Biomass briquetting device, biomass briquetting method and biomass power generation method

Abstract

The application discloses a kind of based on biomass brittle quality upgrading of pulverous biofuel preparation device, preparation method and biomass power generation method, belong to the technical field of biomass energy.It is based on biomass brittle quality upgrading of pulverous biofuel preparation device including bunker, screw conveying bin, brittle bin, two middle bins and coal mill;First conveying screw is arranged in screw conveying bin, and the conveying direction is from the end close to bunker to the end away from bunker, and the top inlet of screw conveying bin is equipped with visual image device;Second conveying screw is built-in brittle bin, and the conveying direction is opposite to the conveying direction of first conveying screw, and heating channel is arranged in brittle bin, and two middle bins are communicated with screw conveying bin and brittle bin respectively;Coal mill is used to make brittle biomass into biomass powder.The application realizes the preparation of pulverous biofuel based on biomass brittle quality upgrading, can improve the quality consistency of herbaceous biomass brittle, meet the process requirements such as subsequent blending and pulverizing.

Description

Technical Field

[0001] This invention belongs to the field of biomass energy technology, and specifically relates to a powdered biofuel preparation device, preparation method, and biomass power generation method based on biomass embrittlement and upgrading. Background Technology

[0002] As an important component of the renewable energy system, biomass energy uses biomass materials as raw materials and converts them into heat and electricity through various pathways such as direct combustion, gasification, and pyrolysis. It boasts advantages such as wide availability, renewability, and zero carbon emissions. Biomass's widespread availability and zero-carbon nature make its application in existing coal-fired power plants—the so-called coal-fired power coupled with biomass power generation—an important pathway for the low-carbon transformation of coal-fired power.

[0003] From the perspective of biomass utilization, biomass can be classified into herbaceous biomass (such as straw, reeds, and weeds) and woody biomass (such as branches, trunks, and wood processing waste). The principle of coal mills in power plants relies on the brittle fracture of coal particles, which is unsuitable for fibrous biomass materials, as it is difficult to crush them to the required particle size of less than 2 mm for blending. Therefore, pre-treating biomass to improve its grindability is crucial for achieving low-energy pulverization and blending.

[0004] Currently, in the biomass fuel production process, to improve grindability, powdered biofuel preparation devices based on biomass embrittlement and upgrading are used to perform embrittlement pretreatment on herbaceous biomass, straw, etc. Because biomass may break or partially detach during natural drying and transportation, resulting in a very wide particle size distribution and a large amount of biomass debris, the process is problematic.

[0005] Existing biomass embrittlement and upgrading equipment directly conveys a mixture of raw materials containing biomass debris to an embrittlement chamber for heating and embrittlement via a conveying screw. However, because biomass stems and leaves are not distinguished from biomass debris during feeding, the mixture is directly conveyed to the embrittlement chamber in the same direction as the feed. All the mixed materials undergo the same conveying path and heating time, resulting in insufficient embrittlement of biomass stems and leaves due to insufficient heating time, and excessive embrittlement or even pyrolysis of debris due to excessive heating time. The direct result is that the embrittled herbaceous biomass mixture often exhibits insufficient embrittlement of herbaceous biomass stems and leaves, while biomass debris is excessively embrittled. This makes it difficult to meet the quality consistency requirements of subsequent processes such as co-firing and grinding of herbaceous biomass, thus restricting the application effect of herbaceous biomass in biomass co-firing. At the same time, during the thermal embrittlement pretreatment of biomass of different sizes, problems such as small debris being fully embrittled while large stems and leaves are only shallowly embrittled, or large stems and leaves being fully embrittled while small debris is excessively embrittled and prone to pyrolysis and combustion, can occur. Summary of the Invention

[0006] In view of the above analysis, the present invention aims to provide a powdered biofuel preparation device, preparation method and biomass power generation method based on biomass embrittlement and upgrading, so as to solve at least one of the above-mentioned problems existing in the prior art.

[0007] The objective of this invention is achieved as follows:

[0008] A device for preparing powdered biofuel based on biomass embrittlement and upgrading includes:

[0009] The silo has two separate storage spaces for storing herbaceous biomass stems and leaves and biomass debris, respectively.

[0010] A screw conveyor bin is located below the silo. A first conveying screw is installed inside the screw conveyor bin. The conveying direction is from one end closer to the silo to the other end farther away from the silo. The top of the screw conveyor bin is provided with a feed inlet. The feed inlet is provided with a visual image device for identifying the type of herbaceous biomass material, which includes biomass stems and leaves and biomass debris.

[0011] The brittleness chamber has a built-in second conveying screw, which conveys in the opposite direction to the first conveying screw. The brittleness chamber is equipped with a heating channel, which is connected to a conveying pipe outside the brittleness chamber. The bottom of the brittleness chamber is equipped with a discharge port and multiple pulsed airflow channels to prevent fine particles and debris from accumulating at the bottom and causing overheating and combustion risks.

[0012] Two intermediate compartments are located at both ends of the screw conveyor compartment. The intermediate compartments are connected and communicate with the screw conveyor compartment and the embrittlement compartment, respectively. Each intermediate compartment is equipped with an electric valve.

[0013] Furthermore, it also includes coal mills for turning brittle biomass into biomass powder.

[0014] Furthermore, a vertical partition is provided inside the silo, which divides the silo into a stem and leaf silo and a debris silo. Both the stem and leaf silo and the debris silo have a discharge port at the bottom, and the two discharge ports are close to each other.

[0015] Furthermore, it also includes a herbaceous biomass pre-separation mechanism for converting and separating stored biomass stacks into biomass stems and leaves and biomass debris. The biomass pre-separation mechanism includes a cutting mechanism and a separation mechanism. The cutting mechanism is used to cut the biomass stack into multiple herbaceous biomass blocks, and the separation mechanism is used to receive the biomass blocks and separate the biomass blocks into biomass stems and leaves and biomass debris.

[0016] Furthermore, the slitting mechanism includes:

[0017] A slitting bin for holding biomass stacks, wherein one end of the slitting bin has an outlet;

[0018] A three-axis slide rail module is positioned above the cutting chamber;

[0019] The cutting blade has a cross-section in the shape of a grid and is connected to the three-axis slide rail module; the slitting mechanism is set in the slitting chamber and slits the biomass stack along the height direction of the biomass stack.

[0020] A conveyor belt assembly is disposed in the bottom groove of the slitting chamber. The conveyor belt of the conveyor belt assembly is flush with the bottom surface of the slitting chamber. One end of the conveyor belt assembly is disposed at the outlet, and the outlet is connected to an inclined downward hopper.

[0021] A pushing mechanism, located at the bottom of the cutting chamber, is used to push the cut herbaceous biomass blocks in the cutting chamber toward the conveyor belt assembly.

[0022] Furthermore, the pushing mechanism includes a pushing slide rail module and a push rod. The push rod is disposed inside the slitting compartment, and the pushing slide rail module is disposed outside the slitting compartment. The pushing slide rail module and the push rod are connected by a connecting rod. The pushing slide rail module can drive the push rod to move toward the conveyor belt assembly. The pushing slide rail module and the push rod include two sets, which are respectively disposed on opposite sides of the conveyor belt assembly.

[0023] Furthermore, the separation mechanism includes:

[0024] The separation chamber has a main entrance at its top, and an electric gate at the main entrance is used to control the opening and closing of the main entrance;

[0025] A striking mechanism, connected to the separation chamber, is used to drive the separation chamber to reciprocate so that the herbaceous biomass blocks inside the separation chamber will impact each other.

[0026] A tearing mechanism, located above the separation chamber, is used to tear and separate the impacted herbaceous biomass within the separation chamber.

[0027] A hot air blowing mechanism is provided at the first end of the separation chamber near the main inlet, for blowing hot air into the separation chamber. The airflow flows from the first end of the separation chamber to the opposite second end of the separation chamber, so that the herbaceous biomass moves to the second end of the separation chamber. The second end of the separation chamber is provided with a main outlet.

[0028] Furthermore, the hot air blowing mechanism includes an inlet metal hose and an outlet metal hose. The inlet metal hose is connected to the first end of the separation chamber, and the outlet metal hose is connected to the main outlet at the second end of the separation chamber. The outlet metal hose has a Y-shaped structure. One branch of the outlet metal hose is connected to the hopper for conveying biomass debris, and the other branch is connected to the hopper for conveying biomass stems and leaves. A valve is provided inside the outlet metal hose to control the opening and closing of the two branch pipes. An air outlet is also provided at the top of the hopper, and a screen is provided inside the air outlet. The air outlet, the inlet metal hose, and the outlet metal hose cooperate to form a gas passage.

[0029] Furthermore, the striking mechanism includes a striking slide rail module, which is disposed on opposite sides of the separation chamber; the tearing mechanism includes a lifting seat, a bottom rail, a pin array assembly, a pin array slide rail module, and a clamping mechanism. The lifting seat is disposed at the bottom of the separation chamber, the bottom rail is driven to the lifting seat, and the bottom rail is slidably connected to the separation chamber. The pin array assembly is driven to the pin array slide rail module. The clamping mechanism is disposed on the pin array slide rail module and is used to control the connection and release of the pin array assembly and the pin array slide rail module. The pin array assemblies are respectively disposed at opposite ends of the separation chamber. Insertion holes are provided at opposite ends of the separation chamber. A retaining hole is also provided on one side of the insertion hole at the second end of the separation chamber for inserting the pin array assembly into the separation chamber. A moving hole is also provided at the top of the second end of the separation chamber.

[0030] When the biomass block is tapped, the pin assembly is inserted into the insertion holes at both ends of the separation chamber, so that the pin assembly is inserted into both ends of the separation chamber and abuts against the inner bottom surface of the separation chamber;

[0031] After the biomass block is tapped, the hot air blowing mechanism blows air into the second end of the separation chamber, causing the biomass to move to the second end. Herbaceous biomass is located on one side of the needle assembly at the second end and below the moving hole.

[0032] The needle assembly at the first end of the separation chamber moves into the holding hole and presses down the biomass. The needle assembly at the second end moves into the moving hole, inserts downward into the herbaceous biomass, and moves towards the first end of the separation chamber to tear the biomass.

[0033] Furthermore, the pin header assembly includes multiple pin headers, which are spaced apart along the width direction of the separation chamber. Each pin header is connected to a mounting frame and includes multiple pins arranged along the length direction of the separation chamber. The pin headers at the first end of the separation chamber are staggered from the pin headers at the second end of the separation chamber.

[0034] According to a second aspect of the present invention, a method for preparing powdered biofuel based on biomass embrittlement and upgrading is also provided. The method uses the above-mentioned powdered biofuel preparation device based on biomass embrittlement and upgrading, firstly embrittles herbaceous biomass to obtain embrittled biomass, and then uses a coal mill to process the embrittled biomass into biomass powder.

[0035] According to a third aspect of the present invention, a biomass power generation method is also provided, wherein biomass powder obtained by the above-described powdered biofuel preparation method is mixed with coal powder and then burned to generate electricity.

[0036] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0037] 1. The powdered biofuel preparation device based on biomass embrittlement and upgrading disclosed in this application features two independent storage spaces in the hopper for storing biomass stems and leaves and biomass debris, respectively, thus avoiding the mixing of the two forms of biomass. Furthermore, a visual imaging device at the feed inlet identifies the type of biomass material. The second conveying screw in the embrittlement hopper transports biomass in the opposite direction to the first conveying screw, allowing the biomass stems and leaves to receive sufficient heating time via a longer conveying path, while the biomass debris receives less heating time via a shorter conveying path, preventing over-embrittlement and achieving uniform biomass embrittlement. Simultaneously, it avoids the problem of small debris becoming fully embrittled while large stems and leaves only undergo shallow embrittlement, or large stems and leaves becoming fully embrittled while small debris becomes over-embrittled, leading to pyrolysis and combustion, during the thermal embrittlement pretreatment of biomass of different sizes.

[0038] 2. The powdered biofuel preparation device based on biomass embrittlement and upgrading in this application has multiple pulsed airflow channels at the bottom of the embrittlement chamber, which can form pulsed airflow impact, effectively preventing fine particles of debris from depositing at the bottom of the embrittlement chamber and causing the risk of overheating and combustion.

[0039] 3. The method for preparing powdered biofuel based on biomass embrittlement and upgrading provided by the present invention not only embrittles biomass to improve its grindability, making it easier to inject into power plant boilers for combustion after pulverization, forming biomass fuel that can be coupled with coal for power generation, but also ensures the consistency of the quality of the embrittled herbaceous biomass, meeting the requirements of subsequent co-firing and pulverization processes, and improving the application effect of herbaceous biomass in biomass co-firing.

[0040] 4. The biomass power generation method provided by the present invention mixes embrittled biomass powder with coal at a ratio of 10-20%, pulverizes it quickly through a coal mill, and then blows it into the boiler burner with hot air in the same batch. The mixture is then burned in the boiler to generate electricity, forming a coal-biomass coupled power generation, which reduces carbon emissions.

[0041] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings.

[0043] Figure 1 A schematic diagram of the overall structure of a powdered biofuel preparation device based on biomass embrittlement and upgrading provided by the present invention;

[0044] Figure 2 A partial structural schematic diagram of a powdered biofuel preparation device based on biomass embrittlement and upgrading provided by the present invention;

[0045] Figure 3 A cross-sectional structural schematic diagram of a powdered biofuel preparation device based on biomass embrittlement and upgrading provided by the present invention;

[0046] Figure 4 Morphological diagram of the herbaceous biomass after dispersion provided by the present invention;

[0047] Figure 5 A schematic diagram of a slitting mechanism provided by the invention;

[0048] Figure 6 A schematic diagram of a separation mechanism provided by the invention;

[0049] Figure 7 for Figure 6 A magnified schematic diagram of a portion of region A in the middle;

[0050] Figure 8 for Figure 6 A magnified schematic diagram of a portion of region B.

[0051] Figure label:

[0052] 10-Feed bin; 11-Herbal biomass; 12-Screw conveyor bin; 13-First conveying screw; 14-Feed inlet; 15-Embrittleness bin; 16-Second conveying screw; 17-Discharge outlet; 18-Intermediate bin; 19-Heating channel;

[0053] 20-Slitting mechanism; 21-Slitting chamber; 22-Outlet; 23-Three-axis slide rail module; 24-Conveyor belt assembly; 25-Push slide rail module; 26-Push rod; 27-Cut blade;

[0054] 30 - Separation mechanism; 31 - Separation chamber; 32 - Inlet metal hose; 33 - Outlet metal hose; 34 - Main inlet;

[0055] 40-Slapping slide rail module; 41-Lifting seat; 42-Bottom rail; 43-Pin header assembly; 432-Pin; 433-Mounting frame; 44-Pin header slide rail module; 45-Clamping mechanism; 46-Insert hole; 47-Holding hole; 48-Moving hole;

[0056] 50-Hopper; 51-Valve motor; 52-Sealing plate; 53-Herbaceous biomass stack; 54-First end; 55-Second end. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0058] To facilitate understanding of the embodiments of this application, further explanation and description will be provided below with reference to the accompanying drawings and specific embodiments. These embodiments do not constitute a limitation on the embodiments of this application. In the drawings, the dimensions and relative dimensions of components may be exaggerated for clarity and / or descriptive purposes. When exemplary embodiments can be implemented differently, a specific process sequence may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in the reverse order of their description. Furthermore, the same reference numerals denote the same components.

[0059] The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, unless the context clearly indicates otherwise, the singular forms “a” and “the” are intended to include the plural forms as well. Furthermore, when the terms “comprising” and / or “including” and variations thereof are used in this specification, it indicates the presence of the stated features, integrals, steps, operations, parts, components, and / or groups thereof, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, parts, components, and / or groups thereof. It should also be noted that, as used herein, the terms “substantially,” “about,” and other similar terms are used as approximate terms rather than as terms of degree, thus explaining the inherent biases in measurements, calculated values, and / or provided values ​​that would be recognized by one of ordinary skill in the art.

[0060] Example 1

[0061] Herbaceous biomass is a typical biomass raw material. Figure 8 A morphological diagram of herbaceous biomass 11 has been disclosed. To meet the requirements for grindability, calorific value, and other indicators of herbaceous biomass, it is necessary to perform a brittleness treatment. This involves heating the herbaceous biomass to break down its fibers and remove some moisture, thereby improving its combustion performance. The structural characteristics of herbaceous biomass stems and leaves differ significantly from those of biomass debris. Herbaceous biomass stems and leaves have coarse fibers and high density, while biomass debris has fine particles and a large specific surface area. During brittleness treatment, if both are transported along the same path, the biomass debris is prone to overheating and becoming overly brittle, potentially breaking into excessively fine powder, which can easily lead to agglomeration or loss during subsequent transport.

[0062] Based on this, such as Figures 1 to 7 As shown, this invention discloses a powdered biofuel preparation device based on biomass embrittlement and upgrading, which includes:

[0063] The feed bin 10 has separate storage spaces for storing herbaceous biomass stems and leaves and biomass debris, with the two independent storage spaces storing herbaceous biomass stems and leaves and biomass debris respectively.

[0064] The screw conveyor 12 is located below the hopper 10. The screw conveyor 12 is equipped with a first conveying screw 13. The conveying direction is from the end closer to the hopper 10 to the end farther away from the hopper 10. The top of the screw conveyor 12 is equipped with a feed inlet 14. The feed inlet 14 is equipped with a visual image device for identifying the type of herbaceous biomass. The type of herbaceous biomass includes two types: herbaceous biomass stems and leaves and biomass debris. Herbaceous biomass stems and leaves can be referred to as "biomass stems and leaves" below.

[0065] The brittleness chamber 15 has a built-in second conveying screw 16, whose conveying direction is opposite to that of the first conveying screw 13. The brittleness chamber 15 is equipped with a heating channel 19, which is connected to the conveying pipe outside the brittleness chamber 15. The bottom of the brittleness chamber 15 is equipped with a discharge port 17. The bottom of the brittleness chamber 15 is equipped with multiple pulse airflow channels to prevent fine particles and debris from accumulating at the bottom and causing overheating and combustion risks.

[0066] Two intermediate compartments 18 are located at both ends of the screw conveyor compartment 12. The intermediate compartments 18 are connected to and communicate with the screw conveyor compartment 12 and the embrittlement compartment 15, respectively. The intermediate compartments 18 are equipped with electric valves.

[0067] Furthermore, the biomass embrittlement and upgrading device for preparing powdered biofuel also includes a coal mill, which is used to process the embrittled biomass into biomass powder. The biomass powder can be used directly as a single-component powdered biofuel, or it can be mixed with coal powder in a certain proportion to form a mixed powdered biofuel. The coal mill can be independent of other parts, collecting and storing the embrittled biomass from the discharge port 17 at the bottom of the embrittlement chamber 15 for use when needed; alternatively, the inlet of the coal mill can be connected to the discharge port 17 at the bottom of the embrittlement chamber 15. After embrittlement is complete, the biomass can directly enter the coal mill for pulverization through a transfer channel. The transfer channel can dissipate heat from the freshly embrittled biomass, ensuring it is cooled before entering the coal mill.

[0068] It should be noted that the screw conveyor 12, intermediate section 18, embrittlement 15, heating channel 19, and coal mill in this embodiment are all existing equipment.

[0069] In this embodiment, a visual imaging device is installed inside the feed inlet 14 to identify whether the herbaceous biomass is biomass stems and leaves or biomass debris. Simultaneously, this application includes two intermediate compartments 18, with the first conveying screw 13 and the second conveying screw 16 operating in different directions. In other words, these features alter the original embrittlement path of the herbaceous biomass, creating two different embrittlement paths based on the existing equipment. The visual imaging device and electric valves also utilize existing equipment. The visual imaging device identifies the type of herbaceous biomass and, upon identification, controls the opening and closing of the electric valves in the intermediate compartments 18. Furthermore, the discharge outlet 17 is positioned close to the feed inlet 14, allowing biomass debris entering from the feed inlet 14 to be quickly discharged from the discharge outlet 17. This application uses silos 10 to store biomass stems and leaves separately from biomass debris, avoiding the mixing of the two forms of herbaceous biomass. A visual imaging device at the feed inlet 14 identifies the type of herbaceous biomass. The second conveying screw 16 of the embrittlement chamber 15 transports the biomass in the opposite direction to the first conveying screw 13, allowing the biomass stems and leaves to receive sufficient heating time via a longer conveying path, while the biomass debris receives less heating time via a shorter conveying path, preventing over-embrittlement and achieving uniform embrittlement of the herbaceous biomass. Simultaneously, multiple pulsed airflow channels are designed to create pulsed airflow impacts, effectively preventing fine debris from depositing at the bottom of the embrittlement chamber 15 and causing overheating and combustion risks. The pulsed airflow channels are existing technology, relying on a high-pressure air source for power. The airflow is distributed through pipelines to multiple channel openings at the bottom of the embrittlement chamber. An intermittent injection mode is used, with airflow controlled by solenoid valves to create pulsed airflow impacts. The airflow is ejected vertically or obliquely from the channel openings, directly acting on the fine debris at the bottom of the embrittlement chamber, generating instantaneous impact force.

[0070] In this embodiment, the two independent storage spaces of the silo 10 store biomass stems and leaves and biomass debris respectively, avoiding mixing of the two forms of herbaceous biomass before pretreatment. The silo 10 feeds the material to the screw conveyor 12 below. The feed inlet 14 at the top of the screw conveyor 12 identifies the type of herbaceous biomass entering the silo through a visual imaging device. If it is biomass stems and leaves, the middle section 18 near the feed inlet 14 is closed, and the middle section 18 away from the feed inlet 14 is opened. The first conveying screw 13 conveys the herbaceous biomass, transporting the biomass stems and leaves to the middle section 18 away from the feed inlet 14. If it is biomass debris, the middle section 18 near the feed inlet 14 is opened, and the middle section 18 away from the feed inlet 14 is closed. The first conveying screw 13 conveys the herbaceous biomass, transporting the biomass stems and leaves to the middle section 18 near the feed inlet 14. The second conveying screw 16 inside the embrittlement chamber 15 conveys in the opposite direction to the first conveying screw 13. Simultaneously, the embrittlement chamber 15, connected to an external conveying pipe and a heating channel 19, achieves heating. For biomass stems and leaves requiring thorough embrittlement, the reverse conveying creates a longer conveying path and heating time within the embrittlement chamber 15, ensuring sufficient fiber breakage. For biomass debris prone to over-embrittlement, the reverse conveying path is relatively shorter, reducing the heating time. The heating channel 19 continuously provides a stable heat source, ensuring uniform temperature during embrittlement and guaranteeing fiber breakage and moisture removal from the herbaceous biomass. The differentiated embrittlement-treated herbaceous biomass is discharged through the outlet 17 at the bottom of the embrittlement chamber 15 and enters the subsequent blending and grinding stage.

[0071] In this embodiment, heat transfer oil is transported in the conveying pipeline and flows into the heating channel 19 to heat the embrittlement chamber 15. Utilizing the existing low-temperature flue gas of the power plant, the biomass undergoes a multi-stage, low-temperature embrittlement pretreatment under slight negative pressure. This improves the mechanical grindability of the biomass and removes water, volatile matter, and potassium chloride, bringing its physicochemical properties to the levels of long-flame coal. Specifically:

[0072] Low-temperature flue gas (300°C) is extracted before the air preheater. The 300°C hot flue gas at the front end of the air preheater is discharged through the exhaust pipe and the shell and tube heat exchanger to produce 280°C high-temperature heat transfer oil, which then flows into the delivery pipe.

[0073] In this embodiment, a partition is vertically arranged inside the hopper 10, which divides the hopper 10 into a stem and leaf hopper and a debris hopper. Both the stem and leaf hopper and the debris hopper have a discharge port at the bottom, and the two discharge ports are close to each other.

[0074] An electric valve is installed inside the discharge port to control its opening and closing. In this application, "electric valve" is a general term for various types of valves. In specific applications, the appropriate type of valve is selected based on the type of outlet that needs to be closed. During use, biomass stems and leaves and biomass debris can be released alternately through the discharge port. Alternatively, the biomass stems and leaves in the stem and leaf chamber can be released first, followed by the biomass debris in the debris chamber. Due to the different settings of the embrittlement heating path, the powdered biofuel preparation device based on biomass embrittlement and upgrading can achieve the effect of embrittlement of two different types of herbaceous biomass—biomass stems and leaves and biomass debris—without changing the heating time and temperature, all within the same embrittlement chamber 15.

[0075] In some embodiments, the apparatus further includes a herbaceous biomass pre-separation mechanism for converting and separating stored herbaceous biomass stacks into biomass stems and leaves and biomass debris. After being collected from the field, the herbaceous biomass is first processed and pre-crushed. After processing, the herbaceous biomass is compressed and transported to the plant for storage. At this stage, the herbaceous biomass stacks are typically larger than 0.5 m in diameter. Herbaceous biomass stacks are convenient for transportation and storage. Therefore, before the herbaceous biomass stacks are brittle, they need to be separated and broken up.

[0076] The herbaceous biomass pre-separation mechanism includes a cutting mechanism 20 and a separation mechanism 30. The cutting mechanism 20 is used to cut the herbaceous biomass stack into multiple herbaceous biomass blocks, and the separation mechanism 30 is used to receive the herbaceous biomass blocks and separate the herbaceous biomass blocks into biomass stems and leaves and biomass debris.

[0077] In this embodiment, the slitting mechanism 20 includes: a slitting chamber 21 for holding herbaceous biomass stacks 53, one end of which has an outlet 22; a three-axis slide rail module 23 disposed above the slitting chamber 21; a cutting blade 27 with a cross-section in the shape of a grid, connected to the three-axis slide rail module 23; a slicing blade mechanism disposed inside the slitting chamber 21, which slices the herbaceous biomass stack along its height direction; a conveyor belt assembly 24 disposed in a bottom groove of the slitting chamber 21, the conveyor belt of the conveyor belt assembly 24 being flush with the bottom surface of the slitting chamber 21, one end of the conveyor belt assembly 24 being connected to the outlet 22, and an inclined downward hopper 50 connected to the outlet 22; and a pushing mechanism disposed at the bottom of the slitting chamber 21, used to push the cut herbaceous biomass blocks inside the slitting chamber 21 toward the conveyor belt assembly 24.

[0078] Herbaceous biomass stacks can be hoisted into the slitting chamber 21 using a hoisting device. The top of the slitting chamber 21 is open. In this embodiment, the herbaceous biomass stacks are rectangular blocks. After the herbaceous biomass stacks are placed in the slitting chamber 21, the cutting blade 27 is moved by the three-axis slide rail module 23. During cutting, cutting can start from the corners of the herbaceous biomass stack and continue cutting along the length and width of the herbaceous biomass stack. The slitting blade mechanism continuously cuts along the height of the herbaceous biomass stack. After cutting, the herbaceous biomass stack is cut into multiple uniform herbaceous biomass blocks. Then, the conveyor belt assembly 24 is activated, which can transport some of the herbaceous biomass blocks to the outlet 22 of the slitting chamber 21 and enter the separation chamber 31 through the hopper 50. The pushing mechanism can push the herbaceous biomass blocks dispersed on both sides of the conveyor belt assembly 24 onto the conveyor belt assembly 24. There is a baffle above the outlet 22 to limit the amount of herbaceous biomass blocks passing through the outlet 22.

[0079] The three-axis slide rail module 23 and the slicing blade mechanism adopt existing structures. The three-axis slide rail module 23 can move in three mutually perpendicular directions: vertical, longitudinal, and transverse, thereby driving the cutting blade 27 to move. The slicing blade mechanism adopts a structure in which a linear motor and the blade are directly connected. The linear motor body is connected to the lifting motor, which enables the blade to be driven to slice the herbaceous biomass stack along the height direction of the stack. The slicing blade mechanism is located on the side of the herbaceous biomass stack.

[0080] The cutting blade 27 is composed of multiple blades welded together to form a grid-like structure. The cutting blade 27 can cut the herbaceous biomass stack into multiple strips, which are then further cut by the slitting mechanism to form multiple herbaceous biomass blocks. The side of the herbaceous biomass stack opposite the slitting mechanism is attached to the inner wall of the separation chamber 31, thus fixing the herbaceous biomass stack and facilitating slitting. The conveyor belt assembly 24 adopts an existing structure. The conveyor belt of the conveyor belt assembly 24 is flush with the bottom surface of the slitting chamber 21, and one end of the conveyor belt assembly 24 is set to the outlet 22, enabling the conveyor belt to continuously transport herbaceous biomass blocks.

[0081] When cutting large herbaceous biomass stacks, multiple cutting blades 27 can be connected together to form a grid structure, improving cutting efficiency. The top of the cutting blade 27 is driven and connected to the three-axis slide rail module 23, which can be done by welding.

[0082] The pushing mechanism includes a pushing slide rail module 25 and push rods 26. Push rods 26 are located inside the slitting chamber 21, while the pushing slide rail module 25 is located outside the slitting chamber 21. The pushing slide rail module 25 and push rods 26 are connected by a connecting rod. The pushing slide rail module 25 can drive the push rods 26 to move towards the conveyor belt assembly 24. There are two sets of pushing slide rail modules 25 and push rods 26, respectively located on opposite sides of the conveyor belt assembly 24. The pushing slide rail module 25 can use an existing structure. The pushing slide rail module 25 can drive the push rods 26 to move at the bottom of the slitting chamber 21. The two push rods 26 move towards the conveyor belt assembly 24, thus moving the herbaceous biomass blocks onto the conveyor belt assembly 24.

[0083] In some embodiments, the separation mechanism 30 includes:

[0084] The separation chamber 31 has a main entrance 34 at its top, and an electric gate is provided at the main entrance 34 to control the opening and closing of the main entrance 34.

[0085] A striking mechanism, connected to the separation chamber 31, is used to drive the separation chamber 31 to reciprocate so that the herbaceous biomass blocks inside the separation chamber 31 will collide.

[0086] A tearing mechanism is installed above the separation chamber 31 to tear and separate the impacted herbaceous biomass inside the separation chamber 31.

[0087] A hot air blowing mechanism is installed at the first end 54 of the separation chamber 31 near the main inlet 34. It is used to blow hot air into the separation chamber 31. The airflow flows from the first end 54 of the separation chamber 31 to the opposite second end 55 of the separation chamber 31, so that the herbaceous biomass moves to the second end 55 of the separation chamber 31. The second end 55 of the separation chamber 31 is provided with a main outlet.

[0088] In this embodiment, the main inlet 34 of the separation chamber 31 is located near the first end 54 of the separation chamber 31, at a predetermined distance from the first end 54. Herbaceous biomass blocks enter the separation chamber 31 through the main inlet 34. After entering the separation chamber 31, an electric valve is activated to close the main inlet 34. In this embodiment, the electric valve structure can be a valve motor 51 driving a closing plate 52 to move, thereby opening and closing the main inlet 34. Then, a striking mechanism is activated to drive the separation chamber 31 to reciprocate, causing the herbaceous biomass blocks inside the separation chamber 31 to collide. After the collision, the herbaceous biomass blocks become loose, with some scattered stems, leaves, and debris. Next, the hot air blowing mechanism is activated. Since the hot air blowing mechanism is located at the first end 54 of the separation chamber 31 near the main inlet 34, it blows hot air into the separation chamber 31. The airflow moves from the first end 54 to the opposite second end 55 of the separation chamber 31, causing the herbaceous biomass to move to the second end 55. At this time, the main outlet needs to be opened to blow the biomass debris out of the separation chamber 31. Simultaneously, the needle assembly 43 at the second end 55 of the separation chamber 31 forms a sieve-like structure, blocking the stems and leaves of the herbaceous biomass and loose herbaceous biomass clumps. Therefore, the stems and leaves and loose herbaceous biomass clumps remain on one side of the needle assembly 43. Then, the hot air blowing mechanism continues to blow air, slightly heating and drying the herbaceous biomass stems and leaves and loose herbaceous biomass clumps until the herbaceous biomass changes from a soft and pliable state to a brittle state. To prevent excessive moisture inside the herbaceous biomass clumps from forming knots that could affect subsequent combing steps, it's crucial to address the surface tension of the herbaceous biomass fibers due to high moisture content. Loose fiber bundles easily re-agglomerate into soft clumps. If directly entering the combing process, these soft clumps will become stuck between the comb teeth, leading to decreased combing efficiency and potentially requiring machine shutdown for cleaning. The heated air is sourced from waste flue gas provided by the plant, incurring no additional cost. This low-temperature flue gas (180-200℃) consumes no extra energy and is blown at a speed of 8-10 m / s onto the impacted herbaceous biomass fiber bundles. After air drying, the herbaceous biomass fibers become slightly dehydrated and stiffer but not brittle. The needle assembly 43 can easily insert into the gaps between the herbaceous biomass fiber bundles, combing away the tangled fibers, improving combing efficiency and reducing fiber breakage. Finally, a tearing mechanism separates the impacted herbaceous biomass within the separation chamber 31.

[0089] In this embodiment, the hot air blowing mechanism includes an inlet metal hose 32 and an outlet metal hose 33. The inlet metal hose 32 is connected to the first end 54 of the separation chamber 31, and the outlet metal hose 33 is connected to the main outlet of the second end 55 of the separation chamber 31. The outlet metal hose 33 has a Y-shaped structure. One branch of the outlet metal hose 33 is connected to the hopper 10 for conveying biomass debris, and the other branch is connected to the hopper 10 for conveying biomass stems and leaves. A valve is provided inside the outlet metal hose 33 to control the opening and closing of the two branch pipes. An air outlet is also provided at the top of the hopper 10, and a screen is provided inside the air outlet. The air outlet, the inlet metal hose 32, and the outlet metal hose 33 cooperate to form a gas passage. In this embodiment, existing pipeline valves can be used. It should be noted that the structure of the pipeline valve used should avoid trapping herbaceous biomass stems and leaves and biomass debris. For example, a knife gate valve can be used.

[0090] Biomass debris discharged from separation chamber 31 enters silo 10 for separate storage through a branch pipe of the upper exhaust metal hose 33. A screen allows airflow to pass through, while biomass debris and herbaceous biomass stems and leaves are stored in silo 10. After the screen, it can be connected to subsequent pipelines.

[0091] In some embodiments, the striking mechanism includes a striking slide rail module 40, which is disposed on opposite sides of the separation chamber 31; the tearing mechanism includes a lifting seat 41, a bottom rail 42, a pin assembly 43, a pin slide rail module 44, and a clamping mechanism 45. The lifting seat 41 is disposed at the bottom of the separation chamber 31, the bottom rail 42 is driven to the lifting seat 41 and slidably connected to the separation chamber 31, the pin assembly 43 is driven to the pin slide rail module 44, and the clamping mechanism 45 is disposed on the pin slide rail module 44 for controlling the connection and release of the pin assembly 43 and the pin slide rail module 44. The pin assemblies 43 are respectively disposed at opposite ends of the separation chamber 31, and the opposite ends of the separation chamber 31 are provided with insertion holes 46. The second end 55 of the separation chamber 31 is also provided with a holding hole 47 on one side of the insertion hole 46 for inserting the pin assembly 43 into the separation chamber 31. The second end 55 of the separation chamber 31 is also provided with a moving hole 48 at the top.

[0092] When the herbaceous biomass block is tapped, the needle assembly 43 is inserted into the insertion holes 46 at both ends of the separation chamber 31, so that the needle assembly 43 is inserted into both ends of the separation chamber 31 and abuts against the inner bottom surface of the separation chamber 31.

[0093] After the herbaceous biomass block is tapped, the hot air blowing mechanism blows air into the second end 55 of the separation chamber 31, causing the herbaceous biomass to move to the second end 55. The herbaceous biomass is located on one side of the needle assembly 43 at the second end 55 and below the moving hole 48.

[0094] The needle assembly 43 at the first end 54 of the separation chamber 31 moves into the holding hole 47 and presses down the herbaceous biomass. The needle assembly 43 at the second end 55 moves into the moving hole 48, inserts downward into the herbaceous biomass, and moves towards the first end 54 of the separation chamber 31 to tear the herbaceous biomass.

[0095] The lifting seat 41 can drive the bottom track 42 and the separation chamber 31 to rise and fall. The bottom track 42 allows the separation chamber 31 to slide. The tapping slide rail module 40 adopts an existing structure. The tapping slide rail module 40 drives the separation chamber 31 to move horizontally below the hopper 50. Herbaceous biomass blocks enter the separation chamber 31 through the main inlet 34. After entering the separation chamber 31, the electric valve is activated to close the main inlet 34. At this time, the pin-arrangement slide rail module 44 drives the pin-arrangement assembly 43 to move into the insertion holes 46 at the first end 54 and the second end 55 of the separation chamber 31, respectively. Then, the clamping mechanism 45 is controlled to separate the pin-arrangement assembly 43 from the pin-arrangement slide rail module 44, and the pin-arrangement assembly 43 remains in the separation chamber 31. The pin-arrangement slide rail module 44 also adopts an existing structure. The tapping slide rail module 40 begins to move a predetermined distance along the first end 54 of the separation chamber 31, and then moves a predetermined distance towards the second end 55, thus forming a reciprocating motion. Due to the reciprocating motion of the separation chamber 31, the herbaceous biomass blocks inside collide with the needle array assembly 43. Because the needle array assembly 43 has multiple contact points with the herbaceous biomass blocks, the collision results in a good fluffing effect. The density of the needle array assembly 43 is less than the minimum length of the herbaceous biomass blocks. After the collision, the hot air blowing mechanism is activated. Since the hot air blowing mechanism is located at the first end 54 of the separation chamber 31 near the main inlet 34, the intake metal hose 32 blows hot air into the separation chamber 31. The airflow moves from the first end 54 of the separation chamber 31 to the opposite second end 55, causing the herbaceous biomass to move to the second end 55 of the separation chamber 31. At this time, the main outlet is opened, allowing the biomass debris inside the separation chamber 31 to be blown out. Simultaneously, the needle assembly 43 at the second end 55 of the separation chamber 31 forms a sieve-like structure, blocking the stems and leaves of the herbaceous biomass and loose herbaceous biomass clumps. Therefore, the stems and leaves of the herbaceous biomass and loose herbaceous biomass clumps remain on one side of the needle assembly 43. Then, the hot air blowing mechanism continues to blow air, slightly heating and drying the stems and leaves of the herbaceous biomass and loose herbaceous biomass clumps.

[0096] An electric valve is provided on the side of the movable hole 48 to control the opening and closing of the movable hole 48. In this embodiment, the insertion hole 46 corresponds to the needle assembly 43. Multiple insertion holes 46 are provided, spaced apart, and arranged in a rectangular pattern. The insertion holes 46 are arranged along the length and width directions of the separation chamber 31, extending to the two sides of the separation chamber 31 in the width direction. Multiple abutment holes 47, arranged in the same pattern as the insertion holes 46, are also provided on the side of the insertion hole 46 at the second end 55 near the first end 54. The abutment holes 47 are positioned opposite to the insertion holes 46. The movable hole 48 is a rectangular hole, and multiple movable holes 48 are provided only along the length direction parallel to the separation chamber 31. The movable holes 48 are arranged between each column of insertion holes 46. The multiple insertion holes 46 at the first end 54 of the separation chamber 31 and the multiple insertion holes 46 at the second end 55 are staggered, and the movable holes 48 are positioned opposite to the insertion holes 46 at the first end 54. After the moving hole 48 is opened, the lifting seat 41 drives the separation chamber 31 to rise, causing the pin header assembly 43 at the first end 54 of the separation chamber 31 to dock with its corresponding pin header slide rail module 44. Simultaneously, the pin header assembly 43 is clamped by the clamping mechanism 45. The clamping mechanism 45 can be a structure of a clamping motor and a clamping plate. A connecting groove is provided on the slide of the pin header slide rail module 44, and the mounting frame 433 of the pin header assembly 43 can be inserted into the groove. The clamping motor drives the clamping plate to abut against the side of the mounting frame 433, thus fixing the pin header assembly 43. The clamping mechanism 45 can also be an existing robotic arm, which clamps the pin header assembly 43. Simultaneously, the clamping mechanism 45 at the second end 55 is controlled to clamp the pin header assembly 43. After the pin header assembly 43 is clamped, the separation chamber 31 descends, and the pin header assembly 43 detaches from the separation chamber 31. Due to the insertion hole 46 and the pin header assembly 43, the biomass stems and leaves on the pin header assembly 43 will naturally fall off. Driven by the pin slide rail module 44, the pin assembly 43 at the first end 54 and the second end 55 of the separation chamber 31 moves above the moving hole 48 and above the holding hole 47. The separation chamber 31 rises, the pin assembly 43 at the first end 54 moves into the holding hole 47 and presses down the herbaceous biomass, and the pin assembly 43 at the second end 55 moves into the moving hole 48 and inserts downward into the herbaceous biomass, moving towards the first end 54 of the separation chamber 31 to tear the herbaceous biomass.

[0097] During setup, the needles of the needle assembly 43 at the first end 54 can be made sharp, while the needles of the needle assembly 43 at the second end 55 can be made flat, allowing the needles to press against the biomass stems and leaves. Alternatively, the needles of the needle assembly 43 at the first end 54 can be made sharp, allowing it to insert into the biomass stems and leaves. When the needle assembly 43 at the second end 55 moves toward the first end 54 of the separation chamber 31, it can also tear apart herbaceous biomass.

[0098] In this embodiment, a visual recognition device can also be provided to automatically set the insertion position of the needle assembly 43 at the second end 55 in the moving hole 48 based on the recognized image. The moving hole 48 can be set to be longer to facilitate multiple tearing processes of herbaceous biomass stems and leaves. It can also identify stubborn clumps of herbaceous biomass stems and leaves and tear them repeatedly. An electric valve can also be provided on the side of the insertion hole 46. When the insertion hole 46 is empty, the electric valve closes the insertion hole 46 to ensure the sealing of the separation chamber 31. For the closure of the moving hole 48, the electric valve on one side of the moving hole 48 can be a telescopic motor connected to a perforated sealing plate. The needle assembly 43 is inserted into the separation chamber 31 through the hole. When the needle assembly 43 moves, the telescopic motor moves with the needle assembly 43. It should be noted that any equipment or basic structures not mentioned in this application can be implemented using existing equipment.

[0099] After the herbaceous biomass is processed, the hot air blowing mechanism blows air into the second end 55 of the separation chamber 31, causing the biomass debris to be blown out first, thus separating the herbaceous biomass stems and leaves from the biomass debris. Then, the needle assembly 43 connects to the needle slide rail module 44 and moves away from the separation chamber 31, and the hot air blowing mechanism blows air into the second end 55 of the separation chamber 31, blowing out the herbaceous biomass stems and leaves.

[0100] The pin arrangement assembly 43 includes multiple pin arrangement components, which are spaced apart along the width direction of the separation chamber 31. Each pin arrangement component is connected to a mounting frame 433. Each pin arrangement component includes multiple pins 432 arranged along the length direction of the separation chamber 31. The pin arrangement components at the first end 54 of the separation chamber 31 are staggered from those at the second end 55 of the separation chamber 31. The spacing between the pins 432 can be determined based on the thickness and length of the herbaceous biomass to be processed. The spacing of biomass debris can also be determined based on predetermined data.

[0101] This invention also provides a method for preparing powdered biofuel based on biomass embrittlement and upgrading. The method uses a powdered biofuel preparation device based on biomass embrittlement and upgrading, firstly embrittles herbaceous biomass to obtain embrittled biomass, and then uses a coal mill to process the embrittled biomass into biomass powder.

[0102] Specifically, the steps in the preparation method of powdered biofuel include:

[0103] The pre-treated and separated herbaceous biomass stems and leaves and biomass debris are stored in the corresponding bins 10. The bins 10 continuously feed the screw conveyor bins 12 below. The type of herbaceous biomass entering the screw conveyor bins 12 is identified in real time through a visual imaging device.

[0104] If the biomass stems and leaves are identified, the middle section 18 near the feed inlet 14 is closed, while the middle section 18 away from the feed inlet 14 is opened, and the first conveying screw 13 is started to convey the biomass stems and leaves into the middle section 18 away from the feed inlet 14.

[0105] If biomass debris is identified, the intermediate section 18 near the feed inlet 14 is opened, while the intermediate section 18 away from the feed inlet 14 is closed. The first conveying screw 13 is started to convey the biomass debris into the intermediate section 18 near the feed inlet 14. The second conveying screw 16 in the brittleness chamber 15 is started, with the conveying direction opposite to that of the first conveying screw 13. At the same time, a heat source is continuously supplied to the brittleness chamber 15 through the heating channel 19 connected to the external conveying pipe of the brittleness chamber 15.

[0106] After the embrittlement process, the embrittled biomass is discharged through the discharge port 17 at the bottom of the embrittlement chamber 15;

[0107] The brittle biomass is then processed into powdered biomass using a coal mill.

[0108] Example 2

[0109] This application also provides a biomass power generation method, which uses biomass powder prepared by the biomass embrittlement and upgrading method of Example 1 to be mixed with coal powder and then used for combustion power generation.

[0110] Specifically, the embrittled biomass is mixed with coal at a ratio of 10-20% and processed using one of the following two pulverization methods: the embrittled biomass and coal are fed together into a coal mill for rapid pulverization to obtain mixed coal powder; or, the embrittled biomass is first fed separately into a coal mill for pulverization to obtain biomass powder, while the coal is pulverized to obtain coal powder, and then the biomass powder and coal powder are mixed in a burner or boiler.

[0111] The mixed pulverized product or the mixed product after pulverization is injected together with primary hot air into the boiler burner of the power plant. The fuel enters the boiler and is fully burned, forming a coal-biomass coupled power generation mode, which reduces carbon emissions while generating electricity.

[0112] The biomass embrittlement-based powdered biofuel preparation device of Example 1 is used to embrittle biomass to improve its grindability, facilitating its injection into power plant boilers after pulverization, forming biomass fuel that can be coupled with coal for power generation. The embrittled biomass fuel is mixed with coal at a ratio of 10-20%, rapidly pulverized in a coal mill, and then injected into the boiler burner with the same hot air, where it is burned to generate electricity, thus forming a coal-biomass coupled power generation system and reducing carbon emissions. The embrittled biomass can be mixed with coal in a coal mill for pulverization, or it can be pulverized separately and then mixed with pulverized coal in a burner or boiler.

[0113] The above specific embodiments further illustrate the purpose, technical solution and beneficial effects of this application. It should be understood that the above are only specific embodiments of this application and are not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A device for preparing powdered biofuel based on biomass embrittlement and upgrading, characterized in that, include: The silo has separate storage spaces for storing herbaceous biomass stems and leaves and biomass debris; A screw conveyor bin is located below the silo. A first conveying screw is installed inside the screw conveyor bin. The conveying direction is from one end closer to the silo to the other end farther away from the silo. The top of the screw conveyor bin is provided with a feed inlet. The feed inlet is provided with a visual image device for identifying the type of herbaceous biomass material, which includes biomass stems and leaves and biomass debris. The brittleness chamber has a built-in second conveying screw, the conveying direction of which is opposite to that of the first conveying screw. The brittleness chamber is equipped with a heating channel, which is connected to a conveying pipe outside the brittleness chamber. The bottom of the brittleness chamber is equipped with a discharge port and multiple pulsed airflow channels. Two intermediate compartments are located at both ends of the screw conveyor compartment, and the intermediate compartments are respectively connected to the screw conveyor compartment and the embrittlement compartment. Each intermediate compartment is equipped with an electric valve. A biomass pre-separation mechanism includes a cutting mechanism and a separation mechanism. The cutting mechanism is used to cut the biomass stack into multiple herbaceous biomass blocks, and the separation mechanism is used to receive the herbaceous biomass blocks and separate the biomass blocks into biomass stems and leaves and biomass debris. The separation mechanism includes: The separation chamber has a main entrance at its top, and an electric gate at the main entrance is used to control the opening and closing of the main entrance; A striking mechanism, connected to the separation chamber, is used to drive the separation chamber to reciprocate so that the herbaceous biomass blocks inside the separation chamber will impact each other. A tearing mechanism, located above the separation chamber, is used to tear and separate the impacted herbaceous biomass within the separation chamber. A hot air blowing mechanism is provided at the first end of the separation chamber near the main inlet, for blowing hot air into the separation chamber. The airflow flows from the first end of the separation chamber to the opposite second end of the separation chamber, so that the herbaceous biomass moves to the second end of the separation chamber. The second end of the separation chamber is provided with a main outlet. The tearing mechanism includes a lifting seat, a bottom rail, a pin array assembly, a pin array slide rail module, and a clamping mechanism. The lifting seat is located at the bottom of the separation chamber. The bottom rail is driven to the lifting seat and slidably connected to the separation chamber. The pin array assembly is driven to the pin array slide rail module, and the pin array slide rail module drives the pin array assembly to move. The pin array assembly includes multiple pin array pieces, which are spaced apart along the width direction of the separation chamber. Each pin array piece includes multiple pins arranged along the length direction of the separation chamber. The pin array pieces at the first end of the separation chamber are staggered from the pin array pieces at the second end of the separation chamber. The clamping mechanism is disposed on the pin header slide rail module and is used to control the connection and release of the pin header assembly and the pin header slide rail module. The pin header assembly is disposed at opposite ends of the separation chamber. The opposite ends of the separation chamber are provided with insertion holes. The second end of the separation chamber is also provided with a retaining hole on one side of the insertion hole for inserting the pin header assembly into the separation chamber. The top of the second end of the separation chamber is also provided with a moving hole. When the biomass blocks are tapped, the needle array is inserted into the insertion holes at both ends of the separation chamber, so that the needle array is inserted into both ends of the separation chamber and abuts against the inner bottom surface of the separation chamber; the herbaceous biomass blocks inside the separation chamber impact the needle array due to the reciprocating movement of the separation chamber. After the biomass block is tapped, the hot air blowing mechanism blows air into the second end of the separation chamber, causing the biomass to move to the second end. The biomass is located on one side of the needle assembly at the second end and below the moving hole. The needle assembly at the first end of the separation chamber moves into the holding hole and presses down on the biomass. The needle assembly at the second end moves into the moving hole, inserts downward into the biomass, and moves towards the first end of the separation chamber to tear the biomass.

2. The powdered biofuel preparation device based on biomass embrittlement and upgrading according to claim 1, characterized in that, The silo is vertically divided into a stem and leaf bin and a debris bin by a partition. Both the stem and leaf bin and the debris bin have a discharge port at the bottom, and the two discharge ports are close to each other.

3. The powdered biofuel preparation device based on biomass embrittlement and upgrading according to claim 1, characterized in that, The slitting mechanism includes: A slitting bin for holding biomass stacks, wherein one end of the slitting bin has an outlet; A three-axis slide rail module is positioned above the cutting chamber; The cutting blade has a cross-section in the shape of a grid and is connected to the three-axis slide rail module; the slicing mechanism is set in the slicing chamber and slices the herbaceous biomass stack along the height direction of the stack. A conveyor belt assembly is disposed in the bottom groove of the slitting chamber. The conveyor belt of the conveyor belt assembly is flush with the bottom surface of the slitting chamber. One end of the conveyor belt assembly is disposed at the outlet, and the outlet is connected to an inclined downward hopper. A pushing mechanism, located at the bottom of the cutting chamber, is used to push the cut herbaceous biomass blocks in the cutting chamber toward the conveyor belt assembly.

4. The powdered biofuel preparation device based on biomass embrittlement and upgrading according to claim 3, characterized in that, The pushing mechanism includes a pushing slide rail module and a push rod. The push rod is disposed inside the slitting compartment, and the pushing slide rail module is disposed outside the slitting compartment. The pushing slide rail module and the push rod are connected by a connecting rod. The pushing slide rail module can drive the push rod to move towards the conveyor belt assembly. The pushing slide rail module and the push rod include two sets, which are respectively disposed on opposite sides of the conveyor belt assembly.

5. The powdered biofuel preparation device based on biomass embrittlement and upgrading according to claim 1, characterized in that, The hot air blowing mechanism includes an inlet metal hose and an outlet metal hose. The inlet metal hose is connected to the first end of the separation chamber, and the outlet metal hose is connected to the main outlet at the second end of the separation chamber. The outlet metal hose has a Y-shaped structure. One branch of the outlet metal hose is connected to the hopper for conveying biomass debris, and the other branch is connected to the hopper for conveying biomass stems and leaves. A valve is provided inside the outlet metal hose to control the opening and closing of the two branch pipes. An air outlet is also provided at the top of the hopper, and a screen is provided inside the air outlet. The air outlet, the inlet metal hose, and the outlet metal hose cooperate to form a gas passage.

6. A method for preparing powdered biofuel based on biomass embrittlement and upgrading, characterized in that, Using the powdered biofuel preparation device based on biomass embrittlement and upgrading as described in any one of claims 1-5, herbaceous biomass is first subjected to embrittlement treatment to obtain embrittled biomass, and then the embrittled biomass is processed into biomass powder using a coal mill.

7. A biomass power generation method, characterized in that, The biomass powder prepared by the method of preparing powdered biofuel according to claim 6 is mixed with coal powder and then used for combustion power generation.

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