Denitration treatment system and method for pellet roasting flue gas of grate rotary kiln

Abstract

The invention discloses a denitration treatment system and method for pellet roasting flue gas of a grate rotary kiln, belongs to the technical field of waste gas treatment, and can be used for carrying out desulfurization and denitration treatment on flue gas generated during pellet production, when the flue gas enters a denitration reactor, dust particles in the flue gas can be intercepted by through holes in a filter plate, and the dust particles in the flue gas can be prevented from entering the denitration reactor. The catalytic plate is prevented from being blocked during use, the using effect of the catalytic plate is improved, the service life of the catalytic plate is prolonged, when the through holes are blocked, the pressure sensing film is stressed, the lifting plate can be driven to ascend under the action of a driving rope and other devices, the filter plate is shifted under the action of the shifting rod, the filter plate rebounds, and when the filter plate rebounds, the catalytic plate is prevented from being blocked. The dust particles in the through holes are vibrated off through inertia, the through holes can continuously filter smoke, the service life of the through holes is prolonged, and when the filter plate rebounds, the collision balls can smash the dust particles in the through holes, so that the cleaning effect of the through holes is further enhanced.

Description

technical field [0001] The invention relates to the technical field of waste gas treatment, and more specifically relates to a denitrification treatment system and treatment method for flue gas from pellet roasting in a grate rotary kiln. Background technique [0002] Pelletizing is one of the important methods of powder ore agglomeration. First, powder ore is added with appropriate amount of water and binder to make green balls with uniform viscosity and sufficient strength. After drying and preheating, they are roasted in an oxidizing atmosphere to make The raw pellets are agglomerated to make pellets. [0003] Grate rotary kiln is the leading process of oxidation pellets in China. Grate rotary kiln pellet production is divided into four process sections: batching, pelletizing, roasting and cooling. The rotary kiln can roast pellets. The rotary kiln is in production When the flue gas is produced, the flue gas contains nitrogen oxides. If the flue gas is discharged directl...

AI Technical Summary

Problems solved by technology

[0004] Selective catalytic reduction (SCR) denitration technology has the advantages of mature technology, high denitrification efficiency (up to 90%) and good economy, so it is widely used in coal-fired power stations. The main principle of selective catalytic reduction (SCR) denitrification technology is that ammonia is in the Under the action of the catalyst, the NOX in the flue gas is reduced to non-polluting N 2 and H 2 O, the catalyst mainly exists in the form of a multi-diameter plate. During use, the flue gas may contain dust particles with large particle size and hardness, which often cause catalyst wear and blockage, reduce the service life of the catalyst, and denitrify Efficiency drops, affecting the normal operation of downstream equipment

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