IMPROVING THE EFFICIENCY AND RELIABILITY OF BOILER PLANTS OPERATION WITH FLUE GAS RECIRCULATION
Abstract
The paper the ways of improving the technologies of heat production in gas-consuming heating boiler plants to improve their environmental efficiency and increase the reliability of operation are investigated. The work purpose is to increase the thermal efficiency of environmentally efficient heating boiler plants and the prevention of condensate formation in their air-supply ducts by using complex heat recovery systems equipped with air heaters. The main objectives of the study are: determination the thermal parameters of a 2 MW heating boiler with a exhaust gas recirculation system into the blown air under the conditions of using complex heat recovery systems; determination and analysis the thermal and humidity parameters of the mixture of recirculation gases and blown air and the levels of increase the boiler units efficiency in different operating modes of boiler plants with the proposed heat recovery systems. Known thermal calculation methods of boiler plants and data from our own experimental studies of heat transfer in heat recovery exchangers of complex systems during deep cooling of boiler plant exhaust gases were used. The thermal calculation results of a heating boiler with the exhaust gas recirculation system mixed with blown air using the proposed heat recovery system are presented. Based on the data obtained, the regularities of changes in the thermal and humidity characteristics (temperature, dew point, and their difference) of the mixture of recirculated gases and air in different boiler modes during the heating period, at the studied particles of recirculation (from 10 to 20%) and various flue gas selection options were established. The research results show that the use of the proposed system by heating the air by 38-42 °C prevents condensation and icing in the air-supply ducts of the boiler plant in all modes of its operation during the heating period under all considered conditions. It is shown that the use of the proposed heat recovery system increases the efficiency of fuel use in such installations. Thus, the use of heat recovery systems with heating of return heating water and blast air under the conditions under consideration provides a resulting increase of efficiency factor in the range of 1.0 - 3.8%.
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