Dried flue gas treatment system and method

Abstract

The invention discloses a dried flue gas treatment system and method. The dried flue gas treatment system sequentially comprises a dust remover, a first channel of a denitration heat exchanger, an RTOincinerator, a denitration system, a second channel of the denitration heat exchanger, a first channel of a white smoke eliminating heat exchanger, a desulfurizing tower and a wet electric dust remover in the flowing direction of dried flue gas. One end of the second channel of the white smoke eliminating heat exchanger is connected with a white smoke eliminating fan;and the other end of the second channel is connected with an outlet of the wet electric dust collector. The treatment method comprises the following steps: sequentially carrying out cloth bag dust removal, heat exchanger heat exchange, RTO incineration heating, SCR denitration, wet desulphurization, wet electric dust removal and flue gas white elimination on the dried flue gas, and then discharging the flue gas. According tothe invention, particulate matters, VOCS, sulfur oxides and nitrogen oxides in the flue gas can be effectively removed, and ultralow emission of pollutants in the dried flue gas is realized; meanwhile, the waste heat of the dried flue gas can be fully utilized, and the dried flue gas treatment system has the advantages of being low in operation cost, high in automation level, easy to operate and good in purification effect.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment, in particular to a drying flue gas treatment system and method. Background technique [0002] When treating sludge containing copper and lead, since the water content of the sludge is often as high as 50%, it needs to be dried first. The resulting drying flue gas contains a large amount of sulfur dioxide, nitrogen oxides, and particulate matter, which must be dried It can only be discharged after the purification treatment reaches the standard. [0003] Existing flue gas treatment systems generally do not have a denitrification system, and the removal efficiency of sulfur dioxide and particulate matter is also low, and the operating cost is high. Only a small amount of waste heat is recycled, and waste heat resources are seriously wasted; as national emission standards become more and more stringent , the existing flue gas treatment methods are gradually unable to meet the emission ...

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Problems solved by technology

[0003] Existing flue gas treatment systems generally do not have a denitrification system, and the removal efficiency of sulfur dioxide and particulate matter is also low, and the operating cost is high. Only a small amount of waste heat is recycled, and waste heat resources are seriously wasted; as national emission standards become more and more stringent , the existing flue gas treatment methods are gradually unable to meet the emission requirements

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