A flexible coal blending device for coal-fired power plants
Patent Information
- Application Number
- CN202521103073.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-30
- Publication Date
- 2026-09-11
- Estimated Expiration
- 2035-05-30
AI Technical Summary
[0003]然而在实际运行中存在以下问题：首先是由于优质煤与劣质煤的排煤量不同，隔板两侧的煤位高度难以保持一致，导致隔板两侧受力不均，存在煤位失衡与载重不均的问题
[0016]与现有技术相比本实用新型的有益效果是：本实用新型通过设置两个储煤仓及对应的分料仓，形成独立的双通道供煤系统。各储煤仓通过分料仓的排料阀控制煤种输出，经输煤机构输送至配煤机构，实现不同煤种的分流或混合。双通道设计允许同时处理两种煤源，显著提升配煤效率及灵活性。当一侧储煤仓检修或故障时，可通过分料仓维持持续供煤，确保配煤作业不间断，进一步保障系统运行的可靠性，避免因煤源中断导致停机。本实用新型中双储煤仓与分料仓的协同设计，通过分路控制、动态调配及冗余保障，解决了传统单一路径配煤灵活性不足的问题，实现了高效、精准、稳定的燃煤供应。
Smart Images
Figure CN224736201U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of coal conveying equipment technology, and in particular to a flexible coal blending device for coal-fired power plants. Background Technology
[0002] To meet the requirements of electricity market regulation and ensure the fundamental interests of power plants, generating units need to have deep peak-shaving capabilities to meet electricity demand at different times. Since the combustion capacity and price difference of different coal qualities vary greatly, in order to save costs, low-quality coal or a mixture of high-quality and low-quality coal is generally used for production during off-peak or flat-peak periods, while high-quality coal is used during peak periods. In existing technologies, partitions are usually installed in the middle of the coal bunker to separate the internal space of the coal bunker, so as to achieve the purpose of storing coal of different qualities separately.
[0003] However, the following problems exist in actual operation: First, due to the different discharge rates of high-quality and low-quality coal, the coal level on both sides of the baffle is difficult to maintain uniformity, resulting in uneven stress on both sides of the baffle and problems of coal level imbalance and uneven load. Under long-term operation, the baffle may deform or even be structurally damaged due to excessive coal pressure on one side, affecting the overall stability of the coal bunker. After the baffle deforms, the effective coal storage space of the coal bunker will be squeezed, leading to a decrease in coal flowability and easy blockage near the coal discharge port, affecting the continuous transportation of coal. Frequent baffle correction or replacement will increase equipment maintenance costs, and shutdowns for maintenance due to coal bunker blockage will also reduce the unit's operating efficiency.
[0004] Secondly, traditional systems have difficulty in flexibly switching and mixing different types or qualities of coal, and cannot dynamically adjust the coal quality according to the boiler's combustion needs, resulting in unstable combustion efficiency or fluctuations in environmental indicators. If a coal storage silo malfunctions or needs maintenance, the system lacks a backup coal supply path, which may lead to coal supply interruption and affect the continuous operation of the power plant.
[0005] Therefore, there is an urgent need for a flexible coal blending device for coal-fired power plants that can ensure the stability of the coal bunker structure, improve the efficiency of coal transportation, and achieve flexible blending of different coal types. Utility Model Content
[0006] The purpose of this invention is to provide a flexible coal blending device for coal-fired power plants, which can not only ensure the stability of the coal bunker structure and improve the coal conveying efficiency, but also realize the flexible blending of different coals to improve the operating efficiency and reliability of coal-fired power plants.
[0007] The present invention adopts the following technical solution: A flexible coal blending device for a coal-fired power plant includes two coal storage bins. Each coal storage bin has a distribution bin on one side. Each distribution bin and the coal storage bin are equipped with a discharge valve. A coal conveying mechanism is installed below the discharge valve of each distribution bin. The discharge ports of both coal conveying mechanisms are connected to the coal blending mechanism. The discharge ports of the coal blending mechanism and the corresponding coal storage bins are connected to the same coal feeder.
[0008] Preferably, the coal conveying mechanism is a motor-driven screw conveyor.
[0009] Preferably, the coal blending mechanism includes a receiving hopper, a guide pipe is provided at the bottom of the receiving hopper, and two distribution pipes are provided at the bottom of the guide pipe. The coal blending mechanism is connected to the corresponding coal feeder through the distribution pipes.
[0010] Preferably, a motor-driven mixing paddle is installed inside the guide pipe.
[0011] Preferably, a sealing plate is provided inside the guide pipe, and the sealing plate can be switched inside the guide pipe to seal different distribution pipes respectively.
[0012] Preferably, each of the feeding tubes is equipped with a motor-driven loosening blade.
[0013] Preferably, two loosening blades are arranged at intervals along the length of the dispensing pipe.
[0014] Preferably, the two material distribution bins are located on one side of the two coal storage bins that are close to each other.
[0015] Preferably, the discharge valve is a hydraulic slide gate valve.
[0016] Compared with existing technologies, the advantages of this utility model are as follows: This utility model forms an independent dual-channel coal supply system by setting up two coal storage silos and corresponding distribution silos. Each coal storage silo controls the coal type output through the discharge valve of the distribution silo, and the coal is transported to the coal blending mechanism via the coal conveying mechanism, realizing the diversion or mixing of different coal types. The dual-channel design allows for the simultaneous processing of two coal sources, significantly improving coal blending efficiency and flexibility. When one coal storage silo is under maintenance or malfunctions, continuous coal supply can be maintained through the distribution silo, ensuring uninterrupted coal blending operations, further guaranteeing the reliability of system operation, and avoiding downtime due to coal source interruption. The collaborative design of the dual coal storage silos and distribution silos in this utility model, through branch control, dynamic allocation, and redundancy protection, solves the problem of insufficient flexibility in traditional single-path coal blending, achieving efficient, accurate, and stable coal supply.
[0017] Meanwhile, a distribution bin is set up on one side of the coal storage bin, which can achieve diversion on one side of the coal storage bin. This avoids the problem of deformation and structural damage to the coal storage bin caused by the different discharge volumes of two different coal types, which is caused by directly setting up partitions inside the coal storage bin. This ensures the structural strength of the coal storage bin and also avoids the problem of blockage when coal falls due to deformation of the coal storage bin. Attached Figure Description
[0018] Fig. 1 This is a front view of an embodiment of this application; Fig. 2 This is a schematic diagram of the internal structure of the coal blending mechanism in an embodiment of this application. Detailed Implementation
[0019] The present invention will now be described clearly and completely with reference to the accompanying drawings and embodiments: like Figs. 1-2 As shown, the flexible coal blending device for a coal-fired power plant according to this utility model includes two coal storage bins 1, which are used to store high-quality coal and low-quality coal respectively. Each coal storage bin 1 has a distribution bin 2 on one side. The two distribution bins 2 are preferably located on the side of the two coal storage bins 1 that are close to each other. Each distribution bin 2 and each coal storage bin 1 is equipped with a discharge valve 3. The discharge valve 3 is a hydraulic slide valve, which is convenient to open to discharge coal. Each distribution bin 2 has a coal conveying mechanism 4 below the discharge valve 3. The discharge ports of the two coal conveying mechanisms 4 are connected to the coal blending mechanism. The discharge port of the coal blending mechanism and the corresponding coal storage bin 1 are connected to the same coal feeder. The coal feeder is a device well known to those skilled in the art and is not shown in the figure. During operation, when different coal qualities need to be used separately, the hydraulic gate valve on the coal storage silo 1 containing high-quality or low-quality coal is opened individually, allowing the coal to be discharged into the corresponding coal feeder, which then transports it to the combustion equipment. When two different coal qualities need to be mixed, the hydraulic gate valves on the two distribution silos 2 are opened, and the coal conveying mechanism 4 is activated simultaneously. The coal of different qualities in the two distribution silos 2 is mixed by the coal blending mechanism and then transported to the two coal feeders. The two coal feeders achieve the transportation of mixed coal, greatly improving the efficiency of coal transportation and the operating efficiency of the power plant. When the coal storage silo 1 malfunctions, the distribution silos 2 can also serve as backup coal silos, enhancing the practicality of this invention.
[0020] In addition, the distribution bin 2 is set on one side of the coal storage bin 1, which can avoid the deformation and structural damage of the coal storage bin 1 caused by the different discharge volumes of two different coal materials, thus ensuring the structural strength of the coal storage bin 1. It also avoids the problem of blockage when coal falls due to deformation of the coal storage bin 1.
[0021] Furthermore, in this embodiment, the coal conveying mechanism 4 can be conveyed by a conveyor belt or a screw conveyor. In this embodiment, a motor-driven screw conveyor is preferred. The screw conveyor can reduce the probability of coal blockage by disturbing the coal during the conveying process.
[0022] Furthermore, the coal blending mechanism includes a receiving hopper 5, with the discharge port of the screw conveyor located above the receiving hopper 5. A guide pipe 6 is installed at the bottom of the receiving hopper 5, and two distribution pipes 7 are installed at the bottom of the guide pipe 6. The coal blending mechanism is connected to the corresponding coal feeder through the distribution pipes 7. Preferably, a motor-driven mixing paddle 8 is installed inside the guide pipe 6 to mix and stir the coal entering the receiving hopper 5, improving the uniformity of the mixture of high-quality and low-quality coal and ensuring combustion efficiency. In addition, a sealing plate 9 is installed inside the guide pipe 6, hinged between the two distribution pipes 7 and movably located within the guide pipe 6. The sealing plate 9 is controlled by a motor installed on the guide pipe 6. The motor drives the sealing plate 9 to rotate, enabling the sealing plate 9 to switch between the two distribution pipes 7 and seal different distribution pipes 7. Thus, depending on the production situation of the coal-fired power plant, during off-peak electricity consumption periods, the mixed coal can be transported by a single coal feeder, reducing production costs.
[0023] Each distribution pipe 7 is equipped with a motor-driven loosening blade 10. The loosening blade 10 loosens the coal and reduces the probability of coal blockage in the distribution pipe 7. Two loosening blades 10 are arranged at intervals along the length of the distribution pipe 7 to ensure smooth coal flow.
Claims
1. A flexible coal blending device for a coal-fired power plant, comprising two coal storage bins, characterized in that: Each of the aforementioned coal storage bins has a distribution bin on one side, and each distribution bin and the coal storage bin is equipped with a discharge valve. Below the discharge valve of each distribution bin is a coal conveying mechanism, and the discharge ports of both conveying mechanisms are connected to a coal blending mechanism. The discharge ports of the coal blending mechanism and the corresponding coal storage bins are connected to the same coal feeder. The coal blending mechanism includes a receiving hopper, with a guide pipe at the bottom of the receiving hopper. Two distribution pipes are located at the bottom of the guide pipe, and the coal blending mechanism is connected to the corresponding coal feeder through the distribution pipes. A motor-driven mixing paddle is installed inside the guide pipe. A sealing plate is installed inside the guide pipe, and the sealing plate can switch between sealing different distribution pipes within the guide pipe.
2. The flexible coal blending device for coal-fired power plants according to claim 1, characterized in that: The coal conveying mechanism is a motor-driven screw conveyor.
3. The flexible coal blending device for coal-fired power plants according to claim 1, characterized in that: Each of the aforementioned feed tubes is equipped with a motor-driven loosening blade.
4. The flexible coal blending device for coal-fired power plants according to claim 3, characterized in that: Two loosening blades are arranged at intervals along the length of the dispensing pipe.
5. The flexible coal blending device for coal-fired power plants according to claim 1, characterized in that: The two material distribution bins are located on the same side of the two coal storage bins.
6. The flexible coal blending device for coal-fired power plants according to claim 1, characterized in that: The discharge valve is a hydraulic slide gate valve.