IMPROVING THE ENVIRONMENTAL SAFETY OF BOILER PLANTS CHIMNEYS

Abstract

The study results of heat engineering and environmental indicators of emissions from chimneys of gas-consuming heating boiler plants equipped with systems for deep heat recovery of exhaust gas are presented. The issues of the application heat methods efficiency to prevent condensate formation in these pipes to improve the environmental safety of chimneys when using heat-recovery technologies are considered. Methods such as partial bypassing of boiler exhaust gases past heat-recovery equipment, drying of the exhaust gases cooled after heat-recovery in heat exchangers-gas heaters and mixing dry and heated air from the boiler house air heater into the cooled gases have been studied. The effectiveness of using these methods to improve the dispersion conditions in the environment of harmful emissions contained in the flue gases of gas-consuming boilers has been analyzed. The relative decrease in the maximum surface concentration of such harmful emissions as nitrogen and carbon oxides due to the use of specified heat methods in heat-recovery systems has been determined. Comparison of efficiency indicators of the proposed methods and their ranking to improve the conditions for the dispersion of harmful emissions by chimneys of various types is carried out. It is shown that the proposed methods, usually used for corrosion protection of boiler plants chimneys using heat-recovery technologies with deep cooling of exhaust gases, also contribute to improving (up to 32 %) of the environmental friendliness of these pipes. The ranking of the considered heat methods is carried out.