Ground freezing with


A watery saline solution mainly consisting of calcium chloride (CaCl2) is used as a refrigerant for brine freezing.
In practice, a freezing plant cools the brine solution down to temperatures ranging from -30° C to -38° C. Rotary pumps then feed the brine solution through insulated pipelines and freeze pipes into a closed circuit. The cold brine solution is fed through a downpipe into the freeze pipes. Then, it wells up in the annular gap between the downpipe and the freeze pipe outer casing and flows back into the return pipe and the cooling unit. Between leaving the downpipe and entering the return pipe, the brine warms up by 2 to 3° C relative to the supply temperature.
There are freezing plants available which are especially designed for ground freezing works and have refrigeration capacities of 100 to 500 kW. These freezing plants are completely self-contained and equipped with all necessary ancillary devices such as brine and water pumps, heat ex chang ers and compressors that come in portable, soundproof containers for easy transport. The Max Bögl Group uses state-of-the-art cascade refrigeration plants with ammonia and carbon dioxide as refrigerants.
The freeze pipes, along with the cold insulated pipelines, form a closed system which is made absolutely watertight so that the refrigerant does not get in direct contact with the ground. A cooling unit is installed to remove compression heat from the freezing plant. Depending on the local conditions, a cooling tower operated with water or air is used, or the system can be cooled directly by river or well water Brine freezing is normally used for extended, large-volume freezing works.


Schematic diagram of brine freezing



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