The flue gas purification system is one of the key equipments for a waste incineration plant, because the flue gas generated during the waste incineration process contains a large amount of pollutants. If these pollutants are not controlled, it will cause secondary pollution of the waste incineration plant. The selection of an efficient flue gas purification system is the key to preventing the secondary pollution of waste incineration plants and the emission of flue gas.
The main pollutants produced during the incineration of waste are the following: Incomplete combustion products: by-products resulting from poor combustion, including carbon monoxide, carbon black, hydrocarbons, alkenes, ketones, alcohols, organic acids, and polymers. Dust: Inactive metal salts, metal oxides, or incompletely combusted materials in the waste. Acid gases: include hydrogen chloride, hydrogen halides (fluorine, bromine, iodine, etc., sulfur oxides), and phosphorus pentoxide and phosphoric acid. Heavy metal pollutants: including lead, chromium, mercury, cadmium, arsenic and other elemental states, oxides and chlorides. Dioxins: Dioxins and furans are included.
At present, the development of waste incineration flue gas purification technology can be divided into wet, dry, and semi-dry methods depending on whether it generates wastewater and the form in which the absorbent is added. Due to the high investment cost of the wet method, the waste water produced contains heavy metal elements and will cause secondary pollution. Therefore, this technology is rarely used in domestic waste incineration exhaust gas treatment systems. Although the spray drying technique was very popular in the 1980s, due to the high-speed rotation characteristics of the high-speed rotating spray head used in its equipment, localization is still in the experimental stage and has not been effectively applied, so there is uncertainty; In addition, due to the instability of the quality of the lime slurry, it is very easy to cause the problems of nozzle and pipeline clogging. In addition, the system also has the defects that the absorbent cannot be recycled, and the ratio of calcium to sulfur is relatively high.
In order to achieve stable operation, reduce costs, and meet more and more stringent environmental protection requirements, this project uses a semi-dry flue gas treatment system with an independent humidity control device, ie, "quench tower + fluidized bed reaction tower + pre-precipitator + activated carbon Flue gas purification system with injection device + high efficiency bag filter
The focus is on the control of pollutants generated during the incineration of waste and dust treatment. By analyzing the causes, types and components of pollutants, combined with experiments, research, engineering applications and corresponding monitoring data, a waste incineration flue gas treatment device suitable for China's national conditions was developed. Combined with the boiler combustion method and combustion control, the emission of organic gases, heavy metals, and dioxins, furans and other organic pollutants generated by waste incineration will meet the specified emission standards.
The system can meet the following requirements: The system has a total of 2 sets of flue gas purification equipment, which is used for the purification of the tail gas of 2 waste incinerators and waste heat boilers, and removes organic gases such as acid gases and dioxins in the flue gas. And heavy metal pollutants, the flue gas through the system to achieve the required emission standards. The design of the flue gas purification system meets the requirements for the treatment of municipal waste incineration - waste heat boilers from start-up to design maximum operating conditions (exhaust gas volume requirements).
For more information, please pay attention to China's waste gas treatment equipment trading network:/
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