FIELD: heating.
SUBSTANCE: invention relates to heat-and-power engineering and can be used in processes of cleaning and recovery of smoke fumes of heat-and-power installations for decreasing of greenhouse effect of ambient air. Cleaning method includes cooling of smoke fumes up to temperature lower than dew point with formation of water vapour condensate, cleaning against carbon dioxide by means of absorption, removal of treated gas into atmosphere and desorption from the solution of carbon dioxide, herewith after cooling smoke fumes are mixed to ozone-air mixture and there are removed from there the most part of nitric oxide ensured by acid formation at condensation of water vapor in vertical tubular heat exchanger, cooled by blast and outer air, it is cleaned condensate against acid components in anion-exchange filter with receiving of solution NaNO3, cleaned against nitric oxide smoke fumes are delivered against carbon monoxide by absorption by solution of monoethanolamine (MEA) in saturator and it is separated from removed drops in entrainment separator, carbonised solution of MEA is heated by means of heat of smoke fumes up to saturation temperature at excessive pressure, it is throttled up to atmospheric pressure and is directed into middle part of decarbonifier, where carbonised solution of MEA is separated for volatile cut, which as a result of condensation in vapor condenser, cooled by feedwater, is divided for condensate of MEA and volatile acid, which is by means of blower partly fed into absorbing tower, where it is mixed to sprayed caustic soda solution with formation of sodium carbonate Na2CO3 and partly - in pure form for realisation to consumers, and decarbonated solution of MEA, which is removed from decarbonifier cube, heated by direct steam, is mixed to condensate from vapor condenser and by recycling pump is again fed to absorption. Device for cleaning includes smoke flue 1, vertical tube heat exchanger 3, saturator 5 with located in its top part liquid dispergator 6, connected by bottom through the first recycling pump 8 to decarbonifier 10. Smoke flue 1 is connected sequentially to heater of solution of monoethanolamine (MEA) 2 and to vertical tube heat exchanger 3, consisting of connected sequentially by gas downright tube air preheater and condenser, agreeably, the latter of which is connected by condensate to anion-exchange filter 4, and by gas - to saturator 5, in top part of which it is additionally located entrainment separator 7, herewith into connection line of bottom of saturator to decarbonifier there are included specified preheater of solution of MEA 2 and additionally - throttle 9, and inside the decarbonifier there are placed top and bottom liquid dispensers 11 and, agreeably, sections, filled by capping 12, herewith top of decarbonifier 10 is connected by pipeline to vapor condenser 13, connected, in turn, through condensate tank 14 and hydraulic hitch 15 with top liquid dispenser 11 of decarbonifier, and by CO2 vapor condenser 13 is connected to blower 16 and absorbing tower 17, upwardly of which it is located liquid disperser 18, herewith bottom liquid dispenser 11 of decarbonifier 10 is connected to throttle 9, and bottom of decarbonifier 10 through pipeline and the second circulating pump 19 is connected to hydraulic hitch 15 of vapor condenser 13 and liquid dispenser 6 of saturator 5.
EFFECT: increasing ecological and cost-effectiveness of cleaning process of smoke fumes from heat-and-power installations against harmful impurities and carbon dioxide.
2 cl, 1 dwg
