Secondary combustion device used for treating flue gas containing dioxin

Abstract

The invention discloses a secondary combustion device used for treating flue gas containing dioxin. The secondary combustion device comprises a furnace body and injection type combustors, and a furnace cavity is limited in the furnace body. The upper end of the furnace body is provided with a secondary flue gas outlet communicating with the furnace cavity. Trapezoidal protruding ribs are arrangedon the inner circumferential wall faces of the furnace cavity, and the trapezoidal protruding ribs extend spirally in the axial direction of the furnace cavity to form a spiral flow guide groove. A primary flue gas inlet communicating with a primary flue gas outlet of a primary combustion device is formed in the lower portion of the spiral flow guide groove. A combustion sprayer of each injectiontype combustor stretches in the furnace cavity, wherein the combustion sprayer is arranged in the flow guide groove. The combustion sprayer adjacent to the primary flue gas inlet is located on the downstream part, in the extending direction of the spiral flow guide groove, of the primary flue gas inlet, wherein the shortest distance between the combustion sprayer and the primary flue gas inlet islarger than or equal to one time of the caliber of the primary flue gas inlet. According to the secondary combustion device used for treating flue gas containing dioxin in the embodiment, flue gas canbe mixed and burnt sufficiently, the dioxin burning-down rate is higher, decomposing is thorough, and the treatment effect is better.

Description

technical field [0001] The invention relates to the technical field of incineration, in particular to a combustion device for treating flue gas containing dioxins, and more specifically, to a secondary incineration device for treating flue gas containing high concentrations of dioxins. Background technique [0002] Industrial waste and hazardous waste can be disposed of by incineration or pyro-smelting of metal-containing waste. The dioxin concentration in the furnace flue gas produced by incineration is relatively high, and ordinary purification methods cannot meet the requirements of the national emission standards. Therefore, it is necessary to perform secondary combustion treatment on the flue gas to burn most of the dioxin-like substances. In order to ensure that the follow-up purification meets the standard. The combustion equipment or combustion method in the related art has an unsatisfactory treatment effect on the flue gas, and there will still be a lot of dioxins ...

AI Technical Summary

Problems solved by technology

The dioxin concentration in the furnace flue gas produced by incineration is relatively high, and ordinary purification methods cannot meet the requirements of the national emission standards. Therefore, it is necessary to perform secondary combustion treatment on the flue gas to burn most of the dioxin-like substances. To ensure that the follow-up purification meets the standard

The combustion equipment or combustion method in the related art has an unsatisfactory treatment effect on the flue gas, and there will still be a lot of dioxins in the treated flue gas, which cannot effectively make the dioxin-like pollutants meet the current national emission standards or Pollution Control Standard Requirements

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