Method and device for removing water vapor, TDS and SO3 in flue gas through wet desulphurization

Abstract

The embodiment of the invention discloses a method and device for removing water vapor, TDS and SO3 in a flue gas through wet desulphurization. The method comprises the steps of arranging an alkaline liquid spraying curtain in a flue gas cooling and purifying device and neutralizing and removing the SO3 in the flue gas; arranging a guide plate behind the alkaline liquid spraying curtain, rotating the flue gas from which the SO3 is removed and further cooling; arranging a cooling tube bundle area behind the guide plate, further cooling the flue gas, separating out condensed water and capturing fine particles in the flue gas; making the condensed water flow into a demister, separating a gas and a liquid in the flue gas and removing TDS; and entering the liquid and the gas into a catch basin in a layering manner, after the gas passes through the baffle wall, further separating out the liquid from the gas, flowing out of the flue gas cooling and purifying device and collecting and recycling the liquid through the catch basin. According to the method and the device, corrosion of the SO3 to the inner wall of a chimney and pollution to an atmospheric environment can be effectively reduced, and particles can be dissolved, so that the method and the device play an important role in current haze treatment.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a method for water vapor, TDS (dissolved particles) and SO in wet desulfurization flue gas 3 removal methods and devices. Background technique [0002] As of the end of March 2017, the total installed capacity of power plants across the country exceeded 1.61 billion kilowatts, and the total installed capacity of thermal power exceeded 1.06 billion kilowatts. In order to meet environmental protection requirements for SO 2 and NOx emission requirements, the proportion of desulfurization and denitrification units to the total installed capacity of thermal power has increased to 99% and 96%. Some coal-fired industrial boilers have also installed or are planning to install wet desulfurization devices to meet increasingly stringent environmental protection requirements. [0003] At present, more than 95% of large and medium-sized coal-fired units have installed wet desu...

AI Technical Summary

Problems solved by technology

With "Ultra Clean Emissions" (SO 2 ≤35mg / Nm3, NOx≤50mg / Nm3, soot ≤10mg / Nm3), the existing technology adopts "increasing the spray layer", "strengthening the circulation of limestone slurry", "installing the flue gas equalizer plate", "Strengthen the sealing around the tower wall to reduce the escape of flue gas", these measures have strengthened the contact between the high-temperature flue gas and the limestone slurry, and as a result, the "water content" of the flue gas at the outlet of the desulfurization tower has been "increased", and it is supersaturated with mist droplets. Flue gas, since the mist eliminator can only remove the mist of wet flue gas, there is still a large amount of water vapor that cannot be removed

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