Natural Gas Sector
1. Skid-mounted liquefaction equipment (natural gas, shale gas, coalbed gas and associated gas)
Skid-mounted liquefaction equipment includes pressure regulating unit, pre-treatment unit, liquefaction unit, storage and transportation unit and supporting power supply unit, control unit, etc. The integrated design is adopted for the daily processing capacity below 30000m3. The compressor and the cold box are integrally packaged in one skid. There is no need to connect the pipeline at the refrigerant side on the site, so as to avoid the risk of refrigerant leakage. Make the skid-mounted liquefaction unit more compact and easier to be skid-mounted.
Application of skid-mounted LNG liquefaction equipment
Pipeline gas peak regulation
Short-term supply of liquefied gas source
Oil-field associated gas
Remote gas well
Various unconventional natural gas (coalbed gas, shale gas, biogas, industrial tail gas)
Characteristics of skid-mounted LNG liquefaction equipment
Serified daily liquefaction volume of natural gas (10000~30000~60000~100000~150000~300000/d)
The skid-mounted overall equipment consists of 3-6 standard skids (12m × 3m × 3.5m)
Advantages of skid-mounted LNG liquefaction equipment
Flexibility: Vehicular movement between different air sources
Stability: fixed model selection, standardized production and product stability of all equipment
Convenience: the main modules of the equipment are built in the factory, and the on-site installation is simple and convenient
Small land occupation: small land occupation
Economy: short payback period
Fast delivery: 2~4 months for equipment delivery
2. Purification equipment (deacidification, dehydration and heavy hydrocarbon removal)
Pretreatment before treatment
Hazard and control index of impurities in raw materials
The impurities to be removed from conventional feed gas mainly include liquid free water, solid particles H2O. Sour gas (including CO2, H2S), etc. Firstly, acid gas is removed by alcohol amine method, and then impurities such as water, heavy hydrocarbon and mercury are removed by molecular sieve adsorption.
Purification indexes are shown in the following table
Impurity name control index
Water ≤ 1ppm (v)
CO2 ≤50ppm(v)
H2S ≤5ppm(v)
Total sulfide ≤ 5mg/Sm ³
Mercury ≤ 0.1 μ g/Sm ³
Aromatic compound ≤ 50ppm (v)
Remove acidic gas
The methods for removing acid gas mainly include molecular sieve adsorption method, alcohol amine method, modified hot potassium method, sulfonamine method, etc. The solvent to be removed and process selection are mainly based on: feed gas composition, pressure, product specification requirements, total cost and operation cost estimation, etc. The deacidification unit of Hongke Qingneng will be designed separately according to the gas composition and site working environment, mainly based on ethanolamine method.
dehydration
Natural gas dehydration methods mainly include absorption method and adsorption method. For small-sized projects, molecular sieve adsorption method is recommended for dehydration, because this method has strong adsorption capacity (even under low water vapor partial pressure, it also has high adsorption capacity) and can further remove residual acid gas at the same time. Moreover, the molecular sieve dehydration unit is simple in operation, compact in area and suitable for small-sized projects. Regeneration gas of molecular sieve system comes from BOG recovered from cold energy in reliquefaction unit.
Removal of Trace Mercury and Aromatic Hydrocarbons
A special sulphur impregnated coal-based activated carbon is used to remove possible trace amounts of mercury. Use special adsorbents to remove possible aromatic hydrocarbons.
Well gas skid-mounted liquefaction equipment Pipeline gas skid-mounted liquefaction equipment
Shale gas skid-mounted liquefaction equipment Oil associated gas liquefaction equipment
3. Liquefaction Plant
EPC General Contractor
Supply of complete equipment
Construction safety management, startup guidance and technical training
Technical service
Long-term operation and maintenance service
4. BOG reliquification equipment
Provide BOG reliquefaction unit for LNG storage tanks of various specifications and tank car filling station, with a processing capacity of 50~5000Sm ³/d. Low energy consumption, full automation and high reliability of the unit.
5. Light hydrocarbon recovery and mixed hydrocarbon separation equipment
For the oilfield associated gas produced by small oil fields, the low temperature separation method is adopted for light hydrocarbon recovery to separate the mixed light hydrocarbon and dry gas products, so as to achieve the purpose of comprehensive utilization of oil and gas resources. Further, the mixed hydrocarbon can be fractionated to produce stable light hydrocarbon and LPG products; Dry gas can be further liquefied into LNG products at low temperature to increase added value.
