Raw coal bunker double-bunker intercommunication coal blending mechanism with telescopic groove

Abstract

The utility model relates to a raw coal bunker double-bunker intercommunication coal blending mechanism with a telescopic groove. Comprising a raw coal bunker, a gate valve and an auger coal blending mechanism. The auger coal blending mechanism comprises a motor, a telescopic U-shaped groove, a rail, an H-shaped guide wheel, a flow guide plate, an electric-hydraulic push rod, a spiral blade, a hoisting bearing, a U-shaped shell and an upper plate. Under the condition that an original coal conveying and blending system is not changed at all, the two raw coal bins are communicated only by additionally arranging the auger coal blending mechanism, one bin is filled with high-quality coal, the other bin is filled with inferior coal, the gate valve of one bin can be opened, the gate valve of the other bin can be closed according to the requirements of different loads and depth peak regulation, and the coal conveying and blending efficiency is improved. And through the coal blending mechanism, the two bins can simultaneously provide a coal type adaptive to the load to the coal feeder in real time so as to adapt to the all-day quick load change requirement of the unit. The existing raw coal bunker equipment is slightly transformed, so that quick coal-to-coal blending combustion of different coal types is realized, and double high benefits of good load response and high economical efficiency are obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of coal feeding, in particular to a double-bin intercommunication coal distribution mechanism for raw coal bins with telescopic grooves. Background Art

[0002] Due to the randomness, volatility, and intermittency of renewable energy power generation, its contribution to the peak load regulation of the power grid is extremely limited. Therefore, coal-fired power units with good peak load regulation potential still play an important role in ensuring the normal operation of the power grid. In recent years, the positioning of coal-fired power is accelerating its transformation towards a capacity-guaranteed power source. Under the capacity electricity price mechanism, the premise of giving capacity electricity fees to coal-fired power units is that they can give full play to the value of supporting regulation capacity and strictly adjust according to dispatch instructions when the power system needs it. While power generation companies recover fixed costs, they will also face greater assessment pressure. The performance of the unit's downward adjustment capability, peak capacity, and variable load rate directly affects the capacity benefits, and excessive adjustment may also accelerate equipment loss. Therefore, keeping up with the pace of power reform and promoting flexibility transformation are the key to the transformation of coal-fired power.

[0003] Since the raw coal bunker renovation project is small in scale and has a lower cost than other flexibility renovation projects, it has become a key project in the unit flexibility renovation.

[0004] Normally, the raw coal bunker of a boiler is equipped with one coal feeder for one coal mill. Only one type of coal can be stored in one raw coal bunker. Only after the old coal in the bunker is burned out can the new coal be burned. Even if mixed coal is implemented, it can only be carried out in the coal yard, and it is impossible to store more than two types of coal in one raw coal bunker. Many years of research have been carried out at home and abroad on mixed coal combustion, and rich results have been achieved. The separate grinding and pulverizing technology and in-furnace blending technology commonly used in domestic power plants, or the mixed coal method in the coal yard, but these existing coal blending and combustion cannot meet the requirements of real-time accurate and rapid combustion optimization and flexible operation of the unit.

[0005] Taking the medium-speed mill as an example, the output that can be guaranteed by the current coal type can generally be maintained at 30%-100% or 50%-100%. When the deviation from the designed coal type is large, the weighted average coal quality cannot take into account the full load operation of the full unit and the large-scale blending operation of the general load. When the coal type needs to be switched, it is completed by re-loading the coal through the coal conveyor belt. It can run for 6 to 8 hours when the warehouse is full. Generally, the radar level meter can still run for a period of time after the material level is 0. If you want to change the coal type of a coal bunker, it will take at least 3 hours.

[0006] Therefore, it is necessary to transform the raw coal bunker to meet the requirements of rapid load changes throughout the day, so as to achieve more accurate and rapid coal blending and burning, and quickly switch coal types according to peak demand. High load and minimum stable combustion load use high calorific value coal, and other loads use low calorific value coal. Not only does it have a fast load response speed, but it also increases the amount of low calorific value coal blending, reduces fuel costs, and increases profit margins. Utility Model Content

[0007] In order to overcome the deficiencies in the above-mentioned prior art, the utility model provides a double-bin interconnected coal distribution mechanism with a telescopic slot for raw coal bins. The two raw coal bins are connected by an auger coal distribution mechanism, one bin is loaded with high-quality coal, and the other bin is loaded with low-quality coal. According to the needs of different loads and deep peak regulation, the gate valve of one bin can be opened and the gate valve of the other bin can be closed. Through the coal distribution mechanism, the two bins can simultaneously provide a type of coal adapted to the load to the coal feeder in real time, so as to meet the requirements of rapid load changes of the unit throughout the day, and high calorific value coal is used for high load and minimum stable combustion load, and low calorific value coal is used for other loads, so as to improve load response.

[0008] In order to solve the above technical problems, the technical solution adopted by the utility model is: a double-bin interconnected coal distribution mechanism with a telescopic slot, including two left and right raw coal bins, a gate valve is arranged at the bottom of each raw coal bin, and an auger coal distribution mechanism connecting the two raw coal bins;

[0009] The auger coal dispensing mechanism is arranged below the gate valve, and includes a motor, a telescopic U-shaped groove, a track, an H-shaped guide wheel that assists the telescopic U-shaped groove to slide on the track, a guide plate, an electro-hydraulic push rod, a spiral blade, a hanging bearing that plays a fixing role, a U-shaped shell and an upper plate;

[0010] Among them, the U-shaped shell of the auger coal distribution mechanism is welded and connected to the outer shells of the left and right raw coal bins, the upper plate covers the U-shaped shell and is welded to the U-shaped shell, one end of the track is arranged on the outside of the two ends of the U-shaped shell, and the other end extends into the raw coal bin and is welded and fixed to the inner wall of the raw coal bin, an H-shaped guide wheel is arranged on the outside of the telescopic U-shaped groove, the H-shaped guide wheel is covered with a guide plate, the H-shaped guide wheel is axially connected and fixed to the telescopic U-shaped groove, the H-shaped guide wheel is installed on the track, the base of the electro-hydraulic push rod is welded and fixed to the upper plate, the telescopic end of the electro-hydraulic push rod is connected to the telescopic U-shaped groove, the motor is located on the outside of the left and right raw coal bins and is axially connected with a driving shaft, a spiral blade is fixed on the driving shaft, and the center point of the driving shaft is fixedly connected to the upper plate through a hoisting bearing.

[0011] Among them, the telescopic range of the electro-hydraulic push rod is 1.5 meters. Under the action of the electro-hydraulic push rod, the telescopic U-shaped groove can enter the raw coal bin along the track, extending the length of the U-shaped shell into the raw coal bin by 0-1.5 meters.

[0012] Among them, when the gate valve of the left raw coal bunker is opened and the gate valve of the right raw coal bunker is closed, the electro-hydraulic push rod starts and pushes the telescopic U-shaped groove along the track into the left raw coal bunker, and part of the high-quality coal stored in the left raw coal bunker enters the coal feeder below, and part falls into the telescopic U-shaped groove. The motor rotates forward, and the motor drives the spiral blade to rotate, and the high-quality coal in the left raw coal bunker is transported to the coal feeder corresponding to the right raw coal bunker through the auger coal blending mechanism, so that the two raw coal bunkers can be blended and burned with high-quality coal at the same time. Conversely, when the gate valve of the left raw coal bunker is closed and the gate valve of the right raw coal bunker is opened, the electro-hydraulic push rod starts and pushes the telescopic U-shaped groove along the track into the right raw coal bunker, and the motor reverses, and the auger coal blending mechanism transports the inferior coal in the right raw coal bunker to the left raw coal bunker, so that the two raw coal bunkers can be blended and burned with inferior coal at the same time.

[0013] When the electro-hydraulic push rod is closed, the telescopic U-shaped groove shrinks back to the outside of the raw coal bin, and the coal flows in the left and right raw coal bins fall into the coal feeder below respectively. The spiral blades run idly under the drive of the motor to disturb the coal flow and prevent coal blockage.

[0014] Wherein, the gap between the spiral blade and the U-shaped shell is smaller than the coal particle size.

[0015] The coal delivery capacity of the auger coal distribution mechanism is equivalent to the coal delivery capacity of the coal feeder below the coal drop port of the raw coal bin, and the rotation speed of the motor and the spiral blade matches the rotation speed of the coal feeder.

[0016] Among them, the gate valve is arranged above 1650mm of the inner diameter of the raw coal bunker, and the coal falling flow rate meets the maximum working load of the coal mill.

[0017] Wherein, the U-shaped shell is suspended on the ceiling through a support bracket.

[0018] Among them, the U-shaped shell is 15 meters long.

[0019] Wherein, the guide plate is arranged above the track and the H-type guide wheel. When the telescopic U-shaped groove enters the raw coal bin, the guide plate blocks the coal from falling into the track and the H-type guide wheel, preventing the track and the H-type guide wheel from getting stuck with coal.

[0020] By adopting the above technical solution, the beneficial effects obtained by the utility model are:

[0021] The utility model discloses a double-bin interconnected coal distribution mechanism for raw coal bins with telescopic grooves. Without making any changes to the original coal conveying and coal distribution systems, two raw coal bins are connected only by raising the position of the gate valve and adding an auger coal distribution mechanism. One bin is filled with high-quality coal and the other is filled with low-quality coal. According to the needs of different loads and depth peak regulation, the gate valve of one bin is opened and the gate valve of the other bin is closed. Through the coal distribution mechanism, the two bins can simultaneously provide the coal feeder with a type of coal that is adapted to the load in real time, so as to meet the unit's requirements for rapid load changes throughout the day and improve load response. The utility model discloses a double-bin interconnected coal distribution mechanism for raw coal bins with telescopic grooves, which flexibly controls the coal flow and realizes the purpose of quickly changing the type of coal. By implementing a small amount of modification on the existing raw coal bin equipment, it realizes the rapid change and blending of different types of coal, and realizes accurate real-time online switching of coal types to meet the requirements of rapid load changes throughout the day. High load and minimum stable combustion load use high calorific value coal, and other loads use low calorific value coal, which improves load response, achieves the dual high benefits of good load response and high economy, and effectively enhances the market competitiveness of the enterprise.

[0022] The utility model is described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The utility model discloses a structural schematic diagram of a double-bin interconnected coal distribution mechanism of raw coal bins with telescopic grooves.

[0024] Figure 2 The utility model is a bottom view of a double-bin interconnected coal distribution mechanism of raw coal bins with telescopic grooves.

[0025] In the figure: 1-raw coal bunker, 2-gate valve, 3-motor, 4-telescopic U-shaped groove, 5-track, 6-H-type guide wheel, 7-guide plate, 8-electro-hydraulic push rod, 9-spiral blade, 10-hoisting bearing, 11-U-shaped shell, 12-upper plate. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the implementation scheme of the present invention is described in detail below with reference to the accompanying drawings.

[0027] In one embodiment of the utility model, a double-bin interconnected coal distribution mechanism with telescopic grooves includes two left and right raw coal bins 1, a gate valve 2 is provided at the bottom of each raw coal bin 1, and an auger coal distribution mechanism connecting the two raw coal bins 1.

[0028] like Figure 1As shown, the auger coal-feeding mechanism is arranged below the gate valve 2, and the auger coal-feeding mechanism includes a motor 3, a telescopic U-shaped groove 4, a track 5, an H-shaped guide wheel 6 that assists the telescopic U-shaped groove 4 to slide on the track 5, a guide plate 7, an electro-hydraulic push rod 8, a spiral blade 9, a hanging bearing 10 that plays a fixing role, a U-shaped shell 11 and an upper plate 12.

[0029] like Figure 1 As shown, the U-shaped shell 11 of the auger coal distribution mechanism is welded to the outer shells of the left and right raw coal bins 1, the upper plate 12 covers the U-shaped shell 11 and is welded to the U-shaped shell 11, one end of the track 5 is arranged on the outside of the two ends of the U-shaped shell 11, and the other end extends into the raw coal bin 1 and is welded and fixed to the inner wall of the raw coal bin 1, an H-shaped guide wheel 6 is arranged on the outside of the telescopic U-shaped groove 4, the guide plate 7 is covered on the H-shaped guide wheel 6, the H-shaped guide wheel 6 is axially connected and fixed to the telescopic U-shaped groove 4, the H-shaped guide wheel 6 is installed on the track 5, the base of the electro-hydraulic push rod 8 is welded and fixed to the upper plate 12, the telescopic end of the electro-hydraulic push rod 8 is connected to the telescopic U-shaped groove 4, the motor 3 is located on the outside of the left and right raw coal bins 1 and is axially connected with a driving shaft, a spiral blade 9 is fixed on the driving shaft, and the center point of the driving shaft is fixedly connected to the upper plate 12 through a hanging bearing 10.

[0030] In one embodiment of the utility model, the telescopic amount of the electro-hydraulic push rod 8 is 1.5 meters, and the telescopic U-shaped groove 4 can enter the raw coal bin 1 along the track 5 under the action of the electro-hydraulic push rod 8, and extend the length of the U-shaped shell 11 by 0-1.5 meters into the raw coal bin 1. After the electro-hydraulic push rod 8 is extended, the telescopic U-shaped groove 4 is connected with the U-shaped shell 11 to form a complete conveying groove, and coal is transported between the two raw coal bins.

[0031] In one embodiment of the utility model, when the gate valve 2 of the left raw coal bin 1 is opened and the gate valve 2 of the right raw coal bin 1 is closed, the electro-hydraulic push rod 8 is started and pushes the telescopic U-shaped groove 4 along the track 5 to enter the left raw coal bin 1, and part of the high-quality coal stored in the left raw coal bin 1 enters the coal feeder below, and part falls into the telescopic U-shaped groove 4, the motor 3 rotates forward, and the motor 3 drives the spiral blade 9 to rotate, and the high-quality coal in the left raw coal bin 1 is transported to the coal feeder corresponding to the right raw coal bin through the auger coal blending mechanism, so that the two raw coal bins 1 are blended and burned with high-quality coal at the same time. Conversely, when the gate valve 2 of the left raw coal bin 1 is closed and the gate valve 2 of the right raw coal bin 1 is opened, the electro-hydraulic push rod 8 is started and pushes the telescopic U-shaped groove 4 along the track 5 to enter the right raw coal bin 1, the motor 3 is reversed, and the auger coal blending mechanism transports the low-quality coal in the right raw coal bin 1 to the left raw coal bin 1, so that the two raw coal bins 1 are blended and burned with low-quality coal at the same time.

[0032] In one embodiment of the utility model, when the electro-hydraulic push rod 8 is closed, the telescopic U-shaped groove 4 shrinks back to the outside of the raw coal bin 1, and the coal flows in the left and right raw coal bins 1 respectively fall into the coal feeder below, and the spiral blades 9 idle under the drive of the motor 3 to disturb the coal flow and prevent coal blockage.

[0033] In one embodiment of the present invention, the gap between the spiral blade 9 and the U-shaped shell 11 is smaller than the coal particle size. When the spiral blade 9 rotates, the coal will not get stuck between the spiral blade 9 and the U-shaped shell 11.

[0034] In one embodiment of the utility model, the coal delivery capacity of the auger coal distribution mechanism is equivalent to the coal delivery capacity of the coal feeder below the coal drop port of the raw coal bin, and the rotation speed of the motor 3 and the spiral blade 9 matches the rotation speed of the coal feeder.

[0035] In one embodiment of the utility model, the gate valve 2 is arranged at a position above 1650 mm of the inner diameter of the raw coal bin 1, and the coal falling flow rate meets the maximum working load of the coal mill.

[0036] In one embodiment of the present invention, the U-shaped shell 11 is suspended on the ceiling by means of a support bracket, without increasing the load on the raw coal bin.

[0037] In one embodiment of the present invention, the U-shaped shell 11 is 15 meters long, and its two ends are respectively welded and fixed to the left and right raw coal bins 1 .

[0038] In one embodiment of the utility model, the guide plate 7 is arranged above the track 5 and the H-type guide wheel 6. When the telescopic U-shaped groove 4 enters the raw coal bin 1, the guide plate 7 blocks the coal from falling into the track 5 and the H-type guide wheel 6, preventing the track 5 and the H-type guide wheel 6 from being stuck with coal.

[0039] In summary, the utility model of a double-bin interconnected coal distribution mechanism with a telescopic groove of a raw coal bunker has the following advantages: without making any changes to the raw coal transportation and coal distribution system, only by raising the gate valve position and adding an auger coal distribution mechanism, the two raw coal bunkers are connected, one bunker is filled with high-quality coal, and the other bunker is filled with low-quality coal. According to the needs of different loads and deep peak regulation, the gate valve of one bunker is opened, the gate valve of the other bunker is closed, and the telescopic U-shaped grooves of the two raw coal bunkers are adjusted. Through the coal distribution mechanism, the two bunkers can simultaneously provide a type of coal that is suitable for the load to the coal feeder in real time, so as to meet the requirements of rapid load changes of the unit throughout the day and improve the load response. By implementing a small amount of modification to the existing raw coal bunker equipment, the purpose of interconnecting the two bunkers, flexibly controlling the coal flow, and quickly changing the type of coal is achieved, in order to meet the requirements of rapid load changes throughout the day, high loads and the lowest stable combustion load use high calorific value coal, and other loads use low calorific value coal, so as to achieve the dual high benefits of good load response and high economy. It has the advantages of low transformation cost, small construction and modification workload, safety and reliability, and flexible operation mode. It is an effective means to reduce enterprise operating costs, improve enterprise operating conditions, and meet the deep peak regulation requirements of the power grid.

[0040] The specific implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A double-compartment intercommunication coal distribution mechanism for raw coal bunkers with telescopic slots, characterized in that It comprises two left and right raw coal bunkers (1), a gate valve (2) is arranged at the bottom of each raw coal bunker (1), and an auger coal distribution mechanism connecting the two raw coal bunkers (1); The auger coal dispensing mechanism is arranged below the gate valve (2), and comprises a motor (3), a telescopic U-shaped groove (4), a track (5), an H-shaped guide wheel (6) for assisting the telescopic U-shaped groove (4) to slide on the track (5), a guide plate (7), an electro-hydraulic push rod (8), a spiral blade (9), a hanging bearing (10) for fixing, a U-shaped shell (11) and an upper plate (12); The U-shaped shell (11) of the auger coal distribution mechanism is welded to the outer shells of the left and right raw coal bins (1); the upper plate (12) covers the U-shaped shell (11) and is welded to the U-shaped shell (11); one end of the track (5) is arranged on the outside of the two ends of the U-shaped shell (11), and the other end extends into the raw coal bin (1) and is welded and fixed to the inner wall of the raw coal bin (1); an H-shaped guide wheel (6) is arranged on the outside of the telescopic U-shaped groove (4); the guide plate (7) is covered on the H-shaped guide wheel (6); The H-shaped guide wheel (6) is axially connected and fixed to the telescopic U-shaped groove (4), and the H-shaped guide wheel (6) is installed on the track (5). The base of the electro-hydraulic push rod (8) is welded and fixed to the upper plate (12), and the telescopic end of the electro-hydraulic push rod (8) is connected to the telescopic U-shaped groove (4). The motor (3) is located outside the left and right raw coal bins (1) and is axially connected to a driving shaft, on which a spiral blade (9) is fixed, and the center point of the driving shaft is fixedly connected to the upper plate (12) through a hanging bearing (10).

2. The double-compartment intercommunication coal distribution mechanism with telescopic slots for raw coal bunkers according to claim 1 is characterized in that The telescopic range of the electro-hydraulic push rod (8) is 1.5 meters. Under the action of the electro-hydraulic push rod (8), the telescopic U-shaped groove (4) can enter the interior of the raw coal bin (1) along the track (5), and extend the length of the U-shaped shell (11) into the interior of the raw coal bin (1) by 0-1.5 meters.

3. The double-compartment intercommunication coal distribution mechanism with telescopic slots for raw coal bunkers according to claim 1 is characterized in that When the gate valve (2) of the raw coal bin (1) on the left is opened and the gate valve (2) of the raw coal bin (1) on the right is closed, the electro-hydraulic push rod (8) starts and pushes the telescopic U-shaped groove (4) along the track (5) to enter the interior of the raw coal bin (1) on the left, and part of the high-quality coal stored in the raw coal bin (1) on the left enters the coal feeder below and part falls into the telescopic U-shaped groove (4). The motor (3) rotates forward, and the motor (3) drives the spiral blade (9) to rotate, so that the high-quality coal in the raw coal bin (1) on the left is transported to the raw coal bin on the right through the auger coal distribution mechanism. (1), falls into the corresponding coal feeder, so that the two raw coal bins (1) are mixed with high-quality coal at the same time. On the contrary, when the gate valve (2) of the left raw coal bin (1) is closed and the gate valve (2) of the right raw coal bin (1) is opened, the electro-hydraulic push rod (8) is started and pushes the telescopic U-shaped groove (4) along the track (5) into the right raw coal bin (1), the motor (3) is reversed, and the auger coal mixing mechanism transports the low-quality coal from the right raw coal bin (1) to the left raw coal bin (1), so that the two raw coal bins (1) are mixed with low-quality coal at the same time.

4. The double-compartment intercommunication coal distribution mechanism with telescopic slots for raw coal bunkers according to claim 1 is characterized in that When the electro-hydraulic push rod (8) is closed, the telescopic U-shaped groove (4) is retracted back to the outside of the raw coal bin (1), and the coal flows in the left and right raw coal bins (1) respectively fall into the coal feeder below, and the spiral blades (9) are driven by the motor (3) to idle, disturbing the coal flow and preventing coal blockage.

5. The double-compartment intercommunication coal distribution mechanism with telescopic slots for raw coal bunkers according to claim 1 is characterized in that The gap between the spiral blade (9) and the U-shaped shell (11) is smaller than the coal particle size.

6. The double-compartment intercommunication coal distribution mechanism with telescopic slots for raw coal bunkers according to claim 1 is characterized in that The coal delivery capacity of the auger coal distribution mechanism is equivalent to the coal delivery capacity of the coal feeder below the coal drop port of the raw coal bin, and the rotation speed of the motor (3) and the spiral blade (9) matches the rotation speed of the coal feeder.

7. The double-compartment intercommunication coal distribution mechanism with telescopic slots for raw coal bunkers according to claim 1 is characterized in that The gate valve (2) is arranged above 1650 mm of the inner diameter of the raw coal bin (1), and the coal falling flow rate meets the maximum working load of the coal mill.

8. The double-compartment intercommunication coal distribution mechanism with telescopic slots for raw coal bunkers according to claim 1 is characterized in that The U-shaped shell (11) is suspended on the ceiling via a support bracket.

9. The double-compartment intercommunication coal distribution mechanism with telescopic slots for raw coal bunkers according to claim 1 is characterized in that The U-shaped shell (11) is 15 meters long.

10. The double-compartment intercommunication coal distribution mechanism with telescopic slots for raw coal bunkers according to claim 1, characterized in that The guide plate (7) is arranged above the track (5) and the H-shaped guide wheel (6). When the telescopic U-shaped groove (4) enters the raw coal bin (1), the guide plate (7) blocks the coal from falling into the track (5) and the H-shaped guide wheel (6), thereby preventing the track (5) and the H-shaped guide wheel (6) from being stuck with the coal.

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