Blogs
The Hazards and Governance Of The Dioxin
1.Source of dioxin
Dioxins are the general name for a class of chlorinated polynuclear aromatic compounds, abbreviated as PCDD/Fs. Mainly include polychlorinated dibenzo-p-dioxins (pCDDs), polychlorinated dibenzofurans (PCDFs), etc. The source and formation mechanism of dioxin are relatively complex and are produced primarily by the continuous burning of mixed garbage. When plastics, paper, wood and other materials are burned, they will crack and oxidize under high temperature conditions, thus producing dioxins. Influencing factors include waste composition, air circulation, combustion temperature, etc. Research shows that the optimal temperature range for dioxin generation is 500-800°C, produced due to incomplete combustion of garbage. In addition, under lower temperature conditions, under the catalysis of transition metals, dioxin precursors and small molecule substances can be synthesized through low-temperature intentional catalysis. However, under sufficient oxygen conditions, the combustion temperature reaching 800-1100°C can effectively avoid the formation of dioxin.
2.The dangers of dioxin
As a by-product of incineration, dioxins are of great concern due to their toxicity, persistence and bioaccumulation. Dioxins affect the regulation of human hormones and sound field factors, are highly carcinogenic, and damage the immune system. Its toxicity is equivalent to 1,000 times that of potassium cyanide and 900 times that of arsenic. It is listed as a first-level human carcinogen and one of the first batch of controlled pollutants under the Stockholm Convention on Persistent Organic Pollutants.
3.Measures to reduce dioxin in Gasification Incinerator System
The flue gas emission of the Gasification Incinerator System developed by HYHH complies with the 2010-75-EU and China's GB18485 standards. The measured average value is ≤0.1ng TEQ/m3, which minimizes secondary pollution during the waste incineration process. The Gasification Incinerator adopts gasification + incineration process to ensure that the combustion temperature in the furnace is above 850-1100°C and the flue gas residence time is ≥ 2 seconds, reducing the production of dioxin from the source. The high-temperature flue gas section uses a quenching tower to quickly reduce the flue gas temperature to below 200°C to avoid secondary production of dioxins at lower temperatures. Finally, the emission standards of dioxins will be achieved.
