Roast tail gas treatment method in production of catalytic cracking catalyst

Abstract

The invention mainly relates to a roast tail gas treatment method in the production of the catalytic cracking catalyst. The method comprises the following steps: the roast tail gas is used as a part of the heat source of a drying tower to be introduced in the tower; after the heat exchange, the roast tail gas enters a cyclone separator with the dry tail gas; and the separated gas phase enters a tail gas treatment system for treatment. In the method of the invention, the roast tail gas with a lot of heat which is generated in the roasting process of the catalytic cracking catalyst is directly introduced in the existing catalyst spray drying system for heat recovery, thus the heat recovery rate is high; and the roast tail gas and the dry tail gas of the catalyst spray drying system are treated together, thus the process is simplified and the aims of energy-saving, consumption-reducing, less sewage discharge and investment-saving are achieved.

Description

technical field [0001] The invention belongs to the technical field of catalytic cracking catalyst preparation technology, and mainly relates to the treatment process of roasting tail gas in the catalytic cracking catalyst production process. Background technique [0002] For details on the roasting process in the production of traditional catalytic cracking catalysts, see figure 2 . The flue gas generated by the combustion of gas in the roaster enters the heat exchanger to exchange heat with the cold air and then is discharged into the atmosphere. The heated hot air is sent to the roaster as combustion-supporting air through the blower for heat recovery to achieve the purpose of energy saving. The exhaust gas generated after the catalytic cracking catalyst is roasted is separated from the gas and solid by the cyclone, and the gas phase enters the saturator, and is quenched with cooling water. Into the neutralization settling tank, the gas phase is discharged into the atmo...

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Problems solved by technology

The main problems of this process flow are: (1) Although the flue gas passes through the heat exchanger to recover heat, the efficiency is low, and the flue gas carrying a large amount of heat is directly discharged, and the waste gas generated after the catalytic cracking catalyst is roasted does not return the heat. (2) In the process of treating the exhaust gas generated by catalyst roasting, a large amount of cooling water is required for rapid cooling, resulting in high waste discharge and high energy consumption; (3) In order to overcome the corrosiveness of HCl in the exhaust gas, saturated Hastelloy C-276 material is used for the quenching part of the device, which has good corrosion resistance to low-temperature and medium-temperature hydrochloric acid, and the induced draft fan requires particularly strong resistance to pitting corrosion, acid corrosion, and stress corrosion. Chloride is made of titanium alloy material with excellent corrosion resistance, which is expensive and has high investment cost

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