Secondary standard device and method for natural gas large flow real flow calibrating

A secondary standard, high-flow technology, used in measuring devices, testing/calibration devices, liquid/fluid solids measurement, etc. The effect of improving the measurement uncertainty of the system

Pending Publication Date: 2018-06-22
XIAN CHANGQING TECH ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] In order to overcome the existing problems of low verification accuracy and high cost and investment, the present invention provides a secondary standard device and method for large-flow real-flow verification of natural gas. The present invention optimiz

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  • Secondary standard device and method for natural gas large flow real flow calibrating

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Embodiment 1

[0040]In order to overcome the problems of low accuracy and high cost investment in the existing test, the present invention provides such as figure 1 Shown is a secondary standard device and method for large-flow real-flow verification of natural gas. The present invention optimizes the group skid form of the secondary standard device, reduces the pipe capacity of the upstream manifold during small-flow verification, and improves the verification accuracy; The number of cut-off valves reduces investment and maintenance to a certain extent.

[0041] A secondary standard device for large-flow real-flow verification of natural gas, comprising an upstream header 1, a downstream header 2, and fifteen critical flow nozzles 3 arranged in parallel; the lower end of each critical flow nozzle 3 is connected to the downstream header 2, The upper end of each critical flow nozzle 3 communicates with the upstream header 1; each critical flow nozzle 3 is provided with a rectifier 4 upstream...

Embodiment 2

[0048] Based on the above embodiments, in this embodiment, the upstream header 1 includes a first upstream header 101, a second upstream header 102 and a third upstream header 103, and the first upstream header 1 is connected to the second upstream manifold 2 through the first manifold forced sealing ball valve 107, and the second upstream manifold 2 is connected to the third upstream manifold 3 through the second manifold forced sealing ball valve 108; the first upstream The header 101 is provided with two inlets, the first inlet 104 and the second inlet 105, the pipeline of the first inlet 104 is DN250, and the pipeline of the second inlet 105 is DN100; the second upstream header 102 is provided with a third inlet 106 , the third inlet 106 pipeline is DN150.

[0049] The first upstream header 101 is connected with four critical flow nozzles 3, the four critical flow nozzles 3 are DN50 nozzles, and the flow rates are respectively 10 m 3 / h, 20m 3 / h, 40m 3 / h and 80m 3 / h...

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Abstract

The invention provides a secondary standard device and method for natural gas large flow real flow calibrating. The device comprises an upstream header, a downstream header, and fifteen critical flownozzles which are parallel arranged; lower ends of the critical flow nozzles are communicated with the downstream header, and upper ends of the critical flow nozzles are communicated with the upstreamheader; rectifiers are arranged at the upstream of the critical flow nozzles, and telescopic devices are arranged at the downstream of the critical flow nozzles. During the designing process of the Yulin calibrating post of the National Oil and Natural Gas Large Flow Metering Station, calibrating of a working-level standard flow meter and other high-precision flow meters is achieved by adopting the device. A tube capacity of 1.3m<3> is reduced during small flow calibration, the uncertainty of systematic measuring when calibration is performed is improved, the number of zero-leakage forced sealing ball valves is reduced, the device investment cost is reduced by approximately 500,000 dollars and the valve maintenance cost is reduced by 200,000 dollars per year.

Description

technical field [0001] The invention belongs to the field of natural gas metering, in particular to a secondary standard device and method for large-flow real-flow verification of natural gas. Background technique [0002] 1. The situation of domestic actual flow test quantitative value transfer system [0003] At present, large and medium-caliber (DN200 and above) natural gas metering flowmeters such as ultrasonic flowmeters, turbine flowmeters, etc. (inspected flowmeters) for domestic trade transfer use the standard meter method (working standard) for real-flow compulsory verification and calibration. The system uncertainty of the working standard can reach 0.33%, and the standard meter generally adopts a 0.25-grade high-precision gas turbine flowmeter. For the actual flow mandatory verification and calibration of the standard meter, because the critical flow nozzle has stable critical flow characteristics and high outflow coefficient uncertainty, the domestic natural gas...

Claims

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Application Information

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IPC IPC(8): G01F25/00
CPCG01F25/15
Inventor 任晓峰姚欣伟王登海孙志鹏吴宝祥王东白岩张昆白东丰
Owner XIAN CHANGQING TECH ENG
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