The dust contained in the boiler flue gas (including fly ash and carbon black), sulfur and nitrogen oxides are all pollutants that pollute the atmosphere. When not purified, the emission index can reach several times to several tens of times the environmental protection regulations. Measures to control the discharge of these substances include pre-combustion treatment, improved combustion technology, dust removal, desulfurization and denitrification. The use of high chimneys only reduces the concentration of pollutants in the atmosphere near the chimney.
The forces used in flue gas dedusting include gravity, centrifugal force, inertial force adhesion, and sound waves and static electricity. Gravity sedimentation and inertial force separation are generally adopted for coarse particles. At higher capacity, centrifugal dust separation electrostatic precipitator and bag filter are often used to have high dust removal efficiency. The water film of the water droplets in the wet and Wen's-water film dust collector can adhere to the fly ash, and the dust removal efficiency is high, and the gaseous pollutants can be absorbed.
Since the 1950s, people have worked hard to develop comprehensive utilization of ash and smelt for profit. For example, ash is used to make building materials such as cement, brick and concrete aggregates. In the 1970s, hollow microbeads were extracted from fly ash as materials for refractory insulation.
The future development of the boiler will further improve the thermal efficiency of the boiler and power station; reduce the equipment cost per unit of power of the boiler and power station; improve the operational flexibility and automation level of the boiler unit; develop more boiler types to adapt to different fuels; Operational reliability of auxiliary equipment; reducing environmental pollution.
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