Method and device capable of inhibiting refuse incineration from generating dioxins

Abstract

The invention relates to a method and a device capable of inhibiting refuse incineration from generating dioxins, which belongs to the field of environmental protection. The device is mainly characterized in that the hearth of the refuse incinerator is communicated with the hearth of a secondary heating furnace through a flue, a flue partition wall is arranged in the hearth of the secondary heating furnace, and a temperature measuring point is arranged in front of the furnace. The method mainly comprises the following steps: when being started or shut down, the refuse incinerator combusts part of coal, so that the furnace temperature is kept above 800 DEG C; fume, which is generated in the process of refuse incineration, directly enters the hearth of the secondary heating furnace through the flue to be combusted for the second time, under the monitoring control of the temperature measuring point, the furnace temperature is kept at 1100-1300 DEG C all the time by adjusting the fuel usage, and the fume can be stayed for more than 3 seconds, so that the dioxins in the fume are completely decomposed; and after being subject to secondary heating, the fume enters the convective region from the hearth to be processed in a convective heat exchange mode, and is discharged through the vertical shaft flue and the fume outlet on the tail of the vertical shaft flue. The invention has the advantages of obvious effects on inhibiting and eliminating dioxins, low operating cost and simple technological operation.

Description

technical field [0001] It belongs to the field of environmental protection, and relates to a device using garbage as fuel, in particular to a boiler for burning garbage. technical background: [0002] At present, incineration is used to treat garbage in the world, and grate furnaces are mostly used. The garbage is directly burned in the furnace, and the furnace temperature is not easy to control during the combustion process. When the furnace temperature is lower than 800°C, especially around 400°C , due to the incomplete combustion of chlorine-containing waste, it is very easy to generate dioxins, which are extremely toxic; the conventional method of purifying flue gas is to use electrostatic precipitators or cyclone separators or wet-type, dry-type dust collectors or organically cooperate with several types of dust collectors. The flue gas is treated, and then discharged into the atmosphere through the chimney. These methods cannot effectively remove dioxins. Separated fr...

AI Technical Summary

Problems solved by technology

Although this method can reduce the outward discharge of harmful substances such as dioxins, the disadvantages of this method are: a. In the initial stage of waste incineration and the late stage of flameout, due to the insufficient combustion of waste due to low temperature, the flue gas contains a large amount of dioxin Although dioxins are adsorbed by activated carbon powder, there will still be a large amount of dioxins discharged into the atmosphere; b. The flue gas purification equipment used is relatively large and relatively large, and the harmful substances such as dioxins in the flue gas will be eliminated. It cannot be completely removed, and a relatively large chimney needs to be set up to discharge it outward; c. The cost of using activated carbon powder to absorb dioxins is high, and the activated carbon after use cannot be regenerated, becoming a new source of poison, and must be handled carefully

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