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A method for co-resource utilization of urban solid waste and carbon dioxide

A carbon dioxide, recycling technology, applied in gasification process, combustible gas purification, removal of gas pollutants, etc., can solve the high pyrolysis and gasification reaction rate of waste-derived fuel, waste incineration power generation processing capacity can not meet the requirements, The problem of high cost of secondary pollutant treatment can achieve the effect of rapid and efficient gasification and melting, reducing the NIMBY effect and reducing the difficulty of site selection.

Active Publication Date: 2022-01-28
UNIV OF SCI & TECH BEIJING
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AI Technical Summary

Problems solved by technology

This method uses a fluidized bed to solve the problems of uneven mixing and incomplete reaction in a fixed bed, but the particle size of 30 mm cannot guarantee a high pyrolysis and gasification reaction rate for waste-derived fuels
The generated pyrolysis gas will contain pollutants such as tar and polycyclic aromatic hydrocarbons, which will increase the cost of gas purification
[0014] With the development of my country's urbanization and the improvement of people's living standards, the generation of urban solid waste has increased year by year, and the phenomenon of garbage siege has appeared. The existing waste incineration power generation processing capacity cannot meet the requirements, and there are large investment, secondary Due to the high cost of pollutant treatment, it is urgent to develop a new type of urban solid waste treatment technology, take multiple measures, and strive to form a situation of multi-technical processes and multi-industry collaboration

Method used

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  • A method for co-resource utilization of urban solid waste and carbon dioxide

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Experimental program
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Effect test

Embodiment 1

[0047] For the mixed solid waste collected by the urban sanitation system (pre-removed kitchen waste), the waste sorting system separates recyclables, bricks and tiles, harmful substances, etc., and the remaining part is mixed and sent to the shear crusher for coarse crushing When the particle size is less than 50mm, the crushed material is sent to a low-temperature heating device for heating. The heating is carried out under an inert protective atmosphere. The heating temperature is 400°C, and the heating time is 50 minutes, and then cooled. The whole process completes the removal of moisture and the improvement of brittleness. The cooled material is crushed and screened by a high-speed shear crusher to obtain finely divided materials with a particle size of less than 1.0 mm. The sensible heat of the crude synthesis gas is recovered by a heat exchanger and the oxygen-carbon dioxide mixture is preheated. After preheating, the temperature of the mixed gas reaches 500°C, and the ...

Embodiment 2

[0049] For other garbage collected by the urban sanitation system that adopts the "four-point method", bricks, tiles, metals, etc. are removed through the garbage classification system, and the remaining part is mixed and sent to the shear crusher for coarse crushing until the particle size is less than 50mm. In order to co-dispose wastes in rural and forestry areas, agricultural and forestry wastes are added to urban solid wastes. Agricultural and forestry wastes also need to be coarsely crushed and mixed with coarsely crushed urban solid wastes. The proportion of agricultural and forestry wastes 10%. The mixed coarsely crushed material is sent to a low-temperature heating device for heating. The heating is carried out under an inert protective atmosphere. The heating temperature is 350°C, and the heating time is 60 minutes. The material is crushed and screened by a high-speed shear crusher to obtain finely divided materials with a particle size of less than 1.0 mm. The sens...

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Abstract

The invention relates to the technical field of resource utilization of urban solid waste, in particular to a method for co-resource utilization of urban solid waste and carbon dioxide, in which oxygen-carbon dioxide mixed gas is used as an oxidant to carry out parallel combustion and gasification with finely crushed urban solid waste The reaction produces slag and synthesis gas, thereby realizing the co-resource utilization of urban solid waste and carbon dioxide. Municipal solid waste is put into the furnace in the state of fine powder for gasification, which improves the reaction rate, ensures the stability of the reaction in the furnace, and reduces the generation of dioxins. At the same time, through high temperature and high pressure operation, the inorganic substances in urban solid waste It melts into slag and forms a glass state after quenching, which realizes the solidification of heavy metals, reduces the leaching rate of heavy metal elements, and provides the possibility for the resource utilization of residues.

Description

technical field [0001] The invention relates to the technical field of resource utilization of urban solid waste, in particular to a method for resource utilization of urban solid waste and carbon dioxide. Background technique [0002] At present, the usual treatment methods for urban solid waste (except kitchen waste) in my country are landfill and incineration for power generation, which has caused problems such as groundwater pollution, waste of land resources, and NIMBY effect. [0003] The natural resources on the earth are limited, but the needs of human society are unlimited. Therefore, in order to achieve sustainable development of human society, the circulation of material resources must be strengthened. The recycling of urban solid waste is of great significance. Urban solid waste contains a large amount of carbon and hydrogen components, which come from waste plastics and biomass. Waste plastics are mainly produced from two fossil fuels, oil and natural gas. Thro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/56C10J3/57C10J3/72C10K1/02C10K1/00C10K1/04
CPCC10J3/56C10J3/57C10J3/72C10K1/02C10K1/04C10K1/002C10K1/004C10J2300/0946C10J2300/0953C10J2300/0943C10J2300/0959
Inventor 王广张宏强王静松薛庆国
Owner UNIV OF SCI & TECH BEIJING
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