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Capture method of heavy metals and ultrafine particles in the process of solid waste incineration

A technology for solid waste and ultra-fine particles, applied in combustion methods, separation methods, dispersed particle filtration, etc., can solve problems such as low efficiency, reduce costs, promote adhesion, and implement simple and easy effects.

Inactive Publication Date: 2015-12-02
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Previous studies have also sprayed zeolite directly into the incinerator, although it can absorb heavy metal vapor and particulate matter at high temperature, but the efficiency is low

Method used

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  • Capture method of heavy metals and ultrafine particles in the process of solid waste incineration

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Effect test

Embodiment 1

[0038] First, the zeolite is fed into the micro-powder mill through the screw feeder and crushed into zeolite powder between 300-400 mesh; the crushed zeolite powder is transported to the cyclone separator through the dense phase pneumatic conveying device, and is separated by the cyclone separator and then passed through the disc The amount of zeolite powder entering the Venturi ejector accounts for 3‰ of the total mass of municipal solid waste in the circulating fluidized bed incinerator; the mixed wind of the mixed zeolite powder is from the Venturi The inner jet enters the percolate ejector and mixes with the percolate into the hearth of the circulating fluidized bed incinerator. The temperature of the ejection position is 900℃±5℃; when the zeolite powder that captures heavy metals and ultrafine particles is smoked The gas leaves the circulating fluidized bed incinerator, and finally enters the bag filter, where it is efficiently captured by the bag filter and discharged to ...

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Abstract

The invention relates to a heavy metal and ultrathin particles gathering method in the solid waste burning process. The method includes the following steps: (1) grinding zeolite into zeolite powder; (2) mixing the zeolite powder and percolating and spraying the mixture into a solid waste burning furnace; (3) the zeolite power absorbs heavy metal and ultrathin particles inside the solid waste burning furnace, enters into a deduster following smoke, and is gathered by the bag type deduster. According to the heavy metal and ultrathin particles gathering method in the solid waste burning process, the zeolite power efficiently absorbs heavy metal iron in the percolate, the zeolite powder and the percolate enter into the solid waste burning furnace, the heavy metal iron on the surface of the zeolite powder reacts with the zeolite powder to generate eutectic and conduct eutectic melting, potential energy of the zeolite power surface is lowered, the steam reaction zeolite powder and metal in the smoke is further promoted, at the same time the melt surface promotes attachment of the zeolite power to the ultrathin particles, comprehensive performance of the zeolite is improved, and finally the absorbed zeolite powder is gathered by the bag type deduster.

Description

technical field [0001] The invention relates to the fields of solid waste incineration technology and air pollutant control, in particular to a method for trapping heavy metals and ultrafine particles in the process of solid waste incineration. Background technique [0002] Solid waste incineration can reduce the volume of solid waste by 90%. At the same time, it has the advantages of resource utilization of solid waste and large daily processing capacity. It is expected to become the main method of solid waste treatment in the future. Solid waste incineration usually results in the emission of highly toxic fumes such as heavy metals, dioxins, SO 2 and NO x wait. Most of these toxic pollutants are emitted in the form of particulate matter, among which submicron ultrafine particulate matter has the highest toxic content and is the most toxic. The current bag filter has a good trapping effect on ultra-micron (particle size greater than 1 μm) particles, but poor on sub-micro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23G5/00B01D46/02B01D53/02B01D53/85B01D53/64
CPCY02A50/20
Inventor 黄亚继王昕晔严玉朋牛淼淼王永兴孙宇
Owner SOUTHEAST UNIV
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