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Method for high-temperature alkalization treatment of solid hazardous waste and co-treatment in a cement kiln

A co-processing and cement kiln technology, which is applied in cement production, preheating costs, lighting and heating equipment, etc., can solve problems such as increased heat consumption, clogging of kiln tail smoke chamber accumulation, and aggravated reduction skin in the smoke chamber

Active Publication Date: 2020-10-27
长沙紫宸科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] (3) The incineration method of feeding materials into the grate cooler in the kiln hood, that is, putting the combustible waste directly into the grate cooler for incineration, which will easily affect the cooling quality of the clinker, and reduce the secondary air entering the kiln and the tertiary air entering the furnace. Oxygen concentration affects pulverized coal combustion and kiln conditions in kilns
The common defects of this kind of method: First, it is easy to cause the accumulated material in the kiln tail smoke chamber to stick and block
The second is that the heavy metals in the solid waste are not reduced, inhibited and pre-cured, which will easily cause the reduction and volatilization of heavy metals and the volatilization of chlor-alkali sulfur, which will aggravate the crusting of smoke chambers and shrinkage, affect the stability of kiln conditions, and increase heat consumption.
The third is that there is no transitional reduction and inhibition treatment for combustibles such as carbon-containing organic matter and sulfides in solid waste. The combustibles will aggravate the reduction crust of the smoke chamber and shrinkage
[0018] Obviously, the existing carbon-containing organic hazardous waste technology is insufficient as an alternative fuel, especially the hydrocarbon hazardous waste liquid containing heavy metals is only satisfied with being directly sprayed from the kiln head into the kiln for incineration. In fact, heavy metals, especially heavy metals that are easy to restore and volatilize, migrate with the hot air into the dust of the humidifying tower and diffuse into the atmosphere; while the hazardous waste liquid with high hydrocarbon content is directly sprayed into the kiln for incineration, and a large amount of water vaporization needs to absorb a large amount of heat first. The timely burnout rate of the first coal, the higher concentration of water vapor will also directly affect the combustion of the tailing coal in the calciner, and increase the probability of powder arching and sticking in the preheater system, increasing the clinker coal consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This example is carried out on a Φ4 × 60m precalcined kiln-dried cement production line with a five-stage cyclone preheater in a certain enterprise. During normal production, the kiln tail smoke chamber, shrinkage, moderate crusting and long rings in the kiln, kiln conditions General stability. The average clinker output under normal kiln conditions is 2678t / d, the actual standard coal consumption of clinker is 110.7kg / t, the vertical lift weight of clinker fluctuates at 1160-1330g / L, the f-CaO fluctuates at 0.5-1.2%, and the clinker strength fluctuates at 3d compressive strength is 24.6-32.4MPa, 28d compressive strength is 52.8-57.6MPa, standard consistency water demand fluctuation is 22.5-27.5%, setting time fluctuation is initial setting 104-137min, final setting 139-168min, chloride ion (Cl - ) content of 0.013%.

[0037] In this example, solid hazardous waste whose warehouse number is HW48 from a hazardous waste treatment company is selected. Sampling and analysis...

Embodiment 2

[0050] This example is carried out on a Φ4.2 × 64m precalcined kiln-dried cement production line with a five-stage cyclone preheater in a certain enterprise. During normal production, the kiln tail smoke chamber, shrinkage, moderate crust and long rings in the kiln , the kiln condition is relatively stable, and a small amount of zongzi yellow reducing materials are mixed in the clinker. The average clinker output under normal kiln conditions is 3189t / d, the actual standard coal consumption of clinker is 108.5kg / t, the vertical lift weight of clinker fluctuates at 1180-1340g / L, the f-CaO fluctuates at 0.5-1.2%, and the clinker strength fluctuates at The 3d compressive strength is 25.6-32.8MPa, the 28d compressive strength is 53.8-58.9MPa, the standard consistency water demand fluctuates at 22-28%, the setting time fluctuates at initial setting 98-130min, final setting 135-168min, chloride ion (Cl - ) content of 0.017%.

[0051] In this example, a hazardous waste disposal compa...

Embodiment 3

[0064] This example is carried out on a Φ4.3 × 64.5m precalcined kiln-dried cement production line with a five-stage cyclone preheater in a certain enterprise. During normal production, the kiln tail smoke chamber, shrinkage, slight skinning in the kiln, and long rings , the stability of the kiln is good, and a small amount of zongzi yellow reducing materials are mixed in the clinker. The average clinker output under normal kiln conditions is 3326t / d, the actual standard coal consumption of clinker is 107.9kg / t, the vertical lift weight of clinker fluctuates at 1180-1330g / L, the f-CaO fluctuates at 0.5-1.2%, and the clinker strength fluctuates at 3d compressive strength is 24.6-33.9MPa, 28d compressive strength is 52.8-59.2MPa, standard consistency water demand fluctuation is 22.5-27.5%, setting time fluctuation is initial setting 100-137min, final setting 133-165min, chloride ion (Cl -) Content 0.009%.

[0065] In this example, a hazardous waste disposal company is selected ...

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Abstract

The invention discloses a method for high-temperature alkalization treatment of solid hazardous waste and co-treatment in a cement kiln. In the pretreatment process of the solid or plastic or slurry hazardous waste, a modification treatment agent is added for modification treatment to serve as a substitute raw material for cement production, and the modified solid hazardous waste is fed into a discharging pipeline at the conical part of a C5 or C6 preheater for high-temperature alkalization and enters a rotary kiln for high-temperature calcination to form clinker minerals. The method is easy to operate, low in investment, low in treatment energy consumption, low in treatment cost and free of secondary pollution. According to the invention, organic matters in the solid hazardous wastes canbe effectively burnt out, silicon-aluminum / calcium inorganic minerals in the solid hazardous wastes are converted into mineral components of the cement clinker, heavy metal and most of alkali are fused through silicon-aluminum root group / silicate group / aluminate group lattices, fluorine, chlorine and sulfur are converted into early-strength calcium fluoroaluminate, calcium chloroaluminate and calcium sulphoaluminate clinker minerals, accumulated materials of a kiln tail smoke chamber are prevented from being stuck and blocked, and cost reduction and efficiency improvement are facilitated.

Description

technical field [0001] The invention relates to a method for recycling solid hazardous waste, in particular to a method for co-processing solid hazardous waste into a cement kiln for high-temperature alkalization treatment. Background technique [0002] Hazardous waste in my country is characterized by a large amount of production, various types, and a wide range of sources. The "National Hazardous Waste List" (2016 Edition) divides hazardous waste into 46 categories, with a total of 479 types. In the past 20 years, my country has established a relatively complete hazardous waste management system, and built a relatively complete hazardous waste disposal facility nationwide, forming a system based on incineration disposal technology, solidification and stabilization technology, and cement kiln co-processing. three types of disposal technologies. At present, the co-processing of hazardous waste in cement kilns has become one of the most important and effective technical appro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24C04B7/42C04B7/43C04B7/44F27B7/20F27B7/32F27D13/00
CPCC04B7/24C04B7/42C04B7/43C04B7/44F27B7/2016F27B7/3205F27D13/002Y02P40/10
Inventor 尹小林余智英宋剑飞
Owner 长沙紫宸科技开发有限公司
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