

[0026] The application has the following beneficial effects:

[0027] 1、In the application, the rotating sleeve of the supporting roller is passively rotated under the driving of the mesh belt, and the cam-like structure of the rotating sleeve in the process periodically lifts the mesh belt to make the powder particle mixture vibrate frequently, thereby promoting the separation of particles and powder. The sealing cover seals the whole transmission process to reduce dust leakage. The centrifugal fan extracts the pulverized coal from the discharge port through the flow guide cover and the pipeline to provide fuel for the combustion chamber. The separation of particles and powder is completed during the fuel transmission process by the mesh belt, and a special screening device is not needed.

[0028] 2、In the application, under the action of the centrifugal fan, a slight negative pressure is formed in the sealing cover, which can accelerate the movement of qualified coal powder to the discharge port and prevent the coal powder from spreading outward. The cooperation of the sealing cover and the centrifugal fan effectively reduces the risk of dust leakage, reduces environmental pollution, and protects the health of equipment and workers.

[0029] 3、In the application, when the coal particles discharged from the deslagging port are crushed again, they are re-fed into the feed hopper for secondary transmission and screening. The repeated crushing and screening ensure the quality of the fuel, improve the combustion efficiency, reduce the emission of pollutants, enhance the flexibility and reliability of the fuel handling system, and improve the fuel utilization rate and combustion efficiency. By adjusting the power of the centrifugal fan, the supply rate of the fuel can be adjusted.

[0030] The novel high-efficiency dust-suppression fuel transmission method provided by the application simultaneously contains all the advantages of the novel high-efficiency dust-suppression fuel transmission device as described above, because the novel high-efficiency dust-suppression fuel transmission device is used. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings described below are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0032] Figure 1 It is a structural schematic diagram of the novel high-efficiency dust-suppression fuel transmission device of the application.

[0033] Figure 2 It is a structural schematic diagram of the novel high-efficiency dust-suppression fuel transmission device of the application.

[0034] Figure 3 It is a structural schematic diagram of the conveying frame, the rotating roller and the supporting roller.

[0035] Figure 4 It is a structural schematic diagram of the supporting roller.

[0036] Figure 5 is a sectional view of the supporting roller;

[0037] Figure 6 is a front view of the supporting roller;

[0038] Figure 7 is a structural schematic view of the centrifugal fan and the fairing;

[0039] Figure 8 is a structural schematic view of the right end of the sealing cover;

[0040] Figure 9 is a structural schematic view of the inside of the sealing cover.

[0041] Reference signs:

[0042] 1, sealing cover; 2, feeding port; 3, slag discharging port; 4, dustproof curtain; 5, slope; 6, discharging port; 7, fairing; 8, centrifugal fan; 9, air inlet; 10, air outlet; 11, slag guide plate; 12, driving motor; 131, first rotating roller; 132, second rotating roller; 14, mesh belt; 15, supporting roller; 16, gradually increasing section; 18, conveying frame; 19, rubber layer; 20, feeding hopper. DETAILED DESCRIPTION

[0043] The technical solutions of the present application will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0044] The novel high-efficiency dust-suppression fuel conveying device provided in the embodiments of the present application will be described below in conjunction with Figures 1-9 .

[0045] Referring to Figure 1 , Figure 2 , the novel high-efficiency dust-suppression fuel conveying device provided in the embodiments of the present application comprises a conveying frame 18, a first rotating roller 131, a second rotating roller 132 and a mesh belt 14. The first rotating roller 131 is rotatably installed at the left end of the conveying frame 18, and the second rotating roller 132 is rotatably installed at the right end of the conveying frame 18. The mesh belt 14 is jointly sleeved on the first rotating roller 131 and the second rotating roller 132, and the mesh belt 14 has perforations and can screen fuel during conveying of the fuel. In this way, the separation of particulate powder is completed during the fuel conveying process by the mesh belt 14, and a special screening device is saved.

[0046] Referring to Figure 9As shown in some embodiments of the present application, the device further comprises a sealing cover 1 surrounding the mesh belt 14, and the sealing cover 1 is fixed to the outer side of the conveying frame. The sealing cover 1 is provided with an inlet 2 corresponding to the position of the first rotating roller 131, and a feeding hopper 20 is installed at the inlet 2. The sealing cover 1 is provided with an outlet 6 and a slag outlet corresponding to the position of the second rotating roller 132. In this way, the sealing cover 1 encloses the entire transmission process, reducing dust leakage.

[0047] Referring to Figure 2 , Figure 8 As shown in some embodiments of the present application, the device further comprises a slag guide plate 11 arranged at the slag outlet, one end of the slag guide plate 11 being arranged inside the sealing cover 1 below the second rotating roller 132, and the other end of the slag guide plate 11 extending obliquely downward from the slag outlet to the outside of the sealing cover 1. The slag guide plate 11 is used to guide the fuel on the mesh belt 14 out.

[0048] In order to reduce dust, a dustproof curtain 4 is further arranged above the slag guide plate 11 at the slag outlet.

[0049] Referring to Figure 2 As shown in some embodiments of the present application, the device further comprises a plurality of support rollers 15 rotatably arranged on the conveying frame 18 at intervals, and the support rollers 15 are arranged between the first rotating roller 131 and the second rotating roller 132 to support the upper surface of the mesh belt 14. In this way, the support rollers 15 can provide support for the mesh belt 14 to prevent the mesh belt 14 from being deformed by the fuel.

[0050] Referring to Figure 4 , Figure 5 , Figure 6 As shown in some embodiments of the present application, opposite ends of the support roller 15 are respectively formed with gradually increasing sections 16, and the diameter of the gradually increasing section 16 gradually increases in the direction close to the end of the support roller 15. By arranging the gradually increasing section 16, the height of the two sides of the mesh belt 14 can be raised to prevent the material from falling off the two sides of the mesh belt 14.

[0051] Referring to Figure 6 As shown in some embodiments of the present application, in one possible design, the radial cross section of the gradually increasing section 16 is in the form of a cam structure. During the rotation of the support roller 15, the cam structure periodically lifts the mesh belt 14, causing the powder particle mixture to vibrate frequently, thereby promoting the separation of particles and powder.

[0052] Specifically, the outer surface of the support roller 15 is provided with a rubber layer 19 and a resistance increasing pattern, which can increase the friction between the mesh belt 14 and the support roller 15 to prevent the mesh belt 14 from slipping.

[0053] Referring to Figure 3As shown, in some embodiments of the present application, the device further comprises a material blocking plate, which is arranged on the conveying frame 18 and located around the upper belt surface of the mesh belt 14. This prevents the material from falling off the two sides of the mesh belt 14.

[0054] Referring to Figure 7 As shown, in some embodiments of the present application, the device further comprises a guide hood 7 and a centrifugal fan 8. The guide hood 7 is arranged at the discharge port 6, one end of the guide hood 7 is in communication with the inside of the sealing cover 1, and the other end of the guide hood 7 is in communication with the air inlet 9 of the centrifugal fan 8, and the air outlet 10 of the centrifugal fan 8 is in communication with the combustion chamber through a pipeline. The centrifugal fan 8 extracts the pulverized coal from the discharge port 6 through the guide hood 7 to provide fuel to the combustion chamber.

[0055] Working principle of the novel high-efficiency dust-suppression fuel conveying device of the present application:

[0056] When working, the fuel enters the feed inlet 2 through the feed hopper 20 and falls on the mesh belt 14. The first rotating roller 131 is driven to rotate by the driving motor 12, which drives the mesh belt 14 to move forward. The supporting rollers 15 are distributed on the conveying frame 18 to provide support for the mesh belt 14. The supporting rollers 15 are passively rotated under the drive of the mesh belt 14. During the rotation process, the cam structure at the end of the supporting roller 15 periodically lifts the mesh belt 14 upward, causing the powder and particle mixture to vibrate frequently and promoting the separation of particles and powder. At the same time, the rubber layer 19 and the resistance-increasing pattern on the supporting roller 15 increase the friction between the mesh belt 14 and the supporting roller 15, preventing the mesh belt 14 from slipping.

[0057] During the conveying process, the pulverized coal that meets the combustion requirements falls through the mesh holes of the mesh belt 14 due to gravity and falls into the bottom of the sealing cover 1. The bottom of the sealing cover 1 is designed as a left-high right-low slope 5, which allows impurities and particles to naturally slide to the right. The granular coal particles that do not meet the requirements are smoothly discharged from the slag discharge port 3. The dust curtain 4 prevents dust from overflowing from the slag discharge port 3. The gradually increasing sections 16 at the front and rear ends of the rotating sleeve gradually expand outward in diameter, which can raise the height of the two sides of the mesh belt 14 to prevent the material from falling off the two sides of the mesh belt 14.

[0058] The sealing cover 1 encloses the entire conveying process, reducing dust leakage. The centrifugal fan 8 extracts the pulverized coal from the discharge port 6 through the guide hood 7 to provide fuel to the combustion chamber. Under the action of the centrifugal fan 8, a slight negative pressure is formed inside the sealing cover 1, which can accelerate the movement of qualified pulverized coal to the discharge port 6 and prevent the pulverized coal from spreading outward.

[0059] The mesh belt 14 separates the granular powder during fuel transmission, eliminating the need for a separate screening device, removing impurities and non-compliant particles from the fuel, and improving the purity and combustion efficiency of the fuel. The design of the sealing cover 1 and the dust curtain 4 effectively prevents dust leakage, reduces environmental pollution, and protects the health of the equipment and workers. The device realizes automatic screening and transmission of fuel, reducing the complexity and labor intensity of manual operation.

[0060] In another aspect, the application also provides a new and efficient dust suppression fuel transmission method, which uses the new and efficient dust suppression fuel transmission device as described above. The method comprises:

[0061] The crushed coal powder mixture is sent to the mesh belt 14, and the smaller coal powder particles pass through the mesh belt 14 and fall into the sealing cover 1, then discharged from the discharge port 6 to become fuel;

[0062] The larger coal particles are transported by the mesh belt 14 to the slag discharge port 3 and discharged, and then re-sent to the mesh belt 14 after being crushed again.

[0063] When the coal particles discharged from the slag discharge port 3 are crushed again, they are re-fed into the feed hopper 20 for secondary transmission and screening. The repeated crushing and screening ensure the quality of the fuel, improve the combustion efficiency, reduce pollutant emissions, enhance the flexibility and reliability of the fuel handling system, and improve the fuel utilization rate and combustion efficiency. The power of the centrifugal fan 8 can be adjusted to adjust the fuel supply rate.

[0064] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0065] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0066] In this application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection or communication with each other; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0067] In this application, the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0068] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A novel, high-efficiency dust-suppressing fuel transfer device, characterized in that, include: Conveyor rack; The first roller is disposed at one end of the conveyor frame; The second roller is located at the other end of the conveyor frame; A mesh belt is fitted onto the first and second rotating rollers. The mesh belt has perforations and is capable of screening fuel during the fuel conveying process.

2. The novel high-efficiency dust-suppressing fuel transfer device according to claim 1, characterized in that: It also includes a sealing cover, which surrounds the mesh belt. The sealing cover has a feed inlet corresponding to the position of the first rotating roller, and a discharge outlet and a slag outlet corresponding to the position of the second rotating roller.

3. The novel high-efficiency dust-suppressing fuel transfer device according to claim 2, characterized in that: It also includes a slag guide plate, which is disposed at the slag outlet. One end of the slag guide plate is disposed inside the sealing cover and below the second rotating roller, and the other end of the slag guide plate extends from the slag outlet to the outside of the sealing cover.

4. The novel high-efficiency dust-suppressing fuel transfer device according to claim 3, characterized in that: A dustproof curtain is also installed at the slag outlet.

5. The novel high-efficiency dust suppression fuel transfer device according to any one of claims 1-4, characterized in that: It also includes support rollers, a plurality of which are spaced apart on the conveyor frame, located between the first rotating roller and the second rotating roller, for supporting the upper surface of the mesh belt.

6. The novel high-efficiency dust-suppressing fuel transfer device according to claim 5, characterized in that: The support roller has gradually increasing sections at its two opposite ends, and the diameter of the gradually increasing sections gradually increases in the direction near the end of the support roller.

7. The novel high-efficiency dust-suppressing fuel transfer device according to claim 6, characterized in that: The radial cross-section of the gradually increasing section has a cam structure.

8. The novel high-efficiency dust-suppressing fuel transfer device according to claim 5, characterized in that: It also includes a baffle plate, which is disposed on the conveyor frame and located around the upper surface of the mesh belt.

9. The novel high-efficiency dust-suppressing fuel transfer device according to claim 5, characterized in that, Also includes: A flow guide is provided at the discharge port, with one end communicating with the interior of the sealing cover; A centrifugal fan, wherein the air inlet of the centrifugal fan is connected to the other end of the guide shroud, and the air outlet of the centrifugal fan is connected to the combustion chamber through a pipe.

10. A novel and highly efficient dust-suppressing fuel transport method, characterized in that: The method of using the novel high-efficiency dust suppression fuel transfer device according to any one of claims 1-9 includes: The pulverized coal powder mixture is fed onto a mesh belt. Smaller coal powder particles pass through the holes in the mesh belt, fall into the sealing cover, and are discharged from the outlet to become fuel. Larger coal particles are transported by a mesh belt to the slag discharge port and then crushed again before being sent back to the mesh belt.

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