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Gas flow measuring device and application thereof

A technology of gas flow and measurement devices, which is applied in the direction of measurement devices, liquid/fluid solid measurement, liquid distribution, transportation or transfer devices, etc., and can solve the operation and volume flow of gas flow measurement devices that have no pressure data and are difficult to calibrate in sections. Inaccurate and other issues, achieve good compatibility and scalability, and reduce the effect of difficult problems that require very high manufacturing consistency

Pending Publication Date: 2022-01-07
苏州三米格环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There is a big problem in the existing technology: when measuring the gas volume, only the flow rate of the gas passing through the probe is measured, and there is no pressure data, so the gas flow measurement device is limited to normal pressure or -10KPa For the measurement within the range of ~+10KPa, for the pipeline installed with the gas flow measuring device, when the pressure is relatively high, the gas flow measuring device of the prior art will measure inaccurately
[0004] In the field of on-line monitoring of oil and gas recovery in gas stations, according to relevant requirements, volume flow is required to be measured. According to the gas state equation: PV=nRT; the pressure of the location where the gas flow measurement device is installed is different, and the volume of the gas is also different. If there is no pressure compensation , The gas flow measuring device can only measure the volume of gas at normal pressure. For the volume outside the range of -10KPa ~ 10KPa when the pressure changes, the vortex gas flow measuring device of the prior art can not measure accurately
[0005] Another problem with the gas flow measurement device of the existing technology is that it is difficult to carry out segmental calibration of the gas flow measurement device. The gas flow measurement device itself does not have an MCU, and its circuit board only has signal amplification, filtering, and integration into PWM signals. Therefore, if the gas flow measurement device needs to be calibrated in sections, it can only be performed on the back-end signal processing of the gas flow measurement device, which limits the one-to-one correspondence between the gas flow measurement device and the signal processing and metering equipment. Otherwise, the flow characteristics of each gas flow measurement device are different, and the volume flow obtained by using the same flow characteristic curve to measure will be inaccurate

Method used

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  • Gas flow measuring device and application thereof
  • Gas flow measuring device and application thereof
  • Gas flow measuring device and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] Embodiment 1 Vortex street gas flow measurement device (the pressure probe is upstream of the vortex street vibration probe)

[0086] Such as figure 1 As shown, set a spoiler column on the pipeline through which the gas passes (such as figure 2 Shown in serial number 5), a vortex vibration probe 3 is arranged downstream of the spoiler column 5, and a small hole is opened on the upstream air flow channel 9 of the spoiler column 5 for measuring the medium pressure of the pipeline, above the small hole An air pressure measurement unit 4 is provided, and the air pressure measurement unit 4 is arranged upstream of the vortex-type gas flow measurement unit, and a circuit of a power supply and an output module 6 is arranged in the airtight cavity formed by the housings 1 and 2 of the gas flow measurement device board and a signal processing module 7 on the circuit board.

[0087] The gas flow measurement unit converts the gas volume flow in the air flow channel into a first...

Embodiment 2

[0125] Embodiment 2 Vortex street gas flow measuring device (the pressure probe is upstream of the vortex street vibration probe)

[0126] In the vortex street gas flow measurement device proposed by the present invention, the pressure probe can also be arranged downstream of the vortex vibration probe, such as Figure 8 Shown, others are identical with embodiment 1.

[0127] Such as Figure 8 As shown, set a spoiler column on the pipeline through which the gas passes (such as figure 2 Shown in the serial number 5), a vortex vibration probe 3 is arranged downstream of the spoiler column 5, and a small hole is opened on the air flow channel 9 downstream of the vortex vibration probe 3 for measuring the medium pressure of the pipeline. An air pressure measurement unit 4 is arranged above the small hole, and the air pressure measurement unit 4 is arranged downstream of the vortex-type gas flow measurement unit, and a power supply and an output module are arranged in the airtig...

Embodiment 3

[0140] Embodiment 3 Roots gas flow measuring device

[0141] Such as Figure 11 As shown, a pair of waist wheels (waist wheel A, waist wheel B) are arranged in the waist-shaped cavity 23 formed by the base 22, and when the gas flows through, the waist wheels will rotate. Every time the waist wheel rotates one week, the volume of the gas flowing through is roughly fixed (under the condition of constant pressure). Such as Figure 14 As shown, two magnets 13 are arranged on the toothed disc 10 coaxial with the waist wheel. When the gas flows through, the rotation of the waist wheel drives the toothed plate to rotate, and the magnet on the toothed plate will trigger the magnetic switch to be on or off periodically, so as to generate the first gas volume flow signal. Such as Figure 16 As shown, the PWM signal is obtained.

[0142] According to the gas state equation: PV=nRT, there is no pressure compensation in the prior art. If it is tested under normal pressure, there is no...

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Abstract

The invention discloses a gas flow measuring device comprising a shell, a gas flow measuring unit, a gas pressure measuring unit, a signal processing unit and a power supply and output module; the shell is formed with a gas flow channel and a signal processing unit containing cavity separated from the gas flow channel; at least part of the gas flow measuring unit is arranged in the gas flow channel, and the gas flow measuring unit converts the gas volume flow in the gas flow channel into a first gas volume flow signal; the gas pressure measuring unit is in gas communication with the gas flow channel and converts the gas pressure in the gas flow channel into a gas pressure signal; the signal processing unit is accommodated in the signal processing unit accommodating cavity and comprises a calculation unit, namely an MCU; the calculation unit processes the first gas volume flow signal and the gas pressure signal into a second gas volume flow signal according to a preset calculation relation; and the power supply and output module supplies power to the gas pressure measuring unit and the gas flow measuring unit and outputs the second gas volume flow signal.

Description

technical field [0001] The invention belongs to the technical field of flow measurement, and relates to a gas flow measurement device with pressure compensation and a flow measurement method, in particular to a gas flow measurement device and an application thereof for an oil gas recovery online monitoring system of a gas station. Background technique [0002] The small-caliber vortex gas flow measurement device or Roots gas flow measurement device (or Roots sensor) used in the oil gas recovery online monitoring system of the gas station, the working principle of the vortex gas flow measurement device is: when the gas flows through the pipeline installed When the channel is spoiled, the oil will generate Karman vortex, and a pressure-sensing probe is installed downstream, and the gas flows through. The frequency of the gas vortex generated by the Karman vortex principle is positively correlated with the flow velocity of the gas. By measuring the gas pressure The flow rate of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F15/04B67D7/04
CPCG01F15/04B67D7/048
Inventor 周学俊李华平
Owner 苏州三米格环保科技有限公司