VOCs treatment method, VOCs treatment system and coating plant

Abstract

The invention relates to the technical field of VOCs treatment, in particular to a VOCs treatment method, a VOCs treatment system and a coating plant. The VOCs processing method comprises the following steps: S1, establishing a model, and obtaining a relationship between VOCs inlet concentration and natural gas theoretical consumption through historical data training; s2, the actual consumption of the natural gas is adjusted according to the model, and the adjustment of the actual consumption of the natural gas according to the model comprises the steps that when the VOCs inlet concentration is smaller than 200 mg / m < 3 >, the supply of the natural gas is adjusted to be 30%-50% of a design value; when the inlet concentration is 200 mg / m < 3 >-600 mg / m < 3 >, the supply of the natural gas is maintained at a design value; and when the inlet concentration is larger than 600 mg / m < 3 >, the supply of the natural gas is adjusted to 10%-20% of the design value. The problem of natural gas energy waste caused by a traditional RTO treatment process is solved.

Description

Technical Field

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

[0002] VOCs are precursors of PM2.5 and ozone pollution. Annual emissions from industrial coatings account for 15%-20% of the country’s total emissions. Environmental protection regulations have strict emission limits (e.g., non-methane total hydrocarbons ≤ 50mg / m 3 ).

[0003] Large shipbuilding companies generally use zeolite rotor concentration + regenerative thermal oxidizer (RTO) treatment process, and its energy consumption accounts for 35%-40% of the total energy consumption of the paint shop. Figure 1 As shown, natural gas costs account for 81% of the energy consumption of VOCs treatment equipment.

[0004] However, traditional RTO treatment processes only operate according to a fixed schedule or a single concentration threshold. The supply of natural gas cannot dynamically match real-time operating condition fluctuations such as coating process switching (such as fluctuations in VOCs concentration caused by changes in the number of spray guns and the type of paint). As a result, the fixed operating mode of the traditional RTO treatment process causes waste of natural gas energy. Summary of the Invention

[0005] The purpose of this application is to provide a VOCs treatment method, a VOCs treatment system and a coating plant, thereby solving the problem of natural gas energy waste caused by traditional RTO treatment process.

[0006] According to a first aspect of the present application, a VOCs treatment method is provided, which is applied to a VOCs treatment system, wherein the VOCs treatment system includes a zeolite wheel concentration device and an RTO treatment device, wherein VOCs sequentially enter the zeolite wheel concentration device and the RTO treatment device for treatment and are discharged from the RTO treatment device;

[0007] The VOCs treatment method comprises:

[0008] Step S1, establishing a model and obtaining the relationship between VOCs inlet concentration and natural gas theoretical consumption through historical data training;

[0009] Step S2: adjusting the actual natural gas consumption according to the model so that the actual natural gas consumption is less than the theoretical natural gas consumption. Adjusting the actual natural gas consumption according to the model includes:

[0010] When the VOCs inlet concentration is less than 200 mg / m 3 When the VOCs inlet concentration is 200mg / m3 -600mg / m 3 When the VOCs inlet concentration is greater than 600 mg / m 3 When adjusting the natural gas supply to 10%-20% of the design value.

[0011] In any of the above technical solutions, further, in step S1, establish The model is trained with historical data to obtain the relationship between VOCs inlet concentration and natural gas consumption; are operating parameters, C is the VOCs inlet concentration, and E is the theoretical consumption of natural gas.

[0012] According to a second aspect of the present application, a VOCs treatment system is provided, wherein the VOCs treatment system executes the VOCs treatment method described above, and the VOCs treatment system further comprises a controller and a VOCs concentration detector; the RTO treatment device comprises a natural gas proportional valve; the VOCs concentration detector is capable of detecting the VOCs inlet concentration entering the zeolite rotor concentration device and sending the detected VOCs inlet concentration to the controller; when the VOCs inlet concentration is less than 200 mg / m 3 When the VOCs inlet concentration is 200mg / m 3 -600mg / m 3 When the VOCs inlet concentration is greater than 600 mg / m 3 When the controller adjusts the opening of the natural gas proportional valve, the supply of natural gas is adjusted to 10%-20% of the design value.

[0013] In any of the above technical solutions, further, when the VOCs inlet concentration is less than 200 mg / m 3 The controller controls the RTO processing equipment to start and stop once every predetermined time. During the start period of the RTO processing equipment, the controller adjusts the opening of the natural gas proportional valve so that the supply of natural gas is adjusted to 30%-50% of the design value.

[0014] In any of the above technical solutions, further, if the actual natural gas consumption deviates from the theoretical natural gas consumption by 10%-20%, the controller adjusts the opening of the natural gas proportional valve, wherein the adjustment accuracy is ±0.5%; if the actual natural gas consumption deviates from the theoretical natural gas consumption by more than 20%, the controller sends an alarm signal.

[0015] In any of the above technical solutions, further, the RTO processing equipment also includes a plurality of temperature detectors arranged in the RTO furnace, and the temperature detectors can send the detected temperature information to the controller; when the temperature difference detected by any two of the temperature detectors is greater than 250°C, the controller controls the RTO processing equipment to shut down.

[0016] In any of the above technical solutions, further, the RTO processing equipment also includes a purge fan and a catalytic combustion sensor, the catalytic combustion sensor is arranged in the RTO furnace, and the catalytic combustion sensor can send the detected VOCs concentration information to the controller; when the detected VOCs concentration in the furnace reaches 20% of the VOCs concentration explosion limit value, the controller controls the purge fan to blow inert gas into the furnace.

[0017] In any of the above technical solutions, further, the VOCs concentration detector is capable of detecting the VOCs outlet concentration discharged by the RTO treatment equipment and sending the detected VOCs outlet concentration to the controller; when the VOCs outlet concentration reaches 80% of the emission limit, the controller adjusts the opening of the natural gas proportional valve so that the supply of natural gas maintains the design value until the VOCs outlet concentration is lower than 80% of the emission limit.

[0018] In any of the above technical solutions, further, the RTO processing equipment also includes an audible and visual alarm and a central control terminal; when the actual natural gas consumption deviates from the theoretical natural gas consumption by more than 20%, the controller sends an alarm signal to the audible and visual alarm and the central control terminal; when the temperature difference detected by any two of the temperature detectors is greater than 250°C, the controller sends an alarm signal to the audible and visual alarm and the central control terminal, and controls the RTO processing equipment to shut down; when the detected VOCs concentration in the furnace reaches 20% of the explosion limit value of the VOCs concentration, the controller sends an alarm signal to the audible and visual alarm and the central control terminal, and controls the purge fan to blow inert gas into the furnace.

[0019] According to a third aspect of the present application, a painting plant for ships is provided, comprising the VOCs treatment system as described above.

[0020] The VOCs treatment methods of this application include:

[0021] Step S1, establishing a model and obtaining the relationship between VOCs inlet concentration and natural gas theoretical consumption through historical data training;

[0022] Step S2: adjusting the actual natural gas consumption according to the model so that the actual natural gas consumption is less than the theoretical natural gas consumption. Adjusting the actual natural gas consumption according to the model includes:

[0023] When the VOCs inlet concentration is less than 200 mg / m 3 When the VOCs inlet concentration is 200mg / m 3 -600mg / m 3 When the VOCs inlet concentration is greater than 600 mg / m 3 When adjusting the natural gas supply to 10%-20% of the design value.

[0024] According to the above technical features, the beneficial effects of this application are:

[0025] The VOCs treatment method of the present application first trains on historical data and establishes a model, through which the relationship between VOCs inlet concentration and theoretical natural gas consumption can be derived.

[0026] Afterwards, during the actual operation of the RTO treatment equipment (the test adjustment phase), the theoretical natural gas consumption was calculated by inputting the VOCs inlet concentration. Subsequently, the actual natural gas consumption was adjusted in stages to ensure that the actual natural gas consumption was less than the theoretical natural gas consumption. This means that a three-level control mode was established based on the VOCs concentration, and the natural gas supply was adjusted to match the different VOCs concentration fluctuations. The specific adjustment results are as follows:

[0027] When the VOCs inlet concentration is less than 200 mg / m 3 When the VOCs inlet concentration is 200mg / m 3 -600mg / m 3 When the VOCs inlet concentration is greater than 600 mg / m 3 When the VOCs are in the air, the natural gas supply is adjusted to 10%-20% of the design value. In this way, the three-level control mode adjusted by the model in this application effectively reduces the actual consumption of natural gas while ensuring that the VOCs emission limit meets the requirements. Compared with the existing technology, the natural gas saving of this application is mainly reflected in the VOCs inlet concentration <200mg / m 3 and VOCs inlet concentration>600mg / m 3 hour.

[0028] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 Shows the energy consumption cost ratio of traditional VOCs treatment equipment;

[0031] Figure 2 A graph showing the relationship between traditional VOCs inlet concentration and natural gas consumption;

[0032] Figure 3 The comparison curve of VOCs outlet concentration before and after optimization is shown;

[0033] Figure 4 A bar chart showing unit consumption from January to November after optimization. DETAILED DESCRIPTION

[0034] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, except for operations that must occur in a particular order, changes may be made that will be apparent upon understanding the disclosure of this application. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity.

[0035] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0036] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, it may be directly “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on,” “directly connected to,” “directly coupled to,” “directly over,” or “directly covering” another element, there may be no other elements intervening therebetween.

[0037] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0038] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are used only to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, a first member, component, region, layer, or portion in the examples described herein may also be referred to as a second member, component, region, layer, or portion without departing from the teachings of the examples.

[0039] For ease of description, spatial relational terms such as "above," "upper," "below," and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element would subsequently be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations "above" and "below," depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0040] The terms used herein are intended only to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular is intended to include the plural. The terms "comprise," "include," and "have" list the presence of stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0041] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include changes in shapes that occur during manufacturing.

[0042] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0043] The first aspect of the present application provides a VOCs treatment method, thereby solving the problem of natural gas energy waste caused by traditional RTO treatment processes.

[0044] The VOCs treatment method of the present application is applied to a VOCs treatment system, which includes a VOCs treatment device. The VOCs treatment device includes a zeolite wheel concentration device and an RTO treatment device. VOCs enter the zeolite wheel concentration device and the RTO treatment device in sequence for treatment and are discharged from the RTO treatment device.

[0045] The VOCs treatment methods of this application include:

[0046] Step S1, establishing a model and obtaining the relationship between VOCs inlet concentration and natural gas theoretical consumption through historical data training;

[0047] Step S2: adjusting the actual natural gas consumption according to the model so that the actual natural gas consumption is less than the theoretical natural gas consumption. Adjusting the actual natural gas consumption according to the model includes:

[0048] When the VOCs inlet concentration is less than 200 mg / m 3 When the VOCs inlet concentration is 200mg / m 3 -600mg / m 3 When the VOCs inlet concentration is greater than 600 mg / m 3 When adjusting the natural gas supply to 10%-20% of the design value.

[0049] That is to say, in the VOCs treatment method of the present application, in step S1:

[0050] First, historical data is trained and a model is established. After the model is established, the relationship between the VOCs inlet concentration and the theoretical natural gas consumption can be obtained.

[0051] As an example, in step S1:

[0052] Input layer: operating parameters VOCs concentration (C), energy consumption (E).

[0053] Algorithm layer: built using random forest regression algorithm Model, through historical data (sample size ≥ 100,000, the sample size can be selected Figure 2 VOCs inlet concentration and natural gas consumption) training, the prediction error is ≤5%. are operating parameters, C is the VOCs inlet concentration, and E is the theoretical consumption of natural gas.

[0054] Output layer: Generate energy consumption critical path analysis.

[0055] In step S1, the working conditions are divided into multiple categories (such as "single-gun low-speed spraying" and "multi-gun high-speed spraying") based on the fuzzy C-means clustering algorithm, and all of them are trained through historical data to establish a model.

[0056] In step S2, the actual natural gas consumption is adjusted according to the model (RTO hierarchical control strategy):

[0057] exist After the model was established, during the actual operation of the RTO treatment equipment (the test adjustment phase), the theoretical natural gas consumption was calculated by inputting the VOCs inlet concentration. Subsequently, the actual natural gas consumption was adjusted in stages, with the goal of ensuring that the actual natural gas consumption was less than the theoretical natural gas consumption. This meant that a three-level control mode was established based on the VOCs concentration, and the natural gas supply was adjusted to match the varying VOCs concentration fluctuations. The specific adjustment results are as follows:

[0058] When the VOCs inlet concentration is less than 200 mg / m 3 When the VOCs inlet concentration is 200mg / m 3 -600mg / m 3 When the VOCs inlet concentration is greater than 600 mg / m 3When the VOCs are in the air, the natural gas supply is adjusted to 10%-20% of the design value. In this way, the three-level control mode adjusted by the model in this application effectively reduces the actual consumption of natural gas while ensuring that the VOCs emission limit meets the requirements. Compared with the existing technology, the natural gas saving of this application is mainly reflected in the VOCs inlet concentration <200mg / m 3 and VOCs inlet concentration>600mg / m 3 hour.

[0059] The RTO hierarchical control strategy is shown in the following table.

[0060] <![CDATA[VOCs inlet concentration (mg / m 3 )]]> Control Mode Natural gas supply regulation RTO running time ＜200 Low concentration mode Reduce by 50%-70% Intermittent operation (start and stop once per hour) 200-600 Standard Mode Maintain design value Continuous operation ＞600 High concentration mode Reduce by 80%-90% Continuous operation

[0061] It should be noted here that because the VOCs inlet concentration is less than 200mg / m 3 When the inlet concentration of VOCs is greater than 600mg / m 3 When the inlet concentration is high, the natural gas supply can be very small. Because both natural gas and VOCs can participate in combustion in the RTO furnace, when the inlet concentration of VOCs is high, the natural gas supply can be very small.

[0062] In addition, the present application can further adjust the above-mentioned RTO hierarchical control strategy based on the VOCs treatment method described above, and continue to adjust the natural gas supply ratio on the basis of ensuring that the VOCs emission limit meets the requirements, thereby further reducing the actual consumption of natural gas.

[0063] For example, when the VOCs inlet concentration is less than 200 mg / m 3 When the RTO treatment equipment is set to start and stop once every predetermined time, the opening of the natural gas proportional valve is adjusted to 30%-50% of the design value during the RTO treatment equipment start period. It should be noted that the VOCs inlet concentration is less than 200mg / m 3 Because the inlet concentration is very small, when VOCs enter the zeolite wheel concentration equipment for treatment, the VOCs emission limit can be guaranteed. Therefore, when the VOCs inlet concentration is less than 200mg / m 3 When the RTO is running, the RTO can be selected to run intermittently, with a start-stop interval of 15-60 minutes, preferably 60 minutes.

[0064] Furthermore, the VOCs treatment method of the present application further includes step 3:

[0065] The VOCs inlet concentration, operating parameters and actual natural gas consumption are collected once per second, and the pulse noise is removed through the median filtering algorithm.

[0066] The model is called to predict the theoretical natural gas consumption under current operating conditions.

[0067] Dynamic adjustment execution:

[0068] If the actual natural gas consumption deviates from the theoretical natural gas consumption by more than 10%, the adjustment logic is triggered:

[0069] Low deviation (10%-20%): Automatically fine-tune the RTO natural gas proportional valve opening (adjustment accuracy ±0.5%). High deviation (>20%): Send an alarm signal, generate a manual intervention work order, and push it to the equipment maintenance system.

[0070] Furthermore, the VOCs treatment method of the present application also includes step 4, safety monitoring and feedback:

[0071] When the VOCs outlet concentration reaches 80% of the emission limit, the natural gas supply is maintained at the design value until the VOCs outlet concentration is lower than 80% of the emission limit.

[0072] The second aspect of the present application provides a VOCs treatment system, which performs the VOCs treatment method described above. The VOCs treatment system also includes a controller, a VOCs concentration detector, an industrial Internet of Things (IIoT) terminal, a smart meter, and a natural gas flow meter (accuracy ±0.5%). The VOCs concentration detector can be a laser spectrometer (detection range 0-2000mg / m 3 , with an accuracy of ±2%). Industrial Internet of Things (IIoT) terminals can be deployed to collect over 20 parameters, including spray equipment start / stop status, paint flow, and workshop temperature and humidity.

[0073] In addition, in the embodiment of the present application, the RTO treatment equipment includes a natural gas proportional valve. The VOCs concentration detector can detect the VOCs inlet concentration entering the zeolite rotor concentration device and send the detected VOCs inlet concentration to the controller; when the VOCs inlet concentration is less than 200 mg / m 3 When the VOCs inlet concentration is 200mg / m 3 -600mg / m 3 When the VOCs inlet concentration is greater than 600mg / m 3 When the gas supply is adjusted to 10%-20% of the design value, the controller adjusts the opening of the natural gas proportional valve.

[0074] Furthermore, if actual natural gas consumption deviates by 10%-20% from theoretical natural gas consumption, the controller adjusts the opening of the natural gas proportional valve with an adjustment accuracy of ±0.5%. If actual natural gas consumption deviates by more than 20% from theoretical natural gas consumption, the controller sends an alarm signal, generates a manual intervention work order, and pushes it to the equipment maintenance system.

[0075] Furthermore, the VOCs treatment system of the present application also includes a safety monitoring module, and the triple protection mechanism of the safety monitoring module is as follows:

[0076] Temperature Monitoring: The RTO processing equipment of this application also includes multiple temperature sensors installed within the RTO furnace. These sensors transmit detected temperature information to a controller. When the temperature difference between any two temperature sensors exceeds 250°C, the controller shuts down the RTO processing equipment. For example, an 8-point thermocouple array is deployed in the RTO combustion chamber to calculate the temperature field uniformity in real time. When the temperature difference exceeds 250°C, the controller shuts down the RTO processing equipment.

[0077] Combustible gas warning:

[0078] The RTO treatment equipment also includes a purge blower and a catalytic combustion sensor. The catalytic combustion sensor is installed inside the RTO furnace and transmits the detected VOC concentration information to a controller. When the detected VOC concentration in the furnace reaches 20% of the explosion limit, the controller controls the purge blower to blow inert gas into the furnace. For example, the catalytic combustion sensor monitors the VOC concentration in the furnace and automatically initiates the inert gas purge when it exceeds 20% of the explosion limit (LEL).

[0079] Sound and light alarm linkage:

[0080] Under abnormal working conditions, the workshop sound and light alarm is triggered within 0.5 seconds, and the early warning information is pushed to the central control room simultaneously (response delay ≤ 200ms). For example, the RTO processing equipment also includes an sound and light alarm and a central control terminal. When the actual natural gas consumption deviates from the theoretical natural gas consumption by more than 20%, the controller sends an alarm signal to the sound and light alarm and the central control terminal. When the temperature difference detected by any two temperature detectors is greater than 250°C, the controller sends an alarm signal to the sound and light alarm and the central control terminal, and controls the RTO processing equipment to shut down. When the detected VOCs concentration in the furnace reaches 20% of the VOCs concentration explosion limit, the controller sends an alarm signal to the sound and light alarm and the central control terminal, and controls the purge fan to blow inert gas into the furnace.

[0081] Furthermore, the VOCs treatment system of the present application also includes safety monitoring and feedback. The VOCs concentration detector can detect the VOCs outlet concentration discharged by the RTO treatment equipment and send the detected VOCs outlet concentration to the controller; when the VOCs outlet concentration reaches 80% of the emission limit, the controller adjusts the opening of the natural gas proportional valve so that the supply of natural gas maintains the design value until the VOCs outlet concentration is lower than 80% of the emission limit. Alternatively, a safety parameter inspection is performed every 10 minutes. If the outlet concentration is detected to be greater than 45mg / m 3 (close to 80% of the emission limit), immediately switch to standard mode.

[0082] According to a third aspect of the present application, a painting plant for ships is provided, comprising the VOCs treatment system as described above.

[0083] In summary, this application meets the environmental emission compliance (export concentration ≤ 50mg / m 3 ) and production continuity, through dynamic working condition-concentration-energy consumption linkage control, we can achieve:

[0084] Energy consumption reduced by ≥20%.

[0085] The equipment operation stability is improved (failure downtime rate is reduced by ≥15%).

[0086] 1. Energy efficiency breakthrough, offshore coatings application data (2023):

[0087] Natural gas consumption increased from 820,000 m 3 / year down to 630,000 m 3 / year, a decrease of 23%.

[0088] Electricity consumption has dropped from 1.35 million kWh / year to 1.08 million kWh / year, a 20% reduction (in low-concentration mode, RTO shutdowns save energy, such as for fans).

[0089] Annual cost savings of RMB 2.17 million (natural gas unit price RMB 3 / m 3 , electricity price 0.8 yuan / kWh).

[0090] Energy consumption trends can be seen in Figure 4 , Q4 unit consumption was as low as 1.52 yuan / ㎡, a year-on-year decrease of 27% (the horizontal axis is the month, the vertical axis is the unit consumption (yuan / ㎡), and the curve shows a continuous downward trend).

[0091] 2. Enhanced environmental performance:

[0092] Improved outlet concentration stability: standard deviation from 12 mg / m 3 Reduced to 5 mg / m 3 , the number of times exceeding the standard dropped from an average of 18 times per year to 0 times (see Figure 3);

[0093] 3. Device management upgrade:

[0094] The accuracy rate of fault warning reaches 92%, and unplanned downtime is reduced by 40%.

[0095] Reduced operational complexity: The frequency of manual intervention has been reduced from 12 times per day to 3 times, and employee training cycles have been shortened by 50%.

[0096] The supporting equipment for this application includes 2 sets of zeolite rotors + RTO treatment units (processing air volume 20000m 3 In actual application, the effect is verified through the following scenarios:

[0097] Low concentration scenario: night single-gun touch-up painting operation (concentration 150mg / m 3 ), the system automatically switches to low concentration mode, the RTO starts and stops once per hour, and natural gas consumption is reduced by 42%.

[0098] High concentration scene: multi-gun spraying during the day (concentration 800mg / m 3 ), the outlet concentration in high concentration mode is stable at 22mg / m 3 , energy consumption only increases by 8% compared with the traditional mode (the traditional mode requires a 20% increase in energy consumption).

[0099] Summary of innovations:

[0100] 1. Dynamic ternary model: For the first time, operating parameters are incorporated into the energy consumption analysis of VOCs treatment equipment, breaking through the limitations of traditional single-factor control.

[0101] 2. Hierarchical flexible control: Establish a dynamic mapping relationship between concentration and energy consumption to achieve a shift from “passive compliance” to “active optimization”.

[0102] 3. Full-chain intelligence: Integrating equipment control, safety monitoring, and energy management, building a closed-loop energy efficiency optimization system, and providing the industry with an integrated "monitoring-analysis-regulation-management" solution.

[0103] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed in the present application, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered by the scope of protection of the present application.

Claims

1. A VOCs treatment method, characterized in that: Applied to VOCs treatment system, the VOCs treatment system includes zeolite wheel concentration equipment and RTO treatment equipment, VOCs enter the zeolite wheel concentration equipment and the RTO treatment equipment in sequence for treatment, and are discharged by the RTO treatment equipment; The VOCs treatment method comprises: Step S1, establishing a model and obtaining the relationship between VOCs inlet concentration and natural gas theoretical consumption through historical data training; Step S2: adjusting the actual natural gas consumption according to the model so that the actual natural gas consumption is less than the theoretical natural gas consumption. Adjusting the actual natural gas consumption according to the model includes: When the VOCs inlet concentration is less than 200 mg / m 3 When the natural gas supply is adjusted to 30%-50% of the design value; When the VOCs inlet concentration is 200 mg / m 3 -600mg / m 3 When the natural gas supply is maintained at the design value; When the VOCs inlet concentration is greater than 600 mg / m 3 When the natural gas supply is adjusted to 10%-20% of the design value.

2. The VOCs treatment method according to claim 1, characterized in that: In step S1, establish The model is trained with historical data to obtain the relationship between VOCs inlet concentration and natural gas consumption; are operating parameters, C is the VOCs inlet concentration, and E is the theoretical consumption of natural gas.

3. A VOCs treatment system, characterized in that: The VOCs treatment system performs the VOCs treatment method according to claim 1 or 2, and the VOCs treatment system further comprises a controller and a VOCs concentration detector; the RTO treatment equipment comprises a natural gas proportional valve; The VOCs concentration detector is capable of detecting the VOCs inlet concentration entering the zeolite rotor concentration device and sending the detected VOCs inlet concentration to the controller; When the VOCs inlet concentration is less than 200 mg / m 3 When the controller adjusts the opening of the natural gas proportional valve so that the supply of natural gas is adjusted to 30%-50% of the design value; When the VOCs inlet concentration is 200 mg / m 3 -600mg / m 3 When the controller adjusts the opening of the natural gas proportional valve so that the supply of natural gas maintains the design value; When the VOCs inlet concentration is greater than 600 mg / m 3 When the controller adjusts the opening of the natural gas proportional valve, the supply of natural gas is adjusted to 10%-20% of the design value.

4. The VOCs treatment system according to claim 3, characterized in that: When the VOCs inlet concentration is less than 200 mg / m 3 The controller controls the RTO processing equipment to start and stop once every predetermined time. During the start period of the RTO processing equipment, the controller adjusts the opening of the natural gas proportional valve so that the supply of natural gas is adjusted to 30%-50% of the design value.

5. The VOCs treatment system according to claim 3, characterized in that: If the actual natural gas consumption deviates from the theoretical natural gas consumption by 10%-20%, the controller adjusts the opening of the natural gas proportional valve with an adjustment accuracy of ±0.5%; If the actual natural gas consumption deviates from the theoretical natural gas consumption by more than 20%, the controller sends an alarm signal.

6. The VOCs treatment system according to claim 5, characterized in that: The RTO processing equipment further includes a plurality of temperature detectors disposed in the RTO furnace, wherein the temperature detectors are capable of sending detected temperature information to the controller; When the temperature difference detected by any two of the temperature detectors is greater than 250° C., the controller controls the RTO processing equipment to shut down.

7. The VOCs treatment system according to claim 6, characterized in that: The RTO treatment equipment further includes a purge blower and a catalytic combustion sensor, wherein the catalytic combustion sensor is disposed in the RTO furnace and is capable of sending detected VOCs concentration information to the controller; When the detected VOCs concentration in the furnace reaches 20% of the explosion limit value of the VOCs concentration, the controller controls the purge blower to blow inert gas into the furnace.

8. The VOCs treatment system according to claim 3, characterized in that: The VOCs concentration detector is capable of detecting the VOCs outlet concentration discharged by the RTO treatment equipment and sending the detected VOCs outlet concentration to the controller; When the VOCs outlet concentration reaches 80% of the emission limit, the controller adjusts the opening of the natural gas proportional valve so that the supply of natural gas maintains the design value until the VOCs outlet concentration is lower than 80% of the emission limit.

9. The VOCs treatment system according to claim 7, characterized in that: The RTO processing equipment also includes an audible and visual alarm and a central control terminal; When the actual natural gas consumption deviates from the theoretical natural gas consumption by more than 20%, the controller sends an alarm signal to the sound and light alarm and the central control terminal; When the temperature difference detected by any two of the temperature detectors is greater than 250° C., the controller sends an alarm signal to the sound and light alarm and the central control terminal, and controls the RTO processing equipment to shut down; When the detected VOCs concentration in the furnace reaches 20% of the explosion limit of the VOCs concentration, the controller sends an alarm signal to the sound and light alarm and the central control terminal, and controls the purge fan to blow inert gas into the furnace.

10. A painting plant for ships, characterized in that: Comprising a VOCs treatment system as described in any one of claims 3-9.

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