Abstract
The paper first introduces the background and the mechanism of secondary pollution from desulfurization in cement plant. Then, take plant A as an example, using MGGH (media gas-gas heater) to control “white smoke”. MGGH uses heat medium water to heat transfer between the original flue gas and the clean flue gas, without additional heat source, and has obvious economic benefits, which is the inevitable development direction of desulfurization reform of cement kiln system in the future.
Highlights
According to the National Standard GB4915-2013 (Air Pollutant Emission Standard for Cement Industry) of the People’s Republic of China, since July 1, 2015, the SO2 emission limit of new cement kiln production line is 200 mg/m3 in China, and the SO2 emission limit of new cement kiln production line in key areas is 100 mg/m3
Using flue gas desulphurization (FGD) to decrease SO2 emission may cause “white smoke”, which is because the steam in worm flue gas turns to water drops when it meets cold air outside
The refraction and scattering of light by small droplets make the flue gas become gray and white at the chimney exit, which results in visual pollution
Summary
According to the National Standard GB4915-2013 (Air Pollutant Emission Standard for Cement Industry) of the People’s Republic of China, since July 1, 2015, the SO2 emission limit of new cement kiln production line is 200 mg/m3 in China, and the SO2 emission limit of new cement kiln production line in key areas is 100 mg/m3. Using flue gas desulphurization (FGD) to decrease SO2 emission may cause “white smoke”, which is because the steam in worm flue gas turns to water drops when it meets cold air outside. The refraction and scattering of light by small droplets make the flue gas become gray and white at the chimney exit, which results in visual pollution. In addition to condensate water, there are many impurities such as sulfate and dust in small droplets, which cause certain pollution to the environment (Zhang & Yang, 2018)
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