A fuel mixing device for power plant boilers

Abstract

This invention relates to the field of power plant boiler fuel processing technology, and particularly to a power plant boiler fuel mixing device, comprising a support frame, a mixing cylinder, a feeding cylinder, a stirring device, a conveying device, and a boiler. This invention solves the following problems existing in the mixing process of coal and biomass: during mixing, biomass fuel tends to sink, and existing technologies cannot scoop up the sunken biomass fuel and mix it thoroughly with the coal, easily affecting the mixing effect. This invention, through a closed system, can extend the stirring time of coal and biomass fuel, thereby achieving thorough mixing of coal and biomass fuel, and can also lift up the deposited coal and biomass fuel, preventing the deposition phenomenon from affecting the mixing uniformity and subsequent combustion effect. Furthermore, by crushing the coal into blocks of a specified size, this invention allows for easier and more uniform mixing with biomass fuel, and more complete combustion.

Description

Technical Field

[0001] This invention relates to the field of power plant boiler fuel treatment technology, and in particular to a power plant boiler fuel mixing device. Background Technology

[0002] In existing power plant boiler operations, uneven fuel mixing leads to low combustion efficiency, incomplete fuel combustion, and increased pollutant emissions. Therefore, developing a device that can effectively mix different fuels is of great significance for improving combustion efficiency and reducing environmental pollution. During the fuel mixing process, by mixing coal with biomass (such as agricultural waste such as wood chips, straw, and rice husks), carbon dioxide emissions can be reduced. At the same time, utilizing waste biomass resources not only reduces power generation costs but also improves the sustainability of energy use.

[0003] In the prior art, those skilled in the art have also made a lot of optimizations to the mixing of fuels. In order to make a more accurate comparison, Chinese Patent No. CN106247373A discloses a coal and biomass fuel mixing and conveying device, including a coal conveying line, a biomass auxiliary fuel conveying line, and a mixing belt; the coal conveying line specifically includes a coal line weighing device, a unloading device, a coal conveying belt, a crusher, and a horizontal belt.

[0004] In the above-mentioned prior art, when coal and biomass are mixed, the weight is measured by a belt scale to adjust the supply of coal and biomass fuel, and finally determine the amount of fuel entering the boiler. Then, a belt conveyor is used to transport the coal, which is crushed into fine particles and mixed with wood chips.

[0005] However, the aforementioned existing technologies still have some shortcomings in the process of mixing coal and biomass:

[0006] 1. Since biomass is generally agricultural waste such as wood chips, straw, and rice husks, it is small in volume. Therefore, when coal and biomass are mixed, the biomass fuel tends to sink. The existing technology mentioned above cannot scoop up the sinking biomass fuel and mix it fully with the coal when mixing coal and biomass fuel, which can affect the mixing effect and result in incomplete combustion of the mixed fuel.

[0007] 2. Furthermore, since biomass fuel is relatively light, it is impossible to accurately control its supply by weighing. This can easily lead to biomass fuel not being mixed with coal according to the specified supply amount. As a result, the mixture of coal and biomass fuel with different supply amounts cannot burn completely, and the flue gas produced after combustion can easily pollute the environment.

[0008] Therefore, based on the above-stated viewpoints, there is still room for improvement in existing fuel mixing methods. Summary of the Invention

[0009] To address the aforementioned problems, this invention provides a fuel mixing device for a power plant boiler, comprising two parallel supports. A mixing cylinder is mounted on the upper end of the two supports via positioning rods. Two through holes are opened at the upper end of the mixing cylinder. Two feed cylinders connected to the through holes are installed at the top of the mixing cylinder. A stirring device for mixing coal and biomass fuel is installed inside the mixing cylinder. A conveying device is provided below the stirring device. A boiler is installed on the side of the conveying device away from the mixing cylinder.

[0010] A controller is installed on any one of the positioning rods. The controller is electrically connected to the stirring device and the conveying device. A monitor for real-time monitoring of combustion efficiency is installed on the boiler. The monitor is electrically connected to the controller.

[0011] As a preferred embodiment of the present invention, one end of the support is located at the bottom of the mixing drum, and the other end gradually tilts upward and is located above the boiler. The conveying device includes multiple transmission shafts rotatably arranged on opposite sides of the two supports. The outer walls of the multiple transmission shafts are jointly fitted with a conveyor belt. A control motor connected to any one of the transmission shafts is installed on the outer wall of any support through a motor cover. The control motor and the controller are electrically connected. In addition, multiple positioning shafts for limiting the bending points of the transmission belt are rotatably arranged on opposite sides of the two supports.

[0012] The outer wall of the conveyor belt is symmetrically fitted with two baffles of the same outline along the width direction, and multiple equidistant clamping strips are evenly distributed on the outer wall of the conveyor belt, with the clamping strips inclined towards the side closer to the direction of conveyor belt operation.

[0013] As a preferred embodiment of the present invention, it further includes a feeding device for adjusting the fuel input amount. The feeding device includes a circular turntable. The circular turntable is rotatably arranged inside the top wall of the mixing cylinder. Two feeding groups are symmetrically opened on the circular turntable. Each feeding group includes multiple discharge holes evenly distributed along the circumference of the circular turntable. The discharge holes have the same diameter as the through holes. A drive unit for controlling the rotation of the circular turntable is installed at the upper end of the mixing cylinder.

[0014] As a preferred embodiment of the present invention, multiple blocking strips are uniformly installed on the inner wall of multiple discharge holes in any one of the feeding groups, and a through hole for passing biomass fuel is formed between two adjacent blocking strips. The width of the through hole on the inner wall of multiple discharge holes in the same feeding group decreases sequentially, and the diameter of multiple discharge holes in another feeding group decreases sequentially. The decreasing order of the through hole width is centrally symmetrical with the decreasing order of the discharge hole diameter.

[0015] As a preferred embodiment of the present invention, the driving unit includes an arc-shaped hole opened at the upper end of the mixing cylinder, the mixing cylinder is located between two through holes, a support column that slides through the arc-shaped hole is installed at the upper end of the circular turntable, and a positioning sleeve is provided at the upper end of the support column;

[0016] A positioning guide rail is installed at the upper end of the mixing drum. A sliding plate is slidably connected to the upper end of the positioning guide rail. A control rod that slides through the positioning sleeve is provided on the side wall of the sliding plate. A positioning cylinder is installed between the side wall of the sliding plate near the positioning guide rail along its length and the top of the mixing drum. The positioning cylinder and the controller are electrically connected.

[0017] As a preferred embodiment of the present invention, the stirring device includes a drive motor mounted on the upper middle part of the mixing cylinder via a motor mount. The drive motor is electrically connected to a controller. The output shaft at the bottom of the drive motor passes through the mixing cylinder and is connected to a rotating shaft. A cross is installed on the inner wall of the mixing cylinder. The bottom of the rotating shaft is rotatably connected to the cross. A crushing unit and an execution unit are installed sequentially from top to bottom between the rotating shaft and the inner wall of the mixing cylinder.

[0018] As a preferred technical solution of the present invention, the crushing unit includes two rotating crushing discs that are sequentially sleeved on the outer wall of the rotating shaft from top to bottom. Two positioning crushing rings corresponding to the positions of the rotating crushing discs are installed on the inner wall of the mixing cylinder. There is an annular material discharge groove between the rotating crushing discs and the positioning crushing rings for crushing coal. The diameter of the upper annular material discharge groove is smaller than the diameter of the lower annular material discharge groove.

[0019] The upper rotating crushing disc and the upper positioning crushing ring are both equipped with guide rings, and the lower ends of the guide rings are inclined towards the side close to the annular material discharge trough.

[0020] As a preferred technical solution of the present invention, the execution unit includes a sleeve sleeved on the lower side of the outer wall of the rotating shaft, a plurality of annularly distributed linkage shafts are uniformly rotatably installed on the outer wall of the sleeve, an annular groove is opened on the inner wall of the mixing cylinder, a gear ring that meshes with a plurality of gears is installed on the top wall of the annular groove, an annular baffle is rotatably installed on the inner wall of the annular groove, and a gear that meshes with the gear ring is fixedly sleeved after the linkage shaft rotates through the annular baffle.

[0021] Multiple material feeding groups for mixing coal and biomass fuel are evenly installed on the outer wall of the linkage shaft. Each material feeding group includes a support rod installed on the outer wall of the linkage shaft. Multiple feeding rods are equidistantly arranged along the length direction on the side of the support rod away from the axis of the linkage shaft. The ends of multiple feeding rods on the same support rod are jointly equipped with scraper plates.

[0022] As a preferred embodiment of the present invention, the side of the scraper away from the lever is an arc-shaped structure, and the direction of rotation of the scraper toward the linkage shaft is an arc-shaped concave surface that facilitates the retrieval of coal blocks and biomass fuel at the bottom of the mixing drum.

[0023] As a preferred embodiment of the present invention, the inner wall of the mixing cylinder is hinged with a plurality of sealing plates arranged alternately with the cross extensions. The sealing plates are movably abutted between two adjacent extensions of the cross, and a control cylinder is hinged between the bottom of the sealing plates and the inner wall of the mixing cylinder.

[0024] In summary, this application includes the following beneficial technical effects:

[0025] I. This invention controls the rotation of a circular turntable to connect discharge holes with through holes of different widths, and the circular turntable also connects discharge holes of different diameters of another feeding group to through holes, thereby adjusting the discharge volume of coal and biomass fuel. Furthermore, the input volume of coal and biomass fuel can be precisely adjusted based on the feedback from the monitor.

[0026] Second, this invention can pulverize coal into blocks of a specified size by performing secondary pulverization, thereby making it easier to mix the pulverized coal blocks with biomass fuel evenly, and making the mixture easier to burn and burn more completely. This prevents larger coal blocks from failing to burn quickly and completely, thus producing toxic carbon monoxide and polluting the environment.

[0027] Third, this invention controls the linkage shaft to rotate on its own axis while revolving around the central axis, so that it drives the lever to stir and mix the coal blocks and biomass fuel inside the mixing drum. At this time, the mixing area in the middle of the mixing drum is sealed by the sealing plate, which can prolong the stirring time of the coal and biomass fuel, thereby achieving full mixing of the coal and biomass fuel.

[0028] Fourth, this invention uses a linkage shaft to control a lever that drives a scraper to lift the coal and biomass fuel piled on the sealing plate upwards, thereby preventing smaller coal lumps or biomass fuel from sinking downwards and affecting the uniformity of mixing and subsequent combustion effect, thus ensuring that the mixed fuel can burn completely. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] Figure 1 This is a schematic diagram of the structure of the present invention.

[0031] Figure 2 This is a schematic diagram of the conveying device of the present invention.

[0032] Figure 3 This is a schematic diagram of the structure between the stirring device and the feeding device of the present invention.

[0033] Figure 4 This is the present invention. Figure 3 A magnified view of part A.

[0034] Figure 5This is a schematic diagram of the structure between the mixing cylinder, the circular turntable, and the blocking strip of the present invention.

[0035] Figure 6 This is a schematic diagram of the structure between the crushing unit and the execution unit of the present invention.

[0036] Figure 7 This is the present invention. Figure 6 A magnified view of section B.

[0037] Figure 8 This is a schematic diagram of the structure between the cross, the sealing plate, and the control cylinder of the present invention.

[0038] In the diagram: 1. Support; 2. Positioning rod; 3. Mixing cylinder; 4. Feeding cylinder; 5. Stirring device; 51. Drive motor; 52. Rotating shaft; 53. Cross; 531. Sealing plate; 532. Control cylinder; 54. Crushing unit; 541. Rotary crushing disc; 542. Positioning crushing ring; 543. Annular discharge chute; 544. Guide ring; 55. Actuating unit; 551. Sleeve; 552. Linkage shaft; 553. Annular groove; 554. Gear ring; 555. Annular baffle; 556. Gear; 557. Support 558. Lever; 559. Scraper; 6. Conveying device; 61. Drive shaft; 62. Conveyor belt; 63. Control motor; 64. Positioning shaft; 65. Baffle plate; 66. Clamping bar; 7. Boiler; 8. Controller; 9. Monitor; 10. Feeding device; 101. Circular turntable; 102. Discharge hole; 103. Drive unit; 104. Blocking bar; 105. Arc-shaped hole; 106. Positioning sleeve; 107. Positioning guide rail; 108. Sliding plate; 109. Control lever; 110. Positioning cylinder. Detailed Implementation

[0039] The following is in conjunction with the appendix Figures 1-8 The embodiments of the present invention will be described in detail below.

[0040] This application discloses a fuel mixing device for a power plant boiler. It should be noted that this fuel mixing device is mainly used in the mixing of coal and biomass fuel. Technically, it can crush the coal into blocks of a specified size, making it easier to mix the crushed coal blocks with the biomass fuel evenly and achieve complete combustion. The coal blocks and biomass fuel are then mixed in a mixing cylinder 3, and finally, the mixed fuel is transported to the boiler 7 for combustion. During this process, the input amounts of coal and biomass fuel can be adjusted based on the flue gas monitoring results from the monitor 9. Furthermore, this fuel mixing device can also enclose the mixing area in the middle of the mixing cylinder 3, extending the mixing time of the coal and biomass fuel, thereby achieving thorough mixing. During the mixing process, it can lift the downward-depositing coal and biomass fuel upwards, preventing smaller coal blocks or biomass fuel from depositing downwards and affecting the mixing uniformity and subsequent combustion effect.

[0041] Example 1:

[0042] Reference Figure 1 As shown, a power plant boiler fuel mixing device includes two parallel supports 1. A mixing cylinder 3 is mounted on the upper end of the two supports 1 via positioning rods 2. Two through holes are opened at the upper end of the mixing cylinder 3. Two feed cylinders 4 connected to the through holes are installed on the top of the mixing cylinder 3. A stirring device 5 for mixing coal and biomass fuel is installed inside the mixing cylinder 3. A conveying device 6 is arranged below the stirring device 5. A boiler 7 is installed on the side of the conveying device 6 away from the mixing cylinder 3.

[0043] A controller 8 is installed on any one of the positioning rods 2. The controller 8 is electrically connected to the stirring device 5 and the conveying device 6. A monitor 9 for real-time monitoring of combustion efficiency is installed on the boiler 7. The monitor 9 is electrically connected to the controller 8.

[0044] It should be noted that the controller 8 and monitor 9 used in this embodiment are both existing technologies. The controller 8 is mainly used to control the start and stop of the stirring device 5 and the conveying device 6, and to receive feedback signals from the monitor 9. The monitor 9 is mainly used to monitor the flue gas generated during the combustion of mixed fuels in real time. In order to ensure that the coal and biomass fuels are fully combusted, the monitor 9 used in this embodiment is preferably a carbon dioxide analyzer in the prior art, which is used to measure the carbon dioxide concentration in the flue gas and reflect the degree of complete fuel combustion. The working principle of the controller 8 and monitor 9 will not be described in detail here.

[0045] In the specific implementation process, firstly, coal and biomass fuel are discharged into the mixing drum 3 through two feed cylinders 4 respectively. Secondly, the stirring device 5 is started by the controller 8, which stirs and mixes the coal and biomass fuel in the mixing drum 3. Then, the mixed fuel falls down the mixing drum 3 onto the conveying device 6. The conveying device 6 is then started by the controller 8, which transports the mixed fuel to the boiler 7 for combustion. During this period, the flue gas generated during the combustion of the mixed fuel in the boiler 7 is monitored in real time by the monitor 9. The monitor can monitor the carbon dioxide concentration in the flue gas and provide real-time feedback to the controller 8 so that the staff can check and adjust the ratio of coal and biomass fuel.

[0046] Reference Figure 1 and Figure 2 As shown, in order to facilitate the transportation of the mixed fuel to the boiler 7, a corresponding conveying device 6 is provided in this embodiment. Specifically, one end of the support 1 is located at the bottom of the mixing cylinder 3, and the other end gradually tilts upward and is located above the boiler 7. The conveying device 6 includes multiple drive shafts 61 rotatably arranged on opposite sides of the two supports 1. The outer walls of the multiple drive shafts 61 are jointly fitted with a conveyor belt 62. A control motor 63 connected to any one drive shaft 61 is installed on the outer wall of any support 1 through a motor cover. The control motor 63 and the controller 8 are electrically connected. In addition, multiple positioning shafts 64 are rotatably arranged on opposite sides of the two supports 1 for limiting the bending of the conveyor belt.

[0047] Furthermore, in this embodiment, two baffles 65 with the same outline are symmetrically fitted on the outer wall of the conveyor belt 62 along the width direction, and a plurality of equidistant clamping strips 66 are uniformly arranged on the outer wall of the conveyor belt 62, with the clamping strips 66 inclined toward the side closer to the running direction of the conveyor belt 62.

[0048] In the specific implementation process, the controller 8 powers on the control motor 63, which drives the conveyor belt 62 through the transmission shaft 61. After the mixing device 5 mixes the coal and biomass fuel evenly, the mixed fuel falls down the mixing drum 3 onto the conveyor belt 62. At this time, the material clamping bar 66 and the baffle plate 65 can limit the mixed fuel and prevent it from spilling. Then, the conveyor belt 62 transports the mixed fuel to the boiler 7 for combustion under the action of the material clamping bar 66.

[0049] Reference Figure 3 , Figure 4 and Figure 5As shown, in order to facilitate the control of fuel input and ensure the stability of the combustion of the mixed fuel in boiler 7, this embodiment also includes a feeding device 10 for adjusting the fuel input. The feeding device 10 includes a circular turntable 101. The circular turntable 101 is rotatably arranged inside the top wall of the mixing cylinder 3. Two feeding groups are symmetrically opened on the circular turntable 101. Each feeding group includes multiple discharge holes 102 evenly distributed around the circumference of the circular turntable 101. The diameter of the discharge holes 102 is equal to that of the through holes. A drive unit 103 for controlling the rotation of the circular turntable 101 is installed at the upper end of the mixing cylinder 3.

[0050] It should be noted that multiple blocking strips 104 are evenly installed on the inner wall of multiple discharge holes 102 in any feeding group. A through hole for biomass fuel is formed between two adjacent blocking strips 104. The width of the through hole on the inner wall of multiple discharge holes 102 in the same feeding group decreases sequentially, and the diameter of multiple discharge holes 102 in another feeding group decreases sequentially. The decreasing order of the through hole width is centrally symmetrical with the decreasing order of the discharge hole diameter.

[0051] Furthermore, in this embodiment, the drive unit 103 includes an arc-shaped hole 105 opened at the upper end of the mixing cylinder 3. The mixing cylinder 3 is located between two through holes. A support column that slides through the arc-shaped hole 105 is installed at the upper end of the circular turntable 101. A positioning sleeve 106 is provided at the upper end of the support column. A positioning guide rail 107 is installed at the upper end of the mixing cylinder 3. A sliding plate 108 is slidably connected to the upper end of the positioning guide rail 107. A control rod 109 that slides through the positioning sleeve 106 is provided on the side wall of the sliding plate 108. A positioning cylinder 110 is installed between any side wall of the sliding plate 108 near the length direction of the positioning guide rail 107 and the top of the mixing cylinder 3. The positioning cylinder 110 is electrically connected to the controller 8.

[0052] In the specific implementation process, the positioning cylinder 110 is started by powering on the controller 8. The positioning cylinder 110 drives the sliding plate 108 to slide along the positioning guide rail 107. The sliding plate 108 drives the positioning sleeve 106 and the support column to slide along the arc hole 105 through the control rod 109. This causes the support column to drive the circular turntable 101 to rotate, so that the circular turntable 101 can drive the discharge holes 102 with different widths of material passage holes to connect with the through holes. The circular turntable 101 also drives the discharge holes 102 with different diameters of another feeding group to connect with the through holes. This allows the discharge volume of coal and biomass fuel to be adjusted, and the input volume of coal and biomass fuel can be adjusted according to the feedback results of the monitor 9.

[0053] Reference Figure 2 and Figure 6As shown, in order to ensure that coal and biomass fuel can be fully combusted, they need to be stirred and mixed. Based on this, a stirring device 5 is provided in this embodiment. Specifically, the stirring device 5 includes a drive motor 51 mounted on the middle of the upper end of the mixing cylinder 3 via a motor mount. The drive motor 51 is electrically connected to the controller 8. The output shaft at the bottom of the drive motor 51 passes through the mixing cylinder 3 and is connected to a rotating shaft 52. A cross 53 is installed on the inner wall of the mixing cylinder 3. The bottom of the rotating shaft 52 is rotatably connected to the cross 53. The cross 53 can support the rotating shaft 52 and prevent the bottom of the rotating shaft 52 from lacking a limit and affecting stability. A crushing unit 54 and an execution unit 55 are installed between the rotating shaft 52 and the inner wall of the mixing cylinder 3 from top to bottom.

[0054] In the specific implementation process, after the coal and biomass fuel enter the mixing drum 3, they first fall into the crushing unit 54. Then, the controller 8 powers on the drive motor 51, which drives the rotating shaft 52 to rotate. The rotating shaft 52, in conjunction with the crushing unit 54, crushes the coal into blocks of a specified size. Subsequently, the crushed coal blocks and biomass fuel fall to the execution unit 55 for stirring and mixing, thereby achieving full mixing of the coal and biomass fuel. The crushed coal blocks are also easier to burn, so that the mixed fuel can burn completely.

[0055] Continue to refer to Figure 6 As shown, in order to ensure that the coal can be fully burned, it can be crushed in this embodiment. Based on this, a crushing unit 54 is also provided in this embodiment. Specifically, the crushing unit 54 includes two rotating crushing discs 541 that are sequentially sleeved on the outer wall of the rotating shaft 52 from top to bottom. Two positioning crushing rings 542 are installed on the inner wall of the mixing cylinder 3, which are respectively corresponding to the positions of the rotating crushing discs 541. There is an annular discharge groove 543 between the rotating crushing discs 541 and the positioning crushing rings 542 for crushing the coal. The diameter of the upper annular discharge groove 543 is smaller than the diameter of the lower annular discharge groove 543.

[0056] Furthermore, in this embodiment, guide rings 544 are installed on the upper ends of the upper rotating crushing disc 541 and the upper positioning crushing ring 542, and the lower ends of the guide rings 544 are inclined toward the side close to the annular discharge trough 543.

[0057] In the specific implementation process, while the drive motor 51 drives the rotating shaft 52 to rotate, the rotating shaft 52 drives the rotating crushing discs 541 on the upper and lower sides to rotate synchronously. Since the positioning crushing ring 542 is in a fixed state, the rotating crushing disc 541 and the positioning crushing ring 542 rotate relative to each other. When the coal enters the mixing drum 3, it falls downwards. Under the action of the two guide rings 544, the coal falls into the upper annular feed trough 543 to receive crushing. Then, the coal falls downwards into the lower annular feed trough 543 to receive secondary crushing. This ensures that the coal is crushed into blocks of a specified size, making it easier to mix the crushed coal blocks with biomass fuel evenly. The mixed coal is easier to burn and burns more completely, preventing larger coal blocks from failing to burn quickly and completely and producing toxic carbon monoxide that pollutes the environment.

[0058] Reference Figure 6 , Figure 7 and Figure 8 As shown, in order to uniformly mix the crushed coal lumps and biomass fuel, in this embodiment, the execution unit 55 includes a sleeve 551 sleeved on the lower side of the outer wall of the rotating shaft 52. Multiple annularly distributed linkage shafts 552 are uniformly rotatably installed on the outer wall of the sleeve 551. An annular groove 553 is opened on the inner wall of the mixing cylinder 3. A gear ring 554 that meshes with multiple gears 556 is installed on the top wall of the annular groove 553. An annular baffle 555 is rotatably installed on the inner wall of the annular groove 553. After the linkage shaft 552 rotates through the annular baffle 555, the gear 556 that meshes with the gear ring 554 is fixedly sleeved on it.

[0059] Furthermore, in this embodiment, multiple material feeding groups for stirring and mixing coal and biomass fuel are uniformly installed on the outer wall of the linkage shaft 552. Each material feeding group includes a support rod 557 installed on the outer wall of the linkage shaft 552. Multiple levers 558 are equidistantly arranged along the length direction on the side of the support rod 557 away from the axis of the linkage shaft 552. The ends of the multiple levers 558 on the same support rod 557 are jointly equipped with scraper plates 559.

[0060] It should be noted that the feeding groups on two adjacent linkage shafts 552 are arranged in an alternating manner to avoid interference between the scraper plates 559 on two adjacent linkage shafts 552.

[0061] Furthermore, in this embodiment, the side of the scraper 559 away from the lever 558 is an arc-shaped structure, and the direction of rotation of the scraper 559 toward the linkage shaft 552 is an arc-shaped concave surface that facilitates the retrieval of coal blocks and biomass fuel at the bottom of the mixing drum 3.

[0062] Furthermore, in order to extend the mixing time of coal and biomass fuel to enhance the mixing intensity and uniformity, in this embodiment, the inner wall of the mixing cylinder 3 is hinged with a plurality of sealing plates 531 arranged alternately with the extensions of the cross 53. The sealing plates 531 are movably abutted between two adjacent extensions of the cross 53. A control cylinder 532 is hinged between the bottom of the sealing plate 531 and the inner wall of the mixing cylinder 3. In the initial state, the extension end of the control cylinder 532 is in the extended state, thereby controlling the cylinder 532 to lift the sealing plate 531 upward and close the space between two adjacent extensions of the cross 53, thereby closing the mixing area in the middle of the mixing cylinder 3, and thus achieving full mixing of coal and biomass fuel.

[0063] In the specific implementation process, while the rotating shaft 52 rotates, it drives multiple linkage shafts 552 to revolve through the sleeve 551. While the linkage shafts 552 revolve, they also rotate on their own axis under the action of the gear 556 and the gear ring 554, and the direction of rotation of the linkage shafts 552 is opposite to their direction of revolution. During this period, the linkage shafts 552 drive the lever 558 through the support rod 557 to stir and mix the coal blocks and biomass fuel inside the mixing drum 3. At this time, the sealing plate 531 can extend the stirring time of the coal and biomass fuel by sealing the mixing area in the middle of the mixing drum 3, thereby achieving full mixing of the coal and biomass fuel. During this process, the linkage shafts 552 drive the scraper 559 through the lever 558 to lift the coal and biomass fuel accumulated on the sealing plate 531 upward, thereby preventing small coal blocks or biomass fuel from sinking downward and affecting the uniformity of mixing and subsequent combustion effect, thus ensuring that the mixed fuel can burn fully.

[0064] During operation: Step 1: First, coal and biomass fuel are discharged into the mixing drum 3 through two feed cylinders 4 respectively.

[0065] Step 2: After the coal enters the mixing drum 3, it falls downwards. Under the action of the two guide rings 544, the coal falls into the upper annular chute 543 to be crushed. Then, the coal falls downwards into the lower annular chute 543 to be crushed a second time. This ensures that the coal is crushed into blocks of a specified size, making it easier to mix the crushed coal blocks with the biomass fuel evenly. The mixture is also easier to burn and burns more completely, preventing larger coal blocks from failing to burn quickly and completely and producing toxic carbon monoxide that pollutes the environment.

[0066] Step 3: While rotating shaft 52 rotates, it drives multiple linkage shafts 552 to revolve through sleeve 551. While revolving, the linkage shafts 552 rotate on their own axis under the action of gear 556 and gear ring 554, and the direction of rotation of the linkage shafts 552 is opposite to the direction of their revolution. During this period, the linkage shafts 552 drive the lever 558 through support rod 557 to stir and mix the coal blocks and biomass fuel inside the mixing drum 3. At this time, sealing the mixing area in the middle of the mixing drum 3 by sealing plate 531 can prolong the stirring time of coal and biomass fuel, thereby achieving full mixing of coal and biomass fuel.

[0067] During this process, the linkage shaft 552 drives the scraper 559 via the lever 558 to lift the coal and biomass fuel piled on the sealing plate 531 upwards, thereby preventing smaller coal lumps or biomass fuel from sinking downwards and affecting the mixing uniformity and subsequent combustion effect, thus ensuring that the mixed fuel can burn completely.

[0068] Step 4: The controller 8 powers on the control motor 63, which drives the conveyor belt 62 via the transmission shaft 61. After the coal and biomass fuel are mixed evenly, they fall down the mixing drum 3 onto the conveyor belt 62. The material clamping bar 66 and the baffle plate 65 limit the mixed fuel and prevent it from spilling. Then, the conveyor belt 62 transports the mixed fuel to the boiler 7 for combustion under the action of the material clamping bar 66.

[0069] Step 5: Monitor the flue gas generated during the combustion of mixed fuels in boiler 7 in real time through monitor 9. The monitor can monitor the carbon dioxide concentration in the flue gas and provide real-time feedback to controller 8 so that staff can view and adjust the ratio of coal and biomass fuel.

[0070] Step 6: When the monitor 9 feeds back the carbon dioxide concentration in the flue gas to the controller 8, the controller 8 powers on the positioning cylinder 110. The positioning cylinder 110 drives the sliding plate 108 to slide along the positioning guide rail 107. The sliding plate 108 drives the positioning sleeve 106 and the support column to slide along the arc hole 105 through the control rod 109. This causes the support column to drive the circular turntable 101 to rotate, so that the circular turntable 101 can drive the discharge holes 102 with different widths of material through holes to connect with the through holes. The circular turntable 101 also drives the discharge holes 102 with different diameters of another feeding group to connect with the through holes. This allows the discharge volume of coal and biomass fuel to be adjusted, and the input volume of coal and biomass fuel can be adjusted according to the feedback results of the monitor 9.

[0071] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0072] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A power plant boiler fuel mixing device, comprising two mutually parallel supports (1), the upper ends of the two supports (1) are commonly provided with a mixing cylinder (3) through positioning rods (2), the upper end of the mixing cylinder (3) is provided with two through holes, the top of the mixing cylinder (3) is provided with two feeding cylinders (4) connected with the through holes, the inside of the mixing cylinder (3) is provided with a stirring device (5) for mixing coal and biomass fuel, the lower side of the stirring device (5) is provided with a conveying device (6), the side away from the mixing cylinder (3) of the conveying device (6) is provided with a boiler (7), characterized in that: any one of the positioning rods (2) is provided with a controller (8), the controller (8) is electrically connected with the stirring device (5) and the conveying device (6), the boiler (7) is provided with a monitor (9) for monitoring the combustion efficiency in real time, the monitor (9) is electrically connected with the controller (8); further comprising a feeding device (10) for adjusting the input amount of fuel, the feeding device (10) comprises a circular turntable (101), the inside of the top wall of the mixing cylinder (3) is rotatably provided with the circular turntable (101), the circular turntable (101) is symmetrically provided with two discharging groups, each discharging group comprises a plurality of discharge holes (102) uniformly distributed along the circumference of the circular turntable (101), the diameter of the discharge hole (102) is equal to that of the through hole, the upper end of the mixing cylinder (3) is provided with a driving unit (103) for controlling the rotation of the circular turntable (101); the inner walls of the plurality of discharge holes (102) of any one discharging group are uniformly provided with a plurality of blocking strips (104), the blocking strips (104) are formed with a plurality of passing holes for passing biomass fuel.

2. A power plant boiler fuel mixing apparatus according to claim 1, characterized in that: one end of the support (1) is located at the bottom of the mixing cylinder (3), the other end is gradually inclined upward and located above the boiler (7), the conveying device (6) comprises a plurality of transmission shafts (61) rotatably arranged on the opposite sides of the two supports (1), the outer wall of the plurality of transmission shafts (61) is commonly provided with a conveying belt (62), the outer wall of any one support (1) is provided with a control motor (63) connected with any one transmission shaft (61) through a motor cover, the control motor (63) and the controller (8) are electrically connected, and the opposite sides of the two supports (1) are further rotatably provided with a plurality of positioning shafts (64) for limiting the bending part of the transmission belt; the outer wall of the conveying belt (62) is symmetrically provided with two material blocking plates (65) with the same outline as the conveying belt (62) along the width direction, the outer wall of the conveying belt (62) is uniformly provided with a plurality of clamping strips (66) distributed at equal intervals, and the clamping strips (66) are inclined to the side close to the running direction of the conveying belt (62).

3. A power plant boiler fuel mixing apparatus according to claim 1, characterized in that: the widths of the passing holes in the inner walls of the plurality of discharge holes (102) of the same discharging group gradually decrease, the diameters of the plurality of discharge holes (102) of the other discharging group gradually decrease, and the decreasing order of the widths of the passing holes is centrally symmetrically distributed with the decreasing order of the diameters of the discharge holes (102).

4. A power plant boiler fuel mixing apparatus according to claim 1, characterized in that: The driving unit (103) comprises an arc-shaped hole (105) formed on the upper end of the mixing cylinder (3), the mixing cylinder (3) is located between two through holes, the upper end of the circular rotating disc (101) is provided with a support which slides through the arc-shaped hole (105), and the upper end of the support is provided with a positioning sleeve (106); The upper end of the mixing cylinder (3) is provided with a positioning guide rail (107), the upper end of the positioning guide rail (107) is slidably connected with a sliding plate (108), the side wall of the sliding plate (108) is provided with a control rod (109) which slides through the positioning sleeve (106), and the sliding plate (108) is provided with a positioning air cylinder (110) between any side wall close to the length direction of the positioning guide rail (107) and the top of the mixing cylinder (3), and the positioning air cylinder (110) is electrically connected with the controller (8).

5. A power plant boiler fuel mixing apparatus according to claim 1, characterized in that: The stirring device (5) comprises a driving motor (51) which is installed on the upper end of the mixing cylinder (3) through a motor base, the driving motor (51) is electrically connected with the controller (8), and the output shaft at the bottom of the driving motor (51) is connected with a rotating shaft (52) through the mixing cylinder (3), the inner wall of the mixing cylinder (3) is provided with a cross (53), the rotating shaft (52) is rotatably connected with the cross (53) at the bottom, and the powder crushing unit (54) and the execution unit (55) are sequentially installed from top to bottom between the rotating shaft (52) and the inner wall of the mixing cylinder (3).

6. A power plant boiler fuel mixing apparatus according to claim 5, characterised in that: The powder crushing unit (54) comprises two rotating crushing discs (541) which are sequentially sleeved on the outer wall of the rotating shaft (52) from top to bottom, the inner wall of the mixing cylinder (3) is provided with two positioning crushing rings (542) which correspond to the positions of the rotating crushing discs (541) respectively, the rotating crushing disc (541) and the positioning crushing ring (542) at the corresponding position have an annular material falling groove (543) for crushing the coal, and the diameter of the annular material falling groove (543) above is smaller than that of the annular material falling groove (543) below; The upper rotating crushing disc (541) and the upper positioning crushing ring (542) are both provided with a guide ring (544) at the upper end, and the lower end of the guide ring (544) is inclined to the side close to the annular material falling groove (543).

7. A power plant boiler fuel mixing apparatus according to claim 5, characterized in that: The execution unit (55) comprises a sleeve (551) which is sleeved on the lower side of the outer wall of the rotating shaft (52), a plurality of annularly distributed linkage shafts (552) are uniformly rotatably installed on the outer wall of the sleeve (551), the inner wall of the mixing cylinder (3) is provided with an annular groove (553), the inner top wall of the annular groove (553) is provided with a gear ring (554) which is engaged with a plurality of gears (556), the inner wall of the annular groove (553) is rotatably provided with an annular baffle (555), and the linkage shaft (552) is fixedly sleeved with a gear (556) which is engaged with the gear ring (554) after rotating through the annular baffle (555). The outer wall of the linkage shaft (552) is uniformly provided with a plurality of stirring groups for stirring and mixing the coal and biomass fuel, each of the stirring groups comprises a supporting rod (557) installed on the outer wall of the linkage shaft (552), and a plurality of stirring rods (558) are equidistantly arranged along the length direction on the side of the supporting rod (557) away from the axis of the linkage shaft (552), and the end portions of the plurality of stirring rods (558) on the same supporting rod (557) are jointly provided with a scraping plate (559).

8. A power plant boiler fuel mixing apparatus according to claim 7, characterised in that: The side of the scraping plate (559) away from the stirring rod (558) is in an arc structure, and the scraping plate (559) is directed to the running direction of the linkage shaft (552) to facilitate the arc concave surface to pick up the coal blocks and biomass fuel at the bottom of the mixing cylinder (3).

9. A power plant boiler fuel mixing apparatus according to claim 5, characterized in that: A plurality of sealing plates (531) are hingedly arranged on the inner wall of the mixing cylinder (3) and staggered with the extension sections of the cross (53), the sealing plates (531) are movably abutted between two adjacent extension sections of the cross (53), and control cylinders (532) are hingedly arranged between the bottom of the sealing plate (531) and the inner wall of the mixing cylinder (3).

Images