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Method for preventing and treating dioxin in waste lithium battery pyrolysis process

A technology for waste lithium batteries and dioxins, applied in the field of dioxin prevention and control, can solve the problems of not considering dioxin prevention and metallurgy methods, excluding dioxins, etc., and achieve the effect of suppressing dioxin production

Pending Publication Date: 2022-04-15
HUNAN JIANG YE MECHANICAL & ELECTRICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the recycling process of domestic waste lithium batteries does not consider the prevention and treatment of dioxins produced during the pyrolysis process, and the environmental protection treatment system for waste gas generated during the pyrolysis process does not include the prevention and treatment of dioxins.

Method used

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  • Method for preventing and treating dioxin in waste lithium battery pyrolysis process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The ternary waste lithium battery is passed into the pyrolysis furnace in a broken form for pyrolysis, and the nitrogen gas is controlled to pass through the pyrolysis furnace, so that the environment of the pyrolysis process is in an oxygen-poor state, and the waste gas generated during the pyrolysis process is sent to the environmental protection treatment system, using high pressure Spray into the incinerator, use natural gas to support combustion when starting the furnace, control the combustion temperature at 900°C, and at the same time, spray the oxygen-enriched gas produced by the nitrogen-making mechanism into the incinerator at high pressure, and the oxygen-enriched gas forms a flame vortex together with the exhaust gas , fully mixed and burned, the burning time is more than 2 seconds. After incineration, the flue gas passes through the heat exchanger, and the temperature of the flue gas drops to 630°C, and then the flue gas passes through the quenching tower, a...

Embodiment 2

[0030] The lithium iron phosphate waste lithium battery is passed into the pyrolysis furnace for pyrolysis by shell shearing, and the nitrogen gas is controlled to pass through the pyrolysis furnace, so that the environment of the pyrolysis process is in an oxygen-poor state, and the waste gas generated during the pyrolysis process is transported to the environmental protection treatment system. It is sprayed into the incinerator in a high-pressure way, and natural gas is used to support combustion when the furnace is turned on, and the combustion temperature is controlled at 930°C. At the same time, the oxygen-enriched gas produced by the nitrogen-making mechanism at the same time is injected into the incinerator in a high-pressure way, and the oxygen-enriched gas is formed together with the exhaust gas. The flame is vortex, fully mixed and burned, and the burning time is more than 2 seconds. After incineration, the flue gas passes through the heat exchanger, the temperature o...

Embodiment 3

[0033] Pass the 3C waste lithium battery into the pyrolysis furnace as a whole for pyrolysis, control nitrogen to pass through the pyrolysis furnace, make the pyrolysis process environment in an oxygen-poor state, and the waste gas generated during the pyrolysis process is sent to the environmental protection treatment system, and sprayed with high pressure In the incinerator, natural gas is used to support combustion when the furnace is turned on, and the combustion temperature is controlled at 950°C. At the same time, the oxygen-rich gas produced by the nitrogen-making mechanism and nitrogen is injected into the incinerator at high pressure. The oxygen-rich gas forms a flame vortex together with the exhaust gas. Combustion occurs when fully mixed, and the combustion time is more than 2 seconds. After incineration, the flue gas passes through the heat exchanger, the temperature of the flue gas drops to 650°C, and then the flue gas passes through the quenching tower, and the qu...

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Abstract

The invention provides a method for preventing and treating dioxin in a waste lithium battery pyrolysis process. In the pyrolysis process of the waste lithium battery, inert gas is introduced to enable the pyrolysis process to be in an oxygen-deficient state, then waste gas generated by pyrolysis is sprayed into an incineration chamber, natural gas is sprayed to support combustion, the combustion temperature is controlled to be 850-1100 DEG C, meanwhile, oxygen-enriched gas is sprayed to form flame vortex with the pyrolysis waste gas, and the oxygen-enriched gas and the pyrolysis waste gas are fully mixed in the incineration chamber to generate oxidation reaction; and dioxin generated by pyrolysis is decomposed. And then flue gas discharged from the incineration chamber passes through a heat exchanger, the temperature is reduced to 600-700 DEG C, then the flue gas is introduced into a quench tower to be quenched, the flue gas is quenched to 200 DEG C or below, the quenching time is shorter than 1 second, and regeneration of dioxin is restrained. According to the method, the nitrogen making machine is used for producing nitrogen, meanwhile, the byproduct oxygen-enriched gas is produced, dioxin generated in the pyrolysis process of the waste lithium batteries is decomposed through oxygen-enriched combustion, the use amount of natural gas is reduced, the cost is relatively low, and the method is suitable for large-scale recycling of the waste lithium batteries.

Description

technical field [0001] The invention relates to the recycling of lithium batteries, in particular to a method for preventing and treating dioxins in the pyrolysis process of waste lithium batteries. Background technique [0002] Dioxin is a general term for a class of polychlorinated oxygen-containing tricyclic aromatic hydrocarbons, with a total of 210 isomers, of which 2,3,7,8-tetrachlorodibenzo-p-dioxin (2,3 ,7,8-TCDD) is the most toxic pollutant known to man so far. Dioxin is a solid with a high melting point, does not react with acid and alkali, is insoluble in water, and is not easy to degrade in the natural environment, but it begins to decompose when heated to 800°C. Dioxin is hardly excreted after entering the organism, and it is easy to accumulate in fat and liver. It is a trace-level carcinogen, so a trace amount of dioxin can also cause significant adverse effects on human health and the ecological environment. [0003] Dioxins come from a wide range of sources...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G5/027F23G5/16F23G5/44F23G7/06F23L7/00F23J15/06
CPCF23G5/027F23G5/16F23G5/44F23G7/06F23L7/007F23J15/06Y02E20/30Y02E20/34
Inventor 甄必波吴光辉王振云
Owner HUNAN JIANG YE MECHANICAL & ELECTRICAL TECH CO LTD
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