Method for purifying high-temp. smoke from garbage incinerator

Abstract

The method for cleaning high-temp. smoke produced by garbage incinerator is characterized by that in the flue gas with 600-800 deg.c discharged by garbage incinerator the sodium-alkali modified lime is added to make acid gas being in the flue gas react with sodium-alkali modified lime and be absorbed, then the solid reaction product and flyash carried by flue gas are collected by high-temp. dust-collector together, so that the solid reaction product can be separated from flue gas, and the cleaned flue gas can be fed into heated surface, and cooled, and the harmful substance de novo can not be synthesized in the flue gas, and the toxicity of the cleaned flue gas product and the flyash can be greatly reduced. Said invention is simple in process and good in effect.

Description

technical field [0001] The invention relates to a method for purifying high-temperature flue gas of a garbage incinerator, which is used for purifying flue gas discharged from various incinerators for burning garbage. Background technique [0002] The flue gas of waste incinerator (referred to as flue gas) contains acid gas HCl, Cl 2 , SO 2 and various pollutants such as fly ash, heavy metals and organic matter. Existing waste incinerator flue gas purification devices with waste heat recovery systems are installed between the rear heating surface and the chimney, such as typical dry, semi-dry and wet flue gas purification systems (A.John Chandler, T.TaylorEighmy et al. Municipal solid waste incinerator residues [M]. The Netherlands: Elsevier Science B.V., 1997. p101~133). There are three main problems in this waste incinerator tail flue gas purification method which is usually lower than 300°C: (1) high temperature corrosion of the heating surface. Studies have shown tha...

AI Technical Summary

Problems solved by technology

There are three main problems in this method of flue gas purification at the tail of the waste incinerator, which is usually lower than 300°C: (1) high temperature corrosion of the heating surface

In order to control the emission of dioxins into the atmosphere along with the flue gas, it is necessary to inject activated carbon into the flue gas to increase the operating cost of the flue gas purification system

(3) The collected fly ash and flue gas purification products are highly toxic

A large flow of flue gas flows through the high-temperature dust collector, which will increase the resistance of the flue or require a larger-capacity dust collector, occupying space and increasing heat loss

Although the national invention patent "flue gas from flue gas desulfurization method of medium-temperature dry circulating fluidized bed" (publication number: CN1214954A, publication date: April 28, 1999) adopts a temperature range of 400-800°C, the patent applies to For desulfurization, it cannot meet the acid gas HCl and Cl 2 Purification requirements, the "steam activation" technology in this patent cannot be used for lime to absorb HCl and Cl 2 reaction product of

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