System and method for treating dioxin in incineration fly ash through continuous microwave hydrothermal method

A microwave hydrothermal method and fly ash incineration technology, applied in the field of fly ash disposal, can solve the problems of temperature and mechanical alternating stress that cannot meet the requirements of processing materials, difficult to accurately measure the relevant parameters of the reaction system, and high field strength requirements. Problems such as the inability to realize working conditions, to achieve the effect of high resource utilization potential, easy continuous control, and small footprint

Active Publication Date: 2021-10-22
宝武集团环境资源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above technology is only suitable for small and micro experimental equipment at the laboratory level. Its power density is low, and it cannot be realized for working conditions with high field strength requirements, and it is difficult to accurately measure the relevant parameters of the reaction system. In addition, because microwave heating mainly focuses on On the material supporting device or device at the bottom of the microwave oven chamber, the materials are not heated uniformly, and they are all batch-sequential intermittent devices. The batch-sequential intermittent heating method cannot meet the process requirements for continuous heating of the processed materials and The corresponding related processing equipment will also bear greater temperature and mechanical alternating stress. In addition, the corresponding system is limited to a single direction target, and the short board is more obvious.

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  • System and method for treating dioxin in incineration fly ash through continuous microwave hydrothermal method
  • System and method for treating dioxin in incineration fly ash through continuous microwave hydrothermal method
  • System and method for treating dioxin in incineration fly ash through continuous microwave hydrothermal method

Examples

Experimental program
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Effect test

Embodiment 1

[0058] The washed ash in this example is incineration fly ash treated with dechlorination, and the contents of dioxin and some heavy metal elements are shown in Table 1;

[0059] The process of the continuous microwave hydrothermal method of the present embodiment to treat dioxins in the incineration fly ash is as follows:

[0060] (1) adding water to the incineration fly ash after the dechlorination treatment is made into a raw ash slurry with a solid content of 15wt%;

[0061] (2) The raw lime slurry is preheated by the heat exchange device, and the temperature reaches 65°C, and then it enters the buffer stirring tank and is stirred to obtain a pretreated slurry. The pretreated slurry enters the microwave reaction device through the circulating pump for microwave heating. Process to obtain a circulating slurry, wherein the stirring speed is 120rpm, the microwave heating treatment temperature is 110°C, and the microwave heating treatment pressure is 0.12-2MPa; then the circul...

Embodiment 2

[0065] The washed ash in this example is incineration fly ash treated with dechlorination, and the contents of dioxin and some heavy metal elements are shown in Table 1;

[0066] The process of the continuous microwave hydrothermal method of the present embodiment to treat dioxins in the incineration fly ash is as follows:

[0067] (1) adding water to the incineration fly ash after the dechlorination treatment is made into a former ash slurry with a solid content of 20wt%;

[0068](2) After preheating the raw ash slurry through the heat exchange device, the temperature reaches 50°C, and then enters the buffer stirring tank for stirring treatment to obtain the pretreated slurry, and the pretreated slurry enters the microwave reaction device through the circulating pump for microwave heating Process to obtain a circulating slurry, wherein the stirring speed is 120rpm, the microwave heating treatment temperature is 150°C, and the microwave heating treatment pressure is 0.12-2MPa,...

Embodiment 3

[0072] The washed ash in this example is incineration fly ash treated with dechlorination, and the contents of dioxin and some heavy metal elements are shown in Table 1;

[0073] The process of the continuous microwave hydrothermal method of the present embodiment to treat dioxins in the incineration fly ash is as follows:

[0074] (1) adding water to the incineration fly ash after the dechlorination treatment is made into a former ash slurry with a solid content of 25wt%;

[0075] (2) The raw lime slurry is preheated by the heat exchange device and the temperature reaches 45°C, and then enters the buffer stirring tank and is stirred to obtain the pretreated slurry, which enters the microwave reaction device through the circulating pump for microwave heating Process to obtain circulating slurry, wherein the stirring speed is 120rpm, the microwave heating treatment temperature is 105-200°C, and the microwave heating treatment pressure is 0.12-2MPa; then the circulating slurry i...

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Abstract

The invention discloses a system and a method for treating dioxin in incineration fly ash through a continuous microwave hydrothermal method. The system for treating dioxin in incineration fly ash through the continuous microwave hydrothermal method comprises a heat exchange device, a buffer stirring tank, a circulating pump and a microwave reaction device. The microwave reaction device comprises a microwave safety shielding unit, a slurry circulating unit, a microwave irradiation unit and a control unit; a feed port of the slurry circulating unit is connected with the buffer stirring tank, and a discharge port of the slurry circulating unit is connected with a heat exchange device; and a circulation loop communicated with the buffer stirring tank is arranged on the pipeline between the microwave reaction device and the heat exchange device. A high-parameter microwave treatment technology is implanted on the basis of traditional hydrothermal method treatment, organic pollutants such as dioxin in the incineration fly ash can be removed, meanwhile, large-scale continuous treatment is achieved, and the incineration fly ash dioxin treatment process is continuous, safe, convenient, reliable in effect, small in occupied area, economical and efficient.

Description

technical field [0001] The invention belongs to the field of fly ash disposal, and in particular relates to a continuous microwave hydrothermal method for treating dioxin in incineration fly ash and a method. Background technique [0002] In my country's industrial and municipal solid waste pollution control work, the incineration process is a treatment process with a high weight ratio. The fly ash generated during the incineration process contains a large amount of heavy metals and dioxin-like organic pollutants, which are listed Therefore, it is necessary to carry out harmless disposal and resource utilization of incineration fly ash. [0003] One of the major technical difficulties currently plaguing the resource utilization of incineration fly ash is the safe, continuous, reliable and efficient removal of dioxin-like organic pollutants. Small and micro experimental equipment, but they are all batch-type, non-continuous devices and corresponding systems, and are limited t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/178A62D3/20
CPCA62D3/178A62D3/20
Inventor 卢四平王翔范晓慧甘敏袁瑞瑞钟伟许澧明赵倩倩陈在根李文朱诚杜洪缙徐莉金芳季玉玄
Owner 宝武集团环境资源科技有限公司
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