Fume denitration device for aluminum oxide suspension calcinator and use method thereof

Abstract

The invention discloses a fume denitration device for an aluminum oxide suspension calcinator and a use method of the fume denitration device. The denitration device comprises a calcining main furnace, one side of the calcining main furnace is connected onto a cooling cyclone separator, the other side of the calcining main furnace is connected onto a roasting auxiliary furnace, hot air exhausted from the cooling cyclone separator is divided and enters a first branch pipe and a second branch pipe, the first branch pipe is connected to the bottom of the calcining main furnace, the tail end of the second branch pipe is connected with an air nozzle, the air nozzle is arranged in the middle of the calcining main furnace, the second branch pipe is provided with a louver electric valve, an atomizing nozzle is arranged above the air nozzle and is connected with a compressed air pipe and a liquid adding pipe to allow a chemical solution to be added in the calcining main furnace and react in the calcining main furnace, the rear end of the calcining auxiliary furnace is connected with a preheating cyclone separator, an air outlet pipe of the preheating cyclone separator is connected with a reactor, and the reactor is filled with a catalyst to denitrate the high-temperature flue containing ammonia gas in the reactor. The denitration device is high in denitration efficiency, the content of NOx in the flue exhausted in the atmosphere is greatly reduced, the heat consumed by aluminum oxide is reduced, and the cost is reduced.

Description

technical field [0001] The invention belongs to the fields of alumina industrial technology and environmental engineering, and in particular relates to a flue gas denitrification device of an alumina suspension roasting furnace and a use method thereof. Background technique [0002] In the alumina preparation industry, the heat source required for aluminum hydroxide in the roasting process is provided by fuel combustion. When the fuel is burned, the N in the fuel 2 and N in air 2 Oxidation at high temperature produces NOx, NOx mainly refers to NO, NO 2 and N 2 o 3 and other nitrogen oxides. The danger of NOx is not only that it is an acid gas, but also that NO can significantly destroy the ozone layer, NO and NO 2 At the same time, it is also a greenhouse gas. NO and hydrocarbons react under the action of sunlight to cause photochemical pollution, which is toxic to the human body. [0003] The NOx content in the flue gas produced by the current roaster is 300-400mg / Nm ...

AI Technical Summary

Problems solved by technology

The danger of NOx is not only that it is an acid gas, but also that NO can significantly destroy the ozone layer, NO and NO 2 At the same time, it is also a greenhouse gas. NO and hydrocarbons react under the action of sunlight to cause photochemical pollution, which is toxic to the human body.

Images