Abstract
The results of studies on improving the environmental characteristics of boiler plants of municipal heat-power engineering in the application of technologies for the deep recovery of heat from exhaust-gases of gas-fired boilers are presented. The data on the reduction of environment by reducing the amount and temperature of harmful emissions resulting from fuel combustion are given. The data are given for boiler plants equipped with complex heat-recovery systems characterized by cooling the exhaust-gases below the dew point of the water vapor contained in them. It is shown that the decrease in emissions is due to a decrease in fuel consumption in boilers due to the beneficial use of the heat of exhaust-gases in these systems and the dissolution of nitrogen and carbon oxides in the condensate, formed in the heat-recovery equipments. The analysis of improving the environmental safety of boiler plants when used in heat-recovery technologies of corrosion protection systems for chimneys has been performed. Anticorrosion protection is provided by preventing condensate formation in the exhaust-gas ducts of boiler plants when using technologies for the deep recovery of exhaust-gas heat. To prevent condensate formation, the method of pre-drying cooled exhaust-gases in a heat exchanger-preheater installed after heat-recovery equipment is used. It is also shown that the use of complex heat-recovery systems provides in the boiler plant additional water in the form of condensate formed during condensation of moisture from exhaust-gases. Receipt of this condensate is another ecological effect of heat-recovery, which allows reducing the consumption of natural water resources for supply municipal heat networks.
Highlights
At present, the problems of rational use of fuel and energy resources and improvement of the ecological situation are priorities in the world energy practice
The results show that the use of air and water heat-recovery exchangers provides a level of reduction of harmful emissions during the heating period in the ranges of 2.1–4.0% and
It should be noted that the realized of the condensation mode in the complex heatrecovery systems of boiler plants in addition to reducing harmful emissions by increasing the efficiency boiler is characterized by an additional effect
Summary
The problems of rational use of fuel and energy resources and improvement of the ecological situation are priorities in the world energy practice. These technologies provide a reduction in fuel consumption in the boiler due to a decrease in the exhaust-gas temperature through the beneficial use of their heat.
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