Process technology proposal and description of 10MMSCFD BOG liquefying plant（1）
The power consumption of the device under the above products and outputs is shown in Table 1.
Table 1 Theoretical power consumption of main process equipment (kW)
|
Item |
Power (kW) |
Voltage level |
Remark |
||
|
Shaft power |
Motor Power |
||||
|
Refrigeration Compressors |
Main motor |
126 |
160 |
380V, 50Hz |
Screw machine |
|
Oil pump motor |
22 |
22 |
380V, 50Hz |
|
|
|
Oil heater |
2 |
2 |
220V, 50Hz |
Intermittent |
|
|
Space Heaters |
1 |
1 |
220V, 50Hz |
Intermittent |
|
|
Control System |
1 |
1 |
220V, 50Hz |
continuous |
|
|
BOG compressor unit |
1030 |
1250 |
10kV, 50Hz |
Piston machine |
|
|
Various control electricity |
10 |
10 |
220V, 50Hz |
|
|
|
total |
1192 |
1446 |
|
|
|
Device cooling water
The quality of cooling water should meet the requirements of GB50050 "Industrial Circulating Cooling Water Treatment Design Specification". The basic requirements for circulating cooling water are:
Designed watering temperature: 32 ℃
Designed return water temperature: 40 ℃
Designed watering pressure ≥ 0.4 MPa.G
Table 2.2-4 List of circulating cooling water
|
Item |
Circulating cooling water volume (t/h) |
Remark |
|
BOG compressor |
110 |
|
|
Refrigerant compressor |
14 |
|
|
total |
124 |
|
System Overview
Process flow chart
The low-temperature BOG first enters the cold box to be reheated to room temperature and then enters the BOG compressor for pressurization. The pressurized BOG enters the liquefaction cold box, is cooled, liquefied, and supercooled in the plate-fin heat exchanger, and returns to the LNG storage tank as an LNG product after throttling for the LNG plant.
The main process technology of this device is:
The MRC (mixed refrigerant) cycle refrigeration process is used to liquefy all BOG ;
This process system includes:
BOG compressor unit;
Mixed refrigerant refrigeration unit;
System Description
Feed gas compressor unit
1) Process description
The low-temperature BOG from the upstream first enters the cold box for cold energy recovery and reheating to room temperature, then enters the BOG compressor to be pressurized to 1.1 MPa.g before entering the downstream.
Its main process equipment is BOG compressor.
2) Design parameters
Processing capacity: 10MMSCFD
Inlet pressure: 0.087MPa.g
Outlet pressure: 1.1 MPa.g
3) Scope of application: 50%~110%
Contact:
Sichuan Rongteng Automation Equipment Co., Ltd.
Phone/WhatsApp/Wechat : +86 177 8117 4421
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