Organic amine desulfurizer solution purification, desalination and impurity removal process for removing sulfur dioxide

Abstract

The invention discloses an organic amine desulfurizer solution purification, desalination and impurity removal process for removing sulfur dioxide. The purification, desalination and impurity removalprocess comprises the following steps: A, inputting an organic amine solution to be purified into a stirring type crystallizer, and starting a stirring mechanism; B, adding pure caustic soda and one or a combination of more of refined limestone powder, refined barium carbonate powder, diatomite and activated carbon into the stirring type crystallizer to serve as additives; C, starting a refrigerating unit to cool the solution in the stirring type crystallizer to + 5 DEG C to -5 DEG C, and carrying out heat preservation for 30 min to 80 min; D, opening an angle valve of the stirring type crystallizer, putting the obtained liquid into a centrifuge, and centrifugally spin-drying; and E, collecting the centrifuged mother liquor, pumping the mother liquor into a filter, filtering, and sending the filtered mother liquid into an amine desulfurization system. According to the process, harmful substances and impurities in an organic amine desulfurizer can be rapidly removed, the impurity and salt removal period is short, the treatment capacity is large, the amine liquid loss amount is small, the pure water consumption is small, the alkali liquor utilization rate is high, and the investmentis saved by 40% or above.

Description

technical field [0001] The invention relates to the technical field of flue gas organic amine sulfur dioxide removal technology, in particular to the technical field of organic amine liquid purification, desalination and impurity removal, in particular to an organic amine desulfurizer solution purification, desalination and impurity removal process for removing sulfur dioxide. Background technique [0002] Flue gas from various kilns or reactions often contains SO 2 Direct discharge pollutes the environment or causes economic losses of raw materials. In recent years, organic amine desulfurization has 2 The advantages of full recovery of resources, safety, environmental protection and energy saving, high degree of automation, no secondary pollution, and use of low-pressure saturated steam for desorption have been rapidly popularized and applied. However, the desulfurizer organic amine liquid (mass content of active ingredients: 10% to 30%, mass content of sulfuric acid: 3.0%...

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Problems solved by technology

However, the desulfurizer organic amine liquid (mass content of active ingredients: 10% to 30%, mass content of sulfuric acid: 3.0% to 12%) absorbs and decomposes SO in the smoke 2 During the process, there will be adsorption, absorption, side reactions and other processes to generate a large amount of sulfate, fluoride salt, acid mist, HF, HCl, and enrich a large amount of dust particles, thiosulfate, amine liquid condensation and decomposition products, and simple substances Sulfur, etc.; for example, the oxygen in the flue gas oxidizes the sulfite in the desulfurizer organic amine amine liquid to form sulfate, etc., and a side reaction occurs during the high temperature desorption process, which causes the disproportionation reaction of sulfite or bisulfite to form sulfate , thiosulfate, elemental sulfur, etc., when the harmful substances in the organic amine desulfurizer are rapidly enriched, it will lead to an increase in desulfurization and desorption steam consumption, resulting in the emission of SO 2 Excessive pollution accidents, in severe cases, even lead to serious blockage in the absorption tower, serious corrosion of stainless steel metal materials, and shutdown of the desulfurization system

Domestic organic amine desulfurization encounters the dilemma of organic amine liquid purification, which is becoming an important problem

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