Thermal type perforated plate gas flowmeter applied to non-uniform flow field

A technology of gas flowmeter and porous plate, which is applied in the direction of volume/mass flow generated by mechanical effects, liquid/fluid solid measurement, fluid flow detection by measuring pressure difference, etc., and can solve problems such as low flow rate, condensation, crystallization, etc.

Inactive Publication Date: 2018-05-04
南京博沃科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In order to solve the problems existing in the existing technology, overcome the difficulties of low flow rate and uneven flow field in the measurement of gas flow in large-diameter pipelines, as well as th...

Method used

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  • Thermal type perforated plate gas flowmeter applied to non-uniform flow field
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  • Thermal type perforated plate gas flowmeter applied to non-uniform flow field

Examples

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Effect test

Embodiment 1

[0039] The 600MW coal-fired unit adopts the SCR denitrification process, uses liquid ammonia as the reducing agent, and uses normal temperature air to dilute the mixed gas to less than 5%. In order to overcome the flow resistance, the transmission pipeline system is equipped with a dilution fan. The denitrification system needs to be reconstructed by partitioned ammonia injection, and it is necessary to measure the distribution of the mixed gas flow in each partition. However, due to the limited increase in the pressure head of the dilution fan and the limited renovation space, the flow velocity on the flow measurement section of the main pipe (diameter DN250) in each partition is low and the distribution is uneven. Uniform, difficult to measure.

[0040] use as Figure 1-2The shown thermal porous plate gas flowmeter applied to the uneven flow field includes an outer casing, an inner casing, a first porous plate, a temperature sensor, a speed sensor and a signal transmitter; t...

Embodiment 2

[0043] The 1000MW coal-fired unit adopts the SCR denitrification process, uses urea as the reducing agent, adopts the pyrolysis method to produce ammonia, and uses the hot primary air at about 300°C as the dilution air to dilute the ammonia concentration to below 5%. The denitrification system needs to be reconstructed by partitioned ammonia injection, and it is necessary to measure the distribution of the mixed gas flow in each partition, but the renovation space is limited, and the flow velocity distribution on the flow measurement section of the main pipe (diameter DN250) of each partition is not uniform, and there are condensation and crystallization of urea when it is cold. The problem. According to the characteristics of urea, urea is unstable above 160°C and decomposes, but the decomposed NH 3 with CO 2 Below 200°C, urea will be synthesized and deposited in the pipeline, so all differential pressure flowmeters are not suitable.

[0044] The process of ammonia producti...

Embodiment 3

[0047] The 300MW coal-fired unit adopts the SCR denitrification process, uses urea as the reducing agent, adopts the hydrolysis method to produce ammonia, and uses the hot primary air at about 300°C as the dilution air to dilute the ammonia concentration to below 5%. The denitrification system needs to measure the distribution of the mixed gas flow in each zone when the denitrification system is upgraded. However, the renovation space is limited, and the flow velocity distribution on the flow measurement section of the main pipe of each zone is uneven. At the same time, there are also problems of condensation and crystallization of cold urea. According to the characteristics of urea, urea is unstable above 160°C and decomposes, but the decomposed NH 3 with CO 2 Below 200°C, urea will be synthesized and deposited in the pipeline, so all differential pressure flowmeters are not suitable.

[0048] The process flow of ammonia production by urea hydrolysis method is as follows: se...

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Abstract

The invention discloses a thermal type perforated plate gas flowmeter applied to a non-uniform flow field. The thermal type perforated plate gas flowmeter applied to the non-uniform flow field comprises an outer sleeve, an inner sleeve, a first perforated plate, a temperature sensor, a speed sensor and a signal transformer; the first perforated plate is arranged inside the outer sleeve, and the plane where the first perforated plate is located is perpendicular to the axial direction of the outer sleeve; the inner sleeve is arranged inside the outer sleeve, one end of the inner sleeve is an upper port, the other end of the inner sleeve is a lower port, and the lower port of the inner sleeve penetrates through the first perforated plate; the temperature sensor and the speed sensor are installed inside the inner sleeve, and the temperature sensor and the speed sensor are connected with the signal transformer. The thermal type perforated plate gas flowmeter is particularly applicable to gas flow measurement of the non-uniform flow field with pipelines of large diameters being DN100 or above, the thermal type perforated plate gas flowmeter has the remarkable advantages of being high insensitivity and precision, wide in range ratio, small in throttling loss and the like, and meanwhile the thermal type perforated plate gas flowmeter can be applicable to the occasions that some components in gas measurement are condensed, crystallized and the like when cooled.

Description

technical field [0001] The invention relates to a thermal porous plate gas flowmeter applied to an uneven flow field, belonging to the technical field of gas flow measurement. Background technique [0002] Gas flow is an important parameter in industrial production process and scientific experiment measurement, and flow meter is a tool for measuring and testing gas flow. Gas flow measurement is an important part of energy measurement, which plays an important role in ensuring product quality, improving production efficiency, saving energy, and promoting technological development. [0003] Gas flow measurement is very dependent on application conditions, and the influencing factors include gas types, flow conditions, and field application conditions. In the laboratory, the flowmeter can obtain extremely high accuracy, but once the gas conditions or environmental conditions have changed greatly in the field application, not only the accuracy cannot be guaranteed, but even nor...

Claims

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Application Information

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IPC IPC(8): G01F1/34G01F15/00
CPCG01F1/34G01F15/00
Inventor 韦红旗石伟伟
Owner 南京博沃科技发展有限公司
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