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Three-stage heating device, biochar preparation system and preparation method

A heating device and a three-stage technology, which are applied to the three-stage heating device and the biochar preparation system and preparation field, can solve the problems of not effectively solving the program heating and temperature control, unable to obtain industrial application, unfavorable to research and production, and the like, Achieve the effect of rapid gas-liquid-solid three-phase separation, weakening temperature layer excursion, and excellent adsorption effect

Active Publication Date: 2018-10-02
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional biochar preparation equipment and preparation technology are relatively backward, have the disadvantages of high energy consumption and high pollution, and cannot be used in large-scale industrial applications
The earliest preparation device was a rotary kiln, which had poor airtightness, poor charcoal quality, and consumed a lot of heat energy, so it was gradually eliminated
With the further development of the device, a continuous feeding device and a fixed bed device appeared, but the device did not effectively solve the problem of programmed heating and temperature control, and the actual temperature difference was large, which was not conducive to fine research and production

Method used

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  • Three-stage heating device, biochar preparation system and preparation method

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Experimental program
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Effect test

Embodiment 1

[0029] The method for preparing biochar by adopting coconut shell comprises the steps:

[0030] (1) Pretreatment of coconut shells: after washing and drying the coconut shells, dry them in an oven at 80°C to constant weight, and then use an LFP-800 pulverizer to pulverize them to a particle size of 5mm to 10mm;

[0031] (2) Add the crushed coconut shell from the feed end of the variable diameter reactor 2 in the three-stage heating device, start three temperature control devices 11 respectively, set the pyrolysis temperature at 600 ° C, and the heating rate at 20 ° C / min, while adjusting the gas flow control device 12 to set the gas velocity of the pyrolysis gas to 0.5L / min, and the pyrolysis reaction is 1h;

[0032] (3) After the pyrolysis reaction, adjust the cooling rate at 20°C / min to 300°C, set the gas velocity of the pyrolysis gas at 0.2L / min, and after cooling down to room temperature, the generated biochar is directly discharged from the variable-diameter reactor 2 ...

Embodiment 2

[0034] The method for preparing biochar by using rice stalks comprises the following steps:

[0035] (1) Pretreatment of rice straw: After washing and drying the rice straw, dry it in an oven at 70°C to constant weight, and then use an LFP-800 pulverizer to pulverize it to a particle size of 5 mm to 10 mm;

[0036] (2) Add crushed rice stalks from the feeding end of the variable-diameter reactor 2 in the three-stage heating device, start three temperature control devices 11 respectively, set the pyrolysis temperature to 600°C, and heat up at a rate of 15°C / min, while adjusting the gas flow control device 12 to set the gas velocity of the pyrolysis gas to 0.5L / min, and the pyrolysis reaction is 1h;

[0037] (3) After the pyrolysis reaction, adjust the cooling rate at 20°C / min to 300°C, set the gas velocity of the pyrolysis gas at 0.2L / min, and after cooling down to room temperature, the generated biochar is directly discharged from the variable-diameter reactor 2 The bio-oil ...

Embodiment 3

[0040] The method for preparing biochar by adopting apricot shells may further comprise the steps:

[0041] (1) Pretreatment of apricot shells: After washing and drying the apricot shells, dry them in an oven at 60°C to constant weight, and then use an LFP-800 pulverizer to crush them to a particle size of 5mm to 10mm;

[0042] (2) Add the pulverized apricot shells from the feed end of the variable diameter reactor 2 in the three-stage heating device, start three temperature control devices 11 respectively, set the pyrolysis temperature at 600 ° C, and the heating rate at 10 ° C / min, while adjusting the gas flow control device 12 to set the gas velocity of the pyrolysis gas to 0.5L / min, and the pyrolysis reaction is 1h;

[0043] (3) After the pyrolysis reaction, adjust the cooling rate at 20°C / min to 300°C, set the gas velocity of the pyrolysis gas at 0.2L / min, and after cooling down to room temperature, the generated biochar is directly discharged from the variable-diameter...

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Abstract

The invention discloses a three-stage heating device, a biochar preparation system and a preparation method. The three-stage heating device comprises a heating furnace and a variable diameter reactorlocated in the furnace. The biochar preparation system comprises the three-stage heating device, the feeding end of the heating device is connected to a gas supply apparatus, and the discharging end is connected to a separator and a tail gas treatment apparatus in order. The preparation method includes: adding reaction materials into the three-stage heating device, supplying gas through the gas supply apparatus, carrying out pyrolysis reaction to produce biochar, bio-oil and gas, separating the bio-oil and gas by the separator, collecting the bio-oil, and conducting purification treatment on the gas by the tail gas treatment apparatus and then performing discharge. The invention has the following remarkable advantages that: firstly, the three-stage heating device can improve the heat transfer rate and airflow rate; secondly, the biochar preparation system can accurately prepare the biochar with better adsorption effect in terms of adsorption performance, and is environment-friendly andpollution-free; at the same time, the preparation method is simple, easy to operate, and low in energy consumption.

Description

technical field [0001] The invention belongs to the field of biochar preparation, and in particular relates to a three-stage heating device, a biochar preparation system and a preparation method. Background technique [0002] In recent years, water and soil heavy metal pollution has become very serious. Cd pollution in water bodies is mainly caused by human factors, including the discharge of Cd-containing wastewater from electroplating, non-ferrous metal smelting, alloy manufacturing, pigments, and Cd-Ni batteries. Due to the great harm of Cd to the environment and human body, the Cd pollution of soil, sediment, surface water and groundwater has attracted more and more attention. At present, solving the problem of heavy metals in water and soil is a hot spot of current research. According to statistics, 800 million tons of various crop straws are produced every year, of which about 600 million tons are bulk crops (rice, wheat, corn). Therefore, unused crop stalks are pil...

Claims

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Application Information

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IPC IPC(8): C10B53/02C10B57/02B01J20/20B01J20/30B01D53/78B01D53/75
CPCB01D53/75B01D53/78B01J20/20B01J2220/4825C10B53/02C10B57/02Y02E50/10
Inventor 张亚平李飞张会岩
Owner SOUTHEAST UNIV
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