An online autocatalytic denitrification device for sintering dust

Abstract

The invention discloses a sintering smoke online self-catalyzing denitrifying device, which solves the problems of large investment, high running cost and the like in the existing sintering smoke denitrifying system. The sintering smoke online self-catalyzing denitrifying device adopts the technical scheme that the sintering smoke online self-catalyzing denitrifying system comprises a sintering machine, wherein air bellows are arranged under a trolley of the sintering machine; an exit of the bottom part of each air bellow is communicated with a main flue; the sintering machine is sequentially provided with an ignition section, a machine head section, a flue gas quick heating section and a machine tail section along the moving direction of the trolley; liquid ammonia spray nozzles are respectively arranged in the air bellows under the machine tail section to the flue gas quick heating section area. The sintering smoke online self-catalyzing denitrifying system has the advantages that the system is simple, the additional purchase of the catalyst is avoided, the land occupation area is small, and the equipment investment and running cost are low.

Description

technical field [0001] The invention relates to a flue gas denitrification device in the field of environmental protection, in particular to an on-line autocatalytic denitration device for sintering fume. Background technique [0002] In countries with developed steel industry, such as Japan, the United States and Germany, sintering flue gas has undergone desulfurization and denitrification treatment. Domestic sintering flue gas desulfurization has been basically completed in the "Twelfth Five-Year Plan", but the engineering application of denitrification technology has just started. Activated carbon (coke) adsorption and selective catalytic reduction (S-SCR) are two technologies that can be applied in engineering and have actual achievements in sintering flue gas denitrification technology, but the shortcomings of the two processes are obvious. Activated carbon (coke) adsorbs SO 2 , and use NH 3 Reduction of NOx can achieve simultaneous desulfurization, denitrification a...

AI Technical Summary

Problems solved by technology

Explored its mechanism and found that when there is SO in the flue gas 2 When, O 2 can be oxidized to SO 3 , SO 3 Reacting with metal oxides will generate sulfate and ammonium sulfate will adhere to the surface of the catalyst. It is difficult to desorb under low temperature conditions, occupying the active points on the catalyst surface and reducing the activity of the catalyst.

The presence of water can accelerate the poisoning effect of the catalyst. On the one hand, it is due to the water vapor and NH on the surface of the catalyst. 3 The competitive adsorption between NO and NO, on the other hand, may be due to the presence of water vapor that accelerates the deposition of ammonium sulfate on the surface of the catalyst and accelerates the blockage of the catalyst pores, thereby further reducing the activity of the catalyst.

[0005] In order to reduce denitrification energy consumption, the reaction temperature of the low-temperature SCR denitrification catalyst requires its reaction device to be placed before the desulfurization device, so the low-temperature SCR denitrification catalyst's anti-SO 2 The poisoning ability must be an important factor affecting its life, and the anti-SO 2 Poisoning ability is not as good as expected

Images