System and method for treating solid waste

Abstract

The invention discloses a system and a method for treating solid waste. The system comprises a household garbage pretreatment unit, a biomass pretreatment unit, a rubber pretreatment unit, a rotating-bed pyrolyzing furnace, a direct-combustion power generation device and a gasifying device, wherein the household garbage pretreatment unit comprises a household garbage inlet, an inorganic garbage outlet, a stacked filtrate outlet and an organic garbage particle outlet; the biomass pretreatment unit comprises a biomass inlet and a biomass block outlet; the rubber pretreatment unit comprises a rubber inlet and a rubber particle outlet; the rotating-bed pyrolyzing furnace comprises a rubber particle inlet, a biomass block inlet, an organic garbage particle inlet, a rubber pyrolytic carbon outlet, a biomass pyrolytic carbon outlet, an organic garbage pyrolytic carbon outlet and a high-temperature oil gas outlet; the direct-combustion power generation device comprises a high-temperature oil gas inlet; and the gasifying device is provided with a pyrolytic carbon inlet, a pulverized coal inlet and a gasifying coal gas outlet. The system is relatively low in operation cost, and dioxin is not generated in an intermediate process; and meanwhile, high-temperature oil gas and the pyrolytic carbon are efficiently utilized, so that economic benefits are generated.

Description

technical field [0001] The invention belongs to the field of solid waste resource treatment, in particular, the invention relates to a system and method for treating solid waste. Background technique [0002] With the rapid development of economy, the continuous growth of population and the improvement of people's living standards, my country's urban organic solid waste has increased sharply, especially urban domestic waste, rural biomass and waste tire rubber in industrial parks. At present, the annual output of municipal solid waste in China is about 200 million tons, and it is still increasing at a rate of about 10% every year, which has caused a great burden on the environment. Two-thirds of the country's large cities are facing the dilemma of "garbage siege". Rural biomass has become agricultural waste in many places, putting enormous pressure on the environment. In addition, there are more than 200 million waste tires produced in my country, which are receiving more ...

AI Technical Summary

Problems solved by technology

Since pyrolysis itself belongs to an anoxic or anoxic environment, there is basically no dioxin generation under reducing conditions, so the effect of the separation process is not obvious

On the other hand, the heat source for the drying and pyrolysis of domestic waste comes from the combustible gas produced by another agricultural and forestry waste pyrolysis gasification device. Due to energy loss, the pyrolysis temperature is low, so a large amount of pyrolysis oil will be produced, and It is difficult to utilize and process, which will affect the continuous operation of the entire process

On the other hand, this system process adopts pyrolysis technology to process domestic waste and biomass at the same time, and uses two pyrolysis devices. The system is complicated, and the economic benefits of cooperative processing are poor. The amount of flue gas caused by drying is large, and the treatment cost high

Fourth, this method has carried out special drying treatment for domestic waste, resulting in high unit energy consumption

And biomass pyrolysis gas has not been utilized as a resource

Fifth, this system process only deals with domestic waste and agricultural and forestry waste, and the system is complex, and does not consider the treatment of urban industrial waste tires and rubber. The comprehensive treatment capacity of the whole system process is not strong, and it is difficult to promote industrialization

[0010] On the one hand, the pretreatment process of this method is complicated. Since the garbage contains many metals and cloth bags, it is easy to affect the crushing device, so the continuous operation of the device is not effective. The material after extrusion and granulation has high density and slow heat and mass transfer. During the pyrolysis process, the yield of pyrolysis oil will increase and the yield of pyrolysis gas will decrease, which is not conducive to the subsequent utilization of power generation

On the other hand, this system process only performs pyrolysis treatment for urban domestic waste, without considering biomass and industrial waste tires and rubber in urban industrial parks. The utilization rate of the system device is insufficient, and the economic benefits are not obvious

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