Abstract
Various designs for condensation utilizers of the low-grade heat of furnace gases that are constructed based on an open-type heat exchanger are considered. Computational investigations are carried out for the effect of the condensation utilizer with tempering and moistening of air on the operation of steam and hot-water boilers burning natural gas. The investigations are performed based on the predeveloped adequate calculating models of the steam and hot-water boilers in a Boiler Designer program complex. Investigation results for TGM-96B and PTVM-120 boilers are given. The enhancement of the operation efficiency of the condensation utilizer can be attained using a design with tempering and moistening of air supplied to combustion that results in an insignificant increase in the temperature of waste gases. This has no effect on the total operation efficiency of the boiler and the condenser unit, because additional losses with waste gases are compensated owing to the operation of the last. The tempering and moistening of air provide a substantial decrease in the temperature in the zone of active combustion and shortening the nitrogen oxide emission. The computational investigations show that the premoistening of air supplied to combustion makes the technical and economic efficiency of boilers operating with the Condensation Utilizer no worse.
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Original Russian Text © I.L. Ionkin, A.V. Ragutkin, P.V. Roslyakov, V.M. Supranov, M.N. Zaichenko, B. Luning, 2015, published in Teploenergetika.
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Ionkin, I.L., Ragutkin, A.V., Roslyakov, P.V. et al. Effect of a condensation utilizer on the operation of steam and hot-water gas-fired boilers. Therm. Eng. 62, 352–358 (2015). https://doi.org/10.1134/S0040601515050031
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DOI: https://doi.org/10.1134/S0040601515050031