Gas fuel combustion chamber pollutant emission rule analysis method and system

Abstract

The invention discloses a gas fuel combustion chamber pollutant emission rule analysis method and system. The method comprises the steps that a combustion chamber CFD model is built according to structure parameters of a combustion chamber; performing flow field calculation according to the CFD model constructed in the step 1, and correcting the obtained flow field characteristics until the flow field characteristics meet requirements; constructing a chemical reactor network model, and performing combustion area division on the chemical reactor network model according to the flow field characteristics; then simulating the chemical reactor network model, determining a pollutant discharge rule according to a simulation result, updating the chemical reactor network model according to the pollutant discharge rule until the pollutant discharge rule meets the requirement, and obtaining a final chemical reactor network model; and according to the final chemical reactor network model, carrying out pollutant emission rule prediction. According to the pollutant emission rule analysis method, the pollutant emission rule of the gas fuel combustion chamber can be quickly predicted, and the improvement of a low-pollution combustion technology and the control of pollutant emission are guided.

Description

Technical Field

[0001] The present invention relates to the technical field of pollutant emission law research, and in particular to a method and system for analyzing pollutant emission laws in a gas fuel combustion chamber. Background Art

[0002] Pollutant emissions are one of the important technical indicators for evaluating the performance of the combustion chamber. To reduce pollutant emissions as much as possible without affecting efficiency and unit safety, it is necessary to understand the pollutant emission laws of the combustion chamber under high temperature and high pressure environments, and provide a reference for the improvement of low-pollution combustion technology and the control of pollutant emissions.

[0003] The analysis of pollutant emission rules usually adopts empirical-semi-empirical model method or CFD simulation method. The establishment of empirical-semi-empirical model method requires a large amount of experimental data, and the experimental process has defects such as long cycle and high cost. Therefore, the establishment of empirical-semi-empirical model method is relatively complicated. In addition, the empirical-semi-empirical model method is only for specific combustion chamber sizes and combustion systems, and is not suitable for predicting pollutant emission characteristics of other combustion chambers. There are obvious limitations in the scope of application. In the CFD simulation method, there is a highly nonlinear relationship between its energy equation, momentum equation and component transport equation in simulating the flow field characteristics and combustion process of the combustion chamber. At the same time, solving the fluid dynamics equation and chemical reaction kinetics equation requires a lot of computing resources. Due to the limitation of the amount of calculation, the CFD numerical simulation method usually adopts a simplified chemical reaction mechanism, which is insufficient in terms of calculation time and prediction of pollutant emission characteristics. Therefore, the performance of the combustion chamber cannot be accurately evaluated based on the predicted pollutant emission characteristics, which affects the optimization process of combustion adjustment of the combustion chamber. Summary of the invention

[0004] In order to quickly predict the pollutant emission law of gas fuel combustion chambers and guide the improvement of low-pollution combustion technology and the control of pollutant emissions, the present invention provides a gas fuel combustion chamber pollutant emission law analysis method, which obtains the combustion chamber pollutant emission law through numerical research and provides a theoretical basis for combustion adjustment of the combustion chamber.

[0005] The present invention is achieved through the following technical solutions:

[0006] A method for analyzing the emission rules of pollutants from a gas fuel combustion chamber comprises the following steps:

[0007] Step 1: Construct a combustion chamber CFD model according to the structural parameters of the combustion chamber;

[0008] Step 2: Calculate the flow field according to the CFD model constructed in step 1, and modify the obtained flow field characteristics until the flow field characteristics meet the requirements;

[0009] Step 3, constructing a chemical reactor network model, and dividing the chemical reactor network model into combustion areas according to flow field characteristics;

[0010] Step 4: simulate the chemical reactor network model, determine the pollutant emission law based on the simulation results, and update the chemical reactor network model according to the pollutant emission law until the pollutant emission law meets the requirements, obtain the final chemical reactor network model, and predict the pollutant emission law based on the final chemical reactor network model.

[0011] Preferably, when the combustion chamber is a branch pipe or annular pipe combustion chamber, the combustion chamber of the combustion chamber CFD model is a branch pipe structure or annular pipe structure; when the combustion chamber is an annular combustion chamber, the combustion chamber of the combustion chamber CFD model has a fan-shaped structure.

[0012] Preferably, the method for constructing the combustion chamber CFD model is as follows:

[0013] S1.1. Establish a three-dimensional model of the combustion chamber according to the parameters of the combustion chamber, and divide the three-dimensional model into grids;

[0014] S1.2, determining the boundary conditions of the three-dimensional model of the combustion chamber according to the operating parameters of the combustion chamber;

[0015] S1.3. Set the calculation model and chemical reaction mechanism of the combustion chamber three-dimensional model to obtain the combustion chamber CFD model.

[0016] Preferably, the flow field characteristics in step 2 include temperature field, velocity field, pressure field and pollutant concentration field.

[0017] Preferably, the method for correcting the flow field characteristics in step 2 is as follows:

[0018] The flow field characteristics obtained by fluid dynamics calculation are compared with the flow field characteristics obtained by theoretical calculation and / or experiment under the same combustion conditions. When the flow field characteristics are different, the combustion chamber model structure, the grid parameters and / or fluid simulation parameters of the combustion chamber model are adjusted, and the fluid dynamics calculation is performed again until the obtained flow field characteristics are consistent with the flow field characteristics obtained by theoretical calculation and / or experiment.

[0019] Preferably, the region division method of the chemical reactor network model in step 3 is as follows:

[0020] The chemical reactor network model is divided into mixing zone, recirculation zone, flame zone and post-flame zone according to the flow field characteristics, and the reactor in each zone is determined according to the relative value between the turbulent flow time and the chemical reaction time of each zone.

[0021] Preferably, the mixing zone is a fully mixed flow reactor; the reflux zone and the flame zone are fully mixed flow reactors; and the combustion chamber is a plug flow reactor.

[0022] Preferably, the method for updating the chemical reactor network model in step 4 is as follows:

[0023] The pollutant emission patterns obtained by simulation are compared with those obtained by theoretical calculation and / or experiment. When the pollutant emission patterns are different, the chemical reactor network model is adjusted and re-simulated until the pollutant emission patterns meet the requirements. The last updated chemical reactor network model is used as the final chemical reactor network model to predict pollutant emission patterns.

[0024] A system for analyzing the emission rules of pollutants in a gas fuel combustion chamber, comprising:

[0025] A model building module, used to build a combustion chamber CFD model according to the structural parameters of the combustion chamber;

[0026] The simulation module is used to calculate the flow field according to the constructed CFD model and to modify the obtained flow field characteristics until the flow field characteristics meet the requirements;

[0027] A chemical network model building module is used to build a chemical reactor network model and divide the chemical reactor network model into combustion areas according to flow field characteristics;

[0028] The prediction module is used to simulate the chemical reactor network model, determine the pollutant emission law according to the simulation results, and update the chemical reactor network model according to the pollutant emission law until the pollutant emission law meets the requirements, thereby obtaining the final chemical reactor network model, and predicting the pollutant emission law based on the final chemical reactor network model.

[0029] A computer device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method for analyzing the emission regularity of pollutants in a gas fuel combustion chamber when executing the computer program.

[0030] Compared with the prior art, the present invention has the following beneficial technical effects:

[0031] The present invention provides a method for analyzing the emission patterns of pollutants in a gas fuel combustion chamber. First, a CFD model of a gas fuel combustion chamber is constructed to calculate the flow field, and flow field characteristics such as the temperature field and velocity field of the combustion chamber are obtained. Then, the combustion chamber is divided into regions according to the flow field characteristic parameters and the division criteria, and the network reactor corresponding to each region of the combustion chamber is selected. According to the calculation conditions and the gas fuel components, a suitable chemical reaction mechanism is selected to construct a chemical reactor network model. Through the chemical reactor network model, the influence of key parameters on pollutant emissions under the calculation conditions is obtained. The proposed pollutant emission law analysis method can quickly predict the pollutant emission patterns of gas fuel combustion chambers, and guide the improvement of low-pollution combustion technology and the control of pollutant emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The present invention is a flow chart of the method for analyzing the emission rules of pollutants in a gas fuel combustion chamber.

[0033] Figure 2 It is a regional division diagram of the combustion chamber of the present invention;

[0034] Figure 3 This is a network model diagram of the chemical reactor of the present invention. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings, which are intended to explain the present invention rather than to limit it.

[0036] A method for analyzing the emission rules of pollutants from a gas fuel combustion chamber comprises the following steps:

[0037] Step 1: Build a combustion chamber CFD model.

[0038] The CFD (Computational Fluid Dynamics) model of the combustion chamber is used to simulate and analyze the complex phenomena of gas flow, heat transfer and chemical reaction during the combustion process. For example, Fluent software provides a variety of combustion and chemical reaction models that can simulate the gas fuel combustion process and predict the formation of pollutants such as NOx and CO. When establishing and simulating the combustion chamber CFD model, it is necessary to consider turbulence models, thermal radiation models, etc. to obtain more accurate simulation results.

[0039] The method of building the combustion chamber CFD model is as follows:

[0040] S1.1. The fuel of the combustion chamber is gas fuel. For the combustion chamber to be studied, if it is a branch pipe or annular pipe combustion chamber, select one of the combustion chambers when modeling; if it is an annular combustion chamber, select the fan-shaped area of ​​the combustion chamber when modeling.

[0041] 1. For branch combustion chambers, each combustion unit (i.e. branch) can be regarded as a relatively independent system. When modeling, one of the representative branches can be selected for detailed modeling. The following should be considered during the modeling process:

[0042] Fuel and air mixing: Analyze the mixing mode of gas fuel and air (such as premixed, partially premixed or non-premixed), and the effect of mixing efficiency on the combustion process.

[0043] Combustion reaction kinetics: Establish a detailed chemical reaction kinetic model to describe the chemical reactions of the fuel under high temperature and pressure conditions in the combustion chamber, including the generation and consumption of intermediate products.

[0044] Flow field analysis: Computational fluid dynamics (CFD) methods are used to simulate the airflow in the combustion chamber, including the distribution of velocity field, temperature field and pressure field.

[0045] Heat transfer and wall effect: Consider the heat transfer between the combustion chamber wall and the high-temperature combustion gas, as well as the influence of the wall material on the combustion performance.

[0046] 2. Modeling of annular can combustion chamber

[0047] The annular combustion chamber is composed of multiple annular combustion units surrounding the central axis. When modeling, you can also select one of the annular combustion units as a representative for modeling, but please note:

[0048] Circumferential uniformity: Due to the structural characteristics of the annular can combustor, special attention should be paid to the circumferential uniformity of the combustion process to ensure that the model can reflect this feature.

[0049] Influence of adjacent combustion chambers: Although a single annular combustion unit is selected for modeling, the mutual influence of adjacent combustion chambers through shared walls or airflow disturbances should be properly considered.

[0050] Combustion stability: Analyze the combustion stability of the annular tube combustion chamber under different working conditions, including flame propagation speed, extinction limit, etc.

[0051] 3. Annular combustion chamber modeling (sector area method)

[0052] For annular combustion chambers, due to the complexity of their structure, directly modeling the entire combustion chamber often requires a huge amount of calculation. Therefore, the fan-shaped area method is often used for modeling, that is, a fan-shaped area of ​​the combustion chamber is selected as the research object. In the modeling process, it is necessary to pay attention to the following:

[0053] Selection of sector area: Make sure that the selected sector area represents the physical and chemical characteristics of the entire annular combustion chamber, and usually choose an area that contains the complete flame propagation path.

[0054] Boundary Conditions: Physical and chemical conditions on the boundaries of the sector region are correctly handled to simulate the environment in a real annular combustion chamber.

[0055] Periodic boundary conditions: Due to the periodic structure of the annular combustion chamber, periodic boundary conditions can be applied on both sides of the sector area to simulate the continuity and periodicity of the entire annular combustion chamber.

[0056] Three-dimensional effect: Although the fan-shaped region is used to simplify the model, the influence of three-dimensional effects on the combustion process still needs to be considered, such as radial and axial temperature gradients, air flow velocity distribution, etc.

[0057] S1.2. After selecting the combustion chamber, obtain its point cloud data through surveying and mapping methods. Then, based on the point cloud data, reversely construct the combustion chamber geometric model and divide the grid. According to the working conditions to be studied, combined with historical operating data and combustion chamber design information, determine the boundary conditions of the geometric model. Select relevant numerical calculation models, chemical reaction mechanisms, etc.

[0058] S1.3. The chemical reaction mechanism is selected based on the amount of combustion chamber grids. If the amount of combustion chamber grids is large, the total package reaction can be used. If the amount of combustion chamber grids is small, the simplified mechanism can be used. Generally speaking, when performing CFD model calculations, the total package reaction or simplified mechanism is selected.

[0059] Step 2: Perform fluid dynamics calculations based on the CFD model constructed in step 1, and make corrections based on the obtained flow field characteristics until the flow field characteristics meet the requirements.

[0060] The flow field calculation is performed according to the CFD model constructed in step 1. The flow field calculation refers to the distribution of the temperature field, velocity field, concentration field, etc. of the combustion chamber under the calculation conditions.

[0061] The flow field characteristics such as the combustion chamber temperature field, velocity field, and concentration field distribution obtained under the calculation conditions are used to determine the accuracy of the CFD model calculation results through theoretical analysis, test data comparison, etc. If the calculated data is inconsistent with the theoretical analysis data or the test data, the combustion chamber model structure, the grid parameters of the combustion chamber model, and / or the fluid simulation parameters are adjusted, and the simulation calculation is performed again until the obtained flow field characteristics are consistent with the flow field characteristics obtained by theoretical analysis and / or the flow field characteristics obtained by the test.

[0062] The method for theoretically calculating the flow field characteristics is to use thermodynamic calculation, heat balance calculation, and chemical reaction kinetics to obtain parameters such as combustion chamber temperature, velocity, pressure, and pollutant concentration.

[0063] The method for obtaining flow field characteristics by the test method is: through the actual unit or combustion test bench, the combustion test research is carried out under the corresponding working conditions. The combustion chamber temperature, pressure, velocity and pollutant concentration are obtained with the help of advanced test equipment.

[0064] Step 3: construct a chemical reactor network model and divide the chemical reactor network model into regions according to flow field characteristics.

[0065] The chemical reactor network model mainly includes a reactor network model and a chemical reaction mechanism. The construction of the reactor network model is mainly based on the temperature field, velocity field, etc. calculated by the combustion chamber flow field in step 2 to divide the area, and then select the corresponding reactor for the divided area; the boundary conditions of the reactor network model are determined according to the CFD model calculation results and the combustion chamber design parameters.

[0066] The chemical reaction mechanism is a detailed chemical reaction mechanism, which is verified by experimental data and is suitable for predicting the chemical reaction of gas fuel under calculation conditions.

[0067] Specifically, the chemical reactor network model is divided into mixing zone, recirculation zone, flame zone, post-flame zone, etc. The division of each zone follows the following criteria: the mixing zone is the area in the combustion chamber where no combustion occurs and only fuel and air are mixed; the recirculation zone is determined by the isosurface with an axial velocity of 0; the flame zone is determined by the isothermal surface when the flame temperature reaches 1600K; and the post-flame zone is determined by the Damköhler number (characterizing the relative size between the turbulent flow time and the chemical reaction time) Da>1.

[0068] The selection of reactors in different regions is determined by the Da number. A fully mixed flow reactor (PSR reactor) is selected for the mixing zone; the swirl in the recirculation zone and the flame zone is strong and there is a high-intensity turbulent flow, and its Da is less than 1, so a PSR reactor is selected; the turbulent flow in the post-flame zone downstream of the combustion chamber is weak, the flow field is fully developed, and the gas streamlines are consistent, Da>1, so a plug flow reactor (PFR reactor) is selected.

[0069] Step 4: Simulate the chemical reactor network model, determine the pollutant emission law according to the simulation results, and modify the pollutant emission law until the pollutant emission law meets the requirements.

[0070] The pollutant emissions mainly refer to pollutants such as NOx and CO in the combustion process.

[0071] The pollutant emission law simulation calculation is mainly based on the chemical reactor network model constructed in step 3 to perform simulation under set working conditions, and the parameter changes under the set working conditions and the influence law of pollutant emissions are obtained through simulation calculation.

[0072] Based on the method of combining theoretical analysis with experiments, the accuracy of the pollutant emission impact law obtained is analyzed. If there is a discrepancy with the theoretical analysis and experimental data, it is necessary to return to step 3, check and modify the chemical network model and recalculate until the obtained pollutant emission law meets the requirements.

[0073] Theoretical analysis is mainly based on the chemical reaction equation to predict and analyze the pollutant emission law. Test method: Carry out combustion test research under corresponding working conditions through actual units or combustion test benches. Use advanced test equipment to obtain the concentration of pollutants in the combustion chamber.

[0074] Step 5: Confirm the calculation results of pollutant emission patterns.

[0075] The pollutant emission law is the final calculated result under various working conditions predicted by the chemical reactor network model in step 4, and the operating parameters of the burner are optimized according to the pollutant emission law.

[0076] Example 1

[0077] The following is a detailed description of the specific embodiments of the present invention by taking the study of pollutant emission rules of a gas fuel combustion chamber as an example and combining with the accompanying drawings.

[0078] The working process of studying the pollutant emission law of a gas fuel combustion chamber in this embodiment is as follows:

[0079] Step 1, the fuel of a certain type of gas turbine combustion chamber is natural gas. The combustion chamber type is a branch pipe type. Select a branch pipe combustion chamber to obtain point cloud data through mapping, and then reversely construct the combustion chamber geometric model and divide the grid. According to the working conditions to be studied, combined with historical operating data and combustion chamber design data, determine the boundary conditions of the geometric model. In view of the high temperature, high pressure, high speed, high excess air coefficient, and high combustion intensity of the gas turbine combustion chamber, the turbulence model adopts the Realizable k-ε two-equation model, and the standard wall function method is used near the wall. The combustion chemical reaction mechanism uses the five-step chemical reaction of methane to simulate the chemical reaction of natural gas fuel, including the generation of pollutants such as NOx and CO.

[0080] Step 2: Calculate the flow field based on the CFD model of a branch-type combustion chamber constructed in step 1 to obtain the temperature field, velocity field, concentration field distribution, etc. of the combustion chamber under the calculation conditions. The accuracy of the CFD model calculation results is determined through theoretical analysis and experimental data comparison.

[0081] Step 3: Divide the combustion chamber into a mixing zone, a flame zone, a recirculation zone and a post-flame zone according to the temperature field and velocity field distribution calculated in step 2 and the combustion chamber zone division criteria. Figure 2 Then, according to the characteristics of each area of ​​the combustion chamber, the PSR reactor is selected for the mixing zone, reflux zone, and flame zone, and the PFR reactor is selected for the post-flame zone; and the boundary conditions of the reactor network model are determined based on the CFD model calculation results and the combustion chamber design parameters. The classic GRI-Mech3.0 methane reaction mechanism verified by experiments is used to finally form a chemical reactor network model, see Figure 3 .

[0082] Step 4: Simulation calculation and result analysis of pollutant emission patterns.

[0083] The chemical reactor network model constructed in step 3 is used for simulation under calculation conditions. The focus is on studying the influence of equivalence ratio, combustion chamber inlet pressure and flame zone residence time on the emission of pollutants such as NOx and CO. The study shows that: as the equivalence ratio increases, the concentrations of CO and NOx at the combustion chamber outlet increase; as the pressure increases, the concentrations of CO and NOx at the combustion chamber outlet decrease; as the flame zone residence time increases, the CO concentration and NOx concentration at the combustion chamber outlet increase; under lean premixed combustion conditions, the equivalence ratio has the greatest impact on the emission of combustion chamber pollutants. Finally, a combination of theoretical analysis and experiments was used to verify the accuracy of the obtained emission influence rules for pollutants such as NOx and CO.

[0084] Step 5: Confirm the influence of the equivalence ratio, combustion chamber inlet pressure and flame zone residence time verified in step 4 on the emission of pollutants such as NOx and CO under various operating conditions.

[0085] Example 2

[0086] Another aspect of the present invention provides a gas fuel combustion chamber pollutant emission law analysis system, comprising:

[0087] A model building module, used to build a combustion chamber CFD model according to the structural parameters of the combustion chamber;

[0088] The simulation module is used to calculate the flow field according to the constructed CFD model and make corrections according to the obtained flow field characteristics until the flow field characteristics meet the requirements;

[0089] A chemical network model building module is used to build a chemical reactor network model and divide the chemical reactor network model into combustion areas according to flow field characteristics;

[0090] The prediction module is used to simulate the chemical reactor network model, determine the pollutant emission law according to the simulation results, and update the chemical reactor network model according to the pollutant emission law until the pollutant emission law meets the requirements, thereby obtaining the final chemical reactor network model, and predicting the pollutant emission law based on the final chemical reactor network model.

[0091] Compared with the traditional empirical-semi-empirical model method and the traditional CFD simulation method, the gas fuel combustion chamber pollutant emission law analysis method provided by the present invention has the following significant advantages:

[0092] First, through detailed CFD modeling, including multiphase flow models, advanced turbulence models, thermal radiation models and DPM (discrete phase model), the complex physical and chemical processes in the combustion chamber can be simulated more accurately. This refined modeling makes the simulation results closer to the actual combustion situation and improves the accuracy of pollutant emission prediction. After the CFD model is calculated, the model is corrected by comparing the theoretical analysis data with the experimental data to ensure the accuracy of the flow field characteristics (such as temperature field, velocity field, concentration field), thereby improving the reliability of pollutant emission prediction.

[0093] Secondly, this method does not rely on a specific combustion chamber size or combustion system, and can be flexibly applied to different types of combustion chambers, allowing detailed simulation analysis for any given combustion chamber. By adjusting the numerical calculation model and chemical reaction mechanism (such as total package reaction or simplified mechanism), it can adapt to the needs of different grid volumes and computing resources, so that this method can achieve good application results under a variety of computing conditions.

[0094] In addition, compared with the empirical-semi-empirical model method that requires a large amount of experimental data, this method reduces the experimental requirements through detailed CFD simulation, reducing the experimental cost and time. The acquisition of experimental data is often long and expensive, while CFD simulation can complete a large number of simulation experiments in a short period of time and quickly obtain key data.

[0095] Finally, the accurate pollutant emission prediction of this method provides strong support for combustion optimization of the combustion chamber. By simulating the combustion process under different working conditions, the influence of different parameters (such as fuel type, intake air volume, combustion temperature, etc.) on pollutant emissions can be analyzed, thereby guiding the optimization design of the combustion chamber and combustion adjustment to achieve low-pollution combustion. This method not only improves the accuracy and reliability of pollutant emission prediction, but also provides an important tool for the innovation of combustion technology. Through detailed CFD simulation, various phenomena and mechanisms in the combustion process can be deeply studied, providing a scientific basis for the development of new combustion technology and low-pollution combustion technology.

[0096] In summary, this technical solution has the advantages of high precision, flexibility, low cost, support for combustion optimization and promotion of technological innovation in the study of pollutant emission laws, providing strong support for the improvement of combustion chamber performance and the control of pollutant emissions.

[0097] The division of modules in the embodiments of the present invention is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present invention may be integrated into one processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0098] In another embodiment of the present invention, a computer device is provided, the computer device includes a processor and a memory, the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function; the processor described in the embodiment of the present invention can be used for the operation of a method for analyzing the emission law of pollutants in a gas fuel combustion chamber.

[0099] In another embodiment of the present invention, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It can be understood that the computer-readable storage medium here can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the corresponding steps of the method for analyzing the emission law of pollutants in a gas fuel combustion chamber in the above embodiment.

[0100] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0101] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0102] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0103] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for analyzing the emission rules of pollutants in a gas fuel combustion chamber, characterized in that: The following steps are involved: Step 1: Construct a combustion chamber CFD model according to the structural parameters of the combustion chamber; Step 2: Calculate the flow field according to the CFD model constructed in step 1, and modify the obtained flow field characteristics until the flow field characteristics meet the requirements; Step 3, constructing a chemical reactor network model, and dividing the chemical reactor network model into combustion areas according to flow field characteristics; Step 4: simulate the chemical reactor network model, determine the pollutant emission law based on the simulation results, and update the chemical reactor network model according to the pollutant emission law until the pollutant emission law meets the requirements, obtain the final chemical reactor network model, and predict the pollutant emission law based on the final chemical reactor network model.

2. A method for analyzing the emission rules of pollutants in a gas fuel combustion chamber according to claim 1, characterized in that: When the combustion chamber is a branch pipe or annular pipe combustion chamber, the combustion chamber of the combustion chamber CFD model is a branch pipe structure or annular pipe structure; when the combustion chamber is an annular combustion chamber, the combustion chamber of the combustion chamber CFD model has a fan-shaped structure.

3. The method for analyzing the emission rules of pollutants in a gas fuel combustion chamber according to claim 1, characterized in that: The construction method of the combustion chamber CFD model is as follows: S1.

1. Establish a three-dimensional model of the combustion chamber according to the parameters of the combustion chamber, and divide the three-dimensional model into grids; S1.2, determining the boundary conditions of the three-dimensional model of the combustion chamber according to the operating parameters of the combustion chamber; S1.

3. Set the calculation model and chemical reaction mechanism of the combustion chamber three-dimensional model to obtain the combustion chamber CFD model.

4. A method for analyzing pollutant emission patterns of a gas fuel combustion chamber according to claim 1, characterized in that: The flow field characteristics described in step 2 include temperature field, velocity field, pressure field and pollutant concentration field.

5. The method for analyzing the emission rules of pollutants in a gas fuel combustion chamber according to claim 1, characterized in that: The correction method of flow field characteristics in step 2 is as follows: The flow field characteristics obtained by fluid dynamics calculation are compared with the flow field characteristics obtained by theoretical calculation and / or experiment under the same combustion conditions. When the flow field characteristics are different, the combustion chamber model structure, the grid parameters and / or fluid simulation parameters of the combustion chamber model are adjusted, and the fluid dynamics calculation is performed again until the obtained flow field characteristics are consistent with the flow field characteristics obtained by theoretical calculation and / or experiment.

6. A method for analyzing the emission rules of pollutants from a gas fuel combustion chamber according to claim 1, characterized in that: The area division method of the chemical reactor network model in step 3 is as follows: The chemical reactor network model is divided into mixing zone, recirculation zone, flame zone and post-flame zone according to the flow field characteristics, and the reactor in each zone is determined according to the relative value between the turbulent flow time and the chemical reaction time of each zone.

7. A method for analyzing the emission rules of pollutants from a gas fuel combustion chamber according to claim 6, characterized in that: The mixing zone is a full mixed flow reactor; the reflux zone and the flame zone are full mixed flow reactors; and the combustion chamber is a plug flow reactor.

8. The method for analyzing the emission rules of pollutants in a gas fuel combustion chamber according to claim 1, characterized in that: The method for updating the chemical reactor network model in step 4 is as follows: The pollutant emission patterns obtained by simulation are compared with those obtained by theoretical calculation and / or experiment. When the pollutant emission patterns are different, the chemical reactor network model is adjusted and re-simulated until the pollutant emission patterns meet the requirements. The last updated chemical reactor network model is used as the final chemical reactor network model to predict pollutant emission patterns.

9. A system for executing the method for analyzing the emission regularity of pollutants in a gas fuel combustion chamber according to any one of claims 1 to 8, characterized in that: include: A model building module, used to build a combustion chamber CFD model according to the structural parameters of the combustion chamber; The simulation module is used to calculate the flow field according to the constructed CFD model and to modify the obtained flow field characteristics until the flow field characteristics meet the requirements; A chemical network model building module is used to build a chemical reactor network model and divide the chemical reactor network model into combustion areas according to flow field characteristics; The prediction module is used to simulate the chemical reactor network model, determine the pollutant emission law according to the simulation results, and update the chemical reactor network model according to the pollutant emission law until the pollutant emission law meets the requirements, thereby obtaining the final chemical reactor network model, and predicting the pollutant emission law based on the final chemical reactor network model.

10. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method for analyzing the emission patterns of pollutants in a gas fuel combustion chamber as claimed in any one of claims 1 to 8 are implemented.

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