Natural gas purification system and natural gas purification method for natural gas flow primary standard device

Abstract

The invention discloses a natural gas purification system and a natural gas purification method for a natural gas flow primary standard device. The system comprises a desulfurization tank, a buffer tank, a dehydration device and a filter, wherein the desulfurization tank, the buffer tank, the dehydration device and the filter are sequentially communicated through a pipeline, the desulfurization tank is communicated with the gas source of a natural gas flow primary standard device and is used for removing sulfur in natural gas, the dehydration device is used for enabling natural gas to pass through from top to bottom so as to adsorb the moisture in the natural gas, the filter is used for removing the solid particles in the natural gas and conveying one part of the natural gas into the standard flow meter of the natural gas flow primary standard device, the natural gas purification system comprises a heater arranged between the filter and the dehydration device, and a condenser communicated with the dehydration device, the heater is used for heating the other part of the natural gas to a first preset temperature and enabling the natural gas to pass through the dehydration device frombottom to top so as to desorb the moisture adsorbed by the dehydration device, and the condenser is used for cooling the moisture generated during the desorbing of the dehydration device.

Description

technical field [0001] The invention relates to the field of gas flow detection, in particular to a natural gas purification system and method for a natural gas flow primary standard device. Background technique [0002] The gas flow standard device is a system established to determine the standard value of gas flow. Its function is to transmit the accurate and uniform gas flow value to the flow meter used for natural gas trade measurement. Its establishment is important to ensure the accuracy of natural gas trade measurement. Sex, reliability and impartiality are of great importance. [0003] The prior art provides a gas flow primary standard device, which includes: a gas source connected in sequence, a standard flow meter, and a weighing device. In application, the natural gas in the gas source flows into the weighing device through the gas flow meter. And, measure the inflation time and the mass change of the weighing device before and after inflation, and calculate the...

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Problems solved by technology

[0005] If the detected natural gas contains sulfur or moisture, it will bring many unfavorable factors to the flow measurement of natural gas. For example, when the temperature drops or the pressure increases, the saturated water in the natural gas will be precipitated in the liquid phase. The accumulation of liquid in the device will not only increase the flow pressure drop, even form a slug flow, but also accelerate the corrosion of the acid components in the natural gas to the primary standard device of the natural gas flow; liquid water will not only freeze at the freezing point, but also, even at When the temperature of natural gas is higher than the freezing point, liquid water will also form ice-snow-like solid hydrates with some gas components in natural gas, which will block the valves, pipelines and equipment of the natural gas flow primary standard device in severe cases, affecting the natural gas flow primary stage Normal operation of standard installations, increasing uncertainty of natural gas flow measurement

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