Vertical sludge drying and granulating device and system

Abstract

The invention provides a vertical sludge drying and granulating device and system, and relates to the field of sludge drying and granulating, the vertical sludge drying and granulating device comprises a drying and granulating machine, the drying and granulating machine is internally provided with a series of vertically-arranged and horizontally-placed small disc bodies and large disc bodies, the disc bodies are heated through a closed-cycle hot oil system, and the small disc bodies and the large disc bodies in the drying and granulating machine are sequentially and alternately arranged from top to bottom; a main shaft in the center of the drying granulator is driven by a motor to rotate together with a rake arm and a rake blade which are fixed on the main shaft, sludge mixed by a coating machine enters a disc body on the uppermost layer of the drying granulator from a top feeding port of the drying granulator, and under the action of the rotary rake blade, the sludge is stirred and heated while being turned over, and the sludge is discharged from a discharging port of the drying granulator. And while moving from the inner edge to the outer edge in an exponential spiral line shape, the sludge is heated and dried on the disc body and forms granules at the same time, and finally, the granules are discharged from the bottom of the drying granulator. And through a coating back-mixing process, the moisture content of the sludge entering the drying machine is controlled to be 40% or below, the plastic stage of the sludge is avoided, and the energy consumption is reduced.

Description

Technical Field

[0001] This invention relates to the field of sludge drying and granulation, and more particularly to a vertical sludge drying and granulation device and system. Background Technology

[0002] Sludge drying and granulation technology can effectively reduce the water content and volume of sludge by drying, dewatering, and granulating it, thereby improving the stability and resource utilization potential of sludge (incineration power generation; landscaping; building materials and mine restoration).

[0003] In existing technologies, sludge is directly dried. According to the relationship curve between sludge drying energy consumption and sludge moisture content, the energy consumption for drying increases sharply when the sludge moisture content is between 40% and 60%. This range represents the plastic stage of the sludge, where its fluid properties are similar to glue, making it difficult to process. In the plastic stage, sludge is in a gel-like phase, easily agglomerating, resulting in a hard surface on the dried sludge while the interior remains a thin, sludge-like substance.

[0004] Furthermore, in existing technologies, a large area of ​​the mixing blades comes into contact with the sludge, and inorganic substances such as sand particles in the sludge can damage the mixing blades. Summary of the Invention

[0005] The present invention provides a vertical sludge drying and granulation device and system to solve at least one of the technical problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention discloses a vertical sludge drying and granulation device, comprising: The drying granulator includes a shell and a series of vertically arranged, horizontally placed discs inside. These discs include small and large discs, heated by a closed-loop hot oil system. The small and large discs are arranged alternately from top to bottom. A main shaft at the center of the drying granulator rotates with a motor, along with rake arms and blades fixed to it. Sludge mixed by a coating machine enters the uppermost disc from the top feed port. Under the action of the rotating rake blades, the sludge is tumbled, stirred, and heated while moving exponentially from the inner edge to the outer edge in a spiral pattern. The sludge is heated and dried on the discs, forming granules, and finally discharged from the bottom of the drying granulator, where it is lifted by a bucket elevator to a vibrating separator screen.

[0007] Preferably, the disk body is a circular disk.

[0008] Preferably, the rake blade is connected to the rake arm by a spring, and the rake arm is fixed to a circular plate fixed on the main shaft.

[0009] Preferably, the raw sludge is mixed with dry powder by a coating machine, and the resulting mixture is fed into a drying granulator for drying and granulation.

[0010] Preferably, the moisture content of the raw sludge is 70-85%, the moisture content of the mixed discharge is less than 40%, the moisture content of the dry powder is less than 5%, and the final dried and granulated product has a moisture content of 10-30%.

[0011] Preferably, the temperature of the heat transfer oil is 220–280°C.

[0012] Preferably, inert gas is used to control the oxygen content inside the drying granulator to be below 3% and the particle temperature to be below 90°C.

[0013] Preferably, the finished product consists of 3-5 mm particles.

[0014] A vertical sludge drying and granulation system includes the aforementioned vertical sludge drying and granulation device, and further includes a drying and granulation evaluation device, wherein the drying and granulation evaluation device includes: First acquisition module: used to acquire the standard target parameters during the drying of the current type of sludge in the test volume. The standard target parameters include: the standard target rotation speed of the spindle, the standard target temperature of the heat transfer oil, and the standard average moisture content and standard average temperature of the sludge on each disc. The second acquisition module is used to acquire the actual spindle speed - first actual moisture content efficiency - first actual temperature efficiency mapping table when the current type of sludge is dried, under the conditions that the actual spindle speed is the standard target speed of the spindle and the actual temperature of the heat transfer oil is the standard target temperature of the heat transfer oil. The third acquisition module is used to acquire the actual heat transfer oil temperature - second actual moisture content efficiency - second actual temperature efficiency mapping table when the current type of sludge is dried, under the condition that the actual temperature of the heat transfer oil is within the second preset range of the standard target temperature of the heat transfer oil and the actual spindle speed is the standard target speed of the spindle; the current type of sludge and the current batch of sludge are the same type of sludge, but the actual moisture content is slightly different.

[0015] First control module: used to control the actual rotation speed of the spindle to the standard target rotation speed of the spindle obtained by the first acquisition module and the actual temperature of the heat transfer oil to the standard target temperature of the heat transfer oil to perform the first drying test on the current batch of sludge, and during the first drying test, the actual average moisture content and actual average temperature of the sludge on the disc are detected and acquired. First calculation module; calculates third actual moisture content efficiency and third actual temperature efficiency based on first acquisition module and first control module; The second calculation module is used to calculate the first matching value of the spindle speed based on the mapping table of actual spindle speed, first actual moisture content efficiency, first actual temperature efficiency, third actual moisture content efficiency, and third actual temperature efficiency. The third calculation module is used to calculate the second matching value of temperature based on the mapping table of actual heat transfer oil temperature - second actual water content efficiency - second actual temperature efficiency and third actual water content efficiency and third actual temperature efficiency; The filtering module is used to sort all the first and second matching values ​​from largest to smallest, and determine the temperature and speed corresponding to the largest matching value after sorting as the set temperature and set speed. The second control module is used to control the actual rotational speed of the main shaft to the set rotational speed and the actual temperature of the heat transfer oil to the set temperature when the current batch of sludge is dried and granulated.

[0016] Preferably, the first calculation module calculates based on the following formula: ; ; For the third actual moisture content efficiency, The third actual temperature efficiency; M is the total number of disks; This represents the actual average moisture content of the i-th disc during the first drying test. Let be the standard average moisture content of the i-th disc; This represents the actual average temperature of the i-th disk during the first drying test. Let be the standard average temperature of the i-th disk. The second calculation module is based on the following formula: ; The first matching value corresponding to the j-th actual spindle speed in the mapping table of actual spindle speed - first actual moisture content efficiency - first actual temperature efficiency; These are the first actual moisture content efficiency and the first actual temperature efficiency corresponding to the j-th actual spindle speed in the mapping table of actual spindle speed - first actual moisture content efficiency - first actual temperature efficiency. These are the water content efficiency weight and the temperature efficiency weight, respectively. The third calculation module is based on the following formula: ; The second matching value corresponding to the kth actual heat transfer oil temperature in the mapping table of actual heat transfer oil temperature - second actual water content efficiency - second actual temperature efficiency; These are the second actual water content efficiency and the second actual temperature efficiency corresponding to the kth actual heat transfer oil temperature in the mapping table of actual heat transfer oil temperature - second actual water content efficiency - second actual temperature efficiency.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: By using a coating remixing process, the moisture content of the sludge entering the dryer is controlled to be below 40%, bypassing the plastic stage of the sludge and reducing energy consumption.

[0018] By remixing the dry materials, the dry sludge acts as a crystal nucleus, while the wet sludge is only thinly coated on the dry materials. This prevents clumping and sticking during the drying process and avoids the discharge material from having a "wet inside and dry outside" mushy texture.

[0019] The vertical sludge drying and granulation equipment is an indirect heating, multi-disc drying system. The heat required during the sludge drying process is transferred by heat transfer oil, which has a temperature of 220-280℃ and circulates within the hollow discs.

[0020] 1. Organic matter in sludge is highly adhesive and easily adheres to the surface of the dryer wall, forming scale (existing technology). ---Through a unique coating remixing technology, the moisture content of the sludge entering the dryer is made to exceed the plastic stage, thus avoiding adhesion.

[0021] 2. Inorganic materials such as sand particles in sludge can wear down equipment (existing technology); ---Unique spring rake tooth design reduces equipment wear.

[0022] 3. High wear on rotating parts (existing technology); ---The central spindle drives the rake arm and rake teeth. The rake teeth have no direct contact with the equipment and experience almost no wear.

[0023] 4. Large footprint (existing technology); The vertical layout saves space, offers great flexibility, and occupies about one-third the area of ​​a horizontal layout.

[0024] 5. Direct drying of exhaust gas results in complex composition (existing technology); Indirect drying results in less exhaust gas and a simpler composition.

[0025] 6. Dust explosion risk (existing technology) Using inert gas to control the oxygen content inside the equipment to be below 3% and the particle temperature to be below 90℃, the finished product is 3~5mm particles, with no risk of dust explosion. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1This is a schematic diagram of the internal structure of the drying granulator of the present invention; Figure 2 This is a schematic diagram of the overall structure of the drying granulator of the present invention; Figure 3 This is a flowchart of the coating remixing and drying granulation process of the present invention; Figure 4 This invention provides a pilot-scale description of sludge drying for the present invention. Figure 5 For the purpose of testing the present invention Figure 1 ; Figure 6 For the purpose of testing the present invention Figure 2 ; Figure 7 For the purpose of testing the present invention Figure 3 ; Figure 8 For the purpose of testing the present invention Figure 4 ; Figure 9 For the purpose of testing the present invention Figure 5 ; Figure 10 For the purpose of testing the present invention Figure 6 .

[0028] In the diagram: 1. Drying granulator; 11. Drying granulator shell; 2. Small disc; 3. Large disc; 4. Main shaft; 5. Rake arm; 6. Rake blade; 7. Motor. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0030] This invention provides a vertical sludge drying and granulation device, such as... Figure 1-10 As shown, it includes: The drying granulator 1 includes a drying granulator shell 11, inside which a series of vertically arranged and horizontally placed discs are set. The discs include small discs 2 and large discs 3. The discs are heated by a closed-loop hot oil system. The small discs 2 and large discs 3 are arranged alternately from top to bottom in the drying granulator 1. The main shaft 4 located at the center of the drying granulator 1 is driven by a motor and rotates together with the rake arms 5 and rake blades 6 fixed on the main shaft 4. The sludge mixed by the coating machine enters the uppermost disc of the drying granulator 1 from the top feed port. Under the action of the rotating rake blades 6, the sludge is turned, stirred and heated while moving in an exponential spiral shape from the inner edge to the outer edge. The sludge is heated and dried on the disc and forms granules. Finally, it is discharged from the bottom of the drying granulator 1 and lifted to the vibrating separator screen by a bucket elevator.

[0031] Preferably, the disk body is a circular disk.

[0032] Preferably, the rake blade 6 is connected to the rake arm 5 by a spring, and the rake arm 5 is fixedly connected to a circular plate fixed on the main shaft.

[0033] Preferably, the raw sludge is mixed with dry powder by a coating machine to obtain a mixed discharge that is then fed into a drying granulator 1 for drying and granulation.

[0034] Preferably, the moisture content of the raw sludge is 70-85%, the moisture content of the mixed discharge is less than 40%, the moisture content of the dry powder is less than 5%, and the final dried and granulated product has a moisture content of 10-30%.

[0035] Preferably, the temperature of the heat transfer oil is 220–280°C.

[0036] Preferably, inert gas is used to control the oxygen content in the drying granulator 1 to be below 3%, the particle temperature to be below 90°C, and the finished product to be 3-5 mm particles.

[0037] Application areas: It can be used to treat various municipal sludge, industrial sludge, ditch sludge, livestock and poultry manure, distiller's grains, tea residue, fruit residue, pharmaceutical residue, tailings slag, photovoltaic plant waste silica mud, coal slime, etc.

[0038] China's first vertical disc sludge drying and granulation integrated equipment Main objective: To verify the effectiveness of drying and waste heat recovery, and to recover and utilize the waste heat generated during the drying process to heat the equipment room, thereby saving on winter heating costs; The beneficial effects of the above technical solution are as follows: By using a coating remixing process, the moisture content of the sludge entering the dryer is controlled to be below 40%, bypassing the plastic stage of the sludge and reducing energy consumption.

[0039] By remixing the dry materials, the dry sludge acts as a crystal nucleus, while the wet sludge is only thinly coated on the dry materials. This prevents clumping and sticking during the drying process and avoids the discharge material from having a "wet inside and dry outside" mushy texture.

[0040] The vertical sludge drying and granulation equipment is an indirect heating, multi-disc drying system. The heat required during the sludge drying process is transferred by heat transfer oil, which has a temperature of 220-280℃ and circulates within the hollow discs.

[0041] 1. Organic matter in sludge is highly adhesive and easily adheres to the surface of the dryer wall, forming scale (existing technology). ---Through a unique coating remixing technology, the moisture content of the sludge entering the dryer is made to exceed the plastic stage, thus avoiding adhesion.

[0042] 2. Inorganic materials such as sand particles in sludge can wear down equipment (existing technology); ---Unique spring rake tooth design reduces equipment wear.

[0043] 3. High wear on rotating parts (existing technology); ---The central spindle drives the rake arm and rake teeth. The rake teeth have no direct contact with the equipment and experience almost no wear.

[0044] 4. Large footprint (existing technology); The vertical layout saves space, offers great flexibility, and occupies about one-third the area of ​​a horizontal layout.

[0045] 5. Direct drying of exhaust gas results in complex composition (existing technology); Indirect drying results in less exhaust gas and a simpler composition.

[0046] 6. Dust explosion risk (existing technology) Using inert gas to control the oxygen content inside the equipment to be below 3% and the particle temperature to be below 90℃, the finished product is 3~5mm particles, with no risk of dust explosion.

[0047] Example 2, based on Example 1, further discloses a vertical sludge drying and granulation system, including the aforementioned vertical sludge drying and granulation device, and also includes a drying and granulation evaluation device, wherein the drying and granulation evaluation device includes: First acquisition module: used to acquire the standard target parameters during the drying of the current type of sludge in the test volume. The standard target parameters include: the standard target rotation speed of the spindle 4, the standard target temperature of the heat transfer oil, and the standard average moisture content and standard average temperature of the sludge on each plate. The second acquisition module is used to acquire the actual spindle speed 4 - first actual moisture content efficiency - first actual temperature efficiency mapping table when the current type of sludge is dried, under the conditions that the actual spindle speed 4 is the standard target speed of the spindle 4 and the actual temperature of the heat transfer oil is the standard target temperature of the heat transfer oil. The third acquisition module is used to acquire the actual heat transfer oil temperature - second actual moisture content efficiency - second actual temperature efficiency mapping table when the current type of sludge is dried, under the condition that the actual temperature of the heat transfer oil is within the second preset range of the standard target temperature of the heat transfer oil and the actual spindle speed is the standard target speed of the spindle 4. First control module: used to control the actual rotation speed of spindle 4 to the standard target rotation speed of spindle 4 obtained by the first acquisition module to perform the first drying test on the current batch of sludge, and during the first drying test, the actual average moisture content and actual average temperature of the sludge on the disc are detected and acquired. First calculation module; calculates third actual moisture content efficiency and third actual temperature efficiency based on first acquisition module and first control module; The second calculation module is used to calculate the first matching value of the rotational speed based on the mapping table of actual spindle speed, first actual moisture content efficiency, first actual temperature efficiency, third actual moisture content efficiency, and third actual temperature efficiency. The third calculation module is used to calculate the second matching value of temperature based on the mapping table of actual heat transfer oil temperature - second actual water content efficiency - second actual temperature efficiency and third actual water content efficiency and third actual temperature efficiency; The filtering module is used to sort all the first and second matching values ​​from largest to smallest, and determine the temperature and speed corresponding to the largest matching value after sorting as the set temperature and set speed. The second control module is used to control the actual rotational speed of the main shaft 4 to the set rotational speed and the actual temperature of the heat transfer oil to the set temperature when the current batch of sludge is dried and granulated.

[0048] The first calculation module is based on the following formula: ; ; For the third actual moisture content efficiency, The third actual temperature efficiency; M is the total number of disks; This represents the actual average moisture content of the i-th disc during the first drying test. Let be the standard average moisture content of the i-th disc; This represents the actual average temperature of the i-th disk during the first drying test. Let be the standard average temperature of the i-th disk. The second calculation module is based on the following formula: ; The first matching value is the j-th actual spindle speed (which can be selected according to the preset actual heat transfer oil temperature interval or selected as an integer) in the mapping table of actual spindle speed - first actual moisture content efficiency - first actual temperature efficiency. These are the first actual moisture content efficiency and the first actual temperature efficiency corresponding to the j-th actual spindle speed in the mapping table of actual spindle speed - first actual moisture content efficiency - first actual temperature efficiency. These are the water content efficiency weight and the temperature efficiency weight, respectively. The third calculation module is based on the following formula: ; The second matching value is the kth actual heat transfer oil temperature (which can be selected according to the preset actual heat transfer oil temperature interval or selected as an integer) in the mapping table of actual heat transfer oil temperature - second actual water content efficiency - second actual temperature efficiency. , These are the second actual water content efficiency and the second actual temperature efficiency corresponding to the kth actual heat transfer oil temperature in the mapping table of actual heat transfer oil temperature - second actual water content efficiency - second actual temperature efficiency.

[0049] (a) Obtaining standard target parameters The standard target parameters include the standard target rotational speed of spindle 4, the standard target temperature of the heat transfer oil, and the standard average moisture content and temperature of the sludge on each disc. These parameters are typically obtained based on the following steps: First, multiple drying tests are conducted on the sludge under different spindle rotational speeds and heat transfer oil temperatures, recording the moisture content and temperature data of the sludge on each disc. Then, these test data are analyzed and processed to determine the optimal values ​​of the spindle rotational speed and heat transfer oil temperature under specific drying effect requirements (such as achieving a specified moisture content standard), which are then used as the standard target rotational speed and standard target temperature of the heat transfer oil. Simultaneously, under optimal operating conditions, the sludge on each disc is sampled and tested multiple times, and its average moisture content and temperature are calculated as the standard average moisture content and standard average temperature. These standard target parameters are stored in the system's database for use by the first acquisition module.

[0050] (ii) Obtaining the relevant parameters of the mapping table 1. Mapping table of actual spindle speed - first actual moisture content efficiency - first actual temperature efficiency When the second acquisition module acquires the mapping table, it needs to perform a drying test on the current type of sludge under the conditions that the actual spindle speed is within a first preset range of the standard target speed of spindle 4 (e.g., ±5% of the standard target speed) and the actual temperature of the heat transfer oil is maintained at the standard target temperature of the heat transfer oil. During the test, the actual spindle speed is adjusted to different values ​​within the first preset range, and multiple drying tests are performed at each speed value to detect the actual average moisture content and actual average temperature of the sludge on each disc. Then, according to the formula of the first calculation module, the first actual moisture content efficiency and the first actual temperature efficiency corresponding to each actual spindle speed are calculated. These speed values ​​and corresponding efficiency values ​​are organized and recorded to form a mapping table of actual spindle speed - first actual moisture content efficiency - first actual temperature efficiency.

[0051] 2. Mapping table of actual heat transfer oil temperature - second actual water content efficiency - second actual temperature efficiency When the third acquisition module acquires the mapping table, it needs to perform a drying test on the current type of sludge under the conditions that the actual temperature of the heat transfer oil is within the second preset range of the standard target temperature of the heat transfer oil (e.g., ±10℃ of the standard target temperature) and the actual spindle speed is maintained at the standard target speed of spindle 4. During the test, the actual temperature of the heat transfer oil is adjusted to different values ​​within the second preset range, and multiple drying tests are performed at each temperature value to detect the actual average moisture content and actual average temperature of the sludge on each plate. Similarly, according to the formula of the first calculation module, the second actual moisture content efficiency and the second actual temperature efficiency corresponding to each actual heat transfer oil temperature are calculated. These temperature values ​​and corresponding efficiency values ​​are organized and recorded to form a mapping table of actual heat transfer oil temperature - second actual moisture content efficiency - second actual temperature efficiency.

[0052] (III) Acquisition of actual parameters in the first drying test When the first control module controls the actual rotational speed of spindle 4 to the standard target speed and the actual temperature of the heat transfer oil to the standard target temperature for the first drying test, it is necessary to obtain the actual average moisture content and actual average temperature of the sludge on the discs. Specifically, a detachable moisture content sensor and temperature sensor are installed on each disc, and the sensors monitor the moisture content and temperature data of the sludge on the discs in real time. The data acquisition system periodically (e.g., every second) collects data from these sensors and averages the data from each disc during the test to obtain the actual average moisture content and actual average temperature of each disc. This data is then transmitted to the first calculation module to calculate the third actual moisture content efficiency and the third actual temperature efficiency.

[0053] (iv) The moisture content efficiency weight and temperature efficiency weight are usually set by the process designer based on actual production needs and sludge characteristics. For example, if the requirements for sludge moisture content are more stringent, the moisture content efficiency weight can be set higher; if temperature has a greater impact on the energy consumption or equipment of the drying process, the temperature efficiency weight can be appropriately increased. These weight values ​​are generally set during system initialization and can be adjusted according to actual production conditions. The total number of disks M is determined during device design and installation, stored in the system's basic parameters, and is used by the first calculation module. The beneficial effects of the above technical solution are as follows: This device, through the collaborative work of multiple modules, can accurately determine the optimal spindle speed and heat transfer oil temperature during the drying and granulation process. The first acquisition module acquires standard target parameters, providing a benchmark for drying tests; the first control module controls the actual speed of the spindle 4 to the standard target speed and the actual temperature of the heat transfer oil to the standard target temperature for the first drying test, and detects the actual average moisture content and temperature of the sludge on the disc. The first calculation module calculates the third actual moisture content efficiency and temperature efficiency based on the detection data and standard target parameters, providing a basis for subsequent matching value calculations. The second and third calculation modules calculate the matching values ​​of speed and temperature based on the corresponding mapping tables and the third actual efficiency, respectively. The screening module determines the speed and temperature corresponding to the maximum matching value as the setting parameters. This design ensures that during batch drying and granulation, the spindle speed and heat transfer oil temperature can be controlled at the optimal state, making the sludge drying more uniform and the moisture content more in line with requirements, thereby improving the efficiency and quality of drying and granulation and reducing the generation of unqualified products.

[0054] The device establishes mapping tables for actual spindle speed, first actual moisture content efficiency, and first actual temperature efficiency, as well as mapping tables for actual heat transfer oil temperature, second actual moisture content efficiency, and second actual temperature efficiency, comprehensively reflecting the drying effect under different speed and temperature conditions. When calculating the matching value, the device combines the weights of moisture content efficiency and temperature efficiency, comprehensively considering the impact of moisture content and temperature on the drying effect, making the resulting speed and temperature settings more adaptable to the drying characteristics of the current batch of sludge. This precise matching and optimization method avoids the blindness and empirical nature of parameter settings in traditional methods, improves the controllability and stability of the drying and granulation process, and allows for flexible parameter adjustment according to different sludge characteristics, ensuring optimal drying and granulation results.

[0055] The device considers multiple factors and preset ranges when acquiring parameters and performing calculations. For example, the second acquisition module acquires the mapping table under the condition that the actual spindle speed is within a first preset range of the standard target speed and the actual temperature of the heat transfer oil is at the standard target temperature; the third acquisition module acquires the mapping table under the condition that the actual temperature of the heat transfer oil is within a second preset range of the standard target temperature and the actual spindle speed is at the standard target speed. This design enables the system to operate normally within a certain parameter fluctuation range, enhancing its adaptability to changes in actual working conditions. Simultaneously, through a rigorous calculation and screening process, the rationality and reliability of the set parameters are ensured, reducing system failures and poor drying effects caused by improper parameter settings, and improving the reliability and stability of the entire drying and granulation system.

[0056] During operation, the device acquires and processes a large amount of data, such as standard target parameters, actual test data, and mapping table data. Recording and managing this data facilitates comprehensive monitoring and analysis of the drying and granulation process. Analysis of historical data reveals the characteristic changes of different sludge types during the drying and granulation process, providing a reference for subsequent process optimization and parameter adjustments. Simultaneously, real-time acquisition and display of various parameters allows operators to promptly grasp the system's operating status, identify problems, and address them in a timely manner, thereby improving the management level and efficiency of the production process.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vertical sludge drying and granulation device, characterized in that, include: The drying granulator (1) includes a drying granulator shell (11), inside which are arranged a series of vertically arranged and horizontally placed discs, including small discs (2) and large discs (3). The discs are heated by a closed-loop hot oil system. The small discs (2) and large discs (3) are arranged alternately from top to bottom in the drying granulator (1). The main shaft (4) located at the center of the drying granulator (1) is driven by a motor and is fixed to the main shaft. The rake arm (5) and rake blade (6) on the main shaft (4) rotate together. The sludge mixed by the coating machine enters the uppermost disc of the drying granulator (1) from the top feed port. Under the action of the rotating rake blade (6), the sludge is turned, stirred and heated while moving in an exponential spiral shape from the inner edge to the outer edge. The sludge is heated and dried on the disc and forms granules. Finally, it is discharged from the bottom of the drying granulator (1) and lifted to the vibrating separation screen by the bucket elevator.

2. The vertical sludge drying and granulation device according to claim 1, characterized in that, The disk is a round disk.

3. The vertical sludge drying and granulation device according to claim 1, characterized in that, The rake blade (6) is connected to the rake arm (5) by a spring, and the rake arm (5) is fixedly connected to the circular plate fixed on the main shaft.

4. The vertical sludge drying and granulation device according to claim 1, characterized in that, The raw sludge is mixed with dry powder by a coating machine and the resulting mixture is fed into a drying granulator (1) for drying and granulation.

5. A vertical sludge drying and granulation device according to claim 4, characterized in that, The original sludge has a moisture content of 70-85%, the mixed discharge has a moisture content of less than 40%, the dry powder has a moisture content of less than 5%, and the final dried and granulated product has a moisture content of 10-30%.

6. A vertical sludge drying and granulation device according to claim 1, characterized in that, The temperature of the heat transfer oil is 220-280℃.

7. A vertical sludge drying and granulation device according to claim 1, characterized in that, The oxygen content inside the drying granulator (1) is controlled by inert gas to be less than 3% and the particle temperature is less than 90℃.

8. A vertical sludge drying and granulation device according to claim 1, characterized in that, The finished product consists of 3-5mm particles.

9. A vertical sludge drying and granulation system, characterized in that, The vertical sludge drying and granulation device includes any one of claims 1-8, and the vertical sludge drying and granulation system further includes a drying and granulation evaluation device, the drying and granulation evaluation device comprising: First acquisition module: used to acquire the standard target parameters during the drying of the current type of sludge in the test volume. The standard target parameters include: the standard target rotation speed of the spindle, the standard target temperature of the heat transfer oil, and the standard average moisture content and standard average temperature of the sludge on each disc. The second acquisition module is used to acquire the actual spindle speed - first actual moisture content efficiency - first actual temperature efficiency mapping table when the current type of sludge is dried, under the conditions that the actual spindle speed is the standard target speed of the spindle and the actual temperature of the heat transfer oil is the standard target temperature of the heat transfer oil. The third acquisition module is used to acquire the actual heat transfer oil temperature - second actual moisture content efficiency - second actual temperature efficiency mapping table when the current type of sludge is dried, under the condition that the actual temperature of the heat transfer oil is within the second preset range of the standard target temperature of the heat transfer oil and the actual spindle speed is the standard target speed of the spindle. First control module: used to control the actual rotation speed of the spindle to the standard target rotation speed of the spindle obtained by the first acquisition module and the actual temperature of the heat transfer oil to the standard target temperature of the heat transfer oil to perform the first drying test on the current batch of sludge, and during the first drying test, the actual average moisture content and actual average temperature of the sludge on the disc are detected and acquired. First calculation module; calculates third actual moisture content efficiency and third actual temperature efficiency based on first acquisition module and first control module; The second calculation module is used to calculate the first matching value of the spindle speed based on the mapping table of actual spindle speed, first actual moisture content efficiency, first actual temperature efficiency, third actual moisture content efficiency, and third actual temperature efficiency. The third calculation module is used to calculate the second matching value of temperature based on the mapping table of actual heat transfer oil temperature - second actual water content efficiency - second actual temperature efficiency and third actual water content efficiency and third actual temperature efficiency; The filtering module is used to sort all the first and second matching values ​​from largest to smallest, and determine the temperature and speed corresponding to the largest matching value after sorting as the set temperature and set speed. The second control module is used to control the actual rotational speed of the main shaft to the set rotational speed and the actual temperature of the heat transfer oil to the set temperature when the current batch of sludge is dried and granulated.

10. A vertical sludge drying and granulation system according to claim 9, characterized in that, The first calculation module is based on the following formula: ； ； For the third actual moisture content efficiency, The third actual temperature efficiency; M is the total number of disks; This represents the actual average moisture content of the i-th disc during the first drying test. Let be the standard average moisture content of the i-th disc; This represents the actual average temperature of the i-th disk during the first drying test. Let be the standard average temperature of the i-th disk. The second calculation module is based on the following formula: ； The first matching value corresponding to the j-th actual spindle speed in the mapping table of actual spindle speed - first actual moisture content efficiency - first actual temperature efficiency; These are the first actual moisture content efficiency and the first actual temperature efficiency corresponding to the j-th actual spindle speed in the mapping table of actual spindle speed - first actual moisture content efficiency - first actual temperature efficiency. These are the water content efficiency weight and the temperature efficiency weight, respectively. The third calculation module is based on the following formula: ； The second matching value corresponding to the kth actual heat transfer oil temperature in the mapping table of actual heat transfer oil temperature - second actual water content efficiency - second actual temperature efficiency; These are the second actual water content efficiency and the second actual temperature efficiency corresponding to the kth actual heat transfer oil temperature in the mapping table of actual heat transfer oil temperature - second actual water content efficiency - second actual temperature efficiency.

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