Boiler peak regulation fire coal blending combustion device
By designing a boiler peak-shaving coal blending device, the problem of poor load response of coal-fired power units during grid peak shaving was solved, and rapid coal quality allocation was achieved, which improved coal efficiency and unit flexibility and reduced production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-20
- Publication Date
- 2026-04-24
AI Technical Summary
When existing coal-fired power units are operating under grid peak shaving conditions, load changes are subject to grid dispatch requirements. Existing co-firing devices have poor load response, which affects the unit's peak shaving capacity and load response speed.
Design a boiler peak-shaving coal blending device, including a coal bunker body with a top feed inlet, first and second coal hoppers, and first and second coal feeders. The coal feed rate is controlled by a gate and connected to a DCS system to achieve rapid and flexible blending of different coal qualities.
It enables rapid and flexible coal quality allocation based on changes in unit load and combustion conditions, improving coal combustion efficiency and unit flexibility, meeting peak-shaving operation requirements, and reducing production and operating costs.
Smart Images
Figure CN224162621U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of coal-fired power plant boiler technology, specifically relating to a boiler peak-shaving coal blending device. Background Technology
[0002] The deep peak-shaving capacity of coal-fired power units mainly depends on the boiler's ability to maintain stable combustion at low loads. The main technical measures to improve the boiler's ability to maintain stable combustion at low loads include: burner modification to adapt to flexible peak shaving, pulverizing system modification, blending with high-volatile coal, and combustion-aiding modifications such as plasma, micro-oil, and oxygen enrichment.
[0003] When the load of a coal-fired power unit is high, the boiler furnace temperature is high, the flue gas volume is large, and the combustion stability is good. At this time, if more coal with lower volatile matter and calorific value is added, the production and operation costs can be reduced while ensuring the unit's load-carrying capacity. When the load of a coal-fired power unit is low and close to the minimum stable combustion load without oil injection, the boiler furnace temperature is low, the flue gas volume is small, and the combustion stability is poor. At this time, the coal fed into the furnace needs to have higher volatile matter and calorific value to ensure the boiler combustion stability and prevent unsafe events such as boiler flameout caused by unstable combustion.
[0004] However, when coal-fired power units participate in grid peak shaving, their load changes are subject to grid dispatch requirements, and high or low loads may occur at any time. The existing raw coal bunker structure cannot flexibly blend the coal quality entering the furnace according to the changes in unit load, which affects the unit's peak shaving capacity and load response speed. Utility Model Content
[0005] In view of this, the purpose of this utility model is to provide a boiler peak-shaving coal blending device, which aims to solve the technical problem of poor load response of existing blending devices.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a boiler peak-shaving coal blending device, comprising a coal bunker body with a feed inlet at the top, a first coal hopper and a second coal hopper disposed at the bottom of the coal bunker body, a first coal feeder and a second coal feeder for connecting the first coal hopper and the second coal hopper to adjacent boiler coal bunkers to convey coal of different qualities, and a coal feeder platform for supporting the second coal feeder, wherein a first gate for adjusting the coal feed rate is provided between the first coal feeder and the first coal hopper, and a second gate for adjusting the coal feed rate is provided between the second coal feeder and the second coal hopper.
[0007] Furthermore, the first coal hopper and the second coal hopper contain the same amount of coal.
[0008] Furthermore, the second coal hopper is provided with multiple coal clearing devices spaced apart along its height direction.
[0009] Furthermore, the unblocking device is either an air cannon or an air hammer.
[0010] Furthermore, a transition compartment is provided between the coal bunker body and the first and second coal hoppers.
[0011] Furthermore, the first coal hopper and the second coal hopper are respectively welded to the inner wall of the transition chamber.
[0012] Furthermore, reinforcing ribs are provided between the coal bunker body and the transition chamber.
[0013] Furthermore, the connection end between the transition chamber and the coal bunker body is circular, and the connection end between the transition chamber and the first coal hopper and the second coal hopper is square.
[0014] Furthermore, the first coal feeder and the second coal feeder are respectively connected to the power plant's DCS system.
[0015] Furthermore, the first coal hopper and / or the second coal hopper are provided with observation windows.
[0016] The beneficial effects of this utility model are as follows: Compared with the prior art, the boiler peak-shaving coal blending device of this utility model, by setting up a first coal hopper and a second coal hopper, can realize the blending of coal types under different loads; by setting up a first coal feeder and a second coal feeder, it can realize coal feeding and mixing with the coal bunker of the adjacent boiler, and thus can quickly and flexibly adjust the coal quality according to the changes in unit load and combustion conditions, so as to meet the requirements of peak-shaving capacity and load response speed of coal-fired power units under peak-shaving operation mode; by setting up a first gate and a second gate, the coal feeding and shut-off of the coal feeder can be controlled by themselves to meet the needs of boiler combustion and further improve coal combustion efficiency; this device can realize flexible bidirectional coal blending, providing different types of raw coal for different operating conditions of the unit, greatly meeting the needs of rapid load response and improving the flexibility of the unit.
[0017] Other advantages, objectives, and features of this invention will be set forth in the following description and will be apparent to those skilled in the art to some extent, or may be learned by practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description
[0018] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the following drawings are provided for illustration:
[0019] Figure 1 This is a schematic diagram of the boiler peak-shaving coal blending device according to an embodiment of the present invention;
[0020] Figure 2 This is a schematic diagram showing the connection between the boiler peak-shaving coal blending device and other adjacent boiler coal bunkers according to an embodiment of this utility model.
[0021] Icon labels:
[0022] 1-Coal bunker body;
[0023] 2-First coal hopper;
[0024] 3-Second coal hopper;
[0025] 4-Second coal feeder;
[0026] 5- Coal feeder platform;
[0027] 6-Dredging device;
[0028] 7-Transition Warehouse;
[0029] 8-Reinforcing ribs;
[0030] 9-Observation window;
[0031] 10-Boiler coal bunker. Detailed Implementation
[0032] like Figures 1 to 2 As shown in the figure, this embodiment proposes a boiler peak-shaving coal blending device. The blending device includes a coal bunker body 1 with a feed inlet at the top, and a first coal hopper 2 and a second coal hopper 3 at the bottom of the coal bunker body 1. In addition, the blending device also includes a first coal feeder (not shown in the figure), a second coal feeder 4, and a coal feeder platform 5. The first coal feeder can connect the first coal hopper 2 to the adjacent boiler coal bunker, and the second coal feeder 4 can connect the second coal hopper 3 to the adjacent boiler coal bunker 10. The coal feeder platform 5 can be used to support the second coal feeder 4. A first gate is provided between the first coal feeder and the first coal hopper 2, and a second gate is provided between the second coal feeder 4 and the second coal hopper 3. By setting up a first coal hopper 2 and a second coal hopper 3, coal blending under different loads can be achieved; by setting up a first coal feeder and a second coal feeder 4, coal storage between the feeder and the adjacent boiler coal bunker 10 can be achieved, thus enabling rapid and flexible allocation of coal quality according to changes in unit load and combustion conditions, to meet the requirements of peak-shaving capacity and load response speed of coal-fired power units under peak-shaving operation mode; by setting up a first gate and a second gate, the coal feeding and shut-off of the feeders can be controlled respectively to meet the needs of boiler combustion and further improve coal combustion efficiency; this device can achieve flexible bidirectional coal blending, providing different types of raw coal for different operating conditions of the unit, greatly meeting the needs of rapid load response and improving the flexibility of the unit.
[0033] In this application, please refer to Figure 2. The packing material in the coal bunker body 1 can be low-calorific-value coal or high-calorific-value coal. When the coal bunker body 1 in this application is low-calorific-value coal, the packing material in the adjacent boiler coal bunker 10 is high-calorific-value coal. The transmission of different types of coal is achieved through the first coal feeder and the second coal feeder 4. When the boiler units are all at full load, the first coal feeder and the second coal feeder 4 are started to use high-calorific-value coal to ensure the load-carrying capacity of the units. When the boiler units are all running at medium and low loads, the first coal feeder and the second coal feeder are shut down, and the original coal bunker 10 is used to store low-calorific-value coal pulverizing system to ensure the demand for burning low-calorific-value coal under low-load operating conditions of the units and reduce production and operating costs.
[0034] Preferably, the first coal hopper 2 and the second coal hopper 3 have the same weight. This ensures balanced stress distribution at both ends of the coal bunker body 1, preventing tilting or damage due to uneven stress and improving the stability and service life of the entire co-firing device. Furthermore, the equal weight of the coal hoppers also helps achieve more uniform coal blending, further enhancing combustion efficiency and boiler operational stability.
[0035] Further, please refer to Figure 2 As shown, the second coal hopper 3 is equipped with multiple unblocking devices 6 along its height. These devices effectively prevent coal from clogging or accumulating within the hopper, ensuring smooth coal flow. These devices promptly clear blockages, guaranteeing the normal operation of the coal hopper and improving the continuity and stability of coal blending. Preferably, the unblocking device 6 is either an air cannon or an air hammer. In this application, the air cannon uses the impact force generated by the instantaneous release of high-pressure air to effectively break up blocked coal, allowing it to flow again; while the air hammer vibrates the coal through periodic striking motions, preventing it from sticking together due to prolonged stillness. Both unblocking devices have the advantages of simple structure, convenient operation, and low maintenance costs, and demonstrate good unblocking effects in practical applications. Furthermore, depending on different coal characteristics and operating environments, operators can flexibly choose to use an air cannon or an air hammer, or alternate between the two, to achieve the best unblocking effect.
[0036] Further, please refer to Figure 1As shown, a transition chamber 7 is provided between the coal bunker body 1 and the first coal hopper 2 and the second coal hopper 3. By setting up the transition chamber 7, it is possible for the coal in the coal bunker body 1 to enter the adjacent pulverizing system. Furthermore, the transition chamber 7 allows the coal in the coal bunker body 1 to first enter the transition chamber 7, and then be distributed to the first coal hopper 2 or the second coal hopper 3 as needed. This design not only makes the coal distribution more flexible, but also ensures the uniformity of the coal during the distribution process, avoiding combustion instability caused by uneven coal distribution; at the same time, the transition chamber 7 also acts as a buffer, reducing the direct impact of the coal on the coal hoppers and extending the service life of the coal hoppers.
[0037] Preferably, the first coal hopper 2 and the second coal hopper 3 are welded to the inner wall of the transition chamber 7, respectively. This welding connection not only improves the connection strength between the coal hoppers and the transition chamber 7, ensuring structural stability and safety, but also avoids coal leakage caused by loose or detached connections. This connection method has the advantages of simple process, low cost, and reliable connection, and is suitable for various working conditions and environments. Furthermore, the welding connection reduces the gap between the coal hoppers and the transition chamber 7, further improving the sealing performance and storage efficiency of the coal.
[0038] Further, please refer to Figure 1 As shown, a reinforcing rib 8 is provided between the coal bunker body 1 and the transition chamber 7. By providing the reinforcing rib 8, the connection strength and stability between the coal bunker body 1 and the transition chamber 7 can be further improved, preventing structural deformation or damage caused by excessive coal weight or vibration during operation.
[0039] Preferably, the connection end between the transition chamber 7 and the coal bunker body 1 is circular, and the connection end between the transition chamber 7 and the first coal hopper 2 and the second coal hopper 3 is square. By setting the transition chamber 7 to a structure similar to a round heaven and a square earth, coal blockage is effectively prevented. Of course, in this application, the structure of the transition chamber 7 can also be set to other structures according to actual conditions and specific needs, and is not limited here.
[0040] Preferably, the first and second coal feeders 4 are connected to the power plant's DCS system. During actual operation, operators can remotely control and monitor the first and second coal feeders 4 through the DCS system. The DCS system can collect real-time operating data of the coal feeders, such as coal feed rate and motor current, and automatically adjust the operating parameters of the coal feeders according to changes in unit load and combustion conditions, thereby achieving rapid and flexible coal quality allocation. This automated control method greatly improves the operating efficiency of the co-firing device, enabling rapid and flexible coal quality allocation and enhancing the unit's peak-shaving capacity and load response speed.
[0041] Furthermore, the first coal hopper 2 and / or the second coal hopper 3 are provided with observation windows 9. By providing observation windows 9, the remaining amount of coal blocks, coal slurry, and sludge in the inner cavity of the first coal hopper 2 and / or the second coal hopper 3 can be observed in real time, facilitating timely replenishment.
[0042] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.
Claims
1. A boiler peak-shaving coal blending device, characterized in that, The system includes a coal bunker body with a feed inlet at the top, a first coal hopper and a second coal hopper located at the bottom of the coal bunker body, a first coal feeder and a second coal feeder for connecting the first coal hopper and the second coal hopper to adjacent boiler coal bunkers to transport coal of different qualities, and a coal feeder platform for supporting the second coal feeder. A first gate for adjusting the coal feed rate is provided between the first coal feeder and the first coal hopper, and a second gate for adjusting the coal feed rate is provided between the second coal feeder and the second coal hopper.
2. The boiler peak-shaving coal blending device according to claim 1, characterized in that, The first coal hopper and the second coal hopper have the same amount of coal.
3. The boiler peak-shaving coal blending device according to claim 1, characterized in that, The second coal hopper is provided with multiple coal clearing devices spaced apart along its height.
4. A boiler peak-shaving coal blending device according to claim 3, characterized in that, The unblocking device is either an air cannon or an air hammer.
5. A boiler peak-shaving coal blending device according to claim 1, characterized in that, A transition compartment is provided between the main body of the coal bunker and the first and second coal hoppers.
6. A boiler peak-shaving coal blending device according to claim 5, characterized in that, The first coal hopper and the second coal hopper are respectively welded to the inner wall of the transition chamber.
7. A boiler peak-shaving coal blending device according to claim 5, characterized in that, The coal bunker body and the transition chamber are provided with reinforcing ribs.
8. A boiler peak-shaving coal blending device according to claim 5, characterized in that, The connection end between the transition chamber and the main body of the coal bunker is circular, and the connection end between the transition chamber and the first coal hopper and the second coal hopper is square.
9. A boiler peak-shaving coal blending device according to claim 1, characterized in that, The first coal feeder and the second coal feeder are respectively connected to the power plant's DCS system.
10. A boiler peak-shaving coal blending device according to claim 1, characterized in that, The first coal hopper and / or the second coal hopper are provided with observation windows.