Ultra-low emission system for high-sulfur sludge incineration flue gas

Abstract

The invention provides an ultra-low emission systemfor high-sulfur sludge incineration flue gas. The ultra-low emission system comprises a circulating semi-dry desulfurization system, a bag dust removal system and a wet washing system which are sequentially arranged in the flue gas treatment direction and further comprises an activated carbon injection device, the circulating semi-dry desulfurization system comprises a cooling and humidifying tower and a desulfurizing agent mixing and spraying device, the flue gas outlet of the cooling and humidifying tower is connected with the dust remover of the bag dust removal system through a mixing flue, the dust discharge outlet of the dust remover is connected with the desulfurizing agent mixing and spraying device, outlets of the desulfurizing agent mixing and spraying device and the activated carbon spraying device are respectively connected into the mixing flue through spraying orifices and are used for providing a desulfurizing agent and activated carbon. and the flue gas outlet of the dust remover is connected with the wet washing tower of the wet washing system. According to the system, the material consumption and the operation cost are effectively reduced on the premise of ensuring the emission index, and the feasibility of comprehensive popularization of the industrial waste gas ultra-low emission concept in the solid waste field is improved.

Description

【Technical field】 [0001] The invention relates to the technical field of solid waste incineration flue gas treatment, in particular to an ultra-low emission system for high-sulfur sludge incineration flue gas. 【Background technique】 [0002] Sludge incineration is a common sludge disposal method that destroys all organic matter, kills pathogens, and minimizes sludge volume. However, in the process of sludge incineration, a large amount of toxic and harmful waste gas needs to be treated, and one of the most important harmful components is SO 2 . The sulfur content in municipal sludge is generally below 1%. When the sludge is incinerated, most of the sulfur is in the form of SO 2 form of emission. [0003] SO emissions from sludge incineration 2 , Most of them are removed by dry spraying + wet washing process. However, some sludges have high sulfur content and are converted into high-concentration SO after incineration. 2 , the concentration of sulfur dioxide even reache...

AI Technical Summary

Problems solved by technology

With the improvement of relevant emission standards for air pollution prevention and government departments' attention to solid waste disposal, many solid waste incineration plants implement the "Pollution Control Standards for Domestic Waste Incineration" (GB18485- 2014), some regions even require stricter emission standards than the EU 2000 standard EU2000 / 76 / EC or GB13223-2011. It is obviously difficult to meet the requirements with the existing technical route disposal. Now a kind of high-sulfur sludge incineration with ultra-low flue gas is proposed. exhaust system

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