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Multistage burning method and system for gasification of refuse and co-fusion of charcoal ash in rotary kiln

A technology of rotary kiln and garbage, applied in the direction of combustion method, incinerator, combustion type, etc., can solve the problem that the fly ash source cannot be effectively eliminated, does not involve any fly ash source, unfavorable metal resource recovery, etc., and achieves good adaptability and operability, reduce the cost of flue gas treatment, improve the effect of sealing effect

Inactive Publication Date: 2005-01-19
TSINGHUA UNIV +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] Chinese Patent No. 97202456.5 Patented Technology "Rotary Kiln Type Waste Incinerator", and Chinese Patent No. 00111640.1 Patented Technology "Using Cement Rotary Kiln to Treat Hazardous Wastes" belong to this type of traditional rotary incineration technology. Insufficient local combustion can lead to high carbon content in the bottom ash, and cannot effectively eliminate the source of fly ash that acts as a catalyst for dioxin formation
However, the Chinese Patent No. 01256698.5 patented technology "Waste Rotary Kiln Incinerator" can partially improve the combustion carbon conversion rate, but it does not involve any control of fly ash sources related to the generation of dioxins.
In addition, another disadvantage of these patented technologies is that the high temperature environment (about 900°C) in the rotary kiln is not only not conducive to the recovery of metal resources such as Fe, Cu and Al, but also easily causes the volatilization of harmful heavy metals

Method used

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  • Multistage burning method and system for gasification of refuse and co-fusion of charcoal ash in rotary kiln
  • Multistage burning method and system for gasification of refuse and co-fusion of charcoal ash in rotary kiln
  • Multistage burning method and system for gasification of refuse and co-fusion of charcoal ash in rotary kiln

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Embodiment 1

[0032] Embodiment 1 (operation mode of gasification+melting combustion)

[0033]This embodiment realizes the gasification in the kiln body 1 of the rotary kiln gasification furnace (the air coefficient is 0.3 to 0.5, usually 0.4), and the gas, residual charcoal and fly ash are generated in the combustion chamber 19 of the downward high-temperature melting combustion furnace undergo melting combustion.

[0034] Such as figure 1 As shown, the steps are as follows: (1) the preliminary crushed garbage (particle size <20cm) enters the kiln body 1 through the hopper 2, the hydraulic valve 3, the piston feeder 4, and finally enters the kiln body 1 through the garbage inlet 5; Fuel is fed from the fuel nozzle 12 at the end of the kiln body 1, and the primary air is injected by the primary fan 15 through the primary tuyere 16. After starting, the fuel can be reduced or even shut down according to the temperature in the furnace; (3) garbage in the furnace and reverse high-temperature s...

Embodiment 2

[0035] Embodiment 2 (operation mode of initial combustion + high temperature melting type supplementary combustion)

[0036] What this embodiment achieves is combustion in the kiln body 1 of the rotary kiln gasification furnace (the air coefficient is 1.2), to generate flue gas and fly ash, and then enter the combustion chamber 19 of the downward-type high-temperature melting combustion furnace for supplementary combustion and melting.

[0037] The same part of this embodiment and the previous embodiment will not be described again, the difference lies in the step (5) described in Embodiment 1. Since this embodiment produces very little carbon residue during the combustion process, and it is mainly concentrated in fine carbon, it is only necessary to collect fine carbon below 1 mm, and there is no need for a crushing process of residual carbon. After collection, the fine carbon can be directly sent to high-temperature melting In the combustion chamber 19 of the combustion furn...

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Abstract

A charcoal-ash interfusion multistage burning method and system for rotary kiln refuse gasification relates to environmental protection technical field. The method comprises: loading the broken and compacted refuse in a kiln-gas gasifier; implementing partial heat release gasification after the refuse counter current contacting heating with high temperature fume; generating waste gas with lower calorific value entering a high temperature melt type combustion furnace; separating metal monomer by sorting unit after elimination of solid bottoms in the kiln-gas gasifier; grinding other charcoal components, pneumatically conveying them in the high temperature melt type combustion furnace, and making them melting and burning with gas; discharging water quenched slag; and chilling discharged fume after heat recovery by a waste heat boiler, and discharging it into the air via dry purification. The invention not only fundamentally eliminates fly ash source which acts as a catalyst in dioxin and heavy metal formation reaction, but also increases efficiency of carbon conversion of system combustion without increasing energy consumption basically. At the same time, the invention also implements metal resource monomer recovery.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a rotary kiln gasification melting multi-stage incineration technology for medical waste, halogen waste, sewage sludge, polluted soil and other hazardous waste. Background technique [0002] Random storage or improper disposal of various toxic and hazardous wastes such as medical waste and halogen waste will cause serious pollution to water, air and soil, thus posing a direct threat to human health and the environment. With the increasing economic development, the output of hazardous waste has also increased sharply. Taking Beijing as an example, the output of medical waste alone was 2,738 tons in 1996, while the total amount of 20 kinds of hazardous waste in 1998 was as high as 183,000 tons. Therefore, various hazardous waste disposal technologies including incineration technology have attracted increasing attention. [0003] The incineration technology based o...

Claims

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Application Information

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IPC IPC(8): F23G5/02F23G5/027F23G5/20F23G5/46F23J15/00
Inventor 李水清姚强奚波赵旭东刘惠永项光明
Owner TSINGHUA UNIV
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