Device and method for dehydrating and dehumidifying wellhead natural gas

Abstract

The invention provides a device and a method for dehydrating and dehumidifying wellhead natural gas, and belongs to the technical field of natural gas. The device comprises a gas-liquid preseparator,a heat exchanger, a first-stage gas-liquid separator, a throttling tube, a final-stage gas-liquid separator, and control valves on all pipeline. Free water in water-containing high-pressure wellhead natural gas is removed in the gas-liquid preseparator to obtain a preliminarily dehumidified wet natural gas, then the preliminarily dehumidified wet natural gas successively enters the heat exchangerand the first-stage gas-liquid separator to achieve cooling, separation and dehumidification, the dehumidified gas is depressurized and cooled by the throttling tube, and then enters the final-stage gas-liquid separator, and a gas obtained after the separation is natural gas that meets the moisture requirement, wherein all or a part of the natural gas is recovered by the heat exchanger, and then is imported to an outside natural gas transporting pipeline network. The device has the advantages of no moving parts, simple structure and high reliability, and realizes organic combination of coolingcondensation and water removal separation only by using the self energy conversion of the natural gas without outside energy input in the running process in order to achieve the purpose of dehydrating and dehumidifying the wellhead natural gas.

Description

technical field [0001] The invention relates to the technical field of natural gas, in particular to a wellhead natural gas dehydration and dehumidification device and method. Background technique [0002] Natural gas is a high-quality green and clean energy. Along with the exploitation of crude oil, the natural gas well gas resources extracted on site not only have high pressure, but also carry a large amount of free water and saturated water vapor. For the natural gas transported abroad, it is necessary not only to ensure the safety of the delivery pressure, but also to prevent the condensation of water vapor, the formation of hydrates, or the freezing of natural gas due to fluctuations in the ambient temperature during the process of natural gas transport, which will cause pipelines and valves in downstream processes to clogged. For sour natural gas, if there is a large amount of wet steam inside, acid gases such as carbon dioxide and hydrogen sulfide will dissolve with ...

AI Technical Summary

Problems solved by technology

The problem with this method is that the regeneration process requires a large amount of external energy input, and the higher regeneration temperature may cause the solvent itself to decompose, resulting in the failure of the absorption solvent and affecting the dehydration effect.

At present, this process is widely used in China, but it requires an external cold source, and is equipped with a hydrate inhibitor and an inhibitor regeneration system, and the process is relatively complicated.

Images