Emission reduction system of sintered fume nitric oxide with low energy consumption and method thereof

Abstract

The invention relates to an emission reduction system of sintered fume nitric oxide with low energy consumption and a method thereof. The system comprises a nitric oxide high-concentration region air bellow A, a nitric oxide low-concentration region air bellow B, a denitration dust remover, a denitration device, a dust remover, a desulfuration device, a main exhaust fan, an emission chimney and a circulation loop. The denitration dust remover is connected with the air bellow A to collect the fume in the air bellow; the denitration dust remover is sequentially connected with the denitration device and the desulfuration device; and the fume subjected to dust removal and denitration is guided into the desulfuration device. The dust remover is connected with the nitric oxide low-concentration region air bellow B to collect the fume; the dust remover is connected with the desulfuration device; and the fume subjected to dust removal is guided into the desulfuration device. The desulfuration device is sequentially connected with the main exhaust fan and the emission chimney so as to desulfur the fume and discharge into the atmosphere. The circulation loop at least comprises a circulation fume hood, a circulation blower, a circulation fume dust remover and a circulation pipeline. The method comprises the following steps of collecting fume, removing dust, denitrating, desulfuring, discharging fume into the atmosphere and the like. The whole system is relatively simple and has obvious effects of energy saving and emission reduction.

Description

technical field [0001] The invention relates to a process for reducing emission of nitrogen oxides in sintering flue gas in the field of iron and steel metallurgy, in particular to a system and method for reducing emission of nitrogen oxides in sintering flue gas with low energy consumption in the field of iron and steel metallurgy. Background technique [0002] Sintering production is an important process unit of steel production. A variety of air pollutants are produced during the sintering production process, such as particulate matter, nitrogen oxides, sulfur dioxide, carbon monoxide, hydrogen chloride, hydrogen fluoride, alkali metals, various heavy metals and dioxins. Various organic matter etc. Sintering is the largest source of nitrogen oxide emissions in iron and steel complexes, accounting for about 60% of the total emissions of the whole plant (excluding self-owned power plants), and the concentration range is generally 150-700mg / Nm 3 , the average concentration ...

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Problems solved by technology

The amount of flue gas produced by the sintering machine is large, but the NOx concentration in the flue gas of each bellows is quite different. The total average concentration is much lower than that of the coal-fired boiler flue gas in the power plant, which is not conducive to improving the removal of nitrogen oxides. Efficiency; if the whole flue gas is denitrified, not only the total removal efficiency is low, but also the operating cost will be astonishingly high

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