Efficient and energy-saving gas-liquid coupling oxidation desulfurization and denitrification device

Abstract

The invention discloses an efficient and energy-saving gas-liquid coupling oxidation desulfurization and denitrification device which comprises an absorption tower. A flue gas inlet is formed in the lower portion of the absorption tower, the absorption tower is internally provided with a demisting section, an absorption section, an oxidation section and a concentration section from top to bottom, the demisting section comprises a primary demister arranged on the upper portion of the absorption tower, a water washing layer is arranged below the primary demister, the absorption section comprises absorption layers located below the water washing layer, the concentration section comprises a concentration spray layer arranged above the flue gas inlet and a concentration tank located at the tower bottom of the absorption tower, the oxidation section comprises an oxidation tank, ozone is introduced into the oxidation section, the oxidation tank is arranged between the absorption layer and the concentration spray layer and connected with the concentration spray layer, a hydrogen peroxide solution introducing pipe is arranged on the portion, located above the oxidation tank, of a desulfurization tower oxidation section, the demisting section comprises an absorption tank communicated with the tower top of the absorption tower, the absorption tank is arranged on one side of the absorption tower, a flue gas outlet is formed in the absorption tank, and the flue gas outlet is internally provided with a secondary demister. The efficient and energy-saving gas-liquid coupling oxidation desulfurization and denitrification device has the advantages of improving the adsorption efficiency and saving energy.

Description

technical field [0001] The invention relates to an ammonia method desulfurization and denitrification device for coal-fired flue gas, in particular to a high-efficiency and energy-saving gas-liquid coupling oxidation desulfurization and denitrification device, which belongs to the technical field of environmental protection for controlling the discharge of coal-burning pollutants. Background technique [0002] SO produced in coal-fired flue gas 2 , NO x Pollutants such as pollutants have great harm to the atmospheric environment, ecology and human health. As environmental protection requirements become more and more stringent, SO 2 and NO x Emission reduction controls are also being gradually strengthened. [0003] There are many processes applied to flue gas desulfurization. The wet desulfurization process is the most widely used desulfurization method at present. As a kind of wet desulfurization process, the ammonia desulfurization process uses ammonia or ammonium sulfi...

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Problems solved by technology

[0004] However, there are still some problems in ammonia desulfurization at present: the circulating fluid contains 2 Ammonium sulfite with absorption function also contains a large amount of ammonium sulfate, which causes a large amount of energy consumption and waste of circulating fluid pump power; the consumption of ammonia absorbent is large and there is a problem of ammonia escape; the outlet flue gas is easy to carry small droplets and aerosol, it is difficult to remove completely; the quality of the by-product ammonium sulfate is not high, the overall equipment investment and operating costs are relatively high, etc.

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