IMPROVING THE ENVIRONMENTAL PERFORMANCE OF CHIMNEYS OF BOILER PLANTS WITH HEAT RECOVERY SYSTEMS

The researches results of thermotechnical and environmental parameters of emissions from chimneys of gas-fired boiler plants equipped with systems for deep heat recovery of exhaust gas are presented. The issues of the expediency of using heat methods for preventing condensation formation in chimneys to improve their environmental friendliness are considered. These are methods of partial bypassing of boiler exhaust gases past the heat recovery equipment, predrying the exhaust gases cooled after heat recovery in heat exchangers-gas heaters and mixing dry and heated air from the boiler room air heater to these gases. The efficiency of using these methods in order to improve the environmental performance of chimneys is analyzed. A relative decrease in the maximum surface concentration of such harmful emissions as nitrogen and carbon oxides due to the use of these heat methods has been determined. Comparison of the effectiveness of the application of these methods to improve the environmental friendliness of the considered chimneys is carried out. It is shown that the proposed methods used for anticorrosion protection of chimneys of boiler plants when using heat recovery technologies with deep cooling of flue gases contribute to an increase in the environmental friendliness of these chimneys.