Separated coal feeding device for raw coal bunker
By designing the coal-splitting device for the original coal silo, and using technologies such as screw conveyors and feeder, the poor adaptability and transmission blockage of coal-fired power plants' boilers under peak-shaving demands are solved, and the boiler's stable combustion and power grid are achieved stable electricity use.
Patent Information
- Application Number
- CN202421139917.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-05-23
AI Technical Summary
Under the demand for peak shaving, the boiler has poor adaptability to coal types, and it is difficult to stabilize combustion at low loads, and it is difficult to peak at high loads. The existing technology is difficult to effectively solve the problem of coal types transport blockage, affecting the stable operation of the boiler.
Design a coal feeding device for the raw coal bin, through the interconnection of two adjacent raw coal bins, set up feeder and buffer channels, and use jet heads to prevent coal bins and jams, so as to achieve flexible coal blending Burn and convey.
It realizes stable combustion of the boiler at low peaks and peaks, improves the peak-shaving capacity and accident handling capacity of the unit, avoids coal blockage, and ensures stable power demand of the power grid.
Smart Images
Figure CN222352362U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of coal supply for boilers in thermal power plants, in particular to a raw coal bunker coal supply device. Background Art
[0002] Due to the rapid increase in renewable energy power generation, the power generation share of coal-fired power plants has been squeezed. Coal-fired power plants have been transformed from base load power sources to peak load power sources. The load adjustment range is relatively large. They need to perform deep peak adjustment when renewable energy is in large quantities, and they need to handle high loads when renewable energy is insufficient to meet the stability requirements of the power grid. At the same time, due to the high price of coal, coal-fired power plants all use low calorific value and low volatility coal to reduce costs. Except for a bottom-level pulverizer that uses high volatility and high calorific value coal to meet the boiler's stable combustion requirements, the remaining pulverizers all use economic coal. The low-load boiler has poor stable combustion and it is difficult to peak at high loads. It has poor adaptability to the growing peak-shaving requirements. Utility Model Content
[0003] In order to solve the above technical problems, the utility model specifically adopts the following technical solutions.
[0004] A raw coal bunker coal feeding device is designed, comprising two adjacent raw coal bunkers, wherein a coal dropping pipe, a buffer channel and a coal feeder are respectively connected in sequence to the bottom of each raw coal bunker, a gate valve is provided at the upper part of the coal dropping pipe, and screw conveyors are respectively connected to the lower parts of the side walls opposite to each other of the two raw coal bunkers, the two screw conveyors are cross-arranged front and rear, and the outlet ends are connected to the corresponding coal dropping pipes, and a material dispenser is provided in the coal dropping pipe below the outlet of the screw conveyor.
[0005] Preferably, the raw coal bin is arranged in a funnel shape.
[0006] Preferably, a connecting rod is fixed on the inner wall of the screw conveyor at the outlet, and the end of the screw shaft of the screw conveyor is rotatably connected to the connecting rod.
[0007] Preferably, the material selector comprises a rotating shaft which is longitudinally rotatable in the coal dropping pipe and a plurality of material selector plates which are distributed in an array on the rotating shaft. One end of the rotating shaft rotates to extend out of the coal dropping pipe and is connected to a driving motor.
[0008] Preferably, a plurality of buffer protrusions are provided on the bottom wall of the buffer channel.
[0009] Preferably, an injection head is provided between two adjacent buffer protrusions, an injection disc is provided on the bottom wall outside the buffer channel, and an air intake pipe is connected to the injection disc.
[0010] Preferably, the spray head is arranged to be inclined downward.
[0011] The beneficial effects of the utility model are:
[0012] 1. The utility model interconnects the raw coal bunkers of adjacent bottom-level coal mills through a screw conveyor, thereby realizing the mutual blending of coal types in the raw coal bunkers of the two boilers, meeting the requirements of stable combustion of boilers during low peak hours, peak demand of boilers during peak hours, and stable combustion requirements in the event of boiler accidents under existing conditions, and the conveying method of the screw conveyor can avoid the occurrence of blockage during coal transportation.
[0013] 2. The utility model arranges a material-shifting plate in the coal-dropping pipe, which can prevent the coal transported by the screw conveyor and the coal dropped from the raw coal bin from being dropped at the same time and causing the coal to be blocked in the drop pipe under the drive of the driving motor. Moreover, the arrangement of the buffer protrusion in the buffer channel can reduce the impact force of the coal blocks directly falling on the conveying belt of the coal feeder, thereby playing a buffering and protective role for the conveying belt. In order to prevent the coal from being stuck in the low-lying area between two adjacent protrusions, a jet head is also arranged between the two adjacent protrusions to provide power to the stuck coal so that it can drop quickly.
[0014] 3. In short, the utility model can also improve the peak and peak-shaving capabilities of the unit, improve the accident handling capability of unstable boiler combustion, ensure the flexible blending and adjustment of boiler fuel, realize the differentiated electricity consumption needs during peak and valley periods, and ensure the stability of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0016] Figure 2 yes Figure 1 A is an enlarged structural diagram;
[0017] The numbers in the figure are: 1 raw coal bin, 2 gate valve, 3 coal drop pipe, 4 rotating shaft, 5 material stripper plate, 6 buffer channel, 7 air inlet pipe, 8 jet disc, 9 buffer protrusion, 10 screw conveyor, 11 coal feeder, 12 connecting rod, 13 screw shaft, 14 jet head. DETAILED DESCRIPTION
[0018] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.
[0019] Example 1
[0020] A raw coal bunker coal feeding device, such as Figure 1 to Figure 2As shown, it includes two adjacent raw coal bins 1, which are arranged in a funnel shape. The bottom of each raw coal bin 1 is connected with a coal drop pipe 3, a buffer channel 6, and a coal feeder 11 in sequence. The coal feeder 11 supplies coal to its corresponding coal mill. A gate valve 2 is provided at the upper part of the coal drop pipe 3. Screw conveyors 10 are connected to the lower part of the opposite side walls of the two raw coal bins 1. The two screw conveyors 10 are arranged crosswise in front and back, and the outlet ends are connected to the corresponding coal drop pipes 3. A connecting rod 12 is fixed at the outlet on the inner wall of the screw conveyor 10, and the end of the screw shaft 13 of the screw conveyor 10 is rotatably connected to the connecting rod 12. The arrangement of the screw conveyors 10 at the two intersections can realize the mutual combustion of coal types in the two raw coal bins 1, thereby improving the peak and peak-shaving capabilities of the unit and ensuring the flexible combustion and adjustment of boiler fuel.
[0021] A material shifter is provided in the coal drop pipe 3 below the outlet of the screw conveyor 10. The material shifter includes a rotating shaft 4 arranged in the coal drop pipe 33 and a plurality of material shifting plates 5 arranged in an array on the rotating shaft 4. One end of the rotating shaft 4 rotates and extends out of the coal drop pipe 33 and is connected to a driving motor. The driving motor drives the material shifting plates 5 on the rotating shaft 4 to rotate, thereby preventing the coal drop pipe 3 from being blocked.
[0022] Furthermore, in order to reduce the direct fall of coal in the coal drop pipe 33 and to reduce the impact on the conveyor belt of the coal feeder below, a plurality of buffer bumps are provided on the bottom wall of the buffer channel 6 .
[0023] Furthermore, in order to prevent the coal from being stuck between two adjacent protrusions 9, an air jet 14 is provided between two adjacent buffer protrusions 9, and the air jet 14 is tilted downward, and the downward tilted air jet 14 can prevent being blocked by the coal. An air jet disc 8 is provided on the bottom wall outside the buffer channel 6, and an air intake pipe 7 is connected to the air jet disc 8, and the air intake pipe 7 is connected to the air source.
[0024] In the utility model, when the high-quality long-smoke coal in one of the raw coal bins is supplied to the coal drop pipe of another raw coal bin through a screw conveyor, the other raw coal bin contains high-quality coal. At this time, the gate valve on the other coal drop pipe is opened to allow the two types of coal to be mixed with each other. The mixed coal passes through the buffer channel and the coal feeder in turn, and is then transported to the coal mill to achieve mutual blending of the two types of coal, thereby achieving stable combustion of the boiler under deep peak-shaving conditions of the unit to obtain peak-shaving benefits, and can also meet the requirements of rapid top load when peak load is needed; similarly, when the economical coal in one of the raw coal bins is selected and transported to the coal drop pipe under the other raw coal bin through a screw conveyor, the economic blending of the boiler in the other raw coal bin under non-peak-shaving and peak conditions can be met. At the same time, when a bottom-layer mill of the unit fails for maintenance or the boiler combustion is unstable, the requirements of stable combustion in accident situations can be met.
[0025] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.
Claims
1. A coal feeding device for raw coal bunker, characterized in that: The invention comprises two adjacent raw coal bins (1), wherein the bottom of each raw coal bin (1) is respectively connected with a coal dropping pipe (3), a buffer channel (6), and a coal feeder (11), a gate valve (2) is provided at the upper part of the coal dropping pipe (3), and screw conveyors (10) are respectively connected at the lower part of the side walls opposite to each other of the two raw coal bins (1), the two screw conveyors (10) are arranged crosswise at the front and rear, and the outlet ends are connected with the corresponding coal dropping pipes (3), and a material distributor is provided in the coal dropping pipe (3) below the outlet of the screw conveyor (10).
2. The raw coal bunker (1) coal feeding device according to claim 1, characterized in that: The raw coal bin (1) is arranged in a funnel shape.
3. The device for feeding coal into a raw coal bunker (1) according to claim 1, characterized in that: A connecting rod (12) is fixed on the inner wall of the screw conveyor (10) at the outlet, and the end of the screw shaft (13) of the screw conveyor (10) is rotatably connected to the connecting rod (12).
4. The device for feeding coal into a raw coal bunker (1) according to claim 1, characterized in that: The material selector comprises a rotating shaft (4) arranged in a longitudinally rotatable manner in a coal dropping pipe (3) (3) and a plurality of material selector plates (5) arranged in an array on the rotating shaft (4); one end of the rotating shaft (4) is rotatably extended out of the coal dropping pipe (3) (3) and is connected to a driving motor.
5. The device for feeding coal into a raw coal bunker (1) according to claim 1, characterized in that: A plurality of buffer protrusions are provided on the bottom wall of the buffer channel (6).
6. The device for feeding coal into a raw coal bunker (1) according to claim 5, characterized in that: An injection head (14) is provided between two adjacent buffer protrusions (9), an injection disc (8) is provided on the bottom wall outside the buffer channel (6), and an air intake pipe (7) is connected to the injection disc (8).
7. The device for feeding coal into a raw coal bunker (1) according to claim 6, characterized in that: The spray head (14) is arranged to be inclined downward.