Method for removing acidic gas from natural gas

Abstract

The invention relates to a method for efficiently utilizing a water absorption method to remove acidic gas from natural gas. A device comprises a raw natural gas feeding pipe, an expansion machine, a brake fan, a compressor set, a separating tank, an absorbing tower, an air stripping tower, a flash tank, a water pump and a dryer, wherein a feeding pipe of the expansion machine is connected with a gas discharging pipe of the flash tank; a discharging pipe of the expansion machine is connected with a feeding pipe of the separating tank behind the expansion machine; a discharging pipe of the brake fan of the expansion machine is connected with a gas-loading port of the air stripping tower; a feeding pipe of the brake fan of the expansion machine is connected with atmosphere. The invention provides the method for utilizing the water absorption method to efficiently remove the high-content acidic gas from the natural gas; the method has the advantages of convenience in material taking, recycling, water-saving property, environmental protection and zero three-waste discharge; the method is simple in flow structure, low in energy consumption and low in cost.

Description

technical field [0001] The invention relates to a related technical field of natural gas purification, in particular to a method for removing acid gas in natural gas. Background technique [0002] As we all know, natural gas is a clean energy. In recent years, the number of installations has been increasing year by year. Regardless of whether it is pipeline natural gas or vehicle natural gas or natural gas liquefaction, the carbon dioxide (CO2) in the raw natural gas must be 2 ) and hydrogen sulfide (H 2 S) Removal, they are also called "acid" substances, which can exacerbate corrosion in gas pipelines, in addition to the relevant legal or commercial requirements of the minimum concentration of acid substances in the natural gas products involved in the area in which they are located. Therefore, to achieve the quality index of commercial natural gas and reduce the energy consumption of each link is the most important link in the design and construction of natural gas inst...

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Problems solved by technology

[0003] At present, relevant adsorption methods have been developed on the market to dehydrate the feed gas from well sources or storage tanks, and then treat the dehydrated gas stream to remove acidic substances contained in it; the commonly used method Reliance on various molecular sieves as well as physical and subcooled liquids have the side effect that the heavier hydrocarbons contained in the liquid are removed along with the acidic material, making it difficult to recover hydrocarbons which will significantly increase recovery costs

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