Circuit board smelting organic tail gas treatment system

Abstract

The invention discloses a circuit board smelting organic tail gas treatment system which comprises a smelting unit, a waste heat unit, a cooling unit, an activated carbon ejector, a cloth bag dust removal device, a desulfurization absorption tower and a secondary denitration unit, the waste heat unit comprises a waste heat boiler, and the cooling unit comprises a spray cooler and a temperature monitor; the waste heat boiler, the spray cooler, the activated carbon ejector, the cloth bag dust removal device, the desulfurization absorption tower, the heat exchanger and the secondary denitration unit are sequentially communicated in the flowing direction of tail gas generated by the smelting unit, and the tail gas reaching the standard is discharged from a gas outlet of the secondary denitration unit. The temperature of the tail gas at the smelting furnace, the CO concentration at the waste heat boiler and the nitrogen oxide content at the denitration spray gun are monitored and adjusted in real time, and rapid cooling of the spray cooler is matched, so that the dioxin content in the tail gas after circuit board smelting is remarkably reduced, and the treated tail gas meets the emission standard.

Description

technical field [0001] The invention relates to the technical field of resource utilization of solid waste, in particular to a circuit board smelting organic tail gas treatment system. Background technique [0002] Dioxin PCDDs are persistent organic pollutants UPPOP that are not intentionally produced in natural combustion and industrial production. Compounds, including polychlorinated dibenzodioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs), are two types of tricyclic aromatic hydrocarbon compounds, and the number of substitutions of chlorine atoms in the molecular structure is 1 to 8. Dioxins are neither produced nor used by humans, but are usually by-products of combustion and various industrial processes. Dioxin is a class of highly toxic substances, and its toxicity is equivalent to 130 times that of the well-known highly toxic substance cyanide and 900 times that of arsenic; experiments have shown that exposure to environments containing PCDD or PCDF can caus...

AI Technical Summary

Problems solved by technology

Waste circuit boards are hazardous waste. If they are piled up without treatment, they will take up a lot of space, and the harmful substances in them will pollute the soil and cause a great burden on the ecological environment.

The pyromelting treatment of waste circuit boards does not choose raw materials, the process is simple and direct, but it will produce 2 , HCl, SO 2 , NO 2 The smelting flue gas of harmful gases such as dioxins is accompanied by the generation of dioxins, which pollutes the environment and is difficult to deal with

There is no effective treatment method in the prior art to deal with the dioxins produced in the smelting process of waste circuit boards, so a new method needs to be proposed to solve the above problems

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