System and method for modulating flue gas with sulfur trioxide

Abstract

The invention discloses a system and a method for modulating flue gas with sulfur trioxide. The system comprises: a storage tank, a sulfuric acid conveying apparatus, a sulfuric acid pyrolysizing furnace, an air compressor for providing compressed air for the sulfuric acid pyrolysizing furnace, a blower and an air heating apparatus for providing hot air for the sulfuric acid pyrolysizing furnace,and an injector. The injector is connected to the sulfuric acid pyrolysizing furnace, and is arranged in the inlet flue of an electrostatic precipitator (ESP). With the flue gas modulating system andmethod provided by the present invention, sulfuric acid solution can be decomposed into a gas mixture of sulfur trioxide and steam under a high temperature; the gas mixture is then injected to the flue gas with the injector arranged in the inlet flue of the ESP; sulfur trioxide and moisture in the flue gas can be combined to form sulfuric acid aerosol attached to the surfaces of the dust particles; specific resistance of the dust can be reduced, and dedusting efficiency of the ESP can be improved. Compared to traditional technologies for modulating flue gas with sulfur trioxide, the method and the system provided by the present invention has advantages of simple operation, good economic benefit, and high improvement efficiency of the ESP.

Description

technical field [0001] The invention relates to the technical field of chemical equipment, in particular to a sulfur trioxide flue gas conditioning system and method. Background technique [0002] Due to its advantages of high dust removal efficiency, low operating cost, and simple operation and maintenance, electrostatic precipitators are widely used in the exhaust gas treatment of thermal power plants, cement plants, steel plants and other industries all over the world. It can remove the particulate smoke and dust in the exhaust gas of coal-fired or oil-fired boilers, thereby greatly reducing the amount of smoke and dust discharged into the atmosphere. It is an important environmental protection equipment to improve environmental pollution and air quality. [0003] The disadvantage of electrostatic precipitator is that it is easily affected by the physical and chemical characteristics of flue gas and dust, especially the specific resistance of dust. For specific resistanc...

AI Technical Summary

Problems solved by technology

The traditional process has gone through many tedious processes, the process is complicated, and the equipment cost is high. The optimum temperature range for liquid sulfur is between 125°C and 145°C. The viscosity of liquid sulfur in this temperature range is the smallest. Sensitive, so the process is prone to leakage, blockage and other failures

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