Sintering smoke self-catalyzing denitrifying system by coupling and utilizing residual heat of sintering smoke

Abstract

The invention relates to a sintering smoke self-catalyzing denitrifying system by coupling and utilizing residual heat of sintering smoke, which solves the problems of large investment, high running cost and lower denitrifying efficiency in the existing denitrifying system. The sintering smoke self-catalyzing denitrifying system adopts the technical scheme that the sintering smoke 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; the main flue is sequentially connected with a denitrifying reactor of a fluidized bed through a denitrifying flue gas heat exchanger shell or tube, and a flue gas heater; liquid ammonia spray nozzles are respectively arranged in the air bellows under the machine tail section to the flue gas quick heating section area, and in the flue gas exit pipeline of the flue gas heater. The sintering smoke self-catalyzing denitrifying system has the advantages that the system is simple, the additional purchase of the catalyst is avoided, the effective denitrifying and sintering process is realized, the recycling rate of residual heat is high, the energy-saving and consumption-reducing effects are realized, 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 process in the field of environmental protection, in particular to a sintering fume autocatalytic denitrification system which couples and utilizes the waste heat of sintering fume. Background technique [0002] Sintering flue gas is a gas containing a variety of polluting components produced during the ignition, melting, and high-temperature sintering of various powdery iron-containing raw materials, fuels, and fluxes. The sintering flue gas has a large amount of flue gas (4000-6000m 3 / ton of sinter), large temperature changes (120-200°C), high CO concentration (0.5-2.0%), SO 2 Concentration changes greatly (1000-3000mg / Nm 3 ), NO x Low concentration (300-500mg / Nm 3 ), high moisture content (7-12%) and high oxygen content (15-18%). Compared with power plant flue gas, it has many characteristics of its own, its flue gas composition is more complex, its changes fluctuate more, and its treatment ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the above-mentioned technical problems, aiming at the existing problems such as complex sintering flue gas denitration system, long process route, large investment, high operating cost, and difficult disposal of waste catalysts, etc., to provide a simple system that does not need to purchase catalysts to realize Sintering soot autocatalytic denitrification system with effective denitrification, high waste heat recovery rate, energy saving, small footprint, low equipment investment and operating costs

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