Dew point air treatment method and apparatus

Abstract

This invention relates to a dew point air treatment method and apparatus. The method includes: acquiring state parameters; forming a downstream dehumidification gap based on a target dew point value and state parameters; splitting the downstream dehumidification gap into a front-end adjustment gap and a regeneration adjustment gap; adjusting the inlet air state of the downstream dehumidification using the front-end adjustment gap and adjusting the downstream regeneration capacity using the regeneration adjustment gap; performing feedback correction on the splitting ratio of the front-end adjustment gap and the regeneration adjustment gap based on the change in the outlet dew point of the downstream dehumidification after adjustment, and correcting the gap splitting ratio in the next control cycle accordingly, until the outlet dew point of the downstream dehumidification enters a preset error range of the target dew point value, and then switching to a holding control state after entering the preset error range. Using the above scheme can improve the control accuracy, response speed, and operational stability of the outlet dew point of the downstream dehumidification, and is beneficial to reducing the overall energy consumption of the system.

Description

Technical Field

[0001] This invention relates to the field of dehumidification and energy-saving technology, and in particular to a method and apparatus for dew point air treatment. Background Technology

[0002] Existing dual-rotor dehumidification systems typically employ a series structure of a pre-stage coarse dehumidification stage and a post-stage fine dehumidification stage to meet the requirements for low dew point air output. This type of system pre-treats the air in the pre-stage and then performs further deep dehumidification in the post-stage, and is widely used in applications requiring high air humidity.

[0003] However, existing dual-rotor dehumidification systems still have certain shortcomings in actual operation. On the one hand, the control of the downstream fine dehumidification stage is usually rather coarse, and the correlation between the inlet air condition, regeneration conditions, and outlet dew point is not sufficiently considered, leading to fluctuations in the downstream dehumidification effect when operating conditions change. On the other hand, when the outlet dew point deviates from the target value, the existing control method lacks sufficient adjustment flexibility and adaptability, easily resulting in problems such as response lag, low control accuracy, and poor operational stability.

[0004] Therefore, the existing solutions still need further improvement. Summary of the Invention

[0005] This application provides a dew point air treatment method and apparatus, which can improve the control accuracy, response speed and operational stability of the dew point at the outlet of the downstream dehumidifier, and help reduce the overall energy consumption of the system.

[0006] The objective of this invention is achieved as follows: A method for treating dew point air, comprising: Acquire status parameters, including the inlet air status parameters of the downstream dehumidifier, the outlet dew point parameters of the downstream dehumidifier, and the regeneration status parameters of the downstream stage; A downstream dehumidification gap is formed based on the target dew point value and the aforementioned state parameters; The downstream dehumidification gap is divided into a front-end adjustment gap and a regeneration adjustment gap; The front-end adjustment notch is used to adjust the inlet air state of the subsequent dehumidification stage, and the regeneration adjustment notch is used to adjust the regeneration capacity of the subsequent stage. Based on the adjusted dew point change at the downstream dehumidifier outlet, the splitting ratio of the upstream adjustment gap and the regeneration adjustment gap is corrected, and the gap splitting ratio in the next control cycle is adjusted accordingly until the downstream dehumidifier outlet dew point enters the preset error range of the target dew point value. After entering the preset error range, the system switches to a hold control state. The downstream dehumidifier outlet dew point change is determined based on the changes in the collected downstream dehumidifier outlet dew point parameters before and after adjustment or between adjacent control cycles.

[0007] Optionally, the step of forming the subsequent dehumidification gap based on the target dew point value and the state parameters includes: The target inlet status window and target regeneration capacity window are formed based on the target dew point value to correspond to the subsequent dehumidification stage. The inlet air state parameters of the downstream dehumidifier are compared with the target inlet state window to obtain the downstream inlet state deviation; The subsequent regeneration state parameters are compared with the target regeneration capacity window to obtain the subsequent regeneration capacity deviation; The dew point parameter at the outlet of the downstream dehumidifier is compared with the target dew point value to obtain the dew point deviation at the outlet of the downstream dehumidifier. The deviation of the downstream inlet state, the deviation of the downstream regeneration capacity, and the deviation of the downstream dehumidification outlet dew point are combined to obtain the downstream dehumidification gap.

[0008] Optionally, the inlet air state parameters of the downstream dehumidifier include the inlet air temperature, the inlet air humidity, and the inlet air volume; the downstream regeneration state parameters include the downstream regeneration temperature, the downstream regeneration air volume, and the regeneration exhaust state parameters; the regeneration exhaust state parameters include the regeneration exhaust temperature and the regeneration exhaust humidity. The formation of the target entry status window and the target regeneration capability window includes: The target inlet status window is formed based on the target dew point value, the characteristic parameters of the downstream dehumidification material, the inlet air temperature of the downstream dehumidification, the moisture content of the inlet air of the downstream dehumidification, and the air volume of the inlet air of the downstream dehumidification. The target regeneration capacity window is formed based on the downstream regeneration temperature, the downstream regeneration air volume, the regeneration exhaust temperature, the humidity state of the regeneration exhaust, and the releaseable heat of the heat storage module.

[0009] Optionally, the deviation fusion includes: The fusion weights of the downstream inlet state deviation, the downstream regeneration capacity deviation, and the downstream dehumidification outlet dew point deviation are adjusted based on the dew point improvement rate over multiple consecutive control cycles. The post-stage inlet state deviation, the post-stage regeneration capacity deviation, and the post-stage dehumidification outlet dew point deviation are weighted and fused according to the adjusted fusion weights to obtain the post-stage dehumidification gap; The improvement amount of the dew point at the outlet of the downstream dehumidifier is determined based on the change in the dew point at the outlet of the downstream dehumidifier, and the dew point improvement rate is determined based on the improvement amount of the dew point at the outlet of the downstream dehumidifier and the control cycle duration.

[0010] Optionally, the step of splitting the downstream dehumidification notch into a front-end adjustment notch and a regeneration adjustment notch includes: The changes in the outlet status of the pre-stage dehumidifier, the improvement in the dew point at the outlet of the post-stage dehumidifier, and the changes in the regeneration exhaust status were collected. Based on the change in the state of the pre-stage dehumidifier outlet, the improvement in the dew point of the post-stage dehumidifier outlet, and the change in the state of the regeneration exhaust air, determine the initial split ratio between the front-end regulation gap and the regeneration regulation gap. Within the rolling time window, the initial split ratio is corrected by combining the split ratios of the previous few control cycles to obtain the split ratio of the current control cycle. The front-end adjustment gap and the regeneration adjustment gap are formed according to the revised split ratio; The rolling time window covers at least one system thermal inertia response cycle, and the change in regenerative exhaust state is determined based on the changes in the collected regenerative exhaust state parameters before and after adjustment or between adjacent control cycles.

[0011] Optionally, adjusting the inlet air state of the subsequent dehumidification stage using the front-end adjustment notch includes: Adjust at least one of the following according to the priority order: fresh air pre-cooling intensity, pre-stage dehumidification capacity, and air heat exchange state before entering the post-stage dehumidification section; When the previous priority adjustment reaches the preset adjustment boundary and the air state at the inlet of the subsequent dehumidification stage has not yet entered the target inlet state window, the subsequent priority adjustment is triggered. The pre-cooling intensity of the fresh air is adjusted by regulating the refrigerant supply to the surface cooler and / or the setpoint of the air temperature at the surface cooler outlet. The pre-stage dehumidification capacity is adjusted by coordinating at least two of the pre-stage impeller speed, pre-stage regeneration temperature, and pre-stage regeneration air volume. The air heat exchange state is adjusted by adjusting the heat exchange capacity of the plate heat exchanger and / or the bypass ratio.

[0012] Optionally, adjusting the subsequent regeneration capacity using the regeneration adjustment gap includes: Adjust at least one of the following in order of priority: heat storage and release, subsequent regeneration air volume, and subsequent regeneration temperature; When the previous priority adjustment reaches the preset adjustment boundary and the subsequent regeneration capability has not yet entered the target regeneration capability window, the next priority adjustment is triggered. The post-regeneration capacity is regulated by at least two of the following: post-regeneration temperature, post-regeneration air volume, and heat storage and release. A silica gel-activated carbon composite adsorption material is used to form the pre-stage rotor, and a molecular sieve-alumina composite adsorption material is used to form the post-stage rotor, with the regeneration temperature of the post-stage rotor being higher than that of the pre-stage rotor.

[0013] Optionally, the step of feedback correction of the splitting ratio of the front-end adjustment gap and the regeneration adjustment gap based on the adjusted dew point change at the downstream dehumidifier outlet, and accordingly correcting the gap splitting ratio in the next control cycle, includes: The first feedback correction is performed based on the change in the dew point at the outlet of the adjusted downstream dehumidifier, and the second feedback correction is performed based on the change in the state of the adjusted regeneration exhaust air. When both the first preset condition corresponding to the first feedback correction and the second preset condition corresponding to the second feedback correction are met, the front-end regulation gap ratio and the regenerative regulation gap ratio in the current control cycle remain unchanged, and the current split ratio is used as the benchmark split ratio for the next control cycle. When the first preset condition is met but the second preset condition is not met, the proportion of regenerative adjustment gap in the next control cycle is reduced by a preset first correction step size, and the proportion of front-end adjustment gap is increased by a compensation amount corresponding to the first correction step size. When the second preset condition is met but the first preset condition is not met, the proportion of the front-end adjustment gap in the next control cycle is reduced by a preset second correction step size, and the proportion of the regenerative adjustment gap is increased by a compensation amount corresponding to the second correction step size. When neither the first preset condition nor the second preset condition is met, and the absolute value of the dew point deviation at the outlet of the downstream dehumidifier continues to increase within multiple consecutive sampling cycles, the split ratio update in the current control cycle is frozen, and the split ratio in the control cycle that most recently met the preset stability condition is retained as the transient split ratio. Under the transient split ratio, the heat storage and heat release distribution ratio inside the regeneration adjustment gap is preferentially increased. When the heat storage and release reaches the preset adjustment boundary and the subsequent regeneration capacity still has not entered the target regeneration capacity window, increase the subsequent regeneration temperature distribution ratio and / or subsequent regeneration air volume distribution ratio within the regeneration adjustment gap. When a decrease in waste heat supply is detected, the decrease in waste heat is converted into a heat source compensation bias, and the heat source compensation bias is added to the regeneration regulation gap ratio. When residual heat recovery is detected, the heat source compensation bias is gradually reduced according to the preset pullback slope, and the freeze on the split ratio update is lifted after the first preset condition and the second preset condition are satisfied simultaneously again. During the process of adjusting the split ratio, upper limit constraints, lower limit constraints, and single-cycle maximum change constraints are set for the front-end adjustment gap ratio and the regeneration adjustment gap ratio, respectively, and the sum of the adjusted front-end adjustment gap ratio and the regeneration adjustment gap ratio is kept constant. The results of the regeneration exhaust status change are determined based on the changes in the collected regeneration exhaust status parameters before and after adjustment or between adjacent control cycles.

[0014] Optionally, the transition to the hold control state includes: Fuzzy PID control is executed based on the dew point deviation and dew point deviation change rate at the outlet of the downstream dehumidifier, and the sampling period of the fuzzy PID control is set. When the dew point at the outlet of the downstream dehumidifier is close to the preset error range of the target dew point value, the adjustment step size corresponding to the front-end adjustment gap and the regeneration adjustment gap is reduced, and the front-end adjustment and regeneration adjustment are subject to amplitude-limiting linkage control. During the control phase, the inlet air condition and regeneration capacity of the downstream dehumidifier are continuously adjusted to keep the outlet dew point of the downstream dehumidifier within the preset error range of the target dew point value. The dew point deviation change rate is determined based on the change in dew point deviation at the outlet of the subsequent dehumidifier in adjacent control cycles and the duration of the control cycle.

[0015] A dew point air handling device includes: a fresh air pre-cooling unit, a pre-dehumidification unit, a heat exchange unit, a post-dehumidification unit, a regeneration unit, a heat storage unit, a detection unit, and a control unit; The fresh air pre-cooling unit, the pre-dehumidification unit, the heat exchange unit, and the post-dehumidification unit are connected in sequence to perform graded dehumidification treatment on the fresh air and output low dew point air. The regeneration unit is connected to the pre-dehumidification unit and the post-dehumidification unit respectively, and is used to regenerate the pre-dehumidification unit and the post-dehumidification unit; The heat storage unit is connected to the regeneration unit and is used to provide heat release or store waste heat from regeneration to the regeneration unit. The detection unit is used to collect the air state parameters at the inlet of the downstream dehumidifier, the dew point parameters at the outlet of the downstream dehumidifier, and the regeneration state parameters of the downstream dehumidifier. The control unit is connected to the detection unit, the fresh air pre-cooling unit, the pre-dehumidification unit, the heat exchange unit, the post-dehumidification unit, the regeneration unit, and the heat storage unit, and is configured to be the method described in any of the foregoing embodiments.

[0016] The above describes a process whereby the following parameters are obtained: inlet air state parameters, outlet dew point parameters, and regeneration state parameters of the subsequent dehumidification stage. A subsequent dehumidification gap is formed based on the target dew point value and these parameters. This gap is then divided into a front-end adjustment gap and a regeneration adjustment gap to adjust the inlet air state and regeneration capacity of the subsequent dehumidification stage, respectively. Furthermore, the ratio of the front-end adjustment gap to the regeneration adjustment gap is corrected based on the adjusted outlet dew point. This allows for dynamic adjustment of the control process under actual operating conditions, improving the control accuracy, response speed, and operational stability of the outlet dew point of the subsequent dehumidification stage, and ultimately reducing the overall energy consumption of the system. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is a flowchart of a dew point air treatment method provided in an embodiment of this application; Figure 2 This is a flowchart illustrating the process of determining a downstream dehumidification gap, as provided in an embodiment of this application. Figure 3 This is a schematic diagram illustrating the principle of fuzzy PID control provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a dew point air treatment device provided in an embodiment of this application. Detailed Implementation

[0019] The following detailed description of preferred embodiments is a preferred mode for carrying out the invention. This description is not intended to be limiting; it is provided to illustrate the general principles of the invention.

[0020] It should be understood that the terms "first," "second," "an," "a," and "one" in the following description refer to "at least one" or "one or more" in the embodiments. In particular, the term "a" may refer to "one" in one embodiment and "more than one" in another embodiment. Therefore, the above terms should not be construed as limiting the actual number of elements of the present invention.

[0021] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0022] As described in the background section, the existing solutions still require further improvement.

[0023] Specifically, the regeneration process of dual-rotor dehumidification systems often relies on unidirectional waste heat recovery or electric heating supplementation, which leads to serious energy waste, a high proportion of regeneration energy consumption, rapid performance degradation of the rotor adsorbent, inability of a single adsorbent material to adapt to the dehumidification needs of different humidity ranges, and low heat exchange efficiency between waste heat and regeneration air during the regeneration process.

[0024] To address the aforementioned technical issues, this solution provides a dew point air handling scheme. By acquiring the inlet air state parameters, outlet dew point parameters, and regeneration state parameters of the subsequent dehumidification stage, a subsequent dehumidification gap is formed based on the target dew point value and these state parameters. This gap is then divided into a front-end adjustment gap and a regeneration adjustment gap to adjust the inlet air state and regeneration capacity of the subsequent dehumidification stage, respectively. Simultaneously, based on the changes in the outlet dew point after adjustment, the ratio of the front-end adjustment gap to the regeneration adjustment gap is fed back and corrected. This allows for dynamic adjustment of the control process in conjunction with actual operating conditions, improving the control accuracy, response speed, and operational stability of the outlet dew point of the subsequent dehumidification stage, and ultimately reducing the overall energy consumption of the system.

[0025] To enable those skilled in the art to better understand and implement this solution, the following detailed description of the specific solution, principles, advantages, and effects of the present invention is provided with reference to the accompanying drawings and specific embodiments.

[0026] See Figure 1 , Figure 1 This is a flowchart of a dew point air treatment method provided in an embodiment of this application, specifically including: S101, Obtain status parameters, including the inlet air status parameters of the downstream dehumidifier, the outlet dew point parameters of the downstream dehumidifier, and the regeneration status parameters of the downstream dehumidifier.

[0027] In some embodiments, the inlet air state parameters of the downstream dehumidifier are used to characterize the air state entering the downstream dehumidifier unit. The downstream dehumidifier inlet air state parameters may include at least one of the downstream dehumidifier inlet air temperature, downstream dehumidifier inlet air moisture content, and downstream dehumidifier inlet air volume.

[0028] The dew point parameter at the outlet of the downstream dehumidifier is used to characterize the dryness of the air output from the downstream dehumidifier unit. Typically, the dew point parameter reflects whether the current downstream dehumidification capacity meets the target requirements.

[0029] The post-regeneration status parameters are used to characterize the operation of the post-regeneration process. These parameters may include at least one of the following: post-regeneration temperature, post-regeneration airflow, and regeneration exhaust air status parameters.

[0030] Since the dehumidification effect of the downstream stage is affected by both the inlet air condition and the regeneration state of the downstream stage, obtaining the state parameters can comprehensively reflect the current operating conditions of the downstream dehumidification unit, providing basic data support for subsequent control.

[0031] S102, a post-stage dehumidification gap is formed based on the target dew point value and the state parameters.

[0032] In some embodiments, a downstream dehumidification gap can be formed based on the deviation between the target dew point value and the current downstream dehumidification outlet dew point parameter, combined with the downstream dehumidification inlet air state parameter and the downstream regeneration state parameter.

[0033] The target dew point value is the system's target control value, used to characterize the desired dew point level of the air at the outlet of the downstream dehumidifier. When there is a deviation between the downstream dehumidifier outlet dew point parameter and the target dew point value, it indicates a difference between the current downstream dehumidifier capacity and the target requirement; this difference can be defined as the downstream dehumidifier gap.

[0034] In one embodiment, the difference between the target dew point value and the dew point parameter at the outlet of the subsequent dehumidifier can be used as the basic gap. The basic gap can be corrected by combining the air state parameters at the inlet of the subsequent dehumidifier and the regeneration state parameters of the subsequent dehumidifier, so as to form a subsequent dehumidifier gap that is more in line with the actual working conditions.

[0035] For example, if the air humidity at the inlet of the downstream dehumidifier is high or the downstream regeneration capacity is weak, a large downstream dehumidification gap can be formed even if the dew point deviation is the same.

[0036] In some embodiments, see Figure 2 , Figure 2 This application provides a flowchart for determining the downstream dehumidification gap, which may specifically include: S201, Based on the target dew point value, a target inlet status window and a target regeneration capacity window are formed for the subsequent dehumidification stage.

[0037] In some embodiments, the target dew point value is the control target that the subsequent dehumidification stage needs to achieve, used to characterize the dew point level that the outlet air of the subsequent dehumidification stage is expected to reach. Since the dehumidification effect of the subsequent dehumidification stage is related not only to the inlet air state of the subsequent dehumidification stage but also to the subsequent regeneration capacity, the target inlet state window and target regeneration capacity window corresponding to it can be determined based on the target dew point value.

[0038] In this embodiment, the target inlet status window refers to the range of air status at the inlet of the subsequent dehumidification stage that is allowed to enable the subsequent dehumidification stage to have the expected dehumidification capacity at the current target dew point value.

[0039] The target inlet status window can be composed of at least two of the following: the allowable range of inlet air temperature for the downstream dehumidifier, the allowable range of inlet air moisture content for the downstream dehumidifier, and the allowable range of inlet air volume for the downstream dehumidifier.

[0040] The target entry status window can be represented as a multi-dimensional interval defined by the upper and lower limits of each parameter, or as the allowable deviation range set around the target operating point.

[0041] The target regeneration capacity window refers to the range of regeneration capacity required to maintain or restore the expected adsorption capacity of the downstream dehumidifying material at the current target dew point value.

[0042] The target regeneration capacity window can be determined based on at least two of the following: the downstream regeneration temperature, the downstream regeneration air volume, the regeneration exhaust temperature, the humidity of the regeneration exhaust, and the heat that the heat storage module can release. Preferably, it is determined based on a combination of all the above parameters.

[0043] The target regeneration capacity window can be represented as one or more combinations of regeneration temperature range, regeneration air volume range, and equivalent regeneration capacity range.

[0044] In one example, the inlet air state parameters of the post-dehumidification stage include the inlet air temperature, the inlet air humidity, and the inlet air volume; the post-regeneration state parameters include the post-regeneration temperature, the post-regeneration air volume, and the regeneration exhaust state parameters; and the regeneration exhaust state parameters include the regeneration exhaust temperature and the regeneration exhaust humidity.

[0045] Accordingly, step S201 may include: The target inlet status window is formed based on the target dew point value, the characteristic parameters of the downstream dehumidification material, the inlet air temperature of the downstream dehumidification, the moisture content of the inlet air of the downstream dehumidification, and the air volume of the inlet air of the downstream dehumidification; the target regeneration capacity window is formed based on the downstream regeneration temperature, the downstream regeneration air volume, the regeneration exhaust temperature, the moisture content of the regeneration exhaust air, and the releaseable heat of the heat storage module.

[0046] S202, compare the air state parameters of the downstream dehumidification inlet with the target inlet state window to obtain the downstream inlet state deviation.

[0047] In some embodiments, the currently collected inlet air state parameters of the downstream dehumidifier can be compared with the target inlet state window to determine whether the current inlet air state of the downstream dehumidifier falls within the target inlet state window, and further obtain the downstream inlet state deviation.

[0048] In this embodiment, the post-stage inlet state deviation is used to characterize the degree of deviation between the actual air state at the post-stage dehumidification inlet and the target inlet state window.

[0049] When the inlet air temperature, moisture content, and air volume of the downstream dehumidifier are all within the target inlet status window, the downstream inlet status deviation can be zero or close to zero; when at least one of them exceeds the target inlet status window, the downstream inlet status deviation increases with the magnitude of the exceedance.

[0050] In some implementations, the downstream inlet state deviation can be obtained by weighted summation of normalized temperature deviation, moisture content deviation, and air volume deviation.

[0051] S203, compare the subsequent regeneration state parameters with the target regeneration capacity window to obtain the subsequent regeneration capacity deviation.

[0052] In some embodiments, the currently collected post-stage regeneration status parameters can be compared with the target regeneration capability window to determine whether the current post-stage regeneration capability meets the regeneration requirements corresponding to the target dew point value, and further obtain the post-stage regeneration capability deviation.

[0053] In this embodiment, the subsequent stage regeneration capability deviation is used to characterize the degree of deviation of the current subsequent stage regeneration state from the target regeneration capability window. If the current subsequent stage regeneration state parameters fall within the target regeneration capability window, the subsequent stage regeneration capability deviation can be considered small or zero; if the current subsequent stage regeneration state parameters exceed the target regeneration capability window, the subsequent stage regeneration capability deviation can be determined based on the deviation.

[0054] In one embodiment, when the subsequent regeneration state parameters include multiple parameters, the deviation of each regeneration state parameter relative to the target regeneration capability window can be calculated separately, and the comprehensive subsequent regeneration capability deviation can be obtained through weighted fusion.

[0055] For example, if the current regeneration temperature is lower than the lower limit of the target regeneration capacity window, or the regeneration air volume is lower than the corresponding requirement, it may indicate that the current regeneration capacity is insufficient, which is not conducive to the recovery of the adsorption capacity of the subsequent dehumidification impeller. At this time, the corresponding deviation of the subsequent regeneration capacity increases.

[0056] In some embodiments, the deviation of the subsequent regeneration capability can be represented by absolute difference, relative difference, normalized difference, deviation outside the interval, grade value, etc.

[0057] S204, compare the dew point parameter of the downstream dehumidifier outlet with the target dew point value to obtain the dew point deviation of the downstream dehumidifier outlet.

[0058] In some embodiments, the dew point parameter at the outlet of the downstream dehumidifier can be compared with the target dew point value to obtain the dew point deviation at the outlet of the downstream dehumidifier.

[0059] The dew point deviation at the outlet of the downstream dehumidifier is used to characterize the degree of deviation of the current outlet dew point from the target dew point value. If the current outlet dew point parameter of the downstream dehumidifier reaches the target dew point value or falls within the allowable error range of the target dew point value, the outlet dew point deviation of the downstream dehumidifier can be considered small or zero; if the current outlet dew point parameter of the downstream dehumidifier deviates from the target dew point value, the corresponding outlet dew point deviation of the downstream dehumidifier can be determined according to its deviation direction and magnitude.

[0060] For example, when the target dew point is -40℃ and the dew point at the outlet of the current and subsequent dehumidifiers is -35℃, it means that the current dew point is higher than the target requirement, indicating that the dehumidification effect of the subsequent stage has not yet reached the predetermined target. At this time, a corresponding dew point deviation at the outlet of the subsequent dehumidifier can be formed.

[0061] In one embodiment, the dew point deviation at the outlet of the downstream dehumidifier can be directly represented by the difference between the target dew point value and the current dew point parameter; in another embodiment, it can also be represented by normalized deviation, proportional deviation, or graded deviation.

[0062] It should be noted that the dew point deviation at the outlet of the downstream dehumidifier can directly reflect the difference between the current downstream dehumidifier result and the control target, and is an important basis for the formation of downstream dehumidifier gaps.

[0063] S205, the deviation of the downstream inlet state, the deviation of the downstream regeneration capacity, and the deviation of the downstream dehumidification outlet dew point are combined to obtain the downstream dehumidification gap.

[0064] Among them, the downstream dehumidification gap is used to characterize the overall deviation of the current operating state of the downstream dehumidification section from the target dew point control requirements. The larger the value, the stronger the current adjustment demand.

[0065] In some embodiments, the deviation of the downstream inlet state, the deviation of the downstream regeneration capacity, and the deviation of the downstream dehumidification outlet dew point can be fused to form a downstream dehumidification gap.

[0066] The fusion process is used to comprehensively characterize the overall deficiency of the current downstream dehumidification stage relative to the target dew point requirement in three aspects: inlet air conditions, regeneration capacity, and outlet results. By fusing multiple deviations, the resulting downstream dehumidification gap can reflect not only the final dew point deviation but also the operating conditions that caused this deviation.

[0067] In one embodiment, the deviation fusion includes: adjusting the fusion weights of the downstream inlet state deviation, the downstream regeneration capacity deviation, and the downstream dehumidification outlet dew point deviation according to the dew point improvement rate over multiple consecutive control cycles; weighting and fusing the downstream inlet state deviation, the downstream regeneration capacity deviation, and the downstream dehumidification outlet dew point deviation according to the adjusted fusion weights to obtain the downstream dehumidification gap; wherein, the downstream dehumidification outlet dew point improvement amount is determined based on the downstream dehumidification outlet dew point change result, and the dew point improvement rate is determined based on the downstream dehumidification outlet dew point improvement amount and the control cycle duration.

[0068] In one embodiment, after determining the weights, the fusion can be performed as follows: Post-stage dehumidification gap = a × Post-stage inlet state deviation + b × Post-stage regeneration capacity deviation + c × Post-stage dehumidification outlet dew point deviation; where a, b, and c are the weighting coefficients of the corresponding deviation items.

[0069] In other embodiments, fuzzy fusion, rule fusion, neural network model fusion, lookup table fusion, or piecewise function fusion can also be used to obtain the subsequent dehumidification gap, and the present invention does not limit this.

[0070] In one example, when the dew point deviation at the outlet of the downstream dehumidifier is large, and the deviations in the inlet state and regeneration capacity of the downstream dehumidifier are also large, the downstream dehumidifier gap obtained by fusion can be increased accordingly; while when the dew point deviation at the outlet of the downstream dehumidifier is small, and the inlet state and regeneration state are close to the target window, the downstream dehumidifier gap obtained by fusion can be decreased accordingly.

[0071] In other words, by integrating the deviation of the downstream inlet state, the deviation of the downstream regeneration capacity, and the deviation of the downstream dehumidification outlet dew point, a more comprehensive and realistic downstream dehumidification gap can be formed, thus providing a more accurate basis for subsequent gap decomposition and coordinated control.

[0072] S103, the downstream dehumidification notch is split into a front-end adjustment notch and a regeneration adjustment notch.

[0073] In some embodiments, the controller may split the downstream dehumidification gap into a front-end adjustment gap and a regeneration adjustment gap according to preset splitting rules, historical operating data, current operating conditions or model calculation results.

[0074] Among them, the front-end regulation gap is used to characterize the amount of regulation required by adjusting the inlet air state of the subsequent dehumidifier, and the regeneration regulation gap is used to characterize the amount of regulation required by adjusting the regeneration capacity of the subsequent stage.

[0075] In one embodiment, the downstream dehumidification gap can be allocated according to a preset ratio to obtain the front-end adjustment gap and the regeneration adjustment gap respectively.

[0076] In another embodiment, the splitting ratio can be adaptively determined based on the current system operating conditions. For example, when there is a large adjustment range in the air condition at the inlet of the downstream dehumidifier, the proportion of the upstream adjustment gap can be appropriately increased; when there is a large room for improvement in the downstream regeneration capacity, the proportion of the regeneration adjustment gap can be appropriately increased.

[0077] In one embodiment, step S103 may include: collecting the change in the state of the pre-stage dehumidifier outlet, the improvement in the dew point of the post-stage dehumidifier outlet, and the change in the state of the regeneration exhaust air; determining the initial split ratio of the front-end adjustment gap and the regeneration adjustment gap based on the change in the state of the pre-stage dehumidifier outlet, the improvement in the dew point of the post-stage dehumidifier outlet, and the change in the state of the regeneration exhaust air; correcting the initial split ratio within a rolling time window by combining the split ratios of the previous several control cycles to obtain the split ratio of the current control cycle; forming the front-end adjustment gap and the regeneration adjustment gap according to the corrected split ratio; wherein, the rolling time window covers at least one system thermal inertia response cycle, and the change in the state of the regeneration exhaust air is determined based on the changes in the collected regeneration exhaust air state parameters before and after adjustment or between adjacent control cycles.

[0078] Thus, by collecting data on changes in the outlet status of the pre-dehumidifier, improvements in the dew point at the outlet of the post-dehumidifier, and changes in the regeneration exhaust status, the initial splitting ratio of the front-end adjustment gap and the regeneration adjustment gap is determined. This initial splitting ratio is then corrected within a rolling time window based on the splitting ratios of the previous several control cycles to obtain the splitting ratio for the current control cycle. The front-end adjustment gap and the regeneration adjustment gap are then formed according to the corrected splitting ratio. This improves the rationality of the gap splitting, thereby enhancing the stability and accuracy of the control. S104, the inlet air state of the subsequent dehumidification stage is adjusted by the front-end adjustment notch, and the regeneration adjustment notch is used to adjust the regeneration capacity of the subsequent stage.

[0079] In some embodiments, the controller can generate a front-end adjustment command based on the front-end adjustment notch to adjust the inlet air state of the subsequent dehumidification stage; at the same time, it can generate a regeneration adjustment command based on the regeneration adjustment notch to adjust the regeneration capacity of the subsequent stage.

[0080] Adjusting the air condition at the inlet of the downstream dehumidifier can include adjusting the operating parameters, air supply parameters, air mixing ratio, and heat exchange status of the upstream dehumidifier unit to change the air temperature, humidity, moisture content, or air volume entering the downstream dehumidifier unit.

[0081] For example, the inlet air conditions of the downstream dehumidifier can be changed by adjusting the pre-stage dehumidification capacity, supply air temperature, supply air humidity, air volume, or bypass ratio.

[0082] Adjusting the regeneration capacity of the downstream stage can include adjusting the regeneration heating power, regeneration temperature, regeneration air volume, fan speed, valve opening, or airflow path to enhance or weaken the downstream regeneration capacity.

[0083] Through the synergistic effect of front-end regulation and regeneration regulation, the inlet conditions of the subsequent dehumidification stage and the subsequent regeneration capacity can be better matched with the target dew point requirements.

[0084] In one example, the air state at the inlet of the downstream dehumidifier is adjusted using the aforementioned front-end adjustment notch, including: According to the priority order of fresh air pre-cooling intensity, pre-stage dehumidification capacity, and air heat exchange status entering the subsequent dehumidification stage, at least one of these factors is selected for adjustment; when the adjustment amount of the previous priority reaches the preset adjustment boundary and the air status at the inlet of the subsequent dehumidification stage has not yet entered the target inlet status window, the adjustment of the next priority is triggered; the fresh air pre-cooling intensity is adjusted by adjusting the refrigerant supply of the surface cooler and / or the set value of the surface cooler outlet air temperature; the pre-stage dehumidification capacity is adjusted by coordinating at least two of the following: the pre-stage impeller speed, the pre-stage regeneration temperature, and the pre-stage regeneration air volume; and the air heat exchange status is adjusted by adjusting the heat exchange capacity of the plate heat exchanger and / or the bypass ratio.

[0085] In one example, adjusting the subsequent regeneration capability using the regeneration adjustment gap includes: According to the priority order of heat storage and release, subsequent regeneration air volume and subsequent regeneration temperature, at least one of them is selected for adjustment; when the adjustment amount of the previous priority reaches the preset adjustment boundary and the subsequent regeneration capacity still has not entered the target regeneration capacity window, the adjustment of the next priority is triggered; the subsequent regeneration capacity is synergistically adjusted by at least two of the subsequent regeneration temperature, subsequent regeneration air volume and heat storage and release; the front-stage impeller is formed by silica gel-activated carbon composite adsorption material, and the subsequent impeller is formed by molecular sieve-alumina composite adsorption material, and the regeneration temperature of the subsequent impeller is higher than that of the front-stage impeller.

[0086] S105, based on the adjusted dew point change at the downstream dehumidifier outlet, the splitting ratio of the upstream adjustment gap and the regeneration adjustment gap is fed back and corrected, and the gap splitting ratio in the next control cycle is corrected accordingly, until the dew point at the downstream dehumidifier outlet enters the preset error range of the target dew point value, and then the control state is switched to hold after entering the preset error range.

[0087] The result of the change in the dew point at the outlet of the downstream dehumidifier is determined based on the changes in the collected dew point parameters at the outlet of the downstream dehumidifier before and after adjustment or between adjacent control cycles.

[0088] In some embodiments, after the adjustment operation is performed, the dew point parameters of the downstream dehumidifier outlet can continue to be collected, and the result of the dew point change at the downstream dehumidifier outlet can be determined based on the dew point changes before and after adjustment or between adjacent control cycles.

[0089] The changes in the dew point at the outlet of the downstream dehumidifier can be used to characterize the actual impact of upstream and regeneration adjustments on the downstream dehumidification effect within the current control cycle. If the dew point changes towards the target dew point after adjustment, it indicates that the current splitting ratio is reasonable; if the dew point change is not significant, the change is small, or it deviates from the target direction, it indicates that there is room for further optimization of the current splitting ratio.

[0090] In one embodiment, the allocation relationship between the front-end regulation gap and the regeneration regulation gap can be corrected based on the dew point change results, and the gap splitting ratio in the next control cycle can be adjusted accordingly.

[0091] For example, if it is determined that regenerative regulation has a more significant effect on improving the dew point, the proportion of the regenerative regulation gap in the next control cycle can be increased; if it is determined that front-end regulation has a more significant effect on improving the dew point, the proportion of the front-end regulation gap in the next control cycle can be increased.

[0092] In some embodiments, the correction of the splitting ratio can be achieved by means of empirical coefficient correction, proportional integral correction, model prediction correction, self-learning correction, or table lookup correction, etc., and the present invention does not limit this.

[0093] The preset error range is used to define the allowable deviation range between the dew point at the outlet of the subsequent dehumidifier and the target dew point value. When the dew point at the outlet of the subsequent dehumidifier enters the preset error range, it indicates that the current dehumidification effect of the subsequent stage has met the control requirements.

[0094] Once the system enters the preset error range, it can switch to a hold control state. In the hold control state, the current control parameters can be maintained, or only minor adjustments can be made to suppress dew point fluctuations and reduce the impact of frequent adjustments on system operation.

[0095] In some optional embodiments, the results of dew point changes at the outlet of the downstream dehumidifier can also be filtered, smoothed, or trend-judged to reduce the interference of sampling fluctuations on the split ratio correction.

[0096] In some optional embodiments, upper and lower limits can be set for the splitting ratio of the front-end regulation gap and the regeneration regulation gap to avoid a certain regulation channel bearing too much regulation and affecting the system stability.

[0097] In some optional embodiments, the split ratio correction results under different operating conditions can also be recorded so that the corresponding control strategy can be invoked when similar operating conditions occur in the future, thereby improving control efficiency and adaptability.

[0098] In one embodiment, based on the adjusted dew point change at the downstream dehumidifier outlet, the splitting ratio of the upstream adjustment gap and the regeneration adjustment gap is corrected, and the gap splitting ratio in the next control cycle is adjusted accordingly, including: The first feedback correction is performed based on the change in the dew point at the outlet of the adjusted downstream dehumidifier, and the second feedback correction is performed based on the change in the state of the adjusted regeneration exhaust air. When both the first preset condition corresponding to the first feedback correction and the second preset condition corresponding to the second feedback correction are met, the front-end regulation gap ratio and the regenerative regulation gap ratio in the current control cycle remain unchanged, and the current split ratio is used as the benchmark split ratio for the next control cycle. When the first preset condition is met but the second preset condition is not met, the proportion of regenerative adjustment gap in the next control cycle is reduced by a preset first correction step size, and the proportion of front-end adjustment gap is increased by a compensation amount corresponding to the first correction step size. When the second preset condition is met but the first preset condition is not met, the proportion of the front-end adjustment gap in the next control cycle is reduced by a preset second correction step size, and the proportion of the regenerative adjustment gap is increased by a compensation amount corresponding to the second correction step size. When neither the first preset condition nor the second preset condition is met, and the absolute value of the dew point deviation at the outlet of the downstream dehumidifier continues to increase within multiple consecutive sampling cycles, the split ratio update in the current control cycle is frozen, and the split ratio in the control cycle that most recently met the preset stability condition is retained as the transient split ratio. Under the transient split ratio, the heat storage and heat release distribution ratio inside the regeneration adjustment gap is preferentially increased. When the heat storage and release reaches the preset adjustment boundary and the subsequent regeneration capacity still has not entered the target regeneration capacity window, increase the subsequent regeneration temperature distribution ratio and / or subsequent regeneration air volume distribution ratio within the regeneration adjustment gap. When a decrease in waste heat supply is detected, the decrease in waste heat is converted into a heat source compensation bias, and the heat source compensation bias is added to the regeneration regulation gap ratio. When residual heat recovery is detected, the heat source compensation bias is gradually reduced according to the preset pullback slope, and the freeze on the split ratio update is lifted after the first preset condition and the second preset condition are satisfied simultaneously again. During the process of adjusting the split ratio, upper limit constraints, lower limit constraints, and single-cycle maximum change constraints are set for the front-end adjustment gap ratio and the regeneration adjustment gap ratio, respectively, and the sum of the adjusted front-end adjustment gap ratio and the regeneration adjustment gap ratio is kept constant. The results of the regeneration exhaust status change are determined based on the changes in the collected regeneration exhaust status parameters before and after adjustment or between adjacent control cycles.

[0099] In this embodiment, the first preset condition can be a condition used to determine whether the improvement of the dew point at the outlet of the downstream dehumidifier within the current control cycle meets the preset requirements.

[0100] In some implementations, the first preset condition may include at least one of the following: the dew point deviation at the outlet of the downstream dehumidifier is reduced compared to the previous control cycle, the improvement in the dew point at the outlet of the downstream dehumidifier is greater than a first threshold, and the dew point improvement rate is greater than a second threshold.

[0101] The second preset condition can be a condition used to determine whether the regeneration side adjustment has met the preset requirements within the current control cycle.

[0102] In some implementations, the second preset condition may include at least one of the following: the temperature change of the regenerated exhaust air conforms to a preset trend, the humidity change of the regenerated exhaust air conforms to a preset trend, and the energy utilization rate on the regenerated side reaches a preset level.

[0103] The specific thresholds for the first and second preset conditions can be obtained through experimental tuning based on system size, target dew point level, sensor accuracy, and on-site conditions.

[0104] The preset stability condition is used to determine whether the split ratio corresponding to a certain control cycle can be used as a reference for subsequent transient control.

[0105] In some implementations, the preset stability conditions may include at least one of the following: the outlet dew point does not show a continuous deterioration trend during the control cycle, the actuator does not reach the saturation boundary, the dew point improvement rate is not lower than the preset lower limit, and the regeneration exhaust state does not show abnormal fluctuations.

[0106] A control cycle that meets preset stability conditions can have a split ratio that can relatively stably reflect the coordination relationship between front-end regulation and regenerative regulation, making it suitable as a source of transient split ratios during freeze updates.

[0107] Freezing the split ratio update means that when neither the first preset condition nor the second preset condition is met, and the absolute value of the dew point deviation at the outlet of the downstream dehumidifier continues to increase in multiple consecutive sampling cycles, it can be determined that the current split ratio correction may be in an unstable or mismatched state.

[0108] In this case, freezing the split ratio update in the current control cycle and retaining the split ratio in the most recent control cycle that meets the preset stability conditions as the transient split ratio helps to avoid the split ratio from oscillating continuously during abnormal phases.

[0109] In a frozen state, prioritizing the increase of the heat storage and release distribution ratio within the regeneration regulation gap helps to quickly restore the regeneration capacity of subsequent stages; once the heat storage and release reaches the regulation boundary, the temperature distribution ratio and / or the regeneration air volume distribution ratio of subsequent stages can be further increased.

[0110] The heat source compensation bias can refer to the amount of waste heat reduction that can be converted into a heat source compensation bias and added to the regeneration regulation gap ratio when a decrease in waste heat supply is detected, in order to compensate for the decrease in downstream regeneration capacity caused by fluctuations in external heat sources.

[0111] When residual heat recovery is detected, the heat source compensation bias can be gradually reduced according to a preset withdrawal slope to avoid fluctuations in regeneration capacity due to excessively rapid withdrawal of compensation caused by heat source recovery. The preset withdrawal slope can be set according to the heat source recovery speed, regeneration side inertial characteristics, and outlet dew point stability requirements.

[0112] Accordingly, the system transitions to a hold control state, including: Fuzzy PID control is executed based on the dew point deviation and dew point deviation change rate of the downstream dehumidifier outlet, and the sampling period of the fuzzy PID control is set. When the dew point at the downstream dehumidifier outlet is close to the preset error range of the target dew point value, the adjustment step size corresponding to the front-end adjustment gap and the regeneration adjustment gap is reduced, and the front-end adjustment and regeneration adjustment are subjected to amplitude limiting linkage control. During the holding control phase, the air state at the downstream dehumidifier inlet and the downstream regeneration capacity are continuously adjusted so that the dew point at the downstream dehumidifier outlet is maintained within the preset error range of the target dew point value. The dew point deviation change rate is determined based on the change in the downstream dehumidifier outlet dew point deviation in adjacent control cycles and the control cycle duration.

[0113] In this embodiment, maintaining control state refers to the system transitioning from the large deviation adjustment stage to the small deviation maintenance stage after the dew point at the outlet of the downstream dehumidifier enters the preset error range of the target dew point value.

[0114] Under controlled conditions, the control objective changes from eliminating dew point deviation as quickly as possible to suppressing dew point fluctuations, reducing regulation oscillations, and maintaining a balance between system energy consumption and control accuracy.

[0115] Fuzzy PID control refers to dynamically tuning the proportional, integral, and derivative parameters based on the dew point deviation and its rate of change at the outlet of the downstream dehumidifier, in order to adapt to the nonlinearity, time delay, and coupling of the system under different operating conditions.

[0116] The sampling period of fuzzy PID control can be set according to the system response speed, sensor refresh cycle and actuator operation frequency.

[0117] Limiting linkage control refers to setting adjustment amplitude limits for both front-end regulation and regenerative regulation during the holding control phase, and implementing linkage suppression or linkage compensation when both approach the regulation boundary on one side or show an over-adjustment trend.

[0118] For example, when the regenerative regulation is close to its regulation boundary, the increase in the front-end regulation step size can be limited simultaneously to avoid the front-end operating conditions changing too quickly and causing the subsequent regenerative side to be unable to match; conversely, when the front-end regulation is close to the boundary, the abrupt change in the regenerative regulation can also be limited simultaneously to avoid the control rhythm on both sides becoming unbalanced.

[0119] The aforementioned amplitude-limiting linkage control can reduce the oscillation risk during the holding control phase and improve the stability of the outlet dew point maintenance.

[0120] Furthermore, the preset error range for approaching the target dew point value can be understood as a state where the dew point at the outlet of the downstream dehumidifier has entered the preset error range, or is less than a preset proximity threshold from the boundary of the preset error range. In this state, reducing the adjustment step size corresponding to the front-end adjustment gap and the regeneration adjustment gap helps to reduce overshoot and improve the stability of dew point control.

[0121] See Figure 3 , Figure 3 This is a schematic diagram illustrating the principle of fuzzy PID control provided in an embodiment of this application.

[0122] The PID fuzzy controller has an initial setpoint. Based on the dew point setpoint (-40℃ to 60℃), multi-point temperature sensor signals (±0.1℃), humidity load feedback signal, and parameters from the dehumidifier outlet humidity / temperature sensor, it adjusts or maintains its initial setpoint.

[0123] Accordingly, it can perform operations of the zoned electric heater, the variable frequency motor (adjusting the speed of the impeller), and the phase change heat storage module, thereby stabilizing the dew point temperature within the set range.

[0124] Taking a lithium battery cathode material production plant (environmental parameters: outdoor summer temperature 35℃ / relative humidity 75%, target dew point -55℃, air supply volume 5000m³ / h) as an example, the implementation method of the present invention is explained.

[0125] 1) System initialization and parameter setting Operators set the dew point target value to -55℃ via the touchscreen, with an allowable deviation of ±2℃; The intelligent control unit performs a power-on self-test: verifying the communication status of the sensors (6 temperature nodes, 1 dew point node, 3 humidity nodes, and 1 flow node), and entering the operating mode after confirming that all are online; Initialize PID fuzzy controller parameters: Kp0=2.5, Ki0=0.3, Kd0=0.8 (based on system identification pre-tuning values), fuzzy rule base loading complete.

[0126] 2) Dehumidification process (normal operating conditions) Outdoor fresh air (35℃ / 75%RH) is purified by a filter and then enters the antifreeze surface cooler, where it is pre-cooled to 8℃ by a chiller unit (7℃ chilled water), reducing its moisture content.

[0127] Pre-cooled fresh air enters the pre-stage dehumidification zone (silica gel-activated carbon composite adsorption layer). The pre-stage rotor runs at a speed of 1.0 r / h, and the moisture content at the outlet continues to decrease (relative humidity of about 15-20%). The corresponding temperature rises to about 50℃ due to adsorption heat.

[0128] The pre-stage outlet air passes through a two-stage plate heat exchanger (exchanging heat with the fresh air section and recovering cold energy), and the temperature drops to 30-35℃ before entering the post-stage rotary dehumidification zone (molecular sieve-alumina composite adsorption layer). The post-stage rotary dehumidifier runs at a speed of 1.5r / h, and the outlet dew point drops to -56℃ (reaching the set value range).

[0129] The clean, dry air, after being dehumidified in the subsequent stage, is delivered into the target production area.

[0130] 3) Regeneration process (reverse regeneration) The regenerated air flows in the opposite direction (relative to the direction of the dehumidifying air) from the inlet of the regeneration zone of the rear rotor. The outlet regeneration exhaust air temperature is about 75-85℃. The heat is transferred to the regeneration inlet air preheating section through the heat pipe heat exchanger (first-stage waste heat recovery). The heat exchange heat is about 8-12kW.

[0131] The preheated regeneration air intake (55-65℃) is then heated to 130℃ by the downstream rotor frequency converter electric heater (working power 12kW) before entering the upstream rotor regeneration zone.

[0132] The exhaust air from the pre-stage rotor regeneration outlet (70-80℃) replenishes heat to the phase change heat storage module through a heat pipe heat exchanger (heat storage mode). The paraffin-expanded graphite composite material completes latent heat storage in the phase change range of 68-72℃.

[0133] 4) Working process of the intelligent control unit (PID fuzzy control closed loop) The controller continuously reads the measured dew point value (e.g., -52℃) at the downstream outlet with a sampling period of 100ms. The deviation e is compared with the set value (-55℃) to obtain a deviation of -3℃ and a deviation change rate de / dt = -0.1℃ / s (the dew point is improving towards the target).

[0134] By fuzzifying e (-3℃) and de / dt (-0.1℃ / s), we can deduce ΔKp=+0.3, ΔKi=+0.05, and ΔKd=-0.1. The PID parameters are then updated to Kp=2.8, Ki=0.35, and Kd=0.7.

[0135] The PID controller calculates three output commands: 1) The speed of the downstream impeller is increased to 1.8 r / h (to increase the adsorption capacity); 2) The power of the downstream heater is increased to 14 kW (to enhance the regeneration efficiency); 3) The opening of the proportional control valve of the phase change heat storage module is increased to 75% (to increase the heat exchange flow and accelerate the release of heat into the regeneration air intake).

[0136] After about 15-20 minutes (due to system thermal inertia), the dew point at the downstream outlet drops to -55℃, the controller enters the fine-tuning and holding mode, the rotor speed is reduced to 1.5r / h, the heating power is reduced to 11kW, and the valve opening stabilizes at 60%.

[0137] 5) Waste heat fluctuation response (phase change heat storage buffer condition) When the factory production line stops (such as during shift changes), the supply of waste heat is interrupted, and the heat exchange capacity of the heat pipe heat exchanger drops to 0.

[0138] The intelligent control unit detected that the outlet temperature of the phase change heat storage module dropped rapidly from 68°C, triggering a "insufficient residual heat" warning. The heat storage module then entered the heat release mode (valve fully open, 100% opening).

[0139] The phase change material releases heat when it solidifies from a liquid state, maintaining the regeneration preheating air inlet temperature at 55-60℃. At the same time, the power of the variable frequency electric heater is automatically increased (up to 9kW for the front stage and 15kW for the rear stage) as a supplement.

[0140] Within approximately 2 hours (depending on the heat storage capacity), the system dew point temperature is maintained within the range of -54℃ to -56℃, with fluctuations meeting the ±2℃ target. After the production line restarts, the residual heat is restored, the heat storage module automatically switches back to heat storage mode, and the electric heating power gradually decreases.

[0141] 1) Dehumidification process: After being purified by the fresh air filter, the outdoor fresh air enters the anti-freeze surface cooler and is pre-cooled to 5-10℃. Then, it passes through the front-stage rotary dehumidification zone (removing more than 80% of the moisture) and the rear-stage rotary dehumidification zone (the dew point is reduced to below -60℃) in sequence, and is finally sent to the target area. The coldness of the dehumidified dry air is recovered to the fresh air section through the plate heat exchanger.

[0142] 2) Regeneration process: The regeneration air is first preheated to 55-65℃ by the waste heat stored in the phase change heat storage module in the preheating section, and then precisely heated by the partitioned heating section (regeneration temperature of the downstream rotor is 120-140℃, and the regeneration temperature of the upstream rotor is 90-110℃). Then it flows in the reverse direction through the downstream rotor regeneration zone and the upstream rotor regeneration zone to complete the adsorbent desorption. The regeneration exhaust air (70-90℃) is discharged after releasing heat through the heat pipe heat exchanger.

[0143] 3) Intelligent control: When the waste heat supply is sufficient, the phase change heat storage module stores excess heat; when the waste heat is insufficient, it releases the stored heat and works with the frequency converter electric heater to supplement the heat, ensuring stable regeneration temperature.

[0144] The dew point air treatment method has been described in detail above through some embodiments. In order to enable those skilled in the art to better understand and implement it, the corresponding device is also described in detail below through some embodiments.

[0145] See Figure 4 , Figure 4 This is a schematic diagram of the structure of a dew point air treatment device provided in an embodiment of this application, as shown below. Figure 4As shown, the dew point air handling unit may include: a fresh air pre-cooling unit 410, a pre-dehumidification unit 420, a heat exchange unit 430, a post-dehumidification unit 440, a regeneration unit 450, a heat storage unit 460, a detection unit 470, and a control unit 480. The fresh air pre-cooling unit 410, the pre-dehumidification unit 420, the heat exchange unit 430 and the post-dehumidification unit 440 are connected in sequence to perform graded dehumidification treatment on the fresh air and output low dew point air. The regeneration unit 450 is connected to the pre-stage dehumidification unit 420 and the post-stage dehumidification unit 440 respectively, and is used to regenerate the pre-stage dehumidification unit 420 and the post-stage dehumidification unit 440. The heat storage unit 460 is connected to the regeneration unit 450 and is used to provide heat release or store regenerated waste heat to the regeneration unit 450. The detection unit 470 is used to collect the air state parameters at the inlet of the downstream dehumidifier, the dew point parameters at the outlet of the downstream dehumidifier, and the regeneration state parameters of the downstream dehumidifier. The control unit 480 is connected to the detection unit 470, the fresh air pre-cooling unit 410, the pre-dehumidification unit 420, the heat exchange unit 430, the post-dehumidification unit 440, the regeneration unit 450, and the heat storage unit 460, and is configured to perform the method described in any of the foregoing embodiments.

[0146] For further details regarding the fresh air pre-cooling unit 410, the pre-dehumidification unit 420, the heat exchange unit 430, the post-dehumidification unit 440, the regeneration unit 450, the heat storage unit 460, the detection unit 470, and the control unit 480, please refer to the aforementioned examples.

[0147] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0148] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for treating dew point air, characterized in that, include: Acquire status parameters, including the inlet air status parameters of the downstream dehumidifier, the outlet dew point parameters of the downstream dehumidifier, and the regeneration status parameters of the downstream stage; A downstream dehumidification gap is formed based on the target dew point value and the aforementioned state parameters; The downstream dehumidification gap is divided into a front-end adjustment gap and a regeneration adjustment gap; The front-end adjustment notch is used to adjust the inlet air state of the subsequent dehumidification stage, and the regeneration adjustment notch is used to adjust the regeneration capacity of the subsequent stage. Based on the adjusted dew point change at the downstream dehumidifier outlet, the splitting ratio of the upstream adjustment gap and the regeneration adjustment gap is corrected, and the gap splitting ratio in the next control cycle is adjusted accordingly until the downstream dehumidifier outlet dew point enters the preset error range of the target dew point value. After entering the preset error range, the system switches to a hold control state. The downstream dehumidifier outlet dew point change is determined based on the changes in the collected downstream dehumidifier outlet dew point parameters before and after adjustment or between adjacent control cycles.

2. The dew point air treatment method according to claim 1, characterized in that, The step of forming the subsequent dehumidification gap based on the target dew point value and the state parameters includes: The target inlet status window and target regeneration capacity window are formed based on the target dew point value to correspond to the subsequent dehumidification stage. The inlet air state parameters of the downstream dehumidifier are compared with the target inlet state window to obtain the downstream inlet state deviation; The subsequent regeneration state parameters are compared with the target regeneration capacity window to obtain the subsequent regeneration capacity deviation; The dew point parameter at the outlet of the downstream dehumidifier is compared with the target dew point value to obtain the dew point deviation at the outlet of the downstream dehumidifier. The deviation of the downstream inlet state, the deviation of the downstream regeneration capacity, and the deviation of the downstream dehumidification outlet dew point are combined to obtain the downstream dehumidification gap.

3. The dew point air treatment method according to claim 2, characterized in that, The inlet air state parameters of the post-dehumidification stage include the inlet air temperature, the inlet air humidity, and the inlet air volume; the post-regeneration state parameters include the post-regeneration temperature, the post-regeneration air volume, and the regeneration exhaust state parameters; the regeneration exhaust state parameters include the regeneration exhaust temperature and the regeneration exhaust humidity. The formation of the target entry status window and the target regeneration capability window includes: The target inlet status window is formed based on the target dew point value, the characteristic parameters of the downstream dehumidification material, the inlet air temperature of the downstream dehumidification, the moisture content of the inlet air of the downstream dehumidification, and the air volume of the inlet air of the downstream dehumidification. The target regeneration capacity window is formed based on the downstream regeneration temperature, the downstream regeneration air volume, the regeneration exhaust temperature, the humidity state of the regeneration exhaust, and the releaseable heat of the heat storage module.

4. The dew point air treatment method according to claim 3, characterized in that, The deviation fusion includes: The fusion weights of the downstream inlet state deviation, the downstream regeneration capacity deviation, and the downstream dehumidification outlet dew point deviation are adjusted based on the dew point improvement rate over multiple consecutive control cycles. The post-stage inlet state deviation, the post-stage regeneration capacity deviation, and the post-stage dehumidification outlet dew point deviation are weighted and fused according to the adjusted fusion weights to obtain the post-stage dehumidification gap; The improvement amount of the dew point at the outlet of the downstream dehumidifier is determined based on the change in the dew point at the outlet of the downstream dehumidifier, and the dew point improvement rate is determined based on the improvement amount of the dew point at the outlet of the downstream dehumidifier and the control cycle duration.

5. The dew point air treatment method according to claim 1, characterized in that, The step of splitting the downstream dehumidification gap into a front-end adjustment gap and a regeneration adjustment gap includes: The changes in the outlet status of the pre-stage dehumidifier, the improvement in the dew point at the outlet of the post-stage dehumidifier, and the changes in the regeneration exhaust status were collected. Based on the change in the state of the pre-stage dehumidifier outlet, the improvement in the dew point of the post-stage dehumidifier outlet, and the change in the state of the regeneration exhaust air, determine the initial split ratio between the front-end regulation gap and the regeneration regulation gap. Within the rolling time window, the initial split ratio is corrected by combining the split ratios of the previous few control cycles to obtain the split ratio of the current control cycle. The front-end adjustment gap and the regeneration adjustment gap are formed according to the revised split ratio; The rolling time window covers at least one system thermal inertia response cycle, and the change in regenerative exhaust state is determined based on the changes in the collected regenerative exhaust state parameters before and after adjustment or between adjacent control cycles.

6. The dew point air treatment method according to claim 2, characterized in that, The method of adjusting the inlet air state of the subsequent dehumidification stage using the front-end adjustment notch includes: Adjust at least one of the following according to the priority order: fresh air pre-cooling intensity, pre-stage dehumidification capacity, and air heat exchange state before entering the post-stage dehumidification section; When the previous priority adjustment reaches the preset adjustment boundary and the air state at the inlet of the subsequent dehumidification stage has not yet entered the target inlet state window, the subsequent priority adjustment is triggered. The pre-cooling intensity of the fresh air is adjusted by regulating the refrigerant supply to the surface cooler and / or the setpoint of the air temperature at the surface cooler outlet. The pre-stage dehumidification capacity is adjusted by coordinating at least two of the pre-stage impeller speed, pre-stage regeneration temperature, and pre-stage regeneration air volume. The air heat exchange state is adjusted by adjusting the heat exchange capacity of the plate heat exchanger and / or the bypass ratio.

7. The dew point air treatment method according to claim 2 or 6, characterized in that, The method of adjusting the regeneration capacity of the subsequent stage using the regeneration adjustment gap includes: Adjust at least one of the following in order of priority: heat storage and release, subsequent regeneration air volume, and subsequent regeneration temperature; When the previous priority adjustment reaches the preset adjustment boundary and the subsequent regeneration capability has not yet entered the target regeneration capability window, the next priority adjustment is triggered. The post-regeneration capacity is regulated by at least two of the following: post-regeneration temperature, post-regeneration air volume, and heat storage and release. A silica gel-activated carbon composite adsorption material is used to form the pre-stage rotor, and a molecular sieve-alumina composite adsorption material is used to form the post-stage rotor, with the regeneration temperature of the post-stage rotor being higher than that of the pre-stage rotor.

8. The dew point air treatment method according to claim 2, characterized in that, The step of feeding back and correcting the splitting ratio of the front-end adjustment gap and the regeneration adjustment gap based on the adjusted dew point change at the downstream dehumidifier outlet, and accordingly adjusting the gap splitting ratio in the next control cycle, includes: The first feedback correction is performed based on the change in the dew point at the outlet of the adjusted downstream dehumidifier, and the second feedback correction is performed based on the change in the state of the adjusted regeneration exhaust air. When both the first preset condition corresponding to the first feedback correction and the second preset condition corresponding to the second feedback correction are met, the front-end regulation gap ratio and the regenerative regulation gap ratio in the current control cycle remain unchanged, and the current split ratio is used as the benchmark split ratio for the next control cycle. When the first preset condition is met but the second preset condition is not met, the proportion of regenerative adjustment gap in the next control cycle is reduced by a preset first correction step, and the proportion of front-end adjustment gap is increased by a compensation amount corresponding to the first correction step. When the second preset condition is met but the first preset condition is not met, the proportion of the front-end adjustment gap in the next control cycle is reduced by a preset second correction step size, and the proportion of the regenerative adjustment gap is increased by a compensation amount corresponding to the second correction step size. When neither the first preset condition nor the second preset condition is met, and the absolute value of the dew point deviation at the outlet of the downstream dehumidifier continues to increase within multiple consecutive sampling cycles, the split ratio update in the current control cycle is frozen, and the split ratio in the control cycle that most recently met the preset stability condition is retained as the transient split ratio. Under the transient split ratio, the heat storage and heat release distribution ratio inside the regeneration adjustment gap is preferentially increased. When the heat storage and release reaches the preset adjustment boundary and the subsequent regeneration capacity still has not entered the target regeneration capacity window, increase the subsequent regeneration temperature distribution ratio and / or subsequent regeneration air volume distribution ratio within the regeneration adjustment gap. When a decrease in waste heat supply is detected, the decrease in waste heat is converted into a heat source compensation bias, and the heat source compensation bias is added to the regeneration regulation gap ratio. When residual heat recovery is detected, the heat source compensation bias is gradually reduced according to the preset pullback slope, and the freeze on the split ratio update is lifted after the first preset condition and the second preset condition are satisfied simultaneously again. During the process of adjusting the split ratio, upper limit constraints, lower limit constraints, and single-cycle maximum change constraints are set for the front-end adjustment gap ratio and the regeneration adjustment gap ratio, respectively, and the sum of the adjusted front-end adjustment gap ratio and the regeneration adjustment gap ratio is kept constant. The results of the regeneration exhaust status change are determined based on the changes in the collected regeneration exhaust status parameters before and after adjustment or between adjacent control cycles.

9. The dew point air treatment method according to claim 1 or 8, characterized in that, The transition to the hold control state includes: Fuzzy PID control is executed based on the dew point deviation and dew point deviation change rate at the outlet of the downstream dehumidifier, and the sampling period of the fuzzy PID control is set. When the dew point at the outlet of the downstream dehumidifier is close to the preset error range of the target dew point value, the adjustment step size corresponding to the front-end adjustment gap and the regeneration adjustment gap is reduced, and the front-end adjustment and regeneration adjustment are subject to amplitude-limiting linkage control. During the control phase, the inlet air condition and regeneration capacity of the downstream dehumidifier are continuously adjusted to keep the outlet dew point of the downstream dehumidifier within the preset error range of the target dew point value. The dew point deviation change rate is determined based on the change in dew point deviation at the outlet of the subsequent dehumidifier in adjacent control cycles and the duration of the control cycle.

10. A dew point air treatment device, characterized in that, include: The system includes a fresh air pre-cooling unit, a pre-dehumidification unit, a heat exchange unit, a post-dehumidification unit, a regeneration unit, a heat storage unit, a detection unit, and a control unit. The fresh air pre-cooling unit, the pre-dehumidification unit, the heat exchange unit, and the post-dehumidification unit are connected in sequence to perform graded dehumidification treatment on the fresh air and output low dew point air. The regeneration unit is connected to the pre-dehumidification unit and the post-dehumidification unit respectively, and is used to regenerate the pre-dehumidification unit and the post-dehumidification unit; The heat storage unit is connected to the regeneration unit and is used to provide heat release or store waste heat from regeneration to the regeneration unit. The detection unit is used to collect the air state parameters at the inlet of the downstream dehumidifier, the dew point parameters at the outlet of the downstream dehumidifier, and the regeneration state parameters of the downstream dehumidifier. The control unit is connected to the detection unit, the fresh air pre-cooling unit, the pre-dehumidification unit, the heat exchange unit, the post-dehumidification unit, the regeneration unit, and the heat storage unit, and is configured to perform the method described in any one of claims 1 to 9.

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