Device for treating sludge based on heat storage type chemical-looping combustion and method of device

Abstract

The invention discloses a device for treating sludge based on heat storage type chemical-looping combustion and a method of the device, and belongs to the technical field of sludge treatment. The device comprises a reactor, a reversing valve, sludge conveying channels and a tail gas treatment device; the reactor comprises an oxidation reactor and a reduction reactor, a heat storage body is arranged on the periphery of the reactor, the reversing valve is arranged between the oxidation reactor and the reduction reactor, the sludge conveying channels are both formed in the oxidation reactor and the reduction reactor, and the reversing valve is connected with the tail gas treatment device. Through the oxidizing reaction, the reduction reaction and the tail gas treatment, generation of dioxin in the sludge incineration process can be removed, meanwhile, emissions of NOX and the like in the sludge incineration process can be reduced, smoke gas waste heat is used for greatly improving the energy utilization efficiency of the sludge incineration process, meanwhile, through reversing valve switching and intermittent sludge feeding, the reactor periodically and alternatively works, the work efficiency of the process is improved, and the cost is saved.

Description

technical field [0001] The invention relates to a device and method for treating sludge, in particular, to a device and method for treating sludge based on thermal storage type chemical chain combustion, belonging to the technical field of sludge treatment. Background technique [0002] In recent years, with the rapid growth of my country's sewage treatment capacity, sludge production has also increased significantly. As the final product of sewage treatment, sludge contains a large amount of toxic and harmful substances such as pathogens, heavy metals and persistent organic compounds. According to statistics, more than 80% of the sludge in the country has not been treated and disposed of harmlessly, causing secondary pollution to the environment. The situation is very serious. In response to this problem, in recent years, the state has issued a series of relevant policies, standards and laws and regulations involving sludge treatment and disposal, which has prompted the fo...

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Problems solved by technology

[0010] (1) The working efficiency of the process device is low

Due to the reciprocation of materials or oxygen carriers in the process, this not only wastes the reaction time of materials or oxygen carriers, but also takes away a lot of heat in the process of material return, which not only requires high requirements for equipment, but also requires The environment has a certain impact, thereby wasting energy;

[0011] (2) Fuel gas cannot be effectively controlled, resulting in incomplete reaction and generation of harmful gas

Fuel such as sludge undergoes pyrolysis gasification reaction in the fuel reactor to generate fuel gas, and then the fuel gas undergoes reduction reaction with the oxidized oxygen carrier to generate a variety of gases, some of which enter the air reactor, and this part of the gas Unordered entry into the air reactor will cause incomplete reaction of sludge and other fuels, and the heat will not be fully utilized. At the same time, sludge and other fuels will not be effectively burned, and certain polluting gases will be generated and discharged into the air.

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