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Sludge drying gas generator and control method for inhibiting emission of dioxin in flue gas

A control method and dioxin technology, applied in dehydration/drying/concentrated sludge treatment, energy wastewater treatment, etc., to achieve the effect of improving the degree of drying and application range, sufficient suppression atmosphere, and stable operation

Active Publication Date: 2015-02-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to dry sludge with low energy consumption and efficient use of waste heat flue gas from waste incinerators, stably provide sludge drying gas that can effectively suppress dioxin emissions in flue gas, and achieve low emissions of dioxins in waste incinerators is currently an issue. A major challenge for industrial applications

Method used

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  • Sludge drying gas generator and control method for inhibiting emission of dioxin in flue gas
  • Sludge drying gas generator and control method for inhibiting emission of dioxin in flue gas
  • Sludge drying gas generator and control method for inhibiting emission of dioxin in flue gas

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Experimental program
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Effect test

Embodiment 1

[0030] Experimental supplies: waste incineration plant bypass flue gas, wet sludge: received base moisture content M ar =60%; received base sulfur content S ar =0.28%; received base nitrogen content N ar =1.24%; air-dry base sulfur and nitrogen content sum S ad +N ad=0.69%+3.01%=3.70%, the moisture content of the sludge after drying: 13%.

[0031] Experimental conditions: flue gas 500Nm 3 / h, the flue gas flow rate is 7m / s, and the reaction time is 1h.

[0032]

Embodiment 2

[0034] Experimental supplies: waste incineration plant bypass flue gas, wet sludge: received base moisture content M ar =50%; received base sulfur content S ar =0.35%; received base nitrogen content N ar =1.55%; the sum of sulfur and nitrogen content on an air-dry basis S ad +N ad =0.69%+3.01%=3.70%, moisture content of sludge after drying: 10%.

[0035] Experimental conditions: flue gas 500Nm 3 / h, the flue gas flow rate is 7m / s, and the reaction time is 1h.

[0036]

Embodiment 3

[0038] Experimental supplies: waste incineration plant bypass flue gas, wet sludge: received base moisture content M ar =40%; received base sulfur content S ar =0.42%; received base nitrogen content N ar =1.86%; air-dry base sulfur and nitrogen content sum S ad +N ad =0.69%+3.01%=3.70%, the moisture content of the sludge after drying: 8%.

[0039] Experimental conditions: flue gas 500Nm 3 / h, the flue gas flow rate is 7m / s, and the reaction time is 1h.

[0040]

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Abstract

The invention relates to a solid waste and wet sludge synergistic disposal technology, aiming at providing a sludge drying gas generator and a control method for inhibiting the emission of dioxin in flue gas. The sludge drying gas generator comprises a wet sludge drying area and a dry sludge drying area from top to bottom; the control method comprises the steps: feeding wet sludge through a wet sludge feeding hole, and filling high-temperature flue gas with the temperature of 500-600 DEG C into a flue gas inlet. Due to reasonable combination of multiple drying technologies, the device is compact in structure, and the drying efficiency, the drying degree and the application scope are remarkably improved.

Description

technical field [0001] The invention relates to solid waste and wet sludge co-processing technology, in particular to a sludge drying gas generation device and control method for suppressing dioxin emissions in flue gas. Background technique [0002] With the acceleration of urbanization in my country, the discharge of solid waste, which mainly includes municipal solid waste, medical waste and industrial hazardous waste, is also increasing. At present, the incineration method of disposing of solid waste is an effective technical method to achieve reduction, harmlessness and resource utilization, but the incineration process inevitably produces highly toxic organic pollutants called dioxins. Existing incineration plants will inject a certain amount of activated carbon (50~300mg / Nm 3 ), to control the emission of dioxins, but it cannot completely remove dioxins, it just transfers the adsorption of dioxins in the gas phase to the solid phase. The adsorption effect of ordinary ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/12
CPCY02W10/37
Inventor 李晓东陆胜勇陈彤严建华蒋旭光詹明秀林晓青
Owner ZHEJIANG UNIV