Fuel mixing equipment for boiler of power plant

Abstract

The invention relates to the technical field of power plant boiler fuel treatment, in particular to power plant boiler fuel mixing equipment which comprises a support, a mixing barrel, a feeding barrel, a stirring device, a conveying device and a boiler. According to the invention, the following problems in the mixing process of fire coal and biomass in the prior art can be solved: when the fire coal and the biomass are mixed, the biomass fuel is easy to sink, and the sinking biomass fuel cannot be fished up and fully mixed with the fire coal in the prior art, so that the mixing effect is easy to influence; the stirring time of fire coal and biomass fuel can be prolonged in a closed mode, so that sufficient mixing of the fire coal and the biomass fuel is achieved, the deposited fire coal and the deposited biomass fuel can be pulled up, and the situation that the mixing uniformity and the subsequent combustion effect are affected by the deposition phenomenon is prevented; according to the invention, fire coal is crushed into blocks with specified sizes, so that the fire coal can be more easily and uniformly mixed with biomass fuel, and combustion is more sufficient.

Description

Technical Field

[0001] The invention relates to the technical field of power plant boiler fuel processing, and in particular to a power plant boiler fuel mixing device. Background Art

[0002] In the operation of existing power plant boilers, uneven fuel mixing will lead 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 to improving combustion efficiency and reducing environmental pollution. During the fuel mixing process, by mixing coal with biomass (such as wood chips, straw, rice husks and other agricultural waste), carbon dioxide emissions can be reduced. At the same time, the use of waste biomass resources can not only reduce the cost of power generation, but also improve the sustainability of energy utilization.

[0003] In the prior art, technicians in related fields have also made a lot of optimizations on the mixing of fuels. In order to make a more accurate comparison, for example, a Chinese patent with publication number CN106247373A discloses a coal and biomass fuel mixed 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] When the above-mentioned prior art is used, the weight of the coal and biomass mixture is weighed by a belt scale, the supply of coal and biomass fuel is adjusted, and the amount of fuel entering the boiler is finally determined, and then a belt conveyor is used for transportation. The coal is crushed into fine particles and mixed with wood chips.

[0005] However, the above-mentioned prior art still has 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, which are small in size, when coal and biomass are mixed, the biomass fuel is likely to sink. However, when the above-mentioned prior art mixes coal and biomass fuel, it is impossible to pick up the sunken biomass fuel and fully mix it with coal, which easily affects the mixing effect, and the mixed fuel still has the phenomenon of incomplete combustion.

[0007] 2. Since biomass fuel is light in weight, its supply cannot be accurately controlled by weighing, which may cause the biomass fuel to be unable to be mixed with coal according to the specified supply amount, resulting in that coal and biomass fuel with different supply amounts cannot be fully burned after mixing, and the smoke generated after combustion is likely to pollute the environment.

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

[0009] In order to solve the above problems, the present invention provides a fuel mixing device for a boiler in a power plant, comprising two brackets parallel to each other, a mixing cylinder being commonly installed on the upper ends of the two brackets through a positioning rod, two through holes being provided on the upper end of the mixing cylinder, two feeding cylinders connected to the through holes being installed on the top of the mixing cylinder, a stirring device for mixing coal and biomass fuel being installed inside the mixing cylinder, a conveying device being arranged below the stirring device, and a boiler being installed on a side of the conveying device away from the mixing cylinder.

[0010] A controller is installed on any one of the positioning rods, and 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, and the monitor is electrically connected to the controller.

[0011] As a preferred technical solution of the present invention, one end of the bracket is located at the bottom of the mixing drum, and the other end is gradually tilted upward and located above the boiler. The conveying device includes a plurality of transmission shafts rotatably arranged on opposite sides of the two brackets, and the outer walls of the plurality of transmission shafts are jointly sleeved with a conveyor belt. A control motor connected to any transmission shaft is installed on the outer wall of any bracket through a motor cover, and the control motor and the controller are electrically connected. In addition, a plurality of positioning shafts for limiting the bending position of the transmission belt are rotatably arranged on the opposite sides of the two brackets.

[0012] The outer wall of the conveyor belt is symmetrically provided with two material blocking plates with the same profile along the width direction, and the outer wall of the conveyor belt is evenly provided with a plurality of equidistantly distributed material blocking strips, which are inclined toward the side close to the running direction of the conveyor belt.

[0013] As a preferred technical solution of the present invention, it also includes a feeding device for adjusting the fuel input amount, the feeding device includes a circular turntable, a circular turntable is rotatably arranged inside the top wall of the mixing barrel, two discharge groups are symmetrically arranged on the circular turntable, each discharge group includes a plurality of discharge holes evenly distributed along the circumference of the circular turntable, the discharge holes are equal to the through hole in diameter, and a driving unit for controlling the rotation of the circular turntable is installed at the upper end of the mixing barrel.

[0014] As a preferred technical solution of the present invention, a plurality of blocking bars are evenly installed on the inner walls of the multiple discharge holes of any one of the feeding groups, and a penetration hole for passing the biomass fuel is formed between two adjacent blocking bars. The widths of the penetration holes on the inner walls of the multiple discharge holes of the same feeding group decrease successively, and the diameters of the multiple discharge holes of another feeding group decrease successively, and the order of reduction of the width of the penetration holes is centrally symmetrical to the order of reduction of the diameter of the discharge holes.

[0015] As a preferred technical solution 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 the two through holes, a pillar sliding 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 pillar;

[0016] A positioning guide rail is installed on the upper end of the mixing barrel, and 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 any side wall of the sliding plate close to the length direction of the positioning guide rail and the top of the mixing barrel, and the positioning cylinder and the controller are electrically connected.

[0017] As a preferred technical solution of the present invention, the stirring device includes a driving motor installed in the middle of the upper end of the mixing barrel through a motor seat, the driving motor is electrically connected to the controller, the output shaft at the bottom of the driving motor passes through the mixing barrel and is connected to a rotating shaft, a cross is installed on the inner wall of the mixing barrel, the bottom of the rotating shaft is rotatably connected to the cross, and a crushing unit and an execution unit are installed in sequence from top to bottom between the rotating shaft and the inner wall of the mixing barrel.

[0018] As a preferred technical solution of the present invention, the pulverizing unit comprises two rotating pulverizing discs which are sequentially sleeved on the outer wall of the rotating shaft from top to bottom, and the inner wall of the mixing barrel is provided with two positioning pulverizing rings which respectively correspond to the positions of the rotating pulverizing discs, and an annular material drop groove for pulverizing the fuel coal is provided between the rotating pulverizing discs and the positioning pulverizing rings which correspond to the positions, and the diameter of the upper annular material drop groove is smaller than the diameter of the lower annular material drop groove;

[0019] The upper ends of 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 both inclined toward a side close to the annular material dropping chute.

[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 evenly rotated and installed on the outer wall of the sleeve, an annular groove is opened on the inner wall of the mixing cylinder, a gear ring meshing 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 meshing with the gear ring is fixedly sleeved after the linkage shaft rotates through the annular baffle;

[0021] A plurality of material shifting groups for stirring and mixing coal and biomass fuel are evenly installed on the outer wall of the linkage shaft, and each material shifting group includes a support rod installed on the outer wall of the linkage shaft. A plurality of shifting rods are equidistantly arranged along the length direction on one side of the support rod away from the axis of the linkage shaft, and a scraper plate is commonly installed at the ends of the plurality of shifting rods on the same support rod.

[0022] As a preferred technical solution of the present invention, the side of the scraper plate away from the lever is an arc-shaped structure, and the scraper plate points to the running direction of the linkage shaft to facilitate scooping the arc-shaped concave surface of the coal blocks and biomass fuel at the bottom of the mixing barrel.

[0023] As a preferred technical solution of the present invention, the inner wall of the mixing cylinder is hinged with multiple sealing plates arranged alternately with the cross extension sections, the sealing plates are movably abutted between two adjacent extension sections of the cross, and a control cylinder is hinged between the bottom of the sealing plate and the inner wall of the mixing cylinder.

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

[0025] 1. The present invention controls the rotation of a circular turntable to drive the discharge holes with different widths to be connected with the through holes, and the circular turntable drives the discharge holes with different diameters of another feeding group to be connected with the through holes, so as to adjust the discharge amount of coal and biomass fuel, and then the input amount of coal and biomass fuel can be accurately adjusted according to the feedback results of the monitor.

[0026] 2. The present invention can crush the coal into blocks of a specified size by secondary crushing, so that the crushed coal blocks and biomass fuel can be more evenly mixed, and are easier to burn after mixing, and the combustion is more complete, preventing larger coal from failing to burn quickly and completely to produce toxic carbon monoxide and pollute the environment.

[0027] 3. The present invention controls the linkage shaft to revolve and rotate at the same time, so that it drives the lever to stir and mix the coal blocks and biomass fuel inside the mixing cylinder. At this time, the mixing area in the middle of the mixing cylinder is closed by a sealing plate, which can extend the stirring time of the coal and biomass fuel, thereby achieving sufficient mixing of the coal and biomass fuel.

[0028] Fourth, the present invention controls the lever through a linkage shaft to drive the scraper plate to lift up the coal and biomass fuel accumulated on the sealing plate, thereby preventing smaller coal blocks or biomass fuel from settling downward and affecting the mixing uniformity and subsequent combustion effect, thereby ensuring that the mixed fuel can be fully burned. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0030] Figure 1 It is a structural schematic diagram of the present invention.

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

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

[0033] Figure 4 The present invention Figure 3 A partial enlarged view of point A.

[0034] Figure 5It is a schematic diagram of the structure among the mixing cylinder, the circular rotating disk and the blocking strip of the present invention.

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

[0036] Figure 7 The present invention Figure 6 A partial enlarged view of point B.

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

[0038] In the figure, 1, bracket; 2, positioning rod; 3, mixing barrel; 4, feeding barrel; 5, stirring device; 51, driving motor; 52, rotating shaft; 53, cross; 531, sealing plate; 532, control cylinder; 54, crushing unit; 541, rotating crushing disk; 542, positioning crushing ring; 543, annular drop groove; 544, guide ring; 55, execution unit; 551, sleeve; 552, linkage shaft; 553, annular groove; 554, gear ring; 555, annular baffle; 556, gear; 557, support Rod; 558, lever; 559, scraper plate; 6, conveying device; 61, transmission 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, baffle bar; 105, arc hole; 106, positioning sleeve; 107, positioning guide rail; 108, sliding plate; 109, control rod; 110, positioning cylinder. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-Figure 8 Embodiments of the present invention are described in detail.

[0040] The embodiment of the present application discloses a power plant boiler fuel mixing device. It should be noted that the power plant boiler fuel mixing device of the present application is mainly used in the process of stirring and mixing coal and biomass fuel. In terms of technical effect, the coal can be crushed into blocks of a specified size, so that the crushed coal blocks and biomass fuel are easier to mix evenly and fully burn, and then the coal blocks and biomass fuel are stirred and mixed in a mixing barrel 3, and finally the mixed fuel is transported to the boiler 7 for combustion. During this period, the input amount of coal and biomass fuel can be adjusted according to the monitoring result of the flue gas generated during combustion by the monitor 9; further, the power plant boiler fuel mixing device can also seal the mixing area in the middle of the mixing barrel 3 to extend the stirring time of coal and biomass fuel, so as to achieve full mixing of coal and biomass fuel, and during the mixing process, the coal and biomass fuel deposited downward can be pushed upward, thereby preventing smaller coal blocks or biomass fuel from depositing downward and affecting the mixing uniformity and subsequent combustion effect.

[0041] Embodiment 1:

[0042] Reference Figure 1 As shown, a fuel mixing device for a boiler in a power plant comprises two brackets 1 which are parallel to each other. A mixing cylinder 3 is installed on the upper ends of the two brackets 1 through a positioning rod 2. Two through holes are provided on the upper end of the mixing cylinder 3. Two feeding cylinders 4 which are connected with 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 positioning rod 2, and 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, and the monitor 9 is electrically connected to the controller 8.

[0044] It should be noted that the controller 8 and the monitor 9 used in this embodiment are both existing technologies, wherein 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 the feedback signal of the monitor 9, and the monitor 9 is mainly used to monitor the flue gas generated during the combustion of the mixed fuel in real time. In order to ensure the full combustion of coal and biomass fuel, the monitor 9 used in this embodiment is preferably a carbon dioxide analyzer in the existing technology, which is used to measure the carbon dioxide concentration in the flue gas to reflect the completeness of the fuel combustion. The working principles of the controller 8 and the monitor 9 are not repeated here.

[0045] In the specific implementation process, first, the coal and biomass fuel are discharged into the mixing drum 3 through the two feeding drums 4 respectively, and then the stirring device 5 is powered on and started through the controller 8, so that the stirring device 5 stirs and mixes the coal and biomass fuel in the mixing drum 3, and then the mixed fuel falls downward along the mixing drum 3 to the conveying device 6, and then the conveying device 6 is powered on and started through the controller 8, so that the conveying device 6 conveys 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, and the carbon dioxide concentration in the flue gas can be monitored and fed back to the controller 8 in real time, 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 transportation device 6 is provided in this embodiment. Specifically, one end of the bracket 1 is located at the bottom of the mixing barrel 3, and the other end is gradually tilted upward and located above the boiler 7. The transportation device 6 includes a plurality of transmission shafts 61 rotatably arranged on opposite sides of the two brackets 1, and the outer walls of the plurality of transmission shafts 61 are jointly sleeved with a conveyor belt 62. A control motor 63 connected to any one of the transmission shafts 61 is installed on the outer wall of any one of the brackets 1 through a motor cover, and the control motor 63 is electrically connected to the controller 8, and a plurality of positioning shafts 64 for limiting the bending parts of the transmission belts are also rotatably arranged on the opposite sides of the two brackets 1.

[0047] Furthermore, in this embodiment, two material baffles 65 with the same contour are symmetrically mounted on the outer wall of the conveyor belt 62 along the width direction, and a plurality of equidistantly distributed material retaining strips 66 are evenly arranged on the outer wall of the conveyor belt 62, and the material retaining strips 66 are inclined toward the side close to the running direction of the conveyor belt 62.

[0048] During the specific implementation process, the control motor 63 is powered on and started through the controller 8, and the control motor 63 drives the conveyor belt 62 to operate through the transmission shaft 61. After the stirring device 5 mixes the coal and biomass fuel evenly, the mixed fuel falls downward along the mixing barrel 3 onto the conveyor belt 62. At this time, the mixed fuel can be limited by the clamping strip 66 and the baffle plate 65 to prevent it from spilling; then the conveyor belt 62 transports the mixed fuel to the boiler 7 for combustion under the action of the clamping strip 66.

[0049] Reference Figure 3 , Figure 4 and Figure 5As shown, in order to facilitate the control of the fuel input amount so that the mixed fuel in the boiler 7 has stability during combustion, in this embodiment, a feeding device 10 for adjusting the fuel input amount is also included, and the feeding device 10 includes a circular turntable 101, and a circular turntable 101 is rotatably arranged inside the top wall of the mixing barrel 3, and two feeding groups are symmetrically provided on the circular turntable 101, and each feeding group includes a plurality of discharge holes 102 uniformly distributed along the circumference of the circular turntable 101, and the discharge holes 102 are equal to the diameter of the through hole, and a driving unit 103 for controlling the rotation of the circular turntable 101 is installed on the upper end of the mixing barrel 3.

[0050] It should be noted that a plurality of blocking bars 104 are evenly installed on the inner walls of the multiple discharge holes 102 of any feeding group, and a penetration hole for passing the biomass fuel is formed between two adjacent blocking bars 104, and the penetration hole widths of the multiple discharge holes 102 on the inner walls of the same feeding group decrease successively, and the diameters of the multiple discharge holes 102 of another feeding group decrease successively, and the order of reduction of the penetration hole width is centrally symmetrical to the order of reduction of the diameter of the discharge hole 102.

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

[0052] During the specific implementation process, the positioning cylinder 110 is powered on and started through the controller 8, and 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 pillar to slide along the arc hole 105 through the control rod 109, so that the pillar drives the circular turntable 101 to rotate, so that the circular turntable 101 drives the discharge holes 102 with different widths of the through holes to be connected with the through holes, and the circular turntable 101 drives the discharge holes 102 of different diameters of another feeding group to be connected with the through holes, so that the discharge amount of coal and biomass fuel can be adjusted, and then the input amount 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 the coal and biomass fuel can be fully burned, 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 driving motor 51 installed in the middle of the upper end of the mixing barrel 3 through a motor seat. The driving motor 51 is electrically connected to the controller 8. The output shaft at the bottom of the driving motor 51 passes through the mixing barrel 3 and is connected to a rotating shaft 52. A cross 53 is installed on the inner wall of the mixing barrel 3. The bottom of the rotating shaft 52 is rotatably connected to the cross 53. The rotating shaft 52 can be supported by the cross 53 to prevent the bottom of the rotating shaft 52 from lacking a limit and affecting the stability. A crushing unit 54 and an execution unit 55 are installed in sequence from top to bottom between the rotating shaft 52 and the inner wall of the mixing barrel 3.

[0054] In the specific implementation process, after the coal and biomass fuel enter the mixing barrel 3, they first fall on the crushing unit 54, and then the controller 8 enables the drive motor 51 to be powered on and started, and the drive motor 51 drives the rotating shaft 52 to rotate, and the rotating shaft 52 cooperates with the crushing unit 54 to crush the coal into blocks of a specified size; then the crushed coal blocks and biomass fuel fall to the execution unit 55 to receive stirring and mixing, so as to achieve sufficient stirring of the coal and biomass fuel, and the crushed coal blocks are easier to burn, so that the mixed fuel can be fully burned.

[0055] Continue to refer to Figure 6 As shown, in order to ensure that the coal can be fully burned, it can be crushed accordingly 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 disks 541 which are sequentially sleeved on the outer wall of the rotating shaft 52 from top to bottom. Two positioning crushing rings 542 corresponding to the positions of the rotating crushing disks 541 are installed on the inner wall of the mixing barrel 3. An annular feeding trough 543 for crushing the coal is provided between the rotating crushing disks 541 and the positioning crushing rings 542 which correspond to the positions. The diameter of the upper annular feeding trough 543 is smaller than that of the lower annular feeding trough 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 a side close to the annular drop chute 543 .

[0057] During the specific implementation process, while the driving motor 51 drives the rotating shaft 52 to rotate, the rotating shaft 52 drives the rotating crushing disks 541 on the upper and lower sides to rotate synchronously. Since the positioning crushing ring 542 is in a fixed state, the rotating crushing disk 541 and the positioning crushing ring 542 rotate relative to each other; when the coal enters the mixing barrel 3 and falls downward, under the action of the two guide rings 544, the coal falls into the upper annular chute 543 to be crushed, and then the coal falls downward into the lower annular chute 543 to be crushed for the second time, thereby ensuring that the coal is crushed into blocks of a specified size, and then the crushed coal blocks and biomass fuel are easier to mix evenly, and easier to burn after mixing, and the combustion is more complete, preventing larger coal from failing to burn quickly and fully to produce toxic carbon monoxide and pollute the environment.

[0058] Reference Figure 6 , Figure 7 and Figure 8 As shown, in order to evenly mix the crushed coal blocks 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, and the outer wall of the sleeve 551 is evenly rotatably installed with multiple annularly distributed linkage shafts 552, the inner wall of the mixing cylinder 3 is provided with an annular groove 553, and the inner top wall of the annular groove 553 is installed with a gear ring 554 meshing with multiple gears 556, and the inner wall of the annular groove 553 is rotatably installed with an annular baffle 555, and the linkage shaft 552 rotates through the annular baffle 555 and is fixedly sleeved with a gear 556 meshing with the gear ring 554.

[0059] Furthermore, in this embodiment, a plurality of material shifting groups for stirring and mixing coal and biomass fuel are evenly installed on the outer wall of the linkage shaft 552, and each material shifting group includes a support rod 557 installed on the outer wall of the linkage shaft 552, and a plurality of shifting rods 558 are equidistantly arranged along the length direction on one side of the support rod 557 away from the axis of the linkage shaft 552, and a scraper plate 559 is commonly installed at the ends of the plurality of shifting rods 558 on the same support rod 557.

[0060] It should be noted that the material shifting groups on two adjacent linkage shafts 552 are arranged in a staggered 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 plate 559 away from the lever 558 is an arc-shaped structure, and the running direction of the scraper plate 559 pointing to the linkage shaft 552 is an arc-shaped concave surface for scooping the coal blocks and biomass fuel at the bottom of the mixing barrel 3.

[0062] Furthermore, in order to prolong the stirring and mixing time of coal and biomass fuel so as to enhance the mixing intensity and uniformity, in the present embodiment, a plurality of sealing plates 531 are hingedly connected to the inner wall of the mixing barrel 3 and are arranged alternately 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 a control cylinder 532 is hingedly connected between the bottom of the sealing plate 531 and the inner wall of the mixing barrel 3. In the initial state, the telescopic end of the control cylinder 532 is in an extended state, so that the control cylinder 532 lifts the sealing plate 531 upward and closes the space between the two adjacent extension sections of the cross 53, thereby closing the mixing area in the middle of the mixing barrel 3, thereby achieving sufficient mixing of coal and biomass fuel.

[0063] During the specific implementation process, the rotating shaft 52 rotates while driving multiple linkage shafts 552 to revolve through the sleeve 551. While the linkage shaft 552 revolves, it rotates on its own under the action of the gear 556 and the ring gear 554, and the rotation direction of the linkage shaft 552 is opposite to its revolution direction; during this period, the linkage shaft 552 drives the lever 558 through the support rod 557 to stir and mix the coal blocks and biomass fuel inside the mixing barrel 3. At this time, the sealing of the mixing area in the middle of the mixing barrel 3 by the sealing plate 531 can extend the stirring time of the coal and biomass fuel, thereby achieving sufficient mixing of the coal and biomass fuel; during this process, the linkage shaft 552 drives the scraper plate 559 through the lever 558 to push the coal and biomass fuel accumulated on the sealing plate 531 upward, thereby preventing smaller coal blocks or biomass fuel from depositing downward and affecting the mixing uniformity and subsequent combustion effect, thereby ensuring that the mixed fuel can be fully burned.

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

[0065] Step 2: After the coal enters the mixing barrel 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 again, thereby ensuring that the coal is crushed into blocks of a specified size, making it easier to evenly mix the crushed coal blocks with the biomass fuel, and easier to burn after mixing, and the combustion is more complete, thereby preventing larger coal from failing to burn quickly and completely to produce toxic carbon monoxide and pollute the environment.

[0066] Step 3: 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 rotate on their own under the action of the gear 556 and the ring gear 554, and the rotation direction of the linkage shafts 552 is opposite to their revolution direction. During this period, the linkage shafts 552 drive the lever 558 to stir and mix the coal blocks and biomass fuel inside the mixing barrel 3 through the support rod 557. At this time, the mixing area in the middle of the mixing barrel 3 is closed by the sealing plate 531, which can extend the stirring time of the coal and biomass fuel, thereby achieving sufficient mixing of the coal and biomass fuel.

[0067] During this process, the linkage shaft 552 drives the scraper plate 559 through the lever 558 to push the coal and biomass fuel accumulated on the sealing plate 531 upward, thereby preventing smaller coal blocks or biomass fuel from depositing downward and affecting the mixing uniformity and subsequent combustion effect, thereby ensuring that the mixed fuel can be fully burned.

[0068] Step 4: The control motor 63 is powered on and started through the controller 8. The control motor 63 drives the conveyor belt 62 to operate through the transmission shaft 61. When the coal and biomass fuel are evenly mixed, they fall down along the mixing barrel 3 onto the conveyor belt 62. The mixed fuel can be limited by the clamping strip 66 and the baffle plate 65 to prevent it from spilling. Then, the conveyor belt 62 transports the mixed fuel to the boiler 7 for combustion under the action of the clamping strip 66.

[0069] Step 5: 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 concentration of carbon dioxide in the flue gas can be monitored and fed back to the controller 8 in real time, so that the staff can check 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 positioning cylinder 110 is powered on and started through 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 to slide along the arc hole 105 through the control rod 109, so that the support drives the circular turntable 101 to rotate, so that the circular turntable 101 drives the discharge holes 102 with different widths of the through holes to be connected with the through holes, and the circular turntable 101 drives the discharge holes 102 of different diameters of another feeding group to be connected with the through holes, so that the discharge amount of coal and biomass fuel can be adjusted, and then the input amount of coal and biomass fuel can be adjusted according to the feedback result of the monitor 9.

[0071] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, 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] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A fuel mixing device for a power plant boiler, comprising two brackets (1) parallel to each other, a mixing cylinder (3) being mounted on the upper ends of the two brackets (1) via a positioning rod (2), two through holes being provided on the upper ends of the mixing cylinder (3), two feeding cylinders (4) being mounted on the top of the mixing cylinder (3) and being connected to the through holes, a stirring device (5) for mixing coal and biomass fuel being mounted inside the mixing cylinder (3), a conveying device (6) being arranged below the stirring device (5), a boiler (7) being mounted on the side of the conveying device (6) away from the mixing cylinder (3), characterized in that: A controller (8) is installed on any one of the positioning rods (2), and 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), and the monitor (9) is electrically connected to the controller (8).

2. A power plant boiler fuel mixing device according to claim 1, characterized in that: One end of the bracket (1) is located at the bottom of the mixing drum (3), and the other end is gradually inclined upward and then located above the boiler (7). The conveying device (6) comprises a plurality of transmission shafts (61) rotatably arranged on opposite sides of the two brackets (1). The outer walls of the plurality of transmission shafts (61) are collectively sleeved with a conveyor belt (62). A control motor (63) connected to any transmission shaft (61) is installed on the outer wall of any bracket (1) through a motor cover. The control motor (63) and the controller (8) are electrically connected. In addition, a plurality of positioning shafts (64) for limiting the bending position of the transmission belt are rotatably arranged on the opposite sides of the two brackets (1). Furthermore, in this embodiment, two material blocking plates (65) having the same contour as the conveyor belt (62) are symmetrically mounted on the outer wall of the conveyor belt (62) along the width direction, and a plurality of equidistantly distributed material blocking strips (66) are evenly arranged on the outer wall of the conveyor belt (62), and the material blocking strips (66) are inclined toward the side close to the running direction of the conveyor belt (62).

3. A fuel mixing device for a power plant boiler according to claim 1, characterized in that: The invention also comprises a feeding device (10) for adjusting the amount of fuel input, wherein the feeding device (10) comprises a circular rotating disk (101), the circular rotating disk (101) is rotatably arranged inside the top wall of the mixing barrel (3), two feeding groups are symmetrically arranged on the circular rotating disk (101), each feeding group comprises a plurality of discharge holes (102) evenly distributed along the circumference of the circular rotating disk (101), and the discharge holes (102) have the same diameter as the through hole, and a driving unit (103) for controlling the rotation of the circular rotating disk (101) is installed at the upper end of the mixing barrel (3).

4. A fuel mixing device for a power plant boiler according to claim 3, characterized in that: A plurality of blocking bars (104) are evenly installed on the inner wall of the multiple discharge holes (102) of any one of the feed groups, and a through hole for passing the biomass fuel is formed between two adjacent blocking bars (104). The width of the through holes on the inner wall of the multiple discharge holes (102) of the same feed group decreases in sequence, and the diameter of the multiple discharge holes (102) of another feed group decreases in sequence, and the order of decreasing the through hole width is centrally symmetrical to the order of decreasing the diameter of the discharge hole (102).

5. A fuel mixing device for a power plant boiler according to claim 3, characterized in that: The driving unit (103) comprises an arc-shaped hole (105) formed at the upper end of the mixing cylinder (3), the mixing cylinder (3) being located between the two through holes, a pillar which slides through the arc-shaped hole (105) being installed at the upper end of the circular rotating disk (101), and a positioning sleeve (106) being arranged at the upper end of the pillar; A positioning rail (107) is installed at the upper end of the mixing barrel (3), and a sliding plate (108) is slidably connected to the upper end of the positioning 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) in the length direction close to the positioning rail (107) and the top of the mixing barrel (3), and the positioning cylinder (110) and the controller (8) are electrically connected.

6. A power plant boiler fuel mixing device according to claim 1, characterized in that: The stirring device (5) comprises a driving motor (51) mounted at the middle of the upper end of the mixing barrel (3) via a motor seat, the driving motor (51) being electrically connected to a controller (8), an output shaft at the bottom of the driving motor (51) passing through the mixing barrel (3) and connected to a rotating shaft (52), a cross (53) being mounted on the inner wall of the mixing barrel (3), the bottom of the rotating shaft (52) being rotatably connected to the cross (53), and a crushing unit (54) and an execution unit (55) being mounted in sequence from top to bottom between the rotating shaft (52) and the inner wall of the mixing barrel (3).

7. A fuel mixing device for a power plant boiler according to claim 6, characterized in that: The pulverizing unit (54) comprises two rotating pulverizing disks (541) which are sequentially sleeved on the outer wall of the rotating shaft (52) from top to bottom, and the inner wall of the mixing barrel (3) is provided with two positioning pulverizing rings (542) which respectively correspond to the positions of the rotating pulverizing disks (541), and an annular material drop groove (543) for pulverizing the fuel coal is provided between the rotating pulverizing disks (541) and the positioning pulverizing rings (542) which correspond to the positions, and the diameter of the upper annular material drop groove (543) is smaller than the diameter of the lower annular material drop groove (543); The upper ends of the upper rotating crushing disc (541) and the upper positioning crushing ring (542) are both provided with guide rings (544), and the lower ends of the guide rings (544) are both inclined toward a side close to the annular material dropping trough (543).

8. A fuel mixing device for a power plant boiler according to claim 6, characterized in that: The execution unit (55) comprises a sleeve (551) sleeved on the lower side of the outer wall of the rotating shaft (52); a plurality of annularly distributed linkage shafts (552) are evenly rotatably mounted on the outer wall of the sleeve (551); an annular groove (553) is provided on the inner wall of the mixing cylinder (3); a gear ring (554) meshing with a plurality of gears (556) is mounted on the inner top wall of the annular groove (553); an annular baffle (555) is rotatably mounted on the inner wall of the annular groove (553); and a gear (556) meshing with the gear ring (554) is fixedly mounted on the linkage shaft (552) after the linkage shaft (552) rotates through the annular baffle (555); The outer wall of the linkage shaft (552) is evenly mounted with a plurality of shifting groups for stirring and mixing coal and biomass fuel, each shifting group comprises a support rod (557) mounted on the outer wall of the linkage shaft (552), a plurality of shifting rods (558) are equidistantly arranged along the length direction on one side of the support rod (557) away from the axis of the linkage shaft (552), and a scraper plate (559) is commonly mounted on the ends of the plurality of shifting rods (558) on the same support rod (557).

9. A fuel mixing device for a power plant boiler according to claim 8, characterized in that: The side of the scraper plate (559) away from the lever (558) is an arc-shaped structure, and the scraper plate (559) points to the running direction of the linkage shaft (552) to facilitate scooping up the arc-shaped concave surface of the coal blocks and biomass fuel at the bottom of the mixing barrel (3).

10. A fuel mixing device for a power plant boiler according to claim 6, characterized in that: The inner wall of the mixing cylinder (3) is hinged with a plurality of sealing plates (531) arranged in an alternating manner 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 a control cylinder (532) is hingedly connected between the bottom of the sealing plates (531) and the inner wall of the mixing cylinder (3).

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