System and method for multi-point grid on-line flow velocity measurement

Abstract

The invention discloses a system and method for multi-point grid on-line flow velocity measurement. The system for multi-point grid on-line flow velocity measurement comprises at least one pitot tube device, a blowback device corresponding to the pitot tube device, and a data collection control device, wherein the pitot tube device is connected with the blowback device through a pipeline, the data collection control device is connected with the pitot tube device and the blowback device through lines, the pitot tube device is installed on the wall of a flue, and a sleeve is arranged in the flue and is perpendicular to the wall of the flue. According to the system and method for multi-point grid on-line flow velocity measurement, the mode of multi-point sampling is adopted on the same monitoring section of the flue, the average flue gas flow velocity, the average flue gas pressure and the average flue gas temperature of the whole section of the flue are calculated according to the value of differential pressure between a full pressure tube and a static pressure tube of each measuring point, conversion from the point flow velocity to the line flow velocity and the face flow velocity is achieved, the problem that flow velocity fields of the short flue are uneven in distribution is solved, and accuracy of flow velocity measurement is improved.

Description

technical field [0001] The invention belongs to the field of flue gas emission detection, in particular to a multi-point grid online flow velocity measurement system and method. Background technique [0002] The flue gas flow rate is an important monitoring parameter in the continuous automatic monitoring system of fixed pollution sources, and its measurement accuracy is directly related to the accounting and efficiency evaluation of the total pollutant discharge. At present, the measurement methods of flue gas flow rate include differential pressure method, ultrasonic method, heat balance method, acoustic wave method, target flow meter method, light scintillation method, infrared method, etc. Among them, pitot tube method, ultrasonic method and heat balance method in the differential pressure method The largest amount of use at home and abroad, but due to the poor working conditions after wet desulfurization in my country, most power plants have not installed or put into ope...

AI Technical Summary

Problems solved by technology

But there are the following deficiencies: 1) It can only measure the flow velocity inside the section of the flue, and cannot detect the flow velocity at each point of the section, that is, the surface flow velocity; 2) There is no back-blowing unit; time running will be blocked by high concentration of dust detection hole

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