Device and method for disposing sludge based on chemical looping combustion

Abstract

The invention discloses a device and method for disposing sludge based on chemical looping combustion, and particularly relates to a device which can dispose the sludge safely in a combustion process based on the chemical looping combustion process of circulated oxygen carriers. The device comprises a circulation loop formed by an air reactor, a cyclone separator, a fuel reactor and a back-feeder. According to the method, reduction state oxygen carriers and air are subjected to oxidation reaction in the air reactor to generate oxidation state oxygen carrier particles, after the separation of the cyclone separator, oxidation state oxygen carrier particle calcium enters the fuel reactor, the sludge is subjected to pyrolyzation and gasification reaction in the fuel reactor to generate fuel gas, the fuel gas and the oxidation state oxygen carriers is subjected to reduction reaction to generate carbon dioxide, water vapor and reduction state oxygen carriers, the carbon dioxide, the water vapor and a small amount of fuel gas which does not react completely in the fuel reactor enter the air reactor through the exhaust pipe of the fuel reactor, and the reduction state oxygen carriers in the fuel reactor returns to the air reactor through the back-feeder.

Description

technical field [0001] The present invention is a combustion and disposal method of sludge, specifically a device and method for realizing the process of burning sludge based on chemical chains and safely disposing of sludge in the combustion process. Background technique [0002] With the acceleration of urbanization in our country, the rate of urban sewage treatment has increased year by year, and as a by-product of the sewage treatment process, the output of domestic sludge has also increased sharply. Sludge contains toxic and harmful substances such as pathogens, heavy metals and persistent organic matter. Without effective disposal, it is very easy to cause secondary pollution to groundwater and soil, directly threatening environmental safety and public health. [0003] At present, the treatment methods of domestic sludge in the world mainly include: use as agricultural fertilizer, landfill, incineration and so on. The content of heavy metals in domestic sludge far exc...

AI Technical Summary

Problems solved by technology

[0005] Domestic sludge contains a large amount of organic chlorine compounds and inorganic chlorine compounds. During the sludge incineration process using air or oxygen as an oxidant, organic or inorganic carbon and organic or inorganic chlorine generate dioxins under the action of metal catalysts in fly ash Moreover, domestic sludge contains a large amount of organic matter, corresponding to a high content of organic nitrogen, resulting in a large amount of nitrogen oxide (NOx) emissions from sludge incineration

Therefore, the discharge of pollutants such as dioxins and nitrogen oxides is still a big problem that traditional sludge incineration must face

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