Method for determining amount of VOCs waste gas treated by petrochemical heating furnace in cooperation and treatment method

Abstract

This application discloses a method for determining and treating VOCs waste gas in a petrochemical heating furnace, relating to the field of petrochemical technology. First, the amount of VOCs waste gas to be treated is determined. Then, based on this determination, VOCs waste gas with the corresponding blending ratio is introduced into the operating petrochemical heating furnace. Since the operating petrochemical heating furnace is releasing heat through combustion, there is no need to concentrate the VOCs waste gas or add additional fuel gas, thereby reducing costs and energy consumption. This application can utilize the energy generated by the heat released from the combustion of fuel gas in existing petrochemical heating furnaces to treat VOCs waste gas, thereby reducing emissions. It eliminates the need for external concentration equipment and combustion furnaces, enabling the treatment of low-concentration VOCs waste gas without the need for additional combustion fuel, saving resources and reducing energy waste.

Description

Technical Field

[0001] This application relates to the field of petrochemical technology, and in particular to a method for determining and treating VOCs waste gas volume in a petrochemical heating furnace. Background Technology

[0002] With the acceleration of industrialization and urbanization, air pollution problems characterized by high concentrations of ozone (O3) and fine particulate matter (PM2.5) are becoming increasingly severe in my country. As precursors to O3 and PM2.5 pollution, VOCs (volatile organic compounds) emissions are increasingly in demand for treatment.

[0003] 56% of VOC emissions come from industrial sources, with the petrochemical industry accounting for 40% of these industrial sources. Therefore, controlling VOC emissions from the petrochemical industry is crucial for environmental improvement.

[0004] Currently, there are various methods for treating VOCs waste gas, mainly including adsorption, absorption, thermal degradation (including RTO, RCO, etc.), condensation recovery, microbial degradation, membrane separation, and catalytic oxidation. In the petrochemical industry, combustion methods such as RTO and RCO are mainly used for VOCs waste gas treatment. Since petrochemical VOCs waste gas mainly originates from fugitive emissions in areas such as oil and gas storage tank areas, loading and unloading areas, and solid / liquid waste treatment areas, the VOCs content in the waste gas is low and cannot be spontaneously combusted. Therefore, when using combustion methods such as RTO or RCO for VOCs waste gas emission reduction, it is often necessary to concentrate the VOCs waste gas before combustion and add fuel gas during combustion to maintain the combustion state. This method reduces VOCs waste gas emissions but increases costs, energy consumption, carbon emissions, and land occupation. Summary of the Invention

[0005] The purpose of this application is to provide a method for determining the amount of VOCs waste gas to be co-treated in a petrochemical heating furnace and a treatment method that eliminates the need for additional waste gas concentration and the addition of fuel gas during VOCs waste gas emission reduction treatment, thereby reducing costs and energy consumption.

[0006] To achieve the above objectives, this application provides the following solution: In a first aspect, this application provides a method for determining the amount of VOCs waste gas to be co-treated by a petrochemical heating furnace, the method comprising: A laboratory gas with the same physical properties as VOCs was prepared to obtain a VOCs-fitting gas. The initial flame lift velocity and extinguishing limit of the flame after different mixing ratios of mixed gas were introduced into the combustion-supporting side of the coaxial jet experimental platform were obtained, and the first experimental results of different mixing ratios were obtained; the mixed gas is the gas after the VOCs fitting gas is mixed with air; Based on the results of the first experiment with different blending ratios, the range of blending ratios that can enhance flame stability is determined, and the first applicable range is obtained; the ability to enhance flame stability means that the fuel fitting gas flow rate corresponding to the initial flame lift velocity and the blow-out limit is higher than when the blending ratio is zero. The flame conditions and pollutant emissions of mixed gases with different mixing ratios within the first applicable range were obtained after being introduced into the combustion-supporting side of the coaxial jet experimental platform, and the second experimental results for different mixing ratios were obtained. The range of mixing ratios corresponding to the difference between the second experimental results of different mixing ratios and the preset experimental results being less than a preset threshold is obtained to obtain the second applicable range; the preset experimental results are the flame conditions and pollutant emissions after a mixed gas with a mixing ratio of zero is introduced into the combustion-supporting side of the coaxial jet experimental platform. Combustion simulations were performed using mixed gases with different blending ratios within the second applicable range to obtain simulation result parameters; Determine a reasonable blending ratio based on the simulation results parameters.

[0007] Optionally, obtaining the initial flame lift-off velocity and extinguishing limit after introducing mixed gases with different mixing ratios into the combustion-supporting side of the coaxial jet experimental platform to obtain the first experimental results for different mixing ratios specifically includes: The fuel fitting gas was introduced into the fuel side of the coaxial jet experimental platform; Mixed gases with different mixing ratios were introduced into the combustion-supporting side of the coaxial jet experimental platform; The initial push velocity and extinguishing limit of the flame after different mixing ratios of mixed gas were introduced into the combustion-supporting side of the coaxial jet experimental platform were obtained, and the first experimental results for different mixing ratios were obtained.

[0008] Optionally, the simulation result parameters include: the wall temperature, pollutant emissions, VOCs treatment rate, thermal efficiency, and tube outlet temperature at different mixing ratios.

[0009] Optionally, the physical property parameters include: calorific value, energy density, and elemental content.

[0010] Optionally, the flame conditions include: flame shape, flame size, and flame temperature; The pollutant emission information includes: the amount of pollutants emitted.

[0011] Secondly, this application provides a method for treating VOCs waste gas in conjunction with a petrochemical heating furnace, characterized in that the method includes: A reasonable blending ratio is obtained; the reasonable blending ratio is obtained by the method for determining the amount of VOCs waste gas to be co-treated by the petrochemical heating furnace described in any of the above-mentioned methods; According to the reasonable mixing ratio, the VOCs waste gas is mixed with air and then introduced into the working petrochemical heating furnace.

[0012] Optionally, the VOCs waste gas is mixed with air according to the stated reasonable mixing ratio and then introduced into the operating petrochemical heating furnace, specifically including: According to the reasonable mixing ratio, VOCs waste gas is mixed with air to obtain a mixed gas; The mixed gas is delivered from the air inlet or a dedicated gas line of the petrochemical heating furnace into the working petrochemical heating furnace.

[0013] Thirdly, this application provides a treatment device for co-processing VOCs waste gas in a petrochemical heating furnace, characterized in that the treatment device for co-processing VOCs waste gas in a petrochemical heating furnace includes: a petrochemical heating furnace; The petrochemical heating furnace is equipped with a dedicated gas passage; The dedicated gas path is used to mix VOCs waste gas with air according to a reasonable mixing ratio and then introduce it into the petrochemical heating furnace in operation; the reasonable mixing ratio is obtained by the method for determining the amount of VOCs waste gas to be co-treated by the petrochemical heating furnace as described above.

[0014] Optionally, the dedicated gas passage is located at the bottom or wall of the petrochemical heating furnace.

[0015] Optionally, the dedicated gas passage is located at the bottom of the furnace, on the burner, or in the wall of the radiant chamber of the petrochemical heating furnace. According to the specific embodiments provided in this application, the following technical effects are disclosed: This application provides a method for determining the amount of VOCs waste gas to be co-treated in a petrochemical heating furnace and a treatment method thereof. First, the amount of VOCs waste gas to be co-treated is determined. Then, based on this determination, VOCs waste gas with the corresponding blending ratio is introduced into the operating petrochemical heating furnace. Since the operating petrochemical heating furnace is releasing heat through combustion, there is no need to concentrate the VOCs waste gas or add additional fuel gas, thereby reducing costs and energy consumption. This application can utilize the energy generated by the heat released from the combustion of fuel gas in existing petrochemical heating furnaces to treat VOCs waste gas, thereby reducing emissions. It eliminates the need for external concentration equipment and combustion furnaces, enabling the treatment of low-concentration VOCs waste gas without the need for additional combustion fuel, saving resources and reducing energy waste. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A flowchart illustrating a method for determining the amount of VOCs waste gas to be co-treated in a petrochemical heating furnace, provided as an embodiment of this application; Figure 2 This is a schematic flowchart illustrating a method for co-processing VOCs waste gas in a petrochemical heating furnace, as provided in an embodiment of this application.

[0018] Figure 3 This is a schematic diagram of a burner air-side inlet method provided in an embodiment of this application; Figure 4 This is a schematic diagram of a separate inlet method at the furnace bottom provided in an embodiment of this application; Figure 5 This is a schematic diagram of a separate access method at the wall provided in an embodiment of this application.

[0019] Figure label: 1-Heating furnace, 2-Furnace tube, 3-Burner, 4-Burner shell, 5-Fuel pipe, 6-VOCs exhaust gas conveying pipe. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] This application provides a low-operating-cost, simple, and efficient VOCs waste gas treatment process suitable for treating low concentrations, along with a corresponding applicability evaluation method to ensure reliable operation and promising application prospects. Its purpose is to address the shortcomings of traditional VOCs treatment methods, thereby providing a low-operating-cost, simple, and efficient VOCs waste gas treatment process suitable for treating low concentrations, along with its applicability evaluation method.

[0022] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] In another exemplary embodiment, such as Figure 1 As shown, a method for determining the amount of VOCs waste gas to be co-treated in a petrochemical heating furnace is provided, including: A1. Prepare a laboratory gas with the same physical properties as VOCs to obtain a VOCs-fitting gas. The physical properties include: calorific value, energy density, and elemental content.

[0024] In this embodiment, the experimental gas is prepared by using relevant testing instruments to determine the physical quantities such as calorific value, energy density, and element content of fuel gas and VOCs waste gas as target parameters. Laboratory gases with similar physical quantities to the above-mentioned fuel gas and VOCs waste gas are prepared by using one or more gases, namely fuel fitting gas and VOCs fitting gas.

[0025] A2. Obtain the initial push velocity and extinguishing limit of the flame after introducing mixed gases with different mixing ratios into the combustion-supporting side of the coaxial jet experimental platform, and obtain the first experimental results for different mixing ratios; the mixed gas is the gas after mixing the VOCs fitting gas with air.

[0026] In this embodiment, a combustion experiment was first conducted when the VOCs waste gas mixing ratio was 0: First, the prepared fuel-fitting gas is introduced into the fuel side of the coaxial jet experimental platform, and a certain amount of air is introduced into the combustion-supporting side for combustion support. The excess air coefficient must be consistent with the engineering specifications.

[0027] Then, the flame pattern was observed and recorded by adjusting the flow rate of the fuel fitting gas.

[0028] Finally, by analyzing the effect of the fuel gas flow rate on the flame morphology, the initial flame lift velocity and the blow-out limit are obtained. As the fuel gas flow rate increases, the flame gradually elongates from a short, attached flame. Then, when the fuel gas flow rate reaches a certain value, the flame transforms from an attached flame into a lift flame. The fuel gas flow rate at this point is the initial flame lift velocity. As the fuel gas flow rate continues to increase, the flame lift height (the distance from the fuel gas outlet to the bottom of the flame) gradually increases until it is extinguished. The fuel gas flow rate at which the flame is extinguished is the flame blow-out limit.

[0029] Then, a VOCs waste gas co-firing experiment was conducted: First, the prepared fuel-fit gas is introduced into the fuel side of the coaxial jet experimental platform (this experimental platform is for studying the characteristics of diffusion flames; it only studies flame characteristics and does not simulate a real petrochemical heating furnace). The prepared VOCs-fit gas is mixed with air at a certain mixing ratio and then introduced into the combustion-supporting side of the coaxial jet experimental platform. The mixing ratio ranges from 0 to 25% of the lower explosive limit, and the excess air coefficient remains consistent with that mentioned above.

[0030] Then, under different mixing ratios, the flow rate of the fuel-fit gas was adjusted, and the flame morphology at different flow rates was recorded. Finally, by analyzing the effect of flow rate on flame morphology at different blending ratios, the flame lift-up velocity and extinguishing limit at different blending ratios were obtained. The analysis process was as follows: the flame morphology at different fuel gas flow rates under different blending ratios was recorded using a high-speed camera, and the flame lift-up velocity and extinguishing limit velocity at different blending ratios were obtained by analyzing the flame morphology.

[0031] A3. Based on the results of the first experiment with different blending ratios, determine the range of blending ratios that can enhance flame stability, and obtain the first applicable range; the ability to enhance flame stability means that the fuel fitting gas flow rate corresponding to the initial flame lift speed and the blow-out limit is higher than when the blending ratio is zero.

[0032] This embodiment determines the effect of VOCs waste gas blending ratio on combustion stability: First, based on the above experimental results, curves showing the changes in initial flame lift rate and extinguishing limit with the mixing ratio were plotted.

[0033] Then, the influence of VOCs blending ratio on flame stability is determined by analyzing the change curves. If the initial flame lift velocity and the fuel gas flow rate corresponding to the extinguishing limit are higher when the blending ratio is non-zero compared with the unblended (i.e., the blending ratio is zero) time, it indicates that the blending ratio enhances the flame stability; otherwise, it indicates that the blending ratio weakens the flame stability. Finally, the blending ratio that enhances flame stability was selected as the value for the first applicable range of VOCs exhaust gases that can be co-fired.

[0034] A4. Obtain the flame and pollutant emission conditions after passing mixed gases with different mixing ratios within the first applicable range into the combustion-supporting side of the coaxial jet experimental platform, and obtain the second experimental results for different mixing ratios.

[0035] A5. Obtain the mixing ratio range corresponding to the difference between the second experimental results of different mixing ratios and the preset experimental results being less than a preset threshold, thus obtaining the second applicable range; the preset experimental results are the flame condition and pollutant emission condition after a mixed gas with a mixing ratio of zero is introduced into the combustion-supporting side of the coaxial jet experimental platform. The flame condition includes: flame shape, flame size, and flame temperature; the pollutant emission condition includes: pollutant emission amount.

[0036] This embodiment determines the effect of VOCs waste gas blending ratio on combustion state: First, based on the experimental setup described above, the fuel fitting gas flow rate is set according to the maximum value of the fuel fitting gas flow rate under the initial flame push state at different mixing ratios within the first applicable range.

[0037] Secondly, a combustion experiment was conducted under the condition that the excess air coefficient was consistent with that described above.

[0038] Then, the flame shape, flame size, flame temperature and pollutant emissions were recorded under different blending ratios, and the relationship curves between the aforementioned dependent variables and the VOCs blending ratio were plotted.

[0039] Finally, analyzing the above relationship curves, compared with the unmixed state, the mixing ratio when the difference in the dependent variable is no more than 5% is taken as the second applicable range value.

[0040] A6. Simulate combustion using mixed gases with different blending ratios within the second applicable range to obtain simulation result parameters. These simulation result parameters include: baffle temperature, pollutant emissions, VOCs treatment rate, thermal efficiency, and tube outlet temperature at different blending ratios.

[0041] The VOCs waste gas co-firing simulation in this embodiment includes: First, a numerical simulation model was established with reference to the target petrochemical heating furnace; the model was then built using CFD (Computational Fluid Dynamics) numerical simulation software.

[0042] Then, referring to the engineering operation parameters, simulation calculations were performed for combustion without VOCs. Parameters such as retaining wall temperature, pollutant emissions, VOCs treatment rate, thermal efficiency, and tube outlet temperature were statistically analyzed and compared with engineering data to verify the reliability of the model.

[0043] Finally, within the second applicable range, simulation calculations were performed for different mixing ratios from large to small, and parameters such as baffle temperature, pollutant emissions, VOCs treatment rate, thermal efficiency, and tube outlet temperature were statistically analyzed for different mixing ratios.

[0044] A7. Determine a reasonable blending ratio based on the simulation results parameters.

[0045] In this embodiment, the treatment capacity and operating parameters for co-processing VOCs waste gas are determined as follows: First, determine whether the tube outlet temperature obtained in the above simulation meets the process requirements. If it does, proceed to the next step; otherwise, reduce the VOCs blending ratio and re-evaluate.

[0046] Secondly, determine whether the VOCs treatment rate R is not less than 95%. If so, proceed to the next step; otherwise, reduce the VOCs blending ratio and repeat the first step. The formula for calculating the VOCs treatment rate R is as follows: R = (C0 - C1) / C0 × 100%; In the formula: R is the VOCs treatment rate, C0 is the VOCs exhaust gas concentration when the baseline oxygen content is 3% before combustion, and C1 is the VOCs exhaust gas concentration when the baseline oxygen content is 3% after combustion. Then, determine whether the pollutant emissions meet the local emission standards, and whether the baffle temperature and thermal efficiency meet the satisfactory requirements. If so, determine that the blending ratio is the maximum allowable processing capacity and operating parameters when the petrochemical heating furnace co-processes VOCs. Otherwise, reduce the VOCs blending ratio and repeat the first step of judgment.

[0047] In one exemplary embodiment, such as Figure 2 As shown, a method for treating VOCs waste gas in conjunction with a petrochemical heating furnace is provided, comprising: S1. Obtain a reasonable blending ratio; the reasonable blending ratio is obtained by the method for determining the amount of VOCs waste gas to be co-treated by the petrochemical heating furnace as described above. S2. The VOCs waste gas is mixed with air according to the reasonable mixing ratio and then introduced into the working petrochemical heating furnace.

[0048] Specifically, the process of mixing VOCs waste gas with air according to the stated appropriate blending ratio and then introducing the mixture into the operating petrochemical heating furnace includes: According to the reasonable mixing ratio, VOCs waste gas is mixed with air to obtain a mixed gas; The mixed gas is delivered from the air inlet or a dedicated gas line of the petrochemical heating furnace into the working petrochemical heating furnace.

[0049] As an optional implementation method, such as Figure 3 , Figure 4 and Figure 5 As shown, this embodiment divides the access methods into three types based on different locations: Figure 3 The VOCs waste gas enters the heating furnace 1 through the VOCs waste gas delivery pipe 6 along with the burner air, using a burner air side introduction method. Figure 4 VOCs waste gas is introduced into the furnace 1 from the bottom through the VOCs waste gas conveying pipe 6. Figure 5 The method involves introducing VOCs waste gas through the VOCs waste gas delivery pipe 6 from the wall of the radiant chamber of the heating furnace 1 into the wall inside the heating furnace 1.

[0050] During operation, fuel gas is injected into the radiant chamber of the heating furnace 1 through fuel pipe 5, and completes combustion and heat release with the aid of air. After combustion, a slight negative pressure is formed inside the furnace. Due to the pressure drop, air enters the heating furnace 1 from the burner 3 to maintain the combustion environment. The fuel gas is the fuel required for conventional combustion in the heating furnace, and its combustible components are H2, CO, H2S, and C1-C5 hydrocarbon gases, and may also contain more or less N2, O2, CO2, SO2, etc.

[0051] When VOCs waste gas needs to be treated in a coordinated manner, one or more of the three coordinated treatment methods can be selected. The VOCs waste gas is introduced into the radiation chamber of the heating furnace 1 through the VOCs waste gas conveying pipe 6, and combustion destruction occurs under the heat release of fuel gas combustion.

[0052] Based on the same inventive concept, this application also provides a treatment device for co-processing VOCs waste gas in a petrochemical heating furnace, the treatment device for co-processing VOCs waste gas in a petrochemical heating furnace includes: a petrochemical heating furnace.

[0053] The petrochemical heating furnace is equipped with a dedicated gas passage.

[0054] The dedicated gas path is used to mix VOCs waste gas with air according to a reasonable mixing ratio and then introduce it into the petrochemical heating furnace in operation; the reasonable mixing ratio is obtained by the method for determining the amount of VOCs waste gas to be co-treated by the petrochemical heating furnace as described above.

[0055] The dedicated gas passage is located at the bottom or wall of the petrochemical heating furnace.

[0056] Specifically, the dedicated gas passage is located at the bottom of the furnace, on the burner, or on the wall of the radiant chamber of the petrochemical heating furnace.

[0057] In an exemplary embodiment, a method for co-treating VOCs waste gas in a petrochemical heating furnace and an evaluation of its applicability are provided. This method relies on the combustion characteristics of the petrochemical heating furnace itself to treat VOCs waste gas through combustion, and mainly includes three co-treatment methods: air introduction from the burner side, separate introduction at the furnace bottom, and separate introduction at the wall.

[0058] Among them: air side inlet refers to the method of mixing VOCs exhaust gas with the combustion air of the heating furnace and then conveying it into the interior of the heating furnace through the air inlet of the heating furnace.

[0059] Among them: separate introduction at the furnace bottom refers to the method of transporting VOCs exhaust gas from the bottom of the heating furnace to the inside of the heating furnace through a dedicated gas passage, which can be located at the bottom of the furnace or on the burner.

[0060] Among them: "separate inlet at the wall" refers to the method of transporting VOCs exhaust gas from the wall of the heating furnace radiation chamber to the interior of the heating furnace through a dedicated gas passage.

[0061] The applicability evaluation method includes: preparation of experimental gas, laboratory combustion experiment, simulation of VOCs waste gas co-firing, determination of VOCs waste gas treatment capacity and operating parameters for co-treatment.

[0062] Among them: preparing experimental gas refers to simplifying the complex composition of fuel gas and VOCs waste gas into a mixture of one or more gases according to physical quantities such as calorific value, energy density, and element content as target parameters.

[0063] Among them: laboratory combustion experiments, including combustion experiments without VOCs waste gas, VOCs waste gas co-firing experiments, the influence of VOCs waste gas blending ratio on combustion stability, and the influence of VOCs waste gas blending ratio on combustion state, refers to studying the influence of VOCs waste gas co-firing on combustion stability (including: initial flame lift velocity and extinction limit) and combustion state (including: flame shape, flame size, flame temperature, and pollutant emissions) through a coaxial jet experimental platform, so as to preliminarily determine the applicable range of blending ratios for synergistic treatment of VOCs waste gas.

[0064] Among them, VOCs co-firing simulation refers to the simulation of the operating status of petrochemical heating furnaces in co-processing VOCs waste gas based on CFD numerical simulation technology (including: baffle temperature, pollutant emissions, VOCs treatment rate, thermal efficiency, tube outlet temperature, etc.).

[0065] Among them, the determination of the treatment capacity and operating parameters of VOCs waste gas co-processing refers to the determination of the final treatment capacity and operating parameters of VOCs waste gas co-processing by comparing the simulation results of VOCs waste gas co-firing with the process requirements and relevant policy requirements.

[0066] The beneficial effects of this invention are as follows: it can utilize the heat released from the combustion of fuel gas in existing petrochemical heating furnaces to treat VOCs waste gas, thereby reducing emissions. It does not require external concentration equipment and combustion furnaces, can treat low-concentration VOCs waste gas, and does not require the addition of combustion-supporting fuels, thus saving resources and reducing energy waste.

[0067] The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0068] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method for determining the amount of VOCs waste gas to be co-treated in a petrochemical heating furnace, characterized in that, The method for determining the amount of VOCs waste gas to be co-treated by the petrochemical heating furnace includes: A laboratory gas with the same physical properties as VOCs was prepared to obtain a VOCs-fitting gas. The initial flame lift velocity and extinguishing limit of the flame after different mixing ratios of mixed gas were introduced into the combustion-supporting side of the coaxial jet experimental platform were obtained, and the first experimental results of different mixing ratios were obtained; the mixed gas is the gas after the VOCs fitting gas is mixed with air; Based on the results of the first experiment with different blending ratios, the range of blending ratios that can enhance flame stability is determined, and the first applicable range is obtained; the ability to enhance flame stability means that the fuel fitting gas flow rate corresponding to the initial flame lift velocity and the blow-out limit is higher than when the blending ratio is zero. The flame conditions and pollutant emissions of mixed gases with different mixing ratios within the first applicable range were obtained after being introduced into the combustion-supporting side of the coaxial jet experimental platform, and the second experimental results for different mixing ratios were obtained. The range of mixing ratios corresponding to the difference between the second experimental results of different mixing ratios and the preset experimental results being less than a preset threshold is obtained to obtain the second applicable range; the preset experimental results are the flame conditions and pollutant emissions after a mixed gas with a mixing ratio of zero is introduced into the combustion-supporting side of the coaxial jet experimental platform. Combustion simulations were performed using mixed gases with different blending ratios within the second applicable range to obtain simulation result parameters; Determine a reasonable blending ratio based on the simulation results parameters.

2. The method for determining the amount of VOCs waste gas to be co-treated by the petrochemical heating furnace according to claim 1, characterized in that, The process of obtaining the initial flame lift velocity and extinguishing limit of the flame after introducing mixed gases with different mixing ratios into the combustion-supporting side of the coaxial jet experimental platform, and obtaining the first experimental results for different mixing ratios, specifically includes: The fuel fitting gas was introduced into the fuel side of the coaxial jet experimental platform; Mixed gases with different mixing ratios were introduced into the combustion-supporting side of the coaxial jet experimental platform; The initial push velocity and extinguishing limit of the flame after different mixing ratios of mixed gas were introduced into the combustion-supporting side of the coaxial jet experimental platform were obtained, and the first experimental results for different mixing ratios were obtained.

3. The method for determining the amount of VOCs waste gas to be co-treated by the petrochemical heating furnace according to claim 1, characterized in that, The simulation results parameters include: wall temperature, pollutant emissions, VOCs treatment rate, thermal efficiency, and tube outlet temperature at different mixing ratios.

4. The method for determining the amount of VOCs waste gas to be co-treated by the petrochemical heating furnace according to claim 1, characterized in that, The physical property parameters include: calorific value, energy density, and elemental content.

5. The method for determining the amount of VOCs waste gas to be co-treated by the petrochemical heating furnace according to claim 1, characterized in that, The flame conditions include: flame shape, flame size, and flame temperature; The pollutant emission information includes: the amount of pollutants emitted.

6. A method for treating VOCs waste gas in conjunction with a petrochemical heating furnace, characterized in that, The method for co-treating VOCs waste gas in the petrochemical heating furnace includes: A reasonable blending ratio is obtained; the reasonable blending ratio is obtained by the method for determining the amount of VOCs waste gas to be co-treated by the petrochemical heating furnace as described in any one of claims 1-5; According to the reasonable mixing ratio, the VOCs waste gas is mixed with air and then introduced into the working petrochemical heating furnace.

7. The method for treating VOCs waste gas in conjunction with a petrochemical heating furnace according to claim 6, characterized in that, According to the aforementioned reasonable mixing ratio, the VOCs waste gas is mixed with air and then introduced into the operating petrochemical heating furnace, specifically including: According to the reasonable mixing ratio, VOCs waste gas is mixed with air to obtain a mixed gas; The mixed gas is delivered from the air inlet or a dedicated gas line of the petrochemical heating furnace into the working petrochemical heating furnace.

8. A treatment device for co-treating VOCs waste gas in a petrochemical heating furnace, characterized in that, The treatment equipment for co-processing VOCs waste gas in the petrochemical heating furnace includes: a petrochemical heating furnace; The petrochemical heating furnace is equipped with a dedicated gas passage; The dedicated gas path is used to mix VOCs waste gas with air according to a reasonable mixing ratio and then introduce it into the petrochemical heating furnace in operation; the reasonable mixing ratio is obtained by the method for determining the amount of VOCs waste gas to be co-treated by the petrochemical heating furnace according to any one of claims 1-5.

9. The treatment equipment for co-treating VOCs waste gas in a petrochemical heating furnace according to claim 8, characterized in that, The dedicated gas passage is located at the bottom or wall of the petrochemical heating furnace.

10. The treatment equipment for co-treating VOCs waste gas in a petrochemical heating furnace according to claim 8, characterized in that, The dedicated gas passage is located at the bottom of the furnace, on the burner, or on the wall of the radiation chamber of the petrochemical heating furnace.

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