Coking inhibitor special for hazardous waste incinerator and preparation method and application thereof

Abstract

The invention relates to a coking inhibitor special for a hazardous waste incinerator and a preparation method and application thereof, and belongs to the technical field of chemistry. The coking inhibitor is simple in component, the melting point of fly ash generated by incineration is increased in the hazardous waste incineration process of magnesium oxide, the number of fly ash molten at the high temperature adhering to the tail of a rotary kiln, a fire grate, a secondary combustion chamber necking opening, the side wall of a horizontal flue and the heated surface is reduced to a certain degree, and therefore the coking rate of an incinerator is reduced. The carbon dioxide generated by the metal carbonate destroys the compact structure of the coke block to form a porous fragile structure, so that the coke block is loose and is in a sandwich shape, the decoking is time-saving and labor-saving, and the influence on equipment and refractory materials is small.

Description

[0001] field of invention [0002] The invention relates to a special coking inhibitor for hazardous waste incinerators, a preparation method and application thereof, and belongs to the field of chemical technology. Background technique [0003] Because hazardous waste is often highly toxic, acidic and corrosive, general incinerators cannot be used to incinerate hazardous waste directly, otherwise it will easily cause vicious pollution incidents and strong corrosion of the furnace body. At present, the rotary kiln incinerator is used at home and abroad to dispose of hazardous waste. The rotary kiln has the characteristics of continuous operation, large feeding flexibility, high technical feasibility, easy operation, and convenient operation and maintenance. [0004] During the incineration process of hazardous waste, the rotary kiln, secondary combustion chamber, and horizontal flue in the rotary kiln incinerator will coke. It will cause forced shutdown and shorten the servic...

AI Technical Summary

Problems solved by technology

[0004] During the incineration process of hazardous waste, the rotary kiln, secondary combustion chamber, and horizontal flue in the rotary kiln incinerator will coke. It will cause forced shutdown and shorten the service life of the incinerator

In order to reduce the coking rate of incinerators, there are currently few coking inhibitors for hazardous waste disposal, most of which are for domestic waste power plants and coal-fired boilers, and most of the coking inhibitors contain SiO 2 , F 2 o 3 , nitrate and other components, if used in the hazardous waste incineration process, SiO 2 It will reduce the melting point of ash in the incinerator, although it will promote melting, it will cause coking, and it may damage the refractory material when the temperature is too high; F 2 o 3 Combined with various metal and non-metal compounds in reducing atmosphere to form hard fayalite, leading to chemical coking; nitrate is thermally decomposed to produce NOx, which is one of the air pollutants

Moreover, the coking inhibitors that can be used in the hazardous waste disposal industry on the market are priced at 8,000-12,000 yuan / ton, which is very expensive and the effect is not obvious

Moreover, the coke blocks formed during the hazardous waste incineration process are strong and cover the surfaces of the rotary kiln, the secondary combustion chamber, and the horizontal flue. Online coke cleaning needs to be beaten with iron rods and extended weights, etc., and the time is as long as 30-60 minutes / Second, it not only affects the normal working conditions, but also affects the service life of equipment and refractory materials

After the furnace is shut down, it is necessary to manually clean the coke with a pick, etc., which takes up to 2 days, with high work intensity, poor environment, and certain safety risks.

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