Intelligent coal blending device of coal-fired power plant and use method of intelligent coal blending device

Abstract

The invention provides an intelligent coal blending device of a coal-fired power plant and a use method thereof, the intelligent coal blending device comprises a coal adding mechanism, a conveying mechanism and a mixing mechanism, the coal adding mechanism is used for extracting coal from a coal storage bunker and conveying the coal to a mixing bunker for proportioning; the conveying mechanism is arranged below the coaling mechanism, and the mixing mechanism slides along the upper surface of the conveying mechanism; and the mixing mechanism is used for mixing different coal types so as to ensure that heat of the coal types is uniformly released in the combustion process. Through the arrangement of the mixing mechanism, coal in the mixing bin is weighed when the mixing bin passes through the lower portion of each coal adding mechanism, and the coal outlet in the bottom of the coal storage bin is closed according to the preset proportion when the newly-added weight reaches the standard, so that coal is weighed during coal blending, and compared with a conventional mode, the matching is more accurate, and the coal blending efficiency is improved. And in the sliding process of the mixing bin, different coals can be mixed, so that during combustion, the released heat is more balanced, and the use is more convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of coal blending equipment for coal-fired power plants, and in particular to an intelligent coal blending device for coal-fired power plants and a method for using the same. Background Art

[0002] When coal-fired power plants produce electricity, they often need to use coal with different calorific values ​​(low calorific value coal and high calorific value coal) to adjust the power generation and further adjust the load of the power grid. Low calorific value coal is often used for daily adjustment of power generation costs due to its low price, but its heat release fluctuates greatly; high calorific value coal is relatively expensive, but can provide stable heat. Existing coal proportioning devices mostly rely on manual operation, and there are problems such as inaccurate proportioning and uneven mixing of coal types, which leads to large fluctuations in heat during the combustion process, affecting the operating efficiency and combustion stability of the power plant. In order to effectively solve these problems, it is necessary to design an intelligent coal blending device to ensure a more balanced heat release during the combustion process by accurately proportioning and mixing different types of coal. Summary of the invention

[0003] The purpose of the present invention is to provide an intelligent coal blending device for a coal-fired power plant and a method for using the same, which can improve the operating efficiency of the coal-fired power plant and reduce heat fluctuations during the combustion process according to the load demand of the power grid by accurately proportioning and mixing low calorific value coal and high calorific value coal, thereby optimizing the power generation cost and improving the efficiency of coal use.

[0004] According to one purpose of the present invention, the present invention provides an intelligent coal blending device for a coal-fired power plant, comprising a coal adding mechanism, a conveying mechanism and a mixing mechanism, wherein the coal adding mechanism is used to extract coal from a coal storage bin and convey it to a mixing bin for blending; the conveying mechanism is arranged below the coal adding mechanism, and the mixing mechanism is made to slide along the upper surface of the conveying mechanism; the mixing mechanism is used to mix different types of coal to ensure uniform heat release of the coal during combustion.

[0005] Furthermore, the coal feeding mechanism includes a coal storage bin, an opening and closing box, a baffle, a screw, a first motor and a controller. The first motor controls the baffle through the screw to open and close the opening and closing box, thereby controlling the quantitative feeding of the coal storage bin.

[0006] Furthermore, the controller is connected to the first motor signal, and controls the sliding of the baffle in the opening and closing box by controlling the forward or reverse rotation of the first motor, thereby realizing the opening or closing of the bottom of the coal storage bin.

[0007] Furthermore, the mixing mechanism includes a mixing bin, a connecting plate and a supporting plate are provided at the bottom of the mixing bin, the connecting plate is rotatably connected to the mixing bin via a cylinder, a weight sensor is provided between the supporting plate and the connecting plate, the weight sensor is used to monitor the weight of the coal in the mixing bin and feed back the weight information to the controller, and the controller adjusts the amount of coal added according to the weight information; a stirring member is rotatably connected in the mixing bin, and the stirring member mixes different types of coal by slowly rotating to ensure uniform mixing of the coal types.

[0008] Furthermore, the stirring member is driven by a third motor, and the third motor drives the stirring member to rotate through a third synchronous wheel and a third synchronous belt to evenly mix the coal.

[0009] Furthermore, the conveying mechanism includes a slide rail and a second motor, a sliding block is fixedly connected to the bottom of the mixing bin, and the slide rail and the sliding block cooperate with the second motor to drive the sliding block on the slide rail to move, so that the mixing bin can slide along the slide rail.

[0010] Furthermore, a fixed block is fixed at the bottom of the support plate, the second motor drives the first synchronous wheel, drives the second synchronous wheel through the first synchronous belt, and then drives the fixed block to move through the second synchronous belt, and the fixed block drives the support plate to slide along the slide rail.

[0011] According to the second object of the present invention, the present invention provides a method for using the intelligent coal blending device of the above-mentioned coal-fired power plant, comprising the following steps:

[0012] S1, the mixing bin slides along the slide rail. When the mixing bin moves to the bottom of the coal storage bin, the bottom of the coal storage bin is opened through the controller, so that the coal in the coal storage bin can enter the mixing bin and add coal to the mixing bin;

[0013] S2. During the coal adding process, the weight sensor detects the weight of the mixing bin. When the weight reaches a preset value, a signal is sent and the controller closes the bottom of the coal storage bin. Repeating this operation allows multiple types of coal to be added to the mixing bin according to a preset ratio.

[0014] S3. When the mixing bin slides along the slide rail, the stirring element is rotated slowly to mix the various types of coal in the mixing bin, so that when the proportioned coal is burned, the fluctuation range of heat released is smaller;

[0015] S4. When the mixing bin moves along the slide rail to the coal unloading position, the mixing bin discharges the proportioned and mixed coal for use in the boiler of the coal-fired power plant. Then the mixing bin is reset along the slide rail and proportioning can be performed again.

[0016] Furthermore, the controller is connected with the weight sensor signal. During the coal proportioning process, the controller automatically adjusts the amount of coal added according to the signal of the weight sensor to make the coal proportioning more accurate.

[0017] Furthermore, the conveying mechanism adjusts the load according to the grid demand and accurately controls the position of the mixing bin to timely add and mix the coal types.

[0018] The technical solution of the present invention is to weigh the weight of the coal in the mixing bin when the mixing bin passes under each coal adding mechanism through the setting of the mixing mechanism, and close the coal outlet at the bottom of the coal storage bin when the newly added weight reaches the standard according to the preset proportioning ratio, so that the coal can be weighed when blending. Compared with the conventional method, the proportioning is more accurate. Different coals can be mixed during the sliding of the mixing bin, so that the heat released during combustion is more balanced and easier to use. Through automatic control and precise proportioning, the accuracy of coal proportioning is improved, ensuring that the combustion process of the coal-fired power plant is more stable and the heat release is more uniform, thereby effectively reducing combustion fluctuations and improving the operating efficiency of the power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present invention;

[0021] Figure 2 It is a schematic diagram of the side structure of an embodiment of the present invention;

[0022] Figure 3 This is a structural schematic diagram of a coal-feeding mechanism according to an embodiment of the present invention;

[0023] Figure 4 It is a structural schematic diagram of a conveying mechanism according to an embodiment of the present invention;

[0024] Figure 5 It is a bottom view structural schematic diagram of the mixing mechanism according to an embodiment of the present invention;

[0025] Figure 6 Schematic diagram of the decomposed structure of the mixing mechanism according to an embodiment of the present invention.

[0026] In the figure: 11, first support frame; 12, coal storage bin; 13, opening and closing box; 14, baffle; 15, screw; 16, first motor; 17, controller; 21, second support frame; 22, slide rail; 23, second motor; 24, first synchronous wheel; 25, first synchronous belt; 26, second synchronous wheel; 27, second synchronous belt; 31, support plate; 32, sliding block; 33, fixed block; 34, weight sensor; 35, connecting plate; 36, cylinder; 37, mixing bin; 38, third motor; 39, third synchronous wheel; 310, third synchronous belt; 311, fourth synchronous wheel; 312, stirring member. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Example 1

[0031] like Figure 1-Figure 6 As shown,

[0032] An intelligent coal blending device for a coal-fired power plant comprises a coal feeding mechanism, a conveying mechanism and a mixing mechanism. The conveying mechanism is arranged below the coal feeding mechanism, and the mixing mechanism is slidably arranged on the upper surface of the conveying mechanism and can slide along the upper surface of the conveying mechanism.

[0033] The coal feeding mechanism is used to extract coal from the coal storage bin and transport it to the mixing bin for mixing. The coal feeding mechanism includes a coal storage bin, an opening and closing box, a baffle, a screw, a first motor and a controller. The first motor drives the baffle to open and close by controlling the screw to realize quantitative feeding of coal.

[0034] Specifically, the coal adding mechanism includes a plurality of coal storage bins 12, which are fixed to the ground through a first support frame 11. An opening and closing box 13 is fixedly connected to the lower end of the coal storage bin 12, and a baffle 14 is inserted into the interior of the opening and closing box 13. The opening or closing of the opening and closing box 13 is controlled by the movement of the baffle 14.

[0035] In order to control the baffle 14, a first motor 16 is fixed on the first support frame 11, and a screw 15 is fixedly connected to the output shaft of the first motor 16. The screw 15 is connected to the internal thread of the baffle 14, and then the screw 15 can be driven by the first motor 16 to rotate, so that the baffle 14 can move in the opening and closing box 13. A controller 17 is fixedly connected to the surface of the first support frame 11, and the controller 17 is connected to the first motor 16. The controller 17 controls the forward or reverse rotation of the first motor 16 to achieve the extension or withdrawal of the baffle 14 in the opening and closing box 13, thereby completing the opening or closing of the opening and closing box 13.

[0036] When the coal adding mechanism is in operation, the first motor 16 is started through the controller 17, so that the screw 15 drives the baffle 14 to slide in the opening and closing box 13, and the bottom of the coal storage bin 12 is opened, so that the coal in the coal storage bin 12 can enter the mixing mechanism and the mixing mechanism is added with coal.

[0037] The mixing mechanism is used to mix different types of coal to ensure uniform heat release during the combustion process. The mixing mechanism includes a support plate, a sliding block, a weight sensor, a cylinder, a mixing chamber and a stirring element. The weight sensor monitors the weight of the coal in the mixing chamber and feeds the weight information back to the controller, which adjusts the amount of coal added. The stirring element in the mixing chamber mixes different types of coal by slowly rotating to ensure uniform mixing.

[0038] Specifically, the mixing mechanism includes a mixing bin 37, a plurality of stirring members 312 are rotatably connected inside the mixing bin 37, a third motor 38 is fixedly connected to one side of the mixing bin 37, a third synchronous wheel 39 is fixedly connected to one end of the output shaft of the third motor 38, a fourth synchronous wheel 311 is fixed to the rotating shaft of the stirring member 312, a third synchronous belt 310 is overlapped on the surface of the third synchronous wheel 39, and the third synchronous belt 310 is also overlapped on the fourth synchronous wheel 311. The third motor 38 drives the synchronous belt to drive the stirring members 312 inside the mixing bin 37 to stir and mix the coal.

[0039] The bottom of the mixing bin 37 is also provided with a support assembly and a weighing assembly. Specifically, the bottom of the mixing bin 37 is provided with a connecting plate 35 and a supporting plate 31 in sequence. One end of the bottom of the mixing bin 37 is rotatably connected to one end of the connecting plate 35.

[0040] A cylinder 36 is fixed at the bottom of the support plate 31, and a notch is provided at the connecting plate 35. The cylinder 36 passes through the notch and is rotatably connected to the connecting plate 35. The output end of the cylinder 36 is rotatably connected to the mixing bin 37. The mixing bin 37 can be lifted up by the cylinder 36 to discharge the coal in the mixing bin 37. In this embodiment, the connection between the cylinder 36 and the connecting plate 35 has a certain degree of looseness, that is, there is a certain gap at the connection between the top of the cylinder 36 and the bottom of the connecting plate 35. When the cylinder 36 contracts, it does not support the connecting plate, thereby avoiding affecting the weight measurement of the weight sensor 34.

[0041] A weight sensor 34 is fixedly connected to the top of the support plate 31, and a connecting plate 35 is arranged on the top of the weight sensor 34. The weight sensor 34 can obtain the weight change of the material above the support plate 31. The controller 17 is connected to the weight sensor 34 signal. During the process of adding coal into the mixing bin 37, the weight sensor 34 detects the weight of the mixing bin 37. When the weight reaches a predetermined value, a signal is sent to enable the controller 17 to start the first motor 16, so that the screw 15 drives the baffle 14 to close the bottom of the coal storage bin 12. By repeating this operation, multiple types of coal can be added to the mixing bin 37 according to a preset ratio.

[0042] When the mixing bin 37 slides along the conveying mechanism, the third motor 38 slowly drives the third synchronous wheel 39 to rotate, so that the third synchronous belt 310 drives the fourth synchronous wheel 311 to rotate, and the stirring member 312 slowly rotates to mix the various types of coal in the mixing bin 37, so that the heat released when the proportioned coal is burned has a smaller fluctuation range. After the mixing bin 37 moves to the coal unloading position along the conveying mechanism, the cylinder 36 is started to lift one end of the mixing bin 37, and the proportioned and mixed coal is discharged for use in the boiler of the coal-fired power plant. Then the mixing bin 37 is reset along the conveying mechanism, and the proportioning can be performed again.

[0043] The conveying mechanism is used to convey the mixed coal to the boiler or combustion system, and the conveying mechanism includes a slide rail, a sliding block, a fixed block, a second motor, a synchronous wheel and a synchronous belt. The second motor drives the sliding block on the slide rail to move, so that the mixing bin can be accurately charged under the coal charging mechanism of different coal types.

[0044] Specifically, the conveying mechanism includes a slide rail 22, which is fixed to the ground through a second support frame 21. Sliding blocks 32 are fixedly connected to both sides of the bottom of the support plate 31, and the surface of the slide rail 22 is slidably connected to the inside of the sliding block 32. Through the cooperation of the sliding block 32 and the slide rail 22, the sliding cooperation between the mixing bin 37 and the slide rail 22 is realized.

[0045] The second motor 23 is fixedly connected to the surface of the second support frame 21, and one end of the second motor 23 shaft is fixedly connected to the first synchronous wheel 24, and the surface of the first synchronous wheel 24 overlaps the first synchronous belt 25. A plurality of second synchronous wheels 26 are also fixed to the bottom of the second support frame 21, and one end of the first synchronous belt 25 overlaps a second synchronous wheel 26 at the end, and the surface of the second synchronous wheel 26 overlaps the second synchronous belt 27, and the second synchronous belt 27 overlaps other second synchronous wheels 26 to achieve the circulation of the second synchronous belt 27. The bottom of the support plate 31 is fixedly connected to a fixed block 33, and the surface of the second synchronous belt 27 is fixedly connected to the inside of the fixed block 33.

[0046] By starting the second motor 23, the first synchronous wheel 24 drives the first synchronous belt 25 to rotate, and the first synchronous belt 25 drives the second synchronous wheel 26 to rotate, so that the second synchronous belt 27 drives the fixed block 33 to move, and then the support plate 31 drives the sliding block 32 to slide along the slide rail 22. When the mixing bin 37 moves to the bottom of the coal storage bin 12, coal is added to the mixing bin 37.

[0047] The present invention, when used, comprises the following steps:

[0048] During the process of proportioning the coal, the second motor 23 is started, so that the first synchronous wheel 24 drives the first synchronous belt 25 to rotate, and the first synchronous belt 25 drives the second synchronous wheel 26 to rotate, so that the second synchronous belt 27 drives the fixed block 33 to move, and then the support plate 31 drives the sliding block 32 to slide along the slide rail 22;

[0049] When the mixing bin 37 moves to the bottom of the coal storage bin 12, the first motor 16 is started by the controller 17, so that the screw 15 drives the baffle 14 to slide in the opening and closing box 13, and the bottom of the coal storage bin 12 is opened, so that the coal in the coal storage bin 12 can enter the mixing bin 37, and the mixing bin 37 is filled with coal;

[0050] During the coal adding process, the weight sensor 34 detects the weight of the mixing bin 37. When the weight reaches a predetermined value, a signal is sent to enable the controller 17 to start the first motor 16 again, so that the screw 15 drives the baffle 14 to close the bottom of the coal storage bin 12. By repeating this operation, various types of coal can be added to the mixing bin 37 according to a preset ratio.

[0051] When the mixing bin 37 slides along the slide rail 22, the third motor 38 slowly drives the third synchronous wheel 39 to rotate, so that the third synchronous belt 310 drives the fourth synchronous wheel 311 to rotate, and the stirring member 312 slowly rotates to mix the various types of coal in the mixing bin 37, so that when the proportioned coal is burned, the fluctuation range of heat released is smaller;

[0052] After the mixing bin 37 moves along the slide rail 22 to the end of the second support frame 21, the cylinder 36 is started to lift one end of the mixing bin 37, and the proportioned and mixed coal is discharged for use in the boiler of the coal-fired power plant. Then the mixing bin 37 is reset along the slide rail 22, and proportioning can be carried out again.

[0053] The present invention adopts the setting of a mixing mechanism. When the mixing bin passes under each coal adding mechanism, the weight of the coal in the mixing bin is weighed under the action of a weight sensor. According to a preset mixing ratio, when the weight sensor detects that the added weight reaches the standard, the first motor is started to close the coal outlet at the bottom of the coal storage bin, thereby achieving the weighing of the coal during coal mixing. Compared with the conventional method, the mixing ratio is more accurate. In the process of the mixing bin sliding along the slide rail, different coals can be mixed by slowly rotating the stirring element, so that the heat released during combustion is more balanced and more convenient to use.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An intelligent coal blending device for a coal-fired power plant, characterized in that: It includes a coal adding mechanism, a conveying mechanism and a mixing mechanism. The coal adding mechanism is used to extract coal from the coal storage bin and convey it to the mixing bin for proportioning; the conveying mechanism is arranged below the coal adding mechanism, and the mixing mechanism slides along the upper surface of the conveying mechanism; the mixing mechanism is used to mix different types of coal to ensure that the heat of the coal is evenly released during the combustion process.

2. The intelligent coal blending device for a coal-fired power plant according to claim 1, characterized in that: The coal feeding mechanism includes a coal storage bin, an opening and closing box, a baffle, a screw, a first motor and a controller. The first motor controls the baffle through the screw to open and close the opening and closing box, thereby controlling the quantitative feeding of the coal storage bin.

3. The intelligent coal blending device for a coal-fired power plant according to claim 2, characterized in that: The controller is connected to the first motor signal, and controls the sliding of the baffle in the opening and closing box by controlling the forward or reverse rotation of the first motor, thereby realizing the opening or closing of the bottom of the coal storage bin.

4. The intelligent coal blending device for a coal-fired power plant according to claim 2, characterized in that: The mixing mechanism includes a mixing bin, a connecting plate and a supporting plate are provided at the bottom of the mixing bin, the connecting plate is rotatably connected to the mixing bin via a cylinder, a weight sensor is provided between the supporting plate and the connecting plate, the weight sensor is used to monitor the weight of the coal in the mixing bin and feed back the weight information to the controller, and the controller adjusts the amount of coal added according to the weight information; a stirring member is rotatably connected in the mixing bin, and the stirring member mixes different types of coal by slowly rotating to ensure uniform mixing of the coal types.

5. The intelligent coal blending device for a coal-fired power plant according to claim 4, characterized in that: The stirring member is driven by a third motor, and the third motor drives the stirring member to rotate through a third synchronous wheel and a third synchronous belt to evenly mix the coal.

6. The intelligent coal blending device for a coal-fired power plant according to claim 4, characterized in that: The conveying mechanism includes a slide rail and a second motor. A sliding block is fixedly connected to the bottom of the mixing bin. The slide rail and the sliding block cooperate with the second motor to drive the sliding block on the slide rail to move, so that the mixing bin can slide along the slide rail.

7. The intelligent coal blending device for a coal-fired power plant according to claim 6, characterized in that: A fixed block is fixed at the bottom of the support plate, the second motor drives the first synchronous wheel, the second synchronous wheel is driven by the first synchronous belt, and the fixed block is driven to move by the second synchronous belt, and the fixed block drives the support plate to slide along the slide rail.

8. The method for using the intelligent coal blending device of a coal-fired power plant according to claim 6, characterized in that: The steps include: S1, the mixing bin slides along the slide rail. When the mixing bin moves to the bottom of the coal storage bin, the bottom of the coal storage bin is opened through the controller, so that the coal in the coal storage bin can enter the mixing bin and add coal to the mixing bin; S2. During the coal adding process, the weight sensor detects the weight of the mixing bin. When the weight reaches a preset value, a signal is sent and the controller closes the bottom of the coal storage bin. Repeating this operation allows multiple types of coal to be added to the mixing bin according to a preset ratio. S3. When the mixing bin slides along the slide rail, the stirring element is rotated slowly to mix the various types of coal in the mixing bin, so that when the proportioned coal is burned, the fluctuation range of heat released is smaller; S4. When the mixing bin moves along the slide rail to the coal unloading position, the mixing bin discharges the proportioned and mixed coal for use in the boiler of the coal-fired power plant. Then the mixing bin is reset along the slide rail and proportioning can be performed again.

9. The method for using the intelligent coal blending device of a coal-fired power plant according to claim 8, characterized in that: The controller is connected with the weight sensor signal. During the coal proportioning process, the controller automatically adjusts the amount of coal added according to the signal of the weight sensor to make the coal proportioning more accurate.

10. The method for using the intelligent coal blending device of a coal-fired power plant according to claim 8, characterized in that: The conveying mechanism adjusts the load according to the grid demand and accurately controls the position of the mixing bin to add and mix the coal types in a timely manner.

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