IMPROVED TECHNOLOGY IN THE LIQUEFACTION OF NATURAL GAS AT GAS DISTRIBUTION STATIONS TO GIVE THE PRODUCT OF HIGH PURITY

Abstract

The most effective is a small-tonnage production of liquefied natural gas (LNG) at gas distribution stations of gas mains. When implementing this technology necessary to use large systems for prior drying, and purification natural gas from CO2. The cost of treatment systems can be 40...60 % of the cost throughout the LNG unit. To reduce the cost of treatment system is proposed the flow of natural gas divided on the technology and production, on the last of which accounts for 10...30 % coming in the unit of natural gas. During the transition to this double-flow schemes of as purification system cost of CO2 decreases by 6-10 times. Order to increase methane content up to 99 % or more in the productional flow and reducing the CO2 concentration up to the level 50-100 ppm is necessary in low temperature part of LNG use the clean vapors separation by fractional evaporation with their subsequent recondensation.