CH4LNG is the AB solution for RNG liquefaction, designed to be installed downstream of a BIOCH4NGE® system, with which it integrates perfectly.
It is based on an integrated cryogenic process, at low operating pressure, divided into 3 phases: treatment, liquefaction and storage.
Treatment: in the first part of the process, the TSA (Temperature Swing Adsorption) purification system lowers the moisture and CO₂ content through molecular filters and sieves.
Liquefaction: through several cooling stages, the RNG under pressure passes to the liquid state and is made available at conditions of <-145° C and 3 barg. The heart of the CH4LNG process is the cryo-cooler, based on Stirling Cryogenics technology, which is an alternative machine that generates cooling power by compressing and expanding helium in a closed cycle.
Storage: the bio-LNG is conveyed to a transfer tank, where the desired pressure and temperature conditions of the final product are achieved.
The cryogenic process underlying CH4LNG uses only electrical energy, excluding the liquefaction of RNG by heat exchange with liquid nitrogen in an open cycle ("disposable") as micro-liquefaction presents more demanding conditions in terms of efficiency and flexibility. For this reason, CH4LNG is the self-sufficient containerized modular solution, without the use of liquefied technical gases, also available for small and very small sizes, with competitive CAPEX and OPEX, plug-in operation and no N₂ consumption.