5 results about "Chemical models" patented technology

This invention discloses a method for calculating the safe density window of hydrate formations considering drilling fluid action. A multi-field coupled thermal-fluid-solid-chemical model is established, taking into account the effects of mud cake seepage at the wellbore and the decomposition of natural gas hydrates. The simulation results present the distribution of pore pressure, temperature, and solute concentration in the drilling fluid around the wellbore after drilling fluid intrusion. Based on the solution results of the multi-field coupled model and combined with the Coulomb-Mohr failure criterion, a method for calculating the safe density window of hydrate formations under drilling fluid action is further established. This method more comprehensively considers the influence of various factors on wellbore stability during hydrate extraction, making the model results more accurately reflect the actual formation conditions and providing a basis for the design of drilling fluid anti-collapse performance during hydrate formation drilling.

The application discloses a radioactive separation laboratory environment radiation field dynamic modeling method and system, and belongs to the field of chemical process modeling. Step 1, the concentration distribution of a non-radioactive process tracer physically associated with a target radionuclide in a process fluid is obtained; step 2, based on the concentration distribution and the macroscopic residence time distribution of the material, the pre-judgment source term of the radionuclide is obtained through time translation and decay scaling; step 3, the radiation field observation waveform collected by a heterogeneous radiation sensitive field sensor network and independent of the pre-judgment source term is obtained; step 4, the theoretical radiation field change waveform calculated based on the pre-judgment source term is obtained; the application can obtain the concentration distribution of the non-radioactive tracer physically associated with the target radionuclide, eliminate the inherent bias of the source term from the source, and accurately depict the time-varying characteristics of the source term caused by the continuous migration of the material without making steady-state or quasi-static simplification assumptions on fluid turbulence, two-phase interface dynamic change and other processes.

The application relates to the technical field of sewage treatment, in particular to a phosphorus removal reagent adding method and system for chemical phosphorus removal in a sewage treatment plant. The method comprises the following steps: collecting operation parameters of the sewage treatment plant in real time; inputting the collected operation parameters into a pre-constructed dynamic physical and chemical model, simulating the dynamic change of a phosphorus removal process, and rollingly predicting a variation trajectory of effluent phosphorus concentration in a future set prediction time domain; the dynamic physical and chemical model comprises a precipitation module, an aging module and an adsorption module; a model predictive control algorithm is adopted to take the minimum phosphorus removal reagent adding amount and the stable and up-to-standard effluent phosphorus concentration in the future set prediction time domain as an optimization target, so as to obtain an optimal phosphorus removal reagent adding amount sequence in the future set prediction time domain. The application can reduce reagent consumption, sludge production and operation cost.

The application discloses a battery simulation model construction method, device, equipment and medium, and belongs to the technical field of new energy storage. The method comprises the following steps: obtaining cell parameters, charging and discharging data and production line statistical data of a battery; the battery comprises a plurality of single cells connected in series and in parallel; a three-dimensional thermal model and a physical and chemical model of a single cell are established according to the cell parameters; the dynamics parameters in the physical and chemical model of each single cell are calibrated according to the charging and discharging data by using a genetic algorithm, and a plurality of single cell pseudo two-dimensional models are obtained; a multi-cell coupling model is established according to the plurality of single cell pseudo two-dimensional models and the series-parallel connection topological structure of the battery; the multi-cell coupling model is corrected according to the production line statistical data by using a Monte Carlo simulation method, and a multi-cell electrochemical model of the battery is obtained; and the multi-cell electrochemical model and the three-dimensional thermal model are coupled to obtain a simulation model of the battery. The application can solve the problem of low precision of existing cell simulation.

The present application relates to the replacement and acceleration of atmospheric chemical reaction calculation in atmospheric chemical model, and particularly relates to a replacement model of atmospheric chemical reaction calculation and a construction method, the model has high precision in reproducing chemical reaction process, in the 19-day offline prediction of 279 prediction variables of the case, the proportion of prediction variable determination coefficient exceeding 0.99 is 96%; the model can realize at least 10-day continuous stable prediction; the model has significant acceleration of chemical calculation: compared with the original GEOS-Chem chemical integrator, the time consumption of ChemKNet calculation on single CPU can be saved by about 79%, and only about 1% of the original calculation time is needed on single GPU, greatly improving the calculation efficiency of large-scale simulation; the model supports coupling and continuous prediction; the model has full-chem chemical mechanism and global simulation covering GEOS-Chem.