Waste Incinerator Dust And Technology
1: Overview Recent years, with improvement of living standards
, and make municipal waste discharge increased, and its handling has become a social problem. General municipal waste, solid material volume reduction, detoxification, as far as possible from the burning furnace processing has become mainstream, but for the municipal solid waste incineration, not only exhaust the smoke, NOX, SOX, HCL, etc. Removal of is necessary, but also smoke contains dioxins and heavy metals compounds to reduce the technology is also important. In addition, the recent global environmental issues, particularly greenhouse gases from the viewpoint of suppression, the waste heat generated by incineration effective use. (Hangzhou, Shenzhen, garbage power plants have been built, using waste heat generated by incineration to generate electricity).
2: municipal solid waste incineration fly ash generated gas and the characteristics of
1. Waste generation of gas properties Emissions from waste incineration facilities
gas containing dust, NOX, SOX, HCL, CO, and dioxin and other components of the emissions of these substances have also developed a number of relevant national standards and regulations. Substances emissions standards to limit emissions.
Order to comply with the provisions of this kind, various environmental environmental protection technology used in waste incineration facilities, in order to reduce NOX, using the second combustion method (part of the combustion air to join the middle of the stove, controlled oxidation of the atmosphere and reduce NOX Output of methods), exhaust gas recirculation method (the gas mixture to the combustion air, reduced oxidative atmosphere, while reducing the occurrence of quantitative methods NOX) and other control technologies and produces added atmosphere Ershi NOX NOX decomposition, reduction and denitrification Technology.
Flue gas sulfur, usually as waste contains less sulfur content, low concentration, such as described later, when HCL was removed with the removal, the removal of acid gases are wet, semi-dry , and other dry methods, wet, by lye to absorb, but there is corrosion due to the absorption liquid, the selected device material is difficult, and there are wastewater treatment problems, and more recently by semi-dry, dry, normal with the furnace and the flue spray into the CaCO3 powder or slurry lime scrubber, etc., before the semi-dry, dry is more difficult to improve the removal rate of SOX, but in the presence of HCL cases, the injection of lime, shows high desulfurization efficiency. Reaction of the reaction products produced in the filter can be recovered later.
Ago, for the fuel contains heavy metals, hg, pb, cd and so on, people, but heart due to low boiling point, easy to form a gaseous material, and has condensed into particles of heavy metals is difficult to capture the tendency of the material emissions, as it is of dust particles in the capture of the performance increased in recent years, this has no major issues to consider.
In the waste, in addition to the above material things, HCL and dioxin are concerned, HCL SOX removal and removal of same, carried out through the spray of lime powder to the flue and mud. In the air in the reaction, or in the filter on the accumulation of dust layer by absorbing reaction, it shows that removal.
Dioxin or attached to gas-like particles are discharged, in order to suppress the production in the combustion furnace, the air can be used to promote complete combustion and the combustion temperature, increase the residence time within the burner and other measures, but because at 300 in the vicinity of exhaust, will be re-generated, so no long run this temperature field is the most effective. For waste incineration facilities, in order to prevent corrosion and chloride absorption, and more about running filter at 300 , but because at this temperature produces nearly dioxin substances and heavy metal with fly ash as a catalyst within the filter dioxin case, it can use lower operating temperatures and dust and other measures to improve precipitator performance.
2. Characteristics of incinerator fly ash generated
Entrance in the dust generated by the burning of the concentration of fly ash, with the value from the waste, combustion and different, from several g/Nm3 to 20g/Nm3 about average size is about 10 ~ 40 m, but also contains areas of sub-micron dust, in this area is concentrated with heavy metals, it is necessary to adopt ESP or bag dust removal.
Waste Incinerator Dust And Technology
By: frbiz2@foxmail.com
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