Dense-phase pulverized coal mass flowmeter

Abstract

The invention relates to a mass flowmeter, and particularly relates to a dense-phase pulverized coal mass flowmeter. The dense-phase pulverized coal mass flowmeter is characterized by comprising a conduit and two charge induction sensors, wherein the front part and the back part of the conduit are connected to a to-be-measured pulverized coal pipeline, the conduit wall of the conduit is divided into an inner conduit wall and an outer conduit wall, a gap is left between the inner conduit wall and the outer conduit wall, the charge induction sensors are in shapes of circular rings, and the two circular ring-shaped charge induction sensors are arranged in different front and back positions of the gap between the inner conduit wall and the outer conduit wall of the conduit. Gas-solid two-phase flows of pulverized coal flow through the charge induction sensors, the total amount of the pulverized coal, i.e. the mass flow of the pulverized coal, is measured through mediums and induction charges of the charge induction sensors, then the accurate medium velocity is measured through charge induction signals, and the stable pulverized coal concentration is obtained by calculating the instantaneous total amount of the pulverized coal and the instantaneous flow velocity of pulverized coal media, which are measured at the same time and in the same measuring point.

Description

technical field [0001] The invention relates to a mass flowmeter, in particular to a dense phase pulverized coal mass flowmeter. Background technique [0002] Entrained bed pulverized coal pressurized gasification technology is one of the most advanced coal gasification technologies in the world. In order to achieve the best gasification efficiency and avoid problems such as safety and process index deterioration caused by oxygen-coal ratio imbalance The oxygen-to-coal ratio in the gasification process is effectively controlled by accurately measuring the pulverized coal mass flow rate under the condition of pressurized dense phase conveying on-line. [0003] At present, capacitive pulverized coal mass flowmeters are mostly used to measure pulverized coal mass flow. Its working principle is to install the capacitor plate outside the flow pipe. When the gas-solid phase ratio in the pipe changes, the dielectric constant will also change accordingly. This causes the capacitanc...

AI Technical Summary

Problems solved by technology

However, the working conditions of pulverized coal transportation in the entrained entrained bed pulverized coal pressurized gasification technology are far from the working conditions in the primary air duct of thermal power plants. , while the concentration of pulverized coal in the pulverized coal gasification furnace pulverized coal pipeline is as high as 300~400kg / m3, and the pressure is about 4600kpa. In addition, the structure of the plug-in sensor of the device is not suitable for the measurement of the mass flow rate of dense phase pulverized coal

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