Abstract
Based on the fundamentals of heterogeneous nucleation, a method to eliminate sulfuric acid aerosol associated with water recycling in the process of limestone-gypsum desulfurization was investigated. The supersaturated environment was achieved in a heat exchanger. Numerical calculation shows that high temperature drop and relative humidity are conducive to the formation of supersaturated vapor environment, and vapor heterogeneous condensation can improve the removal efficiency of sulfuric acid aerosol. Experimental results indicate that the critical supersaturation degree of the sulfuric acid aerosol is found in inverse proportion to their sizes and the removal efficiency of sulfuric acid aerosol could be increased by about 20%. The theoretical and the actual condensable water mass values have been also studied in detail. The mass of condensed water produced by the experiment system is 0.0440 kg/(Nm3·h) as the temperature drop is 5°С, and the most suitable temperature drop is about 1∼2°С for water scarce area. High temperature and humidity reveal a huge potential to recycling water.
Highlights
Air pollution has drawn human increasing attention all over the world
As the temperature drop increases from 2°C to 10°C, the removal efficiency shifts from 59.4% to 74.2%. is is mainly because the degree of vapor supersaturation, necessary for the nucleation of sulfuric acid aerosol, increases with the decrease of temperature
An approach to remove the sulfur acid aerosol coupling with water saving in the limestone-gypsum desulfurization system was investigated. e required supersaturation environment was achieved by the heat exchanger after the desulfurization
Summary
It has been reported that the pollution from coal combustion in the coal-fired power plant is one of the prime reasons [1,2,3]. In the coal-fired power plant, the emission of NOx, SO2, and dust is under the effective control in the development of pollutant control technology. During the combustion of coal in boilers, most sulfur in coal is oxidized to SO2 while partial SO2 (0.5%∼1.5%) would be oxidized to SO3 at high temperature condition [5]. With the decreasing of flue gas temperature, most SO3 would convert into gaseous H2SO4 at the outlet of air preheat (APH) [8]. When the temperature of flue gas is lower than 200°C and water content is 8% [9], 99% SO3 would convert into gaseous
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