Online gas pressure-tapping method and online gas pressure-tapping device

Abstract

The invention provides an online gas pressure-tapping method and an online gas pressure-tapping device. The method comprises the steps of (1) mounting the pressure-tapping device, (2) resetting the device, and (3) carrying out gas pressure-tapping. The device comprises a main ball valve, a pressure transmitter, a tee joint, an auxiliary ball valve and a U-shaped pipeline; one end of the main ball valve is communicated with a gas pipeline by use of a pressure-tapping pipeline, while the other end of the main ball valve is connected with a lower opening of a three-way joint by use of a pipeline; the auxiliary ball valve is connected with an upper opening of the three-way joint by use of a pipeline; one end of the U-shaped pipeline is connected with a right opening of the three-way joint, while the other end of the U-shaped pipeline is connected with the pressure transmitter. The online gas pressure-tapping method and the online gas pressure-tapping device have the advantages that the traditional mounting manner is broken through, the working efficiency is improved, necessary isolation measure is carried out, the pressure-tapping pipeline is convenient to dredge, and the safety and accuracy are greatly improved.

Description

technical field [0001] The invention relates to a pressure acquisition technology for energy flow metering (gas medium) compensation, in particular to a gas online pressure acquisition method and device. Background technique [0002] When measuring energy flow, when the temperature and pressure change, the density of the measured medium will change accordingly, resulting in measurement errors in the flowmeter. In order to reduce the error, temperature and pressure compensation can be adopted to reduce the measurement error. The essence of the so-called temperature and pressure compensation is the density correction measures taken when the temperature and pressure of the medium are inconsistent with the values ​​adopted in the design. [0003] The pressure compensation of the medium has a large proportion in the flow measurement. directly affect the accuracy of the measurement results. [0004] At present, the straight-through pressure measurement method is mainly used (se...

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Problems solved by technology

[0005] 1. The efficiency is low. Every time the zero point of the pressure measurement unit is adjusted, the signal line and the transmission unit need to be removed. It is very easy to damage the equipment and then restore the original state. The operation process is complicated and the efficiency is low. It takes about an hour

[0006] 2. It is difficult to dredge the pressure-taking pipeline, and the dirty medium will often block the pressure-taking pipeline, thereby affecting pressure measurement and flow measurement. When the pipeline needs to be dredged, all parts above the ball valve need to be disassembled and then reinstalled

[0007] 3. The failure rate of the measuring element is high. When measuring the pressure of corrosive media, this installation method does not have the necessary isolation measures, and the membrane box of the equipment is easily corroded, resulting in damage

[0008] 4. Insufficient safety, the measuring element is in direct contact with flammable and explosive media. From the perspective of intrinsic safety, this installation method needs to be improved

[0009] 5. The measured pressure data fluctuates greatly, because there is no necessary buffer part, any change in the pipeline will be reflected in the pressure measurement value

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