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Organic solid waste self-maintaining smoldering treatment method based on in-furnace catalytic oxidation

A technology of catalytic oxidation of organic solid waste, applied in the direction of combustion methods, incinerators, combustion types, etc., can solve the problems of increasing the complexity of the process system and implementation cost, improving flue gas purification, and high combustible gas components, so as to reduce smoke Gas purification requirements, realization of transmission rate, and the effect of process optimization

Active Publication Date: 2021-04-13
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current smoldering technology has the characteristics of combustion in the lower part of the process, pyrolysis in the upper part, and continuous transfer from bottom to top, resulting in high levels of combustible gas components such as carbon monoxide in the exhaust gas, which need to be purified and discharged into the atmosphere
At the same time, the current catalytic oxidation flue gas treatment technology mainly uses the temperature rise or the residual temperature of the flue gas to catalyze and oxidize the combustible flue gas components in the waste after the flue gas is discharged from the furnace body, and then achieve the purpose of purification. However, due to the smoldering disposal technology The flue gas temperature is low (<80°C) and the humidity is high (about 80% to 90%), which increases the technical difficulty of the existing technology for flue gas purification in the smoldering disposal process, and improves the overall complexity and realization of the process system. cost

Method used

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  • Organic solid waste self-maintaining smoldering treatment method based on in-furnace catalytic oxidation
  • Organic solid waste self-maintaining smoldering treatment method based on in-furnace catalytic oxidation

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The municipal sludge with a water content of 80% is disposed of through a smoldering device, and the sludge, sand, and platinum-supported catalyst (particle size 1mm to 2mm) are uniformly mixed by physical stirring at a mixing ratio of 20%, 76%, and 4%. Send it into the smoldering reaction device through the feeder, and then turn on the heating. When the temperature of the bottom layer of mixed material reaches 250°C, start the air supply. The Darcy flow rate of the air in the furnace is 3.5cm / s. After about 20 minutes of air supply, turn off the heating. Continue the air supply until all the filling materials in the furnace are disposed of, that is, the temperature of the uppermost layer of the filling materials in the furnace reaches above 350°C. By adding a catalyst, the concentration of carbon monoxide in the flue gas can be reduced by about 78%, and the smoldering reaction rate can be increased by about 18%.

Embodiment 2

[0036] The municipal sludge with a water content of 80% is disposed of by a smoldering device, and the sludge, sand, and manganese-cobalt catalysts (0.5 mm to 1 mm in particle size) loaded on diatomaceous earth or alumina particles are mixed with 14.3%, 81.4%, 4.3 The mixing ratio of % is uniformly mixed by physical stirring, and after mixing, it is sent to the smoldering reaction device through the feeder, and then the heating is turned on. When the temperature of the mixed material at the bottom layer reaches 280°C, the air supply is started, and the Darcy flow rate of the air in the furnace is 4.5 cm / s, turn off the heating after supplying air for about 10 minutes, and continue to supply air until all the filling materials in the furnace are disposed of, that is, the temperature of the uppermost layer of filling materials in the furnace reaches above 350°C. By adding the catalyst, the concentration of carbon monoxide in the flue gas can be reduced by about 65%, and the smold...

Embodiment 3

[0038] Dispose of municipal sludge with a water content of 90% through a smoldering device, mix sludge, sawdust, sand, copper dichromate catalyst (particle size 0.5mm ~ 1.2mm) with 16%, 4%, 60%, 20% The ratio is uniformly mixed by physical stirring, and after mixing, it is sent to the smoldering reaction device through the feeder, and then the heating is turned on. When the temperature of the bottom mixed material reaches 300°C, the air supply is started, and the Darcy flow rate of the air in the furnace is 3.0cm / s , Turn off the heating after supplying the air for about 30 minutes, and continue to supply the air until all the filling materials in the furnace are disposed of, that is, the temperature of the uppermost layer of the filling materials in the furnace reaches above 350 °C. By adding a catalyst, the concentration of carbon monoxide in the flue gas can be reduced by about 76%, and the smoldering reaction rate can be increased by about 15%.

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Abstract

The invention belongs to the field of solid waste treatment, and particularly discloses an organic solid waste self-maintaining smoldering treatment method based on in-furnace catalytic oxidation. The method comprises the following steps of: taking a mixture of organic solid waste, a porous medium material and a catalyst as a packed bed material in a smoldering furnace, then starting to heat, and introducing air into the smoldering furnace, wherein organic solid waste mixed in the porous medium material is subjected to smoldering reaction, and unburnt smoke generated by the smoldering reaction continues to be subjected to oxidation reaction with residual oxygen under the action of the catalyst when passing through a pyrolytic reaction layer above a smoldering reaction surface, so that the waste gas content of the smoldering reaction is reduced, and smoldering treatment of the organic solid waste is completed. According to the organic solid waste self-maintaining smoldering treatment method based on the in-furnace catalytic oxidation, a catalytic oxidation technology and a smoldering technology are organically combined, the smoldering treatment reaction process is improved, and meanwhile, further oxidation of combustible gas components in the self-reaction process is improved, smoke pollution emission is reduced, and the smoldering organic solid waste treatment process is optimized.

Description

technical field [0001] The invention belongs to the field of solid waste disposal, and more specifically relates to a method for self-sustaining smoldering disposal of organic solid waste based on catalytic oxidation in a furnace. Background technique [0002] Organic solid waste includes organic solid waste with high water content and low calorific value, such as kitchen waste, oilfield sludge, municipal sludge, river sludge, oily soil, biogas residue, etc. At present, traditional organic solid waste such as domestic waste is mainly disposed of by incinerators. However, organic solid waste with high water content and low calorific value does not meet the conditions for direct incineration in traditional incinerators due to its own characteristics. The incineration process is often difficult to burn, or it is necessary to increase the combustion temperature by adding fuel with high calorific value, which increases process costs. [0003] Smoldering disposal is a new type of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G5/027F23G5/44F23G5/50F23G7/07
CPCF23G5/027F23G5/444F23G5/50F23G7/07
Inventor 乔瑜冯超黄经春高翔鹏徐明厚
Owner HUAZHONG UNIV OF SCI & TECH
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