Garbage incineration power plants, is it really people think "smoke-filled" look? In fact, the selection of waste incinerator itself rather than the pursuit of full combustion, and can not be avoided leachate, flue gas and fly ash and other pollutants can be advanced through the professional treatment, so as to achieve environmental standards.
Multilayer filtration incineration of pollutants Waste power generation technology to achieve multiple purification
Waste incineration is becoming one of the main ways of domestic garbage disposal. The whole country is actively investing in waste incineration power plants in order to maximize the utilization of resources. However, the incineration plant will face some obstacles in the early stage of its construction. Concern over whether it will cause secondary pollution and how much harm it ends up attracts much attention.
It is worth noting that the main reason for over-decontaminating waste incineration is that people are unfamiliar with the principles and techniques of waste incineration. From a technical point of view, the leachate, flue gas and fly ash and other substances existing in China's waste incineration power generation process can be professionally treated to meet environmental standards.
Garbage incinerator use
At present, China's use of garbage incinerators point of view, commonly used, including pyrolysis furnace, grate furnace and fluidized bed, the use of different principles of incineration, also have their own advantages and disadvantages. For example, pyrolysis furnace under the conditions of isolation of air, to protect the full decomposition of organic matter, simple structure, lower cost, but slightly less processing capacity, and the carbon content of waste is relatively high.
As for the grate furnace, mainly for large cities, with oxygen combustion way to make the garbage fully burn. The processing technology is mature, large capacity, but when the furnace and shutdown should pay extra attention to temperature control, and maintenance prices are relatively high. Fluidized bed is currently favored as an incinerator, with high combustion efficiency, less waste gas generation and stable operation. However, the disadvantages are obviously that the treatment and operation and maintenance costs are relatively high.
Leachate treatment
Since incineration itself must maintain a high temperature of Baidu, poisonous and harmful substances can be decomposed, which is also the environmental protection attribute of incineration itself. In addition, the waste incineration plant also has leachate treatment processes, commonly used technologies include biochemical treatment, advanced oxidation treatment, membrane processing and evaporation treatment. Leachate composition is generally complex, so the treatment technology will be integrated according to the situation.
Commonly used in the landfill leachate treatment combinations include "biochemical + advanced oxidation + depth treatment", "biochemical + membrane process", and strive to maximize the removal of leachate organic pollutants, salt, ammonia nitrogen, phosphorus Other substances. Use of a variety of techniques, the leachate of waste incineration stratification, the discharge of waste water is best to meet the reuse standards.
Burning flue gas purification
The incineration plant is not necessarily the smoky sight of people's imagination. At present, the incineration plant in China is technically fully capable of handling the flue gas emitted from incineration. In the flue gas treatment process, the focus of removal of the object there are two VA British, but also a kind of organic matter, as well as particulate matter, heavy metals, sulfur dioxide, carbon dioxide, hydrogen fluoride and other toxic and harmful substances.
In accordance with the removal of different substances, flue gas purification process can be divided into NOx removal process, particulate removal process, heavy metal and dioxin removal process. The harmful substances in flue gas are reduced to elemental elements by reductant or desorbed by adding catalyst or filtering and conversion can effectively purify the flue gas from incineration. Moreover, as with leachate treatment, flue gas cleaning is also often used in combination processes to achieve multiple decontamination goals.
Incineration fly ash treatment
Fly ash treatment is also a technology of considerable concern in the field of waste incineration power generation. Fly ash generated from waste incineration is huge and contains some toxic and hazardous substances, which are hazardous solid wastes. In terms of decontamination treatment, the incineration plant generally needs to be cured. The processes used include the cement curing method, the stone stabilization method and the melt solidification technique.
Of course, fly ash treatment will also use some other processes, such as firing ceramsite technology, a fly ash as raw material for the preparation of ceramsite. There are wet chemical treatment is the use of acid-base proposed heavy metals, a resource recovery process. Or is the safe landfill, that is, on-site treatment, a direct landfill, safe and reliable.
In summary, not only waste incineration power generation itself can "turn waste into treasure," the key pollutants in the treatment also have a more mature technology. The construction of a waste incineration power plant will open up a better outlet for domestic waste disposal. The problem of secondary pollution can also be completely solved on the technical level, which is both environmentally friendly and economical.
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