Flue gas circulation denitrification system based on sintering flue gas autocatalysis

Abstract

The invention relates to a sintering flue gas autocatalysis-based flue gas circulating denitrification system. According to the technical scheme, the system comprises a sintering machine, wherein an air box is arranged at the lower part of a trolley of the sintering machine; an outlet in the bottom of the air box communicates with a flue gas pipe; the sintering machine is sequentially divided into four areas, namely an ignition segment, a machine head segment, a flue gas quick heating segment and a machine tail segment along an advancing direction of the trolley; the outlet of a main flue powder hopper at the lower part of the flue gas pipe connected with the air box in the areas of the machine tail segment and the flue gas quick heating segment is connected with a dust pneumatic conveying pipe; and the outlet of the dust pneumatic conveying pipe is connected to a fluidized bed denitrification reactor through a particle material cabin. The system provided by the invention is simple, high in afterheat recovery rate, small in floor area, friendly to environment, economical in denitrification equipment investment and low in denitrification operation cost, and autocatalytic smoke denitrification is carried out without purchasing a denitrification catalyst.

Description

technical field [0001] The invention relates to a flue gas denitrification system in the field of environmental protection, in particular to a flue gas circulation denitrification system based on sintering flue gas autocatalysis. Background technique [0002] Generally speaking, the waste heat of the main flue gas of the sintering machine accounts for 13-23% of the energy consumption of the sintering process, and the waste heat of the exhaust gas of the cooler (ring cooler or belt cooler) accounts for 19-35% of the energy consumption of the sintering process. And up to 50-60%. At present, many enterprises have recycled the waste heat of the exhaust gas of the cooling machine, but few enterprises have recycled the waste heat of the main flue gas of the sintering machine. [0003] Sintering flue gas circulation is one of the effective schemes for waste heat recovery and utilization of sintering flue gas. The basic process route is to reintroduce part of the sintering heat was...

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Problems solved by technology

[0015] The purpose of the present invention is to solve the above-mentioned technical problems, aiming at the waste of waste heat of sintering flue gas in the existing sintering system, large investment and high cost of flue gas denitration, etc., to provide a simple system, no externally purchased denitrification catalyst, self-catalyzed denitrification by sintering dust, Flue gas circulation denitrification system based on sintering flue gas autocatalysis with high waste heat recovery rate, small footprint, environmental friendliness, low investment in denitrification equipment and low denitrification operation cost

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