A system for removing dioxin from garbage fly ash and its treatment method

Abstract

The invention provides a system for removing dioxin from garbage fly ash. The system comprises a pyrolyzing furnace, a positive-pressure pneumatic conveyor, a dioxin removal device, a bag-type dust collector and a water cooling device, wherein a feeding port a of the positive-pressure pneumatic conveyor communicates with a discharging port b of the pyrolyzing furnace, a discharging port a of the positive-pressure pneumatic conveyor communicates with a feeding port c of the dioxin removal device, a discharging port c of the dioxin removal device communicates with the bag-type dust collector, and the water cooling device is connected with the positive-pressure pneumatic conveyor and the dioxin removal device through water pipes. A corresponding treatment method is further disclosed. The pyrolyzing furnace, the dioxin removal device and the positive-pressure pneumatic conveyor are arranged, so that dioxin and other harmful substance molecules are subjected to solid-phase dehalogenation and decomposition, and the dioxin removal device is used in combination to adsorb residual dioxin in tail gas and dry ash substances generated by high-temperature pyrolysis, so that the fly ash meets the harmless disposal requirement of the garbage fly ash.

Description

technical field [0001] The invention relates to the technical field of harmless treatment of garbage fly ash, in particular to a garbage fly ash dioxin removal system and a treatment method thereof. Background technique [0002] With the acceleration of urbanization and the improvement of people's living standards, the amount of domestic garbage has increased significantly, and the harmless treatment of garbage has become an inevitable choice. At present, one of the domestic garbage disposal methods is landfill, which has been denied in most areas due to environmental pollution. One is to use waste incineration, and the fly ash produced by it is processed as follows: one is to add a chelating agent to the fly ash for solidification and landfill, and the other is to use activated carbon to absorb harmful substances in the fly ash and then use it industrially , such as brick making, pottery making, etc. The current waste incineration technology and process itself have enviro...

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned technical solution discloses the high-temperature pyrolysis gasification treatment of domestic garbage, and the exhaust gas purification treatment uses activated carbon adsorption, the existing activated carbon adsorption only sprays activated carbon on the flue gas, the contact time is short, it is difficult to fully react, and the amount of activated carbon used larger

The dry ash after garbage incineration needs to meet the discharge standard of dioxin content < 20ng-TEQ / kg, which needs to be solved in the high-temperature pyrolysis and gasification treatment of garbage. It is not clearly recorded in this invention. Therefore, this invention Did not overcome the problem of dioxin purification treatment in the high-temperature pyrolysis gasification treatment of garbage

[0005] In addition, the invention does not carry out anaerobic treatment on the flue gas. Before the subsequent cooling process, it is difficult to avoid the regeneration of dioxins, which increases the treatment pressure of the activated carbon absorber, and it is prone to incomplete treatment of dioxins, and the emission of flue gas is not up to standard.

Images