488results about "Volume variation compensation/correction apparatus" patented technology

The invention belongs to the technical field of flowmeter verification, and discloses a two-phase flow analysis system and method based on a differential pressure flowmeter and an electromagnetic flowmeter. The method comprises the steps that a differential pressure flow meter and an electromagnetic flow meter are arranged on adjacent sections of a pipeline, the electromagnetic flow meter collects voltage signals and analyzes the voltage signals to obtain liquid phase volume flow, and liquid phase mass flow is obtained by combining temperature correction; the differential pressure flowmeter calculates the gas density by using an ideal gas law according to the temperature and the pressure; inputting multi-sensor time sequence data into the weight optimization model, and optimizing the volume gas content and the total mass flow rate; baseline parameters are calibrated during full-pipe single-phase flow to obtain zero drift, and real-time temperature and pressure dynamic correction are combined, so that the metering precision and the working condition adaptability are improved; the problem of verification deviation of a traditional flowmeter is solved, high precision and high reliability of complex gas-liquid two-phase flow metering are achieved, and efficient and reliable technical support is provided for two-phase flow precise metering and process control in the fields of chemical engineering, energy and the like.

The invention discloses a high-precision electromagnetic water meter system based on an adaptive algorithm and a measuring method thereof, and relates to the technical field of water meters, the high-precision electromagnetic water meter system comprises a signal acquisition unit, a signal processing and adaptive unit, a data processing and control unit, an abnormity early warning unit, a communication and data management unit and a system operation, maintenance and optimization unit. According to the system, electric signals are subjected to amplification, filtering and analog-to-digital conversion processing, strong signal overload can be avoided, various noise interferences can be removed, electromagnetic interferences in data transmission are reduced, stability during data transmission is guaranteed, fluctuation and distortion of the signals are reduced, an algorithm is automatically matched through an algorithm matching module, and the accuracy of data transmission is improved. The dynamic adjustment and continuous processing module is used for dynamically adjusting parameters and continuously processing signals, so that the parameter adjustment and the signal processing are interlaced to form a cyclic optimization process, the signal processing effect is continuously improved, errors of measured data are reduced, and high-precision measurement of micro flow is achieved.

The invention relates to the technical field of flow measurement, and discloses a multiphase flow flowmeter dynamic compensation system, which comprises a multi-modal data acquisition module, a dynamic compensation module and a dynamic compensation module, the feature extraction and standardization module performs frequency domain conversion and feature extraction on the data to generate a fusion feature matrix; the graph structure modeling module constructs a graph model based on the fusion features and extracts graph feature vectors; the compensation optimization module obtains an optimal compensation parameter through Bayesian optimization; the flow estimation module generates a compensated flow value according to the optimal compensation parameter; and the adaptive feedback module calculates a flow residual error and updates the graph structure modeling module and the compensation optimization module. By introducing a dynamic compensation and self-adaptive feedback mechanism, the method can adapt to the change of the flowing state of the multiphase flow in real time, the precision and stability of flow estimation are effectively improved, the problem that a traditional method is difficult to quickly respond to flow pattern change and working condition fluctuation is solved, and the real-time performance and reliability of flow measurement are remarkably improved.

The invention provides a two-phase flow measurement method based on differential pressure capacitance sensing and data knowledge driving. The two-phase flow measurement method comprises the steps that throat extension design is conducted on a standard Venturi tube; a multi-layer capacitive sensor array is embedded into a long-throat-neck Venturi tube, various transmitters are installed on the tube, and differential pressure, temperature and pressure data of the various transmitters are synchronously acquired by using a multi-channel data acquisition module; a configured capacitive sensor array excitation-measurement module is utilized to synchronously acquire capacitor array data; developing a gas-liquid two-phase flow calculation model based on data knowledge driving, and packaging the gas-liquid two-phase flow calculation model in a two-phase flow calculation module; capacitance, differential pressure, temperature and pressure data are input into a two-phase flow calculation module, and field learning is carried out by utilizing actually measured data, so that gas-liquid two-phase flow on-line real-time calculation is realized. The problem that time and space of data measured by traditional tandem type multiple sensors are inconsistent is solved, and the problem that when a traditional venturi tube is used for measuring two-phase flow, the phase volume fraction is lost is solved.

The invention discloses a double-frequency anti-interference ultrasonic water meter and a metering method thereof, and relates to the technical field of fluid metering. A 500kHz sound velocity reference channel is constructed in a self-transmitting and self-receiving mode of a single transducer, the sound path length under solidified pure water is calibrated through a factory, the current water quality sound velocity is calculated in real time in a zero flow state, the zero offset of a 1MHz main channel is dynamically corrected, and a high-precision temperature sensor is omitted. Meanwhile, online water quality diagnosis is realized by utilizing a double-frequency cooperation mechanism: turbidity is quantized according to the amplitude ratio of 500kHz and 1MHz signals (based on the characteristics of high-frequency scattering sensitivity and high low-frequency penetrability), and bubbles are detected according to the time domain volatility of the 1MHz signals; and dynamically optimizing the flow metering precision of the main channel according to a diagnosis result by combining a sound velocity compensation model (the sound velocity is inversely proportional to the turbidity) and a graded bubble compensation model (the sound velocity or the flow is corrected according to the volatility). According to the method, medium interference is effectively overcome, measurement reliability is improved, and real-time monitoring and reporting of basic water quality (turbidity and bubbles) are achieved at low cost.

The invention relates to the technical field of water meter flow, in particular to an ultrasonic water meter flow curve fitting system, which is characterized in that an edge computing device is used for primarily processing original data at a data acquisition end, a mean filtering algorithm is used for removing noise data, and the data after acquisition is subjected to filtering, denoising, abnormal value elimination and normalization processing; a dynamic evaluation model is constructed by adopting a time sequence prediction algorithm, the model calculates and predicts various data of future ultrasonic water meter flow by continuously inputting real-time data, and the model is optimized according to a prediction result, so that errors of the model are continuously reduced in the training process, and the prediction accuracy of the model is improved; modeling and fitting are conducted on the flow curves, calculated by the neural network model, of the ultrasonic water meter in different working states through the fitting model, the fitted curves can serve as a basic data source of a user water consumption behavior and system load characteristic advanced analysis model, and energy-saving analysis and fault positioning are facilitated.

The invention discloses an ultrasonic water meter measurement correction method based on fluid parameter coupling. The method comprises the following steps: collecting multiple parameters in real time; dynamically matching fluid physical property parameters; calculating a dynamic correction factor; and sound velocity temperature correction and flow output. The multi-parameter coupling correction enables the measurement precision to be obviously improved, the applicability is wider, and the real-time performance and the stability are stronger; the problems that according to an existing ultrasonic water meter temperature compensation scheme, the nonlinear influence of fluid viscosity change caused by temperature change on the sound velocity is not considered, the coupling effect of flow velocity distribution and the Reynolds number (Re) is ignored, and errors are obvious in the scene of high-viscosity fluid (such as oil-water mixed liquid) are solved.

The invention discloses a self-adaptive metering method of an ultrasonic water meter, which relates to the field of water meter metering, and comprises the following steps: acquiring real-time water temperature data and real-time flow velocity data of a measured fluid, compensating the sound velocity of ultrasonic waves based on the real-time water temperature data to obtain a first compensated sound velocity, based on the first compensation sound velocity, an excitation voltage self-adaptive adjustment strategy with ultrasonic wave head-wave ratio regulation and control and a measurement frequency dynamic regulation and control strategy are executed, secondary compensation is conducted through a built error curved surface compensation model with the water temperature and the flow velocity as indexes, and the initial flow value is corrected through an error compensation value; by means of multi-parameter collaborative real-time optimization, high-precision measurement and low-power-consumption operation under all working conditions are achieved, the measurement precision in the full-scale and full-temperature range is remarkably improved, and by intelligently adjusting the measurement frequency, cooperating with the flow rate change rate and error model feedback and dynamically balancing the dynamic response speed and static power consumption, the measurement precision is improved. And finally, double optimization of precision and energy efficiency is achieved.

The present invention is configured to calculate a flow rate across a wide range of flow rate, from a low range to a high range, and includes: a fluid resistance element provided to a channel; an upstream pressure sensor that detects an upstream pressure with respect to the fluid resistance element; a downstream pressure sensor that detects a downstream pressure with respect to the fluid resistance element; and a flow rate calculation unit that calculates a flow rate based on the upstream pressure and the downstream pressure, in which the flow rate calculation unit calculates the flow rate based on viscous resistance, inertial resistance, and a degree of effect of rarefaction.

The invention provides a temperature compensation method and system of a mass flowmeter, and relates to the technical field of mass flowmeters.The method comprises the steps that a space temperature field and a strain field covering a whole measuring pipe body are obtained, and a distributed heat-force coupling state is constructed; configuring a primary disturbance parameter set, projecting the primary disturbance parameter set to a natural vibration mode space, and constructing an equivalent temperature disturbance quantity; configuring the excitation frequency of dual-frequency vibration excitation; inputting a double-frequency response result into a temperature-flow decoupling model, and inversely constructing a temperature compensation factor; calculating an original estimated value of the flow, constructing a temperature compensation amount, fusing the original estimated value of the flow, and outputting a measurement result. The technical problem that in the prior art, due to the fact that single-point temperature measurement cannot accurately decouple the temperature effect under the complex working condition, measurement of the mass flow meter is inaccurate is solved, the space temperature field and the strain field of the whole measurement pipe body are obtained, self-adaptive compensation is conducted on sensitivity drifting of the measurement pipe, and the measurement accuracy is improved. And the measurement precision of the mass flow meter is improved.

A flow sensor for sensing fluid flow. The flow sensor includes an exterior, interior, a circuit board, and first and second ports. The first and second ports permit fluid to flow into and out of the interior. A Hall Effect Sensor in the interior detects the number of revolutions of an impeller. An electric coupler interfaces with the flow sensor and a transmitter for communication of the revolutions of the impeller to a controller. The controller determines the rate of fluid flow in a conduit. The controller issues a command signal to a component of a hydraulic system to alter the rate of fluid flow in the conduit.

The invention discloses an ultrasonic water meter flow measurement method and system based on dynamic temperature compensation, and relates to the technical field of ultrasonic water meter flow measurement. According to the ultrasonic water meter flow measurement method based on dynamic temperature compensation, flow measurement time sequence data in a set area are continuously obtained, feature extraction processing is carried out respectively, an initial flow measurement value, a temperature compensation factor and a measurement interference suppression factor of each sampling period in the set area are obtained, comprehensive analysis is carried out, and the flow measurement time sequence data are obtained. According to the method, intelligent alarm is carried out on the set area based on the actual flow measurement value of each sampling period, so that the original measurement result is dynamically corrected, and a more accurate actual flow value is formed; the reliability and the long-term stability of flow measurement in complex environments such as severe temperature difference and fluctuating flow state are improved, and then the accuracy and the usability of flow monitoring in scenes such as hot spring areas and industrial heat exchange pipelines are guaranteed.

The invention relates to the technical field of flow measurement, and discloses a ship fuel consumption whole-process online monitoring system and method.The system comprises a data acquisition module, a data regulation module, a temperature compensation module, a fuel consumption abnormity monitoring module, an energy efficiency evaluation analysis module and a data communication reporting module, and fuel flow and temperature data of a ship are acquired in real time; and a standardized data set is obtained after data normalization. According to the real-time fuel oil temperature, temperature-density coupling compensation is carried out on the volume flow, the volume error caused by thermal expansion and cold contraction is eliminated, and therefore the net fuel oil consumption is calculated. The consumption is compared with a preset fuel consumption threshold value in real time, and if the consumption continuously exceeds the threshold value, a fuel consumption abnormity identifier is generated. Afterwards, energy efficiency grade evaluation is carried out on the fuel oil use efficiency in combination with the real-time navigation state of the ship to obtain an energy efficiency analysis result, and the energy efficiency analysis result is transmitted to a remote monitoring platform through a ship communication channel; according to the invention, the accuracy of ship fuel consumption whole-process online monitoring can be improved.

The invention discloses an automatic temperature compensation circuit and method based on a thermal flowmeter, and relates to the technical field of temperature compensation, and the compensation circuit comprises a constant current source module used for driving the thermal flowmeter; the Wheatstone virtual bridge arm is used for acquiring a changed digital-to-analog converter output voltage value output by the controller, and performing voltage conversion on a first voltage and a second voltage which are output on the thermal flowmeter due to the change of the external temperature according to the output voltage value to obtain a third voltage; the digital-to-analog converter is used for performing correction compensation on the third voltage according to the correction compensation value calculated by the controller; and the differential amplification module adopts a differential amplifier to amplify the third voltage and the fourth voltage output by the thermal flowmeter, and outputs a compensated flow signal. The compensating circuit is simple in structure and higher in reliability and precision, and compared with a digital potentiometer, the output value of the Wheatstone virtual bridge arm is changed by using the output value of the digital-to-analog converter, so that the adjusting resolution is higher.

The utility model discloses a sound path length self-correcting ultrasonic flowmeter which comprises a flowmeter measuring host, a plurality of flow velocity measuring ultrasonic transducers with temperature sensors, a plurality of flow velocity measuring ultrasonic transducers and a signal cable, and the flow velocity measuring ultrasonic transducers and the flow velocity measuring ultrasonic transducers with the temperature sensors are matched in pairs. The flow velocity measurement ultrasonic transducer and the flow velocity measurement ultrasonic transducer with the temperature sensor are connected with the flowmeter measurement host through a signal cable according to the definition of an instrument. The flowmeter host has the functions of temperature measurement, sound path length self-correction and flow velocity and flow measurement. The installation and construction requirements of the time-difference method ultrasonic flowmeter are further simplified, and the installation and construction cost is reduced; after the instrument is installed in a water body, the instrument automatically measures the water temperature and corrects the sound path length measurement error, the flow measurement precision is high, and the anti-interference capacity is high.

A system for operating a flow meter in a fluid pipeline comprises at least one flow conditioner or mixer: at least one flow meter: a pair of pressure sensors or transmitters, to measure a differential pressure of the at least one flow conditioner or mixer; at least one further pressure sensor or transmitter that measures a fluid pressure in the pipeline; and at least one temperature sensor for measuring a fluid temperature in the pipeline. A method for operating the flow meter is also provided.

A meter electronics (20) for selecting a measurement correction method is provided. The meter electronics (20) comprises an interface (501) configured to communicatively couple to a sensor assembly (10) and receive sensor signals from the sensor assembly (10) and a processing system (502) communicatively coupled to the interface (501). The processing system (502) is configured to store two or more measurement correction methods, wherein the two or more measurement correction methods compensate for multiphase effects of a multiphase fluid in the sensor assembly, determine one or more process parameter values, and select one of the two or more measurement correction methods based on the one or more process parameter values.

The invention relates to the technical field of ultrasonic metering, and particularly discloses a reciprocity-based ultrasonic metering structure, metering method and meter, the metering structure comprises a measuring pipe section, a first transducer and a second transducer, the first transducer and the second transducer are used for receiving or transmitting ultrasonic pulses; two ports of the measuring pipe section are respectively communicated through a first pipeline and a second pipeline which are connected in parallel, the first pipeline is provided with an inlet for a metered object to enter the measuring pipe section, and the first pipeline on two sides of the inlet is respectively provided with a first valve body and a second valve body; an outlet is formed in the second pipeline so that a metered object can be discharged from the measuring pipe section, and a third valve body and a fourth valve body are arranged on the portions, on the two sides of the outlet, of the second pipeline respectively. According to the metering method, the metering structure is adopted. The ultrasonic wave meter adopts the ultrasonic wave metering method based on reciprocity. The structure is reasonable, the design is ingenious, the measurement precision is greatly improved, and the production cost is reduced.

The invention discloses a pipeline flow metering device, and belongs to the technical field of flow meters. A pipeline flow metering device comprises a measuring pipe body, a front flow guide assembly, a turbine measuring assembly and a rear flow guide assembly are arranged in the measuring pipe body, the rear flow guide assembly is of a damping grid structure formed by perforated plates, and the two ends of the turbine measuring assembly are connected with the front flow guide assembly and the rear flow guide assembly respectively. According to the pipeline flow metering device, the shaft-mounted vibrator and the rotor built-in vibrator are integrated, dirt on the turbine rotor and the turbine shaft can be automatically removed under the condition that the pipeline flow metering device is not detached, the maintenance frequency and the maintenance cost are reduced, the working temperature of the magnetostriction rods and the magnetostriction laminations is effectively reduced by adopting the water-cooled jackets and the heat dissipation fins, and the working efficiency of the magnetostriction rods and the magnetostriction laminations is improved. The stability and reliability of the system are improved, and the service life is prolonged.

The invention discloses an electromagnetic water meter error compensation method and system combining conductivity and temperature, and the method comprises the steps: analyzing the change trend of the actual flow velocity through a prediction result, and constructing a trend vector 1; subtracting a numerical value of the prediction result from a measured value, analyzing the change trend of the differential flow velocity, and constructing a trend vector 2; performing feature analysis and feature compensation on the current evolution process according to transfer learning of historical data on the evolution process, and combining a compensation vector after feature compensation with the trend vector 1 to obtain a compensated trend vector 1; and correcting the curve of the prediction result by using the compensated trend vector 1 to obtain an error compensation result of the electromagnetic water meter. The compensated flow velocity data better fits the actual physical state, has higher robustness and generalization ability, and can effectively meet the requirements of intelligent water affairs, industrial metering and the like for high-precision and full-time-domain monitoring.

The invention relates to an inner cone type differential pressure flowmeter based on multi-parameter compensation. The flow meter aims to solve the technical problem that an existing flow meter is greatly influenced by fluid parameters. According to the technical scheme, the device comprises a constant flow unit, a testing module, a transmitter module and a data processing module, a temperature measuring element and an inner cone throttler are arranged on the upstream inner wall and the downstream inner wall of a measuring pipeline in the fluid direction, the transmitter module comprises a temperature transmitter, a pressure transmitter and a differential pressure transmitter, the temperature transmitter is electrically connected with the temperature measuring element, and the pressure transmitter is electrically connected with the differential pressure transmitter. The pressure transmitter is electrically connected with a pipeline, the differential pressure transmitter is electrically connected with the head end and the tail end of the inner cone throttler, the data processing module comprises an adder, a multiplier and a squarer, the temperature transmitter, the constant current unit and the pressure transmitter are connected with the adder, the adder and the differential pressure transmitter are connected with the multiplier, the multiplier is connected with the squarer, and the squarer is connected with the output unit. Errors caused by fluid physical property parameter changes can be eliminated to the maximum extent through measured values, and the measurement precision is greatly improved.

The invention relates to a coal flow detection system and a control method thereof, and the system is characterized in that the system specifically comprises the following modules: a weighing detection module, a speed detection module, a temperature compensation module, a data processing module, a communication module, an alarm module, a power management module and a display module; the weighing detection module is connected with a differential input interface of the data processing module through a full-bridge strain circuit; the speed detection module is connected with a timer capture unit of the data processing module through an orthogonal encoder interface; the temperature compensation module is connected with a sensor interface of the data processing module through a digital bus; the data processing module communicates with the communication module and the display module through a high-speed serial interface; the alarm module is connected with the data processing module through an isolated digital output interface. The problem that an existing detection method only depends on single weighing or speed measurement, the actual situation of the coal flow cannot be comprehensively and accurately reflected, and consequently the measurement result error is large is solved.

The invention discloses an ultrasonic water meter flow measurement and correction system based on Internet of Things, which relates to the technical field of water meter monitoring and comprises a sensing unit, a working data processing unit, a factor determination and analysis unit, a user management unit and an abnormity alarm unit. According to the invention, the sensing unit is used for multi-dimensionally collecting the working related data of the ultrasonic water meter, the working data processing unit is used for real-time processing and interference suppression, the quality of the obtained working data of the ultrasonic water meter can be improved, and the factor determination and analysis unit is used for determining the working data of the ultrasonic water meter by screening the performance related characteristics of the water meter, predicting the performance change trend and adjusting model parameters. The user management unit is convenient for a user to inquire data; the abnormal alarm unit ensures stable operation of equipment; the flow measurement precision can be improved on the whole, the system adapts to complex working conditions, intelligent management and fault early warning are realized, and powerful data support is provided for water affair management.

The invention belongs to the technical field of pipeline flow monitoring, and particularly relates to a long-distance water delivery pipeline flow monitoring method fused with terrain dynamic compensation, which comprises the following steps: selecting a long-distance water delivery pipeline reference point, and synchronously acquiring reference flow and static pressure; based on a multi-source data fusion technology, constructing a pipeline terrain elevation parameter model, generating a three-dimensional terrain matrix, calculating an elevation difference, a gradient and a curvature radius, and constructing a terrain correction matrix; on the basis of Darcy formula correction, down-slope section kinetic energy suppression and a down-slope section pressure compensation algorithm, head loss is corrected, potential energy conversion errors are suppressed, and water hammer effect interference is eliminated; the flow in the pipeline is corrected through edge calculation, and global flow balance verification is carried out; and pipe bursting or leakage points are positioned in an auxiliary manner based on an integrated visual platform. According to the method, the measurement precision of the pipeline flow under the complex terrain is effectively improved, and a high-precision and all-terrain self-adaptive intelligent monitoring and early warning platform is provided for a long-distance water conveying pipeline.

A mass flow meter includes a flow pathway through the mass flow meter, wherein the flow pathway comprises a first cavity and a second cavity. The mass flow meter also includes a laminar flow element adjacent to the first cavity and the second cavity, wherein the first cavity is upstream of the laminar flow element and the second cavity is downstream of the laminar flow element. A pressure transducer is positioned in at least one of the first cavity or the second cavity, wherein the pressure transducer includes at least one diaphragm and measures linear and non-linear responses of the at least one diaphragm to a first pressure to determine a voltage signal indicative of a pressure. The mass flow meter converts the pressure reading obtained from the pressure transducer into a signal indicative of a mass flow rate through the laminar flow element.

The application discloses a vortex frequency extraction and moisture phase separation flow measurement method combined with disturbance wave frequency characteristics, including a conductance ring sensor and a vortex flowmeter, comprising: a pressure sensor, a conductance ring sensor, a vortex flowmeter, a temperature sensor, an excitation electrode, a measurement electrode, a vortex generator, a piezoelectric probe, temperature, pressure and vortex signals s(t) are collected by a collection card, liquid film fluctuation signals δ(t) are collected by a high-speed AD-DA module and an FPGA, the conductance ring sensor 2 is used for dynamically monitoring the change of the liquid film thickness of the pipe wall, and then the fluctuation frequency, i.e., the disturbance wave frequency, is extracted, the vortex flowmeter is used for dynamically monitoring the vortex frequency, the relationship between the disturbance wave frequency characteristics and the vortex stability is utilized, and the extraction precision of the moisture two-phase vortex characteristic frequency is improved. The application utilizes liquid film fluctuation frequency information to extract the vortex frequency and correct over-reading, does not need to calibrate the liquid film thickness, has low requirements on the medium conductivity, and has a wide range of measurement medium.

The invention relates to the technical field of flow metering, in particular to a flow metering method and system for an ultrasonic water meter, and the method comprises the steps: analyzing an actual signal and a simulation signal of the ultrasonic water meter through an excitation transducer and a signal simulation module, and obtaining a signal effective time difference and an effective signal set of the ultrasonic water meter; obtaining a corrected ultrasonic propagation speed according to an ultrasonic propagation expression and the effective signal set, further analyzing an attenuation influence coefficient and constructing a flow prediction model; obtaining a flow velocity distribution compensation analysis model according to the flow velocity distribution compensation factor and the effective signal set, and deducing the analysis model to obtain a flow analysis model based on flow velocity distribution; the flow prediction model and the flow analysis model are combined to establish the all-working-condition flow analysis model, the all-working-condition flow analysis model comprehensively considers factors such as ultrasonic propagation characteristics, signal attenuation and flow velocity distribution, different measurement working conditions and environment conditions can be adapted, and accurate flow calculation is achieved.

The invention discloses a high-precision detection method and device for liquid flow, and relates to the technical field of flow detection. The method comprises the following steps that n detection terminals are connected in series in a pairwise end-to-end mode, a processing unit numbers the detection terminals in sequence according to the series connection sequence, the first detection terminal and the last detection terminal which are connected in series are communicated with a detected pipeline, the installation position of an ultrasonic flow sensor is adjusted with the vertically downward direction as a reference line, and the detection terminals are connected in series. The detection terminals are sequentially calibrated in a series connection mode, the larger the number value of the detection terminals is, the more accurate the detected flow information is, the detection precision of the flow of the fluid without the components in the pipeline is improved, and the detection accuracy of the flow of the fluid without the components in the pipeline is improved by setting the unit time t. Each detection terminal can dynamically adjust the section state in real time, and real-time updating can enable the detection terminal to still maintain the detection precision under the condition of mixed fluid.

The invention discloses metering equipment and a method for metering gas flow by using an ultrasonic sound velocity difference principle, and the method comprises the following steps: rectifying gas flow in a pipeline by using a rectifier assembly to stabilize a flow field, and then measuring the ultrasonic sound velocity difference of forward and reverse propagation of the gas flow by using an ultrasonic sensor in a sensing assembly; the detected pulse signals are transmitted to the intelligent flow totalizer assembly for operation, and the actual flow velocity and flow of the gas are obtained; a pressure sensor and a temperature sensor in the sensing assembly respectively collect a pressure signal and a temperature signal of gas in the pipeline, and synchronously transmit the collected pressure signal and temperature signal to the intelligent flow totalizer assembly; and after receiving the pressure and temperature signals, the intelligent flow totalizer assembly performs temperature and pressure compensation operation in combination with actual flow velocity and flow data of the gas to finally obtain the flow velocity and flow of the gas under the standard condition. The problems of low measurement precision and large pressure loss in the traditional technology are solved.