Simulation Study of Thermal Gas Mass Flow Meter

Traditional natural gas flowmeters mainly use volumetric measurement, which is easily affected by natural gas pressure and temperature, and cannot reflect the composition change (quality change) of natural gas. In addition, the existing measuring instruments cannot measure the relatively small flow well, and there are problems such as saturation for the relatively large flow, which seriously affects the accuracy of measurement. This article introduces a sensor system based on mems technology based on the principle of heat transfer. The sensor system designed with mems technology has small volume, high measurement accuracy and small error, and can measure the mass flow rate of gas in the pipeline. The flow field is simulated by fluent simulation technology, and the best measurement position in the pipeline is found by simulating different insertion positions of the sensor, and the simulation results are verified by experiments to ensure the accuracy of the simulation results and improve the measurement accuracy of the sensor. 1. Design principle of thermal gas mass flowmeter Thermal gas mass flowmeter has a variety of measurement principles. This article introduces a new type of thermal gas mass flowmeter designed based on the principle of thermal diffusion, based on King's law, and combined with modern microelectronics technology. Thermal gas mass flow meter. Its working principle is shown in Figure 1. It has two platinum resistance temperature sensor probes s1 and s2 respectively placed in the gas flow, where the probe s1 measures the gas flow temperature tf, and the other probe s2 is placed next to the constant heat source to detect the temperature tw after the heat is taken away by the gas. When the gas flow state is stable, the probe and the surrounding medium are in an approximate thermal equilibrium state, and the system thermal balance equation at this time is in the formula: h———The heating value of the current to the thermal probe s2; q1———Convective heat transfer between the thermal probe and the fluid; q2———The heat conduction of the thermal probe to the measuring rod frame; q3———The heat radiated by the heat probe to the surroundings. Using the theory of heat transfer, combined with the occasion of thermal gas mass flowmeter work, for the actual heat exchange process, the convective heat transfer q1 is the key to the entire heat exchange process. Negligible. Then formula (1) can be simplified as based on the golden law, when heat balance is reached, the heat dissipation caused by convection is q, which can be expressed by formula (3): in the formula: l and d———The length and diameter of the thermal resistance wire;ρ, cp, v, k———Density, specific heat at constant pressure, flow velocity, and thermal conductivity of the gas stream. Equation (3) can be rewritten as, for a certain flowmeter and a certain measured medium, a and b are constants. The Joule heat generated by the thermal resistance wire per unit time is kept constant (tw-tf), r is a constant, then the current i is the parameter for calculating the mass flow rate, the square i2 of the current i is proportional to the square root of the mass flow rate, and the current i is proportional to the square root of the mass flow rate. It can be obtained from the output heating voltage u. Therefore, keeping the temperature difference constant, the mass flow rate of the gas can be obtained by measuring the voltage u.

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