VOCs gas purification system and method

Abstract

The invention provides a VOCs gas purification system and method, and relates to the technical field of waste gas treatment.The system comprises a pre-filter, a modified zeolite rotating wheel, a UV photolysis oxidation unit, a target sensor, an intelligent controller and a draught fan, the pre-filter is used for filtering out particulate matter larger than 0.3 micrometer in gas to be purified; the modified zeolite rotating wheel is used for adsorbing part of VOCs gas in the filtered gas and heating and desorbing the adsorbed part of VOCs gas into the storage tank; the UV photolysis oxidation unit is used for performing photodegradation treatment on residual VOCs gas in the gas subjected to adsorption treatment to obtain purified tail gas; the target sensor is used for monitoring target concentration data of the VOCs gas, and the intelligent controller intelligently controls the air volume of the fan based on the target concentration data. By implementing the technical scheme provided by the invention, the effects of saving energy and reducing energy consumption are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of waste gas treatment, and in particular to a VOCs gas purification system and method. Background Art

[0002] With the increase of industrial activities, especially the rapid development of the packaging and printing industry, the emission of VOCs (volatile organic compounds) has increased day by day, which has had a serious impact on the atmospheric environment. VOCs not only pose a threat to human health, but also cause environmental problems such as photochemical smog. Therefore, it is particularly important to develop effective VOCs gas purification technology. Among the existing VOCs treatment technologies, commonly used methods include activated carbon adsorption, biodegradation and catalytic combustion. The activated carbon adsorption method uses activated carbon materials with high specific surface area to adsorb VOCs molecules, and when the adsorption is saturated, desorption and regeneration are carried out to achieve recycling; the biodegradation method uses microbial metabolism to degrade VOCs; the catalytic combustion method promotes the combustion of VOCs at a lower temperature through a catalyst to generate CO2 and H2O. These methods have their own characteristics and have alleviated the VOCs pollution problem to a certain extent. However, there are some shortcomings in the existing VOCs treatment technology. For example, although the traditional activated carbon adsorption method is simple to operate, the adsorption efficiency gradually decreases over time, and the desorption process is complicated and the energy consumption is high, which makes it difficult to meet the environmental protection needs of high efficiency and energy saving. The biodegradation method requires a long reaction time and strict environmental condition control, and its scope of application is limited. Although the catalytic combustion method has high purification efficiency, it has large initial investment, high operating costs, and strict requirements on catalysts. Therefore, the existing VOCs treatment technology is difficult to meet the current environmental protection needs of high efficiency and energy saving. Summary of the invention

[0003] In order to solve the above technical problems, the present application provides a VOCs gas purification system and method.

[0004] In the first aspect, the present application provides a VOCs gas purification system, comprising: a pre-filter, a modified zeolite rotor, a UV photolysis and oxidation unit, a target sensor, an intelligent controller and a fan, wherein the pre-filter is used to filter out particulate matter larger than 0.3 microns in the gas to be purified to obtain filtered gas; the modified zeolite rotor is used to adsorb part of the VOCs gas in the filtered gas to obtain adsorbed gas, and the modified zeolite rotor is also used to heat and desorb part of the adsorbed VOCs gas into a storage tank; the UV photolysis and oxidation unit is used to photodegrade the VOCs gas remaining in the adsorbed gas to obtain purified exhaust gas; the intelligent controller is communicatively connected to the target sensor, and the intelligent controller is also electrically connected to the fan, the target sensor is used to monitor the target concentration data of the VOCs gas in the target area, and the intelligent controller is used to obtain the target concentration data and intelligently control the air volume of the fan based on the target concentration data.

[0005] By adopting the above technical scheme, the pre-filter can effectively remove particulate matter larger than 0.3 microns in the gas to be purified, reduce the burden of subsequent processing units, and improve the purification efficiency and service life of the entire system; the modified zeolite rotor further reduces the concentration of VOCs by adsorbing part of the VOCs gas in the gas after filtration treatment, and realizes the recycling of VOCs by heating desorption, thereby improving resource utilization; the UV photolysis oxidation unit further improves the removal rate of VOCs by photodegrading the residual VOCs gas in the gas after adsorption treatment, ensuring that the final exhaust gas emissions meet environmental protection standards. The intelligent controller and the target sensor can be used in conjunction to monitor the VOCs gas concentration in the target area in real time, and intelligently adjust the air volume of the fan according to the actual concentration data to achieve on-demand adjustment. The fan is located at the input end of the modified zeolite rotor and is used to supply air to the modified zeolite rotor. That is, while effectively purifying VOCs gas, this technical scheme achieves the effect of saving energy and reducing energy consumption, thereby improving the economy and stability of system operation.

[0006] Optionally, the diameter of the modified zeolite rotor is 2 meters, the rotation speed of the modified zeolite rotor is set to be less than or equal to a preset rotation speed threshold, and the modified zeolite rotor uses active sites on the surface to adsorb part of the VOCs gas molecules.

[0007] By adopting the above technical solution, the diameter of the modified zeolite rotor is 2 meters, and the rotation speed is set to be less than or equal to the preset rotation speed threshold. The active sites on the surface are used to adsorb some VOCs gas molecules. Due to the use of a specially modified zeolite rotor, its pore size distribution is more uniform and the surface active site density is high. It can achieve high-efficiency VOCs adsorption under low pressure drop, thereby improving the adsorption efficiency and capacity of VOCs, while ensuring the stable operation of the rotor and reducing energy consumption.

[0008] Optionally, the intelligent controller is also used to adjust the frequency of the fan to a first frequency when it is determined that the current concentration value is in a first concentration range, so that the air volume of the fan matches the first concentration range, wherein the target concentration data includes the current concentration value.

[0009] By adopting the above technical solution, it is possible to monitor the concentration changes of VOCs gas in real time, and intelligently adjust the air volume of the fan according to the monitored concentration data, so as to ensure the operating efficiency and purification effect of the system. Specifically, when the VOCs gas concentration in the target area is in the first concentration range, the intelligent controller will automatically adjust the frequency of the fan to the first frequency, so that the air volume of the fan matches the concentration range, avoiding the problem of low purification efficiency or energy waste caused by excessive or insufficient air volume, and improving the energy efficiency and economy of the system.

[0010] Optionally, the intelligent controller is also used to trigger an early warning mechanism when it is determined that the current concentration value is greater than a preset concentration threshold.

[0011] By adopting the above technical solution, when the VOCs gas concentration in the target area exceeds the preset concentration threshold, the intelligent controller can detect this abnormal situation in time and immediately trigger the early warning mechanism. This can quickly remind the operator to take corresponding measures to avoid safety accidents or environmental pollution caused by excessive VOCs gas concentration. This early warning mechanism improves the safety and reliability of the system and ensures that the VOCs gas purification process is always in a controllable state.

[0012] Optionally, the system further comprises a waste heat recovery device, which is used to recover the heat of the purified exhaust gas to heat the fresh air at the air inlet of the fan.

[0013] By adopting the above technical solution, the heat in the purified exhaust gas can be effectively recovered and used to heat the fresh air at the fan inlet, thereby reducing the energy consumption of the system and improving energy utilization. Specifically, the waste heat recovery device can significantly reduce the energy required for fresh air heating, thereby reducing the overall operating cost, and also helps to improve the environmental performance of the system.

[0014] Optionally, the UV photolysis and oxidation unit includes multiple groups of high-intensity ultraviolet lamps, which are used to irradiate the gas after adsorption treatment with ultraviolet light to accelerate the oxidation reaction rate of residual VOCs gas, wherein the power of each group of high-intensity ultraviolet lamps is greater than or equal to 200W, and each group of high-intensity ultraviolet lamps is used to emit 185nm and 254nm ultraviolet rays.

[0015] By adopting the above technical solution, using multiple sets of high-intensity ultraviolet lamps to irradiate the gas after adsorption treatment with ultraviolet light, the oxidation reaction rate of residual VOCs gas can be significantly accelerated and the purification efficiency can be improved. The power of each set of high-intensity ultraviolet lamps is greater than or equal to 200W, ensuring sufficient energy density and further improving the effect of photolysis and oxidation. The combination of 185nm and 254nm ultraviolet wavelengths can effectively crack VOCs molecules and quickly convert them into harmless substances, thereby achieving a more thorough purification purpose.

[0016] Optionally, the above system also includes a remote monitoring platform, and the intelligent controller is also used to upload the target data set to the remote monitoring platform and store it, wherein the target data set includes target concentration data and corresponding fan frequency data, and the target concentration data includes the concentration value at the current moment and the concentration value within a preset time period before the current moment; wherein the remote monitoring platform is integrated with a fault prediction model, and the fault prediction model is obtained by training historical data using an LSTM model; the remote monitoring platform is also used to predict the target data set according to the fault prediction model to obtain a prediction result, wherein the prediction result is used to represent the changing trend of the concentration data of the VOCs gas.

[0017] By adopting the above technical solutions, the purification process of VOCs gas can be monitored in real time and intelligently controlled. Specifically, the VOCs gas concentration data in the target area is monitored by the target sensor, and the data is transmitted to the intelligent controller, ensuring the real-time and accuracy of the system. The intelligent controller dynamically adjusts the air volume of the fan based on the target concentration data, improving the purification efficiency and energy utilization rate. In particular, in different concentration ranges, the intelligent controller can automatically select the appropriate fan frequency to make the system run more efficient and economical. The system introduces a remote monitoring platform, which can upload and store the target data set to facilitate subsequent data analysis and management; the target data set includes not only the concentration value at the current moment, but also the historical concentration value and the corresponding fan frequency data within the preset time, providing rich data support for system optimization. The remote monitoring platform integrates the fault prediction function based on the LSTM model. Through the training of historical data, it can accurately predict the changing trend of VOCs gas concentration; this prediction capability helps to take measures in advance to avoid potential environmental pollution risks and improve the reliability and safety of the system.

[0018] In the second aspect of the present application, a VOCs gas purification method is also provided, which is applied to any of the aforementioned systems, comprising: filtering the gas to be purified through a pre-filter to obtain filtered gas; acquiring target concentration data of the VOCs gas in the target area through a target sensor; using an intelligent controller to intelligently control the air volume of the fan based on the target concentration data, wherein the fan is located at the input end of the modified zeolite rotor, and is used to supply air into the modified zeolite rotor; adsorbing the filtered gas through the modified zeolite rotor to adsorb part of the VOCs gas to obtain adsorbed gas, and desorbing part of the adsorbed VOCs gas into a storage tank after heating; photodegrading the VOCs gas remaining in the adsorbed gas through a UV photolysis and oxidation unit to obtain purified exhaust gas.

[0019] By adopting the above technical scheme, the pre-filter can effectively remove particles larger than 0.3 microns in the gas to be purified, ensure the normal operation of subsequent processing equipment, extend the service life of the equipment, and reduce maintenance costs; the modified zeolite wheel can achieve efficient VOCs capture by adsorbing part of the VOCs in the gas, and at the same time transfer the adsorbed VOCs gas to the storage tank by heating desorption, which is convenient for centralized treatment, improves the efficiency of adsorption and desorption, and reduces energy consumption; the UV photolysis oxidation unit further removes the residual VOCs by photodegrading the gas after adsorption treatment, so that the final exhaust gas meets the environmental protection standards, ensuring the thoroughness and reliability of the purification effect; the coordinated use of the intelligent controller and the target sensor can adjust the air volume of the fan in real time according to the VOCs concentration in the target area, realize precise control, improve the response speed and processing capacity of the system, and reduce energy consumption. That is, this technical scheme can achieve the effect of saving energy and reducing energy consumption while effectively purifying VOCs gas, and improve the economy and stability of system operation.

[0020] Optionally, an intelligent controller is used to intelligently control the air volume of the fan based on the target concentration data, including: pre-establishing a matching relationship table between the concentration range of VOCs gas and the fan frequency; when it is determined that the current concentration value is in the first concentration range, the intelligent controller determines the first frequency corresponding to the first concentration range based on the matching relationship table, wherein the target concentration data includes the current concentration value, and the matching relationship table includes the corresponding relationship between the first concentration range and the first frequency; the frequency of the fan is adjusted to the first frequency so that the air volume of the fan matches the first concentration range.

[0021] By adopting the above technical solution, a matching relationship table between the concentration range of VOCs gas and the fan frequency is established in advance to ensure that within different concentration ranges, the fan can quickly adjust to the appropriate frequency to adapt to the current VOCs concentration changes. This intelligent control method can not only effectively improve the purification efficiency, but also reduce unnecessary energy consumption and reduce operating costs. At the same time, by accurately controlling the fan air volume, equipment wear and noise problems caused by excessive air volume can be avoided, extending the service life of the equipment.

[0022] Optionally, after obtaining the purified exhaust gas, the method further includes: recovering the heat of the purified exhaust gas through a waste heat recovery device, wherein the system also includes a waste heat recovery device; and using the heat of the purified exhaust gas to heat the fresh air at the air inlet of the fan.

[0023] By adopting the above technical solution, the heat in the purified exhaust gas can be effectively recovered and used to heat the fresh air at the fan inlet, thereby reducing the energy consumption of the system, improving energy utilization, and reducing operating costs. At the same time, the solution can further optimize the energy efficiency of the entire purification system and improve the overall environmental performance. Specifically, the introduction of the waste heat recovery device enables the system to fully utilize the heat in the high-temperature exhaust gas while processing VOCs, avoiding energy waste and achieving the goal of energy conservation and emission reduction.

[0024] In a third aspect of the present application, an electronic device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the program, any of the above method steps is implemented.

[0025] In a fourth aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores instructions, and when the instructions are executed, any of the above method steps is performed.

[0026] In summary, one or more technical solutions provided in this application have at least the following technical effects or advantages: 1. While effectively purifying VOCs gas, it can save energy and reduce energy consumption, thus improving the economy and stability of system operation; 2. Match the air volume of the fan with the VOCs gas concentration range, avoiding the problem of low purification efficiency or energy waste caused by excessive or insufficient air volume, and improving the energy efficiency and economy of the system; 3. The waste heat recovery device can effectively recover the heat in the purified exhaust gas and use it to heat the fresh air at the fan inlet, thereby reducing the energy consumption of the system and improving energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1This is the framework of a VOCs gas purification system provided in the embodiment of the present application Figure 1 ; Figure 2 This is the framework of a VOCs gas purification system provided in the embodiment of the present application Figure 2 ; Figure 3 This is a flow chart of a VOCs gas purification method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to enable technicians in this field to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments.

[0029] In the description of the embodiments of the present application, words such as "for example" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "for example" or "for example" is intended to present related concepts in a specific way.

[0030] In the description of the embodiments of the present application, the term "plurality" means two or more. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. The terms "include", "comprise", "have" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

[0031] The following is combined with Figure 1-Figure 3 The embodiments of the present application are described.

[0032] The present application provides a VOCs gas purification system, referring to Figure 1 , Figure 1 This is the framework of a VOCs gas purification system provided in the embodiment of the present application Figure 1 The system includes: a pre-filter, a modified zeolite rotor, a UV photolysis oxidation unit, a target sensor, an intelligent controller and a fan, wherein: The pre-filter is used to filter out particles larger than 0.3 microns in the gas to be purified to obtain filtered gas; The modified zeolite rotor is used to adsorb part of the VOCs gas in the filtered gas to obtain the adsorbed gas. The modified zeolite rotor is also used to heat up and desorb part of the adsorbed VOCs gas into a storage tank. The UV photolysis and oxidation unit is used to photodegrade the residual VOCs gas in the gas after adsorption treatment to obtain purified tail gas; The intelligent controller is communicatively connected with the target sensor, and is also electrically connected with the fan. The target sensor is used to monitor the target concentration data of VOCs gas in the target area, and the intelligent controller is used to obtain the target concentration data and intelligently control the air volume of the fan based on the target concentration data.

[0033] In the above embodiment, the pre-filter can effectively remove particulate matter larger than 0.3 microns in the gas to be purified, reduce the burden of the subsequent processing unit, and improve the purification efficiency and service life of the entire system; the modified zeolite rotor further reduces the concentration of VOCs by adsorbing part of the VOCs gas in the gas after filtration treatment, and realizes the recycling of VOCs by heating desorption, thereby improving resource utilization; the UV photolysis oxidation unit further improves the removal rate of VOCs by photodegrading the residual VOCs gas in the gas after adsorption treatment, ensuring that the final exhaust gas meets environmental protection standards. The intelligent controller and the target sensor are used in conjunction to monitor the VOCs gas concentration in the target area in real time. For example, the target area can be a printing workshop, or the exhaust port of the equipment that generates VOCs gas, or the entrance of the modified zeolite rotor after passing through the pre-filter, and the air volume of the fan is intelligently adjusted according to the actual concentration data to achieve on-demand regulation. That is, this embodiment achieves the effect of saving energy and reducing energy consumption while effectively purifying VOCs gas, thereby improving the economy and stability of system operation.

[0034] Compared with traditional activated carbon, zeolite has higher thermal stability and chemical stability, and is more suitable for desorption processes at high temperatures. In addition, the zeolite rotor design can work continuously, which improves the processing efficiency. The adsorbed VOCs are heated and desorbed into the storage tank. This process helps to recover the VOCs gas and further reduce environmental pollution. The UV photolysis and oxidation unit can provide further purification. This method can effectively destroy the remaining VOCs molecular structure and convert them into harmless substances such as water and carbon dioxide. This combined method improves the overall purification efficiency. This embodiment significantly improves the removal rate of VOCs through multi-stage treatment of pre-filtration, zeolite rotor adsorption and UV photolysis and oxidation; through intelligent control, the system can adjust the air volume according to actual needs, achieve energy saving and consumption reduction, reduce unnecessary energy consumption, and realize resource reuse by recovering VOCs; the continuously working zeolite rotor and intelligent control strategy ensure the long-term stable operation of the system; the system is not only suitable for the packaging and printing industry, but also can be extended to other industrial fields that produce VOCs, such as chemical industry, pharmaceutical industry, etc.

[0035] In an optional embodiment, the diameter of the modified zeolite rotor is 2 meters, the rotation speed of the modified zeolite rotor is set to be less than or equal to a preset rotation speed threshold, and the modified zeolite rotor uses active sites on the surface to adsorb some VOCs gas molecules.

[0036] In the above embodiment, the diameter of the modified zeolite rotor is 2 meters, and the rotation speed is set to be less than or equal to the preset rotation speed threshold. The active sites on the surface are used to adsorb some VOCs gas molecules. Due to the use of a specially modified zeolite rotor, its pore size distribution is more uniform, and the surface active site density is high. It can achieve high-efficiency VOCs adsorption under low pressure drop conditions, thereby improving the adsorption efficiency and capacity of VOCs, while ensuring the stable operation of the rotor and reducing energy consumption. Zeolite materials have rich pore structures and high specific surface areas, and the active sites on the surface can effectively adsorb VOCs molecules. The modified zeolite further enhances the adsorption performance, making it more suitable for the adsorption treatment of VOCs. Optionally, the diameter of the zeolite rotor is set to 2m, and the rotation speed is controlled at 5 revolutions per minute (or other speeds) to ensure sufficient contact time and adsorption efficiency. The modified zeolite rotor has a high adsorption capacity and good thermal stability, and still maintains stable adsorption performance under high temperature conditions, effectively solving the efficiency attenuation problem of the traditional activated carbon adsorption method.

[0037] This embodiment utilizes the high specific surface area and abundant active sites of the modified zeolite rotor to significantly improve the adsorption efficiency, and can complete efficient VOCs adsorption in a shorter time; by setting a preset speed threshold, it is ensured that the rotor runs at the optimal speed, which can not only ensure the adsorption effect, but also improve the processing capacity and achieve efficient and stable operation; the material properties of the modified zeolite rotor give it better durability and regeneration ability, extending the service life of the equipment and reducing maintenance costs; the system is suitable for VOCs gases of different concentrations and types, has strong adaptability and flexibility, and can be used in a variety of industrial environments.

[0038] In an optional embodiment, the intelligent controller is also used to adjust the frequency of the fan to a first frequency when it is determined that the current concentration value is in a first concentration range, so that the air volume of the fan matches the first concentration range, wherein the target concentration data includes the current concentration value.

[0039] In the above embodiment, it is possible to monitor the concentration change of VOCs gas in real time, and intelligently adjust the air volume of the fan according to the monitored concentration data, so as to ensure the operating efficiency and purification effect of the system. Specifically, when the VOCs gas concentration in the target area is in the first concentration range, the intelligent controller will automatically adjust the frequency of the fan to the first frequency, so that the air volume of the fan matches the concentration range, avoiding the problem of low purification efficiency or energy waste caused by excessive or insufficient air volume, and improving the energy efficiency and economy of the system.

[0040] This embodiment dynamically adjusts the fan frequency according to the VOCs concentration through the intelligent controller, which can ensure that the air volume matches the VOCs concentration, thereby avoiding the reduction of purification efficiency caused by excessive or insufficient air volume; dynamic adjustment of the fan frequency can optimize energy consumption and avoid unnecessary energy waste. For example, when the VOCs concentration is low, reducing the fan frequency can reduce energy consumption; when the VOCs concentration is high, increasing the fan frequency can ensure sufficient purification capacity. Dynamic adjustment of the fan frequency can optimize energy consumption according to actual needs and reduce operating costs; the application of the intelligent controller improves the intelligence level of the entire system, enabling it to respond more flexibly to various working conditions and changes in VOCs concentration.

[0041] In an optional embodiment, the intelligent controller is further configured to trigger an early warning mechanism when it is determined that the current concentration value is greater than a preset concentration threshold.

[0042] In the above embodiment, when the VOCs gas concentration in the target area exceeds the preset concentration threshold, the intelligent controller can detect this abnormal situation in time and immediately trigger the early warning mechanism. This can quickly remind the operator to take corresponding measures to avoid safety accidents or environmental pollution caused by excessive VOCs gas concentration. This early warning mechanism improves the safety and reliability of the system and ensures that the purification process of VOCs gas is always in a controllable state.

[0043] In the related art, after the abnormal situation is discovered, manual inspection and processing are required, and the reaction speed is slow, which may lead to increased environmental pollution; the purification system in the related art relies on the experience and judgment of the operator, which increases the burden on the operator and is prone to negligence and errors. This embodiment can promptly trigger the early warning mechanism to take countermeasures when the VOCs concentration exceeds the standard, or issue an alarm in time before the VOCs concentration reaches a dangerous level to avoid potential environmental pollution and safety accidents; according to the early warning information, the operation and maintenance strategy can be adjusted in time, such as increasing the operating time of the purification equipment, adjusting the operating parameters, etc., to ensure that the system operates stably and meets environmental protection requirements.

[0044] In an optional embodiment, the system further includes a waste heat recovery device, which is used to recover the heat of the purified exhaust gas to heat the fresh air at the air inlet of the fan.

[0045] In the above embodiment, if Figure 2 As shown, the above-mentioned VOCs gas purification system also includes a waste heat recovery device, which can effectively recover the heat in the purified exhaust gas and use it to heat the fresh air at the air inlet of the fan, thereby reducing the energy consumption of the system and improving energy utilization. Specifically, the waste heat recovery device can significantly reduce the energy required for fresh air heating, thereby reducing the overall operating cost, and also helps to improve the environmental performance of the system.

[0046] In traditional VOCs purification systems, the purified high-temperature tail gas is directly discharged, resulting in a large amount of energy waste. In some process links, the air entering the system needs to be preheated. If external energy is used for heating, the operating cost will increase. This embodiment uses a waste heat recovery device to effectively recover the heat of the purified tail gas and convert it into usable thermal energy, thus realizing energy reuse. By recovering and utilizing the heat of the tail gas, the energy efficiency of the entire system has been significantly improved; it is in line with the concept of sustainable development and can contribute to environmental protection by reducing energy consumption and greenhouse gas emissions.

[0047] In an optional embodiment, the UV photolysis and oxidation unit includes multiple groups of high-intensity ultraviolet lamps, which are used to irradiate the gas after adsorption treatment with ultraviolet light to accelerate the oxidation reaction rate of residual VOCs gas, wherein the power of each group of high-intensity ultraviolet lamps is greater than or equal to 200W, and each group of high-intensity ultraviolet lamps is used to emit 185nm and 254nm ultraviolet rays.

[0048] In the above embodiment, using multiple sets of high-intensity ultraviolet lamps to irradiate the gas after adsorption treatment with ultraviolet light can significantly accelerate the oxidation reaction rate of the residual VOCs gas and improve the purification efficiency. The power of each set of high-intensity ultraviolet lamps is greater than or equal to 200W, ensuring sufficient energy density and further improving the effect of photolysis and oxidation. The combination of ultraviolet wavelengths of 185nm and 254nm can effectively crack VOCs molecules and quickly convert them into harmless substances, thereby achieving a more thorough purification purpose.

[0049] By adopting high-intensity ultraviolet lamps and optimizing their power and wavelength, the oxidation reaction rate of VOCs gas can be significantly increased, thereby improving the treatment efficiency; dual-wavelength ultraviolet rays of 185nm and 254nm can more comprehensively treat various types of VOCs, ensuring that residual VOCs gas is effectively purified; high-power ultraviolet lamps can complete efficient photolysis and oxidation in a shorter time, shorten the treatment time, and improve the system's processing capacity; the optimized UV photolysis and oxidation unit can more effectively decompose residual VOCs gas, reduce emission concentration, and meet more stringent environmental protection requirements; the use of high-quality high-intensity ultraviolet lamps and the optimization of their parameters can improve the stability and reliability of the equipment and extend its service life.

[0050] In an optional embodiment, the above system also includes a remote monitoring platform, and the intelligent controller is also used to upload the target data set to the remote monitoring platform and store it, wherein the target data set includes target concentration data and corresponding frequency data of the fan, and the target concentration data includes the concentration value at the current moment and the concentration value within a preset time period before the current moment; wherein the remote monitoring platform is integrated with a fault prediction model, and the fault prediction model is obtained by training historical data using an LSTM model; the remote monitoring platform is also used to predict the target data set according to the fault prediction model to obtain a prediction result, wherein the prediction result is used to represent the changing trend of the concentration data of the VOCs gas.

[0051] In the above embodiments, the purification process of VOCs gas can be monitored and controlled in real time and intelligently. Specifically, the VOCs gas concentration data in the target area is monitored by the target sensor, and the data is transmitted to the intelligent controller, which ensures the real-time and accuracy of the system. The intelligent controller dynamically adjusts the air volume of the fan based on the target concentration data, improves the purification efficiency and energy utilization rate, especially in different concentration ranges, the intelligent controller can automatically select the appropriate fan frequency, making the system operation more efficient and economical. The system introduces a remote monitoring platform, which can upload and store the target data set to facilitate subsequent data analysis and management; the target data set includes not only the concentration value at the current moment, but also the historical concentration value and the corresponding fan frequency data within the preset time. The target data set can also include wind speed, heating desorption temperature, UV lamp power, etc., which provides rich data support for system optimization. The remote monitoring platform integrates a fault prediction function based on the LSTM model. Through the training of historical data, it can accurately predict the changing trend of VOCs gas concentration; this prediction capability helps to take measures in advance to avoid potential environmental pollution risks and improve the reliability and safety of the system.

[0052] By using the LSTM model to train historical data, the remote monitoring platform can more accurately predict the trend of changes in VOCs gas concentration, so as to take corresponding measures in advance to deal with potential environmental problems; the remote monitoring platform can monitor the operating status of the system in real time, and detect potential faults or anomalies in advance through the prediction model, thereby enhancing the reliability and stability of the system; according to the prediction results of the remote monitoring platform, the operation and maintenance personnel can more accurately formulate operation and maintenance strategies, such as adjusting the fan frequency, replacing adsorption materials, etc., to ensure the continuous and stable operation of the system. Through accurate prediction and operation and maintenance strategy formulation, the system can reduce unnecessary downtime and maintenance costs and improve overall operational efficiency. This embodiment uses the LSTM model for fault prediction, which can detect potential problems in advance, take preventive measures, and reduce the risk of faults; centralized management and analysis of historical data can optimize operation and maintenance management and improve the operating efficiency and reliability of the system. For example, the target data set includes concentration data at the current moment and within the previous 24 hours. Assuming that the concentration value at the current moment is 50mg / m³, the concentration data within the previous 24 hours shows a gradual upward trend, from 40mg / m³ to 50mg / m³, and the fan rate data is stable at 80Hz. After analyzing the target data set, the fault prediction model based on the LSTM model predicts that the concentration of VOCs gas will continue to rise in the next few hours and may reach 60mg / m³ or higher; this prediction result prompts operation and maintenance personnel to pay close attention to the system status and may need to adjust the fan frequency or take other measures to reduce VOCs emissions.

[0053] For example, the target data set includes the concentration data at the current moment and in the previous week. Assuming that the concentration value at the current moment is 30 mg / m³, the concentration data in the previous week showed periodic fluctuations, gradually increasing from Monday to Friday and decreasing on weekends. The fan frequency data is automatically adjusted according to the concentration change, but the adjustment is not large. After the LSTM model is trained on the historical data set, it is found that the concentration of VOCs gas has a periodic fluctuation pattern. Based on this pattern, the model predicts that the concentration of VOCs gas will fluctuate in the same periodic manner in the next few days, that is, gradually increasing from Monday to Friday and decreasing on weekends; in this way, the operation and maintenance personnel can adjust the operation and maintenance strategy in advance based on this prediction result, such as reducing the fan frequency on weekends to save energy, or strengthening monitoring and emission control on weekdays.

[0054] The present application also provides a VOCs gas purification method, which is applied to the system of any of the above embodiments, such as Figure 3 As shown, Figure 3 This is a flow chart of a VOCs gas purification method provided in an embodiment of the present application, comprising: Step S301, filtering the gas to be purified through a pre-filter to obtain filtered gas; Step S302, obtaining target concentration data of VOCs gas in a target area through a target sensor; Step S303, using an intelligent controller to intelligently control the air volume of the fan based on the target concentration data, wherein the fan is located at the input end of the modified zeolite rotor and is used to supply air into the modified zeolite rotor; Step S304, performing adsorption treatment on the filtered gas by a modified zeolite wheel to adsorb part of the VOCs gas to obtain adsorbed gas, and the adsorbed part of the VOCs gas is desorbed into a storage tank by heating; Step S305, photodegrading the VOCs gas remaining in the gas after the adsorption treatment by a UV photolysis oxidation unit to obtain purified tail gas.

[0055] Through the above steps, the pre-filter can effectively remove particulate matter larger than 0.3 microns in the gas to be purified, ensure the normal operation of the subsequent processing equipment, extend the service life of the equipment, and reduce maintenance costs; the modified zeolite wheel can achieve efficient VOCs capture by adsorbing part of the VOCs in the gas, and at the same time transfer the adsorbed VOCs gas to the storage tank by heating and desorption, which is convenient for centralized treatment, improves the efficiency of adsorption and desorption, and reduces energy consumption; the UV photolysis oxidation unit further removes the residual VOCs by photodegrading the gas after adsorption treatment, so that the exhaust gas finally discharged meets the environmental protection standards, ensuring the thoroughness and reliability of the purification effect; the coordinated use of the intelligent controller and the target sensor can adjust the air volume of the fan in real time according to the VOCs concentration in the target area, realize precise control, improve the response speed and processing capacity of the system, and reduce energy consumption. That is, the method of this embodiment achieves the effect of saving energy and reducing energy consumption while effectively purifying the VOCs gas, and improves the economy and stability of the system operation.

[0056] This embodiment uses a pre-filter, a modified zeolite rotor and a UV photolysis oxidation unit in combination to more effectively remove VOCs gas and improve purification efficiency; by intelligently controlling the air volume of the fan, the air supply volume can be adjusted in real time according to the concentration of the VOCs gas, thereby ensuring that the modified zeolite rotor always works in the best state and improving purification efficiency; intelligent control can prevent the fan from over-supplying air when the VOCs gas concentration is low, thereby saving energy and avoiding unnecessary energy waste, thereby improving the energy utilization efficiency of the entire system.

[0057] In an optional embodiment, an intelligent controller is used to intelligently control the air volume of the fan based on target concentration data, including: pre-establishing a matching relationship table between the concentration range of VOCs gas and the fan frequency; when it is determined that the current concentration value is in the first concentration range, the intelligent controller determines the first frequency corresponding to the first concentration range based on the matching relationship table, wherein the target concentration data includes the current concentration value, and the matching relationship table includes the corresponding relationship between the first concentration range and the first frequency; the frequency of the fan is adjusted to the first frequency so that the air volume of the fan matches the first concentration range.

[0058] In the above embodiment, a matching relationship table between the concentration range of VOCs gas and the fan frequency is pre-established to ensure that within different concentration ranges, the fan can be quickly adjusted to a suitable frequency to adapt to the current VOCs concentration changes. This intelligent control method can not only effectively improve the purification efficiency, but also reduce unnecessary energy consumption and reduce operating costs. At the same time, by accurately controlling the fan air volume, equipment wear and noise problems caused by excessive air volume can be avoided, extending the service life of the equipment.

[0059] By pre-establishing a matching relationship table, this embodiment can more accurately adjust the frequency of the fan according to the concentration data of the VOCs gas, thereby improving the control accuracy; since the control strategy is based on real-time concentration data, the system can respond more quickly to changes in the VOCs gas concentration, thereby adjusting the fan frequency more quickly; since the fan frequency and VOCs gas concentration can be matched more accurately, unnecessary energy waste can be avoided and energy can be saved.

[0060] In an optional embodiment, after obtaining the purified exhaust gas, the above method also includes: recovering the heat of the purified exhaust gas through a waste heat recovery device, wherein the system also includes a waste heat recovery device; using the heat of the purified exhaust gas to heat the fresh air at the air inlet of the fan.

[0061] In the above embodiment, the heat in the purified exhaust gas can be effectively recovered and used to heat the fresh air at the fan inlet, thereby reducing the energy consumption of the system, improving energy utilization, and reducing operating costs. At the same time, the solution can further optimize the energy efficiency of the entire purification system and improve the overall environmental performance. Specifically, the introduction of the waste heat recovery device enables the system to fully utilize the heat in the high-temperature exhaust gas while processing VOCs, avoiding energy waste and achieving the goal of energy conservation and emission reduction.

[0062] In traditional VOCs purification systems, the purified high-temperature tail gas is directly discharged, resulting in a large amount of energy waste. In some process links, the air entering the system needs to be preheated. If external energy is used for heating, the operating cost will increase. This embodiment uses a waste heat recovery device to effectively recover the heat of the purified tail gas and convert it into usable thermal energy, thus realizing energy reuse. By recovering and utilizing the heat of the tail gas, the energy efficiency of the entire system has been significantly improved; waste heat recovery not only reduces energy waste, but also helps reduce carbon emissions, which meets the requirements of environmental protection and sustainable development. Through waste heat recovery, the temperature of the fresh air can be better controlled, and the stability and reliability of the system can be improved.

[0063] Obviously, the above-described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application will be described in detail below in conjunction with specific embodiments.

[0064] In order to solve the problem of low purification efficiency of the VOCs gas purification system, the embodiment of the present application provides a VOCs gas purification method and system for a printing workshop.

[0065] The solution of the embodiment of the present application is as follows: In view of the VOCs characteristics of the packaging and printing workshop, a multi-stage series purification unit was designed. The first stage uses a pre-filter to remove particulate matter, the second stage uses a modified zeolite wheel to adsorb VOCs, and the third stage is equipped with a UV photolysis and oxidation unit to enhance the degradation of residual VOCs.

[0066] The modified zeolite wheel has a high adsorption capacity and good thermal stability, and maintains stable adsorption performance under high temperature conditions, effectively solving the efficiency attenuation problem of traditional activated carbon adsorption method. The UV photolysis and oxidation unit uses high-energy ultraviolet light to accelerate the oxidation reaction rate of incompletely adsorbed VOCs molecules and convert them into harmless substances.

[0067] In the packaging and printing workshop, considering the wide variety of VOCs emitted by printing inks, the embodiment of the present application first sets up an efficient pre-filter to filter out atmospheric particulate matter larger than 0.3 microns to prevent it from clogging the subsequent adsorption layer. Subsequently, a specially modified zeolite wheel is used, which has a more uniform pore size distribution and a high density of surface active sites, and can achieve efficient VOCs adsorption under low pressure drop. The diameter of the zeolite wheel is set to 2m, and the speed is controlled at about 5 revolutions per minute to ensure sufficient contact time and adsorption efficiency. The gas passing through the zeolite wheel further enters the UV photolysis oxidation zone, where multiple groups of high-intensity ultraviolet lamps are installed with a power of 200W and a wavelength concentrated in the dual bands of 185nm and 254nm to destroy the bonding of VOCs molecules. The final products are water and carbon dioxide, achieving the purpose of thorough purification.

[0068] Furthermore, in order to improve the energy efficiency of the purification system, the embodiment of the present application introduces an intelligent air volume adjustment mechanism. This mechanism monitors the changes in VOCs concentration in real time and automatically adjusts the fan frequency to dynamically match the air volume demand and reduce unnecessary energy consumption. In addition, the system is equipped with a waste heat recovery module to recycle the heat of the purified exhaust gas and use it to heat the fresh air at the air inlet, achieving the goal of energy saving and emission reduction.

[0069] The core of the intelligent air volume adjustment mechanism lies in accurate data collection and fast-response control systems. By arranging an online detection sensor array, the concentration trend of VOCs gas in the workshop is monitored in real time. Once the concentration value deviates from the preset safety threshold range, the control system immediately starts the early warning program, synchronously adjusts the working state of the fan inverter, and accurately controls the intake air flow, thereby maintaining the optimal state of the purification system. The waste heat recovery module integrates advanced heat exchange technology, using a heat exchanger to transfer the heat of the exhausted high-temperature gas to fresh air, significantly reducing the preheating cost and improving the heat utilization efficiency of the entire system.

[0070] In addition, a remote monitoring and maintenance platform function has been added, which connects to on-site equipment through a wireless network to support real-time data transmission and fault diagnosis. Administrators can remotely view the operating status of the purification system through mobile terminals, receive alarm notifications, and take timely response measures, greatly improving the reliability and maintenance efficiency of the system.

[0071] The design of the remote monitoring platform fully considers user experience and information security, and adopts cloud computing architecture to ensure secure data transmission and efficient processing. The system has built-in advanced encryption standard AES protocol to ensure data privacy during remote communication. The interface is friendly and intuitive, and supports graphical display of the change curve of key parameters, which allows users to understand the working status of the system at a glance. At the same time, the integrated fault prediction algorithm is based on historical data analysis, which can identify potential signs of equipment failure in advance, actively remind the maintenance team to perform preventive maintenance, and avoid emergencies affecting normal production operations.

[0072] The embodiments of the present application have at least the following beneficial effects: 1) Due to the use of a specially modified zeolite wheel and UV photolysis oxidation unit, the VOCs purification rate is greatly improved to more than 99%, far exceeding the effect of conventional activated carbon adsorption method.

[0073] 2) It is also equipped with intelligent temperature control and air volume adjustment mechanisms, which reduces average energy consumption by about 30%, significantly reducing operating costs and carbon footprint.

[0074] 3) In addition, after the introduction of the remote monitoring system, the maintenance cycle was extended by 50% and the downtime was reduced by 70%, greatly improving the system's availability and maintenance efficiency.

[0075] In summary, the embodiments of the present application not only perform outstandingly in purification efficiency, but also take into account both economic benefits and social responsibilities, and provide a practical solution for VOCs pollution control.

[0076] The present application also provides a computer-readable storage medium, in which instructions are stored. When the instructions are executed, any one of the method steps described above is executed.

[0077] In an exemplary embodiment, the computer-readable storage medium may include, but is not limited to, various media that can store computer programs, such as a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk.

[0078] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0079] In the several embodiments provided in this application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some service interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

[0080] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0081] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0082] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a memory and includes several instructions for a computer device (which can be a personal computer, server or network device, etc.) to execute all or part of the steps of the various embodiments of the present application. The aforementioned memory includes: various media that can store program codes, such as USB flash drives, mobile hard drives, magnetic disks or optical disks.

[0083] The above is only an exemplary embodiment of the present disclosure and cannot be used to limit the scope of the present disclosure. That is, any equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. After considering the disclosure of the specification and practice, those skilled in the art will easily think of other embodiments of the present disclosure.

[0084] This application is intended to cover any modifications, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary technical means in the technical field not recorded in the present disclosure.

Claims

1. A VOCs gas purification system, characterized in that: include: Pre-filter, modified zeolite rotor, UV photolysis oxidation unit, target sensor, intelligent controller and fan, among which, The pre-filter is used to filter out particles larger than 0.3 microns in the gas to be purified to obtain filtered gas; The modified zeolite rotor is used to adsorb part of the VOCs gas in the filtered gas to obtain adsorbed gas, and the modified zeolite rotor is also used to heat and desorb the adsorbed part of the VOCs gas into a storage tank; The UV photolysis and oxidation unit is used to photodegrade the VOCs gas remaining in the gas after the adsorption treatment to obtain purified tail gas; The intelligent controller is communicatively connected to the target sensor, and is also electrically connected to the fan. The target sensor is used to monitor the target concentration data of VOCs gas in the target area, and the intelligent controller is used to obtain the target concentration data and intelligently control the air volume of the fan based on the target concentration data.

2. The system according to claim 1, characterized in that The diameter of the modified zeolite rotor is 2 meters, the rotation speed of the modified zeolite rotor is set to be less than or equal to a preset rotation speed threshold, and the modified zeolite rotor uses active sites on the surface to adsorb part of the VOCs gas molecules.

3. The system according to claim 1, characterized in that The intelligent controller is also used to adjust the frequency of the fan to a first frequency when it is determined that the current concentration value is in a first concentration interval, so that the air volume of the fan matches the first concentration interval, wherein the target concentration data includes the current concentration value.

4. The system according to claim 3, characterized in that The intelligent controller is also used to trigger an early warning mechanism when it is determined that the current concentration value is greater than a preset concentration threshold.

5. The system according to claim 1, characterized in that The system also includes a waste heat recovery device, which is used to recover the heat of the purified exhaust gas to heat the fresh air at the air inlet of the fan.

6. The system according to claim 1, characterized in that The UV photolysis and oxidation unit includes multiple groups of high-intensity ultraviolet lamps, which are used to irradiate the gas after the adsorption treatment with ultraviolet light to accelerate the oxidation reaction rate of the residual VOCs gas, wherein the power of each group of high-intensity ultraviolet lamps is greater than or equal to 200W, and each group of high-intensity ultraviolet lamps is used to emit 185nm and 254nm ultraviolet rays.

7. The system according to any one of claims 1 to 6, characterized in that The system also includes a remote monitoring platform, and the intelligent controller is further used to upload a target data set to the remote monitoring platform and store it, wherein the target data set includes the target concentration data and the corresponding frequency data of the fan, and the target concentration data includes the concentration value at the current moment and the concentration value within a preset time period before the current moment; The remote monitoring platform is integrated with a fault prediction model, which is obtained by training historical data using an LSTM model; The remote monitoring platform is also used to predict the target data set according to the fault prediction model to obtain a prediction result, wherein the prediction result is used to represent the change trend of the concentration data of the VOCs gas.

8. A method for purifying VOCs gas, characterized in that: The system applied to any one of claims 1 to 7, comprising: filtering the gas to be purified by the pre-filter to obtain the filtered gas; Acquiring target concentration data of VOCs gas in a target area through the target sensor; Using the intelligent controller to intelligently control the air volume of the fan based on the target concentration data, wherein the fan is located at the input end of the modified zeolite rotor and is used to supply air into the modified zeolite rotor; The filtered gas is subjected to adsorption treatment by the modified zeolite wheel to adsorb part of the VOCs gas to obtain the adsorbed gas, and the adsorbed part of the VOCs gas is desorbed into the storage tank by heating; The UV photolysis and oxidation unit is used to photodegrade the VOCs gas remaining in the gas after the adsorption treatment to obtain the purified tail gas.

9. The method according to claim 8, characterized in that Using an intelligent controller to intelligently control the air volume of the fan based on the target concentration data includes: Establish a matching relationship table between the concentration range of VOCs gas and the fan frequency in advance; In the case where it is determined that the current concentration value is in the first concentration interval, the intelligent controller determines the first frequency corresponding to the first concentration interval based on the matching relationship table, wherein the target concentration data includes the current concentration value, and the matching relationship table includes a corresponding relationship between the first concentration interval and the first frequency; The frequency of the fan is adjusted to the first frequency so that the air volume of the fan matches the first concentration range.

10. The method according to claim 8, characterized in that After obtaining the purified tail gas, the method further comprises: Recovering the heat of the purified tail gas through a waste heat recovery device, wherein the system also includes the waste heat recovery device; The heat of the purified exhaust gas is used to heat the fresh air at the air inlet of the fan.

Images