A printing exhaust gas purification treatment system

Abstract

The application relates to the field of printing waste gas treatment and resource recovery, and particularly discloses a printing waste gas purification treatment system, which comprises an ultrasonic strengthening collection module, a double-stage pretreatment module and the like. The application has the beneficial effect of providing a printing waste gas purification treatment system for printing waste gas treatment and resource recovery. Through real-time monitoring of waste gas concentration, components and particulate matter data, the self-adaptive control system can quickly identify the characteristics of waste gas, and dynamically adjust key operating parameters such as ultrasonic intensity, discharge parameters and condensation temperature. The response time is less than or equal to 0.8 seconds. This intelligent operation mode ensures that the system always operates under optimal conditions, greatly reduces energy consumption, improves the stability of the treatment effect and the anti-impact load capacity, and ultimately achieves comprehensive benefits of economic operation and intelligent management while realizing ultra-low emission, and promotes a fundamental change from fixed and passive waste gas treatment to intelligent and refined waste gas treatment.

Description

Technical Field

[0001] This application relates to the field of printing exhaust gas treatment and resource recycling, and in particular to a printing exhaust gas purification and treatment system. Background Technology

[0002] Traditional printing exhaust gas treatment technologies typically face the dual challenges of low collection efficiency and incomplete purification. Existing gas collection methods struggle to effectively capture exhaust gases that escape at low wind speeds, leading to leaks in the initial collection stage and increasing the load on subsequent treatment. Meanwhile, conventional purification processes, such as single adsorption or combustion methods, are poorly adapted to the complex composition of printing exhaust gases, making it difficult to simultaneously and efficiently remove volatile organic compounds, odors, and fine dust. Furthermore, they are prone to secondary pollution or catalytic poisoning. Solvents, as the main pollutants, are often directly destroyed, resulting in resource waste. Therefore, the industry needs an integrated system that can achieve efficient collection of exhaust gas at the source, synergistic deep purification of multiple pollutants, and recovery of useful solvent components. Current printing exhaust gas treatment systems generally suffer from uneconomical operation and insufficient intelligence. Most systems have fixed parameters and cannot be adjusted in real time according to the dynamic changes in exhaust gas concentration, composition, and operating conditions, resulting in high energy consumption and unstable treatment effects. In addition, valuable organic solvents in the exhaust gas are usually not effectively separated and recovered, and the treatment process is only a cost center. Traditional condensation or adsorption recovery technologies often suffer from low purity of recovered solvents and the inability of a single process to handle solvent mixtures with a wide boiling point range. This prompts the industry to develop a treatment system that can intelligently sense exhaust gas characteristics, adaptively optimize operating parameters, and perform fine and graded recovery of mixed solvents in order to reduce operating costs and create resource recovery benefits. However, in the process of implementing the technical solution, the inventors of this application discovered that the above-mentioned technology has at least the following technical problems: Current printing exhaust gas treatment systems generally suffer from uneconomical operation and insufficient intelligence. Most systems have fixed parameters and cannot be adjusted in real time according to dynamic changes in exhaust gas concentration, composition, and operating conditions, resulting in high energy consumption and unstable treatment effects. In addition, valuable organic solvents in the exhaust gas are often not effectively separated and recovered, and the treatment process is merely a cost center. Traditional condensation or adsorption recovery technologies often suffer from low purity of recovered solvents and the inability of a single process to handle solvent mixtures with a wide boiling point range. This has prompted the industry to develop a treatment system that can intelligently sense exhaust gas characteristics, adaptively optimize operating parameters, and perform refined and graded recovery of mixed solvents to reduce operating costs and create resource recovery benefits. This system achieves a VOCs removal rate of ≥99.5%, a solvent graded recovery rate of ≥92%, high collection efficiency, and stable operation. Summary of the Invention

[0003] This application provides a printing waste gas purification and treatment system, which solves the problems of uneconomical operation and insufficient intelligence that are common in current printing waste gas treatment systems. Most systems have fixed parameters and cannot be adjusted in real time according to the dynamic changes in waste gas concentration, composition and operating conditions, resulting in high energy consumption and unstable treatment effect. In addition, valuable organic solvents in waste gas are usually not effectively separated and recovered, and the treatment process is only a cost center. Traditional condensation or adsorption recovery technologies often have problems such as low purity of recovered solvents and difficulty in handling solvent mixtures with a wide boiling point range by a single process. This has prompted the industry to develop a treatment system that can intelligently sense the characteristics of waste gas, adaptively optimize operating parameters, and perform fine and graded recovery of mixed solvents in order to reduce operating costs and create resource recovery benefits. The system achieves a VOCs removal rate of ≥99.5%, a solvent graded recovery rate of ≥92%, high collection efficiency and stable operation.

[0004] This application provides a printing waste gas purification and treatment system with advantages such as VOCs removal rate ≥99.5%, solvent graded recovery rate ≥92%, high collection efficiency, and stable operation; the technical solution adopted is as follows: including: ultrasonic enhanced collection module, two-stage pretreatment module, dual dielectric barrier discharge-biochar synergistic purification module, solvent graded recovery module, holographic monitoring emission module, and adaptive control system; The ultrasonic enhanced collection module is sealed and connected to the dual-stage pretreatment module via a leak-proof pipe. The output of the dual-stage pretreatment module is connected to the synergistic purification module with a voltage regulator. The output of the synergistic purification module is connected to the input of the solvent graded recovery module. The solvent graded recovery module has two outputs: one is a solvent recovery channel, and the other is connected to the holographic monitoring emission module. The adaptive control system is electrically connected to each module, and multi-parameter dynamic matching is achieved through real-time feedback of exhaust gas characteristics. The dual dielectric barrier discharge-biochar synergistic purification module adopts an integrated "pyrolysis-adsorption-catalysis" structure, and the solvent graded recovery module achieves precise separation and recovery of solvents with different boiling points.

[0005] Optionally, the ultrasonic enhanced collection module includes an array-type ultrasonic gas collection hood, a variable frequency booster fan, and an airflow homogenizer. The gas collection hood has a built-in 28kHz ultrasonic oscillator and an inflatable sealing airbag at its edge. The variable frequency booster fan has a wind pressure adjustment range of 0.8-2.0kPa. The airflow homogenizer adopts a honeycomb flow guide structure to ensure that the exhaust gas enters the subsequent modules evenly.

[0006] Optionally, the dual-stage pretreatment module includes an ultrasonic atomizing washing chamber and an electrostatic condensation chamber connected in series. The atomized particle size of the ultrasonic atomizing washing chamber is ≤30μm, the washing liquid is a composite surfactant solution (mass fraction 0.5%-1.0%), and the gas-liquid ratio is 1:5-1:8. The electrode spacing of the electrostatic condensation chamber is 80-120mm, the applied voltage is 6-10kV, and the dust condensation efficiency is ≥98.5%.

[0007] Optionally, the dual-dielectric barrier discharge-biochar synergistic purification module includes a dual-dielectric barrier discharge reaction section and a biochar catalytic adsorption section. The discharge reaction section adopts a quartz + ceramic dual-dielectric structure, with a discharge frequency of 30-50kHz and a peak voltage of 25-35kV. The biochar catalytic adsorption section is filled with modified biochar loaded with Fe3O4, with a specific surface area ≥1800m² / g and a catalytic activity temperature of 30-60℃.

[0008] Optionally, the solvent fractionation and recovery module includes a low-temperature condensation section, a pressure swing adsorption section, and a membrane separation section. The condensation temperature of the low-temperature condensation section is set in stages (-20℃, 5℃, 25℃). The pressure swing adsorption section is filled with a molecular sieve-silica composite adsorbent with an adsorption pressure of 0.2-0.5MPa. The membrane separation section uses a ceramic-polymer composite membrane with a pore size of 20-50nm and a solvent separation efficiency of ≥95%.

[0009] Optionally, the holographic emission monitoring module integrates a Raman spectroscopy VOCs detector, a laser particle counter, an electronic odor sensor, and a solvent purity analyzer. The VOCs detection limit is ≤0.02mg / m³, the data acquisition frequency is 10Hz, and the detection results are transmitted to the adaptive control system in real time.

[0010] Optionally, the adaptive control system includes an embedded microprocessor, a waste gas characteristic identification algorithm, and a remote control terminal. It can automatically identify more than 12 common solvent components in printing waste gas and dynamically adjust eight key parameters such as discharge power, adsorption pressure, and condensation temperature according to the component concentration, with an adjustment response time ≤0.8s.

[0011] Optionally, the bottom of the ultrasonic atomizing washing chamber is equipped with a gas-liquid separation device and a washing liquid circulation pump. The flow rate of the circulation pump is adjustable from 10 to 30 L / min. The washing liquid is automatically discharged and replaced periodically. The replacement cycle can be set by the adaptive control system based on the turbidity sensor data.

[0012] Optionally, the electrodes of the dual dielectric barrier discharge reaction section are made of titanium alloy and coated with an Al2O3 insulating layer. The biochar catalytic adsorption section is equipped with a steam regeneration device with a regeneration temperature of 110-130℃, a regeneration time of 30-60min, and an adsorption capacity recovery rate of ≥95% after regeneration.

[0013] Optionally, the solvent fractionation and recovery module is linked by a three-way switching valve. The adaptive control system automatically switches the condensation temperature and adsorption pressure according to the solvent components detected by Raman spectroscopy, so as to realize the fractionation and recovery of high-boiling-point (≥100℃), medium-boiling-point (50-100℃), and low-boiling-point (<50℃) solvents, with a total recovery rate of ≥92%.

[0014] In summary, this application includes at least one of the following beneficial technical effects: 1. This printing waste gas purification system significantly improves the efficiency of waste gas capture and pretreatment through ultrasonic enhanced collection and two-stage pretreatment, curbing emissions at the source and laying the foundation for deep purification. The dual-dielectric barrier discharge-biochar synergistic purification module innovatively integrates low-temperature plasma pyrolysis and catalytic adsorption to achieve highly efficient synergistic removal of complex VOCs and odors, with a stable VOCs removal rate of ≥99.5%. The solvent graded recovery module integrates low-temperature condensation, pressure swing adsorption, and membrane separation technologies, enabling refined and high-purity recovery based on solvent boiling point differences, with a total recovery rate of ≥92%. This transforms the treatment process from a cost center into a resource-generating benefit point. The overall system operates stably and reliably, solving the problems of low collection rate, incomplete purification, and serious resource waste associated with traditional technologies.

[0015] 2. This printing waste gas purification system, through real-time monitoring of waste gas concentration, composition, and particulate matter data, has an adaptive control system that can quickly identify waste gas characteristics and dynamically adjust key operating parameters such as ultrasonic intensity, discharge parameters, and condensation temperature, with a response time of ≤0.8 seconds. This intelligent operation mode ensures that the system always operates under optimal conditions, significantly reducing energy consumption and improving the stability of treatment effects and resistance to shock loads. Ultimately, the system achieves ultra-low emissions while realizing comprehensive benefits of economical operation and intelligent management, promoting a fundamental shift in waste gas treatment from fixed and passive to intelligent and refined methods. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a schematic diagram of the two-stage preprocessing module of the present invention; Figure 3 This is a schematic diagram of the collaborative purification module of the present invention; Figure 4 This is a flowchart of the solvent classification and recovery module of the present invention. Detailed Implementation

[0017] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0018] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0019] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0020] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0021] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] This application discloses a printing exhaust gas purification and treatment system, including: an ultrasonic enhanced collection module, a two-stage pretreatment module, a dual dielectric barrier discharge-biochar synergistic purification module, a solvent graded recovery module, a holographic monitoring emission module, and an adaptive control system; The ultrasonic enhanced collection module is sealed and connected to the dual-stage pretreatment module through a leak-proof pipe. The output of the dual-stage pretreatment module is connected to the synergistic purification module with a voltage regulator. The output of the synergistic purification module is connected to the input of the solvent graded recovery module. The solvent graded recovery module has two outputs: one is a solvent recovery channel, and the other is connected to the holographic monitoring emission module. The adaptive control system is electrically connected to each module and achieves dynamic matching of multiple parameters through real-time feedback of exhaust gas characteristics. The dual dielectric barrier discharge-biochar synergistic purification module adopts an integrated "pyrolysis-adsorption-catalysis" structure, and the solvent graded recovery module achieves precise separation and recovery of solvents with different boiling points.

[0023] In the case implementation, the ultrasonic enhanced collection module includes an array-type ultrasonic gas collection hood, a variable frequency booster fan, and an airflow homogenizer. The gas collection hood has a built-in 28kHz ultrasonic oscillator and an inflatable sealing airbag at the edge. The wind pressure adjustment range of the variable frequency booster fan is 0.8-2.0kPa. The airflow homogenizer adopts a honeycomb guide structure to ensure that the exhaust gas enters the subsequent modules evenly.

[0024] Among them, the 28kHz ultrasonic oscillator can cause the suspended solvent droplets in the exhaust gas to cavitate and coalesce, increasing the particle size by 3-5 times. At the same time, the inflatable sealing airbag can flexibly fit with the waste outlet of the printing equipment, with a sealing gap of ≤0.5mm, to prevent the exhaust gas from overflowing during the gas collection process. Through the synergistic design of array-type gas collection layout, variable frequency wind pressure dynamic adaptation and honeycomb flow homogenization, this module can achieve an initial collection efficiency of over 97% for printing waste gas, laying the foundation for the treatment of high-concentration waste gas in subsequent purification and recycling stages.

[0025] In the case implementation, the two-stage pretreatment module includes an ultrasonic atomizing washing chamber and an electrostatic condensation chamber connected in series. The atomized particle size of the ultrasonic atomizing washing chamber is ≤30μm, the washing liquid is a composite surfactant solution (mass fraction 0.5%-1.0%), and the gas-liquid ratio is 1:5-1:8. The electrode spacing of the electrostatic condensation chamber is 80-120mm, the applied voltage is 6-10kV, and the dust condensation efficiency is ≥98.5%.

[0026] Among them, the ultrasonic atomizing washing chamber with an atomization particle size of ≤30μm can significantly increase the contact and collision area with fine dust and solvent droplets in the exhaust gas; the composite surfactant solution can reduce the gas-liquid interfacial tension and enhance the entrainment and capture of hydrophobic organic droplets; the gas-liquid ratio of 1:5-1:8 can balance the washing effect and liquid consumption cost; the electrostatic condensation chamber with an electrode spacing of 80-120mm and a voltage of 6-10kV is adapted to the charge characteristics of fine particulate matter in printing exhaust gas and provides a matching electric field for high condensation efficiency; By using a series of ultrasonic atomizing washing chamber and electrostatic condensation chamber for graded treatment, large-diameter particles and some organic droplets are first captured by the washing chamber, and then the residual fine particles are charged and agglomerated by the electrostatic condensation chamber. This allows the overall particle removal rate of the two-stage pretreatment module to exceed 99%, avoiding reduced operating efficiency of the subsequent purification module due to particle blockage.

[0027] In the case implementation, the dual-dielectric barrier discharge-biochar synergistic purification module includes a dual-dielectric barrier discharge reaction section and a biochar catalytic adsorption section. The discharge reaction section adopts a quartz + ceramic dual-dielectric structure with a discharge frequency of 30-50kHz and a peak voltage of 25-35kV. The biochar catalytic adsorption section is filled with modified biochar loaded with Fe3O4, with a specific surface area ≥1800m² / g and a catalytic activity temperature of 30-60℃.

[0028] The quartz + ceramic dual-dielectric structure not only improves the uniformity of the electric field in the discharge area, but also prevents the electrodes from being corroded by corrosive components in the waste gas. The combination of a discharge frequency of 30-50kHz and a peak voltage of 25-35kV can efficiently excite active free radicals (such as •OH) to achieve molecular bond cleavage of benzene series compounds, esters and other recalcitrant VOCs in printing waste gas. The modified biochar loaded with Fe3O4 has a large specific surface area of ​​≥1800m² / g, which enhances the physical adsorption capacity of VOCs. The catalytic activity temperature of 30-60℃ is suitable for the normal temperature emission conditions of printing waste gas. Fe3O4 can also catalyze the reaction between active free radicals and VOC intermediates, thereby improving the mineralization efficiency. By leveraging the "pyrolysis" effect of the dual-medium barrier discharge reaction section and the synergistic effect of "adsorption enrichment + catalytic mineralization" in the biochar catalytic adsorption section, large molecular VOCs are first pyrolyzed into easily treatable intermediate products, which are then adsorbed and catalyzed by biochar to be converted into CO2 and H2O. This achieves the goal of VOCs removal rate ≥99.5% and reduces consumable costs through biochar thermal desorption and regeneration.

[0029] In the case implementation, the solvent fractionation and recovery module includes a low-temperature condensation section, a pressure swing adsorption (PSA) section, and a membrane separation section. The condensation temperature of the low-temperature condensation section is set in stages (-20℃, 5℃, 25℃). The PSA section is filled with a molecular sieve-silica composite adsorbent with an adsorption pressure of 0.2-0.5MPa. The membrane separation section uses a ceramic-polymer composite membrane with a pore size of 20-50nm and a solvent separation efficiency of ≥95%.

[0030] The low-temperature condensation section's staged temperatures (-20℃, 5℃, 25℃) are matched to high, medium, and low boiling point solvents in the printing waste gas (e.g., solvents with boiling points >80℃ can be condensed and recovered at 25℃, while those with boiling points 40-80℃ are condensed at 5℃), achieving preliminary and precise separation. The molecular sieve-silica composite adsorbent balances adsorption capacity and selectivity for medium and low boiling point solvents, and an adsorption pressure of 0.2-0.5MPa balances adsorption efficiency and energy consumption. The ceramic-polymer composite membrane's 20-50nm pore size is adapted to the permeation characteristics of small molecule solvents, while the ceramic substrate enhances the membrane's resistance to solvent corrosion. By employing a graded and synergistic process—enriching high-boiling-point solvents in a low-temperature condensation section, capturing medium-boiling-point components in a pressure swing adsorption section, and retaining low-boiling-point small-molecule solvents in a membrane separation section—precise fractional recovery of different types of solvents is achieved. This process ensures that the solvent fractional recovery rate of the module consistently reaches ≥92%, and the recovered solvents can be directly reused in the printing process, reducing raw material costs.

[0031] In the case implementation, the holographic monitoring emission module integrates a Raman spectroscopy VOCs detector, a laser particle counter, an electronic odor sensor, and a solvent purity analyzer. The VOCs detection limit is ≤0.02mg / m³, the data acquisition frequency is 10Hz, and the detection results are transmitted to the adaptive control system in real time.

[0032] Among them, the Raman spectroscopy VOCs detector has an ultra-low detection limit of ≤0.02mg / m³, which can accurately capture trace VOCs residues in the exhaust gas, covering characteristic components such as benzene and esters in printing waste gas; the laser particle counter can simultaneously monitor the number concentration of particulate matter in the exhaust gas, verifying the end-of-pipe purification effect of the two-stage pretreatment module; the electronic odor sensor can identify molecular-level odor pollutants, avoiding the hidden emission problem of "concentration meets the standard but there is an odor"; the solvent purity analyzer monitors the purity index of the recovered solvent in real time, and the high data acquisition frequency of 10Hz can ensure zero delay in monitoring data and accurately reflect the system's operating status; By integrating multiple types of detection equipment, the system achieves comprehensive monitoring of "VOCs concentration + particulate matter quantity + odor level + solvent purity". Combined with real-time data transmission, it ensures that the emissions consistently meet the ultra-low emission standards (VOCs≤0.02mg / m³) and dynamically controls the quality of the recovered solvent, providing accurate operational feedback for the adaptive control system.

[0033] In the case implementation, the adaptive control system includes an embedded microprocessor, a waste gas characteristic identification algorithm, and a remote control terminal. It can automatically identify more than 12 common solvent components in printing waste gas and dynamically adjust 8 key parameters such as discharge power, adsorption pressure, and condensation temperature according to the component concentration, with an adjustment response time of ≤0.8s.

[0034] The embedded microprocessor is the core of the system's computing power, supporting parallel operation and synchronous adjustment of parameters across multiple modules. The exhaust gas component identification algorithm has a built-in spectral matching library of more than 12 characteristic solvents in the printing industry (such as toluene, ethyl acetate, isopropanol, etc.), which can quickly and accurately match the type and concentration of exhaust gas components. The eight adjustment parameters correspond to the operating parameters of core modules such as the dual dielectric barrier discharge module (discharge power), the pressure swing adsorption section (adsorption pressure), and the low-temperature condensation section (condensation temperature). The response time of ≤0.8s can accurately match the instantaneous fluctuations of printing exhaust gas components. By linking real-time data from the holographic monitoring emission module and precise determination by the exhaust gas component identification algorithm, the embedded microprocessor drives the dynamic adaptation of parameters of each core module. This avoids the risk of energy redundancy or purification failure when running with fixed parameters, and enables unattended operation and remote maintenance of the system through a remote control terminal, ensuring that the entire exhaust gas treatment system is always in a highly efficient, energy-saving, and stable operating state.

[0035] In the case implementation, the bottom of the ultrasonic atomizing washing chamber is equipped with a gas-liquid separation device and a washing liquid circulation pump. The flow rate of the circulation pump is adjustable from 10 to 30 L / min. The washing liquid is automatically discharged and replaced periodically. The replacement cycle can be set by the adaptive control system based on the turbidity sensor data.

[0036] Among them, the gas-liquid separation device can efficiently separate particulate matter and organic mist droplets carried in the washing liquid, preventing them from entering the circulation pump and causing pump blockage or component wear; the circulation flow rate adjustment range of 10-30L / min can adapt to the exhaust gas treatment load of different printing production lines, ensuring that the washing liquid and exhaust gas form a sufficient contact reaction environment in the chamber; the turbidity sensor can collect the turbidity data of the washing liquid in real time, providing a precise replacement trigger basis for the adaptive control system, and avoiding the reduction of the capture effect after the washing liquid is over-contaminated; By employing a synergistic design that ensures the cleanliness of the circulating liquid through a gas-liquid separation device, dynamically adapts the flow rate of the circulating pump, and precisely controls the replacement cycle of the washing liquid through an adaptive control system, the system achieves efficient recycling of the washing liquid (reducing washing liquid consumption by approximately 40%), while eliminating the need for manual monitoring of the washing liquid status and continuously maintaining the stable washing efficiency of the ultrasonic atomizing washing chamber.

[0037] In the case implementation, the electrodes of the dual dielectric barrier discharge reaction section are made of titanium alloy and coated with an Al2O3 insulating layer. The biochar catalytic adsorption section is equipped with a steam regeneration device with a regeneration temperature of 110-130℃ and a regeneration time of 30-60min. The adsorption capacity recovery rate after regeneration is ≥95%.

[0038] Among them, the titanium alloy electrode has strong corrosion resistance and is suitable for the working conditions of printing exhaust gas containing solvents and weakly acidic components; the Al2O3 insulating layer coated on the surface not only improves the insulation strength of the electrode, but also resists high-frequency impacts during the discharge process, extending the service life of the electrode; the regeneration temperature of 110-130℃ can efficiently desorb the solvent components adsorbed by biochar without destroying the catalytic activity of the supported Fe3O4; the regeneration time of 30-60min can be flexibly adjusted according to the adsorption saturation of biochar, and the adsorption capacity recovery rate of ≥95% ensures the performance stability of the regenerated biochar. The long-term stable operation of the discharge reaction section is ensured by titanium alloy + Al2O3 insulating layer electrodes. Combined with the periodic regeneration of biochar by the steam regeneration device, the consumables of the biochar catalytic adsorption section are recycled (reducing the cost of biochar replacement by about 80%), and its adsorption-catalysis efficiency is maintained. Furthermore, the intelligent determination of the regeneration timing by the adaptive control system further balances the regeneration energy consumption and equipment operating efficiency.

[0039] In the case implementation, the solvent fractionation and recovery module is linked by a three-way switching valve. The adaptive control system automatically switches the condensation temperature and adsorption pressure according to the solvent components detected by Raman spectroscopy, so as to realize the fractionation and recovery of high boiling point (≥100℃), medium boiling point (50-100℃), and low boiling point (<50℃) solvents, with a total recovery rate of ≥92%.

[0040] Among them, the three-way switching valve can realize seamless and rapid linkage switching between the low-temperature condensation, pressure swing adsorption, and membrane separation sections, avoiding the mixing of solvents with different boiling points between sections; high-boiling-point (≥100℃) solvents can be efficiently condensed at a staged temperature of 25℃ in the low-temperature condensation section, medium-boiling-point (50-100℃) solvents are matched with a condensation temperature of 5℃ + adsorption pressure of 0.2-0.3MPa, and low-boiling-point (<50℃) solvents are adapted to their volatile and difficult-to-condense characteristics through a combination process of -20℃ condensation + adsorption pressure of 0.4-0.5MPa + membrane separation section; By using the linkage control of the three-way switching valve and the precise matching of the "component-parameter" of the adaptive control system, solvents in different boiling point ranges can be recycled in a targeted manner. This not only solves the problem of insufficient adaptability of a single recycling process to multi-boiling point solvents, but also improves the purity of each solvent through fractional recycling (recycled solvent purity ≥98%), ultimately achieving a stable total recovery rate of ≥92%. The recycled solvents can be directly reused in the printing process.

[0041] When implementing this procedure, please follow these steps: 1) The adaptive control system is started. Each module completes self-test and initialization. The system enters standby mode and is ready to receive exhaust gas. 2) After the exhaust gas enters, the holographic monitoring module analyzes its concentration and composition in real time, and the adaptive control system dynamically adjusts key parameters such as collection wind pressure, discharge power, and condensation temperature accordingly to achieve efficient purification and targeted recovery. 3) During system operation, the adaptive control system automatically triggers the steam regeneration program of the biochar catalytic adsorption section based on sensor data, and controls the periodic discharge and replacement of the washing liquid to maintain the optimal performance of each module. 4) The purified gas is discharged after being confirmed to meet the standards by the holographic monitoring module; the recovered solvent is transported to the storage tank for reuse after purity analysis and it is qualified. The data of the whole process is recorded and uploaded in real time.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A printing exhaust gas purification and treatment system, characterized in that, include: The system includes an ultrasonic enhanced collection module, a two-stage pretreatment module, a dual-dielectric barrier discharge-biochar synergistic purification module, a solvent graded recovery module, a holographic monitoring emission module, and an adaptive control system. The ultrasonic enhanced collection module is sealed and connected to the dual-stage pretreatment module through a leak-proof pipe. The output of the dual-stage pretreatment module is connected to the synergistic purification module with a voltage regulator. The output of the synergistic purification module is connected to the input of the solvent graded recovery module. The solvent graded recovery module has two outputs: one is a solvent recovery channel, and the other is connected to the holographic monitoring emission module. The adaptive control system is electrically connected to each module and achieves dynamic matching of multiple parameters through real-time feedback of exhaust gas characteristics. The dual dielectric barrier discharge-biochar synergistic purification module adopts an integrated "pyrolysis-adsorption-catalysis" structure, and the solvent graded recovery module achieves precise separation and recovery of solvents with different boiling points.

2. The printing exhaust gas purification system according to claim 1, characterized in that: The ultrasonic enhanced collection module includes an array-type ultrasonic gas collection hood, a variable frequency booster fan, and an airflow homogenizer. The gas collection hood has a built-in 28kHz ultrasonic oscillator and an inflatable sealing airbag at the edge. The wind pressure adjustment range of the variable frequency booster fan is 0.8-2.0kPa. The airflow homogenizer adopts a honeycomb flow guide structure to ensure that the exhaust gas enters the subsequent modules evenly.

3. The printing exhaust gas purification system according to claim 2, characterized in that: The dual-stage pretreatment module includes an ultrasonic atomizing washing chamber and an electrostatic condensation chamber connected in series. The atomized particle size of the ultrasonic atomizing washing chamber is ≤30μm, the washing liquid is a composite surfactant solution (mass fraction 0.5%-1.0%), and the gas-liquid ratio is 1:5-1:

8. The electrode spacing of the electrostatic condensation chamber is 80-120mm, the applied voltage is 6-10kV, and the dust condensation efficiency is ≥98.5%.

4. The printing exhaust gas purification system according to claim 1, characterized in that: The dual-dielectric barrier discharge-biochar synergistic purification module includes a dual-dielectric barrier discharge reaction section and a biochar catalytic adsorption section. The discharge reaction section adopts a quartz + ceramic dual-dielectric structure, with a discharge frequency of 30-50kHz and a peak voltage of 25-35kV. The biochar catalytic adsorption section is filled with modified biochar loaded with Fe3O4, with a specific surface area ≥1800m² / g and a catalytic activity temperature of 30-60℃.

5. The printing exhaust gas purification system according to claim 4, characterized in that: The solvent fractionation and recovery module includes a low-temperature condensation section, a pressure swing adsorption section, and a membrane separation section. The condensation temperature of the low-temperature condensation section is set in stages (-20℃, 5℃, 25℃). The pressure swing adsorption section is filled with a molecular sieve-silica composite adsorbent with an adsorption pressure of 0.2-0.5MPa. The membrane separation section uses a ceramic-polymer composite membrane with a pore size of 20-50nm and a solvent separation efficiency of ≥95%.

6. The printing exhaust gas purification system according to claim 1, characterized in that: The holographic emission monitoring module integrates a Raman spectroscopy VOCs detector, a laser particle counter, an electronic odor sensor, and a solvent purity analyzer. The VOCs detection limit is ≤0.02mg / m³, the data acquisition frequency is 10Hz, and the detection results are transmitted to the adaptive control system in real time.

7. The printing exhaust gas purification system according to claim 6, characterized in that: The adaptive control system includes an embedded microprocessor, a waste gas characteristic identification algorithm, and a remote control terminal. It can automatically identify more than 12 common solvent components in printing waste gas and dynamically adjust eight key parameters such as discharge power, adsorption pressure, and condensation temperature according to the component concentration, with an adjustment response time of ≤0.8s.

8. The printing exhaust gas purification system according to claim 1, characterized in that: The bottom of the ultrasonic atomizing washing chamber is equipped with a gas-liquid separation device and a washing liquid circulation pump. The flow rate of the circulation pump is adjustable from 10 to 30 L / min. The washing liquid is automatically discharged and replaced periodically. The replacement cycle can be set by the adaptive control system based on the turbidity sensor data.

9. The printing exhaust gas purification system according to claim 1, characterized in that: The electrodes of the dual dielectric barrier discharge reaction section are made of titanium alloy and coated with an Al2O3 insulating layer. The biochar catalytic adsorption section is equipped with a steam regeneration device with a regeneration temperature of 110-130℃ and a regeneration time of 30-60 min. The regeneration capacity recovery rate is ≥95%.

10. The printing exhaust gas purification system according to claim 1, characterized in that: The solvent fractionation and recovery module is linked by a three-way switching valve. The adaptive control system automatically switches the condensation temperature and adsorption pressure according to the solvent components detected by Raman spectroscopy, so as to realize the fractionation and recovery of high boiling point (≥100℃), medium boiling point (50-100℃), and low boiling point (<50℃) solvents, with a total recovery rate of ≥92%.

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