Revolving-bed pyrolysis furnace and method for treating garbage

Abstract

The invention relates to a revolving-bed pyrolysis furnace and a method for treating garbage. The revolving-bed pyrolysis furnace is provided with a drying pyrolysis region, a gasifying region and a combustion region, wherein a transition region with low top pressure is arranged between every two regions; an inner furnace wall and an outer furnace wall are provided with a plurality of radiant tubecombustors, and each radiant tube combustor is provided with a fuel hole and a smoke gas hole; a pyrolysis material inlet and a pyrolysis oil-gas outlet are formed in the top of the drying pyrolysisregion, and a pyrolytic carbon outlet is formed in the bottom of the drying pyrolysis region; a gasified gas outlet is formed in the top of the gasifying region, and an air gasifying agent and a watervapor inlet are formed in the bottom of the gasifying region; the gasified gas outlet is connected with the fuel holes; a smoke gas outlet is formed in the top of the combustion region, and an air inlet and an ash outlet are formed in the bottom of the combustion region; the smoke gas holes of the radiant tube combustors communicate with the smoke gas outlet; and the smoke gas outlet is connectedwith the air gasifying agent inlet. The revolving-bed pyrolysis furnace realizes that one furnace body completes drying, pyrolysis, gasifying and oxidizing of garbage, shortens process flow, reducesequipment investment, and increases a heat utilization rate.

Description

technical field [0001] The invention relates to the field of solid waste resource treatment, in particular to a rotary bed pyrolysis furnace and a method for treating waste. Background technique [0002] With the acceleration of economic and urbanization, the continuous growth of population and the continuous improvement of living standards, my country's energy consumption is huge, and the amount of domestic waste is also increasing rapidly. At present, two-thirds of large cities are facing the dilemma of garbage siege. Through technical means It is a very important topic to turn domestic garbage into usable resources and alleviate the energy and environmental crisis in our country. Municipal solid waste has a wide range of sources and complex components, which brings great difficulties to waste disposal. [0003] Domestic waste pyrolysis technology is more and more favored by people because of its high resource utilization rate and low environmental pollution. The main pro...

AI Technical Summary

Problems solved by technology

Among them, this technology has the following disadvantages: (1) The garbage charcoal after pyrolysis is in a high-temperature thermal state, and this part of the heat is not recovered; (2) The gasification of garbage charcoal requires a separate gasification bed, which requires high investment costs and is not applicable It is suitable for small-scale waste treatment plants; (3) After pyrolysis, the waste charcoal has a large amount of inorganic ash and low carbon content. Gasification using conventional gasification equipment requires coal supplementation and reheating to high temperature, which consumes a lot of energy.

However, this technology still has the following defects: (1) this method decomposes domestic and organic solid waste into combustible gas and charcoal under the condition of heating and oxygen-free, and the direct incineration of combustible gas has not been recycled; (2) this system will Garbage charcoal produced by domestic waste pyrolysis is used as the final product. Due to the low calorific value of garbage charcoal, the market is not smooth, and it contains toxic and harmful substances such as heavy metals. If garbage charcoal is used as the final product, the economic benefits are poor and technology promotion is difficult.

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