Thermal mass flowmeter scale applications in nuclear power plants

Abstract: the application of thermal mass flowmeter scale in nuclear power plant information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Traffic is one of the important process parameters during the operation of nuclear power plants, commonly used in flow measurement instrument with orifice flowmeter, ultrasonic flowmeter, electromagnetic flowmeter as well as the thermal mass flowmeter and so on. Thermal mass flowmeter is more used in industrial gas flow. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a thermal mass flowmeter scale in nuclear power plant the application of article details. Traffic is one of the important process parameters during the operation of nuclear power plants, commonly used in flow measurement instrument with orifice flowmeter, ultrasonic flowmeter, electromagnetic flowmeter as well as the thermal mass flowmeter and so on. Thermal mass flowmeter is more used in industrial gas flow measurement, is widely used in ventilation system in nuclear power plant flow measurement occasions. Shaft seal used in the type of the main pump of the nuclear power plant, the main pump seal leakage flow is a typical 3 small flow condition. Orifice flowmeter and ultrasonic flowmeter are usually not applicable or not obtain good measurement effect. Since the advent of thermal mass flowmeter, has succeeded the application in nuclear power plant ventilation system, in respect of tiny liquid flow measurement, the thermal mass flowmeter is also has certain applicability. 1 the principle of thermal mass flowmeter (1) thermal mass flowmeter is using the heat conduction principle, namely through the fluid flow and heat source, the heat exchange between the measured medium flow meter, can be divided into two main categories: the use of fluid transfer heat flow change measuring tube wall temperature distribution ( The heat transfer distribution) Effect of heat distributed flowmeter, also known as quantity thermal mass flowmeter; Using the heat dissipation effect ( Based on the law of the Kim) Intrusive mass flowmeter, also known as the thermal mass flowmeter or plug in mass flowmeter. Hot working principle of the distributed mass flowmeter is outside the measuring tube wall or downstream revolves around two sets of heating coil/detection, two sets of coil heat at a constant current, when the fluid static ( No flow through) Upstream or downstream, two sets of coil center temperature distribution in the symmetrical balance state, two groups of testing the resistance of the coil is equal; When the fluid flow, fluid pass upstream wall heat away to the downstream wall, destroyed the original equilibrium state and coil resistance difference, detect the difference of fluid mass flow rate obtained: ( 1) A&mdash type; — — Heat transfer coefficient; cp - — — The specific heat at constant pressure of measured medium; K— — — Constant. Heat dissipation effect ( Based on the law of the Kim) Working principle of intrusive mass flowmeter is two temperature sensor ( General for the platinum thermal resistance) Respectively in the fluid of the pipe, by one of the platinum resistance measured the temperature of the fluid itself T, another platinum resistance by a certain power of electric heating, TV is higher than the temperature T and its high temperature zui, when the fluid static with the increase of fluid flow in pipes, fluid flow away more heat reduce TV, by calculating flow temperature difference value. Based on the law of the Kim heater heat loss rate as follows: ( 2) Cv&mdash type; — — Fluid of the constant volume heat capacity; d— — — Hot wire diameter; H / L - — — Unit length heat loss rate; V— — — The flow rate of the fluid; ρ — — — The density of fluid; λ — — — Thermal conductivity of the fluid. Intrusive mass flowmeter based on platinum thermal resistance heating mode, is divided into constant power, constant temperature differential and constant ratio. Constant power type is in the heating circuit with a constant power of platinum resistance heating, the power of fluid medium in the static, heated platinum resistance and has not been heated platinum resistance temperature difference between zui, along with the flow of the fluid medium, heated platinum resistance temperature is reduced, on the temperature difference between two platinum resistance decrease. The thermal mass flowmeter with constant power is made by measuring the change of the temperature difference for the change of fluid flow. Constant temperature differential is a platinum resistance heating, make its higher than not heated platinum resistance a constant temperature. With the flow of the fluid medium, the heated platinum resistance due to the cooling temperature is reduced, through feedback circuit to increase the current of heater processor ( Can also be a voltage) To maintain its temperature difference is a constant value, and then by detecting changes in the current ( Or voltage) Change in the flow to obtain the value. Constant rate is on the basis of the principle of constant temperature, by adjusting the applied heat the heating resistor on the heating current in place to ensure that the heated platinum resistance value and not heated platinum resistance value in a constant ratio.

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