Garbage incineration fume ultralow emission purifying system

Abstract

The invention discloses a garbage incineration fume ultralow emission system. A garbage incineration fume purifying treatment device comprises an SNCR (selective non-catalytic reduction) device, a semi-dry type reaction tower, a slaked lime spraying device, an activated carbon spraying device, a bag type deduster, a steam heater, an SCR (selective catalytic reduction) reaction tower, a fume / fume heat exchanger, a wet type scrubbing tower, an induced draft fan and a chimney. The low-temperature fume after washing is performed with heat exchange in the fume / fume heat exchanger, heated, and exhausted out of the chimney. The garbage incineration fume purifying treatment device has the advantage that the emission of the fume is superior to the European Union 2000 standard.

Description

technical field [0001] The invention relates to an ultra-low emission system for waste incineration flue gas. Background technique [0002] Garbage incineration can maximize the reduction, harmlessness and recycling of garbage, but incineration will inevitably bring secondary pollution. The flue gas produced by garbage incineration contains a large number of environmentally harmful substances such as acid gases , nitrogen oxides, dust, dioxins, heavy metals, etc., so it is necessary to thoroughly purify the flue gas generated by waste incineration before it is discharged into the atmosphere, so as to minimize its impact on the surrounding environment. [0003] The emission control of dust generated during waste incineration can be achieved through several methods such as electrostatic separation, filtration, centrifugal sedimentation, and wet washing. Common equipment includes electrostatic precipitators, bag filters, and Venturi scrubbers. Venturi dust collectors have high...

AI Technical Summary

Problems solved by technology

The deacidification efficiency of the three deacidification processes is different: the dry process is simple, low in investment, and easy to operate and maintain, but the deacidification efficiency is relatively low; the semi-dry process has high deacidification efficiency and low investment and operation costs. No waste water is generated; wet deacidification is the most efficient, but subsequent waste water treatment is required

[0005] At present, the flue gas purification system of waste incineration power plants is mainly based on the process of semi-dry deacidification + activated carbon adsorption + bag filter. The process combination is simple and fixed, and the effect on pollutant removal is limited. Under such circumstances, it is difficult to meet the emission requirements of the "EU (2000 / 76 / EC)", and the dust content of the flue gas is less than 10mg / m 3 , nitrogen oxides less than 200mg / m 3 , sulfur dioxide less than 50mg / m 3 , hydrogen chloride is less than 10mg / m 3 , dioxin 0.1ngTEQ / m 3 , especially the emission of nitrogen oxides and acidic substances, only using semi-dry deacidification and denitrification in SNCR furnace cannot meet the requirements

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