Novel DCC device waste heat boiler

Abstract

The invention discloses a novel DCC device waste heat boiler which comprises a flue and a steam pocket. The structure of the flue comprises a first flue and a second flue, wherein a connecting flue communicates with the top of the first flue and the top of the second flue, the lower end of the first flue communicates with an inlet flue, and the lower end of the second flue communicates with an outlet flue. Superheaters, a first evaporator and an ammonia spraying device are sequentially arranged in the first flue from bottom to top, a main bypass flue communicates with the inlet flue, and a first bypass flue with a first adjusting device communicates with the portion, located between the superheaters and the first evaporator, of the first flue. A second bypass flue with a second adjusting device communicates with the portion, located between the first evaporator and the ammonia spraying device, of the first flue, and the first bypass flue and the second bypass flue are communicate with the main bypass flue. Denitration devices, second evaporators and coal economizers are sequentially arranged in the second flue from top to bottom. By means of the structure, the denitration rate of the catalyst SCR can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of boilers, in particular to a novel waste heat boiler of a DCC device. Background technique [0002] Catalytic cracking is one of the main methods of petroleum secondary processing, and it plays a very important role in the deep processing of crude oil, especially in the conversion of heavy oil. At present, about 50% of domestic heavy oil is processed through catalytic cracking units, and more than 80% of finished gasoline is catalytic cracking gasoline components. Catalytic cracking plays a vital role in promoting my country's oil refining industry. [0003] The catalytic cracking unit will emit a large amount of high-temperature flue gas during the catalytic cracking reaction. The high-temperature flue gas contains toxic gases: carbon monoxide (CO) and nitrogen oxides (NO X ), nitrogen oxides mainly include nitric oxide, nitrogen dioxide and nitric acid fog, nitrogen dioxide is the main source, and nitr...

AI Technical Summary

Problems solved by technology

At present, the common waste heat boiler has defects such as unsatisfactory catalyst SCR denitrification rate during use.

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