Circulating spouting type NOx emission reduction system and working method thereof

Abstract

The invention relates to a circulating spouting type NOx emission reduction system and a working method thereof. The circulating spouting type NOx emission reduction system comprises a rotary kiln, asmoke chamber, a spouting ring, a fuel system, a tertiary air pipe, a reactor, a first material distribution valve, a first cyclone cylinder, a denitration system, a decomposing furnace, a hopper anda second cyclone cylinder. An air inlet of the smoke chamber is connected with an air outlet of the rotary kiln, an air outlet of the reactor is connected to one side of the decomposing furnace and communicated with the interior of the decomposing furnace, and an air inlet of the reactor is connected with an air outlet of the smoke chamber through the spouting ring. An air outlet of the tertiary air pipe is connected to the bottom of the decomposing furnace, a feeding port of the hopper is connected to the lower portion of the air outlet of the tertiary air pipe, and an air inlet of the secondcyclone is connected with an air outlet of the decomposing furnace; The formation of NOX is effectively avoided or reduced so that the emission reduction efficiency of NOX is improved, and the ammonia water consumption of the denitration system is greatly reduced to save the production cost; meanwhile, the problem of serious material accumulation at the bottom of the decomposing furnace is solved, and secondary pollution can be avoided.

Description

technical field

[0001] The invention relates to a circulating spray type NOx emission reduction system and a working method thereof. Background technique

[0002] At present, the problem of environmental pollution is becoming more and more serious, and the requirements for environmental protection indicators in various industries are becoming more and more stringent. Some provinces and cities have taken the lead in proposing ultra-low emission requirements, reducing flue gas NO X Emissions are controlled below 50mg / Nm3.

[0003] Currently, the NO X Emission reduction technologies mainly include: selective non-catalytic reduction (SNCR) technology, selective catalytic reduction (SCR) technology and staged combustion technology.

[0004] Selective non-catalytic reduction (SNCR) technology is to spray the ammonia solution into the appropriate position of the decomposition furnace and preheater through the pump station and the spray gun, and reduce the NO X reduced to N 2 an...

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