Compact type natural gas pretreatment and purification method and device suitable for offshore platform

Abstract

The invention relates to a compact type natural gas pretreatment and purification method and device suitable for an offshore platform. The compact type natural gas pretreatment and purification method and device are suitable for pretreatment and purification of natural gas exploited from the offshore platform as well as removal of heavy hydrocarbon, soluble salt ions and most moisture from the natural gas. The exploited natural gas enters the device from a gas phase inlet, sequentially passes through a spray washing unit, a uniform gas and liquid distributing unit, a natural gas and washing water mixing and mass transferring unit, a spiral forming unit and a natural gas and washing water separation unit and flows out from a gas phase outlet. A removed liquid enters a liquid storage unit. Fresh water is injected to the spray washing unit from the liquid storage unit through a pipeline circulating pump and sprayed out. Natural gas treated with the method does not contain soluble salt ions and most moisture in original wet natural gas. The compact type pretreatment method performs online treatment on natural gas on the offshore platform with a narrow space and can quickly remove impurities and liquids.

Description

Technical field [0001] The invention relates to a compact natural gas pretreatment and purification method and device suitable for offshore platforms, which are suitable for the pretreatment and purification of natural gas produced on offshore platforms, and remove heavy hydrocarbons, soluble salt ions and most of the water in the natural gas. Background technique [0002] Natural gas is a world-recognized high-quality and high-efficiency energy source. It has a series of advantages such as clean, environmentally friendly, large reserves, and its high calorific value, easy to use, complete combustion, clean, and cheap. It is also a precious chemical raw material and can produce nearly a thousand chemicals. product. Promoting the use of natural gas can not only improve the quality of life of urban residents, but also promote the development of local industry and commerce, which is of great significance to the promotion of ecological environment construction and urban transformatio...

AI Technical Summary

Problems solved by technology

[0005] The patent "A Natural Gas Dehydration Equipment" (CN205893185U) introduces a utility model that uses the principle of a cyclone to remove the liquid in natural gas; the patent "Natural Gas Dehydration Device" (CN105087096A) introduces a A device with a complex structure that uses water filtration membranes to remove liquids from natural gas

The above patent, "A Natural Gas Dehydration Equipment" uses the principle of a cyclone to separate, the dehydration efficiency is limited, the floor area is large, and the dynamic equipment is set in the dehydration element, and the operation and maintenance of the device require a certain cost; "Natural Gas Dehydration The device has a complex structure, a large footprint, and high manufacturing costs, so it is obviously not suitable for offshore platforms with small spaces

Most importantly, both of the above two patents remove the liquid in the existing natural gas, and in order to remove the soluble salt entrained in the natural gas, there is still a large amount of soluble salt in the liquid that has not been removed, and this part of the liquid is attached to the On the impeller of the compressor, the precipitation of soluble salts has a huge impact on the long-term stable operation of the compressor

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