Microwave-assisted vacuum horizontal biochar carbonization equipment

Abstract

The invention discloses a microwave-assisted vacuum horizontal-type biochar carbonizing device. The device includes a carbonizing rotary kiln, on which a material inlet and a material outlet are formed. A plurality of electric-heating apparatuses and microwave generating apparatuses are uniformly disposed in the carbonizing rotary kiln. A vacuum pump, a vacuum valve and a vacuum pressure meter for vacuumizing the carbonizing rotary kiln are disposed on the carbonizing rotary kiln. In the microwave-assisted vacuum horizontal-type biochar carbonizing device, the electric-heating apparatuses and microwave generating apparatuses are uniformly disposed in the carbonizing rotary kiln, wherein the microwave generating apparatuses are used for assisting the electric-heating apparatuses to pyrolyze biomass, so that the carbonizing efficiency of biomass is greatly increased. Through the vacuum pump, a vacuum situation inside the carbonizing rotary kiln during pyrolysis on the biomass is achieved, wherein the vacuum situation can increase effective yield of the biochar.

Description

technical field [0001] The invention relates to the technical field of biomass pyrolysis equipment, in particular to a microwave-assisted vacuum horizontal biochar carbonization equipment used for treating heavy metal-contaminated soil. Background technique [0002] Biochar is obtained by pyrolysis of biomass feedstock. Biochar is almost pure carbon, and it will not disappear for hundreds to thousands of years after being buried in the ground. It is equivalent to sequestering carbon into the soil and helping to slow down global warming. It has aroused widespread interest in biochar all over the world. At present, the main raw materials used to prepare biochar include: wood waste, grass, agricultural by-products, animal manure and municipal sludge. Among them, lignocellulosic biomass is the most important raw material for preparation, and it is also the most studied raw material. [0003] The biochar technology emerging in recent years provides a new solution for soil heavy...

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Problems solved by technology

However, most of these devices have the following problems: (1), most of them are heated by a single external source, or only heated by thermal energy, and the carbonization efficiency is low; (2), most of the equipment is in an oxygen-deficient or low-oxygen state, especially the continuous type It is difficult for the reactor to achieve a truly anaerobic state, so its effective biochar production will be affected, that is, the effective biochar production is not high

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