Heat exchange method in regenerating process of flue gas desulfurization and denitrification adsorbent
An adsorbent regeneration and adsorbent technology, applied in separation methods, filter regeneration, chemical instruments and methods, etc., can solve the problems of increasing equipment and operating costs, and achieve the effects of saving equipment investment, reducing energy consumption, and simple structure
Active Publication Date: 2012-08-01
CHINA PETROLEUM & CHEM CORP +1
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This method requires an independent heating furnace and fuel combustion, which will increase equipment and operating costs
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[0030] The heat exchange method in the regeneration process of the flue gas desulfurization and denitrification adsorbent provided by the present invention includes introducing the adsorbent into the flue gas adsorber, contacting the flue gas regenerated by the catalytic cracking catalyst, and adsorbing and removing sulfur and nitrogen compounds in the flue gas , the spent adsorbent adsorbed with sulfide and / or nitride is introduced into the adsorbent regenerator, mixed with the high-temperature regenerant from the catalytic cracking regenerator to increase the temperature, and at the same time contact with the reducing gas at a higher temperature Desorption and regeneration, the adsorbent mixture after desorption and regeneration has two destinations: 1) all or part of it is cooled and returned to the flue gas adsorber for recycling, 2) all or part of it is returned to the catalytic cracking catalyst regenerator or the reaction of the catalytic cracking unit In the device; the...
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Abstract
The invention relates to a heat exchange method in the regenerating process of a flue gas desulfurization and denitrification adsorbent, comprising the following steps of: leading the desulfurization and denitrification adsorbent into a flue gas adsorber to contact with a regenerated flue gas of a catalytic cracking catalyst to adsorb and deprive sulfides and nitrides which are contained in the regenerated flue gas; leading the absorbed adsorbent to be generated into an adsorbent regenerator to contact with a heat carrier for heat exchange so as to increase temperature and contact with a reducing gas to carry out desorption and regeneration at higher temperature; totally or partially cooling a mixture of the desorbed and regenerated adsorbent and a regenerated catalyst, and then returningto the flue gas adsorber for cyclic utilization, or directly leading into a regenerator or a reactor of a catalytic cracking device without cooling, wherein the adsorbent is the catalytic cracking catalyst. The heat exchange method combines an external heat extractor of the regenerator of the catalytic cracking device, an adsorbent (to be generated) heat exchanger of a flue gas processing part and the adsorbent regenerator into a whole, thereby reducing the equipment investment and the energy consumption.
Description
technical field [0001] The invention relates to a method for catalytic cracking of hydrocarbon oil, and more specifically relates to a method for desulfurization, denitrification and heat exchange of regenerated flue gas in a catalytic cracking unit. Background technique [0002] The catalytic cracking catalyst is circulated between the reactor and the regenerator. Usually, when leaving the reactor, the catalyst contains about 3-10wt% coke, and the deposited coke must be burned with oxygen in the air in the regenerator to restore catalytic activity. . The coke deposited on the catalyst is mainly a reaction condensate, and its main components are carbon and hydrogen. When the cracking raw material contains sulfur and nitrogen, the coke also contains sulfur and nitrogen. The carbon-deposited catalyst is regenerated with oxygen to generate CO 2 , CO and H 2 O, regeneration flue gas also contains SOx (SO 2 , SO 3 ) and NOx (NO, NO 2 ). The regeneration reaction is an exot...
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IPC IPC(8): B01J20/34B01J8/24
Inventor 郭大为张久顺张执刚毛安国谢朝钢陈昀王巍于敬川
Owner CHINA PETROLEUM & CHEM CORP