Deep desulfurization system for natural gas and desulphurization method

Abstract

The invention discloses a deep desulfurization system for a natural gas and a desulphurization method. The deep desulfurization system comprises two desulfurization devices which are connected in parallel, a gas tank and a tail gas device, wherein a catalyst feeding hole, an extractant or H2O2 feeding hole, an H2S gas inlet, a tail gas outlet and a water or extractant liquid outlet are arranged in each desulfurization device; each H2S gas inlet is connected with the gas tank and each tail gas outlet is connected with the tail gas device; and a stirrer, a filter membrane and a gas diffuser are arranged in each desulfurization device. The desulphurization method comprises the steps of firstly adding a catalyst and H2O2 to one desulfurization device for reactive desulfurization, discharging a tail gas; after the catalyst is deactivated or the H2S removal rate is reduced, shutting down the desulfurization device and starting the other desulfurization device for desulfurization; and separating and purifying elemental sulfur by employing an extractant as a leaching agent. The deep desulfurization system integrates multiple processes of oxidative absorption, catalyst regeneration, extractant circulation, water circulation and elemental sulfur recycling; simultaneous implementation of deep desulfurization of the natural gas and elemental sulfur recovery is achieved; the content of a hydrogen sulfide tail gas is lower than an emission limit value; the conversion rate reaches 95-99%; and the deep desulfurization system has the characteristics of being safe, efficient and free of a secondary pollutant.

Description

technical field [0001] The invention relates to a desulfurization method, in particular to a safe and environment-friendly natural gas deep desulfurization system and a desulfurization method thereof. Background technique [0002] With the requirements of the sustainable development strategy and the national policy of environmental protection, natural gas, as a clean and efficient high-quality energy source, has great development prospects ]. Natural gas is extracted from the wellhead of the gas well or separated from the field separator, and then enters the desulfurization device to remove the contained acid gas hydrogen sulfide (H 2 S), the wet natural gas from the desulfurization device is sent to the dehydration device for dehydration treatment, and the purified natural gas is transported to the user through the gas pipeline [Yao Chunxu. Research on desulfurization and decarbonization process of high-sulfur natural gas in Northeast Sichuan[J]. PetroChina University (Ea...

AI Technical Summary

Problems solved by technology

[0007] The second technical problem to be solved by the present invention is to provide a safe, efficient and environmentally friendly natural gas deep desulfurization system to solve the problem of H 2 S harmless treatment of the problem, and realize the deep desulfurization of natural gas and the recovery of elemental sulfur at the same time

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