Method and system for recycling waste carbon and increasing heat value of pyrolysis gas

Abstract

The invention relates to a method and system for recycling waste carbon and increasing the heat value of pyrolysis gas. The method comprises the following steps: successively subjecting waste to pretreatment consisting of bag breaking, treatment with a roller screen, sorting, crushing, etc. so as to obtain a raw waste material; treating the raw waste material by using a revolving-bed thermal decomposition furnace so as to obtain substances comprising pyrolytic carbon and pyrolysis oil gas; and treating the pyrolysis oil gas with an energy-saving deacidification device and an oil gas separating and purifying device, and allowing obtained pyrolysis gas and the pyrolytic carbon crushed by a crusher to enter a gasifier for gasification so as to obtain gasified gas, wherein the gasified gas comprises 30 to 35% of CO and contains combustible gases like CO, H2 and CH4. The method and system provided by the invention realize recycling of the pyrolytic carbon and increase the heat value of pyrolysis gas at the same time, and are beneficial for improving the economic benefits of the whole household refuse pyrolysis process.

Description

technical field [0001] The invention belongs to the technical field of solid waste recycling and treatment, and relates to a method and system for recycling garbage charcoal and increasing the calorific value of pyrolysis gas. Background technique [0002] As our country is facing the dual pressure of environment and energy, with the acceleration of economic and urbanization, the national energy consumption is huge. On the one hand, it can alleviate my country's energy and environmental crisis. Domestic waste pyrolysis technology is more and more favored by people because of its high resource utilization rate and low environmental pollution. The main products of domestic waste pyrolysis are as follows: part of the pyrolysis oil can be used as fuel oil after refining; the pyrolysis gas that can be used as fuel gas includes some low molecular hydrocarbons such as hydrogen, methane, carbon monoxide, etc.; Some of them exist in the form of carbon black, but there are toxic and ...

AI Technical Summary

Problems solved by technology

[0007] This invention decomposes domestic and organic solid waste into combustible gas and charcoal under the condition of heating without oxygen, and the combustible gas is directly incinerated, and does not solve the shortcomings of high carbon dioxide content and low calorific value of combustible gas

This system uses domestic waste pyrolytic charcoal as the final product. Due to the low calorific value of pyrolytic charcoal, the market is not smooth, and it contains toxic and harmful substances such as heavy metals. If pyrolytic charcoal is used as the final product, the economic benefit is poor. Promotion is more difficult

[0008] At present, the existing technology does not use carbon dioxide in the pyrolysis gas of domestic waste as a gasification agent, and pyrolytic charcoal as a gasification raw material, so as to realize the comprehensive utilization of pyrolytic charcoal and increase the calorific value of pyrolysis gas

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