67 results about "Conservation principle" patented technology

The invention provides an oil and gas reservoir numerical simulation calculation method. The method includes calculating oil phase pressure, water phase pressure and gas phase pressure of a spatial dispersion post simulation process at any moment, calculating total volume flow of fluid in the flowing direction according to the oil phase pressure, water phase pressure and gas phase pressure of the spatial dispersion post simulation process at any moment, calculating oil saturation, gas saturation and water saturation according to the total volume flow of the fluid in the flowing direction and correcting the oil saturation, the gas saturation and the water saturation according to the substance conservation principle. In the method, the pressure is calculated in one step, the speed is calculated in one step, and branch flow and saturation are calculated in multiple steps, velocity item calculation is introduced, and calculation misconvergence caused by factors such as anisotropy, fluid phase change and unreasonable production systems is avoided. The numerical simulation stability is better, the convergence condition is easy to judge, and the method is suitable to be applied when a common oil and gas reservoir numerical simulation method sinks into misconvergence.

The invention provides a coal/shale isothermal adsorption experiment method. The method is carried out by a reference kettle, a sample kettle and a middle region of an experiment device; a sample to be detected is placed in the sample kettle and an experiment temperature is set to be constant according to actual stratum conditions; the sample kettle is calibrated to obtain a free space volume of the sample kettle; the reference kettle and the sample kettle are vacuumized to obtain the initial pressure of the sample kettle; the middle region is communicated with the reference kettle and the middle region is separated from the sample kettle; enough amount of adsorbate gas is injected into the reference kettle one time; after the pressure in the middle region is balanced with the pressure in the reference kettle, the initial pressure of the reference kettle is obtained; an adsorption experiment is carried out to obtain the pressure of the reference kettle and the pressure of the sample kettle after adsorption is balanced; according to a mass conservation principle before and after each time of adsorption, the adsorption amounts under different sample kettle pressures after a plurality of times of adsorption balance are obtained by using the initial pressure of the sample kettle, the initial pressure of the reference kettle, the free space volume of the sample kettle and the pressure of the reference kettle and the pressure of the sample kettle in an adsorption process.

The invention discloses a harmonic current detection method for a novel active power filter (APF). According to the method, for the acquired voltage of a common connection point in a three-phase power grid voltage unbalanced system, the relationship between the grid-side voltage and the compensated grid-side current is represented through introducing an electrical conductance factor. The effective value of a fundamental positive sequence voltage is calculated according to the power conservation principle of the active power filter. Meanwhile, a lagrangian function between the harmonic content of the power grid current and the power grid voltage is constructed, and a target power grid current is obtained through the method of seeking extreme values. Meanwhile, the difference between the target power grid current and a load current is figured out and then is inverted, so that a compensating current command value is obtained. Therefore, the power control of the active power filter is realized, and a control signal is generated based on the PWM technique. The output of the active power filter is controlled. According to the technical scheme of the invention, the phase voltage in the traditional algorithm is replaced by the fundamental wave positive sequence component of the voltage, so that the compensated current waveform of the system is kept to change synchronously along with the fundamental wave positive sequence component of the voltage. Therefore, the defect in the prior art that harmonics cannot be completely eliminated during the power grid voltage distortion process can be overcome.

The invention discloses a low-pressure economizer energy saving assessment method applied to a power plant heat system. The method includes the steps that step1, the heat balance diagram parameters, generated before a low-pressure economizer is installed, of the power plant heat system are obtained; step2, the heat balance diagram parameters, generated after the low-pressure economizer is installed in a parallel connection or series connection mode, of the power plant heat system are obtained, and in combination with the step1, the change of extraction flow of each stage of is obtained; step3, according to the change, obtained in the step2, of the extraction flow of a heater of each stage, based on the extraction flow conservation principle, the variation of the power capability of a turbine is calculated; step4, the variation of the coal consumption of a power plant is calculated and used for assessing the energy saving quantity of the low-pressure economizer, wherein the larger the variation of the coal consumption of the power plant is, the larger the energy saving quantity of the low-pressure economizer will be. According to the method, the low-pressure economizer can be reasonably installed; the load change of the heater of each stage can be displayed, the influence on the coal consumption of the system from the power of an auxiliary engine can be displayed as well, and therefore calculation results are more real and more reliable.

The invention discloses a method and a device for measuring the viscosity of a high-temperature high-pressure fluid. A tube bank length capillary tube measurement method which is applicable to viscosity measurement of various fluids at different temperature and under different pressure is obtained by extending a classical method for measuring the viscosity of a fluid by using a capillary tube on the basis of a constant flow conservation principle in fluid mechanics. The viscosity of the fluid is mainly calculated by utilizing the difference of pressure drops generated when fluids to be measured which have the same mass flow, temperature and pressure flow through capillary experimental tubes with different lengths under laminar flow conditions. The device which applies the method heats thefluid and preserves heat through external world and a temperature controller is used for automatic control to compensate the heat loss of heat dissipation of the fluid in the flowing process, so thatmore accurate experimental data of the viscosity is obtained. The method and the device are easy to operate, and are applicable to the measurement of the viscosity of fluids under different pressure and at different temperature.

The invention discloses a passenger flow prediction method for integrated passenger transport hub intermodal transport, comprising the following steps: first, dividing the integrated passenger transport hub transport mode; second, dividing the integrated passenger transport hub transport mode; 2, predicting the passenger flow of the main body of the passenger transport; 3, predicting the transferproportion of the connecting traffic; 4, predicting the passenger flow of the connecting traffic; 5, predicting the traffic transfer quantity of the combined transport: according to the arrival-departure conservation principle, the traffic transfer proportion distribution table of the combined transport is obtained through matrix calculation, and the traffic transfer quantity of each combined transport is calculated by multiplying the daily average passenger transfer quantity of each transportation mode by the transfer proportion distribution table. The method standardizes the passenger flow forecasting method of integrated passenger transport hub and fills in the blank of the industry; performs quantitative data analysis, standardized prediction process, avoids the interference of subjective factors, improves design efficiency, shortens the design cycle; conforms to the regional socio-economic and transportation development law, improves the applicability and accuracy of the design results.

The invention relates to an original meter reading data processing method for remote calibration of operating errors of an intelligent electric energy meter. The original meter reading data processingmethod comprises the processing steps that 1, real-time checking is performed; 2, data integrity is checked; 3, data integration is adding of electric energy meter reading data to historical meter reading data of the electric energy meter based on original meter reading data; 4, missing items are processed; 5, data analysis is performed to find out abnormal data; 6, orthogonal checking is performed. The original meter reading data processing method utilizes a flow conservation principle and a big data analysis technology to achieve remote detection of massive online operating electric energymeter errors without standard device adding, meter structure change and electric energy meter cluster topology change. By adopting the method, a correction topology model based on virtual branch circuits is established, wire loss is a variable value, calculation results and change are concerned, 100% reliability of electric energy meter error measurement is achieved, and the electric energy meteris more accurately guided to change work.

The invention relates to an inductive energy storing type pulse power supply for electromagnetic emission, and belongs to the technical field of electromagnetic emission. The pulse power supply comprises a primary power supply Us, a first inductor L1, a second inductor L2, a first thyristor T1, a second thyristor T2, a third thyristor T3, a fourth thyristor T4, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first capacitor C1, a second capacitor C2 and n inducting modules; each inducting module comprises an inductor, a thyristor, a plurality of diodes and a capacitor. According to the inductive energy storing type pulse power supply for electromagnetic emission, the inductors can be highly coupled; the inductor current is multiplied according to the magnetic flux conservation principle and can be also amplified due to series charging and parallel discharging of each inductor, and therefore, high-current multiplying is achieved; the variation rate of the current can be reduced to lower down the withstand voltage of a main pipe; meanwhile, the inductive energy storing type pulse power supply has the advantages of being high in energy storing density, high in structure expandability, and suitable for electromagnetic emission.

The invention discloses a method for automatically acquiring initial reeling and unreeling radius of reel material printing equipment. The method for automatically acquiring the initial reeling and unreeling radius of the reel material printing equipment includes that feeding manually, guaranteeing that there is no material belt redundancy between an unreeling traction unit, an n-color printing unit and a reeling traction unit, eliminating the material belt redundancy of the unreeling region and the reeling region, emptying encoder values of servo motors of each unit, forwardly rotating the servo motor of the unreeling unit by one circle, recording the encoder value thereof, re-eliminating the material belt redundancy of the unreeling region and the reeling region, respectively recording the encoder values of the servo motor of the unreeling traction unit and the servo motor of the unreeling unit, and calculating the initial radius of an unreeling and reeling roller according to a material belt length conservation principle. The method for automatically acquiring the initial reeling and unreeling radius of the reel material printing equipment solves the problems of low efficiency and obvious error of a direct measurement method, improves the equipment control precision, and improves the automatic degree and production efficiency of the equipment.

The invention provides a power-driven unicycle which mainly changes the steering mode of the existing unicycle product in the market; a left steering handlebar rod and a right steering handle rod are arranged under a seat and are fixedly connected with a supporting frame in a matching way so as to lead the steering mode of the power-driven unicycle to be similar to a conventional bicycle; and as the steering mode is well known by a majority of persons, a beginner is easy to learn and master the driving technique of the power-driven unicycle. In addition, according to the conservation principle of angular momentum, a legrest connecting rod which extends to the front of a wheel is arranged so as to increase the rotating radius of a body of an operator around a vertical axis and improve the capacity of preventing the undesirable spinning or rotation. In addition, the invention also proposes a structure installation method which can lead the seat of the operator to tend to the non-steering position returning to the center and facing the front. Therefore, the stability and the operating performance of the power-driven unicycle are improved.

The invention discloses a combined exploitation gas mixed source proportion quantitative determination method of a coal seam group. The combined exploitation gas mixed source proportion quantitative determination method comprises the steps of dividing master control gas constituents of representing different target coal layers by measuring conventional gas constituent content, an isotope value thereof, rare gas constituent content and an isotope value thereof in a gas of each target coal layer control point in a control region and by an isotope geochemistry method; performing fitting to obtain master control gas constituent content and an isotopic contour map; obtaining main control gas constituent content and an isotope value thereof of each target coal layer of a combined exploitation driving hole by an interpolation method; and building a calculation model according to a chemical composition mass conservation principle, and quantitatively determining a mixing ratio of each target coal layer in the mixed source gas. By the method, the mixed source proportion of different target coal layers in the combined exploitation gas can be accurately calculated, the problem that the mixed source gas under a coal mine cannot be quantitatively determined is solved, a theoretical basis is provided for standard-reaching evaluation of coal layer gas exploitation, and the mine production safety is effectively guaranteed.

The invention relates to a method for evaluating the dynamic stability of foam in a rock core oil-displacing process, and belongs to the technical field of improvement of oil recovery through foam flooding. In the prior art, foam flooding can significantly improve crude oil recovery, and the stability of foam is a key factor affecting the wide use of the foam flooding technology; the current method for evaluating the stability of foam is mainly a static evaluation method; and in the actual oil displacing process, the foam is subjected to the dynamic process comprising continuous defoaming andcontinuous foam generating, such that the stability of the foam during the oil displacing cannot be truly reflected by using the static evaluation method. According to the present invention, based onthe nuclear magnetic resonance technology and the mass conservation principle, the gas-liquid mass ratio relationship between the inlet end and the outlet end of the rock core is established, and thedynamic instability factor of the foam is defined, wherein the dynamic instability factor of the foam can evaluate the dynamic stability of the foam during the oil displacing of the rock core, and theproblem that the dynamic stability of the foam cannot be evaluated during the oil displacing of the rock core for a long time can be solved.

The invention discloses a method for determining the retention rate of a fluorescent whitening agent in a pulp fiber system by utilizing an ultraviolet spectrophotometer, namely the amount of the fluorescent whitening agent in a filtrate is quantified through the ultraviolet spectrophotometer, and the retention rate of the fluorescent whitening agent in the fiber system is calculated based on a mass conservation principle. The determination method comprises the following steps of production of a standard curve, collection of the filtrate, pretreatment on the filtrate, determination of the ultraviolet spectrophotometer, determination of a blank sample, and calculation, and a determined result has smaller deviation and good reproducibility. The invention is the method with simplicity, easy operation and good reproducibility for determining the retention rate of the fluorescent whitening agent on the surface of pulp fiber.

The invention discloses a PWM (Pulse-Width Modulation) rectifier fuzzy sliding mode variable structure control method when the three-phase network voltage is unbalanced, and belongs to the field of power electronics application. The method comprises the following steps of firstly sampling the direct current side voltage of a rectifier; obtaining a rated active power through a PI (Proportional-Integral) controller; sampling the network voltage and the rectifier current, and using a trap filter for performing positive and negative sequence decomposition on the sampling data; listing and writing the power matrix of the rated values by using the rated power conservation principle; obtaining the rated current through a generalized inverse matrix conversion formula; and finally, obtaining a space voltage vector by the fuzzy sliding mode variable structure control method on an electric current loop. The control method has the advantages that the current loop uses the variable structure control, so that the robustness and the dynamic performance of a system can be enhanced; meanwhile, the variable structure coefficient is regulated through fuzzy operation on state points; the adverse influence due to buffeting is reduced; and the stability of the system is improved.

The invention relates to a method for calculating an organic carbon recovery coefficient of biogenic gas source rock. The method includes steps: firstly, methane is taken as a main component in biogenic gas, carbonic molecules in other components include heavy hydrocarbon and carbon dioxide, the heavy hydrocarbon low in content is negligible according to a carbon element conservation principle, and to be simplified, organic carbon consumed in original hydrocarbon source rock is completely converted into generated methane and carbon dioxide; secondly, a carbon element conservation relation is established, and the original organic carbon content is equal to the amount of residual organic carbon content, generated methane carbon content and generated carbon dioxide carbon content; thirdly, acalculation relation among the organic carbon recovery coefficient, organic carbon gas generating rate and carbon dioxide content in products is established, and a calculation formula of the organic carbon recovery coefficient is obtained. The method is helpful to accurate calculation of biogenic gas resource quantity and planar resource abundance and has guiding significance to determination of favorable exploration areas.

The invention discloses a device and method for gyroscopic type energy conversion for space docking. The energy conversion device can convert kinetic energy generated by a relative speed into rotating kinetic energy of the device through gyroscopic rotation when spacecrafts which have a large speed difference in space docking collide and are combined to be a whole, and thus this part of redundant energy is stored. The energy conversion process of the device is based on the mechanical energy conservation principle, it is guaranteed that the relative linear speeds of the two spacecrafts in rendezvous and docking in the space rendezvous and docking process are small enough, and the device and the method can be applied to rendezvous and docking tasks between the spacecrafts having large relative speeds.

The invention discloses a minimum wetted perimeter volute section numerical value solving method based on a speed moment conservation principle. When all section of a volute are solved through the speed moment conservation principle, the target of reducing the wetted perimeter, namely the friction area, of the sections is persisted, and thus the hydraulic efficiency of the volute can be easily improved. Two symmetrical straight lines are still used on the lower portions of the sections of the volute on the axis face to form an axis face stream line without a turn, compared with a traditional trapezoid section, the difference that a circular arc in tangent to the two straight lines replaces the structure of two transition circular arcs exists, and the perimeter of the volute is obviously reduced than that of the traditional structure. By means of the two-straight-line type waist at the lower portion of the section mode, water flow entering the volute from an impeller can be prevented from disengaging, the arch formed by the upper single circular arc reduces the section wetted perimeter, and the friction loss of the water flow along the pass is reduced. The numerical value solving method and process for calculating and acquiring all geometric dimensions of the novel section are provided, meanwhile, the stress distribution in the volute becomes more even through the structure, and a possibility is provided for reducing the wall thickness of the volute.

The invention discloses a method of calculating a reduction factor of fresh air quantity of an air supply vertical shaft for tunnel opened circulatory ventilation. The method mainly includes: an equivalent fresh air quantity calculation formula for a circulatory flow that flows through a dust remover and is purified; in a controllable circulatory ventilating system, allowing quantity of fresh airinto the air supply vertical shaft to be equal to quantity of discharged polluted air from a discharge vertical shaft, and determining a calculation formula for equivalent quantity of fresh air sent by the air supply vertical shaft; in the controllable circulatory ventilating system, determining a calculation formula for equivalent quantity of fresh air discharged by the discharge vertical shaft;applying the three formulas above in the controllable circulatory ventilating system according to the conservation principle of physics so as to obtain a calculation formula of equivalent quantity offresh air for an ejector segment of a circulatory air duct; acquiring, from the calculation formula, a calculation formula for a reduction factor of fresh air quantity of the air supply vertical shaftin the controllable circulatory ventilating system. When the reduction factor of the fresh air quantity of the air supply vertical shaft in the open controllable circulatory ventilating system is less than 1, the controllable circulatory ventilating system can be executed to reduce actual air supply-discharge quantity.

The invention relates to a heat-exchange dehumidification method of a tobacco baking device, and relates to the technical field of tobacco baking. According to electric power consumed in the running process of a sealed dehumidification heat pump, due to a power conservation principle, one part of energy is finally converted into heat so as to be carried into a drying room along air circulation, so that the temperature of a drying room is improved; and in addition, according to a tobacco drying process, constant temperature and constant humidity need to be kept in a specific time period, a surface air cooler is additionally arranged in a drying system, and heat is taken away through circulating water in the surface air cooler and a cooling tower, so that on one hand, the temperature in the drying room is ensured to be adjustable and a baking process of tobacco leaves is met, and on the other hand, most sensible heat of return air is taken away, the cooling capacity of a dehumidification system is indirectly increased, and finally the dehumidification efficiency of the dehumidification heat pump is improved.

The invention discloses a power system probabilistic power flow calculation method based on the probability conservation principle. The method comprises the following steps of: obtaining various dataof a power system network containing new energy; performing statistical analysis on the historical data of the conventional generator output, the new energy output and the load power, and generating aprobability model of injection power of all nodes of the power system; establishing a linearization model of a power system power flow calculation equation; establishing relational expressions amongprobability density functions of different random variables based on a principle of the probability conservation principle in a probability theory according to a relation of a linear equation; and processing the relational expressions among the probability density functions of different random variables by utilizing the definition and the property of the delta function to generate probability density functions of node voltage, branch power flow and branch active loss in the power system. According to the method, an accurate probability power flow calculation result can be obtained, the probability characteristics of node voltage, branch power flow and branch active loss in the system are reasonably reflected, and the calculation efficiency is high.