Device for preparing biochar by adopting wet process

Abstract

The invention discloses a device for preparing biochar by adopting a wet process. The device comprises a reaction chamber and a cavity cover, wherein an opening is formed at the upper side of the reactor chamber, and the reactor chamber is provided with a pipeline system through which gas / liquid enters and exits; the cavity cover is used for sealing the opening at the upper side of the reaction chamber; and a microwave generation device is connected to the reaction chamber. According to the device disclosed by the invention, a microwave heating technology is combined with wet process carbonization, microwaves are generated by the microwave generation device, a microwave resonant cavity is defined by the reaction chamber and the cavity cover, biomass added to the reaction chamber can be rapidly heated so that the biomass undergoes a carbonization reaction, and therefore the biochar is prepared. Because a microwave endogenous heating mode is adopted in the carbonization process, the device disclosed by the invention has the advantages of no any heat transfer process, high and uniform heating speed, no extra heat consumption, low energy consumption and high efficiency and can be usedfor preparing the biochar by adopting the wet process.

Description

technical field [0001] The invention relates to a device for preparing biochar. Background technique [0002] Biochar is the solid product of biomass pyrolysis under anoxic conditions. The preparation methods of biochar are divided into dry method and wet method. Among them, the dry method, such as fast pyrolysis, medium speed pyrolysis, slow pyrolysis and gasification, etc., requires dry pretreatment of materials, which is more troublesome; wet carbonization is in a closed water environment, with a certain temperature and The carbonization of biomass under pressure has the advantages of high carbon yield, simple preparation process, low energy consumption, and rich functional groups of biochar products. Wet carbonization is an ideal method for preparing biochar. [0003] The wet carbonization device includes various reaction kettles, which usually use thermal energy to directly or indirectly heat the biomass to carbonize it. The carbonization time is generally long, rang...

AI Technical Summary

Problems solved by technology

For example, some new wet biochar preparation devices can overcome the low heat transfer efficiency of the traditional reactor outer jacket heat transfer method by changing the distribution mode and number of heat exchange tubes.

However, the effect is still not good enough, because no matter how the heat exchange tubes are arranged, this way of transferring heat from objects will still cause heat loss, thereby slowing down the production efficiency; in addition, the heat transfer is directional, and it is difficult for the materials to heat up evenly , leading to some fast carbonization and slow carbonization in the space structure, resulting in unsatisfactory finished product quality

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