Dryer blade structure and horizontal dryer

Abstract

The application discloses a scraper structure of a dryer, which comprises a scraper body and first and second supporting protrusions arranged on the scraper body. The structure is compact and ingenious. The scraper body is arranged between two adjacent dryer blades. One side of the scraper body is provided with a blade for cutting sludge in the dryer. The first and second supporting protrusions are arranged on both sides of the blade of the scraper body. The first supporting protrusion is arranged between the dryer blade on one side of the scraper body and the scraper body, and the second supporting protrusion is arranged between the dryer blade on the other side of the scraper body and the scraper body. Therefore, the blade of the scraper body is supported on both sides and adjacent dryer blades, so that the scraper is prevented from deforming, the scraper structure can stably run when high-viscosity materials are dried, long-period stable running of the sludge drying device is ensured, and the application is suitable for horizontal dryers. Meanwhile, the application provides a horizontal dryer comprising the scraper structure of the dryer.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of metallurgy, and relates to metallurgical sludge treatment, in particular to a dryer scraper structure and a horizontal dryer. BACKGROUND

[0002] In the metallurgical industry, a steel plant produces a large amount of production wastewater in the process of steelmaking and cold rolling, and a large amount of high-water-content and high-iron-content metallurgical sludge is finally obtained after the wastewater treatment is completed. Meanwhile, sufficient waste heat steam is obtained by recovering heat from tail gas of various furnaces in the metallurgical process, and the metallurgical sludge is dried by using the waste heat steam of the furnaces to reduce the water content of the metallurgical sludge and make the metallurgical sludge powderize to form particles, which are then sent to a sintering plant for recycling, thereby greatly reducing the recycling cost.

[0003] Therefore, the drying link is an important link in the process of recycling and utilizing the metallurgical sludge, and the scraper is mainly used for cutting the sludge between adjacent dryer blades to make the sludge separate from the dryer blades. Since the metallurgical sludge has a complex composition and high viscosity, the scraper of the horizontal single-shaft disc dryer is subjected to excessive force during the drying process, which causes the scraper to deform and is not conducive to long-time operation, thereby reducing the production cycle. Since the high-strength steel has a high cost, a low-cost scraper structure is needed to ensure long-term stable operation of the dryer. SUMMARY

[0004] The present application aims to provide a dryer scraper structure and a horizontal dryer to solve the problem of easy deformation of the existing scraper and the inability to realize long-cycle production.

[0005] To achieve the above-mentioned purpose, the present application provides the following solutions.

[0006] The present application provides a dryer scraper structure, comprising:

[0007] A scraper body is used for being installed between two adjacent dryer blades, and a blade edge is arranged on the scraper body to cut the sludge in the dryer; one end of the scraper body is used for being installed on the inner wall of the shell of the dryer;

[0008] A first supporting protrusion is arranged at the other end of the scraper body, and the first supporting protrusion is located between one of the two adjacent dryer blades and the scraper body;

[0009] A second supporting protrusion is arranged at the same end of the scraper body as the first supporting protrusion, and the second supporting protrusion is located between the other of the two adjacent dryer blades and the scraper body.

[0010] Optionally, the first support protrusion and the second support protrusion are two ends of a support rod, and the support rod is vertically arranged through the scraper body.

[0011] Optionally, the support rod is in a cylindrical shape or a quadrangular prism shape.

[0012] Optionally, the support rod is a non-metal support rod, and the support rod is detachably connected with the scraper body.

[0013] Optionally, the scraper body comprises a cutting section and a connecting section, one end of the connecting section is used for detachable connection with an inner wall of a housing of the dryer, the other end of the connecting section is connected with one end of the cutting section, and an obtuse angle is arranged between the connecting section and the cutting section, and the blade, the first support protrusion and the second support protrusion are arranged on the cutting section.

[0014] Optionally, the blade is arranged on one side of the cutting section close to the connecting section.

[0015] Optionally, the connecting section is fixed to the inner wall of the housing of the dryer by bolts.

[0016] Optionally, the scraper body is a carbon steel scraper body or a stainless steel scraper body.

[0017] Meanwhile, the application provides a horizontal dryer, which comprises a dryer housing, a dryer shaft arranged in the dryer housing and a plurality of dryer blades, one end of the dryer housing is provided with an inlet, and the other end is provided with an outlet; the plurality of dryer blades are arranged on the dryer shaft in the axial direction of the dryer shaft; and the dryer scraper structure as described above is arranged between any two adjacent dryer blades.

[0018] Optionally, the dryer shaft is a hollow dryer shaft, and both ends of the hollow dryer shaft are arranged through the dryer housing; and the hollow dryer shaft is used for circulation of drying steam.

[0019] Optionally, any one of the dryer blades is a disc type blade; and an edge of any one of the disc type blades is provided with a scraping plate, and the scraping plate is used for pushing and stirring sludge in the dryer housing.

[0020] Optionally, the dryer blade and the scraping plate are welded or bolted, and the included angle between the scraping plate and the dryer blade is 45°.

[0021] The application has the following technical effects relative to the prior art:

[0022] The scraper structure of the dryer has compact structure and ingenious design, is arranged between two adjacent dryer blades, one side of the scraper body is provided with a blade edge for cutting sludge in the dryer, meanwhile, first and second supporting protrusions are arranged on both sides of the blade edge of the scraper body, the first supporting protrusion is arranged between the dryer blade on one side of the scraper body and the scraper body, the second supporting protrusion is arranged between the dryer blade on the other side of the scraper body and the scraper body, so that the blade edges on both sides of the scraper body are supported between the adjacent dryer blades, the deformation of the scraper is avoided, the scraper structure can stably run when high-viscosity materials are dried, long-period stable running of the sludge drying device is ensured, and the scraper structure is suitable for the horizontal dryer.

[0023] Meanwhile, the horizontal dryer with the scraper structure of the dryer is provided, long-period stable running of sludge drying work can be ensured, and the horizontal dryer has high practicability. 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 following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0025] Figure 1 The structure diagram of the scraper structure of the dryer disclosed by the embodiments of the present application is shown in the figure.

[0026] Figure 2 The A-A sectional view of the scraper structure of the dryer disclosed by the embodiments of the present application is shown in the figure.

[0027] Figure 3 The installation diagram of the scraper structure of the dryer disclosed by the embodiments of the present application is shown in the figure.

[0028] Figure 4 The axial sectional view of the horizontal dryer disclosed by the embodiments of the present application is shown in the figure.

[0029] In the figure, the reference signs are as follows: 100, the scraper structure of the dryer; 200, the horizontal dryer.

[0030] 1, the scraper body; 11, the cutting section; 12, the connecting section.

[0031] 2, the blade edge.

[0032] 3, the first supporting protrusion.

[0033] 4, the second supporting protrusion.

[0034] 5, the supporting rod.

[0035] 6. Dryer shell; 61. Feed inlet; 62. Discharge outlet;

[0036] 7. Dryer shaft; 71. Steam inlet; 72. Steam outlet;

[0037] 8. Dryer blades;

[0038] 9. Material feeding plate. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] One of the objectives of this invention is to provide a dryer scraper structure to solve the problem of existing scrapers being easily deformed and unable to achieve long-cycle production.

[0041] Another object of the present invention is to provide a horizontal dryer having the above-described dryer scraper structure.

[0042] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] Example 1

[0044] like Figures 1-2As shown, this embodiment provides a dryer scraper structure 100, mainly including a scraper body 1, a first support protrusion 3, and a second support protrusion 4. The scraper body 1 is installed between two adjacent dryer blades 8. The scraper body 1 is generally in the shape of a thin plate or sheet, and the blade 2 is located on one side of the scraper body 1 to cut sludge (or other materials) inside the dryer. Hereinafter, the two ends of the scraper body 1 in the length direction are referred to as "one end" and "the other end," and the two sides in the thickness direction of the scraper body 1, i.e., the two sides of the blade 2, are referred to as "one side" and "the other side." One end of the scraper body 1 is installed on the inner wall of the dryer shell. The blade 2 is positioned in the opposite direction to the rolling direction of the sludge (or other materials) inside the dryer, so that the sludge (or other materials) moves towards the blade 2 during the drying process inside the dryer, thereby being cut by the blade 2. The first support protrusion 3 is located at the other end of the scraper body 1, and is situated between one of the two adjacent dryer blades 8 and the scraper body 1. The second support protrusion 4 is located at the same end of the scraper body 1 as the first support protrusion 3, and is situated between the other of the two adjacent dryer blades 8 and the scraper body 1. Based on this, supports are formed on both sides of the blade 2 of the scraper body 1 and between the adjacent dryer blades 8, preventing scraper deformation and ensuring stable operation of the scraper structure during the drying of high-viscosity materials, thus guaranteeing long-term stable operation of the sludge drying device.

[0045] In this embodiment, the first support protrusion 3 and the second support protrusion 4 can be either separate structures or an integral structure. Taking the first support protrusion 3 and the second support protrusion 4 as an integral structure as an example, the first support protrusion 3 and the second support protrusion 4 are respectively the two ends of a support rod 5. The support rod 5 is arranged perpendicular to the thickness direction of the scraper body 1 and penetrates through the scraper body 1, so that one end of the support rod 5 protruding from the scraper body 1 is the first support protrusion 3, and the other end protruding from the scraper body 1 is the second support protrusion 4. The first support protrusion 3 does not abut or connect with the adjacent dryer blade 8, but leaves a gap to avoid the first support protrusion 3 from causing wear on the dryer blade 8. The gap between the first support protrusion 3 and the adjacent dryer blade 8 is small enough that when the scraper body 1 has a tendency to deform toward the first support protrusion 3, the gap between the first support protrusion 3 and the adjacent dryer blade 8 determines the deformation range of the scraper body 1, and this deformation range is small enough or almost non-existent. Similarly, the second support protrusion 4 does not abut or connect with the adjacent dryer blade 8, but rather leaves a gap to prevent the second support protrusion 4 from causing wear on the dryer blade 8. The gap between the second support protrusion 4 and the adjacent dryer blade 8 is small enough that when the scraper body 1 tends to deform towards the second support protrusion 4, the gap between the second support protrusion 4 and the adjacent dryer blade 8 determines the deformation range of the scraper body 1, which is sufficiently small or virtually nonexistent. Therefore, the arrangement of the first support protrusion 3 and the second support protrusion 4 effectively prevents deformation of the scraper body 1.

[0046] In this embodiment, the support rod 5 is cylindrical or quadrangular prism in shape.

[0047] In this embodiment, the support rod 5 is a non-metallic support rod, such as a synthetic resin, and it is preferably detachably connected to the scraper body 1.

[0048] In this embodiment, the scraper body 1 includes a cutting section 11 and a connecting section 12 arranged sequentially along its length. One end of the connecting section 12 is detachably connected to the inner wall of the dryer housing, and the other end of the connecting section 12 is connected to one end of the cutting section 11. The connecting section 12 and the cutting section 11 are arranged at an obtuse angle. Figure 1 As shown, the blade 2, the first support protrusion 3, and the second support protrusion 4 are all disposed on the cutting section 11, and the blade 2 is located on the side of the cutting section 11 closer to the connecting section 12, that is, the blade 2 is the side of the aforementioned "obtuse angle".

[0049] In this embodiment, the connecting section 12 serves as the scraper seat of the scraper body 1 and can be fixed to the inner wall of the dryer housing by bolts.

[0050] In this embodiment, the scraper body 1 is preferably a carbon steel scraper body or a stainless steel scraper body.

[0051] This embodiment also proposes a horizontal dryer 200, including a dryer housing 6, a dryer shaft 7 disposed within the dryer housing 6, and a plurality of dryer blades 8. One end of the dryer housing 6 is provided with a feed inlet 61, and the other end is provided with a discharge outlet 62. The plurality of dryer blades 8 are arranged at intervals along the axial direction of the dryer shaft 7. It also includes a dryer scraper structure 100 as described above, and a dryer scraper structure 100 is provided between any two adjacent dryer blades 8.

[0052] In this embodiment, the horizontal dryer 200 can specifically be a horizontal single-shaft disc dryer, wherein the dryer shaft 7 is a hollow dryer shaft, and both ends of the hollow dryer shaft are disposed through the dryer shell 6; the hollow dryer shaft is used to circulate drying steam, which is the main heat source for drying sludge (or other materials), and can be derived from the heat recovery of tail gas from various furnaces and kilns in the metallurgical process. In the horizontal single-shaft disc dryer, any one of the dryer blades 8 is a disc-shaped blade, which is the main heating (contact) surface of the sludge (or other materials) inside the dryer shell 6. The scraper body 1 is used to cut the sludge between the two dryer blades 8, so that the sludge is separated from the dryer blades 8 and the turbulence of the sludge is increased. The support rod 5 is provided at the bottom end of the scraper body 1 (the end near the dryer shaft 7). During operation, the support rod 5 supports the scraper. The first support protrusion 3 and the second support protrusion 4 at both ends support the dryer blades 8 on both sides, so that this end of the scraper body 1 forms a two-point support. Combined with the top of the scraper body 1 connecting to the dryer shell 6 to form a fixed point, any scraper body 1 is supported by three points in the dryer. The overall force on the scraper is better than that of a single-point fixation at the top, so as to effectively prevent the scraper body 1 from deforming.

[0053] In this embodiment, the cutting segment 11 of the dryer scraper structure 100 is preferably arranged parallel to the radial direction of the aforementioned disc-shaped blade.

[0054] In this embodiment, the dryer shaft 7 is mainly used to support the sludge blades, i.e., the dryer blades 8, and its interior is also used for the input and output of steam and condensate.

[0055] In this embodiment, a lifting plate 9 is provided on the edge of any disc-shaped blade. The lifting plate 9 is used to propel and stir the sludge (or other materials) inside the dryer shell 6. The lifting plate 9 is preferably square in structure and is welded or bolted to the dryer blade 8, and the included angle between the lifting plate 9 and the dryer blade 8 is 45°.

[0056] The dryer housing 6 is cylindrical in shape. The dryer shaft 7 is installed inside the dryer housing 6 and arranged coaxially with it. The feed inlet 61 is located at one axial end of the dryer housing 6, and the discharge outlet 62 is located at the other axial end of the dryer housing 6. The material to be dried, such as high-moisture and high-iron metallurgical sludge, is fed into the dryer housing 6 through the feed inlet 61 and pushed towards the discharge outlet 62 by the lifting plates 9. During this process, furnace exhaust gas (high-temperature steam) is introduced into the dryer shaft 7. The material to be dried comes into contact with the dryer blades 8, achieving the drying process. At the same time, the dryer scraper structure 100 between any two connected dryer blades 8 cuts the material (sludge). Preferably, several dryer scraper structures 100 are evenly spaced along the axial direction of the dryer shaft 7. The dryer scraper structure 100 has a non-metallic rod (support rod 5) added to the bottom of the scraper. During operation, it can form two-point support with the dryer blades 8 on both sides of the scraper, which can stabilize the force and ensure that the scraper does not deform during long-term operation. At the same time, the scraper body 1 and the support rod 5 of the dryer scraper structure 100 are made of ordinary materials, which is low in cost. The support rod 5 and the scraper body 1 can be detached and connected by bolts or other means, which makes replacement convenient.

[0057] Meanwhile, the horizontal dryer 200 proposed in this embodiment, which includes the above-mentioned dryer scraper structure 100, can ensure long-term stable operation of sludge drying and is highly practical.

[0058] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0059] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A dryer scraper structure, characterized in that, include: The scraper body is used to be installed between two adjacent dryer blades. The scraper body is provided with a blade to cut the sludge inside the dryer. The scraper body includes a cutting section and a connecting section. One end of the connecting section is used to be detachably connected to the inner wall of the dryer shell. The other end of the connecting section is connected to one end of the cutting section. The connecting section and the cutting section are arranged at an obtuse angle. The blade is provided on the cutting section. A first support protrusion is disposed at the other end of the scraper body, and the first support protrusion is located between one of the two adjacent dryer blades and the scraper body. The second support protrusion and the first support protrusion are disposed at the same end of the scraper body, and the second support protrusion is located between the other of the two adjacent dryer blades and the scraper body. The first support protrusion and the second support protrusion are respectively the two ends of a support rod, which is vertically inserted through the scraper body. Both the first support protrusion and the second support protrusion are disposed on the cutting section. The support rod is a non-metallic support rod and is detachably connected to the scraper body.

2. The dryer scraper structure according to claim 1, characterized in that, The support rod is cylindrical or quadrangular.

3. The dryer scraper structure according to claim 1, characterized in that, The cutting edge is located on the side of the cutting section closest to the connecting section.

4. The dryer scraper structure according to any one of claims 1 to 3, characterized in that, The scraper body is a carbon steel scraper body or a stainless steel scraper body.

5. A horizontal dryer, comprising a dryer housing, a dryer shaft disposed within the dryer housing, and a plurality of dryer blades, wherein a feed inlet is provided at one end of the dryer housing and a discharge outlet is provided at the other end; the plurality of dryer blades are spaced apart along the axial direction of the dryer shaft, characterized in that, It also includes a dryer scraper structure as described in any one of claims 1 to 4, wherein the dryer scraper structure is disposed between any two adjacent dryer blades.

6. The horizontal dryer according to claim 5, characterized in that, The dryer shaft is a hollow dryer shaft, with both ends of the hollow dryer shaft penetrating the dryer housing; the hollow dryer shaft is used for the flow of drying steam.

7. The horizontal dryer according to claim 5, characterized in that, Any of the dryer blades are disc-shaped blades; each of the disc-shaped blades is provided with a lifting plate on its edge, the lifting plate being used for propulsion and stirring of sludge inside the dryer shell.

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