Gas flow measurement

The measurement of gas flow has a large number of gas meters in each link of gas production, transportation and distribution, some are used for general monitoring, and some are used for trade settlement, among which the measurement system for trade settlement, the national standard 68 17167 stipulates its accuracy degree requirements. (!) The characteristics of gas flow measurement are low hydrostatic pressure, low flow velocity, and small allowable pressure loss. Generally, it is not allowed to increase the flow velocity by reducing the pipe diameter. The fluid has high humidity, and some measurement objects also carry a small amount of water, which flows in layers at the bottom of the pipe. . Some measurement objects have high hydrogen content and low fluid density, and the signal is weak when measured with a vortex flowmeter. The gas produced by the coal gasifier, coke oven, etc. generally contains viscous substances such as tar, and some also contain a certain amount of dust. When the measured point is located at the outlet of the compressor, there is a certain flow pulsation. I fluid is a flammable and explosive medium, and the instrument has explosion-proof requirements. ^Available in various diameters from small to large. 11. There is a huge difference between the minimum flow and the maximum flow. 1. The system used for trade settlement requires high measurement accuracy; as a general monitoring and process control system, the accuracy requirement is lower. The main content of the national standard was issued by the State Bureau of Quality and Technical Supervision in 2000. The first part of 'Measurement of Flow of Main Pipelines of Artificial Gas in Towns' adopts the method of standard orifice throttling device, and stipulates the relevant technical issues in the measurement of gas flow, among which: ① Requirements for fluid: 'It should be uniform and single-phase (Or can be considered as a single-phase) fluid'. 2. coal gas is all washed through in the purification process, so general moisture content is all in saturated state, relative humidity 1100^. ③The accuracy of the measurement system used for trade settlement should generally be better than 2.5 grades. The basic error limit is expressed as a percentage of the indicated value. ④ gas flow is defined as the dry part of the wet gas. ⑤ The measurement result is expressed in volume flow rate and converted to the standard state. The definition of standard state is except generally getting 101.3251 ^ 3, 20 β, also takes into account the tradition of gas industry, also can get other temperature and pressure and humidity that supply and demand both sides negotiates. ⑥ The throttling device adopts the form of multi-pipe parallel connection. ⑦ In the case of flow pulsation, the following measures are proposed for measuring the average flow. Use attenuation measures on the pipeline, install filters (composed of containers and pipe resistance, and the instrument detection parts should be kept away from the pulsation source as far as possible. Use as large as possible; The installation is firm. The resistance of the two differential pressure induction pipes is symmetrical.

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