Flue gas desulfurization and denitration purification recovery system

Abstract

The invention relates to a flue gas desulfurization and denitration purification recovery system, which comprises an oxidation absorption tower, a separation regeneration system and a concentration crystallization drying device, wherein the oxidation absorption tower comprises an oxidation tank, a flue gas inlet, a spraying filler layer, an atomization oxidation layer, a demister and a flue gas outlet. According to the present invention, flue gas enters the oxidation absorption tower from the flue gas inlet to carry out oxidation absorption on nitrogen oxides, sulfur oxides and heavy metals in the flue gas so as to form the absorption liquid, the purified flue gas is subjected to moisture removing through the demister and then is discharged from the flue gas outlet, anions of the absorption liquid are exchanged into the bed layer in the anion exchange equipment of the separation regeneration system, ammonia water is adopted to perform regeneration on the bed layer, the regenerated ammonium salt solution enters the concentration crystallization drying device, and crystallization drying is performed to form the composite ammonium fertilizer; and the nitrogen oxides, the sulfur oxides and the heavy metals in the flue gas can be removed in the integrated manner, such that the problems of ammonia escape and ammonium salt aerosol in the prior art can be avoided, and characteristics of simple equipment and product resource are provided.

Description

technical field [0001] The invention relates to the field of flue gas purification, in particular to a system for purifying and recovering flue gas discharged during coal combustion. Background technique [0002] With the increasing demand for energy due to economic development, the consumption of coal has also increased significantly. However, during the combustion of coal, a large amount of flue gas will be released. If the flue gas containing sulfur dioxide, nitrogen oxides and heavy metals cannot be effectively treated, it will cause serious environmental pollution problems. [0003] The traditional method of industrial flue gas desulfurization and nitrogen removal is to install desulfurization devices (such as limestone gypsum desulfurization) and denitrification equipment (such as SCR devices) at the tail of the kiln to remove sulfur dioxide and nitrogen oxides respectively. Since the desulfurization and denitrification equipment of this treatment method opera...

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Problems solved by technology

Patent CN101053747 proposes a desulfurization and denitrification process of nitrogen oxide pre-oxidation and ammonia absorption, but it needs to consume a large amount of oxidants such as hydrogen peroxide and ozone. At the same time, denitrification still needs to consume ammonia, and the cost is high; patents CN2712446 and CN101934191A respectively propose multi-stage series The common problem faced by these processes is that the generated ammonium sulfite is easy to agglomerate in the tower, and ammonium salt aerosol is formed in the tower, and the aerosol is discharged with the smoke, which increases the consumption of ammonia.

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