Anti-bonding regeneration drum for asphalt recycling and control method thereof

Abstract

The application provides an anti-bonding regeneration drum for asphalt recycling and a control method thereof. The anti-bonding regeneration drum comprises a base, a drum body rotatably installed on the base, and a plurality of heating areas divided along an axial direction of the drum body. A plurality of combustion assemblies are arranged along the axial direction of the drum body and correspond to the positions of the heating areas one by one. Each combustion assembly comprises a combustion cover sleeved on an outer wall of the drum body, a combustion nozzle arranged at a bottom of the combustion cover, an opening degree valve arranged on a connecting pipeline of the combustion nozzle and a fuel supply device, a drum wall temperature measuring device, and a flame detector. The regeneration drum provided by the application realizes uniform and stable control of the drum wall temperature through axial partition design and independent and accurate adjustment of fuel supply in each area, thereby effectively preventing the bonding of high RAP content and significantly improving the heat exchange efficiency and production continuity.

Description

Technical Field

[0001] This invention belongs to the field of material recycling technology, specifically relating to an anti-adhesion recycling roller for asphalt hangers and its control method. Background Technology

[0002] With the continuous expansion of road maintenance scale and increasingly stringent environmental protection requirements in my country, the high-volume (typically >40%) recycling of reclaimed asphalt pavement (RAP) has become a key technological direction for the asphalt pavement industry to achieve resource recycling and energy conservation and emission reduction. This technology can significantly reduce the consumption of virgin aggregates and asphalt, lower production costs and carbon emissions, and has both significant economic and environmental benefits, making it an inevitable choice for the sustainable development of the industry.

[0003] However, in the high-content RAP thermal recycling process, the core equipment, the recycling drum, has long faced a serious problem of material adhesion to the drum wall. Because the softening point of aged asphalt in RAP is low, when the drum wall temperature of a traditional recycling drum exceeds its softening critical temperature (approximately 130°C), the asphalt easily softens and adheres to the inner wall of the drum and the surface of the conveying blades. This adhesion layer accumulates and thickens continuously, leading to a reduction in the effective volume of the drum, obstructed material flow, and uneven heating. This severely reduces heat exchange efficiency and production capacity, ultimately forcing frequent equipment shutdowns for manual cleaning, seriously hindering the continuity and economy of production and the quality stability of the recycled mixture. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, the first aspect of the present invention provides an anti-sticking recycling roller for asphalt recycling, comprising: A base on which a cylindrical body is rotatably mounted, the cylindrical body being divided into multiple heating zones along the axial direction; Multiple combustion components are arranged at intervals along the axial direction of the cylinder and correspond one-to-one with the position of the heating zone. Each combustion component includes a combustion hood sleeved on the outer wall of the cylinder, a combustion nozzle located at the bottom of the combustion hood, an adjusting valve located on the connecting pipeline between the combustion nozzle and the fuel supply equipment, a cylinder wall temperature measuring device, and a flame detector.

[0005] According to the technical solution provided by the present invention, the combustion hood has a cylindrical structure, and an annular combustion space is formed between the inner wall of the combustion hood and the outer wall of the cylinder; the combustion nozzle has an arc-shaped structure corresponding to the bottom of the combustion hood.

[0006] According to the technical solution provided by the present invention, the combustion hood is also connected to a chimney, and multiple chimneys are connected in parallel to the main flue gas duct, which is connected to a flue gas treatment device.

[0007] A second aspect of the present invention provides a method for controlling a recycling roller, applied to the anti-adhesion recycling roller described above, the method comprising: After the equipment self-checks and starts, it determines the target cylinder wall temperature corresponding to each heating zone based on the preset initial working conditions and the feeding signal. Real-time measurement of the cylinder wall temperature in each of the heating zones; The measured temperature of the cylinder wall in each of the heating zones is compared with the corresponding target temperature of the cylinder wall to generate an independent temperature deviation signal, and the opening of the corresponding regulating valve is adjusted based on the temperature deviation signal of each heating zone.

[0008] According to the technical solution provided by the present invention, adjusting the opening degree of the corresponding regulating valve based on the temperature deviation signal of each heating zone includes: A pre-established axial thermal coupling model of the cylinder is used as the prediction model; the thermal coupling model describes the thermal dynamic characteristics of each heating zone and the thermal interaction between adjacent zones caused by radiation and convection. Within each control cycle, the temperature deviation signal corresponding to the actual measured temperature gauge of each heating zone is used as the initial state. The prediction model is used to predict the temperature change trajectory of each zone under various valve opening sequences in the next few cycles. With the goal of minimizing the deviation between the predicted future temperature and the target temperature of each cylinder wall, the optimal future valve opening sequence that makes the predicted trajectory optimal from the current moment is solved, and the optimal opening value corresponding to the current moment in the sequence is input to the regulating valve corresponding to each heating zone.

[0009] According to the technical solution provided by the present invention, the pre-established axial thermal coupling model of the cylinder is obtained in the following way: The cylinder is discretized along the axial direction into multiple thermal nodes that correspond one-to-one with the heating area, and a parameter set is defined for each thermal node, including its own heat transfer inertia parameter and the heat interaction coefficient between adjacent nodes. By sequentially performing a step heating experiment with only a single heating zone operating and a coupled heating experiment with adjacent heating zones operating simultaneously, dynamic response data of the cylinder wall temperature in each heating zone are collected, and the specific values ​​of each parameter in the parameter set are identified based on the data. The prediction accuracy of the model is verified using a separate model test set, and the parameter set is stored for later use once the accuracy requirements are met.

[0010] According to the technical solution provided by the present invention, a pressure sensor and a gas concentration sensor are further provided inside the combustion hood; after adjusting the opening of the corresponding regulating valve based on the temperature deviation signal of each heating zone, the method further includes: If the measured temperature of the cylinder wall in each heating zone is lower than the corresponding cylinder wall bonding temperature threshold, and the temperature change rate within the first set time period is less than the set change rate threshold, the measured temperature difference of the cylinder wall in adjacent heating zones is calculated in real time; the cylinder wall bonding temperature threshold corresponding to each heating zone is greater than the target cylinder wall temperature of that heating zone. When the measured temperature difference of the cylinder wall is greater than the set temperature difference threshold, the one with the higher rate of change of cylinder wall temperature in two adjacent heating areas is identified as the suspected abnormal heating area. Obtain the real-time pressure value and gas ratio value inside the combustion hood corresponding to the suspected abnormal heating area; the gas ratio value is the ratio of the real-time oxygen volume concentration to the carbon monoxide volume concentration in the flue gas. When the real-time pressure value deviates from the preset normal pressure range and the gas ratio deviates from the preset normal ratio range, the suspected abnormal heating area is determined to be an abnormal heating area, and a combustion abnormality signal is generated.

[0011] According to the technical solution provided by the present invention, determining that the suspected abnormal heating area is an abnormal heating area when the real-time pressure value deviates from the preset normal pressure range and the gas ratio deviates from the preset normal ratio range includes: If the real-time pressure value is lower than the lower limit of the normal pressure range and the ratio is lower than the lower limit of the normal ratio range, it is determined that the fuel supply is insufficient or the nozzle is partially blocked. If the real-time pressure value is lower than the lower limit of the normal pressure range and the ratio is higher than the upper limit of the normal ratio range, it is determined that the air intake system is leaking or the smoke is being discharged excessively. If the real-time pressure value is higher than the upper limit of the normal pressure range and the ratio is lower than the lower limit of the normal ratio range, it is determined that the air intake system is blocked or the smoke exhaust is not smooth. If the real-time pressure value is higher than the upper limit of the normal pressure range and the ratio is higher than the upper limit of the normal ratio range, it is determined that there is excessive fuel supply or nozzle wear.

[0012] According to the technical solution provided by the present invention, after adjusting the opening degree of the corresponding regulating valve based on the temperature deviation signal of each heating zone, the method further includes: Acquire the flame detection signal of each of the flame detectors, the flame detection signal being used to characterize the combustion state of the flame; When it is determined that any of the heating zones has been extinguished, the combustion component corresponding to that heating zone is re-ignited within a second set time period; If the initial ignition is successful, continue heating the cylinder. If ignition fails, ignition will continue until the cumulative number of failures exceeds the preset number. At that point, the regulating valve corresponding to the heating zone will be closed, and an ignition abnormality signal will be issued.

[0013] According to the technical solution provided by the present invention, after adjusting the opening degree of the corresponding regulating valve based on the temperature deviation signal of each heating zone, the method further includes: The measured temperature of the cylinder wall in each heating zone is continuously sampled to obtain the time-series temperature data of that heating zone. If the temperature time series data shows a temperature fluctuation greater than the set temperature amplitude fluctuation range, and the fluctuation period is equal to the rotation period of the drum, then it is determined that there is a material adhesion problem in the heating area, and an adhesion abnormality signal is generated.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: by dividing the cylinder into multiple independent heating zones along the axial direction and setting combustion components accordingly, precise zoned temperature control is achieved. The combustion nozzle of each zone is equipped with an adjustment valve that can independently and precisely adjust the fuel flow rate, which can control the heating intensity in a targeted manner. The cylinder wall temperature measuring device arranged in each zone provides real-time temperature feedback for closed-loop control, and the flame detector ensures the safety and reliability of the combustion process. At the same time, the support ring sleeved on the outer wall of the cylinder with an outer diameter larger than the combustion hood cooperates with the corresponding drive unit on the base to provide stable rotational support for the cylinder while ensuring the uniformity and continuity of axial heating and transmission of the cylinder under the zoned heating structure. Thus, the overall precise and stable control of the drum wall temperature is achieved, fundamentally suppressing the adhesion phenomenon of high-dosage RAP in the regeneration process, and improving thermal efficiency and production continuity. Attached Figure Description

[0015] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the anti-adhesion recycling roller provided in Example 1; Figure 2 for Figure 1 The diagram shown is a front view of the anti-adhesion recycling roller. Figure 3 Example 2: Flowchart of the control method provided in this example.

[0016] The text labels in the diagram represent: 1. Cylinder body; 2. Combustion hood; 3. Combustion nozzle; 4. Adjustment valve; 5. Cylinder wall temperature measuring device; 6. Flame detector; 7. Ignition gun; 8. Support ring; 9. Chimney. Detailed Implementation

[0017] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] Example 1 As mentioned in the background section, there are technical issues such as... Figure 1 and Figure 2 As shown, this embodiment proposes an anti-sticking recycling roller for asphalt recycling, comprising: A base on which a cylindrical body 1 is rotatably mounted, the cylindrical body 1 being divided into multiple heating zones along the axial direction; Multiple combustion components are arranged at intervals along the axial direction of the cylinder 1 and correspond one-to-one with the position of the heating area. Each combustion component includes a combustion hood 2 sleeved on the outer wall of the cylinder 1, a combustion nozzle 3 located at the bottom of the combustion hood 2, an adjusting valve 4 located on the pipeline connecting the combustion nozzle 3 and the fuel supply equipment, a cylinder wall temperature measuring device 5, and a flame detector 6.

[0020] Specifically, such as Figure 1 and Figure 2 As shown, the anti-adhesion recycling drum provided in this embodiment mainly includes a base, a cylinder 1, multiple combustion components, at least two support rings 8, a drive component, and a control system. The base (not shown in the figure) serves as the installation foundation for the entire device and is typically constructed from welded steel profiles or connected by high-strength bolts. It possesses sufficient rigidity and stability to withstand the weight of the cylinder 1 and the material, as well as the dynamic load during operation. The base is equipped with bearing seats or similar support structures for rotatably mounting the cylinder 1. The cylinder 1 is the core working chamber for heating and regenerating the material. It is typically made of rolled and welded heat-resistant steel plates, and its inner wall can be equipped with lifting blades to lift and scatter the material. To achieve precise temperature zone control, the cylinder 1 is divided into multiple independent heating zones along its axial direction. The number of these heating zones can be designed according to the total length of the cylinder 1 and process requirements, for example, two, three, or more. Multiple combustion components are arranged at intervals along the axial direction of the cylinder 1, corresponding one-to-one with the positions of the heating zones. Each combustion component is responsible for independently heating its corresponding heating zone. Each combustion component includes a combustion hood 2, a combustion nozzle 3, an adjustment valve 4, a cylinder wall temperature measuring device 5, and a flame detector 6.

[0021] A combustion hood 2 is fitted onto the outer wall of the cylinder 1, forming a relatively enclosed combustion space that confines the flame and high-temperature flue gas within, thereby improving thermal efficiency and reducing heat loss. The combustion hood 2 is typically made of heat-resistant and insulating material. Combustion nozzles 3 are located at the bottom of the combustion hood 2 and extend into it, with their nozzle direction facing the outer wall of the cylinder 1. The combustion nozzles 3 are connected to external fuel supply equipment (such as natural gas pipelines, fuel pumps, etc.) via fuel pipelines to inject fuel into the combustion hood 2 and form a flame, directly heating the outer wall of the cylinder 1; each combustion nozzle 3 is equipped with a corresponding ignition gun 7. An adjusting valve 4 is installed on the pipeline connecting the combustion nozzles 3 and the fuel supply equipment. This valve is a precisely adjustable valve (e.g., an electric regulating valve, pneumatic regulating valve, etc.), which, by receiving command signals from the control system, can continuously and precisely adjust the fuel flow to the corresponding combustion nozzle 3, thereby achieving independent and precise control of the heating intensity of a single heating area. A cylinder wall temperature measuring device 5 is used to monitor the outer wall temperature of the corresponding heating area of ​​the cylinder in real time. The device preferably employs a non-contact infrared thermometer, which is installed and fixed at a position that aligns with the cylinder wall of the corresponding heating area, and feeds back the real-time temperature signal to the control system. A flame detector 6 is also installed inside the combustion hood 2 to monitor the flame status of the combustion nozzle 3 in real time, ensuring combustion safety. Once an abnormality such as flameout is detected, a signal can be immediately fed back to the control system to trigger safety protection measures.

[0022] Furthermore, the combustion hood 2 has a cylindrical structure, and an annular combustion space is formed between the inner wall of the combustion hood 2 and the outer wall of the cylinder 1; the combustion nozzle 3 has an arc-shaped structure corresponding to the bottom of the combustion hood 2.

[0023] Specifically, both the cylinder 1 and the combustion hood 2 are cylindrical structures. Therefore, an annular combustion space is formed between the inner wall of the combustion hood 2 and the outer wall of the cylinder 1, so that the heat during combustion can surround the cylinder 1, improving heating efficiency. The combustion nozzle 3 has an arc-shaped structure that matches the outer wall of the combustion hood 2 to ensure uniform contact between the flame and the cylinder 1.

[0024] Furthermore, the anti-adhesion recycling roller also includes at least two support rings 8 and a drive assembly. The at least two support rings 8 are fixedly fitted onto the outer wall of the cylinder 1. Each support ring 8 is positioned between two adjacent combustion hoods 2. Crucially, the outer diameter of the support ring 8 is larger than the outer diameter of the combustion hood 2. This design allows the outer circumferential surface of the support ring 8 to protrude beyond the combustion hood 2, thereby providing an effective frictional contact surface for the drive assembly while preventing interference between the drive assembly and the combustion hood 2. The drive assembly is mounted on the base and includes a drive unit corresponding to each support ring 8. Each drive unit acts on its corresponding support ring 8, driving the cylinder 1 to rotate around its axis through friction. The coordinated operation of multiple drive units ensures the smooth and synchronous rotation of the long cylinder under axial multi-point heating conditions.

[0025] The anti-adhesion recycling drum provided in this embodiment divides the drum body into multiple independent heating zones along the axial direction, and equips each zone with a combustion component and temperature feedback device that can independently and precisely adjust the fuel quantity, thereby achieving refined zoned closed-loop control of the drum wall temperature. Simultaneously, by setting a support ring 8 with an outer diameter larger than the combustion hood 2 and a corresponding multi-point drive unit, the stability of the drum body 1's rotational support and the uniformity of transmission are ensured while achieving the zoned heating structure.

[0026] Furthermore, the driving unit includes a driving roller and an auxiliary roller that are parallel to each other. The driving roller and the auxiliary roller are respectively disposed on both sides of the support ring 8 and are in frictional contact with the support ring 8 to support the cylinder 1. The driving roller and the auxiliary roller are rotatably connected to the base, and the driving roller is connected to a driving device.

[0027] Specifically, the drive unit includes parallel drive rollers and auxiliary rollers. Both drive rollers and auxiliary rollers are rotatably connected to the base via bearing seats or other structures, allowing both to rotate freely around their own axes. These two rollers are arranged on both sides of the corresponding support ring 8, forming stable frictional contact with the outer circumferential surface of the support ring 8 from below and the side. This arrangement allows the drive rollers and auxiliary rollers to together form a "V"-shaped support structure, which not only effectively supports the entire weight of the cylinder 1, the support ring 8, and the material on it, but also provides sufficient radial constraint to prevent excessive radial runout or offset of the cylinder 1 during rotation.

[0028] The drive roller is connected to a drive unit. This drive unit typically includes a motor, a reducer, and possible transmission mechanisms (such as chains, gears, or couplings). The power provided by the motor is transmitted to the drive roller after being speed-adjusted and torque-increased by the reducer, driving it to rotate actively. Due to the friction between the drive roller and the support ring 8, when the drive roller rotates, it drives the support ring 8 through this friction, thereby driving the entire cylinder 1 to rotate. The auxiliary roller, acting as a driven roller, rotates along with the support ring 8 under the drive of the drive roller, mainly serving to provide auxiliary support and stabilize the transmission.

[0029] Furthermore, the combustion hood 2 is also connected to a chimney 9, and multiple chimneys 9 are connected in parallel to the main flue gas duct, which is connected to a flue gas treatment device.

[0030] Specifically, chimney 9 serves as an independent discharge channel for the combustion products of the corresponding combustion components, enabling timely extraction of flue gas from the combustion hood 2. This prevents high-temperature flue gas from accumulating inside the combustion hood, which could lead to excessive pressure or affect combustion efficiency. It also prevents large-scale leakage of flue gas into the working environment through the gap between the combustion hood and the outer wall of the cylinder 1. The outlet ends of multiple chimneys 9 are connected in parallel to a shared main flue gas duct. This parallel arrangement ensures that the exhaust from each heating zone is independent and does not interfere with each other. Even if the combustion intensity or fuel flow rate changes in a certain heating zone, its flue gas emission will not significantly affect the combustion conditions of other heating zones, thus ensuring the independence and stability of temperature control in each zone. The diameter and layout of the main flue gas duct need to be designed to meet the total flow requirements when multiple chimneys 9 discharge simultaneously, while minimizing flow resistance. A flue gas treatment device (not shown in the figure) is connected to the end of the main flue gas duct. This device may include a dust collector (such as a bag filter or cyclone dust collector), desulfurization and denitrification equipment, and an induced draft fan.

[0031] Example 2 Based on the above embodiment 1, as follows Figure 3 As shown, this embodiment provides a control method for a recycling roller, which is applied to the anti-adhesion recycling roller as described in Embodiment 1. The method includes the following steps S100-S300.

[0032] S100: After the equipment self-checks and starts, it determines the target cylinder wall temperature corresponding to each heating zone based on the preset initial working conditions and the feeding signal.

[0033] Specifically, in step S100, after the operator issues the start command, the control system first executes the equipment self-test procedure. This procedure includes, but is not limited to: checking whether the signals of all cylinder wall temperature measuring devices 5 are normal, whether each regulating valve 4 is in a safe initial position (usually fully closed or at minimum opening), whether each flame detector 6 is ready, and whether the drive components and each safety sensor are fault-free. After the self-test passes, the system enters standby mode.

[0034] Subsequently, the control system receives a "ready to feed" signal from upstream equipment or a "start production" command manually entered by the operator. Based on this feed signal, the control system retrieves a preset process parameter database. This database stores a set of process parameters corresponding to different production formulations (such as different RAP blending ratios, target yields, initial material temperatures, etc.). For the current initial operating condition (e.g., planned production of recycled mixture with a RAP blending ratio of 50% and a yield of 120 tons / hour), the control system reads the preset target cylinder wall temperature values ​​for each heating zone for this operating condition from the parameter set. For example, for cylinder 1, which is axially divided into three heating zones, its target temperatures may be set to 115°C, 120°C, and 118°C, respectively, to meet the process requirements of gradual heating of the material within the cylinder. These target temperatures are set as the setpoints for the temperature control loops of the corresponding heating zones.

[0035] S200: Real-time acquisition of the actual measured temperature of the cylinder wall in each of the heating zones.

[0036] Specifically, in step S200, during the operation of the regeneration drum, the cylinder wall temperature measuring device 5 installed in each heating zone continuously performs non-contact temperature measurement on the outer wall area of ​​the cylinder 1 it is responsible for monitoring. The control system synchronously acquires the analog or digital signals transmitted from all cylinder wall temperature measuring devices 5 at a fixed high-speed sampling period (e.g., 100 milliseconds). The acquired raw temperature signals are first processed by analog or digital filtering to suppress measurement noise caused by on-site electromagnetic interference, flue gas obstruction, etc., thereby obtaining process variable values ​​that can accurately reflect the actual temperature of the cylinder wall in each area.

[0037] S300: Compare the measured temperature of the cylinder wall of each heating zone with the corresponding target temperature of the cylinder wall to generate an independent temperature deviation signal, and adjust the opening degree of the corresponding regulating valve 4 based on the temperature deviation signal of each heating zone.

[0038] Specifically, in step S300, for the first Each heating zone ( (Total number of heating zones), the control system performs the following operations in each control cycle: First, calculate the real-time temperature deviation in this area. ,in The target temperature of the cylinder wall set for this heating zone, This represents the measured temperature of the cylinder wall in the heating zone at the current moment. This is the calculated temperature. This refers to the independent temperature deviation signal generated in the heating area.

[0039] Then, based on this temperature deviation signal The initial control output is calculated using an independent control algorithm for this heating zone. The control output is a signal representing the desired fuel flow rate.

[0040] Next, output this control. The signal is converted into a standard signal (such as a 4-20mA current signal) and output to the regulating valve 4 corresponding to the heating zone. The regulating valve 4 adjusts its valve core opening linearly or non-linearly based on the received signal, thereby precisely controlling the fuel flow to the corresponding combustion nozzle 3. The increase or decrease in fuel flow directly alters the heat power released by combustion, thus causing a corresponding change in the cylinder wall temperature to reduce temperature deviation. .

[0041] Importantly, the control loop for each heating zone is completely independent. The control system performs the above adjustment process in parallel for all heating zones. This means that even if the cylinder wall temperature changes asynchronously in different zones due to uneven material distribution, differences in air inlet conditions, etc., each zone can independently and quickly adjust its heating intensity based on its own generated temperature deviation signal, ultimately ensuring that the cylinder wall temperature of all heating zones is stabilized near its respective target value.

[0042] Further, in step S300, adjusting the opening of the corresponding regulating valve 4 based on the temperature deviation signal of each heating zone specifically includes the following steps S310-S330.

[0043] S310: Call the pre-established axial thermal coupling model of the cylinder as the prediction model; the thermal coupling model describes the thermal dynamic characteristics of each heating zone and the thermal interaction between adjacent zones caused by radiation and convection.

[0044] Specifically, in step S310, a mathematical model describing the axial thermal dynamic characteristics of the entire cylinder 1, namely the cylinder axial thermal coupling model, is permanently stored in the non-volatile memory of the control system. This model was pre-established and verified during the equipment commissioning phase through specialized experiments and system identification methods. During production operation, whenever the temperature control algorithm is executed, the system first calls this stored model in step S310.

[0045] The core function of this predictive model lies in its ability to predict the future more accurately than a simple single-point PID controller. It not only incorporates the thermal inertia of each heating zone (e.g., the delay and inertia between fuel addition and the actual temperature rise of the cylinder wall), but more importantly, it quantifies the thermal interactions between adjacent heating zones. For example, when the main heating zone is intensely heated, its high temperature not only raises its own cylinder wall temperature but also generates additional heating effects on adjacent heating zones through heat conduction and radiation from the cylinder metal. Conversely, if adjacent heating zones absorb a large amount of heat due to low feed temperatures, they may also "steal" some heat from the main heating zone, making it difficult for the main heating zone's temperature to rise. The model invoked in this step is precisely designed to anticipate these complex coupling effects during control decision-making.

[0046] Furthermore, the axial thermal coupling model of the cylinder called in step S310 is obtained through the following steps S301-S303.

[0047] S301: Discretize the cylinder 1 along the axial direction into multiple thermal nodes that correspond one-to-one with the heating area, and define a parameter set for each thermal node that includes its own heat transfer inertia parameters and the heat interaction coefficient between adjacent nodes.

[0048] Specifically, in step S301, the entire cylinder 1 is discretized along the axial direction into N thermal nodes, where N is the same as the number of heating regions (e.g., N=3, corresponding to three heating regions A, B, and C). Each thermal node represents a cylinder segment of a heating region, and its thermal dynamic characteristics are approximated by a first-order inertial element. The thermal coupling effect between nodes is characterized by the coupling thermal resistance.

[0049] Taking three heating regions as an example, its thermal network model can be described by the following set of ordinary differential equations:

[0050]

[0051]

[0052] In the formula, , , The measured temperatures of the cylinder wall at the three thermal nodes are respectively. , , The equivalent thermal fusion of the three thermal nodes is used to characterize the heat transfer inertia parameters; , , The net heating power received by the three hot nodes is non-linearly proportional to the adjustment opening valve 4 of the corresponding combustion hood 2, and the mapping curve can be obtained through calibration. hot nodes With hot nodes Coupling thermal resistance between Its reciprocal is the heat interaction coefficient; , , The heat loss coefficients between the three thermal nodes and the environment; The ambient temperature.

[0053] For non-adjacent heating regions (such as A and C), their coupling thermal resistance and Theoretically, it is infinite, and the heat interaction coefficient can be considered zero. In discretization, it is usually only necessary to consider the coupling between adjacent thermal nodes.

[0054] S302: By sequentially performing a step heating experiment with only a single heating zone operating and a coupled heating experiment with adjacent heating zones operating simultaneously, dynamic response data of the cylinder wall temperature of each heating zone are collected, and the specific values ​​of each parameter in the parameter set are obtained based on the data.

[0055] Specifically, in step S302, during the equipment installation and commissioning phase, the following experiments are conducted to obtain model parameters: First, the self-heating inertia parameters are identified: the drum is kept unloaded and stationary (or rotated at low speed, only to ensure uniform temperature); heating zone A is run alone, specifically by fixing its regulating valve 4 at a certain opening (e.g., 50%), and recording the entire step response curve of the drum wall temperature of heating zone A from the ambient temperature to the steady state; based on the recorded curve, the time constant and gain of the first-order inertial element are fitted using the least squares method and equal coefficient identification method, thereby calculating the equivalent heat melt of the heating zone. and heat loss coefficient (Assuming the ambient temperature is constant and known). Similarly, by running heating region B and heating region C separately, the results are obtained. , and , .

[0056] Secondly, heat interaction coefficient identification is performed: Adjacent heating zones A and B are run simultaneously, specifically maintaining a fixed valve opening (e.g., 50%) for heating zone A and a different valve opening (e.g., 40%) for heating zone B, and recording the process of both heating zones A and B reaching steady-state temperatures. During this process, the additional temperature change in heating zone A due to heating zone B (and vice versa) is analyzed, and known factors are combined. , , , This allows for the identification of coupling thermal resistance. (Right now Similarly, by operating heating zone B and heating zone C simultaneously, it is possible to identify... If weak coupling between non-adjacent regions is considered, heating regions A and C can be run simultaneously for identification.

[0057] S303: Verify the prediction accuracy of the model using a separate model test set, and store the parameter set for later use after the accuracy requirements are met.

[0058] Specifically, in step S303, a set of test conditions different from the identification experiment is used (e.g., simultaneously opening three heating zones and employing dynamically changing valve opening combinations) to compare the temperature change trajectory predicted by the model with the actual measured temperature data. The prediction error (e.g., root mean square error RMSE) is calculated. When the prediction error is less than a preset allowable threshold (e.g., ±2.5℃), the model accuracy is considered to meet the control requirements. The final determined model parameter set is then used. Along with other necessary mapping relationships (such as valve opening-heating power curves), these are stored in the non-volatile memory of the control system in the form of a parameter activity coefficient matrix. During normal production, step S310 directly calls this stored model to perform rapid multi-step prediction and optimization calculations based on real-time measured temperature and valve position status.

[0059] S320: In each control cycle, taking the temperature deviation signal corresponding to the actual measured temperature gauge of each heating zone as the initial state, the prediction model is used to predict the temperature change trajectory of each zone under various valve opening sequences in the next few cycles.

[0060] Specifically, in step S320, the control system repeatedly executes this optimized control process at a fixed control cycle (e.g., every 1 second). At the beginning of each control cycle, the system acquires the latest measured temperature of the cylinder wall in each heating zone. and its deviation from the target value This is used as the initial state vector for prediction.

[0061] Subsequently, the control system performs "rolling prediction" internally. Based on this initial state, it utilizes the axial thermal coupling model of the cylinder, pre-established and stored in steps S301-S303. This model mathematically encapsulates identified parameters such as the equivalent thermal melting, heat loss coefficient, and coupling thermal resistance between nodes for each thermal node. During prediction, the control system substitutes these parameters into the model and assumes that within a finite future time window (prediction time domain, e.g., the next 10 control cycles, or 10 seconds), it will attempt various possible combinations of control actions for the regulating valve 4 (i.e., multiple valve opening change sequences). For each hypothetical future control action sequence, the control system runs the thermal coupling model, starting from the current initial state, and dynamically calculates the heating power change caused by valve opening changes, the heat accumulation of each node, and the heat exchange between nodes through coupling thermal resistance within the future prediction time domain, ultimately obtaining the predicted trajectory of the dynamic change in cylinder wall temperature for each heating zone.

[0062] S330: Taking minimizing the deviation between the future predicted temperature and the target temperature of each cylinder wall as the optimization objective, solve for the future valve opening sequence that makes the predicted trajectory optimal from the current moment, and input the optimal opening value corresponding to the current moment in the sequence to the regulating valve 4 corresponding to each heating zone.

[0063] Specifically, in step S330, after the control system has completed the prediction of various future scenarios, it needs to select the "optimal" one. The objective function for optimization is defined as: minimizing the sum of squares of the deviations between the predicted temperature of all heating zones and their respective set target temperatures over the entire prediction time domain. Simultaneously, the optimization process typically also considers the smoothness of the control action to avoid drastic fluctuations in valve opening.

[0064] The control system uses a built-in optimization solver (such as a quadratic programming QP solver) to find the optimal future valve opening sequence from all possible hypothetical future control sequences that minimizes the above objective function value (i.e., the future predicted trajectory is closest to the ideal state).

[0065] Ultimately, the controller does not output the entire future sequence at once. Instead, it only outputs the first control action corresponding to the current moment in the optimal sequence to the corresponding adjustment valve 4 of each heating zone in real time. In the next control cycle, the system repeats the entire process of S310-S330 based on the new measurement state, re-predicting and re-optimizing to achieve rolling optimization and feedback correction.

[0066] Furthermore, the combustion hood 2 is also equipped with a pressure sensor and a gas concentration sensor; after step S300, steps S410-S440 are also included.

[0067] S410: When it is determined that the measured temperature of the cylinder wall in each heating zone is lower than the corresponding cylinder wall bonding temperature threshold, and the temperature change rate within the first set time period is less than the set change rate threshold, the measured temperature difference of the cylinder wall in adjacent heating zones is calculated in real time; the cylinder wall bonding temperature threshold corresponding to each heating zone is greater than the target temperature of the cylinder wall in that heating zone.

[0068] Specifically, in step S410, the system first performs a dual-condition judgment triggered by diagnosis. The first condition is a safety and performance benchmark judgment: the system determines whether the measured temperature of the cylinder wall in each heating zone is lower than its corresponding cylinder wall adhesion temperature threshold. This threshold is not a fixed value, but is dynamically generated based on the target cylinder wall temperature preset for each heating zone to optimize the regeneration process. Specifically, for a certain heating zone, its cylinder wall adhesion temperature threshold is set to a value slightly higher than its target cylinder wall temperature (for example, the target temperature plus a process margin of 3-5°C). The purpose of this setting is to provide sufficient heating space (target cylinder wall temperature) for the material to achieve the best mixing effect in this zone, and to set a safe buffer for equipment control and material characteristic fluctuations, ensuring that the actual operating temperature is always far away from the physical critical point where the material adheres. Therefore, when the measured temperature is lower than this associated threshold, it indicates that the zone is operating within a safe range, and also indirectly reflects that there may be untapped potential space between its current performance and the expected process value. The second condition is a steady-state judgment: the system determines whether the temperature change rate of all zones within a first set time period is less than a set change rate threshold. This condition confirms that the basic control system has brought the entire drum into a stable operating state of thermal dynamic equilibrium. Only when both conditions are met—that the temperature in all areas is below their associated bonding threshold and that the system as a whole has reached stability—does the system determine that it is currently in a safe and stable state, but its performance may not have reached the optimal design point. At this point, the system activates deep diagnostics and begins to calculate the measured temperature difference between adjacent drum walls in real time to assess the uniformity of axial heating.

[0069] S420: When the measured temperature difference of the cylinder wall is greater than the set temperature difference threshold, the cylinder wall temperature change rate with higher change rate in two adjacent heating areas is identified as the suspected abnormal heating area.

[0070] Specifically, in step S420, the system performs a diagnostic analysis of axial thermal uniformity. When the measured temperature difference between any pair of adjacent regions is consistently greater than a set temperature difference threshold, it indicates that there is significant uneven distribution of heat along the axial direction of cylinder 1. To locate the specific problem area, the system further analyzes the recent temperature change trend of this pair of regions and initially marks the region with a relatively high temperature change rate as a suspected abnormal heating area. The logic behind this judgment is that, given that the overall system has reached a steady state and the heating capacity seems limited, if a certain region still exhibits relatively strong self-heating initiative, it may indicate an abnormality in its combustion process, such as low combustion efficiency but still operating under high load, or its temperature being strongly disturbed by adjacent abnormal heat sources.

[0071] S430: Obtain the real-time pressure value and gas ratio value inside the combustion hood 2 corresponding to the suspected abnormal heating area; the gas ratio value is the ratio of the volume concentration of oxygen to the volume concentration of carbon monoxide in the real-time flue gas.

[0072] Specifically, in step S430, the system conducts an in-depth investigation of the combustion conditions in the identified suspected abnormal area. The system calls upon a dedicated sensor installed inside the combustion hood 2 in that area to acquire the real-time pressure value inside the combustion chamber, as well as the oxygen and carbon monoxide volume concentrations measured by an online flue gas analyzer, and calculates their real-time ratio. This gas ratio is a key diagnostic parameter characterizing whether combustion is complete and whether the air-fuel ratio is reasonable.

[0073] S440: When it is determined that the real-time pressure value deviates from the preset normal pressure range and the gas ratio deviates from the preset normal ratio range, the suspected abnormal heating area is determined to be an abnormal heating area, and a combustion abnormality signal is generated.

[0074] Specifically, in step S440, the system completes anomaly confirmation and initial fault judgment. The real-time pressure and gas ratio values ​​are compared with the pressure and gas ratio ranges calibrated for the area under normal, efficient combustion conditions. Only when both the real-time pressure and real-time gas ratio deviate from their respective normal ranges is the area ultimately confirmed as an abnormal heating zone, and a combustion anomaly alarm is generated. By analyzing specific deviation combinations of the two parameters, the system can further infer possible fault types. For example, low pressure and low gas ratio may indicate a fuel supply problem, while low pressure and high gas ratio may indicate air leakage.

[0075] Further, in step S440, when it is determined that the real-time pressure value deviates from the preset normal pressure range and the gas ratio deviates from the preset normal ratio range, the suspected abnormal heating area is determined to be an abnormal heating area. Specifically, this includes the following steps S441-S444. It should be noted that steps S441-S444 are parallel.

[0076] S441: If the real-time pressure value is lower than the lower limit of the normal pressure range and the ratio is lower than the lower limit of the normal ratio range, it is determined that the fuel supply is insufficient or the nozzle is partially blocked.

[0077] Specifically, step S441 addresses the situation where "the real-time pressure value is lower than the lower limit of the preset normal pressure range, and the gas ratio is lower than the lower limit of the preset normal ratio range." This combination of "low pressure and low ratio" is a typical characteristic of severely incomplete combustion. Low pressure indicates insufficient flow or pressure of the fuel-air mixture entering the combustion chamber; simultaneously, a low gas ratio means low oxygen concentration and high carbon monoxide concentration in the flue gas, confirming incomplete combustion and the presence of a large amount of unburned combustible components. Therefore, the system prioritizes classifying such anomalies as "insufficient fuel supply" or "partial nozzle blockage." Insufficient fuel supply may stem from upstream pipeline valve malfunction, filter blockage, or fuel pressure regulation failure; partial nozzle blockage will impair fuel atomization, preventing sufficient mixing and combustion even if fuel flows in, leading to low efficiency and increased pollutant emissions.

[0078] S442: If the real-time pressure value is lower than the lower limit of the normal pressure range and the ratio is higher than the upper limit of the normal ratio range, it is determined that the air intake system is leaking or the smoke exhaust is excessive.

[0079] Specifically, step S442 handles the scenario where "the real-time pressure value is lower than the lower limit of the preset normal pressure range, but the gas ratio is higher than the upper limit of the preset normal ratio range," i.e., "low pressure, high ratio." Low pressure also indicates abnormal fluid supply, but an abnormally high gas ratio (high oxygen, low carbon monoxide) indicates excessive air in the combustion zone. This is usually not a problem with combustion itself, but rather a loss of control over the combustion environment. Therefore, the system determines this situation as "air intake system leakage" or "excessive exhaust." A poorly sealed air intake system (such as the blower inlet pipe or burner damper) can cause excessive cold air to seep in, diluting the combustible mixture and lowering the combustion temperature; excessive exhaust may be due to an excessively large induced draft fan opening or an unexpected decrease in flue resistance, causing excessive air to be drawn into the combustion chamber. Both lead to heat loss and reduced thermal efficiency.

[0080] S443: If the real-time pressure value is higher than the upper limit of the normal pressure range and the ratio is lower than the lower limit of the normal ratio range, it is determined that the air intake system is blocked or the smoke exhaust is not smooth.

[0081] Specifically, step S443 corresponds to the mode of "real-time pressure value higher than the upper limit of the preset normal pressure range, and gas ratio lower than the lower limit of the preset normal ratio range," i.e., "high pressure, low ratio." High pressure in the combustion chamber usually indicates increased flow resistance or excessive input power, while the accompanying low ratio (low oxygen, high carbon monoxide) points to incomplete combustion in an oxygen-deficient environment. This combination strongly suggests either "air intake system blockage" or "poor exhaust." Air intake system blockage (such as a dirty air filter or deformed duct) restricts the entry of combustion air, leading to fuel-rich combustion; poor exhaust (such as ash accumulation in the flue or induced draft fan malfunction) causes combustion products to stagnate, increasing furnace pressure and hindering fresh air replenishment. Both of these faults can worsen combustion and potentially create safety hazards.

[0082] S444: If the real-time pressure value is higher than the upper limit of the normal pressure range and the ratio is higher than the upper limit of the normal ratio range, it is determined that the fuel supply is excessive or the nozzle is worn.

[0083] Specifically, step S444 analyzes the situation where "the real-time pressure value is higher than the upper limit of the preset normal pressure range, and the gas ratio is also higher than the upper limit of the preset normal ratio range," i.e., "high pressure and high ratio." High pressure indicates abnormal system input or resistance, while a high ratio indicates excessive oxygen. This usually occurs when the fuel flow rate is abnormally increased while the air volume is relatively greater, or when changes in combustion conditions lead to changes in combustion efficiency. Therefore, the system determines this type of abnormality as "excessive fuel supply" or "nozzle wear." Excessive fuel supply may be caused by a malfunctioning regulating valve or an incorrect given signal; nozzle wear will change the fuel injection angle and atomization particle size, affecting the flame shape and stability, which may cause some fuel to not react in the core combustion zone, but to be diluted or cooled in the excess air area, resulting in the appearance of high pressure and high oxygen content.

[0084] Furthermore, step S300 is followed by steps S510-S530. It should be noted that the sequence numbers of steps S510-S530 are only for convenience of explanation and do not imply that these steps are located after steps S410-S440.

[0085] S510: Obtain the flame detection signal of each of the flame detectors 6, the flame detection signal being used to characterize the combustion state of the flame.

[0086] Specifically, in step S510, the system continuously acquires the flame detection signals from each flame detector 6. The output signal of each flame detector 6 represents the "presence" or "extinguishment" state of the flame at the corresponding combustion nozzle 3 in real time. The control system reads the digital or analog signals of all flame detectors 6 cyclically at a frequency synchronized with or faster than the main control cycle, converting them into a unified logical state (e.g., "1" represents a normal flame, and "0" represents an extinguished flame), providing an immediate and reliable basis for subsequent judgments.

[0087] S520: When it is determined that any of the heating zones has gone out, the combustion component corresponding to that heating zone is re-ignited within a second set time period.

[0088] Specifically, in step S520, the system makes real-time judgments and responses based on the acquired flame status. When the flame signal corresponding to any heating zone changes from "normal" to "extinguished," the system immediately triggers the automatic recovery procedure for that zone. To achieve a balance between safety and efficiency, the system does not attempt ignition indefinitely, but instead sets a "second set duration" (e.g., 30 seconds to 2 minutes) as a recovery window. Within this window, the control logic automatically executes a complete ignition process on the combustion component corresponding to the abnormal zone. This process typically includes: briefly closing the fuel regulating valve 4 for that zone to perform purging; then reopening the ignition gun 7 and injecting a small flow of fuel to attempt ignition. The entire process is strictly executed by the control system according to the safety sequence control logic, and the system monitors the success of ignition in real time.

[0089] S530: If the ignition is successful, continue heating the cylinder 1; if the ignition fails, continue ignition until the cumulative number of failures exceeds the preset number, then close the regulating valve 4 corresponding to the heating area and issue an ignition abnormality signal.

[0090] Specifically, in step S530, the system evaluates and makes a decision on the result of the key fire attempt. If the flame detector signal in the area returns to "normal" after the key fire process is completed, the system determines that the key fire was successful. At this time, the control system will automatically reintegrate the area into the normal temperature regulation closed loop and continue to participate in heating. The entire process may only cause a brief temperature drop in the area, but the impact on the overall production continuity is minimal.

[0091] If the flame detector signal does not return to normal after the ignition process ends, the system determines that the ignition process has failed. Instead of immediately abandoning the process or triggering an alarm shutdown, the system employs a fault-tolerant retry mechanism. The system will repeat step S520, restarting the ignition process again within a second set time period after the next control cycle or a short delay. This design addresses recoverable flameouts caused by transient airflow disturbances or occasional ignition system malfunctions. However, to avoid pointless repeated attempts and fuel waste, as well as safety hazards, when there are substantial malfunctions in the combustion components (such as damage to the ignition gun 7 or complete fuel interruption), the system sets a preset number of attempts (e.g., 2 to 3 times) as a retry limit. The control system continuously accumulates the number of consecutive failures in the same area. Once the accumulated number of failures exceeds this preset number, the system determines that the combustion component cannot be recovered automatically. At this point, as a final safety and protection measure, the system immediately outputs a control command to completely close the regulating valve 4 corresponding to the abnormal heating area, completely cutting off the fuel supply, and simultaneously sending a clear "ignition anomaly signal" to the upper-level monitoring system. This signal includes the abnormal area number, fault time and type (continuous ignition failure), and is used to trigger an audible and visual alarm and prompt maintenance personnel to intervene and check.

[0092] The solution implemented in this paper enables closed-loop monitoring and intelligent recovery of the flame status. It can automatically handle most occasional flameout faults without human intervention, ensuring continuous and stable production to the greatest extent possible. At the same time, through a limited number of retry logics and a final hard safety shutdown, it effectively prevents safety risks such as fuel accumulation that may occur when there is a substantial equipment failure, significantly improving the system's automation level, safety, and reliability.

[0093] Furthermore, step S300 is followed by steps S610-S620. It should be noted that the sequence numbers of steps S610-S620 are only for convenience of explanation and do not limit the location of these steps to after steps S410-S440 or steps S510-S530.

[0094] S610: Continuously sample the measured temperature of the cylinder wall in each of the heating zones to obtain the temperature time series data of that heating zone.

[0095] Specifically, in step S610, the control system performs refined acquisition and processing of temperature data. For each independent heating zone, the control system continuously samples the measured temperature signal output by the cylinder wall temperature measuring device 5 at a rate much higher than the drum rotation frequency. The acquired sequence of raw temperature points constitutes temperature time-series data reflecting the microscopic changes in the cylinder wall temperature in that zone. This processed time-series data is cached in the control system's storage area for subsequent periodic feature analysis.

[0096] S620: If it is determined that there is a temperature fluctuation in the temperature time series data that is greater than the set temperature amplitude fluctuation range, and the fluctuation period is equal to the rotation period of the drum, then it is determined that there is a material adhesion problem in the heating area, and an adhesion abnormality signal is generated.

[0097] Specifically, in step S620, the control system performs the core adhesive feature identification and judgment. This step first requires determining the rotation cycle of the roller. This cycle can be obtained in real time by directly reading the signal from the speed sensor installed on the drive unit, or it can be set as a fixed parameter according to the rated speed of the equipment design.

[0098] When material begins to adhere to a certain area of ​​the inner wall of the drum and gradually forms a localized agglomeration, the thermal conductivity of this agglomerated area will be significantly lower than that of a smooth metal surface. As the drum rotates, this "thermal resistance anomaly point" will periodically pass through the observation area of ​​the infrared thermometer. When the thermometer is pointed at the adhered block, the measured surface temperature will drop instantaneously due to the increased thermal resistance; when the adhered block is moved away, the measured temperature returns to normal. This creates a periodic temperature fluctuation in the temperature time series data that is strictly synchronized with the drum rotation.

[0099] Therefore, the system performs a dual-condition judgment in step S620: First, it judges whether there are significant fluctuations in the temperature time series data that exceed the set temperature amplitude fluctuation range (e.g., ±3℃ to ±5℃), which is used to exclude normal measurement noise and minor disturbances. Second, and more specifically, it judges whether the fluctuation period of this significant fluctuation is equal to (or matches within the allowable error range) the real-time rotation period of the roller. This period matching analysis can be achieved through methods such as time domain correlation analysis or frequency domain spectrum analysis. If and only when a temperature fluctuation that is both "amplitude exceeding the limit" and "period matching" is detected, the system can determine with high confidence that a local material adhesion problem may have occurred on the inner wall of the roller in the corresponding heating area. Subsequently, the system generates and outputs an adhesion anomaly signal pointing to the specific heating area. This warning signal can remind operators to pay attention or arrange preventive maintenance in a timely manner when the adhesion layer is still thin and has not yet significantly affected thermal efficiency and material flow, thereby avoiding the expansion of the fault and production interruption.

[0100] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A non-sticking recycling drum for asphalt recycling, characterized in that, include: A base on which a cylindrical body (1) is rotatably mounted, the cylindrical body (1) being divided into multiple heating zones along the axial direction; Multiple combustion components are arranged at intervals along the axial direction of the cylinder (1) and correspond one-to-one with the position of the heating area; the combustion components include a combustion hood (2) sleeved on the outer wall of the cylinder (1), a combustion nozzle (3) provided at the bottom of the combustion hood (2), an adjustment valve (4) provided on the pipeline connecting the combustion nozzle (3) and the fuel supply equipment, a cylinder wall temperature measuring device (5) and a flame detector (6); The control method for the regeneration drum includes: After the equipment self-checks and starts, it determines the target cylinder wall temperature corresponding to each heating zone based on the preset initial working conditions and the feeding signal. Real-time measurement of the cylinder wall temperature in each of the heating zones; The measured temperature of the cylinder wall in each of the heating zones is compared with the corresponding target temperature of the cylinder wall to generate an independent temperature deviation signal, and the opening degree of the corresponding regulating valve (4) is adjusted based on the temperature deviation signal of each heating zone. The adjustment of the opening degree of the corresponding regulating valve (4) based on the temperature deviation signal of each heating zone includes: A pre-established axial thermal coupling model of the cylinder is used as the prediction model; the thermal coupling model describes the thermal dynamic characteristics of each heating zone and the thermal interaction between adjacent zones caused by radiation and convection. Within each control cycle, the temperature deviation signal corresponding to the actual measured temperature gauge of each heating zone is used as the initial state. The prediction model is used to predict the temperature change trajectory of each zone under various valve opening sequences in the next few cycles. With minimizing the deviation between the predicted future temperature and the target temperature of each cylinder wall as the optimization objective, the future valve opening sequence that makes the predicted trajectory optimal from the current moment is solved, and the optimal opening value corresponding to the current moment in the sequence is input to the regulating valve (4) corresponding to each heating zone. The pre-established axial thermal coupling model of the cylinder was obtained in the following way: The cylinder (1) is discretized along the axial direction into multiple thermal nodes that correspond one-to-one with the heating region, and a parameter set is defined for each thermal node, including its own heat transfer inertia parameter and the heat interaction coefficient between adjacent nodes; the multiple thermal nodes include three, and their thermal network model is as follows: In the formula, , , The measured temperatures of the cylinder wall at the three thermal nodes are respectively. , , The equivalent thermal fusion of the three thermal nodes is used to characterize the heat transfer inertia parameters; , , The net heating power received by the three hot nodes is in a non-linear proportional relationship with the adjustment valve (4) of the corresponding combustion hood (2); hot nodes With hot nodes Coupling thermal resistance between Its reciprocal is the heat interaction coefficient; , , The heat loss coefficients between the three thermal nodes and the environment; The ambient temperature; By sequentially performing a step heating experiment with only a single heating zone operating and a coupled heating experiment with adjacent heating zones operating simultaneously, dynamic response data of the cylinder wall temperature in each heating zone are collected, and the specific values ​​of each parameter in the parameter set are identified based on the data. The prediction accuracy of the model is verified using a separate model test set, and the parameter set is stored for later use once the accuracy requirements are met.

2. The anti-sticking recycling drum for asphalt recycling according to claim 1, characterized in that, The combustion hood (2) has a cylindrical structure, and an annular combustion space is formed between the inner wall of the combustion hood (2) and the outer wall of the cylinder (1); the combustion nozzle (3) has an arc-shaped structure corresponding to the bottom of the combustion hood (2).

3. The anti-sticking recycling drum for asphalt recycling according to claim 1, characterized in that, The combustion hood (2) is also connected to a chimney (9), and multiple chimneys (9) are connected in parallel to the main flue gas pipeline, which is connected to a flue gas treatment device.

4. The anti-sticking recycling drum for asphalt recycling according to claim 1, characterized in that, The combustion hood (2) is also equipped with a pressure sensor and a gas concentration sensor; after adjusting the opening of the corresponding regulating valve (4) based on the temperature deviation signal of each heating zone, the system further includes: If the measured temperature of the cylinder wall in each heating zone is lower than the corresponding cylinder wall bonding temperature threshold, and the temperature change rate within the first set time period is less than the set change rate threshold, the measured temperature difference of the cylinder wall in adjacent heating zones is calculated in real time; the cylinder wall bonding temperature threshold corresponding to each heating zone is greater than the target cylinder wall temperature of that heating zone. When the measured temperature difference of the cylinder wall is greater than the set temperature difference threshold, the one with the higher rate of change of cylinder wall temperature in two adjacent heating areas is identified as the suspected abnormal heating area. Obtain the real-time pressure value and gas ratio value inside the combustion hood (2) corresponding to the suspected abnormal heating area; the gas ratio value is the ratio of the volume concentration of oxygen to the volume concentration of carbon monoxide in the real-time flue gas. When the real-time pressure value deviates from the preset normal pressure range and the gas ratio deviates from the preset normal ratio range, the suspected abnormal heating area is determined to be an abnormal heating area, and a combustion abnormality signal is generated.

5. The anti-sticking recycling drum for asphalt recycling according to claim 4, characterized in that, The step of determining that the suspected abnormal heating area is an abnormal heating area when the real-time pressure value deviates from the preset normal pressure range and the gas ratio deviates from the preset normal ratio range includes: If the real-time pressure value is lower than the lower limit of the normal pressure range and the ratio is lower than the lower limit of the normal ratio range, it is determined that the fuel supply is insufficient or the nozzle is partially blocked. If the real-time pressure value is lower than the lower limit of the normal pressure range and the ratio is higher than the upper limit of the normal ratio range, it is determined that the air intake system is leaking or the smoke is being discharged excessively. If the real-time pressure value is higher than the upper limit of the normal pressure range and the ratio is lower than the lower limit of the normal ratio range, it is determined that the air intake system is blocked or the smoke exhaust is not smooth. If the real-time pressure value is higher than the upper limit of the normal pressure range and the ratio is higher than the upper limit of the normal ratio range, it is determined that there is excessive fuel supply or nozzle wear.

6. The anti-sticking recycling drum for asphalt recycling according to claim 1, characterized in that, After adjusting the opening of the corresponding regulating valve (4) based on the temperature deviation signal of each heating zone, the method further includes: Acquire the flame detection signals of each of the flame detectors (6), the flame detection signals being used to characterize the combustion state of the flame; When it is determined that any of the heating zones has been extinguished, the combustion component corresponding to that heating zone is re-ignited within a second set time period; If the initial ignition is successful, continue heating the cylinder (1); If the ignition fails, the ignition will continue until the cumulative number of failures exceeds the preset number. Then, the regulating valve (4) corresponding to the heating zone will be closed and an ignition abnormality signal will be issued.

7. The anti-sticking recycling drum for asphalt recycling according to claim 1, characterized in that, After adjusting the opening of the corresponding regulating valve (4) based on the temperature deviation signal of each heating zone, the method further includes: The measured temperature of the cylinder wall in each heating zone is continuously sampled to obtain the time-series temperature data of that heating zone. If the temperature time series data shows a temperature fluctuation greater than the set temperature amplitude fluctuation range, and the fluctuation period is equal to the rotation period of the drum, then it is determined that there is a material adhesion problem in the heating area, and an adhesion abnormality signal is generated.

Images