The heat flux of the evaporator of the thermal-transformer circuit in the improved utilization system of exhaust gases heat
Journal Title: Вісник Одеської державної академії будівництва та архітектури - Year 2018, Vol 1, Issue 73
Abstract
The improved heat recovery system from the exhaust gases of rotary kilns works in a similar way to the previously developed system. After the conventional dust cleaning, the exhaust gases from the rotary kiln are fed into the fine filter and sent to the recuperative heat exchanger for preliminary cooling. The gases then successively pass through the first contact chamber for pre-cooling and humidification, and then the second for deeper cooling. A feature of heat and mass exchange processes is that in the first pre-cooling section the process of contact interaction of the flows passes at a higher water temperature after the heat exchanger. In the second section takes place a deeper pre-cooling of the vapor-gas mixture. As a result, water from the pallet enters the condenser of the heat pump plant and then enters with non-separated flow into a heat exchanger for heating in the process of preliminary cooling of the original exhaust gases. At the same time, the component of traditional recuperative heat extraction increases with simultaneous increase in the degree of purification of exhaust gases in the system. Regeneration of water in the pallet of the contact chamber is realized by a similar principle of increasing its flow rate at the initial heat-technological cycle of the production process, as in the basic scheme. A multi-factor dependence of the heat flux selection in the evaporator is based on the results of the analytical study, which takes into account the initial and regime parameters of the structural subsystems. Obviously, the determining parameter is the water flow for hot water supply, its ratio with the consumption of cold water, and heat and mass exchange factors in the process of interaction between the heating and heated medium in the path of contact-recuperative and thermal transformer transformation of the exhaust gas, that streams to the exhaust pipe. The established dependence is the basis for determining the technical and economic indicators and the energy efficiency of the improved system for industrial and household heat supply.
Authors and Affiliations
V. D. , Petrash, Y. M. , Polunin, V. O. , Makarov
Keywords
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