In-hollow column intercrystalline ammonia process of desulfurization, recovery system and method thereof

Abstract

The invention relates to a crystallization ammonia process desulfurization and recycling system in an empty tower and a method thereof, which belong to the technical field of environment-friendly equipment. The system comprises a sprinkling desulfurizing tower, a hydrocyclone, a centrifuger, and a vibrating fluidized bed dryer. The method comprises the following steps: hot flue gas enters the middle part of the sprinkling desulfurizing tower, reaches the optimal temperature for ammonia process desulphurization after being cooled by process water sprinkling at the inlet of the tower, and then is subjected to absorption by a sprinkling layer, and finally gets rid of most of free water which is removed by a defogger; clean flue gas is directly sent out by a steel chimney on the top of the sprinkling desulfurizing tower; absorption liquid in a stock tank at the lower part of the tower reaches the state of supersaturation after being subjected to circulating absorption a plurality of times, is forced to be oxidized by oxygen in air and flue gas in the bottom of the tower, and finally produces an ammonium sulphate saturated solution containing a certain amount of solid; the ammonium sulphate saturated solution containing a certain amount of solid is further concentrated by a water cyclone; the concentrated solution forms powder through the centrifuger; and after being dried by the drier, ammonium sulphate products with water content of less than 0.3% can be obtained.

Description

technical field [0001] The invention belongs to the technical field of environmental protection equipment, and in particular relates to an empty-tower crystallization desulfurization device and process for removing and recovering sulfur dioxide in flue gas. Background technique [0002] Traditional in-tower crystallization desulfurization technology mainly adopts double-tower structure and single-tower packed tower structure. The main defect of the former is that the double-tower structure has a large equipment cost at one time, resulting in high unit desulfurization cost, because the gas entrains liquid more seriously. It is difficult to achieve the purpose of a large concentration difference between the two towers without adding a wet dust collector. It is necessary to add a wet dust collector, which not only greatly increases the equipment cost, but also increases the pressure drop of the desulfurization system, and also increases power consumption and maintenance costs....

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, and propose a desulfurization and recovery system and method thereof by crystallization ammonia in an empty tower, which successfully solves the problem caused by the high concentration of the circulating slurry and the decrease of the desulfurization rate. , at the same time, the empty tower spray structure is adopted, which fundamentally solves the problem of blockage caused by packing

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