Brief of Process Flow
1 .Brief description of the process
Natural gas light hydrocarbon recovery plant (hereinafter referred to as “plant”) recovers natural gas into dry gas, LPG , OIL.
In order to make the proposed plant safe, reliable, easy to operate and maintain, the plant will be designed with mature and reliable technology, so that the process is simple, the operation is flexible, the work is reliable, and the maintenance is convenient.
1.1 Natural gas booster system
1) Process description
Due to the low pressure of natural gas, it needs to be pressurized to a suitable pressure to ensure the demand for refrigeration.
2) Design parameters
Feed gas treatment capacity 35347.2Nm3 /h
The pressure after boosting 3.0MPa
The pressure after boosting 4.5MPa
After boosting, the temperature is 45 ℃
1.2 Natural gas dehydration system
1) Process description
The presence of moisture in natural gas often causes serious consequences: moisture and natural gas form hydrates or ice block pipelines under certain conditions.
Natural gas dehydration adopts molecular sieve adsorption method. Because molecular sieve has strong adsorption selectivity and high adsorption characteristics under low water vapor partial pressure, this device uses 4A molecular sieve as dehydration adsorbent.
This unit adopts a two-tower process to absorb moisture, uses TSA method to analyze the moisture adsorbed in the molecular sieve, and uses condensation method to condense and separate the moisture desorbed from the adsorbent.
2) Design parameters
Feed gas treatment capacity 35347.2Nm 3 /h
Adsorption pressure 4.5MPa
Adsorption temperature 45 ℃
Regeneration pressure 4.5 MPa
Regeneration temperature 220~260 ℃
Regenerative heat source heat transfer oil
H2O content in the purified gas <1 0 ppm
1.3 Natural gas refrigeration system
1) Process description
After dehydration and dust filtration, natural gas enters the heat exchanger and enters the propane pre-cooling system after the temperature drops to 0°C. After throttling, the temperature drops to -30°C and then enters the low-temperature separator. The gas phase of the low-temperature separator returns to the heat exchanger to raise the temperature to 30°C, and the liquid phase enters the de-ethane tower.
2) Design parameters
Feed gas treatment capacity 35347.2Nm 3 /h
Working pressure 4.5MPa
Inlet temperature 0℃
Outlet temperature -30℃
1.4 De-ethane and de-butane system
1) Process description
The heavy hydrocarbons coming out of the heavy hydrocarbon separator are depressurized and then enter the de-ethane tower. The top of the tower is the removed methane and ethane, and the bottom of the tower is heavy hydrocarbons C3+.
C3+ heavy hydrocarbons removed by the de-ethane tower enter the LPG tower, the top product of the tower is LPG, and the bottom product is light oil OIL.
2) Design parameters
De-ethane tower working pressure 1.3 MPa G
De-butane tower working pressure 1.2 MPa G
3.1.5 Heavy hydrocarbon storage system (temporarily designed for storage of 5 days )
1) Process description
Product LPG and NGL product storage.
2) Design parameters
LPG storage tank
Working pressure 1.2 MPa G
Design temperature 80 ℃
Volume 100m3 X3
OIL storage tank
Working pressure 1.2 MPa G
Design temperature 80 ℃
Volume 100m3 X2
1.6 Natural gas export system
Pressure of natural gas after decarburization, dehydration and dehydrocarbon is 1.25 MPa and export as dry gas.
Contact us:
Sichuan Rongteng Automation Equipment Co., Ltd.
www. rtgastreat.com
E-mail: sales01@rtgastreat.com
Phone/whatsapp: +86 138 8076 0589
Address: No. 8, Section 2 of Tengfei Road, Shigao Subdistrict,
Tianfu New Area, Meishan city, Sichuan China 620564
Post time: Jul-31-2023
