19 results about "Combustion kinetics" patented technology

The invention relates to the technical field of environment early warning, and discloses a holographic sensing multi-mode environment early warning control method and system, and the method comprises the steps: obtaining an original multi-mode signal, and constructing a multi-mode fire signal matrix; performing matrix decomposition operation of combustion dynamics constraint and flue gas diffusion constraint on the multi-modal fire signal matrix to obtain a fire basic characteristic matrix and a spatio-temporal evolution coefficient matrix; performing feature fusion on the fire basic feature matrix and the spatio-temporal evolution coefficient matrix to obtain a comprehensive fire feature vector; according to the method, multi-dimensional fire feature information such as temperature, smoke, gas, acoustics and infrared can be captured at the same time, the comprehensiveness and reliability of fire detection are improved, and the method is suitable for popularization and application. And the three-dimensional space coordinates of the fire source can be accurately determined.

The invention relates to a method for testing the combustion dynamic performance of block refractory metal, and belongs to the technical field of material performance testing. A block refractory metal sample is clamped and placed in the quartz tube; a laser transmitter and a high-speed camera are arranged outside the quartz tube; introducing gas from the bottom of the quartz tube along the circumferential direction; starting a laser emitter to emit laser to burn the sample, and recording the whole burning process through a high-speed camera; and quantitatively acquiring a performance index for evaluating the combustion dynamics of the refractory metal according to a result of the high-speed camera. By adopting a flaky sample with the thickness of 0.05-2 mm, ignition and self-sustaining combustion of block refractory metal in a laboratory environment can be achieved, and the combustion dynamic performance such as ignition delay time, combustion critical oxygen concentration, self-sustaining combustion line combustion speed and self-sustaining combustion volume combustion speed of the block refractory metal can be obtained; the method can be used for evaluating the combustion performance of the energetic structure material and selecting the energetic structure material.

System that features: a gas turbine (10) which features: a first combustion chamber (12; 90-98) which has a first fuel nozzle (20, 21); a second combustion chamber (12; 90-98) which has a second fuel nozzle (20, 21); a first acoustic adjustment device (14) comprising a first actuator (67) coupled to a first actuating piston (66) with a first fuel orifice (70), wherein the first actuating piston (66) is arranged along a first fuel passage leading to the first fuel nozzle (20, 21), the first fuel orifice (70) being arranged to receive fuel in the first fuel passage and allow it to pass to the first fuel nozzle (20, 21); and a second acoustic adjustment device (14) comprising a second actuator (67) coupled to a second actuating piston (66) with a second fuel orifice (70), wherein the second actuating piston (66) is arranged along a second fuel passage leading to the second fuel nozzle (20, 21), wherein the second fuel orifice (70) is arranged to receive fuel in the second fuel passage and allow it to pass through to the second fuel nozzle (20, 21); wherein the first drive (67) of the first acoustic adjusting device (14) is configured to set a first axial position of the first adjusting piston (66) in order to vary a first distance (84) between the first fuel orifice (70) and the first fuel nozzle (20, 21); wherein the second drive (67) of the second acoustic adjusting device (14) is configured to adjust a second axial position of the second adjusting piston (66) in order to vary a second distance (86) between the second fuel orifice (70) and the second fuel nozzle (20, 21), wherein the first distance (84) is different from the second distance (86); wherein the first drive (67) is coupled to a first rotary disk system (42) comprising several first perforated disks (104, 106, 107) arranged in the first fuel passage leading to the first fuel nozzle (20, 21); and wherein the second drive (67) is coupled to a second rotary disk system (42) which has several second perforated disks (104, 106, 107) arranged in the second fuel passage leading to the second fuel nozzle (20, 21).

This invention provides a method for predicting the hazard range of oil fires on the water surface based on interface tracking coupled combustion dynamics. The method includes: using a conserved two-dimensional shallow water equation to describe oil film diffusion; spatial discretization using the finite volume method; mitigating frictional rigidity using the Strang splitting method; calculating flux using the Roe scheme; suppressing spurious flow using the Well-Balanced scheme; controlling the time step using CFL conditions; and outputting the oil film thickness hourly. A mass evaporation rate conversion model based on energy balance is constructed to transform the oil film thickness field into a mass evaporation rate field per unit area. The mass evaporation rate field is used as the bottom boundary source term of the fire dynamics model and coupled to the three-dimensional low Mach number Navier-Stokes equations through a volume source term, achieving real-time coupled simulation of oil film transport and fire spread. The combustion dynamics control equations, including the conservation of mass, momentum, energy, and components, are solved. Combined with the radiative transfer equations, the spatiotemporal distributions of the temperature field, thermal radiation flux, and flue gas concentration are calculated to achieve dynamic prediction of the hazard range of oil fires on the water surface.

The present disclosure is directed to a method of operating a combustion system to attenuate combustion dynamics. The method includes flowing, via a compressor section, an overall supply of air to the combustion system; flowing, via a fuel supply system, an overall flow of fuel to the combustion system; flowing, to a first fuel nozzle of the combustion system, a first supply of fuel defining a richer burning fuel-air mixture at the first fuel nozzle; flowing, to a second fuel nozzle of the combustion system, a second supply of fuel defining a leaner burning fuel-air mixture at the second fuel nozzle; and igniting the richer burning fuel-air mixture and the leaner burning fuel-air mixture to produce an overall fuel-air ratio at a combustion chamber of the combustion system.

System for reducing combustion dynamics in a gas turbine (10), comprising: a first and a second combustion chamber arrangement (14) arranged about an axis (78) of a rotor (18) of the gas turbine (10), each combustion chamber arrangement (14) comprising a cap arrangement (50) extending radially over the combustion chamber arrangement (14) and a combustion chamber (38) arranged downstream of the cap arrangement (50), the cap arrangement (50) comprising an upstream surface (82) and a downstream surface (84) axially separated from the upstream surface (82) which defines an upstream end of the combustion chamber (38) of the respective combustion chamber arrangement (14); wherein each cap assembly (50) contains several tubes (36) extending axially through the cap assembly (50) to provide a flow connection through the cap assembly (50) to the combustion chamber (38), wherein each tube (36) has a fuel injector (94) extending through each tube (36) to provide a flow connection into each tube (36); and wherein each cap arrangement (50) has an axial length (80) defined between the upstream surface (82) and the downstream surface (84) of the respective cap arrangement (50), wherein the axial length (80) of the cap arrangement (50) in the first combustion chamber arrangement (14) differs from the axial length (80) of the cap arrangement (50) in the second combustion chamber arrangement (14).

An active flameout prevention control method for an aero-reform gas turbine comprises the steps that historical monitoring data are preprocessed, and a combustion dynamical model and a combustion thermodynamic model are established by combining the combustion reaction process and the reaction rate in the gas turbine; the change trend of the reaction rate and the combustion heat release in the gas turbine is used as training features, and a time sequence feature matrix is formed according to the time sequence. Actual flameout data of the gas turbine are obtained, the actual flameout data are marked according to the flameout states of the actual flameout data at different time points, and marked sample data are generated; and constructing a data set, dividing the data set into a training set and a verification set, and training the LSTM deep learning model. And calling a flameout feature capture model to extract combustion features causing the flameout state of the gas turbine in the time sequence according to the current monitoring data, and predicting the flameout probability of the gas turbine based on the combustion features so as to actively prevent flameout by controlling the air-fuel ratio when the flameout probability exceeds a first threshold value.

The application belongs to the technical field of burners, and particularly discloses a flame temperature automatic detection device, which comprises a burner main body and a flame temperature detection mechanism arranged on the side of the burner main body; the burner main body is used for generating a flame; a glass cover is arranged outside the burner main body; and a plurality of detection holes are arranged on the outer surface of the glass cover. The flame temperature automatic detection device can measure the temperature of multiple points, thereby reflecting the longitudinal temperature gradient of the flame; the temperature distribution can be measured to optimize the combustion kinetics model; in addition, the combustion efficiency can be optimized through the temperature detection data, the combustion process can be controlled in detail, the energy efficiency can be improved, the fuel cost can be reduced, the safe operation of the equipment can be ensured, and the local overheating and thermal fatigue of the equipment can be avoided.

The invention relates to the field of coal blending optimization, and discloses a blending combustion coal blending optimization method based on a micro-service technology, which is used for realizing accurate characterization of a pulverized coal combustion process, accurate construction of a combustion kinetic model and effective prediction of a slagging risk. Comprising the following steps: acquiring three-dimensional point cloud data of a pulverized coal particle swarm by using a laser scanner, and generating a topological feature vector representing particle mixing uniformity through series processing; and in combination with parameters of a coal quality analyzer, the concentration distribution of unburned carbon and the generation condition of pollutants are accurately predicted. A Doppler laser velocimeter is used for collecting boiler turbulence field data, and ash component parameters are combined to generate a topological map for marking slag-bonding risk vortex core coordinates. And solving a global optimal anti-disturbance coal blending scheme through homotopy mapping. According to the method, multi-dimensional innovation is achieved, the defects of the traditional technology in the aspects of pulverized coal characteristic characterization, combustion prediction, slagging risk assessment, coal blending optimization, equipment control and the like are effectively overcome, the coal combustion efficiency and stability are improved, and pollutant emission is reduced.

The invention discloses a low-nitrogen gas combustion system based on flue gas recirculation, which relates to the technical field of gas combustion, and comprises the following steps: detecting the components of gas supplied to a combustor online in real time; based on the real-time data of the fuel gas components, two control parameters are calculated and generated at the same time; adjusting the recirculation flue gas flow according to the flue gas recirculation rate recommendation value, and adjusting the operation parameters according to the activation intensity recommendation value; and mixing the recycled flue gas subjected to activation treatment with fuel gas and combustion-supporting air, and combusting. According to the method, gas components are detected in real time and input into a combustion kinetic model, the optimal flue gas recirculation rate and the plasma activation intensity are synchronously decided, key free radicals are supplemented through activated flue gas, and the contradiction between deep nitrogen reduction and combustion stability in the traditional technology is broken through; through a linkage execution mechanism and an intelligent dynamic mixing distribution strategy, collaborative precise regulation and control of a physical field and a chemical field in the combustion process are achieved.

The invention provides a simulation method and system considering energy conversion of a plasma ignition system, and belongs to the technical field of plasma-assisted combustion numerical simulation. The method comprises the following steps: acquiring combustion parameters and kinetic parameters in a plasma ignition simulation process; classifying plasma dynamics and combustion dynamics according to reaction types, and performing global sensitivity analysis based on combustion parameters and kinetic parameters; determining key substances by adopting a plasma thermochemical unstable model and energy decomposition according to the result of the global sensitivity analysis; and processing the key substance by using an element-based plasma global flux model, determining a specific global path and dynamic effects of a chemical reaction in different time periods, further determining a fuel decomposition path, and quantifying the dynamic enhancement process of plasma ignition. The problem of explaining the plasma enhanced ignition rule is effectively solved, and further application of the PAC technology is promoted.

This invention relates to the field of combustion dynamics technology, and provides a method for modeling the combustion dynamics of nano-aluminum particles based on molecular reaction dynamics. The method includes: S1 constructing a nano-aluminum particle model; S2 establishing an oxidation combustion reaction system; S3 analyzing molecular trajectories; S4 extracting reaction paths; S5 determining gas-phase reaction kinetic parameters; S6 determining surface reaction kinetic parameters; S7 constructing a heterogeneous combustion kinetic mechanism; and S8 verifying and outputting simulation results. This invention directly extracts reaction paths through molecular dynamic trajectories in the reaction force field, reducing the subjectivity of relying entirely on artificially preset elementary reactions. It supplements key gas-phase and surface reaction parameters through quantum chemical calculations and density functional theory calculations, improving the physicochemical basis of the mechanism parameters. By coupling gas-phase and surface reactions into a heterogeneous combustion kinetic mechanism, it more completely describes the structural evolution process of aluminum nanoparticles from melting, rapid oxidation, partial oxidation to equilibrium.

The present application provides a rail transit material combustion smoke density dynamic monitoring method and system, relating to the technical field of rail transit, comprising collecting smoke concentration data of multiple sensors in a combustion test box, using a three-dimensional space interpolation algorithm of adaptive grid refinement for three-dimensional reconstruction, combining material combustion characteristic parameters to construct a combustion kinetics model, fusing high-precision three-dimensional distribution map and the kinetics model, constructing a multi-scale diffusion prediction model based on graph neural network, generating smoke density distribution and diffusion path prediction data at future time, so as to realize accurate monitoring and early warning of rail transit carriage smoke density.

The invention discloses a petroleum coke POX ash combustion dynamics testing device and a testing method. The testing device comprises a heating furnace and a fluidized bed reactor arranged in the heating furnace, a feed port and an exhaust port are formed in the top of the fluidized bed reactor, a gas inlet is formed in the bottom of the fluidized bed reactor, a three-way gas switching valve is arranged at the gas inlet of the fluidized bed reactor, and two inlets of the three-way gas switching valve are connected to an inert gas storage tank and a high-purity air storage tank respectively; temperature sensors are arranged in the heating furnace and the fluidized bed reactor, the temperature sensors of the heating furnace are arranged at the upper part, the middle part and the lower part of the heating furnace, and the temperature sensor in the fluidized bed reactor is arranged at the central position of the fluidized bed reactor. The testing device provided by the invention can smoothly realize the combustion dynamics test of the petroleum coke POX ash, obtains the combustion dynamics parameters of the petroleum coke POX ash, and provides theoretical guidance for parameter adjustment in the combustion process of the petroleum coke POX ash.

The invention provides a water surface oil fire hazard range prediction method based on interface tracking coupling combustion kinetics, and the method comprises the steps: employing a conservation type two-dimensional shallow water equation to describe oil film diffusion, employing a finite volume method to perform spatial discretization, employing a Strand splitting method to relieve friction rigidity, employing a Roe format to calculate flux, employing a Well-Balanced format to inhibit false flow, and employing a CFL condition to control a time step length. The oil film thickness is output hour by hour; a mass evaporation rate conversion model based on energy balance is constructed, and the oil film thickness field is converted into a unit area mass evaporation rate field; the mass evaporation rate field serves as a bottom boundary source item of the fire dynamic model and is coupled to a three-dimensional low-Mach-number Navier-Stokes equation set in a body source item mode, and real-time coupling simulation of oil film transportation and fire spreading is achieved; and solving a combustion dynamic control equation containing mass, momentum, energy and component conservation, and calculating spatial and temporal distribution of a temperature field, thermal radiation flux and smoke concentration in combination with a radiation transfer equation so as to realize dynamic prediction of the hazard range of the oil fire on the water surface.

This invention relates to a simplified method for combustion mechanisms based on reaction molecular dynamics, belonging to the field of combustion dynamics simulation technology. The method first constructs an ammonia-hydrogen combustion system model using Materials Studio software; secondly, it uses the C / H / O / N potential function and performs multi-condition simulations using LAMMPS software; then, it extracts key reaction pathways and core species through reaction trajectory analysis, and removes secondary species and reactions based on species reaction frequencies, constructing a simplified combustion mechanism model; finally, it verifies and optimizes key parameters such as laminar flame velocity and ignition delay time using Chemkin-Pro software under multiple conditions. This invention overcomes the shortcomings of traditional combustion mechanism simplifications that rely on empirical judgment, revealing the essence of combustion reactions at the atomic scale. While ensuring prediction accuracy, it significantly reduces the computational complexity of the mechanism, providing theoretical support for a deeper understanding of combustion dynamics mechanisms and guidance for the efficient organization and optimization of combustion processes.

The invention belongs to the technical field of boiler heating surface high-temperature corrosion monitoring, and relates to an acquisition method and system of a boiler heating surface monitoring and early warning model and a monitoring and early warning method. According to the method, multi-dimensional monitoring data based on the boiler heating surface are obtained; establishing a boiler model characteristic database according to boiler structure characteristics, material characteristics and operation thresholds; establishing a fuel type knowledge graph according to the fuel component parameters and the combustion dynamic characteristics; and based on the multi-dimensional monitoring data, the boiler model feature database and the fuel type knowledge graph, a transfer learning algorithm is adopted to train the adaptive monitoring model, and a monitoring early warning model is obtained. According to the method, more accurate monitoring and early warning of the metal structure of the boiler heating surface are facilitated, various key factors in the operation process of the boiler heating surface can be comprehensively considered, and the problem that in the prior art, when a general model is adopted for monitoring and early warning, the fault recognition accuracy is low is effectively solved; the accuracy and reliability of monitoring and early warning of the boiler heating surface metal structure are improved.

This invention discloses a comprehensive analysis method and apparatus for the combustion characteristics of hydrogen-blended natural gas pipelines, relating to the fields of gas transmission and distribution and comprehensive utilization of hydrogen energy. Addressing the lack of a systematic method in existing technologies for simultaneously predicting the calorific value, Wobbe index, and combustion potential of hydrogen-blended natural gas, this invention constructs an integrated computational model encompassing thermodynamics, interchangeability, and combustion kinetics, employing a modular design: it calculates the higher and lower calorific values ​​of the mixed gas using a weighted average method, calculates the Wobbe index based on relative density and internationally accepted definitions, and innovatively quantifies combustion potential using a semi-empirical model; it also cross-compares with national standards such as GB17820, and uses multi-indicator collaborative decision-making to determine the feasibility of the proposed scheme. This invention overcomes the shortcomings of the three-dimensional comprehensive evaluation of hydrogen-blended natural gas, offering accurate calculations, strong compliance, and the ability to rapidly generate hydrogen blending ratio-combustion characteristic maps, providing technical support for the design of hydrogen-blended transportation projects, operational safety assessments, and the formulation of relevant national standards.

According to the hydrogen combustion nozzle assembly for the pulverized coal burner and the pulverized coal burner, a fuel channel assembly, an ignition assembly, a flange piece and an annular spray head assembly are arranged, the annular spray head assembly comprises an isolation air cavity, an isobaric fuel annular cavity and an isobaric air annular cavity, and hydrogen fuel gas and air are supplied through the fuel channel assembly; the ignition assembly is used for ignition, the flange piece is connected and sealed with an external combustor, and the annular spray head assembly outputs fuel and air mixed gas obtained after the hydrogen fuel gas and the air flow are subjected to cross jet flow in the annular multi-point position mode. Micro-mixing diffusion hydrogen-burning nozzles which are uniformly distributed at multiple points in the circumferential direction are integrated into an annular assembly with a compact radial size, and are combined with a conventional pulverized coal burner, so that fuel-air mixed gas in a micro-mixing diffusion burning mode is increased, a composite burning field is formed, the air temperature is increased, the ignition delay time of pulverized coal is shortened, and the combustion efficiency is improved. And meanwhile, the condition of NOx sharp increase caused by tempering and a large-area high-temperature area is avoided, and the combustion dynamic characteristic is improved.