Membrane adsorption natural gas desulfur method

Abstract

A membrane absorption method for removing the acidic gas (H2S, organo-sulfur, etc) from the natural gas in oil-gas field by use of micro-pore hollow fiber membrane includes such steps as introducing natural gas to tubular cavity of membrane separator, penetrating H2S to outside of tubular cavity, absorbing it by absorptive liquid, heating the absorptive liquid by heat exchanger, and regenerating the absorptive liquid while releasing H2S, and pumping the H2S into tail gas tank by vacuum pump.

Description

technical field [0001] The invention belongs to the technical field of oil and gas storage and transportation engineering, in particular to a membrane absorption natural gas desulfurization method. Applied to the purification and separation of natural gas in oil and gas fields, it can effectively remove H in natural gas 2 S, organic sulfur and other acidic gases. Background technique [0002] Natural gas is a mixture of hydrocarbons and various impurity gases, including acid gases such as hydrogen sulfide and carbon dioxide. Hydrogen sulfide in natural gas can reduce the heat capacity of natural gas, corrode pipelines and equipment, and cause great pollution to the air. When the concentration of hydrogen sulfide in natural gas exceeds 0.1%, it can cause death within seconds. Therefore, these hydrogen sulfide gases must be removed from natural gas before use or transportation. [0003] The existing desulfurization technology is mainly wet (amine absorption method, Claus me...

AI Technical Summary

Problems solved by technology

Yang Dehu and Xu Min pointed out (Natural Gas Membrane Process Technology [J]. Inner Mongolia Petrochemical Industry, 2004, 30: 28-30): Wet absorption method is a relatively mature natural gas treatment method, but the method has huge equipment , cumbersome, high investment costs, regeneration and environmental pollution, etc., and the two fluids are completely mixed and contacted, which leads to the interdependence of the two fluids in contact, and the contact equipment will also cause liquid flooding, fog entrainment, channeling, drumming, etc. Bubbles and other phenomena

[0004] Changqing gas field used a single membrane separation technology for natural gas desulfurization (Yu Haojie, Industrial test of unconventional purification methods for natural gas in Changqing gas field, Inner Mongolia Petrochemical, 1997, 23(S1): 54-64), and the results showed that H 2 S efficiency is not high, can only reach 44.58%, remove CO 2 The efficiency can only reach 49.2%, which cannot meet the requirements of pipeline transportation

Images