Device and method for heating and melting rubbish under oxygen-rich condition

Abstract

The invention discloses a device and method for heating and melting rubbish under the oxygen-rich condition. The device comprises a rubbish melting furnace. The rubbish melting furnace is connected with an oxygen supply system. The bottom of the rubbish melting furnace is connected with a cooling device. The oxygen supply system comprises an air separation device, an air feeder and an air preheater which are connected sequentially. A first air blowing opening is formed in the upper portion of the rubbish melting furnace. A second air blowing opening is formed in the bottom of the rubbish melting furnace. Both the first air blowing opening and the second air blowing opening communicate with the air preheater. The oxygen supply system supplies separated oxygen-rich gas to the rubbish melting furnace, and the oxygen-rich gas is used as an oxidizing agent for melting the rubbish. The beneficial effects of the oxygen-rich combustion and melting treatment are used, combustion heat of fuel is used, fly ash of the rubbish is molten at the high temperature, stable glassy state slag is formed after cooling, organic components of Dioxin and the like are destroyed, and most of heavy metals are solidified in the glassy state slag.

Description

technical field [0001] The invention relates to a device and method for heating and melting garbage under oxygen-enriched conditions. It is a garbage melting treatment that completely eliminates dioxins in fly ash and at the same time realizes volume reduction of solid waste. At the same time, oxygen-enriched air is introduced into the melting furnace to reduce the melting temperature while enhancing the fluidity of the slag, increasing the reaction speed, reducing the heat loss of exhaust smoke, and reducing pollution emissions and achieve zero emissions of dioxins. Background technique [0002] With the popularization and application of incineration treatment in the field of municipal waste, medical waste and other solid waste treatment, the amount of fly ash produced by waste incineration is increasing day by day. With the rapid development of my country's economy and the improvement of people's living standards, urban waste has caused increasingly serious ecological env...

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Problems solved by technology

[0005] Chinese patent CN 031478662 "a multi-stage incineration method and system for rotary kiln waste gasification and charcoal ash co-melting" and Chinese patent CN 2015104710856 "a rotary kiln gasification and plasma melting domestic waste graded gasification system" adopt The method of gasification and melting is used to treat garbage, but compared with the use of oxygen-enriched gas, it uses conventional air as a combustion aid, and will consume a large amount of solid carbon or coal as auxiliary fuel to make the furnace reach the melting temperature, increasing the cost. Treatment cost; Chinese patent CN 011070889 "Oxygen Top-blowing Direct Melting Gasification Combustion and Power Generation Technology of Urban Household Garbage" adopts melting and gasification under oxygen-enriched state to treat urban garbage, but it uses oxygen top-blowing to make oxygen only stay in the The upper part of the furnace cannot enter the molten reactants, so it is difficult to ensure the oxygen required for gasification and melting reactions, which reduces the utilization rate of oxygen; Although many pollutants produced in the gasification process have been treated, a large amount of heat generated in the gasification process has not been utilized, and the heat loss is serious, which reduces the energy utilization rate and greatly increases the treatment efficiency. cost

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