Biomass-coal mixed combustion boiler

Abstract

The present application provides a kind of biomass coal powder boiler of mixed combustion, it relates to the field of boiler technology, including boiler body, material box, screening box and filter screen, material box is installed in the outside of boiler body and is equipped with discharge pipe;Screening box is located outside material box, screening box has screening cavity and is equipped with the feed pipe and discharge port of communication screening cavity, material box includes the first side plate towards discharge port, first side plate is equipped with the feed port of communication discharge port and the inner chamber of material box;Filter screen is movably connected with screening cavity along the up and down direction, screening cavity is equipped with support frame, filter screen has the first state of abutting with support frame and the second state of being spaced apart from support frame, and filter screen can screen biomass particle and coal powder mixture when switching between the first state and the second state.The present application can realize the efficient screening of biomass particle and coal powder mixture, to reduce the energy waste and hearth coking problem caused by insufficient combustion due to the entry of large particle material into combustion system.

Description

Technical Field

[0001] This invention relates to the field of boiler technology, and in particular to a biomass-coated pulverized coal boiler. Background Technology

[0002] As core energy-consuming and carbon-emitting devices in the industrial production field, the upgrading of the fuel structure of industrial boilers has become a key part of achieving decarbonization of the energy system. The research, matching and application of zero-carbon fuels have also become an important development trend in boiler equipment technology. Biomass fuel, as a typical carbon-neutral and zero-carbon fuel, has become the preferred solution for the transformation of industrial boiler fuel structure due to its blending with pulverized coal, which takes into account fuel cost, combustion stability and low carbon emission reduction effect. Therefore, biomass-pulverized coal boilers have become a research and development focus in the field of boiler technology.

[0003] In related technologies, due to the large difference in particle size between biomass pellets and pulverized coal, and the fact that biomass pellets are prone to containing large particulate impurities, substandard pulverized coal may also be mixed in and enter the pulverized coal combustion device. After such large biomass particles and substandard pulverized coal enter the combustion system, it will not only lead to incomplete combustion and energy waste, but also easily cause problems such as furnace coking and reduced combustion efficiency. It cannot meet the stable, efficient, and low-carbon operation requirements of biomass-pulverized coal boilers, and is difficult to adapt to the current development direction of industrial boiler fuel structure transformation. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of the present invention propose a biomass-coal pulverized coal boiler, which can achieve efficient screening of the mixture of biomass particles and coal powder to reduce energy waste and furnace coking caused by large particles entering the combustion system and resulting in incomplete combustion.

[0006] According to an embodiment of the present invention, a biomass-coal pulverized coal boiler includes a boiler body, a feed hopper, a screening box, and a filter screen. The feed hopper is installed outside the boiler body and has a discharge pipe adapted to communicate with the combustion chamber of the boiler body to supply feed to the combustion chamber. The screening box is located outside the feed hopper and has a screening chamber with an inlet pipe and an outlet pipe communicating with the screening chamber. The feed hopper includes a first side plate facing the outlet pipe, and the first side plate has an inlet pipe communicating with the outlet pipe and the inner cavity of the feed hopper. The filter screen is movably connected to the screening chamber in a vertical direction. The screening chamber has a support frame, and the filter screen has a first state abutting against the support frame and a second state spaced apart from the support frame. When the filter screen switches between the first state and the second state, it can screen a mixture of biomass particles and pulverized coal.

[0007] According to an embodiment of the biomass-coated pulverized coal boiler of the present invention, a pre-treated mixture of biomass particles and pulverized coal is slowly fed into the screening chamber of a screening box through a feed pipe. After the mixture falls onto the surface of the filter screen, the filter screen switches between a first state and a second state to screen the mixture. Smaller-sized qualified biomass particles and pulverized coal pass smoothly through the mesh of the filter screen and fall to the bottom of the screening box. They then enter the feed hopper for storage through the discharge port and the feed port. Larger-sized biomass particles, impurities, and unqualified pulverized coal are intercepted by the filter screen and remain on the surface of the filter screen. This invention effectively achieves the screening of biomass pellet and pulverized coal mixtures, significantly reducing the entry of large particles into the combustion system. This avoids energy waste and furnace coking caused by incomplete combustion, thereby ensuring the stable, efficient, and low-carbon operation of biomass-pulverized coal boilers. It better adapts to the current development direction of industrial boiler fuel structure transformation. Therefore, compared with related technologies, this invention can achieve efficient screening of biomass pellet and pulverized coal mixtures to reduce energy waste and furnace coking caused by incomplete combustion of large particles.

[0008] In some embodiments, the boiler further includes a reciprocating assembly, which includes a drive member, a cam, and a lifting rod. The drive member is mounted on the screening box, and a fixed frame is provided on the support frame. The cam is pivotally mounted on the fixed frame, and the drive member is drivenly connected to the cam to drive the cam to rotate. A mounting bracket is provided on the fixed frame, and the lifting rod is movably connected to the mounting bracket. A contact plate is provided at the bottom of the lifting rod, and one end of the contact plate opposite to the lifting rod contacts the outer peripheral surface of the cam. When the cam rotates, it drives the lifting rod to move up and down relative to the support frame in the vertical direction to switch the filter screen between the first state and the second state.

[0009] In some embodiments, the contact plate has a first surface and a second surface arranged opposite to each other along the vertical direction. The first surface of the contact plate is connected to the bottom surface of the lifting rod, and the second surface of the contact plate is in rolling contact with the outer peripheral surface of the cam. The second surface of the contact plate is an arc-shaped surface and protrudes toward the side away from the lifting rod.

[0010] In some embodiments, the lifting rod has a first position and a second position, and the lifting rod is capable of sliding relative to the support frame in the vertical direction from the first position to the second position, so that the filter screen switches from the first state to the second state;

[0011] The boiler also includes an elastic element, and a fixed plate is provided on the lifting rod. The elastic element is clamped between the mounting frame and the fixed plate and can press the lifting rod toward the first position.

[0012] In some embodiments, the elastic element is a spring, which is sleeved on the lifting rod and is capable of extending and retracting in the vertical direction.

[0013] In some embodiments, there are two reciprocating components arranged at intervals on the support frame, and the boiler further includes a connecting rod that connects between the cams of the two reciprocating components so that the two cams can move synchronously.

[0014] In some embodiments, the support frame has a through hole extending through the support frame along its thickness direction, and the boiler further includes a movable rod, at least a portion of which is movably connected to the through hole in the vertical direction, and one end of the movable rod opposite to the support frame is connected to the filter screen.

[0015] In some embodiments, the movable rods are at least two pairs, and the at least two pairs of movable rods are arranged at intervals on the support frame.

[0016] In some embodiments, the movable rod extends along the vertical direction, the thickness direction of the support frame is consistent with the vertical direction, and the length of the movable rod is greater than the thickness of the support frame.

[0017] In some embodiments, the end of the feed pipe opposite to the screening chamber is a funnel-shaped opening.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] Figure 1 This is a first-view structural schematic diagram of a biomass-coated pulverized coal boiler according to an embodiment of the present invention.

[0020] Figure 2 This is a second-view structural schematic diagram of a biomass-coated pulverized coal boiler according to an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the connection structure between the feed box and the screening box in a biomass pulverized coal boiler according to an embodiment of the present invention (the feed box is cut in the figure).

[0022] Figure 4 This is an exploded structural diagram of the screening box and filter screen in a biomass-coated pulverized coal boiler according to an embodiment of the present invention.

[0023] Figure 5 yes Figure 4 A magnified schematic diagram of the structure at point A in the middle.

[0024] Figure 6 yes Figure 4Enlarged schematic diagram of the local structure at point B Figure label: 1. Boiler body; 2. Feed box; 3. Discharge pipe; 4. Screening box; 5. Feed pipe; 6. Support frame; 7. Filter screen; 8. Moving rod; 9. Through hole; 10. Fixing frame; 11. Mounting frame; 12. Lifting rod; 13. Contact plate; 14. Fixing plate; 15. Elastic element; 16. Cam; 17. Connecting rod; 18. Motor; 19. Discharge port; 20. Feed port. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] like Figures 1 to 3 As shown, an embodiment of the present invention discloses a biomass-coal pulverized coal boiler, comprising a boiler body 1, a feed box 2, a screening box 4, and a filter screen 7. The feed box 2 is installed outside the boiler body 1 and is provided with a discharge pipe 3, which is adapted to communicate with the combustion chamber of the boiler body 1 to supply feed to the combustion chamber of the boiler body 1. The screening box 4 is located outside the feed box 2 and has a screening chamber and is provided with a feed pipe 5 and a discharge port 19 communicating with the screening chamber. The feed box 2 includes a first side plate facing the discharge port 19, and the first side plate is provided with a feed inlet 20 communicating with the discharge port 19 and the inner cavity of the feed box 2. The filter screen 7 is movably connected to the screening chamber in the vertical direction. The screening chamber is provided with a support frame 6. The filter screen 7 has a first state abutting against the support frame 6 and a second state spaced apart from the support frame 6. When the filter screen 7 switches between the first state and the second state, it can screen a mixture of biomass particles and coal pulverized coal.

[0027] According to an embodiment of the present invention, a biomass-coated pulverized coal boiler slowly feeds a pre-treated mixture of biomass particles and pulverized coal into the screening chamber of a screening box 4 through a feed pipe 5. After the mixture falls onto the surface of a filter screen 7, the filter screen 7 switches between a first state and a second state to screen the mixture. Smaller-sized, qualified biomass particles and pulverized coal pass smoothly through the mesh of the filter screen 7 and fall to the bottom of the screening box 4. They then enter the feed bin 2 through the discharge port 19 and the feed port 20 for storage. Larger-sized biomass particles, impurities, and unqualified pulverized coal are intercepted by the filter screen 7 and remain on the filter. The mesh 7 surface effectively achieves the screening of the mixture of biomass pellets and pulverized coal, significantly reducing the entry of large particles into the combustion system. This avoids energy waste and furnace coking caused by incomplete combustion, thus ensuring the stable, efficient, and low-carbon operation of the biomass-pulverized coal boiler. It is better suited to the current development direction of industrial boiler fuel structure transformation. Therefore, compared with related technologies, this invention can achieve efficient screening of the mixture of biomass pellets and pulverized coal, reducing energy waste and furnace coking caused by incomplete combustion of large particles.

[0028] Specifically, the bottom of the material bin 2 is equipped with a discharge pipe 3. The end of the discharge pipe 3 away from the material bin 2 can be connected to the combustion chamber of the boiler body 1 through a conveying mechanism, so that the qualified mixture stored in the material bin 2 can be transported to the combustion chamber for co-firing as needed. A screening box 4 is installed on one side of the material bin 2. The top of the screening box 4 is equipped with a feed pipe 5, and its side wall has a discharge port 19. The side wall of the material bin 2 has a corresponding feed port 20. The filter screen 7, the support frame 6, and the discharge port 19 are arranged sequentially from top to bottom.

[0029] like Figure 4 and Figure 5 As shown, in some embodiments, the boiler also includes a reciprocating assembly, which includes a drive member, a cam 16, and a lifting rod 12. The drive member is mounted on the screening box 4, and a fixed frame 10 is provided on the support frame 6. The cam 16 is pivotally mounted on the fixed frame 10, and the drive member is connected to the cam 16 to drive the cam 16 to rotate. A mounting frame 11 is provided on the fixed frame 10, and the lifting rod 12 is movably connected to the mounting frame 11. A contact plate 13 is provided at the bottom of the lifting rod 12, and one end of the contact plate 13 away from the lifting rod 12 contacts the outer peripheral surface of the cam 16. When the cam 16 rotates, it drives the lifting rod 12 to move up and down relative to the support frame 6 in the vertical direction so that the filter screen 7 switches between a first state and a second state.

[0030] Understandably, during use, the drive unit is activated, causing the cam 16 to rotate. Due to the eccentric structure of the cam 16, its outer circumferential surface (or outer wall) continuously abuts against the contact plate 13 during rotation. When the long-diameter end of the cam 16 contacts the contact plate 13, it pushes the contact plate 13 upward, thereby causing the lifting rod 12 to slide upward along the mounting bracket 11. At this time, the top of the lifting rod 12 contacts the bottom of the filter screen 7 frame, thus lifting the filter screen 7 upward. When the short-diameter end of the cam 16 rotates to the position opposite to the contact plate 13, the lifting rod 12 will cause the contact plate 13 to return to its original position downward, and the filter screen 7 will also descend due to its own gravity. This cycle repeats, with the cam 16... Under continuous rotation, the filter screen 7 achieves reciprocating vibration in the up and down direction. This continuous reciprocating vibration allows the mixture of biomass pellets and coal powder fed into the screening box 4 to pass smoothly through the mesh of the filter screen 7 after entering the filter screen 7 through the feed pipe 5. The smaller-sized qualified coal powder and biomass pellets can fall to the bottom of the screening box 4 through the mesh of the filter screen 7 and enter the material box 2 through the discharge port 19 on the side wall of the screening box 4 and the feed port 20 on the side wall of the material box 2 for storage, waiting to enter the combustion chamber of the boiler body 1 for combustion. The larger-sized biomass pellets, impurities and unqualified coal powder are intercepted by the filter screen 7 and remain on the surface of the filter screen 7, effectively realizing the screening treatment of the mixture of biomass pellets and coal powder.

[0031] Specifically, the driving component is not limited to motor 18, which can be mounted on the outer wall of screening box 4. A mounting bracket 10 can be installed at the bottom of support frame 6. A reciprocating assembly is mounted on the mounting bracket 10 to drive the filter screen 7 to reciprocate in the vertical direction. At least two mounting brackets 11 can be arranged at intervals in the vertical direction, and the mounting brackets 11 are located above cam 16.

[0032] like Figure 5 As shown, in some embodiments, the contact plate 13 has a first surface and a second surface arranged opposite to each other in the vertical direction. The first surface of the contact plate 13 is connected to the bottom surface of the lifting rod 12, and the second surface of the contact plate 13 is in rolling contact with the outer peripheral surface of the cam 16. The second surface of the contact plate 13 is an arc-shaped surface and protrudes toward the side away from the lifting rod 12. In other words, the contact plate 13 is a contact plate 13.

[0033] It is understandable that designing the second surface of the contact plate 13 to make rolling contact with the outer peripheral surface of the cam 16 can reduce wear on the contact plate 13, avoid interference of friction on the smooth transmission between the cam 16 and the contact plate 13, and ensure the working performance of the reciprocating assembly.

[0034] like Figure 5 As shown, in some embodiments, the lifting rod 12 has a first position and a second position. The lifting rod 12 can slide relative to the support frame 6 in the vertical direction from the first position to the second position, so that the filter screen 7 switches from the first state to the second state.

[0035] The boiler also includes an elastic element 15, and a fixing plate 14 is provided on the lifting rod 12. The elastic element 15 is clamped between the mounting frame 11 and the fixing plate 14 and can press the lifting rod 12 toward the first position. The fixing plate 14 is fixed to the outer wall of the lifting rod 12 and is located below the mounting frame 11.

[0036] Understandably, when the lifting rod 12 slides upward under the push of the cam 16, the fixed plate 14 moves upward synchronously. At this time, the elastic element 15 is compressed by the pressure of the fixed plate 14 and stores elastic potential energy. When the short diameter end of the cam 16 is opposite to the contact plate 13, the upward pushing force of the cam 16 on the contact plate 13 disappears, and the elastic element 15 in the compressed state begins to release elastic potential energy, pushing the fixed plate 14 downward, thereby driving the lifting rod 12 and the contact plate 13 to quickly return to their original positions. This ensures that the contact plate 13 is always in close contact with the outer peripheral surface (i.e., the outer wall) of the cam 16. The setting of the elastic element 15 not only speeds up the return speed of the lifting rod 12 and ensures the frequency and amplitude stability of the filter screen 7 vibration, but also effectively buffers the impact force between the cam 16 and the contact plate 13, reduces the wear of the parts during the reciprocating motion, and extends the service life of the reciprocating assembly.

[0037] like Figure 5 As shown, in some embodiments, the elastic element 15 is a spring, which is sleeved on the lifting rod 12 and can extend and retract in the vertical direction. Compared with the spring being arranged adjacent to the lifting rod 12, the spring is prone to torsion. The aforementioned structural design can ensure the smooth extension and retraction of the spring in the vertical direction. The two ends of the spring can respectively abut against a mounting bracket 11 and a fixing plate 14.

[0038] like Figure 4 and Figure 5 As shown, in some embodiments, there are two reciprocating components arranged at intervals on the support frame 6. The boiler also includes a connecting rod 17, which connects between the cams 16 of the two reciprocating components so that the two cams 16 can move synchronously.

[0039] Understandably, through the connection of the connecting rod 17, when the motor 18 drives one of the cams 16 to rotate, the other cam 16 will rotate synchronously under the drive of the connecting rod 17, ensuring that the cams 16 of the two sets of reciprocating components can maintain the same speed and phase. This synchronous rotation allows the lifting rods 12 on both sides to simultaneously apply an upward thrust and a downward restoring force to the filter screen 7, ensuring that the filter screen 7 is subjected to uniform force during the up-and-down reciprocating movement, avoiding the phenomenon of the filter screen 7 tilting or jamming due to asynchronous movement on both sides, further improving the stability and reliability of the vibrating screening of the filter screen 7, and ensuring that the screening work can be carried out continuously and efficiently.

[0040] Specifically, the cam 16 can be pivotally connected to the fixed frame 10 via a rotating shaft, and the end of the connecting rod 17 is connected to the rotating shaft of the two cams 16 to drive the two cams 16 to move synchronously. There can be two fixed frames 10, each corresponding to a reciprocating assembly.

[0041] like Figure 6 As shown, in some embodiments, the support frame 6 is provided with a through hole 9 extending through the support frame 6 along its thickness direction, and the boiler also includes a movable rod 8, at least a portion of which is movably connected to the through hole 9 in the vertical direction, and one end of the movable rod 8 away from the support frame 6 is connected to the filter screen 7.

[0042] Understandably, when the filter screen 7 moves up and down in a reciprocating motion driven by the reciprocating assembly, the moving rod 8 will slide up and down synchronously along the inner wall of the through hole 9. The cooperation between the moving rod 8 and the through hole 9 plays a guiding role, which can effectively limit the movement trajectory of the filter screen 7 and ensure that the filter screen 7 always moves in a reciprocating motion in the up and down direction, thus preventing the filter screen 7 from shifting or shaking in the horizontal direction during vibration.

[0043] Specifically, a movable rod 8 is fixed at the bottom of the frame of the filter screen 7, and a through hole 9 is provided on the support frame 6 for the movable rod 8 to pass through.

[0044] like Figures 4 to 6 As shown, in some embodiments, there are at least two pairs of movable rods 8, which are arranged at intervals on the support frame 6.

[0045] Understandably, the multiple pairs of moving rods 8 further enhance the stability of the filter screen 7's movement, enabling the filter screen 7 to maintain structural stability even during high-frequency vibration, preventing the sieving effect from being affected by the shaking of the filter screen 7, and also avoiding unnecessary collisions and friction between the filter screen 7 and the inner wall of the screening box 4 or the support frame 6, thus extending the service life of the filter screen 7.

[0046] like Figure 6 As shown, in some embodiments, the movable rod 8 extends in the vertical direction, the thickness direction of the support frame 6 is consistent with the vertical direction, and the length of the movable rod 8 is greater than the thickness of the support frame 6.

[0047] Understandably, the length of the moving rod 8 is greater than the thickness of the support frame 6. This design ensures that the moving rod 8 will not completely detach from the through hole 9 during the up-and-down vibration of the filter screen 7. When the filter screen 7 is lifted upward by the reciprocating assembly, the bottom of the moving rod 8 can still remain within the through hole 9 for a certain length, preventing the filter screen 7 from losing the guiding function of the support frame 6 due to excessive upward movement. When the filter screen 7 returns to its lowest position, the top of the moving rod 8 will not be obstructed by the support frame 6, thus ensuring the smoothness and continuous guidance of the filter screen 7 throughout the reciprocating motion and further improving the stability of the vibrating screening of the filter screen 7.

[0048] like Figures 2 to 4 As shown, in some embodiments, the end of the feed pipe 5 away from the screening chamber is a funnel-shaped opening end; in other words, the feed pipe 5 is a cube with a funnel-shaped opening.

[0049] Understandably, the funnel-shaped top opening design can effectively expand the material receiving area, facilitate the centralized feeding of the mixture of biomass pellets and coal powder, reduce the waste of material during the feeding process, and at the same time, the cubic structure can also facilitate the formation of smooth material channels inside, so that the fed mixture can fall quickly and evenly onto the filter screen 7 below, avoiding material accumulation or blockage due to the complex internal structure of the feed pipe 5, and ensuring the continuous operation of the screening work.

[0050] Therefore, compared with related technologies, this invention achieves efficient classification and screening of biomass pellets and pulverized coal mixtures by setting a screening box 4 with a reciprocating vibrating filter screen 7 on one side of the feed box 2 of the boiler body 1. The reciprocating component drives the cam 16 to rotate through the motor 18, and with the elastic reset effect of the spring, it drives the filter screen 7 to perform stable vertical reciprocating vibration. Combined with the guiding structure of the moving rod 8 and the through hole 9, it ensures that the filter screen 7 is subjected to uniform force and has a stable trajectory during vibration, effectively avoiding tilting or jamming. This design can accurately separate qualified small-diameter fuel and large-particle impurities, significantly reducing the entry of large particles into the combustion system, thereby avoiding energy waste and furnace coking problems caused by incomplete combustion, ensuring the stable, efficient, and low-carbon operation of the biomass pulverized coal boiler, and better adapting to the current development direction of industrial boiler fuel structure transformation.

[0051] The working process of this biomass-coated pulverized coal boiler, taking motor 18 as the driving component, is explained below, based on its specific structure: When in use, start the motor 18, which drives one of the cams 16 to rotate. Through the transmission action of the connecting rod 17, the cams 16 of the two sets of reciprocating components rotate synchronously. The eccentric structure of the cam 16 causes its outer wall to continuously abut against the contact plate 13, thereby driving the lifting rod 12 to slide up and down along the mounting frame 11. Under the push of the lifting rod 12 and the cooperation of its own gravity and spring, the filter screen 7 achieves stable up and down reciprocating vibration. At the same time, the moving rod 8 slides synchronously along the through hole 9 on the support frame 6, which guides and stabilizes the movement of the filter screen 7, preventing the filter screen 7 from tilting or shaking. Next, the pretreated biomass pellets and coal powder mixture is slowly fed into the screening box 4 through the feed pipe 5 (funnel-shaped opening facilitates centralized material feeding and reduces scattering). After the mixture falls onto the surface of the vibrating filter screen 7, under the continuous vibration of the filter screen 7, the smaller-sized qualified coal powder and biomass pellets pass smoothly through the mesh of the filter screen 7 and fall to the bottom of the screening box 4. Then, they enter the material box 2 for storage and standby through the discharge port 19 on the side wall of the screening box 4 and the inlet 20 on the side wall of the material box 2. The larger-sized biomass pellets, impurities and unqualified coal powder are intercepted by the filter screen 7 and remain on the surface of the filter screen 7. After the screening operation has continued for a period of time, the motor 18 can be turned off to clean the trapped material on the surface of the filter screen 7 to avoid clogging of the mesh of the filter screen 7 and ensure the subsequent screening efficiency. The qualified mixture stored in the material box 2 can be transported to the boiler body 1 as needed through the discharge pipe 3 at the bottom of the material box 2 for co-firing. During the entire use process, the spring not only speeds up the reset speed of the lifting rod 12 and ensures the stability of the vibration frequency and amplitude of the filter screen 7, but also buffers the impact force between the cam 16 and the contact plate 13, reducing the wear of parts. The connecting rod 17 ensures that the two sets of reciprocating components move synchronously, avoiding uneven force on the filter screen 7. The cooperation between the moving rod 8 and the through hole 9 further improves the vibration stability of the filter screen 7 and extends the overall service life of the device. After use, turn off motor 18, stop material feeding, clean the remaining material at the bottom of screening box 4 and the trapped material on the surface of filter screen 7, check whether there is wear or looseness in each component, and perform maintenance and upkeep in a timely manner to ensure that the device can operate stably the next time it is used. The whole process revolves around the classification, screening, stable conveying and efficient co-firing of biomass and pulverized coal, which effectively solves the problems of incomplete combustion and coking in the furnace in the existing technology, realizes the stable, efficient and low-carbon operation of the boiler, and adapts to the needs of industrial boiler fuel structure transformation.

[0052] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0056] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0057] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A biomass-coated pulverized coal boiler, characterized in that, include: The boiler body and the feed hopper are provided. The feed hopper is installed outside the boiler body and is provided with a discharge pipe. The discharge pipe is adapted to communicate with the combustion chamber of the boiler body to supply fuel to the combustion chamber of the boiler body. A screening box is disposed outside the material box. The screening box has a screening chamber and is provided with an inlet pipe and an outlet that communicate with the screening chamber. The material box includes a first side plate facing the outlet. The first side plate is provided with an inlet that communicates with the outlet and the inner cavity of the material box. A filter screen is movably connected to the screening chamber in the vertical direction. The screening chamber is provided with a support frame. The filter screen has a first state that abuts against the support frame and a second state that is spaced apart from the support frame. When the filter screen switches between the first state and the second state, it can screen a mixture of biomass particles and coal powder.

2. The biomass-coated pulverized coal boiler according to claim 1, characterized in that, It also includes a reciprocating component, which includes: A drive unit and a cam are provided, wherein the drive unit is mounted on the screening box, a fixed frame is provided on the support frame, the cam is pivotally mounted on the fixed frame, and the drive unit is connected to the cam drive to drive the cam to rotate; The lifting rod has a mounting bracket on the fixed frame, and the lifting rod is movably connected to the mounting bracket. The bottom of the lifting rod has a contact plate, and the end of the contact plate opposite to the lifting rod contacts the outer peripheral surface of the cam. When the cam rotates, it drives the lifting rod to move up and down relative to the support frame in the vertical direction so that the filter screen switches between the first state and the second state.

3. The biomass-coated pulverized coal boiler according to claim 2, characterized in that, The contact plate has a first surface and a second surface arranged opposite to each other along the vertical direction. The first surface of the contact plate is connected to the bottom surface of the lifting rod, and the second surface of the contact plate is in rolling contact with the outer peripheral surface of the cam. The second surface of the contact plate is an arc-shaped surface and protrudes toward the side away from the lifting rod.

4. The biomass-coated pulverized coal boiler according to claim 2, characterized in that, The lifting rod has a first position and a second position. The lifting rod can slide relative to the support frame in the vertical direction from the first position to the second position, so that the filter screen switches from the first state to the second state. The boiler also includes an elastic element, and a fixed plate is provided on the lifting rod. The elastic element is clamped between the mounting frame and the fixed plate and can press the lifting rod toward the first position.

5. The biomass-coated pulverized coal boiler according to claim 4, characterized in that, The elastic element is a spring, which is sleeved on the lifting rod and can extend and retract in the vertical direction.

6. The biomass-blended pulverized coal boiler according to any one of claims 2-5, characterized in that, The reciprocating assembly comprises two components arranged at intervals on the support frame. The boiler also includes a connecting rod that connects between the cams of the two reciprocating assemblies to enable the two cams to move synchronously.

7. The biomass-coated pulverized coal boiler according to claim 1, characterized in that, The support frame is provided with a through hole extending through the support frame along its thickness direction. The boiler also includes a movable rod, at least a portion of which is movably connected to the through hole in the vertical direction. One end of the movable rod away from the support frame is connected to the filter screen.

8. The biomass-coated pulverized coal boiler according to claim 7, characterized in that, The movable rods are in at least two pairs, and the at least two pairs of movable rods are arranged at intervals on the support frame.

9. The biomass-coated pulverized coal boiler according to claim 7 or 8, characterized in that, The movable rod extends along the vertical direction, the thickness direction of the support frame is consistent with the vertical direction, and the length of the movable rod is greater than the thickness of the support frame.

10. The biomass-coated pulverized coal boiler according to claim 1, characterized in that, The end of the feed pipe opposite to the screening chamber has a funnel-shaped opening.

Images