A lignin residue dosing system

Abstract

The application discloses a lignin residue feeding system, and belongs to the technical field of biomass feeding systems. The lignin residue feeding system comprises a stock bin, wherein the stock bin comprises a top plate provided with a feeding port, a front wall plate connected with the top plate, a left wall plate, a rear wall plate and a right wall plate; the side edges of the front wall plate, the left wall plate, the rear wall plate and the right wall plate are sequentially connected; the rear wall plate is rectangular, the rear wall plate is perpendicular to the horizontal plane, the left wall plate and the right wall plate are both right-angled trapezoids, the left wall plate and the right wall plate are both perpendicular to the rear wall plate, and the front wall plate is trapezoidal; the front wall plate is not perpendicular to other wall plates; a discharge port is formed in the bottom of the stock bin, the area of the discharge port in the bottom of the stock bin is greater than the area of the top plate; an activator is arranged at the bottom of the inner cavity of the stock bin; the activator comprises a cylindrical connecting body and a rotating piece arranged on the outer surface of the connecting body; the rotating piece is distributed on the side wall of the connecting body along the circumference of the connecting body; the rotating pieces which are adjacent in the axial direction of the connecting body are staggered; and a spiral conveying part is arranged at the discharge port of the stock bin and is used for conveying lignin residues to a target equipment.

Description

Technical Field

[0001] This invention belongs to the technical field of biomass feeding systems, and particularly relates to a feeding system for lignin residue. Background Technology

[0002] Lignocellulosic residue, as a straw residue produced in the cellulosic ethanol process, still has a certain calorific value and can be used for combustion and steam production in biomass boilers. Its viscosity is no greater than 100 CP (at 20 / 65℃); its pH range is 4.2–4.7; its moisture content is 45%–50% (w / w); and its bulk density after being broken into 20–50 mm pieces is 0.6–0.8 kg / L. According to its physical property analysis, it has a high viscosity, is acidic, and has a high bulk density. Therefore, it is prone to clogging conveying channels, acidic corrosion of contact equipment, and requires high bottom pressure during storage.

[0003] Lignocellulosic residue is the first biomass fuel produced industrially. Currently, there is no experience in using this type of fuel for transportation in any material conveying system. Therefore, it is particularly important to invent a material conveying system that can adapt to lignincellulosic residue, thereby playing a positive role in the promotion of cellulosic ethanol technology and providing guidance for material conveying in the field of lignincellulosic residue. Summary of the Invention

[0004] The purpose of this invention is to meet practical needs by providing a feeding system for lignin residue, which solves the problem of adhesion and blockage of lignin residue during intermediate buffering, and also solves the problem of acidic material corrosion in the long-term operation of the lignin residue conveying system.

[0005] To achieve the above-mentioned objectives, this invention provides a feeding system for lignin residue, including a silo. The silo is used for feeding and buffering lignin residue. The silo includes a top plate with an inlet, a front wall plate, a left wall plate, a rear wall plate, and a right wall plate connected to the top plate. The sides of the front wall plate, left wall plate, rear wall plate, and right wall plate are connected sequentially. The rear wall plate is rectangular and perpendicular to the horizontal plane. The left and right wall plates are both right-angled trapezoids and perpendicular to the rear wall plate. The front wall plate is trapezoidal. The front wall plate is not perpendicular to the other wall plates.

[0006] The bottom of the silo has a discharge port, and the area of ​​the discharge port at the bottom of the silo is larger than the area of ​​the top plate;

[0007] An activator is located at the bottom of the inner cavity of the silo; the activator includes a cylindrical connecting body and a rotating component disposed on the outer surface of the connecting body; the rotating component is distributed along the circumference of the connecting body on the side wall of the connecting body; adjacent rotating components are staggered along the axial direction of the connecting body; a spiral transfer part is provided at the discharge port of the silo to transfer lignin residue to the target equipment.

[0008] The activator at the bottom of the silo adopts the above structure, which increases the disturbance effect, prevents the material from arching and being compacted, and avoids the accumulation of material in the silo.

[0009] In the above-mentioned lignin residue feeding system, the spiral transfer unit includes: a primary spiral assembly disposed at the discharge port of the silo; the primary spiral assembly includes a first spiral component; a chute disposed at a position corresponding to the discharge port of the primary spiral assembly; and a secondary spiral assembly disposed at a position corresponding to the discharge port of the chute; wherein: the angle between the pipe direction of the chute and the vertical direction is 0-20°; the height of the inlet of the chute is greater than the height of the discharge port of the chute; the area of ​​the inlet of the chute is smaller than the area of ​​the discharge port; and the rotation direction of the first spiral component is perpendicular to the rear wall plate of the silo.

[0010] In the above-mentioned feeding system for lignin residue, the angle between the pipe direction of the chute and the vertical direction is 0 to 15°.

[0011] In this invention, the angle of the chute is controlled, and the material is transported smoothly in the chute during operation without any blockage.

[0012] In the above-mentioned lignin residue feeding system, a fire door is installed on the chute adjacent to the secondary spiral assembly. The fire door is a slide door, and a flexible connection is used between the chute and the secondary spiral assembly.

[0013] In the above-mentioned feeding system for lignin residue, the ratio of the height of the silo to the horizontal bottom length of the silo is 1.2 to 2.5, and the angle between the left or right wall of the silo and the horizontal plane is 75° to 90°; the ratio of the height of the silo to the longitudinal bottom length of the silo is 0.5 to 2.5, and the angle between the front wall of the silo and the horizontal plane is 65° to 85°.

[0014] In this invention, the silo wall panels are set with the specific angles and dimensions mentioned above, and are used in conjunction with the primary spiral assembly. Lignosulfite residue is not prone to blockage in the silo or at the angle between the silo wall and the bottom surface, and is not prone to blockage in the primary spiral silo. At the same time, during the forward conveying process of the primary spiral, material should not accumulate on the front wall panel due to the squeezing caused by the forward conveying of the spiral.

[0015] In the above-mentioned lignin residue feeding system, the silo wall thickness is 8-12mm, and the outer surface of the silo is provided with longitudinally and transversely staggered reinforcing flat steels, with a longitudinal or transverse spacing of 700mm-850mm between the reinforcing flat steels.

[0016] In the above-mentioned feeding system for lignin residue, the diameter of the connector is 500mm to 700mm, the length of the connector is no more than 5.5m, and the rotational speed of the connector during operation is 1m / s to 2m / s. At least four rotating parts are provided on each radial section of the connector. The number of rotating parts located on the same radial section is preferably an even number. The distance between the radial sections of adjacent rotating parts along the axial direction of the connector is 150mm to 250mm. The length of the rotating part is 80mm to 120mm.

[0017] In the above-mentioned feeding system for lignin residue, the number of rotating parts located on the same radial section of the connecting body is an even number.

[0018] In the above-mentioned feeding system for lignin residue, the lengths of adjacent rotating parts on the same radial section of the connecting body are different, while the lengths of two rotating parts that are one rotating part apart are the same; the length difference between adjacent rotating parts on the same radial section is 5mm to 30mm.

[0019] In the above-mentioned feeding system for lignin residue, the ratio of the area of ​​the inlet to the outlet of the chute is not less than 1:1.8; the thickness of the chute wall is 6-8 mm.

[0020] In the above-mentioned lignin residue feeding system, the primary spiral assembly further includes a first outer shell, which is used to receive the lignin residue discharged from the silo outlet. The first outer shell is provided with a high molecular weight polyethylene liner, the thickness of which is 10mm to 12mm.

[0021] In the above-mentioned feeding system for lignin residue, the secondary spiral assembly includes a second outer shell and a second spiral component. The second outer shell is provided with an NM400 wear-resistant steel liner, and the thickness of the NM400 wear-resistant steel liner is 10mm to 12mm.

[0022] In the above-mentioned lignin residue feeding system, the parts of the lignin residue feeding system that come into contact with the lignin residue are all coated with epoxy polyamide resin.

[0023] In the above-mentioned lignin residue feeding system, the epoxy polyamide resin coating is obtained by spraying, and the epoxy value of the epoxy polyamide resin coating is 0.30 to 0.34.

[0024] The beneficial effects of this invention are:

[0025] In this invention, the left, right and front walls of the silo are inclined, and rotating parts are provided in conjunction with the activator. The rotating parts are distributed on the side walls of the connecting body along the circumference and axial direction. The rotating parts on adjacent radial sections of the connecting body are staggered, which can not only bear the weight of the material in the height direction of the silo and reduce the pressure on the bottom feeding screw, but also increase the disturbance of the material, so that the lignin residue can flow smoothly in the silo.

[0026] In this invention, the angle of the front wall panel of the silo and the first-stage spiral assembly are matched to avoid repeated accumulation of materials near the front wall panel, so that the materials can be evenly distributed.

[0027] In this invention, an epoxy polyamide resin coating, which is wear-resistant and corrosion-resistant, is used, which makes the device stable even in high-temperature environments, and it is not easy to melt or corrode, thus greatly enhancing the durability of the device.

[0028] The installation of fire doors between the chute and the secondary spiral assembly facilitates the blocking of flames in the event of a fire in the secondary spiral assembly or other equipment, ensuring the safety of the silo and the primary spiral assembly.

[0029] In summary, this application effectively solves the problems of material accumulation and equipment durability, enabling materials to be smoothly transferred to other equipment. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This image shows a front view of a lignin residue feeding system provided in an embodiment of the present invention;

[0032] Figure 2 The image shows a right view of a lignin residue feeding system provided in an embodiment of the present invention;

[0033] Figure 3 A schematic diagram of the front wall panel of the silo provided in an embodiment of the present invention is shown;

[0034] Figure 4 A schematic diagram of the left wall panel of the silo provided in an embodiment of the present invention is shown;

[0035] Figure 5 A schematic diagram of the activator provided in an embodiment of the present invention is shown.

[0036] In the diagram, 1. hopper; 2. activator; 3. primary spiral assembly; 4. chute; 5. gate; 6. flexible connection; 7. secondary spiral assembly; 8. connector; 9. rotating component; 10. first outer shell; 11. first spiral component; 12. second outer shell; 13. second spiral component; 14. reinforcing flat steel. Detailed Implementation

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0039] All numerical designations, such as temperature, length, flow rate, and range, are approximate values. It's important to understand that while it's not always explicitly stated that all numerical designations are preceded by the term "approximately."

[0040] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] Please see Figures 1 to 5 ;

[0043] First Embodiment

[0044] This invention provides a feeding system for lignin residue, such as... Figure 1 and Figure 2 As shown, it includes the following:

[0045] The hopper 1 includes a bottom plate with a discharge port, a top plate with a feed port, and a front wall plate, a left wall plate, a rear wall plate, and a right wall plate connected to the bottom plate and the top plate. The sides of the front wall plate, left wall plate, rear wall plate, and right wall plate are connected sequentially. The rear wall plate is rectangular and perpendicular to the horizontal plane. The left and right wall plates are both right-angled trapezoids and perpendicular to the rear wall plate. The front wall plate is trapezoidal. The front wall plate is not perpendicular to the other wall plates. A discharge port is provided at the bottom of the hopper. The area of ​​the discharge port at the bottom of the hopper is larger than the area of ​​the top plate.

[0046] Preferably, the target equipment is a biomass boiler, that is, the feeding system transfers lignin residue into the biomass boiler;

[0047] like Figure 3 As shown, the front wall of silo 1 is directly opposite, and the sloping sides are the left and right wall panels; as shown... Figure 4 As shown, the left wall panel is directly opposite, and the inclined side on the right is the front wall panel; the inclined design of the left, right and front wall panels ensures the smooth transport of lignin residue in the silo.

[0048] Activator 2 is located at the bottom of the inner cavity of silo 1; such as Figure 5 As shown, the activator 2 includes a cylindrical connecting body 8 and a rotating component 9 disposed on the outer surface of the connecting body 8; the rotating components 9 are distributed along the circumference of the connecting body 8 on the side wall of the connecting body 8; adjacent rotating components 9 are staggered along the axial direction of the connecting body 8; the rotating components 9 can be configured as blades or stirring rods, etc., and are not specifically limited here.

[0049] For example, the position of the rotating part 9 is illustrated by the positional relationship of the hour hand at 0, 3, 6, and 9 o'clock on the clock face:

[0050] Viewed from the axial direction of the connecting body 8, the rotating parts 9 are arranged in the clockwise direction at the 0, 3, 6 and 9 o'clock positions. The rotating parts 9 at the 0 and 6 o'clock positions are arranged on the same radial section of the connecting body 8, while the rotating parts 9 at the 3 and 9 o'clock positions are arranged on another radial section, presenting a staggered arrangement.

[0051] A screw conveyor is set at the discharge port of silo 1 to transfer lignin residue to the target equipment.

[0052] Specifically, the spiral transfer unit includes:

[0053] A primary spiral assembly 3 is installed at the discharge port of the silo 1; the primary spiral assembly 3 includes a first spiral component 11; a chute 4 is installed at the corresponding position of the discharge port of the primary spiral assembly 3; and a secondary spiral assembly 7 is installed at the corresponding position of the discharge port of the chute 4.

[0054] The angle between the pipe direction of the chute 4 and the vertical direction is 0° to 20°, preferably 0° to 15°, such as 5°, 10° or 15°; the height of the inlet of the chute 4 is greater than the height of the outlet of the chute 4; the area of ​​the inlet of the chute 4 is smaller than the area of ​​the outlet.

[0055] It should be understood that the pipe direction of the chute 4 in this invention means that, taking a pipe with a polygonal cross-section as an example, the angle between each side wall and the vertical direction is less than 20°; taking a circular pipe as an example, the angle between its axis and the vertical direction is less than 20°.

[0056] The rotation direction of the first auger 11 is perpendicular to the rear wall of the hopper.

[0057] Second Embodiment

[0058] The feeding system based on the first embodiment operates as follows:

[0059] The lignin residue stored in silo 1 is changed from a compacted state at the bottom of the silo to a loose state by activator 2. The inclined design of the front wall, left wall and right wall of silo 1 and the setting of activator 2 effectively prevent the accumulation of materials in silo 1.

[0060] The lignin residue is discharged from the outlet of the silo 1 and enters the primary spiral assembly 3. Driven by the rotation of the first spiral component 11 in the primary spiral assembly 3, the material enters the secondary spiral assembly 7 through the inclined chute 4. The secondary spiral assembly 7 then conveys the material to the boiler and other equipment.

[0061] The angle of the front wall plate is matched with the size and direction of the first-stage spiral component 3 to achieve uniform material distribution. When the first-stage spiral component 3 rotates, it drives the lignin residue forward and also drives some material back into the hopper. At this time, the inclined setting of the front wall plate can play a certain role in squeezing the material downward, so that the material moves away from the front wall plate and is discharged from the outlet again, instead of continuously accumulating upward near the front wall plate. At this time, if the size of the first spiral component 11 is appropriate, it can drive the falling lignin residue to continue to be transported forward.

[0062] It should be noted that when the size of the first spiral component 11 is large, the included angle between the front wall plate and the bottom plate can be appropriately increased; conversely, the included angle between the front wall plate and the bottom plate needs to be reduced. That is, by changing the coordination between the front wall plate angle and the first-stage spiral, the material adhering to the front wall can be effectively carried to the rear through the first-stage spiral assembly.

[0063] Third Embodiment

[0064] Based on the first and second embodiments, the following are also included:

[0065] After numerous experiments, the following conclusions were reached:

[0066] If the ratio of the height of silo 1 to the horizontal bottom length of silo 1 is 1.2 to 2.5, and the angle between the left and right walls of silo 1 and the horizontal plane is 75° to 90°, then lignin residue is less likely to clog at the angles inside the silo.

[0067] If the ratio of the height of silo 1 to the longitudinal bottom length of silo is 0.5 to 2.5, the angle between the front wall and the horizontal plane is 65° to 85°. At this time, lignin residue is less likely to clog in the first-stage spiral assembly 3, and during the forward conveying process of the first-stage spiral assembly 3, it is less likely to accumulate material at the front wall due to the forward conveying of the spiral.

[0068] In this invention, the horizontal bottom refers to the bottom edge length between the left and right wall panels; the vertical bottom refers to the bottom edge length between the front and rear wall panels.

[0069] Preferably, in order to ensure that the silo 1 has a certain rigidity and economy, the wall thickness of the silo is controlled within the range of 8mm to 12mm, such as 8mm, 10mm or 12mm; and longitudinal and transverse staggered reinforcing flat steel 14 are provided on the outer surface of the silo 1, with the longitudinal or transverse spacing between the reinforcing flat steel 14 being 700mm to 850mm, such as 750mm or 800mm.

[0070] An activator 2 is installed inside the silo 1. The activator 2 can bear the weight of the material in the height direction of the silo, and at the same time, it can reduce the pressure of the bottom of the silo 1 on the first-stage spiral assembly 3 of the feed, increase the disturbance of the material, and make the lignin residue flow smoothly in the silo 1.

[0071] Through experimental verification, when the diameter of the connecting body 8 of the activator 2 is set to 500-700mm, such as 500mm, 600mm or 700mm, the length of the connecting body 8 is controlled within 5.5m, such as 4.5m or 5m, and the rotation speed during operation is controlled at 1-2m / s, the activator 2 can stably carry the lignin residue in the silo 1, and at the same time continuously and stably convey the lignin residue to the first-stage spiral assembly 3.

[0072] If the diameter of activator 2 is too small, the number of units that need to be arranged will increase; if it is too large, material will easily accumulate on the surface of activator 2.

[0073] Preferably, such as Figure 5As shown, the number of rotating parts 9 located on the same radial section of the connecting body 8 is preferably an even number; the minimum distance between the radial sections of adjacent rotating parts 9 along the axial direction of the connecting body 8 is 150mm to 250mm, such as 150mm or 200mm, etc. If the distance is too large, it will not have a disturbance effect, and if the distance is too small, it will cause the activator 2 to idle; for example, still using the position of the aforementioned clock face as an example, if there are 4 rotating parts 9 located on the same radial section of the connecting body 8, corresponding to the positions of the hour hand at 0 o'clock, 3 o'clock, 6 o'clock, and 9 o'clock respectively, then the spacing between adjacent rotating parts 9 at the same position, such as adjacent rotating parts 9 in the 3 o'clock direction, needs to be controlled between 300 and 500mm;

[0074] Based on the small particle size of lignin residue, such as loose materials, the length of the rotating part 9 should be in the range of 80mm to 120mm, such as 90mm, 100mm or 110mm. Preferably, the extension length of the rotating parts 9 in the same radial section is set differently, that is, adjacent rotating parts 9 in the same section are set with different extension lengths, and the lengths of two rotating parts 9 that are one rotating part apart are the same.

[0075] The rotating body 8 rotates, thereby driving the rotating component 9 to rotate. The rotating component 9 then acts like a stirrer, thereby increasing the disturbance of the material and preventing arching. The length difference between adjacent rotating components 9 on the same radial section of the connecting body 8 is preferably 5mm to 30mm. For example, the rotating components 9 in the 0-point and 6-point directions are differentiated from those in the 3-point and 9-point directions, with a length difference of 10mm, 20mm, or 30mm, etc.

[0076] The first outer shell 10 of the primary spiral assembly 3 is used to receive the lignin residue discharged from the outlet of the silo 1. It is equipped with a high molecular weight polyethylene lining. Preferably, the lining thickness is 10-12mm, which can effectively prevent wear, reduce operating noise, and increase service life.

[0077] It should be noted that the number of first-stage spiral components 3 is set according to actual needs, and no specific limit is made here.

[0078] The function of the chute 4 is to connect the primary spiral assembly 3 and the secondary spiral assembly 7. The chute 4 also adopts a shape that is smaller at the top and larger at the bottom. The area ratio of the inlet and outlet of the chute 4 is controlled to be no less than 1:1.8, such as 1:1.7, 1:1.6 or 1:1.5. The greater the difference in area between the two, the easier it is for the outlet to be blocked. Preferably, the thickness of the wall of the chute 4 is between 6 and 8 mm.

[0079] Since the secondary spiral assembly 7 is close to the boiler, it will be in direct contact with the high-temperature flue gas and the working environment temperature is relatively high, about 780°C. The secondary spiral assembly 7 includes a second outer shell 12 and a second spiral component 13. Preferably, the second outer shell 12 is provided with an NM400 wear-resistant steel liner with a thickness of 10-12mm, which can reduce friction loss while resisting high temperature.

[0080] Similarly, the number of secondary spiral components 7 should be set according to actual needs to achieve the purpose of smooth material conveying.

[0081] In addition, the connection between the chute 4 and the secondary spiral assembly 7 is a flexible connection 6; and a fire door is provided at the connection, which is in the form of a plug-in plate 5; in the event of a fire in the secondary spiral assembly 7, closing the fire door can isolate the flames in time and ensure the safety of the primary spiral assembly and the silo; since the primary spiral assembly and the silo are too close, it is difficult not to affect the silo if the primary spiral assembly catches fire, so the installation of the secondary spiral assembly 7 is very necessary.

[0082] Furthermore, since lignin residue is acidic and highly corrodes equipment, the contact areas between the equipment and the acidic lignin residue are coated with epoxy polyamide resin. The epoxy value is between 0.30 and 0.34, the organic chlorine content is less than 0.02%, and the inorganic chlorine content is less than 0.005%. Specifically, the relevant process flow from beginning to end includes:

[0083] (1) Surface preparation: Clean the surface of the equipment;

[0084] (2) Sandblasting and rust removal: Use a professional sandblasting machine to remove dirt, rust and other contaminants from the surface to ensure the adhesion of the paint layer;

[0085] (3) Mixing the paint: Mix the paint according to the proportions;

[0086] (4) Apply primer: Apply primer, i.e. epoxy polyamide resin coating, to the surface to be coated to protect the surface.

[0087] (5) Curing: After the primer dries, the coating should be cured to avoid scratching with hard objects and to ensure the integrity of the coating.

[0088] Corrosion resistance should be reflected in all aspects of the operation process. For example, dust prevention and environmental protection should be taken into account during construction, and the ambient temperature and humidity should be monitored daily. Construction should not be carried out when the metal surface temperature is 3°C above the dew point, and construction should not be carried out on rainy days. After sandblasting and rust removal, the surface cleanliness of the metal structure should reach Sa2.5, the surface roughness of the metal structure should reach 40-75 μm, and the thickness of the epoxy polyamide resin coating should reach 0.4-0.7 mm.

[0089] Fourth embodiment

[0090] Based on the feeding system of the first, second, and third embodiments, the ratio of the height of the hopper 1 to its horizontal bottom length is set to 2, and the angles between the left and right walls of the hopper 1 and the horizontal plane are both 80°; the ratio of the height of the hopper 1 to its longitudinal bottom length is set to 1.5, and the angle between the front wall and the horizontal plane is 70°; the diameter of the connecting body 8 of the activator 2 is set to 600mm, and the length of the connecting body 8 is set to 4m; the number of rotating parts 9 located on the same radial section of the connecting body 8 is set to 4, and the length of the rotating parts 9 extends to 80mm; the area ratio of the inlet and outlet of the chute 4 is set to 1:1.8, etc.; there are other parameter settings, which will not be listed here.

[0091] 30,000 tons of cellulosic ethanol will be produced by feeding the system with the above parameters into the feed system of the 45t / h high-temperature and high-pressure CFB boiler of the biomass power plant. The feeding capacity of the lignin residue in the feed system of this application is 12t / h, with a maximum of 13.2t / h, and the capacity of the silo is set at 60m³. 3 .

[0092] During the operation of the feeding system, the boiler produces 45 t / h of steam with steam parameters of 9.8 MPa and 540℃.

[0093] The feeding system operated stably for one year, with stable boiler load, achieving long-term stable production. No blockages, wear, or corrosion were observed in the feeding system.

[0094] Example for comparison:

[0095] The original feeding system of the control example did not have an activator, the top plate area of ​​the silo was smaller than the outlet area, and the wall was a trapezoidal structure. Using it for feeding lignin residue would easily cause blockage in the silo. In addition, the original system was not coated with epoxy polyamide resin, which would easily cause corrosion and wear of the conveying system.

[0096] This invention effectively solves the problems of material accumulation and equipment durability, allowing lignin residue to be smoothly conveyed into the boiler. Using the feeding system described in this invention, the system has been running stably for a year without any blockage, wear, or corrosion.

[0097] The above description is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A feeding system for lignin residue, characterized in that, include: The silo (1) includes a top plate with a feed inlet, a front wall plate, a left wall plate, a rear wall plate, and a right wall plate connected to the top plate; the sides of the front wall plate, left wall plate, rear wall plate, and right wall plate are connected in sequence; the rear wall plate is quadrilateral and perpendicular to the horizontal plane; the left wall plate and the right wall plate are both right trapezoids and perpendicular to the rear wall plate; the front wall plate is trapezoidal; the front wall plate is not perpendicular to the other wall plates; the bottom of the silo has a discharge port, and the area of ​​the discharge port at the bottom of the silo is larger than the area of ​​the top plate; An activator (2) is located at the bottom of the inner cavity of the hopper (1); the activator (2) includes a cylindrical connecting body (8) and a rotating component (9) disposed on the outer surface of the connecting body (8); the rotating component (9) is distributed along the circumference of the connecting body (8) on the side wall of the connecting body (8); adjacent rotating components (9) along the axial direction of the connecting body (8) are arranged in an alternating manner; The screw conveyor is set at the discharge port of the silo (1) to transfer lignin residue to the target equipment. The ratio of the height of the silo (1) to the horizontal bottom length of the silo (1) is 1.2 to 2.5, and the angle between the left or right wall of the silo (1) and the horizontal plane is 75° to 90°. The ratio of the height of the silo (1) to the longitudinal bottom length of the silo (1) is 0.5 to 2.5, and the angle between the front wall of the silo (1) and the horizontal plane is 65° to 85°. The lateral bottom length is the bottom edge length between the left and right wall panels, and the longitudinal bottom length is the bottom edge length between the front and rear wall panels.

2. The lignin residue feeding system according to claim 1, characterized in that, The spiral transfer unit includes: A primary spiral assembly (3) is installed at the discharge port of the silo (1); the primary spiral assembly (3) includes a first spiral component (11); The chute (4) is installed at the corresponding position of the discharge port of the first-stage spiral assembly (3); and a secondary spiral assembly (7) disposed at the corresponding position of the discharge port of the chute (4); wherein: The angle between the pipe direction and the vertical direction of the chute (4) is 0 to 20°; the height of the inlet of the chute (4) is greater than the height of the outlet of the chute; the area of ​​the inlet of the chute (4) is smaller than the area of ​​the outlet. The rotation direction of the first spiral component (11) is perpendicular to the rear wall of the hopper.

3. The lignin residue feeding system according to claim 2, characterized in that, The angle between the pipe direction of the chute (4) and the vertical direction is 0 to 15°.

4. The lignin residue feeding system according to claim 2, characterized in that, A fire door is provided on the chute (4) at a position adjacent to the secondary spiral assembly (7). The fire door is a slide door (5), and a flexible connection (6) is used between the chute and the secondary spiral assembly.

5. The lignin residue feeding system according to claim 1, characterized in that, The silo (1) has a wall thickness of 8-12 mm. The outer surface of the silo (1) is provided with longitudinally and transversely arranged reinforcing flat steel (14), and the longitudinal or transverse spacing between the reinforcing flat steel (14) is 700-850 mm.

6. The lignin residue feeding system according to claim 1, characterized in that, The diameter of the connector (8) is 500-700mm, the length of the connector (8) is no more than 5.5m, and the rotational speed of the connector (8) during operation is 1m / s-2m / s; At least four rotating parts (9) are provided on each radial section of the connector (8); the distance between the radial sections where the rotating parts (9) are adjacent along the axial direction of the connector (8) is 150mm to 250mm; the length of the rotating parts (9) is 80mm to 120mm.

7. The lignin residue feeding system according to claim 6, characterized in that, The number of rotating parts (9) located on the same radial section of the connecting body (8) is an even number.

8. The lignin residue feeding system according to claim 7, characterized in that, The lengths of adjacent rotating parts (9) on the same radial section of the connecting body (8) are different, and the lengths of two rotating parts (9) that are one rotating part (9) apart are the same; the length difference of adjacent rotating parts (9) on the same radial section of the connecting body (8) is 5mm to 30mm.

9. The lignin residue feeding system according to claim 2, characterized in that, The ratio of the area of ​​the inlet to the outlet of the chute (4) is not less than 1:1.8; the thickness of the wall of the chute (4) is 6mm to 8mm.

10. The lignin residue feeding system according to claim 2, characterized in that, The primary spiral assembly (3) also Includes a first outer shell (10), which is used to receive lignin residue discharged from the silo outlet; The first outer shell (10) is provided with a high molecular weight polyethylene liner, the thickness of which is 10mm to 12mm.

11. The lignin residue feeding system according to claim 2, characterized in that, The secondary helical assembly includes The second outer shell (12) and the second spiral component (13) are provided with an NM400 wear-resistant steel liner; the thickness of the NM400 wear-resistant steel liner is 10mm to 12mm.

12. The lignin residue feeding system according to any one of claims 1-11, characterized in that, The parts of the lignin residue feeding system that come into contact with the lignin residue are all coated with epoxy polyamide resin.

13. The lignin residue feeding system according to claim 12, characterized in that, The epoxy polyamide resin coating is obtained by spraying, and the epoxy value of the epoxy polyamide resin coating is 0.30 to 0.34.

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