Study on Air-Cooled Heat Exchanging Technology with Natural Cold Energy for Ground Freezing Project in Cold Region
NING Fang-bo
CHEN Hong-Lei
Abstract：In North-West China ,there was sufficient natural cold energy in winter .In order to effective-ly utilize the natural cold energy for the mine shaft freezing ,a fin tube type brine air cooled heat ex-changer was designed .A brine air cooled heat exchanging experiment was conducted in a low tempera-ture cold storage .The results showed that the cooled air temperature could highly improve the air cooled heat exchanging effect .The air and brine flow increased could lowly improve the air cooled heat exchanging rate .In order to evaluate the engineering practices of the air cooled brine ,based on a mine main shaft freezing project of Luxin Mine in Xilingele League as a background ,the numerical simula-tions were conducted on the temperature field of the freezing wall formed with three different tempera-ture brines .The results showed that under the same borehole spacing ,the connection time of the free-zing walls formed with the quasi-low temperature (-10~ -15 ℃) brines was 1.5~2 times of the arti-ficial refrigerated brine and would be 1/2 of the local winter time .After the borehole spacing properly reduced ,the freezing wall connection time would be equal to the connection time of the artificial refri-geration brine under the normal borehole spacing .The experiment and numerical simulation showed that with the utilization of the brine air cooled heat exchanging technology ,the development and utili-zation of the natural environment cold energy could be applied to the mine shaft freezing .
Keywords：ground freezing project in cold regionnatural cold energyair-cooled heat exchanging tech-nologyquasi-low temperature brinenumerical simulation
Publication Date：2015-08-17
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 29-35 )