Removing system for dioxin and metallic mercury in flying ash

A technology for metal mercury and dioxin removal, which is applied in the field of fly ash treatment, can solve the problem that it is difficult to remove dioxins and metal mercury from fly ash at the same time, and achieves the effect of efficiently removing mercury and solving pollution problems.

Pending Publication Date: 2018-05-18
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a system for removing dioxin and metallic mercury in fly ash, s

Method used

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  • Removing system for dioxin and metallic mercury in flying ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The domestic waste incineration fly ash with a water content of 1% is added to the dioxin dechlorination reaction chamber through the middle disconnected screw feeder. Before the normal operation of the device, N 2 Replace the air in the dioxin dechlorination reaction chamber;

[0047] Control the spiral in the dioxin dechlorination reaction chamber so that the fly ash continuously rotates from the fly ash inlet to the dioxin dechlorination fly ash outlet, and during the rotation, control the oxygen content in the dioxin dechlorination reaction chamber to 5ppm , the temperature is 400°C, so that the dioxins in the fly ash undergo dechlorination reaction in the dioxin dechlorination reaction chamber, and the dechlorination reaction lasts for 60 minutes, and the dedioxin fly ash and the dioxins carried in the non-oxidizing gas are obtained. Mercury vapor;

[0048] The de-dioxin fly ash is put into the quenched fly ash bin from the outlet of the de-dioxin fly ash, and the...

Embodiment 2

[0053] Domestic waste incineration fly ash with a water content of 0.1% is fed into the dioxin dechlorination reaction chamber through a middle disconnected screw feeder, and N 2 Replace the air in the dioxin dechlorination reaction chamber;

[0054] Control the spiral in the dioxin dechlorination reaction chamber so that the fly ash is continuously rotated from the fly ash inlet to the dioxin dechlorination fly ash outlet, and during the rotation, the oxygen content in the dioxin dechlorination reaction chamber is controlled to be 1%, the temperature is 500°C, so that the dioxins in the fly ash undergo a dechlorination reaction in the dioxin dechlorination reaction chamber, and the dechlorination reaction lasts for 60 minutes to obtain the dedioxin fly ash and carry it in the non-oxidizing gas mercury-containing vapor;

[0055] The de-dioxin fly ash is put into the quenched fly ash bin from the outlet of the de-dioxin fly ash. The dioxin content calculation shows that the d...

Embodiment 3

[0060] The incineration fly ash of medical waste with a water content of 5% is fed into the dioxin dechlorination reaction chamber through the middle disconnected screw feeder. Before the normal operation of the device, Ar is introduced to replace the air in the dioxin dechlorination reaction chamber;

[0061] Control the spiral in the dioxin dechlorination reaction chamber so that the fly ash continuously rotates from the fly ash inlet to the dioxin dechlorination fly ash outlet, and during the rotation, control the oxygen content in the dioxin dechlorination reaction chamber to 10ppm , the temperature is 350°C, so that the dioxins in the fly ash undergo a dechlorination reaction in the dioxin dechlorination reaction chamber, and the dechlorination reaction lasts for 60 minutes to obtain the dedioxin fly ash and the dioxins carried in the non-oxidizing gas. Mercury vapor;

[0062] The de-dioxin fly ash is put into the quenched fly ash bin from the outlet of the de-dioxin fly ...

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Abstract

The invention provides a removing system for dioxin and metallic mercury in flying ash. The removing system comprises a dioxin dechloridation unit, a gas-liquid separator unit and a mercury adsorptionunit. The dioxin dechloridation unit is used for carrying out a dechloridation reaction on the dioxin in the flying ash and is further provided with a flying ash inlet and a mercury-containing steamoutlet. The gas-liquid separator unit is used for cooling mercury-containing steam to obtain separated mercury-containing liquid products and mercury-containing tail gas and is further provided with amercury-containing steam inlet and a mercury-containing tail gas outlet. The mercury-containing steam inlet is connected with the mercury-containing steam outlet. The mercury adsorption unit is usedfor adsorbing the mercury-containing tail gas and is further provided with a mercury-containing tail gas inlet. The mercury-containing tail gas inlet is connected with the mercury-containing tail gasoutlet. The dioxin dechloridation unit is used for removing the dioxin in the flying ash, the gas-liquid separator unit is used for cooling the mercury-containing steam so that most of the metallic mercury can be separated out in a liquid-state mode, then remaining mercury elements in the mercury-containing tail gas are removed with the mercury adsorption unit, and therefore the efficient mercuryremoving effect can be achieved.

Description

technical field [0001] The invention relates to the field of fly ash treatment, in particular to a system for removing dioxin and metallic mercury in fly ash. Background technique [0002] Waste incineration, medical waste incineration and industrial production will produce incineration fly ash, which contains harmful substances such as dioxin and heavy metal mercury, which is hazardous waste and must be treated in a harmless manner. Heavy metals are solidified by chelating agents or cement to obtain stable compounds. However, dioxins are not stabilized by curing and require further processing. [0003] Dioxin has strong chemical stability. Once it enters the organism, it accumulates in the body due to its high fat solubility and is difficult to excrete. It is the substance with the most carcinogenic potential discovered so far, also known as the "poison of the century". . Exposure to an environment containing dioxins can cause a variety of pathological symptoms, and lead...

Claims

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Application Information

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IPC IPC(8): B09B3/00B01D53/02
CPCB01D53/02B01D2253/102B01D2257/602B09B3/10B09B2101/30
Inventor 高术杰马明生刘杰陈德喜刘海威
Owner CHINA ENFI ENGINEERING CORPORATION
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