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Catalytic pyrolysis gasification method of urban garbage

A municipal waste, pyrolysis gasification technology, applied in gasification process, fixed bed gasification, granular/powdered fuel gasification, etc., can solve the problems of equipment corrosion, catalyst loss, etc., achieve low corrosion, reduce gas The effect of melting temperature and avoiding melting and slagging

Active Publication Date: 2017-04-26
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Alkali metal catalyst is an excellent catalyst for catalytic gasification, the traditional alkali metal catalyst Na 2 CO 3 、K 2 CO 3 , KOH, etc., due to the low melting point, some alkali metals will volatilize into the gas phase under high temperature conditions, and the alkali metals volatilized into the gas phase will adhere to the surface of the equipment, which will cause certain corrosion to the equipment and also cause catalyst degradation. drain

Method used

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  • Catalytic pyrolysis gasification method of urban garbage

Examples

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Embodiment 1

[0031] Embodiment 1: In this embodiment, municipal waste is used as a sample, sodium aluminate and sodium silicate are used as catalysts, and a fixed-bed gasifier is used to load the catalyst on the municipal waste through a solution impregnation method. The main components of the waste are shown in Table 1.

[0032] Table 1. Main components of garbage

[0033] waste paper plastic timber clothes food residue other 15.3％ 21.1％ 7.3％ 8.1％ 41.2％ 7％

[0034] The catalyst loading steps are as follows:

[0035] 1) The mass ratio of sodium aluminate to sodium silicate is 1, the mass ratio of water to sodium aluminate is 40, the mass ratio of water to sodium silicate is 40, and the mixture is stirred at 60°C until completely dissolved;

[0036] 2) The mass of the alkali metal element Na is 1wt% of the mass of urban waste, and the pulverized urban waste is added to the solution, stirred and kept at temperature until a slurry-like substance is formed;

...

Embodiment 2

[0039] Example 2: In this example, municipal waste was used as a sample, sodium aluminate was used as a catalyst, and sodium aluminate was loaded onto municipal waste through a mechanical mixing method using a fluidized bed gasifier. The main components of the waste are shown in Table 1.

[0040] The catalyst loading steps are as follows:

[0041] The mass of the alkali metal element Na is 5wt% of the mass of the urban waste. The sodium aluminate and the urban waste are mixed and put into a vibrating pulverizer, and taken out after grinding for 5 minutes to obtain the catalyst-loaded urban waste prepared by the mechanical mixing method.

[0042] Take municipal waste loaded with sodium aluminate and add it to a fluidized bed gasifier for gasification. The mass of alkali metal element Na is 5wt% of the mass of municipal waste, the pressure is 3MP, the gasification temperature is 1000°C, and the gasification agent is air and water. Steam, air / municipal waste mass ratio is 4, wate...

Embodiment 3

[0043] Embodiment 3: In this embodiment, municipal waste is used as a sample, potassium aluminate is used as a catalyst, and an entrained bed gasifier is used to load potassium aluminate onto municipal waste by spraying. The main components of the waste are shown in Table 1.

[0044] The catalyst loading steps are as follows:

[0045] 1) The mass of the alkali metal element K is 8wt% of the mass of urban waste, and the catalyst solution is prepared with a mass ratio of water to potassium aluminate of 20, and heated to 80°C;

[0046] 2) Spray the prepared solution on the municipal waste in the form of spray, and dry at 80° C. for 12 hours to obtain the catalyst-loaded municipal waste.

[0047]Take the municipal waste loaded with potassium aluminate and put it into an entrained bed gasifier for gasification. The load of alkali metal K is 8wt%, the pressure is 5MP, the gasification temperature is 1200°C, the gasification agent is oxygen and water vapor, and the oxygen / The mass ...

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Abstract

The invention relates to a garbage treatment method which comprises the following specific steps: loading urban garbage with the aluminate and silicate of an alkali metal with a high melting point and low volatility at a certain loading capacity; pyrolyzing at 300-900 DEG C; gasifying at 800-1,200 DEG C to obtain catalyst-containing gasified residues; and washing to realize catalyst recycling. The aluminate and silicate of the alkali metal are applied to the catalytic gasification treatment of urban garbage; and the catalyst has the advantages of good catalysis property, low volatility at high temperature, little equipment corrosion, high ash melting temperature and simplicity in recycling.

Description

technical field [0001] The invention belongs to the field of urban garbage treatment, and in particular relates to a method for catalytic pyrolysis and gasification of urban garbage. Background technique [0002] In recent years, with the rapid development of urbanization and urbanization, the output of urban domestic waste has increased dramatically, and the environmental pollution caused by urban waste has become an urgent problem to be solved in various large and medium-sized cities. At present, most of the garbage in our country is disposed of by landfill, composting, and burning. However, landfilling and composting waste treatment methods have problems such as large area, easy to cause secondary pollution, and pollute groundwater. Burning is an efficient and fast way. However, pollutants such as dioxins produced during the combustion process are likely to cause secondary harm to the environment. Therefore, it is necessary to explore an efficient and environmentally frie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/02C10J3/46C10J3/54
CPCC10J3/02C10J3/463C10J3/466C10J3/54C10J2300/0946C10J2300/0956C10J2300/0959C10J2300/0969C10J2300/0976Y02P20/584
Inventor 王志青梅艳钢黄戒介房倚天董立波王志宇赵建涛李春玉张永奇李莉
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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