Wet gas flow rate metering method based on a coriolis mass flowmeter and device thereof

A wet gas flow rate metering device based on a Coriolis mass flowmeter, comprising a Coriolis mass flowmeter, and further comprising a pipe, a flow rate calculation module and a combination of sensors that is mounted on the pipe, wherein:

• the pipe is for transferring the wet gas;
• the combination of sensors is for measuring a differential pressure ΔP at an inlet and an outlet in the pipe;
• the flow rate calculation module performs a multi-physical field coupling calculation, calculates pressure P corresponding to different positions X in a measuring pipe of the Coriolis mass flowmeter, and generates a function curve between the position and the pressure;
• the flow rate calculation module calculates an average pressure P in the measuring pipe of the Coriolis mass flowmeter through the function curve;
• calculates an average gas density ρg according to the average pressure P;
• then calculates a mass liquid content ηm of a mixed medium according to the mixed density ρmix, the average gas density ρg and a liquid density ρl, wherein the liquid density ρl is a constant, specifically comprising:
• using a formula:
• η
• m
• =
• ρ
• mix
• -
• ρ
• g
• ρ
• 1
• -
• ρ
• g
• *
• ρ
• 1
• ρ
• mix
• ;
• the flow rate calculation module corrects the total mass flow rate Qm according to the mass liquid content ηm, the average pressure P in the measuring pipe and the medium temperature T to obtain a total mass flow rate Qm′;
• finally, the flow rate calculation module calculates a gas mass flow rate Qg and a liquid mass flow rate Ql according to the mass liquid content ηm and the total mass flow rate Qm′.