The water emitted from the chimney of a waste incinerator is mainly the condensate produced during the flue gas purification process, also known as "chimney condensate" or "flue gas condensate". This kind of water is formed by the condensation of moisture and some soluble substances in the flue gas on the inner wall of the chimney or in the condenser before the flue gas is discharged to the atmosphere through the chimney, after a series of purification treatment equipment (such as dust collector, desulfurization device, denitrification device, etc.).
The water emitted from the chimney of a waste incinerator mainly contains the following types of water:
1.Water vapor condensation in flue gas: The waste incineration process produces a large amount of water vapor, which is emitted into the atmosphere with the flue gas in the chimney. When the flue gas temperature drops below **, the water vapor will condense into water, which is the main component of chimney condensate.
2.Wastewater generated in the flue gas purification process: Waste incineration flue gas contains a variety of pollutants, such as particulate matter, sulfur dioxide, nitrogen oxides, etc. In order to protect the environment, the flue gas needs to be purified before it can be discharged. During the purification process, some of the pollutants are absorbed or converted into soluble substances to form wastewater. These wastewaters typically include dust collector wastewater, desulfurization wastewater, denitrification wastewater, etc.
3.Ash dissolution water on the inner wall of the chimney: The inner wall of the chimney has been washed by high-temperature flue gas for a long time, and it is easy to form dust. When the flue gas temperature decreases, the soluble substances in the ash may dissolve in the condensate, forming the ash dissolved water on the inner wall of the chimney.
The composition of the water discharged from the chimney of the waste incinerator is complex, containing a variety of inorganic and organic substances, such as sulfates, nitrates, heavy metal ions, polycyclic aromatic hydrocarbons, etc. These substances can have an impact on the environment and human health, so they need to be properly disposed of to ensure that they are discharged up to standard.
In order to reduce the environmental impact of water discharged from the chimney of a waste incinerator, the following measures are usually taken:
1.Improve flue gas purification efficiency: Adopt advanced flue gas purification technology, such as high-efficiency dust collector, low-sulfur combustion technology, selective catalytic reduction, etc., to reduce the pollutant content in flue gas.
2.Strengthen wastewater treatment: properly treat the wastewater generated in the flue gas purification process, such as sedimentation, filtration, adsorption and other methods to remove pollutants in the wastewater to ensure that the wastewater is discharged up to standard.
3.Optimize chimney design: improve the chimney structure, reduce the formation and shedding of ash deposits, and reduce the impact of ash dissolved water on the inner wall of the chimney on the environment.
In short, the water emitted from the chimney of the garbage incinerator is the condensate produced in the flue gas purification process, which mainly includes the water vapor condensate in the flue gas, the wastewater generated in the flue gas purification process and the ash dissolved water on the inner wall of the chimney. To ensure that the environmental impact of this water is minimized, a range of measures are required to treat it and control its discharge.