Gas blowby prevention method used for circulating fluid bed garbage furnace, and external type overheating device

Abstract

The invention discloses a gas blowby prevention method used for a circulating fluid bed garbage furnace, and an external type overheating device. The device comprises an overheating device and a first stage material returning device, wherein the first stage material returning device is used for realizing the material sealing and the material returning, and comprises a first material inlet chamber, a first material returning chamber and a first overflow opening, the first material inlet chamber is communicated with a material outlet opening of an overheating chamber, the first material returning chamber is communicated with a furnace hearth of the garbage furnace through a first overflow opening, and a material inlet opening of the overheating chamber is communicated with a gas-solid separator arranged at the garbage furnace. On the basis of the invention, the gas blowby of flue gas containing acidic gas such as HCL and the like in the furnace hearth to the external type overheating device can be effectively prevented, so the heated surface of a snake-shaped pipe in the external type overheating device is protected from metal corrosion.

Description

technical field [0001] The invention relates to an external superheating device for a circulating fluidized bed garbage incinerator, in particular to a channeling prevention method and an external superheating device for a circulating fluidized bed garbage incinerator. Background technique [0002] The external superheater for circulating fluidized bed waste incinerator is a non-combustion hot ash bubbling fluidized bed composed of multiple chambers. The lower part of each chamber is equipped with air distribution panels and bellows, and the chamber is arranged in a serpentine shape. The heating surface of the tube and the heating surface of the serpentine tube are immersed in the fluidized hot ash, and the steam is passed into the serpentine tube to cool the hot ash. [0003] When garbage is incinerated in a circulating fluidized bed, the concentration of acid gases such as HCL in the flue gas is very high. These acid gases are very corrosive to the metal pipes of the super...

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Problems solved by technology

[0005] However, the currently used external superheater often has tube bursts caused by corrosion during boiler operation. One important reason is that gas blowing from the furnace of the waste incinerator into the external superheater causes acid gases such as HCL to blow to the serpentine tube. Corrosion of heated surfaces

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