Device for crosswise conveying coal in thermal power plant

Abstract

The utility model discloses a device for crosswise conveying coal in a thermal power plant, and relates to the technical field of coal conveying, the device for crosswise conveying coal in the thermal power plant comprises a first coal bunker and a second coal bunker, the first coal bunker is provided with a first externally-hung coal bucket, and a coal outlet of the first externally-hung coal bucket is connected with a first long coal feeder; the first long coal feeder is connected with the first short coal feeder; the first short coal feeder is connected with a coal outlet of the second coal bunker; the second coal bunker is provided with a second externally-hung coal bucket; a coal outlet of the second externally-hung coal bucket is connected with the second long coal feeder; the second long coal feeder is connected with the second short coal feeder; and the second short coal feeder is connected with a coal outlet of the first coal bunker. According to the technical scheme, the technical problem that the coal conveying efficiency is low when a single coal bunker is matched with a single coal feeder for coal conveying can be solved.

Description

Technical Field

[0001] This utility model relates to the field of coal conveying technology, and in particular to a device for cross-coal conveying in a thermal power plant. Background Technology

[0002] When transporting coal in areas with high temperature, high humidity, and concentrated rainfall, the high moisture content of the coal can easily cause coal blockage. The existing coal conveying technology uses a single coal bunker paired with a single coal feeder. Because of the single coal drop point, each blockage takes about 30 to 60 minutes to clear, and a single clearing time can be as long as 4 hours. When the blockage is severe, 2 to 3 coal feeders may be blocked at the same time, resulting in low actual coal conveying efficiency.

[0003] Therefore, the coal conveying efficiency of a single coal bunker paired with a single coal feeder is low. Utility Model Content

[0004] The main purpose of this invention is to propose a device for cross-feeding in thermal power plants, which aims to solve the technical problem of low coal conveying efficiency when a single coal bunker is paired with a single coal feeder.

[0005] To achieve the above objectives, the present invention proposes a device for cross-feeding coal in a thermal power plant, comprising: a first coal bunker with a first external coal hopper; the outlet of the first external coal hopper being connected to a first long coal feeder; the first long coal feeder being connected to a first short coal feeder; the first short coal feeder being connected to the outlet of a second coal bunker; a second coal bunker with a second external coal hopper; the outlet of the second external coal hopper being connected to a second long coal feeder; the second long coal feeder being connected to a second short coal feeder; and the second short coal feeder being connected to the outlet of the first coal bunker.

[0006] In one embodiment, the first extended coal feeder and the second extended coal feeder have built-in conveyor belts, and the conveying speed is adjusted by the conveyor belts.

[0007] In one embodiment, the device for cross-feeding coal in the thermal power plant further includes: a first bidirectional pneumatic gate, a second bidirectional pneumatic gate, a third bidirectional pneumatic plug-in gate, and a fourth bidirectional pneumatic gate; the first external coal hopper is connected to the first long coal feeder through the first bidirectional pneumatic gate; the first long coal feeder is connected to the first short coal feeder through the second bidirectional pneumatic gate; the second external coal hopper is connected to the second long coal feeder through the third bidirectional pneumatic gate; and the second long coal feeder is connected to the second short coal feeder through the fourth bidirectional pneumatic gate.

[0008] In one embodiment, the first external coal hopper is connected to the first coal bunker via a first reinforcing clamp; the second external coal hopper is connected to the second coal bunker via a second reinforcing clamp.

[0009] In one embodiment, the unblocking machine comprises an upper chamber, a rotary assembly, and a lower chamber; the upper chamber is located at the upper end of the rotary assembly; the upper chamber is used to connect with the coal drop outlets of the first coal bunker, the second coal bunker, the first external coal hopper, and / or the second external coal hopper; the lower chamber is located at the lower end of the rotary assembly, and the lower chamber is used to connect with the first short coal feeder, the second short coal feeder, the first long coal feeder, and / or the second long coal feeder.

[0010] In one embodiment, the rotary assembly is provided with a three-dimensional variable cross-section rotary scraper and a gate valve; the three-dimensional variable cross-section rotary scraper is built into the rotary assembly, and the gate valve is disposed between the rotary assembly and the lower compartment.

[0011] In one embodiment, the three-dimensional variable cross-section rotary scraper moves on the conveyor belt of the coal feeder via the gate valve; the three-dimensional variable cross-section rotary scraper cleans the adhesive material along the walls of the upper bin and / or the lower bin under the drive of the rotary assembly.

[0012] In one embodiment, the first external coal hopper and the second external coal hopper are made of stainless steel, and the first external coal hopper and the second external coal hopper are each welded together from four sections of the hopper body.

[0013] In one embodiment, the weld obtained by welding the silo body is a continuous weld, the fillet weld height of the weld is not less than 10mm, and the butt weld penetration depth of the weld is not less than 10mm.

[0014] In this utility model, the device for cross-conveying coal in a thermal power plant includes a first coal bunker and a second coal bunker. The first coal bunker is equipped with a first external coal hopper, the outlet of which is connected to a first long coal feeder. The first long coal feeder is connected to a first short coal feeder. The first short coal feeder is connected to the outlet of the second coal bunker. The second coal bunker is equipped with a second external coal hopper. The outlet of the second external coal hopper is connected to a second long coal feeder. The second long coal feeder is connected to a second short coal feeder. The second short coal feeder is connected to the outlet of the first coal bunker. This utility model utilizes the first and second external coal hoppers for cross-conveying coal, thereby avoiding blockages caused by conveying coal from a single coal bunker. Furthermore, compared to existing coal conveying methods, this solution improves coal transfer efficiency within the coal bunker and achieves highly efficient coal conveying by utilizing extended coal feeders and connecting them to the coal bunker and external coal hoppers. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 A schematic diagram of an embodiment of the device for cross-coal conveying in a thermal power plant provided by this utility model;

[0017] Figure 2 A side view of an embodiment of the device for cross-coal conveying in a thermal power plant provided by this utility model;

[0018] Figure 3 A top view schematic diagram of the reinforced clamp structure in the device for cross-coal conveying in a thermal power plant provided by this utility model;

[0019] Figure 4 A side view of the reinforced clamp structure in the device for cross-coal conveying in a thermal power plant provided by this utility model;

[0020] Figure 5 A side view of the unblocking machine in the cross-coal conveying device for thermal power plants provided by this utility model;

[0021] Figure 6 A top view of the unblocking machine in the cross-coal conveying device for thermal power plants provided by this utility model;

[0022] Figure 7 Another structural schematic diagram of the unblocking machine in the device for cross-coal conveying in thermal power plants provided by this utility model;

[0023] Figure 8 A schematic diagram of the external coal hopper in the cross-coal conveying device provided by this utility model.

[0024] Explanation of icon numbers:

[0025]

[0026]

[0027] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0029] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0030] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] When transporting coal in areas with high temperature, high humidity, and concentrated rainfall, coal blockage is easily caused due to the high moisture content of the coal. Each blockage takes about 30 to 60 minutes to clear, and a single blockage can last up to 4 hours. In severe cases, 2 to 3 coal feeders may be blocked at the same time, which seriously affects the unit's load-bearing capacity, the safe and stable operation of the unit, and economic benefits.

[0032] Therefore, the coal conveying efficiency of a single coal bunker paired with a single coal feeder is low.

[0033] To address the aforementioned problems, this utility model proposes a device for cross-coal conveying in thermal power plants.

[0034] Reference Figure 1 , Figure 1This is a schematic diagram of an embodiment of the device for cross-coal conveying in a thermal power plant according to the present invention. In this embodiment, the device includes a first coal bunker 11 and a second coal bunker 21. The first coal bunker 11 is equipped with a first external coal hopper 14. The first external coal hopper 14 is connected to the second coal bunker 21 via a first long coal feeder 12 and a first short coal feeder 23. The second coal bunker 21 is equipped with a second external coal hopper 24. The second external coal hopper 24 is connected to the first coal bunker via a second long coal feeder 22 and a second short coal feeder 13. It should be noted that in this embodiment, the first extended coal feeder 12, the second extended coal feeder 22, and the first short coal feeder 23 are used. The second short coal feeder 13 enables cross-connection between the first coal bunker 11 and the second coal bunker 21. That is, a coal drop pipe is installed in each of the first coal bunker 11 and the second coal bunker 21 to transport raw coal to two newly added belt-type weighing coal feeders (i.e., the first long coal feeder 12 and the second extended coal feeder 22). The first extended coal feeder 12 transports the coal stored in the first coal bunker 11 to the entrance of the second coal bunker 21, and the second extended coal feeder 22 transports the coal stored in the second coal bunker 22 to the entrance of the second coal bunker 11, realizing cross-coal conveying. In addition, the first extended coal feeder 12 and the second extended coal feeder 22 have built-in conveyor belts, which can adjust the coal conveying speed and also have a weighing function.

[0035] This utility model's technical solution involves installing a first external coal hopper 14 in a first coal bunker 11, which is connected to a second coal bunker 21 via the first external coal hopper 14, a first extended coal feeder 12, and a first short coal feeder 23. A second external coal hopper 24 is installed in the second coal bunker 21, which is connected to the second coal bunker 11 via the second external coal hopper 24, a second extended coal feeder 22, and a second short coal feeder 13, achieving cross-feeding. Specifically, this utility model utilizes the first and second external coal hoppers for cross-feeding, thus avoiding blockages caused by feeding coal from a single coal bunker. Furthermore, compared to existing coal conveying methods, this solution improves coal transport efficiency within the coal bunker by utilizing extended coal feeders and connecting them to the coal bunker and external coal hoppers, achieving a highly efficient coal conveying effect.

[0036] In one implementation, such as Figure 2 As shown, Figure 2This is a side view of an embodiment of the cross-coal conveying device for a thermal power plant provided by this utility model. The device includes a first bidirectional pneumatic gate 15, a second bidirectional pneumatic gate 26, a third bidirectional pneumatic insertion / removal gate 25, and a fourth bidirectional pneumatic gate 16. A first external coal hopper 14 is connected to a first long coal feeder 12 via the first bidirectional pneumatic gate 15; the first long coal feeder 12 is connected to a first short coal feeder 23 via the second bidirectional pneumatic gate 26; a second external coal hopper 24 is connected to a second long coal feeder 22 via the third bidirectional pneumatic gate 25; and the second long coal feeder 22 is connected to a second short coal feeder 13 via the fourth bidirectional pneumatic gate 16.

[0037] When the coal stored in the first coal bunker 11 is conveyed to the outlet of the first short coal feeder 23, the bidirectional pneumatic gate 15 and bidirectional pneumatic gate 26 open. The coal then flows from the first coal bunker 14 to the discharge port of the first short coal feeder 23 in the first extended coal feeder 12. That is, the coal in the first coal bunker 11 passes through the bidirectional pneumatic gate 15 → to the first extended coal feeder 12 → bidirectional pneumatic gate 26 → above the first short coal feeder 23, completing the coal conveying process. By installing the bidirectional pneumatic gate in the cross-coal conveying device of the thermal power plant, the coal movement of multiple coal bunkers can be realized, making coal conveying more convenient and faster. In special circumstances, it can also realize the reverse transmission of coal, which is beneficial to the separation of coal materials.

[0038] In one embodiment, such as Figure 3 and Figure 4 As shown, Figure 3 This is a top view schematic diagram of the reinforced clamp structure in the cross-coal conveying device for thermal power plants according to this utility model. Figure 4 This is a side view of the reinforced clamp structure in the cross-coal conveying device for thermal power plants according to this utility model. The first external coal hopper 14 is connected to the first coal bunker 11 through the reinforced clamp; the second external coal hopper 24 is connected to the second coal bunker 21 through the reinforced clamp. The reinforced clamp is made of low-alloy high-strength structural steel of Q345B material. The use of the reinforced clamp can realize the connection between the external coal hopper and the coal bunker. Moreover, Q345B material has strong compressive strength, is not easy to deform, and can withstand the high load during construction. In addition, Q345B clamp can be reused several times, reducing material waste.

[0039] In one embodiment, the first coal bunker, the second coal bunker, the first external coal hopper, and the second external coal hopper are each equipped with a blockage clearing machine at their coal drop outlets. It should be noted that, for example... Figure 2As shown, the unblocking machine 27 is installed at the coal drop-off point of the second coal bunker 21, that is, between the second coal bunker 21 and the first short coal feeder 23. The unblocking machine 18 is installed at the coal drop-off point of the first external coal hopper, that is, between the first external coal hopper and the first long coal feeder 12. In order to solve the problem of easy blockage during coal transportation, unblocking machines are installed in the coal bunker and the external coal hopper respectively. When transporting coal, the unblocking machine is used to clean the adhesive at the coal drop-off point, which can improve the efficiency of coal transportation.

[0040] In one embodiment, such as Figure 5 As shown, Figure 5 This is a side view of the unblocking machine in the cross-coal conveying device of the cross-fired power plant of this utility model. The unblocking machine mainly adopts a modular design and is mainly composed of three parts: upper chamber 2, slewing assembly 3, and lower chamber 4.

[0041] Specifically, a three-dimensional variable cross-section rotary scraper 30 and a gate valve 5 are provided in the rotary assembly 3, such as... Figure 6 As shown, Figure 6 This is a top-view structural diagram of the unblocking machine. The three-dimensional variable cross-section rotating scraper adopts a three-dimensional variable cross-section design and has a 360-degree rotation function. It has low resistance and does not damage the bin wall. Because of the scraper rotation, the scraper can reach the top of the coal feeder (including the coal feeder and the extended coal feeder) belt through the gate valve, avoiding the unblocking blind zone at the bottom of the traditional unblocking machine, which causes coal blockage problems between the unblocking machine, the gate valve and the coal feeder connection port.

[0042] In one embodiment, refer to Figure 7 , Figure 7 This is another structural schematic diagram of the unblocking machine in the cross-coal conveying device for thermal power plants provided by this utility model. The three-dimensional variable cross-section rotating scraper is arranged longitudinally inside the unblocking machine; the built-in three-dimensional variable cross-section rotating scraper includes a three-dimensional variable cross-section upper rotating scraper 31 and a three-dimensional variable cross-section lower rotating scraper 32. Since the scraper cross-section is small and arranged longitudinally, it will not cause secondary blockage of materials.

[0043] Specifically, the cleaning height of the unblocking machine can reach 2200 mm, covering a large area and eliminating blind spots. In addition, combined with anti-wear technology, it ensures zero wear between the three-dimensional variable cross-section rotating scraper and the upper and lower chambers 2 and 4, resulting in smooth operation. Furthermore, the modular design prevents coal dust from contacting the drive mechanism, avoiding coal dust from entering the rotating mechanism and reducing bearing wear. At the same time, it is easy to maintain and has low cost. The sealing flange is made of wear-resistant ductile iron, providing excellent sealing performance.

[0044] In one embodiment, reference is made to Figure 8 , Figure 8This is a schematic diagram of the external coal hopper in the cross-coal conveying device provided by this utility model. The first and second external coal hoppers are made of 10mm thick Q235A steel + 3mm thick 304 stainless steel, and the Q235A steel and 304 stainless steel are connected by plug welding. It should be noted that Q235A is a common carbon structural steel used for structural components that bear certain pressure and load. It has good weldability and formability. In the external coal hopper, the Q235A steel plate is 10mm thick and serves as the main load-bearing part. 304 stainless steel is an austenitic stainless steel with excellent corrosion resistance and oxidation resistance. In the external coal hopper, the 304 stainless steel layer is 3mm thick and is mainly used to enhance the external corrosion resistance, possibly for parts that come into contact with coal dust, moisture, or other corrosive substances.

[0045] Furthermore, to address the issue of ease of construction, the external coal hopper is constructed using a segmented approach for transportation and welding, such as... Figure 8 As shown, the external coal hopper is divided into a first compartment 101, a second compartment 102, a third compartment 103, and a fourth compartment 104. To facilitate transportation and ensure weld stability, the welds between the compartments are continuous welds. The fillet welds have a weld height of not less than 10mm, and the butt welds have a penetration depth of not less than 10mm. Furthermore, to enhance structural stability, the external coal hopper employs... Figure 8 The upper part is reinforced with steel plate 105, the first side reinforced steel plate 106, the second side reinforced steel plate 107, the third side reinforced steel plate 108, the fourth side reinforced steel plate 109, the fifth side reinforced steel plate 110, and the bottom reinforced steel plate 111 to fix the structure, making the structure of the external coal hopper more stable, less prone to damage when bearing load, and further improving the efficiency of coal transportation.

[0046] This application utilizes a first external coal hopper and a second external coal hopper for cross-conveying, thereby avoiding blockages caused by conveying coal from a single coal bunker. Furthermore, compared to existing coal conveying methods, this solution improves coal transfer efficiency within the coal bunker and achieves highly efficient coal conveying by employing an extended coal feeder and connecting it to the coal bunker and external coal hoppers.

[0047] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A device for cross-conveying coal in a thermal power plant, characterized in that, It includes several coal feeders, wherein the several coal feeders include a first short coal feeder, a second short coal feeder, a first long coal feeder and a second long coal feeder; The first coal bunker is equipped with a first external coal hopper, the coal outlet of which is connected to a first long coal feeder; the first long coal feeder is connected to a first short coal feeder; and the first short coal feeder is connected to the coal outlet of the second coal bunker. The second coal bunker is equipped with a second external coal hopper; the coal outlet of the second external coal hopper is connected to the second long coal feeder; the second long coal feeder is connected to the second short coal feeder; and the second short coal feeder is connected to the coal outlet of the first coal bunker.

2. The apparatus for cross-conveying coal in a thermal power plant as described in claim 1, characterized in that, The first and second long coal feeders have built-in conveyor belts, and the conveying speed is adjusted by the conveyor belts.

3. The apparatus for cross-conveying coal in a thermal power plant as described in claim 1, characterized in that, The device for cross-coal conveying in the thermal power plant also includes: a first bidirectional pneumatic gate, a second bidirectional pneumatic gate, a third bidirectional pneumatic gate, and a fourth bidirectional pneumatic gate. The first external coal hopper is connected to the first long coal feeder through the first bidirectional pneumatic gate; The first long coal feeder is connected to the first short coal feeder through the second bidirectional pneumatic gate; The second external coal hopper is connected to the second long coal feeder through the third bidirectional pneumatic gate; The second long feeder is connected to the second short feeder through the fourth bidirectional pneumatic gate.

4. The apparatus for cross-conveying coal in a thermal power plant as described in claim 1, characterized in that, The first external coal hopper is connected to the first coal bunker via a first reinforcing clamp; the second external coal hopper is connected to the second coal bunker via a second reinforcing clamp.

5. The apparatus for cross-conveying coal in a thermal power plant as described in claim 1, characterized in that, The first coal bunker, the second coal bunker, the first external coal hopper, and the second external coal hopper are each equipped with a blockage clearing machine at their coal discharge ports.

6. The apparatus for cross-conveying coal in a thermal power plant as described in claim 5, characterized in that, The unblocking machine is provided with an upper chamber, a rotary assembly, and a lower chamber; the upper chamber is located at the upper end of the rotary assembly; the upper chamber is used to connect with the coal drop outlets of the first coal bunker, the second coal bunker, the first external coal hopper, and / or the second external coal hopper; the lower chamber is located at the lower end of the rotary assembly, and the lower chamber is used to connect with the first short coal feeder, the second short coal feeder, the first long coal feeder, and / or the second long coal feeder.

7. The apparatus for cross-conveying coal in a thermal power plant as described in claim 6, characterized in that, The rotary assembly is equipped with a three-dimensional variable cross-section rotary scraper and a gate valve; the three-dimensional variable cross-section rotary scraper is built into the rotary assembly, and the gate valve is located between the rotary assembly and the lower compartment.

8. The apparatus for cross-conveying coal in a thermal power plant as described in claim 7, characterized in that, The three-dimensional variable cross-section rotary scraper moves on the conveyor belt of the coal feeder via the gate valve; the three-dimensional variable cross-section rotary scraper cleans the adhesive material along the walls of the upper bin and / or the lower bin under the drive of the rotary assembly.

9. The apparatus for cross-conveying coal in a thermal power plant as described in claim 1, characterized in that, The first and second external coal hoppers are made of stainless steel and are each made of four sections welded together.

10. The apparatus for cross-conveying coal in a thermal power plant as described in claim 9, characterized in that, The weld obtained by welding the silo body is a continuous weld, the fillet weld height is not less than 10mm, and the butt weld penetration is not less than 10mm.

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