Biomass mill for biomass pulverizing system

Abstract

The invention discloses a biomass mill for a biomass pulverizing system. The biomass mill comprises a shell, a milling mechanism and a separating mechanism, one side wall of the shell is provided with an inlet for inputting straws and high-temperature flue gas, and the top end of the shell is provided with an outlet for conveying powder; the grinding mechanism is rotationally connected into the shell and comprises a mounting plate, a reinforcing plate and blades; the mounting plate and the reinforcing plate are oppositely arranged; the two ends of each blade are fixed to the two opposite side walls of the mounting plate and the reinforcing plate correspondingly so that a cavity between the mounting plate and the reinforcing plate can be divided into a plurality of fan-shaped areas. An air inlet is formed in the middle of the reinforcing plate and corresponds to the inlet; the air inlet is communicated with the fan-shaped area; an air powder inlet in the lower end of the separation mechanism communicates with the outlet to screen powder. The system integrates the functions of raw material drying, crushing, grinding, powder screening and powder conveying, and has important significance on energy utilization of biomass such as straw and reduction of carbon emission.

Description

Technical Field

[0001] The present invention relates to the technical field of biomass pulverizing equipment, and more particularly to a biomass mill used in a biomass pulverizing system. Background Art

[0002] Currently, green development and ecological environmental protection have been elevated to national development strategies. Reducing carbon dioxide emissions has become a global consensus and action. Biomass energy is globally recognized as a zero-carbon energy source. Statistics show that annual biomass agricultural and forestry waste production is approximately 1.05 billion tons, equivalent to 460 million tons of standard coal. Currently, less than 60 million tons of standard coal are actually converted into energy, representing a mere 13% utilization rate. Due to this underutilization, abandonment and open-air burning have led to serious pollution and safety issues.

[0003] Currently, 40% of carbon emissions come from the power sector, primarily coal-fired power plants. By leveraging biomass resources such as agricultural and forestry waste, psammophytes, and energy plants, and implementing the integration of coal-fired power plants with biomass power generation, if these coal-fired power plants are retrofitted with the ability to blend at least 10% of biomass fuel, coal consumption and carbon emissions will be significantly reduced. Biomass-coupled power generation can be broadly categorized into three types: steam-coupled, indirect-coupled, and direct-fired. At current technological levels, direct-fired power generation offers the lowest operating and maintenance costs.

[0004] There are three direct-fired fuel coupling processes. The first is pulverizer coupling, where biomass is mixed with raw coal and fed into an existing coal pulverization system. The biomass and raw coal are then ground into pulverized powder, which is then fed into a burner and burned in the boiler. The second is burner coupling, where the biomass is pulverized in a separate biomass pulverizing unit. The biomass powder is then mixed with pulverized coal and fed into the burner. The third is furnace coupling, where the biomass is pulverized in a separate biomass pulverizing unit before being fed into a separate biomass burner and burned in the boiler. Due to the pulverizer's incompatibility with biomass, the biomass coupling ratio is very low, and pulverizer coupling cannot achieve the desired biomass coupling. Both burner coupling and furnace coupling require biomass to be pulverized. Currently, there are two methods for pulverizing biomass. The first method involves briquetting or pelletizing the biomass to produce biomass fuel briquettes or biomass fuel pellets. The biomass fuel briquettes or biomass fuel pellets are then pulverized into biomass powder using a pulverizer. The second method uses a multi-pass hammer mill to gradually crush the biomass into biomass powder of the required particle size. However, due to unreasonable milling processes and poor performance of milling equipment, biomass milling suffers from high milling costs, poor equipment reliability, and poor adaptability to the material.

[0005] Although direct combustion coupling is the lowest cost way in current biomass coupling, the power generation cost of biomass coupling is still higher than that of raw coal, that is, low-cost, professional and large-scale biomass pulverizing process and system are the technical bottleneck of current biomass coupling power generation. The characteristics of biomass are rich in plant fiber, high moisture content and high volatile matter. The plant fiber has strong toughness in general state, especially in the case of high moisture content, the toughness of plant fiber is greater, so the biomass pulverizing is very difficult, and the traditional coal pulverizing equipment and feed crushing equipment are not suitable for biomass pulverizing.

[0006] Therefore, how to provide a biomass mill integrating functions of raw material drying, crushing, grinding, powder screening and powder conveying is an urgent problem for those skilled in the art. SUMMARY

[0007] Therefore, the present application provides a biomass mill for a biomass pulverizing system, which is suitable for biomass pulverizing of straw, forestry waste, urban landscaping waste, waste wood, aquatic plants such as reed and energy plants such as sand willow, and integrates functions of raw material drying, crushing, grinding, powder screening and powder conveying. It has important significance for energy utilization of biomass such as straw and reduction of carbon emission.

[0008] In order to achieve the above purpose, the present application adopts the following technical solutions:

[0009] A biomass mill for a biomass pulverizing system, comprising:

[0010] A housing, one side wall of the housing is provided with an inlet for inputting straw and high-temperature flue gas, and the top end is provided with an outlet for conveying powder;

[0011] A grinding mechanism, which is rotationally connected in the housing; the grinding mechanism comprises a mounting plate, a reinforcing plate and a blade; the mounting plate and the reinforcing plate are oppositely arranged; the number of the blade is multiple, and both ends of the blade are fixed to the two side walls opposite to the mounting plate and the reinforcing plate to divide the cavity between the mounting plate and the reinforcing plate into multiple sectors; the middle part of the reinforcing plate is provided with an air inlet corresponding to the inlet, and the air inlet communicates with the sectors;

[0012] A separation mechanism, the air-powder inlet at the lower end of the separation mechanism communicates with the outlet to screen the powder.

[0013] The beneficial effect of the technical solution of the present invention is that straw and high-temperature flue gas enter the shell through the inlet, and the high-temperature flue gas is used to dry the straw, remove moisture from the straw, and make it brittle and easy to break; when the grinding mechanism rotates at high speed, air will be sucked in from the air inlet, and then the high-temperature flue gas and straw will be sucked into multiple fan-shaped areas between the mounting plate and the reinforcing plate. After the air passes through the fan-shaped areas, vortices are formed in the shell to stir the dried straw. During the stirring process, the straw will enter the shell through the fan-shaped areas. In this process, the straw collides with the inner wall of the shell and the blades and is broken into straw powder; the straw powder enters the separation mechanism for screening, and the particles with larger particle size re-enter the shell for secondary crushing, and the powder with smaller particle size enters the powder conveying pipeline through the separation mechanism for direct combustion or storage.

[0014] Preferably, a gap is defined between the circumference of the grinding mechanism and the inner sidewall of the housing; the width of the gap gradually increases along the rotational direction of the grinding mechanism. This gradual increase in the gap width can increase ventilation within the housing. After air enters the fan-shaped area from the air inlet, it experiences turbulence within the housing and is ultimately discharged through the powder outlet of the separation mechanism. This change in the gap increases ventilation, improves air vortex efficiency, and thus accelerates straw flow and improves crushing efficiency.

[0015] Preferably, the grinding mechanism further includes a fixed shaft and hammers; one end of the fixed shaft is vertically fixed to the surface of the mounting plate corresponding to the sector-shaped area; and the hammers are provided in a plurality of pieces, one end of each hammer being hinged to the fixed shaft and the other end extending into the gap. During high-speed rotation of the grinding mechanism, the hammers swing within the sector-shaped area, with a portion of the hammers located within the gap further crushing the straw, thereby improving the milling effect and quality.

[0016] Preferably, a clearance groove is provided on the inner wall of the housing corresponding to the smallest gap. When the hammer is located at the smallest gap, the hammer is prevented from colliding with the inner wall of the housing, thereby ensuring high-speed rotation of the grinding mechanism and a good grinding effect.

[0017] Preferably, the separation mechanism includes an outer cone tube, an inner cone tube, a powder discharge pipe and a powder return pipe; the inner cone tube is coaxially fixed in the outer cone tube, and an air-powder circulation channel is provided between the outer wall of the inner cone tube and the inner wall of the outer cone tube, connecting the air-powder inlet and the inner cavity of the inner cone tube; the powder discharge pipe is vertically fixed to the top wall of the outer cone tube and its lower end is connected to the inner cavity of the inner cone tube; one end of the powder return pipe is fixed to the lower end of the inner cone tube, and the other end points to the clearance groove. The air in the shell will carry the crushed powder into the air-powder circulation channel, and then enter the inner cone tube. Under the action of high-speed centrifugal force, the powder with larger particle size enters the clearance groove through the powder return pipe for secondary crushing, and the powder with smaller particle size is transported to the powder conveying pipeline through the powder discharge pipe.

[0018] Preferably, the inner top wall of the outer conical tube is hinged with a plurality of flaps; the flow channel is formed between two adjacent flaps and communicates with the inner cavity of the inner conical tube and the powder flow passage. The flaps are used to screen the particle size of the powder.

[0019] Preferably, the outer top wall of the outer conical tube is provided with a plurality of handles corresponding to the flaps to adjust the opening degree of the flaps. The opening angle of the flaps is adjusted by the handles, and then the particle size of the screened powder is adjusted.

[0020] Preferably, the biomass mill further comprises a feeding pipe, the feeding port of the feeding pipe communicates with the mixer of the biomass powder system, and the discharge port communicates with the inlet. The raw materials in the mixer and the high-temperature flue gas are transported into the shell through the feeding pipe.

[0021] Preferably, the biomass mill further comprises a driving mechanism, the driving mechanism comprises a fixed seat, a motor and a bearing box; the middle part of the mounting plate is fixed with a rotor; the fixed seat is fixed on the side wall of the shell away from the inlet; the motor and the bearing box are fixed on the top surface of the fixed seat; the output shaft of the motor is interference-fitted with the bearing in the bearing box and penetrates through the outer wall of the shell and is fixed with the rotor. The mounting plate is driven to rotate at high speed by the motor, and then the crushing and powdering of the straw are realized.

[0022] Preferably, the shell and the separation mechanism are communicated through a connecting pipe.

[0023] According to the above technical solution, compared with the prior art, the biomass mill for the biomass powder system is provided, the drying, crushing and powdering of the straw are carried out in the shell, the crushed powder can be screened in the separation mechanism, and the powder with qualified particle size is selected for storage or direct combustion. The biomass mill integrates the functions of raw material drying, crushing, powdering, powder screening and powder conveying, and has important significance for the energy utilization of biomass such as straw and the reduction of carbon emissions. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0025] Figure 1 The biomass mill structure schematic diagram provided by the present application;

[0026] Figure 2 The biomass mill structure schematic diagram provided by the present application;

[0027] Figure 3 A schematic diagram of the housing structure provided by the present invention;

[0028] Figure 4 A cross-sectional view of the housing provided by the present invention;

[0029] Figure 5 A schematic diagram of the yield slot provided by the present invention;

[0030] Figure 6 A schematic diagram of the structure of the grinding mechanism provided by the present invention;

[0031] Figure 7 A schematic diagram of the air suction of the grinding mechanism provided by the present invention;

[0032] Figure 8 A cross-sectional view of the separation mechanism provided by the present invention;

[0033] Figure 9 This is a fan blade layout diagram of the separation mechanism provided by the present invention.

[0034] Among them, 1-feed pipe; 11-feed port; 2-shell; 21-inlet; 22-outlet; 23-gap groove; 24-groove side wall; 25-first inclined surface; 26-second inclined surface; 27-arc surface; 3-connecting pipe; 4-separation mechanism; 41-outer cone; 42-inner cone; 43-powder return pipe; 44-air powder inlet; 45-powder outlet pipe; 46-fan; 47-handle; 48-air powder circulation channel; 5-grinding mechanism; 51-mounting plate; 52-rotor; 53-blade; 54-reinforcement plate; 55-hammer; 56-fixed shaft; 57-fan-shaped area; 58-air inlet; 6-driving mechanism; 61-fixed seat; 62-motor; 63-bearing box; 7-support leg; 8-gap. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] See attached Figures 1 to 8According to an embodiment of the present invention, a biomass mill for a biomass pulverizing system realizes the collection and utilization of qualified powder by drying, grinding, screening, and conveying straw in the mill, and includes a shell 2, a grinding mechanism 5, and a separation mechanism 4; a side wall of the shell 2 is provided with an inlet 21 for inputting straw and high-temperature flue gas, and a top end is provided with an outlet 22 for conveying powder; the grinding mechanism 5 is rotatably connected to the shell 2; a gap 8 is formed between the circumference of the grinding mechanism 5 and the inner side wall of the shell 2; the width of the gap 8 gradually increases along the rotation direction of the grinding mechanism 5; the grinding mechanism 5 includes a mounting plate 51, a reinforcing plate 54 and blades 53; the mounting plate 51 and the reinforcing plate 54 are arranged opposite to each other; there are multiple blades 53 and their two ends are fixed to the two side walls opposite to the mounting plate 51 and the reinforcing plate 54 to divide the cavity between the mounting plate 51 and the reinforcing plate 54 into multiple sector-shaped areas 57; an air inlet 58 is opened in the middle of the reinforcing plate 54 and corresponds to the inlet 21, and the air inlet 58 is connected to the sector-shaped area 57; the difference between the outer diameter of the reinforcing plate 54 and the diameter of the air inlet 58 is twice the height T of the blade 53; the shell 2 and the separation mechanism 4 are connected through the connecting pipe 3; the air powder inlet 44 at the lower end of the separation mechanism 4 is connected to the outlet 22 to screen the powder.

[0037] like Figure 4 and 7 As shown, the casing resembles the volute structure of a centrifugal fan housing. A gradual gap is created to ensure effective straw diversion and crushing. Specifically, the distance between the casing's inner wall and the mounting plate's circumference increases as the mounting plate rotates. When the straw and high-temperature flue gas enter the casing, the hot flue gas dries the straw, making it brittle. The grinding mechanism rotates at high speed, and the reinforcing plate draws air through the air inlet. This air enters the casing's inner cavity from the fan-shaped area, forming vortices that turbulently stir the straw within the casing. During this high-speed turbulence, the dried straw collides with the casing's inner wall and blades, breaking it into powder.

[0038] like Figure 1 and 3 As shown, the outlet at the upper end of the shell is square, and the air powder inlet at the lower end of the separation mechanism is circular. Therefore, the separation mechanism and the shell are connected through a connecting pipe, and the lower end of the connecting pipe is a square opening and the upper end is a circular opening.

[0039] In other specific embodiments, to improve the quality of straw flour production, the grinding mechanism 5 further includes a fixed shaft 56 and hammers 55; one end of the fixed shaft 56 is vertically fixed to the surface of the mounting plate 51 corresponding to the sector 57; multiple hammers 55 are provided, one end of each hammer 55 being hinged to the fixed shaft 56 and the other end extending into the gap 8. Each sector is fixed with a fixed shaft, each of which is equipped with two to four hammers. The hammers can swing within the sector but do not move axially along the fixed shaft. The hammers extend into the gap. During the high-speed rotation of the mounting plate, the swing of the hammers can deeply crush the straw in the gap, ensuring the quality of flour production.

[0040] In order to further optimize the above technical solution, a clearance groove 23 is provided on the inner wall of the housing 2 corresponding to the smallest gap 8. Since the distance between the inner wall of the housing 2 and the peripheral surface of the mounting plate 51 in the gap is gradually changing, when the hammer 53 rotates to the gap corresponding to the narrowest position, it will enter the clearance groove 23. The provision of the clearance groove 23 ensures the normal operation of the hammer 54 and prevents the hammer 54 from interfering with the inner wall of the housing 2 at the position with the smaller gap. Figure 4 and 5 As shown, the clearance groove 23 includes two groove side walls 24, and the groove bottom wall of the clearance groove 23 is composed of a first inclined surface 25, a second inclined surface 26 and an arc surface 27 from top to bottom. The first inclined surface 25 extends to the upper end surface of the shell 2; the second inclined surface 26 connects the first inclined surface 25 and the arc surface 27, and the angle between the second inclined surface 26 and the horizontal plane is 22°~25°. The lower end of the arc surface 27 is connected to the transition arc surface of the inner bottom wall of the shell 2, and the center of the arc surface 27 coincides with the rotation center of the mounting plate 51.

[0041] In this embodiment, the separation mechanism 4 includes an outer conical tube 41, an inner conical tube 42, a powder discharge pipe 45 and a powder return pipe 43; the inner conical tube 42 is coaxially fixed in the outer conical tube 41, and multiple support plates are welded between the outer wall of the inner conical tube 42 and the inner wall of the outer conical tube 41, and the coaxial fixation between the inner conical tube 42 and the outer conical tube 41 is achieved by multiple support plates; there is an air-powder circulation channel 48 connecting the air-powder inlet 44 and the inner cavity of the inner conical tube 42 between the outer wall of the inner conical tube 42 and the inner wall of the outer conical tube 41; the powder discharge pipe 45 is vertically fixed on the top wall of the outer conical tube 41 and its lower end is connected to the inner cavity of the inner conical tube 42; one end of the powder return pipe 43 is fixed on the lower end of the inner conical tube 42, and the other end points to the give way groove 23.

[0042] To further optimize the above technical solution, multiple blades 46 are hingedly connected to the inner top wall of the outer conical tube 41. Adjacent blades 46 form a flow channel, connecting the air and powder circulation channel 48 with the inner cavity of the inner conical tube 42. The outer top wall of the outer conical tube 41 is provided with multiple handles 47, corresponding to the blades 46, to adjust the degree of opening and closing of the blades 46.

[0043] like Figure 8As shown, the conical surfaces of the inner and outer cones are designed to control the cross-sectional area of ​​air-powder flow between them, maintaining a sufficient airflow velocity. The air-powder mixture passes through the vanes at the upper end of the outer cone and is discharged through the powder discharge pipe. As the air flows through the vanes, they guide the airflow, creating a rotating flow field. Large particles in the air-powder mixture are separated from the airflow by centrifugal force and fall into the inner cone. They then pass through the powder return pipe and into the chute for secondary crushing. Small particles are carried by the airflow through the powder discharge pipe and into the powder conveying pipeline.

[0044] The angle of the blades can be adjusted by a handle connected to the blades, changing the intensity of the rotating flow field. The stronger the intensity, the smaller the particle size of the discharged powder. The separation mechanism of this embodiment can screen powders of different particle sizes by adjusting the angle of the blades, thereby ensuring the production quality of the powder.

[0045] In some other specific embodiments, a feed pipe 1 is further included, wherein the feed port 11 of the feed pipe 1 is connected to the mixer of the biomass milling system, and the discharge port is connected to the inlet 21. A first pressure sensor is fixed on the wall of the feed pipe 1 near the feed port 11.

[0046] In order to further optimize the above technical solution, a driving mechanism 6 is also included, which includes a fixed seat 61, a motor 62 and a bearing box 63; a rotor 52 is fixed in the middle of the mounting plate 51; the fixed seat 61 is fixed on a side wall of the shell 2 away from the inlet 21; the motor 62 and the bearing box 63 are fixed on the top surface of the fixed seat 61; the output shaft of the motor 62 is interference fit with the bearing in the bearing box 63 and passes through the outer wall of the shell 2 and is fixed to the rotor 52.

[0047] In order to further optimize the above technical solution, a temperature sensor and a second pressure sensor are fixed to the outer wall of the powder discharge pipe.

[0048] Example 1

[0049] An embodiment of the present invention provides a biomass powder production method using sugarcane leaves as raw materials. The biomass mill in Example 1 is used. After the biomass mill is started, the high-speed rotation of the rotor causes the grinding mechanism to draw air from the feed inlet at the feed pipe, enter the shell from the fan-shaped area and generate vortexes, and finally exhaust air from the powder discharge pipe.

[0050] After initial crushing, sugarcane leaves that meet the required size and high-temperature flue gas enter the mixer for preliminary drying. The dried straw then enters the shell through the feed port. Inside the shell, the sugarcane leaves are carried by the grinding mechanism and rotated at high speed. They are fully mixed with the high-temperature flue gas, quickly and thoroughly dried, becoming brittle and easily broken. Inside the shell, the sugarcane leaves collide with the blades and the inner wall of the shell, becoming crushed.

[0051] After drying the sugarcane leaves, the high-temperature flue gas significantly cools them, carrying the powder into the powder separation channel. A separation mechanism separates coarse and fine powder, with the flue gas carrying the fine powder out of the powder discharge pipe. A small amount of unqualified coarse powder returns to the lower housing through the air-powder circulation channel, while the majority of unqualified coarse powder passes through the inner conical tube and the powder return pipe and returns to the lower housing's chute. The hammers work in conjunction with the chute to enhance crushing power, further pulverizing the tougher plant fibers in the sugarcane leaves into fine powder in the chute.

[0052] Experiments have determined that sugarcane leaves achieve optimal pulverization at a drying temperature of 140°C to 150°C, so the outlet temperature is set between 140°C and 150°C. Assuming a 20% moisture content for the sugarcane leaves and a drying medium to biomass mass ratio of 2, heat balance calculations determined the high-temperature flue gas temperature, serving as the drying medium, to be between 388°C and 405°C. As the moisture content of the sugarcane leaves changes, the temperature of the air-powder mixture at the powder outlet pipe also changes. The drying medium temperature is adjusted accordingly to ensure the outlet temperature remains within the set range.

[0053] When the biomass mill is operating, the filling rate of sugarcane leaves within the shell has an optimal range. A filling rate that is too low will result in low crushing efficiency and low milling output, while a filling rate that is too high will cause the main motor to overload and even cause the rotor to jam and block the mill. The filling rate of sugarcane leaves within the shell is positively correlated with the resistance of the biomass mill; as the filling rate increases, the resistance also increases. The first and second pressure sensors monitor the pressure at the inlet and outlet of the biomass mill in real time, generating a resistance curve for the biomass mill during operation. Using the corresponding relationship between filling rate and resistance, the biomass mill filling rate can be kept within the optimal range as long as the resistance is controlled within the set range. For example, if the resistance falls below the lower limit of the set range, it indicates that the filling rate is too low. In this case, increasing the feed amount will cause the filling rate to rise as the feed amount increases, and the resistance will also increase, and vice versa.

[0054] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0055] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A biomass mill for a biomass pulverizing system, characterized in that: include: A shell (2), wherein a side wall of the shell (2) is provided with an inlet (21) for inputting straw and high-temperature smoke, and a top end is provided with an outlet (22) for conveying powder; A grinding mechanism (5), the grinding mechanism (5) is rotatably connected in the housing (2); the grinding mechanism (5) comprises a mounting plate (51), a reinforcing plate (54) and blades (53); the mounting plate (51) and the reinforcing plate (54) are arranged relative to each other and their plate surfaces are arranged parallel to the side walls of the housing (2); the number of the blades (53) is plural and the two ends of the blades (53) are respectively fixed to the two side walls opposite to the mounting plate (51) and the reinforcing plate (54) so ​​as to divide the cavity between the mounting plate (51) and the reinforcing plate (54) into a plurality of sector-shaped areas (57); an air inlet (58) is provided in the middle of the reinforcing plate (54) and corresponds to the inlet (21), and the air inlet (58) is connected to the sector-shaped areas (57); A separation mechanism (4) is provided at the lower end of the separation mechanism (4) with an air powder inlet (44) connected to the outlet (22) for screening the powder.

2. The biomass mill for a biomass powder production system according to claim 1, characterized in that: A gap (8) is provided between the circumference of the grinding mechanism (5) and the inner side wall of the shell (2); the width of the gap (8) gradually increases along the rotation direction of the grinding mechanism (5).

3. The biomass mill for a biomass powder production system according to claim 2, characterized in that: The grinding mechanism (5) further comprises a fixed shaft (56) and hammers (55); one end of the fixed shaft (56) is vertically fixed to the plate surface of the mounting plate (51) corresponding to the sector (57); the hammers (55) are provided in a plurality of pieces, one end of each of the plurality of hammers (55) being hinged to the fixed shaft (56) and the other end extending to the gap (8).

4. The biomass mill for a biomass powder production system according to claim 3, characterized in that: A clearance groove (23) is provided on the inner wall of the housing (2) corresponding to the gap (8) with the smallest width.

5. The biomass mill for a biomass powder production system according to claim 4, characterized in that: The separation mechanism (4) includes an outer conical tube (41), an inner conical tube (42), a powder discharge pipe (45) and a powder return pipe (43); the inner conical tube (42) is coaxially fixed in the outer conical tube (41), and an air-powder circulation channel (48) is provided between the outer wall of the inner conical tube (42) and the inner wall of the outer conical tube (41), which connects the air-powder inlet (44) and the inner cavity of the inner conical tube (42); the powder discharge pipe (45) is vertically fixed to the top wall of the outer conical tube (41) and its lower end is connected to the inner cavity of the inner conical tube (42); one end of the powder return pipe (43) is fixed to the lower end of the inner conical tube (42), and the other end points to the give way groove (23).

6. The biomass mill for a biomass powder production system according to claim 5, characterized in that: The inner top wall of the outer cone tube (41) is hinged with a plurality of blades (46); a flow channel is formed between two adjacent blades (46) and connects the air-powder circulation channel (48) and the inner cavity of the inner cone tube (42).

7. The biomass mill for a biomass powder production system according to claim 6, characterized in that: The outer top wall of the outer cone tube (41) is provided with a plurality of handles (47) corresponding one-to-one to the fan blades (46) for adjusting the opening and closing degree of the fan blades (46).

8. The biomass mill for a biomass powder production system according to claim 1, characterized in that: It also comprises a feed pipe (1), wherein the feed port (11) of the feed pipe (1) is connected to the mixer of the biomass pulverizing system, and the discharge port is connected to the inlet (21).

9. The biomass mill for a biomass powder production system according to claim 1, characterized in that: The invention also includes a driving mechanism (6), the driving mechanism (6) including a fixing seat (61), a motor (62) and a bearing box (63); a rotor (52) is fixed to the middle of the mounting plate (51); the fixing seat (61) is fixed to a side wall of the housing (2) away from the inlet (21); the motor (62) and the bearing box (63) are fixed to the top surface of the fixing seat (61); the output shaft of the motor (62) is interference-fitted with the bearing in the bearing box (63) and passes through the outer wall of the housing (2) to be fixed to the rotor (52).

10. The biomass mill for a biomass powder production system according to claim 1, characterized in that: The housing (2) and the separation mechanism (4) are connected via a connecting pipe (3).

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