Heavy hydrocarbon removing process and device of natural gas

Abstract

The invention relates to a heavy hydrocarbon removing process of natural gas, i.e. a heavy hydrocarbon removing process by adopting the combination of an adsorbent and low-temperature separation. According to the heavy hydrocarbon removing process disclosed by the invention, most heavy hydrocarbons in the natural gas are removed by an adsorbent bed layer of a heavy hydrocarbon removing tower, then the natural gas enters a cold box for further low-temperature separation to remove residual heavy hydrocarbons, and C6 and C6<+> heavy hydrocarbon components in the natural gas after treating are removed until the soluble degree of LNG (Liquefied Natural Gas); regeneration gas used for regeneration of the heavy hydrocarbon removing tower is taken from process gas, and is regenerated by sequentially pre-cooling, partial heavy hydrocarbon separation and low-temperature heavy hydrocarbon separation in the cold box, so that excessive heavy hydrocarbons are not carried when the regeneration gas is returned to the process gas, the load of the heavy hydrocarbon removing tower and the device investment cost are lowered, and the source and destination problems of the regeneration gas are solved. In addition, with the adoption of the heavy hydrocarbon removing process, the purification effect is good, and an operation index of each part is clearer and is easily controlled. The invention also relates to a device used by the process.

Description

technical field [0001] The invention belongs to the front-end purification treatment technology of low-temperature liquefaction of natural gas, and in particular relates to a process and device for removing heavy hydrocarbons from natural gas. Background technique [0002] Under the pressure of environmental protection and energy costs, the proportion of natural gas as a primary energy source in various fields of society is gradually increasing, and its market demand is also increasing rapidly. The traditional pipeline transportation supply method is still the mainstream, but due to the limitation of raw material conditions and user distribution, a considerable part of resources cannot be transported by pipelines for long distances. It is necessary to choose the liquefaction method to convert methane into liquid and then use flexible transportation methods to send it to to the user terminal. The volume of liquefied natural gas (LNG) is only 1 / 625 of the volume of the same a...

AI Technical Summary

Problems solved by technology

The traditional pipeline transportation supply method is still the mainstream, but due to the limitation of raw material conditions and user distribution, a considerable part of the resources cannot be transported by pipelines for long distances. It is necessary to choose the liquefaction method to convert methane into liquid and then use flexible transportation methods to send it to to user terminal

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