Torch gas (associated gas) light hydrocarbon recovery plant (hereinafter referred to as “plant”) recovers torch gas (associated gas) into dry gas and NGL.
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 Torch gas (associated gas) booster system
1) Process description
Due to the low pressure of torch gas (associated gas), it needs to be pressurized to a suitable pressure to ensure the demand for refrigeration.
2) Design parameters
Feed gas treatment capacity 12000Nm3 /h
The pressure after boosting 0.3MPa
The pressure after boosting 4.5MPa
After boosting, the temperature is 45 ℃
2 Torch gas (associated gas) dehydration system
1) Process description
The presence of moisture in torch gas (associated gas) often causes serious consequences: moisture and torch gas (associated gas) form hydrates or ice block pipelines under certain conditions.
Torch gas (associated 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 12000Nm 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
3 Torch gas (associated gas) refrigeration system
1) Process description
After dehydration and dust filtration, torch gas (associated 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 12000Nm 3 /h
Working pressure 4.5MPa
Inlet temperature 0 ℃
Outlet temperature -30℃
4. Heavy hydrocarbon storage system (temporarily designed for storage of 5 days )
1) Process description
Product LPG and NGL should be stored.
2) Design parameters
LPG storage tank
Working pressure 1.2 MPa G
Design temperature 80 ℃
Volume 100m3 X6
5. Torch gas (associated gas) export system
Pressure of torch gas (associated gas) after decarburization, dehydration and de-hydrocarbon is 1.25 MPa and export as dry gas.
Contact:
Sichuan Hengzhong Automation Equipment Co., Ltd.
Phone/WhatsApp/Wechat : +86 177 8117 4421 +86 138 8076 0589
Website: www.rtgastreat.com Email: info@rtgastreat.com
Address:No. 8, Section 2 of Tengfei Road, Shigao Subdistrict,Tianfu New Area, Meishan city, Sichuan China 620564
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Post time: Jun-30-2023