Waste gasification combined heat and power system with flue gas circulation

Abstract

The invention discloses a waste gasification combined heat and power system with flue gas circulation. The system comprises a primary waste pretreatment system, wherein a primary waste material bin ofthe primary waste pretreatment system is divided into two paths, one path is connected to a waste leachate treatment system, and the other path is connected to a gasification furnace of a waste gasification synthesis system through a drying screening module, the waste leachate treatment system and the waste gasification synthesis system are all connected to a waste ash treatment system; the wastegasification synthesis system is further connected to a synthesis gas heat exchanger of a synthesis gas waste heat utilization system through a synthesis gas purification system, the synthesis gas purification system is connected to a flue gas purification and waste heat system through a synthesis gas power generation system to realize the waste gasification combined heat and power, and the fluegas purification and waste heat system is connected to the gasification furnace through a flue gas circulation system to realize flue gas circulation. According to the waste gasification combined heatand power system with flue gas circulation, the waste gasification process and the gasification synthesis gas purification process are optimized, and finally the requirements of the waste gasification power generation and heat supply are met; and the energy utilization efficiency of the whole system is further improved.

Description

technical field [0001] The invention belongs to the technical field of garbage reduction and harmless treatment, and in particular relates to a garbage gasification combined heat and power system with flue gas circulation. Background technique [0002] At present, the total amount of garbage removal in my country is about 179 million tons per year. Due to the low level of treatment technology, a large amount of garbage is only transported to the suburbs of cities or urban-rural junctions for random stacking or simple landfill. my country's modernization process and urbanization development. [0003] Sanitary landfill and stacking are the main treatment methods of garbage in my country at present, accounting for 88% of the total garbage treatment in my country, but these two methods have neither achieved "harmless" garbage, nor achieved "resource" and "Reduction". As far as the current research is concerned, the heat utilization method represented by waste incineration techno...

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Problems solved by technology

[0006] 2) Disposal of domestic waste by incineration is easy to cause secondary pollution

Waste incineration fly ash is a hazardous waste, which contains a large amount of heavy metal elements such as Pb, Cr, and Cd, which is very harmful to the environment and must be properly disposed of. Currently, cement curing, chemical pickling and other methods are usually used. High cost and incomplete treatment

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