Compressed natural gas (cng) sub-cooling system for cng-filling stations

Abstract

The present invention is referred to a compressed natural gas (CNG) sub-cooling system for CNG-filling stations, comprising a CNG inlet pipeline coming from the CNG compressor, a set of coils connected to an expansion heat exchanger capable of creating a Joule-Thomson cooling effect on the gas, both coils are immersed in a heat exchange facilitator solution and are also connected to outlet valves which in turn are connected to feeding hoses of a charging station.

1 . Compressed natural gas (CNG) sub-cooling system for CNG-filling stations, comprising a CNG inlet from a CNG compressor, at least two independent coils through one of them circulates the gas to be cooled and through the other one the gas from the CNG line, said coil with the gas to be cooled is also connected to an expansion heat exchanger capable of creating a Joule-Thomson cooling effect on the gas, both coils are immersed in a heat exchange facilitator solution and are also connected to outlet valves which in turn are connected to feeding hoses of a charging station. 
     
     
         2 . The sub-cooling system of  claim 1 , wherein each system includes two pairs of coils, each pair with a heat exchanger and an expansion heat exchanger. 
     
     
         3 . The sub-cooling system of  claim 1 , wherein the solution in which the coils are immersed is a solution of water and glycol.