Rotary sludge waste heat drying equipment control system

Abstract

The invention provides a rotary sludge waste heat drying equipment control system, and relates to the field of control systems.The control system comprises a comprehensive detection module used for detecting sludge key parameters before and after drying, the conveying speed of sludge in a cylinder, dry gas parameters of a gas inlet area and the temperature of a temperature measuring point on the outer surface of the cylinder; the storage module is used for storing reference drying control parameters (including air inlet flow, the rotating speed of the spiral conveying assembly and the rotating speed of the drying cylinder) of various types of sludge; before batch production, the test control module controls the initial measurement duration of equipment work according to the current sludge reference parameters and controls the comprehensive detection module to operate; the intelligent operation analysis module analyzes the initially measured data, judges whether to adjust the rotating speed of the spiral conveying / drying cylinder or not, and determines a strategy when adjustment is needed; and the main control module is communicated with each module, receives the adjustment strategy and issues the adjustment strategy to the equipment execution unit to complete parameter adjustment. According to the method, the control parameters are accurately adjusted aiming at the current sludge by collecting data through the initial measurement time length, performing intelligent operation analysis and performing dynamic adjustment.

Description

Technical Field

[0001] This invention relates to the field of control systems, specifically to a control system for a rotary sludge waste heat drying equipment. Background Technology

[0002] Sludge, primarily produced by urban and industrial wastewater treatment plants, is a byproduct of wastewater treatment. Its complex composition includes not only high levels of water but also the potential accumulation of organic matter, heavy metals, and pathogens, making it highly susceptible to secondary pollution if not properly disposed of. Therefore, scientific and rational sludge treatment and resource utilization are crucial and indispensable links in the entire wastewater treatment chain. Due to its high water content and large volume, sludge storage, transportation, and subsequent disposal are challenging, making drying a key preliminary step for achieving sludge resource utilization.

[0003] Among various drying technologies, sludge drying equipment is used for drying, and the control system in sludge drying equipment is crucial. Existing sludge drying equipment, such as CN203128374U, discloses a drying control method for a sludge dryer that "uses front, middle, and rear temperature sensors inside the outer shell to control the amount of steam, regulate the internal temperature of the outer shell, and operate automatically and conveniently." However, this method has the following problems: 1. Controlling the equipment solely by controlling the temperature of the outer casing cannot take into account the temperature distribution differences in different areas inside the casing, which can easily lead to situations where the sludge is "locally too dry / not completely dry"; 2. Without matching differentiated control parameters for different sludge types, problems such as conveying blockage or low drying efficiency are likely to occur when dealing with sludge with different viscosity and moisture content. Summary of the Invention

[0004] The present invention provides a control system for a rotary sludge waste heat drying equipment to solve at least one of the technical problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, this invention discloses a control system for a rotary sludge waste heat drying equipment. The drying equipment includes a rotary drying drum, and the control system includes: The comprehensive testing module is used to detect key parameters of sludge before and after drying, sludge conveying speed inside the rotary dryer, key parameters of drying gas in the air inlet area of ​​the rotary dryer, and temperature at different temperature measurement points on the outer surface of the rotary dryer. Storage module: Stores the baseline drying control parameters for each type of sludge; the drying control parameters include: air inlet flow rate, screw conveyor assembly speed, and rotary drying drum speed; Test control module: used to control the initial test duration of the drying equipment based on the current sludge type's baseline drying control parameters before mass production; and to control the operation of the comprehensive testing module within the initial test duration; Intelligent computing and analysis module: used to jointly analyze the detection results of the comprehensive detection module within the initial test period, to determine whether the speed of the screw conveyor component needs to be adjusted and whether the speed of the rotary drying cylinder needs to be adjusted, and when it is determined that the corresponding drying control parameters need to be adjusted, to determine the corresponding adjustment strategy; Main control module: It communicates with the integrated detection module, storage module, test control module and intelligent operation and analysis module respectively. It receives the adjustment strategy output by the intelligent operation and analysis module and directly sends it to the execution unit of the drying equipment to complete the parameter adjustment.

[0006] Preferably, the intelligent components of the rotary sludge waste heat drying equipment include: a screw conveyor assembly, a drying cylinder rotation drive assembly, and a drying air intake assembly.

[0007] Key parameters of the sludge include: the moisture content of the sludge; the drying air intake assembly is used to input drying gas into the air intake area of ​​the rotary drying cylinder.

[0008] Preferably, the integrated detection module includes: Sludge testing unit: used to detect key parameters of sludge before and after drying; Speed ​​detection unit: used to detect the sludge conveying speed inside the rotary drying drum; Gas detection unit: Used to detect key parameters of the drying gas in the inlet area of ​​the rotary dryer; Temperature detection unit: used to detect the temperature at different temperature measuring points on the outer surface of the rotary drying cylinder.

[0009] Preferably, the intelligent computing and analysis module includes: Temperature Analysis Unit 1: Used to determine the temperature distribution unevenness of each drying zone by combining the temperatures at different temperature measurement points in each drying zone of the rotary drying cylinder; the rotary drying cylinder is divided into several drying zones along its length. Judgment Unit: When the temperature distribution unevenness does not meet the corresponding preset unevenness range, it is determined that the rotation speed of the rotary drying drum needs to be adjusted. If the moisture content after drying does not meet the set moisture content range after drying, first determine whether the rotary drying drum speed needs to be adjusted. If the rotary drying drum speed needs to be adjusted, first adjust the rotary drying drum speed, and then determine whether the screw conveyor component speed needs to be adjusted based on the moisture content of the qualified dried sludge after adjusting the rotary drying drum speed. Adjustment Analysis Unit: When it is necessary to adjust the rotation speed of the rotary dryer, the rotation speed adjustment strategy of the rotary dryer is determined based on the temperature distribution unevenness; when it is necessary to adjust the rotation speed of the screw conveyor assembly, the rotation speed adjustment strategy of the screw conveyor assembly is determined based on the moisture content deviation of the dried sludge after the rotation speed of the rotary dryer is adjusted to be qualified.

[0010] Preferably, the strategy for adjusting the rotational speed of the rotary drying drum based on the temperature distribution non-uniformity includes: The target adjustment direction of the rotational speed is determined based on the unevenness of temperature distribution; Adjust the rotation speed according to the target direction of the rotation speed until the rotation speed of the rotary drying cylinder is adjusted to meet the requirements.

[0011] Preferably, determining the target adjustment direction of the rotational speed based on the temperature distribution non-uniformity includes: Identify the target drying area with abnormal temperature distribution unevenness, determine the first proportion of the temperature distribution unevenness of the target drying area that exceeds the corresponding preset unevenness range, and filter the largest first proportion; and determine the maximum temperature difference of the target drying area corresponding to the largest first proportion. If the first ratio is greater than the preset ratio and the maximum temperature difference is greater than the preset temperature difference, then the target adjustment direction is determined to be to increase the rotation speed of the rotary drying drum; otherwise, the target adjustment direction is to decrease the rotation speed of the rotary drying drum.

[0012] Preferably, the key parameters of the drying gas in the air inlet area of ​​the rotary dryer include flow rate and gas pressure; The intelligent computing and analysis module also includes: Cyclone Analysis Unit: During the initial measurement time and batch drying process of sludge, the corresponding actual cyclone characteristic parameters are determined based on the key parameters of the drying gas in the air inlet area of ​​the rotary dryer and the rotation speed of the rotary dryer. Alarm unit: An alarm is triggered when the actual swirl characteristic parameters do not meet the process range of the swirl characteristic parameters.

[0013] Preferably, the intelligent computing and analysis module also includes: Calculation Unit 1: Used to determine the initial speed adjustment amount when adjusting the speed based on the target adjustment direction of the speed, based on the actual swirl characteristic parameters corresponding to the initial measurement time and the temperature non-uniformity detected within the initial measurement time; When the swirl characteristic parameters after the initial speed adjustment amount meet the process range of the swirl characteristic parameters, the test control module first performs the first speed adjustment of the rotary drying cylinder based on the initial speed adjustment amount. When the speed adjustment of the rotary drying cylinder is not qualified after the first speed adjustment, the speed is adjusted in a gradient based on the target adjustment direction of the speed until the speed adjustment of the rotary drying cylinder is qualified.

[0014] Preferably, the rotary drying cylinder is divided into several drying zones along its length; The storage module also stores the baseline viscosity and baseline bulk density of each type of sludge, as well as the actual sludge-dual-speed synergy coefficient range for process settings. The control system also includes: Sludge detection module: used to detect the viscosity and bulk density of the current sludge; Combined analysis module: used to determine the speed range of the screw conveyor component based on the sludge detection module, the speed of the rotary dryer after the speed adjustment is qualified, the current viscosity and bulk density of the sludge, and the setting of the sludge-dual speed coordination coefficient range; The screening module determines the test speed of the screw conveyor component by combining the speed range of the screw conveyor component and the speed of the benchmark screw conveyor component; the test control module also controls the working test duration of the drying equipment by combining the speed of the test screw conveyor component, the speed of the rotary drying cylinder after adjustment, and the benchmark air intake flow. Rotation speed analysis and determination module: used to determine the final rotation speed of the screw conveyor assembly by combining the temperature at different temperature measurement points in each drying zone of the drying cylinder during the test duration and the rotation speed of the test screw conveyor assembly. When drying sludge in batches, the operation of the screw conveyor assembly is controlled based on the final design speed of the screw conveyor assembly.

[0015] Preferably, the rotational speed analysis and determination module includes: Temperature Analysis Unit 2: Based on the temperature at different temperature measurement points in each drying zone of the rotary drying drum during the test period, determine the average temperature of each drying zone; Construction and screening unit: Construct an average temperature sequence in the direction from feed to discharge of the rotary dryer, and construct a temperature gradient sequence based on the average temperature sequence in the direction from feed to discharge of the rotary dryer; screen sub-temperature gradient sequences that are continuous within a preset range of the maximum temperature gradient, and determine the average temperature gradient of the sub-temperature gradient sequences. Combined analysis unit: Determine the actual spiral drying gradient efficiency coefficient by combining the sludge conveying speed corresponding to the test duration and the average value of the temperature gradient of the sub-temperature gradient sequence; Rotation speed analysis unit: used to determine the actual spiral drying gradient efficiency coefficient, the target spiral conveyor component rotation speed adjustment ratio corresponding to the moisture content deviation corresponding to the actual test duration, and the final set spiral conveyor component rotation speed based on the preset spiral drying gradient efficiency coefficient-moisture content deviation-screw conveyor component rotation speed relationship.

[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0017] Compared with the prior art, the present invention has the following beneficial effects: By calculating the uneven temperature distribution in the drying zone and dynamically adjusting the rotation speed of the rotary drying drum, the problem of "local over-drying / under-drying" caused by uneven temperature distribution inside the drum in traditional drying equipment has been solved.

[0018] The storage module pre-stores the baseline parameters of different sludge types (municipal, industrial, chemical, etc.), and combined with the dynamic adjustment of intelligent computing analysis, it can adapt to the characteristics of different sludge types, such as viscosity and initial moisture content: for example, sludge with high viscosity can avoid clogging by reducing the speed of the screw conveyor.

[0019] First, by debugging experimental samples and storing benchmark parameters, an initial standard template is established for each type of sludge to avoid blind debugging without a basis. Then, by collecting data during the initial measurement period, conducting intelligent calculation and analysis, and making dynamic adjustments, the control parameters are precisely adjusted for the current sludge based on the benchmark.

[0020] Traditional drying processes often involve adjusting the airflow and rotation speed simultaneously, which can easily lead to parameter interference and process control failure. This invention uses a fixed airflow control logic to first optimize temperature uniformity by adjusting the rotation speed of the rotary drying cylinder, and then adjust the screw conveyor speed to match the moisture content. This avoids coupling interference from multiple parameters, making the control logic simpler, significantly reducing debugging difficulty, and allowing even novice maintenance personnel to quickly master the operation.

[0021] This invention prioritizes temperature distribution uniformity as the core indicator for adjustment, and adjusts the rotation speed of the rotary drying drum accordingly. Temperature uniformity is a prerequisite for uniform sludge drying. By first addressing the core issue of uneven temperature distribution within the drum, and then matching the moisture content with the screw conveyor speed, the priority of parameter adjustment becomes clearer. This fundamentally avoids the process defects of local over-drying / under-drying, and improves the uniformity of moisture content in the dried sludge.

[0022] Compared to adjusting the intake airflow (which requires significant fluctuations to affect temperature), the control logic of this invention is more precise and efficient, shortens the response time of parameter adjustments, and greatly improves the timeliness of process adjustments.

[0023] If different types of heat sources need to be switched on-site (such as switching from power plant waste heat to boiler waste heat), the traditional method requires readjusting the matching relationship between flow rate and rotation speed; the fixed flow rate of the present invention is a standardized air intake parameter, which only needs to call the reference rotation speed parameter of the corresponding sludge, and then fine-tune the rotation speed through intelligent calculation and analysis to quickly adapt to the new heat source. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Fig. 1 This is a schematic diagram of the control system of the present invention; Fig. 2 This is a schematic diagram of the device of the present invention. Detailed Implementation

[0025] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0026] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions and features of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0027] The present invention provides the following embodiments: Example 1: This embodiment of the invention provides a control system for a rotary sludge waste heat drying device, such as... Figs. 1-2 As shown, it includes: The control system includes: The comprehensive testing module is used to detect key parameters of sludge before and after drying, sludge conveying speed inside the rotary dryer, key parameters of drying gas in the air inlet area of ​​the rotary dryer, and temperature at different temperature measurement points on the outer surface of the rotary dryer. Storage module: Stores the baseline drying control parameters for each type of sludge; the drying control parameters include: air inlet flow rate, screw conveyor assembly speed, and rotary drying drum speed; Test control module: Used to control the initial test duration of the drying equipment before mass production, based on the current sludge type's baseline drying control parameters (the pre-test time for the drying equipment to operate according to the baseline parameters before mass production; the time taken for the drying equipment to operate under the current sludge type's baseline drying control parameters until the amount of sludge output by the drying equipment reaches the preset sludge amount); and to control the operation of the comprehensive testing module within the initial test duration; Intelligent computing and analysis module: used to jointly analyze the detection results of the comprehensive detection module within the initial test period, to determine whether the speed of the screw conveyor component needs to be adjusted and whether the speed of the rotary drying cylinder needs to be adjusted, and when it is determined that the corresponding drying control parameters need to be adjusted, to determine the corresponding adjustment strategy; Main control module: It communicates with the integrated detection module, storage module, test control module and intelligent calculation and analysis module respectively. It receives the adjustment strategy output by the intelligent calculation and analysis module and directly sends it to the execution unit of the drying equipment (screw conveyor assembly, drying cylinder rotation drive assembly and drying air intake assembly) to complete the parameter adjustment.

[0028] The intelligent components of the rotary sludge waste heat drying equipment include: a screw conveyor assembly, a drying cylinder rotary drive assembly, and a drying air intake assembly (which may include an air intake pipe and an air intake valve thereon).

[0029] Key parameters of the sludge include: the moisture content of the sludge; the drying air intake assembly is used to input drying gas into the air intake area of ​​the rotary drying cylinder.

[0030] The integrated testing module includes: Sludge testing unit: used to detect key parameters of sludge before and after drying; Speed ​​detection unit: used to detect the sludge conveying speed inside the rotary drying drum; Gas detection unit: Used to detect key parameters of the drying gas in the inlet area of ​​the rotary dryer; Temperature detection unit: used to detect the temperature at different temperature measuring points on the outer surface of the rotary drying cylinder.

[0031] The intelligent computing and analysis module includes: Temperature analysis unit: used to determine the temperature distribution unevenness of each drying zone by combining the temperatures at different temperature measurement points in each drying zone of the rotary drying cylinder; the rotary drying cylinder is divided into several drying zones along its length. Judgment Unit: When the temperature distribution unevenness does not meet the corresponding preset unevenness range, it is determined that the rotation speed of the rotary drying drum needs to be adjusted. If the moisture content after drying does not meet the set moisture content range after drying, first determine whether the rotary drying drum speed needs to be adjusted. If the rotary drying drum speed needs to be adjusted, first adjust the rotary drying drum speed, and then determine whether the screw conveyor component speed needs to be adjusted based on the moisture content of the qualified dried sludge after adjusting the rotary drying drum speed. Adjustment Analysis Unit: When it is necessary to adjust the rotation speed of the rotary dryer, the rotation speed adjustment strategy of the rotary dryer is determined based on the temperature distribution unevenness; when it is necessary to adjust the rotation speed of the screw conveyor assembly, the rotation speed adjustment strategy of the screw conveyor assembly is determined based on the moisture content deviation of the dried sludge after the rotation speed of the rotary dryer is adjusted to be qualified.

[0032] The storage module is the "database" of this control system. Its core function is to store the "baseline drying control parameters" corresponding to different types of sludge in advance. Because the drying characteristics (moisture content, viscosity, etc.) of different sludge (such as municipal sludge and industrial sludge) are very different, different operating parameters need to be matched to achieve the ideal drying effect.

[0033] For each type of sludge, a batch of experimental samples will be selected for drying tests before the first batch drying. By adjusting the air intake flow rate, the speed of the screw conveyor component, and the speed of the rotary drying cylinder, the drying effect of the samples (such as moisture content and drying uniformity) will be adjusted until the process requirements are met. At this time, the corresponding set of operating parameters will be stored in the storage module as the "benchmark drying control parameters" for subsequent drying of this type of sludge. Inlet air flow rate: refers to the flow rate of drying gas introduced into the inlet area of ​​the rotary dryer (affecting drying efficiency and energy consumption). Screw conveyor rotation speed: controls the conveying speed of sludge in the rotary drying drum (determines the sludge drying residence time); Rotary drying drum rotation speed: affects the uniformity of sludge agitation inside the drying drum (related to temperature distribution and drying uniformity); First, obtain the average temperature value of each temperature measuring point within the initial measurement period; the current temperature distribution unevenness in the drying area is: (maximum value of the average temperature value of all temperature measuring points - minimum value of the average temperature value of all temperature measuring points) ÷ arithmetic mean of the average temperature value of all temperature measuring points. The preset unevenness range for each drying zone is the allowable unevenness range for the corresponding drying zone (e.g., less than or equal to 0.05). Rotary sludge waste heat drying equipment, such as Fig. 2 As shown, the equipment includes a rotary drying cylinder 1 and a screw conveyor assembly 2. The working principle of the equipment is as follows: the screw conveyor assembly 2 transports the sludge to be dried into the rotary drying cylinder 1, and at the same time, the drying air inlet assembly sends waste heat into the rotary drying cylinder 1; the drying cylinder rotation drive assembly drives the rotary drying cylinder 1 to rotate. During the rotation, the sludge is repeatedly scattered and turned by the rotary drying cylinder 1, and fully contacts the waste heat in the rotary drying cylinder 1 to achieve moisture evaporation; finally, the dried sludge is discharged from the discharge end of the rotary drying cylinder 1 by the rotation and screw pushing action, completing the drying process.

[0034] The beneficial effects of the above technical solution are as follows: By calculating the uneven temperature distribution in the drying zone and dynamically adjusting the rotation speed of the rotary drying drum, the problem of "local over-drying / under-drying" caused by uneven temperature distribution inside the drum in traditional drying equipment has been solved.

[0035] The storage module pre-stores the baseline parameters of different sludge types (municipal, industrial, chemical, etc.), and combined with the dynamic adjustment of intelligent computing analysis, it can adapt to the characteristics of different sludge types, such as viscosity and initial moisture content: for example, sludge with high viscosity can avoid clogging by reducing the speed of the screw conveyor.

[0036] First, by debugging experimental samples and storing benchmark parameters, an initial standard template is established for each type of sludge to avoid blind debugging without a basis. Then, by collecting data during the initial measurement period, conducting intelligent calculation and analysis, and making dynamic adjustments, the control parameters are precisely adjusted for the current sludge based on the benchmark.

[0037] Traditional drying processes often involve adjusting the airflow and rotation speed simultaneously, which can easily lead to parameter interference and process control failure. This invention uses a fixed airflow control logic to first optimize temperature uniformity by adjusting the rotation speed of the rotary drying cylinder, and then adjust the screw conveyor speed to match the moisture content. This avoids coupling interference from multiple parameters, making the control logic simpler, significantly reducing debugging difficulty, and allowing even novice maintenance personnel to quickly master the operation.

[0038] This invention prioritizes temperature distribution uniformity as the core indicator for adjustment, and adjusts the rotation speed of the rotary drying drum accordingly. Temperature uniformity is a prerequisite for uniform sludge drying. By first addressing the core issue of uneven temperature distribution within the drum, and then matching the moisture content with the screw conveyor speed, the priority of parameter adjustment becomes clearer. This fundamentally avoids the process defects of local over-drying / under-drying, and improves the uniformity of moisture content in the dried sludge.

[0039] Compared to adjusting the intake airflow (which requires significant fluctuations to affect temperature), the control logic of this invention is more precise and efficient, shortens the response time of parameter adjustments, and greatly improves the timeliness of process adjustments.

[0040] If different types of heat sources need to be switched on-site (such as switching from power plant waste heat to boiler waste heat), the traditional method requires readjusting the matching relationship between flow rate and rotation speed; the fixed flow rate of the present invention is a standardized air intake parameter, which only needs to call the reference rotation speed parameter of the corresponding sludge, and then fine-tune the rotation speed through intelligent calculation and analysis to quickly adapt to the new heat source.

[0041] Example 2, based on Example 1, includes a strategy for adjusting the rotational speed of the rotary drying drum based on temperature distribution unevenness, comprising: The target adjustment direction of the rotational speed is determined based on the unevenness of temperature distribution; Adjust the rotation speed based on the target adjustment direction (it can be adjusted by gradient according to the determined direction, or by the method of Examples 3 and 4) until the rotation speed of the rotary drying cylinder is adjusted to meet the requirements (the temperature distribution unevenness of all drying zones does not exceed the corresponding preset unevenness range).

[0042] Optionally, determining the target adjustment direction of the rotational speed based on the temperature distribution non-uniformity includes: Identify the target drying area with abnormal temperature distribution unevenness (temperature distribution unevenness exceeds the corresponding preset unevenness range), determine the first proportion of the temperature distribution unevenness of the target drying area exceeding the corresponding preset unevenness range (first proportion = (actual unevenness of the target drying area - upper limit of the corresponding preset unevenness range) ÷ upper limit of the corresponding preset unevenness range), and select the largest first proportion; and determine the maximum temperature difference of the same target drying area corresponding to the largest first proportion (the maximum value of the average temperature detection value of the temperature measurement point of the target drying area corresponding to the largest first proportion within the initial measurement period - the minimum value of the average temperature detection value of the temperature measurement point of the target drying area corresponding to the largest first proportion); If the first ratio is greater than the preset ratio (ranging from 5% to 10%) and the maximum temperature difference is greater than the preset temperature difference (ranging from 5℃ to 10℃), then the target adjustment direction is determined to be to increase the rotation speed of the rotary drying drum; otherwise, the target adjustment direction is to decrease the rotation speed of the rotary drying drum.

[0043] Optionally, the strategy for adjusting the speed of the screw conveyor assembly to determine the moisture content deviation of the dried sludge after the rotary dryer speed adjustment is qualified includes: After the rotary drying drum is properly adjusted (the temperature distribution unevenness of all drying zones does not exceed the corresponding preset unevenness range), the moisture content deviation after drying at the rotation speed determines the direction of the screw conveyor assembly rotation speed adjustment. Based on the direction of the screw conveyor assembly rotation speed adjustment, the rotation speed of the screw conveyor assembly is adjusted until the moisture content deviation after drying meets the requirements (this embodiment can be used to determine this, or the methods of embodiments 5 and 6 can be used to determine this).

[0044] Moisture content deviation after drying = Actual moisture content after drying - Ideal moisture content after drying; If the deviation is positive (sludge is not completely dry): it means that the residence time of the sludge in the drying drum is too short, and the speed of the screw conveyor component needs to be reduced (to make the sludge move slower and increase the drying time). If the deviation is negative (sludge is over-dried): it means that the sludge stays in the drying drum for too long, and the speed of the screw conveyor component needs to be increased (to make the sludge move faster and reduce the drying time).

[0045] The rotation speed of the screw conveyor can be adjusted in a determined direction by gradient adjustment (e.g., step size 0.5 r / min, adapted to the actual rotation speed range of the screw conveyor). The moisture content of the dried sludge is checked after each adjustment until the deviation falls within the preset qualified range.

[0046] The beneficial effects of the above technical solution are as follows: By using the dual quantitative conditions of "first proportion (the extent of non-uniformity exceeding the standard) + maximum temperature difference (temperature fluctuation within the zone)" to replace experience-based judgment, the direction of "increasing / decreasing the cylinder speed" becomes more objective, avoiding the blindness of subjective parameter adjustment.

[0047] First, by adjusting the drum rotation speed, the temperature distribution in the drying zone is made more uniform (solving the problem of uneven heating of sludge); then, by adjusting the rotation speed of the screw conveyor component, the residence time of sludge in the drum is matched, so that "uniform heat supply" and "sufficient drying time" are precisely matched, which avoids the problem of "uniform temperature but too short residence time leading to insufficient sludge drying" and also eliminates the drying effect defects of "sufficient residence time but uneven temperature causing local over-drying / under-drying".

[0048] Example 3: Based on Example 1 or 2, the key parameters of the drying gas in the air inlet area of ​​the rotary drying cylinder include flow rate and gas pressure. The intelligent computing and analysis module also includes: Cyclone Analysis Unit: During the initial measurement period and the sludge batch drying process (periodic cyclone analysis is performed), the corresponding actual cyclone characteristic parameters are determined based on the key parameters of the drying gas in the air inlet area of ​​the rotary dryer and the rotation speed of the rotary dryer. Alarm unit: An alarm is triggered when the actual swirl characteristic parameters do not meet the process range of the swirl characteristic parameters.

[0049] Swirl characteristic parameters = (rotary drying cylinder rotation speed × flow velocity of dry gas in the inlet area of ​​the rotary drying cylinder × radius of the rotary drying cylinder) ÷ (gas pressure of dry gas in the inlet area of ​​the rotary drying cylinder). Rotary drying drum rotation speed × air inlet area of ​​rotary drying drum × radius of rotary drying drum: The linear velocity of the rotary drying drum directly determines the intensity of sludge dispersion (the greater the linear velocity, the more fully the sludge is dispersed and the higher the dispersion; linear velocity is the rotation speed of the rotary drying drum × radius of the rotary drying drum); the air velocity of the drying gas determines the flow intensity of the hot airflow; the greater the product of the two, the higher the contact area and frequency between the hot airflow and the dispersed sludge, and the faster the water evaporation rate. The air pressure of the drying gas in the air inlet area of ​​the rotary dryer: characterizes the "constraint resistance of airflow-sludge contact". The higher the gas pressure, the smaller the intermolecular distance, the weaker the flow of hot airflow, which will weaken the swirling effect on sludge dispersion and mixing, and reduce the uniformity of contact between hot airflow and sludge. The larger the swirling characteristic parameters, the stronger the promoting effect of swirling on the direct contact between hot airflow and sludge; The swirl characteristic parameter process range (which can be 0.3 to 3 in one embodiment) refers to the parameter range that allows the "rotating and dispersing sludge + hot airflow" in the drying cylinder to achieve the ideal contact effect. When the swirl characteristic parameter falls within this range, the "rotation-airflow synergistic driving force" and "air pressure constraint resistance" will reach a balance: neither excessive driving force will cause airflow turbulence (avoiding sludge being blown away locally and leaving the effective drying zone), nor excessive resistance will restrict airflow (avoiding insufficient contact between hot airflow and sludge, resulting in low drying efficiency). Ultimately, it can ensure uniform contact between hot airflow and the dispersed sludge, achieving a highly efficient and stable direct drying effect. This range needs to be determined by combining actual equipment operating condition tests (testing the sludge drying uniformity and moisture removal rate under different parameters).

[0050] The unit of rotational speed of the reference rotary drying drum is r / s; The flow rate of the drying gas in the inlet area of ​​the rotary drying cylinder, measured during the initial test period, is expressed in m / s. The pressure of the drying gas in the air inlet area of ​​the rotary drying cylinder, measured within the initial test period, is in MPa. The radius of the rotary drying cylinder is measured in meters (m).

[0051] The beneficial effects of the above technical solution are as follows: By using the swirling characteristic parameter range, the sludge dispersion intensity (linear velocity) and the hot airflow intensity (flow velocity) are matched to form a synergistic driving force, while the air pressure is used to constrain the risk of airflow turbulence. When the swirl parameters are within the process range, the sludge will not be blown away from the effective drying area by the airflow due to excessive driving force (under-drying), nor will the hot airflow penetration in the sludge accumulation area be poor due to insufficient airflow (local overheating and coking). As a result, the moisture content deviation of the entire batch of sludge is reduced, and the drying uniformity is significantly better than that of the process without swirl control.

[0052] Periodic cyclone analysis enables early warning: Cyclone parameters are periodically monitored during the initial measurement period and batch drying of sludge. Combined with the alarm unit, abnormalities deviating from the range can be identified in a timely manner to avoid large-scale uneven drying caused by the accumulation of cyclone problems and reduce the risk of process failure.

[0053] Example 4, based on Example 3, further includes the following intelligent computing and analysis module: Calculation Unit 1: Used to determine the initial speed adjustment amount when adjusting the speed based on the target adjustment direction of the speed, based on the actual swirl characteristic parameters corresponding to the initial measurement time and the temperature non-uniformity detected within the initial measurement time; An alarm will be triggered if the swirl characteristic parameters adjusted according to the initial speed adjustment do not meet the process range of the swirl characteristic parameters. When the swirl characteristic parameters after the initial speed adjustment amount meet the process range of the swirl characteristic parameters, the test control module first performs the first speed adjustment of the rotary drying cylinder based on the initial speed adjustment amount. When the speed adjustment of the rotary drying cylinder is not qualified after the first speed adjustment, the speed is adjusted in a gradient based on the target adjustment direction of the speed until the speed adjustment of the rotary drying cylinder is qualified.

[0054] Initial speed adjustment = Limitation ratio corresponding to the swirl limitation coefficient × (Maximum value of temperature non-uniformity detected within the initial measurement period - Median of the allowable temperature non-uniformity range of the drying zone corresponding to the maximum value of temperature non-uniformity detected within the initial measurement period) × Speed ​​adjustment correction coefficient × Unit speed.

[0055] Swirl limiting coefficient = |(actual swirl characteristic parameter - target limit corresponding to the process range of swirl characteristic parameter) ÷ median of the process range of swirl characteristic parameter|; the limiting ratio corresponding to the swirl limiting coefficient takes a value greater than 0 and less than 1 (for example, if the swirl limiting coefficient = 0.2, the limiting ratio corresponding to the swirl limiting coefficient is 0.3). The target limit corresponding to the process range of cyclone characteristic parameters is the limit of the process range of cyclone characteristic parameters that is approached after adjusting the direction according to the target rotation speed of the rotary drying cylinder; an alarm needs to be triggered when the cyclone limitation coefficient is 0. The unit speed is the basic speed adjustment range with dimensions. The minimum speed range that the equipment can stably execute can be selected based on the actual speed regulation capability of the equipment. When the actual swirling parameters deviate from the process range, the swirling limit coefficient reflects the degree of deviation; when the actual swirling parameters do not deviate from the process range, the speed adjustment range is limited according to the degree of closeness between the actual swirling parameters and the limit, and the formula can still drive the speed adjustment through the temperature non-uniformity difference.

[0056] Rotation speed adjustment correction coefficient: obtained through a linkage test of "airflow parameters - drying cylinder temperature - rotation speed adjustment": with a fixed range of swirling characteristic parameters, under different airflow conditions (flow rate, air pressure), the temperature distribution in multiple areas of the drying cylinder is continuously monitored, and the "swirl stability improvement rate" and "temperature non-uniformity reduction rate" corresponding to different rotation speed adjustment ranges are tested. A correction coefficient is selected that "both pushes the temperature non-uniformity as close as possible to the adjustment target (after adjustment, the median of the allowable temperature non-uniformity range of the drying zone corresponding to the maximum temperature non-uniformity is less than a preset value, which is the maximum deviation from the median value allowed by the process (usually taken as 1 / 4 to 1 / 2 of the allowable range width, for example, when the range width is 4%, the preset value is taken as 1% to 2%), and ensures that the swirling characteristic parameters do not exceed the corresponding limits of the process range"; its value range is usually 0.9 to 1.2.

[0057] The beneficial effects of the above technical solution are as follows: The "swirling limit coefficient" quantifies the relative degree of swirling deviation from the process range, and the "temperature non-uniformity difference" quantifies the abnormal amplitude of the drying thermal environment. This transforms vague process control requirements into calculable parameter operations and establishes a strong correlation between the speed adjustment range and the degree of swirling deviation and temperature exceedance. Compared to experience-based adjustments, the accuracy of speed adjustment is significantly improved. First, the cyclone is brought back to the process range through an initial adjustment. Then, the rotation speed is gradually optimized based on the equipment's speed regulation capability. Finally, a closed-loop control is formed that ensures stable cyclone flow, uniform thermal environment, and efficient drying process, achieving rapid and precise adjustment.

[0058] Example 5: Based on any one of Examples 1-4, the rotary drying cylinder is divided into several drying zones along its length. The storage module also stores the baseline viscosity and baseline bulk density of each type of sludge, as well as the actual sludge-dual-speed synergy coefficient range for process settings. The control system also includes: Sludge detection module: used to detect the viscosity and bulk density of the current sludge; Combined analysis module: used to determine the speed range of the screw conveyor component based on the sludge detection module, the speed of the rotary dryer after the speed adjustment is qualified, the current viscosity and bulk density of the sludge, and the setting of the sludge-dual speed coordination coefficient range; The screening module determines the test speed of the screw conveyor component by combining the speed range of the screw conveyor component and the speed of the benchmark screw conveyor component; the test control module also controls the working test duration of the drying equipment by combining the speed of the test screw conveyor component, the speed of the rotary drying cylinder after adjustment, and the benchmark air intake flow. Rotation speed analysis and determination module: used to determine the final rotation speed of the screw conveyor assembly by combining the temperature at different temperature measurement points in each drying zone of the drying cylinder during the test duration and the rotation speed of the test screw conveyor assembly. When drying sludge in batches, the operation of the screw conveyor assembly is controlled based on the final design speed of the screw conveyor assembly.

[0059] Actual sludge-dual-speed synergy coefficient = ; ρ represents the current bulk density of the sludge; h represents the unit thickness. The angular velocity corresponding to the rotational speed of the rotary drying drum after the rotational speed has been adjusted to be within acceptable limits; The rotational speed of the screw conveyor assembly; It reflects the equivalent centrifugal force state of sludge and is used to characterize the ability of sludge to be thrown off the cylinder wall by the rotation of the drying cylinder; It reflects the equivalent adhesion resistance state between sludge and cylinder wall. The adhesion resistance is positively correlated with sludge viscosity and helical shearing action, and characterizes the resistance intensity of sludge adhering to the cylinder wall. The sludge-dual-speed synergy coefficient range is set as follows: it is a process threshold range based on the sludge's baseline characteristics (viscosity, bulk density), corresponding to the "reasonable ratio range of equivalent sludge centrifugal force to equivalent adhesion resistance". When the actual sludge-dual-speed synergy coefficient is within this range, the sludge can avoid clumping against the wall due to excessive adhesion resistance (excessive adhesion to the cylinder wall will affect the wall heat exchange efficiency), and it can also avoid being thrown off too quickly due to excessive centrifugal force (leaving the effective heat exchange area). It can maintain a uniform distribution and stable contact with the heat exchange wall in the drying cylinder, ensuring the effect of indirect drying. If the coefficient exceeds the range, the drying cylinder speed and other parameters need to be adjusted to ensure drying efficiency and effect.

[0060] The test duration can be the same as the initial test duration; The deviation of moisture content after drying corresponding to the test duration = the actual moisture content after drying corresponding to the test duration - the ideal moisture content after drying; If the deviation is positive (sludge is not completely dry): it means that the residence time of the sludge in the drying drum is too short, and the speed of the screw conveyor component needs to be reduced (to make the sludge move slower and increase the drying time). If the deviation is negative (sludge is over-dried): it means that the sludge stays in the drying drum for too long, and the speed of the screw conveyor component needs to be increased (to make the sludge move faster and reduce the drying time).

[0061] When the speed of the reference screw conveyor assembly is within the speed range of the screw conveyor assembly, the speed of the reference screw conveyor assembly is determined to be the speed of the test screw conveyor assembly. When the reference screw conveyor speed is not within the screw conveyor speed range, and the screw conveyor speed adjustment direction based on the screw conveyor speed range is inconsistent with the screw speed adjustment direction based on the moisture content deviation, the second alarm module will issue an alarm, and the matching between sludge characteristics and process parameters should be checked first. When the reference screw conveyor speed is not within the screw conveyor speed range, and the screw conveyor speed adjustment direction based on the screw conveyor speed range (i.e., the direction that brings the reference speed closer to the range, such as the speed reduction required if the reference speed is higher than the upper limit of the screw conveyor speed range) is consistent with the screw speed adjustment direction based on the moisture content deviation, select the value closest to the reference speed from the screw conveyor speed range and set it as the test screw conveyor speed. The beneficial effects of the above technical solution are as follows: Traditional drying methods rely on fixed rotation speed and temperature, which can easily lead to uneven drying due to fluctuations in sludge viscosity and bulk density. This solution uses a sludge detection module and a dual rotation speed coordination coefficient to achieve a customized rotation speed range for each batch of sludge, allowing the drying process to match the sludge characteristics in real time and solving the drying compatibility problem for different batches of sludge (such as municipal sludge / industrial sludge).

[0062] The solution establishes an interlocking relationship between sludge characteristics (viscosity / bulk density), dual-speed rotation synergy coefficient, speed range, and moisture content deviation. This avoids the one-sidedness of adjusting speed solely based on moisture content (for example, if the moisture content is below the standard, instead of blindly reducing the speed, it first verifies whether the speed is within the process range); it also avoids the mechanical nature of adjusting parameters solely based on speed range (range adjustments must match the actual drying requirements of the sludge). This interlocking logic ensures that each decision is supported by multiple parameters, significantly reducing the probability of "misjudgment-based adjustments."

[0063] Example 6, based on Example 5, the rotational speed analysis and determination module includes: Temperature Analysis Unit 2: Based on the temperature at different temperature measurement points in each drying zone of the rotary drying drum during the test period, determine the average temperature of each drying zone; Construction and screening unit: Construct an average temperature sequence in the direction from feed to discharge of the rotary dryer, and construct a temperature gradient sequence based on the average temperature sequence in the direction from feed to discharge of the rotary dryer; screen sub-temperature gradient sequences that are continuous within a preset range of the maximum temperature gradient, and determine the average temperature gradient of the sub-temperature gradient sequences. Combined analysis unit: Determine the actual spiral drying gradient efficiency coefficient by combining the sludge conveying speed corresponding to the test duration and the average value of the temperature gradient of the sub-temperature gradient sequence; Rotation speed analysis unit: used to determine the actual spiral drying gradient efficiency coefficient, the target spiral conveyor component rotation speed adjustment ratio corresponding to the moisture content deviation corresponding to the actual test duration, and the final set spiral conveyor component rotation speed based on the preset spiral drying gradient efficiency coefficient-moisture content deviation-screw conveyor component rotation speed relationship.

[0064] Specifically: Based on the feeding and discharging direction of the rotary drying drum, it is divided into drying zone 1, drying zone 2, ... drying zone n; Average temperature sequence = [average temperature within the test duration of drying zone 1, average temperature within the test duration of drying zone 2, ..., average temperature within the test duration of drying zone n]; Temperature gradient sequence = [temperature gradients corresponding to drying zone 1 and drying zone 2, temperature gradients corresponding to drying zone 2 and drying zone 3, ..., temperature gradients corresponding to drying zone n-1 and drying zone n]; The temperature gradient between drying zone n-1 and drying zone n = (average temperature of drying zone n during the test time - average temperature of drying zone n-1 during the test time) ÷ (distance between the center of drying zone n and the center of drying zone n-1 along the length of the rotary drying cylinder). The preset range for the maximum temperature gradient is 0.5 to 1 times the maximum temperature gradient; the maximum temperature gradient is the maximum value of the temperature gradient sequence. Spiral drying gradient efficiency coefficient = average temperature gradient of sub-temperature gradient sequence × unit speed ÷ (sludge conveying speed corresponding to test duration × unit temperature). The average temperature gradient of the sub-temperature gradient sequence reflects the heat exchange intensity of the drying zone (the larger the gradient, the higher the heat exchange efficiency), and the sludge shows a better temperature rise from the feed to the discharge direction. The unit temperature is 1℃; the sludge conveying speed is m / s; the unit speed is 1m / s; The spiral drying gradient efficiency coefficient (with a value range of 100 to 200) directly reflects the drying efficiency corresponding to the unit propulsion efficiency and unit temperature benchmark at the current spiral conveying speed. The larger the efficiency coefficient of spiral drying gradient, the more effectively the heat exchange efficiency of the drying zone can be applied to the sludge at the current rotation speed. The higher the "heat utilization efficiency" of sludge drying, the better the drying effect. The smaller the efficiency coefficient of the spiral drying gradient, the worse the match between the current rotation speed and the conveying speed. The heat exchange efficiency has not been effectively converted into drying effect, and the rotation speed needs to be adjusted to optimize the sludge retention time.

[0065] Final screw conveyor assembly speed = Test screw conveyor assembly speed × Target screw conveyor assembly speed adjustment ratio; The deviation of moisture content after drying corresponding to the test duration = the actual moisture content after drying corresponding to the test duration - the ideal moisture content after drying; The preset relationship between the spiral drying gradient efficiency coefficient, moisture content deviation, and spiral conveyor component speed adjustment ratio is: a corresponding rule pre-established based on historical operating data or historical experimental verification data: when the spiral drying gradient efficiency coefficient (the core parameter reflecting drying efficiency) is higher and the moisture content deviation (the difference between the actual moisture content and the target value) is greater, the speed adjustment ratio of the spiral conveyor component will change accordingly.

[0066] For example: the efficiency coefficient of the spiral drying gradient is 160~200, and the moisture content deviation is 5%~8%; the speed adjustment ratio of the spiral conveyor component is 0.8~0.9; The beneficial effects of the above technical solution are as follows: The larger the efficiency coefficient of the spiral drying gradient, the more effectively the heat exchange efficiency of the drying zone can be applied to the sludge at the current rotation speed. The higher the heat utilization efficiency of sludge drying, the better the drying effect. In response to the dynamic fluctuations of sludge moisture, viscosity, particle size and other characteristics, the system can autonomously, quickly and accurately adjust the rotation speed control range through dual feedback of temperature gradient changes and moisture content deviations to ensure the drying effect.

[0067] The average temperature gradient of the sub-temperature gradient sequence directly reflects the heat exchange intensity of the drying zone (the larger the gradient, the higher the heat exchange efficiency). It can clearly indicate whether the temperature rise of the sludge from feed to discharge is good, and the screening of the sub-temperature gradient sequence is to screen the key drying zone with large temperature gradient changes, ensuring the reliability of the average temperature gradient.

[0068] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A control system for a rotary sludge waste heat drying equipment, the drying equipment comprising a rotary drying drum, characterized in that: The control system includes: The comprehensive testing module is used to detect key parameters of sludge before and after drying, sludge conveying speed inside the rotary dryer, key parameters of drying gas in the air inlet area of ​​the rotary dryer, and temperature at different temperature measurement points on the outer surface of the rotary dryer. Storage module: Stores the baseline drying control parameters for each type of sludge; the drying control parameters include: air inlet flow rate, screw conveyor assembly speed, and rotary drying drum speed; Test control module: used to control the initial test duration of the drying equipment based on the current sludge type's baseline drying control parameters before mass production; and to control the operation of the comprehensive testing module within the initial test duration; Intelligent computing and analysis module: used to jointly analyze the detection results of the comprehensive detection module within the initial test period, to determine whether the speed of the screw conveyor component needs to be adjusted and whether the speed of the rotary drying cylinder needs to be adjusted, and when it is determined that the corresponding drying control parameters need to be adjusted, to determine the corresponding adjustment strategy; Main control module: It communicates with the integrated detection module, storage module, test control module and intelligent operation and analysis module respectively. It receives the adjustment strategy output by the intelligent operation and analysis module and directly sends it to the execution unit of the drying equipment to complete the parameter adjustment.

2. The control system for a rotary sludge waste heat drying equipment according to claim 1, characterized in that: The intelligent components of the rotary sludge waste heat drying equipment include: a screw conveyor assembly, a drying cylinder rotary drive assembly, and a drying air intake assembly. Key parameters of the sludge include: the moisture content of the sludge; the drying air intake assembly is used to input drying gas into the air intake area of ​​the rotary drying cylinder.

3. The control system for a rotary sludge waste heat drying equipment according to claim 1, characterized in that: The comprehensive testing module includes: Sludge testing unit: used to detect key parameters of sludge before and after drying; Speed ​​detection unit: used to detect the sludge conveying speed inside the rotary drying drum; Gas detection unit: Used to detect key parameters of the drying gas in the inlet area of ​​the rotary dryer; Temperature detection unit: used to detect the temperature at different temperature measuring points on the outer surface of the rotary drying cylinder.

4. The control system for a rotary sludge waste heat drying equipment according to claim 1, characterized in that: The intelligent computing and analysis module includes: Temperature Analysis Unit 1: Used to determine the temperature distribution unevenness of each drying zone by combining the temperatures at different temperature measurement points in each drying zone of the rotary drying cylinder; the rotary drying cylinder is divided into several drying zones along its length. Judgment Unit: When the temperature distribution unevenness does not meet the corresponding preset unevenness range, it is determined that the rotation speed of the rotary drying drum needs to be adjusted. If the moisture content after drying does not meet the set moisture content range after drying, first determine whether the rotary drying drum speed needs to be adjusted. If the rotary drying drum speed needs to be adjusted, first adjust the rotary drying drum speed, and then determine whether the screw conveyor component speed needs to be adjusted based on the moisture content of the qualified dried sludge after adjusting the rotary drying drum speed. Adjustment Analysis Unit: When it is necessary to adjust the rotation speed of the rotary dryer, the rotation speed adjustment strategy of the rotary dryer is determined based on the temperature distribution unevenness; when it is necessary to adjust the rotation speed of the screw conveyor assembly, the rotation speed adjustment strategy of the screw conveyor assembly is determined based on the moisture content deviation of the dried sludge after the rotation speed of the rotary dryer is adjusted to be qualified.

5. The control system for a rotary sludge waste heat drying equipment according to claim 4, characterized in that: The strategies for adjusting the rotational speed of the rotary drying drum based on temperature distribution non-uniformity include: The target adjustment direction of the rotational speed is determined based on the unevenness of temperature distribution; Adjust the rotation speed according to the target direction of the rotation speed until the rotation speed of the rotary drying cylinder is adjusted to meet the requirements.

6. The control system for a rotary sludge waste heat drying equipment according to claim 5, characterized in that: Determining the target adjustment direction of rotational speed based on temperature distribution non-uniformity includes: Identify the target drying area with abnormal temperature distribution unevenness, determine the first proportion of the temperature distribution unevenness of the target drying area that exceeds the corresponding preset unevenness range, and filter the largest first proportion; and determine the maximum temperature difference of the target drying area corresponding to the largest first proportion. If the first ratio is greater than the preset ratio and the maximum temperature difference is greater than the preset temperature difference, then the target adjustment direction is determined to be to increase the rotation speed of the rotary drying drum; otherwise, the target adjustment direction is to decrease the rotation speed of the rotary drying drum.

7. The control system for a rotary sludge waste heat drying equipment according to claim 5, characterized in that: The key parameters for the drying gas in the inlet area of ​​the rotary dryer include flow rate and gas pressure; The intelligent computing and analysis module also includes: Cyclone Analysis Unit: During the initial measurement time and batch drying process of sludge, the corresponding actual cyclone characteristic parameters are determined based on the key parameters of the drying gas in the air inlet area of ​​the rotary dryer and the rotation speed of the rotary dryer. Alarm unit: An alarm is triggered when the actual swirl characteristic parameters do not meet the process range of the swirl characteristic parameters.

8. The control system for a rotary sludge waste heat drying equipment according to claim 7, characterized in that: The intelligent computing and analysis module also includes: Calculation Unit 1: Used to determine the initial speed adjustment amount when adjusting the speed based on the target adjustment direction of the speed, based on the actual swirl characteristic parameters corresponding to the initial measurement time and the temperature non-uniformity detected within the initial measurement time; When the swirl characteristic parameters after the initial speed adjustment amount meet the process range of the swirl characteristic parameters, the test control module first performs the first speed adjustment of the rotary drying cylinder based on the initial speed adjustment amount. When the speed adjustment of the rotary drying cylinder is not qualified after the first speed adjustment, the speed is adjusted in a gradient based on the target adjustment direction of the speed until the speed adjustment of the rotary drying cylinder is qualified.

9. The control system for a rotary sludge waste heat drying equipment according to claim 1, characterized in that: The rotary drying drum is divided into several drying zones along its length; The storage module also stores the baseline viscosity and baseline bulk density of each type of sludge, as well as the actual sludge-dual-speed synergy coefficient range for process settings. The control system also includes: Sludge detection module: used to detect the viscosity and bulk density of the current sludge; Combined analysis module: used to determine the speed range of the screw conveyor component based on the sludge detection module, the speed of the rotary dryer after the speed adjustment is qualified, the current viscosity and bulk density of the sludge, and the setting of the sludge-dual speed coordination coefficient range; The screening module determines the test speed of the screw conveyor component by combining the speed range of the screw conveyor component and the speed of the benchmark screw conveyor component; the test control module also controls the working test duration of the drying equipment by combining the speed of the test screw conveyor component, the speed of the rotary drying cylinder after adjustment, and the benchmark air intake flow. Rotation speed analysis and determination module: used to determine the final rotation speed of the screw conveyor assembly by combining the temperature at different temperature measurement points in each drying zone of the drying cylinder during the test duration and the rotation speed of the test screw conveyor assembly. When drying sludge in batches, the operation of the screw conveyor assembly is controlled based on the final design speed of the screw conveyor assembly.

10. The control system for a rotary sludge waste heat drying equipment according to claim 9, characterized in that: The speed analysis and determination module includes: Temperature Analysis Unit 2: Based on the temperature at different temperature measurement points in each drying zone of the rotary drying drum during the test period, determine the average temperature of each drying zone; Construction and screening unit: Construct an average temperature sequence in the direction from feed to discharge of the rotary dryer, and construct a temperature gradient sequence based on the average temperature sequence in the direction from feed to discharge of the rotary dryer; screen sub-temperature gradient sequences that are continuous within a preset range of the maximum temperature gradient, and determine the average temperature gradient of the sub-temperature gradient sequences. Combined analysis unit: Determine the actual spiral drying gradient efficiency coefficient by combining the sludge conveying speed corresponding to the test duration and the average value of the temperature gradient of the sub-temperature gradient sequence; Rotation speed analysis unit: used to determine the actual spiral drying gradient efficiency coefficient, the target spiral conveyor component rotation speed adjustment ratio corresponding to the moisture content deviation corresponding to the actual test duration, and the final set spiral conveyor component rotation speed based on the preset spiral drying gradient efficiency coefficient-moisture content deviation-screw conveyor component rotation speed relationship.

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