Blowing flow real time measuring device and method for pipeline with rectangular section

Abstract

The invention discloses a blowing flow real time measuring device and a method for a pipeline with rectangular section, and belongs to the field of process parameter detection. The real time measuring device consists of a measuring pipe section, a sensor assembly, a micro differential pressure transmitter, an I/V (Current to Voltage) converter, an A/D (Analogue to Digital) converter, a temperature transmitter, a pressure transmitter, a programmable control sampling switch and a microcomputer signal processing system. The measuring pipe section is hermetically connected with the blowing pipeline through upstream and downstream flanges. According to the invention, with the adoption of m inner cones which are completely the same in structure and size and are arranged on the cross section of the pipeline with rectangular section of the measuring pipe section, a sensor module formed by the cross section of the measuring pipe section is equally divided. A flow rate-area flow measuring scheme by a multi-point inner cone method is designed to overcome the deficiencies that the inner cone method is commonly suitable for pipelines with circular sections, and exert the advantages of the inner core method. The invention provides a solution which is high in efficiency and robustness for the blowing flow of a power generating boiler through feasible practice.

Description

technical field [0001] The invention belongs to the technical field of process parameter detection, and in particular relates to a real-time measuring device and method for air supply flow of a rectangular cross-section pipeline. technical background [0002] In a thermal power plant, in order to make the boiler operate safely under the best working conditions, the adjustment of the air-smoke system, the adjustment of the pulverization system, and the adjustment of the combustion system all require air supply flow signals with high reliability and high effectiveness. Since the primary and secondary air supply pipes of large-scale power generation boilers are rectangular pipes with an equivalent diameter greater than 2000mm, and the allowable pressure loss is small, it is not possible to use a standard that does not require separate calibration and has high measurement accuracy in projects. throttling device, but had to use the average velocity tube wind speed sensor based on...

AI Technical Summary

Problems solved by technology

Due to the large flow section and uneven distribution of flow velocity, engineering practice shows that the effectiveness of the airfoil dynamic pressure pipe method widely used to measure the air supply flow cannot be guaranteed. Therefore, the air supply flow measurement of rectangular cross-section pipes based on the dynamic pressure averaging method is adopted. Methods including airfoil dynamic tubes still have limitations

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