Wet desulphurization system with multi-stage humidification demisting device

Abstract

The invention discloses a wet desulphurization system with a multi-stage humidification demisting device, relates to a purification device of a thermal power plant, and particularly relates to a device for reducing wet desulphurization smoke dust load of a spray-type desulphurization absorption tower. The wet desulphurization system comprises the absorption tower, wherein the absorption tower is internally provided with a spraying layer and a demister; the wet desulphurization system is characterized in that a humidification nozzle is arranged on a position which is behind the demister and far form the demister by 0.3-1.0m, a flue which is behind the humidification nozzle and far from the humidification nozzle by 4-10m is internally provided with a last-stage demister, and a washing nozzle for washing the last-stage demister is in front of the last-stage demister. The wet desulphurization system provided by the invention has the following advantages that 1, the smoke discharge value of a chimney of the thermal power plant is effectively reduced; 2, the energy consumption is low, and the energy-consumption index is superior to that of electric bag dust extraction and wet dust extraction; 3, the investment is relatively small, the investment is 30-50% of the investment of the electric bag dust extraction and is 15-20% of the investment of the wet dust extraction, the maintenance of equipment is convenient, and the service life is long; 4, the construction period is short and can finish within 10-20 days; 5, the operation and the adjustment are easy, and the equipment is safe and reliable.

Description

technical field [0001] The invention relates to a purification device of a thermal power plant, in particular to a device for reducing the dust content of the wet desulfurization flue gas of a spray type desulfurization absorption tower. Background technique [0002] The desulfurization absorption tower uses physical and chemical methods to remove sulfur dioxide (SO 2 ) devices or structures. The main components of pulverized coal boiler dust: silicon dioxide, aluminum oxide, ferric oxide, calcium oxide, magnesium oxide, unburned carbon, etc. The soot contained in the flue gas after the desulfurization of the desulfurization spray absorption tower of the thermal power plant contains part of the dust of coal combustion, and most of the solids are the slurry components in the desulfurization absorption tower. [0003] Wet desulfurization is one of many desulfurization methods. Wet desulfurization uses water as the absorbent carrier in the process of absorption and reaction,...

AI Technical Summary

Problems solved by technology

Although the wet electrostatic precipitator can solve the problem of high dust content in the flue gas of the desulfurization system, the investment cost is extremely high. High, "wet electrostatic precipitator" investment reaches 120-150 yuan / kwh

And the construction period is long. It takes more than 40 days to complete the electric bag dust removal, and more than 80 days to complete the wet electrostatic dust removal. The operation and maintenance costs are also high.

There is basically no space for the implementation of electrostatic precipitator in the completed power plants

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