Intelligent continuous temperature control type waste resin pyrolysis recycling system and processing equipment

Abstract

The application discloses a kind of intelligent continuous temperature control type waste resin pyrolysis recycling system and processing equipment, it is related to resin pyrolysis recycling technical field, to be the closed-loop control passage of dynamic sensing unit, coupling analysis unit, linkage control unit, closed-loop feedback unit composition main, dynamic sensing unit adjusts acquisition frequency according to pyrolysis stage, obtains global temperature, environmental pressure and gas phase product generation data, coupling analysis unit constructs the influence relationship of three, completes pressure pre-judgment and parameter adaptability judgment, linkage control unit executes temperature gradient heating and gas phase product gradual discharge simultaneously, realize synergic control, closed-loop feedback unit is dynamically revised control strategy to three kinds of abnormal state, integrate above unit to complete parameter monitoring, temperature control and pressure control, for stabilizing pyrolysis environment, improve recycling quality, reduce energy consumption and equipment loss, applicable to waste resin large-scale pyrolysis recycling scene.

Description

Technical Field

[0001] This invention relates to the field of resin pyrolysis recycling technology, specifically to an intelligent continuous temperature-controlled waste resin pyrolysis recycling system and processing equipment. Background Technology

[0002] The core of waste resin pyrolysis recycling is to decompose resin at high temperature in an oxygen-free environment to recover valuable fibers and chemical raw materials. In particular, attention must be paid to changes in two key values: temperature and environmental pressure. Temperature is a key factor affecting the pyrolysis effect, and excessive pressure will also affect the pyrolysis effect. If the pressure is insufficient, a higher temperature is required to break the cross-linking bonds. Excessive pressure will not only change the reaction path and product distribution, but also lead to problems such as increased difficulty in process control and accelerated equipment wear.

[0003] However, it should be further explained that the pyrolysis pressure fluctuation can be regulated by controlling the amount of gas in the pyrolysis environment. The gas phase pyrolysis products are also key substances affecting the pyrolysis environment pressure. For example, if the output of gas phase pyrolysis products is too high, the pressure will rise rapidly. Conversely, if the discharge rate of gas phase pyrolysis products is too fast, the pyrolysis environment pressure may be insufficient.

[0004] To summarize, according to the ideal gas equation, there is an indirect influence between gas quantity and temperature. Adjusting the discharge rate of gas phase pyrolysis products is accompanied by temperature changes, and conversely, temperature control will also affect the pyrolysis process (the generation rate of gas phase pyrolysis products). Ultimately, this may lead to significant fluctuations in the two key parameters of temperature and ambient pressure, thus affecting the pyrolysis process. This invention proposes a solution to this problem. Summary of the Invention

[0005] The purpose of this invention is to provide an intelligent continuous temperature-controlled waste resin pyrolysis recycling system and processing equipment. Since the waste resin pyrolysis process mainly involves two key factors, temperature and environmental pressure, and these two factors have a mutual influence relationship, adjusting one parameter will inevitably affect the other parameter, ultimately leading to significant fluctuations in the overall pyrolysis environmental parameters and affecting the pyrolysis effect.

[0006] The objective of this invention can be achieved through the following technical solution: an intelligent continuous temperature-controlled waste resin pyrolysis recycling system, applied in a waste resin pyrolysis line and used to coordinate and regulate temperature and pressure fluctuations during the pyrolysis process, including a dynamic sensing unit, a coupling analysis unit, a linkage control unit, and a closed-loop feedback unit. The dynamic sensing unit, coupling analysis unit, linkage control unit, and closed-loop feedback unit are electrically connected to form a closed-loop control path. The dynamic sensing unit acquires dynamic parameters during the pyrolysis process and inputs them into the coupling analysis unit for dynamic analysis. The dynamic analysis process is then recorded into the linkage control unit, which performs two actions on the pyrolysis process: temperature control and gaseous product discharge. The closed-loop feedback unit has the action control authority of the linkage control unit. When performing temperature control and gas phase product discharge, it enters the closed-loop feedback unit simultaneously. Multiple feedback logic relationships are constructed in the closed-loop feedback unit, and intervention actions are performed on the coordinated control actions according to the feedback logic relationships.

[0007] Further configured as follows: the dynamic parameters include global temperature data, pyrolysis environmental pressure data, and gas phase pyrolysis product generation data during the pyrolysis process; the dynamic sensing unit adjusts the data acquisition frequency according to different stages of the pyrolysis process, reducing the acquisition frequency in the early and late stages of the reaction when the parameters change slowly, and increasing the acquisition frequency in the middle stage of the reaction when the parameters change drastically.

[0008] Further configured as follows: During the dynamic analysis process, the coupled analysis unit receives real-time data collected by the sensing module and constructs the influence relationship between temperature, pressure, and gas-phase pyrolysis product generation data, which includes: The coupled analysis unit uses temperature data and data generated from gas-phase pyrolysis products to form a pressure prediction and change analysis stage. During the pressure prediction and change analysis phase, pressure data is combined simultaneously to reverse-determine the compatibility between temperature and pressure parameters.

[0009] The linkage control unit is further configured as follows: the linkage control unit includes a temperature control component and a gas phase product discharge control component, and the two maintain synchronous operation. The temperature control component first raises the temperature to the target range according to the preset gradient based on the pyrolysis process, and then dynamically adjusts the temperature according to the judgment result of the analysis module. The gas phase product discharge control component changes the product discharge rate in a gradual manner and is used to form a synergistic relationship with the temperature control.

[0010] The system is further configured such that the feedback logic relationships in the closed-loop feedback unit correspond to three states: single parameter anomaly, temperature and pressure imbalance, and abnormal gas phase product recovery effect. The dynamic correction process of the system's operating state is completed through one or more methods, such as parameter fine-tuning, linkage adjustment, or overall parameter optimization.

[0011] The method is further configured as follows: the closed-loop feedback unit first sets the process threshold during the product recovery process, and compares the process threshold with the actual resource recovery effect. Based on the deviation between the two, the adaptation logic of temperature and pressure and the action ratio of the control module are optimized.

[0012] A smart, continuous temperature-controlled waste resin pyrolysis recycling and treatment equipment includes a pyrolysis reactor used in a waste resin pyrolysis line. The dynamic sensing unit, temperature control component, and gas phase product discharge control component are used in the pyrolysis reactor and respectively perform three actions: parameter monitoring, temperature control, and pressure control.

[0013] The present invention has the following beneficial effects: 1. The dynamic sensing unit adaptively adjusts the data acquisition frequency according to the pyrolysis stage to accurately capture the dynamic changes of temperature, environmental pressure and gaseous product generation across the entire domain. The coupling analysis unit constructs a coupling relationship model of the three to realize pressure prediction and parameter adaptability judgment. The linkage control unit synchronously executes temperature gradient heating and gradual discharge of gaseous products to avoid technical problems of mutual interference between temperature and pressure, avoid chain fluctuations caused by single parameter adjustment, keep the pyrolysis process in a stable and suitable range, reduce the occurrence of side reactions, ensure the high quality of recovered fibers, gaseous chemical raw materials and other products, and improve resource recovery rate. 2. During the coordinated adjustment process, the closed-loop feedback unit constructs dedicated feedback logic for three states: single parameter anomaly, temperature and pressure imbalance, and abnormal recovery effect. It dynamically corrects the control scheme through parameter fine-tuning, linkage adjustment, or overall optimization. It continuously optimizes the temperature and pressure adaptation logic and control action ratio based on the deviation between the process threshold and the actual recovery effect. This avoids problems such as increased energy consumption for high-temperature compensation and aggravated sealing loss of high-pressure equipment caused by parameter imbalance, extends equipment service life, reduces large-scale operation costs, and ensures that the system remains highly efficient and stable in continuous production, adapting to the actual needs of large-scale pyrolysis recovery of waste resin. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is an operational block diagram of an intelligent continuous temperature-controlled waste resin pyrolysis recycling system proposed in this invention. Detailed Implementation

[0016] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Example 1 Since the pyrolysis process of waste resin mainly involves two key factors—temperature and environmental pressure—and these two factors are interdependent, adjusting one parameter will inevitably affect the other, ultimately leading to significant fluctuations in the overall pyrolysis environmental parameters and impacting the pyrolysis effect. To address this, the following technical solution is proposed: Reference Figure 1 This embodiment describes an intelligent continuous temperature-controlled waste resin pyrolysis recycling system, which is applied in a waste resin pyrolysis line and used to coordinate and regulate temperature and pressure fluctuations during the pyrolysis process. The system includes a dynamic sensing unit, a coupling analysis unit, a linkage control unit, and a closed-loop feedback unit. The dynamic sensing unit, coupling analysis unit, linkage control unit, and closed-loop feedback unit are electrically connected to form a closed-loop control path. The dynamic sensing unit acquires dynamic parameters during the pyrolysis process and inputs them into the coupling analysis unit for dynamic analysis. The dynamic analysis process is then recorded into the linkage control unit, which performs two actions on the pyrolysis process: temperature control and gaseous product discharge. The closed-loop feedback unit has the action control authority of the linkage control unit. When performing temperature control and gas phase product discharge, it enters the closed-loop feedback unit simultaneously. Multiple feedback logic relationships are constructed in the closed-loop feedback unit, and intervention actions are performed on the coordinated control actions according to the feedback logic relationships.

[0018] Basic process description: Waste resin pyrolysis is a process in which the resin molecular chains are broken and decomposed through high temperature in an oxygen-free and closed environment, and finally transformed into recyclable fibers, gas-phase chemical raw materials and other products. Its core is to use thermal energy to break the cross-linking bonds between resin molecules to achieve resource separation and recycling. The entire process requires strict control of reaction conditions to avoid side reactions such as oxidation and carbonization that affect product quality and recovery rate. The key parameter is temperature control. When the temperature is below the critical pyrolysis temperature, the resin molecular chains only vibrate slightly, the cross-linking bonds are difficult to break, the pyrolysis reaction efficiency is extremely low, and almost no effective products are generated. Conversely, when the temperature is within the appropriate pyrolysis range, the molecular chain breaking rate is positively correlated with the product formation rate. Increased temperature will accelerate the breaking of cross-linked bonds and promote the desorption and formation of gaseous products. At this time, the products are mainly high-quality fibers and high-value gaseous raw materials. When the temperature is higher than the appropriate pyrolysis range, the molecular chains break excessively, which easily leads to secondary pyrolysis and carbonization reactions, resulting in the embrittlement of fiber products and the recombination of gaseous products into low-value heavy hydrocarbons. At the same time, it increases the amount of by-products (such as coke) generated and reduces resource recovery efficiency. It is also necessary to explain that the pyrolysis environment pressure indirectly affects the pyrolysis process by influencing the frequency of molecular collisions and the reaction equilibrium. Furthermore, the pyrolysis products include gaseous substances. When the pressure is lower than the critical pressure of the equipment, the gaseous products are prone to escape rapidly, which leads to a decrease in the frequency of molecular collisions in the reaction system and an increase in the activation energy required for the breakage of cross-linked bonds. The same pyrolysis effect can only be achieved by increasing the temperature, which not only increases energy consumption but may also cause side reactions due to high temperature. When the pressure is within a suitable range, the gaseous products maintain appropriate contact with the surface of the resin particles, which provides a stable reaction environment for molecular chain breakage and promotes orderly desorption of the products, thus achieving a balance between reaction efficiency and product quality. Conversely, when the pressure is much higher than the appropriate pressure range, it will change the pyrolysis reaction path. On the one hand, high pressure will inhibit the forward reaction of molecular chain breaking, causing the product distribution to shift towards heavy weight. On the other hand, excessive pressure will increase the difficulty of equipment sealing, aggravate equipment wear, and increase the difficulty of process control, which can easily lead to reaction instability caused by pressure fluctuations. The above only describes the influence of a single parameter on the pyrolysis process. However, according to the ideal gas equation PV=nRT (where P is pressure, V is the volume of the reaction chamber, n is the amount of gaseous product, R is the gas constant, and T is the absolute temperature), when the volume V of the pyrolysis reactor is fixed, changes in temperature T and the amount of gaseous product n will directly lead to fluctuations in pressure P, forming a coupled relationship, as shown below: When the temperature rises, if the rate of gaseous product discharge remains constant, n and T will increase simultaneously, which in turn will cause the pressure P to rise. When the rate of gaseous product discharge increases, n decreases, and even if the temperature T remains stable, the pressure P will decrease. Conversely, when the discharge rate decreases, P will increase. This can be understood as follows: when adjusting temperature or pressure from a single perspective, it will inevitably affect another parameter through the above coupling relationship. For example, increasing the temperature to accelerate pyrolysis will lead to an increase in P; decreasing the pressure to avoid carbonization will lead to a decrease in reaction efficiency. Temperature compensation needs to be adjusted simultaneously, which will eventually cause a chain of fluctuations in the two key parameters and affect the stability of the pyrolysis process. This part is the key technical problem of the present invention. In the following Example 2, a synergistic control process of temperature and pressure is generated.

[0019] Example 2: A coordinated control process for temperature and pressure is proposed for the basic process of waste resin pyrolysis in Example 1. This invention primarily establishes a closed-loop control pathway of "dynamic sensing - coupled analysis - coordinated regulation - closed-loop feedback." The dynamic sensing unit collects global temperature data T, environmental pressure data P, and gaseous product generation rate v (the amount of gaseous products generated per unit time) during the pyrolysis process. The coupled analysis unit receives these parameters, constructs a model of the influence relationship between T, P, and v, and completes pressure prediction and parameter suitability assessment. Based on the analysis results, the coordinated regulation unit simultaneously adjusts the temperature and gaseous product discharge rate. The closed-loop feedback unit compares the actual operating parameters with preset thresholds and corrects the regulation strategy through feedback logic to ensure stable system operation. This process generates the following stages: Pressure prediction and change analysis stage: Based on the simplified model of the ideal gas equation, assuming the pyrolysis reactor volume V is fixed and the gaseous product discharge rate is V0 (initial state), the calculation logic of the pressure prediction value P is as follows: the amount of gaseous product generated Δn is positively correlated with the temperature T, which is Δn = k1 × (T - T0) (k1 is the generation coefficient, T0 is the critical pyrolysis temperature), and the net increase of gaseous product per unit time is Δn. 净 =Δn-V0=k1×(T-T0)-V0, and the calculation method for the pressure prediction value is: P 预 =P0+(Δn 净 (P0 is the initial pressure, R is the gas constant) / V (P0 is the initial pressure, R is the gas constant); Temperature and pressure compatibility assessment stage: The predicted pressure value P... 预 The actual pressure P collected by the dynamic sensing unit 实 The comparison is performed to determine the fit between T and P, specifically including the following: 1) If |P 实 -P 预 |≤ΔP (ΔP is the allowable pressure deviation value, which can be preset according to process parameters), and T is in [T0,T1], P 实 Within the interval [P0, P1], it is determined that T and P are compatible, and the pyrolysis process is stable; 2) If P 实 >P 预 +ΔP indicates that the actual pressure is higher than the predicted value, which may be due to the gas phase product discharge rate V0 being too small or the temperature T being too high. It is determined to be a synergistic imbalance between T and P. 3) If P 实 <P 预 -ΔP indicates that the actual pressure is lower than the predicted value. This may be due to an excessively high gas phase product discharge rate V0 or an excessively low temperature T. It is also determined to be a synergistic imbalance between T and P. To supplement the above three points: Considering the change in the gaseous product formation rate v: if v increases abnormally (v > k² × T, where k is the rate coefficient), even if P... 实Even within the allowable range, it is also necessary to predict that the subsequent pressure may rise rapidly and start regulation in advance.

[0020] In this regard, the linkage control unit is explained in combination with the above two stages, and specifically includes the following contents: S1: Regarding the temperature control method, the temperature is raised according to a preset gradient in the initial stage, and the temperature rise rate r=ΔT / Δt (ΔT is the temperature rise amplitude each time, Δt is the temperature rise time interval) until the temperature reaches the lower limit T0 of the target interval [T0,T1]. When dynamically adjusting the temperature, the following process needs to be set according to the above coupling analysis process, and the temperature adjustment amount is set as ΔT 调 : S1-1: If it is determined that T and P are adapted, keep the current temperature unchanged, ΔT 调 =0; S1-2: If P 实 is too high and T is close to T1, lower the temperature, ΔT 调 =-k3×(P 实 -P1) (k3 is the temperature reduction coefficient); S1-3: If P 实 is too low and T is lower than T1, raise the temperature, ΔT 调 =k3×(P0-P 实 ); S2: Similarly, a regulation method for the discharge rate of gas-phase products is established, the discharge rate of gas-phase products v 调 is synchronized with temperature adjustment, and the discharge rate adjustment amount is set as Δv 调 : S2-1: Initial discharge rate V0=k4×T0 (k4 is the initial rate coefficient); S2-2: Dynamic adjustment stage: Δv 调 and ΔT 调 are positively correlated, which is simplified as Δv 调 =k5×ΔT 调 (k5 is the rate adjustment coefficient), that is, the discharge rate is increased synchronously when the temperature is raised, and the discharge rate is decreased synchronously when the temperature is lowered; S2-3: When P 实 deviates too much from the allowable range, additional adjustment is made separately: if P 实 >P1, the discharge rate is additionally increased by Δv 补 =k5×(P 实 -P1), if P 实 <P0, the discharge rate is additionally reduced by Δv 补 =-k5×(P0-P 实 ); Based on the above, it can be understood that the overall adjustment process is mainly used to achieve coordinated changes in T and v, thereby stabilizing P within a suitable range, which can be expressed as: T increases → v increases → P stabilizes; T decreases → v decreases → P stabilizes.

[0021] Example 3: Analysis of the closed-loop feedback unit based on the analysis process in Example 2: First, regarding the explanation of feedback logic, single-parameter anomalies occur when T exceeds [T0, T1] or P exceeds [P0, P1], but the other parameter is within the appropriate range; when both T and P are within the appropriate range, but |P 实 -P 预 |>ΔP, or v abnormality causing parameter deviation trend; or abnormal gas phase product recovery effect, such as η representing actual recovery efficiency, η=actual recovered product amount / theoretical recovered product amount, and η is lower than the preset threshold η0, η0 can also be preset according to process parameters; During dynamic correction, for single-parameter anomalies: only the anomaly parameter is adjusted while keeping the other parameter stable. For example, if T > T1 and P is in [P0, P1], then ΔT 调 =-k7×(T-T1) (k7 is the fine-tuning coefficient), v 调 Remain unchanged; To address the imbalance between temperature and pressure: Simultaneously adjust the control ratios of T and v. If the original control ratio is Δv... 调 / ΔT 调 =k5, the corrected ratio Δk5 = k5 × (P) 预 / P 实 By adjusting the rate coefficient, P 实 To P 预 Approach; For abnormal gaseous product recovery performance: First, calculate the deviation value Δη=η0-η, and then adjust the appropriate interval parameters according to the deviation: If Δη>0, it indicates that the current T and P fit is insufficient. The optimization target interval is T′=T0+k8×Δη (T′≤T1) and P′=P0+k9×Δη (P′≤P1) (k8 and k9 are optimization coefficients, T′ represents the optimized temperature, and P′ represents the optimized pressure prediction value). At the same time, adjust the generation coefficient k1=k1×(1+Δη) in the coupling analysis to make the model more consistent with the actual recovery performance. After each correction, the effect of the correction is verified by the T, P, v, and η data of the next collection cycle: if the parameters return to the appropriate range and η≥η0, the corrected parameters are maintained; if there is still a deviation, the feedback correction process is repeated until the system reaches a stable state.

[0022] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

[0023] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0024] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. An intelligent continuous temperature-controlled waste resin pyrolysis recycling system, characterized in that, It is used in waste resin pyrolysis lines to synergistically control temperature and pressure fluctuations during the pyrolysis process, including a dynamic sensing unit, a coupling analysis unit, a linkage control unit, and a closed-loop feedback unit. The dynamic sensing unit, coupling analysis unit, linkage control unit, and closed-loop feedback unit are electrically connected to form a closed-loop control path. The dynamic sensing unit acquires dynamic parameters during the pyrolysis process and inputs them into the coupling analysis unit for dynamic analysis. The dynamic analysis process is then recorded into the linkage control unit, which performs two actions on the pyrolysis process: temperature control and gaseous product discharge. The closed-loop feedback unit has the action control authority of the linkage control unit. When performing temperature control and gas phase product discharge, it enters the closed-loop feedback unit simultaneously. Multiple feedback logic relationships are constructed in the closed-loop feedback unit, and intervention actions are performed on the coordinated control actions according to the feedback logic relationships.

2. The intelligent continuous temperature-controlled waste resin pyrolysis recycling system according to claim 1, characterized in that, The dynamic parameters include global temperature data, pyrolysis environmental pressure data, and gas phase pyrolysis product generation data during the pyrolysis process. The dynamic sensing unit adjusts the data acquisition frequency according to different stages of the pyrolysis process, reducing the acquisition frequency in the early and late stages of the reaction when the parameters change slowly, and increasing the acquisition frequency in the middle stage of the reaction when the parameters change drastically.

3. The intelligent continuous temperature-controlled waste resin pyrolysis recycling system according to claim 2, characterized in that, During the dynamic analysis process, the coupled analysis unit receives real-time data collected by the sensing module and constructs the influence relationship between temperature, pressure, and gas-phase pyrolysis product generation data, which includes: The coupled analysis unit uses temperature data and data generated from gas-phase pyrolysis products to form a pressure prediction and change analysis stage. During the pressure prediction and change analysis phase, pressure data is combined simultaneously to reverse-determine the compatibility between temperature and pressure parameters.

4. The intelligent continuous temperature-controlled waste resin pyrolysis recycling system according to claim 3, characterized in that, The linkage control unit includes a temperature control component and a gas phase product discharge control component, and the two operate synchronously. The temperature control component first raises the temperature to the target range according to a preset gradient based on the pyrolysis process, and then dynamically adjusts the temperature based on the judgment result of the analysis module. The gas phase product discharge control component changes the product discharge rate in a gradual manner and is used to form a synergistic relationship with the temperature control.

5. The intelligent continuous temperature-controlled waste resin pyrolysis recycling system according to claim 4, characterized in that, The feedback logic relationships in the closed-loop feedback unit correspond to three states: single parameter anomaly, temperature and pressure imbalance, and abnormal gas phase product recovery effect. The dynamic correction process of the system's operating state is completed through one or more methods, such as parameter fine-tuning, linkage adjustment, or overall parameter optimization.

6. The intelligent continuous temperature-controlled waste resin pyrolysis recycling system according to claim 5, characterized in that, The closed-loop feedback unit first sets the process threshold for the product recovery process and compares the process threshold with the actual resource recovery effect. Based on the deviation between the two, it optimizes the temperature and pressure adaptation logic and the action ratio of the control module.

7. An intelligent continuous temperature-controlled waste resin pyrolysis recycling equipment, using the intelligent continuous temperature-controlled waste resin pyrolysis recycling system as described in claim 6, characterized in that, The invention includes a pyrolysis reactor used in a waste resin pyrolysis line. The dynamic sensing unit, temperature control component, and gas phase product discharge control component are used in the pyrolysis reactor and perform three actions respectively: parameter monitoring, temperature control, and pressure control.

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