V-cone gas flowmeter | Types and selection of gas flowmeters

『V-shaped cone gas flowmeter』Related information(flow rotameter|digital flow meter|balo meter|hydraulic flow meter|volumetric meter|positive displacement meter|pitot tube flow meter|displacement meter|cfm meter|variable area flow meter|inline flow meter|differential pressure flow meter|calibrated flow meter|velocity meter|paddle wheel flow meter|oval gear flow meter|anemometer hvac|multiphase flow meter|doppler flow meter|thorpe tube flowmeter|heat flow meter)

1. It is best to use the TY-I thermal gas mass flowmeter for measuring coke oven gas and blast furnace gas. With the development of the environmental protection industry, CEMS systems have gained widespread demand. There are certain problems and difficulties in measuring flow in CEMS systems. High temperature, high impurities, low flow rate, including low negative pressure and certain corrosiveness, are obstacles that affect measurement accuracy. At present, differential pressure principle flow meters such as pitot tubes, orifice plates, and V-cones are commonly used in the CEMS industry, which have the advantage of high temperature resistance but also have many disadvantages. Differential pressure method for measuring flow is to install a sensor into the measured tube perpendicular to the flow direction of the medium, so that the corresponding dynamic pressure and static pressure are measured on the square and back sides of the sensor. The differential pressure sensor is used to measure the difference between dynamic and static pressure (potential energy is equal). Under certain conditions, dynamic pressure energy and static pressure energy can be converted into each other, but the total energy is constant. We can use formulas. Q v=C ε Α/sqr (2 Δ P/(1- β ^ 4)/ρ 1), where: C outflow coefficient; ε coefficient of expansion Α cross-sectional area of the orifice of the throttling element, M ^ 2 Δ P differential pressure output by the throttling device, Pa; β diameter ratio ρ 1 density of the measured fluid at I-I, kg/m3; Qv volumetric flow rate, m3/h, but in actual measurement, we found many problems: when the gas flow rate is below 10m/s, the throttling element Δ P generated by the pitot tube/orifice plate is very small. Even if a high-end rosemount 3051 differential pressure transmitter is used, the measurement results are not very ideal. Moreover, factors such as pipelines, sensors themselves, and installation processes can directly affect the measurement results. In addition, since the medium itself is a gas, it is easily affected by pressure and temperature to change its density. Therefore, when measuring, we need to use temperature and pressure signals to correct the density of the gas online, which we call temperature pressure compensation. In this way, we need to install another pressure transmitter and a temperature transmitter, which not only increases the cost, but also affects the accuracy of the pressure transmitter and temperature transmitter itself for flow measurement. With the emergence of thermal gas mass flow meters, the flow measurement problems of CEMS and flue gas emissions have been well solved. The application of the Guinness theorem, also known as the principle of thermal diffusion, in thermal gas mass flow meters states that the number of fluid molecules flowing through a heat source is proportional to the amount of heat lost. There are two methods to implement this principle: one is the constant power method, and the other is the constant temperature difference method. An expression can be used to specifically explain: P/△ T=A+B (Q) m, where P represents power consumption; Δ T represents the temperature difference between two sensors; Q represents quality flow rate; M represents the exponential coefficient, A and B are constants related to the physical properties of the gas. From the above formula, it can be seen that the ratio of heating power to temperature difference of the heat source can obtain the mass

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