Process for desulphurizing and dedusting catalytic cracking regenerated smoke

A technology for desulfurization, dust removal, and flue gas regeneration, which is applied in chemical instruments and methods, dispersed particle separation, and separation methods to achieve the effects of high utilization rate, improved purity, and reduced desulfurization costs.

CN101716454AActive Publication Date: 2010-06-02AEROSPACE ENVIRONMENTAL ENG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2010-06-02

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Abstract

The invention relates to a process for desulphurizing and dedusting catalytic cracking regenerated smoke, which comprises the following steps of: (1) leading smoke to enter a desulphurizing tower and leading effluent desulphurized pulp to enter a precipitating tank; (2) leading the precipitated pulp to enter a regenerating tank to finish the regeneration of sodium alkali and generating sediments of NaOH and CaSO3; (3) leading the regenerated pulp to enter a concentrating tank to obtain high-concentration and high-purity alkali liquid and the high-purity CaSO3 sediment; and (4) leading the CaSO3 sediment to perform the processes of acidification, oxidation, crystallization and dehydration to obtain solid gypsum with high purity and low water content. The smoke is in full contact with the alkali liquid by adopting an efficient pneumatic desulphurizing technology, and the desulphurizing efficiency is beyond 98 percent; the dedusting efficiency is high and is beyond 90 percent for micro dust with the grain diameter of 1-5 microns by the method; the utilization ratio of the lime milk pulp is high, and the utilization ratio of Ca(OH)2 is approximately 100 percent; in addition, the invention combines the desulphurizing tower and a chimney and effectively reduces the building cost and the occupation area.
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Description

technical field

[0001] The invention belongs to the technical field of environmental protection, and relates to catalytic cracking flue gas desulfurization and dust removal, in particular to a catalytic cracking regeneration flue gas desulfurization and dust removal process. Background technique

[0002] At present, the flue gas desulfurization of catalytic cracking mostly adopts the sodium-alkali wet flue gas desulfurization process, that is, the NaOH solution is used to absorb the SO in the flue gas. 2 And dust, produce waste liquid containing a lot of smoke, sulfate, sulfite, etc., the concentration is as high as 12%. For some foreign countries that do not lack water resources, these waste liquids are generally discharged directly without treatment; but for my country, due to the lack of water resources and high population density, if these waste liquids are directly discharged without treatment, it will cause serious damage to the surrounding environment. Serious seconda...

Examples

Embodiment Construction

[0023] Below in conjunction with the examples, the present invention is further described, the following examples are illustrative, not limiting, and the protection scope of the present invention cannot be limited by the following examples.

[0024] The present invention is a new process for desulfurization and dust removal of catalytic cracking flue gas. According to the principle of aerodynamics, sodium lye is used to desulfurize and dedust the flue gas, so that the lye and the flue gas are fully contacted to realize high-efficiency desulfurization and dust removal. After the desulfurization slurry is precipitated, the lime emulsion is used for sodium-alkali regeneration to obtain high-purity and high-concentration sodium alkali solution, which is injected into the desulfurization tower for effective recycling, greatly reducing costs; and the regenerated CaSO 3 Solid precipitation is acidified, oxidized, dehydrated and other processes to obtain solid gypsum with high purity a...