The optimization of energy resource structure has taken place in the world, because environment protection is attracting increasingly more attention. Since LNG (liquefied natural gas) is regard as the cleanest energy worldwide, more and more countries tend to use LNG with respect to its cleanness.

Our company began to develop LNG purification and liquefaction plant as early as in 1980s. Until now we have provided about 30 sets of LNG separation plants. The technique includes expander process, MRC mixed cold process and so on. We also made the first set of 100% skid-mounted LNG plant (50000Nm3/day) in China, which was installed in Inner Mongolia in 2015.

Features of our skid-mounted LNG plants
1. Highly compact skid-mounted structure: total 3 parts including
1) Metering, pressure control & purification system package;
2) Liquefaction system;
3) Public utility and accessories. After all packages reach the job site, the client only needs to connect the flanges, pipelines, etc. Once the LNG plants set on the foundation skid, which greatly reduces workload on site.
2. Highly integration of prevailing internet of objects technology (IOT): DCS self-control system;
3. Short time of construction and high efficiency: 3-6 months for manufacturing, while only 15 days for installation and commissioning.
4. Furthermore, the LNG plants are featured by small land occupation, environmental friendly and low energy consumption. Hence the whole LNG plant can be installed on a field of 60*60m, the main equipment/device is only about 16.5*16.5m. During very short period, the whole plant can be easily moved from one to another;

Natural gas pre-treatment and purification system including:
1. Desulphurization decarbonization system
Process: (MDEA+MEA) mixed amine method
(MDEA+ activator) MDEA method
Software: AMSIM, recognized by Chinese authorities
Results: CO2＜50ppm, H2S＜4ppm

2. Dehydrating system
Dehydration by using 4A molecular sieve
Process by using three towers (or two towers): need less regenerative gas, so that it is more stable in operation
Besides, molecular sieve dryer: designed in accordance with GB150 and tested by fatigue analysis

3. Mercury removal system: 10ng/nm3
The sulfur-loaded activated carbon is used to adsorb mercury, while it can be used for 3-5 years. Since it is one tower or two towers, no need for regeneration. Moreover, a filter is set behind the mercury removal system.

4. Aromatic hydrocarbon and heavy hydrocarbon removal system
From heavy hydrocarbon separator in the cold box, the heavy hydricarbon is separated and then adsorbed by scrubbing solution. After that, it goes out from tower bottom, gets separated, and at last gets stored in the storage tank.

Main processes/methods used for natural gas liquefaction by LNG purification and liquefaction plant:
1) expansion refrigeration circulation 
Nitrogen methane expansion or nitrogen double expansion with freon as pretreatment, while is mainly used for small type liquefaction plant with a capacity of 300,000 m3/day or below;
2) single mixed refrigerant circulation
Divided into both single stage throttling and multi stages throttling.
Liquefaction capacity: 300-2,000,000 m3/day
3) multi-refrigerant circulation 
Mixed refrigerant circulation with propane as pretreatment; while liquefaction capacity: 2,000-10,000,000 m3/day.
Besides, multi mixed refrigerant circulation with propane as pretreatment and mixed refrigerant circulation by nitrogen expansion for supercooling; while liquefaction capacity: 10,000,000 m3/day or above;

Furthermore, only an elite team of experts from cryogenic, instrument and electronics fields is able to plan a perfect LNG purification and liquefaction plant project. In addition, the ability of processing and manufacturing must be supportive. Especially, the key technology and equipment, such as liquefaction cold boxes and tanks, are all necessary to fulfill the project. We are proud to have a strong design team as well as a manufacture team. As a result, with our rich experience, we are able to design, manufacture and install complete sets of natural gas liquefaction plant for different customers. We will help you to build your exclusive LNG purification and liquefaction plant, which is both reliable and energy-saving.