Hazardous waste incineration flue gas purification system and process

Abstract

The invention discloses a hazardous waste incineration flue gas purification system and process. The hazardous waste incineration flue gas purification system comprises a rotary kiln, a waste heat boiler, a quench tower, a deacidifying tower, a bag-type dust remover, a low-temperature plasma reaction device and an absorption tower which are sequentially connected, the inlet of the waste heat boiler is provided with an SNCR denitration agent atomization jetting device, the quench tower is internally provided with an emergency cooling spraying device; an activated carbon jetting device and a drypowder jetting device are arranged on the upper part of the deacidification tower, a pre-cooling spraying device is arranged on the flue at the inlet of the absorption tower, a circulating spraying device and a demisting device are arranged in the absorbing tower. According to the method, the removal performance of SO2, NoX, smoke, HCl, HF and dioxin in the dangerous waste incineration flue gas are stable, particularly, the removal of the nitrogen oxides in the flue gas is high in efficiency, the concentration of the nitrogen oxides can be controlled to be 100 mg / Nm3, the operation stabilityis good; the system has the advantages of being simple in structure and low in investment operation cost.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a hazardous waste incineration flue gas purification system and process. Background technique [0002] Hazardous waste refers to waste that is included in the national hazardous waste list or determined to be hazardous according to the national hazardous waste identification standards. At present, incineration has become the main way of hazardous waste disposal. Due to the wide variety and complex nature of hazardous waste, the pollutant components in the flue gas of hazardous waste incineration are complex and fluctuate greatly. Although the "Pollution Control Standards for Hazardous Waste Incineration" (GB18484-2001) stipulates the emission limits of pollutants in the incineration flue gas, the limits for the indicators of smoke, sulfur dioxide, and nitrogen oxides are not high. [0003] With the continuous improvement of people's environmental requirements, the...

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Problems solved by technology

[0004] At present, the flue gas purification technology of hazardous waste incineration is single. Although it meets the emission limit requirements of pollutants in the "Pollution Control Standards for Hazardous Waste Incineration" (GB18484-2001), it cannot meet the increasingly stringent standards and local requirements.

In particular, the removal efficiency of nitrogen oxides in the flue gas is limited, and the emission concentration is 200mg / Nm 3 Compared with the limit value of nitrogen oxides in the currently widely implemented local emission standards for waste incineration (less than 75mg / Nm 3 ) is significantly higher

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