INTENSIFICATION OF PROCESSES IN ENERGY EXCHANGERS FOR COOLING OR HEATING OF LIQUIDS BY MEANS OF GAS BUBBLING

摘要

In the traditionally applied heat exchangers the energy of cold and heat is transferred to users through a metal impermeable wall. Such a low effective method of energy transfer in combination with bulky and a high metal-intensity of these heat exchangers results in large expenditures of energy carriers both for their manufacturing and exploitation, and heat and cold production. In its turn, it results in additional fuel burning up. In many processes and technologies such heat exchangers can be replaced by the ones with using of bubbling of gaseous energy carrier through the cooled or heated users as liquids or gases. The energy carrier is supplied through the perforated surface in the volumes of users. Such energy exchangers are the alternative ecological safety and energy saving ones. The intensity of heat-and mass transfer increases by the factor of 20-500 in comparison with traditional heat exchangers by means of creation of specific hydraulic-acoustic regimes in two-phase gas-liquid mixture of bubbling gases and cooling or heating liquids. Here, the formed bubbles bubble the liquid in oscillating-pulsating regime. The rate of energy transfer can reach 24000 W/(m{sup}2·K) instead of 200-400 W/(m{sup}2·K) for the heat exchanger with heat transfer through the metal impermeable wall. Therefore, for transmission of one and the same amount of energy in comparable designs of energy exchangers the surface of the bubbler can be decreased by a factor of 100-200. Such energy exchangers result in enormous saving of fuel, energy carriers, metals, financial and human-effort expenditures in different branches of machine-building and petrochemical industries, as well as in processing products and of storing.