Method for determining amount of VOCs waste gas cooperatively processed by petrochemical heating furnace and processing method

Abstract

The invention discloses a method for determining the amount of VOCs waste gas cooperatively treated by a petrochemical heating furnace and a treatment method, and relates to the technical field of petrochemical engineering, the amount of the VOCs waste gas cooperatively treated is firstly determined, and then the VOCs waste gas with the corresponding mixing ratio is introduced into the petrochemical heating furnace in work based on the determination result. As the petrochemical heating furnace in work is burning to release heat, VOCs waste gas does not need to be concentrated, fuel gas does not need to be additionally added, and therefore cost and energy consumption are reduced. The VOCs waste gas can be treated by utilizing energy generated by combustion heat release of fuel gas in an existing petrochemical heating furnace, so that emission is reduced, concentration equipment and a combustion furnace do not need to be additionally arranged, low-concentration VOCs waste gas treatment can be performed, combustion-supporting fuel does not need to be added, resources are saved, and energy waste is reduced.

Description

Technical Field

[0001] The present application relates to the field of petrochemical technology, and in particular to a method for determining and treating the amount of VOCs waste gas that is collaboratively treated by a petrochemical heating furnace. Background Art

[0002] With the acceleration of industrialization and urbanization, air pollution characterized by high concentrations of ozone (O3) and fine particulate matter (PM2.5) is becoming increasingly serious in my country. VOCs (Volatile Organic Compounds) waste gas is a precursor of O3 and PM2.5 pollution, and the demand for VOCs waste gas emission control is growing.

[0003] 56% of VOCs gas emissions come from industrial sources, of which VOCs waste gas emissions from the petrochemical industry account for 40% of industrial sources. Therefore, controlling VOCs waste gas emissions from the petrochemical industry is crucial to improving the environment.

[0004] At present, there are various methods for treating VOCs waste gas, mainly including adsorption, absorption, thermal destruction (including RTO, RCO, etc.), condensation recovery, microbial degradation, membrane separation, catalytic oxidation, etc. In the petrochemical industry, RTO, RCO and other combustion methods are mainly used to treat VOCs waste gas. Since petrochemical VOCs waste gas mainly comes from unorganized emissions in oil and gas storage tank areas, loading and unloading areas, solid / liquid waste treatment areas and other areas, the VOCs content in the waste gas is low and cannot be burned autonomously. Therefore, when using RTO or RCO and other combustion methods to reduce VOCs waste gas emissions, it is often necessary to concentrate the VOCs waste gas before combustion, and add fuel gas during the combustion process to maintain the combustion state. This method reduces VOCs waste gas emissions, but increases costs, energy consumption, carbon emissions and land. Summary of the invention

[0005] The purpose of this application is to provide a method for determining and treating the amount of VOCs waste gas that is co-treated by a petrochemical heating furnace, which does not require additional waste gas concentration when performing VOCs waste gas emission reduction treatment, and does not require additional fuel gas addition, thereby reducing costs and energy consumption.

[0006] To achieve the above objectives, this application provides the following solutions:

[0007] In a first aspect, the present application provides a method for determining the amount of VOCs waste gas that is co-processed by a petrochemical heating furnace, the method comprising:

[0008] Prepare laboratory gas with the same physical property parameters as VOCs to obtain VOCs fitting gas;

[0009] Obtaining the initial flame push speed and blow-out limit after the mixed gas with different mixing ratios is introduced into the combustion-supporting side of the coaxial jet experimental platform, and obtaining the first experimental results with different mixing ratios; the mixed gas is the gas obtained by mixing the VOCs fitting gas with air;

[0010] According to the first experimental results of different blending ratios, a blending ratio range that can enhance flame stability is determined to obtain a first applicable range; the enhancement of flame stability means that the initial flame push speed and the corresponding fuel fitting gas flow rate at the blow-off limit are increased compared to when the blending ratio is zero;

[0011] Obtaining flame conditions and pollutant emission conditions after the mixed gas with different mixing ratios within the first applicable range is introduced into the combustion-supporting gas side of the coaxial jet experimental platform, and obtaining second experimental results with different mixing ratios;

[0012] The second applicable range is obtained by obtaining a mixing ratio range in which the difference between the second experimental result of the different mixing ratios and the preset experimental result is less than the preset threshold; the preset experimental result is the flame condition and pollutant emission condition after the mixed gas with a mixing ratio of zero is introduced into the combustion-supporting gas side of the coaxial jet experimental platform;

[0013] Using mixed gases with different blending ratios within the second applicable range to perform simulated combustion simulation, and obtain simulation result parameters;

[0014] A reasonable blending ratio is determined according to the simulation result parameters; the reasonable blending ratio is the VOCs waste gas treatment amount.

[0015] Optionally, the obtaining of the initial flame push speed and the blow-out limit after the mixed gas with different mixing ratios is introduced into the combustion-supporting gas side of the coaxial jet experimental platform to obtain the first experimental results with different mixing ratios specifically includes:

[0016] Pass the fuel-fitting gas into the fuel side of the coaxial jet experimental platform;

[0017] The mixed gases with different mixing ratios are introduced into the combustion-supporting gas side of the coaxial jet experimental platform;

[0018] The initial flame push speed and blow-out limit are obtained after the mixed gases with different mixing ratios are introduced into the combustion-supporting gas side of the coaxial jet experimental platform, and the first experimental results with different mixing ratios are obtained.

[0019] Optionally, the simulation result parameters include: baffle wall temperature, pollutant emissions, VOCs treatment rate, thermal efficiency and pipe outlet temperature at different mixing ratios.

[0020] Optionally, the physical property parameters include: calorific value, energy density and element content.

[0021] Optionally, the flame conditions include: flame shape, flame size and flame temperature;

[0022] The pollutant emission situation includes: pollutant emission amount.

[0023] In a second aspect, the present application provides a method for co-processing VOCs waste gas with a petrochemical heating furnace, characterized in that the method for co-processing VOCs waste gas with a petrochemical heating furnace comprises:

[0024] Obtaining a reasonable blending ratio; the reasonable blending ratio is obtained by the method for determining the amount of VOCs waste gas to be processed by a petrochemical heating furnace as described in any one of the above items;

[0025] The VOCs waste gas is mixed with air according to the reasonable blending ratio and then introduced into the working petrochemical heating furnace.

[0026] Optionally, the VOCs waste gas is mixed with air according to the reasonable blending ratio and then introduced into a petrochemical heating furnace in operation, specifically comprising:

[0027] Mixing the VOCs waste gas with air according to the reasonable blending ratio to obtain a mixed gas;

[0028] The mixed gas is transported from the air inlet of the petrochemical heating furnace or a dedicated gas path to the inside of the working petrochemical heating furnace.

[0029] In a third aspect, the present application provides a treatment device for co-processing VOCs waste gas with a petrochemical heating furnace, characterized in that the treatment device for co-processing VOCs waste gas with a petrochemical heating furnace comprises: a petrochemical heating furnace;

[0030] The petrochemical heating furnace is provided with a dedicated gas circuit;

[0031] The dedicated gas circuit is used to mix the VOCs waste gas with air according to a reasonable mixing ratio and then pass it into the working petrochemical heating furnace; the reasonable mixing ratio is obtained by the method for determining the amount of VOCs waste gas that can be collaboratively processed by the petrochemical heating furnace described in any of the above items.

[0032] Optionally, the dedicated gas circuit is arranged at the bottom or wall of the petrochemical heating furnace.

[0033] Optionally, the dedicated gas path is arranged at the bottom of the furnace, on the burner or on the wall of the radiation chamber of the petrochemical heating furnace.

[0034] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0035] The present application provides a method for determining the amount of VOCs waste gas that is co-processed by a petrochemical heating furnace and a method for processing the same. First, the amount of VOCs waste gas that is co-processed is determined, and then the VOCs waste gas of the corresponding blending ratio is introduced into the working petrochemical heating furnace based on the determination result. Since the working petrochemical heating furnace is burning and releasing heat, there is no need to concentrate the VOCs waste gas, nor is there any need to add additional fuel gas, thereby reducing costs and energy consumption. The present application can utilize the energy generated by the combustion and heat release of fuel gas in the existing petrochemical heating furnace to process VOCs waste gas, thereby reducing emissions. No external concentration equipment and combustion furnace are required, and low-concentration VOCs waste gas treatment can be performed without the need to add combustion-supporting fuel, thereby saving resources and reducing energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A schematic flow chart of a method for determining the amount of VOCs waste gas to be processed in a petrochemical heating furnace in cooperation with an embodiment of the present application;

[0038] Figure 2 A schematic flow chart of a method for co-processing VOCs waste gas using a petrochemical heating furnace provided in one embodiment of the present application.

[0039] Figure 3 A schematic diagram of a burner air side introduction method provided in an embodiment of the present application;

[0040] Figure 4 A schematic diagram of a separate access method at the furnace bottom provided in an embodiment of the present application;

[0041] Figure 5 A schematic diagram of a separate access method through a wall provided in one embodiment of the present application.

[0042] Reference numerals:

[0043] 1-heating furnace, 2-furnace tube, 3-burner, 4-burner shell, 5-fuel pipe, 6-VOCs waste gas delivery pipe. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] The present application provides a VOCs waste gas treatment process with low operating cost, suitable for treating low concentrations, simple and efficient, and provides a matching applicability evaluation method to ensure the reliable operation of the process and has very good application prospects. Its purpose is to solve the shortcomings of traditional treatment methods for volatile organic compounds (VOCs), thereby providing a VOCs waste gas treatment process with low operating cost, suitable for treating low concentrations, simple and efficient, and its applicability evaluation method.

[0046] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0047] In another exemplary embodiment, Figure 1 As shown, a method for determining the amount of VOCs waste gas co-processed by a petrochemical heating furnace is provided, comprising:

[0048] A1. Prepare laboratory gas with the same physical property parameters as those of VOCs to obtain VOCs fitting gas. The physical property parameters include: calorific value, energy density and element content.

[0049] In this embodiment, the experimental gas is prepared: through relevant detection instruments, the calorific value, energy density, element content and other physical quantities of the fuel gas and VOCs waste gas are determined as target parameters, and laboratory gases with similar physical quantities to the above-mentioned fuel gas and VOCs waste gas are prepared through one or more gases, namely, fuel fitting gas and VOCs fitting gas.

[0050] A2. Obtain the initial flame push speed and blow-out limit after the mixed gas with different mixing ratios is introduced into the combustion-supporting gas side of the coaxial jet experimental platform, and obtain the first experimental results with different mixing ratios; the mixed gas is the gas obtained by mixing the VOCs fitting gas with air.

[0051] In this embodiment, a combustion experiment is first performed when the VOCs waste gas mixing ratio is 0:

[0052] First, the prepared fuel and gas are introduced into the fuel side of the coaxial jet experimental platform, and a certain amount of air is introduced into the combustion-supporting gas side for combustion-supporting. The excess air coefficient must be consistent with the project.

[0053] Then, by adjusting the flow rate of fuel and gas, observe and record the flame morphology.

[0054] Finally, by analyzing the effect of the fuel fitting gas flow rate on the flame morphology, the initial flame push speed and blow-out limit are obtained. As the flow rate of the fuel fitting gas increases, the flame will gradually lengthen from a short attached flame, and then when the fuel fitting gas flow rate reaches a certain value, the flame will change from an attached flame to a push-out flame. At this time, the fuel gas flow rate is the initial flame push speed. As the fuel gas flow rate continues to increase, the flame push height (the distance from the fuel gas outlet to the bottom of the flame) will gradually increase until it is extinguished. The fuel gas flow rate when the flame is extinguished is the flame blow-out limit.

[0055] Then the VOCs waste gas co-combustion experiment was carried out:

[0056] First, the prepared fuel-fitting gas is introduced into the fuel side of the coaxial jet experimental platform (this experimental platform is an experimental platform for studying the characteristics of diffusion flames. It only conducts flame characteristic research and does not simulate the actual petrochemical heating furnace). The prepared VOCs-fitting gas is mixed with air at a certain mixing ratio and then introduced into the combustion-supporting gas side of the coaxial jet experimental platform. The mixing ratio ranges from 0 to 25% of the lower explosion limit, and the excess air coefficient is consistent with the above.

[0057] Then, under different mixing ratio conditions, the flow rate of the fuel-fitting gas was adjusted, and the flame morphology at different flow rates was recorded;

[0058] Finally, by analyzing the effect of flow rate on flame morphology at different mixing ratios, the flame push speed and blow-out limit at different mixing ratios are obtained. The analysis process is: the flame morphology at different fuel gas flow rates under different mixing ratios is recorded by a high-speed camera, and the flame push speed and blow-out limit speed at different mixing ratios are obtained by analyzing the flame morphology.

[0059] A3. Determine the mixing ratio range that can enhance flame stability based on the first experimental results of different mixing ratios to obtain a first applicable range; the enhancement of flame stability means that the initial flame push speed and the corresponding fuel fitting air flow rate at the blow-off limit are increased compared to when the mixing ratio is zero.

[0060] In this example, the influence of VOCs exhaust gas mixing ratio on combustion stability is determined as follows:

[0061] Firstly, based on the above experimental results, the curves of the initial flame push speed and the blow-out limit changing with the mixing ratio were plotted.

[0062] Then, the influence of VOCs mixing ratio on flame stability is determined by analyzing the change curve. If the initial flame push speed and the fuel gas flow corresponding to the blow-out limit at a non-zero mixing ratio are higher than those at no mixing (i.e., the mixing ratio is zero), it means that the mixing ratio enhances the flame stability. Otherwise, it means that the mixing ratio weakens the flame stability.

[0063] Finally, the blending ratio that enhances flame stability is selected as the value of the first applicable range for the blended combustion of VOCs waste gas.

[0064] A4. Obtain the flame conditions and pollutant emission conditions after the mixed gases with different mixing ratios within the first applicable range are introduced into the combustion-supporting gas side of the coaxial jet experimental platform, and obtain the second experimental results with different mixing ratios.

[0065] A5. Obtain the mixing ratio range corresponding to which the difference between the second experimental result of the different mixing ratios and the preset experimental result is less than the preset threshold, and obtain the second applicable range; the preset experimental result is the flame condition and pollutant emission condition after the 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.

[0066] In this example, the influence of the VOCs exhaust gas mixing ratio on the combustion state is determined as follows:

[0067] Firstly, based on the above experimental device, the fuel fitting gas flow rate is set according to the maximum value of the fuel fitting gas flow rate in the initial flame push state under different blending ratios within the above first applicable range.

[0068] Secondly, the combustion experiment is carried out under the condition that the excess air coefficient is consistent with the above.

[0069] Then, the flame shape, flame size, flame temperature and pollutant emissions under different mixing ratios were recorded, and the relationship curve between the above-mentioned dependent variables and the VOCs mixing ratio was plotted.

[0070] Finally, the above relationship curve is analyzed, and the blending ratio when the difference of the dependent variable is no more than 5% compared with the case of no blending is taken as the second applicable range value.

[0071] A6. Perform a simulated combustion simulation using mixed gases with different blending ratios within the second applicable range to obtain simulation result parameters. The simulation result parameters include: baffle wall temperature, pollutant emissions, VOCs treatment rate, thermal efficiency, and tube outlet temperature at different blending ratios.

[0072] The VOCs waste gas combustion simulation in this embodiment includes:

[0073] Firstly, a numerical simulation model is established with reference to the target petrochemical heating furnace; the model is established by using CFD (Computational FluidDynamics) numerical simulation software.

[0074] Then, with reference to the engineering operating parameters, simulation calculations were carried out when there was no VOCs blending, and parameters such as retaining wall temperature, pollutant emissions, VOCs treatment rate, thermal efficiency, and pipe outlet temperature were statistically analyzed and compared with the engineering data to verify the reliability of the model.

[0075] Finally, within the second applicable range, simulation calculations of different mixing ratios are performed from large to small, and parameters such as retaining wall temperature, pollutant emissions, VOCs treatment rate, thermal efficiency, and pipe outlet temperature at different mixing ratios are statistically analyzed.

[0076] A7. Determine a reasonable blending ratio based on the simulation result parameters; the reasonable blending ratio is the VOCs waste gas treatment amount.

[0077] In this embodiment, the amount of VOCs waste gas treated and the operating parameters are determined as follows:

[0078] First, determine whether the tube outlet temperature obtained in the above simulation process meets the process requirements. If so, proceed to the next step of judgment; otherwise, reduce the VOCs blending ratio and re-judge.

[0079] Secondly, determine whether the VOCs treatment rate R is not less than 95%. If so, proceed to the next step. Otherwise, reduce the VOCs mixing ratio and repeat the first step. The calculation formula of the VOCs treatment rate R is as follows:

[0080] R = (C0-C1) / C0×100%;

[0081] Where: R is the VOCs treatment rate, C0 is the VOCs waste gas concentration when the reference oxygen content is 3% before combustion, and C1 is the VOCs waste gas concentration when the reference oxygen content is 3% after combustion;

[0082] Then, determine whether the pollutant emissions meet local emission standards, whether the retaining wall temperature and thermal efficiency meet satisfactory requirements. If so, determine that the mixing ratio is the maximum processing capacity and operating parameters allowed when the petrochemical heating furnace coordinates the treatment of VOCs. Otherwise, reduce the VOCs mixing ratio and repeat the first step of judgment.

[0083] In an exemplary embodiment, Figure 2 As shown, a method for co-processing VOCs waste gas with a petrochemical heating furnace is provided, comprising:

[0084] S1. Obtaining a reasonable blending ratio; the reasonable blending ratio is obtained by the method for determining the amount of VOCs waste gas co-processed by a petrochemical heating furnace as described above;

[0085] S2. Mix the VOCs waste gas with air according to the reasonable blending ratio and then introduce it into the working petrochemical heating furnace.

[0086] The VOCs waste gas is mixed with air according to the reasonable mixing ratio and then introduced into the petrochemical heating furnace in operation, specifically including:

[0087] Mixing the VOCs waste gas with air according to the reasonable blending ratio to obtain a mixed gas;

[0088] The mixed gas is transported from the air inlet of the petrochemical heating furnace or a dedicated gas path to the inside of the working petrochemical heating furnace.

[0089] As an optional implementation, Figure 3 , Figure 4 and Figure 5 As shown, this embodiment divides the access methods into three types according to different parts:

[0090] Figure 3 The VOCs waste gas is introduced into the burner air side of the heating furnace 1 through the VOCs waste gas delivery pipe 6 together with the burner air. Figure 4 The VOCs waste gas is introduced into the bottom of the heating furnace 1 through the VOCs waste gas conveying pipe 6 from the bottom of the heating furnace 1 alone. Figure 5 The VOCs waste gas is introduced into the wall of the heating furnace 1 from the wall of the radiation chamber of the heating furnace 1 through the VOCs waste gas conveying pipe 6.

[0091] During operation, the fuel gas will be sprayed into the radiation chamber of the heating furnace 1 through the fuel pipe 5, and will be burned and released heat under the combustion-supporting effect of the air. After combustion, a slight negative pressure will be formed in the furnace. Under the effect of the pressure drop, the air will enter the heating furnace 1 from the burner 3 to maintain the combustion-supporting environment. The fuel gas is the fuel required for conventional combustion of 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.

[0092] When VOCs waste gas needs to be co-treated, one or more of the three co-treatment methods can be selected, and 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 and destruction occur under the heat release of fuel gas combustion.

[0093] Based on the same inventive concept, an embodiment of the present application further provides a treatment device for co-processing VOCs waste gas with a petrochemical heating furnace, and the treatment device for co-processing VOCs waste gas with a petrochemical heating furnace includes: a petrochemical heating furnace.

[0094] The petrochemical heating furnace is provided with a dedicated gas circuit.

[0095] The dedicated gas circuit is used to mix the VOCs waste gas with air according to a reasonable mixing ratio and then pass it into the working petrochemical heating furnace; the reasonable mixing ratio is obtained by the method for determining the amount of VOCs waste gas that is collaboratively processed by the petrochemical heating furnace as described above.

[0096] Wherein, the dedicated gas path is arranged at the bottom or wall of the petrochemical heating furnace.

[0097] Specifically, the dedicated gas path is arranged at the bottom of the furnace, on the burner or at the wall of the radiation chamber of the petrochemical heating furnace.

[0098] In an exemplary embodiment, a method for collaboratively treating VOCs waste gas in a petrochemical heating furnace and evaluating its suitability is provided. The method relies on the combustion characteristics of the petrochemical heating furnace itself to perform VOCs waste gas combustion treatment, and mainly includes three collaborative treatment methods: introduction from the air side of the burner, separate introduction at the bottom of the furnace, and separate introduction at the wall.

[0099] Among them: air side introduction refers to the method in which VOCs waste gas is mixed with the combustion-supporting air of the heating furnace and then transported from the air inlet of the heating furnace to the inside of the heating furnace.

[0100] Among them: separate introduction at the furnace bottom refers to the method in which VOCs waste gas is transported from the bottom of the heating furnace to the inside of the heating furnace through a dedicated gas path. The gas path can be located at the bottom of the furnace or on the burner.

[0101] Among them: separate introduction at the wall refers to the method in which VOCs waste gas is transported from the wall of the heating furnace radiation room to the inside of the heating furnace through a dedicated gas path.

[0102] The applicability evaluation method includes: preparing experimental gas, laboratory combustion experiment, VOCs waste gas co-combustion simulation, and co-processing of VOCs waste gas treatment volume and operation parameter determination.

[0103] Among them: preparing experimental gas means simplifying the complex composition of fuel gas and VOCs waste gas into a mixed gas of one or several gases according to physical quantities such as calorific value, energy density, and element content as target parameters.

[0104] Among them: laboratory combustion experiments, including combustion experiments without VOCs waste gas mixing, VOCs waste gas mixing experiments, the influence of VOCs waste gas mixing ratio on combustion stability, and the influence of VOCs waste gas mixing ratio on combustion state, refer to studying the influence of VOCs waste gas mixing on combustion stability (including: initial flame propulsion speed and extinction limit) and combustion state (including: flame shape, flame size, flame temperature and pollutant emissions, etc.) through a coaxial jet experimental platform, so as to preliminarily determine the applicable scope of the mixing ratio when co-treating VOCs waste gas.

[0105] Among them: VOCs waste gas co-combustion simulation refers to the simulation of the operating status of the petrochemical heating furnace when co-treating VOCs waste gas based on CFD numerical simulation technology (including: retaining wall temperature, pollutant emissions, VOCs treatment rate, thermal efficiency, pipe outlet temperature, etc.).

[0106] Among them: the determination of the treatment volume and operating parameters of the synergistic treatment of VOCs waste gas refers to comparing the simulation results of VOCs waste gas co-combustion with the process requirements and relevant policy requirements to determine the final synergistic treatment volume and operating parameters of VOCs waste gas.

[0107] The beneficial effects of the present invention are as follows: it can utilize the heat released by the combustion of fuel gas in the existing petrochemical heating furnace to treat VOCs waste gas, thereby reducing emissions, without the need for additional concentration equipment and combustion furnaces, and can treat low-concentration VOCs waste gas without adding combustion-supporting fuel, thus saving resources and reducing energy waste.

[0108] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0109] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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.

[0110] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A method for determining the amount of VOCs waste gas co-processed by a petrochemical heating furnace, characterized in that: The method for determining the amount of VOCs waste gas processed by the petrochemical heating furnace includes: Prepare laboratory gas with the same physical property parameters as VOCs to obtain VOCs fitting gas; Obtaining the initial flame push speed and blow-out limit after the mixed gas with different mixing ratios is introduced into the combustion-supporting side of the coaxial jet experimental platform, and obtaining the first experimental results with different mixing ratios; the mixed gas is the gas obtained by mixing the VOCs fitting gas with air; According to the first experimental results of different blending ratios, a blending ratio range that can enhance flame stability is determined to obtain a first applicable range; the enhancement of flame stability means that the initial flame push speed and the corresponding fuel fitting gas flow rate at the blow-off limit are increased compared to when the blending ratio is zero; Obtaining flame conditions and pollutant emission conditions after the mixed gas with different mixing ratios within the first applicable range is introduced into the combustion-supporting gas side of the coaxial jet experimental platform, and obtaining second experimental results with different mixing ratios; The second applicable range is obtained by obtaining a mixing ratio range in which the difference between the second experimental result of the different mixing ratios and the preset experimental result is less than the preset threshold; the preset experimental result is the flame condition and pollutant emission condition after the mixed gas with a mixing ratio of zero is introduced into the combustion-supporting gas side of the coaxial jet experimental platform; Using mixed gases with different blending ratios within the second applicable range to perform simulated combustion simulation, and obtain simulation result parameters; A reasonable blending ratio is determined according to the simulation result parameters; the reasonable blending ratio is the VOCs waste gas treatment amount.

2. The method for determining the amount of VOCs waste gas processed by a petrochemical heating furnace according to claim 1 is characterized in that: The method of obtaining the initial flame push speed and the blow-out limit after the mixed gas with different mixing ratios is introduced into the combustion-supporting gas side of the coaxial jet experimental platform to obtain the first experimental results with different mixing ratios specifically includes: Pass the fuel-fitting gas into the fuel side of the coaxial jet experimental platform; The mixed gases with different mixing ratios are introduced into the combustion-supporting gas side of the coaxial jet experimental platform; The initial flame push speed and blow-out limit are obtained after the mixed gases with different mixing ratios are introduced into the combustion-supporting gas side of the coaxial jet experimental platform, and the first experimental results with different mixing ratios are obtained.

3. The method for determining the amount of VOCs waste gas processed by a petrochemical heating furnace according to claim 1, characterized in that: The simulation result parameters include: retaining wall temperature, pollutant emission, VOCs treatment rate, thermal efficiency and pipe outlet temperature at different mixing ratios.

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

5. The method for determining the amount of VOCs waste gas processed by a petrochemical heating furnace according to claim 1, characterized in that: The flame conditions include: flame shape, flame size and flame temperature; The pollutant emission situation includes: pollutant emission amount.

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

7. The method for co-processing VOCs waste gas with a petrochemical heating furnace according to claim 6, characterized in that: The VOCs waste gas is mixed with air according to the reasonable mixing ratio and then introduced into the petrochemical heating furnace in operation, specifically including: Mixing the VOCs waste gas with air according to the reasonable blending ratio to obtain a mixed gas; The mixed gas is transported from the air inlet of the petrochemical heating furnace or a dedicated gas path to the inside of the working petrochemical heating furnace.

8. A treatment device for VOCs waste gas in a petrochemical heating furnace, characterized in that: The processing equipment for co-processing VOCs waste gas with a petrochemical heating furnace comprises: a petrochemical heating furnace; The petrochemical heating furnace is provided with a dedicated gas circuit; The dedicated gas circuit is used to mix the VOCs waste gas with air according to a reasonable mixing ratio and then pass it into the working petrochemical heating furnace; the reasonable mixing ratio is obtained by the method for determining the amount of VOCs waste gas collaboratively processed by the petrochemical heating furnace described in any one of claims 1-5.

9. The processing equipment for co-processing VOCs waste gas with a petrochemical heating furnace according to claim 8 is characterized in that: The dedicated gas path is arranged at the furnace bottom or the wall of the petrochemical heating furnace.

10. The processing equipment for co-processing VOCs waste gas with a petrochemical heating furnace according to claim 8, characterized in that: The dedicated gas path is arranged at the bottom of the furnace, on the burner or at the wall of the radiation chamber of the petrochemical heating furnace.

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