Small and medium-sized household waste graded rapid pyrolysis gasification gas production device

Abstract

The invention provides a small and medium sized fuel gas production device based on household refuse grading and flash pyrolysis and gasification. The small and medium sized fuel gas production device comprises an iron-removal pulverizer, a riser, a circulating fluidized bed, a gas distributor, an ash discharging pipe, a gas inlet pipe, a feed inlet, a first-stage gas and solid separator, a coarse ash circulating pipe, a back feeder, a second-stage gas and solid separator, a fine ash circulating pipe, an entrained-flow bed, a fuel gas outlet, an air heat-exchanger and the like. The iron-removal pulverizer and the riser are arranged at the front end of the circulating fluidized bed sequentially; the gas distributor and the ash discharging pipe are arranged at the bottom of the circulating fluidized bed; the entrained-flow bed is arranged at the position which is 1000-2000 mm away from the bottom of the circulating fluidized bed; an oil gas inlet is arranged at the position which is 500-3000 mm away from the entrained-flow bed; the second-stage gas and solid separator is arranged at the top of the circulating fluidized bed; a coarse-particle ash circulating pipe of the first-stage gas and solid separator is connected to the bottom of the circulating fluidized bed, and a fine-particle ash circulating pipe of the first-stage gas and solid separator is connected to the entrained-flow bed through the back feeder; and a gas outlet is connected with the fuel gas outlet through the air heat exchanger.

Description

[0001] 1. Technical field [0002] The invention provides a small and medium-sized domestic garbage graded rapid pyrolysis gasification gas production device, which belongs to the field of environmental protection equipment. [0003] 2. Background technology [0004] 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. [0005] The essence of incineration is to oxidize organic waste into inert gaseous s...

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

[0006] 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.

[0007] The domestic garbage coupled fluidized bed graded pyrolysis gasifier (CN201220525246) of the inventor not only solved the fly ash problem of fluidized bed gasification, eliminated dioxin and peculiar smell from the source, but also rationally used heat energy to obtain high Methane-containing gas, while the gas does not contain tar and does not produce phenol water, but due to the low drying efficiency of the sleeve-type tumble dryer and the high water content of the garbage, it affects the temperature and heating rate of the rapid pyrolysis of the garbage in the presence of hydrogen. Reduced calorific value of gas

In addition, there are also defects such as the difficulty in carrying the water vapor generated by the casing drum dryer to the bottom of the fluidized bed as a gasification agent, the difficulty in high-temperature and low-speed dynamic sealing of the synthesis gas casing, and the difficulty in handling the large amount of leachate.

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