Catalytic cracking flue gas desulfurization and dust removal process and desulfurization and dust removal device

Abstract

The invention discloses a catalytic cracking flue gas desulfurization and dust removal process. Catalytic cracking flue gas is subjected to three technical processes of flue gas dust removal and primary desulfurization, flue gas desulfurization and flue gas degassing and glue melting in sequence; the catalytic cracking flue gas is purified and washed by a power wave device; the flue gas is subjected to spraying and washing, and mechanical demisting in an absorption tower, so that wet-process desulfurization and dehumidification are realized; and finally, mist drops are captured by an electric demisting method through high-voltage discharging, so that the dust content in the flue gas is less than or equal to 30mg / Nm<3> and the flue gas emission standard is realized. According to the catalytic cracking flue gas desulfurization and dust removal process, a sodium-alkali-process desulfurization method is used for removing sulfur dioxide in the catalytic cracking flue gas of an oil refinery and high-concentration catalyst dust carried by the flue gas; the requirements that the fluctuation of the temperature and the dust content of the catalytic cracking flue gas of the oil refinery is great, and the operation of a desulfurization device is absolutely reliable are met; and meanwhile, an operation process of the gas desulfurization and dust removal device avoids secondary aerosol pollution and corrosion of conventional wet-process desulfurization flue gas, and the safety operation of a main oil refining device is guaranteed.

Description

technical field [0001] The invention relates to a flue gas treatment process and device, in particular to a flue gas desulfurization and dust removal process and its device, which are applied in the technical fields of petrochemical, chemical and environmental protection. Background technique [0002] Before this century, my country's oil refineries mainly processed low-sulfur crude oil. The amount of SOx discharged from the catalytic cracking unit was not large, and the environmental protection requirements were not strict. The catalytic cracking of my country's oil refineries did not have flue gas desulfurization facilities. As my country's demand for oil products increases, during the "Ninth Five-Year Plan" period, coastal refineries along the river began to process imported high-sulfur crude oil, especially sour crude oil from the Middle East. With the development of heavy oil catalytic technology, the processed raw materials are getting heavier and heavier, the sulfur c...

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Problems solved by technology

[0005] Since 2007, domestic refineries have adopted BELCO technology from the United States, and successively built dozens of sets of catalytic cracking flue gas desulfurization units, but the price is high, and the investment amount is ~3 times that of the corresponding domestic wet flue gas desulfurization. Other tower internals keep maintenance costs high

Conventional conventional wet desulfurization flue gas has secondary aerosol pollution and corrosion, which affects the safe operation of the main refinery equipment. Flue gas desulfurization and dust removal with large temperature fluctuations and high dust content of catalytic cracking in refineries have become technical problems to be solved urgently

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