Graded tower internal crystallization ammonia-process desulfurization method

Abstract

The invention discloses a graded tower internal crystallization ammonia-process desulfurization method comprising the following steps: step one, flue gas enters a lower-stage adsorption section of a desulfurization absorption tower from a flue gas inlet, and is subjected to a reaction with an ammonia water solution and an ammonium sulfite solution; step two, the flue gas obtained after the step one continues to flow to the upper part of the desulfurization absorption tower, and enters an upper-stage absorption section; step three, an ammonium hydrogen sulfite solution generated in the step one is subjected to oxidation aeration at the bottom of the desulfurization tower; step four, an ammonium sulfate solution generated from oxidation is sent into a back-end process system from a hydrocyclone feeding plump; step five, a spray washing liquid in the step 2 is supplied to a spray washing layer from a spray washing tank through a circulation spray washing pump; step six, an ammonium sulfate solution accumulated in a concentration circulating tank in the step three flows back to a cooling concentration section of the desulfurization absorption tower through a pipeline; and step seven, thiamine slurry is sent to a thiamine hydrocyclone by the hydrocyclone feeding pump and is treated. The technical problems that a conventional ammonia-process desulphurization technology has bad flue gas purification effect are solved.

Description

technical field [0001] The invention relates to the technical field of ammonia-based flue gas desulfurization, in particular to a hierarchical tower crystallization ammonia-based desulfurization method. Background technique [0002] Industrial boilers typically run on fossil fuels such as coal and oil. Because these fossil fuels generally contain sulfur components, harmful substances such as sulfur dioxide will be produced during the combustion process. Ammonia desulfurization is a new type of desulfurization technology, which uses ammonia liquid ammonia and ammonia water as absorbents. Due to the high activity of ammonia, it can ensure high desulfurization efficiency; the by-product of ammonia desulfurization is ammonium sulfate fertilizer, which has high economic efficiency. Efficiency is a process that meets the requirements of circular economy and sustainable development. [0003] In the traditional tower crystallization ammonia desulfurization, the raw flue gas direct...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a hierarchical tower crystallization ammonia desulfurization method to solve the technical problems such as poor flue gas purification effect of the existing ammonia desulfurization technology, excessive aerosol and ammonia escape indicators, etc.

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