Influence of preliminary cooling of waste gases on energy efficiency of thermal-transformational heat supply system
Journal Title: Вісник Одеської державної академії будівництва та архітектури - Year 2017, Vol 1, Issue 68
Abstract
The authors proposed a new scheme and developed a functional device for a basic system of selecting the heat from waste gases from rotary kilns for industrial and municipal heat supply, which is distinguished by patent novelty. After the traditional and subsequent fine cleaning in the filter, the exhaust gas enters the pre-cooling heat exchanger, then, passing through the contact chambers, enters the heat exchanger for deep cooling. In the heat exchanger, it is slightly heated to prevent the possible appearance of condensate in the chimney. The part of the tap water heated in the heat exchanger passes through the evaporator of the heat pump circuit, in which the selected heat flow heats a part of the water coming from the tray in the condenser to heat the corresponding heat carriers to the set temperatures in the heating and hot water supply systems. At the same time, part of the recovered water is taken from the tray to process heat consumption through the site. The reliability of the system is ensured by the fact that the recovery of the circulating water in the tray is ensured by the level of consumption of cold water from the pipeline for technological heat consumption through the drainage section. Based on the analytical dependencies for the respective temperatures and heat flows the heat-energy potential of the stage-by-stage and general cooling of the gas in the «a» - «e» sections of the system is determined. Dependencies have been established to determine the heat flow to be taken for gas pre-cooling, heat flow during the heating of water in the condenser, and cooling of the water in the evaporator of the thermal transformer circuit. The energy efficiency of the heat selection system is determined by the modified dependence of the actual conversion factor, which is represented as a ratio of heat fluxes in the condenser and evaporator. Rational levels of preliminary cooling of gases with a temperature of 75 and 150 оС are determined at which the increase in the efficiency of conversion of energy flows is achieved. At the same time the influence of the ratio of costs and temperatures of the heat carriers of the heating and ventilation systems and hot water supply is taken into account.
Authors and Affiliations
V. D. , Petrash, Y. M. , Polunin, V. S. , Olshanovsky
Keywords
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