System and method for treating acetone and by-products thereof through multi-stage discharge
By using a multi-stage discharge processing system and parameter adjustment, the problems of high catalyst cost and insufficient by-product control in low-temperature plasma technology have been solved. This has enabled the efficient degradation of acetone gas and avoided the generation of NOx, N2O and O3, giving it economic and environmental advantages.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA PETROLEUM & CHEMICAL CORP
- Filing Date
- 2024-10-16
- Publication Date
- 2026-04-17
AI Technical Summary
Existing low-temperature plasma technology suffers from high catalyst costs when treating carbonyl odorous substances. At the same time, the control efficiency of NOx and O3 byproducts during gas discharge is insufficient, leading to the generation of photochemical pollutants.
A multi-stage discharge treatment system is adopted, including a primary gas discharge device, a secondary gas discharge device, and a final gas discharge device. By adjusting the parameters of the pulse power supply and AC power supply, combined with the gas supply module and the auxiliary gas module, the system can efficiently degrade acetone gas and remove NOx, N2O and O3 byproducts.
It achieves efficient removal of acetone gas, avoids the generation of byproducts, reduces technical investment costs, and produces no secondary pollution, thus having economic and environmental advantages.
Smart Images
Figure CN121869059A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of gas discharge technology, and more specifically to a system and method for multi-stage discharge treatment of acetone and its byproducts. Background Technology
[0002] The high reaction efficiency and flexible excitation methods of low-temperature plasma technology make it highly advantageous in environmental protection, materials, and medicine. Plasma generation is based on external energy excitation, inducing the ionization of molecules in the reaction space to produce a series of reactive particle clusters. In recent years, with the increasing demand for odor control, the advantages of high-reactivity low-temperature plasma in odor control have become increasingly apparent. However, odors involve a wide variety of substances, among which carbonyl odors have high bond energies due to their C=O functional groups, requiring high energy injection for bond breaking. Therefore, plasma has the advantages of high energy and high activity in the treatment of carbonyl odors; however, further efforts are needed to achieve deep oxidation of carbonyl odors. Currently, most studies on the efficient treatment of carbonyl odors with low-temperature plasma rely on synergistic catalysis. The investment of catalysts significantly increases operating costs, and the catalyst's operating cycle is also a major factor restricting its widespread application. Research on improving the oxidation depth of carbonyl odors based solely on low-temperature plasma technology is still limited.
[0003] Furthermore, gas discharge, as a process of ionizing gas molecules under gaseous conditions with external energy excitation, is a typical method of generating low-temperature plasma. Typically, under air conditions, gas discharge processes, in addition to generating a large number of highly reactive particles through excitation ionization, also produce a certain amount of NOx and O3 byproducts. NOx is a typical photochemical pollutant, while excessive O3 emissions are a significant factor in inducing photochemical smog. Currently, there is limited research on the comprehensive control of NOx and O3 during gas discharge processes. Atmospheric NOx control mainly relies on wet scrubbing and selective catalytic reduction, while O3 control is largely based on ozone decomposition technology using catalytic reactions. However, these technologies suffer from insufficient denitrification efficiency and increased raw material costs.
[0004] Therefore, there is an urgent need for a system and method for multi-stage discharge treatment of acetone and its byproducts, so as to degrade acetone gas while avoiding the generation of byproducts. Summary of the Invention
[0005] The purpose of this invention is to address the current problem that most methods for treating carbonyl odors and controlling NOx and O3 byproducts using low-temperature plasma rely on synergistic catalysis, which results in high catalyst costs. This invention provides a system, method, electronic device, and machine-readable storage medium for multi-stage discharge treatment of acetone and its byproducts.
[0006] To achieve the above objectives, the first aspect of the present invention provides a system for multi-stage discharge treatment of acetone and its byproducts, the system comprising a primary gas discharge device, at least one secondary gas discharge device, a gas supply module, and a tail gas analysis module.
[0007] The gas supply module is used to supply the gas to be treated into the primary gas discharge device. The primary gas discharge device discharges the gas to be treated that enters it under the action of its pulse power supply. The exhaust gas analysis module is used to analyze the gas composition and concentration after discharge and feed back the gas analysis results to the pulse power supply. The pulse power supply is used to remove NOx from the gas and pre-degrade the gas to be treated through the primary gas discharge device according to the gas analysis results to obtain primary treated gas. The secondary gas discharge device is used to completely degrade the gas to be treated in the primary treated gas under the action of its secondary AC power supply.
[0008] Preferably, it further includes a final-stage gas discharge device and an auxiliary gas module for supplying a set component and concentration of gas into the final-stage gas discharge device. The final-stage gas discharge device is used to adjust the concentration of the primary treated gas after the gas to be treated has been completely degraded by the secondary gas discharge device and to remove ozone under the action of its final-stage AC power supply and the auxiliary gas module.
[0009] Preferably, the pulse power supply, the secondary AC power supply, and the final AC power supply all include parameter regulators, wherein the regulating parameters include frequency, voltage, duty cycle, rising edge, and falling edge.
[0010] Preferably, the gas supply module includes an acetone mass flow controller for controlling the concentration of acetone gas; the auxiliary gas module includes an N2 mass flow controller and an O2 mass flow controller for controlling the concentrations of N2 and O2 respectively, to obtain a set N:O ratio gas.
[0011] Preferably, the primary gas discharge device, the secondary gas discharge device, and the final gas discharge device all include a high-voltage electrode, a low-voltage electrode, and an outer insulating dielectric layer. The low-voltage electrode and the high-voltage electrode are coaxially arranged inside the outer insulating dielectric layer. The outer surface of the high-voltage electrode is covered with an inner insulating dielectric layer. A set distance is maintained between the high-voltage electrode and the low-voltage electrode.
[0012] A second aspect of the present invention provides a method for multi-stage discharge treatment of acetone and its byproducts, applied to the system described above, the method comprising the following steps:
[0013] S1. The gas supply module delivers the gas to be processed to the primary gas discharge device;
[0014] S2. The primary gas discharge device discharges the gas to be processed that enters it under the action of its pulse power supply.
[0015] S3. The exhaust gas analysis module analyzes the gas composition and concentration after discharge and feeds back the gas analysis results to the pulse power supply.
[0016] S4. The pulse power supply removes NOx from the gas and pre-degrades the gas to be treated using the primary gas discharge device based on the gas analysis results, so as to obtain primary treated gas.
[0017] S5. The secondary gas discharge device completely degrades the gas to be treated in the primary gas under the action of its secondary AC power supply.
[0018] Preferably, in step S4, the pulse power supply removes NOx from the gas and pre-degrades the gas to be treated using the primary gas discharge device based on the gas analysis results, specifically including:
[0019] Based on the initial discharge voltage, the frequency of the pulse power supply is adjusted to obtain the pulse frequency f. i With discharge power P i The changing pattern between them, and obtain P i Reaching the maximum value P max The pulse frequency f0 is determined, and then, based on the gas analysis results as the pulse voltage of the pulse power supply increases from the initial value to the maximum value, the pulse voltage E0 at which the concentrations of NO and NO2 increase exponentially with the increase of the pulse voltage of the pulse power supply is obtained. Then, based on the pulse voltage of the pulse power supply being E0, its duty cycle is reduced until the concentrations of NO and NO2 in the gas analysis results are zero, and the duty cycle D0 at this time is obtained.
[0020] Preferably, in step S4, the pulse power supply removes NOx from the gas and pre-degrades the gas to be treated using the primary gas discharge device based on the gas analysis results, specifically further including:
[0021] With the pulse voltage of the pulse power supply at E0 and the duty cycle at D0, the pulse voltage is increased to E1. If the concentrations of NO and NO2 in the gas analysis results are zero, but the concentration of N2O increases, the pulse voltage of the pulse power supply is further increased to E2, until the concentration of N2O no longer increases with the increase of the pulse voltage, even when the concentrations of NO and NO2 are zero. The pulse voltage E at this point is then obtained. i and duty cycle D i .
[0022] Preferably, in step S4, the pulse power supply removes NOx from the gas and pre-degrades the gas to be treated using the primary gas discharge device based on the gas analysis results, specifically further including:
[0023] If the concentrations of NO and NO2 in the gas analysis results are not zero, then reduce the duty cycle from D0 until the concentrations of NO and NO2 are zero, and obtain the duty cycle D1 at this point. Then, based on the pulse voltage of the pulse power supply at E1 and the duty cycle at D1, increase the pulse voltage of the pulse power supply to E2, until the concentrations of NO and NO2 in the gas analysis results reach zero as the pulse voltage of the pulse power supply increases, and the concentration of N2O no longer increases. Obtain the pulse voltage E of the pulse power supply at this point. i and duty cycle D i .
[0024] Preferably, in step S4, the pulse power supply removes NOx from the gas and pre-degrades the gas to be treated using the primary gas discharge device based on the gas analysis results, specifically further including:
[0025] The pulse frequency of the pulse power supply is f0 and the duty cycle is D. i Based on this, increase the pulse voltage. If the concentration of acetone gas decreases as the pulse voltage increases, continue to increase the pulse voltage until the concentration of acetone gas no longer changes as the pulse voltage increases. Then keep the current pulse voltage unchanged.
[0026] Preferably, in step S5, the secondary gas discharge device, under the action of its secondary AC power supply, completely degrades the gas to be treated in the primary treated gas, specifically including:
[0027] Based on the initial discharge voltage, the frequency of the secondary AC power supply is adjusted to obtain the AC frequency f. j With discharge power P j The changing pattern between them, and obtain P j Reaching the maximum value P max The AC frequency is f1, and then the AC voltage of the secondary AC power supply is increased. If the ozone concentration decreases with the increase of AC voltage, and there is no NO or NO2 in the primary treated gas, then the AC voltage is further increased. When the AC voltage changes from U... j Increase to U j+1 If NO and / or NO2 begin to appear in the treated gas, the AC voltage remains at U. j The concentration of acetone gas in the treated gas remains unchanged, and it is confirmed that the concentration is greater than zero. If it is greater than zero, at least one AC stage with frequency f1 and AC voltage U is connected in series. jThe secondary gas discharge device degrades acetone gas until the acetone gas is completely degraded.
[0028] Preferably, the method further includes: step S6, where the auxiliary gas module supplies a gas with a set composition and concentration to the final gas discharge device, wherein the final gas discharge device, under the action of its final AC power supply and the auxiliary gas module, adjusts the concentration of the primary treated gas after the gas to be treated has been completely degraded by the secondary gas discharge device and removes ozone, wherein the set composition is N2 and O2.
[0029] Preferably, adjusting the concentration of the primary treated gas and removing ozone after the secondary gas discharge device has completely degraded the gas to be treated specifically includes:
[0030] The AC frequency of the final stage AC power supply is f1, and the AC voltage is U. j The concentrations of N2O (C0) and O3 in the gas are obtained. Then, N2 and O2 with a set N:O ratio are supplied to the final stage gas discharge device. If C1 < C0, the N:O ratio of N2 and O2 is continuously increased until the N2O concentration C1 is reached. i It no longer decreases with increasing N:O ratio of N2 and O2; if C1 > C0, then decrease the N:O ratio of N2 and O2 until the concentration of N2O C i It no longer decreases as the N:O ratio of N2 and O2 decreases; finally, at an AC voltage of U... j Continue increasing the voltage until the O3 concentration drops to zero.
[0031] A third aspect of the present invention provides an electronic device including at least one processor, at least one memory, and a communication interface; the processor, the memory, and the communication interface communicate with each other; the memory stores program instructions executable by the processor, and the processor invokes the program instructions to perform the above-described method for multi-stage discharge treatment of acetone and its byproducts.
[0032] A fourth aspect of the present invention provides a machine-readable storage medium storing instructions that enable the machine-readable storage medium to perform the above-described method for multi-stage discharge treatment of acetone and its byproducts.
[0033] According to the above technical solution, the system and method for treating acetone and its byproducts based on the multi-stage discharge treatment, by using a primary gas discharge device and at least one secondary gas discharge device in combination, can achieve efficient removal of acetone gas and effectively avoid the generation of byproducts in practical applications, without additional technical investment and additional costs. It has the technical advantages of high efficiency and economy, no secondary pollution, and economic advantages of no secondary treatment costs.
[0034] Meanwhile, by further configuring the final-stage gas discharge device to adjust the concentration of the primary treated gas after the gas to be treated has been completely degraded by the secondary gas discharge device and remove ozone under the action of its final-stage AC power supply and the auxiliary gas module, the generation of by-products can be further effectively avoided. Attached Figure Description
[0035] Figure 1 This is a schematic diagram of a system for multi-stage discharge treatment of acetone and its byproducts.
[0036] Figure 2 This is a schematic diagram of the primary, secondary, and final stage gas discharge device of a multi-stage discharge system for treating acetone and its byproducts.
[0037] Figure 3 This is a graph showing the variation of NOx and O3 in gas discharge under pulsed discharge conditions.
[0038] Figure 4 This is a graph showing the variation of acetone gas under alternating current discharge conditions;
[0039] Figure 5 This is a graph showing the variation of NOx and O3 during gas discharge under specific gas ratio conditions.
[0040] Figure 6 This is a flowchart of a method for multi-stage discharge treatment of acetone and its byproducts.
[0041] Explanation of reference numerals in the attached figures
[0042] 1. Pulse power supply; 2. Primary gas discharge device; 3. Secondary AC power supply; 4. Secondary gas discharge device; 5. Final AC power supply; 6. Final gas discharge device; 7. Auxiliary gas module; 8. Gas supply module; 9. Exhaust gas analysis module; 10. High-voltage electrode; 11. Outer insulating dielectric layer; 12. Low-voltage electrode; 13. Inner insulating dielectric layer; 14. Air inlet; 15. Air outlet. Detailed Implementation
[0043] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.
[0044] The first aspect of this invention provides a system for multi-stage discharge treatment of acetone and its byproducts, such as... Figure 1-2 As shown, the system for multi-stage discharge treatment of acetone and its byproducts includes a primary gas discharge device 2, at least one secondary gas discharge device 4, a gas supply module 8, and a tail gas analysis module 9.
[0045] The gas supply module 8 is used to supply the gas to be treated into the primary gas discharge device 2. The primary gas discharge device 2 discharges the gas to be treated that enters it under the action of its pulse power supply 1. The exhaust gas analysis module 9 is used to analyze the gas composition and concentration after discharge and feed back the gas analysis results to the pulse power supply 1. The pulse power supply 1 is used to remove NOx from the gas and pre-degrade the gas to be treated through the primary gas discharge device 2 according to the gas analysis results to obtain primary treated gas. The secondary gas discharge device 4 is used to completely degrade the gas to be treated in the primary treated gas under the action of its secondary AC power supply 3.
[0046] According to the above technical solution, the system for treating acetone and its byproducts based on the multi-stage discharge method, by using a primary gas discharge device and at least one secondary gas discharge device in combination, can achieve efficient removal of acetone gas and effectively avoid the generation of byproducts (NO and NO2) in practical applications, without additional technical investment and additional costs. It has the technical advantages of high efficiency and economy, no secondary pollution, and economic advantages of no secondary treatment costs.
[0047] In the multi-stage discharge system for treating acetone and its byproducts described in this invention, preferably, it further includes a final-stage gas discharge device 6 and an auxiliary gas module 7 for supplying a gas with a set composition and concentration to the final-stage gas discharge device 6. The final-stage gas discharge device 6 is used to adjust the concentration of the primary treated gas after the gas to be treated has been completely degraded by the secondary gas discharge device 4 and remove ozone under the action of its final-stage AC power supply 5 and the auxiliary gas module 7, thereby further effectively avoiding the generation of byproducts (N2O and O3).
[0048] In the multi-stage discharge system for treating acetone and its byproducts described in this invention, preferably, the gas supply module 8 includes an acetone mass flow controller for controlling the concentration of acetone gas; the auxiliary gas module 7 includes an N2 mass flow controller and an O2 mass flow controller for controlling the concentrations of N2 and O2 respectively, to obtain a set N:O ratio gas.
[0049] Specifically, in the initial state, the gas supply module 8 supplies acetone gas of a set concentration to the primary gas discharge device 2 as needed and maintains it constant. Then, the tail gas analysis module 9 analyzes the composition and concentration of the gas after discharge and feeds the analysis results back to the pulse power supply 1. The pulse power supply 1, based on the changes in NO, NO2, and N2O concentrations with its output pulse voltage, obtains the output voltage E0 when the NO and NO2 concentrations show an exponential increase. Based on the output voltage E0, it adjusts the duty cycle and voltage of its regulating parameters to control the production of NO and NO2 in the NOx products. Meanwhile, the auxiliary gas module 7 adjusts the N:O ratio of N2 and O2 supplied to the final gas discharge device 6 to regulate the gas concentration within the final gas discharge device 6, thereby achieving N2O removal.
[0050] In the multi-stage discharge system for treating acetone and its byproducts described in this invention, preferably, as follows: Figure 2 As shown, the primary gas discharge device 2, the secondary gas discharge device 4, and the final gas discharge device 6 are coaxial cylindrical dual-dielectric barrier discharge devices, each including a high-voltage electrode 10, a low-voltage electrode 12, and an outer insulating dielectric layer 11. The low-voltage electrode 12 and the high-voltage electrode 10 are coaxially arranged inside the outer insulating dielectric layer 11. The outer surface of the high-voltage electrode 10 is covered with an inner insulating dielectric layer 13. A set distance is maintained between the high-voltage electrode 10 and the low-voltage electrode 12, and this set distance is the gas discharge area. Specifically, the high-voltage electrode is connected to the high-voltage output terminal of its driving power supply, and the low-voltage electrode is safely connected to the grounding electrode. The copper foil low-voltage electrode has a width of 10mm. A quartz medium is positioned between the high-voltage and low-voltage electrodes, comprising an outer quartz medium (outer insulating dielectric layer 11) and an inner quartz medium (inner insulating dielectric layer 13). The inner quartz medium has an outer diameter of 6mm and an inner diameter of 4mm, with its inner surface in contact with the stainless steel high-voltage electrode. The outer quartz medium has an inner diameter of 8mm and an outer diameter of 10mm, with its outer surface being the copper foil low-voltage electrode. The distance between the inner and outer quartz media is 1mm. More specifically, each of the above gas discharge devices has a semi-sealed structure, including an inlet 14 and an outlet 15, and as shown... Figure 1 The devices are connected sequentially as shown. The primary gas discharge device 2, the secondary gas discharge device 4, and the final gas discharge device 6, along with their respective connected drive power supplies, also include circuits for connection between the two, and electrical parameter detection devices such as high-voltage probes, current probes, and oscilloscopes. The pulse power supply 1, the secondary AC power supply 3, and the final AC power supply 5 each include a parameter regulator, wherein the regulating parameters include frequency, voltage, duty cycle, rising edge, and falling edge.
[0051] A second aspect of the present invention provides a method for multi-stage discharge treatment of acetone and its byproducts, applied to the system described above, such as... Figure 6 As shown, the method includes the following steps:
[0052] S1. The gas supply module 8 delivers the gas to be processed to the primary gas discharge device 2; specifically, the gas to be processed is acetone gas.
[0053] S2. The primary gas discharge device 2 discharges the gas to be processed that enters it under the action of its pulse power supply 1.
[0054] S3. The exhaust gas analysis module 9 analyzes the gas composition and concentration after discharge and feeds back the gas analysis results to the pulse power supply 1.
[0055] S4. The pulse power supply 1 removes NOx from the gas and pre-degrades the gas to be treated through the primary gas discharge device 2 based on the gas analysis results to obtain primary treated gas.
[0056] S5. The secondary gas discharge device 4, under the action of its secondary AC power supply 3, completely degrades the gas to be treated in the primary gas.
[0057] According to the above technical solution, the method for treating acetone and its byproducts based on the multi-stage discharge method, by using a primary gas discharge device and at least one secondary gas discharge device in combination, can achieve efficient removal of acetone gas and effectively avoid the generation of byproducts in practical applications, without additional technical investment and additional costs. It has the technical advantages of high efficiency and economy, no secondary pollution, and economic advantages of no secondary treatment costs.
[0058] In the multi-stage discharge treatment method for acetone and its byproducts described in this invention, preferably, in step S4, the pulse power supply 1 removes NOx from the gas and pre-degrades the gas to be treated using the primary gas discharge device 2 based on the gas analysis results, specifically including:
[0059] Based on the initial discharge voltage, the frequency of the pulse power supply 1 is adjusted to obtain the pulse frequency f. i With discharge power P i The changing pattern between them, and obtain P i Reaching the maximum value P maxThe pulse frequency f0 is determined, and then, based on the gas analysis results as the pulse voltage of the pulse power supply 1 increases from the initial value to the maximum value, the pulse voltage E0 at which the concentrations of NO and NO2 increase exponentially with the increase of the pulse voltage of the pulse power supply 1 is obtained. Then, based on the pulse voltage of the pulse power supply 1 being E0, its duty cycle is reduced until the concentrations of NO and NO2 in the gas analysis results are zero, and the duty cycle D0 at this time is obtained.
[0060] It also includes: based on the pulse voltage of the pulse power supply 1 being E0 and the duty cycle being D0, increasing the pulse voltage of the pulse power supply 1 to E1; if the concentrations of NO and NO2 in the gas analysis results are zero, but the concentration of N2O increases, then continuing to increase the pulse voltage of the pulse power supply 1 to E2, until, with the increase of the pulse voltage of the pulse power supply 1, the concentration of N2O no longer increases when the concentrations of NO and NO2 are zero, and obtaining the pulse voltage E of the pulse power supply 1 at this time. i and duty cycle D i .
[0061] This also includes: if the concentrations of NO and NO2 in the gas analysis results are not zero, then reduce the duty cycle based on D0 until the concentrations of NO and NO2 are zero, and obtain the duty cycle D1 at this time. Then, based on the pulse voltage of pulse power supply 1 being E1 and the duty cycle being D1, increase the pulse voltage of pulse power supply 1 to E2, until as the pulse voltage of pulse power supply 1 increases, the concentrations of NO and NO2 in the gas analysis results are zero, and the concentration of N2O no longer increases, and obtain the pulse voltage E of pulse power supply 1 at this time. i and duty cycle D i By coordinating the pulse voltage and duty cycle of the pulse power supply 1, effective control of the byproducts NO and NO2 can be achieved.
[0062] It also includes: the pulse frequency of the pulse power supply 1 is f0 and the duty cycle is D. i Based on this, the pulse voltage is increased. If the concentration of acetone gas decreases as the pulse voltage increases, the pulse voltage is further increased until the concentration of acetone gas no longer changes with increasing pulse voltage, at which point the current pulse voltage is maintained. By coordinating the pulse voltage and duty cycle of the pulse power supply 1, and further adjusting the pulse voltage, the pre-degradation of acetone gas can be achieved while effectively controlling the byproducts NO and NO2. This allows for the complete degradation of acetone gas under the action of the secondary gas discharge device 4, as shown in step S5.
[0063] Specifically, primary discharge energy injection optimization: Under a pulse voltage of 10kV, the pulse frequency is adjusted. When the pulse frequency f0 is 7.3kHz, the discharge power P... i The maximum value is reached; acetone gas with a set flow rate and concentration is supplied using the gas supply module 8, and the pulse power supply 1 is turned on. Under the condition of a 50% duty cycle, the pulse voltage of the pulse power supply 1 is increased until gas discharge is induced. The exhaust gas analysis module 9 is used to analyze the gas composition of the gas discharge state under different voltage conditions, specifically as follows: Figure 3 As shown: Under the condition of a pulse power supply frequency of 7.3kHz and a pulse voltage of 8-13kV, NOx in the gas composition is mainly composed of N2O and a small amount of NO and NO2. As the pulse voltage is further increased to 16kV, NO and NO2 show an exponential growth state, while N2O maintains a slow growth trend. That is, under the condition of 13kV, the duty cycle is gradually reduced and the change of NOx in the gas composition is continuously detected until there is no NO and NO2 in the exhaust gas composition. The duty cycle at this time is marked as 30%.
[0064] With a duty cycle of 30%, the voltage of pulse power supply 1 is further increased to 14kV, and the changes in NOx composition in the gas are detected. At the same time, the trend of N2O concentration in the tail gas is detected: there is no NO or NO2 in the gas composition, and the voltage of pulse power supply 1 is further increased to 15kV; a small amount of NO and NO2 begins to appear in the gas composition, so D0 is further reduced, and the changes in NOx composition in the gas discharge tail gas are continuously detected until there is no NO or NO2 in the tail gas composition. At this time, the duty cycle is 25%, and the voltage of pulse power supply 1 is further increased to 16kV.
[0065] During the process of increasing the voltage of pulse power supply 1 to 16kV, the changes in NOx composition in the exhaust gas were continuously monitored, and the trend of N2O concentration in the exhaust gas was also monitored: if there was no NO or NO2 in the gas composition, the voltage of pulse power supply 1 was increased to 17kV; if a small amount of NO and NO2 began to appear in the gas composition, D1 was further reduced, and the changes in NOx composition in the gas discharge exhaust gas were continuously monitored until there was no NO or NO2 in the exhaust gas composition and the N2O concentration was 21ppm, at which point the duty cycle was 23%. The voltage of pulse power supply 1 was increased to 19kV, and there was no NO or NO2 in the exhaust gas composition and the N2O concentration was 34ppm. Subsequently, the voltage of pulse power supply 1 was increased to 20kV, and there was no NO or NO2 in the exhaust gas composition and the N2O concentration was 34ppm. During the process of increasing the pulse voltage from 8kV to 19kV, the concentration of acetone gradually decreased; during the process of increasing the voltage from 19kV to 20kV, the concentration of acetone did not change significantly and remained at 32ppm. At this point, a duty cycle of 23% under 20kV conditions is the operating condition for the primary gas discharge device 2.
[0066] In the multi-stage discharge treatment method for acetone and its byproducts described in this invention, preferably, in step S5, the secondary gas discharge device 4, under the action of its secondary AC power supply 3, completely degrades the gas to be treated in the primary treatment gas, specifically including:
[0067] Based on the initial discharge voltage, the frequency of the secondary AC power supply 3 is adjusted to obtain the AC frequency f. j With discharge power P j The changing pattern between them, and obtain P j Reaching the maximum value P max The AC frequency is f1, and then the AC voltage of the secondary AC power supply 3 is increased. If the ozone concentration decreases with the increase of AC voltage, and there is no NO or NO2 in the primary treated gas, then the AC voltage is increased further. When the AC voltage changes from U... j Increase to U j+1 If NO and / or NO2 begin to appear in the treated gas, the AC voltage remains at U. j The concentration of acetone gas in the treated gas remains unchanged, and it is confirmed that the concentration is greater than zero. If it is greater than zero, at least one AC stage with frequency f1 and AC voltage U is connected in series. j The secondary gas discharge device 4 degrades acetone gas until the acetone gas is completely degraded.
[0068] Specifically, at primary gas discharge f0 = 7.3 kHz, D i Based on 23%, secondary discharge energy injection optimization: Under the condition of AC voltage of 12kV, the AC frequency is adjusted. When the AC frequency f1 is 8.1kHz, the discharge power P j Reaching the maximum value; adjusting the AC voltage under the condition of secondary AC power supply f1 = 8.1kHz, and simultaneously detecting the composition of the exhaust gas of secondary gas discharge device 4:
[0069] like Figure 4 As shown, under the condition of AC voltage of 14.7kV, the gas analysis results fed back by the exhaust gas analysis module 9 to the secondary gas discharge device 4 show that the ozone concentration is 403ppm, the N2O concentration is 53ppm, the acetone concentration is 27ppm, and there is no NO or NO2.
[0070] When the AC voltage is 15.6kV, the gas analysis results fed back from the exhaust gas analysis module 9 to the secondary gas discharge device 4 show that the ozone concentration is 524ppm, the N2O concentration is 97ppm, the acetone concentration is 18ppm, and there is no NO or NO2.
[0071] When the AC voltage is 16.1kV, the gas analysis results fed back from the exhaust gas analysis module 9 to the secondary gas discharge device 4 show that the ozone concentration is 361ppm, the N2O concentration is 103ppm, the acetone concentration is 8ppm, and there is no NO or NO2.
[0072] When the AC voltage is 16.5kV, the gas analysis results fed back from the exhaust gas analysis module 9 to the secondary gas discharge device 4 show that the ozone concentration is 251ppm, the N2O concentration is 107ppm, the acetone concentration is 0ppm, and there is no NO or NO2.
[0073] If the AC voltage is further increased, NO2 will begin to appear; at this time, the operating parameters of the secondary gas discharge device 4 are f1 = 8.1 kHz, U j =16.5kV, which is the operating condition for the secondary gas discharge device 4. If the concentration of acetone gas remains greater than zero as the AC voltage increases, then at least one additional AC frequency of f1 and AC voltage of U is added. j The secondary gas discharge device 4 degrades acetone gas until the acetone gas is completely degraded.
[0074] In the multi-stage discharge treatment method for acetone and its byproducts described in this invention, preferably, it further includes: step S6, whereby the auxiliary gas module 7 supplies a gas with a set composition and concentration to the final-stage gas discharge device 6, and the final-stage gas discharge device 6, under the action of its final-stage AC power supply 5 and the auxiliary gas module 7, adjusts the concentration of the primary treated gas after the gas to be treated has been completely degraded by the secondary gas discharge device 4 and removes ozone, wherein the set composition is N2 and O2.
[0075] Specifically, adjusting the concentration of the primary treated gas and removing ozone after the secondary gas discharge device 4 has completely degraded the gas to be treated includes:
[0076] The AC frequency of the final stage AC power supply 5 is f1, and the AC voltage is U. j The concentrations of N2O (C0) and O3 in the gas are obtained. Then, N2 and O2 with a set N:O ratio are supplied to the final gas discharge device 6. If C1 < C0, the N:O ratio of N2 and O2 is increased until the concentration of N2O (C0) is reached. i It no longer decreases with increasing N:O ratio of N2 and O2; if C1 > C0, then decrease the N:O ratio of N2 and O2 until the concentration of N2O C i It no longer decreases as the N:O ratio of N2 and O2 decreases; finally, at an AC voltage of U... jThe voltage is increased further until the O3 concentration drops to zero. This, combined with the auxiliary gas module 7 and the final gas discharge device 6, effectively removes N2O and O3 from the gas, thereby achieving effective degradation of acetone gas while avoiding the generation of byproducts.
[0077] More specifically, such as Figure 5 As shown, at primary gas discharge f0 = 7.3 kHz, D i Based on 23%, the secondary gas discharge f1 = 8.1 kHz, U j Based on a voltage of 16.5kV, the operating parameters of the final-stage gas discharge device 6 are adjusted to be the same as those of the secondary-stage gas discharge device 4. At this point, the N2O concentration is 125ppm and the O3 concentration is 235ppm. The N:O ratio of N2 and O2 supplied by the auxiliary gas module 7 to the final-stage gas discharge device 6 is further adjusted. Simultaneously, based on the variation pattern of N2O concentration in the gas analysis results fed back by the tail gas analysis module 9, the N2O concentration in the gas of the final-stage gas discharge device 6 is made to be 0. At this point, the N:O ratio of N2 and O2 is approximately 1:4, and the O3 concentration is 785ppm. The final-stage AC voltage is further increased, and under the condition that the final-stage AC voltage is 19.5kV, the O3 concentration drops to 0ppm.
[0078] A third aspect of the present invention provides an electronic device including at least one processor, at least one memory, and a communication interface; the processor, the memory, and the communication interface communicate with each other; the memory stores program instructions executable by the processor, and the processor invokes the program instructions to perform the above-described method for multi-stage discharge treatment of acetone and its byproducts.
[0079] A fourth aspect of the present invention provides a machine-readable storage medium storing instructions that enable the machine-readable storage medium to perform the above-described method for multi-stage discharge treatment of acetone and its byproducts.
[0080] The present invention will be described in detail below through embodiments, but the scope of protection of the present invention is not limited thereto.
[0081] Example 1
[0082] Adopting such Figure 1-2 The system shown is implemented for multi-stage discharge treatment of acetone and its byproducts to degrade acetone gas and avoid the generation of byproducts. Specifically, the system includes a primary gas discharge device 2, at least one secondary gas discharge device 4, a gas supply module 8, and a tail gas analysis module 9.
[0083] The gas supply module 8 is used to supply the gas to be treated into the primary gas discharge device 2. The primary gas discharge device 2 discharges the gas to be treated that enters it under the action of its pulse power supply 1. The exhaust gas analysis module 9 is used to analyze the gas composition and concentration after discharge and feed back the gas analysis results to the pulse power supply 1. The pulse power supply 1 is used to remove NOx from the gas and pre-degrade the gas to be treated through the primary gas discharge device 2 according to the gas analysis results to obtain primary treated gas. The secondary gas discharge device 4 is used to completely degrade the gas to be treated in the primary treated gas under the action of its secondary AC power supply 3. It also includes a final gas discharge device 6 and an auxiliary gas module 7 for supplying the gas with set composition and concentration into the final gas discharge device 6. The final gas discharge device 6 is used to adjust the concentration of the primary treated gas after the gas to be treated has been completely degraded by the secondary gas discharge device 4 and remove ozone under the action of its final AC power supply 5 and the auxiliary gas module 7.
[0084] The pulse power supply 1, the secondary AC power supply 3, and the final AC power supply 5 all include parameter regulators, wherein the regulating parameters include frequency, voltage, duty cycle, rising edge, and falling edge; the gas supply module 8 includes an acetone mass flow controller for controlling the concentration of acetone gas; the auxiliary gas module 7 includes an N2 mass flow controller and an O2 mass flow controller for controlling the concentrations of N2 and O2 respectively to obtain a set N:O ratio gas; the primary gas discharge device 2, the secondary gas discharge device 4, and the final gas discharge device 6 all include a high-voltage electrode 10, a low-voltage electrode 12, and an outer insulating dielectric layer 11. The low-voltage electrode 12 and the high-voltage electrode 10 are coaxially arranged inside the outer insulating dielectric layer 11. The outer surface of the high-voltage electrode 10 is covered with an inner insulating dielectric layer 13. A set distance of 1 mm is maintained between the high-voltage electrode 10 and the low-voltage electrode 12.
[0085] In practical applications, primary discharge energy injection optimization is achieved as follows: Under a pulse voltage of 10kV, the pulse frequency is adjusted. When the pulse frequency f0 is 7.3kHz, the discharge power P... iThe maximum value is reached; the flow rate and concentration of acetone gas supplied by the gas supply module 8 are 200 sccm and 100 ppm, respectively. The pulse power supply 1 is turned on. Under the condition of a duty cycle of 50%, the pulse voltage of the pulse power supply 1 is increased until gas discharge is induced. The gas composition of the gas discharge state under different voltage conditions is analyzed by the tail gas analysis module 9. Under the condition of a pulse power supply frequency of 7.3 kHz and a pulse voltage of 8-13 kV, the NOx in the gas composition is mainly composed of N2O and a small amount of NO and NO2. As the pulse voltage is further increased to 16 kV, NO and NO2 show an exponential growth state, while N2O maintains a slow growth trend. That is, under the condition of 13 kV, the duty cycle is gradually reduced and the change of NOx in the gas composition is continuously detected until there is no NO and NO2 in the tail gas composition. The duty cycle at this time is marked as 30%.
[0086] With a duty cycle of 30%, the pulse voltage of pulse power supply 1 is further increased to 14kV, and the changes in NOx composition in the gas are detected. At the same time, the trend of N2O concentration in the tail gas is detected: there is no NO or NO2 in the gas composition, and the pulse voltage of pulse power supply 1 is further increased to 15kV; a small amount of NO and NO2 begins to appear in the gas composition, so D0 is further reduced, and the changes in NOx composition in the gas discharge tail gas are continuously detected until there is no NO or NO2 in the tail gas composition. At this time, the duty cycle is 25%, and the pulse voltage of pulse power supply 1 is further increased to 16kV.
[0087] During the process of increasing the pulse voltage of pulse power supply 1 to 16kV, the change of NOx component in the exhaust gas is continuously detected, and the trend of N2O concentration in the exhaust gas is also detected: if there is no NO and NO2 in the gas component, the pulse voltage of pulse power supply 1 is increased to 17kV; if a small amount of NO and NO2 begins to appear in the gas component, D1 is further reduced, and the change of NOx component in the gas discharge exhaust gas is continuously detected until there is no NO and NO2 in the exhaust gas component and the N2O concentration is 21ppm. At this time, the duty cycle is 23%. The pulse voltage of pulse power supply 1 is increased to 19kV, the exhaust gas component has no NO and NO2, and the N2O concentration is 34ppm. Subsequently, the pulse voltage of pulse power supply 1 is increased to 20kV, the exhaust gas component has no NO and NO2, and the N2O concentration is 34ppm.
[0088] As the pulse voltage increases from 8kV to 19kV, the concentration of acetone gradually decreases; as it increases from 19kV to 20kV, the concentration of acetone does not change significantly and remains at 32ppm. At this point, the duty cycle of 23% under the 20kV condition is the operating condition for the primary gas discharge device 2.
[0089] At primary gas discharge f0 = 7.3 kHz, D iBased on 23%, secondary discharge energy injection optimization: Under the condition of AC voltage of 12kV, the AC frequency is adjusted. When the AC frequency f1 is 8.1kHz, the discharge power P j Reaching the maximum value; adjusting the AC voltage under the condition of secondary AC power supply f1 = 8.1kHz, and simultaneously detecting the composition of the exhaust gas of secondary gas discharge device 4:
[0090] When the AC voltage is 14.7kV, the gas analysis results fed back from the exhaust gas analysis module 9 to the secondary gas discharge device 4 show that the ozone concentration is 403ppm, the N2O concentration is 53ppm, the acetone concentration is 27ppm, and there is no NO or NO2.
[0091] When the AC voltage is 15.6kV, the gas analysis results fed back from the exhaust gas analysis module 9 to the secondary gas discharge device 4 show that the ozone concentration is 524ppm, the N2O concentration is 97ppm, the acetone concentration is 18ppm, and there is no NO or NO2.
[0092] When the AC voltage is 16.1kV, the gas analysis results fed back from the exhaust gas analysis module 9 to the secondary gas discharge device 4 show that the ozone concentration is 361ppm, the N2O concentration is 103ppm, the acetone concentration is 8ppm, and there is no NO or NO2.
[0093] When the AC voltage is 16.5kV, the gas analysis results fed back from the exhaust gas analysis module 9 to the secondary gas discharge device 4 show that the ozone concentration is 251ppm, the N2O concentration is 107ppm, the acetone concentration is 0ppm, and there is no NO or NO2.
[0094] If the AC voltage is further increased, NO2 will begin to appear; at this time, the operating parameters of the secondary gas discharge device 4 are f1 = 8.1 kHz, U j =16.5kV, which is the operating condition for the secondary gas discharge device 4.
[0095] Specifically, at primary gas discharge f0 = 7.3 kHz, D i Based on 23%, the secondary gas discharge f1 = 8.1 kHz, U jBased on a voltage of 16.5kV, the operating parameters of the final-stage gas discharge device 6 are adjusted to be the same as those of the secondary-stage gas discharge device 4. At this point, the N2O concentration is 125ppm and the O3 concentration is 235ppm. The N:O ratio of N2 and O2 supplied by the auxiliary gas module 7 to the final-stage gas discharge device 6 is further adjusted. Simultaneously, based on the variation pattern of N2O concentration in the gas analysis results fed back by the tail gas analysis module 9, the N2O concentration in the gas of the final-stage gas discharge device 6 is made to be 0. At this point, the N:O ratio of N2 and O2 is approximately 1:4, and the O3 concentration is 785ppm. The final-stage AC voltage is further increased, and under the condition that the final-stage AC voltage is 19.5kV, the O3 concentration drops to 0ppm.
[0096] Example 2
[0097] The same implementation is carried out as in Example 1, except that the flow rate and concentration of acetone gas delivered by the gas supply module 8 are 200 sccm and 200 ppm, respectively.
[0098] In practical applications, in Example 1, the primary gas discharge f0 = 7.3 kHz, D i Based on 23%, secondary discharge energy injection optimization: Under the condition of AC voltage of 12kV, the AC frequency is adjusted. When the AC frequency f1 is 8.1kHz, the discharge power P j The maximum value is reached; the AC voltage is adjusted under the condition that the secondary AC power supply f1 = 8.1kHz, and the exhaust gas composition of the secondary gas discharge device 4 is detected at the same time: under the condition that the AC voltage is 16.8kV, the gas analysis results fed back to the secondary gas discharge device 4 by the exhaust gas analysis module 9 show that the ozone concentration is 246ppm, the N2O concentration is 102ppm, the acetone concentration is 0ppm, and there is no NO or NO2; if the AC voltage is further increased, NO2 will begin to appear; at this time, the operating parameters of the secondary discharge device are f1 = 8.1kHz, U j =21kV. At primary gas discharge f0 = 7.3kHz, D i Based on 23%, the secondary gas discharge f1 = 8.1 kHz, U jBased on a voltage of 16.8kV, the operating parameters of the final-stage gas discharge device 6 are adjusted to be the same as those of the secondary-stage gas discharge device 4. At this point, the N2O concentration is 120ppm and the O3 concentration is 239ppm. The N:O ratio of N2 and O2 supplied by the auxiliary gas module 7 to the final-stage gas discharge device 6 is further adjusted. Simultaneously, based on the variation pattern of N2O concentration in the gas analysis results fed back by the tail gas analysis module 9, the N2O concentration in the gas of the final-stage gas discharge device 6 is made to be 0. At this point, the N:O ratio of N2 and O2 is approximately 1:4, and the O3 concentration is 742ppm. The final-stage AC voltage is further increased, and under the condition that the final-stage AC voltage is 20.2kV, the O3 concentration drops to 0ppm.
[0099] Example 3
[0100] The implementation is similar to Implementation 1, except that the flow rate and concentration of acetone gas delivered by the gas supply module 8 are 300 sccm and 100 ppm, respectively.
[0101] In practical applications, in Example 1, the primary gas discharge f0 = 7.3 kHz, D i Based on 23%, secondary discharge energy injection optimization: Under the condition of AC voltage of 12kV, the AC frequency is adjusted. When the AC frequency f1 is 8.1kHz, the discharge power P j The maximum value is reached; the AC voltage is adjusted under the condition that the secondary AC power supply f1 = 8.1kHz, and the exhaust gas composition of the secondary gas discharge device 4 is detected simultaneously: under the condition that the AC voltage is 16.7kV, the gas analysis results fed back to the secondary gas discharge device 4 by the exhaust gas analysis module 9 show that the ozone concentration is 294ppm, the N2O concentration is 124ppm, the acetone concentration is 32ppm, and there is no NO or NO2; if the AC voltage is further increased, NO2 will begin to appear; at this time, the operating parameters of the secondary discharge device are f1 = 8.1kHz, U j =16.7kV. To further achieve efficient acetone treatment, a secondary gas discharge device 4 needs to be added; and a first-stage operating parameter f1 = 8.1kHz needs to be added, U j After the secondary gas discharge device 4 with a voltage of 16.7kV, the concentration of acetone gas in the exhaust gas is 9ppm. Then, by adding one more stage of operating parameters f1 = 8.1kHz, U... j After the secondary gas discharge device 4 with a voltage of 16.7kV, the concentration of acetone gas in the exhaust gas is 0ppm, meaning that the three-stage secondary gas discharge device 4 connected in series achieves complete degradation of acetone gas. At the primary gas discharge f0 = 7.3kHz, D... i Based on 23%, the secondary gas discharge of the three-stage series connection is f1 = 8.1 kHz, U jBased on a voltage of 16.7kV, the operating parameters of the final-stage gas discharge device 6 are adjusted to be the same as those of the secondary-stage gas discharge device 4. At this point, the N2O concentration is 134ppm and the O3 concentration is 283ppm. The N:O ratio of N2 and O2 supplied by the auxiliary gas module 7 to the final-stage gas discharge device 6 is further adjusted. Simultaneously, based on the variation pattern of N2O concentration in the gas analysis results fed back by the tail gas analysis module 9, the N2O concentration in the gas of the final-stage gas discharge device 6 is made to be 0. At this point, the N:O ratio of N2 and O2 is approximately 1:4, and the O3 concentration is 894ppm. The final-stage AC voltage is further increased, and under the condition that the final-stage AC voltage is 21.7kV, the O3 concentration drops to 0ppm.
[0102] The system, method, electronic device, and machine-readable storage medium for multi-stage discharge treatment of acetone and its byproducts provided by this invention, through the combined use of a primary gas discharge device and at least one secondary gas discharge device, can achieve efficient removal of acetone gas and effectively avoid the generation of byproducts NO and NO2 in practical applications. By further setting the final gas discharge device to adjust the concentration of the primary treated gas after the gas to be treated has been completely degraded by the secondary gas discharge device and remove ozone under the action of its final AC power supply and the auxiliary gas module, the generation of byproducts N2O and ozone can be further effectively avoided without additional technical investment and additional costs. It has the technical advantages of high efficiency and economy, no secondary pollution, and economic advantages of no secondary treatment costs.
[0103] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.
Claims
1. A system for multi-stage discharge treatment of acetone and its byproducts, characterized in that, The system includes a primary gas discharge device (2), at least one secondary gas discharge device (4), a gas supply module (8), and a tail gas analysis module (9); The gas supply module (8) is used to supply the gas to be treated into the primary gas discharge device (2). The primary gas discharge device (2) discharges the gas to be treated that enters it under the action of its pulse power supply (1). The tail gas analysis module (9) is used to analyze the gas composition and concentration after discharge and feed back the gas analysis results to the pulse power supply (1). The pulse power supply (1) is used to remove NOx from the gas and pre-degrade the gas to be treated through the primary gas discharge device (2) according to the gas analysis results to obtain primary treated gas. The secondary gas discharge device (4) is used to completely degrade the gas to be treated in the primary treated gas under the action of its secondary AC power supply (3).
2. The system for multi-stage discharge treatment of acetone and its byproducts according to claim 1, characterized in that, It also includes a final gas discharge device (6) and an auxiliary gas module (7) for supplying a set component and concentration of gas into the final gas discharge device (6). The final gas discharge device (6) is used to adjust the concentration of the primary treated gas after the gas to be treated has been completely degraded by the secondary gas discharge device (4) and remove ozone under the action of its final AC power supply (5) and the auxiliary gas module (7).
3. The system for multi-stage discharge treatment of acetone and its byproducts according to claim 2, characterized in that, The pulse power supply (1), the secondary AC power supply (3), and the final AC power supply (5) all include parameter regulators, wherein the regulating parameters include frequency, voltage, duty cycle, rising edge, and falling edge.
4. The system for multi-stage discharge treatment of acetone and its byproducts according to claim 2, characterized in that, The gas supply module (8) includes an acetone mass flow controller for controlling the concentration of acetone gas; the auxiliary gas module (7) includes an N2 mass flow controller and an O2 mass flow controller for controlling the concentrations of N2 and O2 respectively, to obtain a set N:O ratio gas.
5. The system for multi-stage discharge treatment of acetone and its byproducts according to any one of claims 2-4, characterized in that, The primary gas discharge device (2), the secondary gas discharge device (4), and the final gas discharge device (6) all include a high-voltage electrode (10), a low-voltage electrode (12), and an outer insulating dielectric layer (11). The low-voltage electrode (12) and the high-voltage electrode (10) are coaxially arranged inside the outer insulating dielectric layer (11). The outer surface of the high-voltage electrode (10) is covered with an inner insulating dielectric layer (13). A set distance is maintained between the high-voltage electrode (10) and the low-voltage electrode (12).
6. A method for multi-stage discharge treatment of acetone and its byproducts, characterized in that, Applied to the system according to any one of claims 1-5, the method comprises the following steps: S1. The gas supply module (8) delivers the gas to be processed to the primary gas discharge device (2); S2, the primary gas discharge device (2) discharges the gas to be processed that enters it under the action of its pulse power supply (1); S3. The exhaust gas analysis module (9) analyzes the gas composition and concentration after discharge and feeds back the gas analysis results to the pulse power supply (1). S4. The pulse power supply (1) removes NOx from the gas and pre-degrades the gas to be treated by the primary gas discharge device (2) according to the gas analysis results, so as to obtain primary treated gas. S5. The secondary gas discharge device (4) completely degrades the gas to be treated in the primary gas under the action of its secondary AC power supply (3).
7. The method for multi-stage discharge treatment of acetone and its byproducts according to claim 6, characterized in that, In step S4, the pulse power supply (1) removes NOx from the gas and pre-degrades the gas to be treated using the primary gas discharge device (2) based on the gas analysis results. Specifically, this includes: Based on the initial discharge voltage, the frequency of the pulse power supply (1) is adjusted to obtain the pulse frequency f. i With discharge power P i The changing pattern between them, and obtain P i Reaching the maximum value P max The pulse frequency f0 is determined, and then the gas analysis results are obtained based on the pulse voltage of the pulse power supply (1) increasing from the initial value to the maximum value. The pulse voltage E0 is obtained when the concentrations of NO and NO2 increase exponentially as the pulse voltage of the pulse power supply (1) increases. Then, the duty cycle of the pulse power supply (1) is reduced based on the pulse voltage E0 until the concentrations of NO and NO2 in the gas analysis results are zero, and the duty cycle D0 is obtained at this time.
8. The method for multi-stage discharge treatment of acetone and its byproducts according to claim 7, characterized in that, In step S4, the pulse power supply (1) removes NOx from the gas and pre-degrades the gas to be treated using the primary gas discharge device (2) based on the gas analysis results. Specifically, it also includes: Based on the pulse voltage of the pulse power supply (1) being E0 and the duty cycle being D0, the pulse voltage of the pulse power supply (1) is increased to E1. If the concentrations of NO and NO2 in the gas analysis results are zero and the concentration of N2O increases, the pulse voltage of the pulse power supply (1) is further increased to E2 until, with the increase of the pulse voltage of the pulse power supply (1), the concentration of N2O no longer increases when the concentrations of NO and NO2 are zero. The pulse voltage E of the pulse power supply (1) at this time is then obtained. i and duty cycle D i .
9. The method for multi-stage discharge treatment of acetone and its byproducts according to claim 8, characterized in that, In step S4, the pulse power supply (1) removes NOx from the gas and pre-degrades the gas to be treated using the primary gas discharge device (2) based on the gas analysis results. Specifically, it also includes: If the concentrations of NO and NO2 in the gas analysis results are not zero, then reduce the duty cycle based on D0 until the concentrations of NO and NO2 are zero, and obtain the duty cycle D1 at this time. Then, based on the pulse voltage of the pulse power supply (1) being E1 and the duty cycle being D1, increase the pulse voltage of the pulse power supply (1) to E2, until the concentrations of NO and NO2 in the gas analysis results are zero as the pulse voltage of the pulse power supply (1) increases, and the concentration of N2O no longer increases. Obtain the pulse voltage E of the pulse power supply (1) at this time. i and duty cycle D i .
10. The method for multi-stage discharge treatment of acetone and its byproducts according to claim 9, characterized in that, In step S4, the pulse power supply (1) removes NOx from the gas and pre-degrades the gas to be treated using the primary gas discharge device (2) based on the gas analysis results. Specifically, it also includes: The pulse frequency of the pulse power supply (1) is f0 and the duty cycle is D. i Based on this, increase the pulse voltage. If the concentration of acetone gas decreases as the pulse voltage increases, continue to increase the pulse voltage until the concentration of acetone gas no longer changes as the pulse voltage increases. Then keep the current pulse voltage unchanged.
11. The method for multi-stage discharge treatment of acetone and its byproducts according to claim 10, characterized in that, In step S5, the secondary gas discharge device (4), under the action of its secondary AC power supply (3), completely degrades the gas to be treated in the primary treated gas, specifically including: Based on the initial discharge voltage, adjust the frequency of the secondary AC power supply (3) to obtain the AC frequency f. j With discharge power P j The changing pattern between them, and obtain P j Reaching the maximum value P max The AC frequency f1 is then increased, followed by increasing the AC voltage of the secondary AC power supply (3). If the ozone concentration decreases with increasing AC voltage, and there is no NO or NO2 in the primary treated gas, the AC voltage is further increased. When the AC voltage changes from U... j Increase to U j+1 If NO and / or NO2 begin to appear in the treated gas, the AC voltage remains at U. j The concentration of acetone gas in the treated gas remains unchanged, and it is confirmed that the concentration is greater than zero. If it is greater than zero, at least one AC stage with frequency f1 and AC voltage U is connected in series. j The secondary gas discharge device (4) degrades acetone gas until the acetone gas is completely degraded.
12. The method for multi-stage discharge treatment of acetone and its byproducts according to claim 11, characterized in that, It also includes: step S6, where the auxiliary gas module (7) delivers a gas with a set composition and concentration into the final gas discharge device (6), and the final gas discharge device (6) adjusts the concentration of the primary gas after the gas to be treated has been completely degraded by the secondary gas discharge device (4) and removes ozone under the action of its final AC power supply (5) and the auxiliary gas module (7), wherein the set composition is N2 and O2.
13. The method for multi-stage discharge treatment of acetone and its byproducts according to claim 12, characterized in that, The adjustment of the concentration of the primary treated gas after the gas to be treated has been completely degraded by the secondary gas discharge device (4) and the removal of ozone specifically include: The AC frequency of the final stage AC power supply (5) is f1, and the AC voltage is U. j The concentrations of N2O (C0) and O3 in the gas are obtained. Then, N2 and O2 with a set N:O ratio are supplied to the final gas discharge device (6). If C1 < C0, the N:O ratio of N2 and O2 is increased until the concentration of N2O (C0) is reached. i It no longer decreases with increasing N:O ratio of N2 and O2; if C1 > C0, then decrease the N:O ratio of N2 and O2 until the concentration of N2O C i It no longer decreases as the N:O ratio of N2 and O2 decreases; finally, at an AC voltage of U... j Continue increasing the voltage until the O3 concentration drops to zero.
14. An electronic device, characterized in that, It includes at least one processor, at least one memory, and a communication interface; the processor, the memory, and the communication interface communicate with each other; the memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to perform the method for multi-stage discharge treatment of acetone and its byproducts as described in any one of claims 6-13.
15. A machine-readable storage medium, characterized in that, The machine-readable storage medium stores instructions that enable the machine-readable storage medium to perform the method for multi-stage discharge treatment of acetone and its byproducts as described in any one of claims 6-13.