How do waste incinerators control dioxin production?

Garbage incinerator is now a very good way to deal with garbage, to prevent polluting the land and decaying to produce various bacteria, causing air pollution, which is very harmful to the human body, although garbage incineration is a good way to deal with it, but the incineration process will produce dioxin substances, if the absorption of dioxin substances too much will have strong carcinogenicity, so at the same time of waste incineration, we will also pay attention to the control of dioxin products and treatment. So what are the ways to control it, as follows:

Improve the combustion conditions in the furnace

The amount of PCDD/F can be affected by different combustion conditions in the incinerator such as combustion temperature, residence time, disturbance between oxygen and waste, waste pretreatment, fuel replenishment, oxygen supply, etc. Among them, Temperature, Time and Turbulent are collectively known as the "3T", which are the key factors to control the amount of PCDD/F in the incinerator. The most commonly used process management measure today is the "3T" principle. It is generally believed that the PCDD/F present in the fuel can be destroyed at temperatures above 850°C; However, if complete combustion of particulate carbon-containing substances is to be required, the temperature in the furnace must reach more than 1000°C. At the same time, it is necessary to ensure a certain residence time, at 1000 °C, the residence time of gas in the furnace should exceed 1s; At 850°C, it is more than 2s. In addition, turbulence needs to be created in the combustion chamber so that the air and fuel can be mixed evenly, further guaranteeing complete combustion, and the recommended turbulent flow has a Reynolds number of more than 10,000

Control of temperature and time in the post-combustion zone

The selection of incinerators that meet the standards of our country, the quality assurance of the incinerators produced by our company, please feel free to use. Control the combustion temperature to ensure that the flue gas stays in the area where the temperature in the combustion chamber reaches more than 850 °C for no less than 2 seconds, so that the gas of secondary combustion forms a swirl, so that the combustion is more complete and sufficient, and the dioxin can be fully decomposed. When the flue gas temperature drops to the range of 300 °C ~ 500 °C, a small amount of dioxins that have been decomposed will be regenerated, therefore, the design considers to reduce the cross-sectional area of the tail of the waste heat boiler as much as possible, so that the flue gas flow rate is increased, and the exhaust gas temperature is quickly cooled to below 260 °C, so as to reduce the residence time of the flue gas from high temperature to low temperature, so as to reduce the regeneration of dioxins.

Activated carbon assisted

An activated carbon induction device can be arranged on the flue of the flue gas cleaning system to adsorb dioxins. At the same time, the medium continues to deal with dioxins. When using a bag filter, when the flue gas passes through the filter layer formed by particulate matter, the residual trace dioxins in the dusty flue gas can still be filtered and adsorbed by the powder cake layer composed of unreacted activated carbon powder in the filter layer to be further purified.

The above is a summary of the methods that can reduce dioxins, and for incineration manufacturers, it is important to pay attention to air pollution measures. Hope it will help you