Application of calcium oxide in controlling pollution of dioxin and similar pollutant in tail gas from incinerator

Abstract

Calcium oxide is used as the retardant for the dioxin producing process. Crushed and dried calcium oxide is set in the tail gas exhauster of incinerator, and under the temperature of 220-500 deg.c, calcium oxide is reacted with precursor of dioxin in cooling waste gas to retard the generation of dioxin and reduce the amount of exhausted dioxin. The reactor may be installed inside the waste gas treater for incinerator, so that the tail gas entering the reactor via pipeline reacts with calcium oxide. In the same time, calcium oxide can also absorb partial acid gas to reduce relevant exhausted pollutant. The reused calcium oxide may be used as material for producing cement.

Description

technical field [0001] The invention relates to the application of calcium oxide in pollution control, in particular to the application of calcium oxide in the control of dioxin pollution from incinerator tail gas. Background technique [0002] In the process of tail gas treatment, some existing incinerator pollution control facilities use spraying to add lime slurry (calcium hydroxide Ca(OH) 2 ) method, but its purpose is only to remove SO 2 and acid gases such as HCl. Now, studies have shown that in addition to acidic gases, harmful substances such as dioxins are produced during the incineration process, which are mainly produced during the cooling process of flue gas, especially in the range of 220-500 °C. Condensation formation of dioxins is the main mechanism (References: 1. Zheng Minghui, Liu Jiayan, Bao Zhicheng, Xu Xiaobai, Research Progress in the Formation and Degradation of Dioxins, Science Bulletin, 1999, 44, 455. 2. Mechanism of the Formation of Polychlorinat...

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Problems solved by technology

[0002] In the process of tail gas treatment, some existing incinerator pollution control facilities use spraying to ad

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