VOCs waste gas collection method based on one-loading two-dissolution technology

Abstract

The invention discloses a VOCs waste gas collection method based on a one-loading two-dissolution technology, and relates to the technical field of VOCs waste gas collection. The method comprises the following steps: S1, selecting two solvents with different properties, and selecting two solvents with better complementarity in order to effectively collect different types of volatile organic compounds; the two solvents should differ in physical and chemical properties so as to be able to cover a wider range of compounds. A common method for collecting two VOCs-containing waste gases with different temperatures and concentrations is to construct two sets of waste gas treatment devices for respectively treating the VOCs-containing waste gases with different properties. In this way, more equipment investment is needed, the air volume of the treated VOCs-containing waste gas is large, and the operation cost of treatment equipment is high. The initiative of treating the VOCs-containing waste gas by an emission unit is reduced, so that a certain environmental protection problem is caused.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of VOCs waste gas collection, and particularly relates to a VOCs waste gas collection method based on one-carrying-two-dissolving technology. BACKGROUND

[0002] Under the current double carbon and air pollution control policy requirements, if the existing mode is used in a production system with the characteristics of a coating-drying production system, the VOCs-containing gas volatilization involved has two scenes forming waste gas respectively treated and meeting the emission standard requirements. Generally, two sets of treatment devices need to be invested, and the operation cost of the two sets of treatment devices needs to be borne, and the energy consumption is also increased. The profit ability of the emission unit is reduced, the full operation of the environmental protection equipment is affected, and the corresponding environmental protection problem of emission is caused.

[0003] In the production system with the characteristics of a coating-drying production system, the VOCs-containing gas volatilization involved has two scenes. One is volatilization in an open space. The waste gas containing VOCs in this part has the characteristics of normal temperature and low VOCs concentration, generally less than 1 g / m3, and is not easy to be directly treated or has high treatment cost. The other is volatilization in an oven. The waste gas containing VOCs in this part has the characteristics of temperature close to the oven temperature and high VOCs concentration, and is easy to be directly treated and has low treatment cost. SUMMARY

[0004] The purpose of the application is to provide a VOCs waste gas collection method based on one-carrying-two-dissolving technology, which solves the existing problems.

[0005] To solve the above technical problems, the application is realized by the following technical scheme: The application is a VOCs waste gas collection method based on one-carrying-two-dissolving technology, comprising the following steps: S1: selecting two solvents with different properties, in order to effectively collect different types of volatile organic compounds, two solvents with good complementarity are selected. The two solvents should be different in physical and chemical properties so as to cover a wider range of compounds; S2: Design a collection system, including a gas sampling device, a solvent recovery unit, and other necessary control equipment. Ensure the system can operate stably in a real industrial environment. The system consists of two steps: a coating process at room temperature, which, given current policies requiring strict treatment of VOCs-containing waste gas, is typically conducted in a sealed space. A fan collects the VOCs-containing waste gas from this sealed space and sends it to the treatment equipment; and a drying oven where most of the volatile components in the VOCs-containing material evaporate, causing the liquid material to form a solid coating. The waste gas generated from the VOCs evaporation in the drying oven also needs to be treated using a fan. S3: Selection of sampling points: Based on the characteristics of the waste gas generated in the industrial process, select appropriate sampling points to analyze the composition and concentration of the waste gas in order to adjust the type and amount of solvent used. S4: Optimize operating conditions. For different volatile organic compounds, it may be necessary to adjust operating conditions such as solvent type, temperature, and pressure. Optimizing these parameters can improve the efficiency of waste gas collection. S5: Monitoring and analysis, including real-time monitoring and sampling throughout the collection process. This includes monitoring the concentration of compounds in exhaust gases and solvents, and conducting subsequent analysis. S6: Solvent recovery involves recycling collected solvents containing volatile organic compounds for reuse. This helps reduce costs and environmental impact. S7: Comply with regulations. When designing and operating the exhaust gas collection system, it is essential to comply with local and national environmental regulations. Ensure that the system's design and operation meet relevant standards.

[0006] Furthermore, S1 is further represented as: S1.1: Selection of Polar and Non-polar Solvents. Choose one polar solvent and one non-polar solvent to cover a variety of volatile organic compounds. Some compounds tend to dissolve more readily in polar solvents, while others are better suited to non-polar solvents. S1.2: Adjusting for differences in polarity indices, using polarity indices to assess solvent polarity. Select two solvents with high and low polarity indices to ensure coverage of a wide range of compounds. Differences in polarity indices can affect the interactions between the solvent and volatile organic compounds; S1.3: Adjustment of boiling point and volatility: Selecting two solvents with different boiling points helps to flexibly control the temperature during collection. Solvents with lower boiling points may be more suitable for collecting volatile organic compounds at high temperatures, while solvents with higher boiling points can be used for collection under lower temperature conditions. S1.4: Control of chemical stability, ensure that the two selected solvents are relatively stable under the conditions of waste gas collection, and are not prone to reaction or degradation. This helps to improve the accuracy and repeatability of the collection; S1.5: Control of toxicity and environmental friendliness, consider the toxicity and environmental friendliness of the solvent. Choose solvents that have less impact on the human body and the environment, to ensure that the waste gas collection process is safe and meets environmental standards; S1.6: Solubility range, ensure that the solubility range of the two solvents is complementary, so as to effectively dissolve and collect volatile organic compounds of different concentrations and types.

[0007] Further, the S2 is further represented as: S2.1: Gas sampling system: 1. Sampling point selection: According to the source and composition distribution of waste gas, select appropriate sampling points. Ensure that the location of the sampling point can represent the characteristics of the waste gas source; 2. Sampling device: Use appropriate gas sampling devices, such as sampling tubes or gas bags, to ensure that waste gas samples can be accurately and quickly collected; S2.2: Solvent circulation system: 1. Select the appropriate solvent pump: According to the properties of the solvent and the operation requirements, select the appropriate pump to ensure that the solvent can be stably circulated to the adsorption device.

[0008] 2. Adsorption device design: Design an adsorption device for adsorbing volatile organic compounds, which can use adsorbent beds or other adsorption materials.

[0009] 3. Solvent recovery device: Including solvent condensers, separation devices, etc., for recycling solvents and sending them back to the circulation system to improve efficiency and reduce costs; S2.3: Temperature control system: Temperature control device: Design a temperature control device according to the temperature requirements during the collection process, to ensure that waste gas can be effectively collected under high or low temperature conditions; Heating and cooling system: If necessary, add heating elements and cooling devices to adjust the temperature of the solvent and improve the collection efficiency; S2.4: Monitoring and control system: 1. Real-time monitoring system: Integrate gas analyzers or other real-time monitoring equipment to monitor the concentration of volatile organic compounds in waste gas.

[0010] 2. Data recording and analysis: Establish a data recording system to record monitoring data and perform analysis. This helps to evaluate the performance of the system and make adjustments if necessary.

[0011] 3. Automatic control system: If possible, design an automatic control system to adjust parameters such as solvent circulation rate, temperature, etc. based on real-time monitoring results to achieve optimal collection effect; S2.5: Maintenance and maintenance system: 1. Regular maintenance plan: Develop a regular system maintenance plan, including cleaning, replacing adsorbents, repairing equipment, etc. to ensure the stability and reliability of the system.

[0012] Further, the S3 is further represented as: S3.1: Determine the source of waste gas, determine the main source of waste gas, such as industrial production facilities, exhaust ports, equipment or processing units. When selecting sampling points, ensure that it can represent the entire waste gas source; S3.2: Waste gas composition distribution, if there are different components in the waste gas, the sampling point should be selected to reflect the typical proportion of these components. Different locations may have different waste gas composition distribution, so analysis should be made according to actual situation; S3.3: Air flow analysis, consider the direction and speed of air flow to select a position that can capture a typical sample of waste gas. Generally, sampling points close to the source of waste gas are more likely to obtain representative samples; S3.4: Height and position adjustment, the composition of waste gas may vary with height, so choose the appropriate height for sampling in the vertical direction. In addition, select the horizontal position of the sampling point according to the actual situation to ensure that it can capture the most representative waste gas; S3.5: Environmental conditions, consider environmental conditions such as wind direction, temperature and humidity, etc. These conditions may affect the spread and dilution of waste gas, thereby affecting the selection of sampling points; S3.6: Safety factors, ensure that the selected sampling point is safe and will not pose a danger to operators or equipment.

[0013] Further, the S4 is further represented as: S4.1: Selection of sampling equipment, select appropriate sampling equipment and methods to ensure accurate sampling and analysis of waste gas components, ensure that the sampling equipment can adapt to the chemical properties of waste gas, avoid possible reactions or interference; S4.2: Determination of sampling time, according to the time pattern of waste gas generation, select appropriate sampling time to ensure the capture of waste gas samples under different conditions. If there are seasonal or periodic changes in waste gas emissions, sampling should be considered at different times; S4.3: Control of sampling flow rate, control the sampling flow rate to ensure sufficient sampling volume and avoid sample distortion due to too high or too low flow rate. Ensure that the sampling flow rate matches the waste gas emission rate to obtain reliable data; S4.4: Temperature and humidity control, control temperature and humidity during sampling process to prevent waste gas components from being unstable or reacting during sampling process. Changes in temperature and humidity can affect the physical and chemical properties of waste gas, so they need to be controlled; S4.5: On-site monitoring and adjustment, real-time monitoring during sampling process to ensure that the environmental conditions at the sampling point remain stable. Timely adjustments are made according to monitoring results to adapt to environmental changes and ensure the reliability of sampling data; S4.6: Regular calibration of sampling points, regularly calibrate sampling equipment to ensure its performance is stable and meets standard requirements. Regularly check the location of the sampling point to ensure it can still represent the source of waste gas; S4.7: Data recording and quality control, establish a complete data recording system to ensure traceability and verifiability of sampling data. Implement quality control measures, including the use of standard samples and analysis of quality control samples in the laboratory to ensure the accuracy and reliability of the results.

[0014] Further, the S5 is further represented as: S5.1: Real-time monitoring: (1) Sensor deployment: Deploy chemical sensors at key points that can monitor compounds in waste gas and solvents in real time. The choice of sensors depends on the specific compounds to be monitored, which may involve gas sensors, volatile organic compound (VOC) sensors, etc.

[0015] (2) Data acquisition system: Establish a data acquisition system that can collect data generated by sensors in a timely manner. This can be achieved through automated systems or drones and other technologies.

[0016] (3) Alarm system: Equip with alarm system that can immediately alert when abnormal concentration is detected. This helps to take action in time and reduce potential harm.

[0017] S5.2: Sampling: (1) Active sampling: Collect gas and solvent samples regularly for subsequent laboratory analysis. This can be achieved through air samplers or adsorption tubes and other devices.

[0018] (2) Bag sampling: Use gas sampling bags or solvent sampling bottles to capture gas or solvent samples for subsequent laboratory testing.

[0019] (3) Sample chain: Ensure that the collected samples are kept at appropriate temperature and pressure to prevent compounds from volatilizing or decomposing; S5.3: Subsequent analysis: (1) Laboratory Testing: The collected samples are sent to a laboratory for detailed analysis using precision instruments. This can include techniques such as Gas Chromatography-Mass Spectrometry (GC-MS), High-Performance Liquid Chromatography (HPLC), etc.

[0020] (2) Quantitative Analysis: The concentration of each compound is determined to quantify the level of pollutants. This is crucial for complying with regulations, assessing health risks, and taking appropriate control measures.

[0021] (3) Data Interpretation: The laboratory data is interpreted to identify potential health and environmental risks. The measured results are compared with regulatory standards or industry standards to assess compliance with prescribed standards.

[0022] (4) Report Generation: A detailed monitoring report is generated, including variations during the monitoring period, peak concentrations, possible sources, and recommended improvement measures.

[0023] (5) Trend Analysis: Historical data is analyzed for trends to predict possible future pollution trends and take preventive measures.

[0024] Further, the S6 is further represented as: S6.1: Solvent Collection: (1) Selecting appropriate collection systems: First, ensure that the solvents used in production or processes can be effectively collected. This may involve suitable containers, piping systems, or other equipment.

[0025] (2) Implementing effective collection strategies: Develop effective collection strategies for the work process to minimize solvent waste. This may include suitable equipment design to reduce volatile organic compound (VOC) emissions; S6.2: Solvent Treatment: (1) Preliminary treatment: Preliminary treatment of collected solvents, such as filtration to remove suspended matter, is performed. This helps reduce the burden on subsequent treatment steps.

[0026] (2) Distillation: Use distillation or rectification techniques to separate volatile components from the solvent. This can be done by heating the solvent to volatilize it and then collecting it by condensation.

[0027] (3) Optimization of fractionation operations: Adjust distillation parameters such as temperature and pressure to optimize fractionation operations, ensuring efficient volatile organic compound recovery; S6.3: Analysis and Quality Control: (1) Analysis of recovered solvents: Analyze the recovered solvents to ensure they meet the required quality standards. This can include laboratory tests such as Gas Chromatography-Mass Spectrometry (GC-MS), etc.

[0028] (2) Quality control measures: Implement quality control measures to ensure that the recovered solvent does not cause quality degradation or other adverse effects in use; S6.4: Storage and reuse: (1) Proper storage: Store the recovered solvent in appropriate containers to prevent contamination or evaporation. Ensure that the storage conditions meet safety and environmental standards.

[0029] (2) Reuse: Reintroduce the recovered solvent into the production process, ensuring that its use meets quality and process requirements; S6.5: Performance monitoring and improvement: (1) Performance monitoring: Regularly monitor the performance of the solvent recovery system, including recovery rate, quality, and energy efficiency.

[0030] (2) Process improvement: Based on performance monitoring results, make necessary process improvements to improve the efficiency and sustainability of solvent recovery.

[0031] Further, the S7 is further represented as: S7.1: Environmental impact assessment, before designing the waste gas collection system, a comprehensive environmental impact assessment is conducted to evaluate the potential impact of the system on the surrounding environment; S7.2: Develop operating procedures, develop detailed operating procedures to ensure that the waste gas collection system operates in accordance with design requirements and regulatory requirements; S7.3: Real-time monitoring and reporting, use real-time monitoring equipment to monitor waste gas emissions, as well as system performance, to ensure that regulatory requirements are met at any time.

[0032] The present application has the following beneficial effects: 1、The present application collects two kinds of VOCs-containing waste gas with different temperature and concentration, which is a common practice. This method requires more equipment investment, and the treated VOCs-containing waste gas has a large air volume, which increases the operating cost of the treatment equipment. It reduces the initiative of the emission unit to treat VOCs-containing waste gas, thereby causing certain environmental problems.

[0033] 2、The present application collects VOCs generated in two VOCs volatilization scenarios to form a VOCs waste gas. It objectively reduces the air volume of the waste gas, and only one set of treatment device is needed to meet the environmental protection requirements of emission, thereby reducing equipment investment and operating cost. It can effectively improve the initiative of the emission unit to treat VOCs-containing waste gas.

[0034] 3、The application can absorb the heat of the exhaust gas discharged by the oven or the heat of the flue gas formed by incinerating the VOCs exhaust gas through the heat exchange equipment in the process of conveying the low-concentration VOCs exhaust gas to the oven at room temperature, forming a gas with a higher temperature, which becomes the heating medium of the oven when entering the oven, and can achieve the effect of energy saving and consumption reduction.

[0035] Of course, it is not necessary to achieve all the advantages described above when implementing any product of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed for the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0037] Fig. 1 Flowchart of the present application; Fig. 2 System program block diagram of the present application. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0039] Please refer to Figs. 1-2 The present application is a VOCs exhaust gas collection method based on a two-solvent loading technology, which comprises the following steps: S1: Select two solvents with different properties. In order to effectively collect different types of volatile organic compounds, two solvents with good complementarity are selected. The two solvents should be different in physical and chemical properties in order to cover a wider range of compounds; S2: Designing the collection system, design a collection system, including gas sampling device, solvent recovery unit and other necessary control equipment. Ensure that the system can be stable in the actual industrial environment, the system is divided into two steps, coating (coating) process at room temperature, under the current policy requirements of VOCs-containing waste gas, this process usually requires to be carried out in a sealed space, using the fan to collect VOCs-containing waste gas in the sealed space, and then sent to the treatment equipment; In the oven, most of the volatile components in the VOCs-containing material are volatilized, and the liquid material forms a solid coating. The waste gas volatilized in the oven also needs to be sent to the treatment device using the fan for treatment; S3: Selection of sampling points, according to the characteristics of the waste gas generated in the industrial process, select the appropriate sampling point, analyze the composition and concentration of the waste gas, in order to adjust the type and amount of solvent; S4: Optimization of operating conditions, for different volatile organic compounds, the type of solvent, temperature, pressure and other operating conditions may need to be adjusted. Optimization of these parameters can improve the efficiency of waste gas collection; S5: Monitoring and analysis, real-time monitoring and sampling are carried out during the entire collection process. This includes monitoring the concentration of compounds in waste gas and solvent, and subsequent analysis; S6: Solvent recovery, the collected solvent containing volatile organic compounds is recovered for reuse. This helps to reduce costs and environmental impact; S7: Compliance with regulations, when designing and operating the waste gas collection system, local and national environmental regulations must be followed. Ensure that the design and operation of the system meet the relevant standards.

[0040] S1 is further represented as: S1.1: Selection of polar and non-polar solvents, select a polar solvent and a non-polar solvent to cover a variety of volatile organic compounds. Some compounds are more inclined to dissolve in polar solvents, while others are more suitable for non-polar solvents; S1.2: Adjusting the difference in polarity index, use the polarity index to evaluate the polarity of the solvent. Select two solvents with high and low polarity index to ensure that a wide range of compounds can be covered. The difference in polarity index can affect the interaction between the solvent and the volatile organic compounds; S1.3: Selection of boiling point and evaporation, select two solvents with different boiling points, which helps to flexibly control the temperature during the collection process. Solvents with lower boiling points may be more suitable for collecting volatile organic compounds at high temperatures, while solvents with higher boiling points can be used for collection at lower temperature conditions; S1.4: Control of chemical stability, ensure that the two selected solvents are relatively stable under the conditions of waste gas collection, and are not prone to reaction or degradation. This helps to improve the accuracy and repeatability of the collection; S1.5: Control of toxicity and environmental friendliness, consider the toxicity and environmental friendliness of the solvent. Choose solvents that have less impact on the human body and the environment, to ensure that the waste gas collection process is safe and meets environmental standards; S1.6: Solubility range, ensure that the solubility range of the two solvents is complementary, so as to be able to effectively dissolve and collect volatile organic compounds of different concentrations and types.

[0041]

[0042] S2 is further represented as: S2.1: Gas sampling system: 1. Sampling point selection: According to the source and composition distribution of waste gas, select appropriate sampling points. Ensure that the location of the sampling point can represent the characteristics of the waste gas source; 2. Sampling device: Use appropriate gas sampling devices, such as sampling tubes or gas bags, to ensure that waste gas samples can be accurately and quickly collected; S2.2: Solvent circulation system: 1. Select the appropriate solvent pump: According to the properties of the solvent and the operation requirements, select the appropriate pump to ensure that the solvent can be stably circulated to the adsorption device.

[0043] 2. Adsorption device design: Design an adsorption device for adsorbing volatile organic compounds, which can use adsorbent beds or other adsorption materials.

[0044] 3. Solvent recovery device: Including solvent condensers, separation devices, etc., for recycling solvents and sending them back to the circulation system to improve efficiency and reduce costs; S2.3: Temperature control system: Temperature control device: Design a temperature control device according to the temperature requirements during the collection process, to ensure that waste gas can be effectively collected under high or low temperature conditions; Heating and cooling system: If necessary, add heating elements and cooling devices to adjust the temperature of the solvent and improve the collection efficiency; S2.4: Monitoring and control system: 1. Real-time monitoring system: Integrate gas analyzers or other real-time monitoring equipment to monitor the concentration of volatile organic compounds in waste gas.

[0045] 2. Data recording and analysis: Establish a data recording system to record monitoring data and perform analysis. This helps to evaluate the performance of the system and make adjustments if necessary.

[0046] 3. Automatic control system: If possible, design an automatic control system to adjust parameters such as solvent circulation rate, temperature, etc. based on real-time monitoring results to achieve optimal collection effect; S2.5: Maintenance and maintenance system: 1. Regular maintenance plan: Develop a regular system maintenance plan, including cleaning, replacing adsorbents, repairing equipment, etc. to ensure the stability and reliability of the system.

[0047] S3 further represents: S3.1: Determine the source of waste gas, determine the main source of waste gas, such as industrial production facilities, exhaust ports, equipment or processing units. When selecting sampling points, ensure that it can represent the entire waste gas source; S3.2: Waste gas composition distribution, if there are different components in the waste gas, the sampling point should be selected to reflect the typical proportion of these components. Different locations may have different waste gas composition distribution, so analysis should be carried out according to the actual situation; S3.3: Air flow analysis, consider the direction and speed of air flow to select a location that can capture a typical sample of waste gas. Generally, sampling points close to the source of waste gas are more likely to obtain representative samples; S3.4: Height and position adjustment, the composition of waste gas may vary with height, so select an appropriate height for sampling in the vertical direction. In addition, select the horizontal position of the sampling point according to the actual situation to ensure that it can capture the most representative waste gas; S3.5: Environmental conditions, consider environmental conditions such as wind direction, temperature and humidity, etc. These conditions may affect the spread and dilution of waste gas, thereby affecting the selection of sampling points; S3.6: Safety factors, ensure that the selected sampling point is safe and will not pose a danger to operating personnel or equipment.

[0048]

[0049] S4 further represents: S4.1: Selection of sampling equipment, select appropriate sampling equipment and methods to ensure accurate sampling and analysis of waste gas components, ensure that the sampling equipment can adapt to the chemical properties of waste gas, avoid possible reactions or interference; S4.2: Determination of sampling time, according to the time pattern of waste gas generation, select appropriate sampling time to ensure the capture of waste gas samples under different conditions. If there are seasonal or periodic changes in waste gas emissions, sampling should be considered at different times; S4.3: Control of sampling flow rate, control the sampling flow rate to ensure sufficient sampling volume and avoid sample distortion due to too high or too low flow rate. Ensure that the sampling flow rate matches the waste gas emission rate to obtain reliable data; S4.4: Temperature and humidity control, control temperature and humidity during sampling process to prevent waste gas components from being unstable or reacting during sampling process. Changes in temperature and humidity can affect the physical and chemical properties of waste gas, so they need to be controlled; S4.5: On-site monitoring and adjustment, real-time monitoring during sampling process to ensure that the environmental conditions at the sampling point remain stable. Timely adjustments are made based on monitoring results to adapt to environmental changes and ensure the reliability of sampling data; S4.6: Regular calibration of sampling points, regularly calibrate sampling equipment to ensure its performance is stable and meets standard requirements. Regularly check the location of the sampling point to ensure it can still represent the source of waste gas; S4.7: Data recording and quality control, establish a complete data recording system to ensure traceability and verifiability of sampling data. Implement quality control measures, including the use of standard samples and analysis of quality control samples in the laboratory to ensure the accuracy and reliability of the results.

[0050] S5 is further represented as: S5.1: Real-time monitoring: (1) Sensor deployment: Deploy chemical sensors at key points that can monitor compounds in waste gas and solvents in real time. The choice of sensors depends on the specific compounds that need to be monitored, which may involve gas sensors, volatile organic compound (VOC) sensors, etc.

[0051] (2) Data acquisition system: Establish a data acquisition system that can collect data generated by sensors in a timely manner. This can be achieved through automated systems or drones and other technologies.

[0052] (3) Alarm system: Equip an alarm system that can immediately alert when abnormal concentrations are detected. This helps to take timely action and reduce potential harm.

[0053] S5.2: Sampling: (1) Active sampling: Regularly collect gas and solvent samples for subsequent laboratory analysis. This can be achieved through air samplers or adsorption tubes and other devices.

[0054] (2) Bag sampling: Use gas sampling bags or solvent sampling bottles to capture gas or solvent samples for subsequent laboratory testing.

[0055] (3) Sample chain: Ensure that the collected samples are kept at appropriate temperature and pressure to prevent compounds from volatilizing or decomposing; S5.3: Subsequent analysis: (1) Laboratory Testing: The collected samples are sent to a laboratory for detailed analysis using precision instruments. This can include techniques such as Gas Chromatography-Mass Spectrometry (GC-MS), High-Performance Liquid Chromatography (HPLC), etc.

[0056] (2) Quantitative Analysis: The concentration of each compound is determined to quantify the level of pollutants. This is crucial for complying with regulations, assessing health risks, and taking appropriate control measures.

[0057] (3) Data Interpretation: The laboratory data is interpreted to identify potential health and environmental risks. The measured results are compared with regulatory standards or industry standards to assess compliance with prescribed standards.

[0058] (4) Report Generation: A detailed monitoring report is generated, including variations during the monitoring period, peak concentrations, possible sources, and suggested improvement measures.

[0059] (5) Trend Analysis: Historical data is analyzed for trends to predict possible future pollution trends and take preventive measures.

[0060] S6.1: Solvent Collection: (1) Selecting appropriate collection systems: First, ensure that the solvents used in production or processes can be effectively collected. This may involve suitable containers, piping systems, or other equipment.

[0061] (2) Implementing effective collection strategies: Develop effective collection strategies for the work process to minimize solvent waste. This may include suitable equipment design to reduce the release of volatile organic compounds (VOCs); S6.2: Solvent Treatment: (1) Preliminary treatment: Preliminary treatment of collected solvents, such as filtration to remove suspended matter, is performed. This helps reduce the burden on subsequent treatment steps.

[0062] (2) Distillation: Use distillation or rectification techniques to separate volatile components from the solvent. This can be done by heating the solvent to volatilize it and then collecting it by condensation.

[0063] (3) Optimization of fractionation operations: Adjust distillation parameters such as temperature and pressure to optimize fractionation operations, ensuring efficient volatile organic compound recovery; S6.3: Analysis and Quality Control: (1) Analysis of recovered solvents: Analyze the recovered solvents to ensure they meet the required quality standards. This can include laboratory tests such as Gas Chromatography-Mass Spectrometry (GC-MS), etc.

[0064] (2) Quality control measures: Implement quality control measures to ensure that the recovered solvent does not cause quality degradation or other adverse effects in use; S6.4: Storage and reuse: (1) Proper storage: Store the recovered solvent in appropriate containers to prevent contamination or evaporation. Ensure that the storage conditions meet safety and environmental standards.

[0065] (2) Reuse: Reintroduce the recovered solvent into the production process, ensuring that its use meets quality and process requirements; S6.5: Performance monitoring and improvement: (1) Performance monitoring: Regularly monitor the performance of the solvent recovery system, including recovery rate, quality, and energy efficiency.

[0066] (2) Process improvement: Based on performance monitoring results, make necessary process improvements to improve the efficiency and sustainability of solvent recovery.

[0067] S7 further represents: S7.1: Environmental impact assessment, before designing the waste gas collection system, a comprehensive environmental impact assessment is conducted to evaluate the potential impact of the system on the surrounding environment; S7.2: Develop operating procedures, develop detailed operating procedures to ensure that the waste gas collection system operates in accordance with design requirements and regulatory requirements; S7.3: Real-time monitoring and reporting, use real-time monitoring equipment to monitor waste gas emissions, as well as system performance, to ensure that regulatory requirements are met at any time.

[0068] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0069] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details and limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of the present specification. The present specification selects and describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is limited only by the claims and their entire scope and equivalents.

Claims

1. A method for collecting VOCs exhaust gas based on a two-solvent loading technology, characterized in that: Comprising the following steps: S1: Selection of two solvents of different properties; S2: Design of the collection system; S3: Selection of sampling points; S4: Optimization of operating conditions; S5: Monitoring and analysis; S6: Solvent recovery; S7: Compliance with regulations.

2. The VOCs exhaust gas collection method based on the two-solvent loading technology according to claim 1, characterized in that, Said S1 is further represented as: S1.1: Selection of polar and non-polar solvents; S1.2: Adjustment of the difference in polar index; S1.3: Selection of adjustment of boiling point and evaporation; S1.4: Control of chemical stability; S1.5: Control of toxicity and environmental friendliness; S1.6: Solubility range.

3. The VOCs exhaust gas collection method based on the two-solvent loading technology according to claim 2, characterized in that, Said S2 is further represented as: S2.1: Gas sampling system; S2.2: Solvent circulation system; S2.3: Temperature control system; S2.4: Monitoring and control system; S2.5: Maintenance and care system.

4. The VOCs exhaust gas collection method based on the two-solvent loading technology according to claim 3, characterized in that, Said S3 is further represented as: S3.1: Determination of the source of exhaust gases; S3.2: Distribution of exhaust gas composition; S3.3: Air flow analysis; S3.4: Height and position adjustment; S3.5: Environmental conditions; S3.6: Safety factors.

5. The VOCs exhaust gas collection method based on the two-solvent loading technology according to claim 4, characterized in that, Said S4 is further represented as: S4.1: Selection of sampling equipment; S4.2: Determination of sampling time; S4.3: Control of sampling flow rate; S4.4: Temperature and humidity control; S4.5: On-site monitoring and adjustment; S4.6: Periodic calibration of sampling points; S4.7: Data recording and quality control.

6. The VOCs exhaust gas collection method based on the two-solvent loading technology according to claim 5, characterized in that, Said S5 is further represented as: S5.1: Real-time monitoring; S5.2: Sampling; S5.3: Subsequent analysis.

7. The VOCs exhaust gas collection method based on the two-solvent loading technology according to claim 6, characterized in that, Said S6 is further represented as: S6.1: Solvent collection; S6.2: Solvent treatment; S6.3: Analysis and quality control; S6.4: Storage and reuse; S6.5: Performance monitoring and improvement.

8. The VOCs exhaust gas collection method based on the two-solvent loading technology according to claim 7, characterized in that, Said S7 is further represented as: S7.1: Environmental impact assessment; S7.2: Development of operating procedures; S7.3: Real-time monitoring and reporting.

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