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Wet purification method for dioxin and heavy metals in solid waste incineration gas

A technology for solid waste and incineration flue gas. It is applied in chemical instruments and methods, separation methods, and dispersed particle separation. Effect

Active Publication Date: 2012-09-19
刘阳生 +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are a few applications in domestic medical waste incinerators, but the effect is not very satisfactory

Method used

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  • Wet purification method for dioxin and heavy metals in solid waste incineration gas
  • Wet purification method for dioxin and heavy metals in solid waste incineration gas
  • Wet purification method for dioxin and heavy metals in solid waste incineration gas

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Embodiment 1

[0029] Such as figure 1 As shown, the high-temperature flue gas of the solid waste incinerator is cooled by the heat exchanger to the incineration flue gas 1 with a temperature of 850-1000°C, and enters the first-stage bubbling reactor 2 at a flow rate of 5-10m / s, and the first-stage bubbling reactor The operating pressure in the bubble reactor is atmospheric pressure, the gas residence time is 1-2 seconds, the gas temperature is reduced to 550-650°C, and 60-80% of the particulate matter and 60-80% of the particulate matter in the flue gas are removed in the primary bubble reactor. 70% of acid gas, 50-70% of dioxins, 50-70% of heavy metals; then through the second-stage bubble reactor 3, the operating pressure in the second-stage bubble reactor is one atmospheric pressure, and the gas residence time For 2 to 3 seconds, the gas temperature is reduced to 70-90°C to remove residual particles, heavy metals, acid gases and dioxins in the flue gas.

[0030] Both the first-stage and...

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Abstract

The invention discloses a wet purification method for dioxin and heavy metals in solid waste incineration gas, which comprises the following steps that: after high-temperature gas in a solid waste incinerator is cooled, firstly the gas is processed by a primary bubbling reactor to remove 60 to 80 percent of particulate matters, 60 to 70 percent of acid gas, 50 to 70 percent of dioxin and 50 to 70percent of heavy metals in the gas and then is processed by a secondary bubbling reactor to remove the residual particulate matters, heavy metals, acid gas and dioxin in the gas; and the purified gasis purified by an active carbon adsorption tower after being processed by a dehumidifier and is discharged into the atmosphere by a draught fan, wherein the primary and secondary bubbling reactors both contain an alkaline chemical agent and sulphide. The wet purification method has simple process and lower operating cost and can meet the requirements that the dioxin discharge concentration in the gas is less than 0.1ng TEQ / Nm<3> and the heavy metal discharge is lower than the corresponding national standard limit value.

Description

technical field [0001] The invention relates to a method for wet purification of dioxins and heavy metals in solid waste incineration flue gas. Background technique [0002] At present, the well-known domestic and foreign solid waste incineration flue gas purification technologies for dioxins and heavy metals mainly include wet washing, dry / semi-dry lime deacidification, spraying activated carbon and other adsorbents combined with bag filter for dust removal, and bag filter Dust removal combined with activated carbon adsorption bed and other methods. [0003] Wet scrubbing is widely used in Sweden and other European countries, and the dioxin removal efficiency is very high, and the dioxin concentration at the flue gas outlet can reach 0.1ng TEQ / Nm 3 Below, the concentration of heavy metals is also lower than the air pollutant discharge standard value; but this method produces a large amount of waste water, the treatment process of waste water is complicated, and the operati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/72B01D53/64
Inventor 丁维桂刘阳生王乐民吕夫龙耿得喜
Owner 刘阳生
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