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Dust contained in the boiler flue gas (including fly ash and carbon black), sulfur and nitrogen oxides are all substances that pollute the atmosphere, and the emission index of the boiler flue gas can reach several times to several ten times of the environmental protection standard without purification. Measures to control emissions of these substances include pre-combustion, improved combustion techniques, dust removal, desulfurization and denitrification. With high chimney can only reduce the concentration of pollutants in the atmosphere near the chimney.
Flue gas dust used by the force of gravity, centrifugal force, inertial force adhesion and sound waves, static electricity. The coarse particles generally use the gravity sedimentation and inertial force separation, often used at higher capacity centrifugal separation dust electrostatic precipitator and bag filter with high dust removal efficiency. Wet and Venturi - water film dust collector water film can adhere to fly ash, dust removal efficiency is high but also to absorb gaseous pollutants.
Since the 1950s, people have been making every effort to develop the comprehensive utilization of ash and slag and turning harm into profits. Such as the use of ash manufacturing cement, brick and concrete aggregates and other building materials. 70 years and from the fly ash from the hollow beads, as fire-resistant insulation and other materials.
The future development of boilers will further increase the thermal efficiency of boilers and power plants; reduce the unit cost of boilers and power plants; increase the operational flexibility and automation of boilers; develop more boilers to accommodate different fuels; Auxiliary equipment operational reliability; reduce environmental pollution.