Natural gas desulfurization
Unit Function
The acid gas removal unit in a natural gas processing plant can effectively remove acid components such as H2S, CO2, COS, and RSH from natural gas. A shallow removal process is suitable for producing commercial natural gas (with total sulfur less than 60 mg/m3, H2S less than 6 mg/m3, and CO2 less than 3% mol). A deep removal process is used for LNG pretreatment (with purified gas H2S content ≤ 4 ppm, CO2 content ≤ 50 ppm, and organic sulfur content ≤ 20 mg/m3). Currently, the mainstream international methods for acid removal include the amine gas treatment process and solid desulfurization process.
Technical features
- Natural gas desulfurization and decarbonization can use mixed amine or proprietary amine technology
- For conditions with a large amount of H2S removal and low CO2 content in the raw gas, the MDEA method for desulfurization is used
- Applicable to conditions with large amounts of CO2 removal without H2S, the activated amine method is used for decarbonization
- For conditions requiring the removal of organic sulfur, a patented solvent wet method for crude removal of organic sulfur can be used in conjunction with molecular sieve for fine removal of organic sulfur
Amine Absorption Technology
The mild removal process is suitable for the production of commercial natural gas (with purified gas containing CO2 ≤ 2% mol, H2S ≤ 6 mg/m3), while the deep removal process is suitable for LNG pretreatment (with purified gas containing CO2 ≤ 50 ppm, H2S ≤ 4 ppm).
Main Advantages
- Utilizes patented solvents, specifically tailored for deep and mild acid gas removal.
- The solution has excellent chemical stability, low regeneration energy consumption, is not prone to degradation or deterioration, and has low corrosiveness.
- For feed gas containing both H2S and CO2, a selective desulfurization process can be used, reducing solution circulation and equipment investment.
- Employs efficient filtration and separation equipment and components to inhibit solution foaming, reducing amine solution loss.
- Offers the option to use high-efficiency new tray towers, energy recovery circulation pumps, and new high-efficiency plate heat exchangers for energy savings and consumption reduction.
Optional Configurations
- For low-sulfur decarbonization units, an acid gas incinerator can be optionally equipped to protect the environment and personnel safety.
- For processing plants lacking a water cooling system, an amine solution air cooling system can be provided, eliminating the need for circulating water.
- Regeneration heat sources can be selected from low-pressure steam or thermal oil systems.
Solid Adsorption Desulfurization Technology
This method removes H2S by reacting it with solid desulfurizers. Multiple desulfurization towers are set up to allow desulfurizer replacement without halting operations.
Main Advantages
The processed H2S content can be reduced to ≤6mg/m3 or ≤20mg/m3 as required, with a wide treatment capacity ranging from 0.1x104m3/d to 50x104m3/d. The technology is mature and reliable, easy to operate, and requires low investment.
It can be equipped with automatic H2S detection and automatic switching to enhance automation levels.
Different desulfurizers, such as Fe2O3, activated carbon, or specialized desulfurizers, can be selected according to user requirements.
