Raw coal bunker intercommunication mechanism for double-inlet and double-outlet coal mill

Abstract

The utility model relates to a raw coal bunker intercommunication mechanism of a double-inlet and double-outlet coal mill, which comprises a raw coal bunker system, an intercommunication coal feeding system and the double-inlet and double-outlet coal mill, the raw coal bunker system comprises a rectangular raw coal bunker, a partition wall and a gate, the partition wall divides the rectangular raw coal bunker into two sub-bunkers, the intercommunication coal feeding system comprises a screw conveyer, a guide plate and a coal feeder, and the gate is arranged on the screw conveyer. The two opposite ends of the spiral conveyor extend into two branch bins of the raw coal bin respectively, the flow guide plate is vertically fixed below a gate of the raw coal bin and divides the coal hopper into two small subareas, and the spiral conveyor can be driven by the motor to rotate forwards or reversely and is used for mutual conveying of coal in the two bins. According to the double-inlet double-outlet coal mill, the two raw coal bins are divided to store different coal materials respectively, deep coal blending can be achieved through the spiral conveyors, the full-load capacity of the unit is guaranteed, the possibility that the most economical coal type is combusted under different loads is kept, and the problem that the double-inlet double-outlet coal mill is overheated after being subjected to single-side operation for a long time after the divided bins are transformed is solved.

Description

Technical Field

[0001] The utility model relates to the field of coal feeding technology, specifically to an interconnection mechanism for the raw coal bunker of a double-inlet double-outlet coal mill. Background Technology

[0002] Currently, thermal power plants often use coal blending to reduce fuel costs. However, existing coal conveying systems have many problems. For example, traditional raw coal bunkers have a simple structure and cannot flexibly allocate different types of coal, making it difficult to effectively adjust the operation of the unit according to load demand and the economics of different coal types.

[0003] The existing raw coal bunker partitioning modification divides the original bunker into two parts to store different types of coal, and controls the coal flow on both sides through gate valves for real-time coal blending and combustion. However, for coal conveying systems equipped with dual-inlet, dual-outlet coal mills, the lack of an effective interconnection mechanism in the raw coal bunker partitioning setting can easily lead to adverse conditions such as overheating of one side of the coal mill, affecting the service life and operational stability of the equipment, and reducing the efficiency and economy of the entire power generation system. Summary of the Invention

[0004] To overcome the shortcomings of the existing technology, this utility model provides an interconnection mechanism for the raw coal bins of a double-inlet, double-outlet coal mill. A screw conveyor connects the coal hoppers of the two raw coal bins, one containing high-quality coal and the other low-quality coal. The gate valves of each bin are adjusted according to different loads and peak-shaving needs, and the coal is transferred to the boiler in real time via the screw conveyor, providing a coal ratio adapted to the load to meet the unit's rapid load changes throughout the day.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a raw coal bunker interconnection mechanism for a double-inlet double-outlet coal mill, characterized in that it includes a raw coal bunker system, an interconnection coal feeding system and a double-inlet double-outlet coal mill.

[0006] The raw coal storage system includes a rectangular raw coal storage unit. A partition wall is installed on the upper part of the rectangular raw coal storage unit, dividing the rectangular raw coal storage unit into two parts: raw coal storage compartment A and raw coal storage compartment B. A gate door A is installed in the conical coal hopper at the bottom of raw coal storage compartment A, and a gate door B is installed in the conical coal hopper at the bottom of raw coal storage compartment B.

[0007] The interconnected coal feeding system includes a screw conveyor and a guide plate installed below gate A and gate B. The opposite ends of the screw conveyor extend into the lower coal hoppers of raw coal bunker A and raw coal bunker B, respectively. The guide plate is vertically fixed and divides the coal hopper into two parts. The screw conveyor can rotate forward or reverse under the drive of a motor for mutual transfer of coal between the two bunkers.

[0008] The interconnected coal feeding system also includes a coal feeder A located below the raw coal bunker compartment A and a coal feeder B located below the raw coal bunker compartment B. The coal feeder A and the coal feeder B respectively feed coal to the double-inlet double-outlet coal mill.

[0009] The gate A and gate B are installed at a diameter of 2m in the conical coal hopper of the rectangular raw coal bunker. Gate A and gate B each include two inclined gates, and their opening and closing directions form a 20° angle with the running direction of the screw conveyor.

[0010] The partition wall is installed along the running direction of the coal conveyor belt. The partition wall includes a rigid beam with a pitch in the range of 1000mm to 1200mm and steel plates fixed on both sides of the rigid beam. The rigid beam can be made of HW250 steel of Q355B material, and the steel plate can be 10mm thick Q235B steel plate. Radar level gauges are installed on both sides of the partition wall.

[0011] The guide plate is arranged parallel to the running direction of the screw conveyor, and the space on the side where the screw conveyor is located occupies 60% of the total space below the gate, ensuring smooth coal flow on the side where the screw conveyor is located.

[0012] The raw coal silo A stores high-calorific-value coal, while the raw coal silo B stores low-calorific-value coal. When gate A is opened and gate B is closed, some of the coal in raw coal silo A directly enters the lower coal feeder A, while some of the coal falls onto the screw conveyor and is transported to raw coal silo B, and then enters the lower coal feeder B.

[0013] The drive motor of the screw conveyor is located outside the rectangular raw coal bunker, and the speed of the drive motor is matched with the speed of the coal feeder. The maximum coal conveying capacity of the screw conveyor meets the maximum output of the double-inlet double-outlet coal mill.

[0014] The screw conveyor is sealed to the raw coal bunker compartment A and raw coal bunker compartment B respectively, and the cross-section of the screw conveyor is 500×600mm.

[0015] An infrared camera and a level gauge are installed below the screw conveyor. The infrared camera, level gauge, gate, and screw conveyor are electrically connected, enabling the control system to automatically adjust the drive motor speed and coal flow rate.

[0016] The opening range of gate A and gate B is adjustable. By adjusting the opening range, the coal feed of the screw conveyor can be effectively controlled, thereby achieving the purpose of blending coal in different proportions to meet the real-time changing fuel demand of the unit.

[0017] The beneficial effects of this utility model by adopting the above technical solution are as follows:

[0018] This utility model discloses a raw coal bunker interconnection mechanism for a double-inlet, double-outlet coal mill. By modifying the existing raw coal bunker of the unit, the coal conveying system can precisely blend and burn coal under different load conditions, and adjust the coal blending ratio in real time according to the unit's load requirements. This fully utilizes the characteristics and advantages of different coal types, while taking into account fuel economy, deep peak shaving requirements, and the operational stability requirements of the double-inlet, double-outlet coal mill. This raw coal bunker interconnection mechanism for a double-inlet, double-outlet coal mill integrates gate valves, screw conveyors, level gauges, and infrared cameras for dynamic adjustment of coal flow, significantly improving energy efficiency, reducing fuel costs, and providing a solid guarantee for the long-term stable operation of the unit.

[0019] The present invention will now be described in detail with reference to the accompanying drawings. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the raw coal bunker interconnection mechanism of a double-inlet double-outlet coal mill according to this utility model.

[0021] Figure 2 This is a side view of the raw coal bunker interconnection mechanism of a double-inlet double-outlet coal mill according to this utility model.

[0022] In the diagram: 1-Raw coal bunker A, 2-Partition wall, 3-Raw coal bunker B, 4-Gate gate A, 5-Gate gate B, 6-Screw conveyor, 7-Coal feeder B, 8-Coal feeder A, 9-Double inlet double outlet coal mill, 10-Guide plate. Detailed Implementation

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0024] like Figure 1 As shown, a raw coal bunker interconnection mechanism for a double-inlet double-outlet coal mill is characterized by including a raw coal bunker system, an interconnection coal feeding system, and a double-inlet double-outlet coal mill 9.

[0025] like Figure 1 As shown, the raw coal storage system includes a rectangular raw coal storage unit. A partition wall 2 is installed on the upper part of the rectangular raw coal storage unit, dividing the rectangular raw coal storage unit into two parts: raw coal storage compartment A1 and raw coal storage compartment B3. A gate door A4 is installed in the conical coal hopper at the bottom of raw coal storage compartment A1, and a gate door B5 is installed in the conical coal hopper at the bottom of raw coal storage compartment B3.

[0026] like Figure 1As shown, the interconnected coal feeding system includes a screw conveyor 6 and a guide plate 10 installed below gate A4 and gate B5. The opposite ends of the screw conveyor 6 extend into the lower coal hoppers of raw coal bunker A1 and raw coal bunker B3, respectively. The guide plate 10 is vertically fixed and divides the coal hopper into two parts. The screw conveyor 6 can rotate forward or reverse under the drive of a motor for mutual transfer of coal between the two bunkers.

[0027] like Figure 1 As shown, the interconnected coal feeding system also includes a coal feeder A8 located below the raw coal bunker compartment A1 and a coal feeder B7 located below the raw coal bunker compartment B3. The coal feeders A8 and B7 respectively feed coal to the double-inlet double-outlet coal mill 9.

[0028] In one embodiment of this utility model, the gate A4 and gate B5 are installed at a diameter of 2m in the conical coal hopper of the rectangular raw coal bunker. The gate A4 and gate B5 each include two inclined gates, and their opening and closing directions form a 20° angle with the running direction of the screw conveyor 6.

[0029] In one embodiment of this utility model, the partition wall 2 is arranged along the running direction of the coal conveyor belt. The partition wall 2 includes a rigid beam with a pitch in the range of 1000mm to 1200mm and steel plates fixed on both sides of the rigid beam. The rigid beam can be made of HW250 steel of Q355B material, and the steel plate can be 10mm thick Q235B steel plate. Radar level gauges are respectively installed on both sides of the partition wall 2.

[0030] In one embodiment of this utility model, the guide plate 10 is arranged parallel to the running direction of the screw conveyor 6, and the space on the side where the screw conveyor 6 is located occupies 60% of the overall space below the gate, ensuring smooth coal flow on the side where the screw conveyor 6 is located.

[0031] In one embodiment of this utility model, the raw coal storage compartment A1 stores high-calorific-value coal, and the raw coal storage compartment B3 stores low-calorific-value coal. When the gate A4 is opened and the gate B5 is closed, some of the coal in the raw coal storage compartment A1 directly enters the lower coal feeder A8, and some of the coal falls onto the screw conveyor 6 and is transported to the raw coal storage compartment B3, and then enters the lower coal feeder B7.

[0032] In one embodiment of this utility model, the drive motor of the screw conveyor 6 is located outside the rectangular raw coal bunker, the speed of the drive motor is matched with the speed of the coal feeder, and the maximum coal conveying capacity of the screw conveyor 6 meets the maximum output of the double-inlet double-outlet coal mill 9.

[0033] In one embodiment of this utility model, the screw conveyor 6 is sealed to the raw coal bunker compartment A1 and raw coal bunker compartment B3 respectively, and the cross section of the screw conveyor 6 is 500×600mm.

[0034] In one embodiment of this utility model, an infrared camera and a level gauge are installed below the screw conveyor 6. The infrared camera, level gauge, gate, and screw conveyor 6 are electrically connected, which enables the control system to automatically adjust the speed of the drive motor and the coal conveying flow.

[0035] In one embodiment of this utility model, the opening range of the gate A4 and the gate B5 is adjustable. By adjusting the opening range, the coal feed of the screw conveyor 6 can be effectively controlled, thereby achieving the purpose of blending coal in different proportions to meet the real-time changing fuel demand of the unit.

[0036] In summary, the raw coal bunker interconnection mechanism of the double-inlet double-outlet coal mill of this utility model has the following advantages: The raw coal bunker interconnection mechanism of the double-inlet double-outlet coal mill of this utility model achieves flexible coal blending in the coal conveying system through a screw conveyor. Under different load operating conditions, the control system achieves high-precision control of the blending ratio of different calorific value coal types by adjusting the opening range of the gate and accurately controlling the coal feed rate of the screw conveyor. This effectively avoids problems of insufficient or excessive coal supply caused by human error or operational delay, significantly improving the operational reliability and stability of the coal conveying system, while reducing manual intervention costs and labor intensity. The raw coal bunker interconnection mechanism of the double-inlet double-outlet coal mill of this utility model is flexible in operation and cut-off. When the gate on the screw conveyor side is closed, the presence of the guide plate ensures that the downward coal supply on the other side of the coal hopper is not affected, ensuring the stability of the unit load, minimizing the impact of equipment maintenance on overall operation, and reducing downtime and production losses caused by maintenance.

[0037] The specific embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A raw coal bunker interconnection mechanism for a double-inlet, double-outlet coal mill, characterized in that... Including the raw coal storage system, the interconnected coal feeding system and the double-inlet double-outlet coal mill (9); The raw coal storage system includes a rectangular raw coal storage unit. A partition wall (2) is installed on the upper part of the rectangular raw coal storage unit to divide the rectangular raw coal storage unit into two parts: raw coal storage unit A (1) and raw coal storage unit B (3). A gate door A (4) is installed in the conical coal hopper at the bottom of the raw coal storage unit A (1), and a gate door B (5) is installed in the conical coal hopper at the bottom of the raw coal storage unit B (3). The interconnected coal feeding system includes a screw conveyor (6) and a guide plate (10) installed below gate A (4) and gate B (5). The two ends of the screw conveyor (6) extend into the lower coal hoppers of raw coal bin A (1) and raw coal bin B (3), respectively. The guide plate (10) is vertically fixed and divides the coal hopper into two parts. The screw conveyor (6) can rotate forward or reverse under the drive of a motor for mutual transfer of coal between the two bins. The interconnected coal feeding system also includes a coal feeder A (8) located below the raw coal bunker compartment A (1) and a coal feeder B (7) located below the raw coal bunker compartment B (3). The coal feeder A (8) and the coal feeder B (7) respectively feed coal to the double-inlet double-outlet coal mill (9).

2. The raw coal bunker interconnection mechanism for a double-inlet, double-outlet coal mill according to claim 1, characterized in that... The gate A (4) and gate B (5) are installed at a diameter of 2m in the conical coal hopper of the rectangular raw coal bunker. Gate A (4) and gate B (5) each include two inclined gates, and their opening and closing directions are at an angle of 20° to the running direction of the screw conveyor (6).

3. The raw coal bunker interconnection mechanism for a double-inlet, double-outlet coal mill according to claim 1, characterized in that... The partition wall (2) is set along the running direction of the coal conveyor belt. The partition wall (2) includes a rigid beam with a pitch in the range of 1000mm to 1200mm and steel plates fixed on both sides of the rigid beam. The rigid beam can be made of HW250 steel with Q355B material. The steel plate can be 10mm thick Q235B steel plate. Radar level gauges are set on both sides of the partition wall (2).

4. The raw coal bunker interconnection mechanism for a double-inlet, double-outlet coal mill according to claim 1, characterized in that... The guide plate (10) is arranged parallel to the running direction of the screw conveyor (6). The space on the side where the screw conveyor (6) is located occupies 60% of the overall space below the gate, ensuring smooth coal flow on the side where the screw conveyor (6) is located.

5. The raw coal bunker interconnection mechanism for a double-inlet, double-outlet coal mill according to claim 1, characterized in that... The raw coal storage compartment A (1) stores high-calorific-value coal, and the raw coal storage compartment B (3) stores low-calorific-value coal. When the gate A (4) is opened and the gate B (5) is closed, some of the coal in the raw coal storage compartment A (1) directly enters the lower coal feeder A (8), and some of the coal falls onto the screw conveyor (6) and is transported to the raw coal storage compartment B (3), and then enters the lower coal feeder B (7).

6. The raw coal bunker interconnection mechanism for a double-inlet, double-outlet coal mill according to claim 1, characterized in that... The drive motor of the screw conveyor (6) is located outside the rectangular raw coal bunker. The speed of the drive motor is matched with the speed of the coal feeder. The maximum coal conveying capacity of the screw conveyor (6) meets the maximum output of the double-inlet double-outlet coal mill (9).

7. The raw coal bunker interconnection mechanism for a double-inlet, double-outlet coal mill according to claim 1, characterized in that... The screw conveyor (6) is sealed to the raw coal bunker compartment A (1) and raw coal bunker compartment B (3) respectively, and the cross section of the screw conveyor (6) is 500×600mm.

8. The raw coal bunker interconnection mechanism for a double-inlet double-outlet coal mill according to claim 1, characterized in that... An infrared camera and a level gauge are installed below the screw conveyor (6). The infrared camera, level gauge, gate and screw conveyor (6) are electrically connected, which can realize the automatic adjustment of the drive motor speed and coal conveying flow by the control system.

9. The raw coal bunker interconnection mechanism for a double-inlet double-outlet coal mill according to claim 8, characterized in that... The opening range of the gate A (4) and gate B (5) is adjustable. By adjusting the opening range, the coal feed of the screw conveyor (6) can be effectively controlled, thereby achieving the purpose of blending coal in different proportions to meet the real-time changing fuel demand of the unit.

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