Boiler with multi-fuel intelligent blending combustion device

Abstract

The invention discloses a boiler with a multi-fuel intelligent blending combustion device, and relates to the technical field of boilers, the boiler comprises a boiler and a spiral conveyor, the feeding end of a discharging shell is connected with a kneading mechanism, the feeding end of the kneading mechanism is connected with a wrapping mechanism, and the feeding end of the wrapping mechanism is connected with a hedging mixing mechanism; according to the system, pulverized coal and dry sludge are converted into high-performance standardized fuel through a three-stage refining process of hedging mixing, melting wrapping and rotational flow kneading, and firstly, superfine uniform mixing of fuel components is achieved in a hedging mixing section; then coating the core-shell particles with a uniform functional coat on the wrapping section to form core-shell particles with stable structures; and finally, ultimate shaping and compacting are carried out in the kneading section through powerful rotational flow, the process thoroughly solves the problems that mixed fuel is easy to separate and asynchronous in combustion, the produced core-shell fuel has the remarkable advantages of high combustion synchronism, high burn-off rate and low pollutant emission, and the spanning from low-quality fuel to efficient and clean combustion is realized.

Description

Technical Field

[0001] This invention relates to the field of boiler technology, and in particular to a boiler with a multi-fuel intelligent blending device. Background Technology

[0002] A boiler is an energy conversion device. The energy input to a boiler includes the chemical energy of fuel and electrical energy. The boiler outputs steam, high-temperature water or organic heat carrier with a certain amount of thermal energy. Boilers include coal-fired boilers.

[0003] Currently, the mainstream fuel for coal-fired boilers remains pulverized coal or coal lumps. When attempting to co-fire dry sludge to achieve waste resource utilization, simple mechanical mixing methods are commonly used. However, due to significant differences in density, particle size, shape, and surface characteristics between coal and dry sludge, this simple physical mixing cannot achieve uniform bonding at the microscale, leading to easy fuel segregation and separation during transportation and combustion. The direct consequence is that the two fuels exhibit asynchronous heterogeneous combustion in the furnace, with volatile matter release being severely disconnected from the coke burnout stage, ultimately causing a series of operational problems such as decreased boiler combustion efficiency and deteriorated stability. Therefore, to address these issues, a boiler with a multi-fuel intelligent co-firing device is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a boiler with a multi-fuel intelligent blending device to solve the problems in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A boiler with a multi-fuel intelligent blending device includes a boiler and a screw conveyor. The screw conveyor is connected to the feed end of the boiler. The feed end of the screw conveyor is connected to a discharge shell. The feed end of the discharge shell is connected to a kneading mechanism. The feed end of the kneading mechanism is connected to a wrapping mechanism. The feed end of the wrapping mechanism is connected to a counter-flushing mixing mechanism. The counter-mixing mechanism is used to mix pulverized coal with dry sludge powder to form mixed fuel particles; The encapsulation mechanism is used to include a layer of molten medium on the outside of the mixed fuel; The kneading mechanism is used to knead and compress the mixed fuel containing the molten medium into dense, homogeneous particles, forming a core-shell encapsulated fuel.

[0006] Preferably, a second insulation pipe is fixedly connected to the outer side of the screw conveyor, a second air inlet pipe is fixedly connected to the top of the second insulation pipe, a second air outlet pipe is fixedly connected to the side of the second insulation pipe, a second temperature sensor is fixedly connected to the inner side of the second insulation pipe, and a first support leg is fixedly connected to the bottom of the second insulation pipe.

[0007] Preferably, the counter-mixing mechanism includes a three-way pipe, with a dispersing cylinder fixedly connected to both ends of the three-way pipe. A cylinder cover is fixedly connected to the top of the dispersing cylinder, and a first air inlet pipe is fixedly connected to the top of the cylinder cover. A first feed pipe is fixedly connected to the side of the dispersing cylinder, and a second support leg is fixedly connected to the bottom of the three-way pipe. The first air inlet pipe is connected to an external air source, and the two first feed pipes are respectively connected to a coal powder conveying pipe and a dry sludge conveying pipe. The other discharge end of the three-way pipe is connected to the feed end of the wrapping mechanism.

[0008] Preferably, a first motor is fixedly connected to the bottom end of the dispersing cylinder, a turntable that is rotatably connected to the dispersing cylinder is fixedly connected to the end of the main shaft of the first motor, and a dispersing rod is fixedly connected to the top end of the turntable.

[0009] Preferably, the wrapping mechanism includes an inner tube fixedly connected to a three-way tube, a middle tube fixedly connected to the outer side of the inner tube, an annular cavity between the inner tube and the middle tube, a second feed tube fixedly connected to the top end of the middle tube, and the outlet end of the middle tube communicating with the feed tube of the kneading mechanism.

[0010] Preferably, a first insulation pipe is fixedly connected to the outer side of the middle tube, a first temperature sensor is fixedly connected to the inner side of the first insulation pipe, a second air inlet pipe is fixedly connected to the top of the first insulation pipe, and a first air outlet pipe is fixedly connected to the side of the first insulation pipe.

[0011] Preferably, the kneading mechanism includes a conical cylinder, a third support leg is fixedly connected to the bottom end of the conical cylinder, a guide cylinder is rotatably connected to the inner side of the conical cylinder, a spiral kneading frame is fixedly connected to the outer side of the guide cylinder, a material passage groove is opened on the inner side of the guide cylinder, and a feeding groove communicating with the material passage groove is opened at the contact point between the spiral kneading frame and the guide cylinder.

[0012] Preferably, a transition cylinder is fixedly connected to the outlet end of the central tube, a second motor is fixedly connected to one end of the transition cylinder, a gear is fixedly connected to the end of the main shaft of the second motor, a gear is meshed with a gear ring at one end of the gear, the gear ring is fixed to the outside of the guide cylinder, and a filter screen is embedded on the surface of the transition cylinder.

[0013] Preferably, the radial distance between the inner wall of the spiral kneading frame and the inner wall of the conical cylinder gradually decreases from the feed end to the discharge end of the conical cylinder.

[0014] Compared with the prior art, the present invention has the following beneficial effects: A boiler with a multi-fuel intelligent blending device is equipped with a counter-mixing mechanism, a coating mechanism, and a kneading mechanism. Through a three-stage refining process—counter-mixing → melt coating → swirling kneading—coal powder and dry sludge are converted into high-performance standardized fuel. The system first achieves ultra-fine homogenization of fuel components in the counter-mixing section; then, in the coating section, it coats the fuel with a uniform functional coating, forming structurally stable core-shell particles; finally, in the kneading section, it achieves final shaping and compaction through powerful swirling. This process completely solves the problems of easy separation and asynchronous combustion of mixed fuels. The resulting core-shell fuel has significant advantages such as high combustion synchronization, high burnout rate, and low pollutant emissions, achieving a leap from low-quality fuel to efficient and clean combustion. Attached Figure Description

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Figure 1 This is a schematic diagram of the overall structure of a boiler with a multi-fuel intelligent blending device according to the present invention.

[0017] Figure 2 This is a cross-sectional structural schematic diagram of the wrapping mechanism of a boiler with a multi-fuel intelligent blending device according to the present invention.

[0018] Figure 3 This is a schematic diagram of the installation structure of the second temperature sensor in the multi-fuel intelligent blending device of the present invention.

[0019] Figure 4 This is a schematic diagram of the installation structure of the three-way pipe of a boiler with a multi-fuel intelligent blending device according to the present invention.

[0020] Figure 5 This is a schematic diagram of the installation structure of the dispersing rod of a boiler with a multi-fuel intelligent blending device according to the present invention.

[0021] Figure 6 This is a schematic diagram of the installation structure of the middle tube of a boiler with a multi-fuel intelligent blending device according to the present invention.

[0022] Figure 7 This is a schematic diagram of the installation structure of the spiral kneading frame of a boiler with a multi-fuel intelligent blending device according to the present invention.

[0023] Figure 8 This is a schematic diagram of the installation structure of a screw conveyor for a boiler with a multi-fuel intelligent blending device according to the present invention.

[0024] In the diagram: 1. Counter-mixing mechanism; 101. T-connector; 102. Dispersing cylinder; 103. First motor; 104. Turntable; 105. Dispersing rod; 106. First air inlet pipe; 107. Cylinder cover; 108. First feed pipe; 2. Packaging mechanism; 201. Inner tube; 202. Middle tube; 203. Second feed pipe; 204. First insulation pipe; 205. Second air inlet pipe; 206. First air outlet pipe; 207. First temperature sensor; 3. Kneading mechanism; 301. Transition cylinder; 302. Guide cylinder; 303. Gear ring; 304. Gear; 305. Second motor; 306. Spiral kneading frame; 307. Feed chute; 308. Passing chute; 309. Conical cylinder; 310. Filter screen; 4. Second air inlet pipe; 5. Screw conveyor; 6. Second insulation pipe; 7. Second air outlet pipe; 8. First support leg; 9. Feeding shell; 10. Second support leg; 11. Third support leg; 12. Boiler; 13. Second temperature sensor. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the specific embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size. At the same time, all precision instruments such as lead screws, screws, gears, racks, etc. are provided with protective structures such as protective covers. As these are common knowledge, they are not described in detail in the specification. It is understandable for those skilled in the art that some common structures and their descriptions may be omitted in the drawings. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] To make the technical means, creative features, objectives, and effects of this invention easier to understand, it should be noted in the description of this invention that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not 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. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The invention will be further described below in conjunction with specific embodiments.

[0027] Example

[0028] like Figures 1-8 As shown, a boiler with a multi-fuel intelligent blending device includes a boiler 12 and a screw conveyor 5. The screw conveyor 5 is connected to the feed end of the boiler 12, and the feed end of the screw conveyor 5 is connected to a discharge shell 9. The feed end of the discharge shell 9 is connected to a kneading mechanism 3, the feed end of the kneading mechanism 3 is connected to a wrapping mechanism 2, and the feed end of the wrapping mechanism 2 is connected to a counter-mixing mechanism 1. The core-shell wrapped fuel, processed by the kneading mechanism 3 and finally shaped, falls into the feed port of the screw conveyor 5 located below it through the guide channel of the discharge shell 9 under the action of gravity. Subsequently, the screw conveyor 5, as a closed conveying device, stably and continuously transports the fuel to the dedicated feed port of the boiler 12 and injects it directionally into the boiler combustion chamber, completing a seamless connection from fuel preparation to combustion in the furnace. The hedging mixing mechanism 1 is used to mix pulverized coal with dry sludge powder to form mixed fuel particles; The encapsulation mechanism 2 is used to include a layer of molten medium, such as paraffin, polymers with a specific melting point, or modified bitumen, on the outside of the mixed fuel. The molten medium is heated to just above its melting point (e.g., 70-120°C) to maintain a low-viscosity fluid state.

[0029] The kneading mechanism 3 is used to knead and compress the mixed fuel containing the molten medium into dense, homogeneous particles, forming a core-shell encapsulated fuel.

[0030] As a further improvement to the present invention, such as Figure 1 , Figure 3 and Figure 8 As shown, a second insulation pipe 6 is fixedly connected to the outer side of the screw conveyor 5. A second air inlet pipe 4 is fixedly connected to the top of the second insulation pipe 6, a second air outlet pipe 7 is fixedly connected to the side of the second insulation pipe 6, a second temperature sensor 13 is fixedly connected to the inner side of the second insulation pipe 6, and a first support leg 8 is fixedly connected to the bottom of the second insulation pipe 6. To ensure the temperature of the fuel encased in the shell before entering the furnace and to promote its rapid ignition, the system is designed with a closed-loop environmental heating circuit based on the waste heat of the flue gas. Specifically, the second air inlet pipe 4 is connected to the low-temperature flue gas duct at the tail of the boiler 12, which is filtered by dust removal, introducing flue gas at approximately 120-180°C and allowing it to flow through the outer side of the screw conveyor 5, thereby achieving continuous and indirect heating of the fuel inside the screw conveyor 5. The second temperature sensor 13 monitors the temperature of the fuel or the wall of the screw conveyor 5 in real time and is connected to the central control cabinet via a data cable. Operators can preset the temperature setpoint and alarm threshold in the control system according to the optimal ignition temperature requirements. When the monitored temperature is lower than the set value, the control system can automatically adjust the opening of the flue gas valve to precisely maintain the fuel in the best preheated state and ensure that it can be quickly ignited after entering the furnace.

[0031] As a further improvement to the present invention, such as Figure 2 and Figure 4 As shown, the counter-mixing mechanism 1 includes a three-way pipe 101, with a dispersing cylinder 102 fixedly connected to both ends of the three-way pipe 101. A cylinder cover 107 is fixedly connected to the top of the dispersing cylinder 102, and a first air inlet pipe 106 is fixedly connected to the top of the cylinder cover 107. A first feed pipe 108 is fixedly connected to the side of the dispersing cylinder 102. A second support leg 10 is fixedly connected to the bottom of the three-way pipe 101. The first air inlet pipe 106 is connected to an external air source. The two first feed pipes 108 are respectively connected to a coal powder conveying pipe and a dry sludge conveying pipe. The other outlet end of the three-way pipe 101 is connected to the feed end of the wrapping mechanism 2. When the mixing program of coal powder and dry sludge powder is started, the two raw materials are respectively conveyed to the corresponding dispersing cylinder 102 for preliminary dispersion through the symmetrically arranged first feed pipes 108. Subsequently, the high-pressure carrier gas from the first intake pipe 106 carries the two dispersed powder streams and collides them at high speed and head-on at the confluence center of the three-way pipe 101. This process utilizes the extreme turbulence and shear force field generated by the collision to force the two particles with vastly different physical properties to undergo intense impact, friction, and interlocking at the microscopic scale, thereby completing the forced homogenization pretreatment at the particle size and significantly increasing their total reaction surface area. The fuel particle stream, thoroughly mixed in this process, is then transported to the downstream encapsulation mechanism 2 for further processing.

[0032] As a further improvement to the present invention, such as Figure 4 and Figure 5 As shown, a first motor 103 is fixedly connected to the bottom end of the dispersing cylinder 102. A turntable 104, which is rotatably connected to the dispersing cylinder 102, is fixedly connected to the end of the main shaft of the first motor 103. A dispersing rod 105 is fixedly connected to the top end of the turntable 104. After the powder enters the dispersing cylinder 102, it is subjected to mechanical impact and circumferential shearing by the high-speed rotating dispersing rod 105 during the process of falling under gravity. The soft agglomerates and bridging structures are effectively destroyed, thereby realizing the primary fluidization and monomerization of the powder. This pretreatment directly eliminates large-scale heterogeneous factors, which is a necessary prerequisite to ensure that the subsequent counter-mixing process can achieve the designed uniformity index.

[0033] As a further improvement to the present invention, such as Figure 2 and Figure 6 As shown, the wrapping mechanism 2 includes an inner tube 201 fixedly connected to the three-way tube 101, a middle tube 202 fixedly connected to the outer side of the inner tube 201, an annular cavity between the inner tube 201 and the middle tube 202, a second feed tube 203 fixedly connected to the top end of the middle tube 202, and the outlet end of the middle tube 202 connected to the feed tube of the kneading mechanism 3. The annular cavity of the encapsulation mechanism 2 is connected to the external molten medium supply system via the second feed pipe 203. Homogenized fuel particles from the counter-mixing mechanism 1, driven by the central carrier gas, enter the flow channel of the central inner pipe 201 at high speed. Simultaneously, the molten medium is pumped into the annular cavity and extruded through a precisely designed annular slot, forming a stable, continuous laminar liquid film adhering to the wall at the cavity end. When the central particle flow and the peripheral liquid film meet at the outlet, they form a coaxial annular gas-liquid-solid three-phase flow. Due to the extremely high axial velocity difference between the two phases, a strong viscous shearing effect is generated. This effect continuously thins, tears, and atomizes the liquid film, ultimately using the viscous force of the liquid to uniformly and completely encapsulate the surface of each high-speed-passing fuel particle, forming a preliminary core-shell structure.

[0034] As a further improvement to the present invention, such as Figure 2 and Figure 6 As shown, a first insulation pipe 204 is fixedly connected to the outer side of the central tube 202, a first temperature sensor 207 is fixedly connected to the inner side of the first insulation pipe 204, a second air inlet pipe 205 is fixedly connected to the top of the first insulation pipe 204, and a first air outlet pipe 206 is fixedly connected to the side of the first insulation pipe 204. To maintain the ideal working temperature and fluidity of the molten medium, a closed-loop temperature control circuit is set up in the system. The second air inlet pipe 205 is connected to the treated low-temperature flue gas pipe at the tail of the boiler 12, introducing flue gas at approximately 150-250℃ into the outer side of the central tube 202, thereby indirectly and continuously heating and insulating the molten medium inside. The first temperature sensor 207, integrated into the flow channel or medium cavity, monitors the medium temperature in real time and transmits the signal to the central control cabinet via a data cable. The operator can preset the optimal working temperature range and alarm threshold in the control system according to the rheological characteristics of the molten medium. When the monitored temperature is lower than the set lower limit, the control system can automatically adjust the opening of the flue gas valve to increase the heating power, ensure that the medium temperature is constant within the required range, prevent it from solidifying or increasing in viscosity due to cooling, and ultimately ensure the continuous stability of the core-shell encapsulation process and the uniformity of the encapsulation quality.

[0035] As a further improvement to the present invention, such as Figure 2 and Figure 7 As shown, the kneading mechanism 3 includes a conical cylinder 309, a third support leg 11 fixedly connected to the bottom end of the conical cylinder 309, a guide cylinder 302 rotatably connected to the inner side of the conical cylinder 309, and a spiral kneading frame 306 fixedly connected to the outer side of the guide cylinder 302. The spiral kneading frame 306 is conical in design. A material passage groove 308 is provided on the inner side of the guide cylinder 302. A feeding groove 307 communicating with the material passage groove 308 is provided at the contact point between the spiral kneading frame 306 and the guide cylinder 302. The radial distance between the inner wall of the spiral kneading frame 306 and the inner wall of the conical cylinder 309 gradually decreases from the feeding end to the discharging end of the conical cylinder 309. The pre-formed but not fully solidified core-shell fuel precursor first falls into the transition cylinder 301 for buffering and pre-distribution, and then enters the inner side of the feed cylinder 302. Under the joint guidance of the feed chute 307 and the feed channel 308, the fuel is evenly fed into the working chamber of the spiral kneading frame 306. As the spiral kneading frame 306 rotates spirally within the inner cavity of the conical cylinder 309, it continuously propels the fuel particles forward. During this process, under the mechanical constraints generated by the gradual contraction of the frame space and the shearing thrust of the spiral blades, the particles undergo intense three-dimensional compression, kneading, and rolling, thus being further densified and sphericalized, ultimately outputting core-shell-coated fuel particles with significantly improved mechanical strength and uniform structure.

[0036] As a further improvement to the present invention, such as Figure 1 , Figure 1 , Figure 1 and Figure 1 As shown, a transition cylinder 301 is fixedly connected to the outlet end of the central tube 202. A second motor 305 is fixedly connected to one end of the transition cylinder 301. A gear 304 is fixedly connected to the end of the main shaft of the second motor 305. A gear ring 303 meshes with one end of the gear 304. The gear ring 303 is fixed to the outside of the guide cylinder 302. A filter screen 310 is embedded on the surface of the transition cylinder 301. The function of the filter screen 310 is to separate and discharge the excess conveying gas accompanying the fuel particles, ensuring that the particles enter the subsequent process in a dense phase state, while maintaining the pressure balance inside the cavity. When the guide cylinder 302 and the spiral kneading frame 306 need to rotate: the second motor 305 is started, and its output shaft drives the gear 304 to rotate; the gear 304 meshes with the gear ring 303 fixed on the outer wall of the guide cylinder 302, thereby transmitting torque to the gear ring 303; the rotation of the gear ring 303 drives the guide cylinder 302 and the spiral kneading frame 306 fixed to it to rotate synchronously, providing the mechanical power required for the kneading process.

[0037] Workflow: When the mixing process of pulverized coal and dry sludge powder is started, the two raw materials are transported to the corresponding dispersing cylinders 102 through symmetrically arranged first feed pipes 108. After entering the dispersing cylinder 102, the powder is subjected to mechanical impact and circumferential shearing by the high-speed rotating dispersing rod 105 during gravity descent. The soft agglomerates and bridging structures are effectively destroyed, thereby achieving primary fluidization and monomerization of the powder. This pretreatment directly eliminates large-scale heterogeneity factors, which is a necessary prerequisite to ensure that the subsequent counter-mixing process can achieve the designed uniformity index. Subsequently, high-pressure carrier gas from the first air inlet pipe 106 carries the two dispersed powder streams and collides them at high speed and forward at the confluence center of the three-way pipe 101. This action utilizes the extreme turbulence and shear force field generated by the collision to force the two particles with different physical properties to undergo violent impact, friction, and interlocking at the microscale, thereby completing the forced homogenization pretreatment at the particle scale and significantly increasing its total reaction surface area. The fuel particle stream, which has been thoroughly mixed in this process, is then transported to the downstream packaging mechanism 2 for the next step. The annular cavity between the inner tube 201 and the middle tube 202 is connected to the external molten medium supply system via the second feed pipe 203. Homogenized fuel particles from the counter-mixing mechanism 1, driven by the central carrier gas, enter the flow channel of the central inner tube 201 at high speed. Simultaneously, the molten medium is pumped into the annular cavity and extruded through a precisely designed annular slot, forming a stable, continuous laminar liquid film adhering to the wall at the cavity end. When the central particle flow and the peripheral liquid film meet at the outlet, they form a coaxial annular gas-liquid-solid three-phase flow. Due to the extremely high axial velocity difference between the two phases, a strong viscous shearing effect is generated. This effect continuously thins, tears, and atomizes the liquid film, ultimately using the viscous force of the liquid to uniformly and completely coat the surface of each high-speed-passing fuel particle, forming a preliminary core-shell structure. The pre-formed but not fully solidified core-shell fuel precursor first falls into the transition cylinder 301 for buffering and pre-distribution, and then enters the inner side of the feed cylinder 302. Under the joint guidance of the feed chute 307 and the feed channel 308, the fuel is evenly fed into the working chamber of the spiral kneading frame 306. As the spiral kneading frame 306 rotates spirally within the inner cavity of the conical cylinder 309, it continuously propels the fuel particles forward. During this process, under the mechanical constraints generated by the gradual contraction of the frame space and the shearing thrust of the spiral blades, the particles undergo intense three-dimensional compression, kneading, and rolling, thus being further densified and sphericalized, ultimately outputting core-shell-coated fuel particles with significantly improved mechanical strength and uniform structure.

[0038] The above are preferred embodiments of the present invention. The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are only illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from the scope of protection of the present invention. All such changes and modifications fall within the scope of protection of the present invention as defined by the appended claims and their equivalents.

Claims

1. A boiler with a multi-fuel intelligent blending device, comprising a boiler (12) and a screw conveyor (5), characterized in that: The feed end of the boiler (12) is connected to a screw conveyor (5), the feed end of the screw conveyor (5) is connected to a discharge shell (9), the feed end of the discharge shell (9) is connected to a kneading mechanism (3), the feed end of the kneading mechanism (3) is connected to a wrapping mechanism (2), and the feed end of the wrapping mechanism (2) is connected to a counter-mixing mechanism (1). The counter-mixing mechanism (1) is used to mix pulverized coal and dry sludge powder together to form mixed fuel particles; The wrapping mechanism (2) is used to include a layer of molten medium on the outside of the mixed fuel; The kneading mechanism (3) is used to knead and compress the mixed fuel containing the molten medium into dense, homogeneous particles to form a core-shell encapsulated fuel.

2. A boiler with a multi-fuel intelligent blending device according to claim 1, characterized in that: The screw conveyor (5) is fixedly connected to a second heat-insulating pipe (6) on the outside, a second air inlet pipe (4) is fixedly connected to the top of the second heat-insulating pipe (6), a second air outlet pipe (7) is fixedly connected to the side of the second heat-insulating pipe (6), a second temperature sensor (13) is fixedly connected to the inside of the second heat-insulating pipe (6), and a first support leg (8) is fixedly connected to the bottom of the second heat-insulating pipe (6).

3. A boiler with a multi-fuel intelligent blending device according to claim 1, characterized in that: The counter-mixing mechanism (1) includes a three-way pipe (101), both ends of which are fixedly connected to a dispersing cylinder (102). The top of the dispersing cylinder (102) is fixedly connected to a cylinder cover (107), the top of the cylinder cover (107) is fixedly connected to a first air inlet pipe (106), the side of the dispersing cylinder (102) is fixedly connected to a first feed pipe (108), the bottom of the three-way pipe (101) is fixedly connected to a second support leg (10), the first air inlet pipe (106) is connected to an external air source, the two first feed pipes (108) are respectively connected to a coal powder conveying pipe and a dry sludge conveying pipe, and the other discharge end of the three-way pipe (101) is connected to the feed end of the wrapping mechanism (2).

4. A boiler with a multi-fuel intelligent blending device according to claim 3, characterized in that: The bottom end of the dispersing cylinder (102) is fixedly connected to a first motor (103), the end of the main shaft of the first motor (103) is fixedly connected to a turntable (104) that is rotatably connected to the dispersing cylinder (102), and the top end of the turntable (104) is fixedly connected to a dispersing rod (105).

5. A boiler with a multi-fuel intelligent blending device according to claim 3, characterized in that: The wrapping mechanism (2) includes an inner tube (201) fixedly connected to a three-way tube (101), a middle tube (202) fixedly connected to the outside of the inner tube (201), an annular cavity between the inner tube (201) and the middle tube (202), a second feed tube (203) fixedly connected to the top of the middle tube (202), and the outlet end of the middle tube (202) connected to the feed tube of the kneading mechanism (3).

6. A boiler with a multi-fuel intelligent blending device according to claim 5, characterized in that: The outer side of the central tube (202) is fixedly connected to a first heat-insulating tube (204), the inner side of the first heat-insulating tube (204) is fixedly connected to a first temperature sensor (207), the top end of the first heat-insulating tube (204) is fixedly connected to a second air inlet tube (205), and the side of the first heat-insulating tube (204) is fixedly connected to a first air outlet tube (206).

7. A boiler with a multi-fuel intelligent blending device according to claim 5, characterized in that: The kneading mechanism (3) includes a conical cylinder (309), a third support leg (11) is fixedly connected to the bottom end of the conical cylinder (309), a guide cylinder (302) is rotatably connected to the inner side of the conical cylinder (309), a spiral kneading frame (306) is fixedly connected to the outer side of the guide cylinder (302), a material passage groove (308) is opened on the inner side of the guide cylinder (302), and a feeding groove (307) communicating with the material passage groove (308) is opened at the contact point between the spiral kneading frame (306) and the guide cylinder (302).

8. A boiler with a multi-fuel intelligent blending device according to claim 5, characterized in that: The outlet end of the central tube (202) is fixedly connected to a transition cylinder (301), one end of the transition cylinder (301) is fixedly connected to a second motor (305), the end of the main shaft of the second motor (305) is fixedly connected to a gear (304), one end of the gear (304) is meshed with a gear ring (303), the gear ring (303) is fixed on the outside of the guide cylinder (302), and a filter screen (310) is embedded on the surface of the transition cylinder (301).

9. A boiler with a multi-fuel intelligent blending device according to claim 7, characterized in that: The radial distance between the inner wall of the spiral kneading frame (306) and the inner wall of the conical cylinder (309) gradually decreases from the feed end to the discharge end of the conical cylinder (309).

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