Household garbage coupling fluidized bed grading pyrolysis gasification technology

Abstract

The invention provides a household garbage coupling fluidized bed grading pyrolysis gasification technology. Household garbage is firstly subjected to deferrization and crushing, then 0-6mmgarbage particles are dried through a casing pipe type rotary drum drying machine, garbage particles and a small quantity of heat carriers are sent to the middle lower portion of an entrained flow reactor to be mixed with gasified gas and circulating ash and lifted up to be performed with hydroforming pyrolysis, after gas-solid separation, first-stage separated high-temperature coarse semi-coke return to the bottom of a coupling fluidized bed to react between 800-1000 DEGC to generate gasified gas, and the gasified gas and the circulating ash together to flow upwards to form material circulation. Second-stage separated high-temperature fine semi-coke is sent to an entrained-flow bed to react between 1200-1600 DEG C to generate high-temperature gas, and the high-temperature gas and liquid ash slag simultaneously flow out of the entrained-flow bed in spiral inclined-downwards mode, and the high-temperature gas go upwards and enter the coupling fluidized bed. The liquid ash slag flows downwards to a circulating ash material layer of a circulating fluidized bed and is subjected to heat exchange to be solidified into solid ash slag. Combustion gas separated from the second stage servers as product gas to be supplied externally.

Description

1. Technical field [0001] The invention provides a staged pyrolysis gasification process coupled with a fluidized bed of domestic garbage, which belongs to the field of environmental protection. 2. Background technology [0002] At present, the treatment methods of urban waste in various countries in the world mainly include classified recycling, landfill, composting and incineration, cracking and gasification. Landfilling requires a large amount of land. At the same time, harmful components in garbage will also cause serious pollution to the atmosphere, soil, and water sources, which not only damages the ecological environment, but also seriously endangers human health; composting requires sorting and classification of garbage, requiring high organic content of garbage. Moreover, composting cannot be reduced, and a large amount of land is still needed. [0003] The essence of incineration is to oxidize organic waste into inert gaseous substances and inorganic non-combusti...

AI Technical Summary

Problems solved by technology

Its advantages are rapid capacity reduction and complete high-temperature harmlessness. It occupies a small area and has heat recovery. However, due to the presence of oxygen, chlorine-containing organic substances in garbage will inevitably produce highly toxic dioxins that are difficult to decompose. , becoming a bottleneck restricting the application of waste incineration

[0004] Domestic waste pyrolysis is a newly developed technology in recent years. It has a high utilization rate of waste resources and no generation of dioxins. However, the composition of oil products is complex, it is difficult to use, and it produces difficult-to-handle phenol water. In addition, fixed-bed technology is mainly used Difficult to achieve large-scale production; domestic waste gasification has a high utilization rate of waste resources, less dioxin formation, but the gas has a low calorific value, tar needs to be removed, and it is difficult to use. At present, it is difficult to achieve large-scale production with fixed bed technology.

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