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Non-uniform flow field gas flow measurement method and system

A technology of gas flow and non-uniform flow, which is applied in the direction of detecting fluid flow by measuring pressure difference, volume/mass flow generated by mechanical effects, etc., which can solve the problems of not being able to represent the average flow velocity of the measurement section, and improve accuracy and stability , reduce workload and reduce maintenance costs

Pending Publication Date: 2021-11-05
ZHEJIANG XINGHE INTELLIGENT DEV TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The flow coefficient K of the Pitot tube is relatively stable, but a single Pitot tube can only measure the flow velocity at a certain point, and the flow velocity at this point cannot represent the average flow velocity of the entire measurement section. If this is used to calculate the gas flow rate of the entire section, there will be a large deviation

Method used

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  • Non-uniform flow field gas flow measurement method and system
  • Non-uniform flow field gas flow measurement method and system
  • Non-uniform flow field gas flow measurement method and system

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Embodiment 1

[0045] Such as Figure 1-4 As shown, a gas flow measurement method in a non-uniform flow field, N Pitot tubes are arranged on the measurement section according to the grid method, and the flow velocity values ​​measured by the N Pitot tubes are obtained in turn, and the rolling average value of the continuous N flow velocity values ​​is As the average flow velocity of the measurement section, the average flow velocity is multiplied by the cross-sectional area of ​​the measurement section to obtain the gas flow rate of the section, where N≥4.

[0046] Adopting the above method significantly improves the accuracy of the gas flow measurement in the non-uniform flow field, the concept is novel, the scheme is simple, the effect is remarkable, and it is easy to popularize.

Embodiment 2

[0048] On the basis of embodiment 1, the following improvements have been further made: the Pitot tube is blown back one by one by compressed air to prevent the Pitot tube from being blocked. flow rate value.

Embodiment 3

[0050] On the basis of embodiment 2, the following improvements have been further made: as Figure 4 As shown, in order to reduce the workload of the on-site calibration test, the above N pitot tubes are connected to the same differential pressure transmitter, and the total pressure joints of each pitot tube are respectively connected to the positive pressure of the differential pressure transmitter through the first pressure guiding pipe Each first pressure introduction tube is equipped with a total pressure on-off valve; the static pressure joint of each pitot tube is respectively connected to the negative pressure end of the differential pressure transmitter through the second pressure introduction tube, each second pressure introduction tube There are static pressure on-off valves. In this way, as long as the differential pressure transmitter is calibrated, the accuracy of flow measurement can be judged.

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Abstract

The invention discloses a non-uniform flow field gas flow measurement method and system, and the method comprises the steps: arranging N pitot tubes on a measurement cross section according to a grid method, obtaining the flow velocity values measured by the N pitot tubes, enabling the average value of the flow velocity values measured by the N pitot tubes to be the average flow velocity of the measurement cross section, and multiplying the average flow velocity by the sectional area of the measured section to obtain the gas flow of the section, wherein N is larger than or equal to 4. According to the non-uniform flow field gas flow measurement method, the N pitot tubes are arranged on the measurement section, the rolling average value of the flow velocity values measured by the N pitot tubes is obtained, continuous output of the non-uniform flow field gas flow is achieved, and the accuracy of non-uniform flow field gas flow measurement is remarkably improved; and furthermore, the N pitot tubes are connected with the same differential pressure transmitter, so that the workload of a field calibration test is reduced, and the cost is reduced.

Description

technical field [0001] The invention relates to a gas flow measurement method and system in a non-uniform flow field, belonging to the field of gas flow monitoring. Background technique [0002] In the production of modern enterprises, a large amount of wind needs to be fed into the boiler every hour, and a large amount of flue gas is produced at the same time. With the deepening of my country's economic system reform and the subdivision of economic accounting units, it has become a development trend to implement cost accounting and management and fully reduce energy consumption. The measurement of dusty gas flow in large pipelines is becoming more and more important. People are paying more and more attention to it. [0003] In the industrial production process, in the measurement of the four thermal parameters of temperature, pressure, flow, and liquid level, automatic control engineers generally believe that it is the most difficult to achieve the expected accuracy and rel...

Claims

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Application Information

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IPC IPC(8): G01F1/36
CPCG01F1/36
Inventor 石伟伟韦红旗于森王丘梁万库张彭
Owner ZHEJIANG XINGHE INTELLIGENT DEV TECH CO LTD