Flue gas low-temperature combined desulfurization and denitration technology method

Abstract

The invention discloses a flue gas low-temperature combined desulfurization and denitration technology method mainly including the steps: flue gas after dedusting having a purification temperature and humidity meeting desulfurization conditions is sent into a desulfurization tower to flow through a desulfurization catalyst bed, sulfur dioxide in the flue gas is oxidized into sulfur trioxide under the action of a catalyst, and sulfur trioxide acts with water in the flue gas to generate sulfuric acid; the desulfurization catalyst bed is regenerated through progressively-decreased sulfuric acid concentration gradient washing; the flue gas after desulfurization is sent into a denitration conditioning work section, is dehumidified and heated, and is adjusted to meet requirements of a denitration technology; the flue gas after dehumidification and heating is sent into a mixing tower and is mixed with injected ammonia gas, the mixed flue gas mixed with the ammonia gas is sent into a denitration tower to flow through a denitration catalyst bed, and NOx, NH3 and O2 in the mixed flue gas are converted into N2 and water under the action of a denitration catalyst. The problems that a conventional flue gas desulfurization and denitration technology is narrow in flue gas applicable scope, high in heating energy consumption, high in running cost and the like are overcome.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and in particular relates to a combined desulfurization and denitrification process method for removing sulfur dioxide and nitrogen oxides in flue gas, which is used for purification treatment of industrial flue gas. Background technique [0002] Sulfur dioxide and nitrogen oxides are the main pollutants in the atmosphere, and they are also the focus and difficulty of air pollution control and environmental protection. In recent years, in order to control the emission of sulfur dioxide and nitrogen oxides, many countries in the world have introduced a large number of laws and regulations to control their emissions, and the control of sulfur dioxide and nitrogen oxide emissions has become increasingly strict. [0003] The pollutants sulfur dioxide and nitrogen oxides in the atmosphere mainly come from the flue gas after the combustion of petrochemical substances. So far, flue gas de...

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Problems solved by technology

[0007] Aiming at the deficiencies of flue gas desulfurization and denitrification in the prior art, the present invention aims to provide a new flue gas low-temperature combined desulfurization and denitrification process to overcome the narrow application range of flue gas existing in the existing flue gas desulfurization and denitrification process, or heating High energy consumption and high operating costs

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