Biomass particle drying device

Abstract

The invention discloses a biomass particle drying device and belongs to the technical field of solid material drying. The biomass particle drying device comprises a circulating lifting type drying tower and a downward evacuation air drying layer tower; the circulating lifting type drying tower comprises a bottom box, a top box, an ascending cylinder communicating the bottom box with the top box, a descending cylinder and a circulating conveyor. A circle of drying bearing hoppers are mounted on the circulating conveyor; a hot air inlet pipe is mounted at the lower end of the rising cylinder; a waste heat return pipe is mounted at the upper end part of the ascending cylinder; the downlink dispersing and drying layer tower comprises a plurality of layers of funnel-shaped dispersing and drying leakage grooves with hollow structures; the multiple layers of funnel-shaped dispersing and drying leakage grooves are jointly communicated with an air guide pipe. Through the combination of the circulating lifting type drying tower and the descending evacuation air drying layer tower, one-up-one-down continuous distributed drying operation is achieved; by means of the mode, the requirement for continuous drying in the biomass particle production process is met, the occupied area is reduced through longitudinal space extension, and compared with a traditional drum type dryer, the drum type dryer is more efficient and saves space.

Description

Technical Field

[0001] The invention relates to the technical field of solid material drying, and in particular to a biomass particle drying device. Background Art

[0002] In the field of solid material drying technology, especially in the drying process of biomass pellets, traditional equipment and methods face many challenges. These challenges are not only related to drying efficiency and effect, but also involve many factors such as energy consumption, equipment floor space and environmental protection. The following analyzes the background and existing problems of traditional biomass pellet drying technology from several key perspectives.

[0003] Traditional solid material drying mainly adopts the method of overall loading and removal, or uses a drum-type continuous drying method. These methods have single functions and often require large equipment and space to complete the drying process, making it difficult to achieve a balance between high efficiency and high output. Especially when dealing with fragile and irregularly shaped materials such as biomass pellets, traditional drum drying methods are prone to increase material residues, affecting product quality and production efficiency.

[0004] Traditional drying technologies often consume a lot of energy and fail to fully utilize heat. For example, the waste heat generated during the drying process is usually discharged without being recycled, resulting in energy waste and increased operating costs. In addition, the drying process may generate a large amount of dust and gas emissions, which will have a negative impact on the working environment and the atmospheric environment if there is no effective collection and treatment device.

[0005] For most traditional drying equipment, their design requires a large installation and operation space. This not only limits the scope of application of the equipment (such as being difficult to use in factories or production lines with limited space), but also increases the investment cost of enterprises in site leasing or purchasing.

[0006] Traditional drying methods make it difficult to ensure uniform drying of materials, especially when dealing with biomass pellets with high moisture content or uneven density. Uneven drying not only affects the final quality of the product, but may also cause problems during storage and transportation (such as caking or mildew caused by local moisture).

[0007] In summary, the traditional biomass pellet drying technology has many limitations such as low efficiency, energy waste, large equipment footprint and environmental issues. These problems have made technology and equipment innovation an urgent need for industry development. To this end, this application document provides a biomass pellet drying device to solve the above technical problems. Summary of the invention

[0008] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a biomass pellet drying device, which realizes an up-and-down continuous dispersed drying operation through the combination of a circulating lifting drying tower and a downward evacuation air-drying layer tower, thereby meeting the demand for continuous drying in the biomass pellet production process.

[0009] In order to solve the above technical problems, the present invention adopts the following technical scheme: the present invention provides a biomass particle drying device, including a circulating lifting drying tower and a descending evacuation air drying layer tower; the circulating lifting drying tower includes a bottom box, a top box, an ascending cylinder and a descending cylinder connecting the bottom box and the top box; a circulating conveyor is installed on the bottom box, the top box, the ascending cylinder and the descending cylinder; a circle of drying supporting buckets is installed on the circulating conveyor; a hot air inlet pipe is installed at the lower end of the ascending cylinder; a waste heat return pipe is installed at the upper end of the ascending cylinder; a feed port is installed at the lower end of the descending cylinder; a discharge port is provided on the same side of the top box and the feed port; the descending evacuation air drying layer tower includes several layers of hollow funnel-shaped dispersed drying troughs; several layers of the funnel-shaped dispersed drying troughs are commonly connected to an air duct; an axial flow fan is installed at the end of the waste heat return pipe; the axial flow fan is connected to the air duct through the air duct.

[0010] Preferably, the hot air inlet pipe is connected to a drying hot air blower via a hot air pipe.

[0011] Preferably, the circulating conveyor includes a driving wheel, a driven wheel, an external gear plate, a conveying chain, a conveyor belt and a reduction motor; the driving wheel is installed in the top box; the driven wheel is installed in the bottom box; the driving wheel and the driven wheel are respectively installed with two external gear plates; the driving wheel and the driven wheel are driven by two conveying chains; the conveyor belt is installed on the two conveying chains; the drying support bucket is riveted on the conveyor belt; the reduction motor is installed on the outside of the top box for driving the driving wheel; the bottom box and the top box are both provided with an inspection hatch.

[0012] Preferably, the drying support bucket comprises a rectangular box body with an upper opening; a row of upwardly protruding semicircular arches are arranged at the bottom of the rectangular box body; a row of arched air vents are arranged along the axial direction of the semicircular arches; a connecting plate riveted to the conveyor belt is fixed to one side of the rectangular box body.

[0013] Preferably, several layers of the funnel-shaped dispersion and drying troughs are fixed together on four supporting columns; a pointed cone cylinder with a pointed head pointing upward is suspended and installed below the funnel-shaped dispersion and drying trough by four fixed connecting rods, and the outer diameter of the pointed cone cylinder is larger than the radius of the funnel-shaped dispersion and drying trough; a circular downward air outlet ring is provided at the lower end of the funnel-shaped dispersion and drying trough; a funnel is fixed on the four fixed connecting rods, and the funnel is located below the lowest funnel-shaped dispersion and drying trough; the lower end of the funnel is fixedly connected to a guide pipe inclined downward.

[0014] Preferably, several layers of the funnel-shaped dispersion and drying troughs are fixed together on four supporting columns; a pointed cone cylinder with a pointed head pointing upward is suspended and installed below the funnel-shaped dispersion and drying trough by four fixed connecting rods, and the outer diameter of the pointed cone cylinder is larger than the radius of the funnel-shaped dispersion and drying trough; a circular downward air outlet ring is provided at the lower end of the funnel-shaped dispersion and drying trough; a funnel is fixed on the four fixed connecting rods, and the funnel is located below the lowest funnel-shaped dispersion and drying trough; the lower end of the funnel is fixedly connected to a guide pipe inclined downward.

[0015] Preferably, a first diamond gauze is provided at the connection between the hot air inlet pipe and the rising tube; a second diamond gauze is provided at the connection between the waste heat return pipe and the rising tube.

[0016] Preferably, the outer sides of several layers of the funnel-shaped dispersion and drying troughs and the outer side of the funnel are wrapped with an outer ring tube; the outer wall of the outer ring tube is fixedly connected with an air outlet pipe; the air outlet pipe is located between the funnel and the bottom funnel-shaped dispersion and drying trough.

[0017] Preferably, a shielding cover is fixed to the upper end surface of the funnel-shaped dispersion and drying trough at the uppermost end; the shielding cover is provided with a window for inserting the discharge port.

[0018] The beneficial effects of the present invention are:

[0019] 1. The present invention realizes a continuous decentralized drying operation by combining a circulating lifting drying tower with a downward evacuation air drying layer tower. This method not only meets the demand for continuous drying in the production process of biomass particles, but also extends the overall structure to the longitudinal space, significantly reducing the floor space, and is more efficient and space-saving than traditional drum dryers.

[0020] 2. The design of the circulating lifting drying tower of the present invention includes a bottom box, a top box, an ascending cylinder and a descending cylinder, which cooperate with a circulating conveyor and a drying supporting bucket thereon, so that the biomass particles can be heated more evenly during the drying process, thereby improving the drying efficiency and particle quality.

[0021] 3. The drying support bucket of the present invention adopts a rectangular box body with an upper opening, a row of upwardly protruding semicircular arches are arranged at the bottom, and arched ventilation holes are opened. This design increases the relative contact area of ​​biomass particles and improves the ventilation performance, so that hot air can quickly flow through the gaps between particles, effectively heating and taking away moisture.

[0022] 4. The present invention uses the configuration of hot air inlet pipes and waste heat return pipes, as well as the function of axial flow fans, to transport the waste heat airflow after the hot air heats the biomass particles in the multi-layer drying support bucket to the downward evacuation air drying layer tower for reuse. This not only improves the efficiency of energy use, but also reduces operating costs.

[0023] 5. The drying equipment of the present invention takes dust suppression and dust collection into consideration, such as setting diamond yarn nets to prevent hot air inlet pipes and waste heat return pipes from disturbing the airflow and bringing in particles, and connecting the air outlet pipe of the outer ring tube to an external bag-type dust collector to collect dust. These measures help improve the working environment and protect the atmospheric environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic structural diagram of a biomass particle drying device according to an embodiment of the present invention.

[0026] Figure 2 This is a schematic diagram of the structure of the circulating lifting drying tower after removing the two inspection hatch covers.

[0027] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0028] Figure 4 for Figure 2 A partial enlarged view of point B in the middle.

[0029] Figure 5 It is a schematic diagram of the axial section of a circulating lifting drying tower.

[0030] Figure 6 It is a structural schematic diagram of the downward evacuation air-drying layer tower.

[0031] Figure 7 It is a schematic diagram of the axial cross-section of the downward evacuation air-drying layer tower.

[0032] Figure 8 for Figure 7A partial enlarged view of point C in the middle.

[0033] Fig. 9 It is a structural schematic diagram of the drying support bucket.

[0034] Fig.10 It is a structural diagram of embodiment 2.

[0035] Description of reference numerals: 1-circulating lifting drying tower, 2-downward evacuation air drying layer tower, 3-axial flow fan, 4-air guide pipe, 5-hot air pipe, 6-drying hot air blower, 7-outer ring cylinder, 8-shielding cover, 71-air outlet pipe, 81-window, 11-bottom box, 12-top box, 13-ascending cylinder, 14-descending cylinder, 15-drying support bucket, 16-hot air inlet pipe, 17-waste heat return pipe, 18-feeding port, 19-discharging port, 110-driving wheel , 111-driven wheel, 112-external gear plate, 113-conveying chain, 114-conveyor belt, 115-reduction motor, 116-inspection hatch, 151-rectangular box body, 152-semicircular arched portion, 153-arched air vent, 154-connecting plate, 21-funnel-shaped dispersed drying trough, 22-air guide pipe, 23-support column, 24-fixed connecting rod, 25-pointed cone, 26-air outlet ring, 27-funnel, 28-guide pipe. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention. Specific embodiment one:

[0038] See also Figure 1-9 As shown, the present invention is a biomass pellet drying device, including a circulating lifting drying tower 1 for drying during the lifting process and a descending evacuation air drying layer tower 2 for slow cooling and heating drying from the upper linear multi-stage dispersion aggregation and re-dispersion and re-aggregation. The circulating lifting drying tower 1 and the descending evacuation air drying layer tower 2 adopt a continuous and dispersed drying operation from top to bottom, which can meet the requirements of continuous drying in the production process of biomass pellets. In addition, the overall structure extends to the longitudinal space, and the area occupied is reduced relative to the drum dryer.

[0039] Furthermore, the structure of the circulating lifting drying tower 1 specifically includes a bottom box 11, a top box 12, an ascending cylinder 13 and a descending cylinder 14 connecting the bottom box 11 and the top box 12. A circulating conveyor is installed on the bottom box 11, the top box 12, the ascending cylinder 13 and the descending cylinder 14. A circle of drying support buckets 15 is installed on the circulating conveyor. Further, the structure of the drying support bucket 15 specifically includes a rectangular box body 151 with an upper opening. A row of semicircular arches 152 protruding upward are provided at the bottom of the rectangular box body 151. The semicircular arches 152 are provided with a row of arched vents 153 along their axial direction. A connecting plate 154 riveted to the conveyor belt 114 is fixed on one side of the rectangular box body 151.

[0040] The biomass particles are supported upward by a row of upwardly protruding semicircular arches 152 inside the drying support bucket 15. The relative contact area of ​​the biomass particles in the drying support bucket 15 is increased, and the ventilation performance of the biomass particles is improved. The hot air flows upward from the bottom of the drying support bucket 15 and quickly flows through the gaps between the biomass particles in the drying support bucket 15, heating the biomass particles and taking away the evaporated water in the process.

[0041] A hot air inlet pipe 16 is installed at the lower end of the rising tube 13, and the hot air inlet pipe 16 points obliquely upward to the inner cavity of the rising tube 13. The external heating equipment supplies hot air from the hot air inlet pipe 16 to the rising tube 13 to heat and dry the biomass particles in the drying support bucket 15.

[0042] Furthermore, the device for supplying heat to the hot air inlet pipe 16 is preferably a drying hot air blower 6 heated by electric energy. The hot air inlet pipe 16 is connected to the drying hot air blower 6 through the hot air pipe 5.

[0043] The downward evacuation air drying layer tower 2 comprises a plurality of layers of hollow funnel-shaped dispersion drying troughs 21. The plurality of layers of funnel-shaped dispersion drying troughs 21 are connected to an air guide pipe 22.

[0044] A waste heat return pipe 17 is installed at the upper end of the ascending cylinder 13. An axial flow fan 3 is installed at the end of the waste heat return pipe 17. The axial flow fan 3 is connected to the air guide pipe 22 of the downward evacuation air drying layer tower 2 through the air guide pipe 4. The waste heat airflow after the hot air heats the biomass particles in the multi-layer drying support bucket 15 is transported to the downward evacuation air drying layer tower 2 through the axial flow fan 3 and the air guide pipe 4 for reuse.

[0045] A feed port 18 is installed at the lower end of the descending cylinder 14, and the biomass particles produced by the granulator are transported to the feed port 18 via a conveyor belt. A discharge port 19 is arranged on the same side of the top box 12 and the feed port 18. After the first drying in the circulating lifting drying tower 1, the biomass particles enter the funnel-shaped dispersion drying trough 21 at the top of the descending evacuation air drying layer tower 2.

[0046] Further, the circulating conveyor includes a driving wheel 110, a driven wheel 111, an outer gear plate 112, a conveying chain 113, a conveyor belt 114 and a reduction motor 115. The driving wheel 110 is installed in the top box 12. The driven wheel 111 is installed in the bottom box 11. The driving wheel 110 and the driven wheel 111 are respectively equipped with two outer gear plates 112. The driving wheel 110 and the driven wheel 111 are driven by two conveying chains 113. The conveyor belt 114 is installed on the two conveying chains 113. The drying support bucket 15 is riveted on the conveyor belt 114. The reduction motor 115 is installed on the outside of the top box 12 to drive the driving wheel 110. The bottom box 11 and the top box 12 are both provided with an inspection hatch 116. The circulating conveyor drives a circle of drying support buckets 15 to circulate back and forth to divide the biomass particles from bottom to top into small pieces for transportation, and completes the first drying process in the ascending cylinder 13.

[0047] The residual heat airflow after the hot air heats the biomass particles in the multi-layer drying support bucket 15 is transported to the several layers of funnel-shaped dispersion drying troughs 21 of the downward evacuation air-drying layer tower 2 through the axial flow fan 3 and the air guide 4, and the funnel-shaped dispersion drying troughs 21 are heated. Further, the several layers of funnel-shaped dispersion drying troughs 21 in the downward evacuation air-drying layer tower 2 are fixed together on four supporting columns 23. The pointed cone cylinder 25 with the pointed tip upward is suspended and installed below the funnel-shaped dispersion drying trough 21 through four fixed connecting rods 24, and the outer diameter of the pointed cone cylinder 25 is larger than the radius of the funnel-shaped dispersion drying trough 21. The biomass particles are heated, evaporated, dried and gathered in the funnel-shaped dispersion drying trough 21. The gathered biomass particles fall from the middle to the tip of the pointed cone cylinder 25 below, and then disperse to the surroundings, and then fall into the funnel-shaped dispersion drying trough 21 of the next layer again, and then gather again. The whole process of reciprocating dispersion, convergence and drying is carried out many times.

[0048] The lower end of the funnel-shaped dispersion drying trough 21 is provided with an annular downward air outlet ring 26. The four fixed connecting rods 24 are fixed with a funnel 27, and the funnel 27 is located below the lowest funnel-shaped dispersion drying trough 21. The lower end of the funnel 27 is fixedly connected with a downwardly inclined guide pipe 28. After secondary drying through several layers of funnel-shaped dispersion drying troughs 21, the biomass particles enter the lower funnel 27 and flow from the guide pipe 28 to the next process.

[0049] Furthermore, in order to prevent the hot air inlet pipe 16 and the waste heat return pipe 17 from entering the biomass particles under the disturbed airflow and ensure the normal operation of the entire drying device, a first diamond gauze is provided at the connection between the hot air inlet pipe 16 and the riser 13. A second diamond gauze is provided at the connection between the waste heat return pipe 17 and the riser 13. Specific embodiment 2:

[0051] Based on the specific embodiment 1, the difference of this embodiment is that:

[0052] like Fig.10 As shown, the outer sides of the multiple layers of funnel-shaped dispersion and drying troughs 21 and the outer sides of the funnels 27 are wrapped with outer ring cylinders 7. The outer wall of the outer ring cylinder 7 is fixedly connected with an air outlet pipe 71. The air outlet pipe 71 is located between the funnel 27 and the bottom funnel-shaped dispersion and drying trough 21.

[0053] When the outer ring cylinder 7 is provided, dust can be suppressed on the one hand, and the airflow velocity on the surface of the biomass particles in the downward evacuation air-drying layer tower 2 can be increased on the other hand, accelerating the evaporation of water in the biomass particles under the heating state. At the same time, the temperature of the biomass particles when being output in the downward evacuation air-drying layer tower 2 is reduced, which is convenient for the subsequent production of the biomass particles.

[0054] The air outlet pipe 71 is connected to the bag-type dust collector outside the workshop through the dust removal corridor of the workshop to collect the dust generated during the drying process. The collected dust can be used again in biomass production.

[0055] Furthermore, in order to reduce dust during the process of transporting biomass particles from the circulating lifting drying tower 1 to the downward evacuation air drying layer tower 2, a shielding cover 8 is fixed on the upper end surface of the uppermost funnel-shaped dispersion drying trough 21. The shielding cover 8 is provided with a window 81 for inserting the discharge port 19.

[0056] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A biomass pellet drying device, characterized in that: It comprises a circulating lifting drying tower (1) and a descending evacuation air drying layer tower (2); The circulating lifting drying tower (1) comprises a bottom box (11), a top box (12), an ascending cylinder (13) and a descending cylinder (14) which are connected to the bottom box (11) and the top box (12); a circulating conveyor is installed on the bottom box (11), the top box (12), the ascending cylinder (13) and the descending cylinder (14); a circle of drying support buckets (15) is installed on the circulating conveyor; a hot air inlet pipe (16) is installed at the lower end of the ascending cylinder (13); a waste heat return pipe (17) is installed at the upper end of the ascending cylinder (13); a feed port (18) is installed at the lower end of the descending cylinder (14); a discharge port (19) is provided on the same side of the top box (12) and the feed port (18); The downward evacuation air drying layer tower (2) comprises a plurality of layers of hollow funnel-shaped dispersion drying troughs (21); the plurality of layers of the funnel-shaped dispersion drying troughs (21) are connected to an air guide pipe (22); An axial flow fan (3) is installed at the end of the waste heat return pipe (17); the axial flow fan (3) is connected to the air guide pipe (22) through the air guide pipe (4).

2. A biomass particle drying device according to claim 1, characterized in that: The hot air inlet pipe (16) is connected to a drying hot air blower (6) via a hot air pipe (5).

3. The biomass particle drying device according to claim 1, characterized in that: The circulating conveyor comprises a driving wheel (110), a driven wheel (111), an external gear plate (112), a conveying chain (113), a conveying belt (114) and a reduction motor (115); the driving wheel (110) is installed in the top box (12); the driven wheel (111) is installed in the bottom box (11); the driving wheel (110) and the driven wheel (111) are each respectively installed with two external gear plates (112); the driving wheel (110) and the driven wheel (111) are driven by the two conveying chains (113); the conveying belt (114) is installed on the two conveying chains (113); the drying support bucket (15) is riveted on the conveying belt (114); the reduction motor (115) is installed on the outside of the top box (12) to drive the driving wheel (110); the bottom box (11) and the top box (12) are both provided with an inspection hatch (116).

4. A biomass particle drying device as claimed in claim 3, characterized in that: The drying support bucket (15) comprises a rectangular box body (151) with an upper opening; a row of upwardly protruding semicircular arched portions (152) are arranged at the bottom of the rectangular box body (151); a row of arched vent holes (153) are arranged along the axial direction of the semicircular arched portions (152); and a connecting plate (154) riveted to the conveyor belt (114) is fixed to one side of the rectangular box body (151).

5. The biomass pellet drying device according to claim 1, characterized in that: Several layers of the funnel-shaped dispersion and drying troughs (21) are fixed together on four supporting columns (23); a pointed cone cylinder (25) with a pointed tip facing upward is suspended and installed below the funnel-shaped dispersion and drying trough (21) through four fixed connecting rods (24); a circular downward air outlet ring (26) is provided at the lower end of the funnel-shaped dispersion and drying trough (21); a funnel (27) is fixed on the four fixed connecting rods (24), and the funnel (27) is located below the lowest funnel-shaped dispersion and drying trough (21); and a downwardly inclined guide pipe (28) is fixedly connected to the lower end of the funnel (27).

6. The biomass particle drying device according to claim 1, characterized in that: A first diamond gauze is provided at the connection between the hot air inlet pipe (16) and the rising tube (13); and a second diamond gauze is provided at the connection between the waste heat return pipe (17) and the rising tube (13).

7. A biomass pellet drying device according to any one of claims 1 to 6, characterized in that: The outer sides of the plurality of layers of the funnel-shaped dispersion and drying troughs (21) and the outer sides of the funnels (27) are wrapped with an outer ring tube (7); the outer wall of the outer ring tube (7) is fixedly connected with an air outlet pipe (71); the air outlet pipe (71) is located between the funnel (27) and the bottommost funnel-shaped dispersion and drying trough (21).

8. The biomass pellet drying device according to claim 7, characterized in that: A shielding cover (8) is fixed on the upper end surface of the funnel-shaped dispersion and drying trough (21) at the uppermost end; the shielding cover (8) is provided with a window (81) for inserting the discharge port (19).

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