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A method for efficient control of dioxins in waste incineration

A technology of waste incineration and control methods, which is applied in the direction of combustion methods, incinerators, combustion types, etc., can solve the problems of high cost and dioxin content that cannot meet the emission standards, and achieve controllable costs and avoid equipment transformation Effect

Active Publication Date: 2022-02-22
SHANGHAI ENVIRONMENTAL & SANITARY ENG DESIGN INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since dioxins may be synthesized in various processes of waste treatment, and even re-synthesized in the cooling process after high-temperature thermal decomposition, the current control of dioxin content in waste incineration is mainly through the transformation of equipment. The cost is high; or the re-synthesis of dioxins cannot be avoided by regulation at a certain stage, resulting in the dioxin content in the final fly ash not meeting the emission standards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment 1 provides an efficient control method for dioxins in waste incineration, comprising the following steps:

[0055] a. After blending the garbage with the chelating agent, put it into the incinerator for incineration;

[0056] b. the flue gas produced in step a enters the flue gas scrubber, and sprays lye for processing;

[0057] c. After the flue gas treated in step b exits the tower, the adsorbent is sprayed, and then the fly ash is collected by the dust collector to discharge the gas.

[0058] The weight ratio of the garbage to the chelating agent is 400:1.

[0059] The chelating agent is amino acid salt; the amino acid salt is amino acid calcium.

[0060] The incineration treatment capacity of the incinerator is 400-750t / d, the excess air coefficient is 1.7-1.8, and the pressure inside the furnace of the incinerator is -50kPa.

[0061] The lye is a mixed aqueous solution of 10wt% sodium thiosulfate and 5wt% urea.

[0062] The adsorbent is carbon nanotu...

Embodiment 2

[0065] Embodiment 2 provides an efficient control method for dioxins in waste incineration, comprising the following steps:

[0066] a. After blending the garbage with the chelating agent, put it into the incinerator for incineration;

[0067] b. the flue gas produced in step a enters the flue gas scrubber, and sprays lye for processing;

[0068] c. After the flue gas treated in step b exits the tower, the adsorbent is sprayed, and then the fly ash is collected by the dust collector to discharge the gas.

[0069] The weight ratio of the garbage to the chelating agent is 400:1.

[0070] The chelating agent is amino acid salt; the amino acid salt is amino acid zinc.

[0071] The incineration treatment capacity of the incinerator is 400-750t / d, the excess air coefficient is 1.7-1.8, and the pressure inside the furnace of the incinerator is -50kPa.

[0072] The lye is a mixed aqueous solution of 10wt% sodium thiosulfate and 5wt% urea.

[0073] The adsorbent is carbon nanotube....

Embodiment 3

[0076] Embodiment 3 provides an efficient control method for dioxins in waste incineration, comprising the following steps:

[0077] a. After blending the garbage with the chelating agent, put it into the incinerator for incineration;

[0078] b. the flue gas produced in step a enters the flue gas scrubber, and sprays lye for processing;

[0079] c. After the flue gas treated in step b exits the tower, the adsorbent is sprayed, and then the fly ash is collected by the dust collector to discharge the gas.

[0080] The weight ratio of the garbage to the chelating agent is 400:1.

[0081] The chelating agent is amino acid salt; the amino acid salt is amino acid calcium.

[0082] The incineration treatment capacity of the incinerator is 400-750t / d, the excess air coefficient is 1.7-1.8, and the pressure inside the furnace of the incinerator is -50kPa.

[0083] The lye is an aqueous solution of 10wt% sodium thiosulfate.

[0084] The adsorbent is carbon nanotube.

[0085] Accor...

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Abstract

The invention discloses a method for efficiently controlling dioxins in garbage incineration, which comprises the following steps: a. After blending the garbage with a chelating agent, the garbage is put into an incinerator for incineration; b. The flue gas generated in step a enters the flue gas for washing Tower, spray alkali solution for treatment; c. The flue gas treated in step b leaves the tower and sprays adsorbent, then collects fly ash through dust collector, and discharges gas. This method adopts corresponding measures to control dioxins in the front, middle and back stages of waste incineration treatment. The premixing before incineration reduces the source of chlorine in incineration, and the flue gas produced by incineration limits the formation of dioxins through washing. The required reactant content and catalyst activity, and the residual dioxins are stabilized by adsorption in the later stage, which realizes the overall efficient control of dioxins, avoids complicated equipment modification, and the cost is controllable.

Description

technical field [0001] The invention relates to the field of garbage treatment, in particular to a method for efficiently controlling dioxins in garbage incineration. Background technique [0002] With the rapid development of the national economy, the amount of urban waste is also increasing rapidly, and the "three modernizations" of waste reduction, harmlessness and resource utilization urgently need to be widely promoted. At present, the incineration of garbage is one of the most important and effective methods for the "three modernizations" of garbage. However, the fly ash produced by garbage incineration contains a large amount of dioxins and heavy metals. If it is not harmless and stabilized Chemical treatment will cause serious pollution to the environment. Dioxin is a highly toxic organic chemical substance whose toxicity is 130 times that of cyanide and 900 times that of arsenic. Carcinogenic, teratogenic, but also toxic to the reproductive system, immune system a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23G5/02F23G5/50F23J15/02F23J15/04
CPCF23G5/02F23G5/50F23J15/02F23J15/04
Inventor 陈善平赵爱华张瑞娜余召辉邰俊宋立杰安淼施庆文王瑟澜周洪权刘泽庆宋尧
Owner SHANGHAI ENVIRONMENTAL & SANITARY ENG DESIGN INST CO LTD
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