Method for removing hydrogen sulfide from raw gas with low hydrogen sulfide content on offshore platform

Abstract

The invention discloses a method for removing hydrogen sulfide from a low-content hydrogen sulfide raw gas of an offshore platform. The method is characterized by comprising the following steps: putting the raw gas containing hydrogen sulfide into a super-gravity machine from a side direction, wherein the content of hydrogen sulfide in the raw gas containing hydrogen sulfide is smaller than or equal to 300ppm; allowing a desulfurizing agent to enter the super-gravity machine through the center of the super-gravity machine, and spraying the desulfurizing agent on the surfaces of fillers by a liquid distributor, wherein inside the super-gravity machine, the desulfurizing agent flows from an inner ring to an outer ring of the fillers, the raw gas flows from the outer ring to the inner ring, a gas phase and a liquid phase have converse contact with each other along the radial direction in a filler layer to perform a full reaction, hydrogen sulfide is transferred to the liquid phase to be absorbed by amino in the desulfurizing agent, and then the purified raw gas is directly discharged from the super-gravity machine through an outlet. According to the process, a regeneration procedure of the desulfurizing agent is saved, the process is greatly simplified, equipment is reduced, and the floor area is saved. By utilizing the characteristic that the super-gravity machine is used for intensifying absorption and reaction, and being combined with high efficiency and selectivity of an organic amine desulfurizing agent, the method has the advantages that the equipment is simple in structure, small in floor area, easy to prize, large in operating flexibility, high in desulfurization efficiency and the like, so the method is a new technology for removing low-content hydrogen sulfide from the natural gas of the offshore platform.

Description

technical field [0001] The technology of the present invention relates to a desulfurization ultra-low emission technology, in particular to a method for removing hydrogen sulfide in low-content hydrogen sulfide feed gas on an offshore platform. technical background [0002] At present, the development of offshore oilfields has gradually entered the middle and late stages, and the concentration of primary or secondary hydrogen sulfide gas in natural gas has been increasing, causing serious corrosion of offshore platform equipment and pipelines. Especially in the submarine pipeline, it is very easy to perforate and leak, which will bring incalculable economic loss and environmental impact to the operator. Therefore, it is necessary to desulfurize the natural gas or oilfield associated gas to reduce the hydrogen sulfide content of the purified gas as much as possible. [0003] Natural gas desulfurization can be divided into dry method and wet method. Dry methods mainly include...

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Problems solved by technology

Chinese patent 200710101508.0 reports a method for supergravity desulfurization of oilfield gas and natural gas. This process has long regeneration time, low efficiency, and huge sulfur separation equipment. The process is basically similar to that reported in Chinese patent 201320055902.6 and is not suitable for installation on offshore platforms; Chinese patent 201110076120.6 reported a method for oxidation removal of hydrogen sulfide in the gas phase under a supergravity field. This method is better suitable for various raw materials with hydrogen sulfide content ≥ 1300ppm; this process is used in natural gas and crude oil associated gas hydrogen sulfide When removing, the removal efficiency reaches 98-99%, and the outlet concentration is 1-3ppm

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