Device and method for denitration and treating sludge containing organic matter by utilizing dry-method rotary kiln

Abstract

The invention provides a device and a method for denitration and treating sludge containing organic matter by utilizing a dry-method rotary kiln. The device comprises a dry-method rotary kiln preheater system, wherein the dry-method rotary kiln preheater system comprises a decomposing furnace, a decomposing furnace gooseneck pipe, a five-level cyclone, a four-level cyclone, and a rising channel from the five-level cyclone to the four-level cyclone; the five-level cyclone is communicated with the decomposing furnace by the decomposing furnace gooseneck pipe and is also provided with a sludge tank, a slurry pump and an air cannon group; and a power stirring device or an inflating device is arranged in the sludge tank. The invention also provides the method for denitration and treating sludge containing organic matter by utilizing the dry-method rotary kiln. With the adoption of the device and the method, the production kiln of the dry-method rotary kiln and the combustion of coal powder in the furnace are not affected, the consumption of coal is not increased, the kiln condition and the yield and quality of clinker are not affected, the cost is low, and the environmental protection is realized.

Description

technical field [0001] The invention relates to a device and method for treating sludge containing organic matter, in particular to a device and method for treating sludge containing organic matter in a dry-process rotary kiln that takes denitrification into consideration. Background technique [0002] Municipal sludge and other sludge containing organic matter, such as printing and dyeing factory sludge, generally have a moisture content of 75-85%. In addition to some inorganic substances, they also contain a large amount of organic hydrocarbons and pathogenic microorganisms or toxic and harmful substances. , Harmless disposal is very difficult. [0003] At present, advanced processing technologies at home and abroad can be roughly divided into two categories. One is to dry it as an alternative fuel, especially using the waste heat of the power plant to dry it, but the investment in drying is large, the operating cost is high, and the waste gas treatment is difficult. The...

AI Technical Summary

Problems solved by technology

One is to dry it as an alternative fuel, especially by using the waste heat of the power plant, but the investment in drying is large, the operating cost is high, and the waste gas treatment is difficult

The second type is to use cement kiln for processing, and this type of processing method can be divided into three types: one is to use the waste heat treatment of grate cooler at the kiln head, because it affects the quality of clinker and the water vapor brought into the kiln affects the coal in the kiln. The second is to spray it into an external fluidized bed or an online decomposition furnace for treatment. Due to the excessive low-temperature moisture brought in, it absorbs heat and expands rapidly, affecting the external fluidized bed or decomposition. The pulverized coal burns in the kiln, and affects the ventilation in the kiln and the tertiary air, and the shrinkage is easy to collapse, the coal consumption increases, and it also affects the clinker production quality and the stability of the kiln condition; the third is to spray it into the kiln tail smoke chamber for treatment. Negative effects in the smoke chamber are similar to spraying into the calciner

[0004] CN101886811A discloses a method for co-processing high-moisture sludge with a new type of dry-process rotary kiln, in order to control the amount of moisture brought in by the sludge to be no more than 3% of the amount of raw meal, and try to reduce the amount of coal in the kiln and calciner. The impact of combustion is reduced to an acceptable range, but no matter whether it is free water or combined water, entering the kiln has a great impact on the combustion of pulverized coal; influences

But at present, there is no suitable and cheap hydrogen or hydrocarbons, or substances that can produce hydrogen and hydrocarbons, which can be added to the dry rotary kiln system at the right place to achieve the purpose of denitrification

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