High-temperature and high-dust SCR denitrification apparatus for cement kiln

Abstract

The invention discloses a high-temperature and high-dust SCR denitrification apparatus for a cement kiln. The apparatus comprises a reaction assembly and an ammonia spraying assembly, wherein the ammonia spraying assembly is fixedly installed on the reaction assembly, an ammonia gas delivery pipe is connected with an ammonia inlet, ammonia gas overflows into connecting pipes through through-holes,the connecting pipes, connecting plates and ammonia storage tanks form an ammonia circulation pipeline, and ammonia gas enters nozzles through the circulation pipeline and overflows into a reaction container body to react with flue gas. A power output end of a motor drives a rotation cover to rotate, a rotating process of the connecting pipes is realized, and the connecting pipes drive the connecting plates, the ammonia storage tanks and ammonia conveying pipes to move together, so that overflow points of ammonia gas are constantly changed inside the reaction container body, and the arrangement of rubber rings has no effects on the moving process of the ammonia conveying pipes, and can ensure the airtightness of the reaction container body to the greatest extent, so that the flue gas inside the reaction container body can fully react with ammonia gas, the uneven reaction between the flue gas and ammonia gas is avoided, and the denitrification reaction efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a high-temperature and high-dust SCR denitration device for a cement kiln. Background technique [0002] SCR denitrification is a selective catalytic reduction technology, which has been developed rapidly in recent years. 3 Priority and NO X The reduction and removal reaction occurs to produce nitrogen and water, but does not carry out oxidation reaction with the oxygen in the flue gas. In the absence of a catalyst, the above chemical reaction is only carried out in a narrow temperature range. When the catalyst is used, the reaction temperature can be adjusted. The control is carried out at 300-400°C, which is equivalent to the flue gas temperature between the boiler economizer and the air preheater. The above reaction is an exothermic reaction. Due to NO X The concentration in the flue gas is low, so the temperature increase of the catalyst caused by the reaction c...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a high-temperature and high-dust SCR denitrification device for cement kiln. The rotation process of the connecting pipe is realized through the rotation of the motor, and the connecting pipe drives the connecting plate, the ammonia storage tank and the ammonia delivery pipe to move together, so that the overflow point of ammonia gas The interior of the reaction vessel is constantly changing, the flue gas inside the reaction vessel can fully react with ammonia, avoid uneven reaction between flue gas and ammonia, and improve the efficiency of denitrification reaction. The rubber ring can cover the surface of the ammonia delivery pipe, It does not affect the moving process of the ammonia delivery pipe, but also ensures the airtightness of the reaction vessel to the greatest extent, prevents the ammonia gas from overflowing from the reaction vessel or reduces the ammonia gas overflowing from the reaction vessel, and has higher practicability. In order to solve the problem that the injection point of ammonia gas proposed in the above-mentioned background technology is fixed, it is easy to cause the flue gas near the injection point to react first, and the flue gas far away from the injection point to react slowly or not to react during the reaction process, resulting in The flue gas reaction inside the SCR denitrification device is uneven, the denitrification reaction efficiency is low, and the mobile ammonia gas injection point has poor air tightness and poor practicability.

Images