100MMSCFD natural gas desulphurization skid with MDEA solution process
Sichuan Hengzhong Clean Energy Equipment Co., Ltd., was born in 2012 and we can provide solutions and equipment package for wellhead treatment equipment, natural gas conditioning equipment, sulfur recovery package, LPG extraction and NGL recovery unit, LNG liquefaction plant, hydrogen production unit, helium extraction package, gas generator sets.
A complete desulphurization skid includes three systems: process system, instrument control system and utility system. According to the different air sources, it can be changed.
According to the actual situation of gas source, we adopt the best process and the most economical scheme to meet the different requirements of customers. Skid mounted equipment makes transportation and installation more convenient.
- Main process of using MDEA solution removing CO2 and H2S:
Natural from upstream enters the acid removal unit, which uses MDEA solution to remove acid gases such as CO2\H2S from the raw gas.
Natural gas enters the absorber from the bottom and flows upward. The fully regenerated MDEA solution (lean solution) enters the absorber from the top and flows downward. The countercurrents of the MDEA solution and natural gas fully contact the absorber, absorbing the CO2 and H2S in the gas and transferring them to the liquid phase. Unabsorbed components are drawn from the top of the absorber and enter the deacidification gas cooler and separator. The gas exiting the deacidification gas separator enters the feed gas pre-cooling unit, and the condensate is sent to the flash tank.
The CO2 content in the treated natural gas is less than 50 PPM, and the H2S content is less than 4 PPM.
The MDEA solution that has absorbed CO2 and H2S, called the rich liquid, is sent to the flash tower, where the pressure is reduced and the resulting flashed natural gas is sent to the venting system. The flashed rich liquid then exchanges heat with the solution (lean liquid) flowing out of the regeneration tower's bottom. The temperature is then raised to ~203 °F and sent to the upper portion of the regeneration tower, where it undergoes stripping and regeneration until the lean liquid reaches the target concentration.
The lean liquid from the regeneration tower passes through the lean-rich liquid heat exchanger and the lean liquid cooler, is cooled to 113 °F, and is pressurized by the lean liquid pump before entering the upper part of the absorption tower.
The outlet gas from the top of the regeneration tower passes through the acid gas cooler and enters the acid gas separator. The gas exiting the acid gas separator is sent to the acid gas discharge system, and the condensate returns to the MDEA buffer tank.
The heat source of the regeneration tower reboiler is heated by thermal oil .
The main process equipment of this unit is absorption tower and regeneration tower.
Design parameters：
Processing capacity: 100MMSCFD
Design point of CO2 content in raw gas:5% (mol % )
H2S content in the raw gas is 8ppmv
Absorption tower operating pressure: 986.1psig
Absorption tower operating temperature:104 ℉ ~140 ℉
Regeneration tower operating pressure: 4.351psig~7.252psig
Regeneration tower operating temperature: 203 ℉ ~257 ℉
Regenerative heat source: Thermal oil heating
CO2 content in deacidified gas ≤50PPM
gas content in deacidified gas ≤4PPM
3) Scope of application
50 % ~ 110 %
- Instrument control system
In order to effectively monitor the production process of the complete set of equipment, and to ensure reliable operation and convenient operation and maintenance, the instrument control system mainly includes:
Distributed control system (DCS)
Safety Instrument system (SIS)
Fire Alarm and Gas Detector System (FGS)
Closed-circuit television (CCTV)
Analysis system
- Utility system
This system mainly includes: instrument air unit, nitrogen unit, heat transfer oil unit, desalted water unit and cooling circulating water unit.