A sewage treatment plant ultraviolet disinfection energy saving and consumption reducing control method and system

Abstract

The application discloses a kind of sewage treatment plant ultraviolet disinfection energy-saving control method and system, it is related to intelligent control technical field, including obtaining the operating parameter of ultraviolet disinfection equipment in sewage treatment process and pre-processing, obtain normalized data;The cumulative running time of lamp tube is obtained, and the aging state of each lamp tube is determined based on the cumulative running time, and the power modeling is carried out for lamp tube in combination with normalized data, the running power set value of lamp tube is generated to be constrained, and the final power set value is obtained to be continuously controlled;Based on control result, lamp tube running state is judged to carry out lamp tube start-stop control, after lamp tube control is formed, disinfection effect deviation is obtained to modify final power set value and correct, to ensure that disinfection is up to standard, the present application effectively reduces energy consumption under the premise of ensuring that effluent is up to standard, and realizes the fine management of equipment maintenance, avoid the increase of hidden energy consumption due to pollution.

Description

Technical Field

[0001] This invention relates to the field of intelligent control technology, and in particular to a method and system for energy-saving and consumption-reducing control of ultraviolet disinfection in sewage treatment plants. Background Technology

[0002] With the continuous expansion of urban sewage treatment scale and the constant improvement of discharge standards, ultraviolet (UV) disinfection technology has been widely applied to the effluent disinfection stage of sewage treatment plants due to its advantages such as no secondary pollution, high sterilization efficiency, and relatively simple operation and management. In existing engineering applications, UV disinfection systems typically consist of several UV lamp modules, which inactivate microorganisms in the water by emitting 254nm wavelength ultraviolet light. To ensure disinfection effectiveness, some systems adopt a fixed power operation mode, maintaining a constant power output of the lamps throughout the entire operating cycle; other systems use single-factor adjustment methods based on flow rate (pacing control) or ultraviolet transmittance (UVT), making simple adjustments to the lamp start / stop or power according to changes in water volume or quality. In recent years, with the development of electronic dimming ballasts and online monitoring technology, systems capable of continuous lamp power adjustment have also emerged, providing a technical basis for energy-saving operation of UV disinfection.

[0003] However, existing technologies do not consider the light decay effect of lamps over time. Different lamps operate at the same power under the same control strategy, resulting in new lamps having significant over-output and old lamps having insufficient output. This increases overall energy consumption and reduces disinfection stability. Furthermore, existing control methods based on flow rate or UVT usually do not achieve multi-factor coupling regulation, making it difficult to accurately match when water quality, water quantity, and equipment status change simultaneously. This can easily lead to power regulation lag or over-compensation. Summary of the Invention

[0004] In view of the aforementioned existing problems, the present invention is proposed.

[0005] Therefore, the present invention provides a method and system for energy saving and consumption reduction control of ultraviolet disinfection in sewage treatment plants, which solves the problems of existing technologies not considering the light decay effect of lamps over time and the tendency for power adjustment to lag or over-compensation.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] In a first aspect, the present invention provides a method for energy-saving and consumption-reducing control of ultraviolet disinfection in wastewater treatment plants, comprising,

[0008] The operating parameters of the ultraviolet disinfection equipment during the wastewater treatment process are obtained and preprocessed to obtain normalized data, including normalized flow rate and normalized transmittance.

[0009] After obtaining the cumulative running time of the lamps and determining the aging state of each lamp based on the cumulative running time, power modeling is performed for the lamps using normalized data, generating the lamps' operating power setpoints for constraint, and finally obtaining the final power setpoints for continuous control.

[0010] Based on the control results, the lamp operating status is determined and the lamp start-stop control is performed. After the lamp control is formed, the deviation of the disinfection effect is obtained and the final power setting value is corrected to ensure that the disinfection standard is met.

[0011] During the correction process, a correction judgment value is calculated, and a preset judgment threshold is used to determine whether the quartz sleeve of the lamp tube is contaminated, so as to maintain the achieved energy-saving effect.

[0012] As a preferred embodiment of the wastewater treatment plant ultraviolet disinfection energy saving and consumption reduction control method of the present invention, the step of obtaining normalized data by preprocessing the operating parameters of the ultraviolet disinfection equipment during the wastewater treatment process involves installing an electromagnetic flow meter on the inlet pipe before the wastewater enters the ultraviolet disinfection channel, setting an online ultraviolet transmittance detector at the inlet end of the ultraviolet reactor, and setting a multi-point distributed ultraviolet intensity probe at the outlet of the ultraviolet reactor.

[0013] Flow data of the inlet pipe is collected using an electromagnetic flow meter; transmittance of the inlet end of the ultraviolet reactor is collected using an online ultraviolet transmittance meter.

[0014] Outlier removal and normalization are performed on all data to obtain normalized data, including normalized flow rate and normalized transmittance.

[0015] As a preferred embodiment of the ultraviolet disinfection energy-saving and consumption-reducing control method for sewage treatment plants described in this invention, the cumulative running time of the lamps is obtained by installing ballasts on the lamps and embedding a running timer in the ballasts, and obtaining the cumulative running time of each lamp through the running timer.

[0016] As a preferred embodiment of the ultraviolet disinfection energy-saving and consumption-reducing control method for wastewater treatment plants described in this invention, the step of determining the aging state of each lamp based on cumulative operating time, and then performing power modeling for the lamps using normalized data to generate lamp operating power setpoints, is as follows:

[0017] Calculate the light decay coefficient of each lamp based on the cumulative operating time;

[0018] By a preset segmentation threshold and Based on the light decay coefficient, the lamps are classified to obtain the classification results, including old lamps, medium lamps, and new lamps;

[0019] Based on normalized data, power modeling is performed for each lamp in the partitioning results to generate operating power setpoints.

[0020] As a preferred embodiment of the ultraviolet disinfection energy-saving and consumption-reducing control method for sewage treatment plants described in this invention, the continuous control of obtaining the final power setpoint involves constraining the operating power setpoint. After forming the final power setpoint, the PLC repeatedly performs data acquisition, status evaluation, and power calculation according to a set cycle to obtain the final power setpoint, which is then output to the ballast. The ballast adjusts the input current of each lamp to achieve continuous control of the output power of each lamp.

[0021] As a preferred embodiment of the ultraviolet disinfection energy-saving and consumption-reducing control method for wastewater treatment plants described in this invention, the step of determining the lamp operating status and controlling the lamp start-stop, and after forming lamp control, obtaining the disinfection effect deviation, and making corrections to the final power setting value, is as follows:

[0022] Extract the normalized flow rate from the normalized data and compare it with the preset control threshold to generate the lamp control result;

[0023] The measured ultraviolet intensity is obtained, and combined with the preset target disinfection intensity reference value, the disinfection effect deviation is calculated to perform disinfection intensity judgment. Based on the judgment result, the power correction amount is calculated to correct the final power setting value of the lamp tube, and the corrected power value is obtained.

[0024] As a preferred embodiment of the ultraviolet disinfection energy-saving and consumption-reducing control method for wastewater treatment plants described in this invention, the calculation correction judgment value is obtained by re-acquiring the overall effluent ultraviolet intensity value and normalized transmittance, and determining the current transmittance efficiency ratio through a preset clean state reference intensity; subsequently, transmittance correction is performed in combination with the normalized transmittance to obtain the correction judgment value.

[0025] As a preferred embodiment of the ultraviolet disinfection energy-saving and consumption-reducing control method for sewage treatment plants described in this invention, wherein: determining whether the quartz sleeve of the lamp tube is contaminated by a preset judgment threshold involves setting a judgment threshold and comparing the corrected judgment value with the judgment threshold.

[0026] If the correction value is less than the judgment threshold, it indicates that the quartz sleeve is contaminated; otherwise, it indicates that the quartz sleeve is not contaminated.

[0027] As a preferred embodiment of the ultraviolet disinfection energy-saving and consumption-reducing control method for sewage treatment plants described in this invention, when the quartz sleeve is contaminated, an alarm signal is sent to the host computer via PLC, and then the host computer displays a cleaning prompt on the operation interface. At the same time, an audible and visual alarm is triggered, and the alarm time and the corresponding equipment number are recorded.

[0028] Secondly, this invention provides an energy-saving and consumption-reducing control system for ultraviolet disinfection in wastewater treatment plants, comprising:

[0029] The data acquisition module is used to acquire the operating parameters of the ultraviolet disinfection equipment during the sewage treatment process, perform preprocessing, and obtain normalized data, including normalized flow rate and normalized transmittance.

[0030] The modeling constraint module is used to obtain the cumulative running time of the lamps, and after determining the aging state of each lamp based on the cumulative running time, it combines normalized data to perform power modeling for the lamps, generates the lamp's operating power setpoint for constraint, and obtains the final power setpoint for continuous control.

[0031] The start-stop correction module is used to determine the lamp operating status based on the control results and control the lamp start-stop. After the lamp control is formed, the deviation of the disinfection effect is obtained and the final power setting value is corrected to ensure that the disinfection standard is met.

[0032] The contamination determination module is used to calculate the correction determination value during the correction process and determine whether the quartz sleeve of the lamp tube is contaminated through a preset determination threshold, so as to maintain the achieved energy-saving effect.

[0033] The beneficial effects of this invention are as follows: By introducing a light decay coefficient model based on cumulative operating time, this invention quantitatively characterizes the output capacity of each lamp and enables hierarchical management of new, medium, and old lamps, allowing the lamp's operating status to truly reflect its actual output capacity. Furthermore, by integrating normalized flow rate, ultraviolet transmittance, and light decay coefficient to construct a power calculation model and combining it with a safety redundancy coefficient for power optimization, the lamp output dynamically matches the actual disinfection requirements, effectively reducing energy consumption while ensuring that the effluent meets standards. Secondly, by quantitatively determining the contamination status of the quartz sleeve and outputting manual cleaning reminders, this invention achieves refined management of equipment maintenance, avoiding hidden energy consumption increases caused by contamination. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. 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.

[0035] Figure 1 This is a flowchart of the energy-saving and consumption-reducing control method for ultraviolet disinfection in a wastewater treatment plant in Example 1.

[0036] Figure 2 This is a structural diagram of the ultraviolet disinfection energy-saving and consumption-reducing control system for the sewage treatment plant in Example 1.

[0037] Figure 3 This is a flowchart for determining whether the disinfection equipment is contaminated in Example 1. Detailed Implementation

[0038] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0039] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0040] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0041] Example 1, referring to Figures 1-3 This is the first embodiment of the present invention, which provides a method for energy-saving and consumption-reducing control of ultraviolet disinfection in wastewater treatment plants, including the following steps:

[0042] S1. Obtain the operating parameters of the ultraviolet disinfection equipment during the sewage treatment process and preprocess them to obtain normalized data, including normalized flow rate and normalized transmittance;

[0043] Specifically, an electromagnetic flow meter is installed on the inlet pipe before the sewage enters the ultraviolet disinfection channel, an online ultraviolet transmittance detector is installed at the inlet of the ultraviolet reactor, and a multi-point distributed ultraviolet intensity probe is installed at the outlet of the ultraviolet reactor.

[0044] Flow data of the inlet pipe is collected using an electromagnetic flow meter; transmittance of the inlet end of the ultraviolet reactor is collected using an online ultraviolet transmittance meter.

[0045] Outlier removal and normalization are performed on all data to obtain normalized data, including normalized flow rate and normalized transmittance.

[0046] It should be noted that: the flow meter can be an industrial-grade device with a range of 0 to 5000 m³ / h and an accuracy class of ±0.5%, and is connected to the PLC via a 4 to 20mA signal; in actual operation, the PLC reads the flow data with a sampling cycle of 1 minute and stores the data in the historical database; the online ultraviolet transmittance detector can measure the transmittance of water at a wavelength of 254nm, and the output unit is percentage (%), and is also connected to the PLC via an analog interface; secondly, the multi-point distributed ultraviolet intensity probe can be arranged at 3 to 5 measuring points along the water flow direction.

[0047] S2. Obtain the cumulative running time of the lamps, and determine the aging state of each lamp based on the cumulative running time. Then, combine the normalized data to perform power modeling for the lamps, generate the lamp running power setpoint for constraint, and obtain the final power setpoint for continuous control.

[0048] Specifically, a ballast (electronic dimming ballast) is installed on the lamp tube, and a running timer is embedded in the ballast to obtain the cumulative running time of each lamp tube;

[0049] It should be noted that the running timer starts accumulating time when the lamp is lit and stops accumulating time when the lamp is turned off; and the running time data of all lamps is uploaded to the PLC via fieldbus (such as Modbus or Profibus); the PLC assigns a unique number to each lamp and records its accumulated running time in the database.

[0050] S2.1 Calculate the light decay coefficient of each lamp based on the cumulative operating time;

[0051] Specifically, based on the cumulative operating time, the light output capability of each lamp is described using an exponential decay method to obtain the light decay coefficient of each lamp;

[0052] The light decay coefficient is expressed as follows:

[0053]

[0054] In the formula, Indicates at time Time The light decay coefficient of each lamp tube Represents the base of the natural logarithm. Indicates the adjustment factor. Indicates at time Time The cumulative operating time of each lamp;

[0055] It should be noted that: adjustment coefficient This describes how quickly the light output capability of a UV lamp decreases with increasing cumulative operating time during continuous operation; therefore, if the adjustment coefficient... If the value is too large, the model will assume that the lamp decays quickly, thus obtaining a small light decay coefficient in a shorter operating time; conversely, if the coefficient is adjusted... If the value is too small, the model will assume that the lamp decays slowly, thus maintaining a high light decay coefficient over a longer operating period. To ensure that disinfection standards are met while also considering energy saving and lifespan extension, the adjustment coefficient is set as follows: The value range is set to 0.00008~0.00012, with 0.0001 as the default value, so as to match the overall attenuation trend of low-voltage high-intensity lamps in engineering applications.

[0056] S2.2, using a preset segmentation threshold and Based on the light decay coefficient, the lamps are classified to obtain the classification results, including old lamps, medium lamps, and new lamps;

[0057] Specifically, set a threshold for segmentation. and ,and The light decay coefficient and the dividing threshold are used to determine the light decay coefficient. and Compare;

[0058] If the light decay coefficient is less than the threshold If so, then the UV lamp will be used as an old lamp;

[0059] If the light decay coefficient is greater than or equal to the threshold And less than the dividing threshold Then the ultraviolet lamp will be used as the medium lamp;

[0060] If the light decay coefficient is greater than or equal to the threshold If so, then the UV lamp will be used as a new lamp;

[0061] It should be noted that: the threshold for division This is to determine the entry boundary for older lamps; this threshold must be able to reflect a state where the lamp's output capacity is significantly insufficient and needs to be downgraded. If the value is set too low, for example below 0.65, it means that only lamps with extremely severe degradation will be identified as old lamps. This will lead to some clearly aged lamps that have not yet fallen below this lower limit still being used as medium-grade lamps, thus bearing a higher load in actual operation. This will not only cause fluctuations in disinfection dosage but also lead to overly concentrated power compensation, increasing energy consumption and the risk of failure. Conversely, if... If the value is set too high, for example above 0.75, some lamps with good output capacity will be prematurely classified as old lamps, reducing the number of medium-sized lamps. This will force the use of more new lamps to replace them earlier, reducing the balance of new lamp resource utilization and hindering overall lifespan management. Therefore, it is possible to exemplarily set the value as follows: The value range is set between 0.65 and 0.75, with 0.7 taken as the default value to balance the timeliness of old light identification and the economy of system operation; similarly, the threshold is divided. This threshold defines the boundary between new and intermediate lamps; it reflects whether the lamp is still in its high-efficiency output range. If the value is too low, such as below 0.85, many lamps that have already shown significant degradation will still be classified as new lamps. This means that when new lamp groups are prioritized, lamps that should be degraded will continue to receive high-priority tasks, weakening the effect of prioritizing low-load energy-saving operation of the new lamps; if... If the value is too high, for example above 0.95, only a very small number of lamps that have only recently been put into use can be considered new lamps. A large number of lamps that still have high output capacity will be included in the medium-sized lamp category, resulting in too few new lamps and making it difficult to demonstrate the energy-saving advantages of new lamps in prioritizing operation under low flow conditions and low power operation. Therefore, it is possible to exemplarily... The value is limited to 0.85~0.95, and 0.9 is taken as the default value for example, so that the lamps can be better distinguished between the approximate initial output state and the state where considerable attenuation has occurred but still can operate efficiently.

[0062] S2.3 Based on normalized data, model the power of each lamp in the partitioning results and generate the operating power setpoint;

[0063] Specifically, based on the classification of old lamps, medium lamps, and new lamps, and combined with normalized flow rate, transmittance, and light decay coefficient, the power of each lamp is modeled, and the operating power setpoint of each lamp is calculated.

[0064] The operating power setpoint is expressed as follows:

[0065]

[0066] In the formula, Indicates the first The operating power setting value for each lamp tube. This indicates the rated power of the lamp. Represents normalized flow. Represents normalized transmittance. Indicates the safety redundancy coefficient;

[0067] It should be noted that: safety redundancy coefficient It is not used to change the physical meaning of flow rate, transmittance, or light decay, but rather to appropriately amplify the final required power for safety after these factors have been included in the calculation;

[0068] For example, in one implementation, when the influent water quality of the wastewater treatment plant is relatively stable, the UVT variation is small, and the accuracy of the online monitoring device is high, the safety redundancy coefficient can be exemplarily increased. Choose a value close to 1.05 to highlight the energy-saving effect; when the influent water quality fluctuates greatly, the rainy season shock load is significant, or the disinfection compliance requirements are strict, the safety redundancy factor can be increased as an example. A value close to 1.15 or even 1.2 is chosen to improve the system's safety margin; and to avoid an imbalance between the theoretical power at the front end and the constraint control at the back end, adjustments can be made in the range of 1.05 to 1.2.

[0069] Furthermore, the operating power setting value is constrained to form the final power setting value;

[0070] The PLC repeatedly performs data acquisition, status evaluation (old lamps, medium lamps, new lamps) and power calculation (light decay coefficient to final power setting value) according to a set cycle. The final power setting value is then output to the ballast, which adjusts the input current of each lamp to achieve continuous control of the output power of each lamp.

[0071] The final power setpoint is expressed as follows:

[0072]

[0073] In the formula, Indicates the first The final power setting value for each lamp tube. This indicates the operation of finding the minimum value. This indicates the operation of retrieving the maximum value. , These represent the minimum and maximum operating power limits for the lamp, respectively.

[0074] It should be noted that the setting cycle of the PLC directly affects the system's response speed and stability. If the cycle is too long, it will be unable to respond to changes in flow and water quality in a timely manner. If the cycle is too short, it will increase the system's computational burden and may cause control oscillations. Therefore, considering the slow rate of change in the sewage treatment system, the setting cycle can be limited to 1 to 10 seconds, for example.

[0075] It should also be noted that the minimum operating power limit for the lamp tubes is... The minimum stable drive requirement for low-voltage high-intensity lamps can be set based on the industrial-grade electronic ballast. For example, in actual operation, although electronic dimming ballasts can achieve continuous adjustment of lamp power, when the power drops below 20% of the rated power, some low-voltage high-intensity UV lamps will experience unstable arc maintenance, difficulty in ignition, and non-linear output decline. Therefore, the minimum operating power limit can be set accordingly. An example setting is 0.2;

[0076] Maximum operating power limit of lamp tube The value can be selected at a better compromise between lamp heat load and life loss. For example, in a wastewater disinfection scenario with long-term continuous operation, if the rated power is close to or reaches 100% for a long time, it will not only increase the lamp heat load and electrode loss, but also accelerate the temperature rise effect caused by scaling of the quartz sleeve, thereby accelerating light decay, shortening life, and increasing the probability of failure. In order to give the lamp a certain heat margin and life margin, 0.85 can be taken as the default value for example.

[0077] S3. Based on the control results, determine the lamp operating status and control the lamp start and stop. After forming the lamp control, obtain the disinfection effect deviation and make correction judgments and corrections to the final power setting value to ensure that the disinfection standard is met.

[0078] S3.1 Extract the normalized flow rate from the normalized data and compare it with the preset control threshold to generate the lamp control result;

[0079] Specifically, after adjustment and control, the normalized flow rate is extracted;

[0080] Set a control threshold and compare the normalized flow rate with the control threshold;

[0081] If the normalized flow rate is less than the control threshold, it is determined that the current operation is in a low-load state, and the PLC will execute the control operation of enabling new and medium lamps while keeping the old lamps off.

[0082] If the normalized flow rate is greater than or equal to the control threshold, it is determined that the current operation is in a medium-high load state. The old lamps are put into operation in sequence according to the lamp number by the PLC, and their operating power is set to the corresponding final power setting value. Then, the new lamp group and the medium lamp group continue to operate.

[0083] It should be noted that during the start-up and shutdown of the lamp assembly, in order to avoid current surges and lamp life loss, a gradual dimming method can be used instead of direct start-up and shutdown.

[0084] Specifically, when a lamp group needs to be put into operation, the PLC first starts the lamps at 20% of the rated power, and then gradually increases the power to the final set value in a linear increment over 30 seconds. If a lamp needs to be shut down, the process is reversed, that is, the power is gradually reduced from the current level to 20% before the lamp is turned off, thus avoiding the adverse effects of frequent start-stop cycles.

[0085] Secondly, in order to achieve a balanced lamp life, a rotation mechanism needs to be introduced into the lamp group control. For example, the PLC can set a uniform operating cycle for each old, medium, and new lamp, and prioritize the lamps with shorter cumulative operating time according to the order of operating time. When the set cycle is reached, the PLC will automatically rotate the lamps, that is, switch some operating lamps to standby mode, and at the same time enable standby lamps to participate in the operation, so that the cumulative operating time of each lamp tends to be consistent, and avoid premature aging of some lamps.

[0086] It should also be noted that the control threshold is used to divide the low-load operating range and the medium-to-high-load operating range. For example, the range of the control threshold can be set to 0.48~0.55. If the threshold is lower than 0.48, the determination of the medium-to-high load state is too slow, which will cause the system to still rely on new and medium lamps to operate under medium flow conditions, thus forcing the already running lamps to maintain a high output for a long time, which is not conducive to lamp life and compliance margin. If the threshold is higher than 0.55, the old lamps are put into use too early, and inefficient lamps are introduced under a large number of medium-to-low flow conditions, which is not conducive to energy saving. Therefore, in order to achieve the overall goal of prioritizing the use of high-efficiency lamp groups under low load and then introducing old lamps to compensate under medium-to-high load, the control threshold can be set to 0.50 for example.

[0087] S3.2 Obtain the measured ultraviolet intensity, combine it with the preset target disinfection intensity reference value, calculate the disinfection effect deviation, perform disinfection intensity judgment, and calculate the power correction amount based on the judgment result to correct the final power setting value of the lamp tube and obtain the corrected power value.

[0088] Specifically, after the lamp is controlled, the ultraviolet irradiance value at the outlet of the ultraviolet reactor is collected by an ultraviolet intensity probe; the reciprocal of the number of all ultraviolet intensity probes is used as the weight, and then the ultraviolet irradiance values ​​of the multi-point distributed ultraviolet intensity probes are weighted and averaged to obtain the measured ultraviolet intensity within the control period.

[0089] Based on the measured ultraviolet intensity, the deviation of the disinfection effect during the control period is determined according to the preset target disinfection intensity reference value;

[0090] Set a disinfection intensity threshold and compare the deviation in disinfection effect with the disinfection intensity threshold;

[0091] If the deviation in disinfection effect is greater than the disinfection intensity threshold, it indicates that the current disinfection intensity is insufficient and the power needs to be increased.

[0092] If the deviation in disinfection effect is less than the disinfection intensity threshold, it indicates that the current disinfection intensity is excessive and the power needs to be reduced to save energy.

[0093] If the disinfection effect deviation is equal to the disinfection intensity threshold, it means that the current disinfection intensity is consistent and the disinfection effect is in an ideal state. The PLC keeps the current operating power of each lamp constant.

[0094] When the disinfection intensity is insufficient or excessive, a proportional-integral adjustment method is used to correct it according to the corresponding disinfection effect deviation, generating a power correction amount. Subsequently, the final power setting value of the lamp is corrected by the power correction amount to obtain the corrected power value, which is then constrained again before being output to each lamp through the ballast (the constraint can be performed by the constraint formula of the final power setting value).

[0095] The measured ultraviolet intensity is expressed as follows:

[0096]

[0097] In the formula, Indicates the first Measured UV intensity for each control cycle Indicates the number of ultraviolet intensity probes. Indicates the first The weight of the ultraviolet irradiance intensity value of each ultraviolet intensity probe Indicates the first The first ultraviolet intensity probe in the... Ultraviolet irradiance intensity values ​​for each control cycle;

[0098] The deviation in disinfection effectiveness is expressed as:

[0099]

[0100] In the formula, Indicates the first The deviation in disinfection effect over a control cycle This represents the absolute value operation. This indicates a reference value for the target disinfection intensity;

[0101] The power correction amount is expressed as:

[0102]

[0103] In the formula, Indicates the first Power correction amount per control cycle This represents the proportional adjustment coefficient. This represents the integral adjustment coefficient. This indicates the period from the first control cycle to the second control cycle. The cumulative deviation over one control cycle. Indicates the first The deviation in disinfection effect during each control cycle;

[0104] The corrected power value is expressed as:

[0105]

[0106] In the formula, Indicates the first Corrected power value for each lamp tube;

[0107] It should be noted that the target disinfection intensity reference value can be set according to the actual disinfection intensity or disinfection intensity standard required; while the disinfection intensity threshold can be set to 0, which is set based on the consistency between the natural equilibrium point in PID control and the engineering control objective; if set to a non-zero parameter, it will lead to unclear control deviation tolerance, unstable disinfection, or risk accumulation.

[0108] Secondly, while the lamp output in an ultraviolet disinfection system responds relatively quickly to power commands, there is a certain lag in hydraulic retention and monitoring feedback; therefore, the proportional gain should not be too high. Furthermore, wastewater quality fluctuates slowly, requiring appropriate integral compensation to eliminate long-term deviations. However, if the integral term is too large, it can easily lead to overcorrection after a short period of large deviation. Therefore, the proportional gain should be adjusted accordingly. The value range is set to 0.08~0.15, and 0.10 is taken as the default value for example, while the integral adjustment coefficient... The value range is set to 0.010 to 0.030, and 0.02 is used as the default value for example; thus, the effect of balancing response speed and stability can be achieved.

[0109] S4. During the correction process, the correction judgment value is calculated, and the quartz sleeve of the lamp tube is determined to be contaminated through the preset judgment threshold in order to maintain the achieved energy-saving effect.

[0110] Specifically, the overall effluent UV intensity value and normalized transmittance are obtained again, and the current transmittance ratio is determined by the preset clean state reference intensity; then, transmittance correction is performed in combination with the normalized transmittance to obtain the correction judgment value.

[0111] Set a judgment threshold, and compare the corrected judgment value with the judgment threshold;

[0112] If the correction value is less than the judgment threshold, it indicates that the quartz sleeve is contaminated; otherwise, it indicates that the quartz sleeve is not contaminated.

[0113] When the quartz sleeve is contaminated, the PLC sends an alarm signal to the host computer, and the host computer then displays a cleaning prompt on the operation interface. At the same time, it triggers an audible and visual alarm and records the alarm time and the corresponding equipment number.

[0114] The light transmittance ratio is expressed as:

[0115]

[0116] In the formula, This indicates a correction to the judgment value. Indicates the reference intensity of the cleanliness status;

[0117] It should be noted that the reference intensity for the clean state needs to be obtained through on-site calibration; for example, when the quartz sleeve is completely clean and the lamp is in a stable operating state (usually reaching thermal stability after running for more than 30 minutes), record the ultraviolet intensity at that moment as a reference value, which should be the average of multiple measurements.

[0118] It should also be noted that the judgment threshold is a boundary value used to determine whether the quartz sleeve is contaminated and whether it needs to be cleaned. Its possible value should reflect the actual impact of contamination while retaining a certain buffer margin.

[0119] For example, in one implementation, to accommodate differences in equipment types, operating conditions, and maintenance strategies among different wastewater treatment plants, the threshold value is exemplarily set between 0.80 and 0.90. If the threshold is below 0.80, although it may still be possible to temporarily maintain effluent disinfection standards by increasing lamp power, it will bring two direct problems: First, the lamps need to operate in a higher load range for extended periods, causing the energy-saving effects obtained through group scheduling and dynamic dimming to be partially offset; second, the system's control margin is eroded. Once adverse factors such as increased flow rate, decreased UVT, or lamp aging are combined, the effluent disinfection intensity is more likely to approach the lower limit, affecting operational stability. Conversely, if the threshold is above 0.90, although... While this can improve the sensitivity of equipment maintenance, it also brings the following problems: First, the ultraviolet intensity probe itself has measurement errors in actual operation of the wastewater treatment plant. Short-term fluctuations in water quality, slight changes in liquid level, and minor changes in output during the thermal stabilization process of the lamp tube can also cause the correction judgment value to fluctuate within a small range. An excessively high threshold will significantly increase the probability of false alarms. Second, maintenance reminders will be too frequent, requiring operators to frequently check and clean the quartz sleeve, which not only increases the workload of operation and maintenance but also reduces the continuity of system operation and may even increase the number of ineffective maintenance behaviors of "reminder-check-confirmation of no obvious pollution". Therefore, to ensure stability and false alarm control capabilities, the default value of the judgment threshold can be set to 0.85 for example.

[0120] This embodiment also provides an energy-saving and consumption-reducing control system for ultraviolet disinfection in wastewater treatment plants, including:

[0121] The data acquisition module is used to acquire the operating parameters of the ultraviolet disinfection equipment during the sewage treatment process, perform preprocessing, and obtain normalized data, including normalized flow rate and normalized transmittance.

[0122] The modeling constraint module is used to obtain the cumulative running time of the lamps, and after determining the aging state of each lamp based on the cumulative running time, it combines normalized data to perform power modeling for the lamps, generates the lamp's operating power setpoint for constraint, and obtains the final power setpoint for continuous control.

[0123] The start-stop correction module is used to determine the lamp operating status based on the control results and control the lamp start-stop. After the lamp control is formed, the deviation of the disinfection effect is obtained and the final power setting value is corrected to ensure that the disinfection standard is met.

[0124] The contamination determination module is used to calculate the correction determination value during the correction process and determine whether the quartz sleeve of the lamp tube is contaminated through a preset determination threshold, so as to maintain the achieved energy-saving effect.

[0125] In summary, this invention introduces a light decay coefficient model based on cumulative operating time to quantitatively characterize the output capacity of each lamp, thereby enabling tiered management of new, medium, and old lamps. This ensures that the lamp's operating status accurately reflects its actual output capacity. Furthermore, by integrating normalized flow rate, ultraviolet transmittance, and light decay coefficient to construct a power calculation model, and combining it with a safety redundancy coefficient for power optimization, the lamp output dynamically matches the actual disinfection requirements, effectively reducing energy consumption while ensuring that the effluent meets standards. Secondly, by quantitatively determining the contamination status of the quartz sleeve and outputting manual cleaning reminders, this invention achieves refined management of equipment maintenance, avoiding hidden energy consumption increases caused by contamination.

[0126] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for energy-saving and consumption-reducing control of ultraviolet disinfection in wastewater treatment plants, characterized in that: include, The operating parameters of the ultraviolet disinfection equipment during the wastewater treatment process are obtained and preprocessed to obtain normalized data, including normalized flow rate and normalized transmittance. After obtaining the cumulative running time of the lamps and determining the aging state of each lamp based on the cumulative running time, power modeling is performed for the lamps using normalized data, generating the lamps' operating power setpoints for constraint, and finally obtaining the final power setpoints for continuous control. Based on the control results, the lamp operating status is determined and the lamp start-stop control is performed. After the lamp control is formed, the deviation of the disinfection effect is obtained and the final power setting value is corrected to ensure that the disinfection standard is met. During the correction process, a correction judgment value is calculated, and a preset judgment threshold is used to determine whether the quartz sleeve of the lamp tube is contaminated, so as to maintain the achieved energy-saving effect.

2. The energy-saving and consumption-reducing control method for ultraviolet disinfection in wastewater treatment plants as described in claim 1, characterized in that: The process of obtaining normalized data by preprocessing the operating parameters of the ultraviolet disinfection equipment during the wastewater treatment process involves installing an electromagnetic flow meter on the inlet pipe before the wastewater enters the ultraviolet disinfection channel, setting an online ultraviolet transmittance detector at the inlet end of the ultraviolet reactor, and setting a multi-point distributed ultraviolet intensity probe at the outlet of the ultraviolet reactor. Flow data of the inlet pipe is collected using an electromagnetic flow meter; The transmittance at the inlet of the ultraviolet reactor was collected using an online ultraviolet transmittance meter. Outlier removal and normalization are performed on all data to obtain normalized data, including normalized flow rate and normalized transmittance.

3. The energy-saving and consumption-reducing control method for ultraviolet disinfection in wastewater treatment plants as described in claim 1, characterized in that: The process of obtaining the cumulative running time of the lamp tubes involves installing ballasts on the lamp tubes and embedding a running timer in the ballasts, and then obtaining the cumulative running time of each lamp tube through the running timer.

4. The energy-saving and consumption-reducing control method for ultraviolet disinfection in wastewater treatment plants as described in claim 1, characterized in that: After determining the aging status of each lamp based on cumulative operating time, power modeling is performed on the lamps using normalized data to generate operating power setpoints for the lamps, as detailed below: Calculate the light decay coefficient of each lamp based on the cumulative operating time; By a preset segmentation threshold and Based on the light decay coefficient, the lamps are classified to obtain the classification results, including old lamps, medium lamps, and new lamps; Based on normalized data, power modeling is performed for each lamp in the partitioning results to generate operating power setpoints.

5. The energy-saving and consumption-reducing control method for ultraviolet disinfection in wastewater treatment plants as described in claim 1, characterized in that: The continuous control of obtaining the final power setpoint involves constraining the operating power setpoint. After the final power setpoint is formed, the PLC repeatedly performs data acquisition, status evaluation, and power calculation according to a set cycle to obtain the final power setpoint, which is then output to the ballast. The ballast adjusts the input current of each lamp to achieve continuous control of the output power of each lamp.

6. The energy-saving and consumption-reducing control method for ultraviolet disinfection in wastewater treatment plants as described in claim 1, characterized in that: The process involves determining the lamp's operating status to control its start / stop. After lamp control is established, the deviation in disinfection effect is assessed, and the final power setting value is corrected accordingly. The specific steps are as follows: Extract the normalized flow rate from the normalized data and compare it with the preset control threshold to generate the lamp control result; The measured ultraviolet intensity is obtained, and combined with the preset target disinfection intensity reference value, the disinfection effect deviation is calculated to perform disinfection intensity judgment. Based on the judgment result, the power correction amount is calculated to correct the final power setting value of the lamp tube, and the corrected power value is obtained.

7. The energy-saving and consumption-reducing control method for ultraviolet disinfection in wastewater treatment plants as described in claim 1, characterized in that: The calculated correction judgment value is obtained again by acquiring the overall effluent UV intensity value and normalized transmittance, and the current transmittance ratio is determined by the preset clean state reference intensity. Subsequently, a transmittance correction is performed based on the normalized transmittance to obtain the correction determination value.

8. The energy-saving and consumption-reducing control method for ultraviolet disinfection in wastewater treatment plants as described in claim 1, characterized in that: The step of determining whether the quartz sleeve of the lamp tube is contaminated by setting a preset judgment threshold involves setting a judgment threshold and comparing the corrected judgment value with the judgment threshold. If the correction value is less than the judgment threshold, it indicates that the quartz sleeve is contaminated; otherwise, it indicates that the quartz sleeve is not contaminated.

9. The energy-saving and consumption-reducing control method for ultraviolet disinfection in wastewater treatment plants as described in claim 8, characterized in that: When the quartz sleeve is contaminated, the PLC sends an alarm signal to the host computer, which then displays a cleaning prompt on the operation interface and triggers an audible and visual alarm, recording the alarm time and the corresponding device number.

10. A wastewater treatment plant ultraviolet disinfection energy-saving and consumption-reducing control system, based on the wastewater treatment plant ultraviolet disinfection energy-saving and consumption-reducing control method according to any one of claims 1 to 9, characterized in that: include, The data acquisition module is used to acquire the operating parameters of the ultraviolet disinfection equipment during the sewage treatment process, perform preprocessing, and obtain normalized data, including normalized flow rate and normalized transmittance. The modeling constraint module is used to obtain the cumulative running time of the lamps, and after determining the aging state of each lamp based on the cumulative running time, it combines normalized data to perform power modeling for the lamps, generates the lamp's operating power setpoint for constraint, and obtains the final power setpoint for continuous control. The start-stop correction module is used to determine the lamp operating status based on the control results and control the lamp start-stop. After the lamp control is formed, the deviation of the disinfection effect is obtained and the final power setting value is corrected to ensure that the disinfection standard is met. The contamination determination module is used to calculate the correction determination value during the correction process and determine whether the quartz sleeve of the lamp tube is contaminated through a preset determination threshold, so as to maintain the achieved energy-saving effect.

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