Stokehole feeding system

Abstract

According to the stokehole feeding system, a rotary feeding valve comprises a valve body, and an impeller is arranged in a working cavity of the valve body; and a first cutter is arranged on a blade of the impeller. The utility model further comprises a stokehole feeding system comprising the rotary feeding valve. On one hand, the first cutters are arranged on the blades, and compared with the mode that the cutters are arranged at the positions of the feeding ports, the material crushing efficiency and the anti-blocking performance are higher; furthermore, a first cutter and a second cutter are combined, so that the materials can be crushed more effectively, and the materials can be effectively prevented from being blocked; and on the other hand, the shaft of the impeller is designed into the rotary eccentric shaft, so that the materials can be crushed more effectively, and the materials are prevented from being blocked.

Description

Technical Field

[0001] The utility model relates to a positive pressure feeding device, in particular to a feeding system in front of a furnace. Background Art

[0002] A rotary feeder valve is a special device used for discharging, metering, and quantitatively conveying materials in a material conveying system. Its working principle is that through the transmission of a motor and a speed reducer, an impeller with an equal division structure rotates in a housing. Materials from the upper hopper or feeding device of the housing are filled in the cavity of the impeller, and the materials are discharged from the lower part of the housing as the impeller rotates. It can discharge materials downstream evenly and continuously according to the requirements of the conveying system. And the rotary feeder valve operates under positive pressure during the feeding process to ensure that materials (such as biomass fuel) are continuously, stably, and reliably fed into a pressurized reaction device under positive pressure conditions.

[0003] CN 105692086A discloses a rotary feeder with grooves for protecting a baffle and a trimming assembly. A scraper is arranged at the inlet of the rotary feeder to crush the materials at the inlet. However, after the scraper is fixed at the inlet, it receives a passive force and can only passively crush the materials at the inlet, with a low crushing efficiency. And when the materials enter the working chamber of the rotary feeder, a jamming phenomenon is still likely to occur. In addition, the gap between the blades is prone to material jamming. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the above deficiencies of the prior art and provide a feeding system in front of a furnace with high crushing efficiency and preventing material jamming.

[0005] The technical solution of the utility model is: a feeding system in front of a furnace includes at least two rotary feeder valves, and sealing gas is introduced into each rotary feeder valve and between adjacent rotary feeder valves; the rotary feeder valve includes a valve body, and an impeller is arranged in the working chamber of the valve body; a first cutter is arranged on the blade of the impeller; a second cutter is arranged at the feed port end of the valve body; the shaft in the valve body adopts a rotary eccentric shaft, and when the first cutter on the blade approaches the second cutter at the feed port end during rotation, a V-shaped scissor structure is formed.

[0006] Further, the first cutter is arranged at the edge position and / or the surface of the blade; the length of the first cutter is less than or equal to the length of the blade.

[0007] Further, when the first cutter is arranged at the edge of the blade, the thickness of the blade gradually thins towards the edge direction to form a blade structure; or the first cutter is additionally arranged at the edge of the blade; when the first cutter is arranged on the surface of the blade, the first cutter is welded to the surface of the blade and is arranged at an angle with the surface of the blade.

[0008] Further, the shaft in the valve body is a rotary eccentric shaft, and the eccentric angle is 1-8°.

[0009] Further, the blades of the impeller are arc-connected between the blades.

[0010] Further, sealed gas inlets communicating with the working chamber are provided on the outer shell of the valve body and below the feed inlet of the valve body, and sealed gas is input into the working chamber through an external pipeline.

[0011] Advantages of the utility model:

[0012] (1) By arranging the first cutter on the blade, compared with arranging the cutter at the feed inlet position, the material crushing efficiency and anti-blocking performance are higher;

[0013] (2) By combining the first cutter and the second cutter, the material can be more effectively crushed and the material jamming can be effectively prevented;

[0014] (3) By directly integrally forming the first cutter with the blade to form a kitchen knife structure, the structure is simple and the crushing efficiency is high;

[0015] (4) By inputting sealed gas at the feed inlet position and the middle and lower parts of the valve body, the material can be blown into the center of the impeller, thereby preventing it from being blown into the end face of the impeller, effectively preventing the jamming of the rotary feeder valve, and helping to minimize the leakage of process gas or air through the gap of the rotary feeder valve;

[0016] (5) By designing the shaft of the impeller as a rotary eccentric shaft, it is convenient for the first cutter to better crush, and it can also form a "scissor" structure with the second cutter at the feed inlet end, further realizing the crushing of the material and preventing the material from jamming;

[0017] (6) By arc-connecting the blades of the impeller, material jamming can be further prevented. Description of the drawings

[0018] Figure 1 is a schematic structural diagram of Embodiments 1 and 3 of the utility model;

[0019] Figure 2 is a schematic structural diagram of the sealed gas inlet of Embodiment 1 of the utility model;

[0020] Figure 3 is a simple schematic diagram of the arc connection between the blades of Embodiment 1 of the utility model;

[0021] Figure 4 is a schematic diagram of the eccentric angle of the rotary eccentric shaft of Embodiment 2 of the utility model;

[0022] Figure 5It is a schematic structural diagram of Embodiment 4 of the present utility model;

[0023] Figure 6 It is a schematic structural diagram of Embodiment 6 of the present utility model.

[0024] Explanation of the attached drawing reference numerals:

[0025] 1. Valve body; 2. Impeller; 3. First cutter; 4. Arc plate; 5. Second cutter; 6. Silo; 7. Buffer bin; 8. Metering screw conveyor; 9. Pneumatic slide gate valve; 10. Pushing screw conveyor; 11. Sealed air inlet; 12. External pipeline; 13. Feed inlet; 21. Blade; 22. Shaft. Detailed implementation manners

[0026] The following will further describe the present utility model in detail with reference to the specification drawings and specific embodiments.

[0027] Embodiment 1

[0028] As Figure 1 and Figure 2 shown: A rotary feeder includes a valve body 1, and an impeller 2 is arranged in the working cavity of the valve body 1; a first cutter 3 is arranged on each blade 21 of the impeller 2.

[0029] Specifically, the number of blades in this embodiment can be 4 to 8, preferably 5 or 6. Each blade is connected to a shaft 22, and the blade is preferably designed in a planar structure. The first cutter 3 is arranged at the outer edge of the blade, that is: the blade 21 is designed in the style of a kitchen knife, and the thickness of the blade gradually thins towards the end far from the connection with the shaft, forming a knife shape, which is equivalent to the first cutter being integrally formed with the blade, so as to realize the cutting or crushing of the fuel.

[0030] It can be understood that in this embodiment, a first cutter can also be additionally arranged at the edge of the blade. For example, the first cutter is welded to the edge of the blade. The length of the first cutter can be the same as the length of the blade, or less than the length of the blade, or multiple first cutters are arranged at intervals at the edge of the blade.

[0031] This embodiment has the following advantages by arranging the first cutter 3 on the blade 21: The impeller rotates to make the first cutter on the blade obtain power. Compared with arranging the cutter at the feed inlet position, the material crushing efficiency and anti-blocking performance are higher, because the cutter on the blade obtains the driving force under the rotation of the impeller, while the cutter arranged at the feed inlet 13 obtains the driven force. Therefore, the crushing speed is greatly improved. It can be said that this embodiment can enable large-sized materials (such as biomass fuel) to be crushed or sheared after passing through the rotary feeder, effectively preventing the jamming of the rotary feeder.

[0032] It is understandable that the first cutter 3 is provided on each blade 21, or is staggeredly arranged. For example, among 6 blades, the first cutter is provided on every other three blades, and not provided on other blades. Of course, in order to improve the crushing efficiency, the cutter is preferably provided on each blade.

[0033] As Figure 3 shown: In this embodiment, the adjacent blades 21 are arranged at intervals. In order to prevent materials from getting stuck between adjacent blades, in this embodiment, an arc-shaped plate 4 is welded between adjacent blades to connect the adjacent blades together to prevent material jamming. One end of the arc-shaped plate is welded to the surface of one blade, and the other end is welded to the surface of the other blade.

[0034] In this embodiment, sealing gas inlets 11 communicating with the working chamber are provided on both sides of the middle or lower part of the outer shell of the valve body 1, and below the feed inlet of the valve body. The sealing gas inlets 11 are provided with flanges and are flange-connected to the external pipeline 12, and sealing gas is conveyed into the working chamber through the external pipeline 12 to help minimize the leakage of process gas or air through the clearance of the rotary feeder valve. The sealing gas inlet located below the feed inlet corresponds directly to the position of the feed inlet 13 because when the material just enters, there will be a stream of air hindering the material from flowing down along the impeller. The structure of this embodiment can blow the material into the center of the impeller, thus preventing it from being blown towards the end face of the impeller and effectively preventing the jamming of the rotary feeder valve. Furthermore, by introducing sealing gas into the middle or lower part of the working chamber and also introducing sealing gas at the upper feed inlet position, it can not only prevent jamming but also improve the sealing performance and prevent gas leakage.

[0035] Embodiment 2

[0036] As Figure 4 shown: On the basis of Embodiment 1, the shaft 22 of the impeller in this embodiment adopts a rotary eccentric shaft, and the formed eccentric angle is 1-8°. That is, the shaft 22 is inclined, and the inclination angle is 1-8°, preferably 2-6°, and more preferably 3-6°. The reason for designing the shaft as an eccentric shaft in this embodiment is to make the blades form a certain inclination angle, so that the first cutter on the blades can better cut or crush the materials, and it can also prevent the jamming of the rotary feeder valve. The reason for designing the eccentric angle as 1-8° is that on the one hand, it is for the first cutter to cut or crush better, and on the other hand, it can ensure the rotational stability of the impeller, prevent excessive eccentricity from causing shaking, and prevent too small eccentricity from reducing the crushing effect of the first cutter.

[0037] Embodiment 3

[0038] As Figure 1 shown: On the basis of Embodiment 2, this embodiment also provides a second cutter 5 at the feed inlet end of the valve body.

[0039] There can be various installation structures for the second cutter 5 in this embodiment. For example, a long strip of the second cutter 5 is horizontally arranged below the feed inlet, or multiple second cutters are horizontally arranged at intervals; or the second cutter is longitudinally arranged on the side below the feed inlet. The second cutter is welded or thread - connected to the inner wall of the working chamber, or a second cutter mounting frame is arranged on the inner wall, and the second cutter is connected to the mounting frame. By setting the second cutter 5 in this embodiment, the material at the feed inlet can be crushed to prevent jamming. Through the first cutter 3, the main power can be obtained during the rotation of the impeller 2 to cut the material, thus greatly improving the crushing efficiency. Therefore, the combination of the two can not only achieve material crushing but also prevent material jamming.

[0040] In this embodiment, it is preferably to horizontally arrange a long strip of the second cutter 5 below the feed inlet. Since the shaft 22 of the impeller adopts a rotary eccentric shaft, the first cutter is also inclined. When the first cutter approaches the second cutter at the end near the feed inlet during rotation, a V - shaped scissor - like structure will be formed with the second cutter, thus more effectively realizing the crushing of the material and effectively preventing material jamming. Among them, this V - shaped scissor - like structure is not that the first cutter intersects with the second cutter, but is similar in shape to a V - shaped scissor - like structure, and there is a gap between the two.

[0041] Embodiment 4

[0042] As Figure 5 shown: The difference from Embodiment 1 is that the first cutter 3 in this embodiment is not arranged on the edge of the blade, but on the surface of the blade 21, that is, the first cutter 3 is arranged on the blade 21. The root of the first cutter 3 is welded to the surface of the blade 21, and the tip is used to crush the material. And the first cutter 3 forms an angle with the blade 21, preferably 20° - 75°, for better crushing.

[0043] Embodiment 5

[0044] The first cutter in this embodiment includes both the cutter arranged on the edge of the blade in Embodiment 1 and the cutter arranged on the surface of the blade in Embodiment 4, further improving the crushing effect.

[0045] Embodiment 6

[0046] As Figure 6 shown: A feeding system in front of the furnace includes a bin 6, a buffer bin 7, a metering screw conveyor 8, a rotary feeder, a pneumatic slide gate valve 9, and a pusher screw conveyor 10 connected in sequence from top to bottom; the number of the rotary feeders is at least two, and the output end of the pusher screw conveyor is connected to a pressurized reaction device; the pressure of the feeding system in front of the furnace is greater than the pressure in the pressurized reaction device. The pressurized reaction device is preferably a gasifier. The rotary feeder adopts any one of the structures in Embodiments 1 - 5.

[0047] The number of rotary feeder valves is preferably designed to be two. If a higher pressure, such as above 50 kPag, is to be achieved, the number can be increased to three or more rotary feeder valves.

[0048] Each rotary feeder valve has a pressurizing function, and sealing gas is conveyed between each rotary feeder valve and adjacent rotary feeder valves. By adjusting and controlling the pressure of the sealing gas, the high-temperature gas with different pressures generated in the gasifier can be effectively prevented from flowing back to the front-of-furnace feeding system.

[0049] The working principle of this embodiment is as follows: The biomass fuel is placed in the silo 6. The silo 6 is an atmospheric-pressure silo. After the fuel is broken and mixed in the silo 6, it smoothly enters the buffer silo 7. The buffer silo 7 serves as a buffer storage for the fuel to ensure that the metering screw conveyor connected to the buffer silo can achieve uniform, continuous, and stable conveying. The buffered fuel enters the metering screw conveyor 8, and the metering screw conveyor 8 adjusts the fuel input amount in real time to ensure uniform, continuous, and stable feeding to the rotary feeder valve; when the fuel enters the first rotary feeder valve, it will be broken under the action of the cutter in the valve. Sealing gas, such as nitrogen, is input into the inner cavity of each rotary feeder valve and between adjacent rotary feeder valves. The two rotary feeder valves are always in a positive pressure state to ensure that the biomass fuel is continuously, stably, and reliably fed into the gasifier under positive pressure conditions. Sealing gas is also input into the upper and lower parts of the valve body 1 to effectively prevent jamming of the rotary feeder valve; the fuel broken by the two rotary feeder valves then enters the pneumatic slide gate valve 9 and then into the pushing screw conveyor 10, and is then sent to the gasifier by the pushing screw conveyor 10, thus ensuring that the biomass fuel is continuously, stably, and reliably fed into the gasifier under positive pressure conditions; at the same time, during the working process, sealing gas, such as nitrogen, is introduced between the pneumatic slide gate valve 9 and the pushing screw conveyor 10 and into the cavity of the pushing screw conveyor 10 to prevent the high-temperature gas generated in the gasifier from flowing back to the feeding system.

[0050] It can be understood that this embodiment can also not be provided with the buffer silo 7, and the discharge port of the silo 6 is directly connected to the metering screw conveyor 8.

[0051] In summary, on the one hand, by providing the first cutter on the blade in the present utility model, compared with setting the cutter at the feeding port position, the material crushing efficiency and anti-blocking performance are higher; further, by combining the first cutter and the second cutter, the material can be more effectively crushed and the material jamming can be effectively prevented; on the other hand, by designing the shaft of the impeller as a rotary eccentric shaft, the material can be more effectively crushed and the material jamming can be prevented.

[0052] As described above, it is only the specific implementation manner of the present application. However, the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims described above.

Claims

1. A front-furnace feeding system, characterized in that It includes at least two rotary feeding valves, and sealing gas is introduced into each rotary feeding valve and between adjacent rotary feeding valves; the rotary feeding valve includes a valve body, and an impeller is arranged in the working cavity of the valve body; a first cutter is arranged on the blade of the impeller; a second cutter is arranged at the feed port end of the valve body; the shaft in the valve body adopts a rotary eccentric shaft, and when the first cutter on the blade approaches the second cutter at the feed port end during rotation, a V-shaped scissors structure is formed.

2. The front-of-furnace feeding system according to claim 1, wherein The first cutter is arranged at the edge position and / or on the surface of the blade; the length of the first cutter is less than or equal to the length of the blade.

3. The front-of-furnace feeding system according to claim 2, wherein When the first cutter is arranged at the edge of the blade, the thickness of the blade gradually thins towards the edge direction, forming a blade structure. Or the first cutter is additionally arranged at the edge of the blade; when the first cutter is arranged on the surface of the blade, the first cutter is welded to the surface of the blade and is arranged at an angle with the surface of the blade.

4. The front-of-furnace feeding system according to claim 1 or 2, characterized in that, The shaft in the valve body adopts a rotary eccentric shaft, and the eccentric angle is 1 to 8°.

5. The front-of-furnace feeding system according to claim 1, wherein, The blades of the impeller are connected in an arc shape between the blades.

6. The front-of-furnace feeding system according to claim 1, characterized in that, Sealing gas inlets communicating with the working cavity are arranged on the outer shell of the valve body and below the feed port of the valve body, and sealing gas is input into the working cavity through an external pipeline.

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