Drying and granulating machine

Abstract

The present invention relates to a drying and granulating machine, comprising: a housing, having a cylindrical shape, the housing having an inner wall and an outer wall spaced apart in the radial direction so as to define a heating space for accommodating a heating medium; and a rotor, the rotor comprising a plurality of blades protruding radially outward on the outer surface of the rotor. The plurality of blades include: a first blade, the shape of the first blade being designed to smear sludge on the inner surface of the inner wall facing the rotor; a second blade, the shape of the second blade being designed to promote mixing of sludge having different viscosities; a third blade, the shape of the third blade being designed to scrape off the dried sludge from the inner surface of the inner wall, so that the dried sludge falls off, and granulation of the sludge is promoted; and a fourth blade, the shape of the fourth blade being designed to bring the granulated sludge into contact with the inner surface of the inner wall, so that the granulated sludge is further dried, and the granularity of the granulated sludge is controlled to a set size and form.

Description

Drying granulator

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese application CN202311234815.1 filed with the State Intellectual Property Office of China on September 22, 2023. Technical Field

[0003] The invention relates to a drying granulator. Background Art

[0004] According to the "Urban and Rural Construction Statistical Yearbook" released by the Ministry of Housing and Urban-Rural Development, the national production of dry sludge reached 16.2179 million tons in 2021. Converted to dewatered sludge with an 80% moisture content at sewage treatment plants, the annual output reached 81.09 million tons. Proper sludge treatment and disposal is a top priority after sewage treatment. Before final disposal or resource utilization (such as incineration, carbonization, gasification, and building material utilization), the moisture content of dewatered sludge generally needs to be reduced to below 40%. Drying is the main technical route to achieve this goal and is therefore a key intermediate link in the entire sludge treatment and disposal chain. To facilitate sludge disposal and resource utilization, in addition to reducing the sludge moisture content, it is often necessary to granulate the dried product. For example, granulating powdered dried sludge to produce a product of a specific shape and particle size for easy transportation, storage, and disposal. Therefore, granulation equipment is usually installed after the drying unit. Granulation is generally a high-energy and safety-related process, which not only increases investment but also brings operational difficulties. If simultaneous granulation is completed during the drying process, significant technical advantages can be achieved.

[0005] Summary of the Invention

[0006] In order to overcome the above problems, the present invention provides a drying granulator, comprising: a shell having a cylindrical shape, the shell having an inner wall and an outer wall spaced apart in the radial direction, thereby defining a heating space for accommodating a heating medium; a feed port located at one end of the shell for receiving sludge and communicating with the interior of the shell; a discharge port located at the other end of the shell opposite to the one end and communicating with the interior of the shell for discharging treated sludge; a rotor disposed inside the shell and extending coaxially with the shell, the rotor comprising a plurality of blades protruding radially outward on its outer surface, the plurality of blades comprising: a first blade spirally disposed on the outer surface of the rotor in a first section along the length of the rotor, the first section being adjacent to the feed port, the first blade being shaped so as to smear the sludge on the inner surface of the inner wall facing the rotor on; a second blade is spirally arranged on the outer surface of the rotor along the first section of the length of the rotor, the second blade is spaced apart from the first blade, and the shape of the second blade is designed to promote the mixing of sludges of different viscosities; a third blade is spirally arranged on the outer surface of the rotor along the second section of the length of the rotor, the second section is continuous with the first section, and the shape of the third blade is designed to scrape the dried sludge off the inner surface of the inner wall, causing it to fall off, thereby promoting the granulation of the sludge; a fourth blade is spirally arranged on the outer surface of the rotor along the second section of the length of the rotor, the fourth blade is spaced apart from the third blade, and the shape of the fourth blade is designed to bring the granulated sludge into contact with the inner surface of the inner wall, so that the granulated sludge is further dried and the particle size of the granulated sludge is controlled to a set size and shape.

[0007] Advantageously, the first blade includes a first base plate and a twisted blade and a bent blade arranged on opposite sides of the first base plate, the first base plate is arranged on the outer surface of the rotor, and the twisted blade and the bent blade are spaced apart from the inner surface of the inner wall.

[0008] The twisting blade is twisted at a predetermined angle relative to the base plate, and the bending blade is obliquely bent at a predetermined angle relative to the base plate, so that during the rotation of the rotor, the twisting blade pushes the sludge toward the bending blade, and the bending blade smears the sludge on the inner surface of the inner wall.

[0009] Advantageously, the second blade includes a second substrate and a first twisted blade and a second twisted blade arranged on opposite sides of the second substrate, the second substrate being arranged on an outer surface of the rotor, the first twisted blade being twisted relative to the second substrate by a first angle, the second twisted blade being twisted relative to the second substrate by a second angle, the first angle being greater than the second angle.

[0010] The first twisting blade is designed to propel the sludge with increasing viscosity, and the second twisting blade is designed to propel the sludge with decreasing viscosity, thereby promoting mixing of the two sludges with different viscosities.

[0011] Advantageously, the third blade includes a third substrate and a third twisted blade and a straight blade arranged on opposite sides of the third substrate. The third substrate is arranged on the outer surface of the rotor. The third twisted blade is twisted at a predetermined angle relative to the third substrate.

[0012] The third twisted blades push the dried sludge toward the straight blades, so that the straight blades scrape the dried sludge off the inner surface of the inner wall, causing it to fall off, thereby promoting granulation of the dried sludge.

[0013] Advantageously, the fourth blade includes a fourth substrate and a first bent blade and a second bent blade arranged on opposite sides of the fourth substrate. The fourth substrate is arranged on the outer surface of the rotor, the first bent blade is bent at a first angle relative to the fourth substrate, and the second bent blade is bent at a second angle relative to the fourth substrate. The top of the inner surface of the first bent blade and / or the second bent blade facing the inner wall is provided with serrations. The first bent blade and the second bent blade are designed to promote contact between the granulated sludge and the inner surface of the inner wall, so that the granulated sludge is further dried, and the particle size of the granulated sludge is controlled to a set size and shape through the serrations to obtain shaped granulated sludge.

[0014] Advantageously, the housing comprises a plurality of sections, and the dry granulator comprises a heating pipeline respectively connected to each of the plurality of sections, so as to supply heating medium to the heating space of each section.

[0015] Advantageously, the parameters of the heating medium supplied by the heating pipe to the multiple sections are different from each other.

[0016] Advantageously, the dry granulator includes a driving system, which includes: a driving motor; and a speed reducer coupled to the driving motor and the rotor, so as to transmit the driving force of the driving motor to the rotor to rotate the rotor.

[0017] Advantageously, the dry granulator further comprises a cooling system and a grease injector. The cooling system is connected to the reducer for providing cooling for the drive system, and the grease injector is used to provide grease for bearings of the dry granulator.

[0018] Advantageously, the drying and granulation machine also includes a thermal imaging camera device installed on the shell, which is used to monitor the temperature of the inner wall of the drying and granulation machine and the sludge forming condition in real time, adjust the blade arrangement and optimize the distribution of the thin mud layer based on the monitoring results, or automatically adjust the parameters of the heating medium to improve the efficiency of drying and granulation. The thermal imaging camera device includes: a mounting bracket installed on the shell, and the camera is installed on the mounting bracket; a glass observation panel installed on the shell, and the camera is installed to be aligned with the glass observation panel so that the interior of the shell can be monitored through the glass observation panel.

[0019] Advantageously, the thermal imaging device comprises: a flushing water filling port; and a nozzle connected to the flushing water filling port and directed toward the glass viewing plate, such that the nozzle receives the flushing water and sprays the flushing water toward the glass viewing plate.

[0020] Advantageously, the drying granulator further comprises a moisture measuring device arranged near the discharge port, which can collect sludge samples from the drying granulator in real time, perform moisture detection, and automatically adjust the parameters of the heating medium according to the monitoring results to ensure efficient drying and granulation.

[0021] Advantageously, the drying granulator further comprises an axial displacement type spherical roller bearing, which is sleeved in the bearing box flange and comprises: an outer ring; a spherical transition ring, which is arranged on the inner side of the outer ring; an inner ring, which is arranged on the inner side of the spherical filter ring and is configured to be able to be displaced in the axial direction; and a cylindrical roller, which is arranged between the spherical filter ring and the inner ring and is retained by a roller retainer.

[0022] Advantageously, a plurality of ribs extending in the axial direction and spaced apart in the circumferential direction are provided on the outer surface of the rotor, and the blades are mounted on the plurality of ribs, and the plurality of ribs include first ribs and second ribs different from each other, and the first ribs and the second ribs are staggered with each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other features and advantages of exemplary embodiments of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, which are intended for illustrative purposes only and are not intended to limit the scope of the present invention in any way, wherein:

[0024] FIG1 shows a front view of a dry granulator according to the present invention.

[0025] FIG2 shows a left side view of the drying granulator according to the present invention.

[0026] FIG3 shows a right side view of the drying granulator according to the present invention.

[0027] FIG4 shows a front view of a rotor of a dry granulator according to the present invention.

[0028] FIG5 shows a left side view of the rotor.

[0029] FIG6 shows a front view of a first rib of the rotor.

[0030] FIG7 shows a front view of the second rib of the rotor.

[0031] Figure 8 shows a tiled view of the rotor, illustrating the various blade arrangements.

[0032] 9a-9c show a front view and a cross-sectional view of the first blade.

[0033] FIG10 shows an end view of a first blade.

[0034] 11a to 11c show a front view and a cross-sectional view of the second blade.

[0035] FIG12 shows an end view of the second blade.

[0036] 13a to 13c show a front view and a cross-sectional view of the third blade.

[0037] FIG14 shows an end view of the third blade.

[0038] 15a to 15c show a front view and a cross-sectional view of the fourth blade.

[0039] FIG16 shows an end view of the fourth blade.

[0040] FIG17 shows a schematic diagram of a thermal imaging camera device.

[0041] FIG18 is a schematic diagram showing a moisture measurement device.

[0042] FIG19 shows a schematic diagram of an axial displacement type spherical roller bearing. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the technical solution of the present disclosure clearer, the technical solution of the embodiment of the present disclosure will be clearly and completely described below in conjunction with the drawings of the specific embodiments of the present disclosure. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0044] Compared to the embodiments shown in the drawings, feasible embodiments within the scope of protection of the present disclosure may have fewer components, additional components not shown in the drawings, different components, differently arranged components, or differently connected components, etc. In addition, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0045] Unless otherwise defined, technical or scientific terms used herein should have the ordinary meaning understood by a person of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar expressions used in the patent specification and claims of this disclosure do not denote any order, quantity, or importance, but are merely used to distinguish different components. When the number of components is not specified, the number of components may be one or more; similarly, terms such as "a," "the," and "said" do not necessarily indicate a quantitative limitation. Terms such as "include" or "comprising" mean that the element or object preceding the term includes the elements or objects listed after the term, and their equivalents, but do not exclude other elements or objects. Terms such as "installed," "disposed," "connected," and "connected" are not limited to physical or mechanical installation, disposition, or connection, but may include electrical installation, disposition, or connection, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative orientations of devices during use or as shown in the accompanying drawings. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0046] The dewatered sludge from the sewage treatment plant shows the following state evolution during the thermal drying process: the initial state is paste or cake-like, and it is difficult to flow. After heating, the fluidity increases and it is easy to spread on the metal surface. The evaporation rate is high at this stage; after losing some water, the adhesion gradually increases, the internal cohesion increases, and the fluidity is poor until it reaches a peak. The viscosity peak area is the area with the lowest sludge drying efficiency, because the strong internal cohesion at this time makes the efficiency of material transfer and heat transfer particularly poor; after further water loss, the viscosity decreases, and it begins to split, condense, and granulate. The evaporation rate is low at this stage; further, the particles gradually break up and granulate as the water continues to be removed, and the viscosity disappears.

[0047] The drying granulator of the present application is adapting to the above-mentioned changes in the sludge drying process, and realizes synchronous granulation during the drying process.

[0048] FIG1 shows a front view of a drying granulator according to the present invention. FIG2 shows a left view of the drying granulator according to the present invention. FIG3 shows a right view of the drying granulator according to the present invention. The drying granulator includes a housing 1 having a cylindrical shape. The housing 1 has an inner wall and an outer wall. Although not shown in the figure, the inner wall and the outer wall are spaced apart in the radial direction to define a heating space. During operation, the heating space is capable of receiving a heating medium, so that the heating medium heats the sludge attached to the inner surface of the inner wall via the inner wall. The contact area between the inner wall of the stator and the sludge is made of composite steel plate or spray material.

[0049] The feed port 12 is provided at one end of the housing and communicates with the interior of the housing so that sludge can enter the interior of the housing through the feed port. The discharge port 13 is located at the other end of the housing opposite to the one end and communicates with the interior of the housing for discharging the treated sludge.

[0050] The rotor 2 is disposed within the housing and extends coaxially therewith. The rotor includes a plurality of blades protruding radially outward from its outer surface. As shown in FIG8 , the plurality of blades specifically include a first blade 21, a second blade 22, a third blade 23, and a fourth blade 24. The first blade 21 and the second blade 22 are primarily disposed on the first section of the rotor, while the third blade 23 and the fourth blade 24 are primarily disposed on the second section of the rotor. The first section includes a distribution area S1 and a drying area S2. In the distribution area, sludge is primarily applied to the inner surface of the inner wall facing the rotor. In the drying area, the sludge is primarily dried. The second section includes a granulation area S3 and a shaping area S4. In the granulation area, the dried sludge is primarily granulated to form sludge of varying particle sizes. In the shaping area, the dried sludge is shaped to control the varying particle sizes to a consistent particle size.

[0051] The first blades 21 are spirally arranged on the outer surface of the rotor along a first section of the length of the rotor, the first section being adjacent to the feed inlet, and are shaped so as to smear the sludge on the inner surface of the inner wall facing the rotor.

[0052] As shown in Figures 9a-9c and 10, Figure 9a is a cross-sectional view taken along line AA in Figure 9b, and Figure 9c is a cross-sectional view taken along line BB in Figure 9b. The first blade 21 comprises a first base plate 211 and twisting blades 212 and bending blades 213 disposed on opposite sides of the first base plate. The first base plate 211 is disposed on the outer surface of the rotor, and the twisting blades 212 and bending blades 213 are spaced apart from the inner surface of the inner wall. The twisting blades 212 are twisted at a predetermined angle α relative to the first base plate 211, and the bending blades 213 are obliquely bent at a predetermined angle β relative to the first base plate 211. During rotor rotation, the twisting blades propel sludge toward the bending blades, which smear the sludge on the inner surface of the inner wall, forming a thin sludge layer that is rapidly heated by the inner wall. As shown in Figure 9b, the bending blades 213 are tilted at an angle φ relative to the first base plate 211. These angles α, β, and φ can be adjusted based on the characteristics of the sludge.

[0053] Second blades 22 are helically disposed on the outer surface of the rotor along a first section of its length, the second blades being spaced apart from the first blades and having a shape designed to promote mixing of sludges of different viscosities.

[0054] As shown in Figures 11a-11c and 12 (Figure 11a is a cross-sectional view taken along line AA in Figure 11b, and Figure 11c is a cross-sectional view taken along line BB in Figure 11b), the second blade 22 includes a second base plate 221 and first and second twisted blades 222 and 223 disposed on opposite sides of the second base plate. The second base plate 221 is disposed on the outer surface of the rotor. The first twisted blade 222 is twisted relative to the second base plate by a first angle α, and the second twisted blade 223 is twisted relative to the second base plate by a second angle β, with the first angle being greater than the second angle. These angles α and β can be adjusted based on sludge characteristics.

[0055] The first twisting blade 222 is suitable for pushing sludge with increasing viscosity or poor fluidity, and the second twisting blade 223 is suitable for pushing sludge with decreasing viscosity or good fluidity, promoting the mixing of sludge in the two states, shortening the time for the sludge to cross the viscosity peak area, and improving drying efficiency.

[0056] The third blades 23 are spirally arranged on the outer surface of the rotor along a second section of the length of the rotor, which second section is continuous with the first section. The shape of the third blades is designed to scrape the dried sludge off the inner surface of the inner wall, causing it to fall off and promote granulation of the sludge.

[0057] As shown in Figures 13a-13c and 14, Figure 13a is a cross-sectional view taken along line AA in Figure 13b, and Figure 13c is a cross-sectional view taken along line BB in Figure 13b. The third blade includes a third base plate 231 and third twisted blades 232 and straight blades 233 disposed on opposite sides of the third base plate. The third base plate 231 is disposed on the outer surface of the rotor, and the third twisted blades 232 are twisted relative to the third base plate by a predetermined angle α. This angle α can be adjusted according to the characteristics of the sludge.

[0058] The third twisted blades push the dried sludge with low viscosity to move to the working area of ​​the straight blades, so that the straight blades scrape the dried sludge off the inner surface of the inner wall, causing it to fall off, thereby promoting the granulation of the dried sludge.

[0059] The fourth blade 24 is spirally arranged on the outer surface of the rotor along the second section of the length of the rotor. The fourth blade is spaced apart from the third blade. The shape of the fourth blade is designed to make the granulated sludge contact the inner surface of the inner wall, so as to further dry the granulated sludge and control the particle size of the granulated sludge to a set size and shape.

[0060] As shown in Figures 15a-15c and 16, Figure 15a is a cross-sectional view taken along line AA of Figure 15b, and Figure 15c is a cross-sectional view taken along line BB of Figure 15b. The fourth blade 24 includes a fourth substrate 241 and a first bent blade 242 and a second bent blade 243 arranged on opposite sides of the fourth substrate. The fourth substrate 241 is arranged on the outer surface of the rotor, the first bent blade 242 is bent at a first angle α relative to the fourth substrate 241, and the second bent blade 243 is bent at a second angle β relative to the fourth substrate. The top end of the inner surface of the first bent blade and / or the second bent blade facing the inner wall is provided with serrations. Preferably, the top end of the inner surface of the second bent blade facing the inner wall is provided with serrations 244.

[0061] The first curved blade and the second curved blade are designed to act on sludge of different particle sizes, causing the granular sludge to continuously contact the inner surface of the inner wall and be heated, so that the granular sludge is further dried. The serrations at the top of the blades also control the particle size of the final dried particles to a set size and shape, thereby obtaining a fixed-shaped dried product.

[0062] The outer surface of the rotor is provided with a plurality of ribs extending in the axial direction and spaced apart in the circumferential direction. The blades are mounted to these ribs. As shown in Figures 4 and 5, these ribs include different first ribs 25 (Figure 6 shows an example of a first rib, the dimensions of which are also exemplary only) and second ribs 26 (Figure 7 shows an example of a second rib, the dimensions of which are also exemplary only). The first ribs 25 and the second ribs 26 are arranged alternately, i.e., a second rib is provided between two adjacent first ribs, and a first rib is provided between two adjacent second ribs. The blades are mounted to the ribs via a base plate.

[0063] As shown in Figure 1, the housing 1 comprises multiple connected sections. The drying granulator's heating line 3 (controlled by valve 4) is connected to each of the multiple sections and communicates with the heating space, thereby supplying heating medium to each section. By providing a heating medium control valve (not shown) in each section, the heating medium supplied by the heating line 3 to each section can be independently controlled. Furthermore, the heating medium supplied to each section can be adjusted to meet the different temperature requirements of each section.

[0064] Preferably, the housing 1 comprises four sections, corresponding to the aforementioned drying zone S1, drying zone S2, granulation zone S3, and shaping zone S4. Thus, the temperature of the heating medium delivered to the drying zone S1, drying zone S2, granulation zone S3, and shaping zone S4 can be varied based on the desired temperature. For example, a lower temperature heating medium can be used in the drying zone S1, while a higher temperature heating medium can be used in the granulation zone S3. This allows for flexible adjustment of sludge dryness and improves thermal energy utilization efficiency.

[0065] The shell is a pressure vessel made of container steel. The inner wall, which contacts the thin sludge layer, can be made of composite steel or spray-coated material depending on the sludge composition. The inner diameter of each shell section can be selected based on the sludge treatment scale, with a heating margin of 1.05-1.2 and an aspect ratio (length to inner diameter) of 5.0-6.0.

[0066] The drive system of the dry granulator includes a drive motor 5 and a reducer 6 coupled to the drive motor 5 and the rotor to transmit the driving force of the drive motor to the rotor, causing the rotor to rotate. The drive motor and reducer are well known to those skilled in the art and are not described in detail herein.

[0067] The dry granulator also includes a cooling system 7 and a grease injector 8. The cooling system is coupled to the reducer to cool the drive system, while the grease injector provides grease to the dry granulator's bearings, as described below. The cooling system and grease injector are well known to those skilled in the art and will not be further described herein.

[0068] The drying granulator also includes a thermal imaging camera device 10 installed on the shell, as shown in Figure 17, which is used to monitor the temperature of the inner wall of the drying granulator and the sludge forming condition in real time, including: a mounting bracket 10-5, mounted on the shell 1, and a camera 10-2 mounted on the mounting bracket; a glass observation plate 10-3, mounted on the shell 1, and the camera is installed to be aligned with the glass observation plate 10-3, so that the interior of the shell can be monitored through the glass observation plate; a flushing water filling port 10-1; a nozzle 10-4, connected to the flushing water filling port 10-1 and facing the glass observation plate, so that the nozzle receives flushing water and sprays flushing water onto the glass observation plate.

[0069] The thermal imaging camera device 10 monitors the temperature of the inner wall of the cylinder of the dryer and the sludge forming condition in real time through infrared thermal imaging, reflecting the heat exchange state, so that based on the monitoring results, the blade arrangement can be adjusted, the distribution of the thin mud layer can be optimized, or the parameters of the heating medium (such as temperature, parameters, etc.) can be automatically adjusted to improve the efficiency of drying and granulation.

[0070] The drying and granulating machine also includes a moisture measuring device 11 located at the discharge port. This device collects sludge samples from within the drying and granulating machine in real time for moisture measurement. As shown in Figure 18, the moisture measuring device comprises a window opener 11-1, a sampler 11-2, and a moisture meter 11-3. After discharge, the moisture content of the dried product is measured by opening window opener 11-1, sampling with sampler 11-2, and testing with moisture meter 11-3. The moisture content is then automatically adjusted to control the opening of valve 4 and the parameters of the heating medium.

[0071] The drying granulator also includes an axial displacement type spherical roller bearing 9, as shown in Figure 19. The bearing has various advantages of traditional bearings in terms of load-bearing, is spherical, has strong load-bearing capacity, and also has the axial compensation function of bearing the rotor's thermal elongation and cooling contraction. It is arranged inside the bearing box flange and includes: an outer ring 9-1, which is arranged in the inner hole of the bearing box flange for positioning. The inner hole of the outer ring 9-1 is provided with a curvature, which cooperates with the outer diameter curvature of the spherical transition ring 9-2 and has a spherical function; the spherical transition ring 9-2 is arranged on the inner side of the outer ring The outer diameter of the self-aligning transition ring 9-2 is curved, cooperating with the inner diameter of the outer ring 9-1 to achieve self-alignment. Its inner diameter cooperates with the cylindrical rollers 9-4 to achieve load-bearing and rotational rolling functions. The outer diameter of the inner ring 9-3 cooperates with the cylindrical rollers 9-4 to achieve load-bearing and rotational rolling functions, and is configured to be able to move axially. The cylindrical rollers 9-4 are arranged between the inner diameter of the self-aligning filter ring 9-2 and the inner ring 9-3 and are retained by the roller cage 9-5, which is preferably made of a high-strength, wear-resistant material. The roller bearing 9 also includes a filling port 9-6 for receiving grease.

[0072] Many advantages are achieved through the drying granulator of this application:

[0073] The sludge shows changes in rheology and cohesion during the drying process. The blade arrangement in this article can adapt to the changes in the sludge drying process, create good conditions for synchronous drying and granulation, and avoid the safety and high energy consumption problems of granulation after drying.

[0074] Sludge has different heat transfer characteristics and evaporation rates at different stages of the thermal drying process. The segmented stator can adopt heating media with different parameters according to different stages to improve energy utilization efficiency.

[0075] The application of axial displacement spherical roller bearings increases the service life of the entire machine.

[0076] The contact area between the inner wall of the stator and the sludge is made of composite steel plates or spray materials, which can increase the service life of the whole machine.

[0077] Using thermal imaging devices to monitor the heat exchange status of the dryer and the material forming device in real time, and using moisture measuring devices to monitor the moisture content of the product in real time can provide a good basis and real-time feedback for the adjustment of operating parameters, creating a foundation for intelligent operation.

[0078] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A drying granulator, characterized in that: The drying granulator comprises: a housing having a cylindrical shape, the housing having an inner wall and an outer wall spaced apart in a radial direction so as to define a heating space for accommodating a heating medium; A feed port, located at one end of the shell, is used to receive sludge and is connected to the interior of the shell; A discharge port, located at the other end of the shell body opposite to the one end and connected to the interior of the shell body, for discharging the treated sludge; The rotor is arranged inside the housing and extends coaxially with the housing. The rotor includes a plurality of blades protruding radially outward on an outer surface thereof. The plurality of blades include: a first blade helically disposed on the outer surface of the rotor along a first section of the length of the rotor, the first section being adjacent to the feed port, the first blade being shaped to smear the sludge on the inner surface of the inner wall facing the rotor; a second blade helically disposed on the outer surface of the rotor along a first section of the length of the rotor, the second blade being spaced apart from the first blade, the second blade being shaped to promote mixing of sludges of different viscosities; a third blade spirally disposed on the outer surface of the rotor along a second section of the length of the rotor, the second section being continuous with the first section, the third blade being shaped to scrape the dried sludge off the inner surface of the inner wall to cause it to fall off and promote granulation of the sludge; A fourth blade is spirally arranged on the outer surface of the rotor along the second section of the length of the rotor. The fourth blade is spaced apart from the third blade. The shape of the fourth blade is designed to make the granulated sludge contact with the inner surface of the inner wall, so that the granulated sludge is further dried and the particle size of the granulated sludge is controlled to a set size and shape.

2. The drying granulator according to claim 1, characterized in that: The first blade includes a first substrate and a twisted blade and a bent blade arranged on opposite sides of the first substrate, the first substrate is arranged on the outer surface of the rotor, the twisted blade and the bent blade are spaced apart from the inner surface of the inner wall, The twisting blade is twisted at a predetermined angle relative to the base plate, and the bending blade is obliquely bent at a predetermined angle relative to the base plate, so that during the rotation of the rotor, the twisting blade pushes the sludge toward the bending blade, and the bending blade smears the sludge on the inner surface of the inner wall.

3. The drying granulator according to claim 2, characterized in that: The second blade includes a second substrate and a first twisted blade and a second twisted blade arranged on opposite sides of the second substrate, the second substrate is arranged on the outer surface of the rotor, the first twisted blade is twisted by a first angle relative to the second substrate, and the second twisted blade is twisted by a second angle relative to the second substrate, the first angle is greater than the second angle, The first twisting blade is designed to propel the sludge with increasing viscosity, and the second twisting blade is designed to propel the sludge with decreasing viscosity, thereby promoting mixing of two sludges with different viscosities.

4. The drying granulator according to claim 3, characterized in that: The third blade comprises a third substrate and a third twisted blade and a straight blade arranged on opposite sides of the third substrate. The third substrate is arranged on the outer surface of the rotor. The third twisted blade is twisted at a predetermined angle relative to the third substrate. The third twisted blades push the dried sludge to move toward the straight blades, so that the straight blades scrape the dried sludge off the inner surface of the inner wall, causing it to fall off, thereby promoting granulation of the dried sludge.

5. The drying granulator according to claim 4, characterized in that: The fourth blade comprises a fourth substrate and a first bent blade and a second bent blade arranged on opposite sides of the fourth substrate, the fourth substrate being arranged on the outer surface of the rotor, the first bent blade being bent at a first angle relative to the fourth substrate, the second bent blade being bent at a second angle relative to the fourth substrate, and the top end of the inner surface of the first bent blade and / or the second bent blade facing the inner wall is provided with saw teeth, The first bending blade and the second bending blade are designed to promote the granulated sludge to contact with the inner surface of the inner wall, so as to further dry the granulated sludge, and control the particle size of the granulated sludge to a set size and shape through the saw teeth to obtain shaped granulated sludge.

6. The drying granulator according to any one of claims 1 to 5, characterized in that: The housing comprises a plurality of sections, The dry granulator includes a heating pipeline which is respectively connected to each of the plurality of sections so as to supply a heating medium to a heating space of each section.

7. The drying granulator according to claim 6, characterized in that: The heating pipeline supplies heating media having different parameters to the multiple sections.

8. The drying granulator according to any one of claims 1 to 5, characterized in that: The drying granulator comprises a driving system, which comprises: Drive motor; The speed reducer is coupled to the drive motor and the rotor to transmit the drive force of the drive motor to the rotor to rotate the rotor.

9. The drying granulator according to claim 8, characterized in that: The dry granulator further comprises a cooling system and a grease injector. The cooling system is connected to the reducer and is used to provide cooling for the driving system. The grease injector is used to provide grease for the bearings of the dry granulator.

10. The drying granulator according to any one of claims 1 to 5, characterized in that: The drying granulator further comprises a thermal imaging camera device mounted on the housing, the thermal imaging camera device is used to monitor the temperature of the inner wall of the drying granulator and the sludge forming condition in real time, including: A mounting bracket is mounted to the housing, and the camera is mounted to the mounting bracket; A glass viewing panel is mounted to the housing, and a camera is mounted to be aimed at the glass viewing panel so that the interior of the housing can be monitored through the glass viewing panel.

11. The drying granulator according to claim 10, characterized in that: The thermal imaging device comprises: Flush water fill port; A nozzle is connected to the flushing water filling port and is directed toward the glass viewing plate so that the nozzle receives the flushing water and sprays the flushing water toward the glass viewing plate.

12. The drying granulator according to any one of claims 1 to 5, characterized in that: The drying granulator further comprises a moisture measuring device arranged near the discharge port, and the moisture measuring device can collect sludge samples from the drying granulator in real time to perform moisture detection.

13. The drying granulator according to any one of claims 1 to 5, characterized in that: The drying granulator also includes an axial displacement type spherical roller bearing, which is sleeved in the bearing box flange and includes: Outer ring; A self-aligning transition ring is arranged on the inner side of the outer ring; An inner ring, disposed inside the self-aligning filter ring and configured to be displaceable in the axial direction; The cylindrical rollers are arranged between the self-aligning filter ring and the inner ring and are held by the roller cage.

14. The drying granulator according to any one of claims 1 to 5, characterized in that: A plurality of ribs extending in the axial direction and spaced apart in the circumferential direction are arranged on the outer surface of the rotor, and the blades are mounted on the plurality of ribs. The plurality of ribs include first ribs and second ribs different from each other, and the first ribs and the second ribs are arranged alternately with each other.

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