Liquefaction process of small-scale natural gas liquefaction units
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The liquefaction processes in natural gas liquefaction plants are generally divided into three categories: cascade liquefaction processes； Mixed refrigerant liquefaction processes, including open, closed, and propane pre-cooling ； Liquefaction process with expanders, including natural gas expansion, nitrogen expansion, etc. When selecting the type of LNG liquefaction process, it is necessary to take into account specific design requirements and surrounding conditions. This involves a comprehensive comparison of the investment costs, specific power consumption, operational requirements, and flexibility of different liquefaction processes; only by considering these factors in light of the actual situation can a decision be made as to which liquefaction process to use. The selection of the liquefaction process for small-scale natural gas liquefaction plants requires consideration of factors such as investment costs, operating expenses, the simplicity of the plant, operational flexibility, degree of automation, parameters of the feed gas, utilization and limitations of exhaust gases, quality requirements for LNG, compressor and drive system, and liquefaction capacity. For example, what kind of liquefaction process is generally suitable for a unit with a capacity of 10,000 Nm3/h?????
It depends on your specific circumstances; in terms of investment costs and safety, the nitrogen expansion process offers greater savings compared to other options. If the daily processing volume is 240,000 cubic meters, the investment required for a mixed refrigerant system is too high; it is initially recommended to use nitrogen expansion or nitrogen-methane. But nitrogen expansion requires the least investment.
Nitrogen expansion technology has been basically mastered in China, allowing for complete domestic production
For small natural gas liquefaction plants, the common process is the mixed-refrigerant liquefaction process, which includes open-type, closed-type, and propane pre-cooling methods； The liquefaction process using expanders includes natural gas expansion, nitrogen expansion, etc. But is there any comparison of these processes? For example, for a capacity of 10,000 Nm3/d, what about comparisons in terms of investment, land requirement, automation, and so on?!~!~!~
What if methane expansion is used?? In that case, there would be no other working fluids... but it’s not clear what the investment and operational aspects would be like!~~!~!~!~
Small liquefied natural gas plants use nitrogen-methane expansion refrigeration; although it has high energy consumption, the investment required is low
Is there a numerical comparison available??? Mixed refrigerant liquefaction process； Are there any comparative data available for natural gas expansion, nitrogen expansion, and methane-nitrogen expansion?
I would like to know whether this type of device requires a centrifugal compressor, a reciprocating compressor, or a screw compressor I would appreciate guidance from experts in this field