Sintering flue gas circulation and total pollutant integrated treatment device

Abstract

The invention provides a sintering flue gas circulation and total full-pollutant integrated treatment device which is used for treating sintering flue gas exhausted by a sintering machine and comprises a sintering flue gas circulation system and an exhausted flue gas purification system. The sintering flue gas circulation system comprises a gas-gas heat exchanger, a built-in combustion furnace anda dust removal and denitration integrated device; the second path of flue gas passes through the built-in combustion furnace after being heated by the gas-gas heat exchanger, and enters the dust removal and denitration integrated device to be subjected to secondary denitration and tertiary denitration after being subjected to primary denitration at the built-in combustion furnace; the second pathof flue gas is discharged by the dust removal and denitration integrated device and then enters the sintering machine along the circulating flue to participate in the sintering process again; a discharged flue gas purification system comprises the desulfurization and dust removal integrated device; the first path of flue gas and the third path of flue gas subjected to heat exchange and cooling bythe gas-gas heat exchanger are converged into one path of mixed flue gas, and the mixed flue gas enters the desulfurization and dust removal integrated device for desulfurization and dust removal treatment and then is discharged from a discharge flue.

Description

technical field [0001] The invention relates to the field of ultra-low emission treatment of flue gas in the iron and steel industry, in particular to an integrated treatment device for sintering flue gas circulation combined with all pollutants. Background technique [0002] The iron and steel industry is a high-pollution industry. The iron ore sintering process itself produces a large amount of flue gas. In addition, due to the high air leakage rate of domestic sintering machines (over 40%), a considerable part of the air does not pass through the sintering material layer and directly enters the subsequent flue gas treatment. device, so the amount of sintering flue gas is huge. For example, a 360m 2 When the sintering machine is in normal production, the amount of flue gas emitted is as high as 2.16 million cubic meters per hour (m 3 / h) above. In addition to the large amount of sintering flue gas, it also has the advantages of concentrated emission sources, large fluct...

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Problems solved by technology

[0004] The integrated technology of activated coke desulfurization and denitrification mainly has huge investment, which is difficult for ordinary enterprises to bear, large loss of active coke, high operating cost, complex process, large pressure drop of flue gas passing through the adsorption bed, which increases energy consumption, pipeline blockage caused by injection of ammonia, Disadvantages such as slow desulfurization rate

In the project, the integration of flue gas desulfurization, dust removal and denitrification often directly adopts the series mode of "desulfurization + dust removal + denitrification", which does not realize the real integrated technology of desulfurization, dust removal and denitrification, nor does it really reduce project investment and operating costs, and covers an area of Large, long construction period, causing a lot of pressure on the enterprise

[0005] With the continuous promulgation of national and local standards such as "Emission Standards of Air Pollutants for Iron and Steel Sintering and Pelletizing Industry" (GB 28662-2012), the emission limits of flue gas pollutants in the iron and steel industry are getting lower and lower, and terminal desulfurization / denitrification Treatment technology can only reach the emission limit by continuously increasing the scale of the device and increasing the amount of desulfurizer, ammonia, catalyst, etc., which will inevitably cause great pressure on the enterprise

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