A device for measuring air flow in a pipeline

Abstract

A flow measurement apparatus of pipe airflow is an apparatus for measuring a flow velocity or flow of a pipe gas-solid two-phase flow body or a single-phase high temperature flow body. A fan blade rotor arranged in the middle of a pipe is connected to a wind measurement connection pipe through a rotating shaft. The wind measurement connection pipe is connected to a pipe base flange welded on a pipe wall. The rotating shaft is connected to an upper pipe sleeve and a lower pipe sleeve installed on the wind measurement pipe base. Both ends of the rotating shaft are provided with magnets which fix positions of the rotating shaft and the wind measurement connection pipe through magnetic suspension force. The rotating shaft transmits output signals to a data processor through a rotating speed sensor for processing. The flow measurement apparatus of the pipe airflow uses the flow of a primary airpipe powder mixture to drive the fan blade rotor to rotate, and converts the rotating speed of the fan blade rotor into the wind speed of the pipe. The air output is calculated through a module processor. The piezometric pipe blocking problem in the measurement of the primary pneumatic pressure is avoided, and on-line monitoring of the wind speed or the wind quantity is realized. The apparatus service life is greatly prolonged by using a magnetic suspension technology, a sealing technology which uses high pressure cleaning air, and wear resistant materials.

Description

technical field [0001] The invention relates to the flow velocity and flow measurement of pulverized coal gas-solid two-phase fluid or the flow velocity and flow measurement technology of single-phase high-temperature fluid. Background technique [0002] In the combustion system of power plant boilers, the wind speed of the primary air duct is an important parameter for the combustion adjustment of the power plant boiler. If the primary wind speed is too high, it will easily cause unstable combustion of the boiler and even extinguish the fire; if the primary wind speed is too small, it will cause powder accumulation or blockage in the primary air duct , and even once the air duct was burned. For a long time, technicians have made too much effort to measure the velocity of the air-powder mixture in the primary air duct. Therefore, a variety of on-line monitoring technologies for the air-powder mixture in the primary air duct have been applied in the actual production of power...

AI Technical Summary

Problems solved by technology

However, due to the change of airflow temperature, the coefficient used to calculate the airflow velocity is very different, making it difficult to accurately take into account the flow velocity in different temperature ranges. Therefore, in the case of small temperature changes, the airflow velocity measured by the electrostatic charge method It can only reflect the change trend of the fluid velocity, but cannot truly reflect the actual flow velocity and flow rate of the fluid

Images