59 results about "Atmospheric diffusion" patented technology

The invention discloses a method and system for real-time online evaluation of off-site results of nuclear facility accidents, and belongs to the technical field of nuclear facility accident result analysis. The method comprises a wind field prediction method of a simulation area, a wind field diagnosis method, a Lagrange puff atmospheric diffusion simulation method, an estimation method of gaseous radionuclide-caused radiation dosages and prevention measures, and an airborne passing food chain radioactivity estimation method. Through the method and system provided by the invention, the wind field prediction and diagnosis, and the contaminant atmospheric diffusion simulation and radiation dosage estimation of a plurality of accident points from the happening of a nuclear facility accident to the end moment in a simulation area range which takes a nuclear facility as a center can be completed, so that result evaluation data basis is provided for the accident emergency command processing after the nuclear facility accident.

Experimental and numerical investigations on an atmospheric diffusion oxy-combustion flame in a gas turbine model combustor are conducted. The combustor is fuelled with CH₄CH4 and a mixture of CO₂ and O₂ as oxidizer. The stability of the oxy-combustion flame is affected when the operating percentage of oxygen in the oxidizer mixture is reduced below 25%. A new 3D reactor design is introduced for the substitution of ITM reactors into a gas turbine combustor. A new oxygen permeation equation model has been developed by fitting the experimental data available in the literature for a LSCF ion transport membrane. The monolith structure design ITM reactor is capable of delivering power ranging from 5 to 8 MWe based on cycle first law efficiency.

The invention discloses an emergency system for atmospheric environmental risks. The system comprises input equipment, output equipment, a processor and a database, wherein the processor is connected with the input equipment, the output equipment and the database in an information technology way; the database comprises a climate and weather database, a chemical database, a geographic information database and an atmospheric prediction model database; and the processor displays the atmospheric environmental risks of hazardous substances on a geographic information system (GIS) map according to climate and weather data, chemical data, geographic information data, an atmospheric prediction model and input hazardous substance leakage data. The emergency system provides decision support for accident emergency rescue based on an information technology by comprehensively utilizing high and new scientific and technical means such as a geographic information system, real-time weather forecasting, networks, multimedia and the like, utilizing an atmospheric diffusion prediction technology and combining a modern environmental risk management theory.

The invention relates to an airplane tail jet flow atmospheric diffusion modeling method based on CFD (computational fluid dynamics), which comprises the following sequential steps: building a fluid mechanics equation of tail jet flow multi-component airflow; carrying out mesh generation and boundary condition setting on a tail jet flow diffusion area; according to the size of a calculation area, carrying out Farve density weighted average on the above equation; after the pressure and the temperature of a flow field are distributed, the fluid density is calculated, and then, the next round of loop iteration is started; the engine tail jet flow parameter input is subjected to three-dimensional area analog computation; and the working condition account case of various airplanes are built to obtain a tail jet flow diffusion analog result of airplanes of different tail spraying model numbers under various atmosphere parameters and altitudes. According to the airplane tail jet flow atmospheric diffusion modeling method based on the CFD, the blank of the airplane tail jet flow on the aspects of long-distance and big-area diffusion numerical value analysis is made up, and a numerical value analysis basis is provided for the optimization design of an airplane tail nozzle and the analysis of a safe distance between a front airplane and a rear airplane in the airplane flying process so as to guarantee the flying safety of an aerospace engine.

The invention discloses a method for prolonging service life of an engine thermal barrier coating by controlling components of a thermal growth oxide layer. The thermal barrier coating utilizes high velocity oxy-fuel spray to prepare a bonding layer, utilizes low-energy power or high-energy power of atmospheric plasma to spray on a ceramic layer, then a combined technology of vacuum heat treatment and atmospheric diffusion heat treatment is carried out on the thermal barrier coating to restrain a premature appearance of spinel so that an edge of the thermal barrier coating is mainly alumina. Materials with a specific orientation of large grains are formed at the interface position of the alumina and the bonding layer to prevent oxygen from further largely intruding into the bonding layer and a base metal in a high-temperature service process. And the high-temperature service life of the thermal barrier coating is improved.

The invention provides a source item release inversion and diffusion prediction method based on an integrated atmospheric diffusion model, and the method comprises the steps: 1, integrating three atmospheric diffusion models: CFD, Aermod and Calpuff, and enabling the three atmospheric diffusion models to be used for the analog calculation of different scales; 2, based on the concept of a smoke plume emergency planning area, carrying out modeling in advance by independently adopting three atmospheric diffusion models including CFD, Aerod and Calpuff for a near area, namely, an inner area of 5 km and an outer area of 10 km, of the nuclear power plant; 3, simultaneously storing various typical wind field calculations, various accident source items and release rules thereof, and concentrationchange rules monitored or simulated at feature positions in various accident scenes in a database; and step 4, when a radioactive leakage accident occurs, automatically inverting a release position and an accident type according to a concentration change rule at the characteristic position, quickly calculating a diffusion direction, a diffusion range and a severity degree of future pollution basedon real-time weather forecast information, assisting a decision maker to directionally issue an early warning in advance, and making an emergency response scheme.

The invention relates to a multi-heat-source heat supply system load scheduling distribution method and system based on urban atmospheric diffusion process simulation prediction. The method comprisesthe following steps that S1, all heat source pollutant emission models are established; s2, establishing a heat supply network model, a heat source side load constraint, a heat supply network transmission and distribution capability constraint and a heat supply network splitting model, and determining a multi-heat-source load distribution feasible region; s3, importing the multi-layer regional simulation meteorological data and the pollutant list as boundary conditions into an atmospheric quality prediction model system, generating pollutant concentration space-time distribution, and verifyingthe model; s4, establishing an atmospheric quality evaluation system; and S5, constructing a target function of the lowest atmospheric pollution, and performing multi-scheme comparison on line to ensure that the atmospheric quality of the key region reaches the standard in a specific period and obtain an optimal multi-heat-source heat supply system load scheduling distribution scheme. The methodand the system provided by the invention can effectively solve the problem of air quality guarantee during major activities.

The present invention provides a nuclear accident source item inversion method of neural network adaptive Kalman filter. The method comprises the following steps: establishing a nuclear accident source item inversion model based on neural network adaptive Kalman filter, and determining the input parameters and output parameters of a neural network structure; establishing an atmospheric pollutant diffusion model; and determining observation variables, system variables, an observation matrix, a state transfer matrix and a calculation flow of an adaptive Kalman filter module, and finally obtaining a neural network adaptive Kalman filter nuclear accident source item inversion model. The method selects optimal parameters of the neural network when the neural network combines the adaptive Kalman filter to rapidly screen accidents to replace a simple approximation model with self learning of an atmospheric diffusion process in different weather conditions through the neural network, an adaptive algorithm is selected to overcome the defects of larger filtering errors and filtering diffusion of a conventional Kalman filter algorithm in the nonlinear variation condition, perform real-time online inversion and provide basis for the nuclear accident consequence evaluation and emergency decision.

The present invention relates to the technical field of impact assessment on the radionuclide atmospheric environment and particularly relates to a method for predicting and calculating a radionuclide accident atmospheric diffusion track set. According to the method, a wind field driving data set, diffusion parameter sets under different stabilities and a data set of different radioisotope source items are calculated and a calculation mode of driving atmospheric diffusion in a release mode is combined to obtain a set of different radionuclide concentrations in ground release or elevated release and feature values of sets of different and all radionuclide concentrations are given out; and different radionuclide concentrations and all the radionuclide concentrations are subjected to spatial interpolation by utilizing an interpolation method so as to obtain atmospheric diffusion track spatial distribution set prognostic maps at different release time. The calculation method is scientific and reasonable, has high applicability, is an important technical means for impact assessment on the radionuclide environment and has the important significance in the technical field of impact assessment on the radionuclide atmospheric environment.

The invention relates to the technical field of nuclide atmospheric environment influence evaluation under the future weather situation of a nuclear power plant, in particular to a prediction method for a public dosage caused by the nuclide under future weather situation of the nuclear power plant. The method comprises the following steps that: utilizing a random sampling method to generate a sitemeteorological factor field; utilizing the future weather situation to generate a regional site meteorological factor field disturbance quantity, and utilizing meteorological station random meteorological field data under current weather and future weather situations to drive an atmospheric diffusion model to generate atmospheric dispersion factors under current and future weather situations; andcomparing the public dosage caused by the nuclide under different orientations and different distances under the current weather and future weather situations. The method is scientific and reasonableand is an important technical means for predicting and analyzing the radionuclide atmospheric environment influence of the nuclear power plant.

The invention provides a microbial aerosol atmospheric diffusion hazard assessment method which is characterized by comprising the following steps of: step 1: for a concerned region, establishing an automated numerical weather prediction system for obtaining weather data; step 2: in combination with the weather data and microbial pathogen aerosol release information, performing simulation to obtain a microbial aerosol atmospheric diffusion trend; step 3: drawing diffusion trends of released microbial aerosol at different time to pre-judge a pollution area and concentration distribution of the microbial aerosol; and step 4: assessing the number of people possibly infected each day and the death toll. Compared with the prior art, the method has the characteristics that the timeliness still can meet corresponding time demands of emergency on the basis of improving the precision and credibility of microbial aerosol atmospheric diffusion hazard assessment and calculation, and relatively high universality is achieved.

The invention discloses a flying area layout planning method for the atmospheric environment impact. The method comprises the steps that the number of runways and the orientation value range of each runway are determined by predicting airport future flights and meteorological information data, and corresponding different airport flying area layout schemes are made according to the runway number and orientation combination scheme; the discharge amount of pollutants of NOx, SOx, CO, HC and PM in the four stages of approaching, taxiing, takeoff and climbing of a plane is calculated; an AERMOD atmospheric diffusion model is built to simulate discharged pollutant diffusion, caused by the different flying area layout schemes, in the four stages of approaching, taxiing, takeoff and climbing of the plane separately, and the concentrations of the pollutants in an evaluation area are obtained; corresponding pollutant diffusion areas are calculated according to the pollutant concentrations, and the flying area layout planning scheme corresponding to the smallest area is the flying area layout planning scheme having the minimal impact on the atmospheric environment. Accordingly, the impact of an airport on the surrounding atmospheric environment can be reduced.

An environmental impact assessment method based on an atmospheric diffusion model and a linear programming is characterized in that the method comprises the following steps: (1) determining an assessment area on an atmospheric diffusion model platform and dividing the assessment area into computational grids; (2) establishing a parameter database of the assessment area which meets the requirementsof the atmospheric diffusion model platform, and selecting several points of interest in the assessment area; (3) The atmospheric diffusion model platform outputs the results of the concentration contribution value of each pollutant emitted from each pollution source to each point of interest for use by the linear programming platform; (4) the linear programming platform establishes the maximum emission model of atmospheric pollutants, the model is as follows: the objective function is f (Q) = D * B * Q 0 * A; (5) After waiting for the end of the current appraisal cycle, return to step (3) toenter the next appraisal cycle. The method of environmental impact assessment based on atmospheric diffusion model and linear programming has high accuracy and real-time performance.

The invention provides an intelligent analysis method for atmospheric quality of an industrial park. The method comprises the following steps: determining the industrial park and an analysis time period; acquiring the concentration, emission position, emission amount and chemical components of pollutants monitored by all preset monitoring points in the industrial park in the analysis time period, so as to draw a change curve of the monitoring data; acquiring meteorological data, and processing through a pre-trained atmospheric diffusion model in combination with the concentration, the emission position, the emission amount and the chemical components of the pollutants of each monitoring point to obtain a pollution source diffusion simulation curve; and comparing the pollution source diffusion simulation curve with the change curve of the monitoring data, and iterating a pollution source diffusion rule so as to calculate the actual emission amount of each monitoring point and the source of the additional emission amount. By implementing the system and the method, the source tracing of VOCs pollution in the park can be realized, and intelligent data analysis can be carried out from the perspective of industrial park treatment measures, so that support on scenes such as forecasting and early warning of key pollutants, emergency dispersion auxiliary decision making, comprehensive treatment and the like is realized.

The invention discloses a nuclear facility near-field environment simulation numerical wind tunnel establishing system and method, and the system comprises a preprocessing module which is used for setting boundary conditions and experiment conditions through a GUI interface, importing and processing a geometric model of a numerical wind tunnel simulation object, setting grid parameters, and automatically generating a grid; a CFD solver module which is used for realizing steady-state model solving, isothermal or non-isothermal model solving, multi-component transfer model solving and Lagrange particle model solving, considering the influence of buoyancy and lifting force and providing various turbulence models; a numerical wind tunnel simulation module which is used for selecting a corresponding turbulence model based on the preprocessing module and the CFD solver module and performing numerical wind tunnel simulation on near-field atmospheric diffusion of the nuclear facility to obtaina simulation result; and a post-processing module which is used for automatically extracting various types of data in the simulation result and carrying out visual output. Based on the CFD principle,a proper air turbulence model is selected, and nuclear facility near-field atmospheric diffusion can be accurately simulated.

The invention discloses a method for improving the inversion accuracy of a sudden atmospheric pollution accident source, and belongs to the technical field of sudden accident emergency early warning evaluation. The method is characterized by comprising six steps of data preparation and model determination, model parameter value basis judgment, model parameter sensitivity analysis and identification, high-sensitivity parameter optimization, optimization model simulation performance evaluation and source inversion result evaluation. The core idea of the method is to improve the accuracy of source inversion by optimizing and improving the simulation performance of the diffusion model. According to the method for improving the inversion accuracy of the sudden atmospheric pollution source, on the basis of the collected external field simulation experiment data, the Gaussian smoke plume model serves as an atmospheric diffusion model, application testing is conducted on the method, and the result shows that the method can effectively improve the inversion estimation accuracy of the intensity and position information of the pollution source.

The invention relates to a leakage source positioning method and device based on a variable step size recurrence track. The method comprises the following steps: constructing an objective function model associated with gas concentration information according to a preset atmospheric diffusion model; gas concentration information of the current position is monitored, and an objective function modelcalculation value of the current position is obtained according to the gas concentration information of the current position, the atmospheric diffusion model and the objective function model; gas concentration information of the next position is monitored, and an objective function model calculation value of the next position is obtained according to the gas concentration information of the next position, the atmospheric diffusion model and the objective function model; and according to the objective function model calculation value of the current position and the objective function model calculation value of the next position, the leakage source strength and the leakage source position are determined. According to the method, the leakage source strength and the leakage source position canbe obtained according to the calculated value of the objective function model, and accurate positioning of the hazardous chemical gas leakage source is achieved.

The invention discloses an airport single-runway orientation selecting method for lowering the influence on the atmospheric environment. The method comprises the following steps of determining the airport single-runway orientation value range by predicting airport future flights and meteorological information data; calculating the discharge volume of pollutants in the takeoff stage of an aircraft, wherein the pollutants include NOx, SOx, CO, HC and PM; building an AERMOD atmospheric diffusion model, and simulating aircraft pollutants in evaluation areas due to different runway orientations respectively to obtain the concentrations of the pollutants in the evaluation areas; quantifying the influence of all schemes on the atmospheric environment through the diffusion areas of the pollutants, and regarding the minimum area as a decision-making object, wherein the runway orientation corresponding to the minimum area is the runway orientation scheme which has the smallest influence on the atmospheric environment. By simulating the influence on the atmospheric environment due to different orientations of a single runway, the airport single-runway orientation selecting method which has the smallest influence on the atmospheric environment is constructed, so that the influence of emitted pollutants during the takeoff of the aircraft on the surrounding atmospheric environment is lowered.

The invention belongs to the technical field of radioactive gas sampling, and relates to a new device for realizing passive combined collection of atmospheric radioactive tritium and carbon. The device consists of a top cover assembly, a 14CO2 adsorption chamber assembly, an indicator chamber, an HTO adsorption chamber, a diffusion chamber, a bottom cover, a sealing assembly and a filter membraneassembly. According to the device provided by the invention, based on the atmospheric diffusion theory and Fick's first law of diffusion, an adsorbent material with good an enrichment effect on environmental water vapor and carbon dioxide is placed in a sampler to realize high-efficiency enrichment of a target gas; and through a computational fluid dynamics (CFD) simulation technology, an appropriate sampling diffusion length is determined to ensure the stability of the sampling efficiency. Field tests show that the device can meet the requirement of stable sampling under general environmentalconditions. The device does not need power support for the collection of environmental water vapor and carbon dioxide, and is economical and convenient, and the maximum relative deviation between a collected sample measured and a result monitored by an existing active device is 16%, so that the device can meet requirements of investigation of large-scale environmental level radioactive tritium and carbon.

The invention provides a simplified simulation method for atmospheric behaviors in behavior simulation of a chemical substance environment system simulation coupled with a hydrological process, and the method comprises the steps: calculating the total variable quantity of the chemical substances in the atmosphere of a sub-basin, and calculating the concentration of the chemical substances in the atmosphere according to the total variable quantity, wherein the horizontal migration of the chemical substances in the atmosphere is simulated by taking the spatial range corresponding to the sub-basin as precision, and the dry sedimentation part is calculated according to the precision of the hydrological basic unit when the chemical substances in the atmosphere migrate in the vertical direction. The complex calculation requirement for migration and transformation of chemical substances in the atmosphere is reduced with the cost of low atmospheric diffusion calculation precision, and the chemical substance environment system exposure model coupled with the hydrological process can quickly complete calculation on the premise that the prediction precision of the surface environment medium exposure concentration is ensured.

The invention discloses a nuclear power plant atmospheric diffusion prediction correction method and system, a medium and electronic equipment. The method and the system are suitable for nuclear powerplant accident leakage. The method comprises the following steps of: S1, predicting the current pollutant spatio-temporal data through a combined prediction model according to the current environmentinformation and leakage information; S2, acquiring current radiation monitoring spatio-temporal data actually monitored during accident leakage; S3, calculating to obtain a correction model accordingto the predicted current pollutant spatio-temporal data and the actually monitored current radiation monitoring spatio-temporal data; and S4, predicting future pollutant spatio-temporal data throughthe combined prediction model according to the current environment information and the leakage information, and inputting the future pollutant spatio-temporal data into the correction model for correction to obtain corrected future pollutant spatio-temporal data. Therefore, more accurate prediction is made, practical and feasible nuclear emergency decision-making technical support is provided fora decision maker, and the system and the method have important significance in taking emergency protection actions in a short time and reducing radioactive consequences of nuclear accidents.

The invention provides a satellite atmospheric correction method for a multi-angle polarization water color remote sensor. According to the atmospheric correction method provided by the invention, the atmospheric diffusion transmittance index lookup table for the off-water radiation linear polarization component under the medium-low turbidity water body is constructed by utilizing the vector radiation transmission model, and the off-water radiation polarization component is accurately corrected in the correction process; and finally, accurately obtaining the concentration of suspended particulate matters in the water body and the optical thickness, concentration and particle size spectrum distribution of aerosol according to the water-leaving radiation linear polarization component. Through the atmospheric correction method provided by the invention, the image quality of satellite remote sensing detection can be higher, and the detection result is more accurate.

The invention provides a method and system for the seeding operation technology of a ground smoke-generating furnace for artificial enhancement of rain and snow. Numerical simulation and analysis areperformed on atmospheric diffusion under the action of AgI catalysts based on an ADMS urban model numerical mode, the method and system for the seeding operation technology of the ground smoke-generating furnace for artificial enhancement of rain and snow are studied and established through combination of practice and experience indexes. Through the method, the technical problem that the amount ofthe AgI catalysts cannot be determined in a targeted mode during operation of an existing ground smoke-generating furnace for artificial enhancement of rain and snow can be solved to a maximum extentunder the conditions of different weather and environments, and the operation of the ground smoke-generating furnace for artificial enhancement of rain and snow can be more scientific, more effective, simpler and easier through the method; moreover, loss and waste which are caused by blind operation, artificial rain bombs and other resources can be reduced greatly, effects of effective protectionand development of water resources in the air are achieved, foundations are laid for scientific and effective implementation of the seeding operation, the scientificity of seeding operation of artificial enhancement of rain and snow through the ground smoke-generating furnaces can be improved greatly, and the purposes of reduction of atmospheric pollution and restoration of the ecological environment are achieved.

The invention relates to a leakage source positioning method and device based on a positioning period and computer equipment. The method comprises the following steps: constructing an objective function model associated with gas concentration information according to a preset atmospheric diffusion model; monitoring gas concentration information of the current period and acquiring an objective function model calculation value of the current period according to the gas concentration information, an atmospheric diffusion model and an objective function model in a current period; monitoring the gas concentration information in a next period, and obtaining an objective function model calculation value of the next period according to the gas concentration information of the next period, the atmospheric diffusion model and the objective function model; and according to the objective function model calculation value of the current period and the objective function model calculation value of the next period, determining the leakage source strength and the leakage source position. According to the method, the leakage source strength and the leakage source position can be obtained according to the calculated value of the objective function model, and accurate positioning of the hazardous chemical gas leakage source is achieved.

The invention provides a coking soil pollution spatial distribution prediction optimization method and system. The scheme comprises the following steps: acquiring a smoke diffusion range by utilizing acquisition equipment, and calculating a pollutant coordinate, a discharge rate, ground meteorological data, a discharge height and a discharge flow; inputting ground meteorological data and sounding meteorological data in sequence as a meteorological data source; acquiring a meteorological background initial value, terrain elevation data and pollution source data, generating site features and comprehensive pollution source data, inputting the data into a pollutant propagation model, and generating the pollutant concentration of any point; and obtaining a pollutant propagation model, obtaining a target lateral diffusion coefficient and a target transverse diffusion coefficient corresponding to the lowest error, and generating a heavy metal pollutant drawing according to a pollutant result. According to the scheme, an enterprise emission particulate matter simulation result is calculated through the atmospheric diffusion model and serves as a collaborative variable to be applied to the collaborative Crisgin interpolation method, and the prediction precision of heavy metal pollutants of soil around a coking plant is improved.